The present invention relates to a speaker device.
A dynamic speaker device is known as a typical speaker device (for example, see patent literature 1). The dynamic speaker device, for example, as shown in
[Patent literature 1] Publication of unexamined patent application 118-149596 (FIG. 1)
The typical dynamic type speaker device as described above is configured such that the voice coil 611J is disposed opposite to the sound emission side of the diaphragm 21J and the vibration directions of the voice coil 611J and the voice coil bobbin 610J are the same as the vibration direction of the diaphragm 21J, for example, as shown in
Specifically, as shown in
Since the vibration direction of the voice coil bobbin 610J is the same as that of the diaphragm 21J in the conventional speaker device as described above, the total height of the speaker device inevitably becomes large to secure a vibration stroke of the voice coil bobbin 610J, when seeking a large volume sound with large amplitude of vibration of the diaphragm 21J. Thus, it becomes difficult to make a thin device. In other words, the problem is that making a thin device and securing a loud sound are contradictory to each other.
One of the ways to solve this problem is to make the vibration direction of the voice coil different from the vibration direction of the diaphragm, and mechanically direction-convert the vibration of the voice coil and transmit the vibration of the voice coil to the diaphragm. If this is realized, increase of vibration stroke of the voice coil does not directly affect the thickness of the speaker device, and thus a thin speaker device can be realized. In order to realize a thin speaker device by this way, it is important to direction convert the vibration of the voice coil and efficiently transmit the vibration of the voice coil to the diaphragm.
When the vibration direction of the voice coil and the vibration direction of the diaphragm are different, a reaction force with the vibration of the diaphragm exerts in a direction different from the vibration direction of the voice coil. As such, the voice coil easily vibrates in a direction different from the vibration direction of the voice coil. Contact with the voice coil and the configuring member of the magnetic circuit may cause a generation of abnormal noise or damage to voice coil. The vibration of the voice coil cannot be efficiency transmitted to the diaphragm unless the vibration of the voice coil can be restricted in one axis direction.
It is an object of the present invention to overcome the problem described above. That is, an object of the present invention is to provide a thin speaker device capable of emitting loud reproduced sound, efficiently transmit the vibration of the voice coil to the diaphragm by converting the direction of vibration produced by the voice coil, and restrain generation of an abnormal noise and a damage to the voice coil by properly restricting the vibration of the voice coil.
To achieve the above-mentioned object, a speaker device according to the present invention has at least a configuration according to the following independent claim:
A speaker device comprising a diaphragm, a static part vibratably supporting the diaphragm, and a driving part provided at the static part and vibrating the diaphragm upon an audio signal, wherein the driving part includes a voice coil vibrating in a direction different from the diaphragm upon the audio signal inputted, a magnetic circuit including a magnetic gap in which the voice coil is arranged, a rigid vibration direction converter part obliquely disposed with respect to the vibration direction of the voice coil and the diaphragm, and connected with the voice coil and the diaphragm, and a holding part holding the voice coil at the static part, and the holding part restricts the vibration of the voice coil in one axis direction.
a)-(c) are views illustrating a configuration example and an operation of a vibration direction converter part.
a)-(c) are views illustrating a configuration example and an operation of the vibration direction converter part.
a)-(c) are views illustrating a formation example of the vibration direction converter part.
a)-(b) are views illustrating a specific vibration direction converter part.
a)-(b) are views illustrating a specific vibration direction converter part.
a)-(b) are views illustrating another example of the vibration direction converter part.
a)-(c) are views illustrating another example of the vibration direction converter part.
a)-(b) are views illustrating another example of the vibration direction converter part.
a)-(c) are views illustrating a holding part of the speaker device according to an embodiment of the present invention.
a)-(d) are views illustrating a holding part of the speaker device according to an embodiment of the present invention.
a)-(c) are views illustrating a holding part of the speaker device according to an embodiment of the present invention.
a)-(b) are views illustrating a holding part of the speaker device according to an embodiment of the present invention.
a)-(d) are views illustrating a holding part of the speaker device according to an embodiment of the present invention.
a)-(b) are views illustrating a holding part of the speaker device according to an embodiment of the present invention.
a)-(b) are views illustrating a holding part of the speaker device according to an embodiment of the present invention.
a)-(c) are views illustrating a holding part of the speaker device according to an embodiment of the present invention.
a)-(b) are views illustrating an on-board example of the speaker device according to an embodiment of the present invention.
Hereinafter, an embodiment according to the present invention is described with reference to the drawings. The embodiment according to the present invention includes what is shown in the drawings, but is not limited to this alone. In the description hereinafter, the same symbol is applied to the same part as the part that has already been described, and thus a part of the same description may not be repeated.
[Speaker device:
The diaphragm 10 may be formed substantially in a rectangular shape, a circular shape, an ellipsoidal shape or other shapes in the plan view. Further, the cross-sectional shape of the diaphragm 10 may be formed in a prescribed shape, for example, such as a tabular shape, a dome shape, a cone shape, etc. The cross-sectional shape of the diaphragm 10 is planar as shown in the drawings; however, it may be formed in a curved shape. Further, the speaker device 1 may be made thin by making the total height of the diaphragm 10 comparatively small as necessary.
The static part 100 is a collective term for those that support vibrations of the diaphragm 10, the driving part 14, etc., which includes the frame 12 and those that have also a function of the frame 12 such as an after-mentioned yoke, a mounting unit, etc. The static part 100 is, however, not necessarily completely static. The whole static part 100 may vibrate according the effect of vibration of the driving part 14 or other force. The outer periphery part of the diaphragm 10 is supported via an edge 11 by the frame 12 as the static part 100.
The driving part 14 has the magnetic circuit 20, the voice coil 30 and the vibration direction converter part 50. The voice coil 30 vibrates in one axis direction along the magnetic gap 20G of the magnetic circuit 20 and the vibration direction converter part 50 converts the direction of the vibration and transmits the vibration to the diaphragm 10. The voice coil 30 vibrates in X-axis direction and the diaphragm 10 is vibratably arranged in Z-axis direction orthogonal to X-axis direction as shown in the drawings. The vibration direction converter part 50 converts the vibration of the voice coil 30 in X-axis direction into a vibration at obliquely disposed angle of its own displacement, and thus vibrating the diaphragm 10 in Z-axis direction.
The magnetic circuit 20 has a magnet 21 (21A, 21B) and a magnetic pole member (yoke)22 (22A, 22B) such that a plurality of the magnetic gaps 20G are arranged in vibration direction of the voice coil 30, for example, in X-axis direction. In this embodiment, the magnetic pole direction of the magnet 21 (21A, 21B) is set such that magnetic field directions of a pair of the magnetic gaps 20G are opposite to each other (±Z-axis direction). The voice coil 30 made up of a wound conducting member is arranged such that currents flow in directions opposite to each other (±Y-axis direction) in the magnetic gap 20G having magnetic fields in directions opposite to each other. Thereby, a driving force (Lorentz force) may be developed in the voice coil 30 in directions (±X-axis directions) along the magnetic gap 20G. Relationship of arrangement between the magnet 21 and the magnetic pole member (yoke) 22 is not limited to the example shown in the drawings.
The voice coil 30 is formed by winding the conducting wire (conducting member) to which the audio signal is inputted. The voice coil 30 in itself is vibratably arranged at the static part 100 or is vibratably arranged at the static part 100 via the voice coil support part 40. The voice coil support part 40 may be formed, for example, with a tabular insulating member, and the voice coil 30 is supported on the surface of or inside the voice coil support part 40. Since the voice coil support part 40 is formed, for example, with the tabular insulating member, rigidity (bending rigidity and torsional rigidity included) may be added to the voice coil 30 as a whole. A tabular insulating member as the voice coil support part 40 has a plurality of conducting layers at the outside of a conducting wire. This conducting layer (voice coil lead wire) 32 (see
As shown in the drawings, the voice coil 30 and the voice coil support part 40 are formed in a tabular shape, but they are not limited to this form and may be formed in a tubular shape. Further if the voice coil 30 or the voice coil support part 40 supporting the voice coil 30 are formed in a tubular shape, a tabular cover, which enables angle-variable connecting of the vibration direction converter part, may be connected with the end of the vibration direction converter part 50.
The voice coil 30 is held on the static part 100 with a holding part not shown in the drawings. The holding part is configured to vibratably hold the voice coil 30 or the voice coil support part 40 in vibration direction (for example, X-axis direction) with respect to the static part 100 and restrict them not to move in other directions. For example, the holding part is deformable in the vibration direction (for example, X-axis direction) of the voice coil 30. And the holding part may be formed with a curved plate member having rigidity in a direction crossing this vibration direction. Further, the length of the voice coil 30 in the direction orthogonal to the vibration direction of the voice coil thereof may be comparatively long with respect to the length of the voice coil 30 in the vibration direction of the voice coil so that a comparatively large driving force may be produced when driving a speaker.
The vibration direction converter part 50 includes a rigid link part 51 angle-variably and obliquely disposed between the voice coil 30 or the voice coil support part 40 and the diaphragm 10, and a hinge part 52, which is formed at both ends of the link part 51 and is a fulcrum for angle change of the vibration direction converter part 50. The connecting part 53 of the vibration direction converter part 50 is connected to an attaching counterpart 200 including the diaphragm 10, or the voice coil 30, or other member than the diaphragm 10 or the voice coil 30 with a coupling member including a joining member such as an adhesive or a double-faced tape, and a fastener member such as a screw, etc. The hinge part 52 is arranged in the proximity of the attaching counterpart 200. The connecting portion 53 (53A) at the end of the vibration direction converter part 50 is connected to the voice coil 30 or the voice coil support part 40 via a connecting part 60 as shown in the drawings. However, the connecting part 53(53A) may be directly connected without the connecting part 60. The connecting part 60 is formed between the end of the vibration direction converter part 50 on the voice coil side and the end of the voice coil 30 or the voice coil support part 40 on the side of vibration direction converter part, and thereby both ends are connected spaced apart in the vibration direction. Further, the connecting part 60 absorbs the thickness of the magnetic circuit, and thus allowing the speaker device to be made thin.
Further, a contact avoiding part 70 avoiding contact with the hinge part 52 is formed on the surface side of the attaching counterpart 200 in the proximity of the hinge part 52 of the vibration direction converter part 50. This contact avoiding part 70 also functions as a joining member restraining part, which restrains the joining member joining the vibration direction converter part 50 and the attaching counterpart 200. The contact avoiding part 70 is, for example, a concave portion, a notch part, a groove part, etc., which is formed in a concave shape along the hinge part 52. Accordingly, a predetermined space is formed between the hinge part 52 and the surface of the attaching counterpart 200 arranged near the hinge part 52 and thus preventing the adhesive material provided between the vibration direction converter part 50 and the attaching counterpart 200 from affecting the hinge part 52. As shown in the drawings, the notch part 71 as the contact avoiding part 70 is formed at the connecting part 60, which is the attaching counterpart 200, such that the notch part 71 is arranged in the proximity of the hinge part 52 (52A), while the concave portion 72 as the contact avoiding part 70 is formed at the diaphragm 10, such that the concave portion 72 is arranged in the proximity of the hinge part 52 (52B). As such, when the connecting part 53 of the vibration direction converter part 50 and the connecting part 60 or the end face of the diaphragm 10 are joined with the joining member such as adhesive, double-faced tape, etc., the adhesive or the end of the double-faced tape running off toward the hinge part 52 enters into the notch part 71 or the concave portion 72, and thus the adhesive or the double-faced tape is prevented from contacting and adhering to the hinge part 52.
In the above-mentioned speaker device 1, when an audio signal SS as an electric signal is inputted to the voice coil 30 of the driving part 14 as shown in
According to the speaker device 1 as described above, since the vibration direction of the voice coil 30 and the vibration direction of the diaphragm 10 can be made different from each other with the vibration direction converter part 50, the thickness on the rear side of the diaphragm 10 may be made thin compared to a case that the voice coil 30 is vibrated in the vibration direction of the diaphragm 10. As such, a thin speaker device, which may reproduce with a high sound pressure at a low frequency range, may be obtained.
Further, since the direction of the vibration produced by the voice coil 30 is converted by the vibration converter part 50 and the vibration is transmitted to the diaphragm 10, the thickness in sound emission direction of the speaker device 1 (total height of the speaker device) is not increased even if the amplitude of vibration of the diaphragm 10 is increased by increasing the amplitude of vibration of the voice coil 30. As such, a thin speaker device, which may emit a loud reproduced sound, may be realized.
Further, when the connecting part 53 of the direction converter part 50 and the attaching counterpart 200 are connected to each other by using an adhesive as an joining member, if the adhesive spreads out and runs off toward the hinge part 52 due to the join, and adheres to the hinge part 52, the hinge part 52 may be hardened and lose mobility. Also, when the double-faced tape is used as the joining member, if the end of the double-faced tape runs off toward the hinge part 52 and the double-faced tape adheres to the hinge part 52, the hinge part 52 may be hardened and lose mobility. In addition, the hinge part 52, which is adhered to and hardened by the adhesive, the end of the double-faced tape, etc. adhered thereto, may be subject to fracture by the repetition of bending, folding or rotational motion. If the hinge part 52 fractures as described above, the part to which the adhesive or the end of the double-faced tape adheres may repeatedly contact with and separate from the diaphragm 10, the voice coil 30 or the attaching counterpart 200 as other members, etc., and thus an abnormal noise (contact sound) may be generated each time. On the other hand, if the applied volume of the adhesive or the joining area by the double-faced tape is limited such that the adhesive or the double-faced tape does not run off and adhere to the hinge part 52, the coupling force between the vibration direction converter part 50 and the attaching counterpart 200 may be reduced, then detachment, etc. may occur at the end face, causing abnormal noise, or if a total detachment occurs, the speaker may eventually be fractured. Furthermore, since the hinge part 52 is arranged near the attaching counterpart 200, the hinge part 52 may contact the attaching counterpart 200. Therefore, the hinge part 52 damages, or there is a case that the vibration direction converter part 50 cannot bend, fold or rotate with respect to the attaching counterpart 200. However, in this speaker device, since the contact avoiding part 70 is formed on the surface side of the attaching counterpart 200 in proximity of the hinge part 52, it is possible to prevent the attaching counterpart 200 from contacting the hinge part 52 and restrain the generation of abnormal noise, etc. due to the contact. Further, even if the joining member such as the adhesive, double-faced tape, etc., which is used for coupling the connecting part 53 of the vibration direction converter part 50 and the attaching counterpart 200, runs off, the joining member enters into the contact avoiding part 70 that also functions as a joining member restraining part, and thus it is possible to restrain adherence of the joining member to the hinge part 52 causing hindrance to mobility thereof. As such, the function of the hinge part 52 may be maintained while the coupling force between the vibration direction converter part 50 and the attaching counterpart 200 is maintained large. Since the vibration direction converter part 50 securely bends, folds or rotates with respect to the attaching counterpart 200, contact of the hinge part 52 to the attaching counterpart 200, generation of the abnormal noise, etc. due to fracture may be restrained.
In the embodiment shown in
a) shows that the link part 51 is in the middle position of the vibration. The link part 51 is obliquely disposed between the voice coil 30 (or voice coil support part 40) and the diaphragm 10 at an angle θ0. Meanwhile, the hinge part 52B on the side of the diaphragm 10 is arranged at the position Z0 apart from the voice coil 30 by distance H0 in the vibration direction of the diaphragm 10. The vibration direction of the voice coil 30 (or voice coil support part 40) is restricted such that it may vibrate in one axis direction (for example, X-axis direction), while the vibration direction of the diaphragm 10 is restricted such that it may vibrate in a direction (for example, Z-axis direction) different from the vibration direction of the voice coil 30.
As shown in
As shown in
As such, the vibration direction converter part 50, including the link part 51 and the hinge part 52 (52A, 52B), converts vibration of the voice coil 30 to the change in the angle of the link part 51 obliquely disposed and transmits it to the diaphragm 10, and thus vibrating the diaphragm 10 in a direction different from the vibration direction of the voice coil 30.
The vibration direction converter part 50 has a function that the link part 51 can angle-convert by receiving reaction force from a static part 100 such as the frame 12 positioned on the opposite side of the diaphragm. Specifically, the vibration direction converter part 50 includes a first link part 51A having one end on the side of the voice coil 30 as a hinge part 52A while another end on the side of the diaphragm 10 as a hinge part 52B and a second link part 51B having one end as a hinge part 52C to the middle part of the first link part 51A while another end as a hinge part 52D to the static part 100, and the first link part 51A and the second link part 51B are obliquely disposed in different directions with respect to the vibration direction of the voice coil 30. More specifically, the vibration direction converter part 50 includes a first link part 51A having one end on the side of the voice coil 30 as a first hinge part 52A while another end on the side of the diaphragm 10 as a second hinge part 52B and a second link part 51B having one end as a third hinge part 52C to the middle part of the first link part 51A while another end as a fourth hinge part 52D to the static part 100, and the first hinge part 52A, the second hinge part 52B and the fourth hinge part 52D are located on the circumference of a circle with a diameter of substantially the same length as the first link part 51A, having the third hinge part 52C as the center.
In the vibration direction converter part 50, the hinge part 52 D, supported by the static part 100 (or frame 12), is only the hinge part that does not change position, and thus providing reaction force from the static part 100 for the link part 51. Accordingly, when the voice coil 30 (or the voice coil support part 40) moves from the reference position X0 by ΔX1 in the X-axis direction, angles of the first link part 51A and the second link part 51B that are obliquely disposed in different directions are increased by substantially the same angle as shown in
Length a of a link part from the hinge part 52A to the hinge part 52C, a length b of the link part from the hinge part 52C to the hinge part 52B and the length c of a link part from the hinge part 52C to the hinge part 52D are configured to be substantially the same as each other, and thereby the hinge part 52A and the hinge part 52D are preferably arranged substantially in parallel with the moving direction of the voice coil 30. This link body is well known as a “Scott Russell linkage” where the hinge parts 52A, 52B and 52D are located on the circumference of a circle with the length of the first link part 51A (a+b=2a) as the diameter and the hinge part 52C as the center of the circle. In particular, the angle defined by the line passing through the hinge part 52A and the hinge part 52D and the line passing through the hinge part 52B and the hinge part 52D becomes a right angle. As such, when the voice coil 30 is moved in the X-axis direction, the hinge part 52B between the first link part 51A and the diaphragm 10 moves in the Z-axis direction that is perpendicular to the X-axis, and thus it is possible to convert the vibration direction of the voice coil 30 to its orthogonal direction and transmit the vibration to the diaphragm 10.
In the vibration direction converter part 50, the link part 51, the hinge parts 52A and 52B, the first and second connecting parts 53A and 53B are integrally formed, and the hinge parts 52A and 52B are formed with a bendable continuous member continuing between the parts of both sides over the hinge parts 52A and 52B. This continuous member may be a member configuring the link part 51 and the first and the second connecting part 53A and 53B as a whole, or may be a member configuring the link part 51 and a part of the first and second connecting parts 53A and 53B. Provided with this second connecting part 53B, the link part 51 may support the diaphragm 10 over a wide range, and thereby it is possible to vibrate the diaphragm 10 in the same phase. The term “fold” includes “bend” in its conceptual scope.
If the vibration direction converter part 50 is formed with a plate shape member, the hinge part 52 is linearly formed extended in a width direction as shown in
Further, the change in thickness of the hinge part 52 and the link part 51 is formed on a slant face, and the slant faces 51t and 53t, facing the ends of the parts of both sides over the hinge part 52, are formed. As such, when the link part 51 is angle-varied, interference to the angle variation by thickness of the link part 51 may be restrained.
Further, a concave portion or notch part 71, which acts as a contact avoiding part 70, is formed at the end of the connecting part 60 that is an attaching counterpart 200 arranged near the hinge part 52A, such that a space is formed between the hinge part 52A and the connecting part 60 as shown in
In an example shown in
In an example shown in
The continuous member 50P is preferably configured to have strength and durability durable against repeated bending of the hinge part 52 when the speaker device is driven, and have flexibility making little noise when bending is repeated. According to one embodiment, the continuous member 50P may be formed with a woven or an unwoven material made of high-strength fiber. As an example of the woven material, plain weave with uniform material, plain weave having different warp and weft material threads, plain weave with alternately changed thread material, plain weave with twisted union yarn and plain weave with paralleled yarn. Other than plain weaves, there may be applied triaxial and quadraxial woven fabrics, triaxial and quadraxial continuous non-woven fabric of glued layer, knitting, fabric with paralleled yarn in one direction, etc.
When the high-strength fiber is applied partially or as a whole, sufficient strength against vibration of the voice coil 30 or the voice coil support part 40 may be achieved by arranging the high-strength fiber in the vibration direction of the voice coil support part 40. When applying both the warp and the weft thread as the high-strength fiber, durability may be improved with a uniform tensile force given to the warp and the weft thread by inclining both fiber directions by 45° with respect to the vibration direction of the voice coil support part 40. As the high-strength fiber, aramid fiber, carbon fiber, glass fiber, etc. may be used. Further, a damping material may be applied to adjust characteristic such as bending stress and rigidity of the continuous member.
As the rigid member 50Q, thermoplastic resin, thermosetting resin, metal, paper, etc., which are light weight, easy to mold and having rigidity after hardening, may preferably be used. The vibration direction converter part 50 may be configured by joining the rigid member 50Q, which is molded in a plate shape, to the surface of the continuous member 50P other than the part of the hinge part 52 by using adhesive as a joining material. Further, if thermosetting resin is used as the rigid member 50Q, the vibration direction converter part 50 may be configured by impregnating partially the link part 51 or the connecting part 53 of the fibrous continuous member 50P with resin and then hardening it. Further, if resin or metal is used as the rigid member 50Q, the continuous member 50P and the rigid member 50Q may be integrated at the link part 51 and the connecting part 53 by using insert molding.
The above-mentioned technology concerning the integral forming is described in US20050127233 (Publication No. US2005/253298) filed in the US on May 12, 2005 and US20050128232 (Publication No. US2005/253299) filed in the US on May 13, 2005, which is incorporated here in the present application.
In the speaker device 1A shown in
According to the drawings, the first connecting part 53A is connected to the end of the voice coil support part 40 directly or via the connecting part 60, the second coupling part 53B is directly connected to the diaphragm 10 and the static connecting part 3C is coupled to the bottom portion 12A of the frame 12 that is the static part 100. A concave portion or a notch part 73, which acts as a contact avoiding part 70, is formed at the bottom portion 12A of the frame 12 that is an attaching counterpart 200 arranged near the hinge part 52D, such that a space is formed between the hinge part 52D and the bottom portion 12A of the frame 12. In an example shown in the drawings, the notch part is formed. The first link part 51A and the second link part 51B are obliquely disposed in different directions with respect to the vibration direction (X-axis direction) of the voice coil support part 40 and the static part 100 is provided on the opposite side of the diaphragm 10 with respect to the vibration direction converter part 50. In the example shown in the drawings, although the static part 100 is formed with the bottom portion 12A of the frame 12, a yoke 22A of a magnetic circuit 20 may be the static part 100 instead of the bottom portion 12A of the frame 12 by extending the yoke 22A of the magnetic circuit 20 to the position under the vibration direction converter part 50.
As shown in
The speaker device 1B shown in
The link bodies 50L(R) and 50L(L) configure the vibration direction converter part 50 such that a pair of the first link parts 51A, a pair of the second link parts 51B, a pair of the first connecting parts 53A, the second connecting part 53B and the static connecting part 53C, which are disposed opposite to each other, are integrally formed. A pair of the first connecting parts 53A are connected to the voice coil support part 40 respectively, the second connecting part 53B is connected to the diaphragm 10, and the static connecting part 53C is connected to the bottom portion 12A of the frame 12.
As shown in
As shown in
As shown in
As shown in
Further, each hinge part and the slant faces 51t and 53t at both sides thereof may be formed at the same time as forming the rigid member 50Q with the resin material. It is preferable that a cross-sectional V-shape groove or a concave portion is formed preliminarily in a die, which is used to mold the rigid member 50Q.
The vibration direction converter part 50 includes a pair of first link parts 51A(R) and 51A(L) having a hinge part 52A(R) and 52A(L) to a first connecting part 53A (R) and 53A (L) at one end, and having a hinge part 52B(R) and 52B(L) to a second connecting part 53B at another end. Also, the vibration direction converter part 50 includes a pair of second link parts 51B(R) and 51B(L) having hinge parts 52C(R) and 52C(L) to the middle parts of the first link parts 51A(R) and 51A(L) at one end, and having hinge parts 52D(R) and 52D(L) to the static connecting part 53C at another end. As described above, the first connecting part 53A is connected to the voice coil 30 or the voice coil support part 40 directly or via the connecting part 60 as other member, while the second connecting part 53B is connected to the diaphragm 10 and the static connecting part 53C is connected to the bottom portion 12A of the frame 12 that is the static part 100, the yoke 22, etc. forming the magnetic circuit 20.
Further the vibration direction converter part 50 includes a pair of third link parts 51C(R) and 51C(L) having hinge parts 52E(R) and 52E(L) at one end to a pair of the connecting parts 53D(R) and 53D(L) integrally extending from the first connecting part 53A (R) and 53A (L), and having hinge parts 52F (R) and 52F (L) at another end to a connecting part 53E that is integral with the second connecting part 53B.
Further, the first link part 51A(R) and the third link part 51C(R), the first link part 51A(L) and the third link part 51C(L), the second link part 51B(R) and the third link part 51C(L), and the second link part 51B(L) and the third link part 51C(R) form parallel links respectively.
This link body 50L of the vibration direction converter part 50 substantially includes a function combining the link body of the embodiment shown in
As shown in the drawings, the second connecting part 53B arranged near the hinge parts 52F (R) and 52F (L) and a pair of the connecting part 53D(R) and 53D(L) arranged near the hinge parts 52A(R) and 52A(L) form concave portions 76 as the contact avoiding part 70, such that a space is formed between each hinge part and connecting part.
An operation of the vibration direction converter part 50 is described with reference to
Similarly, when the hinge parts 52A(R) and 52A(L) is moved from the reference position X0 to X2 in the X-axis direction, the second connecting part 53B and the connecting part 53E integrally with the second connecting part 53B are moved down keeping a parallel state by the parallel link body, while angles of the first link parts 51A(R) and 51A(L) and the third link parts 51C(R) and 51C(L), which configure a parallel link, are varied as they are laid. Since the hinge parts 52D(R) and 52D(L) are supported by the static part, they receives a reaction force from the static part and angle variation of the first link parts 51A(R) and 51A(L) and the third link parts 51C(R) and 51C(L) is securely produced and the displacement of the hinge parts 52A(R) and 52A(L) from the position X0 to X2 is securely converted to the displacement of the diaphragm 10 from the position Z0 to Z2.
According to this vibration direction converter part 50, the vibration in the X-axis direction of one voice coil support part 40 is converted to the vibrations in the Z-axis direction of the hinge parts 52B(R) and 52B(L), 52F (R) and 52F (L), and the second connecting part 53B, which vibrate substantially in the same phase and the same amplitude. As such, since the diaphragm 10 is supported over a large area and given the vibration that has substantially the same phase and the same amplitude, the vibration of the voice coil support part 40 may be transmitted substantially in the same phase to the planar diaphragm 10 with large area.
As shown in
With link parts configured with a single sheet-shape component as described above, the diaphragm 10 can be vibrated and supported by a face, and thereby the whole diaphragm 10 can be vibrated substantially in the same phase and divided vibration may be restrained.
Further, as shown in
A method of configuring this vibration direction converter part 50 is described with reference to
In this embodiment, the opening 502A, formed in another sheet-shape component 502 corresponding to the second link parts 51B(R) and 51B(L) and the static connecting part 53C of one sheet-shape component 501, is formed so as to expand inward from ends of another sheet-shape component 502. This configuration may prevent the second link parts 51B(R) and 51B(L), and the static connecting part 53C from contacting another sheet-shape component 502, and thus a smooth movement of the link body may be performed.
The two sheet-shape components 501 and 502, which are formed with the continuous member 50P and the rigid member 50Q, are applied with their continuous members 50P, 50P face-to-face as shown in
Further, the slant face as shown in
In another configuration example, the above-mentioned sheet-shape component 501 and the sheet-shape component 502 are integrally formed with the sheet-shape component 502 connected to the end of the sheet-shape component 501 as shown in
Further, when forming each hinge part and the slant faces 51t and 53t at the both sides thereof, the rigid member 50Q may be formed with the resin material and molded at the same time. It is preferable that a cross-sectional V-shape groove or a concave portion is preliminarily formed in a die, which is used to mold the rigid member 50Q.
In the vibration direction converter part 50 shown in
Further, in the vibration direction converter part 50 shown in
According to this speaker device 1, 1A, 1B, when an audio signal SS is inputted, the voice coil support part 40 vibrates along the magnetic gap 20G formed in a direction different from the vibration direction admissible for the diaphragm 10, and this vibration is direction-converted by the vibration direction converter part 50 and transmitted to the diaphragm 10, and thereby vibrating the diaphragm 10 to emit a sound in the sound emission direction SD corresponding to the audio signal SS.
Since the direction of the magnetic gap 20G is configured to cross the vibration direction of the diaphragm 10 and the thickness direction of the speaker device 1, 1A, 1B, increasing the driving force of the magnetic circuit 20 or the vibration of the voice coil 30 does not directly affect the size of the speaker device 1, 1A, 1B in the thickness direction (Z-axis direction). Accordingly, it is possible to make the speaker device 1, 1A, 1B thin while pursuing reproduced a louder sound.
Further, since the vibration direction converter part 50 converts the vibration direction of the voice coil support part 40 and transmits the vibration to the diaphragm 10 through the mechanical link body, transmission efficiency of vibration is high. In particular, in the speaker device 1, 1A, 1B shown in
Further, in the speaker device 1, 1A, 1B shown in
More particularly, a bottom portion 61 of the connecting part 60 is configured to slide over the bottom portion 12A of the frame 12 or the static part 100 with a predetermined distance therefrom, and thereby vibration of the voice coil support part 40 may be stabilized. Further, the end of the vibration direction converter part 50 can be linearly moved, and thus the end of the vibration direction converter part 50 connected to the diaphragm 10 can be securely and stably moved.
The vibration direction converter part 50 shown in
With this holding part 15, it is possible to prevent the voice coil 30 vibrating in the vibration direction of the diaphragm from contacting the configuring member of the magnetic circuit (plate, yoke, etc.) or the frame and restrain a trouble such as generation of an abnormal noise due to the contact. In order to restrict the vibration of the voice coil 30 in one axis direction as described above, the holding part 15 is preferably elastically deformable in an allowable vibration direction and has rigidity in other directions.
According to the example shown in
The curved portion W, Wa of the holding part 15, which has a concavo-convex cross-sectional shape in the vibration direction of the voice coil 30 (X-axis direction), have a constant form in the vibration direction of the diaphragm 10 (Z-axis direction). More specifically, no matter how Y1-Y1 cross sectional axis is displaced in a parallel fashion, a cross-sectional view shown in
The holding part 15 includes the curved portion W as a first curved portion and the curved portion Wa as a second curved portion, which is formed continuing to the first curved portion W. The radius of curvature of the second curved portion Wa is smaller than the radius of curvature of the first curved portion W. Further, the projection directions of the first curved portion W and the second curved portion Wa are opposite each other. A plurality of the curved portions W, Wa are concave and convex in the vibration direction (X-axis direction) of the voice coil 30. Therefore the holding part 15 has high compliance with respect to the vibration in the vibration direction of the voice coil 30. As such, a relationship between the driving force of the voice coil 30 and the displacement of the voice coil 30 can be made linear within a practical vibration range of the voice coil 30. Further, provided with the second curved portion Wa having the radius of curvature smaller than that of the first curved portion W, torsional rigidity of the holding part 15 may be increased. As such, generation of rolling of the voice coil 30 (vibration of the voice coil in the vibration direction of the diaphragm 10) may be restrained.
According to the example shown in the drawing, the holding part 15 has a tabular portion F having a linear cross-sectional shape at least at its end, and the tabular portion F is formed continuing to the curved portion Wa. The tabular portion F is provided to fix the holding part 15 on the side of voice coil or on the side of the static part. The holding part 15 may be stably fixed and supported by providing with the tabular portion F that is difficult to deform and deforming mainly the curved portion W, Wa with respect to the vibration of the voice coil 30.
For example, as shown in
As shown in
And, the plurality of the configuring members 151 and 152 are arranged opposite each other, and a space surrounded by the configuring members 151 and 152 is formed between the configuring members 151 and 152. Torsional rigidity of the holding part 15 is increased by this space, and thus generation of a rolling phenomenon (vibration of the voice coil 30 in the vibration direction of the diaphragm 10) may be restrained. Further, the holding part 15 including the configuring members 151 and 152 has substantially a line-symmetrical shape. With this line-symmetrical shape of the configuring members 151 and 152, symmetry of the voice coil 30 in forward and backward vibrations may be secured. Further, when the configuring members 151 and 152 are made asymmetrical, a balance of the voice coil 30 in forward and backward vibrations may be adjustable by making larger or smaller vibrations in one side than in the other side with reference to the neutral position. As shown in
The voice coil 30 or the voice coil support part 40 includes an end edge 40f extending in the direction crossing the vibration direction of the voice coil 30 in the one end portion and the other end portion of the voice coil 30 in the vibration direction, and the end edge 40f is supported by the static part via the holding part 15. More specifically, the end edge 40f is connected to the connecting part 60, and the tabular portion F in the side of one end portion of the holding part 15 is connected to both right and left end portions of the connecting part 60 and the tabular portion F in the side of the other end portion of the holding part 15 is supported to the static part.
The speaker device includes an attachment unit 16 arranging the voice coil 30 or the voice coil support part 40 at a prescribed position with respect to the static part. One end portion of the holding part 15 (tabular portion F) is connected to the end edge 40f of the voice coil 30 or the voice coil support part 40 directly or via other member, while the other end portion (tabular portion F) is connected to the attachment unit 16 directly or via other member. More specifically, the tabular portion F in the side of one end of the holding part 15 is connected to the end edge 40f via the connecting part 60, and the tabular portion F in the side of the other end portion of the holding part 15 is connected to a connecting end 16f of the attachment unit 16. By using this attachment unit 16, steps of attaching the voice coil 30 to the static part via the holding part 15 may be simplified.
The holding part 15 (the second holding part 15B), holding at the static part the end edge 40f1 of the voice coil 30 or the voice coil support part 40 in the opposite side of the vibration direction converter part, includes a pair of the curved portions W, W, and is an integral part arranged in the direction that the end edge 40f1 of the voice coil 30 or the voice coil support part 40 extends. Both end portions (tabular portion F) of the second holding part 15B as the integral part are connected to the end edge 40f1 of the voice coil 30 or the voice coil support part 40, and a part of the second holding part 15B as the integral part (tabular portion F) as the integral part between a pair of the curved portions W, W is connected to the attachment unit 16.
The second holding part 15B includes a pair of the curved portions W, W as the first curved portion W and the second curved portion Wa whose outer shape is smaller than the first curved portion W. The second curved portion Wa is continuously formed from the first curved portion W and the projection directions of the first curved portion W and the second curved portion Wa are opposite each other.
A reinforcing member G is attached to the second holding part 15B as the integral part. The reinforcing member G is a member causing an internal loss with respect with the second holding part 15B as the integral part. With this reinforcing member G attached to the holding part, generation of a sound wave due to vibration of the holding partmay be restrained. In particular, generation of a sound wave due to resonance of the holding part 15 may be restrained. Further, with this reinforcing member G formed in a stacking structure, a function of damping vibration of the holding part 15 may be added. Further, with this reinforcing member G attached to a portion subject to fracture due to deformation of the holding part 15, fracture may be restrained. This reinforcing member G may be formed with a fiber member such as unwoven fabric or fabric, resin member such as rubber or polyurethane resin, or elastic member such as resin member having a foamed structure.
The second holding part 15B as the integral part and the attachment unit 16 are connected via adhesive resin. The tabular portions F, F at both right and left end portions of the second holding part 15B are connected to contacting parts 40g, 40g at both right and left end portions of the end edge 40f1 via connecting parts 40g1, 40g1 having holes 40g2 respectively, and the tabular portion F in the center of the second holding part 15B is connected to the connecting end portion 16f1 of the attachment unit 16. The end edge 40f1 of the voice coil support part 40 in the opposite side of the vibration direction converter part of the voice coil support part 40 is formed in a concave shape with respect to the voice coil 30, and the voice coil support part 40 is formed in a planar shape restraining contact with the attachment unit 16, when the voice coil supporting part 40 is vibrated due to vibration of the voice coil 30. More specifically, in the voice coil support part 40, a comparatively large interval is formed between the connecting end portion 16f1 of the attachment unit 16 and the end edge 40f1 of the voice coil support part 40, and the voice coil support part 40 has a planar shape projecting toward the second holding part 15B as coming near the both right and left flat parts F of the second holding part 15B. Holes, in which contacting parts 40g of the right and left end portions of the other end edge 40f1 in the voice coil support part 40 are inserted, are formed in the flat parts F at both right and left end portions of the second holding part 15B.
Further, by forming the holding part 15, for example, substantially in a symmetrical shape, while the two configuring members 151 and 152 having substantially the same shape are disposed opposite each other, performance of the holding part 15 (stiffness symmetry during the vibration stroke) may be improved. Here, “stiffness symmetry during the vibration stroke” means symmetry of the stiffness curve when a voice coil moves in one direction and the stiffness curve when the voice coil moves in another direction.
The first holding part 15A has a connecting face F1 in the side of one end portion connected to the terminal part 81, and a connecting face F2 in the side of another end portion connected to the connect terminal part 42 of the voice coil lead wire 32. The terminal part 81 connects a pair of the first holding part 15A in the side of one end electrically to a wiring 82 (external), and an audio signal inputted from the wiring 82 is supplied to a voice coil lead wire 32 via the terminal part 81 and the first holding part 15A. The terminal part 81 is a conducting member formed in a rod shape. The terminal part 81 has a positioning hole. And the terminal part 81 is positioned at a specified location of the static part 100 with this positioning hole inserted by a positioning projection 111 provided at the static part 100. Further, a part of the terminal part 81 is insulated, and a surface of conducting member in a region where connecting with the connecting face F1 of the first holding part 15A is exposed so as to be electrically connectable to the first holding part 15A. Further, the terminal part 81 may be electrically connected to the connecting face F1 of the holding part 15 by constructing the terminal part 81 with an insulating member such as resin member, etc. and providing a conducting member on this insulating member.
When configuring the holding part 15 with a plurality of configuring members, one configuring member may be made of a rigid material and another configuring member may be made of a material causing an internal loss. As a material causing an internal loss, resin material such as rubber, polyurethane resin, etc. or a resin member having a foamed structure, are included. By configuring the holding part with a plurality of configuring members different in property, performance of vibration of the holding part may be improved. Further, since the resonant frequency is different among the configuring members, generation of resonance may be restrained at the joining face where a plurality of configuring members are joined, and thus generation of abnormal noise may be restrained. As this holding part 15, for example, the second holding part 15B to which the above-mentioned reinforcing member G is attached, is included. Further, not limited to the above embodiment, the second holding part 15B may be connected to the attachment unit 16, sandwiching another configuring member causing an internal loss between the second holding part 15B and the attachment unit 16.
Further, a resin member such as rubber with a metal member arranged inside may be used as a plurality of configuring members of the holding part 15, or different metal members may be used as the plurality of configuring members. There is no particular limit to the configuration. In the former example, internal loss may preferably be generated since a metal member is covered with a resin member. In the latter example, since the resonance frequency is different from each other, generation of resonance may be restrained at a joining face where a plurality of metal members are joined.
As shown in
Any dampers shown in the drawings are formed with a plurality of the configuring members 151 and 152. One configuring member 151 includes at least a first curved portion Wa1. Another configuring member 152 includes a first curved portion Wal, a second curved portion Wa3 and a third curved portion Wa4.
In the example shown in
As shown in each example, performance of damper (stiffness symmetry during the vibration stroke) may be adjustable by changing the vertical position of the inner periphery part of the configuring member 152. Here, “stiffness symmetry during the vibration stroke” means symmetry of the stiffness curve when a voice coil vibrates in one direction and the stiffness curve when the voice coil vibrates in another direction.
The “stiffness symmetry during the vibration stroke” is improved when the position of the inner periphery part of the configuring member 152 is elevated on the condition that the configuring member 152 is connected above the configuring member 151 and the configuring member 152 is projected upward. If the position of the inner periphery part of the configuring member 152 is lowered, stiffness asymmetry of vertical vibration (asymmetry between the stiffness curve when a voice coil vibrates in one direction and the stiffness curve when the voice coil vibrates in another direction) becomes large. In the example shown in the drawing, although one configuring member 151 is arranged in the side of the vibration direction converter part 50 and the other configuring member 152 is arranged in the side of the voice coil 30, one configuring member 151 may be arranged in the side of the voice coil 30 and the other configuring member 152 may be arranged in the side of the vibration direction converter part 50 as necessary.
According to the example shown in
Since the diaphragm 10 has rigidity (bending rigidity included) in the vibration direction of the diaphragm, generation of deflection, etc. of the diaphragm 10 may be restrained, and thus generation of difference in phase between sound waves, deterioration of acoustic characteristic, etc. may be restrained. Further, with the curved portion 10A of the diaphragm 10 formed between a pair of the hinges 52B that is formed between the vibration direction converter part 50 and the diaphragm 10, generation of deflection may be restrained.
Further, the diaphragm 10 is formed substantially in a rectangular shape including a short axis extending in the vibration direction of the voice coil 30 and a long axis extending along the direction orthogonal to the vibration direction of the voice coil 30, a reinforcing part (not shown) may be formed in the direction of the long axis or the short axis. The reinforcing part includes a groove part, having, for example, V-shaped cross-section, which is formed linearly, annularly or in a lattice shape in the front face or rear face of the diaphragm 10. For example, filling material such as damping material may be applied to inside of the groove part. As such, with the groove part filled by the filling material, rigidity (bending rigidity included) of the diaphragm 10 may be increased and the peak and dip of sound pressure frequency characteristic of a speaker may be lowered. Further, as another example of the reinforcing part, for example, fiber member made of unwoven fabrics (not shown), etc. may be applied instead of forming the groove part. With the reinforcing part constructed with the fiber member as described above, rigidity (bending rigidity) of the diaphragm 10 may be increased, and thus generation of deformation such as deflection in the diaphragm 10 due to vibration or air resistance transmitted from the vibration direction converter part when the diaphragm 10 vibrates, may be restrained. Further, provided with the reinforcing part, an internal loss of the diaphragm 10 may be improved.
Further, the diaphragm 10 is formed with a first layer constructed with foamed resin including acrylic resin, etc. and a second layer including a fiber member such as a glass fiber, configuring a stacking structure in which the first layer is sandwiched between a pair of the second layers. As a forming material of the diaphragm 10, for example, resin material, metal material, paper material, fiber material, ceramics material, compound material, etc. may be adopted.
The edge 11, vibratably supporting the diaphragm 10 at the frame 12 as the static part 100, is arranged between the diaphragm 10 and the frame 12, and the inner periphery part supports the outer periphery part of the diaphragm 10 while the outer periphery part is connected to the frame 12 directly or via other member, and thus the diaphragm 10 is held at a prescribed position. As other member, elastic member functioning as a packing (including resin member), adhesive resin, etc. are included. More specifically, the edge 11 vibratably supports the diaphragm 10 in the vibration direction (Z-axis direction), and restrains vibration in the direction orthogonal to the vibration direction (Y-axis direction). The edge 11 is formed in a ring shape (annular shape) viewed from the sound emission direction, and the cross-section of the edge 11 is formed in a prescribed shape, for example, a concave shape, convex shape, corrugated shape, etc. in the sound emission direction. As the forming material of the edge 11, conventional material, for example, fur, cloth, rubber, resin, a filler-applied member with a material such as fur, cloth, rubber or resin, rubber member or resin member molded in a prescribed shape, may be adopted. Further, in a part or whole circumference of the edge 11, a projection part projecting from the front face (in the sound emission direction), or from the rear face (in the direction opposite to the sound emission direction) or a concave portion may be formed, rigidity of the edge 11 in a prescribed direction may be increased.
The static part 100 is divided into a first frame 12B (a first configuring member 100A) and a second frame 12C (a second configuring member 100B), and the diaphragm 10 is supported around an opening part at the center of the first frame 12B via the edge 11. The magnetic circuit 20 has a structure, which can be divided into two parts sandwiching the voice coil 30, one part arranged above and the other part arranged below the voice coil 30. The upper one part is supported by the first frame 12B and the lower other part is supported by the second frame 12C. According to the example shown in the drawing, an upper yoke 22B with respect to the first frame 12B and a lower yoke 22A with respect to the second frame 12C are supported substantially in parallel respectively.
The static part 100 includes an outer peripheral frame part 101 surrounding the diaphragm 10 and a bridge part 102 bridging inside of the outer peripheral frame part 101. The bridge part 102 exerts a reaction force on the above link body 50L (vibration direction converter part 50), and has rigidity in the vibration direction of the link body 50L.
As described above, upon vibration of the voice coil 30, the vibration is transmitted to the diaphragm 10 via the link body 50L. At this time, the link body 50L angle converting the link part 51 is subjected to a reaction force exerted by the diaphragm 10. When the link body 50L is subjected to this reaction force, if the static part 100 supporting the link body 50L is deflected, the link body 50L itself vibrates, and thus the link body 50L may transmit unwanted vibration to the link part 51. When the unwanted vibration transmitted to the link part 51 is transmitted to the diaphragm 10, the vibration of the voice coil 30 may not be efficiently transmitted to the diaphragm 10. Accordingly, the bridge part 102, which is a part of the static part 100 supporting the link body 50L, is provided with a function of restraining generation of deflection, and thus unwanted vibration that may be transmitted to the link part and the diaphragm 10 may be restrained. As such, vibration of the voice coil 30 may be efficiently transmitted to the diaphragm 10.
In order that the bridge part 102 supporting the link body 50L may have rigidity against a force exerted by the diaphragm 10 via the link body 50L, compliance of the bridge part 102 is preferably substantially the same or smaller than compliance of the outer peripheral frame part 101 in the vibration direction of the diaphragm 10. More specifically, thickness of the bridge part 102 is preferably substantially the same or larger than thickness in a part of the static part 100 supporting the diaphragm 10 or the magnetic circuit 20.
In the example shown in the drawing, the bridge part 102 provided at the second frame 12C has a first projection part 102A projecting in the direction that the bridge part entends and in the vibration direction of the diaphragm 10. This first projection part 102A includes a rib structure formed in a longitudinal direction of the bridge part 102, which increases bending rigidity of the bridge part 102. Further, a second projection part 102B is formed extending in the direction crossing the first projection part 102A, in the plane of the bridge part 102 facing the diaphragm 10. This second projection part 102B acts as a reinforcing rib at both end portions of the bridge part 102, and rigiditly supports the bridge part 102 at the outer peripheral frame part 101 by both end portions.
Further, the bridge part 102 has a third projecting part 102C crossing the first projection part 102A and the second projecting part 102B. The third projecting part 102C is formed in the plane of the static part 100 facing the diaphragm 10, and a reinforcing part 103 having polygonal planar shape is formed with a plurality of the second projection part 102B and the third projecting part 102C.
Further, the first frame 12B includes the outer peripheral frame part 101 of the static part 100 as a first outer peripheral frame part 101A, and includes a second outer peripheral frame part 101B supporting the diaphragm 10 inside the first outer peripheral frame part 101A. An opening inside the second outer peripheral frame part 101B is sealed by the edge 11 and the diaphragm 10. A projection part 101B1 projecting in the sound emission direction is formed at the second outer peripheral frame part 101B by which the diaphragm 10 is supported via the edge 11. With this projection part 101B1, rigidity to support the circumpherence of the diaphragm 10 is obtained.
The first frame 12B and the second frame 12C configuring the static part 100 are formed in a planar shape having a long axis and a short axis, and the bridge part 102 is formed in the short axis direction. Further, the bridge part 102 may be formed in the long axis direction or in the long and short axis directions, and thus rigidity of the static part 100 may be obtained.
Convex portions 100m are formed at the four corners of the first frame 12B, and concave portions 100n are formed at the four corners of the second frame 12C. The convex portions 100m and the concave portions 100n are fitted such that the first frame 12B and the second frame 12C are coupled. The convex portion 100m may be formed at one of the first frame 12B and the second frame 12C, and the concave portion 100n may be formed at the other one of the first frame 12B and the second frame 12C. The concave portion 100n may be formed to be a hole.
The vibration direction converter part 50 includes a first link part 51A and a second link part 51B as the link body 50L, and one end of the second link part 51B is supported by the first link part 51A and the other end is supported by the bridge part 102. The bridge part 102 supporting the second link part 51B is formed in a tabular shape, and a connecting part 104, where the other end of the second link part 51B and the bridge part 102 are connected, forms a single plane.
With the other end of the second link part 51B fitted in the bridge part 102, the vibration direction converter part 50 and the bridge part 102 are connected. A projection part 104A is formed at the connecting part 104 of the bridge part 102, and a hole 104B in which the projection part 104A is inserted, is formed at the connecting part 53C integrally formed at the end of the second link part 51B via the hinge part 52.
The projection part 104A of the connecting part 104 in the bridge part 102 acts as a positioning part positioning the vibration direction converter part 50 with respect to the static part 100. The vibration direction converter part 50 is positioned with respect to the static part 100, with the projection part 104A inserted into the hole 104B at the connecting part 53C, which is integrally formed at the end of the second link part 51B via the hinge part 52.
In the condition that the first frame 12B and the second frame 12C as a static part 100 are connected, the second connecting part 53B of the vibration direction converter part 50 is connected to the rear side of the diaphragm 10 supported by the first frame 12B, and the static connecting part 53C of the vibration direction converter part 50 is connected to the connecting part 104 formed at the central part of the bridge part 102 in the second frame 12C.
The second connecting part 53B is a part integrally formed at the end of the first link part 51A via the hinge part 52B, and the end of the first link part 51A and the diaphragm 10 is connected with this second connecting part 53B connected to the diaphragm 10. A concave portion is formed at the face of the diaphragm 10 in the sound emission side facing the second connecting part 53B, and the diaphragm 10 has rigidity. The static connecting part 53C is a part integrally formed at the end of the second link part 51B via a hinge part 52D, and the hole 104B is formed at the connecting part 53C. The projection part 104 is inserted into the hole 104B, and thereby the connecting part 104 and the end portion of the second link part 51B are connected.
The voice coil support part 40 supporting the voice coil 30 has one end portion at which the connecting part 60 is attached in the vibration direction of the voice coil supporting part 40, and the connecting part 60 is attached such that the connecting part 60 extends along the width of the voice coil support part 40. The connecting part 60 includes a connecting step part 60s to which the first connecting part 53A of the vibration direction converter part 50 is detachably connected, and a through hole 60p passing through in the vibration direction of the voice coil support part 40. The through-hole 60p is a vent hole formed to reduce air resistance exerted to the connecting part 60 upon vibration of the voice coil support part 40.
This connecting part 60 connects the first connecting part 53A of the vibration direction converter part 50 and the end portion of the voice coil support part 40 with an interval, which allows the height of the magnetic circuit 20 to fall within the range of the height of the vibration direction converter part 50.
This voice coil support part 40 and the connecting part 60 are held by the holding part 15 at the first frame 12B and the second frame 12C. The holding part 15 includes the first holding part 15A and the second holding part 15B, having curved plate member which allow a deformation in one direction in the vibration direction of the voice coil support part 40 and restrict deformations in other directions. The first holding part 15A and the second holding part 15B hold the voice coil support part 40 at the first frame 12B and the second frame 12C via the attachment unit 16. The first holding part 15A holds the connecting part 60 at one side part of the attachment unit 16, and the inner end portions of the first holding part 15A in the right side and left side are connected to both outer end portions of the connecting part 60, and each of outer ends of the first holding part 15A is connected to the attachment unit 16. Further, the first holding part 15A is formed with a conducting metal and electrically connected to a lead wire 31 extending from the end portion of the voice coil 30 via the voice coil lead wire 32 (conducting layer 43), and an audio signal is supplied to the voice coil 30 via the first holding part 15A. Further, the first holding part 15A is electrically connected to linear terminal parts 81, 81 supported by the frame 12, and is electrically connected to outside via wirings 82, 82 electrically connected to these terminal parts 81, 81.
The second holding part 15B has the central part connected to other side part of the attachment unit 16 and both end portions connected to the right and left end portions of the voice coil support part 40. In this example, the second holding part 15B is arranged within the width of the voice coil support part 40 such that a holding body of the voice coil support part 40 does not take up space in the width direction of the voice coil support part 40. Further, although the second holding part 15B, which is formed with a continuous member, has a continuous shape at the central part, it may be formed by a plurality of members. Although a part of the second holding part 15B is arranged projecting outside the static part 100, a part of the second holding part 15B may be modified so as to fit into the static part 100.
A pair of common terminal parts 81, 81 with respect to a plurality of the voice coils 30, 30, extending from one voice coil 30 to another voice coil 30 among a plurality of voice coils, is provided at the static part 100 in order to input an audio signal to the voice coils 30, corresponding to a plurality of the driving parts 14. Further, the terminal parts 81, 81 are arranged in an opening (not shown) formed between the first frame 12B and the second frame 12C, which configure the frame 12 as the static part 100. As such, space may be saved in arrangement of the terminal part compared to the case in which an individual terminal part is arranged at both end portions of each voice coil 30, and thus a speaker device may be made small or thin. Further, the terminal parts 81, 81 may be stably fixed to the static part 100, and thereby a bad connection to the voice coils 30, 30 may be avoided. Further, the terminal parts 81, 81 are formed to have a long axis extending from one voice coil 30 to another voice coil 30 and a short axis crossing the long axis. With the long and thin shape as above, efficiency of the installation space may be improved.
The terminal parts 81, 81 include connecting parts 81a connected to wirings 82, 82 (second wiring), which are electrically connected to outside and the terminal parts 81, 81 are electrically connected at the connecting part 81a. The wirings 82 are fixed to the side face of the static part 100 and connected to the terminal parts 81, 81. The outer peripheral frame part 101 of the static part 100 includes a side face to which a wiring 82 is attached, and guiding parts 106, 106 guiding the wire 82 are formed at the side face of the static part 100.
Further, the voice coil lead wire 32 (conducting layer 43), connected to the lead wire 31 extending from the end portion of the voice coil 30, is formed on the voice coil support part 40 (base) supporting the voice coil 30. The conducting layer 43 is pattern-formed on the voice coil support part 40 (base) surrounding the conducting member of the voice coil 30, and this conducting layer 43 electrically connects the conducting member of the voice coil 30 and the holding part 15.
A wiring, electrically connecting the voice coil 30 and the terminal parts 81, is formed at the holding part 15 and the end portions of the terminal parts 81, 81 and the wiring are electrically connected. The wiring of the holding part 15 and the voice coil lead wire are connected, and the terminal parts 81, 81 and the wire 82 are connected, and thereby an external audio signal is inputted to the voice coil 30.
A connecting part F1, connected to the terminal parts 81, 81, is formed at the holding part 15. This connecting part F1 extends in the direction crossing the vibration direction of the diaphragm 10 (X-axis direction), and is formed in a tabular shape so as to contact with the terminal parts 81, 81. Also, a connecting part F2, connected to the voice coil lead wire 32, is formed at the holding part 15. The connecting part F2 extends in the direction crossing the vibration direction (Z-axis direction) of the diaphragm 10 and is formed in a tabular shape so as to contact with the end portion of the voice coil lead wire 32.
In the attachment unit 16, the attachment unit 16 includes an integral support part 16c integrally supporting a first connecting part 16a and a second connecting part 16b, the first connecting parts 16a, to which the end portion of the first holding part 15A is connected, are provided at both right and left sides of the connecting part 60, and the second connecting part 16b, to which the second holding part 15B is connected, is formed at the back of the voice coil support part 40. Further, connecting holes 16d, opposite to the convex portions 100m provided at the first frame 12B of the static part 100, are provided at the four corners of the attachment unit 16. With the convex portion 100m inserted into the connecting hole 16d and the concave portion 100n provided at the second frame 12C, the voice coil support part 40, the connecting part 60, the holding part 15 and the attachment unit 16 are unitized and fixed between the first frame 12B and the second frame 12C.
Further, when assembling the speaker device 1T, the first connecting parts 53A (R), 53A(L) of the direction converter part 50 shown in
In the example shown in the drawing, the upper yoke 22B of the magnetic circuit 20 is first mounted to the inner face of the first frame 12B, and then the attachment unit 16, the vibration direction converter part 50, etc. are mounted thereto, and thus positioned respectively. And, the second frame 12C is stacked so as to sandwich each component between the first frame 12B and the second frame 12C while the lower yoke 22A of the magnetic circuit 20 is mounted thereto. Finally, the second connecting part 53B of the vibration direction converter part 50 and the diaphragm 10 are joined with adhesive as a joining member, while the outer periphery part of the diaphragm 10 is attached to the second outer peripheral frame part 101B of the first frame 12B via the edge 11. Further, a groove part is circumferenctially formed at the bottom portion of the second outer peripheral frame part 101B near the outer periphery part of the edge 11. The groove part is formed as a joining member reception part receiving protrusion of adhesive as a joining member joining the edge 11 and the first frame 12B. Further, a projection part projecting toward the frame 12B at the outer periphery of the edge 11 is formed and inserted into the groove, and thus a joining strength of the edge 11 and the first frame 12B may be strengthened.
Further, the assembling processes may be constructed as follows:
First, the wirings 82 is connected to the connect terminals 81, 81, and the magnet 21 is connected to the yoke 22. Next, the connect terminals 81, 81, to which the wirings 82 is connected, is attached to the outer peripheral frame part 101A of the first frame 12B. Next, a pair of the attachment units 16, to which the above voice coil 30 is attached, is attached to the first frame 12B. The connect terminals 81, 81 and the holding part 15A attached to the attachment unit 16 are electrically connected by soldering, etc. Next, the vibration direction converter part 50 is attached to the connecting part 104, and thus the vibration direction converter part 50 and the voice coil 30 are connected. Next, the second frame 12C is arranged on the first frame 12B, and the magnetic pole member (yoke part) 22 joined to the magnet 21 is attached to the outer peripheral frame part 101A of the second frame 12C. Next, the diaphragm 10 and the edge 11 are connected to the second outer peripheral frame part 101B of the first frame 12B. Next, the magnetic pole member (yoke part) 22 joined to the magnet 21 is attached to the outer peripheral frame part 101A of the first frame 12B. Finally, the wiring 82 is attached to the guiding part 106 provided at the first outer peripheral frame part 101A of the first frame 12B.
The frame 12 as the static part 100 includes the first frame 12B (the first configuring member) and the second frame 12C (the second configuring member) as described above, and the first frame 12B is arranged in the sound emission side of the speaker device 1T, while the second frame 12C is arranged in the opposite side (rear side) of the sound emission side. The driving part 14 of the speaker device 1 is supported so as to be sandwiched between the first frame 12B and the second frame 12C.
The annularly formed outer peripheral frame part 101 of the first frame 12B supports one side (22B) of the magnetic pole members (yoke part) 22
Meanwhile, the second frame 12C includes the outer peripheral frame part 101 and the bridge part 102 and supports the other side (22A) of the magnetic pole member (yoke part) 22 of the magnetic circuit 20.
The first frame 12B and the second frame 12C include a concave receiving part 105 receiving a part of the yoke part 22. A projecting part 22p is fitted into this receiving part 105 and the yoke part 22 is positioned to form a proper magnetic gap. Further, an opening 101s is formed between the bridge part 102 and the outer peripheral frame part 101 of the second frame 12C. The fourth projecting part (not shown) is formed along the outer periphery of the opening 101s of the outer peripheral frame part 101. The fourth projection part increases torsional rigidity of the outer peripheral frame part 101.
Further, an excessive-vibration restraining part 108 is formed at the first frame 12B to restrain an excessive vibration of the voice coil 30. The excessive-vibration restraining part 108 projects into a movable region of the voice coil 30, and an excessive vibration of the voice coil 30 is restrained with the excessive-vibration restraining part 108 contacted with the voice coil support part 40. More specifically, a notch part 41f is formed at the base of the voice coil support part 40, and the projection part of the excessive-vibration restraining part 108 is arranged in the notch part 41f (see
The magnetic circuit 20 is attached to the first frame 12B and the second frame 12C with the magnetic pole member 22 joined to the magnet. The magnetic pole member 22 has a plurality of projection parts 22p and the projection parts 22p are supported by the receiving part 105. A width of the plate shaped yoke part 22 is decreased from the vibration direction converter part 50 to the static part 100, and thus the holding part 15 is prevented from contacting the yoke part 22.
The magnetic circuit 20 has the yokes 22A and 22B attached to the first frame 12B and the second frame 12C, and an interval as the magnetic gap 20G is provided between the yokes 22A and 22B or the magnetic 21 by connecting the first frame 12B and the second frame 12C.
According to this embodiment, the height of the magnetic circuit 20 is substantially the total height of the whole device, and the voice coil support part 40 is configured to vibrate near the center of the magnetic circuit 20, while the end portion of the voice coil support part 40 and the end portion of the vibration direction converter part 50 are connected at different heights via the connecting part 60. As such, each link part of the vibration direction converter part 50 can secure a sufficient length within the height of the device, and a part of the height of the magnetic circuit 20 can be failed within the height of the vibration direction converter part 50. Further, with an interval formed between the first frame 12B and the upper yoke part 22B arranged near the first frame 12B, contact between the magnetic circuit 20 and the voice coil 30, caused by the vibration of the diaphragm 10 being transmitted to the magnetic circuit 20 via the upper yoke part 22B, may be restrained.
Accordingly, the speaker device according to embodiments or examples of the present invention can be made thin and can make louder sound. Further, a thin speaker device capable of emitting louder reproduced sound with a comparatively simple structure can be realized by vibrating the diaphragm in a direction different from the vibration direction of the voice coil. When converting the vibration direction of the voice coil to a different direction by using a mechanical link body, durability of the hinge part of the link body that can tolerate the high-speed vibration specific to a speaker device and flexibility that can restrain generation of abnormal sound during high-speed vibration, may be required. According to the configuration of the speaker device described above, the hinge part of the link body can have the durability and flexibility.
Further, in order to direction convert the vibration of the voice coil and transmit the vibration of the voice coil to the diaphragm, it is necessary to efficiently and accurately reproduce the vibration of the voice coil, and thus it may be necessary to prevent the link body from being deformed and make the link body itself light. In addition, it may be necessary to easily incorporate the link body into the speaker device and easily manufacture the link body itself. According to the configuration of the speaker device described above, a speaker device, which is light weight and easy to manufacture, can be realized.
This speaker device can be efficiently used as various types of electronic devices or in-car devices.
Further in a resident building, a hotel, an inn or a training facility as a building including a speaker device, when the speaker device 1 is provided on a wall or ceiling as the attaching counterpart, installation space in thickness direction required for the speaker device 1 may be reduced and thus enabling to save space in a room and make effective use of space. The hotel is capable of holding an event and accommodating many guests for conference, meeting, lecture, party, etc. Further, providing a room equipped with audiovisual equipment can be seen in recent years along with prevalence of a projector or a big-screen TV. On the other hand, there is also seen a living room, etc. used as a theater room without room equipped with audiovisual equipment. Also in this case, the living room, etc. can be easily converted to a theater room with the speaker device 1 while making effective use of space in the living room. More particularly, the placement at which the speaker device 1 is arranged may be, for example, ceiling or wall, etc. (attaching counterpart).
Although the embodiments according to the present invention are described with reference to the drawings, specific configurations are not limited to these embodiments, and modifications not departing from the subject matter of the present invention are included in the scope of the present invention. Further, the technology of each embodiment described above can be used by each other, unless specific contradictions or problems are found in their objects, the configurations, etc. In addition, PCT/JP2008/051197 filed on Jan. 28, 2008, PCT/JP2008/068580 filed on Oct. 14, 2008, PCT/JP2008/069480 filed on Oct. 27, 2008, PCT/JP2008/069269 filed on Oct. 23, 2008, PCT/JP2009/053752 filed on Feb. 27, 2009, PCT/JP2009/053592 filed on Feb. 26, 2009, PCT/JP2009/050764 filed on Jan. 20, 2009, PCT/JP2009/055533 filed on Mar. 19, 2009, PCT/JP2009/055496 filed on Mar. 19, 2009, PCT/JP2009/055497 filed on Mar. 19, 2009, PCT/JP2009/055498 filed on Mar. 19, 2009, PCT/JP2009/055534 filed on Mar. 19, 2009, PCT/JP2009/055523 filed on Mar. 19, 2009, PCT/JP2009/055524 filed on Mar. 19, 2009, PCT/JP2009/055525 filed on Mar. 19, 2009, PCT/JP2009/055526 filed on Mar. 19, 2009, PCT/JP2009/055527 filed on Mar. 19, 2009, PCT/JP2009/055528 filed on Mar. 19, 2009 are incorporated by reference into the present application.
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/JP2009/062479 | 7/9/2009 | WO | 00 | 2/25/2011 |