Patent Application
20160345102
The present technology relates to a technical field that regards to a speaker device in which a magnetic gap is filled with a magnetic fluid.
For example, there is a speaker device in which a yoke having an annular magnet and a center pole portion and a plate made of a magnetic material are included, and a voice coil wound around a coil bobbin is held by a magnetic gap formed between the center pole portion and the plate. In this type of speaker device, when the voice coil is energized, the coil bobbin changes (moves) in an axial direction of the center pole portion, and audio is output.
In addition, there is a speaker device, which is similar to the above-described speaker device, provided with an annular and elastic damper. Here, an inner circumferential portion of the damper is connected to an outer circumferential surface of a coil bobbin, and an outer circumferential portion of the damper is connected to a frame that functions as a casing. The damper has a function of holding a voice coil in a magnetic gap without touching a plate when the coil bobbin is changed.
Incidentally, the damper accounts for a certain weight ratio of the whole speaker device. Thus, the presence of the damper increases a weight of the speaker device and causes suppression of change of the coil bobbin and decrease in acoustic conversion efficiency. For example, the weight ratio of the damper to the whole speaker device is set to about 15% to 20%.
In this regard, there is a speaker device in which a predetermined portion is filled with a magnetic fluid instead of a damper, and a weight of the speaker device is reduced by omitting the damper, thereby improving acoustic conversion efficiency (for example, see Patent Document 1 and Patent Document 2).
A speaker device disclosed in Patent Document 1 has a configuration in which a magnetic gap at a position where a voice coil is present is filled with a magnetic fluid.
A speaker device disclosed in Patent Document 2 has a configuration in which a sub-magnetic circuit is included in addition to a main magnetic circuit, a sub-magnetic gap is formed in the sub-magnetic circuit, and the sub-magnetic gap is filled with a magnetic fluid to support a voice coil.
However, referring to the speaker device disclosed in Patent Document 1, since the voice coil is present in the magnetic gap filled with the magnetic there is a concern that, when an amplitude is large, the magnetic fluid may be easily scattered by agitation of the magnetic fluid due to unevenness of a cross-sectional shape of the voice coil, and the amount of the filled magnetic fluid may be reduced, and thus stable signal reproduction may be hindered.
In addition, referring to the speaker device disclosed in Patent Document 2, even though the sub-magnetic gap, in which no voice coil is present, is filled with the magnetic fluid, and thus the magnetic fluid is rarely scattered, the magnetic fluid filling the sub-magnetic gap is separated into an internal part and an external part by a coil bobbin. Therefore, there is a concern that fluidity of the magnetic fluid may be hindered, and thus accuracy of centering of the coil bobbin may decrease. Further, there is a concern that distortion of an input may be insufficiently reduced, and a stable signal reproduction operation may not be ensured.
Therefore, an object of the technology is to overcome the above-mentioned problems to improve acoustic conversion efficiency and ensure a stable signal reproduction operation.
In the first place, a speaker device according to the present technology includes: a magnet having a central axis; a yoke having a central axis, the central axis of the yoke being identical to the central axis of the magnet, the magnet being attached to the yoke; a main plate attached to the magnet; at least one sub-plate attached to the magnet and positioned to be separated from the main plate in an axial direction of the central axis; a coil bobbin formed in a tubular shape and changeable in the axial direction; a voice coil wound around an outer circumferential surface of the coil bobbin, at least a portion of the voice coil being disposed in a main magnetic gap formed between the main plate and the yoke; a vibration plate having an inner circumferential portion connected to the coil bobbin, and vibrating according to a change of the coil bobbin; and a magnetic fluid filling at least one sub-magnetic gap formed between the sub-plate and the yoke, and a through-hole positioned in the sub-magnetic gap filled with the magnetic fluid is formed in the coil bobbin.
In this way, the magnetic fluid flows between the sub-plate and the yoke through the through-hole.
In the second place, in the speaker device according to the present technology, it is desirable that a magnetic gradient is formed to change a magnetic force with respect to the magnetic fluid by changing a magnetic flux density in the axial direction.
In this way, the magnetic fluid to be scattered from the sub-magnetic gap is pulled to a side at which a magnetic force is strong in the axial direction.
In the third place, in the speaker device according to the present technology, it is desirable that a magnetic gradient is formed to change a magnetic force with respect to the magnetic fluid by changing a magnetic flux density in a circumferential direction of the central axis.
In this way, the magnetic fluid to be scattered from the sub-magnetic gap is pulled to a side at which a magnetic force is strong in the circumferential direction.
In the fourth place, in the speaker device according to the present technology, it is desirable that the through-hole is formed at a position allowing a flow of the magnetic fluid between the sub-plate and the yoke in a variation range of the coil bobbin in the axial direction.
In this way, the magnetic fluid flows between the sub-plate and the yoke through the through-hole irrespective of a changed location of the coil bobbin in the axial direction.
In the fifth place, in the speaker device according to the present technology, it is desirable that a plurality of through-holes is formed to be separated from one another in a circumferential direction of the coil bobbin, and positions of the plurality of through-holes are shifted in the axial direction.
In this way, the magnetic fluid flows between the sub-plate and the yoke through any one of the through-holes when the coil bobbin is changed in the axial direction.
In the sixth place, in the speaker device according to the present technology, it is desirable that the through-hole has a slit shape extending in the axial direction of the coil bobbin, and a plurality of through-holes is formed to be separated from one another in a circumferential direction of the coil bobbin, and positions of the plurality of through-holes are shifted in the axial direction.
In this way, the magnetic fluid flows between the sub-plate and the yoke through any one of the through-holes when the coil bobbin is changed in the axial direction.
In the seventh place, in the speaker device according to the present technology, it is desirable that the main magnetic gap is positioned on a side of the vibration plate from the sub-magnetic gap.
In this way, the voice coil is positioned on a side of the vibration plate.
In the eighth place, in the speaker device according to the present technology, it is desirable that the sub-magnetic gap is positioned on a side of the vibration plate from the main magnetic gap, a support ring is attached to an inner circumferential portion of the sub-plate, and at least a portion of the support ring is positioned inside the inner circumferential surface of the sub-plate.
In this way, an interval of the sub-magnetic gap formed between the sub-plate and the yoke becomes small.
In the ninth place, in the speaker device according to the present technology, it is desirable that the support ring corresponds to a magnetic substance.
In this way, a magnetic flux density of the sub-magnetic gap formed between the sub-plate and the center pole portion becomes high.
In the tenth place, in the speaker device according to the present technology, it is desirable that a saturated magnetic flux of the magnetic fluid is set to 30 ml to 40 mT, and a viscosity of the magnetic fluid is set to 300 cp or less.
In this way, the magnetic fluid is rarely scattered, and change of the coil bobbin is rarely suppressed by the magnetic fluid.
In the eleventh place, in the speaker device according to the present technology, it is desirable that a magnetic flux change unit forming the magnetic gradient in the axial direction is provided in the sub-plate or the yoke.
In this way, the magnetic gradient is easily formed in the axial direction of the yoke.
In the twelfth place, in the speaker device according to the present technology, it is desirable that a distal end portion of the yoke is caused to protrude from the sub-plate in the axial direction, and the distal end portion is provided as the magnetic flux change unit.
In this way, a configuration of the magnetic flux change unit is simplified.
In the thirteenth place, in the speaker device according to the present technology, it is desirable that an inclined plane inclined in the axial direction is formed on a surface of the sub-plate or the yoke, and a portion on which the inclined plane is formed is provided as the magnetic flux change unit.
In this way, processing of the magnetic flux change unit is simplified.
In the fourteenth place, in the speaker device according to the present technology, it is desirable that a curved surface is formed on a surface of the sub-plate or the yoke, and a portion on which the curved surface is formed is provided as the magnetic flux change unit.
In this way, a degree of freedom becomes high with respect to change of a magnetic flux density.
In the fifteenth place, in the speaker device according to the present technology, it is desirable that a magnetic flux change unit forming the magnetic gradient in the axial direction is provided in the sub-plate and the yoke.
In this way, the magnetic gradient is easily formed in the axial direction of the yoke, and a degree of freedom becomes high with respect to change of a magnetic flux density.
In the sixteenth place, in the speaker device according to the present technology, it is desirable that an inclined plane inclined in the axial direction is formed on respective surfaces of the sub-plate and the yoke, and respective portions on which the inclined plane is formed are provided as the magnetic flux change unit.
In this way, processing of the magnetic flux change unit is simplified, and a degree of freedom becomes high with respect to change of a magnetic flux density.
In the seventeenth place, in the speaker device according to the present technology, it is desirable that a curved surface is formed on a surface of the sub-plate or the yoke, and a portion on which the curved surface is formed is provided as the magnetic flux change unit.
In this way, a degree of freedom becomes high with respect to change of a magnetic flux density.
In the eighteenth place, in the speaker device according to the present technology, it is desirable that a plurality of lead wires connected to the voice coil is provided, and the plurality of lead wires is symmetrically disposed about a central axis of the coil bobbin.
In this way, occurrence of a rolling phenomenon of the coil bobbin is suppressed.
In the nineteenth place, in the speaker device according to the present technology, it is desirable that a plurality of lead wires connected to the voice coil, and at least one connecting wire connected to the coil bobbin are provided, and the plurality of lead wires and the connecting wire are symmetrically disposed about the central axis.
In this way, occurrence of a rolling phenomenon of the coil bobbin is suppressed.
According to the technology, a magnetic fluid flows between a sub-plate and a yoke through a through-hole, and thus it is possible to improve acoustic conversion efficiency and ensure a stable signal reproduction operation.
It should be noted that the effects described, herein are not restricted, and any effect described in this disclosure may correspond to the effects.
Hereinafter, content of the technology will be described according to accompanying drawings.
[Detailed Configuration of Speaker Device]
A description will be given of a detailed configuration of a speaker device 1 according to a first embodiment using
The upward, downward, forward, backward, leftward, and rightward directions described below are described for convenience of description, and the technology is not applied by being restricted to these directions.
The frame 2 has a tubular-shaped portion 3 formed in a substantially cylindrical shape, an attaching portion 4 that projects outward from a front edge of the tubular-shaped portion 3, and a connecting portion 5 that projects inward from a rear edge of the tubular-shaped portion 3.
A plurality of communication holes 3a, 3a, . . . separated from one another at equal intervals in a circumferential direction is formed in the tubular-shaped portion 3. Terminals 6 and 6 are attached to the tubular-shaped portion 3 at positions opposite to each other at 180° in the circumferential direction. The terminal 6 is provided as a junction for connection to an amplifier (not illustrated), and has a terminal portion 6a.
A sub-plate 22 made of a magnetic material is attached to a rear surface of the connecting portion 5 of the frame 2. The sub-plate 22 is formed in a substantially toric shape having a thin thickness.
Magnets 8 and 8 formed in toric shapes and separated from each other in a front-rear direction are disposed in a rear of the sub-plate 22. A front magnet 8 is attached to a rear surface of the sub-plate 22, and a main plate 7 made of a magnetic material is attached to between the magnets 8 and 8. The main plate 7 is formed in a substantially toric shape having a thin thickness.
A yoke 9 is attached to a rear surface of a rear magnet 8. The yoke 9 is formed by integrally forming a disc-shaped base surface portion 10 and a center pole portion 11 protruding forward from a center portion of the base surface portion 10. In addition, for example, the center pole portion 11 is formed in a columnar shape. Referring to the yoke 9, a front surface of the base surface portion 10 is attached to the rear surface of the rear magnet 8.
The main plate 7, the sub-plate 22, the magnets 8 and 8, and the yoke 9 are combined with one another while central axes thereof are identical to one another. Referring to the yoke 9, for example, a front surface of the center pole portion 11 is disposed on the same surface as a front surface of the sub-plate 22, and a space between the sub-plate 22 and the center pole portion 11 is formed as a sub-magnetic gap 21. A space between the main plate 7 and the center pole portion 11 is formed as a main magnetic gap 13.
A coil bobbin 14 is disposed on an outer circumferential side of the center pole portion 11 of the yoke 9 in a state in which the coil bobbin 14 is changeable (movable) in the front-rear direction, that is, an axial direction of the center pole portion 11. The coil bobbin 14 is formed in a cylindrical shape, and a voice coil 15 is wound around an outer circumferential surface in a rear end portion of the coil bobbin 14.
For example, through-holes 14a, 14a, . . . separated from one another at equal intervals in a circumferential direction are formed in the coil bobbin 14.
A portion of the voice coil 15 is positioned in the main magnetic gap 13. A portion of the coil bobbin 14 is positioned in the sub-magnetic gap 21, and another portion of the coil bobbin 14 is positioned in the main magnetic gap 13.
In the speaker device 1, a first magnetic circuit is configured by the main plate 7, the rear magnet 8, the base surface portion 10 of the yoke 9, and the center pole portion 11 of the yoke 9, and a second magnetic circuit is configured by the main plate 7, the front magnet 8, the sub-plate 22, and the center pole portion 11 of the yoke 9.
The sub-magnetic gap 21 is filled with a magnetic fluid 16. The coil bobbin 14 is changeable (movable) in the axial direction by an action of the magnetic fluid 16.
The magnetic fluid 16 is formed by dispersing particles of a magnetic substance in water or oil using a surfactant. For example, a saturated magnetic flux thereof is set to 30 millitesla (mT) to 40 mT, and a viscosity thereof is set to less than or equal to 300 centipoise (cP) (=3 Pascal·second (Pa·s)).
Both end portions of the voice coil 15 are connected to the terminals 6 and 6 by lead wires 17 and 17. The lead wires 17 and 17 are attached to the coil bobbin 14 while being symmetrically disposed about a central axis P of the coil bobbin 14 (see
An arbitrary number of lead wires 17 may be provided when a plurality of lead wires 17 is provided, and three or more lead wires 17 may be provided.
An annular vibration plate 18 is disposed on a front end side of the frame 2. Referring to the vibration plate 18, an outer circumferential edge is attached to the attaching portion 4 of the frame 2, and an inner circumferential edge is attached to a front end portion of the coil bobbin 14 (see
A center cap 19 is attached to an inner circumferential portion of the vibration plate 18, and the coil bobbin 14 is blocked from a front side by the center cap 19.
[Magnetic Circuits and Magnetic Flux Distribution]
Hereinafter, the magnetic circuits and a magnetic flux distribution of the speaker device 1 will be described with reference to
As illustrated in
In addition, the second magnetic circuit is configured by a path of the main plate 7, the front magnet 8, the sub-plate 22, the sub-magnetic gap 21, the center pole portion 11 of the yoke 9, and the main magnetic gap 13.
A magnetic flux density of the main magnetic gap 13 is increased by configuring two magnetic circuits when compared to a case in which one magnetic circuit is configured. In the present embodiment, two magnetic circuits are suitable. However, the number of magnetic circuits is not restricted to two, and another number of magnetic circuits may be provided.
Further, magnetic flux density distributions of the main magnetic gap 13 and the sub-magnetic gap 21 in each magnetic circuit are illustrated in
A value Pm of the magnetic flux density corresponds to a peak value in the main magnetic gap 13. A value Ps of the magnetic flux density corresponds to a peak value in the sub-magnetic gap 21. The value Ps of the sub-magnetic gap 21 has an opposite polarity to that of the value Pm of the magnetic flux density of the main magnetic gap 13, and an absolute value of the value Pm of the magnetic flux density is larger than an absolute value of the value Ps of the magnetic flux density.
[Action of Magnetic Fluid]
Hereinafter, an action of the magnetic fluid will be described with reference to
The magnetic gap 21 is filled with the magnetic fluid 16, and the portion of the coil bobbin 14 is positioned in the magnetic gap 21.
As illustrated in
[Shape of Wire of Voice Coil and Magnetic Fluid]
Hereinafter, a description will be given of a relation between a shape of the voice coil 15 and the magnetic fluid 16 (see
As illustrated in
The wire of the voice coil 15 is wound around the coil bobbin 14 more than once, and thus unevenness is formed on a surface side thereof depending on diameters and shapes of the wire. When the voice coil 15 is present inside the magnetic fluid 16, there is concern that the magnetic fluid 16 may be scattered in an amplitude direction due to the unevenness when the voice coil 15 vibrates. For this reason, the amount of the filled magnetic fluid 16 may be reduced, and stable centering of the coil bobbin 14 may be disrupted. In addition, there is concern that abnormal noise may be generated when the magnetic fluid 16 is agitated due to motion of the voice coil 15, and signal generation sound may be distorted.
In this regard, in the speaker device 1, at least two magnetic gaps (the sub-magnetic gap 21 and the main magnetic gap 13) are formed, the voice coil 15, around which the coil bobbin 14 is wound, is positioned in the main magnetic gap 13 which is not filled with the magnetic fluid 16, and the sub-magnetic gap 21, in which a portion of the coil bobbin 14 is positioned, is filled with the magnetic fluid 16.
In this way, the sub-magnetic gap 21 is filled with the magnetic fluid 16, and the coil bobbin 14 is held at this position. In addition, the coil bobbin 14 corresponds to a thin foil-like material (aluminum, polyimide film, and the like), and a surface thereof is smoothly finished. Thus, there is no unevenness. For this reason, even when the coil bobbin 14 vibrates, there is no action for scattering the magnetic fluid 16, and the amount of the filled magnetic fluid 16 is rarely reduced.
Therefore, a decrease in the amount of the filled magnetic fluid 16 is suppressed, and thus a stable centering state of the coil bobbin 14 is ensured, generation of abnormal noise is prevented, acoustic conversion efficiency is improved, and excellent signal reproduction sound is acquired.
In addition, since the coil bobbin 14 is centered by the magnetic fluid 16, a damper for centering the voice coil 15 is unnecessary. Thus, improvement in acoustic conversion efficiency according to weight reduction of the speaker device 1 is attempted.
Further, as described in the foregoing, the through-holes 14a, 14a, . . . are formed in the coil bobbin 14. The through-holes 14a, 14a, . . . are positioned in the sub-magnetic gap 21 in which the magnetic fluid 16 is present.
Therefore, the magnetic fluid 16 flows between the sub-plate 22 and the center pole portion 11 of the yoke 9 through the through-holes 14a, 14a, . . . , and thus the magnetic fluid 16 filling the sub-magnetic gap 21 is not separated into an internal part and an external part by the coil bobbin 14. Therefore, excellent fluidity of the magnetic fluid 16 may be ensured, and thus accuracy of centering of the coil bobbin 14 may be improved, distortion of an input may be sufficiently reduced, and a stable signal reproduction operation may be ensured.
[Speaker Devices of Second Embodiment to Fifteenth Embodiment]
Hereinafter, a description will be given of speaker devices of a second embodiment to a fifteenth embodiment with reference to
With regard to the speaker devices of the second embodiment to the fifteenth embodiment described below, a different portion from that of the first embodiment will be mainly described, and figures will be omitted.
A speaker device 1A of the second embodiment will be described with reference to
Contrary to the speaker device 1 of the first embodiment, a main magnetic gap 13 is filled with a magnetic fluid 16 in the speaker device 1A of the second embodiment. In this way, stability of a vibration operation of a coil bobbin 14 increases when compared to an embodiment in which one magnetic gap is filled with the magnetic fluid 16.
A speaker device 1B of the third embodiment will be described with reference to
Contrary to the speaker device 1 of the first embodiment, one magnetic circuit is provided in the speaker device 1B of the third embodiment. That is, a magnetic circuit is formed on a front side of a support frame 41 made of a nonmagnetic material. In the speaker device 1B, a yoke 9 is configured only by a center pole portion 11 (this description is applied to a speaker device 1C to a speaker device 1G described below).
The speaker device 1B is similar to the above description in that two magnetic gaps corresponding to a main magnetic gap 13 and a sub-magnetic gap 21 are included inside the magnetic circuit, and the sub-magnetic gap 21 is filled with a magnetic fluid 16. The speaker device 1B has only one magnet 8. Thus, the speaker device 1B has a simple structure, and may be miniaturized.
The speaker device 1C of the fourth embodiment will be described with reference to
Contrary to the speaker device 1B of the third embodiment, a main magnetic gap 13 is filled with a magnetic fluid 16 in the speaker device 1C of the fourth embodiment. In this way, stability of a vibration operation of a coil bobbin 14 increases when compared to an embodiment in which one magnetic gap is filled with the magnetic fluid 16.
The speaker device 1D of the fifth embodiment will be described with reference to
Contrary to the speaker device 1 of the first embodiment, a sub-magnetic gap 23 is provided in addition to a sub-magnetic gap 21 in the speaker device 1D of the fifth embodiment. The sub-magnetic gap 23 is formed between a sub-plate 24 and a yoke 9.
In this way, the sub-magnetic gap 21 and the sub-magnetic gap 23 are formed on opposite sides of a voice coil 15, and a coil bobbin 14 is supported in the sub-magnetic gap 21 and the sub-magnetic gap 23. Thus, the coil bobbin 14 is more stably centered.
The speaker device 1E of the sixth embodiment will be described with reference to
Contrary to the speaker device 1D of the fifth embodiment, a sub-magnetic gap 21 is not filled with a magnetic fluid 16, and a main magnetic gap 13 is filled with the magnetic fluid 16 in the speaker device 1E of the sixth embodiment. In this way, stability of a vibration operation of a coil bobbin 14 increases when compared to an embodiment in which one magnetic gap is filled with the magnetic fluid 16.
The speaker device 1F of the seventh embodiment will be described with reference to
Contrary to the speaker device 1D of the fifth embodiment, a main magnetic gap 13 is filled with a magnetic fluid 16 in the speaker device 1F of the seventh embodiment. In this way, stability of a vibration operation of a coil bobbin 14 further increases.
The speaker device 1G of the eighth embodiment will be described with reference to
Contrary to the speaker device 1B of the third embodiment, positions of a sub-magnetic gap 21 and a main magnetic gap 13 are switched in the speaker device 1G of the eighth embodiment. Then, a main plate 7 is attached to a front surface of a magnet 8, and a sub-plate 24 is attached to a rear surface of the magnet 8. A sub-magnetic gap 23 is filled with a magnetic fluid 16.
The speaker device 1G has only one magnet 8. Thus, the speaker device 1G has a simple structure, and may be miniaturized.
The speaker device 1H of the ninth embodiment will be described with reference to
The speaker device 1H has magnets 8X and 8X, a yoke 9X, and a sub-plate 22X.
A center portion of the yoke 9X is attached to a rear surface of a rear magnet 8X. The yoke 9X has a disc-shaped base surface portion 10X and a circumferential surface portion 11X that protrudes forward from an outer circumferential portion of the base surface portion 10X. The circumferential surface portion 11X includes a cylindrical portion 11a, a front flange portion 11b that projects inward from a front end portion of the cylindrical portion 11a, and a rear flange portion 11c that projects inward from a center portion of the cylindrical portion 11a in a front-rear direction.
The magnets 8X and 8X are formed in disc shapes, and a main plate 7X made of a magnetic material is attached to a front surface of the rear magnet 8X. The main plate 7X is formed substantially in a disc shape having a thin thickness. A front magnet 8X is attached to a front surface of the main plate 7X.
A sub-plate 22X made of a magnetic material is attached to a front surface of the front magnet 8X. The sub-plate 22X is formed substantially in a disc shape having a thin thickness.
The main plate 7X, the sub-plate 22X, the magnets 8X and 8X, and the base surface portion 10X of the yoke 9X are combined with one another while central axes thereof are identical to one another.
A space is formed between the main plate 7X and the rear flange portion 11c of the yoke 9X, and this space is formed as a main magnetic gap 13X. A space is formed between the sub-plate 22X and the front flange portion 11b of the yoke 9X, and this space is formed as a sub-magnetic gap 21X.
A coil bobbin 14 is disposed on an outer circumferential side of the sub-plate 22X and the main plate 7X in a state in which the coil bobbin 14 is changeable (movable) in the front-rear direction. At least a portion of a voice coil 15 wound around the coil bobbin 14 is positioned in the main magnetic gap 13X, and respective portions of the coil bobbin 14 are positioned in the main magnetic gap 13X and the sub-magnetic gap 21X.
In the speaker device 1H, a first magnetic circuit is configured by the main plate 7X, the rear flange portion 11c of the yoke 9X, the cylindrical portion 11a of the yoke 9X, the base surface portion 10X of the yoke 9X, and the rear magnet 8X. In addition, a second magnetic circuit is configured by the main plate 7X, the rear flange portion 11c of the yoke 9X, the cylindrical portion 11a of the yoke 9X, the front flange portion 11b of the yoke 9X, the sub-plate 22X, and the front magnet 8X.
The sub-magnetic gap 21X is filled with a magnetic fluid 16.
In the speaker device 1H, the voice coil 15 is positioned in the main magnetic gap 13X, and the sub-magnetic gap 21X is filled with a magnetic fluid 16. Thus, when the coil bobbin 14 is changed, the magnetic fluid 16 is rarely scattered, and the amount of the filled magnetic fluid 16 rarely decreases. Further, a stable centering state of the coil bobbin 14 may be ensured.
The speaker device 1I of the tenth embodiment will be described with reference to
Contrary to the speaker device 1H of the ninth embodiment, a main magnetic gap 13X is filled with a magnetic fluid 16 in the present embodiment.
In this way, stability of a vibration operation of a coil bobbin 14 increases when compared to an embodiment in which one magnetic gap is filled with the magnetic fluid 16.
The speaker device 1J of the eleventh embodiment will be described with reference to
Contrary to the speaker device 1H of the ninth embodiment, one magnetic circuit is provided in the present embodiment. That is, a columnar member 42 corresponding to a nonmagnetic material is attached to a front side of a center portion of a support frame 41. Further, a yoke 9X is attached to the front side of the support frame 41, and a main plate 7X is attached to a front side of the columnar member 42.
In this way, a magnetic circuit is configured by including one magnet 8X, and thus cost is reduced.
The speaker device 1K of the twelfth embodiment will be described with reference to
Contrary to the speaker device 1J of the eleventh embodiment, a main magnetic gap 13X is filled with a magnetic fluid 16 in the present embodiment.
In this way, stability of a vibration operation of a coil bobbin 14 increases when compared to an embodiment in which one magnetic gap is filled with the magnetic fluid 16.
The speaker device 1L of the thirteenth embodiment will be described with reference to
Contrary to the speaker device 1H of the ninth embodiment, one magnetic gap is added as a sub-magnetic gap 23, and the sub-magnetic gap 23 is filled with a magnetic fluid 16 in the present embodiment. A sub-plate 24 is attached to a front side of a support frame 41, and the sub-magnetic gap 23 is formed between the sub-plate 24 and a yoke 9X.
In this way, a sub-magnetic gap 21X and the sub-magnetic gap 23 are filled with magnetic fluids 16 and 16, respectively.
Thus, a coil bobbin 14 is more stably centered.
The speaker device 1M of the fourteenth embodiment will be described with reference to
Contrary to the speaker device 1L of the thirteenth embodiment, a sub-magnetic gap 21X is not filled with a magnetic fluid 16, and a main magnetic gap 13X is filled with the magnetic fluid 16 in the present embodiment.
In this way, stability of a vibration operation of a coil bobbin 14 increases when compared to an embodiment in which one sub-magnetic gap is filled with the magnetic fluid 16.
The speaker device 1N of the fifteenth embodiment will be described with reference to
Contrary to the speaker device 1L of the thirteenth embodiment, a main magnetic gap 13X is filled with a magnetic fluid 16 in the present embodiment.
Stability of a vibration operation of a coil bobbin 14 increases.
[Relation Between Magnetic Force Gradient of Sub-Magnetic Gap in Axial Direction and Scattering of Magnetic Fluid]
Hereinafter, a description will be given of a relation between a magnetic force gradient in the axial direction and an operation of the magnetic fluid 16 with respect to an amplitude in the axial direction of the coil bobbin 14 held in the sub-magnetic gap 21 with reference to
Description below will be given with regard to the speaker device 1 according to the first embodiment as an example.
On the other hand, when an inclined plane 12a that functions as a magnetic flux change unit is formed in a distal end portion of the yoke 9 (center pole portion 11), a magnetic flux density distribution of the sub-magnetic gap 21 is asymmetric in the amplitude direction, and has a characteristic in that a gradient Ta is included as illustrated in
Next, a description will be given of respective modified examples of the magnetic flux change unit that forms a magnetic gradient in the axial direction of the center pole portion 11 of the yoke 9 with reference to
The magnetic flux change unit according to the modified examples illustrated below is formed in the sub-plate 22 or the center pole portion 11 of the yoke 19. Hereinafter, description will be given of only different portions of the sub-plate 22 or the center pole portion 11. With regard to the sub-plate 22, the center pole portion 11, and the like similar to that of the speaker device 1 described above, the same reference numeral as that of a similar portion in the speaker device 1 will be applied, and a description thereof will be omitted.
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As in the sixth modified example and the seventh modified example described above, when the magnetic flux change units 12A and 12B and the magnetic flux change units 12D and 12E are provided in the center pole portions 11A and 11B and the sub-plate 22D and 22E, respectively, a degree of freedom increases with respect to change of a magnetic flux density, and improvement in a design freedom may be attempted.
[Summary of Magnetic Flux Change Unit that Forms Magnetic Gradient in Axial Direction]
As in the first modified example, the fourth modified example, and the sixth modified example described above, when the inclined planes 12a and 12d are formed, and portions in which the inclined planes 12a and 12d are formed are provided as the magnetic flux change units 12A and 12D, a magnetic gradient may be easily formed after ensuring simplicity of a shape of the center pole portion 11A or the sub-plate 22D.
In addition, as in the second modified example, the fifth modified example, and the seventh modified example described above, when the curved surfaces 12b and 12e are formed, and portions in which the curved surfaces 12b and 12e are formed are provided as the magnetic flux change units 12B and 12E, a magnetic gradient may be easily formed after ensuring simplicity of a shape of the center pole portion 11B or the sub-plate 22E.
[Relation Between Magnetic Force Gradient of Sub-Magnetic Gap in Circumferential Direction and Scattering of Magnetic Fluid]
Hereinafter, a description will be given of a relation between a magnetic force gradient of the sub-magnetic gap 21 in the circumferential direction and scattering of the magnetic fluid 16 with reference to
As illustrated in
[Magnetic Gradient in Axial Direction and Circumferential Direction]
As described in the foregoing, in an embodiment of the speaker device 1, the magnetic flux change unit 12 (12A, 12B, . . . ) is formed in the center pole portion 11 of the yoke 9. The magnetic flux change unit 12 of the center pole portion 11 has a function of forming a magnetic gradient Ta that changes a magnetic force with respect to the magnetic fluid 16 by changing a magnetic flux density in the axial direction, that is, a direction in which the coil bobbin 14 changes (see
In the speaker device 1, a minimum value Samin of a magnetic flux density in the circumferential direction (see
Therefore, as illustrated in
Hereinafter, a description will be given of respective modified examples of the magnetic flux change unit that forms a magnetic gradient in the circumferential direction of the center pole portion of the yoke with reference to
The magnetic flux change unit according to the modified examples illustrated below is formed in the sub-plate or the center pole portion of the yoke. Hereinafter, description will be given of only different portions of the sub-plate 22 or the center pole portion 11. With regard to the sub-plate or the center pole portion similar to that of the speaker device 1 described above, the same reference numeral as that of a similar portion in the speaker device 1 will be applied, and a description thereof will be omitted.
As illustrated in
An arbitrary number of magnetic flux change units 22a may be provided. Five or fewer magnetic flux change units 22a may be provided or seven or more magnetic flux change units 22a may be provided.
In addition, for example, a cross-sectional shape of each magnetic flux change unit 22a perpendicular to an axial direction is formed in a substantially semicircular shape. However, the cross-sectional shape may be formed in another shape such as a triangular shape, a quadrangular shape, and the like.
As illustrated in
An arbitrary number of magnetic flux change units 11x may be provided. Five or fewer magnetic flux change units 11x may be provided or seven or more magnetic flux change units 11x may be provided.
In addition, for example, a cross-sectional shape of each magnetic flux change unit 11x perpendicular to an axial direction is formed in a substantially semicircular shape. However, the cross-sectional shape may be formed in another shape such as a triangular shape, a quadrangular shape, and the like.
A third modified example is configured by combining the sub-plate 22A with the center pole portion 11A. As illustrated in
An arbitrary number of magnetic flux change units 22a and an arbitrary number of magnetic flux change units 11x may be provided. Two or fewer magnetic flux change units 22a and two or fewer magnetic flux change units 11x may be provided. In addition, four or more magnetic flux change units 22a and four or more magnetic flux change units 11x may be provided.
Further, for example, a cross-sectional shape of each of the magnetic flux change unit 22a and the magnetic flux change unit 11x perpendicular to an axial direction is formed in a substantially semicircular shape. However, the cross-sectional shape may be formed in another shape such as a triangular shape, a quadrangular shape, and the like.
In this way, when the magnetic flux change units 22a, 22a, and 22a and the magnetic flux change units 11x, 11x, and 11x are formed in the sub-plate 22A and the center pole portion 11A, respectively, a degree of freedom increases with respect to change of a magnetic flux density, and improvement in a design freedom may be attempted.
In addition, when the magnetic flux change units 22a, 22a, and 22a formed on an inner circumferential surface of the sub-plate 22A and the magnetic flux change units 11x, 11x, and 11x formed on an outer circumferential surface of the center pole portion 11A are alternately positioned in the circumferential direction, a magnetic flux changes at many positions in the circumferential direction in a well-balanced manner. Thus, an excellent magnetic balance may be ensured, and the coil bobbin 14 may be smoothly displaced.
[Summary of Magnetic Flux Change Unit that Forms Magnetic Gradient in Circumferential Direction]
As described in the foregoing, when a plurality of magnetic flux change units 22a, 22a, . . . or a plurality of magnetic flux change units 11x, 11x, . . . is formed to be separated to one another in the circumferential direction, the magnetic flux change units 22a, 22a, . . . or the magnetic flux change units 11x, 11x, . . . are symmetric. Thus, an excellent magnetic balance may be ensured, and the coil bobbin 14 may be smoothly displaced.
In addition, depressions extending in the axial direction are formed as the magnetic flux change units 22a, 22a, . . . and the magnetic flux change units 11x, 11x, . . . . Thus, the magnetic flux change units 11x, 11x, . . . and the magnetic flux change units 11x, 11x, . . . may be easily formed, and miniaturization of the speaker device 1 may be attempted without increase in an external diameter of the speaker device 1.
[Description of Through-Holes]
The through-holes 14a, 14a, . . . formed in the coil bobbin 14 (see
As described in the foregoing, when the through-hole 14a is formed, the magnetic fluid 16 flows between the sub-plate 22 and the center pole portion 11 of the yoke 9 through the through-hole 14a. Therefore, excellent fluidity of the magnetic fluid 16 may be ensured, and thus accuracy of centering of the coil bobbin 14 may be improved, distortion of an input may be sufficiently reduced, and a stable signal reproduction operation may be ensured.
Shapes of the through-holes 14a, 14a, . . . may correspond to a shape such as a round shape, an angular, a slit shape, a curved slit shape, and the like.
Next, a description will be given of respective modified examples related to the through-hole formed in the coil bobbin 14.
In a first modified example, as illustrated in
In this way, when the through-holes 14b, 14b, . . . and the through-holes 14c, 14c, . . . are positioned to be separated from one another in the axial direction of the coil bobbin 14, respectively, a magnetic fluid 16 easily flows through either the through-holes 14b, 14b, . . . or the through-holes 14c, 14c, . . . when the coil bobbin 14 is changed in the axial direction.
In addition, when the through-holes 14b, 14b, . . . are formed to be shifted from the through-holes 14c, 14c, . . . in the axial direction, at least one of the through-holes 14b, 14b, . . . or the through-holes 14c, 14c, . . . is located at a position at which the magnetic fluid 16 is present, and thus the magnetic fluid 16 more easily flows.
In a second modified example, as illustrated in
In the second modified example, the through-holes 14d, 14d, . . . and the through-holes 14e, 14e, . . . are formed in the slit shapes that extend in the axial direction, and thus a magnetic fluid 16 more easily flows through either the through-holes 14d, 14d, . . . or the through-holes 14e, 14e, . . . when the coil bobbin 14 is changed in the axial direction.
In a third modified example, as illustrated in
In the third modified example, when the coil bobbin 14 is changed in the axial direction, a magnetic fluid 16 easily flows through either the through-holes 14f, 14f, . . . or the through-holes 14g, 14g, . . . . In addition, since the through-holes 14f, 14f, . . . and the through-holes 14g, 14g, . . . are formed in the circular shapes, stress concentration rarely occurs at opening edges of the through-holes 14f, 14f, . . . and the through-holes 14g, 14g, . . . , and a high rigidity of the coil bobbin 14 may be ensured.
Hereinafter, a description will be given of a support ring 25 installed on the sub-plate 22 with reference to
When the coil bobbin 14 is installed in assembly of the speaker device 1, the coil bobbin 14 is installed by being inserted into the sub-plate 22 from a front side of the speaker device 1. A radius of a center portion of the sub-plate 22 is larger than an outer circumference (external diameter) of the voice coil 15. In this way, the voice coil 15 may smoothly pass through the sub-magnetic gap 21 which is formed on an inner circumferential side of the sub-plate 22.
However, when a size of a center hole of the sub-plate 22 is determined in consideration of the external diameter of the voice coil 15, the center hole of the sub-plate 22 becomes large, and the coil bobbin 14 is smoothly installed. However, there is concern that a function of holding the magnetic fluid 16 may become unstable due to decrease in magnetic flux density that holds the magnetic fluid 16, and centering effect of the coil bobbin 14 may be insufficient. In addition, the amount of the filled magnetic fluid 16 increases, and production cost increases.
In the regard, as illustrated in
In this way, the function of holding the magnetic fluid 16 may become stable.
The support ring 25 is preferably made of a magnetic material. When the support ring 25 is formed using the magnetic material, a value of a magnetic flux density of the sub-magnetic gap 21 may be increased to a peak value 40 (see
In addition, the support ring 25 may be made of a nonmagnetic material. In this case, even though there is no effect that a magnetic flux density is increased, stability of centering effect of the coil bobbin 14 may be improved, and the amount of the filled magnetic fluid 16 may be reduced.
[Arrangement of Lead Wire, and the Like with Respect to Coil Bobbin]
As described in the foregoing, the both end portions of the voice coil 15 are connected to the terminals 6 and 6 by the lead wires 17 and 17, respectively (see
In this way, tensile forces are applied to the coil bobbin 14 in substantially opposite directions at 1800 to each other by the lead wires 17 and 17, and a so-called rolling phenomenon in which the coil bobbin 14 is inclined to a direction in which a shaft falls rarely occurs when the coil bobbin 14 is changed.
An arbitrary number of lead wires 17 may be provided when a plurality of lead wires 17 is provided, and three or more lead wires 17 may be provided.
Next, a description will be given of respective modified examples related to a state in which the lead wire and the like are arranged with respect to the coil bobbin with reference to
With regard to the modified examples described below, only the lead wire and the like will be described. The same reference numeral as that in the speaker device 1 will be applied to the coil bobbin around which the voice coil connected to the lead wire and the like is wound, and a description thereof will be omitted.
In a first modified example, as illustrated in
In a second modified example, as illustrated in
For example, the connecting wire 20 is formed using the same material as that of the lead wire 17, and both ends of the connecting wire 20 are attached to a frame 2 and the coil bobbin 14, respectively. Similarly to the lead wire 17, the connecting wire 20 may have a function of supplying current to a voice coil 15.
In a third modified example, as illustrated in
For example, the connecting wire 20 is formed using the same material as that of the lead wire 17, and both ends of the connecting wire 20 are attached to a frame 2 and the coil bobbin 14, respectively. Similarly to the lead wire 17, the connecting wire 20 may have a function of supplying current to a voice coil 15.
In a fourth modified example, as illustrated in
For example, the connecting wire 20 is formed using the same material as that of the lead wire 17, and both ends of the connecting wire 20 are attached to a frame 2 and the coil bobbin 14, respectively. Similarly to the lead wire 17, the connecting wire 20 may have a function of supplying current to a voice coil 15. In addition, three or more connecting wires 20 may be disposed when the connecting wires 20 and the lead wires 17 and 17 are symmetrically disposed about the central axis P of the coil bobbin 14 with respect to the coil bobbin 14.
In a fifth modified example, as illustrated in
For example, the connecting wire 20 is formed using the same material as that of the lead wire 17, and both ends of the connecting wire 20 are attached to a frame 2 and the coil bobbin 14, respectively. Similarly to the lead wire 17, the connecting wire 20 may have a function of supplying current to a voice coil 15. In addition, three or more connecting wires 20 may be disposed when the connecting wires 20 and the lead wires 17 and 17 are symmetrically disposed about the central axis P of the coil bobbin 14 with respect to the coil bobbin 14.
As in the second modified example to the fifth modified example described above, when lead wires 17 and 17 and at least one connecting wire 20 are disposed at equal angles (symmetrically) about a central axis P of a coil bobbin 14, a rolling phenomenon of the coil bobbin 14 may be prevented from occurring, thereby attempting further improvement in sound quality of output audio.
As described in the foregoing, in the speaker device 1, the sub-magnetic gap 21 and the main magnetic gap 13 are formed, and the sub-magnetic gap 21 is filled with the magnetic fluid 16 to hold the coil bobbin 14. In addition, the through-hole 14a is formed in the coil bobbin 14.
For this reason, the magnetic fluid 16 easily flows in the sub-magnetic gap 21, agitation thereof is suppressed, and centering effect that holds the coil bobbin 14 in a center position inside the sub-magnetic gap 21 is stable. Further, it is possible to attempt improvement in acoustic conversion efficiency and improvement in sound quality.
In addition, a magnetic gradient is formed to change a magnetic force with respect to the magnetic fluid 16 by changing a magnetic flux density in the circumferential direction of the center pole portion 11.
Therefore, when the coil bobbin 14 is changed, the magnetic fluid 16 is not scattered from the sub-magnetic gap 21, and the amount of the magnetic fluid 16 filling the sub-magnetic gap 21 is not reduced. In addition, the magnetic fluid 16 is not agitated, and thus it is possible to attempt improvement in acoustic conversion efficiency and improvement in sound quality.
In addition, a magnetic gradient that changes a magnetic force with respect to the magnetic fluid 16 by changing a magnetic flux density is formed in the axial direction of the center pole portion 11. Thus, it is possible to attempt further improvement in acoustic conversion efficiency and further improvement in sound quality.
Further, a minimum value Samin of a magnetic flux density in the circumferential direction is larger than a value corresponding to half a maximum value Tamax of the magnetic flux density in the axial direction. Thus, when the coil bobbin 14 is changed, the magnetic fluid 16 to be scattered is reliably held in the sub-magnetic gap 21 from the gaps 21a, 21a, . . . , and scattering of the magnetic fluid 16 may be reliably prevented.
In addition, a saturated magnetic flux of the magnetic fluid 16 is set to 30 mT to 40 mT, and a viscosity of the magnetic fluid 16 is set to 300 cp or less. Thus, scattering is prevented, and an output of excellent reproduced sound in the speaker device 1 may be ensured without change of the coil bobbin 14 being suppressed by the magnetic fluid 16.
When the magnetic flux change units 22a, 22a, . . . or the magnetic flux change units 11x, 11x, . . . , which form a magnetic gradient in the circumferential direction of the center pole portion 11, are formed on the inner circumferential surface of the sub-plates 22 and 22A or the outer circumferential surface of the center pole portions 11A and 11B, structures of the sub-plates 22 and 22A and the center pole portions 11A and 11B are not complicated, and it is possible to attempt improvement in acoustic conversion efficiency and improvement in sound quality after ensuring simplified structures.
In addition, when the magnetic flux change units 12, 12A, and 12B or the magnetic flux change units 12C, 12D, and 12E, which form magnetic gradients in the axial direction of the center pole portions 11, 11A, and 11B, are formed on the sub-plates 22, 22D, and 22E or in the center pole portions 11, 11A, and 11B, structures of the sub-plates 22, 22D, and 22E or the center pole portions 11, 11A, and 11B are not complicated, and it is possible to attempt improvement in acoustic conversion efficiency and improvement in sound quality after ensuring simplified structures.
Further, when the magnetic flux change units 12, 12A, 12B, 12C, 12D, and 12E are provided by causing distal end portions of the center pole portions 11, 11A, and 11B to protrude in the axial direction from the sub-plate 22 or disposing the front surface of the center pole portion 11 on rear sides of the front surfaces of the sub-plates 22, 22D, and 22E, the magnetic flux change units 12, 12A, 12B, 12C, 12D, and 12E may be easily provided.
Furthermore, since the support ring is attached to the inner circumferential portion of the sub-plate, stability of centering effect may be improved.
In addition, the main magnetic gap 13 is preferably positioned on a side of the vibration plate 18 from the sub-magnetic gap 21. In this case, the voice coil 15 is positioned on a side of the vibration plate 18. Thus, the sub-magnetic gap 21 may not be made large to prepare for assembly (insertion) of the coil bobbin 14, and improvement in magnetic flux density may be attempted.
Effects described in this specification are illustrative rather than restrictive, and another effect may be present.
The technology may employ the following configurations.
(1)
A speaker device including:
a magnet having a central axis;
a yoke having a central axis, the central axis of the yoke being identical to the central axis of the magnet, the magnet being attached to the yoke;
a main plate attached to the magnet;
at least one sub-plate attached to the magnet and positioned to be separated from the main plate in an axial direction of the central axis;
a coil bobbin formed in a tubular shape and changeable in the axial direction;
a voice coil wound around an outer circumferential surface of the coil bobbin, at least a portion of the voice coil being disposed in a main magnetic gap formed between the main plate and the yoke;
a vibration plate having an inner circumferential portion connected to the coil bobbin, and vibrating according to a change of the coil bobbin; and
a magnetic fluid filling at least one sub-magnetic gap formed between the sub-plate and the yoke,
wherein a through-hole positioned in the sub-magnetic gap filled with the magnetic fluid is formed in the coil bobbin.
(2)
The speaker device according to (1), wherein a magnetic gradient is formed to change a magnetic force with respect to the magnetic fluid by changing a magnetic flux density in the axial direction.
(3)
The speaker device according to (1) or (2), wherein a magnetic gradient is formed to change a magnetic force with respect to the magnetic fluid by changing a magnetic flux density in a circumferential direction of the central axis.
(4)
The speaker device according to any of (1) to (3), wherein the through-hole is formed at a position allowing a flow of the magnetic fluid between the sub-plate and the yoke in a variation range of the coil bobbin in the axial direction.
(5)
The speaker device according to any of (1) to (4),
wherein a plurality of through-holes is formed to be separated from one another in a circumferential direction of the coil bobbin, and
positions of the plurality of through-holes are shifted in the axial direction.
(6)
The speaker device according to any of (1) to (5),
wherein the through-hole has a slit shape extending in the axial direction of the coil bobbin, and a plurality of through-holes is formed to be separated from one another in a circumferential direction of the coil bobbin, and
positions of the plurality of through-holes are shifted in the axial direction.
(7)
The speaker device according to any of (1) to (6), wherein the main magnetic gap is positioned on a side of the vibration plate from the sub-magnetic gap.
(8)
The speaker device according to any of (1) to (7),
wherein the sub-magnetic gap is positioned on a side of the vibration plate from the main magnetic gap,
a support ring is attached to an inner circumferential portion of the sub-plate, and
at least a portion of the support ring is positioned inside the inner circumferential surface of the sub-plate.
(9)
The speaker device according to (8), wherein the support ring corresponds to a magnetic substance.
(10)
The speaker device according to any of (1) to (9), wherein a saturated magnetic flux of the magnetic fluid is set to 30 mT to 40 mT, and a viscosity of the magnetic fluid is set to 300 cp or less.
(11)
The speaker device according to any of (3) to (10), wherein a magnetic flux change unit forming the magnetic gradient in the axial direction is provided in the sub-plate or the yoke.
(12)
The speaker device according to (11), wherein a distal end portion of the yoke is caused to protrude from the sub-plate in the axial direction, and the distal end portion is provided as the magnetic flux change unit.
(13)
The speaker device according to (11) or (12), wherein an inclined plane inclined in the axial direction is formed on a surface of the sub-plate or the yoke, and a portion on which the inclined plane is formed is provided as the magnetic flux change unit.
(14)
The speaker device according to any of (11) to (13), wherein a curved surface is formed on a surface of the sub-plate or the yoke, and a portion on which the curved surface is formed is provided as the magnetic flux change unit.
(15)
The speaker device according to any of (3) to (10), wherein a magnetic flux change unit forming the magnetic gradient in the axial direction is provided in the sub-plate and the yoke.
(16)
The speaker device according to (15), wherein an inclined plane inclined in the axial direction is formed on respective surfaces of the sub-plate and the yoke, and respective portions on which the inclined plane is formed are provided as the magnetic flux change unit.
(17)
The speaker device according to (15) or (16), wherein a curved surface is formed on a surface of the sub-plate or the yoke, and a portion on which the curved surface is formed is provided as the magnetic flux change unit.
(18)
The speaker device according to any of (1) to (17),
wherein a plurality of lead wires connected to the voice coil is provided, and
the plurality of lead wires is symmetrically disposed about a central axis of the coil bobbin.
(19)
The speaker device according to any of (1) to (18),
wherein a plurality of lead wires connected to the voice coil, and at least one connecting wire connected to the coil bobbin are provided, and
the plurality of lead wires and the connecting wire are symmetrically disposed about the central axis.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2014-013523 | Jan 2014 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2015/050914 | 1/15/2015 | WO | 00 |
