The present disclosure relates to the technical field of electro acoustic products, and particularly to a vibration sound-generating device in a portable electronic apparatus.
Vibration sound generating devices are multi-functional acoustic devices and have the function of a vibration motor in addition to the vibration sound-generating function of an ordinary speaker. Vibration sound-generating devices, by combining the functions of two important components (speaker and vibration motor) in the original portable electronic apparatuses, not only simplify the assembling process of portable electronic apparatuses, but also effectively save the internal space of portable electronic apparatuses and reduce the production costs of portable electronic apparatuses. Hence, the vibration sound-generating device simultaneously having sound-generating function and vibration function is applied to the field of portable electronic apparatuses more and more extensively.
At present, the vibration sound-generating device applied to portable electronic apparatuses comprises a vibration system and a magnetic circuit system. The vibration system comprises a vibrating diaphragm and a barrel-shaped voice coil integrally engaged with vibrating diaphragm. The magnetic circuit system comprises a magnet and a magnetic gap, and the barrel-shaped voice coil is disposed in the magnetic gap. When the vibration sound-generating device operates, the barrel-shaped voice coil, upon the reception of the action of Lorentz force, vibrates in the vertical direction and hereby drives a vibrating diaphragm to vibrate and generate a sound in the vertical direction, and the magnetic circuit system receives a reacting force, generates resonance in the vertical direction and thereby implements the sound-generating function and vibration function. Since the barrel-shaped voice coil occupies a large space and meanwhile requires the magnetic circuit system to reserve the magnetic gap for it and further requires to reserve a vibration space in the vertical direction, the current vibration sound-generating devices all have a large thickness and cannot satisfy the development requirements for slimness and miniaturization of portable electronic apparatuses. Meanwhile, due to existence of the magnetic gap, the size of the magnet is made small, so the magnetic field intensity is made small and the Lorentz force received by the voice coil in the magnetic field is made small, and thereby that causes a low acoustic sensitivity of the vibration sound-generating device, and a weak vibration feeling and an undesirable overall performance. That is very difficult to satisfy people's higher and higher consumption demands for portable electronic apparatuses. Furthermore, the current vibration sound-generating devices are complicated in structure, difficult to assemble and lower in production efficiency.
In view of the above defects, the technical problem to be solved by the present disclosure is to provide a vibration sound-generating device which exhibits a small thickness, good performance, easy assembling and high production efficiency.
To solve the above technical problems, the present disclosure employs the following technical solutions:
A vibration sound-generating device comprises a housing and a vibration system and a magnetic circuit system received in the housing, a sound exit hole being provided on a side surface of the housing, wherein the vibration system comprises a vibrating diaphragm, a voice coil and a voice coil framework for connecting the vibrating diaphragm with the voice coil, and a plane where the vibrating diaphragm lies is parallel to a side surface where the sound exit hole lies; and the voice coil is of a flat structure, and a plane where the voice coil lies is perpendicular to the plane where the vibrating diaphragm lies; the magnetic circuit system comprises magnets, and a plane where the magnets lie is parallel to the plane where the voice coil lies; the vibration sound-generating device further comprises a mass block and an elastic support, the magnets and the mass block are fixed as an integral structure, and the elastic support suspends the mass block and the magnets in the housing; and the elastic support is an annular structure, the mass block and the magnets are located inside the elastic support, two opposed sides of the elastic support are fixedly connected with the magnets, an extension direction of the two sides is perpendicular to a vibration direction of the mass block and the magnets, and the other two sides of the elastic support are fixed on the housing.
Preferably, a position where the elastic support is fixedly connected with the magnets is located at a central location of the two sides, and a spacing between the two sides at the central location is smaller than a spacing between their two ends.
Preferably, two adjacent sides of the elastic support are connected via an arcuate transition.
Preferably, a pallet is provided between central locations of two sides where the elastic support is fixedly connected with the magnets, and two ends of the pallet are individually fixedly connected with lower edges of the two sides.
Preferably, the elastic support is comprised of two elastic sheets of identical structure, the two elastic sheets are disposed symmetrically and connected as one piece via the pallet, and an external shape of the elastic support is approximately two M shapes snap-fitted to each other.
Preferably, a positioning slot is disposed at a location underside the mass block corresponding to the pallet, and the pallet is snap-fitted in the positioning slot.
Preferably, the voice coil framework is a sheet-shaped structure, the voice coil is fixed on the voice coil framework, the vibrating diaphragm is provided with an insertion boss protruding towards the voice coil, the insertion boss is provided with a receptacle orifice, and an end of the voice coil framework is inserted and fixed in the receptacle orifice.
Preferably, the housing comprises an upper housing and a lower housing, the upper housing and one side of the lower housing are connected into one piece via a side cover, and the sound exit hole is disposed on the side cover; and the vibrating diaphragm comprises a bent ring portion engaged with the side cover by injection molding and a reinforcing portion fixed in the middle of the bent ring portion, and the insertion boss is located on the reinforcing portion.
Preferably, the voice coil framework comprises two sheets of the framework which are identically structured and disposed symmetrically, and both ends of the voice coil are respectively fixed on the two sheets of the framework; and the two sheets of the framework are both printed with a circuit, one end of each of the two sheets of the framework is fixed with the vibrating diaphragm in a plugged manner, the other end is provided with a connecting portion electrically connected with an external circuit, a fixing portion for fixing the voice coil is connected with the plugged connection end, and the fixing portion is connected with the connecting portion via an elastic connecting arm.
Preferably, the magnets comprise two magnets, the mass block located between the two magnets is provided with a limiting raised ridge for isolating the two magnets, and an extension direction of the limiting raised ridge is perpendicular to its vibration direction; and the position on the mass block where the limiting raised ridge is provided protrudes out of both ends of the mass block in an extension direction of the limiting raised ridge, and a limiting block for preventing the magnets and the mass block from rising is disposed above the protruding positions corresponding to the two ends of the mass block.
Preferably, a hollow-out is provided at an arcuate transition connection between two adjacent sides of the elastic support.
By employing the above technical solutions, the present disclosure achieves the following advantageous effects:
Of the present disclosure, the sound exit hole of the vibration sound-generating device is disposed on the side surface, the plane where the vibrating diaphragm lies is parallel to the side surface where the sound exit hole lies, the voice coil is of a flat structure, and the plane where the voice coil lies is perpendicular to the plane where the vibrating diaphragm lie. The plane where the magnets lie is parallel to the plane where the voice coil lies. The vibration sound-generating device further comprises a mass block and an elastic support, the magnets and the mass block are fixed as an integral structure, and the elastic support suspends the mass block and the magnets in the housing. The two sides where the extension direction of the elastic support is perpendicular to the vibration direction are fixed with the magnets, and the other two sides are fixed on the housing. When alternating current is introduced into the voice coil, the voice coil receives the Lorentz force in the horizontal direction in the magnetic field generated by the magnets, thereby the voice coil vibrates in the horizontal direction and the voice coil framework drives the vibrating diaphragm to generate a sound. According to the acting force-reacting force principle of the magnetic field, the magnets receive an acting force in the opposite direction in the same magnitude. Within certain frequencies, the magnets and the mass block jointly vibrate reciprocatingly in the horizontal direction, thereby achieving the vibration function of the vibration sound-generating device. Based on the above structure of the vibration sound-generating device and the working principle of vibration in the horizontal direction of the present disclosure, the vibration sound-generating device of the present disclosure has the following advantages as compared with the vibration sound-generating device which vibrates in the vertical direction in the prior art:
1) The vibration sound-generating device of the present invention has a small thickness and can satisfy the slimness-oriented development requirement of portable electronic apparatuses;
2) The sizes of magnets are large, the magnetic field intensity is large, the acoustic flexibility is high, the vibration feeling is strong, the overall use performance is good, which can satisfy people's increasing consumption demands;
3) The vibration sound-generating device of the present disclosure can avoid the obstruction of the sound exit hole and ensure the sound exit effect when the portable electronic apparatus does not have a sufficient thickness; and
4) The magnets and the mass block are fixed with the housing via the elastic support, so the assembling process is simple and the production efficiency is high.
As a position where the elastic support is fixedly connected with the magnets is located at a central location of the two sides, a spacing between the two sides at the central location is smaller than a spacing between their two ends. That is, the elastic support has a narrowed middle portion, which design facilitates the increase of the compliance of the elastic support and the decrease of the resonance frequency of the vibration sound-generating device.
Since there is an arcuate transition connection between the two adjacent sides of the elastic support, that is, the four corners of the elastic support all are arcuate bends, that can effectively control most of the x-direction vibration of the magnetic circuit within a linear region, and provide an x-axis restoration force with excellent symmetry when the magnetic circuit vibrates.
Since the pallet is disposed between the central locations of the two sides where the elastic support is fixedly connected with the magnets, two ends of the pallet are individually fixedly connected with lower edges of the two sides. The pallet functions to support the magnets and the mass block, which may effectively prevent the disengagement of the magnets and the mass block from the elastic support, improve the reliability of the vibration sound-generating device and effectively prolongs the service life of the vibration sound-generating device.
Since a positioning slot is disposed at a location underside the mass block corresponding to the pallet, and the pallet is snap-fitted in the positioning slot. The positioning slot functions for positioning purpose, and upon assembling, can effectively reduce the assembling difficulty and improve the assembling efficiency, and meanwhile can ensure the uniformity of products and improve the qualification rate of finished products.
Since a hollow-out is provided at each arcuate transition connection between two adjacent sides of the elastic support, that is, a hollow-out is provided at four corners of the elastic support, the solution can further boost the compliance of the elastic support and reduce the resonance frequency of the vibration sound-generating device.
To conclude, the vibration sound-generating device of the present disclosure solves the technical problems that the vibration sound-generating devices in the prior art have large thickness, large assembling difficulty and undesirable performance. The vibration sound-generating device of the present disclosure has advantages such as small thickness, good performance, simple structure, easy assembling and high production efficiency.
The above depictions are only generalization of technical solutions of the present disclosure. Specific embodiments of the present disclosure are presented below to make the technical means of the present disclosure clearer.
The drawings are used to provide further understanding of the present disclosure, constitute part of the description, illustrate the present disclosure together with the embodiments of the present disclosure, and do not constitute limitation of the present disclosure. In the drawings:
In the figures: the reference number 10 denotes upper housing, 100 damping hole, 102 notch, 12 lower housing, 14 side cover, 140 sound exit hole, 16 fixing member, 160 positioning post, 162 boss, 164 connecting member, 18 side frame, 20 anti-dust mesh, 22 damping mesh, 24 elastic pad, 30 reinforcing portion, 300 insertion boss, 302 receptacle orifice, 32 voice coil framework, 320 plug portion, 322 fixing portion, 3220 through hole, 324 connecting arm, 326 connecting portion, 3260 positioning aperture, 328 welding pad, 34 voice coil, 36 bent ring portion, 40 magnet, 42 mass block, 40 positioning slot, 422 limiting raised ridge, 424 protrusion, 44 limiting block, 440 engaging portion, 442 limiting portion, 46 elastic support, 460 first fixing portion, 426 second fixing portion, 464 pallet, 466a bent portion, 466b bent portion, 4660 hollow-out.
The present disclosure will be further illustrated with reference to the figures and the embodiments.
The orientation “upper” involved in the description refers to the direction of the vibration system, and the orientation “lower” refers to the direction of the magnetic circuit system. The “inside” involved in the description refers to the side adjacent to the center of the vibration sound-generating device, and the “outside” refers to the side away from the center.
Embodiment 1
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Embodiment 2
The present embodiment is substantially identical with Embodiment 1, and differs from Embodiment 1 as follows:
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When alternating current is introduced into the voice coil 34, the voice coil 34 is subjected to the action of Lorentz force in the magnetic field generated by the magnets 40. The magnetic lines of force generated by the magnets 40 perpendicularly pass through the voice coil 34. The voice coil 34 receives the Lorentz force in the horizontal direction according to the left-hand rule, and the voice coil 34 will vibrate in the horizontal direction and drive the vibrating diaphragm to vibrate and generate a sound. According to the acting force-reacting force principle, the magnets 40 receive an acting force in the opposite direction. Since the magnets 40 and the mass block 42 are suspended in the housing via the elastic support, when the voice coil 34 vibrates in the horizontal direction, the magnets 40 and the mass block 42 also vibrate in the horizontal direction and thereby perform the vibrating function.
With the voice coil in the conventional vibration sound-generating device being changed to a flat voice coil, and the conventional vibration in the vertical direction being changed to the vibration in the horizontal direction, the vibration sound-generating device of the present disclosure has advantages such as small thickness, good performance, simple structure, easy assembling and high production efficiency while achieving the sound-generation and vibration functions.
The naming of the first fixing portion and the second fixing portion involved in the description is only intended to distinguish the technical features and does not represent the positional relationship, assembling order and working order of the two.
The present disclosure is not limited to the above specific embodiments. Diverse variations made by those having ordinary skill in the art from the above concept without making any inventive efforts all fall within the protection scope of the present disclosure.
Number | Date | Country | Kind |
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2015 1 0528217 | Aug 2015 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/CN2015/096597 | 12/7/2015 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2017/031861 | 3/2/2017 | WO | A |
Number | Name | Date | Kind |
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9237390 | Gao | Jan 2016 | B2 |
Number | Date | Country |
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201995124 | Sep 2011 | CN |
103067834 | Apr 2013 | CN |
103067834 | Apr 2013 | CN |
Number | Date | Country | |
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20180220238 A1 | Aug 2018 | US |