CN212344049U

CN212344049U - Sound production device

Info

Publication number: CN212344049U
Application number: CN202021112353.8U
Authority: CN
Inventors: 李�杰; 赵国栋; 李轲
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-01-12
Anticipated expiration: 2030-06-16

Abstract

The utility model discloses a sound production device, which comprises a vibration system and a magnetic circuit system, wherein the vibration system comprises a vibration diaphragm and a voice coil which is combined with the vibration diaphragm, the magnetic circuit system forms a magnetic gap, the voice coil extends into the magnetic gap, and the vibration diaphragm comprises a vibration part which is positioned in the center and a bending ring part which is arranged around the vibration part and has a convex structure; the vibration part is provided with an extension part which is convexly arranged towards the magnetic gap direction; the upper end of the voice coil is connected with the lower end of the extension part. The utility model provides a sound generating mechanism acoustic performance is better.

Description

Sound production device

Technical Field

The utility model relates to an electroacoustic conversion technical field, in particular to sound generating mechanism.

Background

The miniature sound producing device is an important electroacoustic conversion component in mobile communication equipment, is used for converting an electric signal into sound, and is used for forming parts of a loudspeaker, a receiver, an earphone and the like of the mobile communication equipment. With the development of the mobile communication equipment industry, the miniature sound generating device industry is rapidly developed, and the requirement on the performance of the miniature sound generating device is higher and higher.

Wherein, moving coil formula sound generating mechanism is a specific sound generating mechanism structure of wide application in the mobile communication equipment, and current moving coil formula sound generating mechanism includes the shell usually and accepts vibration system and the magnetic circuit who is fixed in on the shell, and wherein, vibration system includes vibrating diaphragm and voice coil loudspeaker voice coil, and magnetic circuit forms the magnetic gap in order to accept the voice coil loudspeaker voice coil, lets in behind the electric current in the voice coil loudspeaker voice coil, and the voice coil loudspeaker voice coil atress vibration under the effect in magnetic field of magnetic circuit, and then drives the vibrating diaphragm vibration sound production.

However, for the moving-coil sound generating device with the above-mentioned conventional structure, because the voice coil is in direct contact with the bottom of the diaphragm, the position of the voice coil in the magnetic gap cannot be freely adjusted, most of the structure of the voice coil is located above the position of the dense magnetic induction line region, the driving force factor BL value (the length L of the conducting wire with a certain number of turns is multiplied by the magnetic flux density B in unit area) is not high, the magnetic field cannot be fully utilized, mainly, the magnetic field utilization rate is low when the voice coil vibrates upwards, which causes the driving force imbalance when the voice coil vibrates upwards, the symmetry of the BL curve is poor, which further causes the amplitude symmetry of the vibration system to be poor, the distortion of the sound generating device is high, and the sensitivity is not.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the problems in the prior art are overcome, and the sound production device with better acoustic performance is provided.

In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a sound generating mechanism, includes vibration system and magnetic circuit, vibration system include the vibrating diaphragm and with the voice coil loudspeaker voice coil that the vibrating diaphragm combines, magnetic circuit forms the magnetic gap, the voice coil loudspeaker voice coil stretches into in the magnetic gap, its characterized in that:

the vibrating diaphragm comprises a vibrating part positioned in the center and a bending ring part of a convex structure arranged around the vibrating part;

the vibration part is provided with an extension part which is convexly arranged towards the magnetic gap direction;

the upper end of the voice coil is connected with the lower end of the extension part.

Preferably, the extension portion is integrally formed with the vibration portion.

Preferably, the vibrating portion and the extending portion are made of a metal material.

Preferably, the metal material is one of aluminum, aluminum magnesium alloy, aluminum lithium alloy and titanium alloy.

Preferably, the vibrating part and the extending part are made of rigid plastic materials or carbon fiber materials; wherein the rigid plastic material is one of PET, PEI, PEN and PI.

Preferably, the vibrating portion has an outer edge portion fixed to the edge of the corrugated portion; the extension part is formed by punching and bending a part of the vibration part, which is positioned at the inner side of the outer edge part.

Preferably, the thickness of the vibrating portion and the extending portion is 0.3mm or less.

Preferably, the extension portion is formed by locally thickening the vibrating portion.

Preferably, the extension portion is an annular plate material bonded to the vibration portion.

Preferably, the annular plate is made of a metal material, and the metal material is one of aluminum, aluminum-magnesium alloy, aluminum-lithium alloy and titanium alloy; or the annular plate is made of a rigid plastic material or a carbon fiber material.

Preferably, the width of the extension part is gradually reduced from top to bottom; alternatively, the width of the extension portions may be uniform up and down.

Preferably, the convex structure of the folded ring part is arranged downwards; the voice coil bottom is provided with right the voice coil carries out elastic support's centering structure, centering structure distributes four bights of voice coil loudspeaker voice coil.

After the technical scheme is adopted, the beneficial effects of the utility model are that:

the utility model discloses a sound generating mechanism, be equipped with the extension that sets up towards the protrusion of magnetic gap direction on the vibration portion of vibrating diaphragm, be used for being connected with the upper end of voice coil loudspeaker voice coil, through above-mentioned structural design, under the unchangeable circumstances in vibrating diaphragm position, the position of voice coil loudspeaker voice coil in the magnetic gap can freely be adjusted through the height of adjusting the extension, make the voice coil loudspeaker voice coil structure be located the intensive region of line of magnetic induction as far as possible, improve the magnetic field utilization ratio when magnetic field utilization ratio especially voice coil loudspeaker voice coil upwards vibrates, the curved symmetry of BL has been improved, drive power when making the voice coil loudspeaker voice coil vibrate from top to bottom more tends towards the balance, and then the amplitude symmetry that has improved vibration system, the especially low-frequency distortion of sound generating mechanism's distortion has.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is an exploded schematic view of a sound generating device according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a sound generating device according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of the structure of FIG. 2;

FIG. 4 is a schematic diagram showing the comparison between BL (X) curves of the sound generating device of the present invention and the sound generating device of the prior art;

FIG. 5 is a schematic diagram showing the comparison between the vibration displacement curves of the sound generating device of the present invention and the sound generating device of the prior art;

fig. 6 is a schematic diagram comparing the loudness test curves (SPL curves) of the sound generating device of the present invention and the sound generating device of the prior art at different frequencies;

fig. 7 is a schematic diagram comparing the harmonic distortion test curve of the sound generating device of the present invention and the sound generating device of the prior art.

The reference numbers illustrate:

1. the magnetic yoke comprises a magnetic yoke 21, a central magnet 22, a central magnetic conduction plate 31, an edge magnet 32, an edge magnetic conduction plate 4, a vibrating diaphragm 41, a vibrating part 42, a corrugated ring part 5, an extension part 6, a voice coil 7 and a centering support piece.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a sound generating mechanism, this sound generating mechanism can be arranged in the electronic equipment that can sound production such as earphone, cell-phone.

Referring to fig. 1-3, the sound generating device specifically includes a vibration system and a magnetic circuit system, where the magnetic circuit system includes a magnetic yoke 1, and an inner magnetic circuit portion and an outer magnetic circuit portion disposed on the magnetic yoke 1, and a magnetic gap is formed between the inner magnetic circuit portion and the outer magnetic circuit portion, in this embodiment, the inner magnetic circuit portion includes a central magnet 21 and a central magnetic conductive plate 22 disposed on the central magnet 21, and the outer magnetic circuit portion includes a side magnet 31 surrounding the central magnet 21 and a side magnetic conductive plate 32 disposed on the side magnet 31, in this embodiment, the side magnet 31 is provided with four pieces, and in other embodiments, the magnetic circuit system is not limited to the above design. Vibration system include vibrating diaphragm 4 and with voice coil 6 that vibrating diaphragm 4 combines, voice coil 6 stretches into in the magnetic gap, vibrating diaphragm 4 is including the vibration portion 41 that is located central authorities and encircleing the dog-ear portion 42 of the protruding structure that vibration portion 41 set up, and vibration portion 41's rigidity is big, and the quality is light for produce sound radiation, dog-ear portion 42 is used for elastic suspension vibration portion 41 takes place deformation when vibration portion 41 vibrates. After current is introduced into the voice coil 6, the voice coil 6 is stressed and vibrates under the action of the magnetic field of the magnetic circuit system, and then the vibrating diaphragm 4 is driven to vibrate and sound.

The utility model discloses in, be equipped with the orientation on the vibration portion 41 extension 5 that the magnetic gap direction protrusion set up, the upper end of voice coil loudspeaker voice coil 6 with the lower extreme of extension 5 is connected.

Under the unchangeable condition in vibrating diaphragm 4 positions, can freely adjust the position of voice coil loudspeaker voice coil 6 in the magnetic gap through the height of adjusting extension 5, make 6 structures of voice coil loudspeaker voice coil be located the intensive region of line of magnetic induction as far as possible, improve the magnetic field utilization ratio when magnetic field utilization ratio especially voice coil loudspeaker voice coil 6 upwards vibrates, the symmetry of BL curve has been improved, drive power when making voice coil loudspeaker voice coil 6 vibrate from top to bottom tends towards the equilibrium more, and then improved vibration system's amplitude symmetry, the distortion especially low frequency distortion of sound generating mechanism has effectively been reduced, the sensitivity of sound generating mechanism has been improved, sound generating mechanism's acoustic performance has wholly been promoted.

Referring to fig. 4 and the following table 1, fig. 4 is a schematic diagram comparing bl (x) curves of the sound generating device of the present embodiment and the sound generating device of the prior art, and table 1 is data related to the two curves in fig. 4. Simulation results show that, compared with the prior art, the BL value of the sound generating device in this embodiment when the diaphragm 4 vibrates upwards is significantly increased compared with the prior art, and the structure of this embodiment improves the magnetic field utilization rate. And the difference of BL values when the vibrating diaphragm 4 vibrates upwards and downwards becomes smaller, thereby effectively improving the symmetry of the BL curve.

Table 1:

referring to fig. 5, fig. 5 is a schematic diagram illustrating a comparison between vibration displacement curves of the sound generating device of the present embodiment and a sound generating device of the prior art. With the value of 0 on the ordinate as the symmetry axis, in the prior art, the amplitude of the upward vibration of the diaphragm 4 is significantly lower than the amplitude of the downward vibration of the diaphragm 4 at different frequencies, and the amplitude symmetry is poor. Compared with the prior art, on the basis of improving the symmetry of the BL curve, the amplitude of the vibrating diaphragm 4 in the upward vibration process is improved, and the amplitude of the vibrating diaphragm 4 in the downward vibration process is reduced, so that the overall amplitude symmetry of the vibration system is better.

Fig. 6 is a schematic diagram comparing the test curves (SPL curves) of loudness of the sound generating apparatus of the present embodiment with different frequencies of the sound generating apparatus of the prior art, and is shown in fig. 6 and 7; fig. 7 is a comparison diagram of harmonic distortion test curves of the sound generating device of the present embodiment and the sound generating device of the prior art. As can be seen from fig. 6, compared with the prior art, the sound generating apparatus of the present embodiment is higher than the prior art in the sound pressure level of the full frequency band, so that the present embodiment can enhance the acoustic sensitivity of the full frequency band of the sound generating apparatus, and has a higher loudness. As can be seen from FIG. 7, the THD (total harmonic distortion) of the sound generating device of the present embodiment is significantly lower than that of the prior art before 1KHz, and the sound quality of the sound generating device of the present embodiment is better.

In the selection of the material of the diaphragm 4, the vibrating portion 41 is usually made of a material with high rigidity, hard texture and relatively low density, which has a large influence on the high-frequency performance of the sound generating device, and the material is selected from aluminum, aluminum alloy, carbon fiber, rigid plastic or a composite structure of the above material and a foaming material, and the like. The bending ring part 42 is usually made of a material which is soft and elastic, has a large influence on the low-medium frequency performance of the sound generating device, and is made of a single-layer or composite structure containing PEEK, TPU, TPEE, silica gel, rubber and the like.

The extension portion 5 also needs to be made of a material with certain rigidity and light weight, so that the vibration portion 41 and the bending portion 42 can be reliably connected on the one hand, and the overall mass of the vibration system is not greatly affected. Therefore, the extension portion 5 is adapted to be disposed on the vibrating portion.

As shown in fig. 2 and 3, in the present embodiment, the extension portion 5 and the vibration portion 41 are integrally formed, so that the integrally formed structure does not add extra parts and assembly processes, and the manufacturing cost is low.

Preferably, the vibrating portion 41 and the extending portion 5 are made of a metal material. Specifically, one of aluminum, aluminum-magnesium alloy, aluminum-lithium alloy, titanium alloy, or other known metal materials that can be realized may be selected. In the case that the vibrating portion 41 is made of a metal material, the process of integrally forming the extending portion 5 is relatively easy and highly feasible, and in order to achieve light weight, the thickness of the metal material vibrating portion 41 is generally very thin, and the extending portion 5 integrally formed on the vibrating portion 41 with a thin structure can also meet the performance requirements of the extending portion.

Specifically, the thickness of the vibrating portion 41 and the extending portion 5 may be 0.3mm or less, or may be made thinner, for example, 0.1mm or less.

In the case of a metal material, a simple and quick way of forming is to form the extension 5 by stamping and bending the vibration part 41. Specifically, the vibrating portion 41 has an outer edge portion fixed to the folded ring portion 42; the extension portion 5 is formed by press-bending a portion of the vibrating portion 41 located inside the outer edge portion. With the structure, the extension part 5 is connected to the vibration part 41 through the bending parts on two sides in a molding manner, so that the integral strength is high, and the voice coil can be reliably supported.

In other embodiments, the material of the vibrating portion 41 and the extending portion 5 may also be a rigid plastic material or a carbon fiber material; wherein, the rigid plastic material can be one of PET, PEI, PEN, PI, etc. When the rigid plastic material is thermoplastic, the extension portion 5 may be formed by heating, pressing, and bending a portion of the vibrating portion 41 located inside the outer edge portion.

The extension portion 5 may be formed by locally thickening the vibration plate 41, for example, by integrally forming a thickened portion in the injection molding process of the vibration portion 41 to form the extension portion 5, instead of being formed by press bending. Alternatively, the extension portion 5 is an annular plate material bonded to the vibration portion 41.

The annular plate may be made of a metal material, specifically, one of aluminum, aluminum-magnesium alloy, aluminum-lithium alloy and titanium alloy may be selected, or other light known metal materials may be used. Or the annular plate is made of a rigid plastic material or a carbon fiber material. The annular plate material may be the same as or different from the material of the vibrating plate.

Referring to fig. 3, in this embodiment, the extension portion 5 has a structure with a uniform width, and is simple to manufacture. Of course, in other embodiments, the width of the extension portion 5 may also be gradually reduced from top to bottom to form an approximately trapezoidal structure, the support strength of the extension portion 5 is better, the support for the voice coil 6 is more stable, and the vibration system is not prone to generate a polarization phenomenon. Of course, the shape of the extension 5 is not limited to the two designs described above.

Further, in this embodiment, the protruding structure of the folded ring portion 42 is disposed downward, and this structure can reduce the height of the sound generating device, which is beneficial to the thin design. On the basis of the above structure, since the bending ring part 42 protrudes downward, it is inconvenient to provide a centering structure above the voice coil 6, and therefore, in the embodiment, the bottom of the voice coil 6 is provided with a centering structure for elastically supporting the voice coil 6. In this embodiment, the centering structures are disposed at four corners of the voice coil 6 and are disposed in the gaps formed between the side magnets 31, and in this embodiment, the centering structures are centering pads 7 made of FPCB material having cantilevers.

The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.

Claims

1. The utility model provides a sound generating mechanism, includes vibration system and magnetic circuit, vibration system include the vibrating diaphragm and with the voice coil loudspeaker voice coil that the vibrating diaphragm combines, magnetic circuit forms the magnetic gap, the voice coil loudspeaker voice coil stretches into in the magnetic gap, its characterized in that:

2. A sound-generating device as claimed in claim 1, wherein said extension portion is integrally formed with said vibrating portion.

3. The sound generating apparatus as claimed in claim 2, wherein the vibrating portion and the extending portion are made of metal.

4. A sound generating device as claimed in claim 3, wherein said metal material is one of aluminium, aluminium magnesium alloy, aluminium lithium alloy and titanium alloy.

5. The sound generating apparatus as claimed in claim 2, wherein the vibrating portion and the extending portion are made of a rigid plastic material or a carbon fiber material;

wherein the rigid plastic material is one of PET, PEI, PEN and PI.

6. The sound generating apparatus as claimed in any one of claims 2 to 5, wherein said vibrating portion has an outer edge portion to which said corrugated portion is fixed;

the extension part is formed by punching and bending a part of the vibration part, which is positioned at the inner side of the outer edge part.

7. A sound-generating apparatus as claimed in claim 3, wherein the thickness of said vibrating portion and said extending portion is 0.3mm or less.

8. A sound-generating apparatus as claimed in claim 1, wherein said extension is formed by locally thickening said vibrating portion.

9. The sound generating apparatus of claim 8, wherein said extension is an annular plate bonded to said vibrating portion.

10. The sounding device according to claim 9, wherein the annular plate is made of a metal material, and the metal material is one of aluminum, aluminum-magnesium alloy, aluminum-lithium alloy and titanium alloy;

or the annular plate is made of a rigid plastic material or a carbon fiber material.

11. A sound-generating device as claimed in claim 1, wherein the width of said extension portion decreases from top to bottom;

alternatively, the width of the extension portions may be uniform up and down.

12. The sound generating apparatus as claimed in claim 1, wherein the raised structure of said collar portion is downwardly disposed;

the voice coil bottom is provided with right the voice coil carries out elastic support's centering structure, centering structure distributes four bights of voice coil loudspeaker voice coil.