Bone conduction loudspeaker with multiple structural diaphragms

Abstract

The bone conduction loudspeaker comprises a base and a vibration assembly, the base is a cavity with an elastic sheet at the bottom, an annular voice coil is arranged on the upper wall, far away from the elastic sheet, of the base, and the vibration assembly comprises a support, an elastic membrane, U iron and a magnetic circuit assembly; the bottom end of the support is connected with the upper end of the base, the elastic membrane is composed of a plurality of sheet bodies arranged at intervals, the upper end of the elastic membrane is connected with the top end of the support, the U iron is a cavity with an opening in the lower end, the lower end of the elastic membrane is connected with the periphery of the top wall of the U iron, and the magnetic circuit assembly is arranged in the cavity. The bottom wall of the magnetic circuit assembly is connected with the upper wall of the elastic sheet, a magnetic circuit gap is arranged between the outer peripheral wall of the magnetic circuit assembly and the inner peripheral wall of the U-iron, the voice coil is located in the magnetic circuit gap, the vibration frequency of the vibration assembly is more stable due to the arrangement of the double-elastic structure, and then the vibration balance of the vibration assembly in the axial direction is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of bone conduction speakers, and particularly to a bone conduction speaker with a multi-piece diaphragm structure. Background Art

[0002] Bone conduction is a sound conduction method, that is, converting sound into mechanical vibrations of different frequencies, and transmitting sound waves through the human skull, bony labyrinth, endolymph of the inner ear, spiral organ, and auditory center.

[0003] However, the existing bone conduction speakers mainly include two factors: vibration frequency and amplitude, that is, vibration amplitude and vibration frequency. By controlling different vibrations of the vibrating plate through a transducer, it is then converted into high, medium, and low frequencies.

[0004] However, the existing bone conduction speakers generally only have one voice coil and a diaphragm, so the corresponding vibration frequency and amplitude will be limited. It can be understood that when the vibration frequency is wider, the sound quality is more delicate; when the amplitude is wider, the scale is wider (when the amplitude exceeds a predetermined value, it may cause distortion or decibel attenuation).

[0005] Therefore, to avoid overclocking of bone conduction headphones, for example, Chinese Patent 202322604566.2, it adopts a double-diaphragm structure, thereby ensuring the balance of the vibration component, avoiding sound quality distortion, and improving the sound quality effect of bone conduction headphones. However, this structure generally has a high production cost. Summary of the Utility Model

[0006] The main purpose of the utility model is to propose a bone conduction speaker with a multi-piece diaphragm structure, aiming to ensure the vibration balance of the vibration component of the bone conduction headphone through the multi-diaphragm structure, avoid the problem of overclocking, and effectively improve the sound quality of the bone conduction headphone.

[0007] To achieve the above purpose, the utility model proposes a bone conduction speaker with a multi-piece diaphragm structure, including:

[0008] A base, the base is a cavity 30 with a diaphragm at the bottom, and a ring-shaped voice coil is provided on the upper wall of the base away from the diaphragm;

[0009] A vibration component, the vibration component includes a bracket, an elastic diaphragm, a U-shaped iron, and a magnetic circuit component;

[0010] The bottom end of the bracket is connected to the upper end of the base, the elastic diaphragm is composed of a plurality of spaced-apart sheet bodies, and the upper end of the elastic diaphragm is connected to the top end of the bracket.

[0011] The U-shaped iron has a cavity 30 with an opening at the lower end. The lower end of the elastic diaphragm is connected to the outer periphery of the top wall of the U-shaped iron. The magnetic circuit assembly is disposed within the cavity 30, and the bottom wall of the magnetic circuit assembly is connected to the upper wall of the elastic piece.

[0012] A magnetic circuit gap is provided between the outer peripheral wall of the magnetic circuit assembly and the inner peripheral wall of the U-shaped iron. The voice coil is located within the magnetic circuit gap.

[0013] In actual design, the elastic diaphragm and the elastic piece enable the vibration assembly to have a predetermined vibration amplitude. At the same time, the setting of the double-elastic structure makes the vibration frequency of the vibration assembly more stable, thus ensuring the vibration balance in the axial direction of the vibration assembly, effectively avoiding the problem of over-frequency, and effectively improving the sound quality of the bone conduction speaker.

[0014] The elastic diaphragm composed of multiple spaced-apart sheet bodies can not only ensure the stability of vibration but also avoid vibration imbalance caused by excessive restraint. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view of the present invention;

[0016] Figure 2 is an exploded view of the present invention;

[0017] Figure 3 is a three-dimensional schematic diagram of the elastic diaphragm;

[0018] Figure 4 is a three-dimensional schematic of the present invention Figure 1 ;

[0019] Figure 5 is a three-dimensional schematic of the present invention Figure 2 .

[0020] In the figure,

[0021] 1 is the base, 10 is the support surface, 11 is the elastic piece, 12 is the voice coil,

[0022] 2 is the bracket, 20 is the elastic diaphragm, 21 is the inner ring, 22 is the outer ring, 23 is the sheet body,

[0023] 3 is the U-shaped iron, 30 is the cavity 30,

[0024] 4 is the magnetic circuit assembly, 40 is the magnetic circuit gap, 41 is the washer, 42 is the magnet,

[0025] 5 is the pressing piece,

[0026] 6 is the riveting post. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0029] In addition, if there are descriptions such as "first" or "second" involved in the embodiments of the present utility model, then such descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0030] As Figures 1 to 5 shown, a bone conduction speaker with a multi - sheet structure diaphragm includes:

[0031] A base 1, the base 1 is a cavity 30 with a shrapnel 11 provided at the bottom, and an annular voice coil 12 is provided on the upper wall of the base 1 away from the shrapnel 11;

[0032] A vibration assembly, the vibration assembly includes a bracket 2, an elastic diaphragm 20, a U - shaped iron 3, and a magnetic circuit assembly 4;

[0033] The bottom end of the bracket 2 is connected to the upper end of the base 1, the elastic diaphragm 20 is composed of a plurality of spaced - apart sheet bodies 23, and the upper end of the elastic diaphragm 20 is connected to the top end of the bracket 2,

[0034] The U - shaped iron 3 is a cavity 30 with an opening at the lower end, the lower end of the elastic diaphragm is connected to the outer periphery of the top wall of the U - shaped iron 3, the magnetic circuit assembly 4 is arranged in the cavity 30, and the bottom wall of the magnetic circuit assembly 4 is connected to the upper wall of the shrapnel 11.

[0035] A magnetic path gap 40 is provided between the outer peripheral wall of the magnetic path component 4 and the inner peripheral wall of the U-shaped iron 3, and the voice coil 12 is located within the magnetic path gap 40.

[0036] In actual design, through the elastic diaphragm and the shrapnel 11, the vibration component has a predetermined vibration amplitude. At the same time, the setting of the double elastic structure makes the vibration frequency of the vibration component more stable, thereby ensuring the vibration balance in the axial direction of the vibration component, effectively avoiding the problem of over-frequency, and effectively improving the sound quality of the bone conduction speaker.

[0037] The elastic diaphragm composed of multiple spaced-apart sheet bodies 23 can not only ensure the stability of vibration but also avoid vibration imbalance caused by excessive restraint.

[0038] A gasket 100 is further provided between the shrapnel and the washer.

[0039] Specifically, the base 1 and the shrapnel 11 are integrally injection-molded. In actual design, the shrapnel 11 is preferably made of aluminum alloy material and integrally injection-molded with the plastic base 1, thereby reducing the installation steps.

[0040] In the embodiment of the present invention, a support surface 10 is provided on the lower wall of the base 1, and the shrapnel 11 is arranged on the support surface 10; the voice coil 12 is provided on the upper wall of the support surface 10, which facilitates assembly.

[0041] Specifically, the shrapnel 11 and the base 1 are integrally injection-molded, thereby ensuring the stability of production.

[0042] In the embodiment of the present invention, the U-shaped iron 3, the magnetic path component 4, and the shrapnel 11 are respectively provided with through holes that correspond to each other. There is at least one through hole, and after the riveting posts 6 pass through the through holes one by one, the U-shaped iron 3, the magnetic path component 4, and the shrapnel 11 are fixed together. The fixing method using the riveting posts 6 can ensure the axial correspondence of the speaker, reduce the misalignment between the voice coil 12 and the magnetic path gap 40 caused by assembly errors, and effectively improve the sound quality of the speaker.

[0043] Specifically, the shrapnel 11 is in an elliptical shape, and two riveting posts 6 are spaced apart. When the speaker is circular, one riveting post 6 can also be provided.

[0044] In the embodiment of the present invention, the elastic diaphragm includes an inner ring 21, an outer ring 22, and a plurality of sheet bodies 23 arranged between the inner ring 21 and the outer ring 22. An avoidance groove is provided between adjacent sheet bodies 23, and the inner ring 21 and the outer ring are arranged with a height offset, thereby providing a predetermined deformation range (of course, the sheet bodies can also be set individually without the need to set the inner ring and the outer ring, but the assembly will be more complicated).

[0045] Specifically, the cross-section of the sheet body 23 is wavy, that is, it is composed of multiple arc surfaces, which can ensure both the vibration frequency and the amplitude.

[0046] In the embodiment of the present invention, the magnetic circuit assembly 4 includes a magnet disposed on the top wall of the U-shaped iron 3 and a washer 41 disposed on the lower wall of the magnet 42.

[0047] Specifically, a pressing sheet 5 that fits with the top wall of the U-shaped iron is provided on the upper wall of the inner ring 21, thereby realizing the connection between the U-shaped iron and the elastic diaphragm. In addition to the bonding method, the above-mentioned riveting posts 6 can also be integrally connected, thereby reducing the assembly process.

[0048] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A bone conduction speaker with a multi - sheet structure diaphragm, characterized in that, Comprising: A base, the base being a cavity with shrapnel provided at the bottom, and a ring-shaped voice coil being provided on the upper wall of the base away from the shrapnel; A vibration assembly, the vibration assembly including a bracket, an elastic diaphragm, a U-shaped iron, and a magnetic circuit assembly; The bottom end of the bracket is connected to the upper end of the base, the elastic diaphragm is composed of a plurality of spaced-apart sheet bodies, and the upper end of the elastic diaphragm is connected to the top end of the bracket. The U-shaped iron is a cavity with an opening provided at the lower end, the lower end of the elastic diaphragm is connected to the outer periphery of the top wall of the U-shaped iron, the magnetic circuit assembly is disposed in the cavity, and the bottom wall of the magnetic circuit assembly is connected to the upper wall of the shrapnel. A magnetic circuit gap is provided between the outer peripheral wall of the magnetic circuit assembly and the inner peripheral wall of the U-shaped iron, and the voice coil is located in the magnetic circuit gap.

2. The bone conduction speaker with a multi-piece structural diaphragm according to claim 1, characterized in that: The base and the shrapnel are integrally injection-molded.

3. The bone conduction speaker with a multi-piece structured diaphragm according to claim 1, characterized in that: The lower wall of the base is provided with a support surface, and the shrapnel is disposed on the support surface; The voice coil is provided on the upper wall of the support surface.

4. The bone conduction speaker with a multi-piece structural diaphragm according to claim 2, wherein: The shrapnel and the base are integrally injection-molded.

5. The bone conduction speaker with a multi-piece structured diaphragm according to claim 1, characterized in that: The U-shaped iron, the magnetic circuit assembly, and the shrapnel are respectively provided with through holes corresponding to each other, at least one through hole is provided, and rivet posts pass through the through holes one by one to fix the U-shaped iron, the magnetic circuit assembly, and the shrapnel.

6. The bone conduction loudspeaker with a multi-piece structural diaphragm according to claim 5, characterized in that: The shrapnel is in an elliptical shape, and two rivet posts are spaced apart.

7. The bone conduction speaker with a multi-piece structured diaphragm according to claim 5, characterized in that: The elastic diaphragm includes an inner ring, an outer ring, and a plurality of sheet bodies disposed between the inner ring and the outer ring. An avoidance groove is provided between adjacent sheet bodies, and the inner ring and the outer ring are offset in the height direction.

8. The bone conduction speaker with a multi-piece structured diaphragm according to claim 5, characterized in that: The cross section of the sheet body is in a wavy shape.

9. The bone conduction speaker with a multi-piece structured diaphragm according to claim 5, characterized in that: The magnetic circuit assembly includes a magnet disposed on the top wall of the U-shaped iron and a washer disposed on the lower wall of the magnet.

10. The bone conduction speaker with a multi-piece structural diaphragm according to claim 7, characterized in that: A pressing piece that fits with the upper wall of the U-shaped iron is provided on the upper wall of the inner ring.

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