Double-sided voice coil bone conduction loudspeaker

Abstract

The utility model provides a double-face voice coil bone conduction loudspeaker. The double-face voice coil bone conduction loudspeaker comprises a support, an elastic piece, two voice coils and two vibration assemblies. The elastic piece is arranged at the middle point of the height of the support in an injection molding mode and located in the support. And the two voice coils are symmetrically arranged by taking the middle point of the height of the bracket as the center, are respectively positioned at the opposite ends of the elastic sheet, and are positioned in the bracket. The two vibration assemblies are symmetrically arranged about the middle point of the height of the support, the two vibration assemblies are connected with the opposite faces of the elastic piece in an attached mode respectively, the two vibration assemblies are located in the support, and one vibration assembly is arranged on one voice coil in a sleeved mode. The driving force is improved through the structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of loudspeakers, in particular to a double-sided voice coil bone conduction loudspeaker. BACKGROUND

[0002] Bone conduction is a way of perceiving sound different from traditional air conduction, which bypasses the outer ear and middle ear and directly transmits sound waves through the skull to the cochlea, causing the liquid in the cochlea to fluctuate and trigger auditory signals. Therefore, even if the tympanic membrane or ear ossicles are damaged (such as conductive hearing impairment), as long as the cochlea and auditory nerve function normally, the user can still clearly perceive sound through bone conduction. The bone conduction loudspeaker is designed based on this principle.

[0003] The existing bone conduction loudspeaker has the problem of small volume and narrow frequency response caused by insufficient driving force of a single voice coil, therefore, a double-sided voice coil bone conduction loudspeaker with improved driving force is needed. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a double-sided voice coil bone conduction loudspeaker with improved driving force to solve the above problems.

[0005] Embodiments of the present application provide a double-sided voice coil bone conduction loudspeaker, comprising:

[0006] a support;

[0007] a spring piece injection molded at the midpoint of the height of the support and located inside the support;

[0008] two voice coils symmetrically arranged at the midpoint of the height of the support and respectively located at opposite ends of the spring piece and inside the support;

[0009] two vibration assemblies symmetrically arranged at the midpoint of the height of the support and respectively connected with opposite surfaces of the spring piece and located inside the support, and one of the voice coils is sleeved with one of the vibration assemblies.

[0010] In at least one embodiment of the present application, the two vibration assemblies are respectively a first vibration assembly and a second vibration assembly, the first vibration assembly is connected with one surface of the spring piece, the second vibration assembly is connected with the other surface opposite to the one surface of the spring piece, and the first vibration assembly and the second vibration assembly are symmetrically arranged along the midpoint of the height of the support.

[0011] In at least one embodiment of the present application, the two voice coils are respectively a first voice coil and a second voice coil, the first voice coil is located at one end inside the support, the second voice coil is located at the other end opposite to the one end inside the support, the first voice coil is close to one surface of the spring piece, and the second voice coil is close to the other surface of the spring piece.

[0012] In at least one embodiment of the present application, the first voice coil cover is arranged on the first vibration assembly, the second voice coil cover is arranged on the second vibration assembly, and the first voice coil is connected to the support in a manner of being attached to one side of the first voice coil away from the first vibration assembly, and the second voice coil is connected to the support in a manner of being attached to one side of the second voice coil away from the second vibration assembly.

[0013] In at least one embodiment of the present application, the vibration assembly is sequentially connected by the first weight, the magnet and the second weight.

[0014] In at least one embodiment of the present application, the first weight is glued to the elastic sheet.

[0015] The elastic sheet, the first weight, the magnet and the second weight are glued into an integrated structure.

[0016] In at least one embodiment of the present application, the elastic sheet is embedded in the support.

[0017] In at least one embodiment of the present application, the double-sided voice coil bone conduction speaker is in any one of a circular shape, a ring shape, an oval shape or a racetrack shape.

[0018] In at least one embodiment of the present application, when the double-sided voice coil bone conduction speaker is in a circular shape, the support, the elastic sheet, the voice coil and the vibration assembly are centrally overlapped in the height direction of the support.

[0019] In at least one embodiment of the present application, the double-sided voice coil bone conduction speaker further comprises:

[0020] A face cover is arranged on one bottom surface of the support and attached to one of the two voice coils, and the face cover is located at one end of the voice coil away from the vibration assembly.

[0021] A front cover is arranged on another bottom surface of the support and attached to another of the two voice coils, and the front cover is located at one end of the voice coil away from the vibration assembly.

[0022] The double-sided voice coil bone conduction speaker provided above breaks through the bottleneck of single voice coil driving force by symmetrically arranging double voice coils and double vibration assemblies at the height midpoint of the support, using two voice coils to drive independent vibration assemblies to generate collaborative vibration, and realizing coupling and efficient transmission of vibration energy through the elastic sheet. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a perspective view of a double-sided voice coil bone conduction speaker according to the present application;

[0024] Figure 2 A top view of the double-sided voice coil bone conduction loudspeaker described in the present application;

[0025] Figure 3 A top view of the double-sided voice coil bone conduction loudspeaker described in the present application; Figure 2 A sectional view in A-A;

[0026] Figure 4 An exploded schematic view of the bracket, the voice coil and the vibration assembly described in the present application;

[0027] Figure 5 An exploded view of the double-sided voice coil bone conduction loudspeaker described in the present application;

[0028] Figure 6 A top view of the double-sided voice coil bone conduction loudspeaker described in the present application; Figure 3 An enlarged view of the partial view at B;

[0029] Main component symbol explanation

[0030] 100, double-sided voice coil bone conduction loudspeaker; 10, bracket; 20, spring sheet; 30, voice coil; 31, first voice coil; 32, second voice coil; 40, vibration assembly; 41, first vibration assembly; 42, second vibration assembly; 43, first counterweight; 44, magnet; 45, second counterweight; 50, face cover; 60, front cover; F1, bracket height direction. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0032] It should be noted that when one component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a middle component. When one component is considered to be "provided on" another component, it can be directly provided on the other component or there can be a middle component. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and the like used herein are for illustrative purposes only.

[0033] The embodiments of the present application provide a double-sided voice coil bone conduction loudspeaker, which comprises a bracket, a spring sheet, two voice coils and two vibration assemblies. The spring sheet is injection molded at the midpoint of the height of the bracket, and the spring sheet is located in the bracket. The two voice coils are symmetrically arranged at the midpoint of the height of the bracket, and the two voice coils are respectively located at opposite ends of the spring sheet, and the two voice coils are located in the bracket. The two vibration assemblies are symmetrically arranged at the midpoint of the height of the bracket, and the two vibration assemblies are respectively connected in close contact with opposite surfaces of the spring sheet, and the two vibration assemblies are located in the bracket, and one of the voice coils is sleeved with one of the vibration assemblies.

[0034] The two voice coils are symmetrically arranged at the midpoint of the height of the support, and the two voice coils are used to drive the independent vibration assemblies to generate collaborative vibration, and the vibration energy is coupled and efficiently transmitted through the elastic sheet, thereby breaking through the single voice coil driving force bottleneck. The symmetric double-drive structure increases the vibration area, optimizes the consistency of the vibration direction and the balanced force output, and significantly improves the vibration intensity and frequency response range of the loudspeaker.

[0035] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] Please refer to Figures 1-6 The embodiments of the present application provide a double-sided voice coil bone conduction loudspeaker 100, which includes a support 10, an elastic sheet 20, two voice coils 30, and two vibration assemblies 40. The elastic sheet 20 is injection molded at the midpoint of the height of the support 10, and the elastic sheet 20 is located inside the support 10. The two voice coils 30 are symmetrically arranged at the midpoint of the height of the support 10, and the two voice coils 30 are respectively located at the opposite ends of the elastic sheet 20, and the two voice coils 30 are located inside the support 10. The two vibration assemblies 40 are symmetrically arranged at the midpoint of the height of the support 10, and the two vibration assemblies 40 are respectively connected to the opposite surfaces of the elastic sheet 20, and the two vibration assemblies 40 are located inside the support 10. One voice coil 30 is sleeved with one vibration assembly 40.

[0037] The support 10 can be metal or high-strength plastic (such as ABS, PC, or aluminum alloy), which is internally hollow to accommodate other components. The support 10 carries key components such as the elastic sheet 20, the voice coil 30, and the vibration assembly 40, and provides structural strength and mounting reference; and ensures the symmetry and stable installation between components to avoid displacement.

[0038] The elastic sheet 20 is made of metal such as stainless steel, titanium alloy, or flexible high polymer material such as PI or PET, and is fixed at the midpoint of the vertical height of the support 10 by an injection mold. The elastic sheet 20 serves as a central support structure. The elastic sheet 20 connects and couples the two vibration assemblies 40 on both sides to form “push-pull” collaborative vibration. The elastic sheet 20 provides elastic restoring force to control the vibration direction within a predictable range.

[0039] The midpoint installation of the elastic sheet 20 makes the system symmetrical and force balanced, reduces eccentric vibration, and improves output efficiency and direction consistency.

[0040] The first voice coil 31 is mounted on one end of the upper surface of the elastic sheet 20, and the second voice coil 32 is mounted on the other end of the lower surface, and the two are symmetrically arranged along the height direction F1 of the support. The voice coil 30 generates electromagnetic driving force with the magnetic circuit of the vibration assembly 40 after being energized. The two voice coils 30 are synchronously or reversely driven (push / pull), forming a cooperative vibration. The combination of the first voice coil 31 and the second voice coil 32 solves the problem of small volume and low frequency response of the traditional single voice coil 30. And enhance the vibration driving force and sensitivity, especially in the low frequency to improve significantly.

[0041] The input ends of the first voice coil 31 and the second voice coil 32 are respectively led out, and then short-circuited by welding at the pads. When connected in parallel, the total impedance is reduced, which is suitable for low-voltage and large-current driving. Synchronous response is realized, which is beneficial to cooperative driving vibration. The two voice coils 30 have high vibration synchronization. The driving efficiency is better, which is suitable for small high-power sound generating devices. And it is convenient to access the Bluetooth mainboard or audio drive module unified output.

[0042] The upper and lower layers of the FPC can also be welded to the first and second voice coils 32 respectively. The circuit can be pre-fabricated as a parallel or series circuit structure. It can be attached to the panel in the form of perforated welding, SMT pad, back adhesive fixing, etc. Thus, the space is saved, and the degree of assembly automation is improved. And the FPC has high flexibility, which is suitable for three-dimensional space structure or curved equipment.

[0043] The vibration assembly 40 is composed of a first counterweight 43, a magnet 44 and a second counterweight, and is glued in turn by epoxy glue or hot melt glue. Two vibration assemblies 40 are respectively attached to the two surfaces of the elastic sheet 20, and are sleeved with the corresponding voice coil 30.

[0044] The vibration assembly 40 is an excitation element, which together with the voice coil 30 forms a driving unit. The structure of the two counterweights and the magnet 44 can enhance the inertia and the magnetic field strength, improve the driving efficiency of the voice coil 30, and tightly couple the vibration assembly 40 and the elastic sheet 20 to realize efficient conduction of sound wave vibration to the user's skeleton.

[0045] The two vibration assemblies 40 form a symmetrical "double-end driving" structure, with short vibration path, concentrated power, rapid vibration response, high energy coupling efficiency, and solve the problem of energy loss.

[0046] The voice coil 30 is sleeved around the outer circle of the magnet 44 to form a sleeved structure, which is usually formed by "inner magnetic outer coil winding" or "outer magnetic inner coil winding".

[0047] One voice coil 30 is sleeved with one vibration assembly 40 to ensure that the electromagnetic force and the center of the vibration assembly 40 are collinear, and form a stable Lorentz driving path, reduce the deviation and nonlinear response, and ensure that the moving coil system efficiency is maximized.

[0048] When the input audio electrical signal is input, the two voice coils 30 receive the first current and the second current respectively, and generate corresponding first Lorentz force and first Lorentz force with the magnets 44 in the vibration assembly 40 respectively.

[0049] The first voice coil 31 pushes the first vibration assembly 41 to move in the positive direction, and the second voice coil 32 pushes the second vibration assembly 42 to move in the negative direction, which can be regarded as a push-pull structure.

[0050] The elastic sheet 20 acts as a transmission bridge and is elastically deformed slightly under the force of the two voice coils 30, so that the left and right vibration energies are coupled and balanced with each other. The two vibration assemblies 40 jointly act on the external structure of the support 10 or contact the human body, and directly transmit the vibration to the skeleton and then to the cochlea.

[0051] In a specific embodiment, the two vibration assemblies 40 are respectively a first vibration assembly 41 and a second vibration assembly 42, the first vibration assembly 41 is connected in close contact with one surface of the elastic sheet 20, and the second vibration assembly 42 is connected in close contact with the other surface opposite to the one surface of the elastic sheet 20, and the first vibration assembly 41 and the second vibration assembly 42 are symmetrically arranged along the midpoint of the height of the support 10.

[0052] Each vibration assembly 40 is composed of three layers of structures, i.e., a first counterweight 43, a permanent magnet or magnet 44 and a second counterweight 45, which can be formed by epoxy resin gluing, and the shape can be circular, cylindrical or elliptical.

[0053] The first counterweight 43 of the first vibration assembly 41 is fixedly connected in close contact with one surface of the elastic sheet 20, and the optional close contact mode is surface contact, which can improve the energy coupling efficiency. The electromagnetic thrust generated by the first voice coil 31 directly acts on the first vibration assembly 41 and is transmitted to the elastic sheet 20 through close contact. Energy leakage or displacement error is avoided, and fast vibration response, good directivity and low distortion are realized.

[0054] The second vibration assembly 42 has the same structure as the first vibration assembly 41 and is mirror-installed on the other surface of the elastic sheet 20 to realize double-sided close contact, and the second vibration assembly 42 and the first vibration assembly 41 are symmetrically arranged.

[0055] The two vibration assemblies 40 are mirror-symmetrically placed with the vertical height direction center line of the support 10 as the axis. The two vibration assemblies 40 are basically completely matched in terms of mass center, stress point and vibration frequency, so as to realize dynamic balance in structure and reduce the "swing effect" or deflection response.

[0056] In a specific embodiment, the two voice coils 30 are a first voice coil 31 and a second voice coil 32, the first voice coil 31 is located at one end of the support 10, the second voice coil 32 is located at the other end opposite to the one end of the support 10, the first voice coil 31 is close to one side of the elastic sheet 20, and the second voice coil 32 is close to the other side of the elastic sheet 20.

[0057] Specifically, the two voice coils 30 are electromagnetic driving elements, and the winding mode can be spiral winding or flat spiral coil. The two voice coils 30 and the corresponding vibration assembly 40 form a driving subsystem. It allows to control the output frequency / amplitude / phase of each vibrator respectively, which improves the tuning flexibility of the system. The two voice coils 30 realize symmetric, independent and collaborative driving, which enhances the response ability of the system.

[0058] The first voice coil 31 and the second voice coil 32 are respectively located at the upper and lower two end faces of the support 10 in the height direction. The voice coil 30 is fixed in the inner cavity wall of the support 10 in a surface pasting manner, and UV glue or buckle design can be used.

[0059] The first voice coil 31 is fixed opposite to the first vibration assembly 41. The second voice coil 32 is fixed opposite to the second vibration assembly 42

[0060] The voice coil 30 and the magnet 44 form a closed magnetic field path, so that the first voice coil 31 exerts force on the first vibration assembly 41, and the second voice coil 32 exerts force on the second vibration assembly 42, thereby constructing a complete push-pull driving mechanism.

[0061] In a specific embodiment, the vibration assembly 40 is sequentially glued and connected by a first counterweight 43, a magnet 44 and a second counterweight 45.

[0062] Specifically, the first counterweight 43 is located at one end of the vibration assembly 40 structure, which is usually a metal block such as tungsten steel, copper or stainless steel. The magnet 44 is located in the middle, which is usually a high-performance permanent magnet of neodymium iron boron (NdFeB). The second counterweight 45 is installed on the other side of the magnet 44, which is axially symmetric with the first counterweight 43. The three are bonded into a whole by gluing, and the gluing material can be selected from epoxy glue, UV glue or heat-conducting silicone. The bonding surface needs to be flat and tightly pressed, and after curing, it forms a whole rigid body.

[0063] In another embodiment, the first counterweight 43 can also be removed from the vibration assembly 40, thereby increasing the thickness of the magnet 44 and allowing the magnet 44 to be glued to the elastic sheet 20 to form a surface contact.

[0064] Removing the first counterweight 43 can reduce the number of parts of the bone conduction speaker, reduce the structure thickness, and also provide a more compact module size to adapt to smaller devices such as hearing aids and ear clips. It can also release space to accommodate a larger magnet 44, thereby enhancing the magnetic field strength.

[0065] Magnet 44 becomes part of the direct drive vibration and transmission structure, and the Lorentz force generated by the voice coil 30 drives the magnet 44 as a whole. Since the magnet 44 is directly connected to the elastic sheet 20, the vibration transmission path is reduced by one level, and the energy loss is lower.

[0066] In a specific embodiment, the first counterweight 43 is glued to the elastic sheet 20. The elastic sheet 20, the first counterweight 43, the magnet 44, and the second counterweight 45 are glued into an integral molding.

[0067] Specifically, the U-shaped iron with a large volume ratio of the integral molding structure is removed and replaced by two counterweight blocks clamping the magnet 44, realizing a smaller and thinner bone conduction speaker. The internal space of the bone conduction speaker is optimized,

[0068] In a specific embodiment, after injection molding, the elastic sheet 20 is embedded in the support 10.

[0069] In a specific embodiment, the double-sided voice coil bone conduction speaker 100 is provided in any shape of a circle, a ring, an ellipse, or a racetrack.

[0070] Specifically, when the double-sided voice coil bone conduction speaker 100 is provided in a circular shape, the support 10, the voice coil 30, the elastic sheet 20, and the vibration assembly 40 are provided in a matching circular shape.

[0071] When the double-sided voice coil bone conduction speaker 100 is provided in a ring shape, the support 10, the voice coil 30, the elastic sheet 20, and the vibration assembly 40 are provided in a matching ring shape.

[0072] When the double-sided voice coil bone conduction speaker 100 is provided in an elliptical shape, the support 10, the voice coil 30, the elastic sheet 20, and the vibration assembly 40 are provided in a matching elliptical shape.

[0073] When the double-sided voice coil bone conduction speaker 100 is provided in a racetrack shape, the support 10, the voice coil 30, the elastic sheet 20, and the vibration assembly 40 are provided in a matching racetrack shape.

[0074] In a specific embodiment, when the double-sided voice coil bone conduction speaker 100 is provided in a circular shape, the support 10, the elastic sheet 20, the voice coil 30, and the vibration assembly 40 are centered and overlapped in the height direction F1 of the support.

[0075] Specifically, the voice coil 30, the elastic sheet 20, the support 10, and the vibration assembly 40 are designed with the center of the circle as the reference point. The circular structure facilitates the realization of a symmetrical magnetic field distribution. It is beneficial to uniform vibration, improve directional consistency, and improve wearing adaptability. It is easy to realize central symmetry of the magnetic circuit and mechanics, and avoid polarization or split mode.

[0076] In a specific embodiment, the face cover 50 and the front cover 60 are both PCB panels, and the face cover 50 and the front cover 60 are both arranged on the two bottom surfaces of the support 10 to form a closed mounting space, and the front cover 60 is provided with a through hole for external power connection of the bone conduction speaker.

[0077] Therefore, the double-sided voice coil bone conduction speaker 100 provided above breaks through the driving force bottleneck of the single voice coil 30 by symmetrically arranging the double voice coils 30 and the double vibration assemblies 40 at the height midpoint of the support 10, using the two voice coils 30 to drive the independent vibration assemblies 40 to generate collaborative vibration, and realizing the coupling and efficient transmission of vibration energy through the elastic sheet 20, thereby significantly improving the vibration intensity and frequency response range of the speaker.

[0078] The above only describes the embodiments of the present application, and it should be noted that those skilled in the art can make improvements without departing from the creative concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A dual-sided voice coil bone conduction loudspeaker, characterized in that, It comprises: a bracket; a spring embedded in the middle of the height of the bracket; two voice coils symmetrically arranged at the middle of the height of the bracket and respectively located at opposite ends of the spring and in the bracket; two vibration assemblies symmetrically arranged at the middle of the height of the bracket and respectively connected with opposite surfaces of the spring, one of the voice coils being sleeved with one of the vibration assemblies.

2. The dual-sided voice coil bone conduction loudspeaker of claim 1, wherein, The two vibration assemblies are respectively a first vibration assembly and a second vibration assembly, the first vibration assembly being connected with one surface of the spring, and the second vibration assembly being connected with the other surface of the opposite surface of the spring, the first vibration assembly and the second vibration assembly being symmetrically arranged along the middle of the height of the bracket.

3. The dual-sided voice coil bone conduction loudspeaker of claim 2, wherein, The two voice coils are respectively a first voice coil and a second voice coil, the first voice coil being located at one end in the bracket, the second voice coil being located at the other end opposite to the one end in the bracket, the first voice coil being close to one surface of the spring, and the second voice coil being close to the other surface of the spring.

4. The dual-sided voice coil bone conduction loudspeaker of claim 3, wherein, The first voice coil is sleeved with the first vibration assembly, and the second voice coil is sleeved with the second vibration assembly, one surface of the first voice coil away from the first vibration assembly being connected with the bracket, and one surface of the second voice coil away from the second vibration assembly being connected with the bracket.

5. The dual-sided voice coil bone conduction loudspeaker of claim 1, wherein, The vibration assembly is sequentially connected with a first weight, a magnet and a second weight.

6. The dual-sided voice coil bone conduction loudspeaker of claim 5, wherein, The first weight is connected with the spring. The spring, the first weight, the magnet and the second weight are integrally formed.

7. The dual-sided voice coil bone conduction loudspeaker of claim 1, wherein, The spring is embedded in the bracket.

8. The dual-sided voice coil bone conduction loudspeaker of claim 1, wherein, The double-sided voice coil bone conduction speaker is in any shape of a circle, a ring, an ellipse or a racetrack.

9. The dual-sided voice coil bone conduction loudspeaker of claim 1, wherein, When the double-sided voice coil bone conduction speaker is in a circular shape, the bracket, the spring, the voice coil and the vibration assembly are centrally overlapped in the height direction of the bracket.

10. The dual-sided voice coil bone conduction loudspeaker of claim 1, wherein The double-sided voice coil bone conduction speaker further comprises: a face cover arranged on one bottom surface of the bracket and connected with one of the voice coils, the face cover being located at one end of the voice coil away from the vibration assembly; a front cover arranged on the other bottom surface of the bracket and connected with the other of the voice coils, the front cover being located at one end of the voice coil away from the vibration assembly.

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