Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a box body, a first vibrating diaphragm assembly, second vibrating diaphragm assemblies, an elastic framework, a voice coil, an elastic supporting component, a containing box and two groups of magnetic steel assemblies, the top and the bottom of the box body are each provided with a first window, the first windows are provided with the first vibrating diaphragm assemblies, and the two ends of the box body are each provided with a second window. The second window is provided with a second vibrating diaphragm assembly; each group of magnetic steel assembly comprises upper magnetic steel and lower magnetic steel which form a magnetic gap; the elastic framework comprises a frame-shaped deformable body and a mounting arm, the frame-shaped deformable body is connected with the two first vibrating diaphragm assemblies, and one end, far away from the frame-shaped deformable body, of the mounting arm penetrates through the magnetic gap and is connected with the second vibrating diaphragm assembly; a voice coil is wound on the mounting arm; the elastic supporting component is connected with the mounting arm and the box body; the containing box is arranged in the box body and arranged in the hollow area of the frame-shaped deformable body in a penetrating mode, and the containing box is filled with sound absorbing materials. The miniature loudspeaker is novel in structure, capable of sounding in all directions, good in acoustic performance, and especially excellent in low-frequency performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic converters, and in particular to a miniature loudspeaker. Background Art

[0002] At present, micro speakers, as audio devices, play an indispensable role in mobile terminals such as mobile phones and tablet computers. With the development of the times, consumers have higher and higher requirements for the sound quality and loudness of the whole machine, which also requires the performance of micro speakers to be further improved. For this reason, micro speakers with double-sided vibration sound have appeared on the market. However, the existing micro speakers with double-sided vibration sound have the problem of unsatisfactory performance. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a high-performance micro speaker.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a micro speaker, comprising:

[0005] A box body, wherein the top and the bottom of the box body are respectively provided with first windows, and both ends of the box body are respectively provided with second windows;

[0006] A first diaphragm assembly, the top and bottom of the box body are respectively provided with the first diaphragm assembly, and the first diaphragm assembly closes the first window;

[0007] A second diaphragm assembly, wherein the two ends of the box body are respectively provided with the second diaphragm assembly, and the second diaphragm assembly closes the second window;

[0008] Two groups of magnetic steel components, the magnetic steel components are arranged in the box body, the two groups of magnetic steel components are respectively arranged near the two ends of the box body, each group of magnetic steel components includes an upper magnetic steel and a lower magnetic steel with magnetic poles facing opposite directions, and a magnetic gap is formed between the upper magnetic steel and the lower magnetic steel;

[0009] An elastic skeleton, the elastic skeleton comprising a frame-shaped deformable body and a mounting arm, the frame-shaped deformable body connecting the two first diaphragm assemblies, the mounting arms being connected to the two sides of the frame-shaped deformable body, and one end of the mounting arm away from the frame-shaped deformable body passing through the magnetic gap and connecting the second diaphragm assembly;

[0010] A voice coil, each of the mounting arms is respectively wound with the voice coil;

[0011] An elastic supporting member, wherein the elastic supporting member connects the mounting arm and the box body;

[0012] A container box is arranged in the box body and penetrates the hollow area of ​​the frame-shaped deformation body. The container box is filled with sound absorbing material. The internal space of the container box is connected to the internal space of the box body.

[0013] In one embodiment, the mounting arms located on both sides of the frame-shaped deformation body are arranged in the same plane.

[0014] In one embodiment, the sound-absorbing material is sound-absorbing particles or sound-absorbing cotton.

[0015] In one embodiment, the frame-shaped deformation body includes an upper plate, a lower plate, a left deformation arm and a right deformation arm, the upper plate and the lower plate are arranged opposite to each other, the upper plate is connected to the first diaphragm assembly located at the top of the box body, and the lower plate is connected to the first diaphragm assembly located at the bottom of the box body, the left deformation arm and the right deformation arm are symmetrically arranged, the opposite sides of the upper plate portion are respectively connected to the top end of the left deformation arm and the top end of the right deformation arm, the opposite sides of the lower plate portion are respectively connected to the bottom end of the left deformation arm and the bottom end of the right deformation arm, and the middle part of the left deformation arm and the middle part of the right deformation arm are respectively connected to the mounting arms.

[0016] In one embodiment, the frame-shaped deformation body is a hexagonal deformation frame, and each corner of the hexagonal deformation frame is a thinned arc segment; the left deformable arm includes a left upper oblique arm and a left lower oblique arm, and the left upper oblique arm is connected to the left lower oblique arm through one of the thinned arc segments; the right deformable arm includes a right upper oblique arm and a right lower oblique arm, and the right upper oblique arm is connected to the right lower oblique arm through another thinned arc segment.

[0017] In one embodiment, the left deformation arm and the right deformation arm are both arc-shaped.

[0018] In one embodiment, the elastic frame is an integral structure formed by integral processing.

[0019] In one embodiment, the elastic frame is made of metal or plastic.

[0020] In one embodiment, the elastic support component is a centering support plate, each of the mounting arms is respectively connected to two of the elastic support components, the two centering support plates connected to the same mounting arm are symmetrically arranged, and the mounting arm is located between the two centering support plates connected thereto.

[0021] In one embodiment, the centering support plate includes an inner fixing portion, a cantilever portion and an outer fixing portion which are connected in sequence, the inner fixing portion is connected to the mounting arm, the top and bottom ends of the outer fixing portion are both connected to the box body, and the cantilever portion is located in the gap between the magnetic steel assembly and the box body.

[0022] The beneficial effects of the present invention are:

[0023] This micro speaker has a novel structure and a large total volume of internal magnetic steel. Most or even all areas of the voice coil can be in the effective magnetic gap, which makes the micro speaker have a very high BL value, so that the micro speaker has excellent acoustic performance and optimizes the listening experience; this micro speaker can emit sound from all sides, which further improves the acoustic performance of the micro speaker. The setting of sound-absorbing materials in the box can expand the virtual back cavity of the micro speaker product, thereby improving the low-frequency performance of the micro speaker. The presence of the elastic support component can effectively support the mounting arm, thereby preventing the deformation of the mounting arm from causing the second diaphragm assembly to shrink, which is beneficial to ensure the structural stability of the micro speaker and the stability of the acoustic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 is a cross-sectional view of a micro-speaker according to a first embodiment of the present invention;

[0026] Figure 2 is a structural schematic diagram of a part of the structure of a micro-speaker according to the first embodiment of the present invention;

[0027] Figure 3 is a front view of an elastic skeleton in a micro-speaker according to the first embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the elastic skeleton in the micro-speaker according to the second embodiment of the present invention.

[0029] Description of Figure Numbers:

[0030] 1. Box body; 11. First positioning wall; 12. Second positioning wall;

[0031] 21. a first diaphragm assembly; 22. a second diaphragm assembly;

[0032] 3. Elastic skeleton; 31. Frame-shaped deformation body; 311. Upper plate; 312. Lower plate; 313. Left deformation arm; 3131. Left upper oblique arm; 3132. Left lower oblique arm; 314. Right deformation arm; 3141. Right upper oblique arm; 3142. Right lower oblique arm; 315. Thinned arc segment; 32. Mounting arm;

[0033] 4. Voice coil;

[0034] 5. elastic support member; 51. inner fixing portion; 52. cantilever portion; 53. outer fixing portion;

[0035] 6. Container box; 61. Sound absorbing material; 62. Breathable partition;

[0036] 7. Magnetic steel assembly; 71. Upper magnetic steel; 72. Lower magnetic steel. DETAILED DESCRIPTION

[0037] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0041] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or and solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory 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 invention.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] Embodiment 1

[0044] Please refer to Figures 1 to 3 , Embodiment 1 of the present invention is: a micro speaker, comprising a box body 1, a first diaphragm assembly 21, a second diaphragm assembly 22, an elastic skeleton 3, a voice coil 4, an elastic supporting component 5, a container box 6 and two groups of magnetic steel assemblies 7, wherein the top and bottom of the box body 1 are respectively provided with a first window, and the two ends of the box body 1 are respectively provided with a second window, preferably, the first window at the top of the box body 1 is arranged opposite to the first window at the bottom of the box body 1, and the second windows at the two ends of the box body 1 are arranged opposite to each other; the top and bottom of the box body 1 are respectively provided with the first diaphragm assembly 21, and the first diaphragm assembly 21 closes the first window; the two ends of the box body 1 are respectively provided with the second diaphragm assembly 22, and the second diaphragm assembly 22 closes the second window; the magnetic steel assembly 7 is arranged in the box body 1, and the two groups of the magnetic steel assemblies 7 are respectively close to the two ends of the box body 1 It is arranged that each group of the magnetic steel components 7 includes an upper magnetic steel 71 and a lower magnetic steel 72 with magnetic poles facing opposite directions, and a magnetic gap is formed between the upper magnetic steel 71 and the lower magnetic steel 72; the elastic skeleton 3 includes a frame-shaped deformable body 31 and a mounting arm 32, the frame-shaped deformable body 31 connects the two first diaphragm components 21, and the mounting arms 32 are respectively connected to the two sides of the frame-shaped deformable body 31, and the ends of the mounting arms 32 away from the frame-shaped deformable body 31 pass through the magnetic gap and connect the second diaphragm component 22; the voice coil 4 is respectively wound around each of the mounting arms 32; the elastic supporting component 5 connects the mounting arms 32 and the box body 1; the container box 6 is arranged in the box body 1 and penetrates the hollow area of ​​the frame-shaped deformable body 31, the container box 6 is filled with sound-absorbing material 61, and the internal space of the container box 6 is connected to the internal space of the box body 1.

[0045] When the micro speaker is working, the voice coil 4 drives the mounting arm 32 to move along the X-axis direction, and the movement directions of the two mounting arms 32 are opposite, so that the frame-shaped deformation body 31 is deformed, thereby driving the first diaphragm assembly 21 to move along the Z-axis direction, and the second diaphragm assembly 22 to move along the X-axis direction, thereby achieving the effect of four-sided vibration and sound generation.

[0046] In this embodiment, the magnetic poles of the upper magnetic steels 71 in the two groups of magnetic steel assemblies 7 are oriented in opposite directions. Specifically, in the same group of magnetic steel assemblies 7, when the end of the upper magnetic steel 71 close to the lower magnetic steel 72 is the N pole, the end of the lower magnetic steel 72 close to the upper magnetic steel 71 is the S pole, and when the end of the upper magnetic steel 71 close to the lower magnetic steel 72 is the S pole, the end of the lower magnetic steel 72 close to the upper magnetic steel 71 is the N pole; in different groups of magnetic steel assemblies 7, when the end of one upper magnetic steel 71 close to the corresponding magnetic gap is the pole, the end of the other upper magnetic steel 71 close to the corresponding magnetic gap is the S pole.

[0047] In order to facilitate the positioning and installation of the upper magnetic steel 71 and ensure that the second diaphragm assembly 22 has sufficient vibration space, a first positioning wall 11 is provided in the box body 1, the first positioning wall 11 is arranged close to the second window, and the upper magnetic steel 71 is connected to the first positioning wall 11. Similarly, a second positioning wall 12 is provided in the box body 1, the second positioning wall 12 is arranged close to the second window, and the lower magnetic steel 72 is connected to the second positioning wall 12. In this embodiment, the first positioning wall 11 and the second positioning wall 12 are arranged in alignment.

[0048] In order to make the force of the frame-shaped deformable body 31 more balanced, the mounting arms 32 located on both sides of the frame-shaped deformable body 31 are arranged in the same plane. Specifically, the frame-shaped deformable body 31 includes an upper plate 311, a lower plate 312, a left deformable arm 313 and a right deformable arm 314. The upper plate 311 and the lower plate 312 are arranged opposite to each other. The upper plate 311 is connected to the first diaphragm assembly 21 located at the top of the box body 1, and the lower plate 312 is connected to the first diaphragm assembly 21 located at the bottom of the box body 1. The left deformable arm 313 and the right deformable arm 314 are arranged symmetrically. The opposite sides of the upper plate 311 are respectively connected to the top of the left deformable arm 313 and the top of the right deformable arm 314, and the opposite sides of the lower plate 312 are respectively connected to the bottom of the left deformable arm 313 and the bottom of the right deformable arm 314. The middle of the left deformable arm 313 and the middle of the right deformable arm 314 are respectively connected to the mounting arms 32.

[0049] In this embodiment, the frame-shaped deformation body 31 is a hexagonal deformation frame, which is a hexagonal frame that can be deformed. Each corner of the hexagonal deformation frame is a thinned arc segment 315. When the hexagonal deformation frame is deformed, the thinned arc segment 315 is the deformation area; the left side deformation arm 313 includes a left upper oblique arm 3131 and a left lower oblique arm 3132, and the left upper oblique arm 3131 is connected to the left lower oblique arm 3132 through a thinned arc segment 315, and the thinned arc segment 315 is connected to one of the mounting arms 32; the right side deformation arm 314 includes a right upper oblique arm 3141 and a right lower oblique arm 3142, and the right upper oblique arm 3141 is connected to the right lower oblique arm 3142 through another thinned arc segment 315, and the other thinned arc segment 315 is connected to another mounting arm 32. The six corner positions of the frame-shaped deformable body 31 are all thinned arc sections 315, which are conducive to the deformation of the frame-shaped deformable body 31. The six sides of the hexagonal deformation frame are not thinned, which can ensure the structural strength of the frame-shaped deformable body 31, so that the frame-shaped deformable body 31 can more effectively drive the first diaphragm assembly 21 to vibrate, thereby ensuring the working stability of the micro speaker.

[0050] Preferably, the thinned arc segment 315 is in an arc shape; and the hexagonal deformation frame is approximately a regular hexagonal frame structure when no force is applied.

[0051] In order to facilitate the processing and manufacturing of the elastic skeleton 3 and control its manufacturing cost, the elastic skeleton 3 is an integrated structure that is processed and formed in one piece. The elastic skeleton 3 is easy to deform and has a good elongation rate. The material of the elastic skeleton 3 can be either metal or plastic, and the specific selection can be made according to actual needs.

[0052] The sound-absorbing material 61 is sound-absorbing particles, sound-absorbing cotton or other materials capable of expanding the virtual back cavity. In detail, the container box 6 is fixedly connected to the box body 1, and a window is provided on the container box 6. In this embodiment, the sound-absorbing material 61 is sound-absorbing particles, and a breathable baffle 62 is provided at the window. The aperture of the air holes on the breathable baffle 62 is smaller than the particle size of the sound-absorbing particles, and the internal space of the container box 6 is connected to the internal space of the box body 1 through the air holes.

[0053] The elastic support component 5 is a centering support plate, and each of the mounting arms 32 is respectively connected to two of the elastic support components 5. The two centering support plates connected to the same mounting arm 32 are symmetrically arranged, and the mounting arm 32 is located between the two centering support plates connected thereto.

[0054] The centering support plate includes an inner fixing portion 51, a cantilever portion 52 and an outer fixing portion 53 which are connected in sequence, the inner fixing portion 51 is connected to the mounting arm 32, the top and bottom ends of the outer fixing portion 53 are both connected to the box body 1, and the cantilever portion 52 is located in the gap between the magnetic steel assembly 7 and the box body 1.

[0055] The centering support plate is an FPC soft board. Optionally, the centering support plate is electrically connected to the voice coil 4, and an external power supply supplies power to the voice coil 4 through the centering support plate.

[0056] Embodiment 2

[0057] See also Figure 4 Embodiment 2 of the present invention is a parallel technical solution of embodiment 1, and the only difference from embodiment 1 is that the specific structure of the frame-shaped deformation body 31 in the elastic skeleton 3 is different. In this embodiment, the left deformation arm 313 and the right deformation arm 314 of the frame-shaped deformation body 31 are both arc-shaped.

[0058] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A micro speaker, characterized in that: include A box body, wherein the top and the bottom of the box body are respectively provided with first windows, and both ends of the box body are respectively provided with second windows; A first diaphragm assembly, the top and bottom of the box body are respectively provided with the first diaphragm assembly, and the first diaphragm assembly closes the first window; A second diaphragm assembly, wherein the two ends of the box body are respectively provided with the second diaphragm assembly, and the second diaphragm assembly closes the second window; Two groups of magnetic steel components, the magnetic steel components are arranged in the box body, the two groups of magnetic steel components are respectively arranged near the two ends of the box body, each group of magnetic steel components includes an upper magnetic steel and a lower magnetic steel with magnetic poles facing opposite directions, and a magnetic gap is formed between the upper magnetic steel and the lower magnetic steel; An elastic skeleton, the elastic skeleton comprising a frame-shaped deformable body and a mounting arm, the frame-shaped deformable body connecting the two first diaphragm assemblies, the mounting arms being connected to the two sides of the frame-shaped deformable body, and one end of the mounting arm away from the frame-shaped deformable body passing through the magnetic gap and connecting the second diaphragm assembly; A voice coil, each of the mounting arms is respectively wound with the voice coil; An elastic supporting member, wherein the elastic supporting member connects the mounting arm and the box body; A container box is arranged in the box body and penetrates the hollow area of ​​the frame-shaped deformation body. The container box is filled with sound absorbing material. The internal space of the container box is connected to the internal space of the box body.

2. The micro-speaker according to claim 1, characterized in that: The mounting arms located on both sides of the frame-shaped deformation body are arranged in the same plane.

3. The micro-speaker according to claim 1, characterized in that: The sound absorbing material is sound absorbing particles or sound absorbing cotton.

4. The micro-speaker according to claim 1, characterized in that: The frame-shaped deformation body includes an upper plate, a lower plate, a left deformation arm and a right deformation arm, the upper plate and the lower plate are arranged opposite to each other, the upper plate is connected to the first diaphragm assembly located at the top of the box body, and the lower plate is connected to the first diaphragm assembly located at the bottom of the box body, the left deformation arm and the right deformation arm are symmetrically arranged, the opposite sides of the upper plate portion are respectively connected to the top end of the left deformation arm and the top end of the right deformation arm, the opposite sides of the lower plate portion are respectively connected to the bottom end of the left deformation arm and the bottom end of the right deformation arm, and the middle part of the left deformation arm and the middle part of the right deformation arm are respectively connected to the mounting arms.

5. The micro-speaker according to claim 4, characterized in that: The frame-shaped deformation body is a hexagonal deformation frame, and each corner of the hexagonal deformation frame is a thinned arc segment; the left deformable arm includes a left upper oblique arm and a left lower oblique arm, and the left upper oblique arm is connected to the left lower oblique arm through one of the thinned arc segments; the right deformable arm includes a right upper oblique arm and a right lower oblique arm, and the right upper oblique arm is connected to the right lower oblique arm through another thinned arc segment.

6. The micro-speaker according to claim 4, characterized in that: The left deformation arm and the right deformation arm are both arc-shaped.

7. The micro-speaker according to claim 1, characterized in that: The elastic frame is an integral structure formed by integral processing.

8. The micro-speaker according to claim 7, characterized in that: The elastic frame is made of metal or plastic.

9. The micro-speaker according to claim 1, characterized in that: The elastic support component is a centering support plate, each of the mounting arms is respectively connected to two of the elastic support components, the two centering support plates connected to the same mounting arm are symmetrically arranged, and the mounting arm is located between the two centering support plates connected thereto.

10. The micro-speaker according to claim 9, characterized in that: The centering support plate includes an inner fixing portion, a cantilever portion and an outer fixing portion which are connected in sequence, the inner fixing portion is connected to the mounting arm, the top and bottom ends of the outer fixing portion are both connected to the box body, and the cantilever portion is located in the gap between the magnetic steel assembly and the box body.

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