CN217037460U

CN217037460U - Micro speaker and damper for micro speaker

Info

Publication number: CN217037460U
Application number: CN202220644947.6U
Authority: CN
Inventors: 徐庆山; 徐豪键
Original assignee: Foshan Veco Electronics Co ltd
Current assignee: Foshan Veco Electronics Co ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-07-22
Anticipated expiration: 2032-03-22

Abstract

The utility model discloses a micro-speaker and an elastic wave used for the micro-speaker, the micro-speaker comprises: the voice coil structure comprises a frame body, a vibrating diaphragm arranged on the frame body, and a magnetic circuit structure and a voice coil arranged in the frame body, wherein the upper side of the voice coil is fixedly connected to the vibrating diaphragm, the magnetic circuit structure is arranged below the voice coil, a voice coil balance system is arranged in the frame body and consists of two symmetrically arranged elastic waves which are respectively arranged below two ends of a long shaft of the voice coil and fixed by viscose, the elastic waves comprise a first end part, a second end part and a cantilever connected with the first end part and the second end part, the cantilever extends out from the first end part, the shape of the cantilever is a curved curve, at least one circular arc larger than or equal to 180 degrees is provided, and at least one reverse curve point is provided, so that the curve is concave from convex to concave or convex from concave to concave.

Description

Micro speaker and damper for micro speaker

Technical Field

The utility model relates to the technical field of loudspeaker equipment, in particular to a micro loudspeaker and an elastic wave for the same.

Background

A speaker is a transducer element that converts an electrical signal into an acoustic signal, and is an important acoustic component in electronic products. The speaker module generally includes a frame, and a magnetic circuit system and a vibration system disposed in the frame, wherein the vibration system includes a diaphragm and a voice coil disposed below the diaphragm. The voice coil drives the diaphragm to sound under the vibration effect of the magnetic circuit system.

With the high portability pursuit of electronic products, volume reduction is a necessary goal when various micro-speaker products are updated, but the volume reduction means that the volume of the magnet of the micro-speaker must be reduced at the same time, resulting in volume reduction. If the volume reduction caused by the magnet becoming smaller is compensated by increasing the power, the micro-speaker is exposed to the risk of tearing the voice coil lead wire due to the too large amplitude.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in an effort to solve the above-mentioned problems occurring in the prior art, and a primary object of the present invention is to provide a micro-speaker and a damper for the micro-speaker.

In order to achieve the purpose, the utility model provides the following technical scheme:

a micro-speaker, comprising: the voice coil balance structure comprises a frame body, a vibrating diaphragm arranged on the frame body, and a magnetic structure and a voice coil arranged in the frame body, wherein the upper side of the voice coil is fixedly connected to the vibrating diaphragm, the magnetic structure is arranged below the voice coil, a voice coil balance system is arranged in the frame body and comprises two symmetrically arranged elastic waves which are respectively arranged below two ends of a long shaft of the voice coil and fixed by viscose, the elastic waves comprise a first end part, a second end part and a cantilever connected with the first end part and the second end part, the shape of the cantilever extending out from the first end part is a curved curve, at least one circular arc greater than or equal to 180 degrees is provided, and at least one reverse curve point is provided for enabling the curve to be concave through convex-concave or convex through concave-convex.

According to the embodiment of the utility model, the elastic wave is of a bilaterally symmetrical structure.

According to the embodiment of the utility model, the ratio L/D of the length L of the cantilever and the distribution distance D of the cantilever is between 2 and 15.

According to the embodiment of the utility model, the included angle between the cantilever extending from the first end and the first end is between 30 and 150 degrees.

According to the embodiment of the utility model, the frame body is provided with the positioning column, and the elastic wave is provided with the corresponding positioning hole.

According to the embodiment of the utility model, when the elastic wave is installed, the positioning columns on the frame body penetrate through the corresponding positioning holes on the elastic wave to achieve accurate positioning.

According to an embodiment of the utility model, the cantilever has a width of 0.45 mm.

According to the embodiment of the present invention, the diaphragm is provided in a long and narrow shape, and the dimension in the length direction is larger than the dimension in the width direction.

According to the embodiment of the utility model, the frame body is provided with an opening matched with the shape of the diaphragm, and the diaphragm is connected to the frame body through the annular suspension edge so as to seal the opening.

According to an embodiment of the present invention, the magnetic circuit structure includes a main magnetic portion, a yoke located below the main magnetic portion, and a washer on the main magnetic portion for conducting magnetism, and the voice coil is sleeved on the outer periphery of the main magnetic portion.

According to an embodiment of the present invention, the yoke includes a foot portion contacting the second end portion of the damper.

According to an embodiment of the present invention, the damper is fixed below two ends of the long axis of the voice coil by the first end portion and fixed below two ends of the long axis of the frame by the second end portion, and a width of the second end portion adhered below two ends of the long axis of the frame is greater than a width of the first end portion adhered below two ends of the long axis of the voice coil.

In another aspect, the present invention provides an elastic wave for a micro speaker, including: the cantilever comprises a first end part, a second end part and a cantilever connecting the first end part and the second end part, wherein the shape of the cantilever extending out from the first end part is a curved curve, has at least one circular arc which is greater than or equal to 180 degrees, and has at least one reverse curve point which enables the curve to be changed from convex to concave or from concave to convex.

According to the embodiment of the utility model, the elastic wave is formed by the flexible circuit board.

According to an embodiment of the present invention, an angle between the cantilever extending from the first end and the first end is between 30 and 150 degrees.

According to an embodiment of the utility model, the width of the second end portion is larger than the width of the first end portion.

Compared with the prior art, the utility model has the beneficial effects that: through set up the bullet ripples that constitutes by the flexible circuit board on the voice coil loudspeaker voice coil, can provide sufficient elasticity and damping to reduce the vibration of voice coil loudspeaker voice coil lead wire, and then improve rated power, and life-span test under the high power operation.

Drawings

Fig. 1 is a schematic bottom view of a micro-speaker according to an embodiment of the utility model.

Fig. 2 is an exploded view of the micro-speaker of fig. 1.

Fig. 3 illustrates a layout of the damper.

Fig. 4 is a side view of the bow of the bullet seen after the yoke has been partially removed.

Description of reference numerals: 1-a micro-speaker; 10-a frame body; 10 a-an opening; 120-a locating post; 20-drum paper; 201-a diaphragm; 202-overhanging fringe; 30-magnetic circuit structure; 301-a main magnetic portion; 302-washer; 303-yoke iron; 303 f-foot; 40-a voice coil; 401a, 401 b-voice coil leads; 50-a voice coil balance system; 501-elastic wave; 501 a-a first end; 501 b-second end; 501 c-cantilever; 511a, 511 b-welds; 520-positioning holes; 701. 702 — an external signal conductor; AR-circular arc; IP-inflection point; an L-extension length; d-distribution distance; w1, W2-Width; d-cantilever width; theta-angle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and 2, fig. 1 is a schematic bottom view of a micro-speaker according to an embodiment of the utility model. Fig. 2 is an exploded view of the micro-speaker of fig. 1. As shown in fig. 1 and 2, according to an embodiment of the present invention, the micro-speaker 1 includes a frame 10 and drum paper (drum paper)20 disposed on the frame 10. According to the embodiment of the present invention, the drum paper 20 may include a diaphragm (diaphragm)201 and a suspension edge (surround)202 surrounding the diaphragm 201 and having an arc-shaped or wave-shaped cross section. According to the embodiment of the present invention, the diaphragm 201 and the suspension edge 202 may be made of different materials, but are not limited thereto.

According to the embodiment of the present invention, it is preferable that the drum paper 20 is flexibly connected to one end of the frame body 10. According to an embodiment of the present invention, the diaphragm 201 is provided in a long and narrow shape, i.e., a dimension in a length direction thereof is larger than a dimension in a width direction thereof. According to the embodiment of the present invention, the frame 10 has an opening 10a adapted to the shape of the tympanum 20 and the diaphragm 201, and the diaphragm 201 is connected to the frame 10 through the annular suspension edge 202 to seal the opening 10 a. According to the embodiment of the present invention, a magnetic structure 30 including a main magnetic portion 301, a washer 302 annularly provided on one side of the main magnetic portion 301, and a yoke 303 positioned on the other side of the main magnetic portion 301 is provided in the frame 10.

According to the embodiment of the present invention, a voice coil (voice coil)40 is further disposed in the housing 10. According to the embodiment of the present invention, the voice coil 40 is formed by separately winding an enameled wire, and a voice coil sleeve (bobbin) is not required. The voice coil 40 is sleeved on the outer periphery of the main magnetic part 301. According to the embodiment of the present invention, the voice coil 40 is formed in a long and narrow shape, that is, the dimension in the length direction is larger than the dimension in the width direction, and the upper end of the voice coil 40 is fixedly connected to the diaphragm 201. Preferably, in the embodiment of the present invention, the center of the voice coil 40 is located on the central axis in the length direction of the diaphragm 201. The magnetic field provided by the magnetic circuit structure makes the voice coil 40 vibrate, driving the diaphragm 201 to vibrate and sound.

According to the embodiment of the present invention, a voice coil balance system 50 is further disposed in the frame 10, and is mainly composed of two symmetrically disposed damper (damper) 501. According to the embodiment of the present invention, one end of each damper 501 is disposed below both ends of the long axis of the voice coil 40 and fixed by adhesive. According to the embodiment of the present invention, the elastic wave 501 may be formed by a Flexible Printed Circuit (FPC), but is not limited thereto.

According to the embodiment of the present invention, the damper 501 mainly includes a first end 501a, a second end 501b, and a cantilever 501c connecting the first end 501a and the second end 501 b. A hollow part is arranged between the first end 501a, the second end 501b and the cantilever 501 c. The damper 501 is fixed by adhesive to the lower portions of both ends of the long axis of the voice coil 401 at the first end 501a and fixed by adhesive to the lower portions of both ends of the long axis of the housing 10 at the second end 501 b. The voice coil leads 401a and 401b are fixedly attached to the

soldering portions

511a and 511b of the first end portion 501a of the front surface of the damper 501 by electronic spot welding, respectively, are electrically connected to the circuit on the bottom surface of the damper 501, and are further electrically connected to the connection terminals on the bottom surface of the second end portion 501b through the circuit on the damper 501.

According to the embodiment of the present invention, the connection terminals on the bottom surface of the second end 501b are respectively soldered with

external signal wires

701 and 702, and are connected to the outside to input an external sound source signal through the elastic wave 501, so that the diaphragm 201 vibrates and generates sound. According to the embodiment of the utility model, when the damper 501 is installed, accurate positioning can be achieved through the positioning posts 120 on the frame 10 and the corresponding positioning holes 520 on the damper 501.

According to the embodiment of the present invention, the length of the yoke 303 is approximately equal to the length of the frame 10. According to the embodiment of the present invention, the yoke 303 includes two end legs 303f, for example, fixed to the second end 501b of the damper 501 by adhesive. The leg portions 303f at the two ends of the yoke 303 press the second end portion 501b of the damper 501, so that the stability of the damper 501 during operation can be improved.

Please refer to fig. 3 and 4. Fig. 3 illustrates a layout of the damper 501, and fig. 4 is a side perspective view of the damper 501 with a portion of the yoke 303 removed. As shown in fig. 3 and 4, the damper 501 has two cantilevers 501c and is a bilaterally symmetric structure. The first end 501a and the second end 501b of the elastic wave 501 are parallel to the reference x-axis direction, and the two cantilevers 501c are interposed between the first end 501a and the second end 501b and extend in a meandering manner toward the reference x-axis direction or the reference y-axis direction. According to the embodiment of the present invention, in order to enable the elastic wave 501 to provide sufficient elasticity and damping, the cantilever 501c is shaped as a curved curve having at least one arc AR greater than or equal to 180 degrees and at least one inflection point IP where the curve is turned from convex to concave (or from concave to convex). In addition, an angle θ between the cantilever 501c extending from the first end 501a and the first end 501a adhered to the lower portion of the voice coil 40 may be between 30 and 150 degrees, so as to reduce a torque (torque) acting on the cantilever 501c and improve stability of the cantilever 501 c. From the first end 501a, a part of the cantilever 501c will advance toward the reference y-axis with respect to the cantilever centerline. According to the embodiment of the present invention, in order to increase the stability and balance of the damper 501 during operation, the width W2 of the second end 501b adhered to the lower portion of the frame 10 is greater than the width W1 of the first end 501a adhered to the lower portion of the voice coil 40.

According to the embodiment of the present invention, the cantilever distribution distance D refers to the width of the serpentine or bent cantilever 501c distributed between the first end 501a and the second end 501 b. According to the embodiment of the present invention, taking the cantilever width D as 0.45mm as an example, the ratio L/D of the extension length L of the cantilever 501c between the first end 501a and the second end 501b to the cantilever distribution distance D is between 2 and 15.

The utility model sets two independent elastic waves 501 as media, and changes the voice coil amplitude originally born by the lead of the voice coil into the amplitude born by the elastic waves 501. The damper 501 provides sufficient elasticity and damping so that the micro-speaker can also absorb the amplitude of high power, thereby increasing the rated power (providing high volume even when the volume is reduced), and performing a life test under high power operation. In addition, the shape, the style and the thickness of the two independent elastic waves 501 can be adjusted according to the vibration mode of the diaphragm 201, so that the vibration behavior of the micro-speaker is more optimized to provide better sound quality. The two independent elastic waves 501 can be connected to the frame 10 in advance during the manufacturing process to form a semi-finished product, which simplifies the complexity of the assembly and manufacturing process of the micro-speaker.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-speaker, comprising: the voice coil balance structure comprises a frame body, a vibrating diaphragm arranged on the frame body, and a magnetic structure and a voice coil arranged in the frame body, wherein the upper side of the voice coil is fixedly connected to the vibrating diaphragm, and the magnetic structure is arranged below the voice coil.

2. The microspeaker of claim 1 wherein the damper is a bilaterally symmetric structure.

3. The micro-speaker of claim 1, wherein the ratio L/D of the length L of the cantilever to the cantilever distribution distance D is between 2 and 15.

4. The microspeaker of claim 1 wherein the angle between the cantilever extending away from the first end and the first end is between 30 and 150 degrees.

5. The micro-speaker as claimed in claim 1, wherein the frame has a positioning post, and the elastic wave has a corresponding positioning hole.

6. The micro-speaker of claim 5, wherein when the damper is installed, the positioning posts on the frame body pass through the corresponding positioning holes on the damper to achieve accurate positioning.

7. The micro-speaker of claim 1, wherein the cantilever arm has a width of 0.45 mm.

8. The microspeaker of claim 1 wherein the diaphragm is provided in an elongated shape having a dimension in a length direction greater than a dimension in a width direction.

9. The micro-speaker of claim 8, wherein the frame has an opening adapted to the shape of the diaphragm, and the diaphragm is connected to the frame by an annular suspension to seal the opening.

10. The micro-speaker as claimed in claim 1, wherein the magnetic structure comprises a main magnetic portion, a yoke located below the main magnetic portion, and a coil located on the main magnetic portion for conducting magnetic current, the voice coil being disposed around the main magnetic portion.

11. The microspeaker of claim 10 wherein the yoke includes a foot in contact with the second end of the damper.

12. The micro-speaker of claim 1, wherein the damper is fixed to the lower portions of the two ends of the long axis of the voice coil by the adhesive through the first end portion, and is fixed to the lower portions of the two ends of the long axis of the frame by the adhesive through the second end portion, and a width of the second end portion adhered to the lower portions of the two ends of the long axis of the frame is larger than a width of the first end portion adhered to the lower portions of the two ends of the long axis of the voice coil.

13. An acoustic wave for a micro-speaker, comprising: the cantilever comprises a first end part, a second end part and a cantilever connecting the first end part and the second end part, wherein the shape of the cantilever extending out from the first end part is a curved curve, has at least one circular arc which is greater than or equal to 180 degrees, and has at least one reverse curve point which enables the curve to be changed from convex to concave or from concave to convex.

14. The damper for a microspeaker of claim 13 wherein the damper is a bilaterally symmetric structure.

15. The damper for a microspeaker as claimed in claim 13 wherein the ratio L/D of the length L of the cantilever to the distribution distance D of the cantilever is between 2 and 15.

16. The damper for a microspeaker of claim 13 wherein the damper is formed of a flexible circuit board.

17. The damper for a microspeaker as defined in claim 13 wherein the angle between the cantilever extending from the first end and the first end is between 30-150 degrees.

18. The damper for a microspeaker as defined in claim 13 wherein the width of the second end portion is greater than the width of the first end portion.

19. The damper for a microspeaker of claim 13 wherein the width of the cantilever is 0.45 mm.