CN116887144A

CN116887144A - Micro-speaker

Info

Publication number: CN116887144A
Application number: CN202311003276.0A
Authority: CN
Inventors: 徐豪键
Original assignee: Foshan Veco Electronics Co ltd
Current assignee: Foshan Veco Electronics Co ltd
Priority date: 2023-08-09
Filing date: 2023-08-09
Publication date: 2023-10-13

Abstract

The invention discloses a micro loudspeaker, comprising a frame body; the paper drum comprises a vibrating diaphragm and a suspension edge, wherein the vibrating diaphragm is flexibly connected to one end of the frame body through the suspension edge, so that a first suspension system is formed; a magnetic circuit structure including a main magnetic portion and a yoke that covers and surrounds the main magnetic portion, a magnetic gap being provided between the main magnetic portion and a concave portion of the yoke; the voice coil is sleeved on the periphery of the main magnetic part and penetrates into the magnetic gap, and one end of the voice coil is fixedly connected with the vibrating diaphragm; a spring wave flexibly connecting the bottom of the voice coil and the bottom surface of the frame body; and a single-piece elastic member flexibly connecting the first surface of the bottom of the yoke and the bottom surface of the frame, thereby constituting a second suspension system.

Description

Micro-speaker

Technical Field

The invention relates to the technical field of acoustic elements, in particular to a miniature loudspeaker with a double suspension system.

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, a magnetic circuit system disposed in the frame, and a vibration system including a diaphragm and a voice coil disposed under the diaphragm. The voice coil drives the vibrating diaphragm to sound under the action of the magnetic circuit system.

However, the vibration of the speaker diaphragm may be transmitted to the electronic product along with the sound box, and generate noise. Since the internal space of electronic products is very limited, how to design an effective damping structure on a speaker unit has become a challenge in the art.

Disclosure of Invention

The present invention is directed to an improved micro-speaker with a dual suspension system to solve the above-mentioned problems.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the invention provides a micro-speaker, comprising: a frame; the paper drum comprises a vibrating diaphragm and a suspension edge, wherein the vibrating diaphragm is flexibly connected to one end of the frame body through the suspension edge, so that a first suspension system is formed; a magnetic circuit structure including a main magnetic portion and a yoke that covers and surrounds the main magnetic portion, a magnetic gap being provided between the main magnetic portion and a concave portion of the yoke; the voice coil is sleeved on the periphery of the main magnetic part and penetrates into the magnetic gap, and one end of the voice coil is fixedly connected with the vibrating diaphragm; a spring wave flexibly connecting the bottom of the voice coil and the bottom surface of the frame body; and a single-piece elastic member flexibly connecting the first surface of the bottom of the yoke and the bottom surface of the frame, thereby constituting a second suspension system.

According to an embodiment of the present invention, the elastic wave includes a first end portion, a second end portion, and a cantilever connecting the first end portion and the second end portion

According to an embodiment of the invention, the ratio (L/D) of the length L of the cantilever to the cantilever distribution distance D is between 2 and 15.

According to the embodiment of the invention, the voice coil lead is fixedly connected to the welding part of the first end part of the elastic wave through electronic spot welding and is electrically connected to a circuit on the elastic wave and a connecting terminal of the second end part.

According to an embodiment of the invention, the yoke has a central opening.

According to an embodiment of the present invention, the central opening is an elongated through-hole extending in a long axis direction of the yoke, and the central opening penetrates through the entire thickness of the yoke.

According to an embodiment of the invention, an elastic material is arranged in the central opening.

According to an embodiment of the invention, the elastic material comprises foam or rubber.

According to an embodiment of the present invention, one end of the center opening is covered by the main magnet portion fixed to the yoke.

According to an embodiment of the invention, no openings are provided in the bottom of the yoke.

According to an embodiment of the present invention, the first surface is coplanar with the bottom surface of the frame.

According to an embodiment of the present invention, the width of the one-piece elastic member is greater than the width of the hanging edge.

According to an embodiment of the invention, the one-piece elastic member is an integrally formed structure.

According to an embodiment of the invention, the one-piece elastic member is of annular configuration.

According to an embodiment of the invention, the one-piece elastic member is a continuous annular structure.

According to an embodiment of the invention, the one-piece elastic member is a discontinuous annular structure.

According to an embodiment of the present invention, the single-piece elastic member is formed of a metal sheet, a plastic sheet, a rubber sheet, or a paper sheet.

According to an embodiment of the invention, the one-piece resilient member comprises an inner edge structure, an outer edge structure, and a cantilever connecting the inner edge structure and the outer edge structure.

According to an embodiment of the invention, the inner edge structure is directly connected and fixed to the periphery of the first surface.

According to an embodiment of the present invention, the main magnetic portion is fixed to a second surface of the bottom portion of the yoke opposite to the first surface.

According to an embodiment of the present invention, an annular recess structure is further provided at a periphery of the bottom portion of the yoke to form an annular third surface of the bottom portion lower than the first surface, thereby providing a retraction space between the annular recess structure and the one-piece elastic member.

According to the embodiment of the invention, the outer edge structure is provided with the positioning concave hole, and the frame body is additionally provided with the positioning column corresponding to the positioning concave hole, so that the positioning is convenient during assembly.

According to an embodiment of the invention, the straight line distance of the opposite joint of the cantilever between the inner edge structure and the outer edge structure is d, and the actual length of the opposite joint of the cantilever between the inner edge structure and the outer edge structure is l, wherein l/d is between 1 and 3.

Drawings

Fig. 1 is an elevation side view of a micro-speaker according to an embodiment of the present invention.

Fig. 2 is a rear side view of a micro-speaker according to an embodiment of the present invention.

Fig. 3 is an exploded view of the micro speaker of fig. 1.

Fig. 4 is a schematic I-I' cross-sectional view of the micro-speaker of fig. 2.

Fig. 5 is a schematic view of section II-II' of the micro-speaker of fig. 2.

Fig. 6 shows the length, width and distribution distance of the cantilever of the projectile.

Reference numerals illustrate: 1-a micro-speaker; 10-a frame; 10 e-a recess; 10 p-opening; 10 r-positioning columns; 20-drum paper; 201-a diaphragm; 202-hanging edges; 30-magnetic circuit structure; 301-a main magnetic part; 303-yoke; 303 a-concave folds; 303 b-bottom; 303 r-annular recess structure; 303 t-a central opening; 305-washer; 40-voice coil; 401a, 401 b-voice coil leads; 501-flicking wave; 501 a-a first end; 501 b-a second end; 501 c-cantilever; 60-elastic member; 601-inner edge structure; 602-an outer rim structure; 602 c-a connection; 602 r-positioning concave holes; 603-cantilever; d-cantilever distribution distance; l-cantilever length; d-linear distance; l-the actual length; g-magnetic gap; s0-bottom surface; s1-a first surface; s2-a second surface; s3-a third surface; w, W1, W2-width.

Detailed Description

For the purpose of making 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 clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

In the description of the present invention, it should 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Referring to fig. 1 to 5, fig. 1 is a front side view of a micro-speaker according to an embodiment of the present invention, fig. 2 is a back side view of the micro-speaker according to an embodiment of the present invention, fig. 3 is an exploded view of the micro-speaker of fig. 1, fig. 4 is a schematic I-I 'section view of the micro-speaker of fig. 2, and fig. 5 is a schematic II-II' section view of the micro-speaker of fig. 2. .

As shown in fig. 1 to 5, the micro speaker 1 includes a housing 10 and a paper drum (drum paper) 20 provided on the housing 10. According to an embodiment of the present invention, the drum paper 20 may include a diaphragm (diahragm) 201 and a hanging edge (peripheral) 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 hanging edge 202 may be made of different materials, but are not limited thereto.

According to the embodiment of the present invention, preferably, the diaphragm 201 of the drum paper 20 is flexibly connected to one end of the frame 10 via the hanging edge 202. According to an embodiment of the present invention, the diaphragm 201 is provided in a long and narrow shape, that is, 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 10p adapted to the shape of the paper drum 20 and the diaphragm 201, and the diaphragm 201 is connected to the frame 10 by an annular hanging edge 202 to seal the opening 10p, and a first hanging system is formed at one end of the frame 10. The frame 10 has concave portions 10e at opposite ends in the longitudinal direction.

According to an embodiment of the present invention, a magnetic circuit structure 30 is provided in the housing 10, and includes a main magnetic portion 301, a yoke 303 covering and surrounding the main magnetic portion 301, and a washer (washer) 305 provided on the main magnetic portion 301 for magnetic conduction. According to an embodiment of the present invention, the main magnetic part 301 is fixed to the yoke 303. According to the embodiment of the present invention, as shown in fig. 4, a magnetic gap G is provided between the main magnetic portion 301 and the concave portion 303a of the yoke 303.

According to the embodiment of the present invention, a voice coil (voice coil) 40 is further disposed in the housing 10. According to an embodiment of the present invention, the voice coil 40 is formed by winding a wire alone, and a voice coil sleeve (bobbin) is not required. The voice coil 40 is fitted around the outer periphery of the main magnetic portion 301 and penetrates into the magnetic gap G in the up-down direction. According to the embodiment of the present invention, the voice coil 40 is provided in a long and narrow shape, that is, the size in the length direction thereof is larger than the size in the width direction, and one 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 center axis in the length direction of the diaphragm 201. According to the embodiment of the invention, the voice coil 40 can be connected to an external signal via a voice coil lead wire, and then the voice coil 40 vibrates and drives the diaphragm 201 to vibrate and sound in cooperation with the magnetic field provided by the magnetic circuit structure 30.

According to an embodiment of the present invention, as shown in fig. 2, 3 and 5, two other symmetrically arranged elastic waves (damper) 501 are provided in the frame 10. According to the embodiment of the present invention, the two elastic waves 501 are provided in the concave portions 10e of the two ends of the long axis of the voice coil 40, for example, fixed with an adhesive. According to an embodiment of the present invention, the elastic wave 501 is formed by a flexible circuit board (flexible printed circuit, FPC).

According to an embodiment of the present invention, as shown in fig. 2, the elastic wave 501 mainly includes a first end portion 501a, a second end portion 501b, and a cantilever 501c connecting the first end portion 501a and the second end portion 501 b. The hollow part is arranged among the first end part 501a, the second end part 501b and the cantilever 501c. The elastic wave 501 is fixed to the lower portions of both ends of the long axis of the voice coil 40 with an adhesive by the first end 501a, and fixed to the concave portions 10e of both ends of the long axis of the housing 10 with an adhesive by the second end 501 b. Voice coil leads 401a and 401b are fixedly connected to solder portions 511a and 511b, respectively, of a first end portion 501a of the front face of the damper 501 by electronic spot welding, are electrically connected to a circuit on the bottom face of the damper 501, and are further electrically connected to a connection terminal on the bottom face of a second end portion 501b by the circuit on the damper 501.

Referring to fig. 6, the length L, width W and distribution distance D of the cantilever of the elastic wave are shown. As shown in fig. 6, the length L of the cantilever 501c refers to the length of the cantilever 501c from the second end 501b to the first end 501a, and the cantilever distribution distance D refers to the width of the serpentine or curved cantilever 501c between the first end 501a and the second end 501 b. According to the embodiment of the invention, taking the cantilever width of 0.45mm as an example, the ratio (L/D) of the cantilever length L to the cantilever distribution distance D is required to be between 2 and 15.

According to an embodiment of the present invention, the yoke 303 has a central opening 303t, for example, the central opening 303t may be an elongated perforation extending along the long axis direction of the yoke 303, which penetrates the entire thickness of the yoke 303, but is not limited thereto. By providing the central opening 303t in the yoke 303, an effect of adjusting vibration characteristics can be achieved, for example, a large central opening 303t can be formed, the overall weight of the yoke 303 can be reduced, or different materials can be optionally filled in the central opening 303t to achieve different vibration effects, or an elastic material, such as foam or rubber, can be optionally provided in the central opening 303t to avoid collision with other components or housings during operation. According to an embodiment of the present invention, one end of the central opening 303t may be covered by the main magnet 301 fixed to the yoke 303. According to other embodiments of the present invention, the bottom 303b of the yoke 303 may not be provided with any opening.

According to the embodiment of the present invention, the yoke 303 is connected to the frame 10 only through the one-piece and integrally formed elastic member 60, and thus the yoke 303 itself is not in direct contact with the frame 10, thereby constituting the second suspension system at the other end of the frame 10.

According to an embodiment of the present invention, the elastic member 60 may be a ring-shaped structure disposed around the yoke 303. According to embodiments of the present invention, the elastic member 60 may be a continuous loop structure or a discontinuous loop structure. According to an embodiment of the present invention, the elastic member 60 may be made of an elastic material such as a metal sheet, a plastic sheet, a rubber sheet, or a paper sheet. According to an embodiment of the present invention, for example, the elastic member 60 may include metal such as iron, stainless steel, aluminum, etc., but is not limited thereto. According to an embodiment of the present invention, for example, the elastic member 60 may include a polymer material such as polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyimide (PI), etc., but is not limited thereto.

According to an embodiment of the present invention, as shown in fig. 2 to 4, the elastic member 60 may include an inner edge structure 601, which may be directly attached and fixed to the periphery of the first surface S1 of the bottom 303b of the yoke 303 by, for example, adhesion. The main magnetic portion 301 is adhered and fixed to a second surface S2 of the bottom 303b of the yoke 303 opposite to the first surface S1. According to embodiments of the present invention, the inner edge structure 601 may be a continuous annular structure or a discontinuous annular structure. According to the embodiment of the invention, the elastic member 60 may include an outer edge structure 602, which may be directly connected to the bottom surface S0 of the frame 10 by an adhesive manner. According to embodiments of the present invention, the peripheral edge structure 602 may be a continuous annular structure or a discontinuous annular structure. According to an embodiment of the present invention, the first surface S1 of the bottom 303b of the yoke 303 may be approximately coplanar with the bottom surface S0 of the frame 10.

According to an embodiment of the present invention, the elastic member 60 may include cantilever arms 603 distributed between the inner edge structure 601 and the outer edge structure 602, wherein the inner edge structure 601 and the outer edge structure 602 are connected only by the cantilever arms 603. In other words, the hollow portion is formed between the inner edge structure 601 and the outer edge structure 602 except for the cantilever 603. According to the embodiment of the present invention, as shown in fig. 4, the width W1 of the elastic member 60 across the yoke 303 and the frame 10 is larger than the width W2 of the hanging edge 202 of the drum paper 20 to provide a more stable hanging function.

As shown in FIG. 2, the cantilever 603 of the elastic member 60 has a linear distance d between the opposite points of the inner edge structure 601 and the outer edge structure 602, and the actual length l of the opposite points of the cantilever 603 between the inner edge structure 601 and the outer edge structure 602 is 1 to 3. By adjusting the ratio of l/d, the strength of the elastic member 60 and the stability at vibration can be adjusted.

As shown in fig. 3, for example, the inner edge structure 601 of the elastic member 60 is a continuous annular structure, while the outer edge structure 602 is discontinuous. The outer rim structure 602 comprises two connecting portions 602c parallel to the long sides of the inner rim structure 601. The two ends of the inner edge structure 601 are not surrounded by the outer edge structure 602, and are open. The elastic member 60 has 4 cantilever arms 603, and each cantilever arm 603 may be bent from a long side 601b of the inner rim structure 601 to a connection portion 602c of the outer rim structure 602. Although the spring 60 of fig. 3 has 4 cantilevers 603, it will be understood by those skilled in the art that the spring of fig. 3 is only illustrative, and the shape and number of cantilevers of the spring 60 may be appropriately adjusted as appropriate.

According to the embodiment of the present invention, the elastic member 60 is an integrally formed structure, for example, may be stamped from a single metal sheet or plastic sheet, but is not limited thereto. According to the embodiment of the present invention, as shown in fig. 4, the periphery of the bottom 303b of the yoke 303 is further provided with an annular recess structure 303r, forming an annular third surface S3 of the bottom 303b, which is lower than the first surface S1 of the bottom 303b of the yoke 303, thereby providing a retraction space between the annular recess structure 303r and the elastic member 60, so that the elastic member 60 can be prevented from colliding with the bottom 303b of the yoke 303 during vibration.

According to the embodiment of the invention, as shown in fig. 2 and 3, the outer edge structure 602 of the elastic member 60 may be provided with a positioning concave hole 602r, and the frame 10 may be provided with a positioning post 10r corresponding to the positioning concave hole 602r, so as to facilitate positioning during assembly, increase assembly efficiency, and enable the elastic member 60 to be more stable. According to an embodiment of the present invention, the cantilever length of the elastic member 60 may be adjusted to achieve a desired vibration effect.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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:

a frame;

the paper drum comprises a vibrating diaphragm and a suspension edge, wherein the vibrating diaphragm is flexibly connected to one end of the frame body through the suspension edge, so that a first suspension system is formed;

a magnetic circuit structure including a main magnetic portion and a yoke that covers and surrounds the main magnetic portion, a magnetic gap being provided between the main magnetic portion and a concave portion of the yoke;

the voice coil is sleeved on the periphery of the main magnetic part and penetrates into the magnetic gap, and one end of the voice coil is fixedly connected with the vibrating diaphragm;

a spring wave flexibly connecting the bottom of the voice coil and the bottom surface of the frame body; and

and a single-piece elastic member flexibly connecting the first surface of the bottom of the yoke and the bottom surface of the frame body, thereby forming a second suspension system.

2. The micro-speaker of claim 1, wherein the bounce wave comprises a first end, a second end, and a cantilever connecting the first end and the second end.

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

4. The micro-speaker of claim 1, wherein a voice coil lead is fixedly connected to a soldered portion of the first end portion of the damper by electronic spot welding, and is electrically connected to a circuit on the damper and a connection terminal of the second end portion.

5. The micro-speaker of claim 1, wherein the yoke has a central opening.

6. The micro-speaker of claim 5, wherein the central opening is an elongated through hole extending in a long axis direction of the yoke, and the central opening penetrates through an entire thickness of the yoke.

7. A micro-speaker as claimed in claim 5, wherein an elastic material is provided in the central aperture.

8. The micro-speaker of claim 7, wherein the elastic material comprises foam or rubber.

9. The micro-speaker of claim 5, wherein one end of the central opening is covered by the main magnet portion fixed to the yoke.

10. The micro-speaker of claim 1, wherein no opening is provided in the bottom of the yoke.

11. The micro-speaker of claim 1, wherein the first surface is coplanar with a bottom surface of the housing.

12. The micro-speaker of claim 1, wherein the width of the one-piece resilient member is greater than the width of the overhanging edge.

13. The micro-speaker of claim 1, wherein the single piece resilient member is an integrally formed structure.

14. The micro-speaker of claim 13, wherein the one-piece resilient member is a ring-like structure.

15. The micro-speaker of claim 14, wherein the single piece resilient member is a continuous loop structure.

16. The micro-speaker of claim 14, wherein the single piece resilient member is a discontinuous annular structure.

17. The micro-speaker of claim 13, wherein the single piece elastic member is formed of a metal sheet, a plastic sheet, a rubber sheet, or a paper sheet.

18. The micro-speaker of claim 13, wherein the single piece resilient member comprises an inner edge structure, an outer edge structure, and a cantilever connecting the inner edge structure and the outer edge structure.

19. The micro-speaker of claim 18, wherein the inner edge structure is directly attached to the perimeter of the first surface.

20. The micro-speaker of claim 19, wherein the main magnetic portion is fixed to a second surface of the bottom portion of the yoke opposite to the first surface.

21. The micro-speaker as set forth in claim 20, wherein the periphery of the bottom portion of the yoke is further provided with an annular recess structure forming an annular third surface of the bottom portion lower than the first surface, thereby providing a recession space between the annular recess structure and the one-piece elastic member.

22. The micro-speaker of claim 18, wherein the outer edge structure is provided with a positioning recess, and the frame is further provided with a positioning post corresponding to the positioning recess, so as to facilitate positioning during assembly.

23. The micro-speaker of claim 18, wherein the cantilever has a linear distance d of the opposing junction between the inner and outer edge structures, and the cantilever has an actual length l of the opposing junction between the inner and outer edge structures, wherein l/d is between 1 and 3.