CN112689226B

CN112689226B - Micro loudspeaker

Info

Publication number: CN112689226B
Application number: CN201910990116.7A
Authority: CN
Inventors: 黄锦堂
Original assignee: Taiwan Luxshare Precision Ltd
Current assignee: Taiwan Luxshare Precision Ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2022-06-21
Anticipated expiration: 2039-10-17
Also published as: CN112689226A

Abstract

The invention relates to a micro loudspeaker which comprises a hollow frame, a vibrating diaphragm, a voice coil, an elastic damping sheet and a magnetic return component. The hollow frame comprises a hollow part, a top surface and a bottom surface which are opposite to each other, and the hollow part is communicated between the top surface and the bottom surface. The diaphragm includes a peripheral portion and a central portion, the peripheral portion surrounds the periphery of the central portion, and the peripheral portion covers the top surface of the hollow frame. The voice coil is coaxially arranged in the hollow part of the hollow frame and comprises a top edge and a bottom edge which are opposite, and the top edge is fixedly connected with the central part of the vibrating diaphragm. The elastic damping sheet comprises an elastic sheet body, an outer fixing piece and an inner fixing piece, wherein the elastic sheet body is connected between the outer fixing piece and the inner fixing piece. The outer fixing piece is fixedly connected to the bottom surface of the hollow frame, and the inner fixing piece is fixedly connected to the bottom edge of the voice coil. The magnetic return component is accommodated in the hollow part of the hollow frame, is positioned in the voice coil and does not contact the voice coil.

Description

Micro loudspeaker

Technical Field

The present disclosure relates to loudspeakers, and particularly to a micro-speaker.

Background

Because the whole size of traditional speaker is great has longer voice coil loudspeaker voice coil, so need have the middle supplementary voice coil loudspeaker voice coil mechanism of fixing, let the vibration more stable and listen better when music. This additional holding of the voice coil mechanism is commonly referred to as a damper. The existing micro-speaker generally has only a diaphragm without an elastic damping plate (damper) under consideration of the overall size and structure, and can stably operate under the conditions of basically weak bass and weak power. However, when the existing system uses a large amount of DSP algorithms and an intelligent amplifier (intellignecepmplifier), it is obviously impossible to operate stably, resulting in the micro-speaker being nonlinear and easily generating noise.

Disclosure of Invention

In view of the foregoing problems, an embodiment of the present invention provides a micro-speaker, which includes a hollow frame, a diaphragm, a voice coil, an elastic damping plate, and a magnetic return element. The hollow frame comprises a hollow part and a top surface and a bottom surface which are opposite to each other, and the hollow part is communicated between the top surface and the bottom surface. The diaphragm comprises an outer peripheral part and a central part, wherein the outer peripheral part surrounds the periphery of the central part, and the outer peripheral part is covered on the top surface of the hollow frame. The voice coil is coaxially arranged in the hollow part of the hollow frame. The voice coil comprises a top edge and a bottom edge which are opposite, and the top edge is fixedly connected with the central part of the vibrating diaphragm. The elastic damping sheet comprises an elastic sheet body, an outer fixing piece and an inner fixing piece. The elastic sheet body is connected between the outer fixing piece and the inner fixing piece, the outer fixing piece is fixedly connected to the bottom surface of the hollow frame, and the inner fixing piece is fixedly connected to the bottom edge of the voice coil. The magnetic return component is accommodated in the hollow part of the hollow frame, is positioned in the voice coil and does not contact the voice coil.

Therefore, the elastic damping sheet is added at the bottom of the voice coil to serve as a structure for stabilizing vibration, so that two ends of the voice coil are respectively attached to the vibrating diaphragm and the elastic damping sheet, and the voice coil has better balance force during reciprocating movement. And the structure that the voice coil is restricted up and down is formed by the vibrating diaphragm and the elastic damping sheet, so that the vibration of the voice coil is more stable, and the vibration and the linearization are more stable under the high-power condition.

The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for anyone skilled in the art to understand the technical contents of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by anyone skilled in the art according to the disclosure, claims and drawings of the present specification.

Drawings

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

Fig. 2 is a partially exploded bottom view of a micro-speaker according to an embodiment of the present invention.

Fig. 3 is an exploded view of a micro-speaker according to an embodiment of the invention.

Fig. 4 is a schematic partial cross-sectional view of a micro-speaker according to an embodiment of the present invention.

Description of the symbols

100 micro-speaker

1 hollow frame

10 hollow part

11 top surface

12 bottom surface

2 vibrating diaphragm

21 outer peripheral portion

22 center part

3 Voice coil

31 top edge

32 bottom edge

4 elastic damping fin

41 external fixing piece

42 inner fixing piece

43 elastic sheet body

431. 531 bending section

5 symmetrical damping fin

51 outer end

52 inner end

53 damping sheet

6 base

601. 602, 603, 604 fixing seat

611. 612, 613 and 614 air holes

7 magnetic return component

Detailed description of the invention

Referring to fig. 1 to 4, fig. 1 is an external view of a micro-speaker according to an embodiment of the present invention, fig. 2 is a partially exploded bottom view of the micro-speaker according to the embodiment of the present invention, fig. 3 is an exploded view of the micro-speaker according to the embodiment of the present invention, and fig. 4 is a partially sectional view of the micro-speaker according to the embodiment of the present invention. As shown in fig. 2 and 3, the micro-speaker 100 of the present embodiment includes a hollow frame 1, a diaphragm 2, a voice coil 3, an elastic damping plate 4, and a magnetic return component 7.

As shown in fig. 3, the hollow frame 1 includes a hollow portion 10 and opposite top and bottom surfaces 11 and 12, and the hollow portion 10 is connected between the top and bottom surfaces 11 and 12. The diaphragm 2 includes an outer peripheral portion 21 and a central portion 22, and the outer peripheral portion 21 surrounds the outer periphery of the central portion 22. The outer peripheral portion 21 covers the top surface 11 of the hollow frame 1. When the diaphragm 2 is covered on the hollow frame 1, the diaphragm can be adhered by gluing, thermal welding or ultrasonic welding, so that the outer periphery 21 of the diaphragm 2 is fixed on the top surface 11 of the hollow frame 1.

The voice coil 3 is coaxially disposed in the hollow portion 10 of the hollow frame 1. The voice coil 3 comprises opposite top and

bottom edges

31, 32, the top edge 31 being fixedly connected to the central portion 22 of the diaphragm 2. As can be seen from fig. 2, the magneto-return element 7 is accommodated in the hollow portion 10 of the hollow frame 1, and the magneto-return element 7 is located inside the voice coil 3 and does not contact the voice coil 3.

Next, referring to fig. 2 and fig. 3, the elastic damping sheet 4 includes an outer fixing member 41, an inner fixing member 42 and an elastic sheet 43. The outer fixing member 41 is fixedly attached to the bottom surface 12 of the hollow frame 1, and the inner fixing member 42 is fixedly attached to the bottom edge 32 of the voice coil 3. The elastic sheet body 43 is connected between the outer fixing member 41 and the inner fixing member 42.

Therefore, the elastic damping sheet 4 is added to the bottom edge 32 of the voice coil 3 to serve as a structure for stabilizing vibration, so that two ends of the voice coil 3 are respectively attached to the vibrating diaphragm 2 and the elastic damping sheet 4, and the voice coil 3 has better balance force during reciprocating movement. And because the structure that the voice coil 3 is restricted up and down is formed by the vibrating diaphragm 2 and the elastic damping sheet 4, the vibration of the voice coil 3 can be more stable, and the vibration and the linearization are more stable under the condition of high power.

The elastic damping plate 4 may be a set disposed at any corner, so long as the outer fixing member 41 and the inner fixing member 42 of the elastic damping plate 4 are respectively fixed to the bottom surface 12 of the hollow frame 1 and the bottom edge 32 of the voice coil 3. Through fixing the outer fixing member 41 of the elastic damping plate 4 to the fixed hollow frame 1, fixing the inner fixing member 42 to the voice coil 3 capable of vibrating back and forth, and connecting the elastic plate 43 between the outer fixing member 41 and the inner fixing member 42, the inner fixing member 42 can provide a damping effect when vibrating back and forth along with the voice coil 3, so that the vibration of the voice coil 3 is more stable.

In order to provide a more balanced and stable damping effect of the voice coil 3 and to allow the voice coil 3 to reciprocate in the same axial direction as the diaphragm 2 without wobbling. In this embodiment, the micro-speaker 100 further includes a symmetric damper 5. The symmetrical damping fins 5 are arranged at one symmetrical end of the hollow frame 1 relative to the elastic damping fins 4. As shown in fig. 3, in the present embodiment, since the diaphragm 2 is rectangular, the hollow frame 1 is a corresponding rectangular frame, and the voice coil 3 is also correspondingly rectangular. However, in other embodiments, the hollow frame 1 may also be a circular frame, and in this case, the diaphragm 2 and the voice coil 3 are both of a circular structure.

In the present embodiment, the elastic damping fin 4 is disposed at one corner of the hollow frame 1 having a rectangular frame, and although a single elastic damping fin 4 is disposed to provide a damping effect for the voice coil 3, if a more balanced and stable damping effect for the voice coil 3 is desired, one or more sets of symmetrical damping fins 5 may be disposed to achieve the purpose.

For example, the symmetrical damping fins 5 may be disposed at diagonal lines where the elastic damping fins 4 are disposed, or the symmetrical damping fins 5 may be disposed at symmetrical corners of adjacent sides of the elastic damping fins 4. In the present embodiment, symmetrical damping fins 5 are disposed at the remaining three corners of the rectangle. The symmetrical damping fin 5 includes an outer end 51, an inner end 52 and a damping fin body 53. The outer end 51 is fixedly attached to the bottom surface 12 of the hollow frame 1 and the inner end 52 is fixedly attached to the bottom edge 32 of the voice coil 3. Damping blade body 53 is connected between outer end 51 and inner end 52.

The symmetrical damper 5 and the elastic damper 4 may have the same or similar structures. In the connection, the outer end 51 is also fixedly connected to the bottom surface 12 of the hollow frame 1, and the inner end 52 is fixedly connected to the bottom edge 32 of the voice coil 3. That is, the outer end 51 and the inner end 52 of the symmetric damping fin 5 are respectively and fixedly connected to the bottom surface 12 of the hollow frame 1 and the bottom edge 32 of the voice coil 3, so as to provide a damping effect when the voice coil 3 vibrates back and forth, and to make the vibration of the voice coil 3 more stable. Furthermore, the elastic damping fins 4 or the symmetrical damping fins 5 are provided at all four corners to provide better balance force of the voice coil 3 during the reciprocating movement. Moreover, when the voice coil 3 drives the diaphragm 2 to move up and down, the voice coil 3 and the diaphragm 2 can keep coaxial relative displacement in the axial direction without deflection.

Further, in the present embodiment, as can be seen from fig. 3, the three symmetric damping fins 5 are respectively a first symmetric damping fin 5 (the lowest one of the three symmetric damping fins 5 is seen in fig. 3), a second symmetric damping fin 5 (the leftmost one of the three symmetric damping fins 5 is seen in fig. 3), and a third symmetric damping fin 5 (the uppermost one of the three symmetric damping fins 5 is seen in fig. 3), and the three symmetric damping fins 5 and the elastic damping fin 4 form a single annular structure. The first symmetric damping fin 5 comprises a first outer end 51, a first inner end 52 and a first damping fin body 53, wherein the first outer end 51 is fixedly connected to the bottom surface 12 of the hollow frame 1, the first inner end 52 is fixedly connected to the bottom edge 32 of the voice coil 3, and the first damping fin body 53 is connected between the outer end and the inner end. The second symmetric damping fin 5 includes a second outer end 51, a second inner end 52 and a second damping fin body 53, the second outer end 51 is fixedly connected to the bottom surface 12 of the hollow frame 1, the second inner end 52 is fixedly connected to the bottom edge 32 of the voice coil 3, and the second damping fin body 53 is connected between the second outer end 51 and the second inner end 52. The third symmetric damping fin 5 includes a third outer end 51, a third inner end 52 and a third damping fin body 53, the third outer end 51 is fixedly connected to the bottom surface 12 of the hollow frame 1, the third inner end 52 is fixedly connected to the bottom edge 32 of the voice coil 3, and the third damping fin body 53 is connected between the third outer end 51 and the third inner end 52. The first outer end 51 is connected to the outer fixing member 41, the first inner end 52 is connected to the second inner end 52, the second outer end 51 is connected to the third outer end 51, the third inner end 52 is connected to the inner fixing member 42, the inner fixing member 42 is not connected to the first inner end 52, and the second inner end 52 is not connected to the third inner end 52, so that the first symmetric damping fin 5, the second symmetric damping fin 5, the third symmetric damping fin 5 and the elastic damping fin 4 form a single annular structure. In other embodiments, each symmetrical damper 5 and the elastic damper 4 may not be connected together, but disconnected and separately disposed. It is also possible to form the symmetrical damper 5 and the elastic damper 4 as a single ring structure as in the present embodiment. The integrally connected ring structure can complete the arrangement of the symmetrical damping fins 5 and the elastic damping fins 4 at four corners at one time during the manufacturing or assembling process, and does not need to be manufactured and assembled one by one, thereby reducing the required manufacturing elements and saving the assembling process and working hours.

Referring to fig. 2 and fig. 3 again, the elastic sheet 43 of the elastic damping sheet 4 includes a bending section 431, and an extension length of the bending section 431 is greater than a linear distance between the outer fixing member 41 and the inner fixing member 42. In the present embodiment, the bending portion 431 is a U-shaped sheet. In other embodiments, the bending portion 431 may also be a S-shaped sheet, an arc-shaped sheet, or other bending shapes. By using the suspended bending section 431 with a certain deformation, a good elastic deformation amplitude can be provided during the up-and-down reciprocating motion of the voice coil 3.

Similarly, the damping sheet body 53 of the symmetrical damping sheet 5 may also include a bending section 531, and the extension length of the bending section 531 is greater than the linear distance between the outer end 51 and the inner end 52. In the embodiment, the bending portion 531 is a U-shaped sheet, but the invention is not limited thereto. The bending portion 531 may be a S-shaped sheet or an arc-shaped sheet, as long as it can provide elastic force.

It should be noted that, as shown in fig. 3 and described above, the bending sections 431 and 531 are both planar, so that the whole of the elastic damping piece 4 and the symmetrical damping piece 5 are both planar. When the elastic damping fins 4 and the symmetrical damping fins 5 are integrally connected into a ring structure, the whole ring structure is also formed into a plane. Because of the planar structure, the die can be directly formed by one-time stamping, and is very convenient to manufacture. Moreover, because the damping plate is in a whole annular plane shape, the damping plate can be connected to the bottom ends of the hollow frame 1 and the voice coil 3 through a simple attaching procedure during assembly, so that the assembly of the symmetrical damping plate 5 and the elastic damping plate 4 is quicker.

In addition, the outer fixing member 41 of the elastic damping fin 4 includes a glue layer, which is glued and fixed to the bottom surface 12 of the hollow frame 1. The inner fixing member 42 of the elastic damping plate 4 may also comprise a glue layer, which is glued to the bottom edge 32 of the voice coil 3. Likewise, the outer ends 51 of the symmetrical damping fins 5 comprise a glue layer, which is glued to the bottom surface 12 of the hollow frame 1. The inner end 52 of the symmetrical damper 5 comprises a glue layer which is glued to the bottom edge 32 of the voice coil 3. Therefore, the elastic damper 4 and the symmetric damper 5 are fixed by gluing. In other embodiments, the elastic damping plate 4 and the symmetric damping plate 5 may be fixed to the bottom surface 12 of the hollow frame 1 and the bottom edge 32 of the voice coil 3 by thermal welding, ultrasonic welding, clamping, hooking, or the like.

In the assembly process, the diaphragm 2 and the hollow frame 1 may be fixed first. Then, after the voice coil 3 is placed in a predetermined position of the hollow frame 1 (i.e. the hollow portion 10 of the hollow frame 1), an adhesive layer is coated on the outer fixing member 41 and the inner fixing member 42 of the elastic damping plate 4, and an adhesive layer is coated on the outer end 51 and the inner end 52 of the symmetrical damping plate 5. And then the elastic damping fin 4 and the symmetric damping fin 5 are aligned and adhered to the hollow frame 1 and the voice coil 3, thus completing the assembly of the elastic damping fin 4 and the symmetric damping fin 5.

In other embodiments, an adhesive layer may be coated on the bottom surface 12 of the hollow frame 1 and the bottom edge 32 of the voice coil 3, and then the elastic damping plate 4 and the symmetric damping plate 5 are aligned and adhered to the hollow frame 1 and the voice coil 3.

Referring to fig. 2 to fig. 4, in the present embodiment, the micro-speaker 100 further includes a base 6, the base 6 includes a plurality of fixing

bases

601, 602, 603, and 604, and the fixing

bases

601, 602, 603, and 604 are respectively fixedly connected to the hollow frame 1. The fixing

bases

601, 602, 603, and 604 may be formed into a sheet-like structure by press-molding, and then the four sides are bent upward to form the fixing

bases

601, 602, 603, and 604. As can be seen from fig. 2 and 4, in the present embodiment, the fixing

bases

601, 602, 603, and 604 are inserted between the hollow frame 1 and the voice coil 3. However, in other embodiments, the fixing

bases

601, 602, 603, and 604 may be sleeved outside the hollow frame 1.

Further, as shown in fig. 2 and 3, the base 6 has a plurality of

ventilation holes

611, 612, 613, and 614 respectively corresponding to four corners of the rectangle, so as to release air pressure when the diaphragm 2 vibrates. The air holes 611, 612, 613 and 614 can be formed by using the fixing

bases

601, 602, 603 and 604 with shorter lengths, so that the air holes can be naturally formed between the two fixing bases after the bending is formed. In addition, the plurality of

ventilation holes

611, 612, 613, 614 can also respectively correspond to the elastic sheet body 43 of the elastic damping sheet 4 or the damping sheet body 53 of the symmetric damping sheet 5 to provide a deformation space required for the bending sections 431, 531 of the elastic sheet body 43 and the damping sheet body 53 to elastically deform.

Although the present invention has been described with reference to the foregoing embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A micro-speaker, comprising:

the hollow frame comprises a hollow part, a top surface and a bottom surface which are opposite to each other, and the hollow part is communicated between the top surface and the bottom surface;

a diaphragm including an outer peripheral portion and a central portion, the outer peripheral portion surrounding the periphery of the central portion, the outer peripheral portion covering the top surface of the hollow frame;

the voice coil is coaxially arranged in the hollow part of the hollow frame and comprises a top edge and a bottom edge which are opposite, and the top edge is fixedly connected with the central part of the vibrating diaphragm;

the elastic damping sheet comprises an outer fixing piece, an inner fixing piece and an elastic sheet body, wherein the outer fixing piece is fixedly connected to the bottom surface of the hollow frame, the inner fixing piece is fixedly connected to the bottom edge of the voice coil, and the elastic sheet body is connected between the outer fixing piece and the inner fixing piece;

the first symmetrical damping fin is assembled on the rectangular hollow frame and comprises a first outer end, a first inner end and a first damping fin body, the first outer end is fixedly connected to the bottom surface of the hollow frame, the first inner end is fixedly connected to the bottom edge of the voice coil, and the first damping fin body is connected between the first outer end and the first inner end;

the second symmetrical damping fin is assembled on the rectangular hollow frame and comprises a second outer end, a second inner end and a second damping fin body, the second outer end is fixedly connected to the bottom surface of the hollow frame, the second inner end is fixedly connected to the bottom edge of the voice coil, and the second damping fin body is connected between the second outer end and the second inner end;

the third symmetrical damping fin is assembled on the rectangular hollow frame and comprises a third outer end, a third inner end and a third damping fin body, the third outer end is fixedly connected to the bottom surface of the hollow frame, the third inner end is fixedly connected to the bottom edge of the voice coil, and the third damping fin body is connected between the third outer end and the third inner end; and

the magnetic return assembly is accommodated in the hollow part of the hollow frame, is positioned in the voice coil and does not contact the voice coil;

the first outer end is connected with the outer fixing piece, the first inner end is connected with the second inner end, the second outer end is connected with the third outer end, the third inner end is connected with the inner fixing piece, the inner fixing piece is not connected with the first inner end, and the second inner end is not connected with the third inner end, so that the first symmetrical damping sheet, the second symmetrical damping sheet, the third symmetrical damping sheet and the elastic damping sheet form a single annular structure.

2. The micro-speaker as claimed in claim 1, wherein the elastic damping plate comprises a bent portion extending a length greater than a linear distance between the outer fixing member and the inner fixing member.

3. The micro-speaker of claim 2, wherein the bent section is a U-shaped piece.

4. The micro-speaker as claimed in claim 1, wherein the outer fixing member of the elastic damping sheet comprises a glue layer, and the glue layer is glued and fixed on the bottom surface of the hollow frame.

5. The microspeaker of claim 1 wherein the inner fixing member of the elastic damping plate comprises a glue layer, the glue layer is glued and fixed to the bottom edge of the voice coil.

6. The micro-speaker as claimed in claim 1, wherein the hollow frame is a rectangular frame or a circular frame.

7. The micro-speaker as claimed in claim 1, further comprising a base, wherein the base comprises a plurality of fixing bases, and the fixing bases are respectively fixedly connected to the hollow frame.

8. The micro-speaker as claimed in claim 7, wherein the base has a plurality of ventilation holes.

9. The micro-speaker as claimed in claim 8, wherein one of the ventilation holes corresponds to the elastic sheet of the elastic damping sheet.