Miniature loudspeaker without back box

Abstract

The invention discloses a back-box-free miniature loudspeaker, which comprises a frame body, drum paper, a magnetic circuit structure and a voice coil, and is characterized in that the drum paper is connected to the frame body, the magnetic circuit structure comprises a main magnetic part and a yoke covering and surrounding the main magnetic part, and magnetic gaps are arranged between the main magnetic part and a plurality of concave folding parts of the yoke; the main magnetic part is fixed on the yoke iron, the voice coil is sleeved on the periphery of the main magnetic part and penetrates into the magnetic gap, one end of the voice coil is fixedly connected with the vibrating diaphragm, a gap is formed between two adjacent concave folding parts, and the position, opposite to the gap, on the frame body is fixedly connected with the vibrating diaphragm. And a wall structure is arranged and seals the gap, so that a closed space is formed among the drum paper, the yoke and the frame body.

Description

Technical Field

[0001] This invention relates to the field of acoustic component technology, specifically a miniature loudspeaker that does not require a back box. Background Technology

[0002] A loudspeaker is a transducer that converts electrical signals into sound signals, and is an important acoustic component in electronic products. A loudspeaker typically consists of a driver unit combined with a speaker enclosure (or back enclosure). The loudspeaker driver unit may include a frame, a magnetic circuit system housed within the frame, and a vibration system. The vibration system includes a diaphragm and a voice coil located beneath the diaphragm. The voice coil drives the diaphragm to produce sound under the action of the magnetic circuit system.

[0003] Because of the limited internal space in electronic products, there is still a need in this field to further reduce the size of speakers. Summary of the Invention

[0004] The main objective of this invention is to provide a back-box-less miniature speaker that can overcome the shortcomings or disadvantages of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a backless miniature loudspeaker, comprising a frame, a diaphragm, a magnetic circuit structure, and a voice coil. The diaphragm includes a diaphragm and a suspension edge. The diaphragm is flexibly connected to one end of the frame via the suspension edge. The magnetic circuit structure includes a main magnet and a yoke covering and surrounding the main magnet. A magnetic gap is provided between a plurality of concave and convex portions of the main magnet and the yoke. The main magnet is fixed to the yoke. The voice coil is sleeved on the outer periphery of the main magnet and passes through the magnetic gap. One end of the voice coil is fixedly connected to the diaphragm. A gap is formed between two adjacent concave and convex portions. A wall structure is provided on the frame relative to the gap and seals the gap, forming a sealed space between the diaphragm, the yoke, and the frame.

[0007] According to an embodiment of the present invention, the plurality of concave folds are perpendicular to the bottom of the yoke.

[0008] According to an embodiment of the present invention, the plurality of concave folds have the same height.

[0009] According to an embodiment of the present invention, the yoke is fixed to the inner periphery of the frame by means of the plurality of concave folds.

[0010] According to an embodiment of the present invention, a vent hole is provided on the bottom of the yoke, and a breathable mesh is attached to the outside of the vent hole to balance the internal and external pressure.

[0011] According to an embodiment of the present invention, a washer is provided on the main magnetic part.

[0012] According to an embodiment of the present invention, a first central opening is provided in the main magnetic part, and a second central opening is provided in the washer.

[0013] According to an embodiment of the present invention, the first central opening is aligned with the second central opening.

[0014] According to an embodiment of the present invention, a breathable mesh is covered on the washer, and porous gas-absorbing material is filled in the first central opening and the second central opening.

[0015] According to an embodiment of the present invention, the porous gas absorbent material comprises zeolite.

[0016] According to an embodiment of the present invention, the zeolite is composed of silicon dioxide particles with a silicon-to-aluminum mass ratio greater than 200.

[0017] According to an embodiment of the present invention, the zeolite is an MFI zeolite type composed of pure silica or modified pure silica.

[0018] The miniature speaker of the present invention forms a sealed space between the drum, the yoke, and the frame through a special yoke structure and the wall structure on the yoke. Therefore, the back box can be omitted, and the size of the miniature speaker can be further reduced, making it more suitable for use in smaller or thinner electronic products. Attached Figure Description

[0019] Figure 1 This is a front side view of a miniature loudspeaker according to an embodiment of the present invention.

[0020] Figure 2 This is a rear side view of a miniature loudspeaker according to an embodiment of the present invention.

[0021] Figure 3 for Figure 1 A schematic diagram of the I-I' section of a miniature loudspeaker.

[0022] Figure 4 for Figure 1 An exploded view of a miniature speaker.

[0023] Figure 5 This is a cross-sectional schematic diagram of a miniature loudspeaker according to another embodiment of the present invention.

[0024] Figure 6 An exploded view of a miniature loudspeaker according to another embodiment of the present invention.

[0025] Figure 7 This is a cross-sectional schematic diagram of a miniature loudspeaker according to yet another embodiment of the present invention.

[0026] Figure 8 An exploded view of a miniature loudspeaker according to yet another embodiment of the present invention.

[0027] Explanation of reference numerals in the attached diagram: 1, 2, 3 - Miniature loudspeaker; 10 - Frame; 10p - Opening; 110a - Wall structure; 20 - Drum; 201 - Diaphragm; 202 - Suspension edge; 30 - Magnetic circuit structure; 301 - Main magnet; 301p - Central opening; 303 - Yoke; 303a - Concave section; 303b - Bottom; 303g - Gap; 305 - Washer; 305p - Central opening; 40 - Voice coil; G - Magnetic gap; SS - Sealed space; VH - Vent hole; PL - Vent mesh; PU - Vent mesh; ZL - Zeolite. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0029] In the description of this 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," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] Please see Figures 1 to 4 ,in, Figure 1 This is a front side view of a miniature loudspeaker according to an embodiment of the present invention. Figure 2 This is a rear side view of a miniature loudspeaker illustrated according to an embodiment of the present invention. Figure 3 for Figure 1 A schematic diagram of the I-I' section of a miniature loudspeaker. Figure 4 for Figure 1 An exploded view of a miniature speaker.

[0032] like Figures 1 to 4 As shown, the miniature loudspeaker 1 includes a frame 10 and a drum paper 20 disposed on the frame 10. According to an embodiment of the present invention, the drum paper 20 may include a diaphragm 201 and a surround 202 surrounding the diaphragm 201 with an arc-shaped or wavy cross-section. According to an embodiment of the present invention, the diaphragm 201 and the surround 202 may be made of different materials, but are not limited thereto.

[0033] According to an embodiment of the present invention, preferably, the diaphragm 201 of the diaphragm 20 is flexibly connected to one end of the frame 10 via a suspension edge 202. According to an embodiment of the present invention, the diaphragm 201 is elongated, meaning its length is greater than its width. According to an embodiment of the present invention, the frame 10 has an opening 10p adapted to the shape of the diaphragm 20, and the diaphragm 201 is connected to the frame 10 via an annular suspension edge 202 to seal the opening 10p, thus forming a suspension system at one end of the frame 10.

[0034] According to an embodiment of the present invention, a magnetic circuit structure 30 is provided within the frame 10, including a main magnetic part 301, a yoke 303 covering and surrounding the main magnetic part 301, and a washer 305 disposed on the main magnetic part 301 for conducting magnetism. According to an embodiment of the present invention, the main magnetic part 301 is fixed to the flat bottom 303b of the yoke 303. According to an embodiment of the present invention, as... Figure 3As shown, a magnetic gap G is provided between the main magnetic part 301 and the plurality of concave and folded portions 303a of the yoke 303. The concave and folded portions 303a are substantially perpendicular to the flat bottom 303b of the yoke 303 and have the same height. According to an embodiment of the present invention, the yoke 303 can be glued and fixed to the inner periphery of the frame 10 by means of the concave and folded portions 303a of the yoke 303.

[0035] like Figure 4 As shown, the yoke 303 has, for example, four discontinuous concave folds 303a, with gaps 303g formed between adjacent concave folds 303a. Four downwardly extending wall structures 110a are provided on the frame 10 relative to the four gaps 303g between the concave folds 303a of the yoke 303. During assembly, the wall structures 110a seal the corresponding gaps 303g, forming a sealed space SS between the diaphragm 20, the yoke 303, and the frame 10. Figure 2 and Figure 4 As shown, a vent hole VH is provided on the flat bottom 303b of the yoke 303, and a breathable mesh PL is attached to the outside of the vent hole VH to balance the internal and external pressure.

[0036] According to an embodiment of the present invention, a voice coil 40 is further provided inside the frame 10. According to an embodiment of the present invention, the voice coil 40 is formed by winding enameled wire separately, without the need for a voice coil bobbin. The voice coil 40 is fitted around the outer periphery of the main magnetic part 301 and passes through the magnetic gap G in the vertical direction. According to an embodiment of the present invention, the voice coil 40 is configured as an elongated shape, that is, its length dimension is greater than its width dimension, and one end of the voice coil 40 is fixedly connected to the diaphragm 201. Preferably, in an embodiment of the present invention, the center of the voice coil 40 is located on the central axis of the diaphragm 201 in the length direction. According to an embodiment of the present invention, the voice coil 40 can be connected to an external signal via a voice coil lead, and in conjunction with the magnetic field provided by the magnetic circuit structure 30, the voice coil 40 vibrates, driving the diaphragm 201 to vibrate and produce sound.

[0037] Because the miniature speaker 1 of the present invention forms a sealed space SS between the drum paper 20, the yoke 303 and the frame 10 through a special yoke 303 structure and the wall structure 110a on the yoke 303, the back box can be omitted, and the volume of the miniature speaker 1 can be further reduced, making it more suitable for use in smaller or thinner electronic products.

[0038] Please see Figures 5 to 6 ,in, Figure 5 This is a cross-sectional schematic diagram of a miniature loudspeaker according to another embodiment of the present invention. Figure 6 An exploded view of a miniature loudspeaker according to another embodiment of the present invention, wherein the same layers, regions, elements or materials are still represented by the same symbols.

[0039] like Figure 5 and Figure 6 As shown, the structure of the miniature speaker 2 is similar to Figure 3 and Figure 4 The main difference in the structure of the miniature loudspeaker 1 is that a central opening 301p is formed in the main magnet 301 of the miniature loudspeaker 2, and a central opening 305p is formed in the washer 305. According to an embodiment of the present invention, the central opening 301p penetrates the entire thickness of the main magnet 301, and the central opening 305p penetrates the entire thickness of the washer 305. According to an embodiment of the present invention, the central opening 301p of the main magnet 301 is aligned with the central opening 305p of the washer 305. By providing such a special structure, the volume of the sealed space SS can be increased, enabling the miniature loudspeaker 2 to provide better sound effects.

[0040] Those skilled in the art should understand Figure 5 and Figure 6 The single central opening 301p and single central opening 305p shown are for illustrative purposes only. In other embodiments, there may be more than one opening in the main magnet 301 and the washer 305.

[0041] Please see Figures 7 to 8 ,in, Figure 7 This is a cross-sectional schematic diagram of a miniature loudspeaker according to yet another embodiment of the present invention. Figure 8 This is an exploded view of a miniature loudspeaker according to yet another embodiment of the present invention, wherein the same layers, regions, elements or materials are still represented by the same symbols.

[0042] like Figure 7 and Figure 8 As shown, the structure of the miniature speaker 3 is similar to Figure 5 and Figure 6 The main difference in the structure of the miniature speaker 2 is that, in addition to the central opening 301p formed in the main magnet 301 and the central opening 305p formed in the washer 305, the miniature speaker 305 is covered with a breathable mesh fabric PU, and porous gas-absorbing materials such as zeolite ZL are filled into the central openings 301p and 305p to increase the virtual volume and achieve the effect of reducing the resonant frequency. According to an embodiment of the present invention, for example, the zeolite ZL may contain zeolite particles composed of silicon dioxide with a silicon-to-aluminum mass ratio greater than 200, or the zeolite ZL may not contain aluminum and may only be composed of pure silicon dioxide or MFI zeolite type modified from pure silicon dioxide.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A backless miniature loudspeaker, comprising a frame, a diaphragm, a magnetic circuit structure, and a voice coil, wherein, The drum includes a diaphragm and a suspension edge. The diaphragm is flexibly connected to one end of the frame via the suspension edge. The magnetic circuit structure includes a main magnetic part and a yoke covering and surrounding the main magnetic part. A magnetic gap is provided between a plurality of concave and folded portions of the main magnetic part and the yoke. The main magnetic part is fixed to the yoke. The voice coil is sleeved on the outer periphery of the main magnetic part and passes through the magnetic gap. One end of the voice coil is fixedly connected to the diaphragm. The characteristic feature is that: A gap is formed between two adjacent recessed folds. A wall structure is provided on the frame relative to the gap and seals the gap, so that a sealed space is formed between the drum paper, the yoke and the frame.

2. The miniature loudspeaker according to claim 1, characterized in that, The plurality of concave folds are perpendicular to the bottom of the yoke.

3. The miniature loudspeaker according to claim 1, characterized in that, The plurality of concave folds have the same height.

4. The miniature loudspeaker according to claim 1, characterized in that, The yoke is fixed to the inner periphery of the frame through the plurality of concave folds.

5. The miniature loudspeaker according to claim 1, characterized in that, A ventilation hole is provided at the bottom of the yoke, and a breathable mesh is attached to the outside of the ventilation hole to balance the internal and external pressure.

6. The miniature loudspeaker according to claim 1, characterized in that, A washer is provided on the main magnetic part.

7. The miniature loudspeaker according to claim 6, characterized in that, The main magnet has a first central opening, and the washer has a second central opening.

8. The miniature loudspeaker according to claim 7, characterized in that, The first central opening is aligned with the second central opening.

9. The miniature loudspeaker according to claim 7, characterized in that, A breathable mesh is covered on the washer, and porous gas-absorbing material is filled into the first central opening and the second central opening.

10. The miniature loudspeaker according to claim 9, characterized in that, The porous gas absorber material contains zeolite.

11. The miniature loudspeaker according to claim 10, characterized in that, The zeolite is composed of silicon dioxide particles with a silicon-to-aluminum mass ratio greater than 200.

12. The miniature loudspeaker according to claim 10, characterized in that, The zeolite is an MFI zeolite type composed of pure silica or modified pure silica.

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