Miniature loudspeaker

Abstract

The miniature loudspeaker comprises a yoke, a central magnetic structure, an inner side magnetic structure, an outer side magnetic structure, a high pitch unit and a low pitch unit, the inner side magnetic structure comprises an inner annular washer, a first inner side magnetic steel and a second inner side magnetic steel, and the inner annular washer is integrally in a rectangular frame shape. A group of opposite sides of the inner annular washer are respectively connected with first inner side magnetic steel, the other group of opposite sides of the inner annular washer are respectively connected with second inner side magnetic steel, the bottom surface of the first inner side magnetic steel is connected with the yoke, a gap is formed between the second inner side magnetic steel and the yoke, and a bass magnetic gap is formed between the inner side magnetic structure and the central magnetic structure; the outer side magnetic structure comprises an outer annular washer and outer side magnetic steel, the outer side magnetic steel is connected with the outer annular washer and the yoke, the outer side magnetic steel is located on the outer side of the first inner side magnetic steel, and a high pitch magnetic gap is formed between the outer side magnetic steel and the first inner side magnetic steel. The miniature loudspeaker is provided with the high pitch unit and the low pitch unit at the same time, and can meet the high requirement of a user for the sound quality of the electro-acoustic converter.

Description

Technical Field

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

[0002] Nowadays, mobile terminals such as mobile phones and tablets enrich people's lives, and micro speakers play an indispensable role as audio devices.

[0003] As consumers have higher and higher requirements for the sound quality and loudness of the whole machine, the requirements for micro speakers are also further improved. In order to achieve a better experience, multiple micro speakers are often placed in a speaker, including a woofer, a midrange unit and a tweeter. The filter can filter out the redundant frequency bands and retain the desired effective bandwidth. Although the sound quality has improved, the size of the speaker has also increased and become bulky, and the cost has also increased. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a miniature loudspeaker having both a tweeter unit and a bass unit.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a miniature speaker, comprising:

[0006] Bracket;

[0007] A yoke, wherein the brackets are respectively provided at both ends of the yoke;

[0008] A central magnetic structure, wherein the central magnetic structure is disposed on the yoke;

[0009] An inner edge magnetic structure, the inner edge magnetic structure comprises an inner ring washer, a first inner edge magnetic steel and a second inner edge magnetic steel, the inner ring washer is in a rectangular frame shape as a whole, a group of opposite sides of the inner ring washer are respectively connected to the first inner edge magnetic steel, another group of opposite sides of the inner ring washer are respectively connected to the second inner edge magnetic steel, the bottom surface of the first inner edge magnetic steel is connected to the yoke, a gap is formed between the second inner edge magnetic steel and the yoke, and a bass magnetic gap is formed between the inner edge magnetic structure and the central magnetic structure;

[0010] An outer magnetic structure, the outer magnetic structure comprising an outer ring washer and an outer magnetic steel, the outer magnetic steel connecting the outer ring washer and the yoke, the outer magnetic steel being located on the outer side of the first inner magnetic steel and forming a treble magnetic gap with the first inner magnetic steel, the outer ring washer being connected to the bracket;

[0011] A tweeter unit, the tweeter unit comprising a tweeter diaphragm, a tweeter middle sticker and a tweeter voice coil, the tweeter diaphragm and the tweeter middle sticker are respectively in the shape of a ring frame, the inner edge of the tweeter diaphragm is connected to the tweeter middle sticker and the tweeter voice coil, the outer edge of the tweeter diaphragm is connected to the outer annular washer, and the tweeter voice coil moves in the tweeter magnetic gap;

[0012] A woofer unit comprises a woofer middle sticker, a woofer voice coil and a woofer diaphragm respectively connected to the woofer middle sticker, the woofer voice coil and the treble middle sticker, and the woofer voice coil moves in the woofer magnetic gap.

[0013] Furthermore, it also includes a supporting auxiliary membrane arranged in the gap, the inner edge of the supporting auxiliary membrane is connected to the bass voice coil, and the outer edge of the supporting auxiliary membrane is connected to the bracket.

[0014] Furthermore, the support is provided with a notch, and the connection between the supporting auxiliary membrane and the support is located in the notch.

[0015] Furthermore, the first inner magnetic steel is connected to the long axis side of the inner annular washer.

[0016] Furthermore, the central magnetic structure includes a central magnetic steel and a central washer, and the central magnetic steel connects the central washer and the yoke.

[0017] Furthermore, the bottom surface of the yoke is coplanar with the bottom surface of the bracket.

[0018] Furthermore, the treble middle sticker and the woofer middle sticker are made of different materials.

[0019] Furthermore, the wall thickness of the woofer voice coil is greater than the wall thickness of the treble voice coil, and the height of the woofer voice coil is greater than the height of the treble voice coil.

[0020] Furthermore, the stiffness of the bass diaphragm is lower than the stiffness of the tweeter diaphragm.

[0021] Furthermore, the outer annular washer has a protruding surrounding wall, and the outer edge of the tweeter diaphragm is connected to the surrounding wall.

[0022] The beneficial effects of the utility model are as follows: the micro speaker has a novel structure, has a tweeter and a woofer, is conducive to optimizing the space occupied by the whole machine, conforms to the development trend of thin and light electronic equipment, and meets the high requirements of users for the sound quality of electroacoustic converters. The independent bilateral magnetic structure is adopted, which reduces the difficulty of manufacturing magnetic steel and is conducive to controlling the production cost of the micro speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a micro speaker according to Embodiment 1 of the present utility model;

[0024] Figure 2 is a cross-sectional view of the micro-speaker of the first embodiment of the utility model;

[0025] Figure 3 A cross-sectional view of the micro-speaker of the first embodiment of the utility model from another perspective;

[0026] Figure 4 It is a structural schematic diagram of a part of the structure of the micro speaker according to the first embodiment of the utility model.

[0027] Description of labels:

[0028] 1. Bracket; 11. Notch;

[0029] 2. Yoke iron;

[0030] 3. Central magnetic structure;

[0031] 4. Inner magnetic structure; 41. Inner ring washer; 42. First inner magnetic steel; 43. Second inner magnetic steel;

[0032] 5. External magnetic structure; 51. External annular washer; 511. Surrounding wall; 52. External magnetic steel;

[0033] 6. Tweeter unit; 61. Tweeter diaphragm; 62. Tweeter mid-strip; 63. Tweeter voice coil;

[0034] 7. Bass unit; 71. Bass diaphragm; 72. Bass center sticker; 73. Bass voice coil;

[0035] 8. Support the secondary film. DETAILED DESCRIPTION

[0036] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0037] Please refer to Figures 1 to 4 , a micro speaker, comprising:

[0038] Bracket 1;

[0039] A yoke 2, wherein the brackets 1 are respectively disposed at both ends of the yoke 2;

[0040] A central magnetic structure 3, wherein the central magnetic structure 3 is arranged on the yoke 2;

[0041] An inner magnetic structure 4, wherein the inner magnetic structure 4 comprises an inner annular washer 41, a first inner magnetic steel 42 and a second inner magnetic steel 43, wherein the inner annular washer 41 is in the shape of a rectangular frame as a whole, wherein one group of opposite sides of the inner annular washer 41 are respectively connected to the first inner magnetic steel 42, and another group of opposite sides of the inner annular washer 41 are respectively connected to the second inner magnetic steel 43, wherein the bottom surface of the first inner magnetic steel 42 is connected to the yoke 2, and a gap is formed between the second inner magnetic steel 43 and the yoke 2, and a bass magnetic gap is formed between the inner magnetic structure 4 and the central magnetic structure 3;

[0042] An outer magnetic structure 5, the outer magnetic structure 5 includes an outer ring washer 51 and an outer magnetic steel 52, the outer magnetic steel 52 connects the outer ring washer 51 and the yoke 2, the outer magnetic steel 52 is located on the outer side of the first inner magnetic steel 42 and forms a treble magnetic gap with the first inner magnetic steel 42, and the outer ring washer 51 is connected to the bracket 1;

[0043] A tweeter unit 6, the tweeter unit 6 comprises a tweeter diaphragm 61, a tweeter middle sticker 62 and a tweeter voice coil 63, the tweeter diaphragm 61 and the tweeter middle sticker 62 are respectively in the shape of a ring frame, the inner edge of the tweeter diaphragm 61 is connected to the tweeter middle sticker 62 and the tweeter voice coil 63, the outer edge of the tweeter diaphragm 61 is connected to the outer annular washer 51, and the tweeter voice coil 63 moves in the tweeter magnetic gap;

[0044] The bass unit 7 includes a bass middle sticker 72, a bass voice coil 73 and a bass diaphragm 71 respectively connected to the bass middle sticker 72, the bass voice coil 73 and the treble middle sticker 62, and the bass voice coil 73 moves in the bass magnetic gap.

[0045] From the above description, it can be seen that the beneficial effects of the utility model are: the micro speaker has a novel structure, and has both a tweeter unit 6 and a woofer unit 7, which is conducive to optimizing the space occupied by the whole machine, conforming to the development trend of thin and light electronic equipment, and meeting the high requirements of users for the sound quality of the electroacoustic converter. The use of an independent bilateral magnetic structure reduces the difficulty of manufacturing the magnetic steel, which is conducive to controlling the production cost of the micro speaker.

[0046] Furthermore, it also includes a supporting auxiliary membrane 8 arranged at the gap, the inner edge of the supporting auxiliary membrane 8 is connected to the bass voice coil 73, and the outer edge of the supporting auxiliary membrane 8 is connected to the bracket 1.

[0047] From the above description, it can be seen that the setting of the supporting auxiliary membrane 8 can improve the rolling vibration and polarization phenomenon of the bass voice coil 73, which is beneficial to improving the acoustic performance of the micro speaker. The use of the supporting auxiliary membrane 8 to support the bass voice coil 73 can optimize the KMS linearity, and at the same time can increase the amplitude vibration space and increase the low-frequency sound pressure radiation energy. The supporting auxiliary membrane 8 bypasses the second inner edge magnetic steel 43 and is connected and fixed to the bracket 1, so that the volume of the second inner edge magnetic steel 43 can be set larger, thereby improving the BL value and linearity of the micro speaker, thereby improving the loudness of the micro speaker.

[0048] Furthermore, a notch 11 is provided on the support 1 , and a connection between the supporting auxiliary membrane 8 and the support 1 is located in the notch 11 .

[0049] From the above description, it can be seen that bonding the supporting sub-film 8 to the bracket 1 made of plastic material can facilitate the magnetic circuit bonding process and reduce the difficulty of the process and reduce the cost; the presence of the notch 11 can facilitate the positioning and installation of the supporting sub-film 8.

[0050] Furthermore, the first inner magnetic steel 42 is connected to the long axis side of the inner annular washer 41 .

[0051] From the above description, it can be seen that in the inner side magnetic structure 4, the first side magnetic steel arranged along the length direction has a larger overall volume, which is beneficial to improving the overall magnetic field strength of the inner side magnetic structure 4, thereby improving the performance of the micro speaker to a greater extent.

[0052] Furthermore, the central magnetic structure 3 includes a central magnetic steel and a central washer, and the central magnetic steel connects the central washer and the yoke 2 .

[0053] Furthermore, the bottom surface of the yoke 2 is coplanar with the bottom surface of the bracket 1 .

[0054] It can be seen from the above description that the bottom surface of the yoke 2 is coplanar with the bottom surface of the bracket 1, which can reduce the material used for the yoke 2 and thus control the cost of the micro speaker.

[0055] Furthermore, the treble middle sticker 62 and the woofer middle sticker 72 are made of different materials.

[0056] Furthermore, the wall thickness of the bass voice coil 73 is greater than the wall thickness of the treble voice coil 63 , and the height of the bass voice coil 73 is greater than the height of the treble voice coil 63 .

[0057] Furthermore, the stiffness of the bass diaphragm 71 is lower than the stiffness of the tweeter diaphragm 61 .

[0058] Furthermore, the outer annular washer 51 has a protruding surrounding wall 511 , and the outer edge of the tweeter diaphragm 61 is connected to the surrounding wall 511 .

[0059] It can be seen from the above description that the existence of the surrounding wall 511 can prevent the tweeter diaphragm 61 from colliding with the outer annular washer 51 when in motion.

[0060] Embodiment 1

[0061] Please refer to Figures 1 to 4 , Embodiment 1 of the present utility model is: a miniature speaker that can be applied to electronic products such as mobile phones, tablet computers, smart watches, etc.

[0062] The micro speaker includes a bracket 1, a yoke 2, a central magnetic structure 3, an inner magnetic structure 4, an outer magnetic structure 5, a tweeter 6 and a woofer 7. The bracket 1 is respectively provided at both ends of the yoke 2, and the central magnetic structure 3 is provided on the yoke 2; the inner magnetic structure 4 includes an inner ring washer 41, a first inner magnetic steel 42 and a second inner magnetic steel 43. The inner ring washer 41 is in a rectangular frame shape as a whole. A group of opposite sides of the inner ring washer 41 are respectively connected to the first inner magnetic steel 42, and another group of opposite sides of the inner ring washer 41 are respectively connected to the second inner magnetic steel 43. The bottom surface of the first inner magnetic steel 42 is connected to the yoke 2, and a gap is formed between the second inner magnetic steel 43 and the yoke 2. A bass magnetic gap is formed between the inner magnetic structure 4 and the central magnetic structure 3; the outer magnetic structure 5 includes an outer ring washer 51 and an outer magnetic steel 52 , the outer magnetic steel 52 connects the outer annular washer 51 and the yoke 2, the outer magnetic steel 52 is located on the outer side of the first inner magnetic steel 42 and forms a treble magnetic gap with the first inner magnetic steel 42, the outer annular washer 51 is connected to the bracket 1; the tweeter unit 6 includes a tweeter diaphragm 61, a tweeter middle sticker 62 and a tweeter voice coil 63, the tweeter diaphragm 61 and the tweeter middle sticker 62 are respectively in the shape of a ring frame, the inner edge of the tweeter diaphragm 61 is connected to the tweeter middle sticker 62 and the tweeter voice coil 63, the outer edge of the tweeter diaphragm 61 is connected to the outer annular washer 51, and the tweeter voice coil 63 moves in the tweeter magnetic gap; the bass unit 7 includes a bass middle sticker 72, a bass voice coil 73 and a bass diaphragm 71 respectively connected to the bass middle sticker 72, the bass voice coil 73 and the tweeter middle sticker 62, and the bass voice coil 73 moves in the bass magnetic gap.

[0063] In order to further increase the BL value of the micro speaker and improve the performance of the micro speaker, in this embodiment, the first inner edge magnetic steel 42 is connected to the long axis side of the inner annular washer 41, that is, the gap corresponds to the short axis side of the inner annular washer 41.

[0064] The micro speaker further includes a supporting auxiliary membrane 8 disposed at the gap, the inner edge of the supporting auxiliary membrane 8 is connected to the bass voice coil 73, and the outer edge of the supporting auxiliary membrane 8 is connected to the bracket 1. In detail, the middle area of ​​the supporting auxiliary membrane 8 is recessed downward to avoid the second inner edge magnetic steel 43.

[0065] To facilitate the bonding and fixing of the supporting auxiliary film 8 , in this embodiment, a notch 11 is provided on the bracket 1 , and the connection between the supporting auxiliary film 8 and the bracket 1 is located in the notch 11 .

[0066] The central magnetic structure 3 includes a central magnetic steel and a central washer. The central magnetic steel connects the central washer and the yoke 2 . The central washer is aligned or substantially aligned with the inner annular washer 41 .

[0067] The bottom surface of the yoke 2 is coplanar with the bottom surface of the bracket 1 , and the wall surface of the yoke 2 is bonded and fixed to the bracket 1 .

[0068] The treble middle sticker 62 and the bass middle sticker 72 are made of different materials. The bass middle sticker 72 is a middle sticker with heavier bass, and its material can be bakelite, aluminum + pmi sandwich composite structure, etc., which forms a bass band sound effect; the treble middle sticker 62 is a middle sticker with heavier treble, and its material can be high-density and high-strength materials such as stainless steel and magnesium-aluminum alloy.

[0069] The wall thickness of the bass voice coil 73 is greater than the wall thickness of the treble voice coil 63 , and the height of the bass voice coil 73 is greater than the height of the treble voice coil 63 .

[0070] The rigidity of the bass diaphragm 71 is lower than that of the tweeter diaphragm 61 . The bass diaphragm 71 has low rigidity, low strength, and high diaphragm compliance, while the tweeter diaphragm 61 has high rigidity, high strength, and low diaphragm compliance.

[0071] In order to prevent the tweeter diaphragm 61 from colliding with the outer annular washer 51 during vibration, in this embodiment, the outer annular washer 51 has a protruding surrounding wall 511, and the outer edge of the tweeter diaphragm 61 is connected to the surrounding wall 511. Preferably, the surrounding wall 511 is arranged along the outer edge of the outer annular washer 51.

[0072] In summary, the micro-speaker provided by the utility model has a novel structure and has both a tweeter and a woofer, which is conducive to optimizing the space occupied by the whole machine, conforms to the development trend of lightweight electronic equipment, and meets users' high requirements for the sound quality of electroacoustic converters. The use of an independent bilateral magnetic structure reduces the difficulty of manufacturing magnetic steel, which is conducive to controlling the production cost of micro-speakers. The setting of the supporting sub-membrane can improve the rolling vibration and polarization phenomenon of the bass voice coil, which is conducive to improving the acoustic performance of the micro-speaker. The notch on the bracket can facilitate the positioning and assembly of the supporting sub-membrane, which is conducive to improving production efficiency and production consistency.

[0073] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A micro speaker, characterized in that: include Bracket; A yoke, wherein the brackets are respectively provided at both ends of the yoke; A central magnetic structure, wherein the central magnetic structure is disposed on the yoke; An inner edge magnetic structure, the inner edge magnetic structure comprises an inner ring washer, a first inner edge magnetic steel and a second inner edge magnetic steel, the inner ring washer is in a rectangular frame shape as a whole, a group of opposite sides of the inner ring washer are respectively connected to the first inner edge magnetic steel, another group of opposite sides of the inner ring washer are respectively connected to the second inner edge magnetic steel, the bottom surface of the first inner edge magnetic steel is connected to the yoke, a gap is formed between the second inner edge magnetic steel and the yoke, and a bass magnetic gap is formed between the inner edge magnetic structure and the central magnetic structure; An outer magnetic structure, the outer magnetic structure comprising an outer ring washer and an outer magnetic steel, the outer magnetic steel connecting the outer ring washer and the yoke, the outer magnetic steel being located on the outer side of the first inner magnetic steel and forming a treble magnetic gap with the first inner magnetic steel, the outer ring washer being connected to the bracket; A tweeter unit, the tweeter unit comprising a tweeter diaphragm, a tweeter middle sticker and a tweeter voice coil, the tweeter diaphragm and the tweeter middle sticker are respectively in the shape of a ring frame, the inner edge of the tweeter diaphragm is connected to the tweeter middle sticker and the tweeter voice coil, the outer edge of the tweeter diaphragm is connected to the outer annular washer, and the tweeter voice coil moves in the tweeter magnetic gap; A woofer unit comprises a woofer middle sticker, a woofer voice coil and a woofer diaphragm respectively connected to the woofer middle sticker, the woofer voice coil and the treble middle sticker, and the woofer voice coil moves in the woofer magnetic gap.

2. The micro-speaker according to claim 1, characterized in that: It also includes a supporting auxiliary membrane arranged at the gap, the inner edge of the supporting auxiliary membrane is connected to the bass voice coil, and the outer edge of the supporting auxiliary membrane is connected to the bracket.

3. The micro-speaker according to claim 2, characterized in that: The support is provided with a notch, and the connection between the supporting auxiliary membrane and the support is located in the notch.

4. The micro-speaker according to claim 1, characterized in that: The first inner magnetic steel is connected to the long axis side of the inner annular washer.

5. The micro-speaker according to claim 1, characterized in that: The central magnetic structure includes a central magnetic steel and a central washer, and the central magnetic steel connects the central washer and the yoke.

6. The micro-speaker according to claim 1, characterized in that: The bottom surface of the yoke is coplanar with the bottom surface of the bracket.

7. The micro-speaker according to claim 1, characterized in that: The treble middle sticker and the bass middle sticker are made of different materials.

8. The micro-speaker according to claim 1, characterized in that: The wall thickness of the bass voice coil is greater than the wall thickness of the treble voice coil, and the height of the bass voice coil is greater than the height of the treble voice coil.

9. The micro-speaker according to claim 1, characterized in that: The rigidity of the bass diaphragm is lower than the rigidity of the tweeter diaphragm.

10. The micro-speaker according to claim 1, characterized in that: The outer annular washer has a protruding surrounding wall, and the outer edge of the tweeter diaphragm is connected to the surrounding wall.

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