Plane diaphragm loudspeaker

Abstract

The utility model discloses a plane diaphragm loudspeaker which comprises a support and a bonding pad. A sounding assembly is arranged in the bracket; the sounding assembly comprises a magnet, a vibrating diaphragm and a voice coil, the voice coil is connected to the vibrating diaphragm, and the vibrating diaphragm and the magnet are arranged at an interval; the support is provided with a containing cavity penetrating through the upper end and the lower end of the support, and an annular step is arranged in the containing cavity. The annular step is arranged in a protruding mode from the inner wall face of the support to one side of the containing cavity. The annular step is provided with a first avoiding notch for a lead of the voice coil to extend out; the magnet is arranged on the annular step; therefore, the loudspeaker is compact in overall structure, small in size, few in parts, low in assembly difficulty, high in production efficiency and low in production cost, and the thickness of the loudspeaker can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technology of the loudspeaker field, in particular to a flat diaphragm loudspeaker. Background Art

[0002] Compared with electrostatic speakers and dynamic speakers, planar diaphragm speakers are superior, with larger vibration area and better sound quality; planar diaphragm speakers combine the advantages of both dynamic and electrostatic transducer methods, and have better performance in low frequencies than electrostatic ones, and are also stronger than dynamic ones in high frequencies.

[0003] At present, all planar diaphragm speakers are of internal magnetic design, that is, they include an annular shell, a vibration assembly and a magnetic circuit assembly. The inner and outer edges of the annular vibration assembly are fixed on the shell. The magnetic circuit assembly includes a U-iron fixed in the shell, a magnet and a washer fixed in the U-iron, and a magnetic gap is formed between the magnet and the washer and the side wall of the U-iron. This internal magnetic planar diaphragm speaker uses the U-iron to assemble the magnet, which not only increases the difficulty of assembling the planar diaphragm speaker and reduces the production efficiency of the planar diaphragm speaker, but also has a lower BL value of the speaker. At the same time, it also makes the planar diaphragm speaker larger in size, which cannot meet the current trend of electronic products developing towards light, thin and compact, especially because it has more components, complex structure, great difficulty in assembly and high production cost.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0005] In view of this, the utility model aims to solve the deficiencies in the prior art, and its main purpose is to provide a planar diaphragm speaker, which has a hollow bracket and an annular step arranged in the accommodating cavity; it plays a good fixing and supporting role, so that its overall structure is compact, small in size, with fewer parts, low assembly difficulty, high production efficiency, low production cost, and can greatly reduce the thickness of the speaker, and the BL value of the speaker is higher.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A planar diaphragm speaker comprises a bracket and a pad for current to flow in and out; a sound-generating component is arranged in the bracket; the sound-generating component comprises a magnet, a diaphragm and a voice coil, the voice coil is connected to the diaphragm, and the diaphragm is spaced apart from the magnet;

[0008] The bracket has a receiving cavity that passes through the upper and lower ends of the bracket, and an annular step is arranged in the receiving cavity; the annular step is protruded from the inner wall surface of the bracket toward one side of the receiving cavity; the annular step is provided with a first avoidance groove for the lead wire of the voice coil to extend out; the magnet is installed on the annular step.

[0009] As a preferred solution, the width of the annular step is 0.1 mm-0.3 mm; the height of the annular step is 0.1 mm-0.3 mm.

[0010] As a preferred solution, the outer side of the bracket has a first mounting portion that is recessed inward, the first mounting portion has a height direction and a length direction that are perpendicular to each other, the height direction of the first mounting portion is parallel to the height direction of the bracket, and the inner side of the first mounting portion is connected to the accommodating cavity; the first mounting portion is used for mounting the pad; wherein the pad is integrally encapsulated and molded on the first mounting portion; the voice coil is electrically connected to the pad;

[0011] and / or

[0012] The outer side of the bracket has a second mounting portion recessed inwardly, the second mounting portion has a height direction and a length direction perpendicular to each other, the height direction of the second mounting portion is parallel to the height direction of the bracket, and the second mounting portion is used to facilitate subsequent side spot welding positioning of the speaker.

[0013] As a preferred solution, a first thickened portion is protruded from one end of the inner side of the first mounting portion close to the bracket;

[0014] and / or

[0015] A second thickened portion is protruded from one inner end of the second mounting portion close to the bracket; wherein the first thickened portion and the second thickened portion are arranged opposite to each other; and at least parts of the first thickened portion and the second thickened portion are in contact with the inner side surface of the annular step.

[0016] As a preferred solution, the first thickened portion and the second thickened portion both have avoidance surfaces on one side close to the diaphragm.

[0017] As a preferred solution, a second avoidance slot for extending the voice coil lead is further provided at the lower end of the bracket corresponding to the first mounting portion, and the second avoidance slot is connected to the accommodating cavity.

[0018] As a preferred solution, the pad includes a soldering piece portion for connecting to a lead of the voice coil and a conductive portion for electrically connecting to an external element.

[0019] As a preferred embodiment, the diaphragm includes a middle part and an outer ring part, the outer ring part is arranged around the outer circumference of the middle part, and a membrane ring is arranged on one side of the outer ring part; a center sticker is arranged on one side and / or the other side of the middle part, and the voice coil is glued to the middle part.

[0020] As a preferred solution, the annular step includes a first step surface and a second step surface that are arranged opposite to each other; the magnet includes a first magnet group and a second magnet group, and the first magnet group and the membrane ring are arranged on the first step surface;

[0021] The second magnet group is arranged on the second step surface to form a first annular gap, so that the diaphragm and the voice coil are installed in the first annular gap.

[0022] As a preferred embodiment, the bracket is provided with a sound outlet, the first magnet group includes a first inner magnet and a first outer magnet, the first inner magnet has a first inner ring hole, the first outer magnet has a first outer ring hole, the first outer magnet is sleeved on the first inner magnet through the first outer ring hole, and the outer wall of the first inner magnet and the inner wall of the first outer magnet form a second annular gap; the magnetic poles of one end of the first inner magnet close to the diaphragm and the other end away from the diaphragm are opposite, the magnetic poles of one end of the first outer magnet close to the diaphragm and the other end away from the diaphragm are opposite, and the magnetic poles of the same-side ends of the first inner magnet and the first outer magnet are opposite;

[0023] The second magnet group includes a second inner magnet and a second outer magnet, the second inner magnet has a second inner ring hole, the second outer magnet has a second outer ring hole, the second outer magnet is sleeved on the second inner magnet through the second outer ring hole, and the outer wall of the second inner magnet and the inner wall of the second outer magnet form a third annular gap; the sound outlet is connected to the first inner ring hole or the second inner ring hole;

[0024] The magnetic poles of one end of the second inner magnet close to the diaphragm and the other end away from the diaphragm are opposite, the magnetic poles of one end of the second outer magnet close to the diaphragm and the other end away from the diaphragm are opposite, and the magnetic poles of the second inner magnet and the second outer magnet on the same side are opposite; the magnetic poles of the opposite ends of the first inner magnet and the first outer magnet and the second inner magnet and the second outer magnet are the same.

[0025] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it is mainly achieved by arranging an annular step in the hollow bracket and the accommodating cavity; the magnet is installed on the annular step, which plays a good fixing and supporting role. In particular, this speaker adopts a U-iron-free design, so that a separate U-iron is no longer needed to support the magnet, so that its overall structure is compact, small in size, few in parts, low in assembly difficulty, high in production efficiency, low in production cost, and can greatly reduce the thickness of the speaker, effectively making the speaker thin; secondly, the magnet is located at the outermost side of the speaker, the magnetic field strength of the magnet is large, and the sensitivity of the speaker is high; and the annular step is provided with a first avoidance groove, so that the lead of the voice coil can be safely led out to prevent the membrane ring of the diaphragm from squeezing the lead of the voice coil.

[0026] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of an embodiment of the utility model;

[0028] Figure 2 It is a cross-sectional view of an embodiment of the utility model (single voice coil);

[0029] Figure 3 It is another cross-sectional view of an embodiment of the utility model;

[0030] Figure 4 It is another cross-sectional view of an embodiment of the utility model;

[0031] Figure 5 It is an exploded view of an embodiment of the utility model;

[0032] Figure 6 It is a top view of the bracket of the embodiment of the utility model;

[0033] Figure 7 It is a three-dimensional diagram of the bracket of the embodiment of the utility model;

[0034] Figure 8 is a cross-sectional view of a diaphragm according to an embodiment of the present utility model;

[0035] Fig. 9 It is a cross-sectional view of an embodiment of the utility model (dual voice coil);

[0036] Fig.10 It is another cross-sectional view of an embodiment of the utility model (dual voice coil);

[0037] Fig.11 It is another cross-sectional view of an embodiment of the present utility model (dual voice coil).

[0038] Description of the accompanying drawings:

[0039] 10. Bracket 11. Magnet

[0040] 111. First magnet group 112. Second magnet group

[0041] 1111, first inner magnet 1112, first outer magnet

[0042] 1121, second inner magnet 1122, second outer magnet

[0043] 12. Diaphragm 13. Voice coil

[0044] 121, middle part 122, outer ring part

[0045] 123, membrane ring 124, middle sticker

[0046] 14. Accommodation cavity 15. Annular step

[0047] 16. First mounting portion 17. Second mounting portion

[0048] 151, first step surface 152, second step surface

[0049] 181, first avoidance slot 182, second avoidance slot

[0050] 191, first thickened portion 192, second thickened portion

[0051] 20. Solder pad 21. Solder piece portion. DETAILED DESCRIPTION

[0052] Please refer to Figures 1 to 11 As shown, it shows the specific structure of an embodiment of the utility model.

[0053] In the description of the present invention, it should be noted that directional words such as the terms "up", "down", "front", "back", "left", "right", etc., which indicate directions and positional relationships, are based on the directions or positional relationships shown in the drawings or during normal wearing and use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0054] A planar diaphragm speaker includes a bracket 10 and a solder pad 20.

[0055] The bracket 10 is provided with a sound-generating component; the sound-generating component includes a magnet 11, a diaphragm 12 and a voice coil 13, the voice coil 13 is connected to the diaphragm 12, and the voice coil 13 is electrically connected to the pad 20; wherein the height between one end of the voice coil and one end of the magnet 11 is 0.05mm-0.1mm; when the voice coil 13 is designed to be two, the two voice coils 13 are respectively connected to the upper and lower ends of the diaphragm 12, and according to the cost and effect requirements, a single-sided voice coil 13 or a double-sided voice coil 13 structure can be selected as needed. If a single-sided voice coil 13 is made, the distance between the diaphragm and the magnet 11 can be made smaller on the other side without the voice coil 13, which can further increase the BL value and improve the sensitivity of the tweeter. The dual voice coil 13 design increases the effective BL to twice that of the original single voice coil 13 without increasing the product height and additional magnetic circuit.

[0056] The diaphragm 12 is spaced apart from the magnet 11. Preferably, the diaphragm 12 includes a middle portion 121 and an outer ring portion 122, the outer ring portion 122 is arranged around the outer circumference of the middle portion 121, and a membrane ring 123 is arranged at one end of the outer ring portion 122; a middle sticker 124 is arranged at one end and / or the other end of the middle portion 121, and the voice coil 13 is bonded to the middle portion 121. Through the design of the middle sticker 124, the rigidity and symmetry of the central part of the diaphragm 12 are increased, laying a good foundation for bonding the voice coil 13 from top to bottom.

[0057] The bracket 10 is a metal bracket 10 or a plastic bracket 10. The bracket 10 has a receiving cavity 14 that passes through the upper and lower ends of the bracket 10, and a ring step 15 is arranged in the receiving cavity 14; the ring step 15 is protruded from the inner wall surface of the bracket 10 toward one side of the receiving cavity 14; the magnet 11 is mounted on the ring step 15; the ring step 15 is provided with a first avoidance notch 181 for the lead wire of the voice coil to extend out; preferably, the width of the ring step 15 is 0.1mm-0.3mm; the height of the ring step 15 is 0.1mm-0.3mm.

[0058] The outer side of the bracket 10 has a first mounting portion 16 which is recessed inwards. The first mounting portion 16 has a height direction and a length direction which are perpendicular to each other. The height direction of the first mounting portion 16 is parallel to the height direction of the bracket 10. The inner side of the first mounting portion 16 is connected to the accommodating cavity 14. The first mounting portion 16 is used for mounting the solder pad 20. The solder pad 20 is integrally molded with the first mounting portion 16. The voice coil is electrically connected to the solder pad.

[0059] and / or

[0060] The outer side of the bracket 10 has a second mounting portion 17 that is recessed inwards. The second mounting portion 17 has a height direction and a length direction that are perpendicular to each other. The height direction of the second mounting portion 17 is parallel to the height direction of the bracket 10. The second mounting portion 17 is used to facilitate the subsequent side-placed spot welding positioning of the speaker. Among them, the design of the second mounting portion 17 allows the bracket to be quickly positioned in the jig without affecting the maximum outer diameter of the bracket 10, and visual fast automated spot welding is achieved to improve work efficiency; and the speaker structure can be made ultra-thin, and the outer diameter size is also easy to be made small, and it can be flexibly combined with the bass unit speaker.

[0061] The bracket 10 is provided with a second avoidance slot 182 at the lower end corresponding to the first mounting portion 16 for the voice coil lead to extend out. The second avoidance slot 182 is connected to the accommodating cavity 14 so that the membrane ring 123 of the diaphragm 12 will not squeeze the lead of the voice coil 13 .

[0062] Preferably, a first thickened portion 191 is protruded from one end of the inner side of the first mounting portion 16 close to the bracket 10;

[0063] and / or

[0064] A second thickened portion 192 is protruded from the inner end of the second mounting portion 17 close to the bracket 10 ; wherein the first thickened portion 191 and the second thickened portion 192 are arranged opposite to each other; and at least parts of the first thickened portion 191 and the second thickened portion 192 are in contact with the inner side surface of the annular step 15 .

[0065] Preferably, the first thickened portion 191 and the second thickened portion 192 have avoidance surfaces on the side close to the diaphragm, wherein the first thickened portion 191 and the second thickened portion 192 become thinner on the side close to the diaphragm in the height direction to form an avoidance surface; thereby providing an assembly position for the diaphragm 12 and preventing the diaphragm from hitting the thickened portion and being damaged during sound-generating vibration, or preventing the diaphragm from having insufficient travel resulting in poor sound effects.

[0066] The pad 20 is used for current to flow in and out; the pad 20 is integrally molded at the first mounting portion 16; the wall thickness of the bracket can be as thick as 0.2 mm and copper rings can be saved. Without increasing the height, the welding method between the traditional PCB and the voice coil lead can effectively reduce the difficulty of welding the bass coil lead, improve work efficiency, and reduce welding noise and short circuit defects. In addition, the presence of the pad can save the need for welding external electronic wires, which can facilitate FPC connection welding.

[0067] The pad 20 includes a soldering piece 21 for connecting to the lead of the voice coil 13 and a conductive part for electrically connecting to an external component. When the lead of the voice coil 13 is pulled out and spot-welded on the soldering piece 21 of the pad 20, the soldering point is covered with UV glue, which is easy to operate, error-prone and efficient. In order to reduce weight and improve the high-frequency performance of the speaker, the lead of the voice coil 13 can be changed to an ultra-high tension copper-clad aluminum wire because its tweeter has a small amplitude.

[0068] Preferably, the annular step 15 includes a first step surface 151 and a second step surface 152 which are relatively arranged, and the magnet 11 includes a first magnet group 111 and a second magnet group 112, the first magnet group 111 and the membrane ring 123 are arranged on the first step surface 151; the second magnet group 112 is arranged on the second step surface 152 to form a first annular gap, so that the diaphragm 12 and the voice coil 13 are installed in the first annular gap.

[0069] The upper and lower ends of the bracket 10 are respectively provided with a first sound outlet or a second sound outlet; the first magnet group 111 includes a first inner magnet 1111 and a first outer magnet 1112, the first inner magnet 1111 has a first inner ring hole, the first outer magnet 1112 has a first outer ring hole, the first outer magnet 1112 is sleeved on the outside of the first inner magnet 1111 through the first outer ring hole, and the outer wall of the first inner magnet 1111 and the inner wall of the first outer magnet 1112 form a second annular gap; the The first inner ring hole is connected to the first sound outlet; the second magnet group 112 includes a second inner magnet 1121 and a second outer magnet 1122, the second inner magnet 1121 has a second inner ring hole, the second outer magnet 1122 has a second outer ring hole, the second outer magnet 1122 is sleeved on the outside of the second inner magnet 1121 through the second outer ring hole, and the outer wall of the second inner magnet 1121 and the inner wall of the second outer magnet 1122 form a third annular gap; the second inner ring hole is connected to the second sound outlet. It can select the first sound outlet or the second sound outlet for pronunciation according to actual needs. After selecting a sound outlet, the other side of the sound outlet can be sealed with glue or a gasket. Preferably, the second annular gap and the third annular gap are both 0.01mm-0.05mm.

[0070] Preferably, one end of the first inner magnet 1111 has opposite magnetic poles to the other end, one end of the first outer magnet 1112 has opposite magnetic poles to the other end, and the first inner magnet 1111 and the first outer magnet 1112 have opposite magnetic poles on the same side.

[0071] The magnetic poles of one end and the other end of the second inner magnet 1121 are opposite, the magnetic poles of one end and the other end of the second outer magnet 1122 are opposite, and the magnetic poles of the same side ends of the second inner magnet 1121 and the second outer magnet 1122 are opposite; the magnetic poles of the opposite ends of the first inner magnet 1111 and the first outer magnet 1112 and the second inner magnet 1121 and the second outer magnet 1122 are the same. The first inner magnet 1111 and the first outer magnet 1112 and the second inner magnet 1121 and the second outer magnet 1122 can also be changed to a single-sided magnetic circuit structure, which can reduce costs and simplify processes.

[0072] The design focus of the utility model is that it is mainly through the provision of an annular step in the accommodating cavity; the magnet is installed on the annular step, which plays a good fixing and supporting role, especially the speaker adopts a U-iron-free design, so that a separate U-iron is no longer needed to support the magnet, so that its overall structure is compact, small in size, few in parts, low in assembly difficulty, high in production efficiency, low in production cost and can greatly reduce the thickness of the speaker, effectively making the speaker thin; secondly, the magnet is located at the outermost side of the speaker, the magnetic field strength of the magnet is large, and the sensitivity of the speaker is high; and the annular step is provided with a first avoidance groove, so that the lead of the voice coil can be safely led out, avoiding the membrane ring of the diaphragm from squeezing the lead of the voice coil.

[0073] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A planar diaphragm speaker, comprising a bracket and a pad for current to flow in and out; a sound-generating component is arranged in the bracket; the sound-generating component comprises a magnet, a diaphragm and a voice coil, the voice coil is connected to the diaphragm, and the diaphragm is spaced apart from the magnet; characterized in that: The bracket has a receiving cavity that passes through the upper and lower ends of the bracket, and an annular step is arranged in the receiving cavity; the annular step is protruded from the inner wall surface of the bracket toward one side of the receiving cavity; the annular step is provided with a first avoidance groove for the lead wire of the voice coil to extend out; the magnet is installed on the annular step.

2. The planar diaphragm speaker according to claim 1, characterized in that: The width of the annular step is 0.1 mm-0.3 mm; the height of the annular step is 0.1 mm-0.3 mm.

3. The planar diaphragm speaker according to claim 1, characterized in that: The outer side of the bracket has a first mounting portion that is recessed inward, the first mounting portion has a height direction and a length direction that are perpendicular to each other, the height direction of the first mounting portion is parallel to the height direction of the bracket, and the inner side of the first mounting portion is connected to the accommodating cavity; the first mounting portion is used for mounting the pad; wherein the pad is integrally encapsulated and molded on the first mounting portion; the voice coil is electrically connected to the pad; and / or The outer side of the bracket has a second mounting portion recessed inwardly, the second mounting portion has a height direction and a length direction perpendicular to each other, the height direction of the second mounting portion is parallel to the height direction of the bracket, and the second mounting portion is used to facilitate subsequent side spot welding positioning of the speaker.

4. The planar diaphragm speaker according to claim 3, characterized in that: A first thickened portion is protrudingly provided at one end of the inner side of the first mounting portion close to the bracket; and / or A second thickened portion is protruded from one inner end of the second mounting portion close to the bracket; wherein the first thickened portion and the second thickened portion are arranged opposite to each other; and at least parts of the first thickened portion and the second thickened portion are in contact with the inner side surface of the annular step.

5. The planar diaphragm speaker according to claim 4, characterized in that: The first thickened portion and the second thickened portion both have avoidance surfaces on one side close to the diaphragm.

6. The planar diaphragm speaker according to claim 3, characterized in that: A second avoidance slot for the voice coil lead to extend out is also provided at the lower end of the bracket corresponding to the first mounting portion, and the second avoidance slot is communicated with the accommodating cavity.

7. The planar diaphragm speaker according to claim 1, characterized in that: The pad includes a soldering piece portion for connecting to a lead of the voice coil and a conductive portion for electrically connecting to an external element.

8. The planar diaphragm speaker according to claim 1, characterized in that: The diaphragm includes a middle part and an outer ring part. The outer ring part is arranged around the outer circumference of the middle part, and a membrane ring is arranged on one side of the outer ring part; a center sticker is arranged on one side and / or the other side of the middle part, and the voice coil is glued to the middle part.

9. The planar diaphragm speaker according to claim 8, characterized in that: The annular step includes a first step surface and a second step surface which are arranged opposite to each other; the magnet includes a first magnet group and a second magnet group, and the first magnet group and the membrane ring are arranged on the first step surface; The second magnet group is arranged on the second step surface to form a first annular gap, so that the diaphragm and the voice coil are installed in the first annular gap.

10. The planar diaphragm speaker according to claim 9, characterized in that: The bracket is provided with a sound outlet, the first magnet group includes a first inner magnet and a first outer magnet, the first inner magnet has a first inner ring hole, the first outer magnet has a first outer ring hole, the first outer magnet is sleeved on the outside of the first inner magnet through the first outer ring hole, and the outer wall of the first inner magnet and the inner wall of the first outer magnet form a second annular gap; the magnetic poles of one end of the first inner magnet close to the diaphragm and the other end away from the diaphragm are opposite, the magnetic poles of one end of the first outer magnet close to the diaphragm and the other end away from the diaphragm are opposite, and the magnetic poles of the same-side ends of the first inner magnet and the first outer magnet are opposite; The second magnet group includes a second inner magnet and a second outer magnet, the second inner magnet has a second inner ring hole, the second outer magnet has a second outer ring hole, the second outer magnet is sleeved on the second inner magnet through the second outer ring hole, and the outer wall of the second inner magnet and the inner wall of the second outer magnet form a third annular gap; the sound outlet is connected to the first inner ring hole or the second inner ring hole; The magnetic poles of one end of the second inner magnet close to the diaphragm and the other end away from the diaphragm are opposite, the magnetic poles of one end of the second outer magnet close to the diaphragm and the other end away from the diaphragm are opposite, and the magnetic poles of the same-side ends of the second inner magnet and the second outer magnet are opposite; The first inner magnet and the first outer magnet are arranged opposite to each other, and the opposite end magnetic poles of the second inner magnet and the second outer magnet are the same.

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