Miniature loudspeaker and assembling jig

Abstract

The utility model discloses a miniature loudspeaker and an assembling jig, the miniature loudspeaker comprises a support, a voice coil and a diaphragm, the support is a support with two open ends, the support comprises a first ring wall and a second ring wall, and the first ring wall and the second ring wall form an accommodating cavity; a magnetic circuit assembly is further installed in the containing cavity and comprises an inner ring magnetic circuit, an outer ring magnetic circuit and a magnetic conductive plate. The inner side wall of the accommodating cavity is also provided with a limiting step; according to the loudspeaker, the total height size of the loudspeaker can be reduced, and the outer ring magnetic circuit is limited by utilizing the limiting step on the bracket, so that the risk that the outer ring magnetic circuit falls off due to long-term violent vibration or strong impact force is prevented.

Description

Technical Field

[0001] The utility model relates to the technology of the speaker field, in particular to a miniature speaker and an assembly fixture. Background Art

[0002] As we all know, a speaker is a sound-generating device that converts electrical signals into audio signals. Its sound-generating principle is that a magnet generates a permanent magnetic field. When the coil is energized, an alternating current signal is input into the coil. According to the left-hand rule, the energized coil moves in the permanent magnetic field due to the magnetic field force, and the coil drives the sound membrane to vibrate, causing the density of the air to change and produce sound.

[0003] like Figures 11 to 13 As shown, it shows the structure of a magnetic circuit speaker in the prior art and a processing jig for assembling and forming the magnetic circuit. The magnetic circuit speaker structure includes an outer shell 50 and a magnetic circuit. A positioning column 51 located in a receiving cavity is protruded upward from the bottom of the outer shell 50, and the positioning column 51 has a hollow passage that passes through the bottom of the outer shell. The outer shell 50 includes a bottom 52 and an outer ring wall 53, and the bottom 52 and the outer ring wall 53 form a receiving cavity. The magnetic circuit includes an inner magnetic circuit 54 and an outer magnetic circuit 55. The magnetic circuit is installed in the receiving cavity of the outer shell 50. The inner magnetic circuit 54 The upper inner magnetic ring, the middle inner magnetic ring and the lower inner magnetic ring are stacked in sequence, and the outer magnetic circuit 55 is stacked in sequence by the upper outer magnetic ring, the middle outer magnetic ring and the lower outer magnetic ring; wherein, the inner magnetic circuit 54 and the outer magnetic circuit 55 are respectively combined by two different processing jigs 60, and after the inner magnetic circuit 54 and the outer magnetic circuit 55 are processed and formed, the assembly process is to firstly sleeve the inner magnetic circuit 54 on the positioning column through the inner ring hole, and the outer magnetic circuit 55 is sleeved outside the inner magnetic circuit 54 through the outer ring hole; such a magnetic circuit speaker has the following defects in the processing and assembly process of the inner and outer magnetic circuits:

[0004] Affected by the structure of the outer shell, in actual use, the outer magnetic ring or the inner magnetic ring is prone to fall off under long-term severe vibration or strong impact. Secondly, the inner magnetic circuit and the outer magnetic circuit are processed separately by two different processing jigs. Since each jig has its processing concentricity accuracy, the magnetic circuits assembled by the two jigs have two concentricities and tolerances. Secondly, the concentricity tolerance of the positioning column will also be generated during the injection molding of the outer shell, and when the inner magnetic circuit is mounted on the positioning column of the outer shell, the outer wall of the positioning column and the inner magnetic circuit will also have a concentricity tolerance ( The outer wall size tolerance of the positioning column and the combined tolerance of the inner hole wall of the external magnetic circuit); then there is the concentricity tolerance of the inner wall of the positioning column and the external magnetic circuit (the combined tolerance of the inner wall size tolerance of the outer shell and the outer wall of the external magnetic circuit); as a result, the magnetic circuit speaker structure has 5 assembly concentricity tolerances. The more tolerances there are, the more difficult it is to control the cumulative tolerances. The larger the cumulative concentricity tolerances are, the easier it is for the magnetic circuit and the voice coil to collide when they move up and down (especially when the speaker is working at high power, the voice coil and the diaphragm are prone to slight swing when they move up and down, and the vertical up and down movement of the voice coil cannot reach 100% vertical, which affects the speaker performance;

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0006] In view of this, the present invention aims to solve the deficiencies in the prior art, and its main purpose is to provide a miniature speaker and an assembly fixture that can prevent the risk of its outer ring magnetic circuit falling off, ensure the combined concentricity of the inner ring, outer ring magnetic circuit and magnetic conductive plate, and thus reduce the assembly concentricity tolerance.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A miniature speaker comprises a bracket, a voice coil and a diaphragm, wherein the bracket is an open-ended bracket, the bracket comprises a first ring wall and a second ring wall, the first ring wall and the second ring wall constitute an accommodating cavity; the voice coil and the diaphragm are installed in the accommodating cavity;

[0009] A magnetic circuit assembly is also installed in the accommodating cavity, and the magnetic circuit assembly includes an inner ring magnetic circuit, an outer ring magnetic circuit and a magnetic conductive plate; the inner ring magnetic circuit has an inner ring hole, and the outer ring magnetic circuit has an outer ring hole, the outer ring magnetic circuit is sleeved on the outside of the inner ring magnetic circuit through the outer ring hole, and the outer wall of the inner ring magnetic circuit and the inner wall of the outer ring magnetic circuit form an annular gap, and the voice coil is at least partially located in the annular gap, wherein the inner side wall of the accommodating cavity also has a limiting step for preventing the outer ring magnetic circuit from loosening; the outer ring magnetic circuit is sleeved on the outside of the inner ring magnetic circuit, and one end of the outer ring magnetic circuit close to the diaphragm is limited by the limiting step, and the other ends of the outer ring magnetic circuit and the inner ring magnetic circuit away from the diaphragm are located on the magnetic conductive plate, and the magnetic conductive plate is installed on the bottom end surface of the first ring wall.

[0010] As a preferred solution, a through groove for the voice coil lead to extend out is arranged on the outside of the second ring wall, and the through groove is connected to the accommodating cavity.

[0011] As a preferred solution, the bracket further comprises a soldering pad, which is located beside the through slot and is integrally injection-molded on the bracket.

[0012] As a preferred solution, the magnetic conductive plate has a tuning hole and a sink for installing a tuning net, the sink is connected to the tuning hole and arranged corresponding to the bottom end surface of the tuning hole; the tuning net is attached to the sink.

[0013] As a preferred solution, the magnetic conductive plate further has an annular groove, and the annular groove is connected to the annular gap.

[0014] As a preferred embodiment, the inner ring magnetic circuit is formed by stacking an upper inner magnetic ring, a middle inner magnetic ring and a lower inner magnetic ring in sequence, and the outer ring magnetic circuit is formed by stacking an upper outer magnetic ring, a middle outer magnetic ring and a lower outer magnetic ring in sequence.

[0015] As a preferred solution, the bottom end surface of the first ring wall is provided with a mounting groove concave from the outside to the inside; the outside of the magnetic conductive plate is provided with a docking portion for matching with the mounting groove, and the magnetic conductive plate is installed on the bottom end surface of the first ring wall through the cooperation between the docking portion and the mounting groove.

[0016] An assembly jig is used to assemble the above-mentioned miniature speaker, which includes a tooling seat; the tooling seat has a first annular positioning groove for positioning the inner ring magnetic circuit and a second annular positioning groove for positioning the magnetic conductive plate or the outer ring magnetic circuit; the first annular positioning groove is connected to the second annular positioning groove and the first annular positioning groove is located below the second annular positioning groove; wherein the inner diameter of the first annular positioning groove is smaller than the inner diameter of the second annular positioning groove.

[0017] As a preferred solution, the outside of the tooling seat is concavely provided with a connecting groove for the ejection assembly to extend into at positions corresponding to the first annular positioning groove and the second annular positioning groove, and the connecting groove passes through the first annular positioning groove and the second annular positioning groove respectively.

[0018] As a preferred solution, the assembly jig further includes a mother seat, on which a plurality of tooling seats arranged at intervals are provided.

[0019] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that the overall height of the speaker can be reduced mainly through the bracket design, and the outer ring magnetic circuit is limited by the limiting step on the bracket to prevent the outer ring magnetic circuit from falling off due to long-term severe vibration or strong impact.

[0020] Secondly, through the design of the magnetic conductive plate, through the cooperation of the magnetic conductive plate and the open brackets at both ends, one end of the magnetic conductive plate is used to replace the plastic at the bottom of the bracket. On the one hand, the magnetic conductivity of the magnetic circuit is increased, and the BL value is increased by 5-10% to improve the frequency response characteristics, thereby improving the sensitivity of the speaker; on the other hand, the thickness of the speaker is reduced;

[0021] And through the structural design of the assembly fixture, the same fixture is used to complete the combined processing of all parts of the magnetic circuit assembly, so as to better ensure the combined concentricity of the inner ring, outer ring magnetic circuit and magnetic conductive plate, so as to avoid the problem of cumulative concentricity tolerance caused by the combination of multiple fixtures.

[0022] 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

[0023] Figure 1 It is a three-dimensional diagram of an embodiment of the utility model;

[0024] Figure 2 It is an exploded view of an embodiment of the utility model;

[0025] Figure 3 It is another exploded view of an embodiment of the utility model;

[0026] Figure 4 It is a cross-sectional view of an embodiment of the utility model;

[0027] Figure 5 It is a structural diagram of the bracket of the embodiment of the utility model;

[0028] Figure 6 It is a structural diagram of an assembly jig according to an embodiment of the utility model;

[0029] Figure 7 It is a cross-sectional view of an assembly jig according to an embodiment of the utility model;

[0030] Figure 8 It is another cross-sectional view of the assembly jig of the embodiment of the utility model (inner ring magnetic circuit assembly processing);

[0031] Fig. 9 This is another cross-sectional view of the assembly jig of the embodiment of the utility model (outer ring magnetic circuit assembly processing);

[0032] Fig.10 This is an assembly diagram of an assembly jig according to an embodiment of the utility model;

[0033] Fig.11 It is a cross-sectional view of the magnetic circuit speaker structure in the conventional technology;

[0034] Fig.12It is a cross-sectional view of the internal magnetic circuit of the magnetic circuit speaker structure in the conventional technology, which is assembled by a processing jig;

[0035] Fig.13 It is a cross-sectional view of a magnetic circuit speaker structure in conventional technology that uses another processing jig to assemble the outer magnetic circuit.

[0036] Description of the accompanying drawings:

[0037] 10. Bracket 11. First ring wall

[0038] 12. Second annular wall 13. Accommodating cavity

[0039] 111, installation groove 131, limiting step

[0040] 121. annular mounting portion 122. through groove

[0041] 14. Solder pad 15. Magnetic circuit assembly

[0042] 16. Inner magnetic circuit 17. Outer magnetic circuit

[0043] 161, annular gap 162, upper inner magnetic ring

[0044] 163, middle inner magnetic ring 164, lower inner magnetic ring

[0045] 171, upper outer magnetic ring 172, middle outer magnetic ring

[0046] 173. Lower outer magnetic ring

[0047] 18. Magnetic plate 181. Docking part

[0048] 182, tuning hole 183, annular groove

[0049] 184, tuning net 185, sink

[0050] 20. Voice coil

[0051] 30, diaphragm 40, tooling seat

[0052] 41. First annular positioning groove 42. Second annular positioning groove

[0053] 43. Connection slot

[0054] 50. Outer shell 51. Positioning column

[0055] 52. Bottom 53. Outer ring wall

[0056] 54, inner magnetic circuit 55, outer magnetic circuit

[0057] 60. Processing jig. DETAILED DESCRIPTION

[0058] 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 accompanying drawings. 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.

[0059] Please refer to Figures 1 to 13 As shown, it shows the specific structure of an embodiment of the utility model.

[0060] A miniature speaker comprises a bracket 10, a voice coil 20 and a diaphragm 30.

[0061] The bracket 10 is an open-ended bracket 10, and includes a first annular wall 11 and a second annular wall 12, wherein the first annular wall 11 and the second annular wall 12 form a receiving cavity 13; a mounting groove 111 is concavely formed on the bottom end surface of the first annular wall 11 from outside to inside;

[0062] Preferably, the upper end of the second annular wall 12 has an annular mounting portion 121 for mounting the outer ring portion of the diaphragm 30, and the diaphragm 30 is fixed to the annular mounting portion 121 through the outer ring portion. Preferably, the outer portion of the second annular wall 12 is provided with a through groove 122 for the lead wire of the voice coil 20 to extend, and the through groove 122 is connected to the accommodating cavity 13. The through groove 122 is designed to facilitate the lead wire of the voice coil 20 to extend and connect with the pad 14, so as to prevent the lead wire of the voice coil 20 from being crushed.

[0063] Preferably, the bracket 10 also has a solder pad 14, which is located beside the through slot 122. The solder pad 14 is integrally injection molded on the bracket 10. The presence of the solder pad 14 can save the need for welding external electronic wires, which can facilitate FPC connection welding.

[0064] A magnetic circuit assembly 15 is also installed in the accommodating cavity 13, and the magnetic circuit assembly 15 includes an inner ring magnetic circuit 16, an outer ring magnetic circuit 17 and a magnetic conductive plate 18; wherein the inner side wall of the accommodating cavity 13 also has a limiting step 131 for preventing the outer ring magnetic circuit 17 from loosening; the outer ring magnetic circuit 17 is sleeved outside the inner ring magnetic circuit 16, and one end of the outer ring magnetic circuit 17 close to the diaphragm 30 is limited by the limiting step 131, and the other ends of the outer ring magnetic circuit 17 and the inner ring magnetic circuit 16 away from the diaphragm 30 are located on the magnetic conductive plate 18;

[0065] The inner magnetic circuit 16 has an inner ring hole, and the outer magnetic circuit 17 has an outer ring hole. The outer magnetic circuit 17 is sleeved outside the inner magnetic circuit 16 through the outer ring hole, and the outer wall of the inner magnetic circuit 16 and the inner wall of the outer magnetic circuit 17 form an annular gap 161.

[0066] The outer portion of the magnetic conductive plate 18 is provided with a docking portion 181 for matching with the mounting groove 111. The magnetic conductive plate 18 is mounted on the bottom end surface of the first ring wall 11 through the matching of the docking portion 181 and the mounting groove 111. Through the matching of the magnetic conductive plate and the bracket with openings at both ends, the magnetic conductive plate is used at one end to replace the plastic at the bottom of the bracket, which increases the magnetic conductivity of the magnetic circuit and improves the BL value by 5-10% on the one hand, and reduces the thickness of the speaker on the other hand.

[0067] The magnetic plate 18 has a tuning hole 182 and a sink 185 for installing a tuning net. The sink 185 is connected to the tuning hole 182 and arranged corresponding to the bottom end surface of the tuning hole 182. A tuning net 184 is attached to the sink 185. The design of the sink can prevent the tuning net 184 from being displaced when it is hit or rubbed by foreign objects, thereby affecting the tuning effect. Secondly, the tuning net 184 is placed in the sink 185, which no longer occupies too much height space, which is conducive to reducing the overall thickness of the speaker.

[0068] Preferably, the magnetic conductive plate 18 also has an annular groove 183, and the magnetic conductive plate 18 is installed on the bottom end surface of the first ring wall, so that: the annular groove 183 is connected to the annular gap 161 to increase the up and down movement stroke of the voice coil. When high power is applied to the speaker, it is not easy to interfere with the magnetic conductive plate. In addition, the volume of the speaker cavity is increased to enhance the high-frequency effect.

[0069] The inner magnetic circuit 16 has one, two, three or more layers of inner magnetic rings; preferably, three layers of inner magnetic rings, wherein the three layers of inner magnetic rings are respectively an upper inner magnetic ring 162, a middle inner magnetic ring 163 and a lower inner magnetic ring 164, and the upper inner magnetic ring 162, the middle inner magnetic ring 163 and the lower inner magnetic ring 164 are sequentially overlapped to form the inner magnetic circuit 16;

[0070] Correspondingly, the outer ring magnetic circuit has one, two, three or more layers of outer magnetic rings; preferably, three layers of outer magnetic rings, wherein the three layers of outer magnetic rings are respectively an upper outer magnetic ring 171, a middle outer magnetic ring 172 and a lower outer magnetic ring 173, and the upper outer magnetic ring 171, the middle outer magnetic ring 172 and the lower outer magnetic ring 173 are overlapped in sequence to form the outer ring magnetic circuit 17.

[0071] The voice coil 20 and the diaphragm 30 are installed in the accommodating cavity 13; the voice coil 20 is installed in the annular gap 161, the voice coil 20 includes a hollow tube and a roll located outside the hollow tube, the roll is located in the annular gap 161, the diaphragm 30 is installed above the voice coil 20 and combined with the top of the hollow tube, the diaphragm 30 includes a ball top, a connecting part, a folded ring, and an outer ring part connected in sequence from the inside to the outside, and the voice coil 20 is connected to the connecting part.

[0072] An assembly jig is used to assemble the above-mentioned miniature speaker, which includes a tooling seat 40; the tooling seat 40 has a first annular positioning groove 41 for positioning the inner ring magnetic circuit 16 and a second annular positioning groove 42 for positioning the magnetic conductive plate 18 or the outer ring magnetic circuit 17; the first annular positioning groove 41 is connected to the second annular positioning groove 42 and the first annular positioning groove 41 is located below the second annular positioning groove 42; wherein the inner diameter of the first annular positioning groove 41 is smaller than the inner diameter of the second annular positioning groove 42.

[0073] Preferably, a connecting groove 43 for the ejection assembly to extend into is formed on the outside of the tooling seat 40 corresponding to the first annular positioning groove 41 and the second annular positioning groove 42 , and the connecting groove 43 passes through the first annular positioning groove 41 and the second annular positioning groove 42 , respectively.

[0074] The assembly jig further includes a mother seat (not shown), on which a plurality of tooling seats 40 arranged at intervals are provided to increase the production efficiency of the production line.

[0075] The design focus of the utility model is that it can reduce the overall height of the speaker mainly through the bracket design, and use the limiting step on the bracket to limit the outer ring magnetic circuit to prevent the outer ring magnetic circuit from falling off due to long-term severe vibration or strong impact;

[0076] Secondly, through the design of the magnetic conductive plate, through the cooperation of the magnetic conductive plate and the open brackets at both ends, one end of the magnetic conductive plate is used to replace the plastic at the bottom of the bracket. On the one hand, the magnetic conductivity of the magnetic circuit is increased, and the BL value is increased by 5-10% to improve the frequency response characteristics, thereby improving the sensitivity of the speaker; on the other hand, the thickness of the speaker is reduced;

[0077] And through the structural design of the assembly fixture, the same fixture is used to complete the combined processing of all parts of the magnetic circuit assembly, so as to better ensure the combined concentricity of the inner ring, outer ring magnetic circuit and magnetic conductive plate, so as to avoid the problem of cumulative concentricity tolerance caused by the combination of multiple fixtures.

[0078] 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 slight 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 miniature speaker, comprising a bracket, a voice coil and a diaphragm, characterized in that: The bracket is an open-ended bracket, and comprises a first ring wall and a second ring wall, wherein the first ring wall and the second ring wall form a receiving cavity; the voice coil and the diaphragm are installed in the receiving cavity; A magnetic circuit assembly is also installed in the accommodating cavity, and the magnetic circuit assembly includes an inner ring magnetic circuit, an outer ring magnetic circuit and a magnetic conductive plate; the inner ring magnetic circuit has an inner ring hole, and the outer ring magnetic circuit has an outer ring hole, the outer ring magnetic circuit is sleeved on the outside of the inner ring magnetic circuit through the outer ring hole, and the outer wall of the inner ring magnetic circuit and the inner wall of the outer ring magnetic circuit form an annular gap, and the voice coil is at least partially located in the annular gap, wherein the inner side wall of the accommodating cavity also has a limiting step for preventing the outer ring magnetic circuit from loosening; the outer ring magnetic circuit is sleeved on the outside of the inner ring magnetic circuit, and one end of the outer ring magnetic circuit close to the diaphragm is limited by the limiting step, and the other ends of the outer ring magnetic circuit and the inner ring magnetic circuit away from the diaphragm are located on the magnetic conductive plate, and the magnetic conductive plate is installed on the bottom end surface of the first ring wall.

2. The miniature speaker according to claim 1, characterized in that: A through slot for the voice coil lead to extend out is arranged on the outside of the second ring wall, and the through slot is communicated with the accommodating cavity.

3. The miniature speaker according to claim 2, characterized in that: The bracket is also provided with a welding pad, which is located beside the through slot and is integrally injection-molded on the bracket.

4. The miniature speaker according to claim 1, characterized in that: The magnetic conductive plate is provided with a tuning hole and a sink for installing a tuning net, the sink is connected to the tuning hole and arranged corresponding to the bottom end surface of the tuning hole; the tuning net is attached to the sink.

5. The miniature speaker according to claim 1, characterized in that: The magnetic conductive plate also has an annular groove, and the annular groove is connected to the annular gap.

6. The miniature speaker according to claim 1, characterized in that: The inner ring magnetic circuit is formed by stacking an upper inner magnetic ring, a middle inner magnetic ring and a lower inner magnetic ring in sequence, and the outer ring magnetic circuit is formed by stacking an upper outer magnetic ring, a middle outer magnetic ring and a lower outer magnetic ring in sequence.

7. The miniature speaker according to claim 1, characterized in that: The bottom end surface of the first ring wall is concavely provided with a mounting groove from the outside to the inside; the outside of the magnetic conductive plate is convexly provided with a docking portion for matching with the mounting groove, and the magnetic conductive plate is installed on the bottom end surface of the first ring wall through the cooperation between the docking portion and the mounting groove.

8. An assembly jig, characterized in that: It is used to assemble the miniature loudspeaker described in any one of claims 1 to 7, and includes a tooling seat; the tooling seat has a first annular positioning groove for positioning the inner ring magnetic circuit and a second annular positioning groove for positioning the magnetic conductive plate or the outer ring magnetic circuit; the first annular positioning groove is connected to the second annular positioning groove and the first annular positioning groove is located below the second annular positioning groove; wherein the inner diameter of the first annular positioning groove is smaller than the inner diameter of the second annular positioning groove.

9. The assembly jig according to claim 8, characterized in that: The outside of the tooling seat is concavely provided with a connecting groove for the ejection assembly to extend into at positions corresponding to the first annular positioning groove and the second annular positioning groove, and the connecting groove passes through the first annular positioning groove and the second annular positioning groove respectively.

10. The assembly jig according to claim 8, characterized in that: The assembly jig also includes a female seat, on which a plurality of tooling seats arranged at intervals are arranged.

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