Miniature loudspeaker with dual voice coils

Abstract

The utility model discloses a miniature loudspeaker with double voice coils, which adds a planar voice coil between the diaphragm and the longitudinal voice coil, increases the overall electromagnetic force without substantially changing the size of the loudspeaker, cancels the upper magnetic guide plate of the main magnet to change the magnetic force distribution area and make more magnetic lines pass through the planar voice coil, so as to increase the overall electromagnetic force and improve the loudspeaker volume.

Description

Technical Field

[0001] This utility model relates to a miniature loudspeaker with dual voice coils, and more particularly to a designer who adds a planar voice coil between the diaphragm and the longitudinal voice coil. Background Technology

[0002] In conventional miniature loudspeaker structures, a single longitudinal voice coil is typically used, positioned within the magnetic gap of a magnetic loop structure. When current passes through this voice coil, it interacts electromagnetically with the magnetic field within the gap, thereby driving the voice coil and diaphragm to actuate and produce sound. However, to further increase the volume, more voice coils and more complex magnetic loop structures are usually employed, which leads to a larger loudspeaker size and hinders miniaturization and thinning of the loudspeaker. Utility Model Content

[0003] The purpose of this invention is to provide a miniature loudspeaker with dual voice coils, which has the effect of increasing the overall electromagnetic force by adding a planar voice coil, thereby improving the loudspeaker volume.

[0004] Another objective of this invention is to enable the newly added planar voice coil to simultaneously function as a spider.

[0005] To achieve the above-mentioned effects, the technical features of this utility model include: a magnetic return structure, a support, a planar voice coil, a longitudinal voice coil, and a diaphragm; the magnetic return structure has a magnetic conductor and a main magnet, the magnetic conductor has a base plate and a peripheral portion, the main magnet is disposed above the base plate, and a magnetic gap is formed between the peripheral portion and the main magnet; the support is attached to the peripheral portion of the magnetic return structure; the planar voice coil has a flat central portion, a positioning outer ring portion, and a number of elastic arms, each elastic arm being connected between the flat central portion and the positioning outer ring portion, the positioning outer ring portion being attached to the support, and the flat central portion having at least one planar winding portion above the magnetic gap; the longitudinal voice coil has a longitudinal winding portion, the longitudinal voice coil being attached to the lower edge of the flat central portion of the planar voice coil and located within the magnetic gap, the longitudinal winding portion being electrically connected to the planar winding portion; the central region of the diaphragm is attached to the flat central portion of the planar voice coil, and the outer periphery of the diaphragm is attached to the support.

[0006] Furthermore, the planar voice coil is primarily made of polyimide and covers the planar winding portion. The flat center portion of the planar voice coil is a hollowed-out annular flat center portion. The winding width of the planar winding portion is less than twice the width of the magnetic gap, and the longitudinal winding portion is electrically connected to the planar winding portion to form an inverted L-shaped longitudinal plus planar double winding portion. The outer periphery of the diaphragm is connected to the positioning outer ring portion of the planar voice coil and indirectly connected to the support. The outer periphery of the magnetic return structure is integrally formed from the outer periphery of the base plate portion upwards. The outer periphery of the magnetic return structure is composed of a pair of side magnets and a pair of side magnetic plates disposed above the base plate portion; the pair of side magnetic plates are integrally formed with the support. The height of the main magnet is not lower than the height of the outer periphery. Each elastic arm is a Z-shaped elastic arm with acute angles at two bends. Attached Figure Description

[0007] Figure 1 This is an exploded view of the structure of this utility model;

[0008] Figure 2 This is a structural assembly diagram of the present invention;

[0009] Figure 3 This is a cross-sectional view of the structure of this utility model;

[0010] Figure 4 This is a structural assembly diagram of the magnetic return structure of this utility model;

[0011] Figure 5 This is a perspective view of the planar voice coil of this utility model;

[0012] Figure 6 This is a structural illustration of the planar winding section of this utility model;

[0013] Figure 7 This diagram illustrates the electrical connection between the planar winding portion and the longitudinal winding portion of this utility model.

[0014] Explanation of markings in the diagram:

[0015] 10: Magnetic loop structure;

[0016] 11: Magnetic conductive components;

[0017] 12: Main magnet;

[0018] 13: Base plate;

[0019] 14: Peripheral area;

[0020] 141: Edge magnet;

[0021] 142: Side magnetic plate;

[0022] 143: Gap;

[0023] 15: Magnetic gap;

[0024] 20: Bracket;

[0025] 30: Planar voice coil;

[0026] 31: Flat center;

[0027] 32: Locate the outer ring section;

[0028] 33: Flexible arm;

[0029] 34: Planar winding section;

[0030] 341: Internal electrical connection pad;

[0031] 342: External electrical connection pad;

[0032] 343: Wire;

[0033] 40: Vertical voice coil;

[0034] 41: Longitudinal winding section;

[0035] 50: Diaphragm. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0038] The following is a reference to the appendix. Figure 1 To be continued Figure 7 The present invention comprises: a magnetic return structure 10, a support 20, a planar voice coil 30, a longitudinal voice coil 40, and a diaphragm 50.

[0039] The magnetic return structure 10 has a magnetic conductor 11 and a main magnet 12. The magnetic conductor 11 has a base plate portion 13 and a peripheral portion 14. The main magnet 12 is disposed above the base plate portion 13. A magnetic gap 15 is formed between the peripheral portion 14 and the main magnet 12. The height of the main magnet 12 is not lower than the height of the peripheral portion 14. Please refer to [further details omitted]. Figure 4 As shown, the peripheral portion 14 is composed of a pair of side magnets 141 and a pair of side magnetic plates 142 disposed above the base plate portion 13. The pair of side magnetic plates 142 can be integrally formed with the bracket 20, and the side edges of the pair of side magnetic plates 142 have several notches 143 so as to be integrally formed with the bracket 20 securely; or, the peripheral portion 14 can be integrally formed from the outer periphery of the base plate portion 13 upwards (not shown).

[0040] The bracket 20 is attached to the outer periphery 14 of the magnetic return structure 10.

[0041] The planar voice coil 30 has a flat central portion 31, a positioning outer ring portion 32, and several elastic arms 33. Each elastic arm 33 is connected between the flat central portion 31 and the positioning outer ring portion 32. Each elastic arm 33 can be a Z-shaped elastic arm with acute angles at two bends. The positioning outer ring portion 32 is coupled to the bracket 20. The flat central portion 31 has at least one planar winding portion 34 above the magnetic gap 15 (please refer to further details). Figure 5 As shown), the winding width of the planar winding portion 34 is less than twice the width of the magnetic gap 15; wherein, the planar voice coil 30 is mainly composed of polyimide and covers the planar winding portion 34, and the flat center portion 31 can be an annular flat center portion 31 with the center hollowed out.

[0042] The longitudinal voice coil 40 has a longitudinal winding portion 41. The longitudinal voice coil 40 is coupled to the lower edge of the flat center portion 31 of the planar voice coil 30 and is located within the magnetic gap 15. The longitudinal winding portion 41 is electrically connected to the planar winding portion 34 to form an inverted L-shaped longitudinal plus planar double winding portion (e.g., Figure 3 (As shown); Next, please refer to... Figure 6 , Figure 7 As shown, the planar winding portion 34 has a pair of inner electrical connection pads 341 and a pair of outer electrical connection pads 342. The pair of inner electrical connection pads 341 electrically connect the longitudinal winding portion 41 and the planar winding portion 34. The outer electrical connection pads 342 are used for electrical connection to the outside of the speaker. The pair of inner electrical connection pads 341 and the outer electrical connection pads 342 can be electrically connected through two parallel wires 343, and the two parallel wires 343 are arranged along two adjacent elastic arms 33.

[0043] The central region of the diaphragm 50 is coupled to the upper edge of the flat central portion 31 of the planar voice coil 30, and the outer periphery of the diaphragm 50 is coupled to the positioning outer ring portion 32 of the planar voice coil 30 and indirectly coupled to the support 20 (e.g., Figure 3 As shown in the figure, the outer periphery of the diaphragm 50 may also be directly attached to the bracket 20 (not shown) without being attached to the positioning outer ring 32.

[0044] Based on this configuration, this invention adds a planar voice coil 30 between the diaphragm 50 and the longitudinal voice coil 40. This allows for electrical connection between the longitudinal voice coil 40 and the planar voice coil 30 without substantially changing the speaker size, thereby increasing the overall electromagnetic force. Furthermore, to maximize the magnetic flux through both voice coils, the upper magnetic plate of the main magnet 12 is removed, altering the magnetic force distribution area (allowing more magnetic lines of force to pass through the planar voice coil 30). Therefore, this invention effectively increases the overall electromagnetic force by adding the planar voice coil 30, thereby enhancing the speaker volume.

[0045] Furthermore, the newly added planar voice coil 30 adopts a spider structure design, utilizing the elastic arm 33 to generate elasticity, and using the Z-shaped shape of the elastic arm 33 to provide damping, thereby stabilizing the axial movement of the longitudinal voice coil 40 and reducing polarization distortion when the speaker is operating; and further, making the two bends of the elastic arm 33 acute angles, maximizing the length of the elastic arm 33, making the vibration stroke of the elastic arm 33 longer, which is more effective in improving low-frequency sound quality and suppressing low-frequency polarization; therefore, this utility model also has the function of simultaneously providing damping as a spider and reducing polarization distortion.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A miniature loudspeaker with dual voice coils, characterized in that, It includes: a magnetic return structure, a support, a planar voice coil, a longitudinal voice coil, and a diaphragm; The magnetic return structure has a magnetic conductor and a main magnet. The magnetic conductor has a base plate and a peripheral portion. The main magnet is disposed above the base plate, and a magnetic gap is formed between the peripheral portion and the main magnet. The bracket is attached to the outer periphery of the magnetic return structure; The planar voice coil has a flat central portion, a positioning outer ring portion, and a number of elastic arms, each of the elastic arms being connected between the flat central portion and the positioning outer ring portion. The positioning outer ring portion is coupled to the support, and the flat central portion has at least one planar winding portion above the magnetic gap. The longitudinal voice coil has a longitudinal winding portion, which is coupled to the flat center portion of the planar voice coil and located within the magnetic gap; the longitudinal winding portion is electrically connected to the planar winding portion. The central region of the diaphragm is attached to the flat center of the planar voice coil, and the outer periphery of the diaphragm is attached to the support.

2. The micro speaker with dual voice coils of claim 1, wherein, The planar voice coil is made of polyimide and covers the planar winding portion.

3. The micro speaker with dual voice coils of claim 1, wherein, The flat center of the planar voice coil is a hollowed-out annular flat center.

4. The micro speaker with dual voice coils of claim 1, wherein, The winding width of the planar winding portion is less than twice the width of the magnetic gap, and the longitudinal winding portion is electrically connected to the planar winding portion to form an inverted L-shaped longitudinal plus planar double winding portion.

5. The micro speaker with dual voice coils of claim 1, wherein, The outer periphery of the diaphragm is connected to the positioning outer ring of the planar voice coil and indirectly connected to the support.

6. The micro speaker with dual voice coils of claim 1, wherein, The outer periphery of the magnetic return structure is integrally formed upward from the outer periphery of the base plate.

7. The micro speaker with dual voice coils of claim 1, wherein, The outer portion of the magnetic return structure is composed of a pair of side magnets and a pair of side magnetic plates disposed above the base plate.

8. The micro speaker with dual voice coils of claim 7, wherein, The magnetic conductive plates on both sides are integrally formed with the bracket.

9. The micro speaker with dual voice coils of claim 1, wherein, The height of the main magnet is not lower than the height of the outer perimeter.

10. The miniature loudspeaker with dual voice coils according to claim 1, wherein, Each of these elastic arms is a Z-shaped elastic arm with acute angles at both bends.

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