Low frequency amplitude enhanced and welded plate integrated annular coil planar diaphragm

Abstract

The utility model relates to the technical field of electroacoustics, concretely is a kind of low-frequency amplitude enhancement and welding plate conjoined annular coil plane diaphragm, including one annular diaphragm frame, and diaphragm frame is set in the diaphragm unit, diaphragm unit is equipped with plane coil unit;Diaphragm unit includes first diaphragm and the combined second diaphragm concentric with first diaphragm, the outer diameter of second diaphragm is wider than first diaphragm, and the rigidity of first diaphragm is greater than second diaphragm;The outer edge of diaphragm frame is equipped with the flexible circuit board electrically connected with two plane coil arrays, and the end of flexible circuit board away from diaphragm frame is equipped with a pair of connecting pad.The amplitude of second diaphragm in the utility model will be significantly greater than first diaphragm, to significantly improve the low-frequency performance of diaphragm, still through flexible circuit board, connecting pad is extended to the outside of diaphragm frame, it is convenient to connect audio signal line, also can utilize earphone internal space, more convenient assembly.

Description

Technical Field

[0001] This utility model relates to the field of electroacoustic technology, specifically a low-frequency amplitude enhancement and welded plate integrated ring coil planar diaphragm. Background Technology

[0002] Planar diaphragms are acoustic transducers that differentiate themselves from traditional dynamic and balanced armature drivers. Their core feature lies in the use of an ultra-thin planar diaphragm structure, where coils are directly formed on the diaphragm surface, similar to the conductive layer of a printed circuit board. Annular or push-pull magnet arrays are often arranged on both sides of the planar diaphragm to form a uniform vertical magnetic field. When alternating current passes through the coil, the coil experiences a Lorentz force in the magnetic field, driving the diaphragm to produce planar piston-like vibrations.

[0003] Because planar magnetic diaphragms form coils directly on their surface, similar to the conductive layer of a printed circuit board, this physical characteristic causes the diaphragm's vibration waves to spread in a planar manner, resulting in weaker low-frequency performance compared to traditional dynamic drivers. Furthermore, due to the larger diaphragm area and the limited magnetic circuit distribution, it is difficult for the diaphragm to generate sufficient reverse modes during vibration, leading to insufficient low-frequency depth and power. On the other hand, reducing the diaphragm area to address these issues would reduce the diaphragm's sound-producing area.

[0004] On the other hand, in existing technologies, the terminals connecting the coils in a planar magnetic diaphragm to the audio signal cable of the headphones are usually integrated into the diaphragm's support. In the application of planar magnetic diaphragms to headphones, due to the small size and limited space of the headphones, the terminals connecting the coils in the planar magnetic diaphragm to the audio signal cable are also miniaturized, increasing the difficulty of installing the audio signal cable.

[0005] Therefore, there is an urgent need for a planar diaphragm solution that can significantly improve the low-frequency performance of the diaphragm without reducing the diaphragm's sound-emitting area and also reduce the difficulty of installing audio signal cables. Utility Model Content

[0006] In response to the aforementioned needs of the prior art, this utility model provides a low-frequency amplitude enhancement and welded plate integrated ring coil planar diaphragm, the technical solution of which is as follows.

[0007] A low-frequency amplitude enhancement and welded plate integrated ring coil planar diaphragm includes a ring diaphragm frame and a diaphragm unit stretched in the diaphragm frame, with a planar coil unit disposed on the diaphragm unit;

[0008] The diaphragm unit includes a first diaphragm and a second diaphragm concentrically connected to the first diaphragm. The outer diameter of the second diaphragm is wider than that of the first diaphragm. The diaphragm unit is connected to the diaphragm frame through the periphery of the second diaphragm, and the rigidity of the first diaphragm is greater than that of the second diaphragm.

[0009] The planar coil unit is located within the range of the first diaphragm;

[0010] The planar coil unit includes two planar coil arrays symmetrically disposed on the front and back sides of the diaphragm unit, and the two planar coil arrays form a series circuit.

[0011] The coil array comprises multiple concentrically distributed planar spiral coils connected in series, and the spiral directions of two adjacent sets of planar spiral coils are set to be opposite.

[0012] The outer edge of the diaphragm frame is provided with a flexible circuit board electrically connected to two planar coil arrays. The end of the flexible circuit board away from the diaphragm frame is provided with a pair of wiring pads. The wiring pads form circuit endpoints in the series circuit formed by the two planar coil arrays on the front and back sides of the diaphragm unit.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The rigidity of the first diaphragm is greater than that of the second diaphragm. Therefore, when a low-frequency signal is input to the planar coil unit, the first diaphragm located in the central region of the diaphragm unit still has a better transient response, while the amplitude of the second diaphragm located in the edge region of the diaphragm unit will be significantly greater than that of the first diaphragm, thereby significantly improving the low-frequency performance of the diaphragm.

[0015] (2) By extending the wiring pads to the outside of the diaphragm frame through the flexible circuit board, it is easier to connect audio signal lines and utilize the internal space of the headphones, making assembly easier.

[0016] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 .

[0019] Figure 3 This is an exploded view of the structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the planar coil array in this utility model.

[0021] As shown in the figure:

[0022] Diaphragm frame 1, diaphragm unit 2, planar coil unit 3, first diaphragm 21, second diaphragm 22, planar coil array 31, planar spiral coil 32, flexible circuit board 4, wiring pad 5. Detailed Implementation

[0023] Please see Figures 1 to 4 In one embodiment, the present invention provides a low-frequency amplitude enhancement and a welded plate integrated ring coil planar diaphragm, comprising a ring diaphragm frame 1 and a diaphragm unit 2 stretched in the diaphragm frame 1, wherein a planar coil unit 3 is provided on the diaphragm unit 2.

[0024] The diaphragm unit 2 includes a first diaphragm 21 and a second diaphragm 22 concentrically connected to the first diaphragm 21. The outer diameter of the second diaphragm 22 is wider than that of the first diaphragm 21. The diaphragm unit 2 is connected to the diaphragm frame 1 through the periphery of the second diaphragm 22. The rigidity of the first diaphragm 21 is greater than that of the second diaphragm 22.

[0025] The planar coil unit 3 is located within the range of the first diaphragm 21;

[0026] The planar coil unit 3 includes two planar coil arrays 31 symmetrically disposed on the front and back sides of the diaphragm unit 2, and the two planar coil arrays 31 form a series circuit.

[0027] The coil array includes multiple concentrically distributed planar spiral coils 32 connected in series, and the spiral directions of two adjacent sets of planar spiral coils 32 are set to be opposite.

[0028] The outer edge of the diaphragm frame 1 is provided with a flexible circuit board 4 electrically connected to two planar coil arrays 31. The end of the flexible circuit board 4 away from the diaphragm frame 1 is provided with a pair of wiring pads 5. The wiring pads 5 constitute circuit endpoints in the series circuit formed by the two planar coil arrays 31 on both sides of the diaphragm unit 2.

[0029] In the above embodiment, the rigidity of the first diaphragm 21 is greater than that of the second diaphragm 22, the outer diameter of the second diaphragm 22 is wider than that of the first diaphragm 21, and the diaphragm unit 2 is connected to the diaphragm frame 1 through the periphery of the second diaphragm 22. The planar coil unit 3 is located within the range of the first diaphragm 21. Therefore, this invention forms a suspension structure with lower rigidity than the central region around the planar coil unit 3 through the second diaphragm 22. Thus, it is easy to understand that when a low-frequency signal is input to the planar coil unit 3, the first diaphragm 21 located in the central region of the diaphragm unit 2 can still have a good transient response, while the amplitude of the second diaphragm 22 located in the edge region of the diaphragm unit 2 will be significantly greater than that of the first diaphragm 21, thereby significantly improving the low-frequency performance of the diaphragm.

[0030] Meanwhile, in the above embodiment, the flexible circuit board 4 extends the wiring terminals of the planar coil unit 3 to the outside of the diaphragm frame 1, facilitating the connection of the audio signal lines to the wiring pads 5. Furthermore, the flexible circuit board 4 can be bent, which allows for full utilization of the internal space of headphones by bending and arranging the flexible circuit board 4, making assembly easier.

[0031] In a preferred embodiment, each group of planar helical coils 32 has the same number of turns.

[0032] In another preferred embodiment, the planar spiral coils 32 are equidistant from each other.

[0033] In this invention, the first diaphragm 21 is mainly used to support the coil unit and leverage the inherent transient response advantage of the planar diaphragm, while the second diaphragm 22 is mainly used to construct a suspension structure that enhances low-frequency amplitude between the first diaphragm 21 and the diaphragm frame 1. In a first embodiment, the first diaphragm 21 and the second diaphragm 22 are concentric circular diaphragms, and are stacked and then joined together by hot pressing. In a second embodiment, the first diaphragm 21 is a circular diaphragm, and the second diaphragm 22 is an annular diaphragm concentric with the first diaphragm 21. The inner edge of the second diaphragm 22 overlaps with the outer edge of the first diaphragm 21 and is then joined together by hot pressing. It can be understood that both exemplary embodiments ultimately form a suspension structure with lower rigidity than the central region around the planar coil unit 3 through the second diaphragm 22, and both embodiments can achieve the desired effect of enhancing low-frequency amplitude. In the two exemplary embodiments described above, provided that the rigidity of the first diaphragm 21 is greater than that of the second diaphragm 22, the first diaphragm 21 and the second diaphragm 22 are any one of TPU, TPE, TPR, RB or PET materials.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-frequency amplitude enhancement and welded plate integrated ring coil planar diaphragm, comprising a ring diaphragm frame and a diaphragm unit stretched in the diaphragm frame, wherein a planar coil unit is provided on the diaphragm unit; Its features are: The diaphragm unit includes a first diaphragm and a second diaphragm concentrically connected to the first diaphragm. The outer diameter of the second diaphragm is wider than that of the first diaphragm. The diaphragm unit is connected to the diaphragm frame through the periphery of the second diaphragm, and the rigidity of the first diaphragm is greater than that of the second diaphragm. The planar coil unit is located within the range of the first diaphragm; The planar coil unit includes two planar coil arrays symmetrically disposed on the front and back sides of the diaphragm unit, and the two planar coil arrays form a series circuit. The coil array comprises multiple concentrically distributed planar spiral coils connected in series, and the spiral directions of two adjacent sets of planar spiral coils are set to be opposite. The outer edge of the diaphragm frame is provided with a flexible circuit board electrically connected to two planar coil arrays. The end of the flexible circuit board away from the diaphragm frame is provided with a pair of wiring pads. The wiring pads form circuit endpoints in the series circuit formed by the two planar coil arrays on the front and back sides of the diaphragm unit.

2. The low-frequency amplitude enhancement and welded plate integrated ring coil planar diaphragm according to claim 1, characterized in that: The number of turns is the same in each group of planar helical coils.

3. The low-frequency amplitude enhancement and welded plate integrated ring coil planar diaphragm according to claim 1, characterized in that: The planar spiral coils are spaced equidistantly from each other.

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