WO2020258142A1

WO2020258142A1 - Sound producing device

Info

Publication number: WO2020258142A1
Application number: PCT/CN2019/093229
Authority: WO
Inventors: 张古清
Original assignee: 瑞声声学科技(深圳)有限公司
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-12-30
Also published as: CN210183527U

Abstract

A sound producing device (10), comprising a sound producing monomer (1) and an FPC board (4) electrically connected to the sound producing monomer (1). The sound producing monomer (1) comprises a frame (11) and a magnetic bowl (12) provided on the frame (11). The FPC board (4) is electrically connected to the magnetic bowl (12) by means of a conductive plate (2) to realize grounding, and the conductive plate (2) is welded and fixed with the magnetic bowl (12). The FPC board (4) is electrically connected to the magnetic bowl (12) by means of the conductive plate (2) to realize grounding, and the conductive plate (2) is welded and fixed with the magnetic bowl (12), so that reliable conduction between the FPC board (4) and the magnetic bowl (12) is realized, static electricity generated by the sound producing device (10) can be smoothly eliminated by means of the grounding of the FPC board (4), and the performance of the sound producing device (10) is effectively ensured.

Description

Sound device

Technical field

The present invention relates to the technical field of acoustics, in particular to a sound generating device.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and portable mobile terminal devices. At present, the functions of mobile phones are extremely diverse. One of them is the high-quality music function, and the speaker in the mobile phone is one of the necessary conditions for realizing this high-quality music function.

The prior art speaker includes a magnetic bowl and an FPC board connected to the magnetic bowl, and the static electricity generated by the speaker is eliminated through the grounding of the FPC board. However, when the FPC board and the magnetic bowl are not well connected, it is easy to cause the speaker to have a ground failure problem. Once the problem of ground failure occurs, the static electricity generated by the speaker cannot be eliminated through the FPC board grounding, causing the static electricity to interfere with the magnetic field conducted by the magnetic bowl, thereby affecting the performance of the speaker.

Therefore, it is necessary to provide a sounding device to keep the FPC board and the magnetic bowl in reliable conduction.

technical problem

The purpose of the present invention is to provide a sound generating device, which solves the technical problem of poor conduction between the FPC board and the magnetic bowl in the prior art.

Technical solutions

In order to solve the above technical problems, the technical solutions provided by the present invention are:

A sounding device includes a sounding monomer and an FPC board electrically connected to the sounding monomer. The sounding monomer includes a basin frame and a magnetic bowl arranged on the basin frame. The FPC board is connected to the frame through a conductive plate. The magnetic bowl is electrically connected to achieve grounding, and the conductive plate is welded and fixed to the magnetic bowl.

Wherein, the FPC board is fixed to the conductive board through a conductive adhesive layer.

Wherein, the area of the conductive adhesive layer is smaller than the area of the conductive plate.

Wherein, the FPC board completely covers the conductive adhesive layer, and the FPC board and the conductive adhesive layer cover the same area on the conductive plate.

Wherein, the conductive plate and the magnetic bowl are welded to form solder joints, and the solder joints are located on both sides of the FPC board.

Wherein, the number of the solder joints is three, and the three solder joints are arranged at three vertices of a triangle.

Wherein, the conductive plate is a steel plate.

Wherein, the thickness of the conductive plate is 0.08-0.12 mm.

Wherein, the conductive adhesive layer is a conductive pressure-sensitive adhesive.

Beneficial effect

The present invention provides a sound generating device. The FPC board is electrically connected to the magnetic bowl through a conductive plate to achieve grounding, and the conductive board and the magnetic bowl are welded and fixed, so that reliable conduction between the FPC board and the magnetic bowl is realized, so that the sound generating device generates The static electricity can be smoothly eliminated through the FPC board grounding, effectively ensuring the performance of the sound device.

Description of the drawings

With reference to the drawings, the disclosure of the present invention will be more apparent. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the protection scope of the present invention. In the picture:

Figure 1 is an exploded view of a vocal monomer according to an embodiment of the present invention;

Figure 2 is a schematic perspective view of a sound generating device according to an embodiment of the present invention;

Figure 3 is an exploded view of a sounding device according to an embodiment of the present invention;

Fig. 4 is a manufacturing flow chart of the sound generating device according to an embodiment of the present invention.

Embodiments of the invention

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

Fig. 1 is an exploded view of a vocal monomer according to an embodiment of the present invention.

As can be seen from the figure, the sound-emitting unit 1 includes a basin frame 11 with a receiving space 112, a magnetic bowl 12 connected to the bottom of the basin frame 11 and forming a storage space with the basin frame 11, and a magnetic bowl 12 contained in the receiving space 112. The magnetic circuit system 13 and the vibration system 14; the magnetic circuit system 13 includes a first magnet part 131 and a second magnet part 132, the second magnet part 132 is arranged around the first magnet part 131 and forms a magnetic gap with the first magnet part 131; the vibration system 14 includes a diaphragm 141 fixed on the top of the basin frame 11 and a voice coil 142 whose one end is connected to the diaphragm 141 and the other end is inserted into the magnetic gap and drives the diaphragm 141 to vibrate; the vibration system 14 includes a diaphragm 141 fixed on the top of the basin frame 11 The upper diaphragm 141, one end connected to the upper diaphragm 141, the other end is inserted into the magnetic gap and the voice coil 142 driving the upper diaphragm 141 to vibrate, and the lower diaphragm 143 fixed to the frame 11 and opposite to the upper diaphragm 141 at intervals. .

Fig. 2 is a schematic perspective view of a sound generating device according to an embodiment of the present invention; Fig. 3 is an exploded view of the sound generating device according to an embodiment of the present invention.

It can be seen from the figure that the sounding device 10 includes a sounding unit 1 and an FPC board 4 electrically connected to the sounding unit 1. The sounding unit 1 includes a basin frame 11 and a magnetic bowl 12 arranged on the basin frame 11. FPC The plate 4 is electrically connected to the magnetic bowl 12 through the conductive plate 2 to achieve grounding, and the conductive plate 2 and the magnetic bowl 12 are welded and fixed.

In this embodiment, the FPC board 4 is electrically connected to the magnetic bowl 12 through the conductive board 2 to achieve grounding, and the conductive board 2 and the magnetic bowl 12 are welded and fixed, so that reliable conduction between the FPC board 4 and the magnetic bowl 12 is achieved, thereby The static electricity generated by the sound generating device 10 can be smoothly eliminated through the grounding of the FPC board 4, and the performance of the sound generating device 10 is effectively ensured.

In this embodiment, the FPC board 4 is fixed to the conductive board 2 through the conductive adhesive layer 3.

In this embodiment, the area of the conductive adhesive layer 3 is smaller than the area of the conductive plate 2, so that the conductive adhesive layer 3 attached to the middle of the conductive plate 2 can expose the upper and lower parts of the conductive plate 2, thereby facilitating laser welding.

In this embodiment, the FPC board 4 completely covers the conductive adhesive layer 3, and the area covered by the FPC board 4 and the conductive adhesive layer 3 on the conductive plate 2 is equal, so that the FPC board 4 and the conductive adhesive layer 3 can be reliably They are bonded together to ensure reliable conduction between the FPC board 4 and the magnetic bowl 12.

In this embodiment, the conductive plate 2 and the magnetic bowl 12 are welded to form solder joints 21, the solder joints 21 are located on both sides of the FPC board 4, the number of solder joints 21 is three, and the three solder joints 21 represent three vertices of a triangle. Set up. The triangular welding area formed by the three welding points 21 not only enables the conductive plate 2 to be reliably welded to the magnetic bowl 12, but also saves welding costs. It can be understood that, in an alternative embodiment, the solder joints 21 on both sides of the FPC board 4 are not limited to three, and can be specifically determined according to actual requirements.

In this embodiment, the conductive plate 2 is a steel plate, which has the advantages of high strength, high temperature resistance, high pressure resistance, corrosion resistance, abrasion resistance, and the like. It can be understood that, in an alternative embodiment, the conductive plate 2 may also be a conductive metal plate or a conductive alloy plate. In this embodiment, the thickness of the steel plate is 0.1 mm. After a large number of experimental tests, a steel plate with a thickness of 0.1 mm can not only meet the strength requirements, but also optimize the conduction efficiency of the sound device 10, and can save material costs. It can be understood that, in an alternative embodiment, the thickness of the conductive plate 2 is not limited to 0.1 mm, and can be selected in the range of 0.08-0.12 mm.

In this embodiment, the conductive adhesive layer 3 is a conductive pressure-sensitive adhesive, which is also called a thermosetting conductive adhesive. It can be understood that, in an alternative embodiment, the conductive adhesive layer 3 may also be conductive silver glue or other conductive adhesives.

In this embodiment, the FPC board 4 is provided with a first connecting portion 41 and a second connecting portion 42 extending outward, and the side of the basin frame 11 opposite to the PBC board is provided with a first boss 111 and a second boss 112. The first connecting portion 41 is fixed in the first boss 111 and electrically connected to the voice coil lead; the second connecting portion 42 is fixed in the second boss 112 and electrically connected to the voice coil lead.

Fig. 4 is a manufacturing flow chart of a sound emitting device according to an embodiment of the present invention. Including the following steps:

S102, bonding the FPC board and the first end surface of the conductive adhesive layer;

S104, bonding the second end surface of the conductive adhesive layer to the first end surface of the conductive plate;

S106: Fix the second end surface of the conductive plate to the magnetic bowl by laser spot welding.

The above are only the embodiments of the present invention. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these all belong to the present invention. The scope of protection.

Claims

A sound-producing device, characterized in that it comprises a sound-producing unit and an FPC board electrically connected to the sound-producing unit. The sound-producing unit includes a basin frame and a magnetic bowl arranged on the basin frame. The FPC board Grounding is achieved by electrically connecting the conductive plate and the magnetic bowl, and the conductive plate and the magnetic bowl are welded and fixed.
The sound emitting device according to claim 1, wherein the FPC board is fixed to the conductive board through a conductive adhesive layer.
3. The sound emitting device according to claim 2, wherein the area of the conductive adhesive layer is smaller than the area of the conductive plate.
3. The sound emitting device of claim 3, wherein the FPC board completely covers the conductive adhesive layer, and the FPC board and the conductive adhesive layer cover the same area on the conductive plate.
The sound generating device according to claim 1, wherein the conductive plate and the magnetic bowl are welded to form solder joints, and the solder joints are located on both sides of the FPC board.
The sounding device according to claim 5, wherein the number of the solder joints is three, and the three solder joints are arranged at three vertices of a triangle.
The sounding device according to claim 1, wherein the conductive plate is a steel plate.
The sounding device according to claim 1, wherein the thickness of the conductive plate is 0.08-0.12 mm.
The sound generating device according to claim 1, wherein the conductive adhesive layer is a conductive pressure-sensitive adhesive.