CN106851518B

CN106851518B - Method for manufacturing vibrating diaphragm

Info

Publication number: CN106851518B
Application number: CN201611108334.6A
Authority: CN
Inventors: 周伟国; 秦广华; 姜君; 王永康
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2016-12-06
Filing date: 2016-12-06
Publication date: 2020-03-20
Anticipated expiration: 2036-12-06
Also published as: CN106851518A

Abstract

The invention provides a diaphragm manufacturing method, which comprises the following steps: providing a die, wherein the die comprises an upper die and a lower die; providing a film material for forming the vibrating diaphragm, and placing the film material in the lower die and preheating; providing a plastic material layer required for forming the folds of the diaphragm, and placing the plastic material layer at the positions, corresponding to the folds to be formed, of the diaphragm, of the upper die; pressing the upper die to the lower die to enable the plastic material layer to be attached to the film material; and heating the membrane material and the plastic material layer and performing air blowing molding to form the vibrating membrane. The method for manufacturing the vibrating diaphragm adopts two modes of gas explosion forming and plastic material laminating forming to combine, so that the strength of the corrugated part of the vibrating diaphragm is enhanced, and the distortion at low frequency is reduced.

Description

Method for manufacturing vibrating diaphragm

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of diaphragm manufacturing, in particular to a diaphragm manufacturing method.

[ background of the invention ]

With the increasing market demand, mobile phones are gradually becoming thinner and have better and better sound quality, which requires the acoustic devices in mobile phones to be smaller, thinner and higher in sound quality. The diaphragm is a core component of an acoustic device such as a loudspeaker, and the requirement for the acoustic performance of the diaphragm is increased accordingly.

In the related art, the diaphragm is usually formed by gas explosion, that is, a film material is placed on a mold and sealed in a gas hood, and is formed at a certain temperature. The wrinkle part of the diaphragm obtained by the manufacturing method has a soft phenomenon, so That Harmonic Distortion (THD) is high, and certain distortion exists at low frequency.

Therefore, it is necessary to provide a new diaphragm manufacturing method to solve the above problems.

[ summary of the invention ]

The invention aims to provide a method for manufacturing a vibrating diaphragm by combining a gas explosion forming mode and a high-plasticity material laminating forming mode.

The technical scheme of the invention is as follows: a diaphragm manufacturing method comprises the following steps:

providing a die, wherein the die comprises an upper die and a lower die;

providing a film material for forming the vibrating diaphragm, and placing the film material in the lower die and preheating;

providing a plastic material layer required for forming the folds of the diaphragm, and placing the plastic material layer at the positions, corresponding to the folds to be formed, of the diaphragm, of the upper die;

pressing the upper die to the lower die to enable the plastic material layer to be attached to the film material;

and heating the membrane material and the plastic material layer and performing air blowing molding to form the vibrating membrane.

Preferably, the vibrating diaphragm comprises a dome and a folded ring part located at the edge of the dome and surrounding the dome, the folded ring part is rectangular, and the folds are arranged at four corner positions of the folded ring part.

Preferably, the number of the plastic material layers is four, and the four plastic material layers are respectively attached to four corner positions of the folding ring part to form the folds.

Preferably, the layer of plastic material is polytetrafluoroethylene.

The invention has the beneficial effects that: according to the manufacturing method of the vibrating diaphragm, the plastic material layer and the film material are attached and molded to form the folds at the folding ring corners of the vibrating diaphragm, the strength of the folding ring folds can be effectively improved, the THD value is reduced, and the distortion degree of the vibrating diaphragm at low frequency is improved.

[ description of the drawings ]

FIG. 1 is a flow chart of a diaphragm manufacturing method according to the present invention;

FIG. 2 is a schematic structural diagram of a diaphragm obtained by applying the diaphragm manufacturing method of the present invention;

fig. 3 is a graph showing the relationship between harmonic distortion and frequency of diaphragms obtained by different manufacturing methods.

[ detailed description ] embodiments

The invention is further described with reference to the following figures and embodiments.

Referring to fig. 1-fig. 2, fig. 1 is a flow chart of a diaphragm manufacturing method according to the present invention; fig. 2 is a schematic structural diagram of a diaphragm obtained by applying the diaphragm manufacturing method of the present invention. A diaphragm manufacturing method comprises the following steps:

step S1, providing a mould which comprises an upper mould and a lower mould;

step S2, providing a film material for forming the diaphragm 1, and placing the film material in the lower die and preheating the film material;

the vibrating diaphragm 1 comprises a dome 11 and a folded ring part 12 which is positioned at the edge of the dome 11 and surrounds the dome 11, and folds 13 are arranged at the corners of the folded ring part 12. The folded ring part 12 is rectangular, and the wrinkles 13 are arranged at four corner positions of the folded ring part 12. In this step, the film material is used to mold the dome 11 and the loop portion 12 of the diaphragm 1.

Step S3, providing a plastic material layer required for molding the corrugations 13 of the diaphragm 1, and placing the plastic material layer at the positions, corresponding to the corrugations 13 to be formed, of the diaphragm 1, of the upper mold;

in this step, the plastic material layer is polytetrafluoroethylene. The number of the plastic material layers is four, and the four plastic material layers are respectively attached to the four corner positions of the folded ring part 12 to form the folds 13.

Step S4, pressing the upper mold to the lower mold, so that the plastic material layer is bonded to the film material;

specifically, the upper die laminates the plastic material layer to four corners of the folded ring part 12 to form the wrinkles 13, so that the strength of the corners of the folded ring part 12 is improved, the THD value is reduced, and the effect of improving the distortion of the loudspeaker at low frequency is achieved.

Step S5, heating and blow-molding the film material and the plastic material layer to form the diaphragm 1.

Please refer to fig. 3, which is a graph of harmonic distortion and frequency of diaphragms obtained by different manufacturing methods. Wherein A is a change curve between harmonic distortion and frequency of the diaphragm obtained by adopting an original gas explosion forming processing process, and B is a change curve between harmonic distortion and frequency of the diaphragm obtained by adopting a laminating forming process but not adopting a high-plasticity material process; and C is a curve of harmonic distortion and frequency of the diaphragm obtained by applying the diaphragm manufacturing method. As can be seen from the figure, the diaphragm obtained by applying the diaphragm manufacturing method of the invention has small harmonic distortion and small distortion degree at low frequency, and effectively improves the distortion at low frequency.

Compared with the prior art, the plastic material layer is attached to the film material in the manufacturing method of the vibrating diaphragm to form the folds at the corners of the folding rings of the vibrating diaphragm, so that the manufacturing method can effectively improve the strength of the folds and reduce the THD value, and the distortion degree of the vibrating diaphragm at low frequency is improved.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. A diaphragm manufacturing method is characterized by comprising the following steps:

providing a die, wherein the die comprises an upper die and a lower die;

2. The method for manufacturing a diaphragm according to claim 1, wherein the diaphragm includes a dome and a folded ring portion located at an edge of the dome and surrounding the dome, the folded ring portion is rectangular, and the folds are disposed at four corner positions of the folded ring portion.

3. The diaphragm manufacturing method of claim 2, wherein the number of the plastic material layers is four, and four of the plastic material layers are respectively attached to four corner positions of the loop portion to form the corrugations.

4. The diaphragm manufacturing method of claim 1, wherein the plastic material layer is polytetrafluoroethylene.