CN101394684A

CN101394684A - Composite diaphragm and its making method

Info

Publication number: CN101394684A
Application number: CNA2007100771841A
Authority: CN
Inventors: 朱秉科; 李林珍
Original assignee: AAC Acoustic Technologies Changzhou Co Ltd
Current assignee: AAC Technologies Holdings Changzhou Co Ltd
Priority date: 2007-09-17
Filing date: 2007-09-17
Publication date: 2009-03-25

Abstract

The invention discloses a composite diaphragm and a manufacturing method thereof. The composite diaphragm mainly comprises a folding ring with a planar centre, a planar top dome and an aluminum foil, wherein, the planar top dome of the composite diaphragm is formed by veneer, and the surface of the veneer is painted. The composite diaphragm has the advantages that the manufacturing method is simple, and the high-frequency cut-off frequency can be regulated.

Description

Composite diaphragm and manufacture method thereof

[technical field]

The present invention relates to a kind of mini-sound device, particularly a kind of composite diaphragm structure of Microspeaker.

[background technology]

Along with improving constantly of the market demand, mobile phone develops to the slimming direction gradually, and requires its sound quality to become better and better, and this just requires the acoustical device in the mobile phone to develop towards small-sized, slim, high tone quality.Vibrating diaphragm is the core component of acoustical device such as loud speaker, and the requirement of its acoustical behavior is also just improved thereupon.

In existing technology, the commonly used vibrating diaphragm of loud speaker as shown in Figure 1, this vibrating diaphragm 1 ' with its on ball top 2 ' by commaterial by hot forming, can't take into account the performance of low frequency and high frequency simultaneously, when requiring lower low frequency, need softer material do vibrating diaphragm, and ring is when softer, its ball top also can be softer, influence high frequency performance, therefore, though the manufacture method of this vibrating diaphragm is simpler, be difficult to the performance of loud speaker is regulated.

At present in order to improve the acoustical behavior of acoustical devices such as loud speaker, to the vibrating diaphragm of loud speaker make improvements more.

In the Chinese patent ZL 03136666.X of bulletin on March 7th, 2007, disclosed a kind of method that nano level metal film or oxide-film are plated in sputter on vibrating diaphragm and edge, this method can be regulated the performance of mini-sound device, but, the thickness of coating of nano level metal film or oxide-film is thinner, regulating action to performance is not obvious, and this coating process is complicated, and production cost is higher.

How to provide a kind of manufacture method simple, and can regulate the vibrating diaphragm of acoustical behavior, just become one of research topic.

[summary of the invention]

The object of the present invention is to provide a kind of manufacture method simple, and can regulate the composite diaphragm and the manufacture method thereof of high-frequency cut-off frequency.

The object of the present invention is achieved like this:

A kind of composite diaphragm, comprise the center be the plane soft ring, to compare soft ring be ball top, hard plane and aluminium foil.Wherein, plane ball top be positioned at soft ring above, its lower surface is connected with the plane at soft ring center, aluminium foil be positioned at ball top, plane above, and be connected with the upper surface on plane ball top, this plane ball pushes up and is made of wooden skin.The high-frequency cut-off frequency that the aluminium foil of ball top, plane upper surface can be regulated loud speaker, the size of aluminium foil is decided by the front end frequency bandwidth of loud speaker.

As a kind of improvement of composite diaphragm of the present invention, the surface lacquer on plane ball top.Surface lacquer on plane ball top, one side can cover the true qualities and the wood grain of wooden skin, improves outward appearance, can strengthen the rigidity and the intensity of wooden skin on the other hand.

The present invention provides a kind of manufacture method of composite diaphragm in addition, and its step comprises: a wooden skin is provided; Surface lacquer at wooden skin; One aluminium foil is provided; The upper surface of aluminium foil with the wooden skin that sprays paint is connected; To post the shape that the wooden skin of spraying paint of aluminium foil is die-cut into to be needed, form the ball top, plane of posting aluminium foil; It is the soft ring on plane that one center is provided; The lower surface that posts the ball top, plane of aluminium foil is connected with the plane at soft ring center.

Compared with prior art, the present invention has the following advantages: the ball top, plane of composite diaphragm is made of wooden skin, the wood skin is a kind of anisotropic material, difference according to its grain direction, it has different young modulus in different directions, and therefore the relative position of the long limit that can push up according to the grain direction and the plane ball of wooden skin or broadside is adjusted the high-frequency cut-off frequency of product; The simpler of composite diaphragm, production cost is lower.

[description of drawings]

Fig. 1 is the diaphragm structure figure of prior art.

Fig. 2 is the structure chart of composite diaphragm of the present invention.

[embodiment]

Below in conjunction with accompanying drawing, composite diaphragm of the present invention and manufacture method thereof are elaborated.

Composite diaphragm 1 of the present invention is used for miniature electro-acoustic transducers such as Microspeaker or receiver.

Please refer to Fig. 2, composite diaphragm 1 comprises soft ring 2, compares soft ring 2 for hard ball top 3, plane and aluminium foil 4, and a plane 5 is arranged at the center of soft ring.

Plane ball top 3 be positioned at soft ring 2 above, the lower surface on plane ball top 3 is connected with the plane 5 at soft ring 2 centers, the method connection of preferred gummed;

Aluminium foil 4 be positioned at plane ball top 3 above, aluminium foil 4 is connected with the upper surface on plane ball top 3, the method connection of preferably gluing together, aluminium foil 4 can be regulated the high-frequency cut-off frequency of loud speaker, the size of aluminium foil 4 is decided by the front end frequency bandwidth of loud speaker;

Plane ball top 3 is made of wooden skin, can adjust the high-frequency cut-off frequency of product according to the relative position of the long limit on the grain direction of wooden skin and plane ball top 3 or broadside, experiment at a certain product that uses present embodiment shows, if grain direction is parallel with the long limit on plane ball top 3, its high-frequency cut-off frequency is 6kHz, if and grain direction is parallel with the broadside on plane ball top 3, its high-frequency cut-off frequency can be widened 9kHz;

At the surface lacquer on plane ball top 3, one side can cover the true qualities and the wood grain of wooden skin, improves outward appearance, can strengthen the rigidity and the intensity of wooden skin on the other hand.

A kind of method of making composite diaphragm 1 may further comprise the steps:

One wooden skin is provided; Surface lacquer at wooden skin; One aluminium foil 4 is provided; The upper surface of aluminium foil 4 with the wooden skin that sprays paint is connected, and the method for preferred gummed connects; To post the shape that the wooden skin of spraying paint of aluminium foil 4 is die-cut into to be needed, form the ball top, plane 3 of posting aluminium foil; It is the soft ring 2 on plane 5 that one center is provided; The lower surface that posts the ball top, plane 3 of aluminium foil 4 is connected with the plane 5 at soft ring 2 centers, and the method for preferred gummed connects.

The above only is a better embodiment of the present invention; protection scope of the present invention is not exceeded with above-mentioned execution mode; as long as the equivalence that those of ordinary skills do according to disclosed content is modified or changed, all should include in the protection range of putting down in writing in claims.

Claims

1. composite diaphragm, it is characterized in that: comprise the center be the plane soft ring, to compare soft ring be ball top, hard plane and aluminium foil, wherein, plane ball top be positioned at soft ring above, its lower surface is connected with the plane at soft ring center, aluminium foil be positioned at plane ball top above, and is connected with the upper surface on plane ball top, the plane ball pushes up and is made of wooden skin.

2. composite diaphragm as claimed in claim 1 is characterized in that: the surface on described plane ball top is provided with enamelled coating.

3. the manufacture method of a composite diaphragm as claimed in claim 1, it is characterized in that: this method may further comprise the steps:

A., one wooden skin is provided;

B. at the surface lacquer of wooden skin;

C., one aluminium foil is provided;

D. the upper surface of aluminium foil with the wooden skin that sprays paint is connected;

E. will post the shape that the wooden skin of spraying paint of aluminium foil is die-cut into to be needed, form the ball top, plane of posting aluminium foil;

F., it is the soft ring on plane that one center is provided;

The lower surface that g. will post the ball top, plane of aluminium foil is connected with the plane at soft ring center.