Magnesium diaphragm, method for manufacturing the same, and speaker using the diaphragm

Abstract

Magnesium diaphragm, method for manufacturing the same, and speaker using the diaphragm. A high-quality magnesium sheet which is less susceptible to influence of oxidation, which realizes a high internal loss, prevention of a drop in sensitivity, and low distortion, and which has a thickness of 30 mu m to 100 mu m is prepared according to rolling process, wherein the level of rolling performed by a rolling mill during each rolling operation is set to 1 mu m to 20 mu m. A magnesium substrate is rolled by rollers while being heated by a thermostatic chamber. Further, as a result of the magnesium sheet being formed into a semi-dome shape or a dome shape, the sheet can be inexpensively manufactured as a speaker for high-tone playback. In particular, in the case of a magnesium diaphragm into which a dome section and an edge section are integrally formed, high-quality sound can be played back in a high frequency range without involvement of a drop in sensitivity.

Description

technical field [0001] The invention relates to a magnesium vibrating film, a manufacturing method thereof and a tweeter using the film. Background technique [0002] Hitherto, a polymer-based material (fiber or resin) or a metal-based material has been preferably used as a diaphragm for a tweeter reproducing speaker (hereinafter referred to as a "tweeter reproducing speaker"). The form of a tweeter using such a diaphragm includes various types such as a dome-shaped speaker and a half-dome-shaped speaker. [0003] A resin film material such as polyimide (PI), polyetherimide (PEI), or polycarbonate (PC) can be used as the resin-based diaphragm for high-pitch playback. Generally, resin-based diaphragms have a low sound transmission velocity "c" (m / s). Therefore, this diaphragm has the physical property of starting to split resonance at low frequencies. Therefore, any tweeter playback speaker using this type of material will encounter the problem of playback echo (back sound...

AI Technical Summary

Problems solved by technology

[0009] However, magnesium is easily oxidized

When the thickness of magnesium is about 30 μm or less, the hardness of magnesium will increase under the influence of the oxide film, thereby deteriorating the performance of magnesium; that is, the internal loss is large

[0010] If the thickness of magnesium is increased to about 100 μm or thicker, the weight of the diaphragm will increase, thereby causing problems of deterioration of speaker performance and reduction of sound sensitivity

[0011] When increasing the effective area of ​​the diaphragm using magnesium, "fh" falls into the hearing range, thereby creating a problem that the sound contains a high level of distortion

Images