Title: Magnesium diaphragm, method for manufacturing the same, and speaker using the diaphragm
Application Number: 200410045848 Application Date: 2004.05.20
Publication Number: 1551682 Publication Date: 2004.12.01
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: B21B1/22,H04R7/02,H04R31/00
Applicant(s) Name: Pioneer Corp. Address:
Inventor(s) Name: Tomiyama Hiroyuki, Kasahara Yuichi, Kudo Yoshimi
Attorney & Agent: tao fengbei hou yu
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.
Time: 10
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