Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2007-12-18
2007-12-18
Kim, Paul D. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S592100, C029S609100, C156S073100, C156S250000, C156S267000, C156S292000, C156S293000, C156S297000, C381S113000, C381S116000, C381S174000, C381S191000
Reexamination Certificate
active
10843587
ABSTRACT:
In a rolling process, the level of rolling performed by a rolling mill for one operation is set to 1 μm to 20 μm. A magnesium substrate is rolled by rollers while being heated by a thermostatic chamber. As a result, there is manufactured 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 μm to 100 μm. 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.
REFERENCES:
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patent: 5129960 (1992-07-01), Chang et al.
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patent: 0 339 855 (1989-11-01), None
patent: 2002-369284 (2002-12-01), None
patent: WO 91/13181 (1991-09-01), None
Kasahara Yuichi
Kudo Yoshimi
Sato Masatoshi
Tomiyama Hiroyuki
Kim Paul D.
Pioneer Corporation
Tohoku Pioneer Corporation
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