Title:
METHOD FOR MANUFACTURING ACOUSTIC MAGNESIUM DIAPHRAGM AND ACOUSTIC MAGNESIUM DIAPHRAGM
Document Type and Number:
WIPO Patent Application WO/2017/078010
Kind Code:
A1
Abstract:
Provided is a method capable of efficiently manufacturing an acoustic magnesium diaphragm exhibiting excellent rustproof performance and having excellent acoustic characteristics. According to the present invention, a rustproof processing step for forming a hydroxide layer 2 on a surface of a magnesium base material 1 under a high pressure condition of approximately 1.1-350 atm is performed in a sealed container, so that the hydroxide layer 2 which is dense and has a high hardness can be formed on the surface of the magnesium base material 1. Accordingly, the magnesium base material 1 is thinned and the hardness thereof is improved through the rustproof processing, and thus, increase in the weight of the magnesium base material 1 can be suppressed. Therefore, an acoustic magnesium diaphragm having acoustic characteristics which are improved by achieving reduction in weight and increase in surface hardness can be manufactured.
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Inventors:
SUZUKI NANAYO (JP)
SUZUKI TOMOYUKI (JP)
KATO SHINJIRO (JP)
HARADA KAZUO (JP)
KONISHI TOUSAKU (JP)
SUZUKI KIMIE (JP)
SUZUKI TOMOYUKI (JP)
KATO SHINJIRO (JP)
HARADA KAZUO (JP)
KONISHI TOUSAKU (JP)
SUZUKI KIMIE (JP)
Application Number:
PCT/JP2016/082420
Publication Date:
May 11, 2017
Filing Date:
November 01, 2016
Export Citation:
Assignee:
TODA CO LTD (JP)
International Classes:
H04R7/02; C23C22/60; H04R31/00
Domestic Patent References:
| WO2011021571A1 | 2011-02-24 |
Foreign References:
| JP2000064057A | 2000-02-29 | |||
| JPS5975795A | 1984-04-28 | |||
| JP2000152375A | 2000-05-30 | |||
| JP2007068017A | 2007-03-15 | |||
| JP2013023768A | 2013-02-04 |
Attorney, Agent or Firm:
OKUBO, Katsuyuki (JP)
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