Title:
ACOUSTIC DIAPHRAGM AND SPEAKER USING SAME
Document Type and Number:
WIPO Patent Application WO/2019/098225
Kind Code:
A1
Abstract:
This acoustic diaphragm, including a part comprising a base material of a magnesium-based alloy, has excellent acoustic characteristics, the acoustic diaphragm being characterized in that the maximum crystal grain diameter of a crystal becomes larger through heat treatment when observing a cross-section obtained by cutting the base material along the thickness direction of the base material. Preferably, the maximum crystal grain diameter is not less than 50 μm, and the loss tangent of the part comprising the base material of the magnesium-based alloy is not less than 0.0056.
Inventors:
SUZUKI NANAYO (JP)
SUZUKI TOMOYUKI (JP)
ITANO TETSUSHI (JP)
DAN TAKAYUKI (JP)
HIGASHI HIROFUMI (JP)
SUZUKI TOMOYUKI (JP)
ITANO TETSUSHI (JP)
DAN TAKAYUKI (JP)
HIGASHI HIROFUMI (JP)
Application Number:
PCT/JP2018/042101
Publication Date:
May 23, 2019
Filing Date:
November 14, 2018
Export Citation:
Assignee:
TODA CO LTD (JP)
PANASONIC IP MAN CO LTD (JP)
PANASONIC IP MAN CO LTD (JP)
International Classes:
H04R7/02; C22C23/00; C22F1/06
Foreign References:
| JP2014152354A | 2014-08-25 | |||
| JP2006183089A | 2006-07-13 | |||
| JP2007288258A | 2007-11-01 | |||
| JP2002369284A | 2002-12-20 |
Attorney, Agent or Firm:
OKUBO, Katsuyuki (JP)
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