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Patent Searching and Data


Title:
ELECTROSTATIC TYPE ELECTROACOUSTIC TRANSDUCER
Document Type and Number:
Japanese Patent JP2001036994
Kind Code:
A
Abstract:

To obtain high wide band frequency characteristics and high heat resistance by forming a diaphragm with the non-expansible thin metal film having thickness of a specified range.

Since a highly expansible metal is generally low in rigidity and there is the possibility of causing permanent deformation due to impulsive sound pressure or the like in the case of forming a very thin film, a non- expansible metal having sufficient rigidity even in the case of forming the thin film is used while evading the highly expansible metal. As the non- expansible metal, nickel, chromium, titanium and the like are exemplified. As the diaphragm of an electrostatic type microphone or the like, it is preferable to use the non-expansible thin metal film of 0.5 to 5 μm thickness. A thin metal film layer is formed on the surface of a substrate by electrodeposition or the like, and the obtained thin metal film layer is separated from the substrate, thereby forming the non-expansible thin metal film. Thus, excellent wide band frequency characteristics can be obtained. Also the heat resistance is remarkably improved, so that the metal film meets a reflow type soldering.


Inventors:
ONO JUN
OBAYASHI YOSHIAKI
YASUDA MAMORU
SAEKI SHINICHI
MIYAKURA TAKASHI
Application Number:
JP1999000233044
Publication Date:
February 09, 2001
Filing Date:
July 16, 1999
Export Citation:
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Assignee:
MATERIAL DESIGN KK
HOSIDEN CORP
International Classes:
H04R19/01; (IPC1-7): H04R19/01
Attorney, Agent or Firm:
竹田 逸郎