Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tohru Yamaoka0
Hiroshi Ogura0
Date of Patent
April 27, 2010
Patent Application Number
10591456
Date Filed
February 24, 2005
Patent Primary Examiner
Patent abstract
An electret condenser 2 includes a fixed electrode 6, a vibrating electrode 5, an electretized silicon dioxide film 7 formed between the electrodes, and silicon nitride films 8 and 9 formed so as to cover the silicon dioxide film 7. The silicon dioxide film 7 covered with the silicon nitride films 8 and 9 is formed on the vibrating electrode 5.
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