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Title:
ACCELERATION SENSOR
Document Type and Number:
Japanese Patent JPS6315125
Kind Code:
A
Abstract:
PURPOSE:To well detect acceleration free of the reaction with sound pressure, by arranging an electret film so as to vibrate the same by the vibration of a speaker and providing a through-hole cutting off sound pressure sensitivity of definite frequency or more to a vibration film. CONSTITUTION:An electret film 25 is arranged in a circular case 24 opened at the upper surface thereof so as to provide a gap through the bottom surface 24a of said case 24 and a diaphragm ring 27a and a back plate 26 is arranged to the upper part of the electret film 25 so as to provide a slight gap through a diaphragm ring 27b. Through-holes 25a each having a diameter of about 100mum are provided in the film 25 at four places so as to be not reacted with sound pressure of 5kHz or less and through-holes 26a each having larger than each of the through-holes 25a are provided in the back plate 26 at predetermined places. The acceleration sensor 23 thus constituted is mounted to the vibration plate 5 of a speaker.

Inventors:
TAKASHIMA MITSURU
KISHIGAMI JUN
Application Number:
JP15928286A
Publication Date:
January 22, 1988
Filing Date:
July 07, 1986
Export Citation:
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Assignee:
SONY CORP
International Classes:
G01H11/06; G01P15/125; H04R3/04; H04R19/01; (IPC1-7): G01H11/06; G01P15/125; H04R3/04; H04R19/01



 
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