The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 2003
Filed:
Jun. 04, 2001
Bosch Electronics Corporation, Gunma, JP;
Abstract
The present invention relates to an acceleration sensor which can be provided in a place with extreme ambient temperature variations, for example, near a vehicle engine, and an acceleration detecting system having the acceleration sensor, which are used to control an occupant protection device such as an airbag. In an acceleration sensor ( ), gain of an amplifier circuit ( ) which differentially amplifies outputs of a piezo-electric element ( ) is adjusted by temperature compensation means ( ), and thereby an output-temperature characteristic of the piezo-electric element ( ) is compensated. Also, a capacitor ( ) is inserted in parallel with the piezo-electric element ( ), and thereby a composite capacity is increased. By this, a lower cut-off frequency is set to a lower frequency without increasing resistor values of a bias resistor circuit ( ). The acceleration sensor ( ) is provided in a front part of a vehicle, and its sensor output is received by a receiving circuit ( ) provided in a vehicle room.