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:
Oct. 30, 2007
Filed:
Mar. 08, 2005
Akinobu Umemura, Nagoya, JP;
Hirokazu Ito, Obu, JP;
Akinobu Umemura, Nagoya, JP;
Hirokazu Ito, Obu, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
An acceleration sensor system includes: a first and a second fixed electrodes; a movable electrode for providing a first and a second capacitors; a detection capacitor for detecting a capacitance difference between the first and the second capacitors; a charge voltage conversion circuit for converting a capacitance change of the detection capacitor to an output voltage; a detection bias voltage applying circuit; a vibrating circuit for vibrating the movable electrode such that a displacement bias voltage is applied in a first period and no displacement bias voltage is applied in a second period; a sampling circuit for sampling the output voltage during the second period when the movable electrode is constantly vibrated; and an acceleration signal generating and outputting circuit for generating an acceleration signal on the basis of a sampling result.