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:
May. 20, 2003
Filed:
Oct. 19, 2001
Masakazu Hatanaka, Osaka, JP;
Satoshi Ouchi, Hyogo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention aims at improving detection sensitivity of an angular rate sensor that uses a tuning fork vibrator composed of mono-quartz piezoelectric material such as crystallized quartz. To achieve this purpose, the present invention includes a tuning fork vibrator ( ) having two tuning fork prongs ( ) and ( ), and a tuning fork base ( ), comprised of two vibrators ( ) and ( ) directly bonded into one piece in an orientation of their thickness in a manner that they are oriented in a direction of crystallographic axis that produces piezoelectric phenomenon of reversed polarity with respect to each other in a lateral direction. There are electrodes ( ), ( ), ( ) and ( ) for detection, disposed to interior-side surfaces and exterior-side surfaces of both of the tuning fork prongs ( ) and ( ), and electrodes ( ) and ( ) for driving, disposed to both of the tuning fork prongs ( ) and ( ) in a such relation to the electrodes ( ), ( ), ( ) and ( ) for detection as to cancel capacitive couplings from the driving side to the detection side.