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:
Sep. 18, 2001
Filed:
Jul. 14, 2000
Kazuhiro Wakabayashi, Osaka, JP;
Nohken Inc., Osaka, JP;
Abstract
From the time of power on, an output of a variable frequency generating circuit is kept matching with the resonance frequency of a resonance circuit. When an object of detection comes into contact or to the vicinity of a detection electrode and the resonance frequency of resonance circuit changes, a phase deviation is generated from the output of the variable frequency generating circuit. The deviation is detected by a phase comparing circuit, and a control circuit changes a control voltage so that the oscillation frequency of variable frequency generating circuit is changed to attain phase matching. This change is detected by a detection circuit, and presence/absence of the object is detected.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile