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:
Jul. 09, 1985
Filed:
Nov. 09, 1982
Sadahiro Tamura, Kyoto, JP;
Toshio Nishikawa, Nagaokakyo, JP;
Abstract
An apparatus for detecting a variation of an electrostatic capacitance is advantageously utilized for reproducing information from a groove or pit formed on a disc of a CED type or a VHD type, for example, and comprises an oscillator and a resonance circuit each including a dielectric resonator, wherein the oscillator and the resonance circuit are capacitively coupled, while the resonance frequency of the resonance circuit is changed in accordance with a change of the electrostatic capacitance to be detected, whereby a signal output dependent on a variation of the electrostatic capacitance is obtained from a detector directly coupled to the resonance circuit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile