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:
Apr. 04, 2006
Filed:
Sep. 06, 2002
Masami Yakabe, Tokyo, JP;
Naoki Ikeuchi, Tokyo, JP;
Toshiyuki Matsumoto, Tokyo, JP;
Koichi Nakano, Hyogo, JP;
Masami Yakabe, Tokyo, JP;
Naoki Ikeuchi, Tokyo, JP;
Toshiyuki Matsumoto, Tokyo, JP;
Koichi Nakano, Hyogo, JP;
Tokyo Electron Limited, Tokyo, JP;
Abstract
An electrostatic capacitance detection circuitcomprises an AC voltage generatoran operational amplifierof which non-inverting input terminal is connected to specific potential (a ground in this example), an impedance convertera resistance (R)connected between the AC voltage generatorand an inverting input terminal of the operational amplifiera resistance (R)connected between the inverting input terminal of the operational amplifierand an output terminal of the impedance converterand an impedance element (a capacitor)connected between an output terminal of the operational amplifierand an input terminal of the impedance converterA capacitor to be detectedis connected between the input terminal of the impedance converterand the specific potential.