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:
Jun. 29, 2004
Filed:
Dec. 03, 2001
Masami Yakabe, Hyogo, JP;
Toshiyuki Matsumoto, Hyogo, JP;
Yoshihiro Hirota, Kyoto, JP;
Kouichi Nakano, Hyogo, JP;
Tokyo Electron Limited, Tokyo, JP;
Abstract
A second operational amplifier ( ) of a core unit ( ) shorts an inverting input terminal and an output terminal. A signal line ( ) is connected to a non-inverting input terminal. A capacitive sensor ( ) is connected to the signal line ( ). A first operational amplifier ( ) earths the non-inverting input terminal. One end of a first resistance ( ) and one end of a second resistance ( ) are respectively connected to the inverting input terminal. The other end of the first resistance ( ) is connected to an alternate current voltage generator ( ). The other end of the second resistance ( ) is connected to the output terminal of the first operational amplifier ( ). A signal output terminal ( ) of the core unit ( ) is connected to an inverting amplification device ( ). An alternate output terminal ( ) of the core unit ( ) and an inverting output terminal ( ) of the inverting amplification device ( ) are connected to an addition device ( ). The non-inverting input terminal of operational amplifiers ( ) and ( ).