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:
Mar. 01, 2005
Filed:
Oct. 25, 2002
Yuji Kasai, Tsukuba, JP;
Hirokazu Nosato, Kashiwa, JP;
Masahiro Murakawa, Tsukuba, JP;
Taro Itatani, Tsukuba, JP;
Tetsuya Higuchi, Tsukuba, JP;
Yuji Kasai, Tsukuba, JP;
Hirokazu Nosato, Kashiwa, JP;
Masahiro Murakawa, Tsukuba, JP;
Taro Itatani, Tsukuba, JP;
Tetsuya Higuchi, Tsukuba, JP;
Abstract
A capacitance position sensor includes a pair of opposed tabular electrodes, an LC oscillator circuit having a toroidal core winding and whose oscillating frequency varies with change in capacitance between the pair of electrodes, and an arithmetic processing unit for calculating an absolute value of a distance between the electrodes from the oscillating frequency of the oscillator circuit. A position controller includes a stationary member formed with one electrode of the pair of electrodes of the position sensor, a movable member on which the other electrode of the pair of electrodes is formed, and moving device for moving the movable member relative to the stationary member.