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. 29, 2003
Filed:
May. 24, 2000
Applicant:
Inventors:
Sukoya Tawaratsumida, Osaka, JP;
Katsuhiro Teramae, Osaka, JP;
Assignee:
Matsushita Electric Works, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B 7/30 ;
U.S. Cl.
CPC ...
G01B 7/30 ;
Abstract
A sensor is configured to comprise a detection coil into which a metallic shaft to be detected, a reference coil having the same specifications as those for the detection coil , drive oscillator circuits for generating high-frequency magnetic fields in the detection coil and the reference coil , and a comparator for outputting a detection signal, which indicates that the shaft to be detected is detected, according to the difference between an oscillation signal, which is outputted from the detection coil according to an inserted state of the shaft to be detected, and an oscillation signal outputted from the reference coil