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. 23, 2013
Filed:
Feb. 14, 2011
Kunitaka Okada, Osaka, JP;
Masahisa Niwa, Osaka, JP;
Kunitaka Okada, Osaka, JP;
Masahisa Niwa, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The position sensor includes a moving member configured to be displaced in response to displacement of a measurement target, a resonant unit, an oscillation unit, a signal processing unit, an output unit, a signal absence detection unit, and a low-pass filter. The resonant unit includes a detection coil. The oscillation unit is configured to output an oscillation signal. The signal absence detection unit is configured to judge whether or not the oscillation signal is output from the oscillation unit. The low-pass filter is configured to have a cut-off frequency which passes the oscillation signal corresponding to the resonant frequency of the resonant unit in a normal condition, but blocks the oscillation signal output from the oscillation unit when the resonant unit sees an oscillation at an abnormal frequency.