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:
Aug. 25, 1998
Filed:
Mar. 20, 1997
Eiji Yamamoto, Ome, JP;
Masataka Ito, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A optical displacement sensor comprises optical output detecting unit for detecting an optical output from the semiconductor laser, which changes in accordance with the phase of return light reflected by the external reflection unit, when an optical distance between the semiconductor laser and the external reflection unit changes at a change rate, optical distance modulation unit for changing the optical distance at predetermined periods by an amount of modulation of the optical distance at a rate higher than the change rate, and a detection circuit system for detecting the amount and direction of change of the optical distance based on an optical output from the optical output detecting unit detected in synchronism with a timing of modulating the optical distance by the optical distance modulation unit.