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:
Oct. 07, 2003
Filed:
May. 30, 2000
Iwao Komazaki, Urawa, JP;
Eiji Yamamoto, Ome, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An optical displacement sensor includes a laser light source, a scale, a photodetector, and an optical element which refracts light beams to the scale. The scale is displaced in a fashion traversing the light beams and includes a periodic pattern formed thereon to generate a diffractive interference pattern from the light beams. The photodetector receives at least a portion of the pattern and includes a photodetector array comprising plural light receiving areas having a period of np (z +z )/z in a pitch direction of the pattern on a surface of the photodetector. A distance between an emission surface of the laser light source and a surface of the scale is defined as z . A distance between the surface of the scale and a light receiving surface of the photodetector is defined as z . A pitch of the periodic pattern is defined as p , and n denotes a natural number.