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. 04, 2009
Filed:
Mar. 18, 2005
Toshitaka Shimomura, Utsunomiya, JP;
Shingo Nihommori, Himeji, JP;
Miyako Mizutani, Kawasaki, JP;
Eric Herbert Altendorf, Everett, WA (US);
Joseph Daniel Tobiason, Woodinville, WA (US);
Toshitaka Shimomura, Utsunomiya, JP;
Shingo Nihommori, Himeji, JP;
Miyako Mizutani, Kawasaki, JP;
Eric Herbert Altendorf, Everett, WA (US);
Joseph Daniel Tobiason, Woodinville, WA (US);
Mitutoyo Corporation, Kawasaki-shi, JP;
Abstract
A photoelectric encoder has a telecentric optical system in which a first lens and an aperture located at a focal position of the first lens are interposed between a main scale and a photoreceptor. At least a second lens is interposed between the aperture and the photoreceptor with a focus of the second lens on the aperture, thereby constituting a bilateral telecentric optical system. This makes it possible to improve the signal detection efficiency and increase the assembly tolerance.