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:
Sep. 22, 2009
Filed:
Oct. 29, 2007
Takanori Otsuka, Utsunomiya, JP;
Kazuhiko Kodama, Utsunomiya, JP;
Toru Yaku, Kawasaki, JP;
Mitutoyo Corporation, Kawasaki, JP;
Abstract
An optical encoder () is provided with: a light-emitting element () including a main-signal light-emitting element () having a red LED (A) that emits red light and an origin light-emitting element () having an infrared LED (A) that emits infrared light; and a receiver unit () including a main-signal photo detector () that receives the red light to generate a predetermined signal and an origin photo detector () that receives the infrared light to generate a predetermined signal. Accordingly, even when the infrared light enters the main-signal photo detector () or the red light enters the origin photo detector (), no signal is generated by the light, thereby effectively preventing crosstalk. Thus, the measurement accuracy of the optical encoder () can be improved.