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:
May. 31, 2011
Filed:
Sep. 16, 2004
Nobuharu Hama, Hachinohe, JP;
Nobuharu Hama, Hachinohe, JP;
Tamagawa Seiki Co., Ltd., Aomori, JP;
Abstract
As shown in FIG., a position detector () includes: an object to be detected having a pattern () formed for generating a position signal; and a sensor () for detecting the position signal according to the pattern () by receiving an electromagnetic wave generated on the object () by light irradiation. The pattern () is formed in a gradation shape visibly or invisibly so that an electromagnetic wave having a wavelength continuously different depending on the position on the object () can be sent to the sensor (). This enables detection of an absolute angle of a rotary object and an absolute position on an XY plane with a simpler configuration, simplifies the device assembly, and reduces the device size.