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. 18, 2016
Filed:
Mar. 19, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Noboru Suzuki, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A position detecting apparatus includes: a scale having pattern arrays having different cycles of a mover, a sensor detecting phase signals having different cycles based on the scale depending on a position of the mover; a signal processor generating and outputting displacement signals based on the phase signals by switching the displacement signals at a cycle; a detector detecting a speed of the mover based on at least one displacement signal; an absolute calculator deriving the position of the mover based on displacement signals; and a relative calculator deriving a displacement amount with respect to a predetermined position based on a selected displacement signal, wherein the position is calculated by the absolute calculator when the mover moves slow, and when the mover moves fast, the position of the mover is calculated based on an absolute position of the mover obtained in advance and the displacement amount the relative calculator obtained.