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. 16, 2012
Filed:
Mar. 17, 2010
Mikiya Teraguchi, Kawasaki, JP;
Mikiya Teraguchi, Kawasaki, JP;
Mitutoyo Corporation, Kawasaki, JP;
Abstract
An absolute type linear encoder includes: a scale including a plurality of tracks including a high-order and low-order tracks; and a detection head configured to detect a relative position to the scale; and a processing circuit configured to obtain the number of cycles of the low-order track by using a correction value obtained per correction pitch, the width of which is wider than the detection pitch, based on an error between tracks produced by a difference between the position of the high-order track to the detection head and the position of the low-order track thereto, output values of the high-order track and the low-order track, and a cyclic ratio of the low-order track to the high-order track, and obtain the position of the detection head to the scale based on the number of the cycles and the output value of the low-order track.