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:
Nov. 09, 1993
Filed:
Feb. 25, 1993
Applicant:
Inventor:
Atsushi Ieki, Niwa, JP;
Assignee:
Okuma Corporation, Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
25023118 ; 2502 / ;
Abstract
An optical absolute position encoder capable of obtaining absolute position data in a wide range utilizes the fact that the position of a transmitted or reflected light beam is shifted in accordance with the displacement of a grating window and the fact that the grating window can be specified depending upon the characteristics of the light beam which has passed through the grating window. Furthermore, precise position data is obtained by using two gratings which move relatively. The above-described data are combined with each other so that absolute position data revealing high resolution can accurately be obtained for a long stroke.