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:
Feb. 05, 1991
Filed:
Apr. 19, 1989
Applicant:
Inventor:
Souji Ichikawa, Sagamihara, JP;
Assignee:
Mitutoyo Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ; H03M / ;
U.S. Cl.
CPC ...
364560 ; 25023114 ; 2502 / ; 33707 ; 356144 ; 341 13 ;
Abstract
An absolute position type of displacement detector employs multiple grating tracks. The pitches of the gratings in the respective tracks are set to be just slightly different so as to detect an absolute position from a small number of analog signals by a vernier. The number of tracks is set to be three or more so as to multiply the vernier, thereby enabling absolute position measurement in a wide measurement range.
Ichikawa, Souji. (1991). Displacement detector (U.S. Patent No. 4991125). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4991125
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile