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:
Jul. 12, 1988
Filed:
Sep. 22, 1986
Applicant:
Inventor:
Makoto Sagara, Numazu, JP;
Assignee:
Toshiba Kikai Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ; G01B / ; G06K / ;
U.S. Cl.
CPC ...
356383 ; 356373 ; 356375 ; 356385 ; 382 15 ; 382 48 ;
Abstract
Apparatus for measuring a displacement of a movable member or a diameter of a cylindrical member comprises a photoelectric converting element array to convert light reflected by the surface of the member for producing an electric signal utilized to form a pattern information of the surface. The characterizing points of the pattern information are extracted and binarized into a binary pattern information which is compared with a reference pattern information. The difference between them is accumulated to determine the displacement. To measure a diameter the displacement thus obtained is divided by circular constant n.