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. 19, 1991
Filed:
Aug. 28, 1990
Applicant:
Inventor:
Keiji Matsui, Miwa, JP;
Assignee:
Kabushiki Kaisha Okuma Tekkosho, Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356356 ; 356374 ; 2502 / ;
Abstract
In an averaged diffraction moire position detector of the present invention, diffracted lights which have passed through the same places as those through which measuring diffracted lights have passed are used for monitoring a quantity of light. Therefore, change in the quantity of light of a light source and change in the transmittance of diffraction gratings can be suitably corrected.