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:
Jun. 27, 1978
Filed:
Apr. 04, 1977
Applicant:
Inventors:
Frank L Scholten, Katonah, NY (US);
Francis S Szabo, Mountain Lakes, NJ (US);
Assignee:
Addressograph-Multigraph Corporation, Cleveland, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ; G01D / ;
U.S. Cl.
CPC ...
354-8 ; 354 15 ; 2502 / ; 2502 / ;
Abstract
A shaft encoder of negligible moment of inertia. A grating provides a grid pattern of transmitted light. A mirror on the shaft sweeps the pattern. A lens focuses the sweep over a mask of like grid pattern. A photocell is activated by light transmitted through the mask whenever there is a register of the grating image with the mask. By using a mask of N grid lines per unit of measure, and a mask of N plus 1, two cells will be able to detect direction of shaft rotation.