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:
Dec. 22, 1992
Filed:
Apr. 25, 1991
Applicant:
Inventor:
Andreas Franz, Kienberg, DE;
Assignee:
Dr. Johannes Heidenhain GmbH, Traunreut, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
25023116 ; 2502 / ;
Abstract
An interference type angle measuring device has a graduated disk with a circular graduation. This circular graduation is scanned by a scanning device, which is constructed as a monolithically integrated optical circuit with two diametrical scanning areas. Simply structured coupling and decoupling grids are used as coupling elements, which have also simply constructed correction grids placed upstream or downstream thereof.