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. 28, 1998
Filed:
Apr. 08, 1996
Applicant:
Inventors:
Peter Speckbacher, Kirchweidach, DE;
Georg Flatscher, Schneizlreuth, DE;
Michael Allgauer, Stein, DE;
Erich Bayer, Trostberg, DE;
Erwin Spanner, Traunstein, DE;
Andreas Franz, Trostberg, DE;
Assignee:
Johannes Heidenhain GmbH, Traunreut, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G03H / ;
U.S. Cl.
CPC ...
359572 ; 359566 ; 359569 ; 359900 ; 430-1 ; 430-2 ;
Abstract
The phase grating of the present invention includes a substrate with a reflective, continuous layer disposed thereon on which a structured spacer layer 3 of dielectric material is applied. To form a phase grating that can be used as a scale in photoelectric position measuring instruments, a further thin reflective surface layer is located solely on the reflective, continuous surfaces, parallel to the layer, of the structured spacer layer.