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:
Mar. 28, 1989
Filed:
Oct. 22, 1986
Applicant:
Inventor:
Klaus-Dieter Schaefer, Braunfels, DE;
Assignee:
Ernst Leitz Wetzlar GmbH, , DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250201 ; 354407 ;
Abstract
A scanning grating for a focusing detector and a focusing detector are described. The scanning grating serves as an image scanner and spatial frequency filter and includes at least two surface elements splitting up an incident luminous flux into two spatially separate light fluxes and by means of which, in conjunction with a field lens, two images of the exit pupil, or parts thereof, of an associated optical system are generated in a plane in which at least two photo-receiver systems are mounted. Means acting optically as complementary plane-parallel plates are provided to split up the luminous flux from the optical system into two spatially separate light fluxes.