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:
Feb. 22, 1977
Filed:
Oct. 03, 1975
Reinhold Deml, Munich, DT;
Ulrich Greis, Weyarn, DT;
AGFA-Gevaert A.G., Leverkusen, DT;
Abstract
An optical apparatus is provided with an objective and an autocollimation lens having a position and orientation bearing a known relationship to the position and orientation of the objective. A grating has alternating transmissive and non-transmissive portions. The grating is so positioned relative to the autocollimation path of the autocollimation lens that the latter projects an image of the grating onto the subject, and the image of the grating on the subject is projected back onto the grating. A photoelectric detector derives from the light projected back onto the grating an electrical signal indicative of the degree of focus of the objective. The setting of the objective is controlled in dependence upon the electrical signal.