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:
May. 26, 1981
Filed:
Sep. 19, 1977
Applicant:
Inventors:
Willem G Opheij, Eindhoven, NL;
Peter F Greve, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; G01J / ;
U.S. Cl.
CPC ...
250204 ; 3581285 ;
Abstract
An apparatus as described for reading an optical radiation-reflecting information carrier, which apparatus comprises an opto-electronic focussing error detection system with two focussing detectors. The path of the read beam which has been reflected by the information carrier and which originates from the read spot includes a single radiation-deflecting element, in such a way that the radiation which is incident on this element is deflected towards the focussing detectors.