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:
Nov. 09, 1976
Filed:
Feb. 11, 1975
Applicant:
Inventor:
Kornelis Bulthuis, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; G11B / ;
U.S. Cl.
CPC ...
178 / ; 1791 / ; 178 / ; 250566 ; 178 / ;
Abstract
An apparatus is described for reading a radiation-reflecting record carrier on which information is stored in an optically readable structure. For separating the modulated and the unmodulated read beam, the radiation path from the radiation source to the record carrier includes a beam-splitting element with such a reflection coefficient that only a small part of the modulated read beam returns to the radiation source, while a sufficiently large part of said beam reaches a radiation-sensitive detector.