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:
Jun. 05, 1990
Filed:
May. 05, 1988
Applicant:
Inventor:
Cornelis M Van Uijen, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 48 ;
Abstract
A method and device are disclosed for recording information represented by a code signal Vd on an optically readable record carrier (1) by means of optically detectable recording marks (8). Outside the areas (30) of the record carrier (1) which are used for recording the information signal reference marks (33) are formed. When the record carrier is read a detection signal Vd is generated, from which the code signal is derived by comparison of the detection signal Vd with a decision level Vref. The decision level Vref is derived from those portions (34) of the detection signal Vd which are representative of the reference marks (33).