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:
Sep. 09, 1986
Filed:
Oct. 02, 1985
Applicant:
Inventor:
John S Winslow, Altadena, CA (US);
Assignee:
Discovision Associates, Costa Mesa, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G01D / ;
U.S. Cl.
CPC ...
369 54 ; 350172 ; 350397 ; 346 / ; 369 58 ; 369111 ;
Abstract
Apparatus and method for monitoring the optical recording of information on an information storage member using a first beam of light for writing the information and a second beam of light for reading the information. Both the writing beam and the reading beam are focused on the storage member by a single objective lens. The input information signal which is used for modulating the writing beam is also directed to a delaying circuit, and the delayed information signal is compared with the playback signal derived from the reading beam.