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:
Jan. 01, 1985
Filed:
Oct. 25, 1983
Applicant:
Inventor:
Claude Tinet, Paris, FR;
Assignee:
Thomson-CSF, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
364 46 ; 369 44 ; 369109 ; 369111 ; 369275 ;
Abstract
A record system for reproducing information recorded on a record. Information is recorded on a track of the record in the form of an embossed print made of diffractive elements representing the time variation of a pulse modulated waveform. The diffractive elements have a width on the order of the wavelength of a readout light beam. An optical beam readout device provides the concentrated read-out beam and senses a spatial variation in the diffractive energy emerging from an illuminated portion of the track.