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. 27, 1989
Filed:
Oct. 22, 1987
Applicant:
Inventor:
Yuzo Ono, Tokyo, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428 64 ; 428 65 ; 428209 ; 428412 ; 428461 ; 428463 ; 428500 ; 428522 ; 428913 ; 428156 ; 428161 ; 428164 ; 428167 ; 369275 ; 369280 ; 369288 ; 369292 ; 430945 ; 346 / ; 3461351 ;
Abstract
An optical storage medium comprises a thermoplastic resin substrate having a concave and convex surface grating on one surface thereof, and a metal layer covering the concave and convex surface grating. The period of the concave and convex surface grating is less than a wavelength of light so that light reflected from the concave and convex surface grating is changed from linear polarization to elliptical polarization, while there is no change in the polarization of light reflected from a recording pit in which the concave and convex surface grating has collapsed. Therefore, information can be read out of the optical storage medium in accordance with the change of light polarization.