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. 23, 1996
Filed:
Jul. 24, 1995
Sony Corporation, Tokyo, JP;
Abstract
An optical recording medium wherein a recording layer capable of optically recording and reproducing the information is formed on a substrate, and wherein the information is recorded with a light beam having a wavelength shorter than that of a replay light beam. A film thickness d of the recording layer is set so as to satisfy the relation d.ltoreq.1.75.lambda./n, where .lambda. is the wavelength of the replay light beam and n is the real part of the complex index of refraction of the recording layer with respect to the replay light beam. The real part of the complex index of refraction of the recording layer with respect to the replay light beam is not less than 2.55, while the absolute value of the imaginary part of the complex index of refraction of the recording layer with respect to the recording light beam is not less than 1.0. The organic dye may be enumerated by a cyanine compound and a porphyrin compound. If the porphyrin compound is used, blue-hued laser recording becomes possible. The optical recording medium is capable of non-destructive reading and superior in reliability and high-speed recording/reproducing characteristics.