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:
Apr. 22, 2003
Filed:
Sep. 24, 2001
Yuji Kuroda, Tokyo, JP;
Yutaka Kasami, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical recording medium is disclosed which incorporates a recording layer made of a phase-change material. The optical recording medium has a structure such that the ratio Ac/Aa of absorptance Ac realized when the recording layer is in a crystal state and absorptance Aa realized when the recording layer is in an amorphous state is 0.9 or higher. Moreover, a crystallization enhancing layer for enhancing crystallization of the phase-change material is formed which is made to contact with at least either surface of the recording layer. Since control of the absorptance and enhancement of crystallization are simultaneously performed, the difference between the physical properties of crystal and those of amorphous can be reliably compensated for. Thus, a satisfactory direct overwriting can be performed even under high speed and dense conditions.