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. 25, 2006
Filed:
Dec. 17, 2003
Hiroshi Shirai, Moriya, JP;
Reiji Tamura, Moriya, JP;
Kazuyo Umezawa, Sagamihara, JP;
Makoto Iimura, Shimotsuma, JP;
Akira Kashiwakura, Moriya, JP;
Kazuyoshi Adachi, Toride, JP;
Hiroshi Shirai, Moriya, JP;
Reiji Tamura, Moriya, JP;
Kazuyo Umezawa, Sagamihara, JP;
Makoto Iimura, Shimotsuma, JP;
Akira Kashiwakura, Moriya, JP;
Kazuyoshi Adachi, Toride, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
A write-once optical information recording medium is provided that is capable of realizing a high transfer rate and a method of recording and reproducing information on and from the optical information recording medium. The optical information recording medium is constructed by stacking a reflective layer, a first dielectric layer, a recording layer, a write-protect layer, a second dielectric layerand a transparent cover layeron a polycarbonate substrate. The recording layeris made of a phase-change material, and the cover layeris made of UV curing resin. The recording layeris irradiated with a laser beam with a wavelength of 500 nm or less to change from a crystalline phase to an amorphous phase. The write-protect layerprevents the recording layerfrom changing back to the crystalline phase from the amorphous phase, formed by the phase change.