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. 26, 2005
Filed:
May. 12, 2004
Kazunori Ito, Kanagawa, JP;
Michiharu Abe, Kanagawa, JP;
Makoto Harigaya, Kanagawa, JP;
Takashi Shibaguchi, Kanagawa, JP;
Eiko Suzuki, Kanagawa, JP;
Nobuaki Onagi, Kanagawa, JP;
Hiroko Tashiro, Kanagawa, JP;
Yoshiyuki Kageyama, Kanagawa, JP;
Kazunori Ito, Kanagawa, JP;
Michiharu Abe, Kanagawa, JP;
Makoto Harigaya, Kanagawa, JP;
Takashi Shibaguchi, Kanagawa, JP;
Eiko Suzuki, Kanagawa, JP;
Nobuaki Onagi, Kanagawa, JP;
Hiroko Tashiro, Kanagawa, JP;
Yoshiyuki Kageyama, Kanagawa, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
An optical recording medium has a phase-change recording layer containing Sb and Te as essential elements therefor, to which is added at least one element selected from the group consisting of Ag, Au, Cu, Zn, B, Al, Ga, In, Si, Ge, Sn, Pb, N, P, Bi, La, Ce, Gd, and Tb, the recording layer being capable of assuming an amorphous phase changed from a crystalline phase by the application of a laser beam thereto, thereby optically recording information. Recording marks are formed in the recording medium by converting a light emission wave of laser beam into a recording pulse train comprising a plurality of on-pulses and off-pulses, with a recording frequency being continuously changed corresponding to the location of each of the recording marks in the radial direction of said recording medium. A recording apparatus has laser beam driving circuit means, signal generation means, and signal transmission means for achieving the above recording method.