Ricoh Company, Ltd.

Miku Mizutani

Makoto Harigaya

Hiroshi Miura

Yoshiyuki Kageyama

Hajime Yuzurihara

Eiko Hibino

Kazunori Ito

Hiroko Ohkura

Hiroshi Deguchi

Michiaki Shinotsuka

Masaru Shinkai

Mikiko Abe

Hiroyuki Iwasa

Hiroko Tashiro

Hiroko Okura

An optical recording medium which comprises a substrate and a recording layer disposed on the substrate, in which the recording layer comprises Ga and Sb, a content of the Sb is 80 atm % to 95 atm % relative to a total content of the Ga and the Sb in the recording layer, and recording and erasing are carried out by a reversible phase change between an amorphous phase and a crystalline phase in the recording layer.

Optical recording medium, process for manufacturing the same, sputtering target for manufacturing the same, and optical recording process using the same

An information recording method including irradiating a phase change recording layer of an optical recording medium with either a multi-pulse laser light train having a recording power of Pw or laser light having an erasing power Pe to record a mark having a length nT in the recording layer, wherein n is an integer of from 3 to 14 and T represents a clock cycle, wherein the multi-pulse laser light train has a constitution such that a heating pulse and a cooling pulse are alternated and the number of heating pulses and the number of cooling pulses each increases by 1 when n increases by 2, and wherein when n is from 6 to 14, the last heating pulse and last cooling pulse have a pulse width of from 0.5T to 0.9T and from 0.7T to 1.5T, respectively.

Information recording method and optical recording medium therefor

An optical recording medium comprising a recording layer which comprises a phase-change recording material causing a reversible phase change between a crystalline phase and an amorphous phase by irradiation with an electromagnetic wave, wherein the phase-change recording material mainly comprises materials expressed by the composition formula X&agr;Ge&bgr;Mn&ggr;Sb&dgr;Te&egr; with each of the components respectively fulfills 0&lE;&agr;&lE;5, 1&lE;&bgr;&lE;5, 1&lE;&ggr;&lE;10, 65 &lE;&dgr;<80, 15&lE;&egr;&lE;25, and &agr;&lE;&ggr; (where X expresses at least one of Ga and Sn, &agr;, &bgr;, &ggr;, &dgr;, and &egr; expresses atomic percentage, and fulfills &agr;&plus;&bgr;&plus;&ggr;&plus;&dgr;&plus;&egr;&equals;100).

Optical recording medium and recording method

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Kumagaya, Japan

Miku Mizutani