Mitsubishi Chemical Corporation

Shuuichi Maeda

Yuki Suzuki

Yutaka Kurose

Michikazu Horie

Takako Kobayashi

Toshifumi Takisawa

Yuko Okamoto

Fujio Matsuishi

Yuko Ohkijima

A high-density optical disk comprises a transparent substrate having a guide groove having a depth of 100 to 200 nm, width of 0.2 to 0.4 &mgr;m arranged with a track pitch of 0.7 to 1.0 &mgr;m. A recording layer is made of an organic pigment exhibiting a specific main weight reduction in a thermogravimetric analysis and a specific exothermic peak in a differential thermal analysis.

Optical recording disk

An optical recording medium having a recording layer containing an organic colorant as the main component, whereby recording is carried out by changing the reflectivity by irradiation of a laser beam for recording having a wavelength of at most 700 nm, wherein when a light having substantially the same wavelength as the laser beam for recording and having an intensity selected from a range of from 1 to 4.5 mW and a pulse length of about 382 nsec, is irradiated while moving a portion to be irradiated of the medium at a relative velocity of 0.3 m/s to the light, the time required for the reflectivity to change and reach a saturated level, is at most 130% of said pulse length.

High density optical recordable medium and method for recording

The present invention relates to a printable optical recording medium comprising: a transparent substrate; and at least a recording layer, a reflective layer and a protective layer, a reflective layer or a protective layer and an ink-receiving layer, which layers are in order superposed on said transparent substrate;

Optical recording medium

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Kanagawa, Japan

Shuuichi Maeda