Ricoh Company, Ltd.

Osamu Nonoyama

Makoto Harigaya

Yoshiyuki Kageyama

Hiroko Iwasaki

Yukio Ide

Katsuyuki Yamada

Hiroshi Deguchi

Masaetsu Takahashi

An intensity of light reflected on a phase-changing type of information recording medium is changed since unrecorded and recorded portions of the recording medium have different phase states so that reflectivities of the unrecorded and recorded portions are different from each other. Such an intensity change takes place in a very short time immediately after a recording pulse is irradiated onto the phase-changing type of information recording medium. In a recording and simultaneous verifying method of the phase-changing type of information recording medium, the change in intensity of light reflected on the phase-changing type of information recording medium is detected by using this light reflected simultaneously with a recording pulse irradiated onto the phase-changing type of information recording medium. It is confirmed if the information is correctly recorded by detecting the reflected light. Thus, this information can be recorded to the information recording medium and can be simultaneously verified.

Recording and simultaneous verifying method of phase-changing type of

A light reflecting and heat dissipating material which is capable of reflecting light and dissipating heat transmitted thereto from a layer in contact with or adjacent to the material to cool the layer is composed of an alloy represented by formula (I):

Light reflecting and heat dissipating material and optical information

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Yokohama, Japan

Osamu Nonoyama