Information device and method for performing information processing
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsTakashi Mihara, Shigeru Furumiya
Life of this patent
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Abstract
The present application discloses an information device for performing optical information processes for a recording medium including a phase-change recording layer which becomes amorphous under irradiation with pulsed amorphization light that has prescribed amorphization energy Ew. The information device includes an irradiator configured to irradiate a prescribed region of the phase-change recording layer with pulsed light and an energy setting portion which sets crystallization energy Ee for the pulsed light to crystallize the prescribed region. The crystallization energy Ee per the pulsed light, which is set by the energy setting portion, is greater than the amorphization energy Ew per the pulsed amorphization light.
Claims15
An information device for performing optical information processes for a recording medium including a phase-change recording layer which becomes amorphous under irradiation with pulsed amorphization light which has prescribed amorphization energy Ew, comprising:
- an irradiator configured to irradiate a prescribed region of the phase-change recording layer with pulsed light, the prescribed region having temperature characteristics defined by a crystallization temperature Tx and a melting point Tm;
- and
- an energy setting portion which sets crystallization energy Ee for the pulsed light to crystallize the prescribed region,
- wherein the crystallization energy Ee per the pulsed light, which is set by the energy setting portion, is greater than the amorphization energy Ew per the pulsed amorphization light,
- wherein a shortest interval which is required to crystallize the prescribed region in a temperature range that is no lower than the crystallization temperature Tx and no higher than the melting point Tm is an interval tc,
- wherein the irradiator selectively irradiates the prescribed region with one of pulsed crystallization light having the crystallization energy Ee and the pulsed amorphization light having the amorphization energy Ew as the pulsed light, and
- wherein a pulse width dT1 of the pulsed crystallization light, which is set by the energy setting portion, is shorter than the interval tc.
A method for performing optical information processes for a recording medium including a phase-change recording layer which becomes amorphous under irradiation with pulsed amorphization light which has prescribed amorphization energy Ew, comprising:
- a setting step of setting crystallization energy Ee for pulsed light to be irradiated onto a prescribed region of the phase-change recording layer in order to crystallize the prescribed region, the prescribed region having temperature characteristics defined by a crystallization temperature Tx and a melting point Tm;
- and
- an irradiation step of irradiating the prescribed region with the pulsed light having the crystallization energy Ee,
- wherein a shortest interval which is required to crystallize the prescribed region in a temperature range that is no lower than the crystallization temperature Tx and no higher than the melting point Tm is an interval tc,
- wherein the setting step includes a step of setting the crystallization energy Ee per the pulsed light to be greater than the amorphization energy Ew per the pulsed amorphization light,
- wherein the irradiation step includes a step of selectively irradiating the prescribed region with one of pulsed crystallization light having the crystallization energy Ee and the pulsed amorphization light having the amorphization energy Ew as the pulsed light, and
- wherein a pulse width dT1 of the pulsed crystallization light, which is set by the setting step, is shorter than the interval tc.
Dependencies are inferred from the claim text.