Patent ID: 9001632
Filing Date: 2015-04-07
Classification: G11B

Abstract:
1. 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 dT