| 摘要 |
FIELD: physics, computation hardware.SUBSTANCE: invention relates to data write carriers, method and device for data read device and method. Data write carrier comprises three layers of data writing. Laser beam read power on reading data from nlayer of info writing to be counted successively from recording layer located at the maximum distance from data carrier side to be associated with Pw(n). Laser beam read power on reading data from (n+a)one L(n+a) of data writing layers is associated with Pw(n+a), where n+a?0 and a?0. Note here that base depth between every pair of adjacent data writing layers is defined so that light intensity of irradiation of laser beam data writing layer L(n+a) of reading power Pw(n) equals or is smaller than light intensity at irradiation of laser beam writing layer L(n+a) of reading power Pw(n+a).EFFECT: ruled out data damage at random interlayer bump at reading.5 cl, 16 dwg |
