| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably initialize each recording layer in an optical recording medium having a plurality of recording layers while stabilizing an initialization condition without having an adverse effect on the other recording layers. <P>SOLUTION: A ring-shaped laser flux 200 is converged on a recording layer L0 of the optical recording medium 10 by an objective lens 4 to initialize a recording material. In that case, since reflected light from a recording layer L1 is dispersed because all the ring-shaped laser flux 200 is made incident on the recording layer L0 obliquely, the adverse effects made by the reflected light on the initialization condition is almost eliminated. In addition, in the case of converging the ring-shaped light flux 200 on the recording layer L1 to perform initialization, an adverse effect is eliminated in a similar manner because heat escapes to the outer and inner sides of the laser flux 200, so that the recording layer L0 can not reach initialization temperature, even though the ring-shaped laser flux 200 passes through the recording layer L0. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
