| 摘要 |
PROBLEM TO BE SOLVED: To record an information signal with light beams having lower outputs on an optical disk. SOLUTION: An information signal is recorded on the optical disk by using a light beam of a side whose reflectivity is lower while performing focal position controls of two light beams to be irradiated on the optical disk by irradiating the optical disk with two light beams whose reflectivities at the time irradiating the optical disk are different and by detecting the reflected light from the disk of the light beam of a side whose reflectivity is higher. At this time, it may be performed that right after the information signal is recorded on the disk by the light of the side whose reflectivity is lower, the recorded state is made to be detected by the light beam of the side whose reflectivity is higher. |
