| 摘要 |
PROBLEM TO BE SOLVED: To attain the high speed access even in the case where a noncontact temperature sensor is used and to bring the effectiveness of the non-contact temperature sensor at most by providing an optical output control system (ALPC system). SOLUTION: By the ALPC system 21 which is constituted of both circuits for an optical output detecting system 22 and an optical output control system 23, the optical output of an optical head 2 is controlled in accordance with the information of estimated temperature of a magneto-optical disk D set based on a temperature time constant of the non-contact temperature sensor 36 within the prescribed time right after the magneto-optical disk D is loaded. Then, the optical output of the optical head 2 is controlled specified time later in accordance with the temperature information from the temperature sensor 36. By this procedure, the control of optical output in the transitional period up to the normal state from the time point the magneto-optical disk D is loaded, also becomes stable similarly to the control of optical output in the normal state, and the access of information data is attained from the time right after the magneto-optical disk D is loaded into the device, thereby the access speed is increased. |
