| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk device having a stable and highly accurate actuator control function by using the system constitution for accurately detecting the counter-electromotive voltage even when the temperature change and the external vibration are generated. SOLUTION: This device is composed of an actuator driver, back electromotive voltage detecting circuit including the actuator and an electronic volume, back electromotive voltage feedback circuit, level detecting circuit for back electromotive voltage, D/A converter, temperature sensor, acceleration sensor, adjusting controller, switch, and adder. The counter-electromotive voltage is accurately detected and the actuator is controlled so as to reduce the vibration of an objective lens in such a manner that an element such as the electronic volume having the variable resistance is used and the resistance is quickly and accurately adjusted at the time of inputting the power supply to the device or the time of detecting the temperature change.
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