| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk device having a satisfactory signal quality with a simple constitution. SOLUTION: An objective lens 4 forming a beam spot on the information recording surface of an optical disk 1 is mounted on an objective lens holder 5. A tilt sensor 6 is provided on the holder 5 with the lens 4 arranged side by side. The tilt sensor detects the inclined angle in a radial direction of the objective lens holder 5 with respect to the disk 1 and obtains a signal proportional to the relative inclined angleθ1 formed between the lens holder 5 and a disk recording surface 2 and a signal V1 proportional to the inclined angleθ1 is obtd. by an amplifier 7. A signal V2 proportional to the inclined angleθ2 of a lens actuator with respect to a base is falsely detected by making a detection signal from a current detecting device pass through a filter amplifier 8 imitating the frequency characteristic of the lens actuator. Then, a signal proportional to (θ1 +θ2 )×n-θ2 is calculated in a servo signal computing element 9 and the inclined angle of the lens is controlled so that this value becomes zero.
|
