G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/09 (2006.01)
Patent
CA 1263749
ABSTRACT OF THE DISCLOSURE A focusing control metahod and apparatus employing a photodetector for generating a focusing error signal, a tracking error signal and an RF signal, and a closed loop focusing servo circuit responsive to the focusing error signal applied thereto for focusing a light spot in position on an optical disc. The focusing error signal is detected synchronously with the tracking error signal to produce a first periodic function signal. The focusing error signal is detected synchronously with the RF signal to produce a second periodic function signal. The tracking error signal is converted into a sin-wave signal having a predetermined amplitude. The RF signal is converted into a cos-wave signal having a predetermined amplitude. The first first periodic function signal is multiplied by the cos-wave signal to produce a first component signal. The second periodic function signal is multiplied by the sin-wave signal to produce a second component signal. The first and second component signals are added to produce a composed disturbance signal. The composed disturbance signal is subtracted from the focusing error signal applied to the focusing servo circuit, thereby canceling a disturbance superimposed on the focusing error signal applied to the focusing servo circuit.
524747
Eguchi Naoya
Okada Hitoshi
Sugiki Mikio
Gowling Lafleur Henderson Llp
Sony Corporation
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