G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 7/095 (2006.01)
Patent
CA 1109960
ABSTRACT OF THE DISCLOSURE An apparatus for optically detecting informations recorded on a carrier in which a main light beam for reading out the recorded informations and an additional light beam used for focus servocontrol are respectively incident through a common objective lens on the carrier, the paths of the light beams are subjected to the control by beam path control means, for example, a tracking servocontrol device or a time base correction control device, provided for changing simultaneously these paths through the objective lens in response to a beam path control signal, and an additional focus control device is provided for improving the focus servocontrol operating in cooperation with the additional light beam. With the additional focus control, the position of the objective lens relative to the carrier is shifted in response to the beam path control signal, thereby to compensate for deteriorations in the focussing condition of the main light beam on the carrier resulted from the change of the paths of the main and additional light beams through the objective lens.
286706
Naruse Yohsuke
Okada Hitoshi
Gowling Lafleur Henderson Llp
Sony Corporation
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