Optical disc apparatus with access system having object lens con

Details Optical disc apparatus with access system having object lens con Optical disc apparatus with access system having object lens con

1986-02-13

1988-05-10

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 44, 369 46, G11B 708, G11B 7095

Patent

active

047440694

ABSTRACT:
An optical disc apparatus arranged so that a light beam from a laser light source is focused by an object lens and irradiated on an optical recording medium having thereon a mirror surface and tracks of a plurality of pits for recording data, and that a reflected beam from the recording medium is irradiated on an optical detector from which a signal on the recording medium is reproduced for maintaining a position of said object lens at an optical center axis by a tracking servo. The optical detector includes at least two adjacent photoelectric transducers providing outputs indicative of the reflected beam incident thereon, a device for producing a signal indicative of a difference between the outputs from the transducers, and a position detector for detecting the position of the object lens in a direction perpendicular to the tracks in cooperation with said difference producing device. The position detector includes a sampling arrangement for sampling the difference signal when the light beam is irradiated only on a non-pit portion of said mirror surface. Further, the optical detector includes a feedback loop for positioning the object lens at the optical center axis when the tracking servo is not properly operated at the time of accessing or by external disturbance.

REFERENCES:
patent: 4423496 (1983-12-01), Opheij et al.
patent: 4467462 (1984-08-01), Shibata
patent: 4504937 (1985-03-01), Yonezawa et al.
patent: 4525823 (1985-06-01), Sugiyama et al.
patent: 4563760 (1986-01-01), Maeda et al.
patent: 4613963 (1986-09-01), Hirano
patent: 4615023 (1986-09-01), Inada et al.
patent: 4616354 (1986-10-01), Yoshida

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