Disc player having pick-up tilt servo system combined with disc

Details Disc player having pick-up tilt servo system combined with disc Disc player having pick-up tilt servo system combined with disc

1985-01-29

1987-07-14

Cardillo, Raymond F.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369 58, G11B 700

Patent

active

046807446

ABSTRACT:
A recorded data playback apparatus for reproduction of data from recording discs, of the type in which a light beam (e.g. from a laser) is used in performing data readout from the disc, is provided with a servo system for detecting and correcting any deviations from a mutually perpendicular relationship between the axis of the data sensing light beam and the surface of the recording disc on which the light beam is incident, by varying a degree of tilt of that light beam, and a device for sensing the presence or absence of a recording disc mounted on the apparatus and for opening the servo loop when it is detected that no disc is present. When this is done, the tilt control device of the servo system becomes held in the condition which existed immediately prior to the absence of a recording disc being detected, thereby preventing servo loop runaway.

REFERENCES:
patent: 4032971 (1977-06-01), Camerik
patent: 4239942 (1980-12-01), Van Alen et al.
patent: 4340950 (1982-07-01), Kosaka
patent: 4499571 (1985-02-01), Yokota
patent: 4541084 (1985-09-01), Oku et al.
patent: 4574372 (1986-03-01), d'Alayer de Costemore d'Arc

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