Tilt control apparatus based on pulsed width detection of an inf

Details Tilt control apparatus based on pulsed width detection of an inf Tilt control apparatus based on pulsed width detection of an inf

1996-02-20

1998-09-08

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, G11B 7095

Patent

active

058055436

ABSTRACT:
The tilt control apparatus of the invention controls to minimize an error in an orthogonal relationship between an optical disk and an optical axis of a light beam irradiated onto the optical dick. The tilt control apparatus includes: an optical pickup for irradiating the light beam onto the optical disk, thereby reproducing information recorded on the optical disk; an orthogonality error detector for outputting an orthogonality error signal corresponding to the error in the orthogonal relationship between the optical disk and the optical axis; a tilting mechanism for tilting the optical axis; a tilt controller for controlling such that the optical disk falls at right angles with the optical axis by driving the tilting mechanism in response to the orthogonality error signal; a pulse width variation detector for outputting a pulse width variation signal corresponding to a variation in a pulse width of an information reproduced signal obtained from the optical pickup; and a target value variable circuit for varying a control target value of the tilt controller based on the pulse width variation signal.

REFERENCES:
patent: 4674078 (1987-06-01), Otsukka et al.
patent: 5502698 (1996-03-01), Mochizuki

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