Tilt control for reading information

Details Tilt control for reading information Tilt control for reading information

2003-11-04

2009-02-03

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044320, C369S053190, C369S044130, C369S047310

Reexamination Certificate

active

07486602

ABSTRACT:
An apparatus for scanning a track on a record carrier has a head for scanning the track and generating a read signal. The tilt between the head and the record carrier (11) is compensated via a tilt servo loop. Thereto the head is provided with tilt compensating actuators (42). A measure of the tilt is jitter in the read signal generated by a front end (43) and filter (44). A wobble generator (40) provides a wobble signal to the actuators and to an input of multiplier (45) for synchronous detection of the jitter. The output of the multiplier (45) is coupled to a low pass filter (46) for generating a tilt error signal coupled to a tilt controller (47) for generating a tilt control signal.

REFERENCES:
patent: 5001690 (1991-03-01), Kamiya et al.
patent: 5856930 (1999-01-01), Hosono
patent: 6339580 (2002-01-01), Kawashima et al.
patent: 2002/0060964 (2002-05-01), Park
patent: 03242832 (1991-10-01), None
patent: 03242832 (1999-10-01), None
patent: 2001023213 (2001-01-01), None
Translation of Sato, JP 03-242832 A, published Oct. 29, 1991.
ISR for Publication, International Publication No. WO2004/053854.

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