Compensation apparatus for radial and vertical runout of an opti

Details Compensation apparatus for radial and vertical runout of an opti Compensation apparatus for radial and vertical runout of an opti

1996-05-03

1998-04-21

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 54, 369 58, G11B 7095

Patent

active

057425736

ABSTRACT:
An apparatus for compensating for radial and vertical runout of an optical disc using an actuator having a lens for focus of a laser beam and wherein the focus and tracking currents control the position of the lens in the vertical and radial directions is disclosed. The apparatus focuses the actuator lens along at least one revolution of a track on an optical disc and producing lens position signals. Structures provided which responds to the lens position signals to produce the frequency content of surface height and track deviations of the optical disc using a frequency transform technique. The surface height and track deviations frequency content are stored and a signal representing the focusing and tracking actuator currents and in response to the focusing and tracking actuator current signals and the stored surface height and track deviation frequencies the lens position is controlled thereby reducing focusing and tracking errors.

REFERENCES:
patent: 3881184 (1975-04-01), Koepcke et al.
patent: 4439848 (1984-03-01), Ceshkovsky et al.
patent: 4764914 (1988-08-01), Estes et al.
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 5121374 (1992-06-01), Barton et al.
patent: 5532990 (1996-07-01), Koyama et al.
patent: 5539714 (1996-07-01), Andrews, Jr. et al.

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