Track access method and apparatus therefor

Details Track access method and apparatus therefor Track access method and apparatus therefor

1996-05-21

1997-10-07

Huber, P. W.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, G11B 700

Patent

active

056755635

ABSTRACT:
A method of track access is provided which, when there is a large offset in the neutral position of a focusing lens, achieves stable tracking servo operation and prevents a slowing down of access time. In this method, when performing an operation which accesses a target track, a focusing lens resilient part external force compensation value, which is the average value of lens actuator drive command values when the lens lock servo is in the on condition, is added to a lens actuator drive command value which is calculated by a digital signal processor (8), this value being the output value with respect to the D/A converter B10, so that even if there is inclination in the optical recording/reproducing apparatus, or deformation or the like in the resilient part that holds the focusing lens, thereby causing a large offset in the neutral position of the focusing lens, it is possible to cancel out external disturbance to control by the external force of resilient part which holds the focusing lens, thereby achieving stable access performance and enabling a shortening in the access time.

REFERENCES:
patent: 4615023 (1986-09-01), Inada et al.
patent: 4764911 (1988-08-01), Morota et al.
patent: 5117410 (1992-05-01), Akiyama
patent: 5177718 (1993-01-01), Takeuchi
patent: 5317550 (1994-05-01), Semba
patent: 5442604 (1995-08-01), Osada

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