Seek control system of dual processor magneto-optic disk unit

Details Seek control system of dual processor magneto-optic disk unit Seek control system of dual processor magneto-optic disk unit

1994-06-27

1995-08-22

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 32, 369 4434, G11B 700

Patent

active

054446848

ABSTRACT:
A seek control system is used for a magneto-optic disk unit which has an optical head driven by a VCM positioner, two lens actuators disposed on the optical head, and respective object lenses disposed on the lens actuators for passing first and second beams (erase and write beams) to irradiate an identical track on a medium thereby to record and reproduce data thereto and therefrom. To shorten an access time needed for accessing a target track through a lens seek operation carried out by driving the two lens actuators and to prevent a deviation (off-track) of the second beam from the target track during the VCM positioner seek operation according to the first beam and shorten an access time, upon receiving a seek instruction from a higher device respective, exclusive use processors carry out the lens seek control of the first and second beams, in parallel. The number of tracks respectively crossed the first and second beams are counted so that, when the moving speed of the second beam decreases to a lens seek possible speed at a specified target track due to the positioner seek operation with the first beam, the lens seek operation with the second beam is started.

REFERENCES:
patent: 4845696 (1989-07-01), Ohtsuki et al.
patent: 5086419 (1992-02-01), Yanagi
patent: 5148416 (1992-09-01), Hoshino et al.
patent: 5161137 (1992-11-01), Suzuki
patent: 5163033 (1992-11-01), Yanagi

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