Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1988-05-05
1990-02-06
McElheny, Jr., Donald
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
360 7806, G11B 700, G11B 2108
Patent
active
048993255
ABSTRACT:
A fine access method for an optical disk drive uses a multi-track jump method to cover a wide range of several hundred tracks at a high speed. According to the present invention, one-shot acceleration and deceleration pulses with a short width are sent to an actuator head immediately after every one-half track pitch travel of the actuator head. The actuator head is accelerated when the travel time for one-half track pitch is slower than a first reference time and it is decelerated when the travel time is faster than a second reference time. When the travel time is between the first and second reference times, no pulse is sent to the actuator head. Thus the velocity of the actuator head is compensated and maintained within a specified range of deviation for a whole long range of jumping a plurality of tracks.
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Arai Shigeru
Katsuhara Wataru
Fujitsu Limited
McElheny Jr. Donald
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