High-speed search method for use in a disc player system

Details High-speed search method for use in a disc player system High-speed search method for use in a disc player system

1988-09-06

1990-05-15

Richardson, Robert L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4411, 369 57, 360 7806, G11B 700

Patent

active

049264052

ABSTRACT:
A high-speed search method for searching a target address and for use in a disc player system having a slider for positioning a pickup for reading an information signal recorded on a disc as tracks, in a disc radius, and a tracking servo system for causing an information detecting point of the pickup to follow the track. An accelerating-and-decelerating move control mode in which the slider is accelerated and subsequently decelerated with the tracking servo loop open, and a constant speed move control mode in which the slider is moved at a constant speed by using address data obtained from a signal from the pickup are prepared, and a distance from a present position of the pickup to the target address is detected. Operations of the accelerating-and-decelerating move control mode and subsequently the constant speed move control mode are executed and the tracking servo loop is closed when the distance is equal to or greater than a predetermined value, whereas the operation of the constant speed move control mode is executed without executing the operation of the accelerating-and-decelerating move control mode and the tracking servo loop is closed when the distance is smaller than the predetermined value.

REFERENCES:
patent: 4835753 (1989-05-01), Yasuda

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