Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1988-10-14
1990-06-26
Richardson, Robert L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 43, 360 7303, 360 7806, G11B 2108
Patent
active
049378031
ABSTRACT:
A data reading device for use in a disc player including a pickup device for reading data from a disc, a pickup transfer motor for moving the pickup across the disc in a radial direction in response to a speed control signal, a pickup transfer speed detector for detecting the radial speed of the pickup and generating a speed signal representative of the speed, a target position signal generator for generating a position signal corresponding to a desired radial position on the disc, a microcomputor for calculating the location of the pickup with respect to the disc and generating a location signal corresponding to the location, a comparator for generating a distance signal representing the distance between the location of the pickup and the desired position using the position signal and the location signal, nonlinear attenuator for attenuating the speed signal in a nonlinear manner based upon the value of the speed signal and a pickup drive circuit for generating the speed control signal from the distance signal and the attenuated speed signal and applying the speed control signal to the pickup transfer motor for moving the pickup.
REFERENCES:
patent: 4030132 (1977-06-01), Iftikar et al.
patent: 4321517 (1982-03-01), Touchton et al.
patent: 4677507 (1987-06-01), Elliott
patent: 4748607 (1988-05-01), Nakane
Kabushiki Kaisha Toshiba
Richardson Robert L.
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