Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1993-04-22
1995-05-16
Epps, Georgia Y.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 32, 369 58, 369 4425, G11B 700
Patent
active
054167582
ABSTRACT:
An optical head access controlling apparatus comprises a speed detecting circuit detecting a moving speed of an optical spot irradiated onto an optical disk and outputting a speed detecting signal, a CPU controlling all of said optical head access controlling apparatus and outputting a crossing track number N which is set when access to a target track starts and outputting an access direction, a track counter outputting a remained track number from the crossing track number N to a target track, a reference speed producing circuit producing a reference speed of an optical head in accordance with a remained track number from the track counter, a first amplifier of a gain K1 amplifying a moving speed detecting signal of an optical spot from a speed detecting circuit, a speed direction designating circuit designating a speed direction by an access direction signal of an optical disk from the CPU, a second amplifier of a gain K2 amplifying a reference speed signal from a reference speed producing circuit, a reference speed direction designating circuit designating a reference speed direction by an access direction signal from the CPU, a track pitch distinguishing device for distinguishing a track pitch of an optical disk and an error detecting circuit producing a speed error signal by output from a reference speed direction designating circuit and speed direction designating circuit.
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Epps Georgia Y.
Hindi Nabil
Olympus Optical Co,. Ltd.
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