Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1986-07-15
1988-06-07
Richardson, Robert L.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 44, G11B 700
Patent
active
047501626
ABSTRACT:
In apparatus for optically reproducing information recorded on an optical recording medium, an optical pickup device is arranged such that three light beams obtained by a diffraction grating are focused to apply first to third light spots to the medium so that the center of the second spot is positioned between (N-1).sup.th and Nhu th tracks and the center of the third spot is positioned between N.sup.th and (N+1).sup.th tracks with the center of the first spot being positioned the center of the N.sup.th track. First to third photo detectors are provided to receive reflected beams from the first to third light spots and the output signals thereof are supplied to a circuit for reproducing the information of the N.sup.th track. In the reproducing circuit, after the output signals are synchronized with each other, the output signals of the second and third photo detectors are supplied to an adder and the sum signal is processed by an adjusting circuit so that the amplitude of a signal component of the (N-1).sup.th and (N+1).sup.th tracks becomes equal to that of a signal component thereof obtained by the first detector. A reproduced signal can be obtained by subtracting the processed signal from the output signal of the first detector.
REFERENCES:
patent: 4416002 (1983-11-01), Oguino et al.
patent: 4449212 (1984-05-01), Reno
Richardson Robert L.
Victor Company of Japan Ltd.
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