Optical readout circuit for producing waveforms having sharp edg

Details Optical readout circuit for producing waveforms having sharp edg Optical readout circuit for producing waveforms having sharp edg

1988-10-20

1991-05-07

McElheny, Jr., Donald

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369124, G11B 700

Patent

active

050142577

ABSTRACT:
An optical reading apparatus comprises a photodetector having equally divided first, second, third and fourth segments which are arranged in the path of light reflected from an optical recording medium. The first and second segments are aligned in a direction parallel to the track on the medium and the third and fourth segments are aligned in a direction perpendicular to the track. A readout circuit is provided for deriving an output A.multidot.a+B.multidot.b from the outputs of the first, second, third and fourth segments, where A and B represent constants, a represents a summed value of the outputs of the first, and second, third and fourth segments and b represents a summed value of the outputs of the first and second segments.

REFERENCES:
patent: 4520469 (1985-05-01), Todokoro et al.
patent: 4525825 (1985-06-01), Ito et al.
patent: 4603410 (1986-07-01), Yoshida
patent: 4689778 (1987-08-01), Miura et al.
patent: 4744069 (1988-05-01), Sugiyama et al.

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