Optical data reading apparatus having means for detecting data d

Details Optical data reading apparatus having means for detecting data d Optical data reading apparatus having means for detecting data d

1993-09-09

1994-12-20

Chin, Tommy P.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 54, 369 4425, G11B 700

Patent

active

053751108

ABSTRACT:
An optical data reading apparatus for reading data stored in an optical record disc includes an optical pickup head for transducing an optical signal from the optical record disc to an electrical signal, a detector for detecting the level of the electrical signal, a source for supplying a reference signal representative of a minimum acceptable level for the electrical signal, a comparator for continuously comparing the level of the electrical signal and the reference signal and outputting a comparison signal when the level of the electrical signal is less than the reference signal and a warning device responsive to the comparison signal to indicate that the level of the electrical signal is below the minimum acceptable level.

REFERENCES:
patent: 4750163 (1989-05-01), Yamamiya et al.
patent: 4961182 (1990-10-01), Saito et al.
patent: 4991159 (1991-02-01), Tomoda et al.
patent: 5027339 (1991-05-01), Yoda et al.
patent: 5051972 (1991-11-01), Yamamaro

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