Light signal detecting circuit

Details Light signal detecting circuit Light signal detecting circuit

1991-08-30

1994-03-15

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, 369124, G11B 713

Patent

active

052951294

ABSTRACT:
A light signal detecting circuit which receives via a light detector light radiated from a laser diode oscillated as a multimode by a high frequency driving signal and reflected from an optical disk, amplifies a current signal proportional to the amount of the received light to a light detecting signal and outputs the signal, further includes a phase sensitive detector for selectively outputting from the current signal only a signal component having the same frequency and phase as the high frequency driving signal for driving said laser diode. Accordingly, a signal component with different frequency and phase from the output of laser diode is intercepted, and only a signal component with the same frequency and phase as the output of laser diode is detected.

REFERENCES:
patent: 4460977 (1984-07-01), Shimada et al.

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