Laser drive circuit for optical disk recording/reproducing

Details Laser drive circuit for optical disk recording/reproducing Laser drive circuit for optical disk recording/reproducing

1991-07-17

1993-08-17

Psitos, Aristotelis

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 250205, 372 29, G11B 700

Patent

active

052375587

ABSTRACT:
A laser driver circuit of an optical disk recording/reproducing apparatus includes a laser output detecting unit for detecting a digital average value of a laser output, first and second memories for storing a digital value of a current to be supplied to a laser diode, first and second D/A converters for converting the digital values stored in the first and second memories into analog values, and a current supplying unit for supplying a current proportional to an output of the first D/A converter or a current proportional to a sum of outputs of the first and second D/A converters to the laser diode.

REFERENCES:
patent: 4685097 (1987-08-01), Van der Put
patent: 4692606 (1987-09-01), Sakai et al.
patent: 4747091 (1988-05-01), Doi
patent: 4785443 (1988-11-01), Minami et al.
patent: 4858219 (1989-08-01), Yoshikawa

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