Control apparatus of laser diode

Details Control apparatus of laser diode Control apparatus of laser diode

1992-05-11

1994-01-04

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 99, 372 38, 250205, G11B 700, G11B 7125

Patent

active

052766713

ABSTRACT:
A laser diode having a cathode connected to the ground side of a positive power source and an anode connected to the plus voltage side of the power source through a control circuit. A maximum current to drive the laser diode is supplied to the laser diode by a disgorging type constant current source. In a reading mode operated at a frequency one or more digit higher than a frequency for writing data, a differential current between the write current and a read current is sucked from the disgorging type constant current source by a sucking type constant current source, thereby allowing the read current to flow into the diode. In a writing mode, a current switch connects the sucking type current source according to write data. The disgorging type current source and the sucking type current source are connected to a photodiode by a current switch. An APC responds to the photodiode which detects a read power, thereby reducing a laser fluctuation created from temperature change.

REFERENCES:
patent: 4685097 (1987-08-01), van der Put
patent: 5119360 (1992-06-01), Minakuchi
patent: 5189650 (1993-02-01), Watanabe et al.
patent: 5197059 (1993-03-01), Minami et al.

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