Optical recording/reproducing apparatus having laser diode drive

Details Optical recording/reproducing apparatus having laser diode drive Optical recording/reproducing apparatus having laser diode drive

1995-06-20

1999-01-12

Bovernick, Rodney B.

Coherent light generators

Particular component circuitry

Optical pumping

372 29, 372 31, H01S 310

Patent

active

058598626

ABSTRACT:
An optical recording/reproducing apparatus has a laser diode and a semiconductor integrated circuit device for driving the laser diode. The semiconductor integrated circuit device has a driver circuit for producing a drive current to be supplied to a laser diode in accordance with an input signal representative of a laser beam power varying depending on a relative speed between a magneto-optical disk and a spot of a laser beam emitted by the laser diode on the optical disk. The driver circuit has a non-linear first operation range and a substantially linear second operation range subsequent to the first operation range. For a linear operation of the driver circuit, a level shifter circuit is connected to the driver circuit for applying a shift voltage to the driver circuit with a result that an excess output current is produced by the driver circuit even when the input signal is non-existent. To prevent supply of the excess output current to the laser diode, a current suppressing circuit is provided for supplying a suppression current to the driver circuit.

REFERENCES:
patent: 3504302 (1970-03-01), Fenner
patent: 5097473 (1992-03-01), Taguchi
patent: 5579329 (1996-11-01), Taguchi
Nikkei Electronics, Feb. 8, 1988, No. 440, pp. 115-142.

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