Laser beam recording method and apparatus

Details Laser beam recording method and apparatus Laser beam recording method and apparatus

1987-12-23

1989-07-18

Sikes, William L.

Coherent light generators

Particular beam control device

Having particular beam control circuit component

372 24, 372 26, 372 31, 372 38, H01S 313

Patent

active

048499803

ABSTRACT:
A laser beam recording method and apparatus are constituted for recording an image by obtaining a laser beam whose optical intensity is modulated by controlling a drive current for a semiconductor laser on the basis of a light emission level instructing signal corresponding to an image signal, and scanning the laser beam on a photosensitive material. The optical output is stabilized by detecting the optical intensity of the laser beam and feeding back a feedback signal corresponding to the detected optical intensity to the light emission level instructing signal. A filter circuit formed so that the gain gradually increases from near to a cutoff frequency of a circuit for the optical output stabilization toward a higher frequency side is disposed in a stage prior to the circuit for the optical output stabilization. Or, a bias current of a value smaller than the value of the drive current that produces the laser beam of the minimum optical intensity capable of exciting the photosensitive material is always fed to the semiconductor laser.

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