Laser diode beam intensity regulation method and apparatus

Details Laser diode beam intensity regulation method and apparatus Laser diode beam intensity regulation method and apparatus

1996-01-11

1998-01-20

Berhane, Adolf

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

359196, 359204, 359205, 250205, 369116, G02B 2608, G01J 132, G11B 700

Patent

active

057105898

ABSTRACT:
A raster output scanner having a laser diode which generates a laser beam with a controlled beam intensity. The raster output scanner includes a time base generator which divides time into a sequence of periods; a laser diode; a current driver which applies laser excitation current to the laser diode in selected pixel periods, wherein the drive current causes the laser diode to generate a laser beam, and wherein the drive current depends upon a control input; a latent image producing surface; and a raster scanner for sweeping a focussed laser beam in scan lines across the latent image producing surface, wherein the time required to complete a scan line is a N pixel periods. The raster output scanner further includes a photosensor which receives a portion of the laser beam and which charges a capacitor with a current which depends upon the laser beam intensity in M pixel periods, wherein the M pixel periods occurs over a time span greater than N pixel periods, a comparator for comparing the voltage on the capacitor after the M pixel periods, and a correction controller for adjusting the control input such that the laser beam intensity is adjusted toward a predetermined value.

REFERENCES:
patent: 4796961 (1989-01-01), Yamada et al.
patent: 4796964 (1989-01-01), Connell et al.
patent: 5233175 (1993-08-01), Latta et al.
patent: 5550668 (1996-08-01), Appel et al.
patent: 5659414 (1997-08-01), Appel et al.

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