Apparatus for driving a semiconductor laser for use in a laser-b

Details Apparatus for driving a semiconductor laser for use in a laser-b Apparatus for driving a semiconductor laser for use in a laser-b

1983-06-14

1985-04-23

Tarcza, Thomas H.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358300, G01D 1514

Patent

active

045133000

ABSTRACT:
An apparatus for driving a semiconductor laser for use in a laser-beam printer, in which a laser beam from the laser is deflected so as to scan a light-sensitive drum and a light-sensitive detector placed in the vicinity of one edge of the drum, comprises a first device for determining the operation level for the laser when it scans the drum to record information thereon, a second device for determining the operation level for the laser when it scans the detector to provide a scanning start pulse signal and a controller for controlling the first and second devices so that they are alternately enabled to determine the intensity of the laser beam depending upon whether the drum or the detector is scanned, whereby the intensity of the laser beam is allowed to be adjusted in accordance with the varying light-sensitivity of the drum without fluctuating the instant of generation of the scanning start pulse signal.

REFERENCES:
patent: 4408871 (1983-10-01), Kojima

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