Emergency resetting circuit for a semiconductor laser of a laser

Details Emergency resetting circuit for a semiconductor laser of a laser Emergency resetting circuit for a semiconductor laser of a laser

1987-01-05

1988-08-02

Broome, H.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346160, G01D 942

Patent

active

047616610

ABSTRACT:
An emergency reset circuit is provided for interrupting the light output of a modulatable laser of a laser beam printer (LBP) that produces a hard copy of image information by copy-processing a photosensitive surface scanned by the laser when it is supplied with a preset driving current and produces light at a preset level. The laser is operated by a control system that produces a preselected driver voltage that is applied to a laser driver circuit that supplies driving current to the laser. The driver circuit is responsive to the preselected driver voltage for producing said preselected laser driving current whereby the laser to operate at its preset level. The emergency reset circuit includes a latch circuit responsive to an emergency reset signal for zeroing the drive voltage, and an offset circuit for supplying a preselected offset voltage to the laser driver circuit when the driver voltage is zeroed. The offset voltage is of such value as to cause the driving current produced by the laser driver to have a level below the threshold at which the laser emits light.

REFERENCES:
patent: 4649403 (1987-03-01), Miura
Computers & Electronics, "Laserjet Printer", by Josef Bernard, Jul. 1984.

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