LED array with graduated quantity control

Details LED array with graduated quantity control LED array with graduated quantity control

1988-03-11

1989-08-08

Goldberg, E. A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358296, 358456, 346107R, G01D 942

Patent

active

048557609

ABSTRACT:
An image forming method and apparatus characterized in that current supply periods of time to light-emitting diodes constituting a light-emitting diode arrays are controlled corresponding to gradation levels while a constant current is being supplied to the light-emitting diodes, and in that the current supply period of time is adjusted at every gradation level corresponding to the variations in light intensity of the light-emitting diodes when the constant current is supplied to thereby correct for the variations in output light intensities of the light-emitting diodes.

REFERENCES:
patent: 4750010 (1988-06-01), Ayers
patent: 4757327 (1988-07-01), Henzi

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