Digital LED printer with improved data flow and control

Details Digital LED printer with improved data flow and control Digital LED printer with improved data flow and control

1996-07-01

1999-06-29

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347240, B41J 247, B41J 2435

Patent

active

059175354

ABSTRACT:
A digital LED printer having a printbar control architecture that enables multi-exposure levels and multiple gray levels for a LED printbar. Alight emitting diode printbar is aligned in an image exposure relationship with a photoreceptor. Video data signal comprised of multiple bits for each pixel are applied to a register/latch. The individual bits of the latched multiple bits for a pixel are applied to AND gates. Those signals are ANDed with multiple strobe line signals that are related to the status of the printer. The outputs of the AND operation are applied to an OR gate. The output of the OR gate is used to control the illumination from a light emitting diode. Beneficially, the characteristics of the light emitting diode are measured and stored such that the current applied to the light emitting diode can be adjusted such that the illumination from the light emitting diode is at a predetermined value.

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