Multi-level xerography exposure control through multi-beam overs

Details Multi-level xerography exposure control through multi-beam overs Multi-level xerography exposure control through multi-beam overs

1993-12-21

1995-12-05

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347253, B41J 247

Patent

active

054733588

ABSTRACT:
A raster output scanning system is disclosed which utilizes two light beams to double scan two scan lines on a photoreceptor in order to generate three exposure levels required for a tri-level printing system. In the raster output scanner of this invention, the two light beams scan two separate scan lines. At the completion of the simultaneous scanning of two light beams when the first light beam starts to scan a new scan line, the second light beam start to scan the scan line that the first light beam just completed scanning. In this invention the first light beam generates two exposure levels and the second light beam adds additional exposure to the second exposure level in order to generate a third exposure level. The same method can be utilized to generate additional levels for printing systems with more xerographic levels than three.

REFERENCES:
patent: 4027312 (1977-05-01), Schlafer et al.
patent: 4265532 (1981-05-01), McIntosh

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