Hybrid digital image printer with halftone gray scale capability

Details Hybrid digital image printer with halftone gray scale capability Hybrid digital image printer with halftone gray scale capability

1991-11-04

1997-09-23

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

358298, H04N 121

Patent

active

056710038

ABSTRACT:
A gray scale printer is adapted to modulate an exposure source in both amplitude and duration in accordance with an eight-bit data signal. The printer provides for modulating the amplitude of the exposure source in accordance with the six least significant bits of the data signal, and for modulating the duration of the exposure source in accordance with the two most significant bits of the data signal. Amplitude modulation may effect electrical current to the exposure source, and the duration modulation may effect pulse width of electrical current to the exposure source. The exposure source may be, for example, a laser diode or a light-emitting diode array.

REFERENCES:
patent: 4661861 (1987-04-01), Rutherford et al.
patent: 4679057 (1987-07-01), Hamada
patent: 4754291 (1988-06-01), Horikawa
patent: 4965672 (1990-10-01), Duke et al.

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