Modulated beam scanning with pixal exposure control

Details Modulated beam scanning with pixal exposure control Modulated beam scanning with pixal exposure control

1989-05-08

1991-02-12

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358298, H04N 121

Patent

active

049928040

ABSTRACT:
Apparatus for modulating a radiation beam during relative scanning movement between the beam and the record medium. The apparatus comprises a beam modulator which is operable to modulate the power level of the beam in accordance with a binary control signal so as selectively to expose the record medium in use to record and image on the record medium. Each bit of the control signals corresponds to a respective output pixel of the image. An exposure control system determines, prior to the modulation step, the pattern of control signal bits corresponding to image pixel in an area containing the pixels to be exposed, and causes the modulator to modulate the radiation beam to take up an output power level corresponding to the determined pattern during exposure of that pixel.

REFERENCES:
patent: 3029387 (1962-04-01), Moe
patent: 4491875 (1985-01-01), Kawamura
patent: 4541116 (1985-09-01), Lougheed
patent: 4661859 (1987-04-01), Mailloux et al.
"Laser-Scanning Parameters and Latitudes in Laser Xerogography", by Sonnenberg, Applied Optics, vol. 21, No. 10, pp. 1745-1751.
"Pre-Processing Techinques for Digital Facsimile", David Ting et al., Conference Record, 1978 International Conference on Communications, vol. 3, Toronto, Canada, Jun. 4-7, 1978.

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