Half-tone imaging with flying spot scanner system

Details Half-tone imaging with flying spot scanner system Half-tone imaging with flying spot scanner system

1976-02-23

1977-03-22

Britton, Howard W.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

358285, 358302, G03G 1530

Patent

active

040140300

ABSTRACT:
Half-tone imaging is achieved in a flying spot scanning system wherein a highly collimated light beam is modulated with imaging information, reflected from a multifaceted rotating polygon and directed to a scanned medium through a light attenuating member. The latter member is supported proximate the imaging focal plane and orthogonal to the collimated, reflected light beam. The light attenuating member has an optical light transmission characteristic that varies in a continuous and cyclic pattern with a cycle period at least about ten times the maximum lateral extent of the collimated light beam, thereby serving to alter the system imaging from contrasting black and white patterns to half tones and gray colorations.

REFERENCES:
patent: 3830967 (1974-08-01), Long
patent: 3857635 (1974-12-01), Niehaus

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