Illumination control for raster input scanners

Details Illumination control for raster input scanners Illumination control for raster input scanners

1981-11-27

1985-01-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237R, 355 71, 358293, H04N 110

Patent

active

044954220

ABSTRACT:
A raster input scanner of the type having a linear array for scanning a relatively moving document line by line, there being lamp means to illuminate at least a line-like portion of the document and optical means to transmit image rays from the document to the array. To provide uniform illumination and obviate illumination degradation due to the effects of cosine 4th law, flare light, lamp fall-off, etc., an apertured mask is provided between the array and the document, the mask aperture uniformly changing in size from a minimum at the array center to a maximum at the array ends. To obviate system M.T.F. degradation, the height of the mask aperture is made less than the width of the array photosites.

REFERENCES:
patent: 3967894 (1976-07-01), Tsilibes
patent: 4090788 (1978-05-01), Massengeil
patent: 4170398 (1979-10-01), Koester
patent: 4288821 (1981-09-01), Lavallee et al.
patent: 4321630 (1982-03-01), Kramer
patent: 4380390 (1983-04-01), Tateoka et al.

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