Document scanning apparatus

Details Document scanning apparatus Document scanning apparatus

1982-11-16

1985-07-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237R, 358213, H01J 4014

Patent

active

045310629

ABSTRACT:
An optical document scanning apparatus of high resolution employs diaphragms defined by a line array of spaced opaque areas which are located midway between an object plane and an image plane containing a line array of spaced light sensors. The object plane is illuminated from a light source located in the image plane parallel to said line array of light sensors. The distance between object and image planes is twice the distance from the lead edge of one light sensor to another and the opaque areas defining the diaphragms are located opposite the areas between light sensors to restrict exposure of the light sensors substantially only to light diffusely reflected from the object plane which is normal to the light sensors thereby to achieve high resolution.

REFERENCES:
patent: 3544713 (1970-12-01), Case et al.
patent: 4430564 (1984-02-01), Fisher

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