Device for optically reading marked ballots using infrared and r

Details Device for optically reading marked ballots using infrared and r Device for optically reading marked ballots using infrared and r

1991-08-06

1993-09-28

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235454, 235386, 235475, G06K 710

Patent

active

052488721

ABSTRACT:
A read head for optically scanning a ballot on which votes are cast by marking the ballot with a writing instrument within a voting area defined between a pair of spaced-apart timing marks includes infrared emitters illuminating the timing marks and emitters of visible light illuminating the voting area between the marks. The illuminated portions of the ballot are imaged onto three PIN photodiodes place in a line. The outer two PIN photodiodes are effectively apertured to resolve the timing marks and the middle PIN photodiode is effectively apertured to resolve a voting mark of a predetermined minimum size. The ballot, the image and the apertures are carefully aligned such that the photodiodes detect changes in light level associated with an image of a mark passing across the apertures.

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