Registers – Coded record sensors – Particular sensor structure
Patent
1977-02-07
1978-10-31
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
250569, G06K 710, G08C 906
Patent
active
041229975
ABSTRACT:
A bundle of illuminating optical fibers conveys light from a light source to an area on a document in which a mark may be present or absent. A bundle of reading optical fibers conveys light reflected from the area to a light sensor. The amount of conveyed light is less when the mark is present than when the mark is absent so that the light sensor may determine whether the mark is present. The optical axes of the optical fibers are perpendicular to the document at the ends thereof facing the document. The width of the reading optical fiber bundle and the distance of the reading optical fiber bundle from the illuminating optical fiber bundle are selected to provide maximum contrast between marks and the background of the document so that glossy marks made by pencil as well as non-glossy marks made by felt-tip pen or the like can be reliably read.
REFERENCES:
patent: 3566083 (1971-02-01), McMillin
patent: 3671722 (1972-06-01), Christie
patent: 3737629 (1973-06-01), See
patent: 3763352 (1973-10-01), Del Rio et al.
patent: 3985999 (1976-10-01), Yoneyama
Cook Daryl W.
Jordan Frank J.
Ricoh & Company, Ltd.
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