Mark sensing detector

Details Mark sensing detector Mark sensing detector

1979-12-28

1981-09-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235462, G06K 714

Patent

active

042887011

ABSTRACT:
Apparatus for sensing marks on a moving paper object includes light source means for transmitting light through a portion of a partially opaque mark and into the translucent fibers of a paper object. Light detecting means are provided for sensing the relative amount of light transmitted into said fibers by detecting the light in said fibers under said mark at an area transversely disposed from the portion of the mark where the light was applied.

REFERENCES:
patent: 3569675 (1971-03-01), Stegeman
patent: 3814944 (1974-06-01), Berger
patent: 4122997 (1978-10-01), Fukuda

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