Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-09-02
1982-12-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250223R, G01V 904
Patent
active
043651518
ABSTRACT:
Apparatus for detecting the presence of documents in a document pathway employing a light source and a light sensor positioned to function in cooperation with a drum. The drum employs a peripheral surface for support of documents as they are transported across a cylindrical surface which is recessed below the peripheral surface for reflecting light. The positions of the light source and the sensor are selected so that, when no document is present, light from the light source will be reflected from the recessed cylindrical surface onto the sensor enabling the sensor to provide an output indicating no document is present. When a document is present, light from the light source will be reflected from the surface of the document along a path which will substantially miss the sensor and not energize it, thereby enabling associated circuitry to determine that a document is present.
REFERENCES:
patent: 2834450 (1958-05-01), Govin
patent: 3450887 (1969-06-01), Nirenberg
patent: 3709604 (1973-01-01), Niesen et al.
patent: 3737666 (1973-06-01), Dutro
patent: 4207464 (1980-06-01), Fukuyama et al.
Fasig Harold A.
Horak Anthony
Burroughs Corporation
Nelms David C.
Peterson Kevin R.
Quarton Charles E.
Warner Delbert P.
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