Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-03-20
1993-11-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, G01N 904
Patent
active
052605647
ABSTRACT:
An apparatus for detecting a sheet in a conveying path, comprising a light source and a light receiver on one side of the conveying path and a light-reflecting element in the form of a prism on the other side of the conveying path for reflecting for the light receiver a beam of light emitted by the light source, wherein the prism has a first reflecting surface opposite the light source, a second reflecting surface opposite the light receiver and a third reflecting surface which deflects, in the direction of the second reflecting surface, the beam of light reflected by the first reflecting surface, so that the apparatus is less sensitive to deviations of the position of the prism with respect to the light source and the light receiver.
REFERENCES:
patent: 1848874 (1932-03-01), Fitzgerald
patent: 2952416 (1960-09-01), Sampson
patent: 3041462 (1962-06-01), Ogle
patent: 3901607 (1975-08-01), Kingsland
IBM Technical Disclosure Bulletin, vol. 22, No. 4, Sep., 1979, New York, New York, U.S.
Patent Abstracts of Japan, vol. 12, No. 121 (M-686) (2968) Apr. 15, 1988 and JP-A 62-249851 (NEC Corp.) Oct. 30, 1987.
Bruggeling Hendrik F. P.
Rutten Hendrik G. J.
Nelms David C.
Oce'-Nederland, B.V.
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