Optical apparatus for detecting document size for use in a copyi

Details Optical apparatus for detecting document size for use in a copyi Optical apparatus for detecting document size for use in a copyi

1988-09-08

1990-07-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356383, G01N 2186

Patent

active

049393774

ABSTRACT:
In an original document size detecting arrangement, one or more pairs of a light emitting element and a light receiving element are located on both sides of the original document platform so that the detection light emitted from the light emitting element travels to the light receiving element along the top surface of the original document platform spaced therefrom a predetermined value. Since the detection light travels along the surface of the original document platform, when an original document is placed on the platform, the detection light is interrupted by the original document. A detecting element is provided for detecting whether the detection light enters into the light receiving element or whether the detection light is interrupted so that the detecting element can generate a detection signal showing the size of the original document.

REFERENCES:
patent: 4511246 (1985-04-01), Nishiyama
patent: 4571498 (1986-02-01), Hagan et al.
patent: 4614874 (1986-09-01), Fukuda et al.
patent: 4641966 (1987-02-01), Lemmers et al.

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