Light sensor apparatus for sheet transport

Details Light sensor apparatus for sheet transport Light sensor apparatus for sheet transport

1990-03-27

1991-04-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, G01N 2186

Patent

active

050067206

ABSTRACT:
A light sensor device along a sheet transport track, having light emitting and sensing means in one of the track's two spaced apart walls, for emitting light energy and sensing the light energy reflected back from a sheet interposed between the walls and in the path of the emitted light energy. The sensor device also includes light absorbing means in the other wall of the track for absorbing the light energy emitted from the light emitting and sensing means when the sheet is not interposed between the light emitting and sensing means. The light absorbing means includes a transparent cylindrical member having a polished end surface for receiving the emitted light energy, the cylinder's other end surface and the cylinder's cylindrical surface being light energy absorbent.

REFERENCES:
patent: 4501480 (1985-02-01), Matsui et al.
patent: 4597665 (1986-07-01), Galbraith et al.
patent: 4875769 (1989-10-01), Linebarger

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