Reprographic media detector and methods for making and using

Details Reprographic media detector and methods for making and using Reprographic media detector and methods for making and using

1992-08-07

1993-11-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

271258, G01N 904

Patent

active

052626377

ABSTRACT:
A reprographic media detector having a source of electromagnetic radiation (12) aimed at a reflector (17) is provided. A first detector (13) is positioned near the paper path for detecting electromagnetic radiation reflected from the reflector and a first portion of the paper path. A second detector (14) is positioned near the paper path for detecting electromagnetic radiation reflected from the reflector and a second portion of the paper path. Outputs of the first detector (13) and the second detector (14) are differentially amplified to produce an output signal indicating when an edge of a media sheet is illuminated by the source of electromagnetic radiation (12).

REFERENCES:
patent: 3461302 (1969-08-01), Benson et al.

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