Sheet overlapping detecting method

Details Sheet overlapping detecting method Sheet overlapping detecting method

1990-06-13

1993-02-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214R, G01N 904

Patent

active

051855208

ABSTRACT:
A sheet overlapping detecting method includes the following steps. A predetermined level value V.sub.os is set as the level of a light emission signal. On the basis of a value V.sub.ik of a light reception signal obtained upon light reception based on light emission corresponding to a light emission signal having a predetermined level value V.sub.os, an optimum value V.sub.od corresponding to the input value V.sub.k is calculated in accordance with a prestored V.sub.ik -V.sub.od characteristic table. The calculated optimum value V.sub.od is set as the level of the light emission signal to drive the light-emitting device. On the basis of a value V.sub.ik of a corresponding light reception signal, a change value V.sub.1-2 corresponding to the input value V.sub.ik is calculated in accordance with a prestored V.sub.ik -V.sub.1-2 chararcteristic table. A determination level V.sub.L is calculated in accordance with the following equation:

REFERENCES:
patent: 4286149 (1981-08-01), Ben-Nathan

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