Method and apparatus for candling envelopes

Details Method and apparatus for candling envelopes Method and apparatus for candling envelopes

1990-02-05

1991-07-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250559, 53396, 53503, G01N 904

Patent

active

050361902

ABSTRACT:
A candling system for a mail extraction device incorporates a light source in the form of a light emitting diode and a cooperating photo-transistor detector which operate in the infrared range, to increase the system's immunity to environmental variations, and a linearization circuit for increasing the differentials in voltage which are developed between adjacent density levels (relative to the number of sheets involved), to permit the system to better monitor (distinguish between) envelopes containing an increased number of documents with improved accuracy and efficiency.

REFERENCES:
patent: 4090794 (1978-05-01), Benini
patent: 4124968 (1978-11-01), Stevens et al.
patent: 4139977 (1979-02-01), Russell
patent: 4318180 (1982-03-01), Lundqvist et al.

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