Paper currency recognition system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 28, 2003
Grant Date -
May 8, 2003
app pub date -
Nov 5, 2001
filing date -
Oct 16, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A paper currency recognition system used in a money exchange machine includes a LED type transmitter unit and a phototransistor type receiver unit controlled by a CPU. The receiver unit also includes an N-channel MOSFET. When a variation in the induction or signal current from the receiver unit is detected, the CPU controls the MOSFET to let a part of the induction current be shunt to the MOSFET, enabling the value of the induction current to be regulated to a readable range, and at the same time drives a control chip of the receiver unit to regulate the LED driving current, keeping the light intensity of the LED within a constant value.
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