The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 2003
Filed:
Nov. 05, 2001
Applicant:
Inventor:
Hung-Ta Chen, Taipei, TW;
Assignee:
International Currency Technologies Corporation, Taipei, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J 1/32 ;
U.S. Cl.
CPC ...
G01J 1/32 ;
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.