Paper sheets feature detector and paper sheets feature detection method

Abstract

A paper sheets feature detector 20 , through which a banknote 21 is carried and passed is provided with a carrying-in sensor part 22 , a transmissive and reflective line light sensor 23 , a magnetic sensor 24 , a thickness sensor 27 , and a carrying-out sensor part 28 . When a watermark part of the banknote 21 is measured by the line light sensor 23 , a watermark pattern is detected by a light transmissive sensor, and that pattern is not detected by a light reflective sensor, the banknote 21 is determined to be a true banknote. Watermark braille is similarly processed. When the thread is detected by the light transmissive sensor and the thread is not detected by the light reflective sensor, the banknote 21 is determined to be a true banknote.

1 . A paper sheets feature detector comprising at least: 
 a light transmissive sensor for measuring a watermark part of a paper sheet;    a light reflective sensor for measuring the watermark part; and    a determination unit for determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a watermark pattern and a result of measurement by the light reflective sensor shows existence of a blank part.    
   
   
       2 . A paper sheets feature detector comprising at least: 
 a light transmissive sensor for measuring a braille watermark part of a paper sheet;    a light reflective sensor for measuring the braille watermark part; and    a determination unit for determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a watermark braille and a result of measurement by the light reflective sensor shows existence of a blank part.    
   
   
       3 . A paper sheets feature detector comprising at least: 
 a light transmissive sensor for measuring a thread part of a paper sheet;    a light reflective sensor for measuring the thread part; and    a determination unit for determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a thread and a result of measurement by the light reflective sensor does not show existence of the thread.    
   
   
       4 . A paper sheets feature detector comprising at least: 
 a light transmissive sensor for measuring a thread part of a paper sheet;    a thickness sensor for measuring the thread part; and    a determination unit for determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a thread and a result of measurement by the thickness sensor shows existence of the thread.    
   
   
       5 . A paper sheets feature detector comprising at least: 
 a light transmissive sensor for measuring a thread part of a paper sheet;    a magnetic sensor for measuring the thread part; and    a determination unit for determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a thread and a result of measurement by the magnetic sensor shows existence of the thread.    
   
   
       6 . A paper sheets feature detector comprising at least: 
 a light reflective sensor for measuring a peripheral part of a paper sheet; and    a determination unit for determining that when a result of measurement by the reflective sensor shows that ink is adhered to the whole peripheral part of the paper sheet, the ink is theft prevention ink.    
   
   
       7 . A paper sheets feature detection method wherein: 
 measuring a watermark part of a paper sheet by a light transmissive sensor;    measuring the watermark part by a light reflective sensor; and    determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a watermark pattern and a result of measurement by the light reflective sensor shows existence of a blank part.    
   
   
       8 . A paper sheets feature detection method wherein: 
 measuring a braille watermark part of a paper sheet by a light transmissive sensor;    measuring the braille watermark part by a light reflective sensor; and    determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a watermark braille and a result of measurement by the light reflective sensor shows existence of a blank part.    
   
   
       9 . A paper sheets feature detection method wherein: 
 measuring a thread part of a paper sheet by a light transmissive sensor;    measuring the thread part by a light reflective sensor; and    determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a thread and a result of measurement by the light reflective sensor does not show existence of the thread.    
   
   
       10 . A paper sheets feature detection method wherein: 
 measuring a thread part of a paper sheet by a light transmissive sensor;    measuring the thread part by a thickness sensor; and    determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a thread and a result of measurement by the thickness sensor shows existence of the thread.    
   
   
       11 . A paper sheets feature detection method wherein: 
 measuring a thread part of a paper sheet by a light transmissive sensor;    measuring the thread part by a magnetic sensor; and    determining that the paper sheet is a true paper sheet only when a result of measurement by the light transmissive sensor shows existence of a thread and a result of measurement by the magnetic sensor shows existence of the thread.    
   
   
       12 . A paper sheets feature detection method wherein: 
 measuring a peripheral part of a paper sheet by a light reflective sensor; and    determining that when a result of measurement by the reflective sensor shows that ink is adhered to the whole peripheral part of the paper sheet, the ink is theft prevention ink.