JP2006236370A5 - - Google Patents

Claims (4)

A reflective standard piece with a white surface is placed on the banknote conveyance path of the banknote identification device, and the reflective standard piece is irradiated with light from a light source for irradiating the inspection surface of the banknote conveyed along the conveyance path. And adjusting the light amount of the light source so that the level of the electrical signal output by the light receiving unit that receives the reflected light from the reflective standard piece is a predetermined specified level;
In a state where the adjustment is performed, a detection unit having the light source and the light receiving unit scans a plurality of bills conveyed along the conveyance path to detect an output pattern of an electric signal, and detects the detected plurality based on the banknote output pattern, it performs the steps of creating a standard output pattern,
In each bill recognition device ,
In the pre-shipment adjustment stage,
Storing the standard output pattern and the specified level in a storage unit;
A reflective standard strip with a white surface is arranged on the banknote transport path of each banknote identification device, and light is applied to the reflective standard strip from a light source for irradiating the inspection surface of the banknote transported along the transport path. Irradiating and adjusting the light amount of the light source so that the level of the electrical signal output from the light receiving unit receiving the reflected light from the reflective standard piece is the specified level;
Detecting a level of an electrical signal output by a light receiving unit that receives reflected light from a reference reflecting plate disposed on a non-inspected surface side of a bill in the conveyance path in the adjusted light amount;
Storing the level of the detected electrical signal in the storage unit as a reference level ;
In carrying out the identification of the banknote is,
While detecting the level of the electric signal receiving section receives light reflected from the reference reflector and output, the light intensity of the light source such that the detected level is equal to the reference level stored in the storage unit Adjusting steps;
Scanning an inspection surface of a bill conveyed along the conveyance path by a detection unit having the light source and the light receiving unit to detect an output pattern of a bill-specific electrical signal;
A bill identifying method comprising: identifying the bill by comparing the detected output pattern with the standard output pattern stored in the storage unit. The light receiving unit includes a photosensor, an amplifier that amplifies an electric signal output from the photosensor, and an A / D converter that converts an electric signal as an analog signal input from the amplifier into digital data.
The voltage input to the A / D converter when the adjustment is performed so that the level of the electrical signal output from the light receiving unit becomes the specified level does not exceed the input voltage range of the A / D converter. The bill identifying method according to claim 1 , wherein the bill identifying method is set. The step of creating the standard output pattern includes combining the standard output pattern with an average output pattern of the scanned plurality of banknotes and a standard range for determining good in consideration of variations in the output pattern. The bill identifying method according to claim 1 or 2, wherein: When performing the adjustment so that the level of the electrical signal output by the light receiving unit becomes the specified level, instead of adjusting the light amount of the light source, the gain of the light receiving unit is adjusted,
The gain of the light receiving unit is adjusted instead of adjusting the light amount of the light source when performing the adjustment so that the level of the electric signal output from the light receiving unit becomes the reference level. The banknote identification method as described in any one of 1-3 .