JP3540684B2

JP3540684B2 - Judgment method for paper sheets

Info

Publication number: JP3540684B2
Application number: JP27118299A
Authority: JP
Inventors: 修中野
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1999-09-24
Filing date: 1999-09-24
Publication date: 2004-07-07
Anticipated expiration: 2019-09-24
Also published as: JP2001093017A

Description

【０００１】
【発明の属する技術分野】
この発明は、紙幣、有価証券等の紙葉類の真偽判定方法に関する。
【０００２】
【従来の技術】
紙幣の真偽判定方法として、検査対象紙幣を走査させながら、所定位置に配された磁気センサ、光センサ等の特徴量検出用センサによって、検査対象紙幣の特徴量をその走査方向にわたってサンプリングし、得られたサンプリングデータと予め作成した基準データとのマッチング度を算出することにより、検査対象紙幣の真偽判定を行う方法が知られている。
【０００３】
しかしながら、ユーザによって手動で検査対象紙幣を走査させるような検査装置では、紙幣の搬送速度が予め定められた基準速度とならない場合がある。また、搬送装置によって自動的に検査対象紙幣を走査させるような検査装置であっても、搬送装置の劣化等によって紙幣の搬送速度が予め定められた基準速度とならない場合がある。
【０００４】
図６において、１は矢印の方向に走査される検査対象紙幣を、Ｌは特徴量検出用センサによって特徴量を検出する走査ラインを示している。
【０００５】
図６（ａ）は、検査対象紙幣の搬送速度（走査速度）が基準速度である場合の特徴量検出用センサの特徴量検出信号波形を、図６（ｂ）は、検査対象紙幣の搬送速度（走査速度）が基準速度より速い場合の特徴量検出用センサの特徴量検出信号波形を、図６（ｃ）は、検査対象紙幣の搬送速度（走査速度）が基準速度より遅い場合の特徴量検出用センサの特徴量検出信号波形を、図６（ｄ）は、検査対象紙幣の搬送速度（走査速度）が途中で変化した場合の特徴量検出用センサの特徴量検出信号波形をそれぞれ示している。
【０００６】
従来においては、紙幣の搬送速度（走査速度）が基準速度である場合を想定して基準データを作成している。このため、紙幣の搬送速度が基準速度と異なる速度になった場合には、特徴量検出用センサの特徴量検出信号波形と基準データとのマッチング度が低くなってしまう。そこで、搬送速度による特徴量検出用センサの特徴量検出信号波形の違いを許容するためには、判定基準を甘くする必要があった。そうすると、精度の高い真偽判定を行うことができなくなる。
【０００７】
【発明が解決しようとする課題】
この発明は、検査対象の紙葉類の走査速度が基準速度と異なっていても、正確な真偽判定が行えるようになる紙葉類の真偽判定方法を提供することを目的とする。
【０００８】
【課題を解決するための手段】
この発明による第１の紙葉類の真偽判定方法は、本物の紙葉類を走査させながら複数の特徴量検出用センサによって紙葉類の特徴量を検出させた場合において、１つの特徴量検出用センサによる特徴量検出値が所定値以上になったときに、他の全ての特徴量検出用センサによる特徴量検出値が所定値以上となるように、これらの特徴量検出用センサを配置しておき、検査対象の紙葉類を走査させながら、上記のように配置された各特徴量検出用センサによって検査対象の紙葉類の特徴量を検出させ、全ての特徴量検出用センサによる特徴量検出値が同時に所定値以上となれば、当該検査対象の紙葉類を本物であると判定することを特徴とする。
【０００９】
この発明による第２の紙葉類の真偽判定方法は、本物の紙葉類を走査させながら複数の特徴量検出用センサによって紙葉類の特徴量を検出させた場合において、所定の第１の特徴量検出用センサによる特徴量検出値が所定値以上になるタイミングのうち、所定番目のタイミングにおいて、他の全ての特徴量検出用センサによる特徴量検出値が所定値以上となるように、これらの特徴量検出用センサを配置しておき、検査対象の紙葉類を走査させながら、上記のように配置された各特徴量検出用センサによって検査対象の紙葉類の特徴量を検出させ、上記第１の特徴量検出用センサによる特徴量検出値が所定値以上になるタイミングのうち、上記所定番目のタイミングにおいて、他の全ての特徴量検出用センサによる特徴量検出値が同時に所定値以上となれば、当該検査対象の紙葉類を本物であると判定することを特徴とする。
【００１０】
【発明の実施の形態】
以下、図面を参照して、この発明の実施の形態について説明する。
【００１１】
図１および図２は、検査対象紙幣および検査対象紙幣の特徴量を読み取るためのセンサを示している。
【００１２】
この例では、説明の便宜上、特徴量検出用センサは２つとし、かつそれらのセンサは検査対象紙幣の幅中央位置の特徴量を検出するように配置されている場合について説明する。
【００１３】
検査対象紙幣１は、図示しない検査装置に投入され、矢印の方向に搬送されるものとする。検査装置の所定位置に、２つの特徴量検出用センサ１１、１２が設けられている。各センサ１１、１２としては、たとえば、投光器１１ａ、１２ａと、受光器１１ｂ、１２ｂとからなる光透過型センサが用いられている。光透過型センサ１１ａ、１１ｂは、検査対象紙幣１におけるラインＬに沿って、検査対象紙幣１の特徴量（光透過率）を検出する。
【００１４】
特徴量検出用センサ１１、１２は、本物の紙幣を走査させながら本物の紙幣の特徴量を検出させた場合において、一方の特徴量検出用センサ（以下、第１センサという）１１の特徴量検出信号波形がピークになったときに、他方の特徴量検出用センサ（以下、第２センサという）１２による特徴量検出信号波形がピークとなるように配置されている。
【００１５】
この例では、第１センサ１１の特徴量検出信号波形の３番目のピークが現れたときに、第２センサ１２による特徴量検出信号波形がピークとなるように配置されている。この例では、第１センサ１１と第２センタとの走査方向間隔がｄに設定されている。
【００１６】
図３は、真偽判定処理手順を示している。
【００１７】
まず、被検査紙幣１を走査させることにより、各センサ１１、１２により、ラインＬに沿って特徴量（光透過率）を検出する（ステップ１）。
【００１８】
図４は、検査対象紙幣の搬送速度が基準速度である場合の第１センサ１１の特徴量検出信号波形と、第２センサ１２の特徴量検出信号波形とを示している。
【００１９】
両センサ１１、１２の特徴量検出信号波形に基づいて、第１センサ１１の特徴量検出信号波形の３番目のピークが検出されたときに、第２センサ１２の特徴量検出信号波形がピークであるか否かを判定する（ステップ２）。
【００２０】
第１センサ１１の特徴量検出信号波形の３番目のピークが現れたときに、第２センサ１２の特徴量検出信号波形がピークであると判定した場合には、当該検査対象紙幣を本物であると判定する（ステップ３）。
【００２１】
第１センサ１１の特徴量検出信号波形の３番目のピークが現れたときに、第２センサ１２の特徴量検出信号波形がピークでないと判定した場合には、当該検査対象紙幣を偽物であると判定する（ステップ４）。
【００２２】
図５は、図４と同じ紙幣を検査対象紙幣として用い、検査対象紙幣の搬送速度が途中で変化した場合の第１センサ１１の特徴量検出信号波形と、第２センサ１２の特徴量検出信号波形とを示している。
【００２３】
第１センサ１１の特徴量検出信号波形のピークの間隔および第２センサ１２による特徴量検出信号波形のピーク間隔は、図４の第１センサ１１の特徴量検出信号波形のピークの間隔および第２センサ１２の特徴量検出信号波形のピーク間隔とそれぞれ異なっているが、第１センサ１１の特徴量検出信号波形の３番目のピークが現れたときに、第２センサ１２の特徴量検出信号波形がピークとなることには変わりがない。
【００２４】
したがって、上記のような真偽判定方法によれば、検査対象紙幣が本物である場合には、検査対象紙幣の搬送速度が基準速度と異なっている場合にも、第１センサ１１の特徴量検出信号波形の３番目のピークが現れたときに、第２センサ１２の特徴量検出信号波形がピークとなるので、正確な真偽判定を行うことができる。
【００２５】
特徴量検出用センサとしては光透過型センサが用いられているが、光反射型センサ、磁気センサ等の他のセンサを用いることができる。また、特徴量検出用センサは、２個設けられているが３個以上設けてもよい。さらに、複数の特徴量検出用センサを、紙幣の走査方向に一直線状に配置する必要はない。
【００２６】
ただし、本物の紙幣を走査させながらこれらの複数の特徴量検出用センサによって紙幣の特徴量を検出させた場合において、１つの特徴量検出用センサによる特徴量検出信号波形がピークになったときに、他の全ての特徴量検出用センサによる特徴量検出信号波形がピークとなるようにこれらの特徴量検出用センサを配置しておく必要がある。
【００２７】
【発明の効果】
この発明によれば、検査対象の紙葉類の走査速度が基準速度と異なっていても、正確な真偽判定が行えるようになる。
【図面の簡単な説明】
【図１】検査対象紙幣および検査対象紙幣の特徴量を読み取るためのセンサを示す側面図である。
【図２】図１の平面図である。
【図３】紙幣の真偽判定処理手順を示すフローチャートである。
【図４】検査対象紙幣の搬送速度が基準速度である場合の第１センサの特徴量検出信号波形と、第２センサの特徴量検出信号波形とを示すタイムチャートである。
【図５】図４と同じ紙幣を検査対象紙幣として用い、検査対象紙幣の搬送速度が途中で変化した場合の第１センサの特徴量検出信号波形と、第２センサの特徴量検出信号波形とを示すタイムチャートである。
【図６】検査対象紙幣の搬送速度が基準速度である場合、基準速度と異なる場合の、特徴量検出用センサの特徴量検出信号波形を示すタイムチャートである。
【符号の説明】
１１、１２特徴量検出用センサ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for determining the authenticity of paper sheets such as banknotes and securities.
[0002]
[Prior art]
As a method of determining the authenticity of a banknote, while scanning the banknote to be inspected, a magnetic sensor arranged at a predetermined position, by a sensor for detecting a characteristic amount such as an optical sensor, sampling the characteristic amount of the banknote to be inspected in the scanning direction, There is known a method of calculating the degree of matching between the obtained sampling data and reference data created in advance to determine whether the bill to be inspected is authentic.
[0003]
However, in an inspection apparatus in which a user manually scans a banknote to be inspected, the transport speed of the banknote may not be a predetermined reference speed. Further, even in an inspection device that automatically scans a banknote to be inspected by a transport device, the transport speed of the banknote may not reach a predetermined reference speed due to deterioration of the transport device or the like.
[0004]
In FIG. 6, reference numeral 1 denotes a bill to be inspected scanned in the direction of the arrow, and L denotes a scan line for detecting a feature value by a feature value detection sensor.
[0005]
FIG. 6A shows a characteristic amount detection signal waveform of the characteristic amount detection sensor when the transport speed (scanning speed) of the inspection target banknote is the reference speed, and FIG. 6B shows the transport speed of the inspection target banknote. FIG. 6C shows the characteristic amount detection signal waveform of the characteristic amount detection sensor when the (scanning speed) is higher than the reference speed, and FIG. 6C shows the characteristic amount when the transport speed (scanning speed) of the inspection target bill is lower than the reference speed. FIG. 6D shows the characteristic amount detection signal waveform of the detection sensor, and FIG. 6D shows the characteristic amount detection signal waveform of the characteristic amount detection sensor when the transport speed (scanning speed) of the inspection target banknote changes midway. I have.
[0006]
In the related art, the reference data is created on the assumption that the bill conveying speed (scanning speed) is the reference speed. For this reason, when the transport speed of the banknote becomes different from the reference speed, the degree of matching between the characteristic amount detection signal waveform of the characteristic amount detection sensor and the reference data decreases. Therefore, in order to allow a difference in the characteristic amount detection signal waveform of the characteristic amount detection sensor depending on the transport speed, it is necessary to loosen the criterion. Then, it becomes impossible to perform highly accurate truth / false judgment.
[0007]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of judging the authenticity of a paper sheet that enables accurate authenticity judgment even if the scanning speed of the inspection target paper sheet is different from the reference speed.
[0008]
[Means for Solving the Problems]
The first true / false determination method of a sheet according to the present invention is such that when a plurality of feature amount detection sensors detect a feature amount of a sheet while scanning a real sheet, one feature amount is detected. These feature amount detection sensors are arranged so that when the feature amount detection value of the detection sensor becomes equal to or more than a predetermined value, the feature amount detection value of all other feature amount detection sensors becomes equal to or more than the predetermined value. In addition, while scanning the sheet to be inspected, the characteristic amount of the sheet to be inspected is detected by each of the characteristic amount detecting sensors arranged as described above, and all the characteristic amount detecting sensors are used to detect the characteristic amount of the sheet to be inspected. If the characteristic amount detection value simultaneously becomes equal to or more than a predetermined value, the paper sheet to be inspected is determined to be genuine.
[0009]
The second authenticity determination method for a paper sheet according to the present invention is a method for determining whether a plurality of characteristic amount detection sensors detect the characteristic amount of a paper sheet while scanning a real paper sheet. Among the timings at which the characteristic amount detection value of the characteristic amount detection sensor becomes equal to or more than the predetermined value, at a predetermined timing, the characteristic amount detection values by all other characteristic amount detection sensors become equal to or more than the predetermined value, These characteristic amount detection sensors are arranged, and while scanning the inspection target sheet, the characteristic amount of the inspection target sheet is detected by each of the characteristic amount detection sensors arranged as described above. Among the timings at which the characteristic amount detection value of the first characteristic amount detection sensor becomes equal to or more than a predetermined value, the characteristic amount detection values of all the other characteristic amount detection sensors are simultaneously determined at the predetermined timing. If the above, and judging a sheet of the test object to be authentic.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 and FIG. 2 show a sensor for reading the banknote to be inspected and the characteristic amount of the banknote to be inspected.
[0012]
In this example, for convenience of description, a case will be described in which there are two feature amount detection sensors, and these sensors are arranged so as to detect the feature amount at the center of the width of the bill to be inspected.
[0013]
The banknote 1 to be inspected is inserted into an unillustrated inspection device and transported in the direction of the arrow. Two feature amount detection sensors 11 and 12 are provided at predetermined positions of the inspection device. As each of the sensors 11 and 12, for example, a light transmission type sensor including light emitters 11a and 12a and light receivers 11b and 12b is used. The light transmission sensors 11a and 11b detect a characteristic amount (light transmittance) of the inspection target banknote 1 along the line L of the inspection target banknote 1.
[0014]
The characteristic amount detection sensors 11 and 12 detect the characteristic amount of one of the characteristic amount detection sensors (hereinafter, referred to as a first sensor) 11 when detecting the characteristic amount of the real bill while scanning the real bill. When the signal waveform reaches a peak, the characteristic amount detection signal waveform by the other characteristic amount detection sensor (hereinafter, referred to as a second sensor) 12 is arranged to have a peak.
[0015]
In this example, when the third peak of the feature amount detection signal waveform of the first sensor 11 appears, the feature amount detection signal waveform of the second sensor 12 is arranged to have a peak. In this example, the distance between the first sensor 11 and the second center in the scanning direction is set to d.
[0016]
FIG. 3 shows the procedure of the authenticity determination process.
[0017]
First, by scanning the banknote 1 to be inspected, a characteristic amount (light transmittance) is detected along the line L by the sensors 11 and 12 (step 1).
[0018]
FIG. 4 shows a characteristic amount detection signal waveform of the first sensor 11 and a characteristic amount detection signal waveform of the second sensor 12 when the transport speed of the inspection target bill is the reference speed.
[0019]
When the third peak of the characteristic amount detection signal waveform of the first sensor 11 is detected based on the characteristic amount detection signal waveforms of both sensors 11 and 12, the characteristic amount detection signal waveform of the second sensor 12 has a peak. It is determined whether or not there is (step 2).
[0020]
When the third peak of the characteristic amount detection signal waveform of the first sensor 11 appears and the characteristic amount detection signal waveform of the second sensor 12 is determined to be the peak, the banknote to be inspected is genuine. Is determined (step 3).
[0021]
When the third peak of the characteristic amount detection signal waveform of the first sensor 11 appears, and when it is determined that the characteristic amount detection signal waveform of the second sensor 12 is not a peak, the banknote to be inspected is a fake. A determination is made (step 4).
[0022]
FIG. 5 shows the characteristic amount detection signal waveform of the first sensor 11 and the characteristic amount detection signal of the second sensor 12 when the same bill as in FIG. And waveforms.
[0023]
The peak interval of the characteristic amount detection signal waveform of the first sensor 11 and the peak interval of the characteristic amount detection signal waveform of the second sensor 12 correspond to the peak interval and the second interval of the characteristic amount detection signal waveform of the first sensor 11 in FIG. Although the peak interval of the characteristic amount detection signal waveform of the sensor 12 is different from each other, when the third peak of the characteristic amount detection signal waveform of the first sensor 11 appears, the characteristic amount detection signal waveform of the second sensor 12 changes. It will still be a peak.
[0024]
Therefore, according to the authenticity determination method as described above, when the inspection target banknote is genuine, even when the transport speed of the inspection target banknote is different from the reference speed, the feature amount detection of the first sensor 11 is performed. When the third peak of the signal waveform appears, the characteristic amount detection signal waveform of the second sensor 12 becomes a peak, so that an accurate true / false judgment can be made.
[0025]
Although a light transmission type sensor is used as the feature amount detection sensor, other sensors such as a light reflection type sensor and a magnetic sensor can be used. Although two feature amount detection sensors are provided, three or more feature amount detection sensors may be provided. Furthermore, it is not necessary to arrange a plurality of feature amount detecting sensors in a straight line in the bill scanning direction.
[0026]
However, when the feature amount of the bill is detected by the plurality of feature amount detection sensors while scanning the real bill, when the feature amount detection signal waveform by one feature amount detection sensor reaches a peak. It is necessary to arrange these feature amount detection sensors so that the feature amount detection signal waveforms of all other feature amount detection sensors have a peak.
[0027]
【The invention's effect】
According to the present invention, even if the scanning speed of the sheet to be inspected is different from the reference speed, accurate authenticity determination can be performed.
[Brief description of the drawings]
FIG. 1 is a side view showing a banknote to be inspected and a sensor for reading a feature amount of the banknote to be inspected.
FIG. 2 is a plan view of FIG.
FIG. 3 is a flowchart illustrating a procedure of a bill authenticity determination process.
FIG. 4 is a time chart showing a characteristic amount detection signal waveform of the first sensor and a characteristic amount detection signal waveform of the second sensor when the transport speed of the banknote to be inspected is a reference speed.
FIG. 5 shows a characteristic amount detection signal waveform of the first sensor and a characteristic amount detection signal waveform of the second sensor when the same bill as in FIG. 4 is used as the bill to be inspected and the transport speed of the bill to be inspected changes in the middle. It is a time chart which shows.
FIG. 6 is a time chart showing a characteristic amount detection signal waveform of a characteristic amount detection sensor when a transport speed of a banknote to be inspected is a reference speed and is different from the reference speed.
[Explanation of symbols]
11, 12 Feature amount detection sensor

Claims

When a feature value of a sheet is detected by a plurality of feature value detection sensors while scanning a real sheet and a feature value detected by one feature value detection sensor exceeds a predetermined value. These feature amount detection sensors are arranged so that the feature amount detection values obtained by all other feature amount detection sensors are equal to or greater than a predetermined value.
While scanning the inspection target sheet, the characteristic amount of the inspection target sheet is detected by each of the characteristic amount detection sensors arranged as described above, and the characteristic amount detection values of all the characteristic amount detection sensors are detected. Is simultaneously determined to be equal to or more than a predetermined value, a method of determining the authenticity of the sheet to be inspected as authentic.

When a plurality of feature amount detection sensors detect the feature amount of the sheet while scanning the real sheet, the feature amount detection value of the predetermined first feature amount detection sensor becomes equal to or more than a predetermined value. Among these timings, at a predetermined timing, these characteristic amount detection sensors are arranged so that the characteristic amount detection values by all other characteristic amount detection sensors are equal to or more than a predetermined value,
While scanning the sheet to be inspected, the characteristic amount of the sheet to be inspected is detected by each of the characteristic amount detecting sensors arranged as described above, and the characteristic amount by the first characteristic amount detecting sensor is detected. Of the timings at which the detected value becomes equal to or greater than the predetermined value, if the characteristic amount detection values of all the other characteristic amount detection sensors simultaneously become equal to or greater than the predetermined value at the predetermined timing, the paper sheet to be inspected is removed. A method for determining the authenticity of a sheet that is determined to be genuine.