JPH04158490A - Counterfeit paper money discriminator - Google Patents

Abstract

PURPOSE:To accurately decide truth/falsehood by performing check by plural optical sensors provided with different wavelength >=2. CONSTITUTION:A waveform in figure is the one which a near infrared sensor and a green sensor form by scanning the factors of the irregularities of ink, or a content carbon component, a pigment component, or a metal component, paper quality, the light-and-shade of color, graphic recognition, etc., with the width of irradiation plane >=2mm in the longitudinal direction of an insertion material, and is the one in which the optical signal of the waveform is displayed in voltage. The difference of truth/falsehood can be easy to be detected based on the kind of a paper money by combining two or more optical sensors with different wavelength. Thereby, the check with high accuracy can be performed.

Description

[Detailed description of the invention] 1. Industrial application field] TECHNICAL FIELD The present invention relates to an improvement in a counterfeit bill discriminating device.

'J Full Background of the Invention] Conventionally, counterfeit bill detectors have been attached to the bill slots of vending machines, currency exchange machines, card dispensing machines, etc., and there is a mechanism that automatically checks the bill and determines whether it is accepted or returned. was being driven. - The true true 1 discrimination is to discriminate the magnetism in banknotes, but the reality is that it is relatively easy to pass through the check mechanism for this magnetism discrimination.

Therefore, the applicant of this application focused on the special characteristics of paper printing instead of this magnetism, and created a memory that stores intrinsic data such as unevenness of ink, carbon-based, pigment-based, metallic components, paper quality, color shading, and figure recognition. , developed a mechanism that compares and discriminates data obtained from items inserted through the bill slot,
Furthermore, it has been found that the degree of discrimination can be further improved by detecting waveforms using two or more sensors with different wavelengths and checking for differences from genuine bills.

[Purpose of the Invention] Therefore, the present invention has been made in view of the above-mentioned actual situation, and an object of the present invention is to solve the problems and provide a counterfeit bill discriminating device that can perform checks with higher accuracy.

[Means for Solving the Problems] In order to achieve this object, the counterfeit banknote discriminating device according to the present invention has two or more optical sensors having different wavelengths, and each of them has an irradiation surface of a predetermined width that detects an insert. The waveform scans the longitudinal direction of the insert (the reflectance of the light emitted as the insert travels) and detects factors such as unevenness of the ink, carbon content, pigment content, metal content, paper quality, color shading, and figure recognition. It is characterized by detecting the waveform of the genuine bill and comparing the data with a memory that stores checkpoints of the waveform of the genuine bill in advance to activate the mechanism for accepting and returning the bill.

r effect] With the above configuration, two
Since the waveform is detected by the above-mentioned optical sensors, a wide variety of checks are performed. In particular, the difference between genuine bills and copies becomes clearer, and the degree of discrimination is further improved.

[Example] Next, an example of implementation of the present invention will be described with reference to the drawings.

Figure 1 shows a genuine bill (10
00 yen bill) Waveform diagram when the topsoil is 0.

Figure 2 is a waveform diagram for the same magnetic copy density of 7.9.

The third figure is a waveform diagram when the magnetic copy density is 7.7.

FIG. 4 is a waveform diagram for the same magnetic copy density of 7.6.

The waveforms in these figures are near infrared rays (600~
104 ns) sensor and green sensor (540-58 ns)
This is a waveform obtained by 0n■), but when the near-infrared sensor and the green sensor are irradiated with a width of 2m/@ or more in the longitudinal direction of the insert, it is possible to detect irregularities in the ink, or carbon components, pigment components, or metal components contained in the ink. , paper quality, color shading, figure recognition, and other factors using Schiyano (irradiation according to the movement of the insert).
The optical signal is displayed as a voltage.

Combining two or more optical sensors with different wavelengths makes it easier to detect the difference in value depending on the type of banknote, and becomes an indispensable means for returning copies. The arrangement of these photosensors may be in the form of an insert. In this case, the front and back sides of the insert in the longitudinal direction are scanned at the same time, making it possible to more accurately determine roundness.
It becomes even more reliable. Further, although it is preferable to scan both sides simultaneously, it is also possible to use a controlled method depending on the sensor check. This wavelength is also generally used to check for the presence of a signal in the longitudinal direction of the insert. Therefore, the figure and waveform are opposite signals.

Looking at these waveform diagrams, the shapes are generally similar, but there are differences in the voltage values and peak widths. As can be seen from Figure 1, in the genuine bill, the voltage has sharp peaks at several points around 5V, and there is a continuous low voltage value (squash section) approximately in the center. It has become a thing. In the case of magnetic copying, if you try to keep the maximum wave height value within the range of the set value data of the genuine bill, the waveforms shown in Figures 2, 3, and 4 will be obtained, but the waveforms of the genuine bill and They are so different that they can be easily distinguished,
The constant voltage range in the center is considerably wider than that of genuine bills due to the density of the magnetic copy, and in conjunction with checking the voltage level of the highest peak value mentioned above, the authenticity can be determined very accurately. In addition, the data of other magnetic copies will be omitted as they may be significantly different from the genuine notes and are beyond the scope of the investigation.

- Effects of the invention] As described above, according to the counterfeit bill discriminating device according to the present invention,
Since the check is performed using two or more optical sensors having different wavelengths, the determination of M can be made even more accurately, resulting in high reliability.

[Brief explanation of the drawing]

Figure 1 shows a genuine bill (10
00 yen bill) Waveform diagram when the topsoil is 0. The second figure is a waveform diagram for the same magnetic copy density of 7.9. Figure 3 is a waveform diagram for the magnetic copy density of 7.7, and Figure 4 is a waveform diagram for the magnetic copy density of 7.6. Procedural correction! (Method) May 13, 1991 1, Indication of the case 1990 Patent Application No. 283343 2, Title of the invention Counterfeit banknote identification device 3, Person making the amendment Relationship to the case Patent applicant 4, Date of amendment order April 1685, 1991, Subject of amendment: Drawing plan 6, Contents of amendment: “Engraving of the specification originally attached to the application, as shown in the attached sheet (no change in content)” Engraving of drawings

Claims (1)

[Claims] It has two or more optical sensors with different wavelengths, and scans the longitudinal direction of the insert with each irradiation surface of a predetermined width to detect irregularities in the ink, carbon components, pigment components, metal components, paper quality, and color. A counterfeit bill discriminating device that detects factors such as shading and shape recognition as waveforms, compares the data with a memory that stores checkpoints of waveforms of genuine bills in advance, and operates an acceptance and return mechanism. .