JPS61201396A - Paper money discriminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a banknote inspection device that determines the shape, type, fitness, authenticity, etc. of banknotes, and particularly relates to improvements in its optical system.

[Technical Precedence of the Invention i1] Conventionally, there is a banknote inspection device of this type as shown in FIG. 3. In the figure, P represents a banknote, which is conveyed by the conveyor belt 1 in the direction of the arrow in the figure.

A first light source 2 is provided above the conveyor belt 1, and a condenser lens 3 is provided below the conveyor belt 1 facing the first light source 2.
A first photoelectric converter 4 is provided, and the first photoelectric converter 4 receives the transmitted light from the banknote P through the condensing lens 3 and converts it into an electrical signal. ing. Here, the first photoelectric converter 4 is, for example, a line sensor disposed in a direction perpendicular to the conveying direction of banknotes P.

Further, a second light source 5, a condensing lens 6, and a second photoelectric converter 7 are provided above the conveyor belt 1.
The condensing lens 6 collects the reflected light from the surface of the banknote 2 due to the light irradiation.
The light is received by the second photoelectric converter 7 through the light and converted into an electrical signal. Further, below the conveyor bells 1 to 1, a third light source 8, a condensing lens 9, and a third photoelectric converter 1 are provided.
0 is provided, and the reflected light from the back side of the banknote P due to the light irradiation of the third light source 8 is transmitted to the third photoelectric converter 10 via the condensing lens 9.
It is designed to receive light and convert it into an electrical signal. Each of these parts 2 to 10 is housed in a dark box 11 and constitutes a first optical system 12 that detects the shape, type, fitness, etc. of the banknote P. Further, above the conveyor belt 1, a fourth light source (low-pressure mercury lamp) 13 that emits ultraviolet light, an ultraviolet wavelength region transmission filter 14, a condensing lens 15, a blue wavelength region transmission filter 16, and a fourth photoelectric converter 17 are provided. The surface of the banknote P is irradiated with ultraviolet light from the fourth light source 13 via the filter 14, and the light emitted from the fluorescent whitening agent contained in the banknote P due to this light irradiation is transmitted through the condenser lens 15 and the filter 16. The fourth photoelectric converter 17 receives the light and converts it into an electrical signal. Each of these components 13 to 17 is housed in a dark box 18 and constitutes a second optical system 19 that detects the presence or absence of a fluorescent whitening agent contained in the banknote P.

Thus, the discrimination circuit 20 discriminates the quality, width, hole, tear, etc. of the banknote P based on the output signal of the first photoelectric converter 4. Further, the discrimination circuit 18r: is the second and third photoelectric converter 7.
, 10, the type and fitness of the banknote P are determined. Furthermore, the discrimination circuit 18 detects the presence or absence of a fluorescent whitening agent contained in the banknote P based on the output signal of the fourth photoelectric converter 17, and determines whether the banknote P is genuine or false according to the detection result. Generally, paper for banknotes does not contain fluorescent whitening agents, but counterfeit banknotes often contain fluorescent brighteners, so they are effective in determining authenticity. Figure 4 shows the emission energy distribution characteristics when the fluorescent whitening agent contained in the paper of the counterfeit note is excited with ultraviolet light, and it can be seen that it emits bluish white light with a peak at 447 nm.

[Problems with Background Art] Conventionally, as shown in FIG. 3, the first optical system 12 and the second optical system 19 are arranged with their positions shifted.

That is, since the second light source 5 and the third light source 8 of the first optical system 12 use incandescent bulbs, the blue wavelength component light emitted from this light emitting system is transmitted to the condensing lens 15 in the second optical system 19. The light from the second light source 5 and the third light source 8 that enters the light receiving system of the filter 16 and the fourth photoelectric converter 17 contains a blue wavelength component), and this light is fluorescent light that is not included in the banknote P. In order to avoid false detection as if the brightener was present, the optical systems were moved away from each other to avoid any interference. However, with such a configuration, the entire device not only becomes very large in size, but also requires a large installation space, resulting in high costs.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to provide a banknote inspection device that can reduce the size and cost of the entire device and requires only a small installation space. There is a particular thing.

[Summary of the Invention] In order to achieve the above object, the present invention is configured such that each optical system is housed integrally in a single storage box so as not to affect each other.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the same parts as in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted, and only the different parts will be explained in detail. In FIG. 1, first, second . Third light source 2.5.
8, a light source having an emission energy distribution (green emission) as shown in FIG. 2 is used. In this case, a light source having the above emission energy distribution characteristics may be used, or a light source may be used in combination with a green wavelength region transmission filter. Further, as the filter 14, an optical filter (a filter that transmits only ultraviolet light) having a transmittance as shown in FIG. 2 with characteristic B is used. Roughly speaking, as the filter 16, an interference filter (a filter that transmits only the blue wavelength region) having a good spectral transmittance as characteristic C shown in FIG. 2 is used.

These parts 2 to 10 and 13 to 17 are each housed integrally in a dark box 21 serving as a single storage box. By configuring in this way, the first. Second. Even if the light from the third light source 2, 5.8 enters through the condenser lens 15, it is not generated as a signal in the fourth photoelectric converter 17 because it is cut by the filter 16. On the other hand, if the banknote P is a counterfeit banknote, the light emitted from the fluorescent whitening agent is filtered through the filter 16.
Since it can be detected through the

In this way, by integrating the optical system that detects the shape, type, fitness, etc. of banknotes and the optical system that detects the presence or absence of fluorescent whitening agent so that they do not affect each other, the entire device can be made smaller and lower in cost. It can be expected to have various effects, such as contributing to the development of new technologies, and requiring less space for installation.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a banknote inspection device that can reduce the size and cost of the entire device, and can also cover a narrow installation space.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention, Fig. 2 is a characteristic diagram showing the transmittance characteristics of the optical filter and the emission energy distribution characteristics of the light source in the same embodiment, and Fig. 3 is a characteristic diagram showing the conventional FIG. 4, which is a block diagram of the banknote inspection device, is a characteristic diagram showing the emission energy distribution characteristics of the fluorescent whitening agent contained in the banknote. P... Banknotes, 1... Conveyor belt, 2.
5.8°14... light source, 3,6,9.15...
...Condensing lens, 4.7, 10.17...
Charging converter, 14.16... Optical filter, 2
0... Discrimination circuit, 21... Dark box (storage box). Agent Patent attorney Noriyuki Chika (and 1 other person) Figure 2 Moxibustion (nm) Figure 4

Claims (5)

[Claims] (1) A first light source that irradiates light onto the banknotes being transported; a first photoelectric converter that receives light from the banknotes irradiated by the first light source and converts it into an electrical signal; and a first photoelectric converter that irradiates the banknotes with ultraviolet light. a second light source that emits ultraviolet light; a second photoelectric converter that receives light from the banknotes that is irradiated with ultraviolet light from the second light source and converts it into an electrical signal; An optical filter having light transmittance characteristics that do not overlap with the emission energy distribution of one light source, and a single unit that integrally houses the first light source, first photoelectric converter, second light source, second photoelectric converter, and optical filter. A banknote inspection device characterized by comprising a storage box. (2) The banknote inspection device according to claim 1, wherein the first light source emits green light. (3) The banknote inspection device according to claim 1, wherein the first photoelectric converter is a line sensor disposed in a direction perpendicular to the conveyance direction of the banknote. (4) The banknote inspection device according to claim 1, wherein the second light source comprises a low-pressure mercury lamp and an optical filter that transmits only ultraviolet light. (5) The banknote inspection device according to claim 1, wherein the optical filter is an interference filter.