JPH0660241A - Pattern discriminating device for paper sheet or the like - Google Patents

Abstract

PURPOSE:To surely prevent drop-out by providing each of a first and a second projecting means for projecting light whose wavelength is different. CONSTITUTION:In the pattern discriminating device for a paper sheet or the like, this device is constituted so that a lens array 1 positioned in the upper side across paper money A being a medium, and a first LED 2 positioned in the lower side are opposed to each other, and from this first LED 2, a red transmission light 3 of about 630-700nm wavelength is projected to the lens array 1 through the lower face (b) and the upper face (a) of the paper money A, and light processed optically by this lens array 1 is outputted to an image sensor 4. Also, this device is constituted so that a second LED 5 is provided in the oblique upper part of the upper face (a) of the paper money A, a green reflected light 6 of about 500-570nm wavelength from this second LED 5 is projected to the lens array 1 through the upper face (a) of the paper money A, and light processed optically by this lens array 1 is outputted to the image sensor 4. In such a state, the image sensor 4 reads pattern data, based on optical information from both the LEDs 2, 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet pattern discriminating apparatus which discriminates a pattern printed on a bill to discriminate the bill.

[0002]

2. Description of the Related Art Conventionally, as a paper sheet pattern discriminating apparatus of the above-mentioned example, a discriminating apparatus provided with a fluorescent lamp which emits white light as a light source of an image sensor, and a monochromatic light as a light source of an image sensor. Monochromatic LED (light emis)
It is an abbreviation for sion diode and refers to a discriminating device equipped with a light emitting diode.

The former discriminating apparatus has the advantage of not having a dropout color because it emits white light, but has the problem that the light source itself has a relatively short life. Although it has the advantage that it has a long life, it uses a monochromatic light. For example, when the printing color of a banknote and the monochromatic light are the same color, dropout (decrease in output) occurs and good pattern detection becomes difficult. There was a problem.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the life of the light source is extended and the dropout is prevented at the same time, the data on both the front and back surfaces of the medium can be read at a time, and the pattern can be discriminated at high speed. It is an object of the present invention to provide a paper sheet pattern discriminating apparatus that can be used.

[0005]

According to the present invention, there is provided a first light projecting means for outputting transmitted light to an image sensor, and a second light projecting means for outputting reflected light having a wavelength different from that of the first light projecting means. A paper sheet pattern discriminating apparatus comprising a light projecting unit and an image sensor for reading pattern data based on optical information from both of the light projecting units.

[0006]

According to the present invention, the transmitted light from the first light projecting means to the image sensor after passing through the paper sheets has the same printing color as the light projecting color of the first light projecting means. The optical signal level decreases when the front and back sides are present, whereas the optical signal level becomes high when a printing color different from the projection color of the first light projecting means is present on the front and back sides of the paper sheet.

Further, in the case where the light reflected from the second light projecting means to reach the image sensor has a printing color which is the same as the projection color of the second light projecting means on the surface of the paper sheet. The optical signal level decreases while the optical signal level increases when a printing color different from the projection color of the second projecting unit exists on the surface of the paper sheet. Since each of the above-mentioned light projecting means projects light having a different wavelength, in other words, different color light, a high level optical signal is obtained from at least one of the first and second light projecting means. .

[0008]

As described above, since the first and second light projecting means for projecting lights having different wavelengths are provided, dropout can be surely prevented, and the light from the first light projecting means can be prevented. It is possible to read the data on both the front and back sides of the paper sheet at a time by the transmitted light, and to clearly read the data on the surface of the paper sheet by the reflected light from the second light projecting unit to perform high-speed discrimination of the pattern. In addition to the above, the first and second light projecting means described above can be configured by LEDs that emit light of different wavelengths, so that the life of the light source can be extended. is there.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The drawings show a pattern discriminating apparatus for paper sheets, and a lens array 1 located above a paper money A as a medium.
And the first LED 2 located on the lower side, and the red transmitted light 3 having a wavelength of about 630 to 700 nm from the first LED 2 is projected onto the lens array 1 via the lower surface b and the upper surface a of the banknote A, The light optically processed by the lens array 1 is configured to be output to the image sensor 4.

A second L is provided diagonally above the upper surface a of the bill A.
The ED5 is provided, and the wavelength from the second LED 5 is about 500 to
The green reflected light 6 of 570 nm is projected onto the lens array 1 through the upper surface a of the bill A, and the light optically processed by the lens array 1 is output to the image sensor 4 as described above.

Here, the above-mentioned image sensor 4 converts one-dimensional or two-dimensional or more optical information into a time-series electric signal.
The pattern data is read based on the optical information from 5.

In this embodiment, the first LED 2 for projecting red light having a large amount of light is set as the transmissive light source of the image sensor 4 so that sufficient light output can be obtained even when the bill A is transmitted, and As a reflection light source of the sensor 4, an LED 5 for projecting green light, which is inferior in light quantity according to the standard, can be used.

The illustrated embodiment is configured as described above, and the operation will be described below. For convenience of explanation, a red print pattern R (hereinafter abbreviated as a red pattern) and a green print pattern G (hereinafter abbreviated as a green pattern) as shown in FIG. )
The case will be described as an example.

In FIG. 2A, when the red pattern R is printed on the upper surface a of the bill and the red pattern R is printed on the lower surface b of the bill, the red transmitted light 3 of the first LED 2 is transmitted.
Is a transmitted light output having two small optical signal levels (hereinafter, simply abbreviated as low level in the sense that the signal level in the negative direction is small) L and L corresponding to the patterns R and R, while The output of the green reflected light 6 of the second LED 5 has a large optical signal level (hereinafter simply referred to as high level in the sense that the signal level in the negative direction is large) H corresponding to the red pattern R on the bill upper surface a. Since the output becomes the output, and the above-mentioned transmitted light output and reflected light output are processed in time series by the image sensor 4, the output of the image sensor 4 has a high level H and a low level L as shown in FIG. Will be output.

In FIG. 2B, when the green pattern G is printed on the upper surface a of the bill and the green pattern G is printed on the lower surface b of the bill, the output of the red transmitted light 3 of the first LED 2 is the respective patterns G, G. Corresponding to the output of the transmitted light having two high levels H, H, while the second LED
The output of the green reflected light 6 of 5 becomes a reflected light output having a low level L corresponding to the green pattern G on the upper surface a of the bill, and the above-mentioned transmitted light output and reflected light output are processed in time series by the image sensor 4. Therefore, the output of the image sensor 4 has two high levels H and H as shown in FIG.
Will be output.

In FIG. 2C, when the red pattern R is printed on the upper surface a of the banknote and the green pattern G is printed on the lower surface b of the banknote, the output of the red transmitted light 3 of the first LED 2 is each pattern G, G. While the transmitted light output has one low level L and one high level H corresponding to, the output of the green reflected light 6 of the second LED 5 is the bill upper surface a.
The reflected light output having a high level H corresponding to the red pattern R of No. 1 and the transmitted light output and the reflected light output described above are processed in time series by the image sensor 4, and the output of the image sensor 4 is shown in FIG. As shown in (c), the output has two high levels H and H.

In FIG. 2D, when the green pattern G is printed on the upper surface a of the banknote and the red pattern R is printed on the lower surface b of the banknote, the output of the red transmitted light 3 of the first LED 2 is each pattern G, R. While the transmitted light output has one high level H and one low level L corresponding to, the output of the green reflected light 6 of the second LED 5 is the bill upper surface a.
The reflected light output having the low level L corresponding to the green pattern G of FIG. As shown in (d), the output has a high level H and a low level L.

That is, even when the print colors of the patterns R and G are the same as the emission colors of the LEDs 2 and 5 as shown in FIGS. You can

In summary, since the first and second LEDs 2 and 5 for projecting lights having different wavelengths are provided, it is possible to surely prevent the dropout, and the first LED
There is an effect that the data on the upper and lower surfaces of the bill can be read at once by the transmitted light from 2, and the data on the upper surface of the bill can be clearly read by the reflected light from the second LED 5 to perform high-speed discrimination of the pattern. In addition, since the transmission light source and the reflection light source described above are configured by the LEDs 2 and 5 that generate lights having different wavelengths, there is an effect that the life of the light source can be extended.

In the correspondence between the configuration of the present invention and the above-mentioned embodiment, the first light projecting means of the present invention corresponds to the first LED 2 of the above-mentioned embodiment, and similarly, the second light projecting means,
Although it corresponds to the second LED 5 and the paper sheets correspond to the banknote A, the present invention is not limited to the configuration of the above-described embodiment.

For example, in the above embodiment, the wavelength is about 630.
Although LEDs 2 and 5 which emit red light having a wavelength of -700 nm and green light having a wavelength of approximately 500 to 570 nm are used, LEDs which emit other light having different wavelengths may be used.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a paper sheet pattern discriminating apparatus of the present invention.

FIG. 2 is an explanatory diagram showing transmitted light, reflected light, and outputs of an image sensor corresponding to each pattern.

[Explanation of symbols]

 2 ... 1st LED 3 ... Transmitted light 4 ... Image sensor 5 ... 2nd LED 6 ... Reflected light A ... Banknote

Claims (1)

[Claims] 1. A first light projecting means for outputting transmitted light to an image sensor, a second light projecting means for outputting reflected light having a wavelength different from that of the first light projecting means to the image sensor, and the both light projecting means. A pattern determination device for paper sheets, comprising: an image sensor that reads pattern data based on optical information from an optical unit.