A multi-spectral banknote inspection device and a banknote counting machine

Abstract

The present invention discloses a banknote feeding channel for banknote transportation, a banknote inspection module arranged on the banknote feeding channel, and a control system for controlling the operation of the banknote inspection module, wherein the banknote inspection module comprises a first multi-spectrum light source module, a light signal acquisition module, and a second multi-spectrum light source module fixedly installed on the banknote feeding channel, wherein the first multi-spectrum light source module and the light signal acquisition module are arranged on the same side of the banknote feeding channel, and the light signal acquisition module and the second multi-spectrum light source module are arranged on both sides of the banknote feeding channel, respectively, and the light signal acquisition module is used to receive and collect the reflected light signal generated by the first multi-spectrum light source module irradiating the banknote, or receive and collect the transmitted light signal when the second multi-spectrum light source module irradiates the banknote, and output the corresponding electrical signal. The present invention can realize dual authentication of transmission and reflection, so that the authentication accuracy is higher and the recognition is more sensitive.

Description

Technical Field

[0001] The present invention relates to the field of financial equipment, and in particular to a multi-spectral banknote inspection device and a banknote counting machine. Background Art

[0002] Currently, banknote counting machines on the market usually use a direct penetration method to detect counterfeits. However, the principle of this transmission detection is that light penetrates banknotes and uses the different light absorption characteristics of different inks to detect counterfeits. The problem that must be faced is that the intensity of light drops sharply after penetration, which may lead to insufficient light intensity after transmission, insensitive recognition of photosensors, and insufficient identification accuracy. In addition, current banknote counting machines usually use detection methods for the anti-counterfeiting part and perform fixed-point detection on the anti-counterfeiting area, resulting in a single currency type.

[0003] A Chinese patent with patent number CN201921866183.X discloses a highly applicable banknote counterfeit detection device, including a lamp tube fixing frame, a plurality of light-emitting diodes fixed on the lamp tube fixing frame, a sensor fixing frame, and an information analysis and processing module. The light-emitting diodes are arranged in two groups in the width direction of the lamp tube fixing frame, namely a transmitted light group and a reflected light group. The transmitted light group is fixedly provided with a corresponding photosensitive sensor on the sensor fixing frame, and the light-emitting diodes and photosensitive sensors of the reflected light group are fixedly provided on the lamp tube fixing frame. A group of lenses is provided between the lamp tube fixing frame and the banknote. This scheme realizes dual counterfeit detection from transmission and reflection by alternating the two groups of light sources. At the same time, by utilizing the characteristics of the lens, the counterfeit detection accuracy is higher, the recognition is more sensitive, and the scope of application is wider.

[0004] The defects of the above-mentioned prior art are: 1. When the transmission light group and the reflection light group work, they detect different positions of the banknotes successively, resulting in low position accuracy of banknote recognition; 2. The transmission light group and the reflection light group are installed together in the width direction of the lamp tube fixing frame, which takes up too much space and easily leads to the single function of banknote identification. 3. The number of photosensitive sensors used is large, the cost is high, and there are certain differences in the detection results of different sensors, resulting in a decrease in the accuracy of counterfeit identification. Summary of the invention

[0005] The present invention aims to solve the problems existing in the above-mentioned prior art and provides a multi-spectral banknote inspection device which can realize dual authentication of transmission and reflection, so as to make the authentication accuracy higher and the recognition more sensitive.

[0006] The present invention solves its technical problems by adopting a technical solution: a multi-spectral banknote inspection device, comprising a banknote feeding channel for conveying banknotes, a banknote inspection module arranged on the banknote feeding channel, and a control system for controlling the operation of the banknote inspection module, wherein the banknote inspection module comprises a first multi-spectral light source module fixedly mounted on the banknote feeding channel, a light signal acquisition module, and a second multi-spectral light source module, wherein the first multi-spectral light source module and the light signal acquisition module are arranged on the same side of the banknote feeding channel, and the light signal acquisition module and the second multi-spectral light source module are respectively arranged on both sides of the banknote feeding channel, and the light signal acquisition module is used to receive and collect reflected light signals generated on banknotes when the first multi-spectral light source module irradiates the banknotes, or to receive and collect transmitted light signals when the second multi-spectral light source module irradiates the banknotes, and output corresponding electrical signals.

[0007] For further improvement, the first multi-spectrum light source module and the second multi-spectrum light source module are RGB light sources, and the light signal acquisition module is an RGB color sensor.

[0008] Further improvement, the RGB light source is an RGB three-color integrated lamp or an RGB three-color combination lamp having a red light-emitting lamp, a green light-emitting lamp and a blue light-emitting lamp.

[0009] Further improvement, the RGB light source is a laser light or an LED light.

[0010] For further improvement, the first multi-spectrum light source module, the light signal acquisition module and the second multi-spectrum light source module are respectively provided with a first condenser, a diffuser and a second condenser.

[0011] Further improvement, the control system includes a modulation circuit module, an information converter module and a control module, the control module is electrically connected to the modulation circuit module and the information converter module respectively, the modulation circuit module is electrically connected to the first multi-spectrum light source module and the second multi-spectrum light source module respectively, and the information converter module is electrically connected to the light signal acquisition module.

[0012] For further improvement, the control system further includes a banknote feeding mechanism and a display module respectively arranged inside and outside the banknote feeding channel, and the banknote feeding mechanism and the display module are both electrically connected to the control module.

[0013] Further improvement is provided in a banknote counting machine, which is provided with the above-mentioned banknote inspection device, and the banknote inspection device occupies a small use space, making its banknote inspection function more accurate and diversified.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This solution uses the dual principles of light transmission and reflection to shine light on banknotes, detect and compare similar colors on banknotes, with higher discrimination, less susceptible to oil stains and defects on banknotes, and more efficient and accurate detection;

[0016] 2. This solution uses RGB light source and RGB color sensor, which can emit and receive light of corresponding wavelengths, with good consistency, reducing the influence of stray light, further enhancing the collection sensitivity of optical signals, and improving the accuracy of counterfeit detection. This solution has higher accuracy, stronger sensitivity and lower procurement cost;

[0017] 3. The two light sources of reflection and penetration in this scheme are respectively set on both sides of the banknote, which saves the use space on one side, and the banknote detection function can be more diversified. Moreover, the two kinds of light, reflection and penetration, are not easy to interfere with each other. By setting up multiple sets of banknote inspection devices, multi-point dual optical detection can be realized, which can be applied to the full-width detection of banknotes in various countries in the world, such as thickness, face value, anti-counterfeiting, counting and scoring;

[0018] 4. This solution uses an illumination signal acquisition module to receive reflected light and transmitted light, which saves installation and manufacturing costs, eliminates the reception differences in detection results of different sensors, and effectively improves the device's authentication accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the working principle of the present invention;

[0020] Figure 2 A schematic diagram of a lighting path of the present invention;

[0021] Figure 3 A schematic diagram of the illumination path used in various combinations of the present invention;

[0022] Figure 4 A schematic diagram of an optical path of a prior art solution;

[0023] Description of reference numerals: 1. first multi-spectral light source module, 2. light signal acquisition module, 3. second multi-spectral light source module, 4. first condenser, 5. diffuser, 6. second condenser. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] See attached Figure 1, this embodiment: a multi-spectral banknote inspection device, including a banknote feeding channel for banknote transportation, a banknote inspection module arranged on the banknote feeding channel, and a control system for controlling the operation of the banknote inspection module, the banknote inspection module includes a first multi-spectral light source module, a light signal acquisition module, and a second multi-spectral light source module fixedly installed on the banknote feeding channel, the first multi-spectral light source module and the light signal acquisition module are arranged on the same side of the banknote feeding channel, the light signal acquisition module and the second multi-spectral light source module are respectively arranged on both sides of the banknote feeding channel, the first multi-spectral light source module and the second multi-spectral light source module are installed in the vertical direction of the banknote, and the light beams emitted by them can be perpendicular to the banknote or have a certain angle with the banknote, the light signal acquisition module is used to receive and collect the reflected light signal generated by the first multi-spectral light source module irradiating the banknote, or receive and collect the transmitted light signal when the second multi-spectral light source module irradiates the banknote, and output the corresponding electrical signal.

[0026] Working principle: After the banknotes enter the counting machine, they are transported and counted through the banknote feeding channel. When the banknotes pass between the first multi-spectral light source module and the second multi-spectral light source module, the control system controls the first multi-spectral light source module and the second multi-spectral light source module to scan the banknotes alternately. The first multi-spectral light source module emits RGB three-color light alternately to illuminate the designated site area of ​​the banknote, and the generated reflected light is received by the light signal acquisition module. Then the second multi-spectral light source module emits RGB three-color light alternately to illuminate the corresponding site area of ​​the banknote, and the generated transmitted light agrees to be received by the light signal acquisition module and is uniformly fed back to the control system by a light signal acquisition module. The received data has high reliability and small error. The two sets of data are compared with each other, thereby improving High identification accuracy. This solution uses the dual principles of transmission and reflection to detect and compare similar colors, materials, and thicknesses at the same monitoring point on the banknote (the relevant detection methods for banknotes can refer to patent documents CN107134046B and CN105447955A). It has a higher degree of distinction and is not easily affected by oil stains and defects on banknotes. The detection is more efficient and accurate, ensuring the identification accuracy, identifying various banknote versions and detecting various types of counterfeit banknotes. It can be used for full-width detection of banknotes of various countries, face value, anti-counterfeiting, inspection, scoring and other purposes. The first multi-spectral light source module and the second multi-spectral light source module can be used complementary. If one of them fails, as long as the other one works normally, it will not affect the normal use of the inspection machine, and the reliability is high. The circuit technologies related to power supply, light signal modulation, signal reception, analog-to-digital conversion, data transmission control, etc. of the above-mentioned electronic components belong to the prior art or common knowledge technology, and will not be elaborated here.

[0027] The first multi-spectrum light source module and the second multi-spectrum light source module are RGB light sources, and the light signal acquisition module is an RGB color sensor. The RGB light source and the RGB color sensor can emit and receive light of corresponding wavelengths, have good consistency, eliminate interference from non-receiving internal wavelength light sources, reduce the influence of stray light, further enhance the collection sensitivity of light signals, and improve accuracy and counterfeit detection precision.

[0028] The RGB light source is an RGB three-color integrated lamp or an RGB three-color combination lamp with a red light, a green light and a blue light. The RGB three-color integrated lamp has high integration and small size. The RGB three-color light is mixed to display white light, and the manufacturing requirements are relatively high. The RGB three-color integrated lamp can use a bulb that can emit three-color light at the same current size or a bulb that can emit different colors of light according to different current sizes. The manufacture of the RGB three-color combination lamp is relatively convenient, and you can choose to use it in a mixed way or use it separately and alternately, thereby improving the sensitivity of monochrome detection. When it is best to detect, the banknotes are scanned in a group of six in one cycle, and three red, green and blue lights are emitted alternately from top to bottom to the light signal acquisition module. The lights are not easy to interfere with each other, so that the identification accuracy of banknotes is higher.

[0029] The RGB light source is a laser lamp or an LED lamp. Compared with ordinary light sources, laser lamps have better monochromaticity and directionality, and the focusing point is more accurate, which can improve the accuracy of detection and save the cost of setting up lenses. LED lamps can directly convert electricity into light, with high luminous efficiency. Different semiconductor PN junctions can directly emit red, yellow, blue, green, cyan, orange, purple, and white light. LED light sources are highly directional, and the design of lamps needs to consider the optical properties of LEDs. The banknote inspection module is provided with at least two groups, which can detect banknotes at different positions and angles, and collect the color change signals of the optically variable ink on the banknotes to improve the identification effect of banknotes.

[0030] As attached Figure 2As shown, the first multi-spectral light source module, the light signal acquisition module, and the second multi-spectral light source module are respectively provided with a first condenser, a diffuser, and a second condenser. The first condenser can converge the light emitted by the first multi-spectral light source module to a specified site area, which can narrow the irradiation range and improve the reflection effect. The second condenser can converge the light emitted by the multi-spectral light source module to the corresponding site area, which can increase the irradiation intensity, improve the penetration effect, enhance the intensity of the light signal collected by the light signal acquisition module, and improve the accuracy of counterfeit detection. The diffuser can evenly diffuse the reflected light or the transmitted light to the light signal acquisition module, which can expand the receiving range and has good fault tolerance, and can effectively improve the receiving effect and measurement accuracy. The inclination positions of the first multi-spectral light source module, the light signal acquisition module, the second multi-spectral light source module, the first condenser, the diffuser, and the second condenser can all be freely set as needed. As shown in the attached Figure 3 As shown, the banknote inspection module can be arranged in multiple combinations up and down to improve the accuracy of banknote identification. The distance between the first condenser, the diffuser and the second condenser and the banknote surface is 3-5mm. The inclination angle of the first condenser and the first multi-spectrum light source module can be adjusted by the first azimuth adjustment mechanism to obtain different light reflection angles, the second condenser and the second multi-spectrum light source module can be adjusted by the second azimuth adjustment mechanism to obtain different light transmission angles, the diffuser and the light signal acquisition module can be adjusted by the second azimuth adjustment mechanism to obtain different light receiving angles, so as to better receive the light signal, and the diffuser and the light signal acquisition module are also provided with a horizontal moving mechanism, which can adjust the distance between the first multi-spectrum light source module and the light signal acquisition module to improve the accuracy of signal reception.

[0031] The control system includes a modulation circuit module, an information converter module and a control module. The control module is electrically connected to the modulation circuit module and the information converter module respectively. The modulation circuit module is electrically connected to the first multi-spectrum light source module and the second multi-spectrum light source module respectively. The information converter module is electrically connected to the light signal acquisition module. The control module controls the modulation circuit module to make the multi-spectrum light source module emit light. The information converter module is used to receive and convert the light signal collected by the light signal acquisition module and send the processed data to the control module. The control module can receive and process the information fed back by the light signal acquisition module, so as to realize the identification of banknotes.

[0032] The control system also includes a banknote feeding mechanism and a display module respectively arranged inside and outside the banknote feeding channel, and the banknote feeding mechanism and the display module are both electrically connected to the control module. The banknote feeding mechanism is used to transport banknotes through the banknote feeding channel, and the display module is used to receive data sent by the control module and display images thereof. The banknote feeding mechanism is electrically connected to the control module, and the control module can control the modulation circuit module to perform pulse modulation according to the banknote feeding speed of the banknote feeding mechanism, and alternately drive the multi-spectrum light source module to emit light, and the control module can display the inspection results through the display module, and the display module is a touch screen, a liquid crystal display or a digital tube.

[0033] The banknote conveying channel is also provided with an ultraviolet light emitter and a fluorescent ultraviolet sensor, which are electrically connected to the modulation circuit module and the information converter module respectively, and can perform ultraviolet light inspection on banknotes, thereby increasing the accuracy and reliability of the invention in inspecting the authenticity of banknotes.

[0034] As attached Figure 4 The present invention shows a prior art for banknote inspection (similar technologies can refer to patent document CN205750988U), which is composed of a multi-spectral light source module and two light signal acquisition modules. The two light signal acquisition modules are respectively arranged on both sides of the banknote feeding channel. The two light signal acquisition modules respectively and simultaneously receive and collect the reflected light signal and the transmitted light signal generated by the multi-spectral light source module on the banknote, and output corresponding electrical signals. The multi-spectral light source module simultaneously sends a beam of light to detect the same position on the banknote. The two light signal acquisition modules respectively receive the reflected light and the transmitted light generated by the same beam of light. The emission and transmission phenomena are not easy to control, and are prone to mutual interference. The two light signal acquisition modules receive signals separately from top to bottom, which is also prone to poor reception. Compared with the solution of the present invention, it uses a small number of light sources and a large number of acquisition sensors, resulting in high costs and low light intensity received by the sensors, resulting in a decrease in the accuracy of banknote detection.

[0035] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A multi-spectral banknote inspection device, comprising a banknote feeding channel for conveying banknotes, a banknote inspection module arranged on the banknote feeding channel, and a control system for controlling the operation of the banknote inspection module, characterized in that: The banknote inspection module comprises a first multi-spectrum light source module, a light signal acquisition module and a second multi-spectrum light source module fixedly mounted on the banknote feeding channel, the first multi-spectrum light source module and the light signal acquisition module are arranged on the same side of the banknote feeding channel, the light signal acquisition module and the second multi-spectrum light source module are respectively arranged on both sides of the banknote feeding channel, the light signal acquisition module is used to receive and collect the reflected light signal generated by the first multi-spectrum light source module irradiating the banknote, or receive and collect the transmitted light signal when the second multi-spectrum light source module irradiates the banknote, and output the corresponding electrical signal; the first multi-spectrum light source module and the second multi-spectrum light source module are respectively arranged on both sides of the banknote feeding channel, the light beams emitted by the first multi-spectrum light source module and the second multi-spectrum light source module form a certain angle with the banknote, and the reflected light emitted by the first multi-spectrum light source module and the transmitted light emitted by the second multi-spectrum light source module work alternately; The first multi-spectrum light source module and the second multi-spectrum light source module are RGB light sources, and the light signal acquisition module is an RGB color sensor; the RGB light source is an RGB three-color integrated lamp or an RGB three-color combination lamp having a red light, a green light and a blue light; the RGB light source is a laser lamp or an LED lamp; The first multi-spectrum light source module, the light signal acquisition module and the second multi-spectrum light source module are respectively provided with a first condenser, a diffuser and a second condenser; The control system includes a modulation circuit module, an information converter module and a control module, wherein the control module is electrically connected to the modulation circuit module and the information converter module respectively, the modulation circuit module is electrically connected to the first multi-spectrum light source module and the second multi-spectrum light source module respectively, and the information converter module is electrically connected to the light signal acquisition module; the control system also includes a banknote feeding mechanism and a display module respectively arranged inside and outside the banknote feeding channel, and the banknote feeding mechanism and the display module are both electrically connected to the control module; The banknote inspection module adopts a multiple upper and lower combination arrangement; the distance between the first condenser, the diffuser and the second condenser and the banknote surface is 3-5mm; the inclination angle of the first condenser and the first multi-spectrum light source module can be adjusted by a first azimuth adjustment mechanism to obtain different light reflection angles; the second condenser and the second multi-spectrum light source module can be adjusted by a second azimuth adjustment mechanism to obtain different light transmission angles; the diffuser and the light signal acquisition module can be adjusted by a second azimuth adjustment mechanism to obtain different light receiving angles; a horizontal moving mechanism is also provided on the diffuser and the light signal acquisition module to adjust the distance between the first multi-spectrum light source module and the light signal acquisition module.

2. A money counting machine, characterized in that: A banknote inspection device as claimed in claim 1 is provided thereon.

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