CN2498670Y

CN2498670Y - Laser discriminator of RMB

Info

Publication number: CN2498670Y
Application number: CN00257546U
Authority: CN
Inventors: 樊崇理
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-30
Filing date: 2000-10-30
Publication date: 2002-07-03
Anticipated expiration: 2010-10-30

Abstract

The utility model disclosed an RMB laser counterfeit banknote identification device, wherein, an infrared semiconductor laser emits an infrared modulation light and form fine faculae on the specific area of the banknote (6) by a collimating mirror(8) and a focusing mirror(7), the faculae blazes visible faculae on the banknote, the dispersive light of the two kinds of faculae on the banknote is received by a receiving object lens (5) to form parallel light beam, a dispersive device (4) in the parallel light beam divides the useful visible light from the useless infrared light by an angle, and adopts optical and mechanical methods to get rid of the useless light, the useful visible light is received by a photoelectric cell (1) and processed by the circuit to use for identifying counterfeit banknote. The utility model is wildly applicable to devices like currency counting machines and vending machines.

Description

Renminbi laser truth identification device

The utility model is relevant with the Renminbi truth identification.

One hundred yuan of counterfeit money of 99 years versions that domestic and international undesirable copies since one hundred yuan of distribution of 99 years versions causes the financial market confusion and causes the tremendous economic loss to the country and people also in succession in circulation on the market.So in recent years in succession exploitation come out many kinds of Renminbi truth identification devices at various currency to changing planes, using on the paper money counter, vending machine, cash inspecting machine.The currency truth identification device of in the past developing adopts detection methods such as Ultraluminescence effect, magnetic field intensity, infrared light transmission intensity more, no a kind of be to adopt laser anti-counterfeit detection technique described in the utility model, thereby higher for the higher one hundred yuan of loss of 99 years versions of pseudo-technology for making.

One hundred yuan of 99 years version is forged in order to prevent, has adopted many high-tech anti-counterfeiting technologies.One of them is exactly certain specific region at currency, and its pattern is to form with a kind of extremely difficult specialty inks printing of copying.This colored ink can inspire the visible light of specific wavelength under specific invisible infrared laser irradiation.This is characterized as one hundred yuan of true and false of 99 years versions of identification a kind of reliable technique foundation is provided, and it is that the various denomination Renminbi of in the past issuing do not possess.According to this intrinsic characteristics of one hundred yuan of 99 years version, the utility model provides the technology of one hundred yuan of true and false of 99 years versions of a kind of quick identification.

The purpose of this utility model is to overcome in the past, and Renminbi truth identification device detects one hundred yuan of high shortcoming of flase drop efficient of 99 years versions.For the Renminbi of later distribution, if having and one hundred yuan of same anti-counterfeiting technology of 99 years versions, the technology that all available the utility model provides is discerned.Utilize the equipment such as paper money counter, vending machine, cash inspecting machine of the utility model manufacturing can quick identification to go out counterfeit money and picked out, thereby can prevent effectively that counterfeit money from circulation on the market, reducing the country and people's economic loss.

The technical solution of the utility model is as follows: this Renminbi laser truth identification device is made up of infrared semiconductor laser and optical beam transformation Focused Optical system, flashlight reception and processing optical system, photoelectric conversion device, infrared light gatherer, semiconductor laser driving and modulation circuit, advance signal circuit, filtering circuit, de-noising circuit and power amplifier etc.The infrared laser beam that infrared semiconductor laser sends is through optical beam transformation Focused Optical system collimation and gather into a strip small light spot and be radiated at specific region on the Renminbi paper, inspire with laser facula and be in the equirotal visible light spot of same position, this is useful signal hot spot.The diffused light that this visible light spot and above-mentioned laser facula produce through the bank note scattering was received and handled optical system simultaneously by flashlight receiving objective reception and collimation obtain a parallel beam.Since include in this parallel beam use up with two kinds of compositions of useless infrared laser and useless infrared laser than signal light intensity manyfold, the light of these two kinds of different wave lengths is synchronous on time domain, be difficult to separate, thereby separately be the key of the technical program how the light of these two kinds of wavelength with circuit.Can adopt spike interference filter to filter useless infrared laser, pass through, handle to subsequent conditioning circuit and cause difficulty but still have stronger infrared laser because manufacturing is difficult.So settled the color separation device in the parallel light path after signal receives and handles the optical system receiving objective, it is separated into certain angle with the light of these two kinds of different wave lengths in the space, the image-forming objective lens that is received and handled by signal again in the optical system forms two separately laser image spot of certain distance on focal plane, with an infrared light gatherer useless infrared laser is collected, and allow useful visible signal light by the slit mouth in the photoelectric conversion device, and receive by the photoelectric tube in the photoelectric conversion device and to convert electric signal to, this electric signal obtains having the useful signal of certain power through aforesaid various processing of circuit, thereby promotes the purpose that some functional element reaches the true and false currency of automatic identification.

In order to maximally utilise the infrared laser power of infrared semiconductor laser emission, collimating mirror group in the above-mentioned optical beam transformation Focused Optical system receives the laser that semiconductor laser was sent and is collimated into parallel beam with large aperture angle, focus lamp in the optical beam transformation Focused Optical system focuses on then, to obtain a strip small light spot on note surface.

Flashlight in the technical program receives and handles optical system, is made up of receiving objective, chromatic dispersion device and image-forming objective lens.The front focus of receiving objective is positioned at note surface, just in time is radiated at the laser facula on the bank note and is coincided by the visible light spot that it inspires with aforementioned.Thereby these two kinds of hot spots are collimated into parallel beam through light that bank note distributes after receiving objective receives, and facilitate like this and lay the chromatic dispersion device in this parallel light path.The two angled parallel beams that obtain through the chromatic dispersion of chromatic dispersion device through the image-forming objective lens imaging, thereby form two laser image spot on the back focal plane of image-forming objective lens.The focal length of image-forming objective lens is answered long enough, so that two laser image spot are easy to be separated by the slit in the photoelectric conversion device and extract.

Owing to utilize finance devices such as paper money counter that the utility model constitutes, vending machine to use by day or under the good situation of lighting condition.So the background noise that daylight and light cause is entrained in together with flashlight inevitably.Because flashlight is very weak, background noise is very strong, is the another key problem in technology of the utility model so how to extract useful signal from ground unrest.The semiconductor laser that the technical program adopts drives and modulation circuit sends semiconductor laser to have the light modulated of certain power.The visible signal light that this modulating lasering beam is radiated on the bank note and is inspired also is light modulated, and the modulating frequency of its frequency and laser is identical.The ultra-weak electronic signal that this signal converts to after aforesaid photoelectric tube receives also has the frequency identical with light modulated, after amplifying, pre-amplification circuit send filtering circuit, this filtering circuit only allows useful light modulated electric signal pass through, and the electric signal that the background noise that does not add modulation produces is filtered, and removes electrical noise through de-noising circuit more afterwards and must handle for further by pure useful electric signal.

The chromatic dispersion device that the technical program is addressed can adopt dispersing prism that the light of two kinds of different wave lengths is separated; Also can adopt the chromatic dispersion grating to reach same purpose.

The photoelectric conversion device of addressing in the technical program is made up of slit and photoelectric tube.Slit width can be adjusted according to its size of width of laser image spot, thereby can just in time allow flashlight pass through, and stops to fall parasitic light.Useful signal light by slit is by receiving near thereafter photoelectric tube, send electrical system to handle after converting electric signal to.

The infrared light gatherer of addressing in the technical program is a diffuse reflection cavity, coating black diffuse reflection coating in the chamber, and there is an opening cavity below.Before the flashlight addressed receive and handle imaging object lens in the optical system and on back focal plane, obtain two hot spots and resemble, one is that the useful signal hot spot resembles, one is that useless infrared laser hot spot resembles.Useful signal light is received by photoelectric tube by slit, and useless infrared laser just the opening by the infrared light gatherer enter in the diffuse-reflective cavity of gatherer through being absorbed after the diffuse reflection many times.

The used optical system of the technical program is arranged according to the request for utilization difference, can be designed to reflective structure, also can be designed to the transmission-type structure.Reflective structure is that aforesaid infrared semiconductor laser and optical beam transformation focus optical are unified that flashlight receives and handled coexist one side of bank note of optical system, both optical axises are angled, two optical axes crosspoints are positioned at note surface, two optical axises can be in a symmetrical arrangement with respect to the bank note normal also can asymmetric arrangement.And the transmission-type structure, promptly infrared semiconductor laser and optical beam transformation focus optical are unified, and flashlight receives and handle the both sides that optical system separately is positioned at bank note.The utlity model has following characteristics:

1. identification counterfeit money speed is fast and corresponding identification signal output is arranged, and can be advantageously used in the various automatic finance devices, also monetization Discr. separately.

2. identification counterfeit money rate is very high.

The utility model accompanying drawing is as follows: Fig. 1 the utility model optical schematic diagram (reflective structure, the chromatic dispersion device is a dispersing prism) Fig. 2 the utility model optical schematic diagram (transmission-type structure, the chromatic dispersion device is a dispersing prism) Fig. 3 optical schematic diagram shown in Figure 1, the chromatic dispersion device is the structural drawing that schematic block circuit diagram Fig. 5 the utility model of chromatic dispersion grating Fig. 4 the utility model use adopts the sensor of Fig. 1 optical texture.

Below in conjunction with accompanying drawing 5 and all the other description of drawings specific embodiment of the present utility model.The optical principle of present embodiment as shown in Figure 1.Referring to accompanying

drawing

5,9 is infrared semiconductor laser, it is fastened on, and incorporating mill shell 16 connects in order to heat radiation on the copper billet, 10 is the optical beam transformation parts, link to each other with casing 16 by nut, in optical beam transformation mirror group 8 is arranged, this optical beam transformation mirror group is collected light beam and the collimation that infrared semiconductor laser sends with large aperture angle, 11 is the focus lamp group, in focus lamp 7 is housed, it can make 8 collimated laser beams that obtain focus on, and 11 link to each other with 10 by screw thread, and rotation 11 can make the axis of focus lamp along 10 move up and down so that obtain the laser spot size of the best on bank note.This laser facula inspires visible light on bank note 6 specific regions.Among Fig. 5 18 is the receiving objective assembly, in receiving objective group 5 is housed, the visible light that this receiving objective group of received laser excites on bank note.Among Fig. 5 11 and 18 axis are in a symmetrical arrangement with respect to the normal of bank note, 60 ° of both angles.Receiving objective group 5 among Fig. 5, its front focus and bank note overlap.So useful visible signal light of receiving and all be collimated into directional light through receiving objective group 5 through the useless infrared laser of bank note scattering, dispersing prism assembly 17 is installed in this parallel light path, 60 ° of dispersing prisms 4 are housed in this assembly, and its angle of incidence of light is 48 °.The different wave length directional light separates an angle in the space after the dispersing prism chromatic dispersion, 3 among Fig. 5 is the imaging objective lens, and the light beam that penetrates from Fig. 5 dispersing prism 4 is through the slit mouth imaging of imaging object lens 3 at Fig. 5 slit arrangement 2.For the size of dwindling optical sensor shown in Figure 5 is provided with two

reflective mirror groups

13 and 14 between Fig. 5 imaging objective lens 3 and slit arrangement 2.They make imaging objective lens outgoing beam through the slit mouth place's imaging on slit arrangement 2 behind two secondary reflections, and the slit arrangement 2 among Fig. 5 is installed in the top of casing 16, and its slit mouth width can be according to the size adjustment of hot spot elephant.Among Fig. 5 and slit arrangement 2 parallel connections be infrared light gatherer 15, it is a black diffuse reflection cavity, and an opening is arranged, will be through repeatedly attenuating after the diffuse reflection in cavity after useless infrared light enters.In order to make useful flashlight pass through 2 slit mouth, useless flashlight enters the infrared light gatherer, can reach by adjusting reflective mirror group 14.Photoelectric conversion component 19 is installed on slit arrangement 2, photoelectric tube 1 is housed in the assembly, it receives the flashlight by the slit mouth, and send electrical system to handle after opto-electronic conversion, and the electrical system block diagram as shown in Figure 4.

As mentioned above, Fig. 5 receiving objective group 7 received light signals are excited on bank note by infrared laser and obtain.Therefore, signal is very weak.And simultaneously also had irreflexive infrared laser and useless veiling glare such as daylight, light on the bank note by what object lens received.In the unwanted light, infrared laser can remove by the dispersing prism among Fig. 54, and visible light such as daylight and light and useful signal light are all received by the photoelectric tube among Fig. 51, thereby can disturb useful signal.Therefore, semiconductor laser driving among Fig. 4 and modulation circuit 24 employings have the certain frequency modulating wave modulates infrared semiconductor laser 9, makes its output have the light modulated of certain power and frequency.This modulated laser impinges upon the visible using light that inspires on the bank note and has the frequency same with irradiating laser.The light signal that this is useful, receive and be converted into electric signal through photoelectric tube, send the feeble signal pre-amplification circuit 20 among Fig. 4 to amplify, useful signal is chosen in 21 filtering of filtering circuit in Fig. 4 again, remove undesired signal, remove electrical noise through de-noising circuit 22 again and obtain pure useful electric signal, further carry out power amplification through power amplifier 23 and make signal have certain driving force, thereby can promote the purpose that the function corresponding device reaches the identification currency true and false.

Claims

1. a Renminbi laser truth identification device receives and handles optical system, photoelectric conversion device, infrared light gatherer, semiconductor laser driving and modulation circuit, pre-amplification circuit, filtering circuit, anti-click circuit and power amplification circuit by infrared semiconductor laser, optical beam transformation Focused Optical system, signal and forms.It is characterized in that: be provided with chromatic dispersion device (4) in the light path between receiving objective (5) and the image-forming objective lens (3).

2. Renminbi laser truth identification device as claimed in claim 1, it is characterized in that: the luminous point of the front focus of described collimating mirror group (8) and infrared semiconductor laser (9) overlaps and has large aperture angle, and focus lamp (7) and (8) are adjustable with optical axis its spacing.

3. Renminbi laser truth identification device as claimed in claim 1, it is characterized in that: its front focus of described receiving objective (5) is near bank note (6), and the back focal plane place of image-forming objective lens (3) is provided with broad-adjustable slit (2) and infrared light gatherer (15).

4. Renminbi laser truth identification device as claimed in claim 1 is characterized in that: the drive signal that described semiconductor laser drives and modulation circuit (24) is added on the infrared semiconductor laser (9) is a modulating wave.

5. Renminbi laser truth identification device as claimed in claim 1, it is characterized in that: described chromatic dispersion device (4) can be a dispersing prism, also can be the chromatic dispersion grating.

6. Renminbi laser truth identification device as claimed in claim 1 is characterized in that: infrared semiconductor laser (9), collimating mirror group (8), focus lamp (7) and receiving objective (5), chromatic dispersion device (4), image-forming objective lens (3), slit (2), photoelectric tube (1) can coexist bank note (6) one side constitute reflective work structuring.

7. Renminbi laser truth identification device as claimed in claim 1 is characterized in that: described infrared semiconductor laser (9), collimating mirror group (8), focus lamp (7) are placed in one side of bank note (6); Receiving objective (5), chromatic dispersion device (4), image-forming objective lens (3), slit (2), photoelectric tube (1) are placed in the another side of bank note (6), constitute the transmission-type work structuring.