CN2122408U

CN2122408U - Paper money true-false discriminator

Info

Publication number: CN2122408U
Application number: CN91218370U
Authority: CN
Inventors: 莫保民
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-07-11
Filing date: 1991-07-11
Publication date: 1992-11-18

Abstract

The utility model relates to a device for identifying genuine and counterfeit money by an optical method. The existing device depends on the brightness difference and has poor reliability. The device consists of a continuous spectrum light source and a filter which is arranged in front of the light source and can absorb light with wave bands of 440-680 nm and separate light with wave bands of 320-440 nm and 680-820 nm. When the device is used, the bank notes are placed in front of the filter, and the colors of the reflection light spots on the surface of the bank notes or the transmission light spots penetrating through the bank notes can be observed to accurately identify the genuine bank notes and the counterfeit bank notes. Because the paper qualities of the genuine and counterfeit money are different, the light spot of the genuine money is red, and the light spot of the counterfeit money is light blue. The human eye has a high sensitivity to the contrast of the two colors.

Description

Paper money true-false identifying instrument

The utility model is that a kind of optical means of using is differentiated device true, counterfeit money.

Seen that bibliographical information is (as Chinese patent literature; Notification number CN2077569U) and occurred on the market, with the various banknote identification devices of optical means, its principle of work all is merely to utilize true, counterfeit money that ultraviolet reflection differences is shown, promptly only uses single band light.Differentiate that by such device what lean on can only be luminance difference, and do not have colour-difference.Because brightness is a kind of relative sensation, contrast sensitivity is not high, therefore differentiates authenticity of banknotes by it, and its reliability is lower.In addition, the light source of employing is that the Ultraluminescence fluorescent tube adds filter glass, and not only power consumption is big, and the UV radiation that has is strong, and often use may cause cutaneum carcinoma and damage eyesight.

It is reliable that the purpose of this utility model provides a kind of discriminating, easy to use, power saving and to the healthy harmless bank note tester of operator.

Principle of work of the present utility model is with optical filtering 440 to 680nm wave bands in the continuous luminescent spectrum all to be sponged, isolate 320 to 440nm(near ultraviolet raies, purple light) and 680 to 820nm(ruddiness, near infrared ray) two wave bands (seeing Figure of description 1), use this two wave bands irradiate light banknote again, different and discern it from the color of reflection of true, conterfeit note or transmission hot spot.

Because papery difference true, conterfeit note, counterfeit money is very strong to the reflection of 320-440nm wave band, and the 680-820nm wave band is had certain reflection, and is so its reflected light is the color mixture of the two, promptly light blue; Genuine notes are very weak to the reflection of 320-440nm, and 680-820nm is had certain reflection, and its reflected light color mixture is red.Human eye is very high to light blue and red contrast sensitivity, so very easily identification.

In addition, though counterfeit money is very strong to 320-440nm reflection, 680-820nm is had certain reflection, when the transmittance counterfeit money of these two wave bands, few to their absorption owing to counterfeit money, so transmitted light is still more intense, the color mixture of transmitted light still is light blue.Though and genuine notes are very weak to the reflection of 320-440nm, absorb strong, simultaneously to the absorption of 680-820nm very less so the transmitted light color mixture of two wave bands for still being redness.Test shows that the use transmitted light is viewed very, the counterfeit money color is viewed basic identical with the use reflected light.

According to above-mentioned principle of work and test findings, the structure of the utility model product is as follows: identifier is by a continuous spectrum light source and be arranged at said light source the place ahead, can sponge the 440-680nm wave band, isolate the optical filtering of 320-440nm and two band of light of 680-820nm and form.The color of during use, as long as the banknote that will differentiate places the place ahead of above-mentioned optical filtering, observing the flare of (or be used under the situation of paper money counter, by special sensing element " sensing ") banknote surface or seeing through the transmission hot spot of banknote gets final product.

Said continuous spectrum light source is preferably incandescent lamp.Also can utilize sunshine to be light source.

Preferably light source and optical filtering are placed in half magazine, and in half magazine, place the banknote of being differentiated, observe reflection or transmission hot spot by the fenestra of half magazine by human eye.

The method for making of the used optical filtering of the utility model the relevant books such as Optical Instrument Designing, measurement and material of the distribution of public publication, handbook (as " and optical measurement handbook, National Defense Industry Press, version in 1978) on the books, the genus prior art.The both available current material processing of such optical filtering also can be obtained by coating process.

Compare with prior art, the utility model has the advantages that identification result accurately and reliably, easy to use, and power saving, harmless to human eye.

Accompanying drawing 1 is wavelength one transmittance curve of the used optical filtering of the utility model (longitudinal axis is a transmitance, and transverse axis is a wavelength).

Accompanying drawing 2 is a kind of example structure synoptic diagram of the utility model.

Embodiment: see accompanying drawing 2, a kind of is the portable identifier of the energy with the dry cell.One end of one plastic casing 5 has viewport 1, and the other end is separated out battery case 6 by terminal block 7, puts the power supply of two batteries as incandescent lamp 4.Incandescent lamp 4 is furnished with a continuous spectrum reflector 2.Having on the lower side of optical filtering 8, the box 5 to allow irradiate light arrive the window on banknote 9 surfaces.3 is the button power switch.

Present embodiment is reflective.Use through reality, differentiate the true and false of bank note such as Renminbi, dollar, Hongkong dollar, rate of accuracy reached 100%.

Claims

1, a kind of forge or true or paper money identifier is characterized in that by a continuous spectrum light source and be arranged at this light source the place ahead, and the optical filtering of can sponge the 440-680nm wave band, isolating 320-440nm and two band of light of 680-820nm is formed.

2, identifier as claimed in claim 1 is characterized in that said continuous spectrum light source is an incandescent lamp.

3, identifier as claimed in claim 2 is characterized in that light source and optical filtering are arranged in half magazine, has the observation fenestra on half magazine.

4, identifier as claimed in claim 3 is characterized in that an end of box has the observation fenestra, and the other end is divided into battery case, and incandescent lamp is furnished with a continuous spectrum reflector, has on the box wall of optical filtering lower side to allow light be mapped to the window of banknote surface.