DE1524687C3 - Device for checking the authenticity of securities - Google Patents

Description

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difference a predetermined lower threshold device for checking the authenticity of securities

exceeds, because otherwise the counting circuits will not respond to a change machine 10 equipped with a

chen. Frame 11, on which a substantially horizontal

In particular, it is provided that the grid is fastened zontal guide rail 14, which is a at least 0.6 mm from the security parallel to 5 forms guide for a slide 12, with which this is arranged. The bank note to be checked is expediently entered into and into the device A limited area of the grid is pushed out of the photocell. To have enough play for the keyed. For this purpose, the test area can be reached at 1.6 mm. Slide 12 is its dimensions direction of movement of the security and 4.8 mm perpendicular to its direction of movement somewhat right to this direction of movement through a mask io ner than the height of the guide rail 14. The guide is covered. In a further embodiment of the invention guide rail 14 has a longitudinal groove 18 in has a tubular support for the grid a wedge which the slide 12 is inserted. This shaped sliding member on which the security slide 12 has a chamber 20 for receiving leads, thereby damaging the to be checked a banknote 22. This chamber consists of a Securities through the tubular carrier at 15 support plate 24 and a cover plate 26 with a Bringing the security up to the test surface facing lip 28, with which it is from is prevented. In a further embodiment of the inventors, the person operating the device is lifted there is the facility to x-ray the can. This cover plate 26 has an after Securities from an infrared light source, while front-facing eyelet 30, into which a pivot pin the photocell has a high infrared sensitivity - 20 32 engages in the slide 12. When the cover plate 26 shows. is opened, the lower surface of this eyelet 30 is used

The advantages achieved by the invention are best as a stop for the one to be inserted into the chamber

essentially consists in the fact that banknote 22.

The sensitive optical structure of the device The support plate and the cover plate have a large size was increased substantially and that the counting 25 larger numbers of at different intervals from the Light-dark effects with the relative movement of concentric bores arranged to one another of security and grid over a fixed - 34, which through the plates' .right angled to their Route takes place. The direction of movement of the photocell was "". Because of the big information Signal independent of the number of movements of these bores 34, the speed to be checked, so that costly tax-appealing banknotes are in very many places on their real orders can be omitted. check unity.

A preferred embodiment of the invention is shown in FIG. 1 the slide is full

application is inserted below on the basis of the drawing. Curse in this position

individually explained. It shows the bores 34 with corresponding bores 36

F i g. 1 a money changing machine with a 35 in a plate 38, which on the lower part of the guide

Device for checking the authenticity of security rail 14 is attached and spans this,

Ren in a schematic representation, partially in section. A control panel 40 is attached under this plate 38.

with the assigned control circuits, sets and carries a selected number of light

F i g. 2 a perspective illustration in enlarged-sensitive photocells 42, for example photocells

ßertem scale of the edition for the security paper 40 diodes or photoresistors, which in the holes

and the arrangement of the grid, 36 protrude. The number of these photocells that

F i g. 3 shows a section through part of the electrical features of the arrangement of the individual cells and their

from Fig. 2 along the line 3-3, arrangement can of course depending on the

F i g. 4 shows a horizontal section through FIG. 3 requirements when checking the document

along line 4-4 to represent the wearer of the 45. A suitable incandescent lamp 37 is used

Rasters with his mask,. - 'through the holes and through the to be checked

F i g. 5 the top view of an American bank note. the

1 dollar note in which the areas in the details of the

are indicated on the basis of the picture, but which for the purpose of the device are not the subject of the invention.

Verification of the authenticity can be checked, 50 A checking device 41 is used for the authenticity check

F i g. 6 a and 6 b the detectable light-dark on the frame 11 by means of suitable fastening parts 43 Effect when a grid that attaches the same number. This test device 41 has a Has lines per unit of length, as they are in the back tubular carrier 45, which up to just above the are arranged in the background of the image, reaches down a little over the bank note 22 to be checked. The deck die Note is moved, 55 plate 26 has two incisions 47 and 49 (Fig. 2),

F i g. 6 c an unclean light-dark effect, since they are so wide that the tubular support

the background of the picture is not original, so it cannot be pushed in without further ado, so that

is genuine, the end of the carrier over a selected point

FIG. 7 shows a block diagram to show how the bank note to be checked is pushed

which way this can be done by the 60 assigned to the grid. There can be one or two such incisions

Photocell received signal can be provided by counting circuits, namely two, if two such

is passed through in order to use an authenticity signal to be triggered test devices 41

sen, or if the user of the device does not know exactly

F i g. 8 is a diagram showing which side of the banknote must be checked. A

different in the light-dark signal, which is evaluated, 65 wedge-shaped sliding element 45 α is on the tubular

when checking original papers, imitation carrier 45 is attached to prevent the carrier from

and photocopies. ger hooks behind the edge of a banknote when the

1 shows a section through one that is pushed onto a slide 12. The tubular

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Carrier 45 is arranged in such a way that a negative test signal is given by the test device from the background of the image part of an American bank via the case. It has been found that a fluctuation slips away note. For example, it slides over the the α of about 5 to 7% of the line numbers per inch in dashed lines 47 and 49 α in F i g. 5, the grid opposite the lines on the bank note also represents areas of such a bank note. 5 is permissible in order to achieve the desired wide light-dark

The tubular carrier 45 carries at the lower end to produce kel-surfaces, which for the delivery of a

a grid 51, which are required close above the positive authenticity signal to be checked. From the-

the banknote 22 lies. It is assumed that this form of authentication

this grid 51 about 0.6 mm above the banknote 22, a one-dollar bill or a five-dollar bill

lies. At the other end of the carrier 45 a photographic note is to be checked with the same grid,

cell 53 arranged as FIG. 3 shows in detail. To confirm the authenticity with the light-dark-Ef-

The exact distance of the grid 51 from this fect, as described above, to obtain

Photocell 53 is not of great importance, the grid is apart from a special see-through

as long as the carrier 45 covers the area falling through the grid, as is particularly clear

Light transmitted from the photocell 53. A strong light- 15 F i g. 4 can be seen. The mask is here with the

source 55 sends its light beam 57 denoted by the numeral 51 b , while the free radar

Bank note 22 and the comparative sample 51 to the photo star part 51 only allows light to pass through. The dimensions

cell 53. of the free part of the grid 51 can be about 1.6 mm

The operating principle of the device utilizes the fact that the security is moving in the direction of movement and that the background of the image is spaced evenly at 4.8 mm perpendicular to this direction of movement. It has been found that this surface of the wheel has parallel lines running. For example, 51 has resulted in an exact authenticity check if, for example, the background behind the image of the lines on the banknote and on the George Washington grid on an American one by at most 5 to 7% of each other in the line dollar bill 120 lines per Inches in horizontal as well as in 25 numbers per inch, with also a vertical direction. The image background on a slight angular displacement between the banknote in the five-dollar bill has approximately 117 lines per inch slider and the grid 51 is possible, so that the horizontal and 75 lines per inch vertical lines in the background of the image do not exactly match the direction, while the background align on one of the lines of the grid 51. The angular ten-dollar bill of approximately 75 lines per inch in 30 ßige displacement of the banknote compared to the Ravertikaler and 75 lines per inch in the horizontal direction results in a small impairment of the healing direction. If, therefore, the grid has a parallel dark effect, but this shift has the same number of lines per inch as that must not be too large, so as not to cause the practically full one or the other of the parallel lines in the background to brighten the free part of the grid of the image of an American one dollar, 35 bring about. The authenticity signal depends on how a five-dollar or ten-dollar bill results, is described in detail, on whether there is a broad light-dark effect when the grid is either within the above-mentioned maximum with the one or the other group of non-conforming deviations is in alignment with the lines and is practically parallel to this free area of the grid (FIG. 4) with a relative density above the same. This shows particularly clearly 40 movement between the bank note and the grid is achieved. Fig. 6 a, in which an enlarged grid 51 α represents- If a measurement of the vertical lines in the Hinterpes.ellt is, which results in a dark area 59. If, as in FIG a light area in the previously dark area 59. 45, the lines in the opening 51 c perpendicular to the grid which, when run off in the detent opening 51 in the mask 51 b (FIG. 4). A fixed one is covered, the view through the opening 51 shows the or manually operated cam disk at the end of alternating dark and light areas. The use of the slide insert could for this purpose enable the counting of the number of light to deflect slides for this longitudinal movement in order to detect a dark signal, or in other words, to check the number of vertical lines. and dark areas when performing the grid. Or it could be used for this purpose 51 against the background of the bank note, the mask 51 b by 90 ° from the in FIG. 4 is presented, or vice versa. It has been shown posed position to be rotated. In certain cases on an American one-dollar bill or len, it may also be desirable to measure both that of another low-value banknote with a movement of only about 1.6 mm between the banknote's authenticity check. In each case in connection and the grid there are nine light and dark measurements with a measurement of the intensity difference of the light. As well as just a dark effect that is true to the naked eye.

acceptable difference between the number of lines in order to obtain an authenticity signal with the one shown in FIGS. 6 a to achieve the background of the image and the number of lines on 60 and 6 b shown light-dark effect, the grid is available, the light-dark area is provided that the light source 55 and the photo holes are not wide enough, to the desired full cell 53 are not actuated until the slide 12 light or dark areas in the opening of the is practically completely pushed. This will result in mask 51 b . Fig. 6c shows a spotted exposed that the touch of a microswitch light-dark training, which occurs when 65 90 a test circuit 96 with the grid 51 turns on, the lines in the background of the image are blurred which in turn the light source 55 and the photo or if its number per inch is switched on compared to the racel 53 in order to transilluminate the bank note 51 deviates by more than 5 to 7%. In this th and palpate while they are about the last

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Covered 3 mm of their inward movement until one fungus two would be sufficient. It may, however, dar-plunger 80 actuated by a solenoid 76 to indicate that, even if it becomes real, around the slide 12 in its inserted health test of the smaller American banknote position to hold on. It was found that four pulses were selected, the number of pulses to be counted during this last movement of the slide in FIG. 5 for the authenticity check depending on the position of about 1.6 mm the light-dark surface area can be varied.

Chen 59 according to FIG. 6 a and 6 b alternately as order the number of pulses in the signal with the cut-off in the free area of the grid essential waveform 109 logically include, are appear suitable Lolich more often than is provided for the implementation of real-cal circuits that would be required from the health check. There is a series of flip-flops called io. Here, a flip-light-dark-light-dark counts, which easily achieves two impulses on flop 69, one with the “set movement of the banknote in the short intervening zen” and the other with the “reset” in the room which initial position is intended for testing, the signals then being sent to a two, is sufficient to output the authenticity check to be carried out flip-flop 71, which two ren. In any case, the number of changes of the 15 further pulses can be counted . When four pulses of light and dark areas 59 have been counted independently of the cutting, a switch 73 is actuated in order to output the unauthorized movement of the slide 12 in the case of an authenticity signal. If no tampering is received, gnal is received after a certain

As a result, no expensive drives are released for a period of the pressure piston 80,
a constant speed or other synchronization, which is required with chronization devices around which one end is attached to the slide 12 and the desired formation of light-dark effects is hooked to the frame 11 at the other end , then pulls the slide back into the starting position by means of the grid in a given time, since the simple manual insertion of the bench causes the operator to delete all previously made tooth marks.

Relative movement between the banknote and the raster As mentioned above when specifying the maximum

Achieving a desired result generated. J sigen discrepancies between the number of lines

The evaluation is achieved by means of logical streams on the bank note and on the grid and in the case of the, which are shown in a highly simplified manner in detail in the representation of the permissible angular displacement between the block diagram in FIG. Here 30 banknote and raster have been executed, the photocell 53 emits an approximately sinusoidal signal indicating the 103 achieved by the comparison pattern 51, which shows the shape caused by the passage of light through light-dark effects by no means a perfect banknote 22 and raster 51. Blocking of the passage of light into the photocell 53. However, this result of the light-dark effect does not need to be a uniform sinusoid in the embodiment of the invention, of course, but the strength of the light-dark effects achieved shows ups and downs regardless of the th light attenuation of the greatest importance and the speed of movement of the slide opposite results in the second criterion for checking the grid. The signal 103 is then a pre-authenticity of securities. In Fig. 8, a typical amplifier 63 is fed in, in which the type of light-dark signals is amplified when a is checked and results in a waveform which is roughly the same as the original bank note, a forgery and a photo signal 105 above the same. The signal 105 is shown as a copy. As FIG. 8 shows, this shows that four complete light passages were felt at the top millivolt level for all signals, since there are four heights. This 75 mV. The big difference, however, results in the pre-amplified signal being a direct current under-dark signal, with the original banknote being fed in about pusher 65, in which the sinusoidal 45 results in 40 mV, while the imitation about 60 mV part of the signal 105 is separated and in · Wave and photocopy give about 70mV. Man form 107 is submitted. For this purpose, it is therefore only necessary to set a threshold value for the dark signal, which is generally known, conventional methods, which are reached for direct current suppression. Such methods are well known to anyone skilled in the art before the authenticity signal is triggered. The 50 can. In the example according to FIG. 8, the unSignal 107 could be transmitted to a pulse shaper 67 for the threshold value for the dark signal, in which each peak value of the alternating voltage is 50 mV. In other words, the voltage results in a brief, strong pulse, such as the preamplifier 63 of the circuit diagram according to FIG. 7 is represented by waveform 109 . This would also not respond and any signal from this pulse shaper 67 is known to any person skilled in the art, 55 unless the one which, apart from the specified circuit, uses such circuits to come down to the lower threshold value,
change the course of signals. This Si After a detailed full study of gnal 109 represents four voltage pulses, that is, Druckverfahens for original banknotes and one that through the screen door 51 51 b compared c in the mask with those in the production of Fälvier cut-off procedures fully observed and photocopies could be detected. The preceding signals 103 and 105 indicate that the results of FIG. 8 as a result of showing the passage of more than four surfaces, properties of these printed products at the store but it has been shown that it can be completely checked for authenticity. In practice, that is enough if only two impulses or two areas of total paper money around the world are detected with the, in order to print a usable authenticity-proof gravure printing process that gives off a wide signal. Hence, if the pulse shaper also gives range of shades. As a result of the high 67 being able to generate more than four pulses, only the costs and the complexity of gravure printing are counted as the first four

Flat printing carried out. In the flat printing process, the printing surface is at the same height or plane like the unprinted area, while with the letterpress process the printing area is relief-like is trained. Neither with book printing nor with flat printing can so much printing ink be deposited, and as a result these deep tints cannot be achieved as they can be achieved by releasing the Printing ink from the indentations under the flat surface in the gravure printing process be released.

The advantage of this pressure differentiation to achieve of signals according to FIG. 8 is used in that the difference in intensity of the light-dark effects the predetermined lower threshold value only in the case of bank notes produced using the gravure printing process exceeds. The difference in intensity of the light-dark effect can still be increased by that the light source 55 is operated with low voltage, so that it has a high proportion of infrared radiation gives away. The photocell 53 is then selected so that it is primarily infrared Radiation and low light intensities. Since the gravure printing process has more dye on the When the banknote is brought, more infrared radiation is absorbed, and the dark signal becomes ^ ird as a result, much darker than would be possible with white light, or if using the planographic printing process or the letterpress printing process would produce a first-class forgery.

The device for checking the authenticity of securities can easily distinguish between original banknotes and even excellent produced by the planographic printing process or letterpress printing process To distinguish forgeries, whereby an authenticity signal is triggered when the measured intensity difference the light-dark effects and the number of signals emitted by the photocell exceed the specified lower threshold values.

As already mentioned, controls the width or height of the opening in the direction of the bank note movement, which is predetermined by the mask SIb , the

ίο chiaroscuro effects while the length of the opening an angular change between the lines across the direction of the banknote movement in the bank note and the grid to a specified extent.

An authenticity signal is provided by the test circuit 96, which is connected to the power supply 74 via a line 94 is output via a line 98 to set a motor 56 in motion, which in turn sets a pair of rollers 91, 93 in motion and

ao removed from the chamber 20 by the bank note. With the full movement of the banknote 22 out of the chamber 20 actuates the leading edge of the banknote an arm 95 of a microswitch 97, which in turn a relay circuit 74 turns on to a desired

»Give 5 payment signal 77 for the change. A counter signal from the payment circuit switches the solenoid 76, releasing the piston 80 and withdrawing the slide 12. The engine 56 is pivotably mounted on a pin 57 so that a spring-loaded screw 59 through the frame 11 can bring rollers 91 and 93 into resilient contact with one another. The payout signal 77 stimulates a suitable payment mechanism.

For this purpose 3 sheets of drawings

Claims (5)

1 2 surface movably arranged device for patent claims: generation of a light-dark effect by means of a grid, from devices for transilluminating a 1. Device for checking the authenticity of part of the Wertpa securities provided with the line pattern, which at any point a 5 piers and the grid and for measuring the Intensi line pattern have, consisting of a difference in quality of the light-dark effect by means of a photo frame, in which a limited test area to the cell and from devices to receive the from Recording of the security in practically smooth electrical signals emitted by the photocell and Location is provided from one opposite to that to trigger an authenticity signal. Test surface movably arranged device io The invention lies in the checking of the to create a light-dark effect by means of the authenticity of securities. a grid, made up of devices for penetration, to create light-dark effects by means of light up part of the with the line pattern of a line pattern and a grid which is a provided security and the grid and has the line pattern complementary pattern and Measure the intensity difference of the light-dark 15 is arranged just above the line pattern. kel effect by means of a photocell, and from the device. The image of a light source is used to receive the type emitted by the photocell given electrical signals and for triggering through the test area illuminated security with- an authenticity signal, thereby identifying a lens and mirror on a spatial basis shows that the grid removed from the test surface 20 is mapped. The mirror is (45) movably arranged device as means of a driven control arrangement in an os- Transport device (12, 14) offset to the approaching and zilling movement, whereby a healing Removing the security to be checked (22) dark effect in the plane of the grid can be achieved. from the test surface that the grid is formed. This light-dark effect is caused by the photocell (51), which measured a line pattern of the value pa- 25 to which an electrical oscillating circuit was assigned. piers has a complementary pattern in which the test net is used to trigger the authenticity signal if a area with a small distance just above the number of light-dark signals per specified the value-time unit brought up to the transport device is measured (French patent specification paper is arranged, and that the devices 1 283 212). The disadvantage is that by using to receive the light losses caused by the photocell (53) from the lens and mirror, These signals have electrical counting circuits that measure the electrical output from the photocell. which affect the number of light-dark effects tough- see signals that through the spatial len, if the security is a specified distance from the security to be checked and radar A precise optical adjustment of the objective is shifted in relation to the grid and the difference in intensity of the light-dark Ef- 35 and mirror is required and that that of the fo- fect a predetermined lower threshold to cell output signal from the oscillation frequency exceeds. frequency of the mirror is dependent. As a result, these are 2. Device according to claim 1, characterized in that the device is working properly distinguishes that the grid (51) at least 0.6 mm complex measures, which are also a removed from the security (22) parallel to this 40 falsely triggering of the authenticity signal at pre-arranged is. cannot reliably prevent counterfeiting 3. Device according to claims 1 and 2, then. characterized in that a limited area The invention is based on the object of providing a of the grid (51) removed from the photocell (53) for checking the authenticity of securities is steady and the test surface (45) to 1.6 mm in 45 of the type described in such a way that Direction of movement of the security (22) and securities produced in gravure printing by means of a 4.8 mm perpendicular to this direction of movement photoelectric test is more reliable than previously recognized is covered by a mask (51 b) . will. 4. Apparatus according to claims 1 to 3, characterized in that this object is achieved by the invention that the characterized in that for the grid (51) a tubular 50 arranged to be movable relative to the test surface shaped carrier (45) is provided, which is a device as a transport device for approaching wedge-shaped Sliding element (45 a) has to guide and remove the security to be checked from tion of the security to be checked (22) at the breakfast area is formed that the grid, wel-lead of the security (22) to the test check an area to complement the line pattern of the security (45). 55 zendes pattern has, in the test area with low 5. Apparatus according to claims 1 to 4, characterized in the distance just above that of the transport device, that the light source (55) is arranged for the device brought up security, and transillumination of the security (22) from one that the devices for receiving the from the Infrared light source consists and the photocell photocell emitted signals electrical counting circuits (53) has a high infrared sensitivity. 60, which represent the number of light-dark areas count when the security falls a certain distance from the reference sample. The invention relates to a device for checking is pushed and the difference in intensity of the healing the authenticity of securities which have a predetermined lower limit on any dark surface A line pattern consisting of 65 exceeds the threshold value. a frame in which a limited test area according to the invention is therefore a prerequisite to record the security in practically smooth for the known measurement of the intensity difference of the Location is provided, from a comparison of the test light-dark effect that the measured intensity