CN101203892A - Authentication by means of geometric security features - Google Patents
Authentication by means of geometric security features Download PDFInfo
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- CN101203892A CN101203892A CNA2006800225333A CN200680022533A CN101203892A CN 101203892 A CN101203892 A CN 101203892A CN A2006800225333 A CNA2006800225333 A CN A2006800225333A CN 200680022533 A CN200680022533 A CN 200680022533A CN 101203892 A CN101203892 A CN 101203892A
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- magnetic
- test coil
- voucher
- detection signal
- trajectory path
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Abstract
A method of authenticating value documents has following steps: a. providing a document (30) to be checked for authenticity; b. providing a high-frequency magnetic excitation field; c. providing a trajectory path (24) for checking the document (30); d. providing a detection coil (26); e. the detection coil receiving a detection signal when the document (30) follows the trajectory path (26); f. deriving geometric parameters from the detection signal; g. comparing the geometric parameters with the geometric parameters of a genuine value document.
Description
Technical field
The present invention relates to method that valuable papers is identified.If valuable papers is genuine, then comprise be dispersed among the predetermined or pre-selected locations of valuable papers or on the full particle of abampere.
Background technology
Being used in combination the full particle of abampere in valuable papers is that the crowd knows.US-A-5992741 has disclosed soft magnetism or the medium-soft magnetic fiber that is used in combination geometry in particular in the valuable papers such as banknote or credit card.
US-A-5992741 has also disclosed and has been used for detecting the method that whether has magnetic fiber in valuable papers.Disclosed detection method is based on the analysis that harmonic wave exists in the detection signal.
US-A-6707295 has disclosed the another kind of method that valuable papers is identified.Disclosed this method is based on the analysis to the dB/dt response signal, and this can draw the magnetic parameter such as magnetic coercivity or magnetic saturation.
Owing to forge the more imminent that becomes, require the protection of valuable papers is just become complicated more, for example, realize by making up various security feature.
Application WO-A-2005/105902 proposes security particles is only concentrated on the possibility of the predetermined or pre-selected locations of true valuable papers.
US-A-5,545,885 have disclosed and have been used for the coding pattern of magnetic region form is adopted in detection and Identification on banknote method and apparatus.These magnetic regions are the zonules with the ink printing that includes magnetic paint.
US-A-4,864,238 have disclosed the equipment that is used to measure low-intensity magnetic field.This equipment can be used for measuring the field relevant with banknote, with the value of money and the face amount of identification banknote.
US-A-5,808,466 have disclosed the magnetic material behavior processing that is used to verify voucher.This is handled and uses low-frequency signal emitter.At the magnetic material of ad-hoc location in the voucher, the waveform of detection signal is analyzed.
Summary of the invention
The invention provides the method that is used for the verifying valuable voucher security particles true and false and security particles tram.
According to the present invention, provide the method that valuable papers is identified.Valuable papers, if really talk about, comprise be dispersed among the valuable papers precalculated position or on the full particle of abampere.
Said method comprising the steps of:
A) provide and test so that the voucher of identifying;
B) provide the high frequency magnetic excitation field;
C) be provided for checking the trajectory path of voucher;
D) provide magnetic test coil;
E) when voucher when trajectory path is advanced, magnetic test coil receives detection signal;
F) draw geometric parameter by detection signal;
G) geometric parameter of geometric parameter with true valuable papers compared.
When geometric proportion than g) for certainly the time, then conclusion is true.
In the context of the present invention, term " valuable papers " is often referred to banknote, credit card, passport, bond etc.
Term " magnetic " expression magnetic material shows non-linear BH curve under the effect of alternating excitation fields H.Magnetic material refers to that preferably the magnetic coercivity is lower than the soft magnetic material of 100A/m (recording under nearly DC or the low frequency condition) and the magnetic coercivity is higher than 100A/m (recording) under nearly DC or low frequency condition medium-soft magnetic material.
Term " particle " refer to can among valuable papers's substrate or on the small components that is used in combination.Term " particle,, refer to that also diameter arrives the fiber of 20mm scope at 1mm to 30 mu m ranges and length at 1 μ m.
Term " high frequency " refers to be higher than the frequency of 1000Hz, for example, is higher than 3000Hz.Frequency is high more, and detection speed is also just fast more.
In certain embodiments of the invention, one or more magnetic test coils can be different along the winding closeness of the trajectory path setting of voucher.
Statement " along the different magnetic test coil of trajectory path winding closeness " refers to the combination of magnetic test coil or a plurality of magnetic test coils, wherein along the number of windings difference of trajectory path per unit length.
The simple embodiment of the magnetic test coil that the winding closeness is different is that magnetic test coil has winding along a part of trajectory path, and does not have winding along another part trajectory path.Another embodiment is that the distance between the winding is different continuously, for example, realizes by changing the thickness that insulate between the winding.
For step f), can obtain different geometry or physical parameter by detection signal.
As first possible case, can determine the amplitude peak of detection signal, this obtains by the peak width that has the magnetic particle is measured.
As second possible case, after detecting the edge of valuable papers, can determine the horizontal ordinate of the amplitude peak in the detection signal.As after this describing, this horizontal ordinate is used for measuring whole process or the mean place or the position of the full particle of voucher abampere.
The 3rd possible case is that the waveform of detection signal is analyzed.As after this describing, whether exist time maximum (sub-maxima) and time minimum (sub-minima) and each amplitude or amplitude difference can show the position width of the full particle of abampere.
Except that obtaining various geometric parameters, also can draw a plurality of magnetic parameters from detection signal.
Method for optimizing is to determine the amplitude peak of detection signal.This amplitude is used for measuring the concentration of valuable papers's magnetic particle.Concentration is high more, and amplitude is just big more.Determine the true and false of valuable papers can be not based on whether there being security particles, and based on the security particles that whether exists in the selected concentration range.
Perhaps, or in addition, can determine and the corresponding exciting current of amplitude peak.This exciting current is used to measure the coercivity of magnetic particle, and can represent the true and false of valuable papers.
Obtained by detection signal among the embodiment of geometrical property and magnetic characteristic, preferred embodiment only allows to be when sure with the magnetic comparison of true voucher with the geometric proportion of true voucher, and drawing is the sure conclusion of true voucher.If magnetic is relatively for negating, if or geometric proportion comparatively negative, or when all expression was negated, decidable was false voucher.
The method according to this invention can be used for note distribution machine (bank note sorting machine), paper money counter, the device that issues bank notes, Vending Machine, is used to device of identifying by credit card etc.
Description of drawings
Fig. 1 shows the BH curve of magnetic material;
Fig. 2 shows sinusoidal magnetic field that applies and the magnetic response that records from magnetic material;
Fig. 3 shows and is applicable to the pick-up unit of realization according to detection method of the present invention;
Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 and Figure 10 all show the continuous response signal of being caught during by pick-up unit as the valency voucher;
Figure 11 shows omnidistance response signal;
The parameter that Figure 12 shows a plurality of omnidistance response signals and draws thus;
Figure 13 shows the optional embodiment of pick-up unit; And
Figure 14 shows another embodiment of pick-up unit.
Embodiment
Fig. 1 shows the so-called BH curve of the magnetic material (that is the magnetic material that, has non-linear magnetic hysteresis phenomenon) in the situation of the present invention.Horizontal ordinate is to be the magnetic field H of unit with amperes per meter (A/m), and ordinate is to be the magnetic induction density B of unit with tesla (T) or oersted (Oe).Parameter of magnetic characteristic has, coercive field Hc, the magnetic field during its expression magnetic response vanishing, and saturation value, the magnetic induction density of its expression when saturated.
Now referring to Fig. 2.Particles of magnetic material to valuable papers inside applies sinusoidal magnetic field 12.The magnetic response dB/dt that records (time diffusion of magnetic induction density B) obtains two peak values 14.
Fig. 3 schematically shows the pick-up unit 16 that is suitable for realizing according to detection method of the present invention.For purposes of illustration, only show magnetic test coil 20 and 22.To test so that the voucher of identifying by the direction guiding of arrow 24 along trajectory path.Along this trajectory path, the closeness of winding 26 is also non-constant, but has a mind to make it to change to some extent.Roughly, along trajectory path can be different with rear region:
I) at first, there is not winding;
The right winding 26 of ii) right magnetic test coil 22;
Iii) the centre of magnetic test coil 22 does not have winding
The left winding 26 of iv) right magnetic test coil 22;
The right winding 26 of v) left magnetic test coil 20;
Vi) the centre of magnetic test coil 20 does not have winding;
The left winding 26 of vii) left magnetic test coil 20.
Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 and Figure 10 all show the successive stages that valuable papers 30 advances along track 24.
If voucher 30 is genuine, then comprise the predetermined and preselected area 32 that can not expand to valuable papers's 30 whole volumes and be scattered with the full particle 34 of abampere.Voucher 30 is advanced from right to left along trajectory path 24.Apply high frequency magnetic field.
Fig. 4 shows voucher 30 to begin to advance along track 24.When beginning to advance,, do not detect any dB/dt signal 14 because right magnetic test coil 22 can't detect the existence of security particles 34 at every turn.Voucher 30 is during near the right winding 26 of right magnetic test coils 22, because voucher 30 is advanced closelyer, and the closeness of winding 26 becomes close, then begin to detect dB/dt signal 14, and amplitude can increase.
Fig. 5 shows subordinate phase.The presumptive area 32 of security particles 34 advances to the right winding 26 of the right magnetic test coil 22 of next-door neighbour.The amplitude 14 of dB/dt detection signal shows maximal value.
Fig. 6 shows the phase III.The presumptive area 32 of security particles 34 advances to the core of the right magnetic test coil 22 of next-door neighbour, does not have winding in described central part office.The amplitude 14 of dB/dt detection signal shows minimum value.
Fig. 7 shows the quadravalence section.The presumptive area 32 of security particles 34 advances to the left winding of the right magnetic test coil 22 of next-door neighbour, and only after the right winding of left magnetic test coil 20.Two windings show the winding very dense, and in the number of windings quantity set.The amplitude 14 of dB/dt detection signal shows bare maximum.
Fig. 8 shows five-stage.The presumptive area 32 of security particles 34 advances to the core of the left magnetic test coil 20 of next-door neighbour, does not have winding in described central part office.The amplitude 14 of dB/dt detection signal shows minimum value.
Fig. 9 showed for the 6th stage.The presumptive area 32 of security particles 34 advances to the left winding of the left magnetic test coil 20 of next-door neighbour.The amplitude 14 of dB/dt detection signal shows local maximum.
Figure 10 showed for the 7th stage.The presumptive area 32 of security particles is left the left winding of left magnetic test coil 20.Amplitude 14 performance of dB/dt detection signal reduces, until being zero.
Figure 11 shows the global result of all each successive stages.Curve 40 expression survey the envelope of curve of dB/dt amplitude 14 to some extent.Curve 40 can be used for drawing magnetic and the geometric parameter of being identified voucher.
Figure 12 shows the enveloping curve 40,40 ' and 40 of a plurality of types ", and show a plurality of values that can draw from these curves.
The narrower presumptive area 32 that curve 40 ' and security particles 34 are occupied than the zone 32 of the voucher of formation curve 40 big and also than formation curve 40 " the zone 32 of voucher want narrow voucher corresponding.Curve 40 ' remains on curve 40 and curve 40 substantially " between.In any case, each curve 40,40 ' and 40 " show the geometric widths that detection signal 40 (substantially as the magnetic detection signal) provides the presumptive area 32 of security particles 34 and represent.
Can draw following parameter by enveloping curve 40:
-in whole amplitude peaks 42 of track 24 upper curves 40; This amplitude shows the concentration of security particles 34; Concentration is high more, and amplitude 42 is just big more;
The abscissa value 44 of-amplitude peak, this horizontal ordinate 44 show (on average) position of presumptive area 32 in valuable papers 30;
-peak-valley difference 46 (or between local maximum and the local minimum poor); As above with reference to curve 40,40 ' and 40 " described, this peak-valley difference 46 shows the width of the presumptive area 32 with security particles 34.Enveloping curve 40 shows two peak-valley differences 46.Can adopt wherein any one value, or preferably, adopt the mean value of these two values, because this is the parameter that has more robustness.
-peak value 48 (or local maximum 48) as peak-to-valley value 46, can be represented the width of presumptive area 32.The absolute value 48 of crest also depends on magnetic parameter.
After these four parameters, also can draw other parameters.An example is, with peak response amplitude 40 corresponding exciting currents.This exciting current is represented coercive field Hc.
Also can check, and compare with the maximum and the minimum value of true voucher response signal to the complete procedure of enveloping curve 40.
By making each true voucher 30, and determine the maximal value and the minimum value of each magnetic and geometric parameter, thereby pick-up unit 16 is calibrated by pick-up unit 16.
After this calibration process, device 16 just can be used for identifying.When only conforming to how much limit ranges with magnetic, then assert it is true voucher as if voucher by it.
Except that pick-up unit 16, or, can use optional embodiment as shown in figure 13 as the option means of pick-up unit 16.This optional embodiment is printed circuit board (PCB) (PCB) 50 or the PCB layer that is additional to other layers.This PCB for example has 5 elongations and relatively thin magnetic test coil 51,52,53,54 and 55.These 5 magnetic test coils 51,52,53,54 are parallel with trajectory path 24 with 55.In case detect when having security particles near each coil, each magnetic test coil 51,52,53,54 and 55 all can provide response signal.Therefore, this embodiment has such advantage, that is, be not the width of estimating presumptive area 32, but estimates the height of presumptive area 32.Thin coil quantity is big more, and is just high more to the estimated accuracy of presumptive area 32 height.
Another embodiment of pick-up unit as shown in figure 14.In addition, except that pick-up unit 16, this embodiment can be used for its optional embodiment.These other embodiment are printed circuit board (PCB) (PCB) 60 or PCB layer.This PCB edge has extremely thin magnetic test coil 62 perpendicular to the direction of the trajectory path 24 of valuable papers 30.The thin characteristic of magnetic test coil 62 is represented along the width of the direction of trajectory path 24 very little, and it has such advantage,, has security particles 34 if detect in voucher that is, and very sharp-pointed signal then is provided.This acuteness of signal helps to adopt better mode to determine the width of presumptive area.
Claims (15)
1. one kind is used for method that valuable papers is identified, if described valuable papers is genuine, then comprise be dispersed among the described valuable papers precalculated position or on the full particle of abampere, said method comprising the steps of:
A) provide and test so that the voucher of identifying;
B) provide the high frequency magnetic excitation field;
C) be provided for checking the trajectory path of described voucher;
D) provide magnetic test coil;
E) when described voucher when described trajectory path is advanced, described magnetic test coil receives detection signal;
F) draw geometric parameter by described detection signal;
G) geometric parameter of described geometric parameter with the described precalculated position of true valuable papers compared.
2. method according to claim 1, described method comprises additional step:
H) when geometric proportion than g) for certainly the time, then conclusion is true.
3. according to any one described method in the claim of front, wherein said magnetic test coil is along the closeness difference of the winding of the trajectory path setting of described voucher.
4. method according to claim 1 wherein writes down amplitude peak, is used to measure the width in the zone that has the magnetic particle.
5. method according to claim 1 wherein detects the edge of valuable papers, the horizontal ordinate position of record amplitude peak, and described horizontal ordinate position is used to measure the position that has the full particle of abampere.
6. method according to claim 1 is wherein used the additional detected coil, at inferior maximum and time minimum existence described detection signal is scanned, and the difference between the amplitude of inferior maximum and time minimum is used to measure the width of the position that has the magnetic particle.
7. according to any one described method in the claim 1 to 3, the width of wherein said magnetic test coil is less than the size of described precalculated position along trajectory path, and the live part of described magnetic test coil is along the direction orientation perpendicular to described trajectory path.
8. according to any one described method in the claim 1 to 3, the width of wherein said magnetic test coil is less than the size of edge, described precalculated position perpendicular to the trajectory path direction, and the live part of described magnetic test coil is along the direction orientation that is parallel to described trajectory path.
9. wherein there is magnetic test coil such more than in method according to claim 8.
10. method according to claim 1 wherein draws magnetic parameter by described detection signal.
11. method according to claim 10 wherein compares the magnetic parameter of described magnetic parameter with true valuable papers.
12. method according to claim 11 wherein only is when sure in magnetic comparison and geometric proportion, drawing is the conclusion of true voucher.
13. according to the method for claim 10, wherein write down the amplitude peak of detection signal, described amplitude peak is used to measure the concentration of the full particle of abampere.
14. according to the method for claim 10, wherein be recorded in the exciting current at described amplitude peak place, described exciting current is used to measure the magnetic coercivity.
15. according to any one described method use in the note distribution machine in the claim of front.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05105577.0 | 2005-06-23 | ||
| EP05105577 | 2005-06-23 | ||
| EP05105578.8 | 2005-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101203892A true CN101203892A (en) | 2008-06-18 |
Family
ID=34940222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800225333A Pending CN101203892A (en) | 2005-06-23 | 2006-04-26 | Authentication by means of geometric security features |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101203892A (en) |
| ZA (1) | ZA200711057B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106780954A (en) * | 2016-12-01 | 2017-05-31 | 深圳怡化电脑股份有限公司 | A kind of method and device of paper money recognition |
| CN107369240A (en) * | 2017-07-10 | 2017-11-21 | 深圳怡化电脑股份有限公司 | A kind of paper money discrimination method, apparatus, computer and storage medium |
-
2006
- 2006-04-26 CN CNA2006800225333A patent/CN101203892A/en active Pending
- 2006-04-26 ZA ZA200711057A patent/ZA200711057B/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106780954A (en) * | 2016-12-01 | 2017-05-31 | 深圳怡化电脑股份有限公司 | A kind of method and device of paper money recognition |
| CN107369240A (en) * | 2017-07-10 | 2017-11-21 | 深圳怡化电脑股份有限公司 | A kind of paper money discrimination method, apparatus, computer and storage medium |
| CN107369240B (en) * | 2017-07-10 | 2020-03-27 | 深圳怡化电脑股份有限公司 | Paper money counterfeit discrimination method and device, computer and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA200711057B (en) | 2009-05-27 |
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Open date: 20080618 |