CN1164288A - Security thread detector assembly - Google Patents
Security thread detector assembly Download PDFInfo
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- CN1164288A CN1164288A CN95196321A CN95196321A CN1164288A CN 1164288 A CN1164288 A CN 1164288A CN 95196321 A CN95196321 A CN 95196321A CN 95196321 A CN95196321 A CN 95196321A CN 1164288 A CN1164288 A CN 1164288A
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Abstract
A security thread detector assembly for reading a security thread (1) carried by a security document and coded such that each of a succession of segments along the thread represents a digital value, the particular digital value being represented by the particular characteristic of the respective segment comprises a head (3) having a multiplicity of parallel reading channels (8) having a track pitch which is substantially less than the length of a segment and being disposed to read the document such that the thread (1) is substantially broadside to the channels, whereby all the segments are sensed substantially simultaneously and each segment is represented by a plurality of samples.
Description
The present invention relates to relate more specifically to be used for the detector module of read line such as the coding safety line that is used for bank note or other secure file, this line is provided as broadside and reads, thus can be roughly the various piece of read line simultaneously.
Generally in bank note or other secure files, provide safety line now.Originally, safety line is a simple metal line, yet, according to the current practice this line being carried out magnetic code, this line generally includes the lamination of a long and thin polyester strip and middle magnetic track.The magnetic code of bar is preferably digital, is generally scale-of-two, and usually magnetic track is that section by a series of related optional network specific digit values constitutes, and the length of section i.e. " position is long " is constant, is typically about 2mm.The example of such magnetic line is open in BrP GB-B-2098768 and European patent EP-B-0407550.Operable other magnetic line of the present invention are open in EP-B-0310707 and EP-A-0428779.The ad hoc approach of different digital value representation can be different.For example, in the particular case that EP-B-0407550 describes, its characteristics of section of expression one " 0 " are not for there being magnetic material, and what represent a binary one section is by existing magnetic material to constitute.Like this, according to the numerical coding of line, magnetic track can be by comprising one or more magnetic material sections or not having the length of the section of magnetic material to constitute.Yet, the present invention is not limited to use a kind of like this line, the reading machine that comprises threshold dector as possible can be distinguished the characteristic of different sections, just can use other forms that digital value represents, thick such as different lines, different live widths or other different magnetic characteristics.It should be noted that between adjacent segment, needn't have and to differentiate the border, although between coded word, can realize the suitable establishment of numeral output by the use end code.
Up to now, read a magnetic track by detector module and think necessary about moving this line along the length direction of magnetic track with big mobile component.This technical merit is known, for example, and in EP-A-0413534.This is a real drawback, because people have been accustomed to for rectangular bank note or secure file provide one to extend to the safety line of file bottom from Top-of-file, thereby this safety line is parallel with the minor face of file.Therefore, if must vertically read this line, then must be so that the form feed documents on long limit at first to be provided.
EP-A-0413534 has described a kind of examination of repaying that alleviates above difficulty, and reading machine and this bank note of having described the bank note that is used to have parallel safety line from top to bottom with minor face simultaneously are the leading reading machines that offers of minor face.The scheme that EP-A-0413534 proposes is to use a detecting device, and this detecting device is generally 45 ° from an actual acute angle, extends to the bank note portable cord, and this portable cord and this safety line meet at right angles.This is a clumsiness and quite invalid scheme.
The present invention is based on one and can read the thread detector assembly that broadside offers the line of codes of detecting device, even consider that the part of this safety line tilts, thereby roughly simultaneously and read the various piece of this line concurrently.Another object of the present invention provides a stature detecting device, and this detecting device can provide the more accurate detection of coding by means of a plurality of samplings.
According to an aspect of the present invention, line of response with respect to assembly with the roughly rectangular direction of line on move, the suitable magnetic line detector module that reads by the magnetic security line that comprises a series of coding sections of secure file carrier band, comprise a plurality of passage magnetic heads, wherein path clearance length direction along the line is less than one section length, thereby will be read all the section roughly read simultaneously, and each the section read by a plurality of passages, thus each the section by a plurality of sampled representation.
This structure of assembly has employing the wide magnetic head of a plurality of independent fetch channels usually.Path clearance, i.e. track pitch, the center to center gap of passage more generally may be selected to be the part of one section standard length.For example, track pitch is 1/4th or integer/one similarly that path clearance can be standard paragraphs length.Like this, if the length of section is generally 2mm, then path clearance can be 0.5mm in the head stack.Production with hyperchannel head assembly of path clearance like this is that the those of skill in the art in for example multiple audio recording field are competent.
More specifically, the invention provides a security thread detector assembly that is used to read by the safety line of secure file carrier band, this safety line is encoded to along each segment table in a series of segments of this line equal length shows a digital value, this optional network specific digit value is represented with the particular characteristics of correspondent section, described assembly comprises having a plurality of heads that read in parallel passage, in fact the track pitch of passage is less than one section length, and in fact this assembly is configured to provide file with the broadside of line to passage, thereby the section that all sections that will be read are read haply simultaneously and each reads is by a plurality of sampled representation.
Fig. 1 is with the essential characteristic of sketch formal specification detector module according to the present invention;
Fig. 2 is the schematic diagram of detector module, relevant prime amplifier and treatment circuit;
Fig. 3 is the more detailed schematic diagram of the treatment circuit of the single passage of related detection device;
Fig. 4 illustrates reading head and directly correlates the physical configuration of parts; And
Fig. 5 explanation is used to mention the technology of coded data word.
In Fig. 1, when safety line 1 broadside is shifted to detecting device, direction shown in the arrow A, safety line 1 will be read by multiple track magnetic head 3.Just in the broadest sense, be that detector module moves or safety line moves or the two to move be unessential, although detecting device is fixed and with the form of bank note and the reading machine quadrature that comprises detector module the safety line 1 that is generally a bank note part and preferably embeds bank note is offered detector module usually.Wherein this line parallel with minor face from the bank note top until the bottom, this bank note is preferably with the leading reading machine that offers of a minor face according to the present invention.
Detector module comprises a magnetic head with a plurality of read channels that are arranged side by side.Several passages only are shown among the figure; Usually detecting device has enough passages covering the whole length of bank note center line, and path clearance is far smaller than the standard paragraphs length in the safety line 1, and this path clearance is preferably the part (such as 1/4th) of standard segment length in the safety line." path clearance " or " track pitch " is often referred to interchannel center to center gap.Each passage will comprise that has a suitable magnetic core component that reads the non-magnetic gap of bar; The adjacent magnetic core component of the known practice according to structure multiple track head stack separates with non-nonmagnetic protective layer usually.
The detector module that generally is used for bank note has 192 parallel channels side by side, and bank note adopts the standard paragraphs length of 2mm, and the track pitch of passage is 0.5mm.
This individual passage is connected to treatment circuit 7 by parallel connecting line 6.These treatment circuits can comprise prime amplifier and signal adjustment circuit, and signal adjustment circuit will be converted into the digital sample part of the magnetic track of being read by respective channel from the analog waveform that each independent magnetic head receives, and be preferably the binary digit sampling.Generally, the main signal output of the sense coil on the magnetic core component of part passage during by change gap of the section that is made of magnetic material will be an analog waveform that comprises an inceptive impulse and a rp pulse.There is not the part main signal of magnetic material very low mostly or do not exist, certainly, represent different binary values if adopt different magnetic material or characteristics, from the amplitude of the main signal of passage with difference and can separate by suitable threshold, perhaps Discr. of each passage or based on timesharing with less Discr. treatment channel signal.
Fig. 2 is the schematic diagram of critical piece, prime amplifier and the associated processing circuit of explanation read head.Read head 3 comprises that in the present embodiment 6,6 prime amplifier wiring boards 21 of connecting line (32 prime amplifier passages on every block of plate) of 192 pair cables are disposed in the bank note sorter by numeral 20 general explanations.For the present invention, the structure of bank note sorter is unessential, and mentioning the bank note sorter only is to be used to indicate normal context of the present invention.
Each prime amplifier is connected to via twisted-pair feeder and is positioned within the circuit carriers 23 corresponding signal that or another signal adjust on wiring board 24 and adjusts amplifier circuit.This support also comprises primary processor 25 and PSU26.Primary processor is connected to the miscellaneous part of bank note sorter via I/O interface 27 and serial transmission line 28, and for purpose not related to the present invention, primary processor also is connected to computer console by bidirectional linked list circuit 29.
Fig. 3 explanation is read out the critical piece of the individual processing passage that stage of the degree that the digital sample of the magnetic state that produces that section or characteristic represents begins from a section of safety line 1.Line 1 is expressed as and comprises two adjacent segment 1a and 1b.This only is the seldom part of safety line.As previously mentioned, this line 1 is provided by broadside, arrives reading head 3 with reference to Fig. 3 with from left to right moving direction.As previously mentioned, this reading head comprises a plurality of passages, and the length of the path clearance section of being far smaller than wherein is such as section 1a and 1b.The sense coil 31 that is arranged on the magnetic core component of passage is connected (through twisted-pair feeder) to prime amplifier 33, usually the output 33a of prime amplifier 33 is analog waveforms, if this section is made of magnetic material, then this waveform comprises that an initial forward spiking is through short the delay with a negative sense spiking is arranged.Prime amplifier 33 is connected to signal by corresponding twisted-pair feeder and adjusts amplifier input terminal.Be provided with prime amplifier being amplified to a kind of like this degree from the signal of magnetic head so that can be through the differentially-wound line to being sent to usually treatment circuit away from reading head.
Prime amplifier can comprise a low-pass amplifier and a signal that is used to remove high frequency noise at input phase or output stage and adjust any DC component that amplifier can be removed the magnetic head signal.The magnetic head signal 34a of the amplification that is provided by amplifier 34 is fed to the negative input end of differential height to amplifier 35, the differential height is connected to positive threshold value reference termination 37 and signal to the pulse of amplifier 35 input and adjusts the output of amplifier 34 and can be connected to high positive input terminal to differentiating amplifier 36 equally, and high negative input to differentiating amplifier 36 is connected to negative threshold value reference termination 38. Amplifier 35 and 36 outlet terminal can interconnect and be coupled to positive reference termination 40 by resistance 39.
The purpose that comparer is installed is that the two provides threshold test for forward transient state and negative sense transient state.Exporting 39a from the result of a magnetic sections 1a is a dipulse that can be converted into individual digit sampling.In this example, will be not enough to reach by comparer 35 and 36 preset threshold from any signal of the scanning collection of section 1b (being provided with magnetic material), so its output will be zero.
Fig. 4 illustrates the physical configuration of head stack.This reading head comprises that one has the slender bodies 41 of a protrusion 42, leans on this protrusion, as utilizing conveying device that bank note is pushed as described in disclosed International Patent Application WO-A-95/27256 October nineteen ninety-five.The magnetic head passage has joint 43, and joint 43 is connected to the casing 44 that is used for prime amplifier through one group of twisted-pair feeder 6.
Usually, the multichannel output in the head stack after appropriate threshold value detects, comprises one group of binary digital signal of each section in the safety line.For example, if every section generally has 4 samplings, track pitch is that 1/4th, one section long track coding of position of this line is as 1010 ..., then can be by one group of parallel output signal 1111000011110000 ... expression.In practice, such one group of signal can divide into groups to check, nominally this is grouped on the number number corresponding to every section sampling, thereby derives the original coding of line.In this particular case, output signal can be with the grouping inspection of 4 samplings.Yet, usually since the slight position of magnetic section and fetch channel not just, particular segment may be used greater or less than the nominal number of sampling and represent.One section may be only adjacent segment may be with 5 sampled representation with 3 sampled representation.In addition, the sampling that is interrupted between the section of taking from may be incorrect or be not enough to reach the amplitude of detection threshold.Therefore, one group of parallel output signal from taking of reading of section coded word 1010 constitutes for the purpose of for example, may be 111 * * 0000111 * 000 ...In this expression, symbol X attempts to represent a unreliable or uncertain value.Yet, by checking sampling and using some tolerance criterion, can obtain the roughly correct structure of packet signal and recover the similar data extract routine of used data extract routine by serial binary data when noise is arranged and extract original coding, this is conspicuous to those skilled in the art.For example, the detection of 3 numerals of identical value (1) can be considered to be enough to represent original coding value (1) in a grouping or frame.The selection of every section number of samples and then path clearance and segment length's ratio, and represent that the original coding value detects the differentiation criterion between required enough and not enough number of samples, these are all by the deviser by oneself.
Fig. 5 illustrates a kind of form of correlator, and this correlator can be realized with hardware component or by programming in microprocessor, be used to detect this line and whether have the coding that mates with predictive encoding.
As the front indication, it is known being used to detect the various technology whether the optional network specific digit coded word that is easy to demote may occur.Robert C Dixon is " dispersing spectrum systems ", and Jonh Wiley publishes, and second edition (1984) has provided several examples in the 5th and 6 chapters.
In this example, thereby if use 192 signal indication 48 status of a sovereigns of 4 times of repeated samplings, single system comprises to be counted and determines this number whether in the actual number of bits margin tolerance of that binary value the figure place of a binary value, and that binary value should produce by the coded word that corresponding repeated sampling should occur.Another example is the number that calculates the position of same item in the grouping of per 4 positions, as mentioned above.
In Fig. 5, specify a more complicated pattern, wherein cumulative length is slightly less than a long coded word of magnetic head position (or a coded word is together with two ending segments) and searches for.
This group sampling of 4 times of repeated samplings at 48 phase ortho positions of expression is by feed-in first register 50.Second register 51 keeps the repeated sampling form of required coded word.For example, to n repeated sampling of a y numerical coding word, the length of second register is the ny position.Correlator compares the respective stage in each and the register 50 of baseline encoded word.Thereby this correlator can comprise ny and door, each with door be coupled in first register in the relevant position and second register relevant position or similarly exclusive-OR gate be connected, a totalizer of output of ny of adding up is all arranged in each case.The content of first register is heavily remembered with suitable high-frequency clock rate.If sampling is correct, the output of correlator (be called as under situation in addition convolution and) should reach the accurate coupling corresponding peaks with the ny position.In fact, thus this peak value and less than theoretical maximum and threshold value should be set can finish detection when convolution with when surpassing certain less than the threshold value of bare maximum.
Then can use other correlation techniques as if more desirable, for example the lag line correlator.
The above only is defined as explanation, and is not limited to this.For example, the length of section needn't be constant, just changes and can recover original coding by suitable programming data rejuvenation with preordering method as long as know length direction along the line.In addition, needn't read all sections,, be inserted with the end word in the middle of comprising the same-code word, finish the section just enough of words and this insertions coded word thereby read two particularly if the coding of line is repetition.
Claims (7)
1. magnetic line detector module, be applicable to line of response with respect to this assembly with the roughly rectangular direction of this line on move, read the magnetic security line (1) that comprises a series of coding sections by the secure file carrier band, comprise a plurality of passage magnetic heads (3), the path clearance of passage magnetic head length direction along the line is less than one section length, thereby all sections that will be read are roughly read simultaneously and each section reads thus each section by a plurality of sampled representation by a plurality of passages.
2. according to the assembly of claim 1, wherein be provided for by checking that sampling detects the apparatus for encoding of being shown by a plurality of segment tables.
3. security thread detector assembly, be used to read safety line (1) by the secure file carrier band, this safety line is encoded and makes that each segment table shows a digital value in the series of identical length section of direction along the line, the optional network specific digit value is represented with the particular characteristics of correspondent section, described assembly comprises that has a plurality of magnetic heads (3) that read in parallel passage, this reads in parallel its track pitch of passage roughly less than one section length and be arranged to the broadside of showing line greatly and provide file to passage, thereby all sections that will be read are roughly read simultaneously, and each section that reads is by a plurality of sampled representation.
4. according to the assembly of claim 3, a processor is installed wherein, to respond described sampling and to detect existing of the coding that shows by segment table.
5. read method by the safety line of secure file carrier band, this safety line be encoded as the series of identical length of direction along the line the section in each segment table show a digital value, the optional network specific digit value is represented by the particular characteristics of correspondent section, described method comprises uses a plurality of fetch channels side by side, its track pitch of this passage is roughly less than one section length, thereby the broadside of showing line greatly provides all sections that will be read of file roughly to be read simultaneously and each is read with a plurality of sampled representation section to passage.
6. according to the method for claim 5, comprise that also the data processing of carrying out this sampling is to detect the digital value of being shown by segment table.
7. according to the method for claim 6, wherein this data processing comprises whether a definite original coded word is shown by a plurality of described segment tables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95196321A CN1164288A (en) | 1994-11-18 | 1995-11-07 | Security thread detector assembly |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9423290.7 | 1994-11-18 | ||
| GB9423420.0 | 1994-11-19 | ||
| CN95196321A CN1164288A (en) | 1994-11-18 | 1995-11-07 | Security thread detector assembly |
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| Publication Number | Publication Date |
|---|---|
| CN1164288A true CN1164288A (en) | 1997-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95196321A Pending CN1164288A (en) | 1994-11-18 | 1995-11-07 | Security thread detector assembly |
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| Country | Link |
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| CN (1) | CN1164288A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361164C (en) * | 1999-05-11 | 2008-01-09 | 迪布尔特有限公司 | Double sheet detector for automated transaction machine |
| CN100504428C (en) * | 2002-03-04 | 2009-06-24 | 西柏控股有限公司 | Measurement probe and authentication device comprising the same and authentication method |
| WO2012059054A1 (en) * | 2010-11-05 | 2012-05-10 | 山东新北洋信息技术股份有限公司 | Paper money safety line detecting method and device |
| CN106447898A (en) * | 2016-08-17 | 2017-02-22 | 深圳怡化电脑股份有限公司 | Safe line positioning method and device |
-
1995
- 1995-11-07 CN CN95196321A patent/CN1164288A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361164C (en) * | 1999-05-11 | 2008-01-09 | 迪布尔特有限公司 | Double sheet detector for automated transaction machine |
| CN100504428C (en) * | 2002-03-04 | 2009-06-24 | 西柏控股有限公司 | Measurement probe and authentication device comprising the same and authentication method |
| WO2012059054A1 (en) * | 2010-11-05 | 2012-05-10 | 山东新北洋信息技术股份有限公司 | Paper money safety line detecting method and device |
| CN106447898A (en) * | 2016-08-17 | 2017-02-22 | 深圳怡化电脑股份有限公司 | Safe line positioning method and device |
| CN106447898B (en) * | 2016-08-17 | 2019-06-11 | 深圳怡化电脑股份有限公司 | A kind of safety line localization method and device |
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