GB2597443A - A magnetic pattern recognition sensor - Google Patents

A magnetic pattern recognition sensor Download PDF

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Publication number
GB2597443A
GB2597443A GB2011230.6A GB202011230A GB2597443A GB 2597443 A GB2597443 A GB 2597443A GB 202011230 A GB202011230 A GB 202011230A GB 2597443 A GB2597443 A GB 2597443A
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GB
United Kingdom
Prior art keywords
magnetic
magnetic field
pattern
sensor
pattern recognition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB2011230.6A
Other versions
GB202011230D0 (en
Inventor
Gibb Ian
Alexandra Cruz Abrunhosa Sofia
Isabel Pinheiro Cardoso De Freitas Susana
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inspectron Ltd
Macon Management and Design Ltd
Inst Of Systems And Computer Engineering For Microsystems And Nanotechnologies
Original Assignee
Inspectron Ltd
Macon Management and Design Ltd
Inst Of Systems And Computer Engineering For Microsystems And Nanotechnologies
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inspectron Ltd, Macon Management and Design Ltd, Inst Of Systems And Computer Engineering For Microsystems And Nanotechnologies filed Critical Inspectron Ltd
Priority to GB2011230.6A priority Critical patent/GB2597443A/en
Publication of GB202011230D0 publication Critical patent/GB202011230D0/en
Priority to PCT/GB2021/051888 priority patent/WO2022018442A1/en
Publication of GB2597443A publication Critical patent/GB2597443A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
    • G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
    • G06K7/087—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors flux-sensitive, e.g. magnetic, detectors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
    • G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06187—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with magnetically detectable marking
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/12—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by magnetic means

Abstract

Magnetic pattern recognition sensor comprising an electromagnet 10 and a magnetic sensor 11. The electromagnet (optionally a solenoid 12 with a metallic core 13) applies a magnetic field 14 to magnetise the pattern to be read 2 and the sensor reads the magnetic field generated by the magnetised pattern. A magnetic field is applied to magnetise the pattern then removed before a sensor reads the field (6 figure 3) generated by the magnetised pattern 5. The sensor may measure an orthogonal component of the field generated by the magnetised pattern, which may be in the same plane as the north- and south-poles of the electromagnet. The senor may be a tunnel magneto resistive (TMR) sensor and may be placed between the electromagnet and the south pole of the electromagnet. The sensor may scan the pattern in sections. The magnetic sensor may be deactivated while the magnetising field is applied. The pattern may be a magnetic barcode.

Description

A Magnetic Pattern Recognition Sensor
Technical Field of the Invention
The present invention relates to a magnetic pattern recognition sensor and a method of magnetic pattern recognition. In particular, but not exclusively, the invention 5 concerns a magnetic barcode reader and a method of reading magnetic barcodes.
Background to the Invention
Magnetic pattern recognition sensors have a number of applications, including the recognition of types of bank notes, the recognition of patterns printed in magnetic ink such as magnetic barcodcs, and reading magnetic cards.
A known magnetic pattern recognition sensor in use is shown in figures 1 and 2. The magnetic pattern recognition sensor comprises a permanent magnet 1 and a Magneto Resistive (MR) sensor 4. The technology used for the MR sensor can be anisotropic magnetoresistance (AMR), giant magnetoresistance (GMR) or tunnel magnetoresistance (TMR). The permanent. magnet 1 is positioned above a section 5 of a pattern 2 which a user wishes to read. The permanent magnet 1 applies a magnetising magnetic field 3 to the section 5, which magnetises it. The MR sensor 4 is positioned between the permanent magnet 1 and the magnetised pattern 2. The MR sensor 4 measures a component of the read magnetic field generated by the magnetised pattern 2. From the measured component., the magnetic pattern recognition sensor can determine the pattern 2. The magnetic pattern recognition sensor is scanned across the entire pattern 2, magnetising sections 5 of the pattern 2 and measuring components of the read magnetic fields generated by the magnetised sections 5 as it goes to determine the entire pattern 2.
The read magnetic field of the magnetised pattern 2 is much weaker than the magnetising magnetic field 3 of the permanent magnet I. To allow the MR sensor 4 to measure the read magnetic field of the magnetised pattern 2 without the signal being swamped out by the magnetising magnetic field 3 of the permanent magnet, the MR sensor 4 is arranged to measure orthogonal components of the pattern's magnetic field wherein the same orthogonal components of the magnetising magnetic field 3 of the permanent magnet 1 in and around the MR sensor are minimal. For example, as shown in figure 1 the magnetising magnetic field 3 has orthogonal components z (up and down in figure 1), x (left and right in figure 1) and y (into and out of the page in figure 1). In aml around the MR sensor 4 the x aml y components of the magnetising magnetic field 3 are minimal. Accordingly, the MR sensor 4 is arranged to measure the read magnetic field generated by the pattern 2 in an x-y plane. This means the MR sensor 4 measure the read magnetic field in a plane orthogonal to the planes in which the permanent magnet 1 generates the magnetising magnetic field 3 -in the case of figure 1, the MR sensor 4 is arranged to measure the read magnetic field in the x-y plane, while the permanent magnet 1 is arranged to generate the magnetising magnetic field 3 in z orientated planes.
Given the MR sensor 4 must always be arranged to measure the read magnetic field in a different, orthogonal plane to the planes in which the permanent magnet 1 is arranged to apply the magnetising magnetic field 3, this limits the number of ways the magnetic pattern recognition sensor can be constructed.
Further to this, as shown in figure 3 the read magnetic field 6 only has a significant x component at the edges of the sections 5 of the pattern 2. This means the magnetic pattern recognition sensor can only determine the positions of the edges of the pattern 2, and must infer the whole pattern 2 from the positions of the edges. The whole pattern 2 can be incorrectly inferred when just relying on edge measurements -for example, when two edges are close together MR sensor may not measure them.
Embodiments of the present invention seek to overcome these or other disadvantages and provide an improved magnetic pattern recognition sensor and method of magnetic pattern recognition sensing.
Summary of the Invention
According to a first. embodiment of the present invention there is provided a magnetic pattern recognition sensor comprising an electromagnet and a magnetic sensor, the electromagnet operable to apply a magnetising magnetic field to a pattern to be read to magnetise it and the magnetic sensor operable to measure a read magnetic field generated by the magnetised pattern.
Using an electromagnet means the magnetising magnetic field applied can be turned on and off. As such, the magnetic pattern recognition sensor can apply the magnetising magnetic field via the electromagnet, turn off the magnetising magnetic field, and then measure the read magnetic field due to the remanence of the pattern and/or the relaxation of the read magnetic field generated by the magnetised pattern.
This means the measurement is not impacted by the application of the magnetising magnetic field, and so can measure in the same plane as the magnetising magnetic field is applied. The magnetic pattern recognition sensor is therefore less restricted in how it can be set up.
Furthermore, the magnetic pattern recognition sensor can measure the position body of a pattern, rather than its edge (or just its edge). As such, it is more likely to correctly determine the pattern, since close together edges of the pattern won't or are less likely to cause an incorrect measurement.
The magnetic sensor may be operable to measure a component of the read magnetic field. The magnetic sensor may be operable to measure an orthogonal component of the read magnetic field. The magnetic sensor may be operable to measure two orthogonal components of the read magnetic field.
The magnetic sensor may be operable to measure the read magnetic field in a plane. The magnetic sensor may be arranged to measure the read magnetic field in the same plane in which a north pole and a south pole of the electromagnet reside.
By measuring the read magnetic field in the same plane as the north and south poles reside, the magnetic sensor can be arranged to measure the body of a pattern and the edges. Accordingly, the determination of the pattern by the magnetic pattern recognition sensor is even more accurate.
The magnetic sensor may be a Tunnel Magneto Resistive sensor. The magnetic sensor may be a Giant Magneto Resistive sensor. The magnetic sensor may be an Anisotropic Magneto Resistive sensor.
The electromagnet may comprise a solenoid. The electromagnet may comprise a magnetic core. The solenoid may be coiled around the magnetic core.
The magnetic sensor may be positioned opposite a pole of the electromagnet.
The magnetic sensor may be positioned opposite a south pole of the electromagnet. The electromagnet and magnetic sensor may be arranged so that, in use, the magnetic sensor is between the electromagnet and the pattern.
The electromagnet may be operable to apply the magnetising magnetic field to a section of the pattern to be read to magnetise it. The magnetic sensor may be operable to measure the read magnetic field generated by the magnetised section of the pattern.
The magnetic pattern recognition sensor may be operable to scan across a plurality of sections of the pattern, applying the magnetising magnetic field to and measuring the read magnetic field generated by each section one at a time.
The electromagnet may be operable to turn off to stop the generation of the magnetising magnetic field. The electromagnet may be operable to turn on to generate the magnetising magnetic field. The magnetic sensor may be operable to turn off to stop measuring the read magnetic field. The magnetic sensor may be operable to turn on to measure the read magnetic field. The magnetic sensor may be operable to turn on when the electromagnet is turned off. The magnetic sensor may be operable to turn on only when the electromagnet is turned off. The electromagnet may be operable to turn on when the magnetic sensor is turned off The electromagnet may be operable to turn on only when the magnetic sensor is turned off The magnetic pattern recognition sensor may comprise a control unit operable to control the electromagnet and/or magnetic sensor. The control unit may be operable to turn the electromagnet on and off. The control unit may be operable to control a supply of current to the electromagnet to turn the electromagnet on and off. The control unit may be operable to turn the magnetic sensor on and off The control unit may be operable to turn the magnetic sensor on when the electromagnet is turned off. The control unit may be operable to turn on the magnetic sensor only when the electromagnet is turned off. The control unit may be operable to turn on the electromagnet when the magnetic sensor is turned off. The control unit may be operable to turn on the electromagnet only when the magnetic sensor is turned off The magnetic sensor only turning on only when the electromagnet is off, and/or vice versa, means the magnetic pattern recognition sensor is less likely to make a false measurement.
The electromagnet may be operable to generate a second magnetising magnetic field and apply it to the pattern to magnetise it, the second magnetising magnetic field having a polarity which is the reverse of the first magnetising magnetic field. The control unit may be operable to run a reverse direction current through the electromagnet to generate the second magnetising magnetic field. The electromagnet may be operable to alternate between generating die first magnetising magnetic field and thc second magnetising magnetic field. The control unit may be operable to alternate between directing the electromagnet to generate the first magnetising magnetic field and the second magnetising magnetic field, directing the magnetic sensor to measure the read magnetic field after each field is applied.
The magnetic pattern recognition sensor may be a magnetic bar code reader.
The magnetic pattern recognition sensor may comprise a processing unit operable to process the measurement or measurements made by the magnetic sensor and so determine the shape of the pattern.
According to a second aspect of the present invention there is provided a method of magnetic pattern recognition sensing, comprising the steps of: a. generating a magnetising magnetic field and applying the magnetising
magnetic field to a pattern to magnetise it;
b. stopping the generation of the magnetising magnetic field; and c. once generation of the magnetising magnetic field has been stopped, measuring a read magnetic field generated by the magnetised pattern.
By measuring the read magnetic field generated by the pattern once generation of the magnetising magnetic field has been stopped, measurement is not impacted by the application of the magnetising magnetic field and so can measure in the same plane as the magnetising magnetic field is applied. A magnetic pattern recognition sensor used for the method is therefore less restricted in how it can be set up.
Furthermore, the position of the body of a pattern can be measured, rather than its edge (or just its edge). As such, the method is more likely to correctly determine the pattern, since close together edges of the pattern won't or are less likely to cause an incorrect measurement.
The magnetising magnetic field may be applied to a section of a pattern to magnetise it and the read magnetic field generated by the magnetised section of the pattern.
The method may comprise the additional steps of: d. generating a second magnetising magnetic field, the polarity of the second magnetising magnetic field being the reverse of the polarity of the first magnetising magnetic field, and applying the second magnetising magnetic field to the pattern to magnetise it; e. stopping the generation of the second magnetising magnetic field; and f. once generation of the second magnetising magnetic field has been stopped, measuring the read magnetic field generated by the magnetised pattern.
The additional steps result in two measurements which can be combined to form an alternating current measurement, which means subsequent processing is easier since amplification can be AC coupled instead of DC coupled.
Steps a to c or a to f may be repeated one or more times. For each repetition of steps a to c the magnetising magnetic field may be applied to a respective section of the pattern and the read magnetic field of the respective section of the pattern may be measured. For each repetition of steps a to f the first magnetising magnetic field and second magnetising magnetic field may be applied to a respective section of the pattern and the read magnetic field of the respective section of the pattern may be measured
after each magnetising magnetic field is applied.
The read magnetic field generated by the magnetised pattern may be measured in a plane in which a north pole and south pole of the magnetising magnetic field reside.
By measuring the read magnetic field in the same plane as the or each magnetising magnetic field is generated, the method can measure both the body and edges of a pattern. Accordingly, the determination of the pattern is even more accurate.
An electromagnet may be used to generate the or each magnetising magnetic field. A current may be run through the electromagnet to generate the or each magnetising magnetic field. The current may be reduced to zero to stop the generation of the or each magnetising magnetic field.
The read magnetic field generated by the magnetised pattern may be measured in a plane. A north pole and a south pole of the or each magnetising magnetic field may reside in the plane The pattern may be a bar code comprising a plurality of bars. The plane may be perpendicular faces and long sides of the bars.
The method may use the magnetic pattern recognition sensor of the first aspect. The magnetic pattern recognition sensor used may have any combination of or all the optional features of the first aspect, as desired and/or required.
Detailed Description of the Invention
In order that the invention may be more clearly understood one or more embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings, of which: Figure 1 shows a prior art magnetic pattern recognition sensor; Figure 2 shows a top view of a magnetic bar code; Figure 3 shows a side view of a bar of the magnetic bar code of figure 2; Figure 4 shows a magnetic pattern recognition sensor; Figure 5 shows the top view of the magnetic bar code of figure 2, aligned with measurement signals from magnetic pattern recognition sensors; and Figure 6 shows a magnetic pattern recognition sensor.
As shown in figure 4, the magnetic pattern recognition sensor comprises an electromagnet 10 and a MR sensor 11. The electromagnet 10 is formed of a solenoid 12 coiled around a core 13. The MR sensor 11 is positioned opposite the south pole of the electromagnet 10, and is positioned such that in use it lies between the electromagnet 10 and the pattern 2 to be measured.
In use, the magnetic pattern recognition sensor is placed over a section 5 of the pattern 2. In the case of a magnetic barcode, it is placed over a bar. The electromagnet is turned on, generating a magnetising magnetic field 14. The magnetising magnetic field 14 extends through the MR sensor 11 to the section 5, magnetising the section 5.
Once the section 5 has been magnetised, the electromagnet 10 is turned off and generation of the magnetising magnetic field 14 stops. To turn the electromagnet 10 off, the current flow through it is stopped. Once the current through the electromagnet is zero, the MR sensor 11 is turned on to measure magnetic fields. The MR sensor II measures the read magnetic field 6 generated by the magnetised section 5, measuring the remanence of the read magnetic field 6 or the relaxation of the magnetised section 5.
IS Because the magnetising magnetic field 14 of the electromagnet 10 is no longer being generated, the measurement of the read magnetic field 6 of the magnetised section 5 should not be impacted by it. Accordingly, the MR sensor 11 is not limited to measuring the read magnetic field 6 of the section 5 in the x-y plane, and instead can be arranged to measure the read magnetic field 6 in any plane. When arranged to measure the read magnetic field 6 in a z-oriented plane the MR sensor 11 can measure the body of the section 5. In particular, when the MR sensor 11 is arranged to measure the read magnetic field 6 in a plane perpendicular the faces and long sides of the section 5 (the x-z plane), the MR sensor 11 can measure both the body of each section 5 and the edges between adjacent sections 5.
Figure 5 shows signals measured by a MR sensor 11 in different arrangements.
The first signal 15 is the signal measured by a MR sensor 11 arranged to measure the read magnetic field 6 in an x-y plane, with positive spikes 16 in the first signal 15 corresponding to each first long side of each bar 5 and equal amplitude, negative spikes 17 in the signal corresponding to each second long side of each bar 5. The first and second long sides of each bar 5 resulting in spikes 16, 17 in different directions is due to the field lines being in opposite directions above the long sides, as shown in figure 3. The second signal 18 is the signal measured by a MR sensor 11 arranged to measure the read magnetic field 6 in an z-y plane, with positive spikes 19 corresponding to the position of each body of each bar 5.
The magnetic pattern recognition sensor can scan across a pattern 2, magnetising each section 5 of the pattern 2 and measuring any read magnetic field 6 generated by each section 5 in turn. The signals 15, 18 measured across the scan are passed to a processing unit of the magnetic pattern recognition sensor to which is operable to process the signals 15, 18 and determine the shape of the pattern 2 from how the positions of the spikes 16, 17, 18 correspond to the position of the magnetic pattern recognition sensor in its scan across the pattern 2.
hi some embodiments, shown in figure 6, the magnetic pattern recognition sensor 100 can also comprise a control unit 20. The control unit 20 is connected to the electromagnet 10 and controls the electrical current supplied to the electromagnet 10, being operable to turn the current on and off and so turn the electromagnet 10 on and off. Furthermore. the control unit 20 is also connected to the MR sensor 11 and operable to turn it on and off In use, the control unit 20 turns the electromagnet 10 on to generate the magnetising magnetic field 14 and so magnetise the section 5 of pattern 2. Once this is done the control unit 20 turns the electromagnet 10 off and, only once the current through the electromagnet is zero, turns the MR sensor 11 on to measure the read
magnetic field 6 of the magnetised section.
In some embodiments the electromagnet 10 can alternate between generating a first magnetising magnetic field 14 as described above and a second magnetising magnetic field, the second magnetising magnetic field having a polarity which is the reverse of the first magnetising magnetic field 14. Once the section 5 has been magnetised with the first magnetising magnetic field 14 and the read magnetic field 6 measured, the current through the electromagnet 10 is reversed to generate the second magnetising magnetic field. The second magnetising magnetic field is applied to the section 5 to magnetise it. The current is then reduced to zero to turn the electromagnet 10 off and stop generation of the second magnetising magnetic field. The MR sensor II is then used to measure the read magnetic field of the magnetised section 5. This results in two measurements of the read magnetic field, which can be combined to form an AC measurement. The AC measurement is easier to process by the processing unit, since any amplification necessary can be AC coupled rather than DC coupled.
The one or more embodiments are described above by way of example only. Many variations are possible without departing from the scope of protection afforded by the appended claims.

Claims (25)

  1. CLAIMS1. A magnetic pattern recognition sensor comprising an electromagnet and a magnetic sensor, the electromagnet operable to apply a magnetising magnetic field to a pattern to be read to magnetise it and the magnetic sensor operable to measure a read magnetic field generated by the magnetised pattern.
  2. 2. A magnetic pattern recognition sensor according to claim 1, wherein the magnetic sensor is operable to measure a component of the read magnetic field generated by the magnetised pattern.
  3. 3. A magnetic pattern recognition sensor according to claim 2, wherein the magnetic sensor is operable to measure an orthogonal component of the read magnetic field generated by the magnetised pattern.
  4. 4. A magnetic pattern recognition sensor according to any preceding claim wherein magnetic sensor is operable to measure the read magnetic field in a plane which is the same plane in which a north pole and a south pole of the electromagnet reside.
  5. 5. A magnetic pattern recognition sensor according to any preceding claim, wherein the magnetic sensor is a Tunnel Magneto Resistive sensor.
  6. 6. A magnetic pattern recognition sensor according to any preceding claim wherein the electromagnet comprises a solenoid.
  7. 7. A magnetic pattern recognition sensor according to claim 6 wherein the electromagnet comprises a magnetic core around which the solenoid is coiled.
  8. S. A magnetic pattern recognition sensor according to any preceding claim wherein the magnetic sensor is positioned opposite a pole of the electromagnet
  9. 9. A magnetic pattern recognition sensor according to claim 8 wherein the magnetic sensor is positioned opposite the south pole of the electromagnet.
  10. 10. A magnetic pattern recognition sensor according to any preceding claim wherein the electromagnet and magnetic sensor are arranged so that, in use, the magnetic sensor is between the electromagnet and the pattern.
  11. 11. A magnetic pattern recognition sensor according to any preceding claim, wherein the electromagnet operable to apply a magnetic field to a section of the pattern to be read to magnetise it and the magnetic sensor operable to measure a magnetic field generated by the magnetised section of the pattern.
  12. 12. A magnetic pattern recognition sensor according to claim 11 which is operable to scan across a plurality of sections of a pattern, applying the generated magnetic field to and measuring the read magnetic field generated by each section one at a time.
  13. 13. A magnetic pattern recognition sensor according to any preceding claim comprising a control unit operable to turn the magnetic sensor on and off to measure and stop measuring magnetic fields and to turn the magnetic sensor on and off to measure and stop measuring magnetic fields.
  14. 14. A magnetic pattern recognition sensor according to claim 13 wherein the control unit is operable to turn the magnetic sensor on when the electromagnet is turned off.
  15. 15. A magnetic pattern recognition sensor according to claim 14, wherein the control unit is operable to only turn on the magnetic sensor when the electromagnet is turned off.
  16. 16. A magnetic pattern recognition sensor according to any preceding claim which is a magnetic bar code reader.
  17. 17. A method of magnetic pattern recognition sensing, comprising the steps of: a. generating a magnetising magnetic field and applying the magnetising magnetic field to a pattern to magnetise it; b. stopping the generation of the magnetic field; and c. once generation of the magnetising magnetic field has been stopped, measuring a read magnetic field generated by the magnetised pattern.
  18. 18. A method of magnetic pattern recognition sensing according to claim 17, comprising the additional steps of: d. generating a second magnetising magnetic field, the polarity of the second magnetising magnetic field being the reverse of the polarity of the first magnetising magnetic field, and applying the second magnetising magnetic field to the pattern to magnetise it; e. stopping the generation of the second magnetising magnetic field; and f. once generation of the second magnetising magnetic field has been stopped, measuring the read magnetic field generated by the magnetised pattern.
  19. 19. A method of magnetic pattern recognition sensing according to either of claims 17 or 18 wherein the or each magnetising magnetic field is applied to a section of a pattern to magnetise it and the read magnetic field generated by the magnetised section of the pattern is measured.
  20. 20. A method of magnetic pattern recognition sensing according to claim 19, wherein steps a to c are repeated one or more times.
  21. 21. A method of magnetic pattern recognition sensing according to claim 20 wherein for each repetition of steps a to c the magnetising magnetic field is applied to a respective section of the pattern and the read magnetic field of the respective section of the pattern is measured.
  22. 22. A method of magnetic pattern recognition sensing according to either of claims 20 or 21, when dependent upon claim 18, wherein steps a to f are repeated one or more times.
  23. 23. A method of magnetic pattern recognition sensing according to claim 22 wherein for each repetition of steps a to f the firs( magnetising magnetic field and second magnetising magnetic field are applied to a respective section of the pattern and the read magnetic field of the respective section of the pattern may be measured after each magnetising magnetic field is applied.
  24. 24. A method of magnetic pattern recognition sensing according to any of claims 17 to 23 wherein the read magnetic field generated by the magnetised pattern is measured in a plane in which a north pole and south pole of the magnetisingmagnetic field reside.
  25. 25. A method of magnetic pattern recognition sensing according to any of claims 17 to 24 wherein an electromagnet is used to generate the magnetic field, a current being run through the electromagnet to generate the magnetic field.
GB2011230.6A 2020-07-21 2020-07-21 A magnetic pattern recognition sensor Withdrawn GB2597443A (en)

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GB2011230.6A GB2597443A (en) 2020-07-21 2020-07-21 A magnetic pattern recognition sensor
PCT/GB2021/051888 WO2022018442A1 (en) 2020-07-21 2021-07-21 A magnetic pattern recognition sensor

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US4748673A (en) * 1984-06-08 1988-05-31 Electronique Serge Dassault Reader for reading magneto-optical characters, with the options of printing them or storing them
JP2000259772A (en) * 1999-03-10 2000-09-22 Seiko Epson Corp Magnetic reader and composite processor using this reader
US20010001471A1 (en) * 1994-10-18 2001-05-24 Tsutomu Momose Appartus and method for printing on media and detecting information magnetically recorded on the media
JP2011028531A (en) * 2009-07-27 2011-02-10 Canon Electronics Inc Magnetic ink character reading apparatus
US20150370210A1 (en) * 2012-06-25 2015-12-24 Shandong New Beiyang Information Technology Co., Ltd. Multifunctional magnetic reading device and control method thereof as well as printer
EP3153994A1 (en) * 2014-05-30 2017-04-12 Multidimension Technology Co., Ltd. Magnetic anti-counterfeit mark and identification system thereof
US20190180130A1 (en) * 2017-12-08 2019-06-13 Toshiba Tec Kabushiki Kaisha Magnetic ink character recognition apparatus and method by the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4748673A (en) * 1984-06-08 1988-05-31 Electronique Serge Dassault Reader for reading magneto-optical characters, with the options of printing them or storing them
US20010001471A1 (en) * 1994-10-18 2001-05-24 Tsutomu Momose Appartus and method for printing on media and detecting information magnetically recorded on the media
JP2000259772A (en) * 1999-03-10 2000-09-22 Seiko Epson Corp Magnetic reader and composite processor using this reader
JP2011028531A (en) * 2009-07-27 2011-02-10 Canon Electronics Inc Magnetic ink character reading apparatus
US20150370210A1 (en) * 2012-06-25 2015-12-24 Shandong New Beiyang Information Technology Co., Ltd. Multifunctional magnetic reading device and control method thereof as well as printer
EP3153994A1 (en) * 2014-05-30 2017-04-12 Multidimension Technology Co., Ltd. Magnetic anti-counterfeit mark and identification system thereof
US20190180130A1 (en) * 2017-12-08 2019-06-13 Toshiba Tec Kabushiki Kaisha Magnetic ink character recognition apparatus and method by the same

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