CN104063938A - Magnetic Pattern Detection Device - Google Patents

Magnetic Pattern Detection Device Download PDF

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Publication number
CN104063938A
CN104063938A CN201410310405.5A CN201410310405A CN104063938A CN 104063938 A CN104063938 A CN 104063938A CN 201410310405 A CN201410310405 A CN 201410310405A CN 104063938 A CN104063938 A CN 104063938A
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CN
China
Prior art keywords
magnetic
sensor element
medium
magnetic sensor
signal
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Granted
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CN201410310405.5A
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Chinese (zh)
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CN104063938B (en
Inventor
百濑正吾
野口直之
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Nidec Sankyo Corp
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Nidec Sankyo Corp
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Priority claimed from JP2010024789A external-priority patent/JP5534843B2/en
Priority claimed from JP2010024787A external-priority patent/JP5534842B2/en
Application filed by Nidec Sankyo Corp filed Critical Nidec Sankyo Corp
Publication of CN104063938A publication Critical patent/CN104063938A/en
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Publication of CN104063938B publication Critical patent/CN104063938B/en
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon

Abstract

Provided is a magnetic pattern detection device capable of increasing a gain without a large increase in cost. Specifically, in an amplification unit (70) of a signal processing unit (60) of the magnetic pattern detection device (100), when a sensor output signal and a reference voltage are input to an amplifier (71), the sensor output signal being output from a magnetic sensor element (40) which is excited by an excitation signal; a reference voltage generation unit (72) generates a signal varying in tandem with the excitation signal, and inputs the generated signal to an amplifier (71) as a reference voltage. The reference voltage generation unit (72) is provided with a CR differentiation circuit (73) which generates a reference voltage by differentiating the excitation signal, and, because the generated reference voltage is slightly different from the sensor output signal output from the magnetic sensor element, the amplifier gain can be increased.

Description

Magnetic pattern detecting apparatus
The application is that denomination of invention is that " magnetic pattern detecting apparatus ", international filing date are dividing an application of January 13, application number in 2011 application for a patent for invention that is 201180001718.7 (international application no is PCT/JP2011/050449).
Technical field
The present invention relates to a kind of to the object of magnetic being installed, the magnetic pattern detecting apparatus that the magnetic pattern of the media such as bank note that print with magnetic ink detects.
Background technology
From the objects such as card of magnetic are installed, the media such as bank note that print with magnetic ink detect the magnetic pattern detecting apparatus of magnetic pattern, the flux change producing while utilizing magnetic sensor element to detect medium by this magnetic pattern detecting apparatus, and utilize signal processing part to carry out signal processing to the sensor output signal of magnetic sensor element output.Here, in signal processing part, with amplifier, form enlarging section, to this amplifier input pickup output signal and the reference voltage that formed by fixed voltage, utilizing after enlarging section carried out sensor output signal amplifying, carry out various signal processing (with reference to patent documentation 1～3).
And, in this magnetic pattern detecting apparatus, the flux change producing while utilizing magnetic sensor element to detect medium by this magnetic pattern detecting apparatus, and detect magnetic pattern according to the signal of magnetic sensor element output.Here, magnetic sensor element is as shown in Figure 18 (a), 18 (b), on the column direction Y (medium Width) of moving direction X (line direction) quadrature with medium 1, for example be arranged with 20 magnetic sensor element and be respectively used to channel C H1～CH20, by these 20 magnetic sensor element 40 being scanned on column direction Y, to detect the magnetic pattern of medium 1 on whole Width.
; if a plurality of magnetic sensor element 40 shown in Figure 18 (a), 18 (b) are carried out to single pass; 20 magnetic sensor element 40 due to channel C H1～CH20 can detect data; therefore; as shown in Figure 18 (d); if synchronously the detection data-switching of magnetic sensor element 40 is become to digital signal with A/D converter with the moment of magnetic sensor element 40 in conducting state, can detect a row magnetic pattern of medium 1.Here, the excitation signal that magnetic sensor element 40 is 500kHz by frequency carries out excitation.
And medium 1 is to move along line direction X.Therefore, if represent magnetic sensor element 40 residing region under conducting state by hatched example areas, as shown in Figure 18 (c), in medium 1, this magnetic sensor element 40 residing region (having marked the region to top-right oblique line) magnetic sensor element 40 residing region (having marked the region to bottom-right oblique line) under conducting state when next time scanning under conducting state adjacent in a side contrary with moving direction X in when scanning.Thereby, can detect the magnetic pattern on whole medium 1.
Patent documentation 1: Japanese Patent Laid-Open 2007-241653 communique
Patent documentation 2: Japanese Patent Laid-Open 2007-241654 communique
Patent documentation 3: Japanese Patent Laid-Open 2009-163336 communique
Summary of the invention
Yet in the structure that patent documentation 1～3 is recorded, when sensor output signal is amplified, owing to having used the reference voltage of fixed voltage as amplifier, so the difference of sensor output signal and reference voltage is larger.For these reasons, in order to make the signal of amplifier output be unlikely to saturated, need to the gain of amplifier be suppressed lowlyer, therefore exist and cannot improve the problem that detects gain.On the other hand, if the output signal of magnetic sensor element is carried out to differential amplification with bridge circuit, existence can cause the problem that cost significantly rises.
And, in the magnetic pattern detecting apparatus of this mode that a plurality of magnetic sensor element 40 of arranging along column direction Y is scanned and made medium 1 move, can be because of the translational speed of medium 1, the size of magnetic sensor element 40 on the moving direction X of medium 1, sweep velocity, and cause this in when scanning magnetic sensor element 40 under conducting state residing region (having marked the region to top-right oblique line) and while scanning next time magnetic sensor element 40 under conducting state, between residing region (having marked the region to bottom-right oblique line), produce clearance G, as shown in Figure 18 (c).For example, when the translational speed of medium 1 is 0.0016mm/ μ s, the sweep time of the magnetic sensor element on column direction Y is while being 200 μ s, after single pass completes, medium 1 moves 0.32mm, but, if in this case, magnetic sensor element 1 is of a size of 0.3mm on moving direction, this in when scanning magnetic sensor element 40 under conducting state residing region with on magnetic sensor element 40 can generation 0.02mm between residing region under conducting state while once scanning clearance G.Therefore,, for being equivalent to the region of clearance G in medium 1, just can not detecting its magnetic characteristic by magnetic sensor element 40, thereby be difficult to from all surfaces of medium 1, detect magnetic pattern accurately.
On the other hand, the sensor sensing range having due to magnetic sensor element 40 is the grade on medium 1 times more than projected area in magnetic sensor element 40 conventionally, therefore, if can coverage gap G by the sensor sensing range, just can detect magnetic pattern from all surfaces of medium 1, but, even in this case, also can be because of the translational speed of medium 1, the size of the sensor sensing range of magnetic sensor element 40 on the moving direction X of medium 1, sweep velocity, and be difficult to avoid sensor sensing range when this scans and on produce clearance G between sensor sensing range while once scanning.
In view of the above problems, first technical matters that the present invention will solve is to provide and a kind ofly can raise the cost significantly and can improve the magnetic pattern detecting apparatus of gain.
Even second technical matters that the present invention will solve is to provide a kind of mode that adopts a plurality of magnetic sensor element to arranging along column direction to scan and make medium to move with respect to magnetic sensor, also can from all surfaces of medium, detect reliably the magnetic pattern detecting apparatus of magnetic pattern.
In order to solve above-mentioned first technical matters, magnetic pattern detecting apparatus of the present invention comprises for detecting the magnetic sensor element of the magnetic characteristic of medium, detect the signal processing part of the magnetic pattern of described medium with the testing result based on this magnetic sensor element, it is characterized in that, described signal processing part has enlarging section, amplify the sensor output signal that has been carried out the described magnetic sensor element of excitation by excitation signal and export this enlarging section, described enlarging section comprises amplifier and reference voltage generating unit, wherein, to described amplifier, input described sensor output signal and reference voltage, the signal that described reference voltage generating unit generates and described excitation signal changes is in linkage as described reference voltage.
In the present invention, when sensor output signal being amplified with amplifier, owing to using the reference voltage changing in linkage with excitation signal, therefore less from the sensor output signal of magnetic sensor element output and the difference of reference voltage.Thereby, even if do not append the circuit that bridge circuit etc. can cause cost to increase, the gain that also can improve amplifier, and can improve S/N ratio.And, because reference voltage is to change in linkage with excitation signal, and synchronize with sensor output signal, therefore can suitably to sensor output signal, amplify.
In the present invention, described reference voltage preferably has the signal that described excitation signal has been carried out to the waveform that obtains after differential.The time diffusion of the magnetic flux that is equivalent to excitation signal to produce due to sensor output signal, therefore if use, excitation signal has been carried out to the signal of the waveform that obtains after differential as the reference voltage of amplifier, because the difference of sensor output signal and reference voltage is less, thereby can improve gain.
In the present invention, thereby described reference voltage generating unit preferably has, described excitation signal is carried out to the CR differentiating circuit that differential generates described reference voltage.By adopting this structure, use electronic component inexpensive such as electric capacity, resistance, thereby with regard to forming, excitation signal is carried out to the differentiating circuit that differential generates reference voltage.
In the present invention, described reference voltage generating unit also can have illusory magnetic sensor element, and this illusory magnetic sensor element is carried out excitation by described excitation signal, and the signal that output is carried out obtaining after differential to this excitation signal is as described reference voltage.The time diffusion of the magnetic flux that the output signal of illusory magnetic sensor element is equivalent to excitation signal to produce, thus can generate excitation signal has been carried out to the waveform that obtains after differential signal as reference voltage.If adopt said reference voltage, because the difference of this reference voltage and sensor output signal is minimum, therefore can improve gain.
In the present invention, described signal processing part preferably includes first integral circuit and second integral circuit, wherein, described first integral circuit is that positive component of signal is carried out integration to the signal Semi-polarity of described amplifier output, and described second integral circuit is that negative component of signal is carried out integration to the signal Semi-polarity of described amplifier output.If adopt this structure, even if the pulsewidth of the signal of exporting from amplifier is very narrow, but owing to can be also that positive component of signal and polarity is that negative component of signal is carried out respectively integration to polarity, thereby amplitude variations is converted to area change, therefore by simple structure, just can improves apparent gain.
The magnetic pattern detecting apparatus of another embodiment of the present invention comprises for detecting the magnetic sensor element of magnetic characteristic of medium and the signal processing part that the testing result based on this magnetic sensor element detects the magnetic pattern of described medium, it is characterized in that, described signal processing part comprises first integral circuit and second integral circuit, wherein, described first integral circuit is that positive component of signal is carried out integration to described sensor output Semi-polarity, and described second integral circuit is that negative component of signal is carried out integration to described sensor output Semi-polarity.
In the present invention, even if the pulsewidth of sensor output signal is very narrow, but owing to can be also that positive component of signal and polarity is that negative component of signal is carried out respectively integration to polarity, thereby amplitude variations be converted to area change, therefore by simple structure, just can improves apparent gain.
In the present invention, described magnetic sensor element preferably has a plurality of coils for exporting described sensor output signal as differential output.If adopt this structure, be not subject to the impact of external disturbance.
And in order to solve above-mentioned second technical matters, magnetic pattern detecting apparatus of the present invention comprises the magnetic sensor element that detects magnetic characteristic from medium, with the connecting gear that described medium is moved with respect to this magnetic sensor element, it is characterized in that, described magnetic sensor element is arranged a plurality of on the column direction of the moving direction quadrature with described medium, the translational speed of the described medium transmitting by described connecting gear is made as to v (mm/ μ s), the size of described magnetic sensor element on described moving direction is made as T (mm), the scanning times that time per unit ta (μ s) scans described magnetic sensor element on described column direction is made as N time, described movement speed v, described unit interval ta, described size T and described scanning times N meet following relational expression:
(v×ta)≤(T×N)
In formula, N is more than 2 integer.
In the present invention, because being set to, size T on moving direction of the movement speed v of medium, magnetic sensor element, scanning times N that time per unit ta scans magnetic sensor element on column direction meet above-mentioned relation formula, therefore, this in when scanning magnetic sensor element under conducting state residing region and on while once scanning magnetic sensor element under conducting state, between residing region, can not produce gap.Thereby, even the mode that adopts a plurality of magnetic sensor element to arranging along column direction to scan and make medium to move with respect to magnetic sensor also can detect magnetic pattern from all surfaces of medium reliably.
In the present invention, can adopt following structure: described unit interval ta is for detecting a scan period of a row magnetic pattern of described medium, based on described magnetic sensor element, by the resulting data of scanning of carrying out, detect a row magnetic pattern of described medium in a described scan period.That is, in detecting scan period of a row magnetic pattern, carrying out Multiple-Scan.Therefore, can adopt the structure based on the resulting Data Detection one row magnetic pattern of Multiple-Scan, if adopt this structure, even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element, also can relax the impact that above-mentioned noise produces.
In the present invention, can adopt following structure: based on described magnetic sensor element, by single pass or the resulting data of Multiple-Scan in N the scanning of carrying out, detect a row magnetic pattern of described medium in a described scan period.If adopt this structure, can realize best action according to the kind of medium and the desired accuracy of detection of magnetic pattern detecting apparatus etc.
In the present invention, resulting data of Multiple-Scan in the scanning of N time by carrying out in a described scan period based on described magnetic sensor element preferably, detect a row magnetic pattern of described medium.If adopt this structure, can detect accurately the magnetic characteristic of medium.And, even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element, also can relax the impact of above-mentioned noise.
In the present invention, can adopt following structure: based on described magnetic sensor element, by N the resulting all data of scanning of carrying out, detect a row magnetic pattern of described medium in a described scan period.If adopt this structure,, due to this scanning with next time while scanning, the Deng Bei view field of magnetic sensor element on medium overlaps, and therefore can detect accurately the magnetic characteristic of medium.And, even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element, also can relax the impact of above-mentioned noise.
In the present invention, also can by the part in N the scanning of carrying out, scan resulting data in a scan period based on magnetic sensor element, detect a row magnetic pattern of medium.
For example, also can adopt following structure: in N the scanning based on described magnetic sensor element by carrying out in a described scan period, meet following condition more than twice and be less than the resulting a plurality of data of scanning of N time, detect a row magnetic pattern of described medium, this condition is: when this scans and scans next time, the Deng Bei view field of described magnetic sensor element on described medium overlaps on described moving direction; Or when this scans and scans next time, the Deng Bei view field of described magnetic sensor element on described medium do not overlap but is continuous on described moving direction.
In this case, preferably based on described magnetic sensor element, in the scanning of N time by carrying out in a described scan period, meet following condition more than twice and be less than the resulting a plurality of data of scanning of N time, detect a row magnetic pattern of described medium, this condition is: when this scans and scans next time, the Deng Bei view field of described magnetic sensor element on described medium overlaps on described moving direction.If adopt this structure,, due to this scanning with next time while scanning, the Deng Bei view field of magnetic sensor element on medium overlaps, and therefore can detect accurately the magnetic characteristic of medium.And, even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element, also can relax the impact of above-mentioned noise.
In addition, when the sensor sensing range of described magnetic sensor element on described moving direction is greater than the size T of described magnetic sensor element on described moving direction, also can adopt following structure: in N the scanning based on described magnetic sensor element by carrying out in a described scan period, meet following condition more than twice and be less than the resulting a plurality of data of scanning of N time, detect a row magnetic pattern of described medium, this condition is: when this scans and scans next time, described sensor sensing range overlaps on described moving direction, or when this scans and scans next time, described sensor sensing range does not overlap but is continuous on described moving direction.
In this case, preferably based on described magnetic sensor element, in the scanning of N time by carrying out in a described scan period, meet following condition more than twice and be less than the resulting a plurality of data of scanning of N time, detect a row magnetic pattern of described medium, this condition is: when this scans and scans next time, described sensor sensing range overlaps on described moving direction.If adopt this structure,, due to this scanning with next time while scanning, sensor sensing range overlaps, and therefore can detect accurately the magnetic characteristic of medium.And, even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element, also can relax the impact of above-mentioned noise.
In the present invention, preferably, when resulting a plurality of data detect a row magnetic pattern of described medium in a described scan period based on described magnetic sensor element, described a plurality of data are averaged to processing.If adopt this structure, even in the situation that go out a row magnetic pattern of medium according to a plurality of Data Detection, as long as also carry out simple processing.And, if a plurality of data are averaged to processing, even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element, also can relax the impact of above-mentioned noise.
In the present invention, it is preferably variable that during which single pass in N the scanning based on described magnetic sensor element by carrying out in a described scan period, resulting data detect a row magnetic pattern of described medium.If adopt this structure, can realize best action according to the kind of medium and the desired accuracy of detection of magnetic pattern detecting apparatus etc.
In the present invention, when described magnetic sensor element is carried out excitation output signal by excitation signal, the frequency that described excitation signal has preferably makes signal that described in single pass, a plurality of magnetic sensor element are exported separately comprise the component of signal that the described excitation signal by a plurality of cycles forms.If adopt this structure,, because signal that in single pass, a plurality of magnetic sensor element are exported separately all comprises respectively the component of signal that the excitation signal by a plurality of cycles forms, therefore can detect accurately the magnetic characteristic of medium.
In the magnetic pattern detecting apparatus of first invention, when sensor output signal being amplified with amplifier, owing to using the reference voltage changing in linkage with excitation signal, therefore less from the signal of magnetic sensor output and the difference of reference voltage.Thereby, even if do not append the circuit that bridge circuit etc. can cause cost to increase, the gain that also can improve amplifier, and can improve S/N ratio.And, because reference voltage is to change in linkage with excitation signal, so sensor output signal is synchronizeed with reference voltage, therefore can suitably to sensor output signal, amplify.
In addition, in the magnetic pattern detecting apparatus of another embodiment of first invention, because signal processing part comprises first integral circuit and second integral circuit, wherein, first integral circuit is that positive component of signal is carried out integration to sensor output Semi-polarity, second integral circuit is that negative component of signal is carried out integration to sensor output Semi-polarity, therefore, even in the situation that the pulsewidth of sensor output signal is narrower, also can be that positive component of signal and polarity is that negative component of signal is carried out respectively integration to polarity, thereby amplitude variations is converted to area change.Thereby, by simple structure, just can improve apparent gain.
And in the magnetic pattern detecting apparatus of second invention, because being set to, size on moving direction of the movement speed v of medium, magnetic sensor element, scanning times N that time per unit ta scans magnetic sensor element on column direction meet following relational expression:
(v×ta)≤(T×N)
In formula, N is more than 2 integer,
Therefore, this in when scanning magnetic sensor element under conducting state residing region and on while once scanning magnetic sensor element under conducting state, between residing region, can not produce gap.Thereby, even the mode that adopts a plurality of magnetic sensor element to arranging along column direction to scan and make medium to move with respect to magnetic sensor also can detect magnetic pattern from all surfaces of medium reliably.
Accompanying drawing explanation
Fig. 1 means the key diagram of structure of the magnetic pattern detecting apparatus with magnetic sensor device of first embodiment of the invention 1.
Fig. 2 is the key diagram of the magnetic sensor device of first embodiment of the invention 1.
Fig. 3 is the key diagram of the magnetic sensor element used in the magnetic sensor device of first embodiment of the invention 1.
Fig. 4 means the block scheme of electric structure of the magnetic pattern detecting apparatus of first embodiment of the invention 1.
Fig. 5 is the key diagram that is input to the signal etc. of amplifier in the enlarging section of magnetic pattern detecting apparatus of first embodiment of the invention 1.
Fig. 6 means the key diagram to characteristic of the various magnetic inks that form on medium etc. in the magnetic pattern detecting apparatus of first embodiment of the invention 1.
Fig. 7 means in the magnetic pattern detecting apparatus of first embodiment of the invention 1 key diagram that detects the principle that whether has magnetic pattern from be formed with the medium of different types of magnetic pattern.
Fig. 8 means the key diagram of the enlarging section peripheral structure in the circuit part of magnetic pattern detecting apparatus of first embodiment of the invention 2.
Fig. 9 means the key diagram of enlarging section structure of the magnetic pattern detecting apparatus of first embodiment of the invention 3.
Figure 10 means the key diagram of enlarging section peripheral structure of the magnetic pattern detecting apparatus of first embodiment of the invention 4.
Figure 11 means the key diagram of skew adjustment part peripheral structure of the magnetic pattern detecting apparatus of first embodiment of the invention 5.
Figure 12 is the key diagram of the magnetic sensor element used in the magnetic pattern detecting apparatus of first embodiment of the invention 6.
Figure 13 means the key diagram of electric structure of the magnetic pattern detecting apparatus of second embodiment of the invention 1.
Figure 14 means the key diagram of scanning motion etc. of the magnetic pattern detecting apparatus of second embodiment of the invention 1.
Figure 15 means the key diagram of operation condition of circuit part of the magnetic pattern detecting apparatus of second embodiment of the invention 1.
Figure 16 means the key diagram of magnetic sensor element position at place when each scanning of the magnetic pattern detecting apparatus of second embodiment of the invention 2.
Figure 17 means the magnetic sensor element position at place and key diagram of sensor sensing range thereof when each scanning of the magnetic pattern detecting apparatus of second embodiment of the invention 3.
Figure 18 is the key diagram of magnetic pattern detecting apparatus in the past.
Label declaration
1 medium
11 medium mobile routes
20 magnetic sensor devices
40 magnetic sensor element
48 field coils
49 magnetic test coils
60 signal processing parts
70 enlarging sections
71 amplifiers
72 reference voltage generating units
73 CR differentiating circuit
74 illusory magnetic sensor element
83 skew adjustment parts
100 magnetic pattern detecting apparatus
835 first integral circuit
836 second integral circuit
Embodiment
[the first embodiment]
With reference to accompanying drawing, the first embodiment of the present invention is described.The first embodiment is the embodiment that first invention described.
[the first embodiment 1]
(one-piece construction)
Fig. 1 means the key diagram of structure of the magnetic pattern detecting apparatus with magnetic sensor device of first embodiment of the invention 1, Fig. 1 (a) is the key diagram that schematically represents the primary structure of magnetic pattern detecting apparatus, and Fig. 1 (b) is the key diagram that schematically represents cross section structure.
Magnetic pattern detecting apparatus 100 shown in Fig. 1 is from the media such as bank money, securities 1, to detect the conveyer 10 that medium 1 that magnetic utilizes roller, guiding piece (not shown) etc. to make sheet to distinguish the true from the false and the device of kind, to have moves along medium mobile route 11 and the magnetic sensor device 20 that detects magnetic in the half-way of the medium mobile route 11 being transmitted by this conveyer 10 from medium 1.In present embodiment, roller, guiding piece are by forming such as nonmagnetic substances such as aluminium.In present embodiment, magnetic sensor device 20 is arranged on the below of medium mobile route 11, but is sometimes also arranged on the top of medium mobile route 11.No matter be any situation, magnetic sensor device 20 is all arranged so that sensor cover 21 is towards medium mobile route 11.
In present embodiment, for medium 1, in the narrower magnetic regions 1a of the width of the moving direction X extension along medium 1, have the magnetic pattern forming with magnetic ink, described magnetic pattern is formed by residual magnetic flux density Br and the different multiple magnetic ink of magnetic permeability μ.For example, in medium 1, be formed with the second magnetic pattern that utilizes the first magnetic pattern that the magnetic ink printing containing hard magnetic material forms and utilize the magnetic ink printing containing soft magnetic material to form.Therefore, according to residual magnetic flux density value and magnetic permeability value, the two detects in medium 1, whether there is each magnetic pattern to the magnetic pattern detecting apparatus 100 of present embodiment.In addition, in present embodiment, for the magnetic sensor device 20 that described two kinds of magnetic patterns are detected, share.Thereby the magnetic pattern detecting apparatus 100 of present embodiment has following structure.
(structure of magnetic sensor device 20)
Fig. 2 is the key diagram of the magnetic sensor device 20 of first embodiment of the invention 1, Fig. 2 (a) means the key diagram of the layout of magnetic sensor element in magnetic sensor device 20 etc., Fig. 2 (b) mean magnetic sensor element towards key diagram.
As shown in Fig. 1 and Fig. 2 (a), in the magnetic pattern detecting apparatus 100 of present embodiment, magnetic sensor device 20 comprises: the magnetic field that applies magnetic field to medium 1 applies with magnet 30, detect to having applied the medium 1 behind magnetic field and apply the magnetic sensor element 40 of the magnetic flux under the state of bias magnetic field and having covered magnetic field and apply the non-magnetic shell 25 by magnet 30 and magnetic sensor element 40.Magnetic sensor device 20 comprises: with the inclined plane part 22,23 that medium mobile route 11 forms conplane sensor cover 21 roughly and is connected with this sensor cover 21 in the both sides of the moving direction of medium 1 with respect to sensor cover 21, its shape is by the shape defined of shell 25.
The side that magnetic sensor device 20 intersects at the moving direction X with medium 1 extends upward, magnetic field apply in the direction of intersecting at the moving direction X with medium 1 by magnet 30 and magnetic sensor element 40, be arranged with a plurality of.In present embodiment, on in the direction that magnetic sensor device 20 intersects at the moving direction X with medium 1 and medium Width Y moving direction X quadrature, extend, magnetic field applies and by magnet 30 and magnetic sensor element 40, on the medium Width Y (column direction) with moving direction X quadrature, is arranged with a plurality ofly, and equally spaced arranges in row.Therefore, if a plurality of magnetic sensor element 40 of arranging along medium Width Y are scanned, make it become successively conducting state, can detect the magnetic pattern of medium 1 on medium Width Y.In addition, if make concurrently medium 1 move with above-mentioned scanning, can detect whole magnetic patterns of medium 1 on moving direction X.In addition, said " conducting state " here, refers to the state of activation that magnetic sensor element 40 is applied hereinafter described excitation signal and the signal of magnetic sensor element 40 outputs is carried out to signal processing.
In present embodiment, magnetic field applies and with magnet 30, with respect to magnetic sensor element 40, is arranged on the both sides of the moving direction X of medium 1, as magnetic field, apply with the first magnet 31 and magnetic field and apply with the second magnet 32, along the moving direction of the medium 1 shown in arrow X1, be disposed with magnetic field and apply with the first magnet 31, magnetic sensor element 40 and magnetic field and apply with the second magnet 32.And along the moving direction of the medium 1 shown in arrow X2, being disposed with magnetic field applies with the second magnet 32, magnetic sensor element 40 and magnetic field and applies with the first magnet 31, no matter medium 1 is to move or move along the direction shown in arrow X2 along the direction shown in arrow X1, can detect the magnetic characteristic of medium 1.Here, magnetic sensor element 40 is arranged on magnetic field and applies with the first magnet 31 and magnetic field and apply with on the centre position between the second magnet 32, and magnetic field applies and with the standoff distance between the first magnet 31 and magnetic sensor element 40, equals magnetic field and apply with the standoff distance between the second magnet 32 and magnetic sensor element 40.In addition, magnetic field apply with the first magnet 31, magnetic sensor element 40 and magnetic field apply with the second magnet 32 be all arranged to the sensor cover 21 of magnetic sensor device 20 in opposite directions.
In present embodiment, magnetic field applies with magnet 30 (magnetic field applies with the first magnet 31 and magnetic field and applies with the second magnet 32) possesses the permanent magnets 35 such as ferrite, neodymium magnet.No matter be that magnetic field applies with the first magnet 31 or magnetic field and applies with the second magnet 32, a side that is positioned at sensor cover 21 of permanent magnet 35 and a side contrary from sensor cover 21 place one sides are all magnetized to different magnetic poles.Therefore, play as medium 1 is carried out to the effect of magnetized magnetizing surface 350 on the surface that is positioned at sensor cover 21 1 sides of permanent magnet 35.; in the magnetic pattern detecting apparatus 100 of present embodiment; as described later; when medium mobile as shown in arrow X1 1 passes through magnetic sensor device 20; first; from magnetic field, apply with the first magnet 31 and apply magnetic field to medium 1, by the medium 1 after described magnetic field magnetisation, passed through again magnetic sensor element 40.And when medium mobile as shown in arrow X2 1 passes through magnetic sensor device 20, first, from magnetic field, apply and to medium 1, apply magnetic field with the second magnet 32, by the medium 1 after described magnetic field magnetisation, passed through again magnetic sensor element 40.
Magnetic field applies with a plurality of permanent magnets 35 that use in magnet 30 all has same size and identical shaped, but is arranged to respectively following direction of magnetization.First, no matter be that magnetic field applies with the first magnet 31 or magnetic field and applies with the second magnet 32, at the upper adjacent permanent magnet 35 of medium Width (column direction) Y of the moving direction X quadrature with medium 1, all towards opposite directions, magnetize.; in a plurality of permanent magnets 35 of arranging on the medium Width Y of the moving direction X quadrature with medium 1; the end that is positioned at medium mobile route 11 1 sides of one of them permanent magnet 35 is magnetized into the N utmost point; the end that is positioned at a side contrary with medium mobile route 11 1 sides is magnetized into the S utmost point; and on the medium Width Y of the moving direction X quadrature with medium 1 permanent magnet 35 adjacent with this permanent magnet 35; its end that is positioned at medium mobile route 11 1 sides is magnetized into the S utmost point, and the end that is positioned at a side contrary with medium mobile route 11 1 sides is magnetized into the N utmost point.In addition, in present embodiment, for magnetic field in opposite directions on the moving direction at medium 1, apply with permanent magnet 35 and the magnetic field of the first magnet 31 and apply the permanent magnet 35 with the second magnet 32, with different magnetic poles, clip magnetic sensor element 40 and in opposite directions.In addition, for magnetic field in opposite directions on the moving direction at medium 1, apply with permanent magnet 35 and the magnetic field of the first magnet 31 and apply the permanent magnet 35 with the second magnet 32, be sometimes also arranged to clip magnetic sensor element 40 and in opposite directions with identical magnetic pole.
(structure of magnetic sensor element 40)
Fig. 3 is the key diagram of the magnetic sensor element 40 used in the magnetic sensor device 20 of first embodiment of the invention 1, Fig. 3 (a) is the front view of magnetic sensor element 40, Fig. 3 (b) is the key diagram to the excitation waveform of this magnetic sensor element 40, and Fig. 3 (c) is the key diagram from the output signal of magnetic sensor element 40.In Fig. 3 (a), represent the state that medium 1 moves in the direction vertical with paper.
As shown in Fig. 1 (b), magnetic sensor element 40 is all lamellar, and the size of Width W40 is greater than the size of thickness direction T40.Described magnetic sensor element 40 is arranged to the moving direction X towards medium 1 by thickness direction T40, and Width W40 is towards medium Width (column direction) Y of the moving direction X quadrature with medium 1.
By the thickness being formed by pottery etc., the laminal non-magnetic member 47 in 0.3mm～1.0mm left and right is covered on the two sides of magnetic sensor element 40, and the thickness direction of the whole magnetic sensor element 40 being included together with non-magnetic member 47 forms the thickness size (size T) of magnetic sensor element 40.Described magnetic sensor element 40 is also accommodated in magnetic shielding shell (not shown) sometimes.In this case, opening is carried out in the top at the medium mobile route place of magnetic shielding shell, the state of magnetic sensor element 40 in exposing to medium mobile route 11 from magnetic shielding shell.
As shown in Fig. 1 (b), Fig. 2 (a), Fig. 2 (b) and Fig. 3 (a), magnetic sensor element 40 comprises sensor magnetic core 41, be wound in the field coil 48 of sensor magnetic core 41 and be wound in the magnetic test coil 49 of sensor magnetic core 41.In present embodiment, sensor magnetic core 41 is included in the upper main part 42 extending of Width W40 of magnetic sensor element 40 and side-prominent poly-of the medium mobile route 11 1 from main part 42 to medium 1 teat 43 for magnetic.Here, poly-magnetic forms conduct from the both ends of the Width W40 of main part 42 to side-prominent 431,432, two teat 431,432 devices spaced apart on Width W40 for poly-magnetic of teat for two poly-magnetic of the medium mobile route 11 1 of medium 1 with teat 43.In addition, sensor magnetic core 41 has from main part 42 to contrary with poly-magnetic use teat 43 one side-prominent teat 44, in present embodiment, teat 44 forms as the both ends of the Width W40 from main part 42 to contrary side-prominent two teats 441,442 of medium mobile route 11 1 sides with medium 1.
For the sensor magnetic core 41 that adopts this structure, field coil 48 is wound in to the part being clipped with teat 431,432 by poly-magnetic on main part 42.In addition, magnetic test coil 49 is wound in and gathers teat 43 for magnetic, in present embodiment, magnetic test coil 49 comprises poly-magnetic in two teats 43 for poly-magnetic (poly-magnetic for teat 431,432) that are wound in sensor magnetic core 41 with the magnetic test coil 491 of teat 431 and is wound in the magnetic test coil 492 that gathers magnetic use teat 432.Here, two magnetic test coils 491,492 are oppositely wound in each other and gather teat 431,432 for magnetic.In addition, due to two magnetic test coils the 491, the 492nd, single line astragal is wound in continuously to poly-magnetic forms with teat 431,432, therefore two magnetic test coils 491,492 are in series electrically connected to.In addition also can, two magnetic test coils 491,492 being wound in respectively to poly-magnetic with after teat 431,432, realize in series and being electrically connected to.
Adopt the magnetic sensor element 40 of this structure be arranged to Width W40 and poly-magnetic with the projected direction (short transverse V40) of teat 43 the two all the thickness direction T40 of quadrature towards the moving direction X of medium 1, in magnetic sensor element 40, gather the Width W40 of teat 43 for magnetic (gathering teat 431,432 for magnetic) and magnetic test coil 49 (magnetic test coil 491,492) devices spaced apart towards medium Width (column direction) Y of the moving direction X quadrature with medium 1.
In magnetic sensor element 40, field coil 48 is applied to the excitation signal being formed by exchange current (with reference to Fig. 3 (b)) from the field circuit 50 describing with reference to Fig. 4 hereinafter.Therefore, as shown in Fig. 3 (a), at surrounding's formation bias magnetic field of sensor magnetic core 41, and from the signal of the detection waveform shown in magnetic test coil 49 output maps 3 (c).Here, the detection waveform shown in Fig. 3 (c) is the time diffusion signal of magnetic flux that excitation signal is produced, close with the time diffusion signal of excitation signal.
In present embodiment, as shown in Fig. 1 (b), the sensor magnetic core 41 of magnetic sensor element 40 adopts and between nonmagnetic first substrate 41a and nonmagnetic second substrate 41b, clips the structure of magnetic material layer 41c.In present embodiment, magnetic material layer 41c consists of laminal amorphous metal paper tinsel, this amorphous metal paper tinsel is formed by the magnetic material of amorphous (noncrystalline) metal, utilize adhesive linkage (not shown) and be bonded on a surface of first substrate 41a, second substrate 41b utilize adhesive linkage and with a surface engagement of described first substrate 41a, so that magnetic material layer 41c is clipped in the middle.Described adhesive linkage is all resin material to be immersed in the fibre reinforced materials such as glass fibre, carbon fiber, aramid fibre and formed prepreg is cured and the layer that forms, as resin material, use the heat reactive resins such as epoxy resin, phenolics class, polyester resin.The amorphous metal paper tinsel that magnetic material layer 41c is used is by being rolled and forming with roller, as cobalt class, can enumerate the non-crystaline amorphous metals such as Co-Fe-Ni-Mo-B-Si, Co-Fe-Ni-B-Si, as iron class, can enumerate the non-crystaline amorphous metals such as Fe-B-Si, Fe-B-Si-C, Fe-B-Si-Cr, Fe-Co-B-Si, Fe-Ni-Mo-B.First substrate 41a and second substrate 41b can enumerate the ceramic substrates such as aluminum oxide substrate, glass substrate etc., as long as can access enough rigidity, also can use plastic base.
(structure of signal processing part 60)
Fig. 4 means the block scheme of electric structure of the magnetic pattern detecting apparatus 100 of first embodiment of the invention 1, Fig. 4 (a) means the integrally-built key diagram of major part of circuit part, and Fig. 4 (b) means the key diagram of the enlarging section peripheral structure in circuit part.
In present embodiment, the circuit part 5 shown in Fig. 4 (a) and Fig. 4 (b) roughly comprises and using the exchange current shown in Fig. 3 (b) as excitation signal, is applied to the field circuit 50 of field coil 48 and the signal processing part 60 being electrically connected to magnetic test coil 49.Field circuit 50 comprise with a plurality of magnetic sensor element 40 shown in Fig. 2 respectively corresponding penultimate amplifier 51 for a plurality of excitations, for providing the traffic pilot 52 of excitation signal to a plurality of excitations with penultimate amplifier 51 successively and generating the amplifier 53 of excitation signal according to excitation command signal, this field circuit 50 provides and through excitation, with penultimate amplifier 51, has carried out the excitation signal after amplification to the field coil 48 of a plurality of magnetic sensor element 40 successively.
Signal processing part 60 is according to the sensor output signal of magnetic test coil 49 outputs of magnetic sensor device 20, generate the first signal S1 corresponding with residual magnetic flux density value and the secondary signal S2 corresponding with magnetic permeability value, whether above-mentioned control part (not shown), according to the relative position information between described first signal S1 and secondary signal S2 and medium 1 and magnetic sensor device 40, there is multiple magnetic pattern and forms position in detection medium 1.
More specifically, signal processing part 60 comprises enlarging section 70 that the sensor output signal of magnetic sensor element 40 output is amplified, from the signal of enlarging section 70 outputs, extracts the extraction unit 80 of peak value and valley and has the digital signal processing portion 90 of A/D converter 91.Extraction unit 80 comprises the skew adjustment part 83 that the amplifying signal of amplifier 70 outputs is outputed to traffic pilot 81, the clamp circuit 82 of rear class successively and the signal of clamp circuit 82 outputs is offset to adjustment.Clamp circuit 82 comprise to the sensor output signal after amplifying of enlarging section 70 output carry out rectification the first diode 821, the sensor output signal after amplifying of enlarging section 70 outputs is carried out to the polarity inversion circuit 822 of reversal of poles and to carried out the second diode 823 that the signal after reversal of poles carries out rectification in polarity inversion circuit 822.Thereby, skew adjustment part 83 comprises the output of the first diode 821 be offset the first offset adjusting circuit 831 of adjusting and the output of the second diode 823 be offset to the second offset adjusting circuit 832, the first offset adjusting circuits 831 and the second offset adjusting circuit 832 adjusted and comprises skew adjustment reference voltage generating circuit 831a, 832a and operational amplifier 831b, 832b.
In addition, extraction unit 80 is also provided with holding circuit 84 in the rear class of skew adjustment part 83, in the rear class of holding circuit 84, is also provided with gain setting portion 85.Holding circuit 84 comprises the first peak holding circuit 841 that the peak value of the output signal of the first offset adjusting circuit 831 is kept and the second peak holding circuit 842 that the peak value of the output signal of the second offset adjusting circuit 832 is kept.What to the second offset adjusting circuit 832, input here, is that 70 signals of exporting have carried out after reversal of poles, through the second diode 823, carried out the signal after rectification again through polarity inversion circuit 822 from enlarging section.Therefore, the second peak holding circuit 842 is equivalent to the valley hold circuit that the valley of the amplifying signal of enlarging section 70 outputs is kept.
Gain setting portion 85 comprises second amplifier 852 (main amplifier) for gain setting of the gain of the value that the gain setting of the gain of the value that setting the first peak holding circuit 841 keeps keeps with the first amplifier 851 (main amplifier) and setting the second peak holding circuit 842 (valley hold circuit), the value that this gain setting portion 85 keeps the first peak holding circuit 841 and the second peak holding circuit 842 is set as the gain of regulation, then outputs to the A/D converter 91 of digital signal processing portion 90.
Digital signal processing portion 90 comprises adding circuit 92 and subtraction circuit 93, wherein, the value that the value that adding circuit 92 keeps the first peak holding circuit 841 and the second peak holding circuit 842 keep is added, thereby generate first signal S1, the value that 93 values that the first peak holding circuit 841 is kept of subtraction circuit and the second peak holding circuit 842 keep is subtracted each other, thereby generates secondary signal S2.Digital signal processing portion 90 also comprises the control signal efferent 94 of output switching control signal, excitation command signal, offset control signal etc.Adopt the digital signal processing portion 90 of said structure to upper control part (not shown) output first signal S1 and secondary signal S2, in above-mentioned control part, based on first signal S1 and secondary signal S2, judge the true and false of medium 1.More specifically, in upper control part, be provided with detection unit, this detection unit is associated first signal S1 and secondary signal S2 with the relative position information between magnetic sensor element 40 and medium 1, contrast with pre-recorded Comparing patterns in recording unit, thereby judge the true and false of medium 1, the processing that described detection unit is stipulated based on pre-recorded program in the recording units such as ROM or RAM (not shown), thereby the true and false of judgement medium 1.
(detailed structure of enlarging section 70)
Fig. 5 is the key diagram that is input to the signal etc. of amplifier in the enlarging section 70 of magnetic pattern detecting apparatus 100 of first embodiment of the invention 1, Fig. 5 (a) means the key diagram of the waveform of excitation signal, sensor output signal and reference voltage, and 5 (b) mean and with enlarging section, the difference of sensor output signal and reference voltage carried out the key diagram of the waveform after amplification.In Fig. 5 (a) and Fig. 5 (b), with solid line, L1 represents excitation signal, with solid line, L2 represents sensor output signal, and with solid line, L3 represents reference voltage, with solid line L4, represents, with amplifier, the difference of sensor output signal and reference voltage has been carried out amplifying signal afterwards.
In the magnetic pattern detecting apparatus 100 of present embodiment, enlarging section 70 is as shown in Fig. 4 (b), have and a plurality of magnetic sensor element 40 corresponding a plurality of amplifiers 71 (prime amplifier) respectively, to described amplifier 71 input reference voltages and the sensor output signal exported from magnetic sensor element 40.Here, enlarging section 70 possesses and generates the signal that changes in linkage with excitation signal as the reference voltage generating unit 72 of reference voltage, and in present embodiment, the signal generating to amplifier 71 input reference voltage generating units 72 is as reference voltage.
In present embodiment, reference voltage has in Fig. 5 (a) and Fig. 5 (b) uses the waveform shown in solid line L3, this waveform to be equivalent to the excitation signal shown in solid line L1, carry out the waveform obtaining after differential in Fig. 5 (a).Therefore, reference voltage can change in linkage with excitation signal.More specifically, in present embodiment, the CR differentiating circuit 73 that reference voltage generating unit 72 is comprised of capacitor C and resistance R, the signal that these CR differentiating circuit 73 generations have been carried out obtaining after differential to excitation signal is as reference voltage.Here, time diffusion due to the magnetic flux that is equivalent to excitation signal to produce with the sensor output signal shown in solid line L2 in Fig. 5 (a) and Fig. 5 (b), therefore the reference voltage that, excitation signal is carried out obtaining after differential is synchronizeed with sensor output signal.If said reference voltage, as shown in Fig. 5 (b), because the difference of this reference voltage and sensor output signal is less, therefore, even if improve the gain of amplifier 71, the output signal of amplifier 71 can not reach capacity yet, but as used as shown in solid line L4 in Fig. 5 (b).
(detection principle)
Fig. 6 means in the magnetic pattern detecting apparatus 100 of first embodiment of the invention 1 key diagram to the characteristic of the various magnetic inks that form on medium 1 etc.Fig. 7 means in the magnetic pattern detecting apparatus 100 of first embodiment of the invention 1 key diagram that detects the principle that whether has magnetic pattern from be formed with the medium 1 of different types of magnetic pattern.
First, illustrate and at medium 1, when the direction of the arrow X1 shown in Fig. 1 and Fig. 2 moves, judge the principle of the true and false of medium 1.In present embodiment, in the magnetic regions 1a of medium 1, be formed with the multiple magnetic pattern that residual magnetic flux density Br and magnetic permeability μ are different.More specifically, in medium 1, be formed with the second magnetic pattern that utilizes the first magnetic pattern that the magnetic ink printing containing hard magnetic material forms and utilize the magnetic ink printing containing soft magnetic material to form.Here, contain the magnetic ink of hard magnetic material as utilized the residual magnetic flux density Br shown in magnetic hysteresis loop and magnetic permeability μ etc. in Fig. 6 (b1), the value that has applied the residual magnetic flux density Br behind magnetic field is higher, but magnetic permeability μ is lower.In contrast to this, contain the magnetic ink of soft magnetic material as shown in its magnetic hysteresis loop in Fig. 6 (c1), the value that has applied the residual magnetic flux density Br behind magnetic field is lower, but magnetic permeability μ is higher.
Thereby, as described below, as long as measure residual magnetic flux density Br and magnetic permeability μ, just can differentiate the material of magnetic ink.More specifically, because magnetic permeability μ is relevant to coercivity H, so in present embodiment, just measure residual magnetic flux density Br and coercivity H, the ratio of described residual magnetic flux density Br and coercivity H is because of the difference difference of magnetic ink (magnetic material).Thereby, can differentiate the material of magnetic ink.In addition, although the measured value of residual magnetic flux density Br and magnetic permeability μ (coercivity H) can be because of deep or light, the medium 1 of ink and the distance change between magnetic sensor device 20, but in present embodiment, because magnetic sensor device 20 is to measure residual magnetic flux density Br and magnetic permeability μ (coercivity H) at same position, therefore according to the ratio of residual magnetic flux density Br and coercivity H, can differentiate reliably the material of magnetic ink.
In the magnetic pattern detecting apparatus 100 of present embodiment, at medium 1, along the direction shown in arrow X1, move and when the magnetic sensor device 20, first, from magnetic field, apply with the first magnet 31 and apply magnetic field to medium 1, be applied in the medium 1 behind magnetic field by magnetic sensor element 40.During this, as shown in Fig. 6 (a3), from the magnetic test coil 49 output signal corresponding with the BH curve of the sensor magnetic core 41 shown in Fig. 6 (a2) of magnetic sensor element 40.Thereby the first signal S1 exporting from the adding circuit 92 shown in Fig. 4 and the secondary signal S2 exporting from subtraction circuit 93 are respectively shown in Fig. 6 (a4).
Here, if utilize the magnetic ink of the hard magnetic materials such as contain ferrite powder to form the first magnetic pattern on medium 1, described the first magnetic pattern, as shown in Fig. 6 (b1), has the residual magnetic flux density Br of high magnitude.Therefore, as shown in Fig. 7 (a1), when medium 1 has passed through magnetic field, apply when the magnet 30, the first magnetic pattern becomes magnet because coming self-magnetic field to apply with the magnetic field of magnet 30.Therefore, the signal of exporting from the magnetic test coil 49 of magnetic sensor element 40, as shown in Fig. 6 (b2), because the first magnetic pattern is subject to direct current biasing, becomes the waveform shown in Fig. 6 (b3) and Fig. 7 (a2).That is, the crest voltage of signal S0 and valley point voltage, as shown in arrow A 1, A2, be offset in the same direction, and the side-play amount of crest voltage are different with the side-play amount of valley point voltage.And described signal S0 changes along with moving of medium 1.Thereby, from the first signal S1 of adding circuit 92 output shown in Fig. 4 as shown in Fig. 6 (b4), whenever the first magnetic pattern of medium 1 during by magnetic sensor element 40 with regard to change.Here, because the magnetic permeability μ of the first magnetic pattern by forming containing the magnetic ink of hard magnetic material is lower, so affect the crest voltage of signal S0 and the skew of valley point voltage, can be considered the residual magnetic flux density Br that only has the first magnetic pattern.Thereby, even the first magnetic pattern of medium 1 by magnetic sensor element 40, can change from the secondary signal S2 of subtraction circuit 93 outputs shown in Fig. 4 yet, identical with the signal shown in Fig. 6 (b4).
In contrast to this, if utilize the magnetic ink containing soft magnetic materials such as soft magnetism stainless steel powders to form the second magnetic pattern on medium, the magnetic hysteresis loop of described the second magnetic pattern is as shown in Fig. 6 (c1), through the inner side of the B-H loop by formed the first magnetic pattern of magnetic ink containing hard magnetic material shown in Fig. 6 (b1), the value of residual magnetic flux density Br is lower.Therefore,, even if medium 1 applies with after magnet 30 by magnetic field, the value of the residual magnetic flux density Br of the second magnetic pattern is still lower.But, because the magnetic permeability μ of the second magnetic pattern is higher, therefore, as shown in Fig. 7 (b1), play the effect as magnetic.Therefore, the signal of exporting from the magnetic test coil 49 of magnetic sensor element 40 is as shown in Fig. 6 (c2), due to the existence of the second magnetic pattern, large thereby magnetic permeability μ becomes, and correspondingly becomes the waveform shown in Fig. 6 (c3) and Fig. 7 (b2).That is, the crest voltage of signal S0 is moved towards a higher lateral deviation as shown in arrow A 3, and valley point voltage moves towards a lower lateral deviation as shown in arrow A 4.Now, the side-play amount of crest voltage and its absolute value of the side-play amount of valley point voltage are about equally.And described signal S0 changes along with moving of medium 1.Thereby, from the secondary signal S2 of subtraction circuit 93 output shown in Fig. 4 as shown in Fig. 6 (c4), whenever the second magnetic pattern of medium 1 during by magnetic sensor element 40 with regard to change.Here, because the residual magnetic flux density Br of the second magnetic pattern by forming containing the magnetic ink of soft magnetic material is lower, so the skew of the crest voltage of signal and valley point voltage is exerted an influence, can be considered the magnetic permeability μ that only has the second magnetic pattern.Thereby, even if the second magnetic pattern of medium 1 is by magnetic sensor element 40, from the also not change of first signal S1 of adding circuit 92 outputs shown in Fig. 4, identical with the signal shown in Fig. 6 (c4).
Thereby, in the magnetic pattern detecting apparatus 100 of present embodiment, the first signal S1 obtaining the peak value of the signal from magnetic sensor element 40 outputs being added with valley with adding circuit 92 is the signal corresponding with the residual magnetic flux density value of magnetic pattern, if monitor described first signal S1, can detect and whether have the first magnetic pattern being formed by the magnetic ink containing hard magnetic material and form position.And the secondary signal S2 obtaining the peak value of the signal from magnetic sensor element 40 outputs being subtracted each other with valley with subtraction circuit 93 is the signal corresponding with the magnetic permeability μ of magnetic pattern, if monitor described secondary signal S2, can detect and whether have the second magnetic pattern being formed by the magnetic ink containing soft magnetic material and form position.Thereby, can be according to residual magnetic flux density value and magnetic permeability value the two identify whether to exist in medium 1 and apply each magnetic pattern of the multiple magnetic pattern that residual magnetic flux density Br and magnetic permeability μ are different behind magnetic field and form position.
(the main effect of the first embodiment 1)
As mentioned above, in the enlarging section 70 of the signal processing part 60 of the magnetic pattern detecting apparatus 100 of present embodiment, in the time will having carried out sensor output signal that the magnetic sensor element 40 of excitation exports to amplifier 71 input reference voltages with by excitation signal, just in reference voltage generating unit 72, generate the signal changing in linkage with excitation signal, and using described signal as reference voltage input amplifier 71.Therefore, reference voltage is less with the difference of the sensor output signal of exporting from magnetic sensor element 40.Thereby, even if do not append the circuit that bridge circuit etc. can cause cost to increase, the gain that also can improve amplifier 71, and can improve S/N ratio.And, because reference voltage is to change in linkage with excitation signal, so sensor output signal is synchronizeed with reference voltage, therefore can suitably to sensor output signal, amplify.
In addition, because reference voltage generating unit 72 generates, there is the signal that excitation signal has been carried out to the waveform that obtains after differential and be used as reference voltage, therefore can reduce the poor of sensor output signal and reference voltage.; the time diffusion of the magnetic flux that is equivalent to excitation signal to produce due to sensor output signal; therefore if use, excitation signal has been carried out to the signal of the waveform that obtains after differential as the reference voltage of amplifier 71; the difference of sensor output signal and reference voltage is less, thereby can improve gain.
In addition, because reference voltage generating unit 72 has, thereby excitation signal is carried out to the CR differentiating circuit 73 that differential generates reference voltage, therefore use electronic component inexpensive such as capacitor C, resistance R, thereby just can carry out differential to excitation signal, generate reference voltage.
In addition, in the magnetic pattern detecting apparatus 100 of present embodiment, because being shares magnetic sensor device 20, according to residual magnetic flux density value and magnetic permeability value, the two detects and whether has each magnetic pattern and form position, therefore can generation time between the mensuration of residual magnetic flux density value and the mensuration of magnetic permeability value not poor.Thereby, even while in the situation that magnetic sensor device 20 and medium 1 being moved measure, signal processing part 60 also can carry out high-precision detection with simple structure.Therefore in addition, for conveyer 10, also only at it, on the position by magnetic sensor device 20, require operation stability, can try hard to simplified structure.
And, according to the magnetic pattern detecting apparatus 100 of present embodiment, for utilizing containing the two magnetic ink of hard magnetic material and soft magnetic material, be formed with the medium 1 of magnetic pattern or utilize the medium 1 that is formed with magnetic pattern containing the magnetic ink of material that is positioned at the centre of hard magnetic material and soft magnetic material, also can carry out the detection of magnetic pattern.; for magnetic characteristic, be positioned at the such magnetic pattern in centre of the first magnetic pattern and the second magnetic pattern; as shown in Fig. 6 (d1); because magnetic hysteresis loop is positioned at the centre of the magnetic hysteresis loop of magnetic pattern of the hard magnetic material shown in Fig. 6 (b1) and the magnetic hysteresis loop of the magnetic pattern of the soft magnetic material shown in Fig. 6 (c1); therefore can obtain the signal pattern shown in Fig. 6 (d4); for described magnetic pattern, also can detect it and whether have and form position.
And in the magnetic sensor device 20 of present embodiment, magnetic field applies and is provided as magnetic field with magnet 30 with respect to magnetic sensor element 40 in the both sides of the moving direction of medium 1 and applies with the first magnet 31 and magnetic field and apply with the second magnet 32.Therefore, as shown in Figure 1, utilizing magnetic field to apply with 31 pairs of media 1 that move along the direction shown in arrow X1 of the first magnet magnetizes, afterwards, utilize magnetic sensor element 40, can detect to the medium 1 after magnetization and apply the magnetic flux under the state of bias magnetic field, and utilizing magnetic field to apply with 32 pairs of media 1 that move along the direction shown in arrow X2 of the second magnet magnetizes, afterwards, utilize magnetic sensor element 40, can detect to the medium 1 after magnetization and apply the magnetic flux under the state of bias magnetic field.Thereby, if by the magnetic pattern detecting apparatus of present embodiment 100 for automatic teller machine, can judge the true and false of deposited in medium 1, and also can judge the true and false of the medium 1 that will take out.
[the first embodiment 2]
Fig. 8 means the key diagram of enlarging section 70 peripheral structures in the circuit part of magnetic pattern detecting apparatus 100 of first embodiment of the invention 2.In addition, because the basic structure of present embodiment is identical with embodiment 1, therefore for the additional identical label of common part, and the description thereof will be omitted.
In the first embodiment 1, enlarging section 70 is provided with a plurality of amplifiers 71 corresponding with a plurality of magnetic sensor element 40 difference, but in the present embodiment, as shown in Figure 8, rear class in a plurality of magnetic sensor element 40 arranges traffic pilot 77, and in the rear class of traffic pilot 77, amplifier 71 is set.Therefore, from the sensor output signal of a plurality of magnetic sensor element 40 outputs, by traffic pilot 77, output to successively amplifier 71.Therefore, as long as just can be to amplifying from the sensor output signal of a plurality of magnetic sensor element 40 outputs with an amplifier 71.
In addition, present embodiment is also identical with the first embodiment 1, and in enlarging section 70, the reference voltage generating unit 72 that is provided with CR differentiating circuit 73 generates the signal changing in linkage with excitation signal, and using described signal as reference voltage, is input to amplifier 71.Therefore, because reference voltage is less with the difference of the sensor output signal of exporting from magnetic sensor element 40, even thereby do not append the circuit that bridge circuit etc. can cause cost to raise, also can improve the gain of amplifier 71 etc., can realize the effect identical with embodiment 1 like that.
In addition, in the first embodiment 1, be provided with and a plurality of magnetic sensor element 40 corresponding a plurality of penultimate amplifier 51 for excitation respectively, but in the present embodiment, in excitation, by the rear class of penultimate amplifier 51, traffic pilot 54 is set, and in the rear class of traffic pilot 54, a plurality of magnetic sensor element 40 is set.Therefore, from excitation, with the excitation signal of penultimate amplifier 51 outputs, by traffic pilot 54, output to successively a plurality of magnetic sensor element 40.Thereby, as long as just can provide excitation signal to a plurality of magnetic sensor element 40 by an excitation with penultimate amplifier 51.
In addition, when traffic pilot 77 is switched this unwanted signal, such as noise producing etc., can not enter rear class when with traffic pilot 77 change detection signal, also can finely tune the switching sequence of traffic pilot 77, but also can be as shown in Figure 8, in the output stage of amplifier 71, append analog switch 79, thereby make noise etc. can not enter rear class.
[the first embodiment 3]
Fig. 9 means the key diagram of structure of enlarging section 70 of the magnetic pattern detecting apparatus 100 of first embodiment of the invention 3, and Fig. 9 (a) means the key diagram of the peripheral structure of enlarging section 70, and Fig. 9 (b) is the key diagram of illusory magnetic sensor element.In addition, because the basic structure of present embodiment is identical with the first embodiment 1,2, therefore for the additional identical label of common part, and the description thereof will be omitted.
In the first embodiment 1,2, used the reference voltage generating unit 72 with CR differentiating circuit 73, but in the present embodiment, as shown in Fig. 9 (a), setting be the reference voltage generating unit 72 with illusory magnetic sensor element 74.Thereby, utilize illusory magnetic sensor element 74, can generate the signal changing in linkage with excitation signal, and be input to amplifier 71 using described signal as reference voltage.Here, illusory magnetic sensor element 74 is arranged on the position of the medium mobile route 11 leaving shown in Fig. 1, thereby is not subject to the magnetic influence from medium 1 and magnetic sensor element 40.
Above-mentioned illusory magnetic sensor element 74 is as shown in Fig. 9 (b), there is the structure identical with the magnetic sensor element 40 being illustrated with reference to Fig. 2 (b) and Fig. 3 (b), there is the structure of reel field coil 48 and magnetic test coil 49 on sensor magnetic core 41.In addition, by illusory excitation, with penultimate amplifier 510, to the field coil 48 of illusory magnetic sensor element 74, provide excitation signal, and offer amplifier 71 using the output of the magnetic test coil of illusory magnetic sensor element 74 49 as reference voltage.
Adopt in the enlarging section 70 of this structure, illusory magnetic sensor element 74 is carried out excitation by excitation signal, and the signal that excitation signal is carried out to differential and obtain is exported from magnetic test coil 49.Here, the time diffusion of the magnetic flux that the output signal of illusory magnetic sensor element 74 is equivalent to excitation signal to produce, is excitation signal have been carried out to the signal of the waveform that obtains after differential.Therefore, owing to making, the difference of reference voltage and sensor output signal is minimum, thereby can improve gain.
In addition, in present embodiment, on the basis of the first embodiment 2, be provided with the reference voltage generating unit 72 with illusory magnetic sensor element 74, but also the reference voltage generating unit 72 with illusory magnetic sensor element 74 can be set on the basis of embodiment 1.
[the first embodiment 4]
Figure 10 means the key diagram of peripheral structure of enlarging section 70 of the magnetic pattern detecting apparatus 100 of first embodiment of the invention 4.In addition, because the basic structure of present embodiment is identical with the first embodiment 1～3, therefore for the additional identical label of common part, and the description thereof will be omitted.
In the first embodiment 1～3, rear class at clamp circuit 82 is provided with skew adjustment part 83, but in the present embodiment, as shown in figure 10, in skew adjustment part 83, operational amplifier 832b to the operational amplifier 831b of the first offset adjusting circuit 831 and the second offset adjusting circuit 832 arranges electric capacity, and the first offset adjusting circuit 831 and the second offset adjusting circuit 832 form respectively as first integral circuit 835 and second integral circuit 836.
Therefore, 835 pairs, the first integral circuit polarity from the signals of amplifier 71 outputs is that positive component of signal is carried out integration, and second integral circuit 836 is that negative component of signal is carried out integration to polarity wherein.Thereby, even if the pulsewidth of the signal of exporting from amplifier 71 is very narrow, but owing to can be also that positive component of signal and polarity is that negative component of signal is carried out respectively integration to polarity, thereby amplitude variations be converted to area change, therefore by simple structure, just can improves apparent gain.
In addition, present embodiment is also identical with the first embodiment 1, and in enlarging section 70, the reference voltage generating unit 72 that is provided with CR differentiating circuit 73 generates the signal changing in linkage with excitation signal, and using described signal as reference voltage, is input to amplifier 71.Therefore, because reference voltage is less with the difference of the sensor output signal of exporting from magnetic sensor element 40, even thereby do not append the circuit that bridge circuit etc. can cause cost to raise, also can improve the gain of amplifier 71 etc., can realize the effect identical with embodiment 1 like that.
In addition, present embodiment has adopted the structure that integrating circuit is set on the basis of the first embodiment 1, but also can adopt the structure that integrating circuit is set in the first embodiment 2,3.
[the first embodiment 5]
Figure 11 means the key diagram of peripheral structure of skew adjustment part 83 of the magnetic pattern detecting apparatus 100 of first embodiment of the invention 5.In addition, because the basic structure of present embodiment is identical with the first embodiment 1～4, therefore for the additional identical label of common part, and the description thereof will be omitted.
In the first embodiment 1～4, in enlarging section 70, be provided with reference voltage generating unit 72, but in the present embodiment, as shown in figure 11, reference voltage generating unit 72 is not set in enlarging section 70, and the reference voltage of amplifier 71 is the set potentials such as earthing potential.
But, present embodiment is identical with the first embodiment 4, in skew adjustment part 83, operational amplifier 832b to the operational amplifier 831b of the first offset adjusting circuit 831 and the second offset adjusting circuit 832 arranges electric capacity, and the first offset adjusting circuit 831 and the second offset adjusting circuit 832 form respectively as first integral circuit 835 and second integral circuit 836.Therefore, 835 pairs of signal Semi-polarities of exporting from magnetic sensor element 40 of first integral circuit are that positive component of signal is carried out integration, and second integral circuit 836 is that negative component of signal is carried out integration to its Semi-polarity.Thereby, even if the pulsewidth of the signal of exporting from amplifier 71 is very narrow, but owing to can be also that positive component of signal and polarity is that negative component of signal is carried out respectively integration to polarity, thereby amplitude variations be converted to area change, therefore by simple structure, just can improves apparent gain.
[the first embodiment 6]
Figure 12 is the key diagram of the magnetic sensor element 40 used in the magnetic pattern detecting apparatus 100 of first embodiment of the invention 6.In addition, because the basic structure of present embodiment is identical with the first embodiment 1～5, therefore for the additional identical label of common part, and the description thereof will be omitted.
In the first embodiment 1～5, in magnetic sensor element 40 and magnetic test coil 49, only field coil 48 is applied to excitation signal, but in the present embodiment, as shown in figure 12, field coil 48 and magnetic test coil 49 are connected in series, field coil 48 and magnetic test coil 49 are all applied to excitation signal.And, amplifier 71 is connected with the coupling part between magnetic test coil 49 with field coil 48, signal is carried out to differential output from the coupling part between field coil 48 and magnetic test coil 49 to amplifier 71.
Like this, in the present embodiment, be provided with two coils (field coil 48 and magnetic test coil 49) for exporting sensor output signal as differential output, differential output signal is exported to amplifier 71.Therefore, can absorb the external disturbance such as temperature variation.
In addition, present embodiment is also identical with the first embodiment 1, and in enlarging section 70, the reference voltage generating unit 72 that is provided with CR differentiating circuit 73 generates the signal changing in linkage with excitation signal, and using described signal as reference voltage, is input to amplifier 71.Therefore, because reference voltage is less with the difference of the sensor output signal of exporting from magnetic sensor element 40, even thereby do not append the circuit that bridge circuit etc. can cause cost to raise, also can improve the gain of amplifier 71 etc., can realize the effect identical with the first embodiment 1 like that.
In addition, present embodiment has adopted the structure that integrating circuit is set on the basis of the first embodiment 1, but also can adopt the structure of utilizing the differential output of magnetic sensor element 40 in the first embodiment 2～5.
(other embodiment of the first embodiment)
In above-mentioned embodiment, when medium 1 and magnetic sensor device 20 are relatively moved, be that medium 1 is moved, but also can adopt the fixing and structure that magnetic sensor device 20 moves of medium 1.In addition, in above-mentioned embodiment, used permanent magnet to apply with magnet 30 as magnetic field, but also can use electromagnet.
[the second embodiment]
With reference to accompanying drawing, the second embodiment of the present invention is described.In addition, the second embodiment is the embodiment that second invention described.Structure about the magnetic pattern detecting apparatus in the second embodiment, the structure of the magnetic sensor device using in magnetic pattern detecting apparatus, the structure of the magnetic sensor element of using in magnetic sensor device, the characteristic of the various magnetic inks that form in medium etc., in magnetic pattern detecting apparatus, from be formed with the medium of different types of magnetic pattern, detect the principle that whether has magnetic pattern, due to the Fig. 1 that can use with the first embodiment, Fig. 2, Fig. 3, Fig. 6, the magnetic pattern detecting apparatus that Fig. 7 records, magnetic sensor device, magnetic sensor element, the characteristic of magnetic ink etc., detect the identical structure of principle that whether has magnetic pattern, characteristic etc., principle, therefore, here to its detailed description of identical incomplete structure.
[the second embodiment 1]
(structure of signal processing part 60)
Figure 13 means the key diagram of electric structure of the magnetic pattern detecting apparatus 100 of second embodiment of the invention 1, Figure 13 (a) means the integrally-built key diagram of major part of circuit part, Figure 13 (b) thus mean the key diagram that a plurality of magnetic sensor element is scanned to the situation that becomes successively conducting state.In addition, because the basic structure of the circuit part of the present embodiment shown in Figure 13 (a) is identical with the structure of the circuit part of the first embodiment 1 of recording in Fig. 4 (a), therefore for the additional identical label of common part, describe.
In present embodiment, the circuit part 5 shown in Figure 13 (a) roughly comprises: using the exchange current shown in Fig. 3 (b) as excitation signal, be applied to the field circuit 50 of field coil 48 and the signal processing part 60 being electrically connected to the magnetic test coil 49 (with reference to Fig. 2 (b) and Fig. 3 (a)) of magnetic sensor element 40.Field circuit 50 comprises: with a plurality of magnetic sensor element 40 shown in Fig. 2 respectively corresponding penultimate amplifier 51 for a plurality of excitations, for providing the traffic pilot 52 of excitation signal to a plurality of excitations with penultimate amplifier 51 successively and generating the amplifier 53 of excitation signal according to excitation command signal, this field circuit 50 provides and through excitation, with penultimate amplifier 51, has carried out the excitation signal after amplification to the field coil 48 (with reference to Fig. 2 (b) and Fig. 3 (a)) of a plurality of magnetic sensor element 40 successively.The shared penultimate amplifier 51 for excitation of a plurality of magnetic sensor element 40 also can be set in the rear class of traffic pilot 52 sometimes.
Signal processing part 60 is according to the sensor output signal of magnetic test coil 49 outputs from magnetic sensor device 20, generate the first signal S1 corresponding with residual magnetic flux density value and the secondary signal S2 corresponding with magnetic permeability value, and they are outputed to upper control part (not shown).
More specifically, signal processing part 60 comprises enlarging section 70, extraction unit 80 and digital signal processing portion 90, wherein, enlarging section 70 has the amplifier 71 that the sensor output signal of magnetic sensor element 40 outputs is amplified, extraction unit 80 extracts peak value and valley from the signal of enlarging section 70 outputs, and digital signal processing portion 90 has A/D converter 91.Extraction unit 80 comprises the offset adjusting circuit 83 that the amplifying signal of amplifier 70 outputs is outputed to traffic pilot 81, the clamp circuit 82 of rear class successively and the signal of clamp circuit 82 outputs is offset to adjustment.Clamp circuit 82 comprise to the sensor output signal after amplifying of enlarging section 70 output carry out rectification the first diode 821, the sensor output signal after amplifying of enlarging section 70 outputs is carried out to the polarity inversion circuit 822 of reversal of poles and to carried out the second diode 823 that the signal after reversal of poles carries out rectification in polarity inversion circuit 822.Thereby, offset adjusting circuit 83 comprises the output of the first diode 821 to be offset the first offset adjusting circuit 831 of adjusting and the output of the second diode 823 be offset to the second offset adjusting circuit 832, the first offset adjusting circuits 831 of adjusting and the second offset adjusting circuit 832 and comprises that skew adjustment uses reference voltage generating circuit 831a, 832a and operational amplifier 831b, 832b.Sometimes also the shared amplifier 71 of a plurality of magnetic sensor element 40 can be set in the rear class of traffic pilot 81.
In addition, extraction unit 80 is also provided with holding circuit 84 in the rear class of offset adjusting circuit 83, in the rear class of holding circuit 84, is also provided with gain setting portion 85.Holding circuit 84 comprises the first peak holding circuit 841 that the peak value of the output signal of the first offset adjusting circuit 831 is kept and the second peak holding circuit 842 that the peak value of the output signal of the second offset adjusting circuit 832 is kept.What to the second offset adjusting circuit 832, input here, is that 70 signals of exporting have carried out after reversal of poles, through the second diode 823, carried out the signal after rectification again through polarity inversion circuit 822 from enlarging section.Therefore, the second peak holding circuit 842 is equivalent to the valley hold circuit that the valley of the amplifying signal of enlarging section 70 outputs is kept.
Gain setting portion 85 comprises: second amplifier 852 for gain setting of the gain of the value that the gain setting of the gain of the value that setting the first peak holding circuit 841 keeps keeps with the first amplifier 851 and setting the second peak holding circuit 842 (valley hold circuit), the value that this gain setting portion 85 keeps the first peak holding circuit 841 and the second peak holding circuit 842 is set as the gain of regulation, then outputs to the A/D converter 91 of digital signal processing portion 90.
Digital signal processing portion 90 comprises A/D converter 91, adding circuit 92 and subtraction circuit 93, wherein, the value that the value that adding circuit 92 keeps the first peak holding circuit 841 and the second peak holding circuit 842 keep is added, thereby generate first signal S1, the value that 93 values that the first peak holding circuit 841 is kept of subtraction circuit and the second peak holding circuit 842 keep is subtracted each other, thereby generates secondary signal S2.
Here, magnetic sensor element 40 as described later, in order to determine the magnetic characteristic in a region on medium 1, is exported a plurality of signals (being four signals in present embodiment) in a scan period.Therefore, digital signal processing portion 90 is provided with to handle averagely portion 96 in the rear class of A/D converter 91.Thereby, after four values that the first peak holding circuit 841 and the second peak holding circuit 842 kept at A/D converter 91 are converted to digital signal, to handle averagely portion 96 averages processing to these four values, and adding circuit 92 utilizes the value obtaining after above-mentioned to handle averagely to carry out addition process.In addition, after four values that the first peak holding circuit 841 and the second peak holding circuit 842 kept at A/D converter 91 are converted to digital signal, to handle averagely portion 96 averages processing to these four values, and 93 of subtraction circuits utilize the value obtaining after above-mentioned to handle averagely to carry out subtraction process.
Digital signal processing portion 90 has the control signal efferent 94 of output switching control signal, excitation command signal, offset control signal etc., switch-over control signal is controlled traffic pilot 52,81, and controls as shown in Fig. 2 (a), Fig. 2 (b) and Fig. 3 (b) on medium Width, namely on the moving direction with medium 1 is the column direction Y of line direction X quadrature, is arranged with the sequential of scanning motion and other circuit operation of a plurality of magnetic sensor element 40.
Adopt the digital signal processing portion 90 of said structure to upper control part (not shown) output first signal S1 and secondary signal S2, in above-mentioned control part, based on first signal S1 and secondary signal S2, judge the true and false of medium 1.More specifically, in upper control part, be provided with detection unit, this detection unit is associated first signal S1 and secondary signal S2 with the relative position information between magnetic sensor element 40 and medium 1, contrast with pre-recorded Comparing patterns in recording unit, thereby judge the true and false of medium 1, the processing that described detection unit is stipulated based on pre-recorded program in the recording units such as ROM or RAM (not shown), thereby the true and false of judgement medium 1.
(scanning motion of magnetic sensor element 40)
Figure 14 means the key diagram of scanning motion etc. of the magnetic pattern detecting apparatus 100 of second embodiment of the invention 1, Figure 14 (a) is the key diagram that plane earth represents the situation that magnetic sensor element 40 is arranged on column direction Y, Figure 14 (b) amplifies to the layout of magnetic sensor element the key diagram representing, Figure 14 (c) means the key diagram of residing position mobile situation on medium 1 when the magnetic sensor element in conducting state scans at every turn in the scan period, Figure 14 (d) is that residing position mobile situation on medium 1 is further amplified the key diagram of expression when in the scan period, the magnetic sensor element in conducting state scans at every turn.Figure 15 means the key diagram of operation condition of circuit part of the magnetic pattern detecting apparatus 100 of second embodiment of the invention 1, Figure 15 (a) means the frequency of detection signal and the key diagram that sampling keeps the relation between action, and Figure 15 (b) means the key diagram of the frequency characteristic of the to handle averagely portion 96 shown in A/D converter 91 and Figure 13 (a).
As shown in Figure 14 (a) and Figure 14 (b), in the magnetic pattern detecting apparatus 100 of present embodiment, on the column direction Y of the moving direction X quadrature with medium 1 (medium Width), be arranged with 20 magnetic sensor element 40 and be respectively used to channel C H1～CH20, by on column direction Y, these 20 magnetic sensor element 40 being scanned, from the whole Width of medium 1, detect magnetic pattern.That is to say, as long as a plurality of magnetic sensor element 40 are scanned on column direction, just 20 magnetic sensor element 40 of the enough channel C H1～CH20 of energy detect respectively data.And medium 1 is mobile along line direction (moving direction X).Therefore, can detect magnetic pattern from whole medium 1.
Adopt the magnetic pattern detecting apparatus 100 of said structure in the present embodiment, the translational speed of the medium being transmitted by connecting gear 10 1 is made as to v (mm/ μ s), the size of magnetic sensor element 40 on moving direction X is made as T (mm), the scanning times that time per unit ta (μ s) scans magnetic sensor element 40 on described column direction Y is made as N time, and movement speed v, unit interval ta, size T and scanning times N meet following relational expression:
(v×ta)≤(T×N)
In formula, N is more than 2 integer.
In formula, unit interval ta is a scan period for detection of a row magnetic pattern of medium 1.Therefore, in present embodiment, in a scan period, on column direction Y, magnetic sensor element 40 is carried out to N scanning, based on magnetic sensor element 40, by described N the resulting all data of scanning, detect a row magnetic pattern.
More specifically, in the magnetic pattern detecting apparatus 100 of present embodiment, movement speed v, unit interval ta, size T and scanning times N etc. are for example set as following condition:
Movement speed v=0.0016mm/ μ s of medium;
Unit interval ta (scan period)=200 μ s (5kHz);
Size T (thickness the size)=0.3mm of magnetic sensor element 40 on the moving direction X of medium 1;
Scanning times N=4 in unit interval ta (scan period).
Thereby, one scan period medium 1 displacement etc. become following condition:
A scan period medium displacement=0.32mm of 1;
Displacement=the 0.08mm of single pass medium 1;
Scan each time required time=50 μ s (20kHz);
Magnetic sensor element 40 in single pass in time=2.5 of conducting state μ s.
If above-mentioned these conditions, owing to becoming following setting value:
(v×ta)＝0.32mm
(T×N)＝1.2mm
Therefore fully meet following relational expression:
(v×ta)≤(T×N)
In formula, N is more than 2 integer.
Thereby if magnetic sensor element 40 is scanned along column direction Y under these conditions, after single pass finishes, medium 1 moves 0.08mm, but the size of magnetic sensor element 1 on moving direction is 0.3mm.Therefore,, when this scans and scans next time, the Deng Bei view field of magnetic sensor element 40 on medium 1 overlaps on moving direction X.
More specifically, as shown in Figure 14 (c) and Figure 14 (d).In Figure 14 (c) and Figure 14 (d), the region (the Deng Bei view field of the magnetic sensor element 40 that the channel C H1 in conducting state uses on medium 1) that represents magnetic sensor element 40 place under conducting state that channel C H1 uses when scanning for the first time in n scan period with solid line SCH (n, 1).And represent the region at magnetic sensor element 40 place under conducting state that channel C H1 uses when scanning for the second time in this scan period (n scan period) with the single-point SCH (n, 2) that rules.The region that represents magnetic sensor element 40 place under conducting state that channel C H1 uses when scanning for the third time in this scan period (n scan period) with dotted line SCH (n, 3).The region that represents magnetic sensor element 40 place under conducting state that in this scan period (n scan period), channel C H1 uses when scanning for the 4th time with double dot dash line SCH (n, 4).In addition, when each scanning, the region at magnetic sensor element 40 place under conducting state is on same position, to move on column direction Y at medium Width, but easily identify in order to make the position in each region, in Figure 14 (c) and Figure 14 (d), the position in each region is slightly offset on column direction.In Figure 14 (c) and Figure 14 (d), as the region at magnetic sensor element 40 place under conducting state in n+1 scan period, only show the region at magnetic sensor element 40 places that in n+1 scan period, channel C H1 uses when scanning for the first time.
Therefore in present embodiment, owing to meeting above-mentioned relation formula, within a scan period, the region at magnetic sensor element 40 places while scanning for the first time, the region at magnetic sensor element 40 places overlaps on moving direction X when scanning for the second time.Too, the region at magnetic sensor element 40 places during this scanning, the region at magnetic sensor element 40 places on moving direction X overlaps when scanning next time while scanning for the second time and between while scanning for the third time, while scanning for the third time and between during the 4th scanning.Thereby, this when scanning and while next time scanning, the Deng Bei view field of the position of magnetic sensor element 40 in conducting state on medium 1 when this scans, and between the Deng Bei view field of the position of magnetic sensor element 40 in conducting state on medium 1, can not produce gap while once scanning.The magnetic sensor element 40 that other passage is used too.
In addition, by in this scan period (n scan period) for the first time～region SCH1 (n) that the region at the 4th magnetic sensor element 40 place under conducting state of using of when scanning channel C H1 obtains after adding up to, by solid line SCH (n, 1) region shown in, single-point line SCH (n, 2) region shown in, dotted line SCH (n, 3) region shown in, double dot dash line SCH (n, 2) region that the region shown in obtains after adding up to, in region SCH1 (n) and next scan period (n+1 scan period) when scanning for the first time the region (solid line CH1 (n+1 at magnetic sensor element 40 place under conducting state, 1) region shown in) on moving direction, overlap.Thereby, the Deng Bei view field of the position of magnetic sensor element 40 in conducting state on medium 1 while scanning the last time in this scan period, and next scan period in when scanning for the first time, between the Deng Bei view field of the position of magnetic sensor element 40 in conducting state on medium 1, can not produce gap.In addition, the magnetic sensor element 40 that other passage is used too.
Above-mentioned scanning motion is as shown in Figure 13 (b), in a scan period, the scanning that makes the magnetic sensor element 40 of each channel C H1～CH20 become successively conducting state is carried out four times altogether, A/D converter 91 shown in Figure 13 (a) becomes the sequential of conducting state in linkage with above-mentioned action according to each magnetic sensor element 40, the signal that each passage was exported magnetic sensor element 40 with the sampling period (sample frequency=20kHz) of 50 μ s converts digital signal to.
In present embodiment, time shorten to the 2.5 μ s by the magnetic sensor element of each passage 40 in conducting state, thereby be 2MHz by the frequency respective settings of the excitation signal shown in Fig. 3 (b).Therefore, as shown in Figure 15 (a), within time in conducting state (2.5 μ s) once, magnetic sensor element 40 is to the component of signal (sensor output signal) shown in extraction unit 80 output a plurality of (in present embodiment the being three) Fig. 3 (c) shown in Figure 13 (a).; the component of signal that the excitation signal that the frequency that excitation signal has makes to contain a plurality of cycles in signal that in single pass, a plurality of magnetic sensor element 40 are exported separately forms; therefore the detection signal that, in single pass, a plurality of magnetic sensor element 40 are exported separately all comprises respectively a plurality of component of signals.Thereby, even if the time of magnetic sensor element 40 in conducting state shortens, but because the first peak holding circuit 841 in the holding circuit 84 shown in Figure 13 (a) and the second peak holding circuit 842 also can carry out three times, keep, therefore can carry out reliably peak value maintenance.
In addition, in present embodiment, owing to being input in the signal of the A/D converter 91 shown in Figure 13 (a), required frequency band is the frequency band that frequency is lower, therefore, as shown in the solid line in Figure 15 (b), to each channel C, H is set as 20kHz by the sample frequency of A/D converter 91, is set as lower frequency.Therefore, can suitably the signal of magnetic sensor element 40 outputs be converted to digital signal.; for the structure being illustrated with reference to Figure 18; as shown in dotting as a reference example in Figure 15 (b); the sample frequency of A/D converter 91 is set as to 1MHz; even if in time in conducting state once, (par of the signal after keeping in Figure 15 (a)) carries out sampling for four times and carrying out average treatment; but, still there is the problem that its noise reduction is very little in the noise for frequency higher than the high fdrequency component of signal band (5kHz).And in the present embodiment, owing to the sample frequency of A/D converter 91 being set as to 20kHz, therefore, even if carry out in the same manner average treatment four times, also can reduce frequency higher than the noise of the high fdrequency component of 5kHz.
(the main effect of the second embodiment 1)
As mentioned above, in the magnetic pattern detecting apparatus 100 of present embodiment, because the movement speed v (mm/ μ s) of medium 1, size T (mm), the time per unit ta (μ s) of magnetic sensor element 40 on moving direction X are the relational expression below the scanning times N that on column direction Y, magnetic sensor element 40 scanned meets at medium Width:
(v×ta)≤(T×N)
In formula, N is more than 2 integer
Therefore, this in when scanning magnetic sensor element 40 under conducting state residing region, and on while once scanning magnetic sensor element 40 under conducting state, between residing region, can not produce gap.Thereby, even the mode that adopts a plurality of magnetic sensor element 40 to arranging along column direction Y to scan and make medium 1 to move with respect to magnetic sensor 40 also can detect magnetic pattern from all surfaces of medium 1 reliably.
In present embodiment, unit interval ta is for detecting a scan period of a row magnetic pattern of medium 1, based on magnetic sensor element 40, by the resulting data of scanning of carrying out, detects a row magnetic pattern of medium 1 in a described scan period.That is, in order to carry out N scanning (being four scanning in present embodiment) in detecting scan period of a row magnetic pattern.Therefore, owing to detecting a row magnetic pattern based on the resulting a plurality of data of Multiple-Scan, therefore even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element 40, also can relax the impact that above-mentioned noise produces.
In addition, in present embodiment, owing to detecting a row magnetic pattern of medium 1 by N the resulting all data of scanning of carrying out in a scan period based on magnetic sensor element 40, therefore, when this scans and scans next time, the Deng Bei view field of magnetic sensor element 40 on medium 1 can overlap.Thereby, can detect accurately the magnetic characteristic of medium 1.
In addition, in the magnetic pattern detecting apparatus 100 of present embodiment, because being shares magnetic sensor device 20, according to residual magnetic flux density value and magnetic permeability value, the two detects and whether has each magnetic pattern and form position, therefore can generation time between the mensuration of residual magnetic flux density value and the mensuration of magnetic permeability value not poor.Thereby, even while in the situation that magnetic sensor device 20 and medium 1 being moved measure, signal processing part 60 also can carry out high-precision detection with simple structure.Therefore in addition, for conveyer 10, also only at it, on the position by magnetic sensor device 20, require operation stability, can try hard to simplified structure.
And, according to the magnetic pattern detecting apparatus 100 of present embodiment, for utilizing containing the two magnetic ink of hard magnetic material and soft magnetic material, be formed with the medium 1 of magnetic pattern or utilize the medium 1 that is formed with magnetic pattern containing the magnetic ink of material that is positioned at the centre of hard magnetic material and soft magnetic material, also can carry out the detection of magnetic pattern.; for magnetic characteristic, be positioned at the such magnetic pattern in centre of the first magnetic pattern and the second magnetic pattern; as shown in Fig. 6 (d1); because magnetic hysteresis loop is positioned at the centre of the magnetic hysteresis loop of magnetic pattern of the hard magnetic material shown in Fig. 6 (b1) and the magnetic hysteresis loop of the magnetic pattern of the soft magnetic material shown in Fig. 6 (c1); therefore can obtain the signal pattern shown in Fig. 6 (d4); for described magnetic pattern, also can detect it and whether have and form position.
And in the magnetic sensor device 20 of present embodiment, magnetic field applies and is provided as magnetic field with magnet 30 with respect to magnetic sensor element 40 in the both sides of the moving direction of medium 1 and applies with the first magnet 31 and magnetic field and apply with the second magnet 32.Therefore, as shown in Figure 1, utilizing magnetic field to apply with 31 pairs of media 1 that move along the direction shown in arrow X1 of the first magnet magnetizes, afterwards, utilize magnetic sensor element 40, can detect to the medium 1 after magnetization and apply the magnetic flux under the state of bias magnetic field, and utilizing magnetic field to apply with 32 pairs of media 1 that move along the direction shown in arrow X2 of the second magnet magnetizes, afterwards, utilize magnetic sensor element 40, can detect to the medium 1 after magnetization and apply the magnetic flux under the state of bias magnetic field.Thereby, if by the magnetic pattern detecting apparatus of present embodiment 100 for automatic teller machine, can judge the true and false of deposited in medium 1, and also can judge the true and false of the medium 1 that will take out.
[the second embodiment 2]
Figure 16 means the key diagram of magnetic sensor element 40 position at place when each scanning of the magnetic pattern detecting apparatus 100 of second embodiment of the invention 2.In addition, the basic structure of present embodiment and the second embodiment 1 is identical.Therefore, in the following description, common part is added to identical label, and also the description thereof will be omitted.
The magnetic pattern detecting apparatus 100 of present embodiment is also identical with the second embodiment 1, the relational expression below the scanning times N that the movement speed v of medium 1 (mm/ μ s), magnetic sensor element 40 size T (mm), the time per unit ta (μ s) on moving direction X scans magnetic sensor element 40 on column direction Y meets:
(v×ta)≤(T×N)
In formula, N is more than 2 integer.
Therefore, as shown in figure 16, for the first time～the 4th time scanning in carry out continuously twice sweep time, the region at magnetic sensor element 40 place under conducting state overlaps on moving direction.Here, in embodiment 1, based on magnetic sensor element 40, by four resulting all data of scanning of carrying out in a scan period, to detect a row magnetic pattern of medium 1, and in present embodiment, be by the part in N the scanning of carrying out, to scan the row magnetic pattern that resulting data detect medium 1 based on magnetic sensor element 40 in a scan period.
More specifically, in present embodiment, in N the scanning based on magnetic sensor element 40 by carrying out in a scan period, meet following condition more than twice and be less than the resulting a plurality of data of scanning of N time, detect a row magnetic pattern of medium 1, this condition is: when this scans and scans next time, the Deng Bei view field of magnetic sensor element 40 on described medium overlaps on the moving direction X of medium 1.
For example, the region at the region at magnetic sensor element 40 place under conducting state that while scanning for the first time as shown in figure 16,, channel C H1 uses, channel C H1 uses when scanning for the third time magnetic sensor element 40 place under conducting state overlaps on moving direction X.Therefore, in the present embodiment, magnetic sensor element 40 resulting data and magnetic sensor element 40 resulting data when scanning for the third time when scanning are for the first time averaged to processing, and based on this result, detect a row magnetic pattern of medium 1.
Adopt the situation of this structure also identical with embodiment 1, when this scanning (scanning for the first time) and scanning next time (scanning for the third time), because the region at magnetic sensor element 40 place under conducting state overlaps on moving direction X, therefore can detect accurately the magnetic characteristic of medium 1.In addition, due to can be based on detecting a row magnetic pattern by the resulting data of twice sweep, therefore even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element 40, also can relax the impact that above-mentioned noise produces.
In addition, also can be according to the movement speed v of medium 1, the size T of magnetic sensor element 40 on moving direction X, the scanning times N that time per unit ta (μ s) scans magnetic sensor element 40 on column direction Y etc., in N the scanning based on magnetic sensor element 40 by carrying out in a scan period, meet following condition more than twice and be less than the resulting a plurality of data of scanning of N time, detect a row magnetic pattern of medium 1, this condition is: when this scans and scans next time, the Deng Bei view field of magnetic sensor element 40 on medium 1 do not overlap but is continuous on the moving direction X of medium 1.
[the second embodiment 3]
The key diagram of the magnetic sensor element 40 of magnetic pattern detecting apparatus 100 that Figure 17 means second embodiment of the invention 3 position at place and position of sensor sensing range thereof when each scanning.In addition, the basic structure of present embodiment and the second embodiment 1 is identical.Therefore, in the following description, common part is added to identical label, and also the description thereof will be omitted.
The magnetic pattern detecting apparatus 100 of present embodiment is also identical with the second embodiment 1, the relational expression below the scanning times N that the movement speed v of medium 1 (mm/ μ s), magnetic sensor element 40 size T (mm), the time per unit ta (μ s) on moving direction X scans magnetic sensor element 40 on column direction Y meets:
(v×ta)≤(T×N)
In formula, N is more than 2 integer.
Therefore, as shown in figure 17, for the first time～the 4th time scanning in carry out continuously twice sweep time, the region at magnetic sensor element 40 place under conducting state overlaps on moving direction.Here, in embodiment 1, based on magnetic sensor element 40, by four resulting all data of scanning of carrying out in a scan period, to detect a row magnetic pattern of medium 1, and in present embodiment, be by the part in N the scanning of carrying out, to scan the row magnetic pattern that resulting data detect medium 1 based on magnetic sensor element 40 in a scan period.
More specifically, as shown in figure 17, the actual sensor sensing range of magnetic sensor element 40 is greater than the Deng Bei view field of this magnetic sensor element 40 on medium 1, and the big or small S (mm) of the sensor sensing range of magnetic sensor element 40 on the moving direction X of medium 1 is greater than the size T of magnetic sensor element 40 on moving direction X.Therefore, in present embodiment, be based on magnetic sensor element, in the scanning of N time by carrying out in a scan period, meet following condition more than twice and be less than the resulting a plurality of data of scanning of N time, detect a row magnetic pattern of medium 1, this condition is: when this scans and scans next time, sensor sensing range overlaps on the moving direction X of medium 1.
For example, the sensor sensing range of the magnetic sensor element 40 that while scanning for the first time as shown in figure 17,, channel C H1 uses under conducting state, channel C H1 uses when scanning for the third time the magnetic sensor element 40 sensor sensing range under conducting state overlaps.Therefore, in the present embodiment, magnetic sensor element 40 resulting data and magnetic sensor element 40 resulting data when scanning for the third time when scanning are for the first time averaged to processing, and based on this result, detect a row magnetic pattern of medium 1.
Adopt the situation of this structure also identical with the second embodiment 1, when this scanning (scanning for the first time) and scanning next time (scanning for the third time), because the sensor sensing range of magnetic sensor element 40 overlaps on moving direction X, therefore can detect accurately the magnetic characteristic of medium 1.In addition, due to can be based on detecting a row magnetic pattern by the resulting data of twice sweep, therefore even the in the situation that of containing noise etc. affect in resulting any data of magnetic sensor element 40, also can relax the impact that above-mentioned noise produces.
In addition, also can be according to the movement speed v of medium 1, the size T of magnetic sensor element 40 on moving direction X, the scanning times N that time per unit ta (μ s) scans magnetic sensor element 40 on column direction Y etc., in N the scanning based on magnetic sensor element 40 by carrying out in a scan period, meet following condition more than twice and be less than the resulting a plurality of data of scanning of N time, detect a row magnetic pattern of medium 1, this condition is: when this scans and scans next time, sensor sensing range does not overlap but is continuous on the moving direction X of medium 1.
(other embodiment of the second embodiment)
In above-mentioned embodiment, when medium 1 and magnetic sensor device 20 are relatively moved, be that medium 1 is moved, but also can adopt the fixing and structure that magnetic sensor device 20 moves of medium 1.In addition, in above-mentioned embodiment, used permanent magnet to apply with magnet 30 as magnetic field, but also can use electromagnet.
In above-mentioned embodiment, illustrated that based on magnetic sensor element 40 four times in the scanning of N time by carrying out or the resulting data of twice sweep detect the example of a row magnetic pattern of medium 1 in a scan period, but also can be based on magnetic sensor element 40 by the row magnetic pattern that resulting data detect medium 1 that scans for once or three times in N the scanning of carrying out in a scan period, so long as scan by the one or many in N the scanning of carrying out the row magnetic pattern that resulting data detect medium 1 based on magnetic sensor element 40 in a scan period.More specifically, in a scan period, carry out N scanning, during each scanning, by magnetic sensor element 40, obtain data, but while determining a row magnetic pattern of medium 1, use magnetic sensor element 40 by single pass or the resulting data of Multiple-Scan in N the scanning of carrying out in a scan period.
In addition, in above-mentioned embodiment, illustrated based on magnetic sensor element 40 by meet the resulting data of Multiple-Scan of following condition in N the scanning of carrying out in a scan period, detect the example of a row magnetic pattern of medium 1, this condition is: when this scans and scans next time, the sensor sensing range of magnetic sensor element 40 is mutually continuous, but also can be based on magnetic sensor element 40 by meet the resulting data of Multiple-Scan of following condition in N the scanning of carrying out in a scan period, detect a row magnetic pattern of medium 1, this condition is: when this scans and scans next time, discontinuous and the devices spaced apart of the sensor sensing range of magnetic sensor element 40.Can also based on by this scanning and on while once scanning magnetic sensor element 40 the resulting data of the consecutive scanning of sensor sensing range and by this scanning and on the resulting data of sensor sensing range scanning discontinuous and devices spaced apart of magnetic sensor element 40 while once scanning, detect a row magnetic pattern of medium 1.
In addition, during which single pass in N the scanning based on magnetic sensor element 40 by carrying out in a scan period, resulting data detect a row magnetic pattern of medium 1, this can be also variable, can send to the instruction of digital signal processing portion 90 and at random set according to the control part from upper or outside.If adopt this structure, can realize best action according to the kind of medium 1 and magnetic pattern detecting apparatus 100 desired accuracy of detection etc.

Claims (2)

1. a magnetic pattern detecting apparatus, comprises for detecting the magnetic sensor element of magnetic characteristic of medium and the signal processing part that the testing result based on this magnetic sensor element detects the magnetic pattern of described medium, it is characterized in that,
Described signal processing part comprises first integral circuit and second integral circuit, wherein, described first integral circuit is that positive component of signal is carried out integration to described sensor output Semi-polarity, and described second integral circuit is that negative component of signal is carried out integration to described sensor output Semi-polarity.
2. magnetic pattern detecting apparatus as claimed in claim 1, is characterized in that,
Described magnetic sensor element has a plurality of coils for exporting described sensor output signal as differential output.
CN201410310405.5A 2010-02-05 2011-01-13 Magnetic pattern detecting apparatus Expired - Fee Related CN104063938B (en)

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