CN102369558B - Magnetic pattern detection device - Google Patents

Magnetic pattern detection device Download PDF

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Publication number
CN102369558B
CN102369558B CN201180001718.7A CN201180001718A CN102369558B CN 102369558 B CN102369558 B CN 102369558B CN 201180001718 A CN201180001718 A CN 201180001718A CN 102369558 B CN102369558 B CN 102369558B
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China
Prior art keywords
magnetic
signal
sensor element
magnetic sensor
medium
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CN201180001718.7A
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Chinese (zh)
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CN102369558A (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
Priority to CN201410310573.4A priority Critical patent/CN104123781B/en
Priority to CN201410310405.5A priority patent/CN104063938B/en
Publication of CN102369558A publication Critical patent/CN102369558A/en
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Publication of CN102369558B publication Critical patent/CN102369558B/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 the magnetic pattern detection device (100), when an amplification unit (70) of a signal processing unit (60) inputs a sensor output signal and a reference voltage 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 diffrent from the sensor output signal output from the magnetic sensor element, the amplifier gain can be increased.

Description

Magnetic pattern detecting apparatus
Technical field
The magnetic pattern detecting apparatus that the magnetic pattern that the present invention relates to the media such as a kind of object to being provided with magnetic, the bank note that prints with magnetic ink detects.
Background technology
From objects such as the cards being provided with magnetic, to carry out the media such as the bank note that prints with magnetic ink and detect in the magnetic pattern detecting apparatus of magnetic pattern, utilize magnetic sensor element to detect the flux change of medium by producing during this magnetic pattern detecting apparatus, and utilize signal processing part to carry out signal transacting to the sensor output signal that magnetic sensor element exports.Here, in signal processing part, enlarging section is formed with amplifier, to the reference voltage that this amplifier input pickup outputs signal and formed by fixed voltage, after having carried out sensor output signal utilizing enlarging section amplifying, carry out various signal transacting (with reference to patent documentation 1 ~ 3).
And, in this magnetic pattern detecting apparatus, utilize magnetic sensor element to detect the flux change of medium by producing during this magnetic pattern detecting apparatus, and detect magnetic pattern according to the signal that magnetic sensor element exports.Here, magnetic sensor element is as shown in Figure 18 (a), 18 (b), on the column direction Y (media width direction) that the moving direction X (line direction) with medium 1 is orthogonal, such as be arranged with 20 magnetic sensor element and be respectively used to channel C H1 ~ CH20, by scanning these 20 magnetic sensor element 40 on column direction Y, to detect the magnetic pattern of medium 1 on whole Width.
Namely, if carry out single pass to the multiple magnetic sensor element 40 shown in Figure 18 (a), 18 (b), then because 20 magnetic sensor element 40 of channel C H1 ~ CH20 can detect data, therefore, as shown in Figure 18 (d), if convert the detection data of magnetic sensor element 40 to digital signal with A/D converter with being in the timing synchronization of conducting state with magnetic sensor element 40, then 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 that X moves in the row direction.Therefore, if represent by hatched example areas the region that magnetic sensor element 40 is residing in the on-state, then as shown in Figure 18 (c), in medium 1, the region (having marked the region to top-right oblique line) that during present scan, magnetic sensor element 40 is residing in the on-state and magnetic sensor element 40 when next time scanning in the on-state residing for region (having marked the region of oblique line to the right) adjacent in the side contrary with moving direction X.Thus, the magnetic pattern on whole medium 1 can be detected.
Patent documentation 1: Japanese Patent Laid-Open 2007-241653 publication
Patent documentation 2: Japanese Patent Laid-Open 2007-241654 publication
Patent documentation 3: Japanese Patent Laid-Open 2009-163336 publication
Summary of the invention
But in the structure described in patent documentation 1 ~ 3, when amplifying sensor output signal, owing to employing the reference voltage of fixed voltage as amplifier, therefore the difference of sensor output signal and reference voltage is larger.For these reasons, the signal exported to make amplifier is unlikely to saturated, needs the gain of amplifier to suppress lower, therefore there is the problem that cannot improve and detect gain.On the other hand, if use bridge circuit to carry out differential amplify to the output signal of magnetic sensor element, then existence can cause the problem that cost significantly rises.
And, the multiple magnetic sensor element 40 arranged along column direction Y are being scanned and is making in the magnetic pattern detecting apparatus of this mode of medium 1 movement, can 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 the region (having marked the region to top-right oblique line) that when causing present scan, magnetic sensor element 40 is residing in the on-state and magnetic sensor element 40 when next time scanning in the on-state residing for region (having marked the region of oblique line to the right) between produce clearance G, as shown in Figure 18 (c).Such as, 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 when 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 in the direction of movement, then can produce the clearance G of 0.02mm between the region that during present scan, magnetic sensor element 40 is residing in the on-state and the region that when scanning, magnetic sensor element 40 is residing in the on-state next time.Therefore, for the region being equivalent to clearance G in medium 1, just can not detect its magnetic characteristic by magnetic sensor element 40, thus be difficult to detect magnetic pattern from all surfaces of medium 1 accurately.
On the other hand, the sensor sensing range had due to magnetic sensor element 40 is usually more than the equimultiple projected area of magnetic sensor element 40 on medium 1, 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 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 the sensor sensing range when present scan and on produce clearance G between sensor sensing range when 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 not raises 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 employing and scans the multiple magnetic sensor element arranged along column direction and make medium relative to the mode of magnetic sensor movement, the magnetic pattern detecting apparatus of magnetic pattern also reliably can be detected from all surfaces of medium.
In order to solve above-mentioned first technical matters, magnetic pattern detecting apparatus of the present invention comprises the magnetic sensor element of the magnetic characteristic for detecting medium, the signal processing part of the magnetic pattern of described medium is detected with the testing result based on this magnetic sensor element, it is characterized in that, described signal processing part has enlarging section, this enlarging section is amplified the sensor output signal that the described magnetic sensor element of having carried out excitation by excitation signal exports, described enlarging section comprises amplifier and reference voltage generating unit, wherein, described sensor output signal and reference voltage is inputted to described amplifier, the signal that described reference voltage generating unit generates and described excitation signal changes in linkage is as described reference voltage.
In the present invention, when amplifying sensor output signal with amplifier, owing to using the reference voltage changed in linkage with excitation signal, the sensor output signal therefore exported from magnetic sensor element and the difference of reference voltage less.Thus, even if do not add the circuit that bridge circuit etc. can cause cost to increase, also can improve the gain of amplifier, and S/N ratio can be improved.And, because reference voltage changes in linkage with excitation signal, and be synchronous with sensor output signal, therefore, it is possible to suitably amplify sensor output signal.
In the present invention, described reference voltage preferably have differential has been carried out to described excitation signal after the signal of waveform that obtains.Because sensor output signal is equivalent to the time diffusion to the magnetic flux that excitation signal produces, if therefore use the reference voltage of signal as amplifier of the waveform obtained after having carried out differential to excitation signal, difference then due to sensor output signal and reference voltage is less, thus can improve gain.
In the present invention, described reference voltage generating unit preferably has carries out differential to described excitation signal thus the CR differentiating circuit generating described reference voltage.By adopting this structure, using the electronic component that such as electric capacity, resistance and so on are inexpensive, with regard to forming, differential being carried out thus the differentiating circuit of generation reference voltage to excitation signal.
In the present invention, described reference voltage generating unit also can have illusory magnetic sensor element, and this illusory magnetic sensor element carries out excitation by described excitation signal, and the signal that output obtains after carrying out differential to this excitation signal is as described reference voltage.The output signal of illusory magnetic sensor element is equivalent to the time diffusion to the magnetic flux that excitation signal produces, thus can generate differential has been carried out to excitation signal after the signal of waveform that obtains as reference voltage.According to said reference voltage, then the difference due to this reference voltage and sensor output signal is minimum, therefore, it is possible to 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 carries out integration to the signal Semi-polarity that described amplifier exports, and described second integral circuit is that negative component of signal carries out integration to the signal Semi-polarity that described amplifier exports.According to this structure, even if then very narrow from the pulsewidth of the signal of amplifier output, but be that negative component of signal carries out integration respectively owing to can be also positive component of signal and polarity to polarity, thus amplitude variations is converted to area change, therefore just can improve apparent gain by simple structure.
The magnetic pattern detecting apparatus of another embodiment of the present invention comprises the magnetic sensor element of the magnetic characteristic for detecting medium and detects the signal processing part of magnetic pattern of described medium based on the testing result of this magnetic sensor element, it is characterized in that, described signal processing part comprises first integral circuit and second integral circuit, wherein, it is that positive component of signal carries out integration that described first integral circuit exports Semi-polarity to described sensor, and it is that negative component of signal carries out integration that described second integral circuit exports Semi-polarity to described sensor.
In the present invention, even if the pulsewidth of sensor output signal is very narrow, but be that negative component of signal carries out integration respectively owing to can be also positive component of signal and polarity to polarity, thus amplitude variations is converted to area change, therefore just can improve apparent gain by simple structure.
In the present invention, described magnetic sensor element preferably has the multiple coils for being exported as differential output by described sensor output signal.According to this structure, be not then 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 detecting magnetic characteristic from medium, the connecting gear of movement is carried out relative to this magnetic sensor element with making described medium, it is characterized in that, described magnetic sensor element arranges multiple on the column direction orthogonal with the moving direction of described medium, the translational speed of the described medium being undertaken transmitting by described connecting gear is set to v (mm/ μ s), the size of described magnetic sensor element on described moving direction is set to T (mm), time per unit ta (μ s) is set to N time the scanning times that described magnetic sensor element scans in the column direction, then described movement speed v, described unit interval ta, described size T and described scanning times N meets following relational expression:
(v×ta)≤(T×N)
In formula, N is the integer of more than 2.
In the present invention, the scanning times N scanned magnetic sensor element in a column direction due to the movement speed v of medium, magnetic sensor element size T in the direction of movement, time per unit ta is set to meet above-mentioned relation formula, therefore, gap can not be produced between the region that during present scan, magnetic sensor element is residing in the on-state and the region that when scanning, magnetic sensor element is residing in the on-state next time.Thus, even employing scans the multiple magnetic sensor element arranged along column direction and makes medium relative to the mode of magnetic sensor movement, also reliably magnetic pattern can be detected from all surfaces of medium.
In the present invention, following structure can be adopted: described unit interval ta is used to detect a scan period of a row magnetic pattern of described medium, based on the data that described magnetic sensor element is obtained by the scanning carried out in a described scan period, detect a row magnetic pattern of described medium.That is, in a scan period in order to detect a row magnetic pattern, Multiple-Scan is carried out.Therefore, the structure of the Data Detection one row magnetic pattern obtained based on Multiple-Scan can be adopted, according to this structure, even when then affecting containing noise etc. in any one data that magnetic sensor element obtains, the impact that above-mentioned noise produces also can be relaxed.
In the present invention, following structure can be adopted: the data that the single pass in being scanned by carry out in a described scan period N time based on described magnetic sensor element or Multiple-Scan are obtained, detect a row magnetic pattern of described medium.According to this structure, then can accuracy of detection required by the kind of medium and magnetic pattern detecting apparatus etc. and realize best action.
In the present invention, preferably pass through the data that the Multiple-Scan in N the scanning carried out in a described scan period obtains based on described magnetic sensor element, detect a row magnetic pattern of described medium.According to this structure, then can detect the magnetic characteristic of medium accurately.And, even when affecting containing noise etc. in any one data that magnetic sensor element obtains, the impact of above-mentioned noise also can be relaxed.
In the present invention, following structure can be adopted: scan by N time of carrying out in a described scan period all data obtained based on described magnetic sensor element, detect a row magnetic pattern of described medium.According to this structure, then due to present scan with when scanning next time, the equimultiple view field of magnetic sensor element on medium overlaps, therefore, it is possible to detect the magnetic characteristic of medium accurately.And, even when affecting containing noise etc. in any one data that magnetic sensor element obtains, the impact of above-mentioned noise also can be relaxed.
In the present invention, the part also can passed through in N the scanning carried out in a scan period based on magnetic sensor element scans the data obtained, and detects a row magnetic pattern of medium.
Such as, also following structure can be adopted: meet in being scanned by carry out in a described scan period N time based on described magnetic sensor element and multiple data of obtaining of the scanning being less than N time more than twice of following condition, detect a row magnetic pattern of described medium, this condition is: present scan and when next time scanning, and described magnetic sensor element equimultiple view field on media described overlaps on described moving direction; Or present scan and when scanning, described magnetic sensor element equimultiple view field does not on media described overlap but continuously on described moving direction next time.
In this case, meet in preferably being scanned by carry out in a described scan period N time based on described magnetic sensor element and multiple data of obtaining of the scanning being less than N time more than twice of following condition, detect a row magnetic pattern of described medium, this condition is: present scan and when next time scanning, and described magnetic sensor element equimultiple view field on media described overlaps on described moving direction.According to this structure, then due to present scan with when scanning next time, the equimultiple view field of magnetic sensor element on medium overlaps, therefore, it is possible to detect the magnetic characteristic of medium accurately.And, even when affecting containing noise etc. in any one data that magnetic sensor element obtains, the impact of above-mentioned noise also can be relaxed.
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 following structure can be adopted: meet in being scanned by carry out in a described scan period N time based on described magnetic sensor element and multiple data of obtaining of the scanning being less than N time more than twice of following condition, detect a row magnetic pattern of described medium, this condition is: present scan and when next time scanning, described sensor sensing range overlaps on described moving direction, or present scan and when scanning, described sensor sensing range does not overlap but continuously on described moving direction next time.
In this case, meet in preferably being scanned by carry out in a described scan period N time based on described magnetic sensor element and multiple data of obtaining of the scanning being less than N time more than twice of following condition, detect a row magnetic pattern of described medium, this condition is: present scan and when next time scanning, and described sensor sensing range overlaps on described moving direction.According to this structure, then due to present scan with when scanning next time, sensor sensing range overlaps, therefore, it is possible to detect the magnetic characteristic of medium accurately.And, even when affecting containing noise etc. in any one data that magnetic sensor element obtains, the impact of above-mentioned noise also can be relaxed.
In the present invention, preferably when the multiple data obtained in a described scan period based on described magnetic sensor element detect a row magnetic pattern of described medium, process is averaged to described multiple data.According to this structure, even then when going out a row magnetic pattern of medium according to multiple Data Detection, as long as also simply process.And, if average process to multiple data, even when then affecting containing noise etc. in any one data that magnetic sensor element obtains, the impact of above-mentioned noise also can be relaxed.
In the present invention, the row magnetic pattern detecting described medium by the data obtained during which single pass in carry out in a described scan period N time scanning based on described magnetic sensor element is preferably variable.According to this structure, then can accuracy of detection required by the kind of medium and magnetic pattern detecting apparatus etc. and realize best action.
In the present invention, when described magnetic sensor element is carried out excitation by excitation signal and outputed signal, the frequency that described excitation signal has preferably makes the signal that described in single pass, multiple magnetic sensor element exports separately comprise the component of signal be made up of the described excitation signal in multiple cycle.According to this structure, then the signal exported separately due to magnetic sensor element multiple in single pass comprises the component of signal be made up of the excitation signal in multiple cycle all respectively, therefore, it is possible to detect the magnetic characteristic of medium accurately.
In the magnetic pattern detecting apparatus of Section 1 invention, when amplifying sensor output signal with amplifier, owing to using the reference voltage changed in linkage with excitation signal, the signal therefore exported from magnetic sensor and the difference of reference voltage less.Thus, even if do not add the circuit that bridge circuit etc. can cause cost to increase, also can improve the gain of amplifier, and S/N ratio can be improved.And, because reference voltage changes in linkage with excitation signal, so sensor output signal and reference voltage are synchronous, therefore, it is possible to suitably amplify sensor output signal.
In addition, in the magnetic pattern detecting apparatus of another embodiment of Section 1 invention, because signal processing part comprises first integral circuit and second integral circuit, wherein, it is that positive component of signal carries out integration that first integral circuit exports Semi-polarity to sensor, it is that negative component of signal carries out integration that second integral circuit exports Semi-polarity to sensor, therefore, even when the pulsewidth of sensor output signal is narrower, also can be positive component of signal and polarity to polarity be that negative component of signal carries out integration respectively, thus amplitude variations is converted to area change.Thus, just apparent gain can be improved by simple structure.
And in the magnetic pattern detecting apparatus of Section 2 invention, the scanning times N scanned magnetic sensor element in a column direction due to the movement speed v of medium, magnetic sensor element size in the direction of movement, time per unit ta is set to meet following relational expression:
(v×ta)≤(T×N)
In formula, N is the integer of more than 2,
Therefore, gap can not be produced between the region that during present scan, magnetic sensor element is residing in the on-state and the region that when scanning, magnetic sensor element is residing in the on-state next time.Thus, even employing scans the multiple magnetic sensor element arranged along column direction and makes medium relative to the mode of magnetic sensor movement, also reliably magnetic pattern can be detected from all surfaces of medium.
Accompanying drawing explanation
Fig. 1 is the key diagram with the structure of the magnetic pattern detecting apparatus of magnetic sensor device representing 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 is the block scheme of the electric structure of the magnetic pattern detecting apparatus representing first embodiment of the invention 1.
Fig. 5 is the key diagram of the signal being input to amplifier in the enlarging section of the magnetic pattern detecting apparatus of first embodiment of the invention 1 etc.
Fig. 6 is the key diagram to the characteristic of the various magnetic inks that medium is formed etc. in the magnetic pattern detecting apparatus representing first embodiment of the invention 1.
Fig. 7 detects the key diagram that whether there is the principle of magnetic pattern in the magnetic pattern detecting apparatus representing first embodiment of the invention 1 from the medium being formed with different types of magnetic pattern.
Fig. 8 is the key diagram of the enlarging section peripheral structure in the circuit part of the magnetic pattern detecting apparatus representing first embodiment of the invention 2.
Fig. 9 is the key diagram of the enlarging section structure of the magnetic pattern detecting apparatus representing first embodiment of the invention 3.
Figure 10 is the key diagram of the enlarging section peripheral structure of the magnetic pattern detecting apparatus representing first embodiment of the invention 4.
Figure 11 is the key diagram of the skew adjustment part peripheral structure of the magnetic pattern detecting apparatus representing 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 is the key diagram of the electric structure of the magnetic pattern detecting apparatus representing second embodiment of the invention 1.
Figure 14 is the key diagram of the scanning motion of the magnetic pattern detecting apparatus representing second embodiment of the invention 1 etc.
Figure 15 is the key diagram of the operation condition of the circuit part of the magnetic pattern detecting apparatus representing second embodiment of the invention 1.
Figure 16 is the key diagram of magnetic sensor element position at place when each scanning of the magnetic pattern detecting apparatus representing second embodiment of the invention 2.
Figure 17 is the magnetic sensor element position at place and key diagram of sensor sensing range thereof when each scanning of the magnetic pattern detecting apparatus representing 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.First embodiment invents to Section 1 the embodiment be described.
[the first embodiment 1]
(one-piece construction)
Fig. 1 is the key diagram with the structure of the magnetic pattern detecting apparatus of magnetic sensor device representing first embodiment of the invention 1, Fig. 1 (a) is the key diagram of the primary structure schematically representing magnetic pattern detecting apparatus, and Fig. 1 (b) is the key diagram schematically representing cross section structure.
Magnetic pattern detecting apparatus 100 shown in Fig. 1 from the medium such as bank money, securities 1, detects magnetic to distinguish the true from the false and the device of kind, has and utilize roller, guiding piece (not shown) etc. to make the medium 1 of sheet carry out the conveyer 10 of movement along medium mobile route 11 and in the half-way of being carried out the medium mobile route 11 transmitted by this conveyer 10, detect the magnetic sensor device 20 of magnetic from medium 1.In present embodiment, roller, guiding piece are made up of nonmagnetic substances such as 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, the magnetic pattern that existence magnetic ink is formed in the magnetic regions 1a that the width extended along the moving direction X of medium 1 is narrower, described magnetic pattern is formed by the multiple magnetic ink that residual magnetic flux density Br and magnetic permeability μ is different.Such as, in medium 1, be formed with the first magnetic pattern utilizing the magnetic ink printing containing hard magnetic material and the second magnetic pattern utilizing the magnetic ink printing containing soft magnetic material.Therefore, the magnetic pattern detecting apparatus 100 of present embodiment detects in medium 1 whether there is each magnetic pattern according to both residual magnetic flux density value and magnetic permeability value.In addition, in present embodiment, be shared for the magnetic sensor device 20 detected described two kinds of magnetic patterns.Thus, 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) is the key diagram of the layout of the magnetic sensor element represented in magnetic sensor device 20 etc., Fig. 2 (b) be represent 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: to medium 1 apply magnetic field magnetic field applying magnet 30, detect to the magnetic flux be applied with under state that the medium behind magnetic field 1 applies bias magnetic field magnetic sensor element 40 and cover the non-magnetic shell 25 of magnetic field applying magnet 30 and magnetic sensor element 40.Magnetic sensor device 20 comprises: the inclined plane part 22,23 forming roughly conplane sensor cover 21 with medium mobile route 11 and be connected with this sensor cover 21 in the both sides of the moving direction of medium 1 relative to sensor cover 21, its shape is by the shape defined of shell 25.
Magnetic sensor device 20 extends on the direction that the moving direction X with medium 1 intersects, and magnetic field applying magnet 30 and magnetic sensor element 40 are arranged with multiple on the direction that the moving direction X with medium 1 intersects.In present embodiment, with the moving direction X orthogonal media width direction Y of magnetic sensor device 20 in the direction intersected with the moving direction X of medium 1 extends, magnetic field applying magnet 30 and magnetic sensor element 40 are arranged with multiple on media width direction Y (column direction) orthogonal with moving direction X, and equally spaced arrange in a column.Therefore, if scan the multiple magnetic sensor element 40 arranged along media width direction Y, make it become conducting state successively, then can detect the magnetic pattern of medium 1 on the Y of media width direction.In addition, if make medium 1 move on moving direction X concurrently with above-mentioned scanning, then whole magnetic patterns of medium 1 can be detected.In addition, " conducting state " mentioned here, refers to and applies hereinafter described excitation signal to magnetic sensor element 40 and the state of activation of the signal that magnetic sensor element 40 exports being carried out to signal transacting.
In present embodiment, magnetic field applying magnet 30 is arranged on the both sides of the moving direction X of medium 1 relative to magnetic sensor element 40, apply to apply with the second magnet 32 with the first magnet 31 and magnetic field as magnetic field, along the moving direction of the medium 1 shown in arrow X1, be disposed with magnetic field and apply to apply with the second magnet 32 with the first magnet 31, magnetic sensor element 40 and magnetic field.And along the moving direction of the medium 1 shown in arrow X2, be disposed with magnetic field to apply to apply with the first magnet 31 with the second magnet 32, magnetic sensor element 40 and magnetic field, no matter medium 1 moves along the direction shown in arrow X1 or moves along the direction shown in arrow X2, can detect the magnetic characteristic of medium 1.Here, magnetic sensor element 40 be arranged on magnetic field apply to apply with the second magnet 32 with the first magnet 31 and magnetic field between centre position on, magnetic field applying equals magnetic field with the standoff distance between the first magnet 31 and magnetic sensor element 40 and applies 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 applying 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 applying magnet 30 (magnetic field applies to apply with the second magnet 32 with the first magnet 31 and magnetic field) possesses the permanent magnet 35 such as ferrite, neodymium magnet.No matter be that magnetic field applies to apply with the second magnet 32 with the first magnet 31 or magnetic field, the side being positioned at sensor cover 21 and the side contrary from sensor cover 21 side of permanent magnet 35 are all magnetized to different magnetic poles.Therefore, the effect as carrying out magnetized magnetizing surface 350 to medium 1 is played on the surface being positioned at sensor cover 21 side of permanent magnet 35.Namely, in the magnetic pattern detecting apparatus 100 of present embodiment, as described later, when the medium 1 of movement as shown in arrow X1 is by magnetic sensor device 20, first, apply from magnetic field to apply magnetic field with the first magnet 31 to medium 1, by the medium 1 after described magnetic field magnetisation again by magnetic sensor element 40.And the medium 1 of movement when as arrow X2 Suo Shi by magnetic sensor device 20 time, first, apply from magnetic field to apply magnetic field with the second magnet 32 to medium 1, passed through magnetic sensor element 40 again by the medium 1 after described magnetic field magnetisation.
The multiple permanent magnets 35 used in magnetic field applying magnet 30 all have same size and same shape, but are arranged respectively to following direction of magnetization.First, no matter be that magnetic field applies to apply with the second magnet 32 with the first magnet 31 or magnetic field, all magnetize towards opposite directions at the upper adjacent permanent magnet 35 of media width direction (column direction) Y orthogonal with the moving direction X of medium 1.Namely, in multiple permanent magnets 35 that the media width direction Y orthogonal with the moving direction X of medium 1 arranges, the end being positioned at medium mobile route 11 side of one of them permanent magnet 35 is magnetized into N pole, the end being positioned at the side contrary with medium mobile route 11 side is magnetized into S pole, and permanent magnet 35 adjacent with this permanent magnet 35 on the media width direction Y orthogonal with the moving direction X of medium 1, its end being positioned at medium mobile route 11 side is magnetized into S pole, and the end being positioned at the side contrary with medium mobile route 11 side is magnetized into N pole.In addition, in present embodiment, magnetic field in opposite directions on the moving direction of medium 1 is applied to the permanent magnet 35 of permanent magnet 35 with the first magnet 31 and magnetic field applying the second magnet 32, clip magnetic sensor element 40 and in opposite directions with different magnetic poles.In addition, magnetic field in opposite directions on the moving direction of medium 1 is applied to the permanent magnet 35 of permanent magnet 35 with the first magnet 31 and magnetic field applying 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 of the excitation waveform to this magnetic sensor element 40, and Fig. 3 (c) is the key diagram of the output signal from magnetic sensor element 40.In Fig. 3 (a), represent that medium 1 carries out the state of movement on 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 of thickness direction T40 towards medium 1, Width W40 towards media width direction (column direction) Y orthogonal with the moving direction X of medium 1.
The two sides of magnetic sensor element 40 by the thickness that formed by pottery etc. about 0.3mm ~ 1.0mm laminal non-magnetic member 47 cover, the thickness direction of the whole magnetic sensor element 40 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, and magnetic sensor element 40 is in the state exposed 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, the outstanding poly-magnetic teat 43 of the main part 42 that the Width W40 that sensor magnetic core 41 is included in magnetic sensor element 40 extends and medium mobile route 11 side from main part 42 to medium 1.Here, poly-magnetic teat 43 is formed as the both ends of the Width W40 from main part 42 two the poly-magnetic teats 431,432 outstanding to medium mobile route 11 side of medium 1, and two poly-magnetic teats 431,432 are spaced apart on Width W40.In addition, sensor magnetic core 41 has from main part 42 teat 44 outstanding to the side contrary with poly-magnetic teat 43, in present embodiment, teat 44 is formed as outstanding two teats 441,442 in the side that the both ends of the Width W40 from main part 42 are contrary to medium mobile route 11 side with medium 1.
For adopting the sensor magnetic core 41 of this structure, field coil 48 is wound on main part 42 by part that poly-magnetic teat 431,432 clips.In addition, magnetic test coil 49 is wound in poly-magnetic teat 43, in present embodiment, magnetic test coil 49 comprises the magnetic test coil 491 of the poly-magnetic teat 431 in two the poly-magnetic teats 43 (poly-magnetic teat 431,432) being wound in sensor magnetic core 41 and is wound in the magnetic test coil 492 of poly-magnetic teat 432.Here, two magnetic test coils 491,492 are oppositely wound in poly-magnetic teat 431,432 each other.In addition, form because single line astragal is wound in poly-magnetic teat 431,432 by two magnetic test coils 491,492 continuously, therefore two magnetic test coils 491,492 are in series electrically connected.In addition, also can, after two magnetic test coils 491,492 are wound in poly-magnetic teat 431,432 respectively, realize in series being electrically connected.
The magnetic sensor element 40 of this structure is adopted to be arranged to and the moving direction X of both all orthogonal thickness direction T40 of the projected direction (short transverse V40) of Width W40 and poly-magnetic teat 43 towards medium 1, in magnetic sensor element 40, poly-magnetic teat 43 (poly-magnetic teat 431,432) and magnetic test coil 49 (magnetic test coil 491,492) Width W40 spaced apart are towards media width direction (column direction) Y orthogonal with the moving direction X of medium 1.
In magnetic sensor element 40, the excitation signal formed by exchange current (with reference to Fig. 3 (b)) from the field circuit 50 be described with reference to Fig. 4 is hereinafter applied to field coil 48.Therefore, as shown in Fig. 3 (a), formation bias magnetic field around sensor magnetic core 41, and from the signal of the detection waveform shown in magnetic test coil 49 output map 3 (c).Here, the detection waveform shown in Fig. 3 (c) is the time diffusion signal to the magnetic flux that excitation signal produces, 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 the structure clipping magnetic material layer 41c between nonmagnetic first substrate 41a and nonmagnetic second substrate 41b.In present embodiment, magnetic material layer 41c is made up 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 utilizes adhesive linkage and engages, to be clipped in the middle by magnetic material layer 41c with a surface of described first substrate 41a.Described adhesive linkage be all by resin material impregnate in the fibre reinforced materials such as glass fibre, carbon fiber, aramid fibre and the layer formed prepreg being cured and being formed, 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 uses is formed by being rolled with roller, as cobalt class, the non-crystaline amorphous metals such as Co-Fe-Ni-Mo-B-Si, Co-Fe-Ni-B-Si can be enumerated, as iron class, 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 can be enumerated.First substrate 41a and second substrate 41b can enumerate ceramic substrate, the glass substrates etc. such as aluminum oxide substrate, as long as can obtain enough rigidity, also can use plastic base.
(structure of signal processing part 60)
Fig. 4 is the block scheme of the electric structure of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 1, Fig. 4 (a) is the integrally-built key diagram of major part in indication circuit portion, and Fig. 4 (b) is the key diagram of the enlarging section peripheral structure in indication circuit portion.
In present embodiment, the circuit part 5 shown in Fig. 4 (a) He Fig. 4 (b) roughly comprises and the exchange current shown in Fig. 3 (b) is applied to the field circuit 50 of field coil 48 as excitation signal and carries out with magnetic test coil 49 signal processing part 60 that is electrically connected.Field circuit 50 comprises the multiple excitation penultimate amplifiers 51 corresponding respectively with the multiple magnetic sensor element 40 shown in Fig. 2, for providing the traffic pilot 52 of excitation signal to multiple excitation penultimate amplifier 51 successively and generating the amplifier 53 of excitation signal according to excitation command signal, this field circuit 50 provides to the field coil 48 of multiple magnetic sensor element 40 successively and carried out the excitation signal after amplifying through excitation penultimate amplifier 51.
The sensor output signal that signal processing part 60 exports according to the magnetic test coil 49 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, above-mentioned control part (not shown), according to described first signal S1 and secondary signal S2 and the relative position information between medium 1 and magnetic sensor device 40, detects in medium 1 whether there is multiple magnetic pattern and forming position thereof.
More specifically, signal processing part 60 comprise to magnetic sensor element 40 export sensor output signal amplify enlarging section 70, from enlarging section 70 export signal extract the extraction unit 80 of peak value and valley and there is the digital signal processing section 90 of A/D converter 91.Extraction unit 80 comprises the amplifying signal exported by amplifier 70 and outputs to traffic pilot 81, the clamp circuit 82 of rear class successively and carry out the signal that clamp circuit 82 exports offseting the skew adjustment part 83 adjusted.The polarity inversion circuit 822 that clamp circuit 82 comprises the first diode 821 that the sensor output signal after amplifying exported enlarging section 70 carries out rectification, the sensor output signal after amplifying that exports enlarging section 70 carries out reversal of poles and to the second diode 823 having carried out the signal after reversal of poles and carry out rectification in polarity inversion circuit 822.Thus, skew adjustment part 83 comprises to be carried out offseting the first offset adjusting circuit 831 of adjustment to the output of the first diode 821 and carries out offseting the second offset adjusting circuit 832, first offset adjusting circuit 831 of adjustment to the output of the second diode 823 and the second offset adjusting circuit 832 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, is also provided with gain configuration part 85 in the rear class of holding circuit 84.Holding circuit 84 comprises the first peak holding circuit 841 kept the peak value of the output signal of the first offset adjusting circuit 831 and the second peak holding circuit 842 kept the peak value of the output signal of the second offset adjusting circuit 832.Here, to the second offset adjusting circuit 832 input is that the signal exported from enlarging section 70 has carried out the signal after rectification through the second diode 823 after polarity inversion circuit 822 has carried out reversal of poles, again.Therefore, the valley hold circuit that the valley that the second peak holding circuit 842 is equivalent to the amplifying signal exported enlarging section 70 is kept.
The gain that gain configuration part 85 comprises the gain of value that gain setting first amplifier 851 (main amplifier) of the gain of the value that setting first peak holding circuit 841 keeps and setting the second peak holding circuit 842 (valley hold circuit) keep sets with the second amplifier 852 (main amplifier), the value that first peak holding circuit 841 and the second peak holding circuit 842 keep is set as the gain specified by this gain configuration part 85, then outputs to the A/D converter 91 of digital signal processing section 90.
Digital signal processing section 90 comprises adding circuit 92 and subtraction circuit 93, wherein, the value that the value that first peak holding circuit 841 keeps by adding circuit 92 and the second peak holding circuit 842 keep is added, thus generate the first signal S1, the value that first peak holding circuit 841 keeps by subtraction circuit 93 and the value that the second peak holding circuit 842 keeps are subtracted each other, thus generate secondary signal S2.Digital signal processing section 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 section 90 of said structure to export the first signal S1 and secondary signal S2 to upper control part (not shown), in above-mentioned control part, judge the true and false of medium 1 based on the first signal S1 and secondary signal S2.More specifically, detection unit is provided with in upper control part, first signal S1 and secondary signal S2 is associated with the relative position information between magnetic sensor element 40 and medium 1 by this detection unit, contrast with the Comparing patterns be previously recorded in recording unit, thus judge the true and false of medium 1, described detection unit carries out the process specified based on the program be previously recorded in the recording units such as ROM or RAM (not shown), thus judges the true and false of medium 1.
(detailed construction of enlarging section 70)
Fig. 5 is the key diagram being input to the signal of amplifier etc. in the enlarging section 70 of the magnetic pattern detecting apparatus 100 of first embodiment of the invention 1, Fig. 5 (a) is the key diagram of the waveform representing excitation signal, sensor output signal and reference voltage, and 5 (b) represents the key diagram having carried out the waveform after amplifying by the difference of enlarging section to sensor output signal and reference voltage.In Fig. 5 (a) and Fig. 5 (b), excitation signal is represented with solid line L1, represent sensor output signal with solid line L2, represent reference voltage with solid line L3, represent the signal after having been undertaken amplifying by the difference of amplifier to sensor output signal and reference voltage with solid line L4.
In the magnetic pattern detecting apparatus 100 of present embodiment, enlarging section 70 is as shown in Fig. 4 (b), there are the multiple amplifiers 71 (prime amplifier) corresponding respectively with multiple magnetic sensor element 40, to described amplifier 71 input reference voltage and the sensor output signal from magnetic sensor element 40 output.Here, enlarging section 70 possesses and generates the signal that changes in linkage with the excitation signal reference voltage generating unit 72 as reference voltage, and in present embodiment, the signal generated to amplifier 71 input reference voltage generating unit 72 is as reference voltage.
In present embodiment, reference voltage has with the waveform shown in solid line L3 in Fig. 5 (a) and Fig. 5 (b), and this waveform is equivalent to the waveform to obtaining after having carried out differential with the excitation signal shown in solid line L1 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 made up of electric capacity C and resistance R, the signal that this CR differentiating circuit 73 obtains after generating and having carried out differential to excitation signal is as reference voltage.Here, owing to being equivalent to the time diffusion to the magnetic flux that excitation signal produces with the sensor output signal shown in solid line L2 in Fig. 5 (a) and Fig. 5 (b), therefore, the reference voltage obtained after carrying out differential to excitation signal is synchronous with sensor output signal.If said reference voltage, then 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 also can not reach capacity, but as used shown in solid line L4 in Fig. 5 (b).
(Cleaning Principle)
Fig. 6 is the key diagram to the characteristic of the various magnetic inks that medium 1 is formed etc. in the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 1.Fig. 7 detects the key diagram that whether there is the principle of magnetic pattern in the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 1 from the medium 1 being formed with different types of magnetic pattern.
First, the principle of the true and false judging medium 1 when medium 1 moves along the direction of the arrow X1 shown in Fig. 1 and Fig. 2 is described.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 is different.More specifically, in medium 1, be formed with the first magnetic pattern utilizing the magnetic ink printing containing hard magnetic material and the second magnetic pattern utilizing the magnetic ink printing containing soft magnetic material.Here, containing 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 being applied with the residual magnetic flux density Br behind magnetic field is higher, but magnetic permeability μ is lower.In contrast to this, containing the magnetic ink of soft magnetic material as shown in its magnetic hysteresis loop in Fig. 6 (c1), the value being applied with the residual magnetic flux density Br behind magnetic field is lower, but magnetic permeability μ is higher.
Thus, as will be explained below, as long as measure residual magnetic flux density Br and magnetic permeability μ, the material of magnetic ink can just be differentiated.More specifically, because magnetic permeability μ is relevant to coercivity H, therefore, 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 different because of the difference of magnetic ink (magnetic material).Thus, the material of magnetic ink can be differentiated.In addition, although the measured value of residual magnetic flux density Br and magnetic permeability μ (coercivity H) can because of deep or light, the distance between medium 1 and magnetic sensor device 20 of ink and change, but in present embodiment, because magnetic sensor device 20 measures 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, the material of magnetic ink can reliably be differentiated.
In the magnetic pattern detecting apparatus 100 of present embodiment, medium 1 to move along the direction shown in arrow X1 and by magnetic sensor device 20 time, first, apply from magnetic field to apply magnetic field with the first magnet 31 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), export the signal corresponding with the BH curve of the sensor magnetic core 41 shown in Fig. 6 (a2) from the magnetic test coil 49 of magnetic sensor element 40.Thus, from shown in Fig. 4 adding circuit 92 export the first signal S1 and from subtraction circuit 93 export secondary signal S2 respectively as 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, then described first magnetic pattern is 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 have passed magnetic field applying magnet 30, the first magnetic pattern becomes magnet because coming the magnetic field of self-magnetic field applying magnet 30.Therefore, the signal exported 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 Fig. 6 (b3) and the waveform shown in Fig. 7 (a2).That is, the crest voltage of signal S0 and valley point voltage are as shown in arrow A 1, A2, 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.Thus, from shown in Fig. 4 adding circuit 92 export the first signal S1 as shown in Fig. 6 (b4), whenever medium 1 the first magnetic pattern by magnetic sensor element 40 time with regard to change.Here, due to lower by the magnetic permeability μ of the first magnetic pattern formed containing the magnetic ink of hard magnetic material, therefore affect the crest voltage of signal S0 and the skew of valley point voltage, can be considered the residual magnetic flux density Br only having the first magnetic pattern.Thus, even if the first magnetic pattern of medium 1 is by magnetic sensor element 40, the secondary signal S2 exported from the subtraction circuit 93 shown in Fig. 4 also can not change, 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, then the magnetic hysteresis loop of described second magnetic pattern is as shown in Fig. 6 (c1), through the inner side of the B-H loop of the first magnetic pattern formed by the magnetic ink containing hard magnetic material shown in Fig. 6 (b1), the value of residual magnetic flux density Br is lower.Therefore, though medium 1 by magnetic field applying with after magnet 30, 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 exported 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, thus magnetic permeability μ becomes large, correspondingly becomes Fig. 6 (c3) and the waveform shown in Fig. 7 (b2).That is, the crest voltage of signal S0 is as shown with arrow a 3 towards the skew of higher side, and valley point voltage is then as represented by arrow a 4 towards the skew of lower side.Now, the side-play amount of crest voltage and its absolute value of side-play amount of valley point voltage roughly equal.And described signal S0 changes along with moving of medium 1.Thus, from shown in Fig. 4 subtraction circuit 93 export secondary signal S2 as shown in Fig. 6 (c4), whenever medium 1 the second magnetic pattern by magnetic sensor element 40 time with regard to change.Here, because the residual magnetic flux density Br of the second magnetic pattern formed by the magnetic ink containing soft magnetic material is lower, therefore the crest voltage of signal and the skew of valley point voltage is had an impact, can be considered the magnetic permeability μ only having the second magnetic pattern.Thus, even if the second magnetic pattern of medium 1 is by magnetic sensor element 40, from the first signal S1 also not change that the adding circuit 92 shown in Fig. 4 exports, identical with the signal shown in Fig. 6 (c4).
Thus, in the magnetic pattern detecting apparatus 100 of present embodiment, the the first signal S1 obtained after being added with valley by the peak value of the signal exported from magnetic sensor element 40 with adding circuit 92 is the signal corresponding with the residual magnetic flux density value of magnetic pattern, if monitor described first signal S1, then can detect the first magnetic pattern and forming position thereof that whether exist and formed by the magnetic ink containing hard magnetic material.And the secondary signal S2 obtained after being subtracted each other with valley by the peak value of the signal exported from magnetic sensor element 40 with subtraction circuit 93 is the signal corresponding with the magnetic permeability μ of magnetic pattern, if monitor described secondary signal S2, then can detect the second magnetic pattern and forming position thereof that whether exist and formed by the magnetic ink containing soft magnetic material.Thus, can identify in medium 1 according to both residual magnetic flux density value and magnetic permeability value each magnetic pattern and forming position thereof of whether existing and applying the multiple magnetic pattern that residual magnetic flux density Br and magnetic permeability μ is different behind magnetic field.
(main efficacy results 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, whenever the sensor output signal that will export to amplifier 71 input reference voltage and the magnetic sensor element 40 of having carried out excitation by excitation signal, just the signal changed in linkage with excitation signal is generated in reference voltage generating unit 72, and using described signal as reference voltage input amplifier 71.Therefore, reference voltage is less with the difference of the sensor output signal exported from magnetic sensor element 40.Thus, even if do not add the circuit that bridge circuit etc. can cause cost to increase, also can improve the gain of amplifier 71, and S/N ratio can be improved.And, because reference voltage changes in linkage with excitation signal, so sensor output signal and reference voltage are synchronous, therefore, it is possible to suitably amplify sensor output signal.
In addition, due to reference voltage generating unit 72 generate have differential has been carried out to excitation signal after the signal of waveform that obtains be used as reference voltage, therefore, it is possible to reduce the difference of sensor output signal and reference voltage.Namely, because sensor output signal is equivalent to the time diffusion to the magnetic flux that excitation signal produces, if therefore use the reference voltage of signal as amplifier 71 of the waveform obtained after having carried out differential to excitation signal, then the difference of sensor output signal and reference voltage is less, thus can improve gain.
In addition, because reference voltage generating unit 72 has, differential is carried out thus the CR differentiating circuit 73 of generation reference voltage to excitation signal, therefore use the electronic component that such as electric capacity C, resistance R and so on are inexpensive, just can carry out differential to excitation signal thus generate reference voltage.
In addition, in the magnetic pattern detecting apparatus 100 of present embodiment, owing to being shared magnetic sensor device 20, detect whether there is each magnetic pattern and forming position thereof according to both residual magnetic flux density value and magnetic permeability value, therefore between the mensuration and the mensuration of magnetic permeability value of residual magnetic flux density value can not generation time poor.Thus, even when making magnetic sensor device 20 and medium 1 move to measure, signal processing part 60 also can carry out high-precision detection with simple structure.In addition, for conveyer 10, also only at it by the position of magnetic sensor device 20 requires operation stability, therefore can try hard to simplify structure.
And, magnetic pattern detecting apparatus 100 according to the present embodiment, for utilizing the magnetic ink containing both hard magnetic material and soft magnetic material be formed with the medium 1 of magnetic pattern or utilize the magnetic ink containing the material of the centre being positioned at hard magnetic material and soft magnetic material to be formed with the medium 1 of magnetic pattern, the detection of magnetic pattern also can be carried out.Namely, the such magnetic pattern in the centre of the first magnetic pattern and the second magnetic pattern is positioned at for magnetic characteristic, as shown in Fig. 6 (d1), the centre of the magnetic hysteresis loop of the magnetic pattern of the soft magnetic material shown in the magnetic hysteresis loop of the magnetic pattern of the hard magnetic material shown in Fig. 6 (b1) and Fig. 6 (c1) is positioned at due to magnetic hysteresis loop, therefore the signal pattern shown in Fig. 6 (d4) can be obtained, for described magnetic pattern, also can detect whether it exists and forming position.
And in the magnetic sensor device 20 of present embodiment, magnetic field applying magnet 30 is provided as magnetic field relative to magnetic sensor element 40 in the both sides of the moving direction of medium 1 and applies to apply with the second magnet 32 with the first magnet 31 and magnetic field.Therefore, as shown in Figure 1, magnetic field is utilized to apply to magnetize the medium 1 along the direction movement shown in arrow X1 with the first magnet 31, afterwards, utilize magnetic sensor element 40, the magnetic flux under the state applying bias magnetic field to the medium 1 after magnetization can be detected, and utilize magnetic field to apply to magnetize the medium 1 along the direction movement shown in arrow X2 with the second magnet 32, afterwards, utilize magnetic sensor element 40, the magnetic flux under the state applying bias magnetic field to the medium 1 after magnetization can be detected.Thus, if the magnetic pattern detecting apparatus 100 of present embodiment is used for automatic teller machine, then can judge stored in the true and false of medium 1, and also can judge the true and false of the medium 1 that will take out.
[the first embodiment 2]
Fig. 8 is the key diagram of enlarging section 70 peripheral structure in the circuit part of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 2.In addition, because the basic structure of present embodiment is identical with embodiment 1, therefore identical label is added for common part, and the description thereof will be omitted.
In the first embodiment 1, enlarging section 70 is provided with the multiple amplifiers 71 corresponding respectively with multiple magnetic sensor element 40, but in the present embodiment, as shown in Figure 8, traffic pilot 77 is set in the rear class of multiple magnetic sensor element 40, and amplifier 71 is set in the rear class of traffic pilot 77.Therefore, the sensor output signal exported from multiple magnetic sensor element 40 outputs to amplifier 71 successively by traffic pilot 77.Therefore, as long as just can amplify the sensor output signal exported from multiple magnetic sensor element 40 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 being provided with CR differentiating circuit 73 generates the signal changed in linkage with excitation signal, and described signal is input to amplifier 71 as reference voltage.Therefore, because reference voltage is less with the difference of the sensor output signal exported from magnetic sensor element 40, even if thus do not add the circuit that bridge circuit etc. can cause cost to raise, also can improve the gain etc. of amplifier 71, the effect identical with embodiment 1 like this can be realized.
In addition, in the first embodiment 1, be provided with the multiple excitation penultimate amplifiers 51 corresponding respectively with multiple magnetic sensor element 40, but in the present embodiment, traffic pilot 54 is set in the rear class of excitation penultimate amplifier 51, and multiple magnetic sensor element 40 is set in the rear class of traffic pilot 54.Therefore, the excitation signal exported from excitation penultimate amplifier 51 outputs to multiple magnetic sensor element 40 successively by traffic pilot 54.Thus, as long as just excitation signal can be provided to multiple magnetic sensor element 40 with an excitation penultimate amplifier 51.
In addition, this unwanted signal when switching to make traffic pilot 77, such as rear class can not be entered with the noise etc. produced during 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, add analog switch 79 in the output stage of amplifier 71, thus make noise etc. enter rear class.
[the first embodiment 3]
Fig. 9 is the key diagram of the structure of the enlarging section 70 of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 3, Fig. 9 (a) is the key diagram of the peripheral structure representing enlarging section 70, and Fig. 9 (b) is the key diagram of illusory magnetic sensor element.In addition, due to basic structure and first embodiment 1,2 identical of present embodiment, therefore identical label is added for common part, and the description thereof will be omitted.
In the first embodiment 1,2, employ 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.Thus, utilize illusory magnetic sensor element 74, the signal changed in linkage with excitation signal can be generated, and described signal is input to amplifier 71 as reference voltage.Here, illusory magnetic sensor element 74 be arranged on leave the medium mobile route 11 shown in Fig. 1 position on, thus by 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), have with reference to Fig. 2 (b) structure identical with the magnetic sensor element 40 that Fig. 3 (b) is illustrated, there is the structure of to reel on sensor magnetic core 41 field coil 48 and magnetic test coil 49.In addition, provide excitation signal by illusory excitation penultimate amplifier 510 to the field coil 48 of illusory magnetic sensor element 74, and the output of the magnetic test coil 49 of illusory magnetic sensor element 74 is supplied to amplifier 71 as reference voltage.
Adopt in the enlarging section 70 of this structure, illusory magnetic sensor element 74 carries out excitation by excitation signal, and the signal obtained carrying out differential to excitation signal exports from magnetic test coil 49.Here, the output signal of illusory magnetic sensor element 74 is equivalent to the time diffusion to the magnetic flux that excitation signal produces, and is the signal of the waveform obtained after having carried out differential to excitation signal.Therefore, due to the difference of reference voltage and sensor output signal can be made minimum, thus gain can be improved.
In addition, in present embodiment, the basis of the first embodiment 2 is provided with the reference voltage generating unit 72 with illusory magnetic sensor element 74, but also can the reference voltage generating unit 72 with illusory magnetic sensor element 74 be set on the basis of embodiment 1.
[the first embodiment 4]
Figure 10 is the key diagram of the peripheral structure of the enlarging section 70 of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 4.In addition, because the basic structure of present embodiment is identical with the first embodiment 1 ~ 3, therefore identical label is added for common part, and the description thereof will be omitted.
In first embodiment 1 ~ 3, skew adjustment part 83 is provided with in the rear class of clamp circuit 82, but in the present embodiment, as shown in Figure 10, in skew adjustment part 83, arrange electric capacity to the operational amplifier 831b of the first offset adjusting circuit 831 and operational amplifier 832b of the second offset adjusting circuit 832, the first offset adjusting circuit 831 and the second offset adjusting circuit 832 are formed respectively as first integral circuit 835 and second integral circuit 836.
Therefore, first integral circuit 835 is that positive component of signal carries out integration to the polarity in the signal exported from amplifier 71, and second integral circuit 836 is then that negative component of signal carries out integration to polarity wherein.Thus, even if very narrow from the pulsewidth of the signal of amplifier 71 output, but be that negative component of signal carries out integration respectively owing to can be also positive component of signal and polarity to polarity, thus amplitude variations is converted to area change, therefore just can improve apparent gain by simple structure.
In addition, present embodiment is also identical with the first embodiment 1, and in enlarging section 70, the reference voltage generating unit 72 being provided with CR differentiating circuit 73 generates the signal changed in linkage with excitation signal, and described signal is input to amplifier 71 as reference voltage.Therefore, because reference voltage is less with the difference of the sensor output signal exported from magnetic sensor element 40, even if thus do not add the circuit that bridge circuit etc. can cause cost to raise, also can improve the gain etc. of amplifier 71, the effect identical with embodiment 1 like this can be realized.
In addition, present embodiment have employed the structure arranging integrating circuit on the basis of the first embodiment 1, but also can adopt the structure arranging integrating circuit in the first embodiment 2,3.
[the first embodiment 5]
Figure 11 is the key diagram of the peripheral structure of the skew adjustment part 83 of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 5.In addition, because the basic structure of present embodiment is identical with the first embodiment 1 ~ 4, therefore identical label is added for common part, and the description thereof will be omitted.
In first embodiment 1 ~ 4, reference voltage generating unit 72 is provided with in enlarging section 70, 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, arrange electric capacity to the operational amplifier 831b of the first offset adjusting circuit 831 and operational amplifier 832b of the second offset adjusting circuit 832, the first offset adjusting circuit 831 and the second offset adjusting circuit 832 are formed respectively as first integral circuit 835 and second integral circuit 836.Therefore, first integral circuit 835 is that positive component of signal carries out integration to the signal Semi-polarity exported from magnetic sensor element 40, and second integral circuit 836 is then that negative component of signal carries out integration to its Semi-polarity.Thus, even if very narrow from the pulsewidth of the signal of amplifier 71 output, but be that negative component of signal carries out integration respectively owing to can be also positive component of signal and polarity to polarity, thus amplitude variations is converted to area change, therefore just can improve apparent gain by simple structure.
[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 identical label is added for 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 excitation signal is applied to field coil 48, but in the present embodiment, as shown in figure 12, field coil 48 and magnetic test coil 49 are connected in series, all excitation signal is applied to field coil 48 and magnetic test coil 49.And, amplifier 71 is connected with the coupling part between field coil 48 with magnetic test coil 49, signal is carried out 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 being exported as differential output by sensor output signal, differential output signal is exported to amplifier 71.Therefore, it is possible to 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 being provided with CR differentiating circuit 73 generates the signal changed in linkage with excitation signal, and described signal is input to amplifier 71 as reference voltage.Therefore, because reference voltage is less with the difference of the sensor output signal exported from magnetic sensor element 40, even if thus do not add the circuit that bridge circuit etc. can cause cost to raise, also can improve the gain etc. of amplifier 71, the effect identical with the first embodiment 1 like this can be realized.
In addition, present embodiment have employed the structure arranging integrating circuit on the basis of the first embodiment 1, but also can adopt the structure 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 making medium 1 and magnetic sensor device 20 relative movement, be that medium 1 is moved, but medium 1 also can be adopted fixing and the structure of magnetic sensor device 20 movement.In addition, in above-mentioned embodiment, employ permanent magnet as magnetic field applying magnet 30, 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 invents to Section 2 the embodiment be described.About the structure of the magnetic pattern detecting apparatus in the second embodiment, the structure of the magnetic sensor device used in magnetic pattern detecting apparatus, the structure of the magnetic sensor element used in magnetic sensor device, the characteristic etc. of the various magnetic inks formed in medium, from the medium being formed with different types of magnetic pattern, the principle that whether there is magnetic pattern is detected in magnetic pattern detecting apparatus, due to the Fig. 1 with the first embodiment can be used, Fig. 2, Fig. 3, Fig. 6, magnetic pattern detecting apparatus described in Fig. 7, magnetic sensor device, magnetic sensor element, the characteristic etc. of magnetic ink, detect the structure that the principle that whether there is magnetic pattern is identical, characteristic etc., principle, therefore, here to identical incomplete structure, it describes in detail.
[the second embodiment 1]
(structure of signal processing part 60)
Figure 13 is the key diagram of the electric structure of the magnetic pattern detecting apparatus 100 representing second embodiment of the invention 1, Figure 13 (a) is the integrally-built key diagram of major part in indication circuit portion, and Figure 13 (b) represents to scan multiple magnetic sensor element thus to become the key diagram of the situation of conducting state successively.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 recorded in Fig. 4 (a), therefore identical label is added for common part and be described.
In present embodiment, the circuit part 5 shown in Figure 13 (a) roughly comprises: the exchange current shown in Fig. 3 (b) is applied to the field circuit 50 of field coil 48 as excitation signal and carries out with the magnetic test coil 49 (with reference to Fig. 2 (b) and Fig. 3 (a)) of magnetic sensor element 40 signal processing part 60 that is electrically connected.Field circuit 50 comprises: multiple excitation penultimate amplifiers 51 corresponding respectively with the multiple magnetic sensor element 40 shown in Fig. 2, for providing the traffic pilot 52 of excitation signal to multiple excitation penultimate amplifier 51 successively and generating the amplifier 53 of excitation signal according to excitation command signal, and this field circuit 50 provides to the field coil 48 (with reference to Fig. 2 (b) and Fig. 3 (a)) of multiple magnetic sensor element 40 successively and carried out the excitation signal after amplifying through excitation penultimate amplifier 51.Sometimes also can the rear class of traffic pilot 52 arrange multiple magnetic sensor element 40 the excitation penultimate amplifier 51 that shares.
The sensor output signal that signal processing part 60 exports according to the magnetic test coil 49 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 outputted to upper control part (not shown).
More specifically, signal processing part 60 comprises enlarging section 70, extraction unit 80 and digital signal processing section 90, wherein, enlarging section 70 has the amplifier 71 amplified the sensor output signal of magnetic sensor element 40 output, extraction unit 80 extracts peak value and valley from the signal that enlarging section 70 exports, and digital signal processing section 90 has A/D converter 91.Extraction unit 80 comprises the amplifying signal exported by amplifier 70 and outputs to traffic pilot 81, the clamp circuit 82 of rear class successively and carry out the signal that clamp circuit 82 exports offseting the offset adjusting circuit 83 adjusted.The polarity inversion circuit 822 that clamp circuit 82 comprises the first diode 821 that the sensor output signal after amplifying exported enlarging section 70 carries out rectification, the sensor output signal after amplifying that exports enlarging section 70 carries out reversal of poles and to the second diode 823 having carried out the signal after reversal of poles and carry out rectification in polarity inversion circuit 822.Thus, offset adjusting circuit 83 comprises and carries out offseting the first offset adjusting circuit 831 of adjustment to the output of the first diode 821 and carry out offseting the second offset adjusting circuit 832, first offset adjusting circuit 831 of adjustment to the output of the second diode 823 and the second offset adjusting circuit 832 comprises skew adjustment reference voltage generating circuit 831a, 832a and operational amplifier 831b, 832b.Sometimes also can the rear class of traffic pilot 81 arrange multiple magnetic sensor element 40 the amplifier 71 that shares.
In addition, extraction unit 80 is also provided with holding circuit 84 in the rear class of offset adjusting circuit 83, is also provided with gain configuration part 85 in the rear class of holding circuit 84.Holding circuit 84 comprises the first peak holding circuit 841 kept the peak value of the output signal of the first offset adjusting circuit 831 and the second peak holding circuit 842 kept the peak value of the output signal of the second offset adjusting circuit 832.Here, to the second offset adjusting circuit 832 input is that the signal exported from enlarging section 70 has carried out the signal after rectification through the second diode 823 after polarity inversion circuit 822 has carried out reversal of poles, again.Therefore, the valley hold circuit that the valley that the second peak holding circuit 842 is equivalent to the amplifying signal exported enlarging section 70 is kept.
Gain configuration part 85 comprises: gain setting second amplifier 852 of gain setting the first amplifier 851 setting the gain of the value that the first peak holding circuit 841 keeps and the gain setting the value that the second peak holding circuit 842 (valley hold circuit) keeps, the value that first peak holding circuit 841 and the second peak holding circuit 842 keep is set as the gain specified by this gain configuration part 85, then outputs to the A/D converter 91 of digital signal processing section 90.
Digital signal processing section 90 comprises A/D converter 91, adding circuit 92 and subtraction circuit 93, wherein, the value that the value that first peak holding circuit 841 keeps by adding circuit 92 and the second peak holding circuit 842 keep is added, thus generate the first signal S1, the value that first peak holding circuit 841 keeps by subtraction circuit 93 and the value that the second peak holding circuit 842 keeps are subtracted each other, thus generate secondary signal S2.
Here, magnetic sensor element 40 as described later, in order to determine the magnetic characteristic in a region on medium 1, exports multiple signal (being four signals in present embodiment) in a scan period.Therefore, digital signal processing section 90 is provided with handling averagely portion 96 in the rear class of A/D converter 91.Thus, after four values that the first peak holding circuit 841 and the second peak holding circuit 842 keep are converted to digital signal by A/D converter 91, handling averagely portion 96 averages process to these four values, and the value that adding circuit 92 obtains after utilizing above-mentioned handling averagely carries out addition process.In addition, after four values that the first peak holding circuit 841 and the second peak holding circuit 842 keep are converted to digital signal by A/D converter 91, handling averagely portion 96 averages process to these four values, and subtraction circuit 93 values obtained after utilizing above-mentioned handling averagely carry out subtraction process.
Digital signal processing section 90 has the control signal efferent 94 of output switching control signal, excitation command signal, offset control signal etc., switch-over control signal controls traffic pilot 52,81, and controls on media width direction, namely, to be arranged with multiple scanning motions of magnetic sensor element 40 and the sequential of other circuit operation on the column direction Y that the moving direction and line direction X with medium 1 is orthogonal as shown in Fig. 2 (a), Fig. 2 (b) and Fig. 3 (b).
Adopt the digital signal processing section 90 of said structure to export the first signal S1 and secondary signal S2 to upper control part (not shown), in above-mentioned control part, judge the true and false of medium 1 based on the first signal S1 and secondary signal S2.More specifically, detection unit is provided with in upper control part, first signal S1 and secondary signal S2 is associated with the relative position information between magnetic sensor element 40 and medium 1 by this detection unit, contrast with the Comparing patterns be previously recorded in recording unit, thus judge the true and false of medium 1, described detection unit carries out the process specified based on the program be previously recorded in the recording units such as ROM or RAM (not shown), thus judges the true and false of medium 1.
(scanning motion of magnetic sensor element 40)
Figure 14 is the key diagram of the scanning motion of the magnetic pattern detecting apparatus 100 representing second embodiment of the invention 1 etc., Figure 14 (a) is the key diagram that plane earth represents the situation that magnetic sensor element 40 arranges on column direction Y, Figure 14 (b) carries out amplifying the key diagram represented to the layout of magnetic sensor element, Figure 14 (c) is the key diagram of position situation of movement on medium 1 residing when representing that the magnetic sensor element being in conducting state in the scan period scans at every turn, Figure 14 (d) is the key diagram that the situation of position movement on medium 1 residing when the magnetic sensor element being in conducting state in the scan period at every turn being scanned amplifies expression further.Figure 15 is the key diagram of the operation condition of the circuit part of the magnetic pattern detecting apparatus 100 representing second embodiment of the invention 1, Figure 15 (a) represents the frequency of detection signal and the key diagram of the relation kept between action of sampling, and Figure 15 (b) is the key diagram of the frequency characteristic representing the handling averagely portion 96 shown in A/D converter 91 and Figure 13 (a).
As shown in Figure 14 (a) He Figure 14 (b), in the magnetic pattern detecting apparatus 100 of present embodiment, on the column direction Y (media width direction) orthogonal with the moving direction X of medium 1, be arranged with 20 magnetic sensor element 40 and be respectively used to channel C H1 ~ CH20, by scanning these 20 magnetic sensor element 40 on column direction Y, detect magnetic pattern from the whole Width of medium 1.That is, as long as scan multiple magnetic sensor element 40 in a column direction, just data can be detected respectively by 20 of a channel C H1 ~ CH20 magnetic sensor element 40.And medium 1 is that (moving direction X) is mobile in the row direction.Therefore, it is possible to 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 1 being undertaken transmitting by connecting gear 10 is set to v (mm/ μ s), the size of magnetic sensor element 40 on moving direction X is set to T (mm), time per unit ta (μ s) is set to N time the scanning times that magnetic sensor element 40 scans on described column direction Y, then movement speed v, unit interval ta, size T and scanning times N meet following relational expression:
(v×ta)≤(T×N)
In formula, N is the integer of more than 2.
In formula, unit interval ta is a scan period of the row magnetic pattern for detecting medium 1.Therefore, in present embodiment, in a scan period, column direction Y carries out N scanning to magnetic sensor element 40, scan by described N time all data obtained based on magnetic sensor element 40, 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 such as set as following condition:
Movement speed v=0.0016mm/ μ the s of medium;
Unit interval ta (scan period)=200 μ s (5kHz);
The size T of magnetic sensor element 40 on the moving direction X of medium 1 (thickness size)=0.3mm;
Scanning times N=4 in unit interval ta (scan period).
Thus, one scan period medium 1 displacement etc. become following condition:
One scan period medium 1 displacement=0.32mm;
Displacement=the 0.08mm of single pass medium 1;
Scan each time required time=50 μ s (20kHz);
Magnetic sensor element 40 be in single pass conducting state time=2.5 μ s.
If these conditions above-mentioned, then owing to becoming following setting value:
(v×ta)＝0.32mm
(T×N)＝1.2mm
Therefore following relational expression is fully met:
(v×ta)≤(T×N)
In formula, N is the integer of more than 2.
Thus if scan along column direction Y magnetic sensor element 40 under these conditions, then after single pass terminates, medium 1 moves 0.08mm, but magnetic sensor element 1 size is in the direction of movement 0.3mm.Therefore, present scan and when next time scanning, the equimultiple view field of magnetic sensor element 40 on medium 1 overlaps on moving direction X.
More specifically, as shown in Figure 14 (c) He Figure 14 (d).In Figure 14 (c) and Figure 14 (d), the region (being in the equimultiple view field of magnetic sensor element 40 on medium 1 of the channel C H1 of conducting state) at magnetic sensor element 40 place in the on-state of the channel C H1 when first time scanning in the n-th scan period is represented with solid line SCH (n, 1).And the region at magnetic sensor element 40 place in the on-state of the channel C H1 when second time scanning in this scan period (the n-th scan period) is represented with single dotted broken line SCH (n, 2).The region at magnetic sensor element 40 place in the on-state of the channel C H1 when third time scanning in this scan period (the n-th scan period) is represented with dotted line SCH (n, 3).The region at magnetic sensor element 40 place in the on-state of the channel C H1 when the 4th scanning in this scan period (the n-th scan period) is represented with double dot dash line SCH (n, 4).In addition, when each scanning, the region at magnetic sensor element 40 place is in the on-state moved on media width direction and column direction Y on same position, but easily identify to make the position in each region, in Figure 14 (c) and Figure 14 (d), the position in each region is slightly offset in a column direction.In Figure 14 (c) and Figure 14 (d), as the region at the place in the on-state of magnetic sensor element 40 in (n+1)th scan period, illustrate only the region at magnetic sensor element 40 place of the channel C H1 when first time scanning in (n+1)th scan period.
In present embodiment, owing to meeting above-mentioned relation formula, therefore within a scan period, first time scanning time magnetic sensor element 40 place region, with second time scan time magnetic sensor element 40 place region overlap on moving direction X.During second time scanning and third time when scan between, third time when scanning and when scanning for the 4th time between too, during present scan magnetic sensor element 40 place region, and when scanning next time the region at magnetic sensor element 40 place overlap on moving direction X.Thus, during present scan and when scanning next time, the equimultiple view field of the position that during present scan, magnetic sensor element 40 is in conducting state on medium 1 and on can not produce gap between the equimultiple view field on medium 1 of magnetic sensor element 40 is in conducting state when once scanning position.The magnetic sensor element 40 of other passage too.
In addition, by in this scan period (the n-th scan period) first time ~ the 4th scanning time channel C H1 the region at magnetic sensor element 40 place in the on-state add up to after region SCH1 (n) that obtains, by solid line SCH (n, 1) region shown in, single dotted broken 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)th scan period) when first time is scanned the region (solid line CH1 (n+1 at magnetic sensor element 40 place in the on-state, 1) region shown in) overlap in the direction of movement.Thus, can not gap be produced between the equimultiple view field of the position that in the equimultiple view field of the position that when scanning the last time in this scan period, magnetic sensor element 40 is in conducting state on medium 1 and next scan period, magnetic sensor element 40 is in conducting state when first time is scanned on medium 1.In addition, the magnetic sensor element 40 of other passage too.
Above-mentioned scanning motion is as shown in Figure 13 (b), in a scan period, the scanning making the magnetic sensor element 40 of each channel C H1 ~ CH20 become conducting state successively amounts to execution four times, A/D converter 91 shown in Figure 13 (a) and above-mentioned action become the sequential of conducting state in linkage according to each magnetic sensor element 40, convert the signal that magnetic sensor element 40 exports to digital signal to each passage with the sampling period of 50 μ s (sample frequency=20kHz).
In present embodiment, the magnetic sensor element 40 of each passage being in time shorten to the 2.5 μ s of conducting state, is thus 2MHz by the frequency respective settings of the excitation signal shown in Fig. 3 (b).Therefore, as shown in Figure 15 (a), within the time (2.5 μ s) being once in conducting state, magnetic sensor element 40 exports the component of signal (sensor output signal) shown in multiple (being three in present embodiment) Fig. 3 (c) to the extraction unit 80 shown in Figure 13 (a).Namely, the component of signal that the frequency that excitation signal has makes the excitation signal containing multiple cycle in the signal that in single pass, multiple magnetic sensor element 40 exports separately form, therefore, the detection signal that in single pass, multiple magnetic sensor element 40 exports separately comprises multiple component of signal all respectively.Thus, even if the time that magnetic sensor element 40 is in conducting state shortens, but keep, therefore, it is possible to reliably carry out peak value maintenance 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.
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), all by the sample frequency of A/D converter 91,20kHz is set as to each channel C H, sets it to lower frequency.Therefore, it is possible to suitably the signal that magnetic sensor element 40 exports is converted to digital signal.Namely, for the structure be illustrated with reference to Figure 18, as in Figure 15 (b) represented by dashed line as a reference example shown in, the sample frequency of A/D converter 91 is set as 1MHz, even if then in the time being once in conducting state, (par of the signal after keeping in Figure 15 (a)) is carried out four times and is sampled and be averaging processing, but for the noise of frequency higher than the high fdrequency component of signal band (5kHz), still there is the problem that its noise reduction is very little.And in the present embodiment, owing to the sample frequency of A/D converter 91 to be set as 20kHz, therefore, even if carry out four average treatment in the same manner, the noise of frequency higher than the high fdrequency component of 5kHz also can be reduced.
(main efficacy results 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, the size T of magnetic sensor element 40 on moving direction X (mm), time per unit ta (μ s) meet following relational expression to the scanning times N that magnetic sensor element 40 scans on media width direction and column direction Y:
(v×ta)≤(T×N)
In formula, N is the integer of more than 2
Therefore, gap can not be produced between the region that during present scan, magnetic sensor element 40 is residing in the on-state and the region that when scanning, magnetic sensor element 40 is residing in the on-state next time.Thus, even employing scans the multiple magnetic sensor element 40 arranged along column direction Y and makes medium 1 relative to the mode of magnetic sensor 40 movement, also reliably magnetic pattern can be detected from all surfaces of medium 1.
In present embodiment, unit interval ta is used to a scan period of the row magnetic pattern detecting medium 1, based on the data that magnetic sensor element 40 is obtained by the scanning carried out in a described scan period, detects a row magnetic pattern of medium 1.That is, in a scan period in order to detect a row magnetic pattern, carry out N scanning (being four scanning in present embodiment).Therefore, because multiple data that can obtain based on Multiple-Scan detect a row magnetic pattern, even when therefore affecting containing noise etc. in any one data that magnetic sensor element 40 obtains, the impact that above-mentioned noise produces also can be relaxed.
In addition, in present embodiment, owing to scanning by what carry out in a scan period the row magnetic pattern that all data obtained detect medium 1 based on magnetic sensor element 40 for N time, therefore, present scan and when next time scanning, the equimultiple view field of magnetic sensor element 40 on medium 1 can overlap.Thus, the magnetic characteristic of medium 1 can be detected accurately.
In addition, in the magnetic pattern detecting apparatus 100 of present embodiment, owing to being shared magnetic sensor device 20, detect whether there is each magnetic pattern and forming position thereof according to both residual magnetic flux density value and magnetic permeability value, therefore between the mensuration and the mensuration of magnetic permeability value of residual magnetic flux density value can not generation time poor.Thus, even when making magnetic sensor device 20 and medium 1 move to measure, signal processing part 60 also can carry out high-precision detection with simple structure.In addition, for conveyer 10, also only at it by the position of magnetic sensor device 20 requires operation stability, therefore can try hard to simplify structure.
And, magnetic pattern detecting apparatus 100 according to the present embodiment, for utilizing the magnetic ink containing both hard magnetic material and soft magnetic material be formed with the medium 1 of magnetic pattern or utilize the magnetic ink containing the material of the centre being positioned at hard magnetic material and soft magnetic material to be formed with the medium 1 of magnetic pattern, the detection of magnetic pattern also can be carried out.Namely, the such magnetic pattern in the centre of the first magnetic pattern and the second magnetic pattern is positioned at for magnetic characteristic, as shown in Fig. 6 (d1), the centre of the magnetic hysteresis loop of the magnetic pattern of the soft magnetic material shown in the magnetic hysteresis loop of the magnetic pattern of the hard magnetic material shown in Fig. 6 (b1) and Fig. 6 (c1) is positioned at due to magnetic hysteresis loop, therefore the signal pattern shown in Fig. 6 (d4) can be obtained, for described magnetic pattern, also can detect whether it exists and forming position.
And in the magnetic sensor device 20 of present embodiment, magnetic field applying magnet 30 is provided as magnetic field relative to magnetic sensor element 40 in the both sides of the moving direction of medium 1 and applies to apply with the second magnet 32 with the first magnet 31 and magnetic field.Therefore, as shown in Figure 1, magnetic field is utilized to apply to magnetize the medium 1 along the direction movement shown in arrow X1 with the first magnet 31, afterwards, utilize magnetic sensor element 40, the magnetic flux under the state applying bias magnetic field to the medium 1 after magnetization can be detected, and utilize magnetic field to apply to magnetize the medium 1 along the direction movement shown in arrow X2 with the second magnet 32, afterwards, utilize magnetic sensor element 40, the magnetic flux under the state applying bias magnetic field to the medium 1 after magnetization can be detected.Thus, if the magnetic pattern detecting apparatus 100 of present embodiment is used for automatic teller machine, then can judge stored in the true and false of medium 1, and also can judge the true and false of the medium 1 that will take out.
[the second embodiment 2]
Figure 16 is the key diagram of magnetic sensor element 40 position at place when each scanning of the magnetic pattern detecting apparatus 100 representing second embodiment of the invention 2.In addition, the basic structure of present embodiment and the identical of the second embodiment 1.Therefore, in the following description, also the description thereof will be omitted to add identical label to common part.
The magnetic pattern detecting apparatus 100 of present embodiment is also identical with the second embodiment 1, and the movement speed v (mm/ μ s) of medium 1, the size T of magnetic sensor element 40 on moving direction X (mm), time per unit ta (μ s) meet following relational expression to the scanning times N that magnetic sensor element 40 scans on column direction Y:
(v×ta)≤(T×N)
In formula, N is the integer of more than 2.
Therefore, as shown in figure 16, first time ~ the 4th scanning in carry out continuously twice sweep time, the region at magnetic sensor element 40 place in the on-state overlaps in the direction of movement.Here, in embodiment 1, scan by what carry out in a scan period the row magnetic pattern that all data obtained detect medium 1 based on magnetic sensor element 40 for four times, and in present embodiment, be then scan by the part in carry out in a scan period N time scanning the row magnetic pattern that the data obtained detect medium 1 based on magnetic sensor element 40.
More specifically, in present embodiment, based on magnetic sensor element 40 by carry out in a scan period scan for N time in meet and multiple data of obtaining of the scanning being less than N time more than twice of following condition, detect a row magnetic pattern of medium 1, this condition is: present scan and when next time scanning, and magnetic sensor element 40 equimultiple view field on media described overlaps on the moving direction X of medium 1.
Such as, as shown in figure 16, during first time scanning the magnetic sensor element 40 of channel C H1 in the on-state place region, the region at magnetic sensor element 40 place in the on-state of channel C H1 overlaps on moving direction X when scanning with third time.Therefore, in the present embodiment, the data obtained when being scanned by first time magnetic sensor element 40 and magnetic sensor element 40 average process by the data obtained during third time scanning, 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 present scan (first time scanning) and scanning next time (third time scanning), because the region at magnetic sensor element 40 place in the on-state overlaps, therefore, it is possible to detect the magnetic characteristic of medium 1 accurately on moving direction X.In addition, due to a row magnetic pattern can be detected based on the data obtained by twice sweep, even when therefore affecting containing noise etc. in any one data that magnetic sensor element 40 obtains, the impact that above-mentioned noise produces also can be relaxed.
In addition, also can according to the movement speed v of medium 1, the size T of magnetic sensor element 40 on moving direction X, time per unit ta (μ s) on column direction Y to the scanning times N etc. that magnetic sensor element 40 scans, based on magnetic sensor element 40 by carry out in a scan period scan for N time in meet and multiple data of obtaining of the scanning being less than N time more than twice of following condition, detect a row magnetic pattern of medium 1, this condition is: present scan and when next time scanning, the equimultiple view field of magnetic sensor element 40 on medium 1 does not overlap but continuously on the moving direction X of medium 1.
[the second embodiment 3]
Figure 17 is the key diagram of magnetic sensor element 40 position at place and position of sensor sensing range thereof when each scanning of the magnetic pattern detecting apparatus 100 representing second embodiment of the invention 3.In addition, the basic structure of present embodiment and the identical of the second embodiment 1.Therefore, in the following description, also the description thereof will be omitted to add identical label to common part.
The magnetic pattern detecting apparatus 100 of present embodiment is also identical with the second embodiment 1, and the movement speed v (mm/ μ s) of medium 1, the size T of magnetic sensor element 40 on moving direction X (mm), time per unit ta (μ s) meet following relational expression to the scanning times N that magnetic sensor element 40 scans on column direction Y:
(v×ta)≤(T×N)
In formula, N is the integer of more than 2.
Therefore, as shown in figure 17, first time ~ the 4th scanning in carry out continuously twice sweep time, the region at magnetic sensor element 40 place in the on-state overlaps in the direction of movement.Here, in embodiment 1, scan by what carry out in a scan period the row magnetic pattern that all data obtained detect medium 1 based on magnetic sensor element 40 for four times, and in present embodiment, be then scan by the part in carry out in a scan period N time scanning the row magnetic pattern that the data obtained detect medium 1 based on magnetic sensor element 40.
More specifically, as shown in figure 17, the sensor sensing range of the reality of magnetic sensor element 40 is greater than the equimultiple view field of this magnetic sensor element 40 on medium 1, and the size 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, meet in being scanned by carry out in a scan period N time based on magnetic sensor element and multiple data of obtaining of the scanning being less than N time more than twice of following condition, detect a row magnetic pattern of medium 1, this condition is: present scan and when next time scanning, and sensor sensing range overlaps on the moving direction X of medium 1.
Such as, as shown in figure 17, first time scanning time channel C H1 magnetic sensor element 40 sensor sensing range in the on-state, with third time scan time channel C H1 magnetic sensor element 40 sensor sensing range in the on-state overlap.Therefore, in the present embodiment, the data obtained when being scanned by first time magnetic sensor element 40 and magnetic sensor element 40 average process by the data obtained during third time scanning, 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 present scan (first time scanning) and scanning next time (third time scanning), because the sensor sensing range of magnetic sensor element 40 overlaps on moving direction X, therefore, it is possible to detect the magnetic characteristic of medium 1 accurately.In addition, due to a row magnetic pattern can be detected based on the data obtained by twice sweep, even when therefore affecting containing noise etc. in any one data that magnetic sensor element 40 obtains, the impact that above-mentioned noise produces also can be relaxed.
In addition, also can according to the movement speed v of medium 1, the size T of magnetic sensor element 40 on moving direction X, time per unit ta (μ s) on column direction Y to the scanning times N etc. that magnetic sensor element 40 scans, based on magnetic sensor element 40 by carry out in a scan period scan for N time in meet and multiple data of obtaining of the scanning being less than N time more than twice of following condition, detect a row magnetic pattern of medium 1, this condition is: present scan and when next time scanning, sensor sensing range does not overlap but continuously on the moving direction X of medium 1.
(other embodiment of the second embodiment)
In above-mentioned embodiment, when making medium 1 and magnetic sensor device 20 relative movement, be that medium 1 is moved, but medium 1 also can be adopted fixing and the structure of magnetic sensor device 20 movement.In addition, in above-mentioned embodiment, employ permanent magnet as magnetic field applying magnet 30, but also can use electromagnet.
In above-mentioned embodiment, describe the example being detected a row magnetic pattern of medium 1 based on magnetic sensor element 40 by the data that four times in carry out in a scan period N time scanning or twice sweep obtain, but also can scan by once or three times in carry out in a scan period N time scanning the row magnetic pattern that the data obtained detect medium 1 based on magnetic sensor element 40, as long as scan by the one or many in carry out in a scan period N time scanning the row magnetic pattern that the data obtained detect medium 1 based on magnetic sensor element 40.More specifically, N scanning is carried out in a scan period, data are obtained by magnetic sensor element 40 during each scanning, but when determining a row magnetic pattern of medium 1, the data that the single pass in N the scanning using magnetic sensor element 40 to pass through to carry out in a scan period or Multiple-Scan obtain.
In addition, in above-mentioned embodiment, describe based on magnetic sensor element 40 by carry out in a scan period scan for N time in meet following condition the data that obtain of Multiple-Scan, detect the example of a row magnetic pattern of medium 1, this condition is: present scan and when next time scanning, the sensor sensing range of magnetic sensor element 40 is mutually continuous, but the data that the Multiple-Scan that also can pass through to meet following condition in N the scanning carried out in a scan period based on magnetic sensor element 40 obtains, detect a row magnetic pattern of medium 1, this condition is: present scan and when next time scanning, the sensor sensing range of magnetic sensor element 40 is discontinuous and spaced apart.Can also based on by present scan and on once scan time magnetic sensor element 40 the data that obtain of the consecutive scanning of sensor sensing range and by present scan and on once scan time magnetic sensor element 40 the data that obtain of sensor sensing range scanning discontinuous and spaced apart, detect a row magnetic pattern of medium 1.
In addition, detected a row magnetic pattern of medium 1 by the data obtained during any single pass in carry out in a scan period N time scanning based on magnetic sensor element 40, this also can be variable, at random can set according to being sent to the instruction of digital signal processing section 90 from upper control part or outside.According to this structure, then can accuracy of detection required by the kind of medium 1 and magnetic pattern detecting apparatus 100 etc. and realize best action.

Claims (6)

1. a magnetic pattern detecting apparatus, the signal processing part of the magnetic sensor element comprising the magnetic characteristic for detecting medium and the magnetic pattern detecting described medium based on the testing result of this magnetic sensor element, is characterized in that,
Described signal processing part has enlarging section, and this enlarging section is amplified the sensor output signal that the described magnetic sensor element of having carried out excitation by excitation signal exports,
Described enlarging section comprises amplifier and reference voltage generating unit, wherein, input described sensor output signal and reference voltage to described amplifier, the signal that described reference voltage generating unit generates and described excitation signal changes in linkage is as described reference voltage.
2. magnetic pattern detecting apparatus as claimed in claim 1, is characterized in that,
Described reference voltage be have differential has been carried out to described excitation signal after the signal of waveform that obtains.
3. magnetic pattern detecting apparatus as claimed in claim 2, is characterized in that,
Described reference voltage generating unit has CR differentiating circuit, and this CR differentiating circuit carries out differential to described excitation signal thus generates described reference voltage.
4. magnetic pattern detecting apparatus as claimed in claim 2, is characterized in that,
Described reference voltage generating unit has illusory magnetic sensor element, and this illusory magnetic sensor element carries out excitation by described excitation signal, and the signal that output obtains after carrying out differential to this excitation signal is as described reference voltage.
5. magnetic pattern detecting apparatus as claimed in claim 1, 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 carries out integration to the signal Semi-polarity exported from described amplifier, and described second integral circuit is that negative component of signal carries out integration to the signal Semi-polarity exported from described amplifier.
6. magnetic pattern detecting apparatus as claimed in claim 1, is characterized in that,
Described magnetic sensor element has multiple coil exported for described sensor output signal is carried out differential output.
CN201180001718.7A 2010-02-05 2011-01-13 Magnetic pattern detection device Expired - Fee Related CN102369558B (en)

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CN201410310573.4A CN104123781B (en) 2010-02-05 2011-01-13 Magnetic pattern detection device
CN201410310405.5A CN104063938B (en) 2010-02-05 2011-01-13 Magnetic pattern detecting apparatus

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KR20140082849A (en) 2014-07-02

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