CN104123781B - Magnetic pattern detection device - Google Patents

Magnetic pattern detection device Download PDF

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Publication number
CN104123781B
CN104123781B CN201410310573.4A CN201410310573A CN104123781B CN 104123781 B CN104123781 B CN 104123781B CN 201410310573 A CN201410310573 A CN 201410310573A CN 104123781 B CN104123781 B CN 104123781B
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China
Prior art keywords
magnetic
sensor element
scanning
magnetic sensor
medium
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CN201410310573.4A
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Chinese (zh)
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CN104123781A (en
Inventor
百濑正吾
野口直之
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Nidec Sankyo Corp
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Nidec Sankyo Corp
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Priority claimed from JP2010024789A external-priority patent/JP5534843B2/en
Priority claimed from JP2010024787A external-priority patent/JP5534842B2/en
Application filed by Nidec Sankyo Corp filed Critical Nidec Sankyo Corp
Publication of CN104123781A publication Critical patent/CN104123781A/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 different from the sensor output signal output from the magnetic sensor element, the amplifier gain can be increased.

Description

Magnetic pattern detecting apparatus
The application be invention entitled " magnetic pattern detecting apparatus ", international filing date be January 13, application number in 2011 Divisional application for the application for a patent for invention of 201180001718.7 (international application no is pct/jp2011/050449).
Technical field
The present invention relates to a kind of magnetic to media such as the object being provided with magnetic, the bank note being printed with magnetic ink The magnetic pattern detecting apparatus that property pattern is detected.
Background technology
From objects such as the cards being provided with magnetic, the medium such as the bank note that printed with magnetic ink detect magnetic In the magnetic pattern detecting apparatus of pattern, when detecting that using magnetic sensor element medium passes through this magnetic pattern detecting apparatus The flux change producing, and using signal processing part, the sensor output signal that magnetic sensor element exports is carried out at signal Reason.Here, in signal processing part, constitute enlarging section with amplifier, to this amplifier input pickup output signal with by solid Determine the reference voltage of voltage formation, after sensor output signal being exaggerated using enlarging section, carry out various signals Process (with reference to patent document 1～3).
And, in this magnetic pattern detecting apparatus, detect that using magnetic sensor element medium passes through this magnetic The flux change producing during pattern detection device, and magnetic pattern is detected according to the signal of magnetic sensor element output.This In, shown in magnetic sensor element such as Figure 18 (a), 18 (b), in the column direction that the moving direction x (line direction) with medium 1 is orthogonal On y (media width direction), for example, it is arranged with 20 magnetic sensor element and is respectively used to passage ch1～ch20, by row On the y of direction, this 20 magnetic sensor element 40 are scanned, to detect magnetic chart on whole width for the medium 1 Case.
That is, if single pass is carried out to the multiple magnetic sensor element 40 shown in Figure 18 (a), 18 (b), due to passage 20 magnetic sensor element 40 of ch1～ch20 can detect data, therefore, such as shown in Figure 18 (d), and if magnetic transducing The detection data of magnetic sensor element 40 is converted into by device element 40 timing synchronization ground in the conduction state with a/d converter Data signal, then be capable of detecting when a row magnetic pattern of medium 1.Here, magnetic sensor element 40 is 500khz by frequency Excitation signal carry out excitation.
And medium 1 is that x moves in the row direction.Therefore, if represent magnetic sensor element 40 in conducting with hatched example areas Residing region under state, then, as shown in Figure 18 (c), in medium 1, during present scan, magnetic sensor element 40 is in conducting shape Under state, residing region (being labelled with the region to top-right oblique line) and magnetic sensor element 40 when next time scanning are being led Under logical state, residing region (being labelled with the region of oblique line to the right) is adjacent in the side contrary with moving direction x.From And, it is capable of detecting when the magnetic pattern on whole medium 1.
Patent document 1: Japanese Patent Laid-Open 2007-241653 publication
Patent document 2: Japanese Patent Laid-Open 2007-241654 publication
Patent document 3: Japanese Patent Laid-Open 2009-163336 publication
Content of the invention
However, in structure described in patent document 1～3, when being amplified to sensor output signal, due to using The reference voltage as amplifier for the fixed voltage, therefore sensor output signal is larger with the difference of reference voltage.Based on above-mentioned Reason, in order that the signal of amplifier output is unlikely to saturation, needs to suppress relatively low by the gain of amplifier, therefore exists no Method improves the problem of detection gain.On the other hand, if being carried out to the output signal of magnetic sensor element using bridge circuit Differential amplification, then there is a problem of leading to cost to be substantially increased.
And, the multiple magnetic sensor element 40 arranging along column direction y are being scanned and so that medium 1 is moved In the magnetic pattern detecting apparatus of this dynamic mode, can be because the translational speed of medium 1, magnetic sensor element 40 be in medium 1 Moving direction x on size, sweep speed, and lead to magnetic sensor element 40 during present scan residing in the on-state Region (being labelled with the region to top-right oblique line) with next time scan when magnetic sensor element 40 in the on-state Gap g is produced, such as shown in Figure 18 (c) between residing region (being labelled with the region of oblique line to the right).For example, work as medium 1 translational speed is 0.0016mm/ μ s, when the sweep time of the magnetic sensor element on column direction y is 200 μ s, once sweeps After the completion of retouching, medium 1 moves 0.32mm, but, if in this case, magnetic sensor element 1 chi in the direction of movement Very little for 0.3mm, then magnetic sensor element 40 region residing in the on-state and magnetic when next time scanning during present scan The gap g of 0.02mm can be produced between property sensor element 40 region residing in the on-state.Therefore, in medium 1 Being equivalent to the region of gap g, its magnetic characteristic cannot being detected with magnetic sensor element 40, thus being difficult to accurately from medium 1 all surfaces detect magnetic pattern.
On the other hand, the sensor detection range being had due to magnetic sensor element 40 is generally in magnetic sensor element 40 more than the equimultiple projected area on medium 1, therefore, if with the sensor detection range can coverage gap g, with regard to energy Detect magnetic pattern from all surfaces of medium 1, but, even in this case, also can be because of the mobile speed of medium 1 Degree, the size of sensor detection range on the moving direction x of medium 1 for the magnetic sensor element 40, sweep speed, and be difficult to Avoid the sensor detection range in present scan and on produce gap g between sensor detection range when once scanning.
In view of the above problems, the invention solves the problems that first technical problem be provide one kind will not be significantly increased into This and the magnetic pattern detecting apparatus of gain can be improved.
The invention solves the problems that second technical problem be provide a kind of even with multiple to arrange along column direction Magnetic sensor element is scanned and makes the mode that medium moves with respect to magnetic sensor, also can be reliably from Jie The all surfaces of matter detect the magnetic pattern detecting apparatus of magnetic pattern.
In order to solve above-mentioned first technical problem, the magnetic pattern detecting apparatus of the present invention are included for detecting medium The magnetic sensor element of magnetic characteristic and the testing result based on this magnetic sensor element are detecting the magnetic chart of described medium It is characterised in that described signal processing part has enlarging section, this enlarging section is carried out the signal processing part of case to by excitation signal The sensor output signal that the described magnetic sensor element of excitation is exported is amplified, described enlarging section include amplifier and Reference voltage generating unit, wherein, inputs described sensor output signal and reference voltage, described reference voltage to described amplifier Generating unit generates the signal changing in linkage with described excitation signal as described reference voltage.
In the present invention, when being amplified to sensor output signal with amplifier, due to linking using with excitation signal The reference voltage that changes, therefore from the difference of the sensor output signal of magnetic sensor element output and reference voltage relatively Little.Thus, even if not adding the circuit that bridge circuit etc. can lead to cost to increase, also can improve the gain of amplifier, and can carry High s/n ratio.Being additionally, since reference voltage is to change in linkage with excitation signal, and is synchronous with sensor output signal , therefore, it is possible to suitably be amplified to sensor output signal.
In the present invention, described reference voltage preferably has the waveform that described excitation signal has been carried out with obtain after differential Signal.Because sensor output signal is equivalent to the time diffusion to magnetic flux produced by excitation signal, if therefore using to encouraging The signal of the waveform that magnetic signal has obtained after having carried out differential as the reference voltage of amplifier, then due to sensor output signal with The difference of reference voltage less such that it is able to improve gain.
In the present invention, described reference voltage generating unit is preferably provided with and carries out differential to described excitation signal thus generating described The cr differential circuit of reference voltage.By using this structure, using the inexpensive electronic component of such as electric capacity, resistance etc, just Can constitute and differential is carried out thus generating the differential circuit of reference voltage to excitation signal.
In the present invention, described reference voltage generating unit can also have illusory magnetic sensor element, and this illusory magnetic passes Sensor component carries out excitation by described excitation signal, and exports and carry out the signal obtaining after differential as described to this excitation signal Reference voltage.The output signal of illusory magnetic sensor element is equivalent to the time diffusion to magnetic flux produced by excitation signal, So as to generate the signal of the waveform that excitation signal has been carried out with obtain after differential as reference voltage.According to said reference Voltage, then because this reference voltage is minimum with the difference of sensor output signal, 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 The component of signal that in the signal that one integrating circuit exports to described amplifier, polarity is positive is integrated, described second integral circuit The component of signal being negative to polarity in the signal of described amplifier output is integrated.According to this structure, even if then from putting The pulsewidth of the signal of big device output is very narrow, but due to can be also positive component of signal to polarity and polarity is negative component of signal It is integrated respectively, thus amplitude variations are converted to area change, therefore just can improve apparent gain with simple structure.
The magnetic pattern detecting apparatus of another embodiment of the present invention include the magnetic of the magnetic characteristic for detecting medium Sensor element and the testing result based on this magnetic sensor element are detecting the signal transacting of the magnetic pattern of described medium Portion is it is characterised in that described signal processing part includes first integral circuit and second integral circuit, wherein, described first integral Circuit described sensor is exported in polarity be positive component of signal be integrated, described second integral circuit is to described sensor The component of signal that in output, polarity is negative is integrated.
In the present invention, even if the pulsewidth of sensor output signal is very narrow, but because the signal that can be also positive to polarity divides The component of signal that amount and polarity are negative is integrated respectively, thus amplitude variations are converted to area change, therefore uses simple Structure just can improve apparent gain.
In the present invention, described magnetic sensor element preferably have for using described sensor output signal as differential The multiple coils exporting and exporting.According to this structure, then it is difficult to be affected by external disturbance.
And in order to solve above-mentioned second technical problem, the magnetic pattern detecting apparatus of the present invention include detecting from medium The magnetic sensor element of magnetic characteristic and make the connecting gear that described medium moves with respect to this magnetic sensor element, It is characterized in that, described magnetic sensor element arranges multiple, general on the column direction orthogonal with the moving direction of described medium The translational speed of the described medium being transmitted by described connecting gear is set to v (mm/ μ s), and described magnetic sensor element exists Size on described moving direction is set to t (mm), and time per unit ta (μ s) is in the column direction to described magnetic sensor The scanning times that element is scanned are set to n time, then described translational speed v, described unit interval ta, described size t and institute State scanning times n and meet relationship below:
(v×ta)≤(t×n)
In formula, n is more than 2 integer.
In the present invention, due to translational speed v of medium, magnetic sensor element size t in the direction of movement, per unit The scanning times n that time ta is scanned to magnetic sensor element in a column direction is set to meet above-mentioned relation formula, because This, magnetic sensor element region residing in the on-state and magnetic sensor element when next time scanning during present scan Gap will not be produced in the on-state between residing region.Thus, even with to the multiple magnetic arranging along column direction Property sensor element is scanned and makes the mode that medium moves with respect to magnetic sensor, also can be reliably from medium All surfaces detect magnetic pattern.
In the present invention, following structure can be adopted: described unit interval ta is used to detect a row magnetic of described medium During one of pattern scanning, the scanning institute that carries out in being passed through during one scanning based on described magnetic sensor element The data obtaining, detects a row magnetic pattern of described medium.That is, during a scanning in order to detect a row magnetic pattern In take multiple scan.Therefore, it is possible to adopt the structure based on the Data Detection one row magnetic pattern obtained by Multiple-Scan, if Using this structure, even the then situation containing impacts such as noises in any one data obtained by magnetic sensor element Down it is also possible to relax the produced impact of above-mentioned noise.
In the present invention, following structure can be adopted: pass through in one sweep time based on described magnetic sensor element Between in single pass in carry out n time scanning or the data obtained by Multiple-Scan, detect a row magnetic chart of described medium Case.According to this structure, then can be according to accuracy of detection required by the species of medium and magnetic pattern detecting apparatus etc. Realize optimal action.
In present invention, it is preferable to be passed through during one scanning based on described magnetic sensor element in the n that carries out The data obtained by Multiple-Scan in secondary scanning, detects a row magnetic pattern of described medium.According to this structure, then can Enough magnetic characteristics accurately detecting medium.And, even in any one data obtained by magnetic sensor element It is also possible to relax the impact of above-mentioned noise in the case of affecting containing noise etc..
In the present invention, following structure can be adopted: pass through in one sweep time based on described magnetic sensor element Between in all data obtained by carry out n time scanning, detect a row magnetic pattern of described medium.According to this structure, Then because, when present scan and scanning next time, equimultiple view field on medium for the magnetic sensor element overlaps, Therefore, it is possible to accurately detect the magnetic characteristic of medium.And, even any one obtained by magnetic sensor element It is also possible to relax the impact of above-mentioned noise in the case of affecting containing noise etc. in data.
It is also possible in scanning in being passed through during a scanning based on magnetic sensor element in the present invention carry out n time A part scanning obtained by data, detection medium a row magnetic pattern.
For example, it is also possible to adopt following structure: passed through during one scanning based on described magnetic sensor element In meet in carry out n time scanning following condition twice less than the multiple data obtained by the scanning of n time, detection institute Give an account of a row magnetic pattern of matter, this condition is: when present scan and next time scanning, described magnetic sensor element is described Equimultiple view field on medium overlaps on described moving direction；Or when present scan and next time scanning, institute State magnetic sensor element equimultiple view field on media described not overlap on described moving direction but continuous.
In this case it is preferable to carry out in being passed through during one scanning based on described magnetic sensor element N time scanning in meet following condition twice less than n time scanning obtained by multiple data, detection described medium A row magnetic pattern, this condition is: present scan and next time scan when, described magnetic sensor element is on media described Equimultiple view field overlap on described moving direction.According to this structure, then due to present scan and next During secondary scanning, equimultiple view field on medium for the magnetic sensor element overlaps, therefore, it is possible to accurately detect Go out the magnetic characteristic of medium.And, even containing the impact such as noise in any one data obtained by magnetic sensor element In the case of it is also possible to relax above-mentioned noise impact.
In addition, when sensor detection range on described moving direction for the described magnetic sensor element is more than described magnetic During size t on described moving direction for the sensor element, it would however also be possible to employ following structure: based on described magnetic sensor element By meeting the scanning less than n time twice of following condition in scanning in during one scanning carry out n time Obtained multiple data, detect a row magnetic pattern of described medium, this condition is: when present scan and next time scanning, Described sensor detection range overlaps on described moving direction；Or it is when present scan and next time scanning, described Sensor detection range does not overlap but continuous on described moving direction.
In this case it is preferable to carry out in being passed through during one scanning based on described magnetic sensor element N time scanning in meet following condition twice less than n time scanning obtained by multiple data, detection described medium A row magnetic pattern, this condition is: present scan and next time scan when, described sensor detection range is in described movement side Overlap upwards.According to this structure, then because, when present scan and scanning next time, sensor detection range has portion Divide overlap, therefore, it is possible to accurately detect the magnetic characteristic of medium.And, even obtained by magnetic sensor element It is also possible to relax the impact of above-mentioned noise in the case of affecting containing noise etc. in any one data.
In present invention, it is preferable to being obtained many in based on described magnetic sensor element during one scanning Individual data come to detect described medium a row magnetic pattern when, process is averaged to the plurality of data.According to this Structure, even then in the case of the row magnetic pattern going out medium according to multiple Data Detection, as long as also carry out simple Process.And, if process is averaged to multiple data, even arbitrary obtained by magnetic sensor element It is also possible to relax the impact of above-mentioned noise in the case of affecting containing noise etc. in individual data.
In the present invention, scan for n time carried out in being passed through during one scanning based on described magnetic sensor element In any single pass when obtained data be preferably come the row magnetic pattern to detect described medium variable.According to this Plant structure, then can be realized according to accuracy of detection required by the species of medium and magnetic pattern detecting apparatus etc. most preferably dynamic Make.
In the present invention, when described magnetic sensor element carries out excitation output signal by excitation signal, described excitation The frequency that signal has is preferably such that the signal that described in single pass, multiple magnetic sensor element each export comprises by many The component of signal that the described excitation signal in individual cycle is constituted.According to this structure, then because magnetic multiple in single pass pass The signal that sensor component each exports all comprises the component of signal being made up of the excitation signal in multiple cycles respectively, therefore, it is possible to height Detect to precision the magnetic characteristic of medium.
In the magnetic pattern detecting apparatus of Section 1 invention, with amplifier, sensor output signal is being amplified When, due to using the reference voltage changing in linkage with excitation signal, therefore from signal and the base of magnetic sensor output Quasi- difference in voltage is less.Thus, even if not adding the circuit that bridge circuit etc. can lead to cost to increase, amplifier also can be improved Gain, and s/n ratio can be improved.Being additionally, since reference voltage is to change in linkage with excitation signal, so sensor output Signal and reference voltage are synchronous, therefore, it is possible to suitably be amplified to sensor output signal.
In addition, in the magnetic pattern detecting apparatus of another embodiment of Section 1 invention, due to signal processing part bag Include first integral circuit and second integral circuit, wherein, the signal that first integral circuit is positive to polarity in sensor output divides Amount is integrated, and the component of signal that second integral circuit is negative to polarity in sensor output is integrated, therefore, even It is also possible to polarity be positive component of signal and signal that polarity is negative divides in the case that the pulsewidth of sensor output signal is narrower Amount is integrated, respectively thus amplitude variations are converted to area change.Thus, just can improve apparent increasing with simple structure Benefit.
And in the magnetic pattern detecting apparatus of Section 2 invention, due to translational speed v, the magnetic sensor element of medium The scanning times n that size in the direction of movement, time per unit ta are scanned to magnetic sensor element in a column direction It is set to meet relationship below:
(v×ta)≤(t×n)
In formula, n is more than 2 integer,
Therefore, magnetic sensor element region residing in the on-state and magnetic when next time scanning during present scan Sensor element will not produce gap between region residing in the on-state.Thus, arrange even with to along column direction Multiple magnetic sensor element of row are scanned and make the mode that medium moves with respect to magnetic sensor, also can Detect magnetic pattern by ground from all surfaces of medium.
Brief description
Fig. 1 is the magnetic pattern detecting apparatus with magnetic sensor device representing first embodiment of the invention 1 The explanatory diagram of structure.
Fig. 2 is the explanatory diagram of the magnetic sensor device of first embodiment of the invention 1.
Fig. 3 be first embodiment of the invention 1 magnetic sensor device used in magnetic sensor element explanation Figure.
Fig. 4 is the block diagram of the electric structure of the magnetic pattern detecting apparatus representing first embodiment of the invention 1.
Fig. 5 be the magnetic pattern detecting apparatus of first embodiment of the invention 1 enlarging section in be input to the letter of amplifier The explanatory diagram of number grade.
Fig. 6 is to the various magnetic being formed on medium in the magnetic pattern detecting apparatus represent first embodiment of the invention 1 The explanatory diagram of the characteristic of property ink etc..
Fig. 7 is from being formed with different types of magnetic in the magnetic pattern detecting apparatus represent first embodiment of the invention 1 The explanatory diagram that there is the principle of magnetic pattern is detected whether in the medium of property pattern.
Fig. 8 is the enlarging section periphery in the circuit portion of the magnetic pattern detecting apparatus representing first embodiment of the invention 2 The explanatory diagram of structure.
Fig. 9 is the explanatory diagram of the enlarging section structure of the magnetic pattern detecting apparatus representing first embodiment of the invention 3.
Figure 10 is the explanation of the enlarging section peripheral structure of the magnetic pattern detecting apparatus representing first embodiment of the invention 4 Figure.
Figure 11 is the skew adjustment portion peripheral structure of the magnetic pattern detecting apparatus representing first embodiment of the invention 5 Explanatory diagram.
Figure 12 be first embodiment of the invention 6 magnetic pattern detecting apparatus used in the saying of magnetic sensor element Bright figure.
Figure 13 is the explanatory diagram of the electric structure of the magnetic pattern detecting apparatus representing second embodiment of the invention 1.
Figure 14 is the explanatory diagram of the scanning motion of the magnetic pattern detecting apparatus representing second embodiment of the invention 1 etc..
Figure 15 is saying of the operation condition in circuit portion of the magnetic pattern detecting apparatus representing second embodiment of the invention 1 Bright figure.
Figure 16 is the magnetic sensor element of the magnetic pattern detecting apparatus representing second embodiment of the invention 2 each The explanatory diagram of the position being located during scanning.
Figure 17 is the magnetic sensor element of the magnetic pattern detecting apparatus representing second embodiment of the invention 3 each The position being located during scanning and its explanatory diagram of sensor detection range.
Figure 18 is the explanatory diagram of conventional magnetic pattern detecting apparatus.
Label declaration
1 medium
11 medium mobile routes
20 magnetic sensor devices
40 magnetic sensor element
48 magnet exciting coils
49 detection coils
60 signal processing parts
70 enlarging sections
71 amplifiers
72 reference voltage generating units
73 cr differential circuits
74 illusory magnetic sensor element
83 skew adjustment portions
100 magnetic pattern detecting apparatus
835 first integral circuit
836 second integral circuit
Specific embodiment
[first embodiment]
Referring to the drawings, the first embodiment of the present invention is described.First embodiment is that Section 1 invention is illustrated Embodiment.
[first embodiment 1]
(overall structure)
Fig. 1 is the magnetic pattern detecting apparatus with magnetic sensor device representing first embodiment of the invention 1 The explanatory diagram of structure, Fig. 1 (a) is the explanatory diagram of the primary structure showing schematically magnetic pattern detecting apparatus, and Fig. 1 (b) is to show Meaning ground represents the explanatory diagram of cross section structure.
Magnetic pattern detecting apparatus 100 shown in Fig. 1 be from the media such as bank money, marketable securities 1 detection magnetic with The device distinguishing the true from the false with species, has and makes the medium 1 of sheet along medium mobile route using roller, guiding piece (not shown) etc. Conveyer 10 that 11 move and in the half-way of the medium mobile route 11 being transmitted by this conveyer 10 The magnetic sensor device 20 of magnetic is detected from medium 1.In present embodiment, roller, guiding piece are by non-magnetic such as aluminium Property material constitute.In present embodiment, magnetic sensor device 20 is arranged on the lower section of medium mobile route 11, but sometimes also sets Put above medium mobile route 11.No matter being any situation, magnetic sensor device 20 is arranged to so that sensor Face 21 is towards medium mobile route 11.
In present embodiment, for medium 1, in magnetic regions 1a of the narrower width extending along the moving direction x of medium 1 The magnetic pattern that middle presence is formed with magnetic ink, described magnetic pattern is by different many of residual magnetic flux density br and magnetic permeability μ Plant magnetic ink to be formed.For example, in medium 1, it is formed with the first magnetic using the magnetic ink printing containing hard magnetic material Property pattern and using containing soft magnetic materials magnetic ink printing the second magnetic pattern.Therefore, the magnetic of present embodiment Pattern detection device 100 detects according to both residual magnetic flux density value and magnetic conductivity value in medium 1 and whether there is respectively Magnetic pattern.In addition, in present embodiment, the magnetic sensor device 20 for being detected to described two magnetic patterns is Shared.Thus, the magnetic pattern detecting apparatus 100 of present embodiment have following structure.
(structure of magnetic sensor device 20)
Fig. 2 is the explanatory diagram of the magnetic sensor device 20 of first embodiment of the invention 1, and Fig. 2 (a) is to represent that magnetic passes The explanatory diagram of the layout of the magnetic sensor element in sensor arrangement 20 etc., Fig. 2 (b) is the direction representing magnetic sensor element Explanatory diagram.
As shown in Fig. 1 and Fig. 2 (a), in the magnetic pattern detecting apparatus 100 of present embodiment, magnetic sensor device 20 Including: to medium 1 apply magnetic field magnetic field applying magnet 30, detect to be applied with the medium behind magnetic field 1 apply bias magnetic field In the state of the magnetic sensor element 40 of magnetic flux and cover magnetic field apply non-with magnet 30 and magnetic sensor element 40 Magnetic shell 25.Magnetic sensor device 20 includes: with medium mobile route 11 constitute substantially conplane sensor cover 21, And the inclined plane part 22,23 that the both sides of the moving direction in medium 1 are connected with this sensor cover 21 with respect to sensor cover 21, its shape Shape is by the shape defined of shell 25.
The side that magnetic sensor device 20 intersects in the moving direction x with medium 1 upwardly extends, and magnetic field applies to use magnet 30 With magnetic sensor element 40 be arranged with the direction that the moving direction x with medium 1 intersects multiple.In present embodiment, magnetic The property media width direction orthogonal with moving direction x in the direction that the moving direction x with medium 1 intersects for the sensor device 20 Extend on y, magnetic field applying magnet 30 and magnetic sensor element 40 are in the media width direction y (row orthogonal with moving direction x Direction) on be arranged with multiple, and equally spaced arrange in a column.Therefore, if to the multiple magnetic arranging along media width direction y Property sensor element 40 is scanned so as to become conducting state successively, then be capable of detecting when medium 1 in media width direction y On magnetic pattern.If in addition, concurrently making medium 1 move on moving direction x with above-mentioned scanning, being capable of detecting when medium 1 whole magnetic patterns.In addition, " conducting state " mentioned here, refer to magnetic sensor element 40 is applied described hereinafter Excitation signal and the state of activation of signal transacting is carried out to the signal of magnetic sensor element 40 output.
In present embodiment, magnetic field applying magnet 30 is arranged on the movement of medium 1 with respect to magnetic sensor element 40 The both sides of direction x, apply to be applied with the second magnet 32 with the first magnet 31 and magnetic field as magnetic field, along the medium shown in arrow x1 1 moving direction, is disposed with magnetic field and applies to apply to use the second magnetic with the first magnet 31, magnetic sensor element 40 and magnetic field Body 32.And the moving direction of the medium 1 shown in along arrow x2, it is disposed with magnetic field and apply with the second magnet 32, magnetic transducing Device element 40 and magnetic field apply to use the first magnet 31, no matter medium 1 is the direction movement shown in along arrow x1 or along arrow x2 Shown direction is moved, and can detect the magnetic characteristic of medium 1.Here, magnetic sensor element 40 is arranged on magnetic field and applies to use First magnet 31 and magnetic field apply with, on the centre position between the second magnet 32, magnetic field applies to be passed with the first magnet 31 and magnetic Standoff distance between sensor component 40 is equal to magnetic field and applies with being separated by between the second magnet 32 and magnetic sensor element 40 Distance.Additionally, magnetic field applies to apply to be arranged to the second magnet 32 with the first magnet 31, magnetic sensor element 40 and magnetic field Opposite with the sensor cover 21 of magnetic sensor device 20.
In present embodiment, with magnet 30, (magnetic field applies to apply to use the second magnetic with the first magnet 31 and magnetic field for magnetic field applying Body 32) possess the permanent magnets 35 such as ferrite, neodymium magnet.No matter being that magnetic field applies to apply to use second with the first magnet 31 or magnetic field Magnet 32, the side positioned at sensor cover 21 of permanent magnet 35 and the side contrary with sensor cover 21 side are all by magnetic It is melted into different magnetic poles.Therefore, the surface positioned at sensor cover 21 side of permanent magnet 35 is played and is magnetized as to medium 1 Magnetizing surface 350 effect.That is, in the magnetic pattern detecting apparatus 100 of present embodiment, as described later, when as arrow x1 As shown in movement medium 1 pass through magnetic sensor device 20 when, first, from magnetic field apply with the first magnet 31 to medium 1 Apply magnetic field, the medium 1 after being magnetized by described magnetic field passes through magnetic sensor element 40 again.And when shifting as shown in arrow x2 When dynamic medium 1 passes through magnetic sensor device 20, first, apply to apply magnetic field, quilt with the second magnet 32 to medium 1 from magnetic field Medium 1 after the magnetization of described magnetic field passes through magnetic sensor element 40 again.
Used in magnetic field applying magnet 30, multiple permanent magnets 35 all have same size and same shape, but set respectively It is set to the following direction of magnetization.First, no matter being magnetic field applying the first magnet 31 or magnetic field applying the second magnet 32, The contrary side of the upper adjacent permanent magnet 35 all towards each other of media width direction (column direction) y orthogonal with the moving direction x of medium 1 To magnetization.That is, in multiple permanent magnets 35 of arrangement on the orthogonal media width direction y of the moving direction x with medium 1, wherein The end positioned at medium mobile route 11 side of one permanent magnet 35 is magnetized into n pole, positioned at medium mobile route 11 side The end of contrary side is magnetized into s pole, and on the orthogonal media width direction y of the moving direction x with medium 1 with this permanent magnetism The adjacent permanent magnet of body 35 35, its be located at medium mobile route 11 side end be magnetized into s pole, positioned at medium mobile route The end of the contrary side in 11 sides is magnetized into n pole.Additionally, in present embodiment, for opposite on the moving direction of medium 1 The magnetic field permanent magnet 35 that applies with the permanent magnet 35 of the first magnet 31 and magnetic field applying the second magnet 32, with different magnetic poles Clip magnetic sensor element 40 and opposite.Additionally, applying to use the first magnetic for opposite magnetic field on the moving direction of medium 1 The permanent magnet 35 of body 31 and the magnetic field applying permanent magnet 35 of the second magnet 32, are also configured to clip magnetic with identical magnetic pole sometimes Property sensor element 40 and opposite.
(structure of magnetic sensor element 40)
Fig. 3 be first embodiment of the invention 1 magnetic sensor device 20 used in magnetic sensor element 40 Explanatory diagram, Fig. 3 (a) is the front view of magnetic sensor element 40, and Fig. 3 (b) is the field wave to this magnetic sensor element 40 The explanatory diagram of shape, Fig. 3 (c) is the explanatory diagram of the output signal from magnetic sensor element 40.In Fig. 3 (a), represent medium 1 The state moving 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 more than thickness direction The size of t40.Described magnetic sensor element 40 be arranged to by thickness direction t40 towards medium 1 moving direction x, width side To media width direction (column direction) y that w40 direction is orthogonal with the moving direction x of medium 1.
The thickness that the two sides of magnetic sensor element 40 is formed by pottery etc. in 0.3mm～1.0mm about lamellar Non-magnetic member 47 covered, even non-magnetic member 47 is included together in the thickness side of interior whole magnetic sensor element 40 To thickness size (the size t) constituting magnetic sensor element 40.Described magnetic sensor element 40 is also accommodated in magnetic sometimes In shielding shell (not shown).In this case, the top that the medium mobile route of magnetic screen shell is located carries out opening, magnetic Property sensor element 40 is in the state exposed from magnetic screen shell to medium mobile route 11.
As shown in Fig. 1 (b), Fig. 2 (a), Fig. 2 (b) and Fig. 3 (a), magnetic sensor element 40 include sensor magnetic core 41, The magnet exciting coil 48 being wound in sensor magnetic core 41 and the detection coil 49 being wound in sensor magnetic core 41.In present embodiment, Sensor magnetic core 41 includes the main part 42 extending on the width w40 of magnetic sensor element 40 and from main part 42 The poly- magnetic teat 43 prominent to medium mobile route 11 side of medium 1.Here, poly- magnetic is constituted as from main body with teat 43 The both ends of the width w40 in the portion 42 two poly- magnetic teats 431 prominent to medium mobile route 11 side of medium 1, 432, two poly- magnetic interval on width w40 with teat 431,432.In addition, sensor magnetic core 41 has from main body Portion 42 to the poly- magnetic prominent teat 44 in the contrary side of teat 43, in present embodiment, teat 44 is constituted as from main body Dash forward in the both ends of the width w40 in portion 42 side contrary to medium mobile route 11 side with medium 1 prominent two Portion 441,442.
For the sensor magnetic core 41 using this structure, magnet exciting coil 48 is wound on main part 42 by poly- magnetic with dashing forward The part that portion 431,432 clips.In addition, detection coil 49 is wound in poly- magnetic teat 43, in present embodiment, detection coil 49 include the poly- magnetic teat in two poly- magnetic teats 43 (poly- magnetic teat 431,432) be wound in sensor magnetic core 41 431 detection coil 491 and the detection coil 492 being wound in poly- magnetic teat 432.Here, two detection coils 491,492 It is wound in poly- magnetic teat 431,432 reversely with each otherly.Further, since two detection coils 491,492 are by single line astragal Continuously it is wound in poly- magnetic teat 431,432 and constitutes, therefore two detection coils 491,492 are electrically connected in series.This Outward, also can realize being electrically connected in series after two detection coils 491,492 are wrapped around poly- magnetic teat 431,432 Connect.
It is arranged to prominent with width w40 and poly- magnetic teat 43 using the magnetic sensor element 40 of this structure The orthogonal thickness direction t40 of direction (short transverse v40) both of which is towards the moving direction x of medium 1, magnetic sensor element In 40, the poly- magnetic width of teat 43 (poly- magnetic teat 431,432) and detection coil 49 (detection coil 491,492) interval Degree direction w40 direction media width direction (column direction) y orthogonal with the moving direction x of medium 1.
In magnetic sensor element 40, magnet exciting coil 48 is applied from the excitation that hereinafter will illustrate with reference to Fig. 4 The excitation signal being formed by alternating current (with reference to Fig. 3 (b)) of circuit 50.Therefore, as shown in Fig. 3 (a), in sensor magnetic core 41 Surrounding's formation bias magnetic field, and export the signal of the detection waveform shown in Fig. 3 (c) from detection coil 49.Here, Fig. 3 (c) Shown detection waveform is the time diffusion signal to magnetic flux produced by excitation signal, the time diffusion signal with excitation signal Close.
In present embodiment, such as shown in Fig. 1 (b), the sensor magnetic core 41 of magnetic sensor element 40 is using non magnetic First substrate 41a and nonmagnetic second substrate 41b between clip the structure of magnetic material layer 41c.In present embodiment, magnetic Property material layer 41c is made up of laminal amorphous metal paper tinsel, and this amorphous metal paper tinsel is by the magnetic material of amorphous (noncrystalline) metal Formed, be bonded on a surface of first substrate 41a using adhesive linkage (not shown), second substrate 41b utilizes adhesive linkage And engage with a surface of described first substrate 41a, magnetic material layer 41c is clipped in the middle.Described adhesive linkage be all by Resin material is immersed in the fibre reinforced materials such as glass fibre, carbon fiber, aramid fibre and to the preimpregnation being formed Expect the layer being solidified to form, as resin material, using thermosettings such as epoxy resin, phenolic resin class, polyester resins Change resin.The amorphous metal paper tinsel that magnetic material layer 41c is used is formed by rolling 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, fe-b-si, fe-b- can be enumerated The non-crystaline amorphous metals such as si-c, fe-b-si-cr, fe-co-b-si, fe-ni-mo-b.First substrate 41a and second substrate 41b can lift Go out the ceramic substrates such as aluminum oxide substrate, glass substrate etc., as long as enough rigidity can be obtained, it is possible to use plastic base.
(structure of signal processing part 60)
Fig. 4 is the block diagram 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 explanatory diagram of major part in indication circuit portion, Fig. 4 (b) is the enlarging section periphery knot in indication circuit portion The explanatory diagram of structure.
In present embodiment, Fig. 4 (a) and the circuit portion 5 shown in Fig. 4 (b) generally comprise the alternation electricity shown in Fig. 3 (b) Stream is as the excitation signal field circuit 50 being applied to magnet exciting coil 48 and the signal transacting being electrically connected with detection coil 49 Portion 60.Field circuit 50 includes that corresponding multiple excitation excitation is put respectively with the multiple magnetic sensor element 40 shown in Fig. 2 Big device 51, for providing the multiplexer 52 of excitation signal and according to excitation to multiple excitations with exciting amplifier 51 successively Command signal generates the amplifier 53 of excitation signal, and this field circuit 50 is successively to the excitation wire of multiple magnetic sensor element 40 Circle 48 provides the excitation signal after being exaggerated through excitation exciting amplifier 51.
Signal processing part 60, according to the sensor output signal of detection coil 49 output of magnetic sensor device 20, generates First signal s1 corresponding with residual magnetic flux density value and secondary signal s2 corresponding with magnetic conductivity value, above-mentioned control unit (not shown) is according to the relative position between described first signal s1 and secondary signal s2 and medium 1 and magnetic sensor device 40 Confidence ceases, and whether there is multiple magnetic patterns and its forming position in detection medium 1.
More specifically, signal processing part 60 includes the sensor output signal of magnetic sensor element 40 output is carried out The enlarging section 70 amplified, the extraction unit 80 extracting peak value and valley from the signal of enlarging section 70 output and there is a/d conversion The digital signal processing section 90 of device 91.The signal that amplifies that extraction unit 80 includes exporting amplifier 70 is sequentially output the many of rear class Road converter 81, clamp circuit 82 and the signal to clamp circuit 82 output enter the skew adjustment portion 83 of line displacement adjustment.Clamp Circuit 82 includes carrying out the first diode 821 of rectification, right to the amplified sensor output signal of enlarging section 70 output The amplified sensor output signal of enlarging section 70 output carries out the polarity inversion circuit 822 of polarity inversion and in pole Carried out the second diode 823 that the signal after polarity inversion carries out rectification in sex reversal circuit 822.Thus, offset adjustment portion 83 include the output of the first diode 821 being entered with the first offset adjusting circuit 831 of line displacement adjustment and to the second diode The second offset adjusting circuit 832 of line displacement adjustment, the first offset adjusting circuit 831 and the second skew adjustment are entered in 823 output Circuit 832 includes offseting adjustment reference voltage generating circuit 831a, 832a and operational amplifier 831b, 832b.
In addition, extraction unit 80 is additionally provided with holding circuit 84 in the rear class of skew adjustment portion 83, in the rear class of holding circuit 84 It is additionally provided with gain setting unit 85.Holding circuit 84 includes the peak value of the output signal of the first offset adjusting circuit 831 is protected The first peak holding circuit 841 of holding and the peak value to the output signal of the second offset adjusting circuit 832 kept second Peak holding circuit 842.Here, to the second offset adjusting circuit 832 input be from enlarging section 70 output signal through polarity Carried out the signal after rectification after circuit for reversing 822 has carried out polarity inversion and through the second diode 823.Therefore, the second peak value Holding circuit 842 is equivalent to the valley hold circuit that the valley of the amplification signal exporting enlarging section 70 is kept.
The gain that gain setting unit 85 includes setting the gain of value that the first peak holding circuit 841 is kept sets and uses the One amplifier 851 (main amplifier) and the gain setting the value that the second peak holding circuit 842 (valley hold circuit) is kept Gain set with the second amplifier 852 (main amplifier), this gain setting unit 85 is by the first peak holding circuit 841 and second The value that peak holding circuit 842 is kept is set as the gain specifying, is then output to the a/d conversion of digital signal processing section 90 Device 91.
Digital signal processing section 90 includes add circuit 92 and subtraction circuit 93, and wherein, add circuit 92 is by the first peak value The value that the value that holding circuit 841 is kept is kept with the second peak holding circuit 842 is added, thus generating the first signal s1, The value phase that the value that first peak holding circuit 841 is kept then is kept by subtraction circuit 93 with the second peak holding circuit 842 Subtract, thus generating secondary signal s2.Digital signal processing section 90 also includes output switching control signal, excitation command signal, partially Move the control signal output section 94 of control signal etc..Using said structure digital signal processing section 90 to upper control unit Output (not shown) the first signal s1 and secondary signal s2, in above-mentioned control unit, based on the first signal s1 and secondary signal s2 To judge the true and false of medium 1.More specifically, be provided with detection unit in upper control unit, this detection unit by the first signal s1 and Relative position information between secondary signal s2 and magnetic sensor element 40 and medium 1 is associated, and is previously recorded in record Comparing patternses in portion are compareed, thus judging the true and false of medium 1, described detection unit is based on and is previously recorded in rom or ram etc. The process that program in record portion (not shown) is specified, thus judge the true and false of medium 1.
(detailed construction of enlarging section 70)
Fig. 5 be the magnetic pattern detecting apparatus 100 of first embodiment of the invention 1 enlarging section 70 in be input to amplifier Signal etc. explanatory diagram, Fig. 5 (a) is the explanatory diagram of the waveform representing excitation signal, sensor output signal and reference voltage, 5 (b) is the explanatory diagram representing the waveform after the difference of sensor output signal and reference voltage being exaggerated with enlarging section.Figure In 5 (a) and Fig. 5 (b), represent excitation signal with solid line l1, represent sensor output signal with solid line l2, represent base with solid line l3 Quasi- voltage, represents the letter after the difference of sensor output signal and reference voltage being exaggerated with amplifier with solid line l4 Number.
In the magnetic pattern detecting apparatus 100 of present embodiment, enlarging section 70, as shown in Fig. 4 (b), has and multiple magnetic Sensor element 40 respectively corresponding multiple amplifiers 71 (preamplifier), to described amplifier 71 input reference voltage and from The sensor output signal of magnetic sensor element 40 output.Here, enlarging section 70 is possessed generation and is sent out in linkage with excitation signal The signal of changing is as the reference voltage generating unit 72 of reference voltage, in present embodiment, electric to amplifier 71 input reference The signal that pressure generating unit 72 is generated is as reference voltage.
In present embodiment, reference voltage has in Fig. 5 (a) and Fig. 5 (b) with the waveform shown in solid line l3, this waveform Be equivalent to having carried out the waveform that obtains after differential in Fig. 5 (a) with the excitation signal shown in solid line l1.Therefore, reference voltage meeting Change in linkage with excitation signal.More specifically, in present embodiment, reference voltage generating unit 72 be by electric capacity c and The cr differential circuit 73 of resistance r composition, this cr differential circuit 73 generates signal excitation signal having been carried out obtain after differential and makees On the basis of voltage.Here, be equivalent to excitation with the sensor output signal shown in solid line l2 due in Fig. 5 (a) and Fig. 5 (b) The time diffusion of magnetic flux produced by signal, therefore, the reference voltage that excitation signal is carried out obtaining after differential is defeated with sensor Go out signal synchronous.If said reference voltage, then as shown in Fig. 5 (b), due to the difference of this reference voltage and sensor output signal Less, therefore, even if improving the gain of amplifier 71, the output signal of amplifier 71 is also not up to saturation, but as Fig. 5 Use shown in solid line l4 in (b).
(Cleaning Principle)
Fig. 6 is each to formed on medium 1 in the magnetic pattern detecting apparatus 100 represent first embodiment of the invention 1 Plant the explanatory diagram of the characteristic of magnetic ink etc..Fig. 7 is the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 1 In detect whether the explanatory diagram that there is the principle of magnetic pattern from the medium 1 being formed with different types of magnetic pattern.
First, illustrate medium 1 along Fig. 1 and Fig. 2 shown in arrow x1 direction mobile when judge medium 1 the true and false former Reason.In present embodiment, in magnetic regions 1a of medium 1, it is formed with residual magnetic flux density br and different multiple of magnetic permeability μ Magnetic pattern.More specifically, in medium 1, it is formed with the first magnetic using the magnetic ink printing containing hard magnetic material Property pattern and using containing soft magnetic materials magnetic ink printing the second magnetic pattern.Here, the magnetic containing hard magnetic material Ink as in Fig. 6 (b1) using residual magnetic flux density br shown in hysteresis curve and magnetic permeability μ etc., after being applied with magnetic field The value of residual magnetic flux density br is higher, but magnetic permeability μ is relatively low.In contrast to this, such as Fig. 6 of the magnetic ink containing soft magnetic materials (c1), in shown in its hysteresis curve, the value being applied with residual magnetic flux density br behind magnetic field is relatively low, but magnetic permeability μ is higher.
Thus, as will be explained below, as long as measuring residual magnetic flux density br and magnetic permeability μ, magnetic just can be differentiated The material of ink.More specifically, because magnetic permeability μ is related to coercivity hc, therefore in present embodiment, just measure remanence The ratio of flux density br and coercivity hc, described residual magnetic flux density br and coercivity hc is because of the difference of magnetic ink (magnetic material) And it is different.Thus, it is possible to differentiate the material of magnetic ink.In addition, though residual magnetic flux density br and magnetic permeability μ (coercivity hc) Measured value can change because of the distance between the deep or light, medium 1 of ink and magnetic sensor device 20, but this embodiment party In formula, because magnetic sensor device 20 is to measure residual magnetic flux density br and magnetic permeability μ (coercivity hc) in same position, because This, according to the ratio of residual magnetic flux density br and coercivity hc, can reliably differentiate the material of magnetic ink.
In the magnetic pattern detecting apparatus 100 of present embodiment, medium 1 along arrow x1 shown in direction mobile and pass through During magnetic sensor device 20, first, apply to apply magnetic field with the first magnet 31 to medium 1 from magnetic field, after being applied in magnetic field Medium 1 pass through magnetic sensor element 40.Interior during this period, such as shown in Fig. 6 (a3), from the inspection of magnetic sensor element 40 Test coil 49 exports the corresponding signal of b-h curve with the sensor magnetic core 41 shown in Fig. 6 (a2).Thus, from shown in Fig. 4 First signal s1 of add circuit 92 output and secondary signal s2 from subtraction circuit 93 output are respectively as shown in Fig. 6 (a4) Like that.
Here, if forming the first magnetic pattern using the magnetic ink containing hard magnetic materials such as ferrite powders on medium 1, Shown in described first magnetic pattern such as Fig. 6 (b1), there is residual magnetic flux density br of high magnitude.Therefore, as shown in Fig. 7 (a1), When medium 1 has passed through magnetic field applying magnet 30, the first magnetic pattern forms because of the magnetic field carrying out self-magnetic field applying magnet 30 For magnet.Therefore, from shown in the signal such as Fig. 6 (b2) of detection coil 49 output of magnetic sensor element 40, because of the first magnetic Pattern is subject to direct current biasing, becomes the waveform shown in Fig. 6 (b3) and Fig. 7 (a2).That is, the crest voltage of signal s0 and valley point voltage As shown in arrow a1, a2, offset in the same direction, and the side-play amount of crest voltage is different with the side-play amount of valley point voltage.And And, described signal s0 changes with moving of medium 1.Thus, the first letter of add circuit 92 output shown in from Fig. 4 Shown in number s1 such as Fig. 6 (b4), just change when the first magnetic pattern of medium 1 passes through magnetic sensor element 40.This In, the magnetic permeability μ of the first magnetic pattern due to being formed by the magnetic ink containing hard magnetic material is relatively low, therefore affects signal s0's The skew of crest voltage and valley point voltage, can be considered residual magnetic flux density br of the only first magnetic pattern.Thus, even if being situated between First magnetic pattern of matter 1 passes through magnetic sensor element 40, secondary signal s2 of subtraction circuit 93 output shown in from Fig. 4 Will not change, identical with the signal shown in Fig. 6 (b4).
In contrast to this, if forming the on medium using the magnetic ink of the soft magnetic materials such as stainless steel powder containing soft magnetism Two magnetic patterns are then shown in the hysteresis curve such as Fig. 6 (c1) of described second magnetic pattern, hard by containing shown in through Fig. 6 (b1) The inner side of the B-H loop of the first magnetic pattern that the magnetic ink of magnetic material is formed, the value of residual magnetic flux density br is relatively Low.Therefore, even if medium 1 is applied with, after magnet 30, the value of residual magnetic flux density br of the second magnetic pattern is still by magnetic field So relatively low.But, because the magnetic permeability μ of the second magnetic pattern is higher, therefore as shown in Fig. 7 (b1), play as magnetic Effect.Therefore, from shown in the signal such as Fig. 6 (c2) of detection coil 49 output of magnetic sensor element 40, due to the second magnetic The presence of pattern, thus magnetic permeability μ becomes big, correspondingly becomes the waveform shown in Fig. 6 (c3) and Fig. 7 (b2).That is, signal s0 Crest voltage as shown by an arrow a3 towards the skew of higher side, and valley point voltage then as shown in arrow a4 towards a relatively low lateral deviation Move.Now, its absolute value of the side-play amount of the side-play amount of crest voltage and valley point voltage is roughly equal.And, described signal s0 with Moving and changing of medium 1.Thus, secondary signal s2 such as Fig. 6 (c4) institute of subtraction circuit 93 output shown in from Fig. 4 Show, just change when the second magnetic pattern of medium 1 passes through magnetic sensor element 40.Here, due to by containing soft magnetism Residual magnetic flux density br of the second magnetic pattern that the magnetic ink of material is formed is relatively low, the therefore crest voltage to signal and paddy The skew of threshold voltage produces impact, can be considered the magnetic permeability μ of the only second magnetic pattern.Thus, even if the second magnetic of medium 1 Property pattern pass through magnetic sensor element 40, shown in from Fig. 4 add circuit 92 output the first signal s1 also do not change, Identical with the signal shown in Fig. 6 (c4).
Thus, in the magnetic pattern detecting apparatus 100 of present embodiment, will be from magnetic sensor element with add circuit 92 The first signal s1 that the peak value of the signal of 40 outputs obtains after being added with valley is the residual magnetic flux density with magnetic pattern The corresponding signal of value, if monitoring described first signal s1, can detect whether exist by the magnetic ink containing hard magnetic material The first magnetic pattern and its forming position that water is formed.And use the signal that subtraction circuit 93 will export from magnetic sensor element 40 Peak value and valley subtract each other after secondary signal s2 that obtains be the signal corresponding with the magnetic permeability μ of magnetic pattern, if monitoring institute State secondary signal s2, then can detect whether there is the second magnetic pattern being formed by the magnetic ink containing soft magnetic materials and its shape Become position.Thus, can be identified according to both residual magnetic flux density value and magnetic conductivity value to whether there is in medium 1 and apply Plus residual magnetic flux density br and the different each magnetic pattern of multiple magnetic patterns of magnetic permeability μ and its forming position behind magnetic field.
(main efficacy results of first embodiment 1)
As described above, in the enlarging section 70 of the signal processing part 60 of the magnetic pattern detecting apparatus 100 of present embodiment, Whenever will be exported to amplifier 71 input reference voltage and by the magnetic sensor element 40 that excitation signal has carried out excitation During sensor output signal, just generate, in reference voltage generating unit 72, the signal changing in linkage with excitation signal, and will Described signal is as reference voltage input amplifier 71.Therefore, reference voltage and the sensing from magnetic sensor element 40 output The difference of device output signal is less.Thus, even if not adding the circuit that bridge circuit etc. can lead to cost to increase, amplification also can be improved The gain of device 71, and s/n ratio can be improved.Being additionally, since reference voltage is to change in linkage with excitation signal, so sensing Device output signal and reference voltage are synchronous, therefore, it is possible to suitably be amplified to sensor output signal.
Further, since reference voltage generating unit 72 generates the letter with the waveform that excitation signal has been carried out obtaining after differential Number it is used as reference voltage, therefore, it is possible to reduce the difference of sensor output signal and reference voltage.That is, because sensor exports letter Number be equivalent to the time diffusion to magnetic flux produced by excitation signal, if therefore using having carried out obtaining after differential to excitation signal Waveform signal as amplifier 71 reference voltage, then sensor output signal is less with the difference of reference voltage, so as to Enough improve gain.
Further, since reference voltage generating unit 72 has carries out differential to excitation signal thus the cr generating reference voltage is micro- Parallel circuit 73, therefore using the such as inexpensive electronic component of electric capacity c, resistance r etc, just can carry out differential to excitation signal thus Generate reference voltage.
In addition, in the magnetic pattern detecting apparatus 100 of present embodiment, due to being to share magnetic sensor device 20, root To detect whether there is each magnetic pattern and its forming position according to both residual magnetic flux density value and magnetic conductivity value, therefore Between the mensure and the mensure of magnetic conductivity value of residual magnetic flux density value will not generation time poor.Thus, even one While in the case of making magnetic sensor device 20 and medium 1 mobile while measuring, signal processing part 60 also can be with simple Structure carries out high-precision detection.In addition, for conveyer 10, also only passing through the position of magnetic sensor device 20 at it On require operation stability, therefore can try hard to simplify structure.
And, according to the magnetic pattern detecting apparatus 100 of present embodiment, for using containing hard magnetic material and soft magnetic materials The magnetic ink of both is formed with the medium 1 of magnetic pattern or using containing positioned at the centre of hard magnetic material and soft magnetic materials The magnetic ink of material is formed with the medium 1 of magnetic pattern, also can carry out the detection of magnetic pattern.That is, magnetic characteristic is located at Magnetic pattern as the centre of the first magnetic pattern and the second magnetic pattern, such as shown in Fig. 6 (d1), because hysteresis curve is located at The hysteresis curve of the magnetic pattern of hard magnetic material shown in Fig. 6 (b1) and the magnetic pattern of soft magnetic materials shown in Fig. 6 (c1) The centre of hysteresis curve, therefore can get the signal pattern shown in Fig. 6 (d4), for described magnetic pattern, also can detect it Whether there is and its forming position.
And, in the magnetic sensor device 20 of present embodiment, applying magnet 30 in magnetic field is with respect to magnetic sensor The both sides of the moving direction in medium 1 for the element 40 are provided as magnetic field and apply to apply to use the second magnet with the first magnet 31 and magnetic field 32.Therefore, as shown in figure 1, applying with the first magnet 31, the medium 1 of the direction movement shown in along arrow x1 to be carried out using magnetic field Magnetization, afterwards, using magnetic sensor element 40, in the state of being capable of detecting when to apply bias magnetic field to the medium 1 after magnetization Magnetic flux, and apply with the second magnet 32, the medium 1 of the direction movement shown in along arrow x2 to be magnetized using magnetic field, it Afterwards, using magnetic sensor element 40, it is capable of detecting when to apply the magnetic flux in the state of bias magnetic field to the medium 1 after magnetization. Thus, if the magnetic pattern detecting apparatus 100 of present embodiment are used for automatic teller machine, can determine that be stored in medium 1 The true and false, and also can determine that the true and false of medium 1 to be taken out.
[first embodiment 2]
Fig. 8 is the enlarging section 70 in the circuit portion of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 2 The explanatory diagram of peripheral structure.Further, since the basic structure of present embodiment is identical with embodiment 1, therefore for common Partly additional identical label, and the description thereof will be omitted.
In first embodiment 1, enlarging section 70 is provided with multiple put corresponding respectively with multiple magnetic sensor element 40 Big device 71, but in the present embodiment, as shown in figure 8, the rear class in multiple magnetic sensor element 40 arranges multiplexer 77, and the rear class in multiplexer 77 arranges amplifier 71.Therefore, from the sensor of multiple magnetic sensor element 40 output Output signal is sequentially output amplifier 71 by multiplexer 77.Therefore, if with an amplifier 71 just can to from The sensor output signal of multiple magnetic sensor element 40 outputs is amplified.
In addition, present embodiment is also identical with first embodiment 1, in enlarging section 70, it is provided with cr differential circuit 73 Reference voltage generating unit 72 generates the signal changing in linkage with excitation signal, and will be defeated as reference voltage for described signal Enter to amplifier 71.Therefore, because the difference of reference voltage and the sensor output signal from magnetic sensor element 40 output is relatively Little, even if thus not adding the circuit that bridge circuit etc. can lead to cost to raise, gain of amplifier 71 etc. also can be improved, can Realize such and embodiment 1 identical effect.
In addition, in first embodiment 1, being provided with and multiple magnetic sensor element 40 corresponding multiple excitation use respectively Exciting amplifier 51, but in the present embodiment, in excitation, multiplexer 54 is set with the rear class of exciting amplifier 51, and The rear class of multiplexer 54 arranges multiple magnetic sensor element 40.Therefore, encouraging from excitation exciting amplifier 51 output Magnetic signal is sequentially output multiple magnetic sensor element 40 by multiplexer 54.Thus, as long as being used with an excitation Exciting amplifier 51 just can provide excitation signal to multiple magnetic sensor element 40.
Additionally, in order that this unwanted signal when multiplexer 77 switches over, for example with multiplexer 77 During change detection signal, produced noise etc. will not enter rear class it is also possible to carry out micro- to the switching sequence of multiplexer 77 Adjust but it is also possible to as shown in figure 8, the output stage in amplifier 71 adds analog switch 79, so that after noise etc. will not enter Level.
[first embodiment 3]
Fig. 9 is saying of the structure of enlarging section 70 of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 3 Bright figure, Fig. 9 (a) is the explanatory diagram of the peripheral structure representing enlarging section 70, and Fig. 9 (b) is the explanation of illusory magnetic sensor element Figure.Further, since the basic structure of present embodiment is identical with first embodiment 1,2, therefore common is partly added Identical label, and the description thereof will be omitted.
In first embodiment 1,2, employ the reference voltage generating unit 72 with cr differential circuit 73, but in this reality Apply in mode, such as shown in Fig. 9 (a), be provided that the reference voltage generating unit 72 with illusory magnetic sensor element 74.From And, using illusory magnetic sensor element 74, the signal changing in linkage with excitation signal can be generated, and by described letter Number it is input to amplifier 71 as reference voltage.Here, illusory magnetic sensor element 74 is located off the medium shown in Fig. 1 On the position of mobile route 11, thus not being subject to the magnetic influence from medium 1 and magnetic sensor element 40.
Above-mentioned illusory magnetic sensor element 74, as shown in Fig. 9 (b), has and is said with reference to Fig. 2 (b) and Fig. 3 (b) Bright magnetic sensor element 40 identical structure, has winding magnet exciting coil 48 and detection coil 49 on sensor magnetic core 41 Construction.In addition, being carried to the magnet exciting coil 48 of illusory magnetic sensor element 74 by illusory excitation exciting amplifier 510 For excitation signal, and the output of the detection coil 49 of illusory magnetic sensor element 74 is supplied to amplifier as reference voltage 71.
Using in the enlarging section 70 of this structure, illusory magnetic sensor element 74 carries out excitation by excitation signal, and will Excitation signal is carried out with signal obtained from differential export from detection coil 49.Here, illusory magnetic sensor element 74 is defeated Go out signal and be equivalent to time diffusion to magnetic flux produced by excitation signal, be ripple excitation signal having been carried out obtain after differential The signal of shape.Therefore, because reference voltage can be made minimum with the difference of sensor output signal such that it is able to improve gain.
Additionally, in present embodiment, being provided with the basis of first embodiment 2 and there is illusory magnetic sensor element 74 reference voltage generating unit 72 has illusory magnetic sensor element 74 but it is also possible to arrange on the basis of embodiment 1 Reference voltage generating unit 72.
[first embodiment 4]
Figure 10 is the periphery knot of the enlarging section 70 of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 4 The explanatory diagram of structure.Further, since the basic structure of present embodiment is identical with first embodiment 1～3, therefore for common Partly additional identical label, and the description thereof will be omitted.
In first embodiment 1～3, it is provided with skew adjustment portion 83 in the rear class of clamp circuit 82, but in this embodiment party In formula, as shown in Figure 10, the operational amplifier 831b and second in skew adjustment portion 83, to the first offset adjusting circuit 831 Operational amplifier 832b setting electric capacity, the first offset adjusting circuit 831 and second offset adjusting circuit of offset adjusting circuit 832 832 respectively constitute as first integral circuit 835 and second integral circuit 836.
Therefore, first integral circuit 835 is that positive component of signal is carried out to the polarity from the signal that amplifier 71 exports Integration, and the component of signal that second integral circuit 836 is then negative to polarity therein is integrated.Thus, even if from amplifier The pulsewidth of the signals of 71 outputs is very narrow, but the component of signal due to also to polarity can be positive component of signal and polarity is negative is divided It is not integrated, thus amplitude variations are converted to area change, therefore just can improve apparent gain with simple structure.
In addition, present embodiment is also identical with first embodiment 1, in enlarging section 70, it is provided with cr differential circuit 73 Reference voltage generating unit 72 generates the signal changing in linkage with excitation signal, and will be defeated as reference voltage for described signal Enter to amplifier 71.Therefore, because the difference of reference voltage and the sensor output signal from magnetic sensor element 40 output is relatively Little, even if thus not adding the circuit that bridge circuit etc. can lead to cost to raise, gain of amplifier 71 etc. also can be improved, can Realize such and embodiment 1 identical effect.
Additionally, present embodiment employs the structure arranging integrating circuit on the basis of first embodiment 1, but also may be used Using the structure arranging integrating circuit in first embodiment 2,3.
[first embodiment 5]
Figure 11 is the week of the skew adjustment portion 83 of the magnetic pattern detecting apparatus 100 representing first embodiment of the invention 5 The explanatory diagram of side structure.Further, since the basic structure of present embodiment is identical with first embodiment 1～4, therefore for altogether Same partly additional identical label, and the description thereof will be omitted.
In first embodiment 1～4, enlarging section 70 is provided with reference voltage generating unit 72, but in present embodiment In, as shown in figure 11, in enlarging section 70 and be not provided with reference voltage generating unit 72, and the reference voltage of amplifier 71 is ground connection The fixed potentials such as current potential.
But, present embodiment is identical with first embodiment 4, in skew adjustment portion 83, to the first skew adjustment electricity The operational amplifier 832b setting electric capacity of the operational amplifier 831b on road 831 and the second offset adjusting circuit 832, the first skew is adjusted Whole circuit 831 and the second offset adjusting circuit 832 respectively constitute as first integral circuit 835 and second integral circuit 836.Cause This, the component of signal that first integral circuit 835 is positive to polarity from the signal that magnetic sensor element 40 exports is integrated, And the component of signal that second integral circuit 836 is then negative to wherein polarity is integrated.Thus, even if from amplifier 71 output The pulsewidth of signal is very narrow, but the component of signal due to also to polarity can be positive component of signal and polarity is negative is amassed respectively Point, thus amplitude variations are converted to area change, therefore apparent gain just can be improved with simple structure.
[first embodiment 6]
Figure 12 be first embodiment of the invention 6 magnetic pattern detecting apparatus 100 used in magnetic sensor element 40 explanatory diagram.Further, since the basic structure of present embodiment is identical with first embodiment 1～5, therefore for common Partly additional identical label, and the description thereof will be omitted.
In first embodiment 1～5, in magnetic sensor element 40 and detection coil 49, only magnet exciting coil 48 is applied Plus excitation signal, but in the present embodiment, as shown in figure 12, magnet exciting coil 48 and detection coil 49 are connected in series, Excitation signal is all applied to magnet exciting coil 48 and detection coil 49.And, by amplifier 71 and magnet exciting coil 48 and detection coil Coupling part between 49 is connected, by coupling part between magnet exciting coil 48 and detection coil 49 for the signal to amplifier 71 Carry out differential output.
So, in the present embodiment, it is provided with two for exporting sensor output signal as differential output Coil (magnet exciting coil 48 and detection coil 49), differential output signal is exported to amplifier 71.Become therefore, it is possible to absorb temperature The external disturbance such as change.
In addition, present embodiment is also identical with first embodiment 1, in enlarging section 70, it is provided with cr differential circuit 73 Reference voltage generating unit 72 generates the signal changing in linkage with excitation signal, and will be defeated as reference voltage for described signal Enter to amplifier 71.Therefore, because the difference of reference voltage and the sensor output signal from magnetic sensor element 40 output is relatively Little, even if thus not adding the circuit that bridge circuit etc. can lead to cost to raise, gain of amplifier 71 etc. also can be improved, can Realize such and first embodiment 1 identical effect.
Additionally, present embodiment employs the structure arranging integrating circuit on the basis of first embodiment 1, but also may be used Structure using the differential output utilizing magnetic sensor element 40 in first embodiment 2～5.
(other embodiment of first embodiment)
In above-mentioned embodiment, when making medium 1 and magnetic sensor device 20 relative movement, it is to make medium 1 mobile, but Medium 1 may also be employed fix and the structure of magnetic sensor device 20 movement.In addition, in above-mentioned embodiment, employing permanent magnetism Body is as magnetic field applying magnet 30, but also can use electromagnet.
[second embodiment]
Referring to the drawings, second embodiment of the present invention is described.In addition, second embodiment is that Section 2 invention is carried out The embodiment illustrating.With regard in the structure of the magnetic pattern detecting apparatus in second embodiment, magnetic pattern detecting apparatus In the structure of magnetic sensor device that uses, the structure of magnetic sensor element used in magnetic sensor device, medium From the medium being formed with different types of magnetic pattern in characteristic of various magnetic inks being formed etc., magnetic pattern detecting apparatus In detect whether the principle that there is magnetic pattern, due to can use and Fig. 1 of first embodiment, Fig. 2, Fig. 3, Fig. 6, figure Magnetic pattern detecting apparatus described in 7, magnetic sensor device, magnetic sensor element, characteristic of magnetic ink etc., detection Go out principle identical structure with the presence or absence of magnetic pattern, characteristic etc., principle, therefore, it is detailed to identical incomplete structure here Describe in detail bright.
[second embodiment 1]
(structure of signal processing part 60)
Figure 13 is the explanatory 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 explanatory diagram of major part in indication circuit portion, and Figure 13 (b) is to represent to multiple magnetic sensor element It is scanned thus becoming the explanatory diagram of the situation of conducting state successively.Further, since the present embodiment shown in Figure 13 (a) The basic structure in circuit portion identical with the structure in the circuit portion of the first embodiment 1 described in Fig. 4 (a), therefore for altogether Same partly additional identical label illustrates.
In present embodiment, the circuit portion 5 shown in Figure 13 (a) generally comprises: using the alternating current shown in Fig. 3 (b) as Excitation signal is applied to field circuit 50 and detection coil 49 (reference Fig. 2 with magnetic sensor element 40 of magnet exciting coil 48 (b) and Fig. 3 (a)) signal processing part 60 that is electrically connected.Field circuit 50 includes: with the multiple magnetic sensors shown in Fig. 2 Element 40 respectively corresponding multiple excitation exciting amplifier 51, for successively to multiple excitation exciting amplifiers 51 provide encourage The multiplexer 52 of magnetic signal and according to excitation command signal generate excitation signal amplifier 53, this field circuit 50 according to Secondary offer to the magnet exciting coil 48 (with reference to Fig. 2 (b) and Fig. 3 (a)) of multiple magnetic sensor element 40 is amplified with excitation through excitation Device 51 be exaggerated after excitation signal.Sometimes also multiple magnetic sensor element can be set in the rear class of multiplexer 52 40 excitation being shared exciting amplifiers 51.
Signal processing part 60 is according to the sensor output signal of detection coil 49 output from magnetic sensor device 20, raw Become the first signal s1 corresponding with residual magnetic flux density value and secondary signal s2 corresponding with magnetic conductivity value, and will They export upper control unit (not shown).
More specifically, signal processing part 60 includes enlarging section 70, extraction unit 80 and digital signal processing section 90, wherein, Enlarging section 70 has the amplifier 71 that the sensor output signal to magnetic sensor element 40 output is amplified, extraction unit 80 Extract peak value and valley from the signal of enlarging section 70 output, digital signal processing section 90 has a/d converter 91.Extraction unit 80 signals that amplify including exporting amplifier 70 are sequentially output the multiplexer 81 of rear class, clamp circuit 82 and to pincers The signal of position circuit 82 output enters the offset adjusting circuit 83 of line displacement adjustment.Clamp circuit 82 is included to enlarging section 70 output Amplified sensor output signal carries out the first diode 821 of rectification, the amplified biography to enlarging section 70 output Sensor output signal carries out the polarity inversion circuit 822 of polarity inversion and anti-to having carried out polarity in polarity inversion circuit 822 Signal after turning carries out the second diode 823 of rectification.Thus, offset adjusting circuit 83 includes defeated to the first diode 821 Go out the first offset adjusting circuit 831 into line displacement adjustment and the output to the second diode 823 enters the second of line displacement adjustment Offset adjusting circuit 832, the first offset adjusting circuit 831 and the second offset adjusting circuit 832 include offseting adjustment benchmark electricity Pressure generative circuit 831a, 832a and operational amplifier 831b, 832b.Sometimes also can arrange many in the rear class of multiplexer 81 The amplifier 71 that individual magnetic sensor element 40 is shared.
In addition, extraction unit 80 is additionally provided with holding circuit 84 in the rear class of offset adjusting circuit 83, after holding circuit 84 Level is additionally provided with gain setting unit 85.Holding circuit 84 includes the peak value of the output signal to the first offset adjusting circuit 831 in addition The first peak holding circuit 841 the keeping and peak value of the output signal of the second offset adjusting circuit 832 is kept the Two peak holding circuits 842.Here, to the second offset adjusting circuit 832 input be from enlarging section 70 output signal through pole Carried out the signal after rectification after sex reversal circuit 822 has carried out polarity inversion and through the second diode 823.Therefore, the second peak Value holding circuit 842 is equivalent to the valley hold circuit that the valley of the amplification signal exporting enlarging section 70 is kept.
Gain setting unit 85 includes: the gain setting the gain of value that the first peak holding circuit 841 is kept sets use First amplifier 851 and set the gain of the gain of value that the second peak holding circuit 842 (valley hold circuit) kept and set Surely use the second amplifier 852, this gain setting unit 85 is by the first peak holding circuit 841 and the second peak holding circuit 842 institute The value keeping is set as the gain specifying, is then output to the a/d converter 91 of digital signal processing section 90.
Digital signal processing section 90 includes a/d converter 91, add circuit 92 and subtraction circuit 93, wherein, add circuit The value that 92 values being kept the first peak holding circuit 841 are kept with the second peak holding circuit 842 is added, thus generating First signal s1, the value that the first peak holding circuit 841 is then kept by subtraction circuit 93 and the second peak holding circuit 842 institute The value keeping is subtracted each other, thus generating secondary signal s2.
Here, as described later, the magnetic in order to determine a region on medium 1 is special for magnetic sensor element 40 Property, the multiple signals of middle output (being four signals in present embodiment) during a scanning.Therefore, digital signal processing section 90 It is provided with handling averagely portion 96 in the rear class of a/d converter 91.Thus, in a/d converter 91 by the first peak holding circuit 841 After four values being kept with the second peak holding circuit 842 are converted to data signal, handling averagely portion 96 is to this four Value averages process, and add circuit 92 carries out addition process using the value obtaining after above-mentioned handling averagely.In addition, in a/ Four values that first peak holding circuit 841 and the second peak holding circuit 842 are kept are converted to numeral letter by d converter 91 Number afterwards, handling averagely portion 96 averages process to this four values, and subtraction circuit 93 then utilizes above-mentioned handling averagely The value obtaining afterwards carries out subtraction process.
Digital signal processing section 90 has the control of output switching control signal, excitation command signal, offset control signal etc. Signal output portion 94 processed, switch-over control signal controls multiplexer 52,81, and controls as Fig. 2 (a), Fig. 2 (b) and Fig. 3 As shown in (b) on media width direction, be namely on the orthogonal column direction y of line direction x in the moving direction with medium 1 It is arranged with multiple scanning motions of magnetic sensor element 40 and the sequential of other circuit operation.
Using said structure digital signal processing section 90 to upper control unit output (not shown) the first signal s1 and Secondary signal s2, in above-mentioned control unit, judges the true and false of medium 1 based on the first signal s1 and secondary signal s2.More specifically For, it is provided with detection unit in upper control unit, this detection unit will be first with magnetic sensor to the first signal s1 and secondary signal s2 Relative position information between part 40 and medium 1 is associated, and is compareed with the Comparing patternses being previously recorded in record portion, from And judging the true and false of medium 1, described detection unit is based on the program being previously recorded in the record portions such as rom or ram (not shown) and enters The fixed process of professional etiquette, thus judge the true and false of medium 1.
(scanning motion of magnetic sensor element 40)
Figure 14 is the explanation representing the scanning motion of magnetic pattern detecting apparatus 100 of second embodiment of the invention 1 etc. Figure, Figure 14 (a) is the explanatory diagram of the situation that plane earth represents that magnetic sensor element 40 arranges on column direction y, and Figure 14 (b) is The layout of magnetic sensor element is amplified with the explanatory diagram representing, Figure 14 (c) be represent a scanning during in be in and lead The explanatory diagram of location situation of movement on medium 1, Figure 14 (d) when the magnetic sensor element of logical state scans every time Be by one scan during in magnetic sensor element in the conduction state scan every time when location move on medium 1 The explanatory diagram of the further enlarged representation of dynamic situation.Figure 15 is the magnetic pattern detection dress representing second embodiment of the invention 1 Put the explanatory diagram of 100 operation condition in circuit portion, Figure 15 (a) is to represent between the frequency of detection signal and sampling holding action Relation explanatory diagram, Figure 15 (b) is the frequency representing the handling averagely portion 96 shown in a/d converter 91 and Figure 13 (a) The explanatory diagram of characteristic.
As shown in Figure 14 (a) and Figure 14 (b), in the magnetic pattern detecting apparatus 100 of present embodiment, with medium 1 On the orthogonal column direction y of moving direction x (media width direction), it is arranged with 20 magnetic sensor element 40 and is respectively used to passage Ch1～ch20, by being scanned to this 20 magnetic sensor element 40 on column direction y, from the whole width side of medium 1 Detect magnetic pattern upwards.As long as that is, being scanned to multiple magnetic sensor element 40 in a column direction, with regard to energy 20 magnetic sensor element 40 of enough passage ch1～ch20 detect data respectively.And medium 1 is (mobile in the row direction Direction x) is mobile.Therefore, it is possible to detect magnetic pattern from whole medium 1.
Using said structure magnetic pattern detecting apparatus 100 in the present embodiment, will be passed by connecting gear 10 The translational speed of the medium 1 sending is set to v (mm/ μ s), and size on moving direction x for the magnetic sensor element 40 is set to t (mm), The scanning times that time per unit ta (μ s) is scanned to magnetic sensor element 40 on described column direction y are set to n time, then Translational speed v, unit interval ta, size t and scanning times n meet following relational expression:
(v×ta)≤(t×n)
In formula, n is more than 2 integer.
In formula, during unit interval ta is a scanning of the row magnetic pattern for detecting medium 1.Therefore, this reality Apply in mode, one scanning during in, column direction y is carried out to magnetic sensor element 40 n time scanning, based on magnetic biography Sensor component 40, by all data obtained by described n time scanning, detects a row magnetic pattern.
More specifically, in the magnetic pattern detecting apparatus 100 of present embodiment, translational speed v, unit interval ta, chi Very little t and scanning times n etc. is for example set as following condition:
The translational speed v=0.0016mm/ μ s of medium；
Unit interval ta (during a scanning)=200 μ s (5khz)；
Size t (thickness size)=0.3mm on the moving direction x of medium 1 for the magnetic sensor element 40；
Scanning times n=4 in unit interval ta (during a scanning).
Thus, during a scanning, displacement etc. of medium 1 becomes following condition:
Displacement=the 0.32mm of medium 1 during one scanning；
Displacement=the 0.08mm of single pass medium 1；
Scan required time=50 μ s (20khz) each time；
Magnetic sensor element 40 time=2.5 μ s in the conduction state in single pass.
If these conditions above-mentioned, then due to becoming following setting value:
(v × ta)=0.32mm
(t × n)=1.2mm
Therefore fully meet relationship below:
(v×ta)≤(t×n)
In formula, n is more than 2 integer.
Thus, if being scanned along column direction y to magnetic sensor element 40 under these conditions, single pass terminates Afterwards, medium 1 moves 0.08mm, but magnetic sensor element 1 size in the direction of movement is 0.3mm.Therefore, present scan and When scanning, magnetic sensor element 40 overlaps on moving direction x in the equimultiple view field on medium 1 next time.
More specifically, as shown in Figure 14 (c) and Figure 14 (d).In Figure 14 (c) and Figure 14 (d), with solid line sch (n, 1) table During showing n-th scanning, when scanning first time, the magnetic sensor element 40 of passage ch1 is located in the on-state Region (equimultiple view field on medium 1 for the magnetic sensor element 40 of passage ch1 in the conduction state).And with singly In (during n-th scanning) during chain-dotted line sch (n, 2) represents this scanning, when scanning for second, the magnetic of passage ch1 passes The region that sensor component 40 is located in the on-state.During representing this scanning with dotted line sch (n, 3) (during n-th scanning) In when third time scans passage ch1 the region that is located in the on-state of magnetic sensor element 40.Use double dot dash line In (during n-th scanning) during sch (n, 4) represents this scanning, in the 4th scanning, the magnetic sensor of passage ch1 is first The region that part 40 is located in the on-state.In addition, when scanning for each time, magnetic sensor element 40 is located in the on-state Region be to move on same position on column direction y in media width direction, but the in order that position in each region Easily identify, in Figure 14 (c) and Figure 14 (d), so that the position in each region is slightly offset in a column direction.Figure 14 (c) and Figure 14 In (d), the region that during scanning as (n+1)th, middle magnetic sensor element 40 is located in the on-state, illustrate only n-th The region that in during+1 scanning, the magnetic sensor element 40 of passage ch1 is located when scanning first time.
In present embodiment, due to meeting above-mentioned relation formula, therefore interior during a scanning, magnetic when scanning for the first time The region that when region at sensor element 40 place and second scanning, magnetic sensor element 40 is located is on moving direction x Overlap.Second when scanning and when third time scans between, third time when scanning and during the 4th scanning between also one Sample, when the region that during present scan, magnetic sensor element 40 is located and next time scanning, magnetic sensor element 40 is located Region overlaps on moving direction x.Thus, when scanning during present scan and next time, magnetic transducing during present scan Device element 40 position in the conduction state the equimultiple view field on medium 1 and on once scan when magnetic sensor unit Part 40 position in the conduction state will not produce gap between the equimultiple view field on medium 1.The magnetic of other passages Property sensor element 40 is same.
In in addition, during scanning this (during n-th scanning) for the first time～the 4th scanning when passage ch1 magnetic Property the region that is located in the on-state of sensor element 40 add up to after region sch1 (n) that obtains, be by solid line sch (n, 1) Region shown in shown region, single dotted broken line sch (n, 2), the region shown in dotted line sch (n, 3), double dot dash line sch (n, 2) The region that shown region obtains after adding up to, the in (during (n+1)th scanning) during region sch1 (n) and next scanning The region (region shown in solid line ch1 (n+1,1)) that during single pass, magnetic sensor element 40 is located in the on-state exists Overlap on moving direction.Thus, during this scanning in when scanning the last time magnetic sensor element 40 be in and lead The position of logical state during the equimultiple view field on medium 1 and next scanning in when scanning first time magnetic transducing Device element 40 position in the conduction state will not produce gap between the equimultiple view field on medium 1.In addition, it is other logical The magnetic sensor element 40 in road is same.
Shown in above-mentioned scanning motion such as Figure 13 (b), during a scanning in, so that the magnetic of each passage ch1～ch20 is passed The scanning that sensor component 40 becomes conducting state successively amounts to execution four times, and the a/d converter 91 shown in Figure 13 (a) is dynamic with above-mentioned Make to become the sequential of conducting state in linkage according to each magnetic sensor element 40, each passage (was adopted with the sampling period of 50 μ s Sample frequency=20khz) signal that exports magnetic sensor element 40 is converted into data signal.
In present embodiment, the time in the conduction state for the magnetic sensor element 40 of each passage is foreshortened to 2.5 μ s, Thus be 2mhz by the frequency respective settings of the excitation signal shown in Fig. 3 (b).Therefore, as shown in Figure 15 (a), once it is being in In the time (2.5 μ s) of conducting state, magnetic sensor element 40 exports multiple (these to the extraction unit 80 shown in Figure 13 (a) It is three in embodiment) component of signal (sensor output signal) shown in Fig. 3 (c).That is, the frequency that excitation signal has Make to contain the excitation signal composition in multiple cycles in the signal that in single pass, multiple magnetic sensor element 40 each export Component of signal, therefore, detection signal that in single pass, multiple magnetic sensor element 40 each export all comprises many respectively Individual component of signal.Thus, even if magnetic sensor element 40 time in the conduction state shorten, but by institute in Figure 13 (a) The first peak holding circuit 841 in the holding circuit 84 shown and the second peak holding circuit 842 also can carry out three holdings, because This can reliably carry out peak value holding.
Additionally, in present embodiment, due to being input in the signal of the a/d converter 91 shown in Figure 13 (a), required Frequency band is the relatively low frequency band of frequency, therefore, shown in solid, to each passage ch all adopting a/d converter 91 in such as Figure 15 (b) Sample frequency setting is 20khz, sets it to relatively low frequency.Therefore, it is possible to suitably magnetic sensor element 40 be exported Signal be converted to data signal.That is, for the structure being illustrated with reference to Figure 18, in such as Figure 15 (b), work is represented by dashed line Shown in reference example, the sample frequency of a/d converter 91 is set as 1mhz, even if then in the time once in the conduction state In (flat part of the signal after keeping in Figure 15 (a)) carry out four times and sample and be averaging processing, but be higher than letter for frequency The noise of the high fdrequency component of number frequency band (5khz), still suffers from the problem of its noise reduction very little.And in the present embodiment, due to The sample frequency of a/d converter 91 is set as 20khz, therefore, even if carrying out four average treatment in the same manner it is also possible to reduce Frequency is higher than the noise of the high fdrequency component of 5khz.
(main efficacy results of second embodiment 1)
As described above, in the magnetic pattern detecting apparatus 100 of present embodiment, due to translational speed v (the mm/ μ of medium 1 S), size t (mm) on moving direction x for the magnetic sensor element 40, time per unit ta (μ s) in media width direction are Following relational expression met to the scanning times n that magnetic sensor element 40 is scanned on column direction y:
(v×ta)≤(t×n)
In formula, n is more than 2 integer
Therefore, during present scan magnetic sensor element 40 region residing in the on-state and next time scan when Magnetic sensor element 40 will not produce gap between region residing in the on-state.Thus, even with to along row Multiple magnetic sensor element 40 of direction y arrangement are scanned and so that medium 1 is moved with respect to magnetic sensor 40 Mode, also reliably can detect magnetic pattern from all surfaces of medium 1.
In present embodiment, during unit interval ta is used to a scanning of a row magnetic pattern of detection medium 1, base Carry out in magnetic sensor element 40 is passed through during one scanning scans obtained data, detection medium 1 One row magnetic pattern.That is, carry out n scanning (present embodiment in during a scanning in order to detect a row magnetic pattern In for four times scanning).Therefore, because a row magnetic pattern can be detected based on the multiple data obtained by Multiple-Scan, because Even it is also possible to delay in the case that this contains the impact such as noise in any one data obtained by magnetic sensor element 40 Affect with produced by above-mentioned noise.
In addition, in present embodiment, due to the n carrying out in being passed through during a scanning based on magnetic sensor element 40 A row magnetic pattern to detect medium 1 for all data obtained by secondary scanning, therefore, when present scan and next time scanning, Equimultiple view field on medium 1 for the magnetic sensor element 40 can overlap.Thus, it is possible to accurately detect Jie The magnetic characteristic of matter 1.
In addition, in the magnetic pattern detecting apparatus 100 of present embodiment, due to being to share magnetic sensor device 20, root To detect whether there is each magnetic pattern and its forming position according to both residual magnetic flux density value and magnetic conductivity value, therefore Between the mensure and the mensure of magnetic conductivity value of residual magnetic flux density value will not generation time poor.Thus, even one While in the case of making magnetic sensor device 20 and medium 1 mobile while measuring, signal processing part 60 also can be with simple Structure carries out high-precision detection.In addition, for conveyer 10, also only passing through the position of magnetic sensor device 20 at it On require operation stability, therefore can try hard to simplify structure.
And, according to the magnetic pattern detecting apparatus 100 of present embodiment, for using containing hard magnetic material and soft magnetic materials The magnetic ink of both is formed with the medium 1 of magnetic pattern or using containing positioned at the centre of hard magnetic material and soft magnetic materials The magnetic ink of material is formed with the medium 1 of magnetic pattern, also can carry out the detection of magnetic pattern.That is, magnetic characteristic is located at Magnetic pattern as the centre of the first magnetic pattern and the second magnetic pattern, such as shown in Fig. 6 (d1), because hysteresis curve is located at The hysteresis curve of the magnetic pattern of hard magnetic material shown in Fig. 6 (b1) and the magnetic pattern of soft magnetic materials shown in Fig. 6 (c1) The centre of hysteresis curve, therefore can get the signal pattern shown in Fig. 6 (d4), for described magnetic pattern, also can detect it Whether there is and its forming position.
And, in the magnetic sensor device 20 of present embodiment, applying magnet 30 in magnetic field is with respect to magnetic sensor The both sides of the moving direction in medium 1 for the element 40 are provided as magnetic field and apply to apply to use the second magnet with the first magnet 31 and magnetic field 32.Therefore, as shown in figure 1, applying with the first magnet 31, the medium 1 of the direction movement shown in along arrow x1 to be carried out using magnetic field Magnetization, afterwards, using magnetic sensor element 40, in the state of being capable of detecting when to apply bias magnetic field to the medium 1 after magnetization Magnetic flux, and apply with the second magnet 32, the medium 1 of the direction movement shown in along arrow x2 to be magnetized using magnetic field, it Afterwards, using magnetic sensor element 40, it is capable of detecting when to apply the magnetic flux in the state of bias magnetic field to the medium 1 after magnetization. Thus, if the magnetic pattern detecting apparatus 100 of present embodiment are used for automatic teller machine, can determine that be stored in medium 1 The true and false, and also can determine that the true and false of medium 1 to be taken out.
[second embodiment 2]
Figure 16 is the magnetic sensor element 40 of the magnetic pattern detecting apparatus 100 representing second embodiment of the invention 2 The explanatory diagram of the position being located in each scanning.In addition, the phase of the basic structure of present embodiment and second embodiment 1 With.Therefore, in the following description, to common partly additional identical label, simultaneously the description thereof will be omitted.
The magnetic pattern detecting apparatus 100 of present embodiment are also identical with second embodiment 1, translational speed v of medium 1 (mm/ μ s), magnetic sensor element 40 are in size t (mm) on moving direction x, time per unit ta (μ s) on column direction y The scanning times n that magnetic sensor element 40 is scanned is met with following relational expression:
(v×ta)≤(t×n)
In formula, n is more than 2 integer.
Therefore, as shown in figure 16, during the twice sweep being carried out continuously in first time～the 4th scanning, magnetic sensor The region that element 40 is located in the on-state overlaps in the direction of movement.Here, in embodiment 1, it is based on magnetic Property sensor element 40 detect medium 1 by all data obtained by carry out four times scannings in during a scanning One row magnetic pattern, and in present embodiment, then be passed through during a scanning based on magnetic sensor element 40 in carry out N scanning in part scanning obtained by the row magnetic pattern to detect medium 1 for the data.
More specifically, in present embodiment, carry out in being passed through during a scanning based on magnetic sensor element 40 N scanning in meet following condition twice less than the multiple data obtained by the scanning of n time, detect medium 1 One row magnetic pattern, this condition is: present scan and next time scan when, magnetic sensor element 40 on media described etc. Times view field overlaps on the moving direction x of medium 1.
For example, as shown in figure 16, magnetic sensor element 40 institute in the on-state of passage ch1 when scanning for the first time Region scan with third time when passage ch1 the region that is located in the on-state of magnetic sensor element 40 moving Overlap on dynamic direction x.Therefore, in the present embodiment, magnetic sensor element 40 is passed through with scanning when institute for the first time The data obtaining and magnetic sensor element 40 average process by obtained data during third time scanning, and base In this result, detect a row magnetic pattern of medium 1.
Situation using this structure is also identical with embodiment 1, present scan (scan for the first time) and next time scanning When (third time scans), because there is part in the region that magnetic sensor element 40 is located in the on-state on moving direction x Overlap, therefore, it is possible to accurately detect the magnetic characteristic of medium 1.Further, since obtained by being based on by twice sweep Data detecting a row magnetic pattern, even therefore containing in any one data obtained by magnetic sensor element 40 It is also possible to relax the produced impact of above-mentioned noise in the case of the impact such as noise.
In addition it is also possible to according to size t on moving direction x of translational speed v of medium 1, magnetic sensor element 40, Scanning times n that time per unit ta (μ s) is scanned to magnetic sensor element 40 on column direction y etc., is passed based on magnetic Sensor component 40 meet in scanning in passing through during a scanning carry out n time following condition twice less than n time Scanning obtained by multiple data, a row magnetic pattern of detection medium 1, this condition is: present scan and next time scanning When, magnetic sensor element 40 does not overlap on the moving direction x of medium 1 in the equimultiple view field on medium 1 but connects Continuous.
[second embodiment 3]
Figure 17 is the magnetic sensor element 40 of the magnetic pattern detecting apparatus 100 representing second embodiment of the invention 3 The position being located in each scanning and its explanatory diagram of the position of sensor detection range.In addition, present embodiment is basic Structure is identical with second embodiment 1.Therefore, in the following description, to common partly additional identical label and save Slightly its explanation.
The magnetic pattern detecting apparatus 100 of present embodiment are also identical with second embodiment 1, translational speed v of medium 1 (mm/ μ s), magnetic sensor element 40 are in size t (mm) on moving direction x, time per unit ta (μ s) on column direction y The scanning times n that magnetic sensor element 40 is scanned is met with following relational expression:
(v×ta)≤(t×n)
In formula, n is more than 2 integer.
Therefore, as shown in figure 17, during the twice sweep being carried out continuously in first time～the 4th scanning, magnetic sensor The region that element 40 is located in the on-state overlaps in the direction of movement.Here, in embodiment 1, it is based on magnetic Property sensor element 40 detect medium 1 by all data obtained by carry out four times scannings in during a scanning One row magnetic pattern, and in present embodiment, then be passed through during a scanning based on magnetic sensor element 40 in carry out N scanning in part scanning obtained by the row magnetic pattern to detect medium 1 for the data.
More specifically, as shown in figure 17, the sensor detection range of the reality of magnetic sensor element 40 is greater than this Equimultiple view field on medium 1 for the magnetic sensor element 40, magnetic sensor element 40 is on the moving direction x of medium 1 Sensor detection range size s (mm) be more than size t on moving direction x for the magnetic sensor element 40.Therefore, this reality Apply in mode, be passed through during a scanning based on magnetic sensor element in scan carry out n time in meet following condition Twice less than n time scanning obtained by multiple data, detection medium 1 a row magnetic pattern, this condition is: this When secondary scanning and next time scanning, sensor detection range overlaps on the moving direction x of medium 1.
For example, as shown in figure 17, when scanning for the first time, the magnetic sensor element 40 of passage ch1 is in the on-state The magnetic sensor element 40 of passage ch1 sensor in the on-state when sensor detection range is scanned with third time Detection range overlaps.Therefore, in the present embodiment, gained when magnetic sensor element 40 being passed through to scan for the first time To data and magnetic sensor element 40 scanned by third time when obtained data average process, and be based on This result, detects a row magnetic pattern of medium 1.
Situation using this structure is also identical with second embodiment 1, present scan (scan for the first time) and next time During scanning (third time scans), partly weigh because the sensor detection range of magnetic sensor element 40 has on moving direction x Folded, therefore, it is possible to accurately detect the magnetic characteristic of medium 1.Further, since can be based on obtained by by twice sweep Data is detecting a row magnetic pattern, even contain therefore in any one data obtained by magnetic sensor element 40 making an uproar It is also possible to relax the produced impact of above-mentioned noise in the case of the impact such as sound.
In addition it is also possible to according to size t on moving direction x of translational speed v of medium 1, magnetic sensor element 40, Scanning times n that time per unit ta (μ s) is scanned to magnetic sensor element 40 on column direction y etc., is passed based on magnetic Sensor component 40 meet in scanning in passing through during a scanning carry out n time following condition twice less than n time Scanning obtained by multiple data, a row magnetic pattern of detection medium 1, this condition is: present scan and next time scanning When, sensor detection range does not overlap but continuous on the moving direction x of medium 1.
(other embodiment of second embodiment)
In above-mentioned embodiment, when making medium 1 and magnetic sensor device 20 relative movement, it is to make medium 1 mobile, but Medium 1 may also be employed fix and the structure of magnetic sensor device 20 movement.In addition, in above-mentioned embodiment, employing permanent magnetism Body is as magnetic field applying magnet 30, but also can use electromagnet.
In above-mentioned embodiment, the n that carries out in illustrating to pass through during a scanning based on magnetic sensor element 40 Secondary scanning in four times or twice sweep obtained by data come to detect medium 1 a row magnetic pattern example but it is also possible to Obtained by once or three scannings in the n scanning carrying out in being passed through during a scanning based on magnetic sensor element 40 The row magnetic pattern to detect medium 1 for the data, as long as being passed through during one scans based on magnetic sensor element 40 In data obtained by one or many scanning in carry out the n time scanning row magnetic pattern to detect medium 1.More Specifically, carry out n scanning in during a scanning, when scanning every time, data obtained by magnetic sensor element 40, But during a row magnetic pattern of medium 1 to be determined, the n that carries out in being passed through during a scanning using magnetic sensor element 40 Single pass in secondary scanning or the data obtained by Multiple-Scan.
In addition, in above-mentioned embodiment, entering in illustrating to pass through during a scanning based on magnetic sensor element 40 Meet in n scanning of row the data obtained by the Multiple-Scan of following condition, detect medium 1 a row magnetic pattern example Son, this condition is: when present scan and next time scanning, the sensor detection range of magnetic sensor element 40 is mutually continuous, but The many of following condition are met in the n scanning that can also carry out in passing through during a scanning based on magnetic sensor element 40 Data obtained by secondary scanning, a row magnetic pattern of detection medium 1, this condition is: when present scan and next time scanning, magnetic Property sensor element 40 sensor detection range is discontinuous and interval.Be also based on by present scan and next During secondary scanning, the sensor detection range of magnetic sensor element 40 is consecutive scans obtained data and by this Scan discontinuous with the sensor detection range of magnetic sensor element 40 when scanning next time and interval scanning gained The data arriving, to detect a row magnetic pattern of medium 1.
Additionally, which time in the n scanning carrying out in being passed through during a scanning based on magnetic sensor element 40 During scanning, detecting a row magnetic pattern of medium 1, this can also be variable to obtained data, can be according to from upper control Portion processed or outside are sent to the instruction of digital signal processing section 90 and are arbitrarily set.According to this structure, then can Accuracy of detection required by species according to medium 1 and magnetic pattern detecting apparatus 100 etc. and realize optimal action.

Claims (12)

1. a kind of magnetic pattern detecting apparatus, including detecting the magnetic sensor element of magnetic characteristic and make to be given an account of from medium Connecting gear that matter moves with respect to this magnetic sensor element it is characterised in that
Described magnetic sensor element arrange on the column direction orthogonal with the moving direction of described medium multiple,
The translational speed of the described medium being transmitted by described connecting gear is set to v,
Size on described moving direction for the described magnetic sensor element is set to t,
The scanning times that time per unit ta is scanned to described magnetic sensor element in the column direction are set to n time,
Then described translational speed v, described unit interval ta, described size t and described scanning times n meet relationship below:
(v×ta)≤(t×n)
In formula, n is more than 2 integer, and the unit of described translational speed v is mm/ μ s, and the unit of described size t is mm, described list The unit of position time ta is μ s.
2. magnetic pattern detecting apparatus as claimed in claim 1 it is characterised in that
During described unit interval ta is a scanning of the row magnetic pattern for detecting described medium,
Data obtained by the scanning carrying out in being passed through during one scanning based on described magnetic sensor element, detection One row magnetic pattern of described medium.
3. magnetic pattern detecting apparatus as claimed in claim 2 it is characterised in that
Single pass in carry out n time scanning in being passed through during one scanning based on described magnetic sensor element or Data obtained by Multiple-Scan, detects a row magnetic pattern of described medium.
4. magnetic pattern detecting apparatus as claimed in claim 3 it is characterised in that
Multiple-Scan institute in the n scanning carrying out in being passed through during one scanning based on described magnetic sensor element The data obtaining, detects a row magnetic pattern of described medium.
5. magnetic pattern detecting apparatus as claimed in claim 4 it is characterised in that
All numbers obtained by the n scanning carrying out in being passed through during one scanning based on described magnetic sensor element According to a row magnetic pattern of the described medium of detection.
6. magnetic pattern detecting apparatus as claimed in claim 4 it is characterised in that
Following condition is met in the n scanning carrying out in passing through during one scanning based on described magnetic sensor element Twice less than n time scanning obtained by multiple data, detect described medium a row magnetic pattern, this condition It is: when present scan and next time scanning, described magnetic sensor element equimultiple view field on media described is described Overlap on moving direction；Or when present scan and next time scanning, described magnetic sensor element is in described medium On equimultiple view field do not overlap on described moving direction but continuous.
7. magnetic pattern detecting apparatus as claimed in claim 6 it is characterised in that
Following condition is met in the n scanning carrying out in passing through during one scanning based on described magnetic sensor element Twice less than n time scanning obtained by multiple data, detect described medium a row magnetic pattern, this condition It is: when present scan and next time scanning, described magnetic sensor element equimultiple view field on media described is described Overlap on moving direction.
8. magnetic pattern detecting apparatus as claimed in claim 4 it is characterised in that
Sensor detection range on described moving direction for the described magnetic sensor element is more than described magnetic sensor element Size t on described moving direction,
Following condition is met in the n scanning carrying out in passing through during one scanning based on described magnetic sensor element Twice less than n time scanning obtained by multiple data, detect described medium a row magnetic pattern, this condition It is: when present scan and next time scanning, described sensor detection range overlaps on described moving direction；Or this When secondary scanning and next time scanning, described sensor detection range does not overlap but continuous on described moving direction.
9. magnetic pattern detecting apparatus as claimed in claim 8 it is characterised in that
Following condition is met in the n scanning carrying out in passing through during one scanning based on described magnetic sensor element Twice less than n time scanning obtained by multiple data, detect described medium a row magnetic pattern, this condition It is: when present scan and next time scanning, described sensor detection range overlaps on described moving direction.
10. magnetic pattern detecting apparatus as claimed in claim 4 it is characterised in that
When based on described magnetic sensor element during one scanning in obtained multiple data detect and given an account of During one row magnetic pattern of matter, process is averaged to the plurality of data.
11. magnetic pattern detecting apparatus as claimed in claim 3 it is characterised in that
Any single pass in the n scanning carrying out in being passed through during one scanning based on described magnetic sensor element When obtained data detecting that a row magnetic pattern of described medium is variable.
12. magnetic pattern detecting apparatus as claimed in claim 1 it is characterised in that
Described magnetic sensor element carries out excitation output signal by excitation signal,
The frequency that described excitation signal has makes the signal that described in single pass, multiple magnetic sensor element each export Comprise the component of signal being made up of the described excitation signal in multiple cycles.
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