CN1384472A - Magnetic head - Google Patents

Magnetic head Download PDF

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Publication number
CN1384472A
CN1384472A CN02106091A CN02106091A CN1384472A CN 1384472 A CN1384472 A CN 1384472A CN 02106091 A CN02106091 A CN 02106091A CN 02106091 A CN02106091 A CN 02106091A CN 1384472 A CN1384472 A CN 1384472A
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CN
China
Prior art keywords
magnetic head
yoke
gap
magnet
foot
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN02106091A
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Chinese (zh)
Other versions
CN1216370C (en
Inventor
右田实雄
近森雅文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KK Mineruba
Minerva KK
Original Assignee
KK Mineruba
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KK Mineruba filed Critical KK Mineruba
Publication of CN1384472A publication Critical patent/CN1384472A/en
Application granted granted Critical
Publication of CN1216370C publication Critical patent/CN1216370C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/1272—Assembling or shaping of elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/23—Gap features
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/255—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for protection against wear

Abstract

The present invention relates to a magnetic head (11) which is provided with yokes (13) in which a gap (G) is formed on the front part (13a) of the inspection surface (13d), a magnet (14), disposed in the gap, whose magnetic axis is extended toward a direction crossing the inspection surface, and coils (15) wound on the yokes. The present invention provides a magnetic head for a high precision test without pressing the testing object on the inspection surface.

Description

Magnetic head
Technical field
The present invention relates to magnetic head, relate in particular to and to check that object is pressed in the magnetic head that just can carry out the high precision inspection on the check surface.
Background technology
Having a kind of in being loaded into the paper money identifier of automatic vending machine etc. is the true and false with magnetic head identification bank note.For example, magnetic head shown in Figure 5 can detect the interior magnet-wire of bank note.This magnetic head 1 has the 1st and the 2nd yoke 3 that is fixed on the supporting station 6, forms gap g between the top ends 3a of two yokes 3.Having magnet 4 to be fixed on the supporting station 6 between two yokes 3, the magnetic axis of this magnet 4 (line that connects the N utmost point and the S utmost point) is located at the direction of extending along check surface 3c, the end face of its N utmost point side and S utmost point side respectively with the base end part 3b butt of the 1st and the 2nd yoke 3.The the 1st and the 2nd coil 5 is wound on respectively on the 1st and the 2nd yoke 3, and the two ends of the coil concatermer that two coils 5 are in series mutually are connected with the 1st and the 2nd splicing ear 7 respectively.The medial end of yoke 3, magnet 4, coil 5 and supporting station 6 and splicing ear 7 is contained in the housing 2, potting resin 8 in the housing 2.Expose from housing 2 outside of the top ends 3a of yoke 3, constitutes the check surface 3c that bank note 30 slidably contacts.
In the magnetic head of said structure, the magnetic flux of magnet 4 passes the N utmost point of magnet 4, and the 1st yoke 3, gap g and the 2nd yoke 3 reach the S utmost point.Bank note 30 moves on the check surface 3c of magnetic head 1 in the direction of arrows, and when the magnet-wire on the bank note 30 31 crossed gap g, in the leakage magnetic flux at gap g place and then be that magnetic flux by the 1st and the 2nd yoke 3 changes, induction current flow to the 1st and the 2nd coil 5.The identification loop portion of paper money identifier (figure slightly) is the true and false of discerning bank note 30 according to through the induction current intensity and the variation on time shaft thereof of 7 inputs of the 1st and the 2nd splicing ear.
Adopt above-mentioned traditional magnetic head 1, when the magnet-wire 31 of bank note 30 by gap g nearby the time, the leakage magnetic flux (Fig. 6) that the gap g between the 1st and the 2nd yoke 3 takes place just changes.The width of gap g is narrow more, and the variation of this leakage magnetic flux is big more, in other words, can improve the detection sensitivity of magnetic head by the width that dwindles gap g.
On the other hand, from crossing the direction of check surface 3c, leakage magnetic flux arrives the distance little (Fig. 6) of check surface 3c.And the arrival of narrower gap magnetic flux distance is more little.In addition, the intensity of leakage magnetic flux along with and check surface 3c between distance become and to reduce greatly and sharply.From above reason as can be known, along with the distance between bank note 30 and the check surface 3c increases, so-called space loss just increases, and the detection sensitivity of magnetic head 1 reduces.
Fig. 8 be with the distance between check surface 3c and the bank note 30 as transverse axis, with space loss as the longitudinal axis, the space loss characteristic of magnetic head 1 when representing 5 gap widths.Declare as can be known by Fig. 8, narrower gap, space loss is big more.In other words, narrower gap, bank note 30 is more little apart from the permission ultimate range of check surface 3c.For example, be that gap width is that the permission ultimate range of the magnetic head 1 of 0.02mm has only about 0.01mm under 50% the situation allowing the maximum space loss.On the other hand, when gap width is 0.2mm, allow ultimate range to be about 0.09mm.
In a word, the gap width of magnetic head 1 and the relation of detection sensitivity are narrower gap, and leakage magnetic flux changes more greatly, helps to improve detection sensitivity, but are that space loss increases simultaneously, become the main cause that reduces detection sensitivity again.Additional disclosure once, along with gap width increases, the magnetic resistance of gap g can raise, so the gap is wide more, leakage magnetic flux changes more little, detection sensitivity is low.
Learn that by above situation the paper money identifier with traditional magnetic head 1 is to dwindle gap width to improve detection sensitivity, with roller or liner bank note 30 is pressed in check surface 3c simultaneously and goes up with the distance between shortening check surface and bank note, and then reduce space loss.Yet, when adopting this structure, because the bank note 30 that is compressed on the check surface 3c of magnetic head 1 will slide on check surface, so the easy abrasion of check surface can make the lost of life of magnetic head 1, and bank note 30 also can produce the fold problem.
Summary of the invention
The object of the invention be to provide a kind of will bank note etc. the inspection object be squeezed in the magnetic head that just can check accurately on the check surface.
Magnetic head of the present invention is characterised in that to have: the top ends that constitutes check surface form the gap yoke, be wound on coil on the yoke, the direction of crossing check surface along magnetic axis extends the magnet that is configured in the gap.
Because magnet extends configuration along the direction that its magnetic axis crosses check surface, so see in the direction of crossing check surface, the arrival distance of magnetic flux increases even check the permission ultimate range between object and the check surface, needn't worry that also detection sensitivity reduces.That is, space loss reduces significantly.Even thereby will not check that object is pressed on the check surface and can do high-precision inspection yet.In addition,, can prevent the magnetic head abrasion, significantly prolong its serviceable life by checking under the state that gently contacts or do not contact check surface at the inspection object.
Description of drawings
Fig. 1 is the cut-open view of the magnetic head of expression the present invention the 1st example.
Fig. 2 represents the magnetic flux that magnet shown in Figure 1 produces.
Fig. 3 is the cut-open view of the magnetic head of expression the present invention the 2nd example.
Fig. 4 is the cut-open view of the magnetic head of expression the present invention the 3rd example.
Fig. 5 is the cut-open view of expression one routine traditional magnetic head.
Fig. 6 represents the leakage magnetic flux around the head gap shown in Figure 5.
Fig. 7 is the curve map of space loss characteristic one example of expression magnetic head shown in Figure 1.
Fig. 8 is the curve map of space loss characteristic one example of expression magnetic head shown in Figure 5.
Embodiment
The magnetic head of the present invention's the 1st example is described below in conjunction with Fig. 1.
The magnetic head 11 of this example is located at for example on the paper money identifier as identification sensor, can detect as the magnet-wire 31 in the bank note 30 of checking object.
Magnetic head 11 is yoke 13, magnet the 14, the 1st and the 2nd magnetic test coil 15 and supporting station 16 to be contained in the housing 12 with the medial end of the 1st and the 2nd splicing ear 17 and molded with resins 18, and the outboard end of the 1st and the 2nd splicing ear 17 is connected with the identification loop portion (figure omits) of paper money identifier.
The central portion 13c that yoke 13 extends by being fixed on above the supporting station 16 and along the magnetic head Width, constitute to the 1st and the 2nd 13b of foot, the top ends 13a that between the 1st and the 2nd foot, extends that the magnetic head short transverse is extended respectively from the two ends of this central portion 13c.Central authorities at yoke top ends 13a form clearance G, and the whole C shape that is is seen in yoke 13 fronts.The outside of yoke top ends 13a constitutes check surface 13d.
Chimeric bar-shaped magnet 14 in the g of the gap of yoke 13.This magnet 14 is configured in the clearance G along the direction extension that magnetic axis (line that connects the N utmost point and the S utmost point) crosses check surface 13d, (refers to the extreme face of N here) above it and face of top formation of check surface 13d and housing 12.The height dimension of magnet 14 is greater than the height dimension of clearance G, and the magnet bottom is outstanding from clearance G, improves the magnetic flux density by yoke 13 thus.The left and right sides end face of magnet 14 forms face (medial surface) butt with the gap of yoke top ends 13a respectively.
15, two coils 15 of the 1st and the 2nd coil of reeling respectively on the 1st and the 2nd 13b of foot of yoke 13 are connected mutually, and the two ends of this coil concatermer are connected with the 1st and the 2nd splicing ear 17 respectively.By like this coil 15 being wound on the 13b of yoke foot, make the whole narrowed width of magnetic head 11.
The below effect of explanation said structure magnetic head 11.
Magnet 14 extends configuration along the direction that its magnetic axis crosses check surface 13d, as shown in Figure 2, occur in magnet by the N utmost point of magnet 14 to the magnetic flux Φ of the S utmost point around.Compare with the leakage magnetic flux (Fig. 6) on traditional magnetic head 1 (Fig. 5), see in the magnetic head short transverse, the arrival distance of the magnetic flux Φ on the magnetic head 11 is very big, thereby check surface 13d is very big to the permission ultimate range of bank note 30.
Fig. 7 be with the distance between check surface 13d and the bank note 30 as transverse axis, space loss as the longitudinal axis, is represented the space loss characteristic of magnetic head 11 under 2 gap widths.Among Fig. 7, family curve I, II are corresponding with the gap width of 0.6mm and 1.2mm respectively.When allowing the maximum space loss to be 50%, gap width is that the check surface 13d of the magnetic head 11 of 0.6mm is about 0.3mm to the permission ultimate range of bank note 30.This value is about 8 times of permission ultimate range 0.04mm with traditional magnetic head 11 of 0.1mm gap width.
Adopt the magnetic head 11 of this example, under the same condition of space loss, can increase the distance between bank note 30 and the check surface 13d.Therefore, will bank note 30 be squeezed on the check surface 13d and can carry out the paper money recognition inspection.
That is, be in bank note 30 light contacts or not under the state of contact magnetic head check surface 13d with magnetic head 11 inspection of this example, bank note 30 is moved along check surface 13d direction of arrow in Fig. 1, therefore effective.And the magnet-wire in bank note 30 31 N by magnet 14 extremely before the time, the major part of magnetic flux φ that is evenly distributed on magnetic head 11 outsides is by magnet-wire 31, so also change by the magnetic flux of yoke 13.Magnetic head 11 can not only fine minimizing space loss, and can improve magnetic flux density by yoke 13 (the S utmost point of the magnet 14 of this yoke 13 from clearance G outstanding), when therefore magnet-wire 31 passes through, the flux change of yoke 13 is big, follows this flux change and produce big electromotive force (induction current) on the 1st and the 2nd coil 15.In other words, be exactly that magnetic head 11 detects the highly sensitive of magnet-wire.The electromotive force of induction outputs to the loop portion (figure slightly) of paper money identifier for identification bank note through splicing ear 17 on two coils 15.
As mentioned above, adopt the magnetic head 11 of this example, will bank note 30 be pressed on the check surface 13d and can do high-precision inspection, thereby significantly reduce the abrasion of check surface 13d.Fold can take place in bank note in the time of needn't worrying to check.And can when guaranteeing magnetic head 11 accuracy of detection, enlarge the clearance G of yoke 13, be convenient to processing, the assembling of yoke 13.
Below, the magnetic head of the present invention's the 2nd example is described in conjunction with Fig. 3.
Magnetic head 11 ＇ of the 2nd example have reduced height dimension, and basic structure is the same with magnetic head 11.Magnetic head 11 ＇ are the central portion 13c that coil 15 are wound on yoke 13, and this point is different with magnetic head 11.
Below, the magnetic head of the present invention's the 3rd example is described in conjunction with Fig. 4.
The purpose of the magnetic head 21 of the 3rd example is further to improve the magnetic flux density by yoke, checks sensitivity thereby improve.
The yoke 23 of magnetic head 21 is by the central portion 23c that extends at the magnetic head Width, the 1st and the 2nd 23b of foot that extends to the magnetic head short transverse respectively from the two ends of this central portion 23c, constitute to the 1st and the 2nd top ends 23a that the magnetic head short transverse is extended respectively from the upper end of two 23b of foot.Between the 1st and the 2nd top ends 23a, form the gap.Outside by two top ends 23a constitutes check surface 23d.The whole U font that is is seen in yoke 23 fronts.
Dress magnet 24 in the gap between the 1st and the 2nd top ends 23a of yoke, the N utmost point side end face of magnet 24 and check surface 23d form a face.At the 1st and the 2nd 23b of yoke foot the 1st and the 2nd coil 25 of reeling.Among Fig. 4, symbol 26 expressions are the supporting station of yoke 23 fixedly, and symbol 27 expressions connect the 1st and the 2nd splicing ear at the concatermer two ends of the 1st and the 2nd coil 25.The housing of the medial end of above-mentioned part 23～26 and splicing ear 27 is held in symbol 22 expressions, and symbol 28 expressions are filled in the resin in the housing 22.
The yoke 23 of magnetic head 21 makes the 1st and the 2nd top ends 23a in the gap that forms chimeric magnet 24 extend in the magnetic head short transverse with the 1st and the 2nd 23b of foot, compare with the 1st and the 2nd 13b of foot of yoke 13 on the magnetic head 11 shown in Figure 1, the 1st 23b of foot and the spacing distance between the 2nd 23b of foot of magnetic head Width are little, improve magnetic flux density thus by yoke 23, the flux change of magnet-wire 31 by taking place followed in increasing, to improve the magnet-wire detection sensitivity.The shape of yoke 23 is very simple, can improve assembleability, reduce cost.Also can dwindle the size of magnetic head 21 at Width.
Magnetic head of the present invention is not limited to above-mentioned the 1st to the 3rd example, and all distortion can be arranged.
For example, in the 1st to the 3rd example, magnetic head is to play a role as the paper money recognition sensor that the magnet-wire in the bank note is detected, but the present invention also can be used as other magnetic China ink detecting sensors, MICR (Magnetic Ink Character Readcr magnetic China ink character reader) read sensor, non-contacting sensor, magnetic identification sensor etc.

Claims (6)

1. a magnetic head (11,11 ＇, 12) is characterized in that having: form the yoke (13,23) in gap (G) in the top ends (13a, 23a) that constitutes check surface (13d, 23d),
Be wound on the coil (15,25) on the described yoke,
Cross the direction of described check surface along magnetic axis and extend the magnet (14,24) that is configured in the described gap.
2. magnetic head according to claim 1, it is characterized in that, described yoke (13) have the central portion (13c) that extends at the magnetic head Width and from described central portion two ends respectively to the 1st and the 2nd foot (13b) that the magnetic head short transverse is extended, described top ends (13a) is extended between described the 1st foot and the 2nd foot, and the whole C font that is is seen in described yoke front.
3. magnetic head according to claim 2, it is characterized in that, the short transverse size of described magnet (14,24) is greater than the described short transverse size of stating gap (G), one end face of described magnet and described check surface (13d, 23d) form a face, and described magnet is outstanding from described gap with the reverse end of check surface.
4. magnetic head according to claim 2 is characterized in that, described coil (15) is wound on the described the 1st and the 2nd foot (13b) of described yoke respectively.
5. magnetic head according to claim 1, it is characterized in that, described yoke (13) have the central portion (13c) that extends at the magnetic head Width and from described central portion two ends respectively to the 1st and the 2nd foot (13b) that the magnetic head short transverse is extended, described top ends (13a) is extended between described the 1st foot and the 2nd foot, and described coil (15) is wound on the described central portion (13c) of described yoke.
6. magnetic head according to claim 1, it is characterized in that, described yoke (23) by the central portion (23c) that extends at the magnetic head Width, from described central portion two ends respectively to the 1st and the 2nd foot (23b) that the magnetic head short transverse is extended, constituting to the 1st and the 2nd top ends (23a) that the short transverse of magnetic head is extended respectively from described two foots with the reverse end of central portion, form described gap between the described the 1st and the 2nd top ends, the whole U font that is is seen in described yoke front.
CN021060916A 2001-04-13 2002-04-10 Magnetic head Expired - Fee Related CN1216370C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP115860/2001 2001-04-13
JP2001115860A JP3642291B2 (en) 2001-04-13 2001-04-13 Magnetic head
JP115860/01 2001-04-13

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Publication Number Publication Date
CN1384472A true CN1384472A (en) 2002-12-11
CN1216370C CN1216370C (en) 2005-08-24

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CN021060916A Expired - Fee Related CN1216370C (en) 2001-04-13 2002-04-10 Magnetic head

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JP (1) JP3642291B2 (en)
KR (1) KR20020079611A (en)
CN (1) CN1216370C (en)
TW (1) TW525101B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101167106B (en) * 2005-05-02 2010-06-23 日本电产三协株式会社 Magnetic sensor and paper sheet identification device
CN101777206B (en) * 2005-05-02 2012-06-13 日本电产三协株式会社 Magnetic sensor and device for identifying sheet
CN105913544A (en) * 2016-06-16 2016-08-31 吴俊禹 Money counting machine magnetic head with magnetizing function

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5719515B2 (en) * 2010-02-05 2015-05-20 日本電産サンキョー株式会社 Magnetic sensor device
CN112562171B (en) * 2020-12-09 2022-10-21 全南群英达电子有限公司 Magnetic head shielding cover turning device of currency detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101167106B (en) * 2005-05-02 2010-06-23 日本电产三协株式会社 Magnetic sensor and paper sheet identification device
CN101777206B (en) * 2005-05-02 2012-06-13 日本电产三协株式会社 Magnetic sensor and device for identifying sheet
CN105913544A (en) * 2016-06-16 2016-08-31 吴俊禹 Money counting machine magnetic head with magnetizing function
CN105913544B (en) * 2016-06-16 2018-07-27 吴俊禹 It is a kind of that there is the bill counter magnetic head for adding magnetic function

Also Published As

Publication number Publication date
KR20020079611A (en) 2002-10-19
JP3642291B2 (en) 2005-04-27
CN1216370C (en) 2005-08-24
JP2002312909A (en) 2002-10-25
TW525101B (en) 2003-03-21

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Granted publication date: 20050824

Termination date: 20100410