CN203102426U - Magnetic head capable of detecting soft and hard magnetic feature signals - Google Patents
Magnetic head capable of detecting soft and hard magnetic feature signals Download PDFInfo
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- CN203102426U CN203102426U CN2012207082649U CN201220708264U CN203102426U CN 203102426 U CN203102426 U CN 203102426U CN 2012207082649 U CN2012207082649 U CN 2012207082649U CN 201220708264 U CN201220708264 U CN 201220708264U CN 203102426 U CN203102426 U CN 203102426U
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Abstract
The utility model discloses a magnetic head capable of detecting soft and hard magnetic feature signals, which comprises a shielding shell and at least one magnetic core unit arranged in the shielding shell, wherein the magnetic core unit is provided with a permanent magnet in each magnetic head gap thereon, and generates magnetic lines of force with a constant amount in each magnetic path of the magnetic head unit. Both soft magnetic materials and hard magnetic materials on an object to be detected can cause rearrangement of the magnetic lines of force in the magnetic path, thereby resulting in variations of magnetic flux, producing an induced electromotive force, outputting detection signals, and enabling the magnetic head to carry out detection on the soft and hard magnetic feature signals. Compared with the prior art, the magnetic head only additionally arranges the permanent magnets, and has the advantages of simple structure and stable performance.
Description
Technical field
The utility model relates to a kind of magnetic head, refers in particular to a kind of magnetic head of compatible soft or hard magnetic characteristic input, and it can read soft magnetism feature and the anti-false signal of hard magnetic feature on the object such as bank note, check etc. simultaneously.
Background technology
Growing and perfect along with false proof (discriminating) technology, the whole false proof level of bank note has also had the raising and the leap of matter, for example to have increased the soft magnetism feature on the false proof basis of the hard magnetic feature that continuity quadruplet Renminbi is had false proof for the 5th cover Renminbi, safety line, serial number and pattern printing ink etc. at bank note locate to be mixed with retentive material and soft magnetic material, and are the certain rule distribution.Retentive material (also being permanent magnet) is meant the material that can keep magnetic after the magnetization for a long time, and after external magnetic field removed, the direction of each magnetic domain still can be consistent well, and material has very strong remanent magnetism; Soft magnetic material can not keep the former material that is magnetic after being meant magnetization, and after external magnetic field removed, the direction of each magnetic domain can not be consistent, and material does not have tangible remanent magnetism.
The employed category-A cash inspecting machine of units such as bank is all had the function that compatible soft or hard magnetic characteristic detects by qualitative requirement, can read the soft or hard magnetic characteristic signal on the objects such as bank note, check simultaneously.The magnetic detection structure that the existing compatible soft or hard magnetic characteristic that is used for the category-A cash inspecting machine detects is that the inductance type magnetic head of 61mm or 73mm, single detection channel and indium antimonide semiconducting-magnetic-head that two to four effective magnetic length are 3～5mm constitute by an effective core length generally.Wherein, the inductance type magnetic head is used to detect the Hard Magnetic characteristic signal on the bank note, when bank note process inductance type magnetic head workplace, the magnetic line of force of the remanent magnetism on the head gap induction bank note on the magnetic core unit in the hard magnetic material, cause the variation of the magnetic flux in the magnetic circuit, and in coil, produce correspondent voltage signal and output.Because the soft magnetic material on the bank note does not have tangible remanent magnetism, during bank note process inductance type magnetic head workplace, can't cause that the magnetic flux in the magnetic core unit magnetic circuit changes, so use inductance type magnetic head can't be used to detect the soft magnetism characteristic signal on it.Though the indium antimonide semiconducting-magnetic-head can compatiblely detect soft or hard magnetic characteristic signal, but exist sensing range narrow, cost an arm and a leg and the defective of temperature stability difference, for example when-20 ℃ environment, the detection accuracy rate of indium antimonide semiconducting-magnetic-head just lowers significantly, the phenomenon that currency examine is misrepresented deliberately often occurs.
Summary of the invention
Technical problem to be solved in the utility model is to provide the magnetic head of a kind of stable performance, compatible soft or hard magnetic current signature detection with low cost.
For solving the problems of the technologies described above, the utility model adopts technical scheme as described below: a kind of magnetic head of compatible soft or hard magnetic characteristic input, include a screening can and at least one magnetic core unit that is arranged in the described screening can, each place, head gap thereon, described magnetic core unit respectively is provided with a permanent magnet, and produces the magnetic line of force that constant basis is arranged in each magnetic circuit of described magnetic core unit.
In the said head structure, set magnetic core unit is a plurality of, is provided with an electromagnetic shielding plate between the two adjacent magnetic core unit.
In the said head structure, set magnetic core unit is 16, and each effective core length in magnetic core unit is 11.6mm, and the spacing between the adjacent two magnetic core unit is 0.2mm.
In the said head structure, each magnetic core unit is installed within the magnetic core seat.
In the said head structure, the two sides of described magnetic core seat and the madial wall of described screening can respectively are provided with pad.
In the said head structure, the transition inclined-plane that described screening can is positioned at its workplace both sides is formed with some grooves along its length.
In the said head structure, described magnetic core unit is double magnetic circuit magnetic core unit, it includes one first magnetic core and one and second magnetic core that is oppositely arranged of described first magnetic core, be provided with magnetic sheet in one first between described first magnetic core and second magnetic core, and be provided with a spacer shims separately between the magnetic sheet in both upper ends and described first, and be provided with in one second magnetic sheet in bottom and described first between the magnetic sheet separately or directly be contacted with magnetic sheet in described first, described first magnetic core is arranged with one first coil by one first coil holder, the two ends of described first coil are connected with one first binding post separately, described second magnetic core is arranged with one second coil by one second coil holder, the two ends of described second coil are connected with one second binding post separately, described first binding post and second binding post connect into the circuit board of described magnetic core unit, and lead to the pin that stretches out in outside the described screening can from described circuit board.
In the said head structure, described first magnetic core and second magnetic core all are set to the structure of コ shape.
In the said head structure, described permanent magnet fits in the place, another side with respect to magnetic sheet in described first of corresponding spacer shims.
In the said head structure, the upper surface of described permanent magnet and the workplace of described screening can are in same plane or same curved surface.
Useful technique effect of the present utility model is: this magnetic head is provided with permanent magnet in the place, head gap of magnetic core unit, thereby in the magnetic circuit of this magnetic core unit, produce the magnetic line of force of constant basis, like this, soft magnetic material on the object to be detected or retentive material all can cause the layout again of the magnetic line of force in the magnetic circuit, cause the variation of magnetic flux, produce induction electromotive force and output detection signal, make the utility model can compatible carry out the detection of soft or hard magnetic characteristic signal, than prior art, the utility model only increases the setting of permanent magnet, has simple in structure, the advantage of stable performance.
Description of drawings
Fig. 1 is a perspective view of the present utility model.
Fig. 2 is a decomposition texture synoptic diagram of the present utility model.
Fig. 3 is vertical sectional structure synoptic diagram of the present utility model.
Fig. 4 is a horizontal sectional structure synoptic diagram of the present utility model.
Fig. 5 is the structural representation of magnetic core of the present utility model unit.
Fig. 6 a, 6b and 6c are the principle of work synoptic diagram, and it shows principle of work of the present utility model.
Embodiment
For making those of ordinary skill in the art be expressly understood technical problem to be solved in the utility model, technical scheme and useful technique effect more, the utility model is further elaborated below in conjunction with drawings and Examples.
The magnetic head of compatible soft or hard magnetic current signature detection disclosed in the utility model is mainly used on the cash inspecting machine, to be used for the anti-counterfeiting detection of the object such as bank note, check etc.Extremely shown in Figure 5 as Fig. 1, this magnetic head includes a screening can 10 and at least one magnetic core unit 20 that is arranged in this screening can 10, workplace 100 places of this screening can 10 are formed with an opening 101 along its length direction, magnetic core unit 20 is fixedly set in this screening can 10 inside, and makes its head gap corresponding to this opening 101.
In the embodiment shown in the figures, among this screening can 10, be provided with 16 magnetic core unit 20, thereby constitute a magnetic head with 16 detection channels.Effective core length of each magnetic core unit 20 is 11.6mm, is spaced apart 0.2mm between the adjacent two magnetic core unit 20, and like this, effective detected amplitude of magnetic head is about 188mm, can be used for detecting different types of bank note that existing various countries are issued.Preferably, between two adjacent magnetic core unit 20, be provided with an electromagnetic shielding plate 30,, prevent the electromagnetic interference (EMI) of adjacent detection interchannel so that the magnetic core unit 20 between adjacent is isolated.
Consult Fig. 4 and Fig. 5, magnetic core shown in the drawings unit 20 is double magnetic circuit magnetic core unit, and it includes one first magnetic core 200 and one and second magnetic core 201 that is oppositely arranged of this first magnetic core 200.Wherein, this first magnetic core 200 is designed to the roughly structure of コ shape, adopts the permeability magnetic material preparation, is preferably permalloy; This second magnetic core 201 is designed to the roughly structure of コ shape, adopts the permeability magnetic material preparation, is preferably permalloy.Between this first magnetic core 200 and second magnetic core 201, be provided with one adopt permeability magnetic material (being preferably permalloy) preparation first in magnetic sheet 202, and be provided with a spacer shims 203 separately between the magnetic sheet 202 in both upper ends and this first, and be provided with separately between the magnetic sheet 202 in bottom and this first one adopt permeability magnetic material (being preferably permalloy) preparation second in magnetic sheet 204, like this, this magnetic core unit 20 has formed two magnetic circuits that have the head gap respectively.In this embodiment, first magnetic core 200 and both bottoms of second magnetic core 201 separately by magnetic sheet 204 in corresponding second and with this in first magnetic sheet 202 contact, in other embodiment, also the bottom of first magnetic core 200 and second magnetic core 201 directly can be contacted with this magnetic sheet 202 in first, and need not to be provided with magnetic sheet 204 in second.This first magnetic core 200 is arranged with one first coil 206 by one first coil holder 205, the two ends of this first coil 205 are connected with one first binding post 207 separately, this second magnetic core 201 is arranged with one second coil 209 by one second coil holder 208, the two ends of this second coil 209 are connected with one second binding post 210 separately, this first binding post 207 and second binding post 210 connect into the circuit board 211 of this magnetic core unit 20, and this circuit board 211 leads to the pin 212 that stretches out in outside this screening can 10 certainly, is used to export this magnetic core unit 20 detected bank note, soft or hard magnetic characteristic signal on the objects such as check.
The place is provided with a permanent magnet 213 respectively at the corresponding head gap of closing on of first magnetic 200 and second magnetic core, 201 upper ends, so, by the setting of this permanent magnet 205, produces the magnetic line of force that constant basis is arranged in each magnetic circuit of this magnetic head unit 20.In this preferred embodiment, this permanent magnet 213 fits in the place, another side with respect to this magnetic sheet 202 in first of corresponding spacer shims 203, and the workplace 100 of its upper surface and this screening can 10 is in same plane or same curved surface.
Consult accompanying drawing, each magnetic core unit 20 is installed within the magnetic core seat 214, the madial wall of the two sides of this magnetic core seat 214 and this screening can 10 respectively is provided with a pad 215, by this pad 215 magnet base 214 is fixed within this screening can 10, thereby realizes installing and fixing of this magnet unit 20.
In the foregoing description, with double magnetic circuit magnetic core unit is that example describes the utility model, yet, it will be appreciated by those skilled in the art that ground, magnetic core of the present utility model unit is not limited to double magnetic circuit magnetic core unit, also can be single magnetic circuit magnetic core unit, when this magnetic core unit is single magnetic circuit magnetic core unit, place, head gap in this magnetic core unit is provided with permanent magnet, thereby produces the magnetic line of force that constant basis is arranged in the magnetic circuit of magnetic core unit.
The transition inclined-plane 102 that this screening can 10 is positioned at these workplace 100 both sides is formed with some grooves 103 along its length direction, the thin dentation projection that these grooves 103 match on cash inspecting machine is combined closely, eliminated the workplace 100 and the step that the high infraversion malposition in the junction of cash inspecting machine forms of magnetic head, bank note has been imported, derived workplace 100 smoothly.By the effect of groove 103, effectively prevent the bank note jam on magnetic head, when having guaranteed currency examine bank note to walk paper money smooth and easy.
Shown in Fig. 6 a to Fig. 6 c, so that principle of work of the present utility model to be described.
By the permanent magnet 213 that is arranged at head gap place, and in these magnetic core unit 20 formed magnetic circuits, produce the magnetic line of force of constant basis.Shown in Fig. 6 a, when not detecting, the magnetic line of force in the magnetic circuit does not change, and magnetic flux is invariable, so the influence electricity kinetic potential produces, fails output voltage signal; Shown in Fig. 6 b, when object P(to be detected such as bank note or check) when passing through magnetic core unit 20, soft magnetic material on it is with the magnetic line of force partial short-circuit of permanent magnet 213 surfaces, magnetic line of force redistribution around this permanent magnet 213, thereby cause the magnetic line of force in the magnetic circuit to change, magnetic flux also changes thereupon, thus there is induction electromotive force to produce, and output voltage signal; Shown in Fig. 6 c, when object P process magnetic core to be detected unit 20, retentive material on it has remanent magnetism, thereby change this permanent magnet 213 distribution of the magnetic line of force on every side, and cause the magnetic line of force in the magnetic circuit to change, magnetic flux also changes thereupon, thus there is induction electromotive force to produce, and output voltage signal.Detected voltage signal is after circuit amplifies, and the central processing unit that is sent to currency examine equipment forms magnetic image and analysis, to differentiate the true and false of the object that detected.
The following describes the making flow process of magnetic head disclosed in the utility model.
At first, 2 first binding posts 207 are inserted in respectively on first coil holder 205,2 second binding posts 210 are inserted in respectively on second coil holder 208, re-use winder and form first coil 206 and second coil 209 respectively at coiling enameled wire on this first coil holder 205 and second coil holder 208, and 2 first binding posts 207 are connected to the two ends of first coil 206,2 second binding posts 210 are connected to the two ends of second coil 209.
Then, magnetic sheet 204, first coil block (being made of first coil holder 205, first coil 206 and first binding post 207), second coil block (being made up of second coil holder 208, second coil 209 and second binding post 210) and permanent magnet 213 in the magnetic sheet 202 in first magnetic core 200, second magnetic core 201, first, spacer shims 203, second are installed the structure shown in the foregoing descriptions be installed within the magnetic core seat 214, and use laser to weld and constitute a magnetic core unit 20.
Subsequently, the magnetic core unit 20(of predetermined quantity for example is 16 in the above-described embodiments) be arranged in order these screening can 10 inside of packing into, and between the madial wall of the two sides of this magnetic core seat 214 and screening can 10, insert pad 215, thereby magnetic core unit 20 tentatively is fixed within this screening can 10.
Use resin to inject among the screening can 10, and hot setting and play the effect of further fixed magnetic core unit 20, re-use flat-grinding machine and magnetic sheet 202, spacer shims 203, permanent magnet 213 and screening can 10 in first are ground to together form same plane, to form the workplace of magnetic head.
Next, prior to welding pin 212 on the circuit board 211, and then first binding post 207 and second binding post 210 of magnetic core unit 20 be welded into circuit board 211.
At last, cover the back shroud of screening can 10, pin 212 stretches out from the window of back shroud, and uses the laser bonding back shroud, thereby finishes making of the present utility model.
In sum, magnetic head disclosed in the utility model, its place, head gap in the magnetic core unit is provided with permanent magnet, thereby in the magnetic circuit of this magnetic core unit, produce the magnetic line of force of constant basis, like this, soft magnetic material on the object to be detected or retentive material all can cause the layout again of the magnetic line of force in the magnetic circuit, cause the variation of magnetic flux, produce induction electromotive force and output detection signal, make the utility model can compatible carry out the detection of soft or hard magnetic characteristic signal, than prior art, the utility model only increases the setting of permanent magnet, has simple in structure, the advantage of stable performance.
The above only is a preferred embodiment of the present utility model, but not the utility model is done any pro forma restriction.Those skilled in the art can impose various changes that are equal to and improvement on the basis of the foregoing description, all equivalent variations or modifications of being done in the claim scope all should fall within the protection domain of the present utility model.
Claims (10)
1. the magnetic head of a compatible soft or hard magnetic characteristic input, include a screening can and at least one magnetic core unit that is arranged in the described screening can, it is characterized in that: each place, head gap thereon, described magnetic core unit respectively is provided with a permanent magnet, and produces the magnetic line of force that constant basis is arranged in each magnetic circuit of described magnetic core unit.
2. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 1 is characterized in that: set magnetic core unit is a plurality of, is provided with an electromagnetic shielding plate between the two adjacent magnetic core unit.
3. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 2 is characterized in that: set magnetic core unit is 16, and each effective core length in magnetic core unit is 11.6mm, and the spacing between the adjacent two magnetic core unit is 0.2mm.
4. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 1 is characterized in that: each magnetic core unit is installed within the magnetic core seat.
5. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 4 is characterized in that: the two sides of described magnetic core seat and the madial wall of described screening can respectively are provided with pad.
6. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 1 is characterized in that: the transition inclined-plane that described screening can is positioned at its workplace both sides is formed with some grooves along its length.
7. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 1, it is characterized in that: described magnetic core unit is double magnetic circuit magnetic core unit, it includes one first magnetic core and one and second magnetic core that is oppositely arranged of described first magnetic core, be provided with magnetic sheet in one first between described first magnetic core and second magnetic core, and be provided with a spacer shims separately between the magnetic sheet in both upper ends and described first, and be provided with in one second magnetic sheet in both bottoms and described first between the magnetic sheet separately or directly be contacted with magnetic sheet in described first, described first magnetic core is arranged with one first coil by one first coil holder, the two ends of described first coil are connected with one first binding post separately, described second magnetic core is arranged with one second coil by one second coil holder, the two ends of described second coil are connected with one second binding post separately, described first binding post and second binding post connect into the circuit board of described magnetic core unit, and lead to the pin that stretches out in outside the described screening can from described circuit board.
8. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 7 is characterized in that: described first magnetic core and second magnetic core all are set to the structure of コ shape.
9. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 8 is characterized in that: described permanent magnet fits in the place, another side with respect to magnetic sheet in described first of corresponding spacer shims.
10. the magnetic head of compatible soft or hard magnetic characteristic input as claimed in claim 1 is characterized in that: the upper surface of described permanent magnet and the workplace of described screening can are in same plane or same curved surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207082649U CN203102426U (en) | 2012-12-20 | 2012-12-20 | Magnetic head capable of detecting soft and hard magnetic feature signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207082649U CN203102426U (en) | 2012-12-20 | 2012-12-20 | Magnetic head capable of detecting soft and hard magnetic feature signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203102426U true CN203102426U (en) | 2013-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012207082649U Withdrawn - After Issue CN203102426U (en) | 2012-12-20 | 2012-12-20 | Magnetic head capable of detecting soft and hard magnetic feature signals |
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|---|---|
| CN (1) | CN203102426U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103886669A (en) * | 2012-12-20 | 2014-06-25 | 深圳粤宝电子工业总公司 | Compatible soft/hard magnetic characteristic signal detection magnetic head |
| CN104361671A (en) * | 2014-11-03 | 2015-02-18 | 苏州保瑟佳货币检测科技有限公司 | Magnetic sensor and magnetic detection method and system based on same |
-
2012
- 2012-12-20 CN CN2012207082649U patent/CN203102426U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103886669A (en) * | 2012-12-20 | 2014-06-25 | 深圳粤宝电子工业总公司 | Compatible soft/hard magnetic characteristic signal detection magnetic head |
| CN103886669B (en) * | 2012-12-20 | 2016-09-07 | 深圳粤宝电子科技有限公司 | The magnetic head of compatible soft or hard magnetic characteristic signal detection |
| KR101930881B1 (en) | 2012-12-20 | 2018-12-19 | 센젠 유예바오 일렉트로닉 테크놀러지 컴퍼니 리미티드 | Magnetic head for detecting soft and hard magnetic characteristic signals |
| CN104361671A (en) * | 2014-11-03 | 2015-02-18 | 苏州保瑟佳货币检测科技有限公司 | Magnetic sensor and magnetic detection method and system based on same |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN YUEBAO ELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER NAME: YUEBAO ELECTRONIC INDUSTRY GENERAL CO., SHENZHEN CITY |
|
| CP03 | Change of name, title or address |
Address after: Buji Town, Shenzhen city of Guangdong Province, Guangdong Road No. 45 518000 Patentee after: SHENZHEN YUEBAO ELECTRONIC TECHNOLOGY CO., LTD. Address before: Buji Town, Longgang District of Shenzhen City, Guangdong Province, Guangdong Road No. 45 518000 Patentee before: Yuebao Electronic Industry General Co., Shenzhen City |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130731 Effective date of abandoning: 20160907 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |