CN113393609B - Currency detecting magnetic head - Google Patents
Currency detecting magnetic head Download PDFInfo
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- CN113393609B CN113393609B CN202110841261.6A CN202110841261A CN113393609B CN 113393609 B CN113393609 B CN 113393609B CN 202110841261 A CN202110841261 A CN 202110841261A CN 113393609 B CN113393609 B CN 113393609B
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- noise
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- banknote
- magnetic
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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
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- General Physics & Mathematics (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Abstract
The invention discloses a banknote checking magnetic head, which comprises a shielding shell and a plurality of detection units arranged in the shielding shell, wherein each detection unit comprises a noise generation loop unit and a reading signal generation loop unit, the shielding shell is provided with a working surface along the length direction, and the working surface is provided with an opening communicated with the inner cavity of the shielding shell; the upper end of the reading signal generating loop unit penetrates through the opening and is flush with the working surface, and a gap is reserved between the upper end of the noise generating loop unit and the working surface. In the invention, the upper end of the reading signal generation loop unit is penetrated in the opening and is flush with the working surface, and a gap is arranged between the upper end of the noise generation loop unit and the working surface, so that the same magnetic signal generated by the banknote is read only once by the reading signal loop unit during banknote detection, thereby avoiding the problem of distortion of the output magnetic signal caused by repeated reading of the magnetic signal of the banknote.
Description
Technical Field
The invention relates to the technical field of banknote checking equipment, in particular to a banknote checking magnetic head.
Background
Compared with expensive semiconductor MR and TMR currency detecting magnetic heads, the traditional coil inductance currency detecting magnetic head has the advantages of low price, stable performance, long service life and the like, and is widely used by domestic currency detectors. However, because the high-power motor, the switching power supply and the like are arranged in the banknote validator, larger electromagnetic interference can be generated, the traditional coil inductance type banknote validator magnetic head is designed to form differential output by double slits and double magnetic circuits, and electromagnetic interference noise generated by the banknote validator motor and the like is restrained through a common mode so as to meet the signal-to-noise ratio requirement of the banknote validator. The problem of the traditional coil inductance type banknote detecting magnetic head is that the same magnetic signal on the banknote is read 2 times by the double slits of the magnetic head in sequence during banknote detection, the magnetic head outputs double composite signals, when 16 detection units are arranged on the magnetic head, 16 magnetic signals are originally arranged on the banknote, 32 magnetic signals are output by the double slits of the traditional coil inductance type magnetic head in a reading combination mode, and the output signals are seriously distorted.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
The invention aims to solve the technical problems that aiming at the defects of the prior art, the invention provides a banknote detecting magnetic head so as to solve the problem that the output magnetic signal is seriously distorted due to the fact that the traditional coil inductance banknote detecting magnetic head in the prior art is designed into a double-slit double-magnetic circuit structure for meeting the signal-to-noise ratio.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the banknote checking magnetic head comprises a shielding shell and a plurality of detection units arranged in the shielding shell, wherein the detection units comprise a noise generation loop unit and a reading signal generation loop unit, and the banknote checking magnetic head is characterized in that the shielding shell is provided with a working surface along the length direction, and the working surface is provided with an opening communicated with the inner cavity of the shielding shell; the upper end of the reading signal generating loop unit penetrates through the opening and is flush with the working surface, and a gap is reserved between the upper end of the noise generating loop unit and the working surface.
The banknote detecting magnetic head is characterized in that a gap between the upper end of the noise generating loop unit and the working surface is more than or equal to 2mm.
The banknote detecting magnetic head, wherein the reading signal generating loop unit comprises a signal reading component and a signal output component arranged on the reading component.
The banknote detecting magnetic head comprises a signal magnetic core, a signal gap piece and a middle magnetic plate, wherein the signal gap piece is positioned between the signal magnetic core and the middle magnetic plate, and the upper ends of the signal magnetic core, the signal gap piece and the middle magnetic plate are positioned in the opening and are flush with the working surface.
The banknote detecting magnetic head comprises a signal coil frame, a signal coil and two signal binding posts, wherein the signal coil frame is sleeved on the signal magnetic core, the signal coil is wound on the signal coil frame, and two ends of the signal coil are correspondingly connected with the two signal binding posts respectively.
The banknote detecting magnetic head, wherein the noise generating loop unit comprises a noise reading component and a noise output component arranged on the noise reading component.
The banknote detecting magnetic head comprises a noise magnetic core, a noise gap piece and a middle magnetic plate, wherein the noise gap piece is positioned on one side of the middle magnetic plate, which is opposite to the signal gap piece, the noise gap piece is positioned between the noise magnetic core and the middle magnetic plate, and the upper ends of the noise magnetic core and the noise gap piece are flush and lower than the upper end of the signal reading component.
The banknote detecting magnetic head comprises a noise coil frame, a noise coil and two noise binding posts, wherein the noise coil frame is sleeved on the noise magnetic core, the noise coil is wound on the noise coil frame, and two ends of the noise coil are respectively and correspondingly connected with the two noise binding posts.
The banknote detecting magnetic head is characterized in that a magnetic core seat is arranged in the shielding shell, and the noise generating loop unit and the reading signal generating loop unit are fixedly connected through the magnetic core seat.
The banknote checking magnetic head is characterized in that the inner cavity of the shielding shell is filled with resin.
The beneficial effects are that: in the invention, the upper end of the reading signal generating loop unit is penetrated in the opening and is flush with the working surface, and a gap is arranged between the upper end of the noise generating loop unit and the working surface, so that the same magnetic signal generated by the banknote is read only once by the reading signal loop unit during banknote detection, thereby meeting the signal-to-noise ratio and avoiding the problem of output magnetic signal distortion caused by repeated reading of the magnetic signal of the banknote.
Drawings
FIG. 1 is a schematic diagram of the banknote testing magnetic head according to the present invention;
FIG. 2 is a schematic cross-sectional view of the banknote validator magnetic head according to the present invention;
the marks in the drawings are: 1. a shield case; 10. a detection unit; 2. a read signal generation loop unit; 21. a signal reading assembly; 210. a middle magnetic plate; 211. a signal magnetic core; 212. a signal gap piece; 22. a signal output assembly; 221. a signal line frame; 222. a signal coil; 223. a signal terminal; 3. a noise generation loop unit; 311. a noise core; 312. a noise gap piece; 32. a noise output component; 321. a noise line frame; 322. a noise coil; 323. a noise binding post; 4. a magnetic core seat; 5. a resin; 6. a working surface; 7. a working surface.
Detailed Description
The invention provides a banknote detecting magnetic head, which is used for making the purpose, technical scheme and effect of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It should also be noted that in the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus, terms describing the positional relationship in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The invention will be further described by the description of embodiments with reference to the accompanying drawings.
The present embodiment provides a banknote detecting magnetic head, which is applied to a banknote detector, as shown in fig. 1, and includes a shielding shell 1 and a plurality of detecting units 10 disposed in the shielding shell 1, for example, 16 detecting units 10 are provided, so that in the process of detecting a banknote, the detecting units are divided into 16 areas corresponding to 16 areas on the banknote for synchronous detection. As shown in fig. 2, the detecting unit 10 includes a noise generating circuit unit 3 and a reading signal generating circuit unit 2, where the reading signal generating circuit unit 2 and the noise generating circuit unit 3 can both read electromagnetic interference noise generated by an induction motor, a switching power supply, etc. in the banknote validator, and by adjusting the noise generating circuit parameters, the interference noise read and output by the reading signal generating circuit unit 2 and the interference noise read and output by the noise generating circuit unit 3 in the same detecting unit 10 have approximately the same amplitude but opposite polarities, and form differential output common mode suppression to cancel the interference noise, so as to obtain a signal to noise ratio capable of meeting the requirements of the banknote validator.
The shielding shell 1 is provided with a working surface 6 along the length direction, the working surface 6 is arc-shaped, and when the banknote checking magnetic head is used for checking the banknote, the working surface 6 is contacted with the surface of the banknote to detect the banknote. The working surface 6 is provided with an opening 7 communicated with the inner cavity of the shielding shell 1, the opening 7 is in a strip shape, and the length direction of the opening 7 is parallel to the length direction of the working surface 6. The upper end of the reading signal generating circuit unit 2 is arranged in the opening 7 in a penetrating manner and is flush with the working surface 6, and a gap is formed between the upper end of the noise generating circuit unit 3 and the working surface 6, namely, one end of the noise generating circuit unit 3, which is close to the opening 7, is lower than one end of the reading signal generating circuit unit 2, which is positioned in the opening 7, so that the signal generating circuit unit is far away from the working surface 6.
Because the traditional coil inductance type banknote detecting magnetic heads are all contact type magnetic heads, namely the banknote is contacted with the magnetic heads during banknote detection, when the banknote passes by the working face 6 of the magnetic heads, the magnetic heads can stably and maximally read and output banknote detecting signals, and when the banknote is far away from the working face 6 of the magnetic heads, the amplitude of the magnetic signals output by the magnetic heads is attenuated in geometric level. Especially when the banknote is more than 2mm from the working surface 6, the magnetic head has little to no way to read the magnetic signal on the banknote. Therefore, when the banknote detecting magnetic head is used for detecting banknote, the reading signal generating circuit unit 2 is flush with the working surface 6, so that the reading signal generating circuit unit 2 can read magnetic signals on the banknote and electromagnetic interference noise generated by an induction motor, a switching power supply and the like; the noise generating circuit unit 3 is far away from the working surface 6, so that the noise generating circuit unit 3 can only read electromagnetic interference noise generated by an induction motor, a switching power supply and the like, but cannot read magnetic signals of the banknote, and thus, when the banknote is detected, the magnetic signals of the banknote are read once only by the reading signal generating circuit unit 2, for example, when the number of the detecting units 10 is 16, the magnetic signals of the banknote are read once only by the 16 reading signal generating circuit units 2, and the banknote detecting magnetic head only outputs 16 magnetic signals, so that real magnetic signals on the banknote can be accurately read, the banknote detecting machine can avoid distortion of the output magnetic signals while obtaining a signal-to-noise ratio meeting the requirement, and the stability and compatibility of the banknote detecting magnetic head for detecting the banknote are improved.
Further, the gap between the upper end of the noise generation circuit unit 3 and the working surface 6 is greater than or equal to 2mm, so that the noise generation circuit unit 3 is far enough away from the banknote during banknote detection, the noise generation circuit unit 3 can hardly detect magnetic signals, the magnetic signals of the banknote can be read only once by the reading signal generation circuit unit 2 to the maximum extent, and the banknote detection magnetic head can accurately read the magnetic signals on the banknote.
In the invention, the upper end of the reading signal generating circuit unit 2 is arranged in the opening 7 in a penetrating way and is flush with the working surface 6, and a gap is reserved between the upper end of the noise generating circuit unit 3 and the working surface 6, so that the same magnetic signal generated by the banknote is read only once by the reading signal circuit unit during banknote detection, thereby meeting the signal-to-noise ratio and avoiding the problem of distortion of the output magnetic signal caused by repeated reading of the magnetic signal of the banknote.
The read signal generating circuit unit 2 includes a signal reading unit 21 and a signal output unit 22 provided on the signal reading unit 21. When detecting the banknote, the signal reading component 21 is used as a signal acquisition working end to read magnetic signals and electromagnetic interference noise on the banknote, and the signal output component 22 outputs the magnetic signals and the electromagnetic interference noise to the banknote detecting machine to be amplified and then to the central processing unit of the banknote detecting machine to form magnetic images and analyze and identify the authenticity of the detected banknote. Specifically, the signal reading component 21 includes a signal magnetic core 211, a signal gap piece 212, and a middle magnetic plate 210, the signal gap piece 212 is located between the signal magnetic core 211 and the middle magnetic plate 210, and the signal magnetic core 211, the signal gap piece 212, and the middle magnetic plate 210 form a signal reading working end, and the signal obtaining working end is located in the opening 7 and is flush with the working surface 6, and during banknote detection, the signal obtaining working end simultaneously obtains magnetic signals on the banknote and electromagnetic interference noise generated by an induction motor, a switching power supply, and the like. The signal output assembly 22 includes a signal wire frame 221, a signal coil 222, and two signal terminals 223, the signal wire frame 221 is sleeved on the signal magnetic core 211, the signal coil 222 is wound on the signal wire frame 221, and two ends of the signal coil 222 are respectively connected with the two signal terminals 223 correspondingly. The side of the shielding shell 1, which is far away from the opening 7, is provided with a first through hole for the signal binding post 223 to pass through, and the signal binding post 223 passes through the first through hole to be connected with an internal circuit of the banknote validator.
The noise generation circuit unit 3 includes a noise reading section 31 and a noise output section 32 provided on the noise reading section 31. When detecting paper money, the noise reading component 31 is used as a noise working end, and a certain distance is reserved between the working end and the working surface 6 on the shielding shell 1, so that the noise working end can only acquire electromagnetic interference noise generated by an induction motor, a switching power supply and the like, but cannot acquire magnetic signals, and the noise output component 32 outputs the electromagnetic interference noise to an internal circuit of the paper money detector. The noise reading component 31 includes a noise core 311, a noise gap piece 312, and the middle magnetic plate 210, and it can be seen that the middle magnetic plate 210 is a component of the noise generation loop unit 3 and a component of the reading signal generation loop unit 2; the noise gap piece 312 is located on a side of the middle magnetic plate 210 facing away from the signal gap piece 212, the noise gap piece 312 is located between the noise core 311 and the middle magnetic plate 210, and upper ends of the noise core 311 and the noise gap piece 312 are flush and lower than an upper end of the signal reading component 21. The noise core 311, the noise gap piece 312, and the middle magnetic plate 210 form the noise working end, and the noise working end only obtains electromagnetic interference noise generated by an induction motor, a switching power supply, and the like on the banknote during banknote verification. The noise output assembly 32 comprises a noise coil holder 321, a noise coil 322 and two noise binding posts 323, the noise coil holder 321 is sleeved on the noise magnetic core 311, the noise coil 322 is wound on the noise coil holder 321, and two ends of the noise coil 322 are respectively connected with the two noise binding posts 323 correspondingly. The side of the shielding shell 1, which is far away from the opening 7, is provided with a second through hole for the noise binding post 323 to pass through, and the noise binding post 323 passes through the second through hole to be connected with an internal circuit of the banknote validator.
A magnetic core seat 4 is arranged in the shielding shell, and the noise generation loop unit 3 and the reading signal generation loop unit 2 are fixedly connected through the magnetic core seat 4. By providing the core holder 4, the noise generation circuit unit 3 and the read signal generation circuit unit 2 can be stably fixed in the shield case 1. Further, the inner cavity of the shielding shell 1 is filled with resin 5, for example, the resin 5 is epoxy resin 5. The resin 5 serves to further fix the noise generation circuit unit 3 and the read signal generation circuit unit 2 while having a moisture-proof effect.
The shielding shell 1 carries out arc rough grinding and fine grinding process treatment on the working surface 6 in the manufacturing process to form a smooth working surface 6 so as to reduce banknote travelling friction resistance.
In summary, the invention discloses a banknote testing magnetic head, which comprises a shielding shell and a plurality of detection units arranged in the shielding shell, wherein each detection unit comprises a noise generation loop unit and a reading signal generation loop unit, the shielding shell is provided with a working surface along the length direction, and the working surface is provided with an opening communicated with an inner cavity of the shielding shell; the upper end of the reading signal generating loop unit penetrates through the opening and is flush with the working surface, and a gap is reserved between the upper end of the noise generating loop unit and the working surface. In the invention, the upper end of the reading signal generation loop unit is penetrated in the opening and is flush with the working surface, and a gap is arranged between the upper end of the noise generation loop unit and the working surface, so that the same magnetic signal generated by the banknote is read only once by the reading signal loop unit during banknote detection, thereby avoiding the problem of distortion of the output magnetic signal caused by repeated reading of the magnetic signal of the banknote.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The banknote checking magnetic head comprises a shielding shell and a plurality of detection units arranged in the shielding shell, wherein the detection units comprise a noise generation loop unit and a reading signal generation loop unit, and the banknote checking magnetic head is characterized in that the shielding shell is provided with a working surface along the length direction, and the working surface is provided with an opening communicated with the inner cavity of the shielding shell; the upper end of the reading signal generation loop unit is penetrated in the opening and is level with the working surface, and a gap is reserved between the upper end of the noise generation loop unit and the working surface;
and a gap between the upper end of the noise generation loop unit and the working surface is more than or equal to 2mm, so that a signal generated by the banknote is read only once by the reading signal generation loop unit.
2. A banknote validator magnetic head as claimed in claim 1 wherein said read signal generating circuit unit includes a signal reading assembly and a signal output assembly provided on said reading assembly.
3. A banknote validator magnetic head as claimed in claim 2 wherein said signal reading assembly includes a signal core, a signal gap piece and a middle magnetic plate, said signal gap piece being located between said signal core and said middle magnetic plate, and upper ends of said signal core, said signal gap piece and said middle magnetic plate being located in said opening and flush with said working surface.
4. A banknote testing magnetic head according to claim 3, wherein said signal output assembly comprises a signal bobbin, a signal coil and two signal terminals, said signal bobbin is sleeved on said signal magnetic core, said signal coil is wound on said signal bobbin, and two ends of said signal coil are respectively connected with two of said signal terminals.
5. A banknote validator magnetic head as claimed in claim 3 wherein said noise producing loop unit includes a noise reading assembly and a noise output assembly provided on said noise reading assembly.
6. The banknote validator magnetic head as claimed in claim 5 wherein said noise read assembly includes a noise core, a noise gap piece and said middle magnetic plate, said noise gap piece being located on a side of said middle magnetic plate facing away from said signal gap piece, said noise gap piece being located between said noise core and said middle magnetic plate with upper ends of said noise core and said noise gap piece being flush and lower than an upper end of said signal read assembly.
7. The banknote detecting magnetic head according to claim 6, wherein the noise output assembly comprises a noise bobbin, a noise coil and two noise binding posts, the noise bobbin is sleeved on the noise magnetic core, the noise coil is wound on the noise bobbin, and two ends of the noise coil are respectively connected with the two noise binding posts correspondingly.
8. The magnetic head according to claim 1, wherein a magnetic core seat is provided in the shield case, and the noise generation circuit unit and the reading signal generation circuit unit are fixedly connected through the magnetic core seat.
9. The banknote validator magnetic head as claimed in claim 1 wherein said interior cavity of said shield housing is filled with resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110841261.6A CN113393609B (en) | 2021-07-22 | 2021-07-22 | Currency detecting magnetic head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110841261.6A CN113393609B (en) | 2021-07-22 | 2021-07-22 | Currency detecting magnetic head |
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| Publication Number | Publication Date |
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| CN113393609A CN113393609A (en) | 2021-09-14 |
| CN113393609B true CN113393609B (en) | 2023-06-02 |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3172376B2 (en) * | 1994-10-03 | 2001-06-04 | アルプス電気株式会社 | Magnetic head |
| JPH11203631A (en) * | 1998-01-06 | 1999-07-30 | Sony Corp | Magneto-resistive magnetic head and recording and reproducing device using it |
| JP2000099788A (en) * | 1998-09-18 | 2000-04-07 | Toshiba Corp | Magnetic head device and discrimination device |
| JP5705516B2 (en) * | 2010-11-30 | 2015-04-22 | 日本電産サンキョー株式会社 | Card reader |
| KR101553092B1 (en) * | 2010-12-10 | 2015-09-14 | 니혼 덴산 산쿄 가부시키가이샤 | Magnetic pattern detecting device |
| CN202058444U (en) * | 2011-05-11 | 2011-11-30 | 北京泰和磁记录制品有限公司 | Magnetic head |
| CN104471355B (en) * | 2012-07-06 | 2016-12-14 | 北京磊岳同泰电子有限公司 | Chip type magnetic sensor |
| JP2015197687A (en) * | 2014-03-31 | 2015-11-09 | 日本電産サンキョー株式会社 | Magnetic field generator, magnetic recording medium processing device, and control method of the magnetic recording medium processing device |
| CN206058358U (en) * | 2016-09-08 | 2017-03-29 | 深圳粤宝电子科技有限公司 | Currency examination magnetic head |
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