CN2439016Y - Bank note magnetic sensor - Google Patents
Bank note magnetic sensor Download PDFInfo
- Publication number
- CN2439016Y CN2439016Y CN00211346U CN00211346U CN2439016Y CN 2439016 Y CN2439016 Y CN 2439016Y CN 00211346 U CN00211346 U CN 00211346U CN 00211346 U CN00211346 U CN 00211346U CN 2439016 Y CN2439016 Y CN 2439016Y
- Authority
- CN
- China
- Prior art keywords
- magnetic
- magnetic head
- head
- paper money
- magnetic sensor
- Prior art date
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a magnetic sensor, particularly a magnetic sensor for a forged bank note recognizer (bank note count machine). The magnetic sensor is composed of a magnetic head and a magnetizer, wherein, the magnetic head is a magnetic head of a common recorder or a special purpose long-gap magnetic head. The magnetizer is a current magnetizer or a magnetizer with permanent magnet. A bank note magnetic sensor formed by organically combining the magnetic head and the magnetizer solves the problems that the sensitivity of the common sensor is not high or the anti-counterfeiting efficacy is dead, etc. The magnetic sensor for a forged bank note recognizer has the good properties of high confidence level, low cost, and small volume, and can be used in the forged bank note recognizer and can enhance the performance of the forged bank note recognizer.
Description
The utility model relates to a kind of Magnetic Sensor, particularly relates to the Magnetic Sensor that uses in a kind of discriminating machine for fake RMB (paper money counter).
Financial sector need be differentiated the true and false of banknote.One of method commonly used is a magnetic false distinguishing method, promptly detects magnetisable material (being called for short paper money magnetic) on the banknote with Magnetic Sensor in identifier, and what paper money magnetic was arranged is genuine notes, no paper money magnetic be counterfeit money.The Decree of Patent Office of China, the patent No. is 922121257 " currency Discr.s "; The patent No. is 932169945 " pen type counterfeit money recognizers "; The patent No. is 932298796 " miniature difunctional counterfeit money recognizers ", has all put down in writing the technical scheme of surveying paper money magnetic with head, but it is not high to measure sensitivity.Reason is to introduce impressed current with excitatory resistance to give magnetic head excitatory in its technical scheme, and this excitatory resistance is a load of magnetic head signal.Its existence has strengthened the pressure drop of magnetic signal in the magnetic head internal resistance, and effectively the amplitude of output has diminished, thereby makes sensitivity not high.The patent No. is 95231987X " a kind of permanent magnetism magnetic head ", has also put down in writing the technical scheme of surveying paper money magnetic with head.But different with preceding several patents, the technical scheme that improves sensitivity is (or in magnetic head body) sticking lastblock permanent magnet pieces on head shell, makes magnetic head body and gathering throat form permanent-magnetic field.This scheme has higher sensitivity, but have 2 unsatisfactory.The one, the magnetic head body easily attracts to go up iron filings, and counterfeit identifying function was lost efficacy.The 2nd, diamagnetic interference capability is not strong, has reduced the confidence level of paper money counter false distinguishing.
The purpose of this utility model provides a kind of Magnetic Sensor.It does not use excitatory resistance, not sticking permanent magnet pieces on magnetic head.And have higher sensitivity, reliably false distinguishing performance and a lower cost.
The purpose of this utility model is to realize like this.Utilization " magnetization " and " electromagnetic induction " electrical theory organically combines magnetizing apparatus and magnetic head (remanent magnetism detecting device) two parts, forms a paper money Magnetic Sensor.Magnetizing apparatus is preceding, magnetic head after, banknote by the time pass through magnetic head then through magnetizing apparatus earlier.The effect of magnetizing apparatus is with the magnetization of paper money magnetic, makes it to have remanent magnetism.The effect of magnetic head is the remanent magnetism that detects paper money magnetic, converts thereof into electric signal.The ultimate principle that this patent described " paper money Magnetic Sensor " detects paper money magnetic is such: no matter whether paper money magnetic be magnetized in the past, all will be magnetized during by magnetizing apparatus and produce remanent magnetism at it.Paper money magnetic with remanent magnetism causes changes of magnetic field in the magnetic head core when it passes through the gathering throat of magnetic head, according to the Faradic electricity magnetic induction principle, produce induced potential in the magnetic head coil.Induced potential as magnetic signal output, judges that having or not magnetic signal just to know has or not magnetisable material, can carry out false distinguishing to banknote thus on the banknote after amplifying.
Magnetizing apparatus can be made of ironcore choke, also can be made of permanent magnet.The former is called the current magnetization device, and the latter is called the permanent magnet magnetization device.Magnetizing apparatus produces is used for magnetized magnetic field, the choosing so that paper money magnetic produces enough remanent magnetism is criterion of its size.Generally can choose 0.05 to 0.15 tesla.Its direction is vertical or parallel with banknote direction of motion.Material to permanent magnet does not have special requirement.Magnetized width should cover the gathering throat of each magnetic head.
Magnetic head can be selected head, magnetic card machine magnetic head, video tape recorder magnetic head for use.Monaural, (each coil serial or parallel connection) multichannel can.Impedance to magnetic head does not have strict requirement, and the magnetic head of Low ESR, middle impedance, high impedance is all right, generally chooses the reproducers head of dc impedance 250 Ω to 550 Ω.The length of preceding two kinds of head chips is shorter, needs multihead (more than two) and use together sometimes.The length of a kind of head chip in back is longer, helps improving the confidence level of false distinguishing.But feel still that sometimes length is not enough, can redesign and make the very long special-purpose magnetic head of gathering throat, perhaps head, magnetic card machine magnetic head, video tape recorder magnetic head are transformed into the very long special-purpose magnetic head of gathering throat for addressing this problem.Below be referred to as " long crack magnetic head ".Determining of long crack head chip length can touch still with the tested banknote duration crack that swings that the tested magnetisable material of appointment is a criterion on the banknote, also can determine the length in long crack according to actual needs, not the regulation of strictness.Long crack magnetic head has highly sensitive, and the good characteristic of not omission (not being afraid of paper money magnetic swings along working direction) can improve the confidence level of false distinguishing greatly.
This paper money Magnetic Sensor can be made into the whole split that also can be made into.Distance to both during split does not have strict requirement.The distance of current magnetization device and magnetic head can be very near, because do not attract the problem of iron filings, but will guarantee that exciting curent does not disturb the detection of magnetic head, answers between to add magnetic shielding in case of necessity.The current magnetization device is suitable for making whole paper money Magnetic Sensor.Have compact and easy-to-install characteristics.It is too near that the distance of permanent magnet magnetization device and magnetic head is difficult for, otherwise magnetic head can be subjected to the interference of magnetizing apparatus, should take suitable magnetic shielding when making whole paper money Magnetic Sensor with it.
Provide embodiment of the present utility model (split type) below, and be described below in conjunction with Fig. 1, Fig. 2, Fig. 3.
Fig. 1 is the magnetizing apparatus of a split type paper money Magnetic Sensor.(1) fixed orifice wherein, (2) magnetizing apparatus shell, (3) permanent magnet, (4) magnetizing apparatus surface, (5) banknote direction of motion, (6) magnetizing apparatus permanent magnet width.Here, magnetizing apparatus is that permanent magnet adds the permanent magnet magnetization device that shell constitutes.The material of permanent magnet is a neodymium iron boron, and magnetic field intensity is 0.1 tesla, and direction upwards.The width of permanent magnet is greater than two clearance distance (12); This magnetizing apparatus (2) and remanent magnetism detecting device (8) constitute the paper money Magnetic Sensor together, during installation, magnetizing apparatus is preceding, and the remanent magnetism detecting device is (banknote elder generation process magnetizing apparatus is after superfluous magnetic detector) in the back, the center of permanent magnet and two head gap center-aligned guarantee that magnetized area covers the slit of two magnetic heads.Distance between magnetizing apparatus and the magnetic head does not have strict regulation, mechanically to be installed as criterion easily.To guarantee that mechanically magnetizing apparatus surface (4) is close to by banknote and head surface (10) passes through, detect to guarantee best magnetization and remanent magnetism.
Fig. 2 is the remanent magnetism detecting device of a split type paper money Magnetic Sensor.(7) banknote direction of motion wherein, (8) remanent magnetism detector housing, (9,15) magnetic head, (10) remanent magnetism detector surface, (11) fixed orifice, the distance between (12) the two head chip outward flanges (being called for short two clearance distance), (13) magnetic head signal pins, (14) head chip.This example has been used two magnetic heads (9,15), and what select for use is the magnetic head of sound-track engraving apparatus with monophony dc impedance 400 Ω.The series connection of two magnetic head coils, series connection back signal draws and gives amplifier with shielded cable, can obtain to have or not the signal of paper money magnetic at its output terminal; This remanent magnetism detecting device (8) and magnetizing apparatus (2) constitute the paper money Magnetic Sensor together, during installation, magnetizing apparatus is preceding, and the remanent magnetism detecting device is (banknote elder generation process magnetizing apparatus is after superfluous magnetic detector) in the back, the center of permanent magnet and two head gap center-aligned guarantee that magnetized area covers the slit of two magnetic heads.Distance between magnetizing apparatus and the magnetic head does not have strict regulation, mechanically to be installed as criterion easily.To guarantee that mechanically magnetizing apparatus surface (4) is close to by banknote and remanent magnetism detector surface (10) is passed through, detect to guarantee best magnetization and remanent magnetism.
In the present embodiment, magnetizing apparatus also can be used the current magnetization device instead.Magnetic head is except that with also available one or more two, except that with also available magnetic card machine magnetic head or video tape recorder magnetic head the head.
Fig. 3 is the embodiment of a long crack magnetic head.It mainly does slit (16) by the farm labourer, iron core (17), and coil (21) constitutes.Also have gathering throat width (18) in addition, coil rack (19), coil go out wire pin (20).This magnetic head is compared with the magnetic head of head, magnetic card machine magnetic head, video tape recorder magnetic head and other purposes, and maximum not being both has a very long gathering throat.This is a kind of special-purpose magnetic head.In order to detect the little literal safety line of new edition Renminbi magnetic, the length (16) in long crack is 60 millimeters in this example.The width of gathering throat (18) is 1 to 5 micron.Coil is 2000 ohm with the enameled wire coiling in 0.05 millimeter in line footpath around back 1KHz impedance.This length crack magnetic head and magnetizing apparatus (do not draw among Fig. 3, see also Fig. 1) constitute the paper money Magnetic Sensor together, and during installation, magnetizing apparatus is preceding, long crack magnetic head after.This paper money Magnetic Sensor has highly sensitive, and the good characteristic of not omission can improve the confidence level of false distinguishing greatly.
Present embodiment is a kind of structure of long crack magnetic head.Remove in addition and can on the basis of head, magnetic card machine magnetic head or video tape recorder magnetic head, make long crack magnetic head through transforming.The method of transforming is to remove the gathering throat of former iron core, overlaps out the farm labourer then on former iron core and does the slit, at last it is encapsulated.
Claims (4)
1. use in the discriminating machine for fake RMB (paper money counter), detect the paper money Magnetic Sensor that has or not magnetisable material on the banknote, this sensor uses magnetic head and permanent magnet, it is characterized in that this paper money Magnetic Sensor is made up of magnetizing apparatus and magnetic head, and magnetizing apparatus is preceding, magnetic head after.
2. paper money Magnetic Sensor according to claim 1 is characterized in that magnetizing apparatus is made of iron-core coil, also can be made of permanent magnet; The big I in magnetizing apparatus magnetic field is chosen between 0.05 to 0.15 tesla, and its direction is vertical or parallel with banknote direction of motion, and the magnetization width should cover the gathering throat of each magnetic head.
3. paper money Magnetic Sensor according to claim 1 is characterized in that magnetic head selects head, magnetic card machine magnetic head, video tape recorder magnetic head for use, dc impedance 250 Ω to 550 Ω; Magnetic head can also be special-purpose long crack magnetic head or the long crack magnetic head of changing a social system with head, magnetic card machine magnetic head, video tape recorder magnetic head, determining of long crack head chip length, with tested banknote swing the duration crack still can touch banknote the time the fixed tested magnetisable material of purport be criterion.
4. paper money Magnetic Sensor according to claim 1, it is whole to it is characterized in that structurally can manufacturing also can the manufacturing of split.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00211346U CN2439016Y (en) | 2000-04-04 | 2000-04-04 | Bank note magnetic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00211346U CN2439016Y (en) | 2000-04-04 | 2000-04-04 | Bank note magnetic sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2439016Y true CN2439016Y (en) | 2001-07-11 |
Family
ID=33578057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00211346U Expired - Fee Related CN2439016Y (en) | 2000-04-04 | 2000-04-04 | Bank note magnetic sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2439016Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456072A (en) * | 2013-08-27 | 2013-12-18 | 无锡乐尔科技有限公司 | Sensor used for identifying magnetic media |
| CN103839320A (en) * | 2012-11-23 | 2014-06-04 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor used for financial counterfeit detection machine and manufacturing method thereof |
| CN103971444A (en) * | 2013-01-29 | 2014-08-06 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor for magnetic detection |
-
2000
- 2000-04-04 CN CN00211346U patent/CN2439016Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103839320A (en) * | 2012-11-23 | 2014-06-04 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor used for financial counterfeit detection machine and manufacturing method thereof |
| CN103971444A (en) * | 2013-01-29 | 2014-08-06 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor for magnetic detection |
| CN103456072A (en) * | 2013-08-27 | 2013-12-18 | 无锡乐尔科技有限公司 | Sensor used for identifying magnetic media |
| CN103456072B (en) * | 2013-08-27 | 2016-11-02 | 无锡乐尔科技有限公司 | A kind of sensor for identifying magnetic medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1675561A (en) | Magnetic field sensor and method for operating said magnetic field sensor | |
| GB2107104A (en) | Coin identification | |
| JP4467646B2 (en) | Magnetic particles, sheets containing such particles, protective documents and methods for detecting such particles | |
| CN104157068A (en) | Magnetic sensor | |
| CN206039695U (en) | Sensor | |
| CN2439016Y (en) | Bank note magnetic sensor | |
| ATE371236T1 (en) | COIN DISTINCTION DEVICE IN WHICH FREQUENCIES OF EDDY CURRENTS ARE MEASURED | |
| CN2596460Y (en) | Sensor for measuring negotiable securities | |
| CN206058358U (en) | Currency examination magnetic head | |
| CN103971444A (en) | Magnetic sensor for magnetic detection | |
| CN104504801B (en) | Bank note soft and hard magnetism anti-fake feature identification system | |
| CN206039694U (en) | Magnetic detector | |
| CN201413541Y (en) | Coin truth detecting device | |
| CN105574982B (en) | A kind of reading chinaware of wound core full bridge structure | |
| CN203673555U (en) | Multi-modal eddy current sensor coin signal collection device | |
| CN205354179U (en) | Coil magnetic core full -bridge structure reads magnetism ware | |
| CN208736925U (en) | A kind of closed-loop current sensors | |
| CN205692265U (en) | A kind of have the bill counter magnetic head adding magnetic function | |
| CN105913544B (en) | It is a kind of that there is the bill counter magnetic head for adding magnetic function | |
| CN104361671B (en) | Magnetic sensor and the Magnetic sensing methods and system based on it | |
| CN2360884Y (en) | Neodymium-iron-boron magnetic sensor | |
| CN203490758U (en) | Sensor used for identifying magnetic medium | |
| CN215833979U (en) | Magnetic head with high-temperature protection | |
| CN208384679U (en) | A kind of RMB safety line anti-counterfeit detecting system | |
| CN204740657U (en) | Counting currency machine magnetic head |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |