KR20150125919A - Magnetic head for detecting soft and hard magnetic characteristic signals - Google Patents

Abstract

The present invention proposes a magnetic head capable of detecting both a soft magnetic characteristic signal and a hard magnetic characteristic signal and includes at least one shield unit and at least one core unit installed in the shield unit, And a certain amount of magnetic force lines are generated in the intermediate magnetic circuit of the core unit. The soft magnetic material or the hard magnetic material of the object to be detected generates a new array of magnetic force lines in the magnetic circuit and causes a change in magnetic flux and generates an induced electromotive force to output a detection signal. Therefore, according to the present invention, both the soft magnetic characteristic signal and the hard magnetic characteristic signal can be detected. Compared with the conventional technology, the present invention has merits in that only the permanent magnet is additionally installed, and the structure is simple and the performance is stable.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a magnetic head capable of detecting both a soft magnetic characteristic signal and a hard magnetic characteristic signal,

The present invention relates to a magnetic head, and more particularly, to a magnetic head capable of detecting both a soft magnetic characteristic signal and a hard magnetic characteristic signal, and simultaneously reading an anti-falsification signal of a soft magnetic characteristic such as a bill, will be.

In addition to complementing and developing anti-counterfeiting (discrimination) technology, the level of prevention of the total counterfeiting of the banknotes has also been improved qualitatively and has gained remarkable development. For example, the fifth yuan added the anti-counterfeit mark of soft magnetic characteristics on the basis of the anti-counterfeit mark of the soft magnetic characteristics of the fourth yuan, and the counterfeit anti-counterfeit zone of the banknote, And a hard magnetic material and a soft magnetic material are mixed with ink and arranged in a regular rule. A hard magnetic material (i.e., a permanent magnet) refers to a material that is permanently magnetically retained after magnetization. It can sufficiently align the directions of the magnetic domains even after the external magnetic field is removed, and has a very strong residual magnetization. A soft magnetic material refers to a material that can not be permanently magnetized after it is magnetized. It can not coincide with the directions of the magnetic domains after the external magnetic field is removed, and does not have remarkable residual magnetization.

A kind of banknote discriminator used in an institution such as a bank is required to be capable of detecting both a hard magnetic characteristic and a soft magnetic characteristic in order to read a hard magnetic characteristic signal and a soft magnetic characteristic signal of a bill or a check. The magnetic detection structure, which can detect both the soft magnetic characteristics and the soft magnetic characteristics used in the existing type A bill discriminator, generally has an effective magnetic core length of 61 mm or 73 mm, an inductance type magnetic head of a single detection channel, and two to four effective And an antimonide indium semiconductor magnetic head having a magnetic length of 3 to 5 mm. Here, the inductance-type magnetic head is used for detecting a magnetic field characteristic signal of a banknote. When the banknote passes over the working surface of the inductance-type magnetic head, the interval of the magnetic head of the core unit is larger than the magnetic force line And changes the magnetic flux in the magnetic circuit. The coil generates and outputs a corresponding electric signal. However, since the soft magnetic material of the bill has no remarkable residual magnetization, the bill can not change the magnetic flux in the magnetic circuit of the core unit when the bill passes the work surface of the inductance type magnetic head. Therefore, the inductance- It can not be used for the detection of. In addition, although the antimonide indium semiconductor magnetic head can detect both the soft magnetic characteristic signal and the hard magnetic characteristic signal, there is a problem that the detection range is narrow, the price is high, and the stability against the temperature is low. For example, the detection accuracy of the antimonide indium semiconducting magnetic head is drastically reduced in the environment of -20 ° C, and discrimination error frequently occurs.

An object of the present invention is to provide a magnetic head capable of detecting both a soft magnetic characteristic signal and a hard magnetic characteristic signal with stable performance and low cost.

According to an aspect of the present invention, there is provided a magnetic head capable of detecting both a soft magnetic characteristic signal and a hard magnetic characteristic signal. The magnetic head includes at least one shielding unit and at least one core unit installed in the shielding unit. One permanent magnet is provided between the intermediate magnetic heads, and a certain amount of magnetic force lines are generated in the intermediate magnetic circuit of the core unit.

In the magnetic head structure, a plurality of core units are provided, and one electromagnetic shielding plate is provided between two adjacent core units.

In the magnetic head structure, sixteen core units are installed, the effective magnetic core length of the intermediate core unit is 11.6 mm, and the distance between two adjacent core units is 0.2 mm.

In the magnetic head structure, the intermediate core unit is installed inside one core block.

In the magnetic head structure, washers are provided on both side surfaces of the core block and on inner side walls of the shield case.

In the magnetic head structure, the shielding box has a plurality of recesses formed along the longitudinal direction on the switching slopes on both sides of the work surface.

In the magnetic head structure, the core unit is a dual magnetic circuit core unit, and includes one first magnetic core and one second magnetic core provided so as to correspond to the first magnetic core, A first magnetic plate is provided between the second magnetic cores, and one gap film is provided between the upper end of the first magnetic plates and the first magnetic plate, and one gap film is provided between the lower end and the first magnetic plate, 2 magnetic plate or directly contacts the first magnetic plate, the first magnetic core has a first coil inserted through a first coil holder, and a first coil is inserted into both ends of the first coil, And a second coil is inserted into the second magnetic core through a second coil holder, and one second terminal is connected to both ends of the second coil, 1 terminal and the second terminal Is connected to the circuit board of the core unit, are led out from the circuit board has a pin extending from the shield box.

In the magnetic head structure, the first magnetic core and the second magnetic core are both installed in a " co-like " structure.

In the magnetic head structure, the permanent magnet is bonded to the other side corresponding to the first magnetic plate of the corresponding gap film.

In the magnetic head structure, the upper surface of the permanent magnet and the working surface of the shield are located on the same plane or the same curved surface.

A permanent magnet is installed between the magnetic heads of the core unit in the magnetic head, so that a certain amount of magnetic force lines are generated in the magnetic circuit of the core unit. In this case, the soft magnetic material or the hard magnetic material of the object to be detected, Generates a new array, changes the magnetic flux, generates an induced electromotive force, and outputs a detection signal. Therefore, according to the present invention, both the soft magnetic characteristic signal and the hard magnetic characteristic signal can be detected. Compared with the conventional technology, the present invention has merits in that only the permanent magnet is additionally installed, and the structure is simple and the performance is stable.

1 is a three-dimensional structure diagram of the present invention.
2 is an exploded view of the present invention.
3 is a longitudinal sectional view of the present invention.
4 is a cross-sectional view of the present invention.
5 is a structural view of the core unit of the present invention.
Figures 6A, 6B and 6C are schematic operational principles and show the working principle of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments.

The magnetic head capable of detecting both the soft magnetic characteristic signal and the hard magnetic characteristic signal according to the present invention is mainly applied to a banknote discriminating machine and detects whether or not a banknote or a check is falsified. 1 to 5, the magnetic head includes a shield 10 and at least one core unit 20 installed in the shield 10, One opening 101 is formed in the work surface 100 along the longitudinal direction and the core unit 20 is fixed to the inside of the shield box 10. The gap between the magnetic heads corresponds to the opening 101 do.

In the embodiment of the accompanying drawings, the shielding box 10 is provided with 16 core units 20 to constitute a magnetic head having 16 detection channels. The effective magnetic core length of the intermediate core unit 20 is 11.6 mm and the interval between the adjacent two core units 20 is 0.2 mm. Accordingly, the effective detection width of the magnetic head is approximately 188 mm, and it is possible to detect various kinds of bills of various countries. Preferably, in order to prevent electromagnetic interference between adjacent detection channels, an electromagnetic shielding plate 30 is provided between two adjacent core units 20, so that two adjacent core units 20 Spacing.

4 and 5, the core unit 20 shown in the figure includes a first magnetic core 200 as a dual magnetic circuit core unit, and a second magnetic core 200 as a second magnetic core unit And a second magnetic core (201). Here, the first magnetic core 200 is designed to have a substantially "co" -shaped structure, is manufactured using a magnetic material, and preferably uses permalloy; The second magnetic core 201 is also designed to have a substantially "co" -shaped structure, which is manufactured using a magnetic material, and permalloy is preferably used. A first magnetic plate 202 made of a magnetic material (preferably permalloy) is provided between the first magnetic core 200 and the second magnetic core 201, and at the same time, One gap film 203 is provided between the first magnetic plate 202 and the first magnetic plate 202 and one gap film 203 is provided between the lower magnetic pole and the first magnetic plate 202, A magnetic circuit having a magnetic head gap is formed in each of the core units 20. In this case, In the above embodiment, the lower ends of both the first magnetic core 200 and the second magnetic core 201 are in contact with the first magnetic plate 202 through the corresponding second magnetic plates 204, The first magnetic plate 200 and the second magnetic core 201 can be brought into direct contact with the first magnetic plate 202 without the need to provide the second magnetic plate 204 in another embodiment of the present invention. There is also. The first magnetic core 200 is inserted into one first coil 206 through one first coil holder 205 and one end of the first coil 205 is connected to one end of the first coil 205, And the second magnetic core 201 is inserted into one second coil 209 through one second coil holder 208. The second coil 201 is connected to both ends of the second coil 209, The first terminal 207 and the second terminal 210 are connected to the circuit board 211 of the core unit 20 and the core unit 20 is connected to the second terminal 210. [ And has a pin 212 extended from the circuit board 211 and extending from the shield box 10 to output a soft magnetic characteristic signal and a hard magnetic characteristic signal such as a bill, a check or the like.

One permanent magnet 213 is installed at an interval adjacent to the corresponding magnetic head of the first magnetic core 200 and the upper end of the second magnetic core 201. In order to install the permanent magnet 205, A certain amount of magnetic force lines are generated in the intermediate magnetic circuit of the unit 20. In the preferred embodiment of the present invention, the permanent magnet 213 is bonded to the other side of the corresponding gap layer 203 corresponding to the first magnetic plate 202, The working surface 100 is located on the same plane or the same curved surface.

Referring to the attached drawings, the intermediate core unit 20 is installed inside one core block 214 and has a washer (not shown) on both side surfaces of the core block 214 and the inside wall of the shield box 10, And a core block 214 is fixed to the inside of the shielding casing 10 through the washer 215 to thereby fix the core unit 20.

Although the present invention has been described by exemplifying a dual magnetic circuit core unit in the above embodiment, those skilled in the art will recognize that the core unit of the present invention is not limited to a dual magnetic circuit core unit, The core unit may be a magnetic circuit core unit, and when the core unit is a magnetic circuit core unit, a permanent magnet may be provided between the magnetic heads of the core unit, .

A plurality of recesses 103 are formed along the longitudinal direction on the switching slopes 102 located on both sides of the work surface 100 of the shielding case 10 and the recesses 103 are formed in correspondence with the corresponding serrations So that the banknote can smoothly enter and discharge along the work surface 100. In addition, since the work surface 100 of the magnetic head is closely coupled to the protruding portion of the magnetic head, . In addition, the groove 103 effectively prevents the paper money from being caught in the magnetic head, and ensures smooth movement of the paper money when the paper money is discriminated.

Hereinafter, the working principle of the present invention will be described with reference to Figs. 6A to 6C.

A permanent magnet (213) is provided between the magnetic heads, and a magnetic force line is generated in a magnetic circuit formed in the core unit (20). As shown in FIG. 6A, when the magnetic flux is not detected, the magnetic flux lines in the magnetic circuit are not changed, a constant magnetic flux is maintained, no induced electromotive force is generated, and no electric signal is output; 6B, when the detection target P (for example, banknote or check) passes through the core unit 20, the soft magnetic material partially short-circuits the magnetic force lines on the surface of the permanent magnet 213, A magnetic force line around the magnet 213 is newly arranged, a change in magnetic flux lines occurs in the magnetic circuit to cause a change in magnetic flux, an induced electromotive force is generated and an electric signal is output; 6C, when the detection object P passes through the core unit 20, since the residual magnetization exists in the hard magnetic material, the arrangement of the magnetic force lines around the permanent magnet 213 is changed so that the magnetic force lines And a change in the magnetic flux is generated, and an induced electromotive force is generated to output an electric signal. The detected electric signal is transmitted to the CPU of the bill discriminator after amplification of the circuit, forming and analyzing an image, and discriminating whether the object to be detected is counterfeited or not.

Hereinafter, the manufacturing process of the magnetic head according to the present invention will be described.

First, two first terminals 207 are inserted into a first coil holder 205, two second terminals 210 are inserted into a second coil holder 208, respectively, and then a winding machine is used The first coil 206 and the second coil 209 are formed by winding an enamel wire around the first coil holder 205 and the second coil holder 208. At the same time, And the two second terminals 210 are connected to both ends of the second coil 209, respectively.

Next, the first magnetic core 200, the second magnetic core 201, the first magnetic plate 202, the gap film 203, the second magnetic plate 204, The second coil part (constituted by the first coil holder 205, the first coil 206 and the first terminal 207), the second coil part (constituted by the second coil holder 2080, the second coil 2090, The terminal 2100 and the permanent magnet 213 are installed inside the core block 214 and then welded with a laser to constitute one core unit 20.

A predetermined number of core units 20 (for example, 16 in the above embodiment) are installed in the shielding box 10 in order and shielded from both sides of the core block 214 10 by inserting the washer 215 into the inside of the shielding case 10 to temporarily fix the core unit 20 inside the shielding case 10.

The resin is injected into the shield 10 and then cured at a high temperature to fix the core unit 20 further. Thereafter, the first magnetic plate 202, the gap film 203, the permanent magnet 213, The casing 10 is simultaneously polished in one plane to form the working surface of the magnetic head.

The first terminal 207 and the second terminal 210 of the core unit 20 are welded to the circuit board 211 after the fin 212 is first welded to the circuit board 211.

Finally, the rear cover of the shield 10 is closed, the fin 212 is extended through the window of the rear cover, and then the rear cover is laser welded to complete the fabrication process of the present invention.

As described above, according to the magnetic head of the present invention, since a permanent magnet is provided between the magnetic heads of the core unit, a magnetic force line is generated in the magnetic circuit of the core unit. In this case, All cause a new arrangement of the magnetic force lines in the magnetic circuit and cause a change in magnetic flux and generate an induced electromotive force to output a detection signal. Therefore, according to the present invention, both the soft magnetic characteristic signal and the hard magnetic characteristic signal can be detected. Compared with the conventional technology, the present invention has merits in that only the permanent magnet is additionally installed, and the structure is simple and the performance is stable.

The foregoing is merely illustrative of preferred embodiments of the present invention and is not intended to limit the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It is in the scope of protection.

Claims (10)

And a magnetic force line is generated in the intermediate magnetic circuit of the core unit, and a magnetic field is generated in the intermediate magnetic circuit of the core unit, Wherein the magnetic head is capable of detecting both a soft magnetic characteristic signal and a hard magnetic characteristic signal. The method according to claim 1,
Wherein a plurality of the core units are provided, and one electromagnetic shielding plate is provided between two adjacent core units. 3. The method of claim 2,
Wherein the number of the core units is 16, the effective core length of the core unit is 11.6 mm, and the distance between two adjacent core units is 0.2 mm. Magnetic head. The method according to claim 1,
Wherein the intermediate core unit is installed inside a single core block. 5. The method of claim 4,
Wherein a washer is provided on both side surfaces of the core block and the inner wall of the shield case, wherein the washer is capable of detecting both the soft magnetic characteristic signal and the hard magnetic characteristic signal. The method according to claim 1,
Characterized in that the shielding box has a plurality of recesses formed along the longitudinal direction on the switching slopes on both sides of the work surface, and is capable of detecting both the soft magnetic characteristic signal and the hard magnetic characteristic signal. The method according to claim 1,
Wherein the core unit is a dual magnetic circuit core unit and includes one first magnetic core and one second magnetic core provided so as to correspond to the first magnetic core, and between the first magnetic core and the second magnetic core One first magnetic plate is provided and one gap film is provided between the upper end of each of them and the first magnetic plate and one second magnetic plate is provided between the lower end and the first magnetic plate, The first magnetic core directly contacts with the first magnetic plate, the first magnetic core inserts a first coil through one first coil holder, and one first terminal is connected to each of both ends of the first coil And the second magnetic core has one second coil inserted through one second coil holder and one second terminal is connected to both ends of the second coil, Is mounted on the circuit board of the core unit Results and, is drawn from the circuit board the shielding also the soft magnetic properties and light signal detectable magnetic head, both the magnetic properties, characterized in that the signal having a pin extending from. 8. The method of claim 7,
Wherein both the first magnetic core and the second magnetic core are installed in a " co-like " structure. 9. The method of claim 8,
Wherein the permanent magnet is bonded to the other side of the corresponding gap film corresponding to the first magnetic plate, and wherein both the soft magnetic characteristic signal and the hard magnetic characteristic signal are detectable. The method according to claim 1,
Wherein the upper surface of the permanent magnet and the working surface of the shielding box are located on the same plane or the same curved surface.

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