JP2007140928A - Paper sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sensor which detects the residual magnetism of paper having a magnetic substance. <P>SOLUTION: The paper sensor 10 comprises: a magnetizing body 11 disposed near a conveyance path R for conveying the paper W having the magnetic substance, and to apply a magnetic field to the conveyed paper W through a magnetizing part 22; and a magnetism detecting part 12 disposed downstream of the magnetizing body on the conveyance path R for detecting through a detection surface 23 a magnetic field produced by the residual magnetism with which the magnetic body of the paper W is charged by the application of the magnetic field by the magnetizing body. The magnetizing part 22 comprises a flat magnetizing surface 24 and a long protruding part 25 that protrudes from the magnetizing surface 24 to the conveyance path R, with its top 25a extending along the direction of conveyance of the paper W in such a manner as to be flush with the detection surface 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a paper sheet detection sensor, and more particularly to a paper sheet detection sensor that detects magnetic characteristics of paper sheets such as banknotes printed with ink containing a magnetic material.

  Generally, when identifying the authenticity of paper sheets such as banknotes, securities, gift certificates, etc., the magnetic properties of characters, figures and symbols printed on the paper sheets with ink containing a magnetic material, etc. A paper sheet detection sensor for detection is used.

  Such a paper sheet detection sensor is disposed on a transport path for transporting paper sheets, and a magnetized body (magnetizing means) and a magnetic detecting element (magnetic detecting means) are placed in a common holder. It is housed and integrated. The magnetized body is composed of, for example, a permanent magnet. This magnetized body forms a holder and applies a magnetic field to the conveyed paper sheet through a magnetized portion formed on a plate facing the transport path. The magnetic detection element is, for example, a magnetic impedance element, and is housed on the downstream side of the magnetized body in the conveyance path. This magnetic detection element detects a magnetic field generated by residual magnetism applied to a magnetic material of a paper sheet through application of a magnetic material through a detection surface formed on the same plate on which the magnetized portion is formed ( For example, see Patent Document 1).

JP 2000-105647 A

  By the way, in the paper sheet detection sensor as described above, since the magnetized body needs a magnetic force of about 1 k gauss, sand iron, iron powder or the like generally adheres to the magnetized portion under an actual environment. Is. When deposits such as iron sand and iron powder adhere to the magnetized part in this way, a part of the paper sheet conveyed through the conveyance path contacts the deposit and moves the deposit. As a result, the magnetic field of the paper sheet applied by the magnetized body greatly fluctuates, and the magnetic detection element detects the fluctuation of the magnetic field and the output changes. As a result, the magnetic field generated by the correct residual magnetism of the paper sheet There was a problem that could not be detected.

  An object of this invention is to provide the paper sheet detection sensor which can detect the residual magnetism of the paper sheet which has a magnetic body favorably in view of the said situation.

  In order to solve the above-mentioned object, a paper sheet detection sensor according to claim 1 of the present invention is disposed in the vicinity of a transport path for transporting a paper sheet having a magnetic material and And a magnetizing means for applying a magnetic field through the magnetizing portion, and a remanent magnetism disposed on the downstream side of the magnetizing means in the vicinity of the conveyance path, and the magnetic material of the paper sheet is charged by the magnetizing means. In a paper sheet detection sensor comprising a magnetic detection means for detecting a generated magnetic field through a detection surface, the magnetized portion protrudes from the magnetized surface toward the conveyance path, Has an elongated projection extending along the transport direction of the paper sheet in a manner that is coplanar with the detection surface.

  A paper sheet detection sensor according to a second aspect of the present invention is the paper sheet detection sensor according to the first aspect, wherein the magnetizing means and the magnetic detection means are housed in the same holder, and the magnetized portion and the detection surface. Is formed on a common plate that constitutes the holder and faces the conveyance path.

  According to a third aspect of the present invention, there is provided the paper sheet detection sensor according to the second aspect, wherein the plate includes a boundary portion between the magnetized surface and the protrusion, and the magnetized surface and the detection. A gentle slope is formed at each boundary portion with the surface.

  According to a fourth aspect of the present invention, there is provided a paper sheet detection sensor which is disposed in the vicinity of a transport path for transporting a paper sheet having a magnetic material and applies a magnetic field to the transported paper sheet through a magnetizing portion. And a magnetic field generated by the residual magnetism of the magnetic material of the paper sheet when applied by the magnetizing means, through the detection surface. In the paper sheet detection sensor comprising a magnetic detection means for detecting, the magnetizing means and the magnetic detection means are housed in the same holder, and the detection surface formed on the same plate as the magnetized portion is Further, it is characterized in that it is formed at a position protruding toward the conveyance path in a mode that becomes the maximum height position.

  A paper sheet detection sensor according to a fifth aspect of the present invention is the paper sheet detection sensor according to the fourth aspect described above, wherein both sides of the magnetized portion and the detection surface of the plate protrude toward the conveyance path, and a top portion is formed. A restricting member extending in the transport direction of the paper sheet is provided in a form that is flush with the detection surface.

  A paper sheet detection sensor according to claim 6 of the present invention is disposed in the vicinity of a transport path for transporting a paper sheet having a magnetic material, and a magnetic field is applied to the transported paper sheet through a magnetizing portion. And a magnetic field generated by the residual magnetism of the magnetic material of the paper sheet when applied by the magnetizing means, through the detection surface. In the paper sheet detection sensor provided with the magnetic detection means for detecting, the both sides of the magnetized part and the detection surface protrude toward the transport path, and the top part of the paper sheet has a maximum height. A restriction member extending along the transport direction is provided.

  A paper sheet detection sensor according to a seventh aspect of the present invention is the paper sheet detection sensor according to the sixth aspect, wherein the magnetizing means and the magnetic detection means are housed in the same holder, and the magnetized portion and the detection surface The regulating member is formed on a common plate that constitutes the holder and faces the conveyance path.

  A paper sheet detection sensor according to an eighth aspect of the present invention is the paper sheet detection sensor according to any one of the first to seventh aspects, wherein the magnetization means has a coercive force greater than or equal to a coercive force of the magnetic material of the paper sheet. It is a permanent magnet having a magnetic field strength.

  A paper sheet detection sensor according to a ninth aspect of the present invention is the sheet detection sensor according to any one of the first to eighth aspects, wherein the magnetic detection means is a thin film fluxgate magnetic detection element or a magnetic impedance element. It is characterized by that.

  According to the paper sheet detection sensor of the present invention, the magnetized portion has a planar magnetized surface, and the paper sheet is protruded from the magnetized surface toward the conveyance path, and the top portion is flush with the detection surface. Since the distance between the magnetized surface and the magnetizing means is shorter than the surface of the projecting portion, the magnetized surface acts on the magnetized surface. The magnetic force to be applied is stronger than that acting on the surface of the protrusion. Therefore, small iron sand, iron powder, etc. floating in the air adhere to the magnetized surface and hardly adhere to the projection surface. As for the projection part, the top part is on the same plane as the detection surface, and there is a risk that the paper sheet being transported will come into contact with the adhering material (sand iron, iron powder, etc.) adhering to the magnetized surface and move the adhering material. There is no. Therefore, the magnetic field of the paper sheet applied by the magnetizing means does not fluctuate greatly, and the residual magnetism of the paper sheet can be detected well.

  Exemplary embodiments of a paper sheet detection sensor according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, a paper sheet detection sensor applied to a paper sheet identification device will be described.

<Embodiment 1>
FIG. 1 schematically shows a paper sheet identification apparatus to which the paper sheet detection sensor according to Embodiment 1 of the present invention is applied. The paper sheet identification device 1 exemplified here is for characters, figures and symbols printed on the paper sheet W with ink containing a magnetic material (hereinafter, these are simply referred to as “magnetic printing unit” as appropriate). It detects magnetic characteristics and the like and identifies the authenticity of the paper sheet W based on the detection result, and is disposed in the vicinity of the transport path R for transporting the paper sheet W. The paper sheet identification apparatus 1 includes an entry sensor 2, a paper sheet detection sensor 10, a paper sheet entry detection unit 3, a magnetic detection unit drive unit 4, and a signal processing circuit 6.

  The approach sensor 2 is disposed in the vicinity of the entrance of the transport path R. The approach sensor 2 is an optical sensor such as a reflective photointerrupter, for example, and detects the entering paper sheet W in a non-contact manner.

  The paper sheet detection sensor 10 is disposed on the downstream side of the approach sensor 2 on the upper side of the transport path R. This paper sheet detection sensor 10 includes a magnetized body (magnetization means) 11 and a magnetic detection section (magnetism detection means) 12, and a magnetic printing section printed on a paper sheet W transported along the transport path R. It detects the amount of magnetism. Details of the paper sheet detection sensor 10 will be described later.

  The paper sheet entry detection unit 3 is connected to the entry sensor 2 and detects the entry of the paper sheet W based on a signal output by the entry sensor 2 detecting the entry of the paper sheet W. is there. The magnetic detection unit drive unit 4 is connected to each of the paper sheet entry detection unit 3 and the magnetic detection unit 12, and outputs a signal output by the paper sheet entry detection unit 3 detecting the entry of the paper sheet W. Based on this, a command signal for driving the magnetism detection unit 12 is output. The signal processing circuit 6 is connected to the magnetic detection unit 12 through the magnetic detection circuit 5, and is compared with a reference value stored in advance based on a detection signal output by the magnetic detection unit 12 detecting a magnetic field. The authenticity of the paper sheet W is determined by determining whether it is within the allowable range.

  2 to 5 show the configuration of the paper sheet detection sensor in FIG. 1, FIG. 2 is a perspective view showing the detection side on the top surface, and FIG. 3 shows the detection side on the top surface. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 is a cross-sectional view taken along line BB in FIG. 2 to 5, the paper sheet detection sensor 10 is configured integrally with a magnetized body 11 and a magnetic detection unit 12 housed in a holder 20.

  The magnetized body 11 is configured, for example, by standing three square columnar permanent magnets 11a, 11b, and 11c in parallel at a predetermined interval along a direction orthogonal to the conveyance direction of the paper sheet W. Is. Here, as the permanent magnets 11a, 11b, and 11c, rare earth magnets having excellent magnetic properties such as samarium / cobalt magnets and neodymium magnets are used. It has strength. The permanent magnet 11a at the center position constituting the magnetized body 11 is erected in such a manner that the detection side (the upper side in FIGS. 2 and 4 and the right side in FIG. 5) is the S pole and the opposite side is the N pole. The permanent magnets 11b and 11c arranged on both sides of the permanent magnet 11a are erected in such a manner that the detection side is the N pole and the opposite side is the S pole. As a result, the magnetized body 11 passes through the transport path R from the north pole, which is the detection side of the permanent magnets 11b, 11c on both sides, to the south pole, which is the detection side of the permanent magnet 11a at the center position. The magnetic printing unit is applied.

  The magnetic detection unit 12 is provided on the downstream side of the magnetized body 11 in the transport path R. The magnetic detection unit 12 is constituted by, for example, a magnetic impedance element or a thin film fluxgate type magnetic detection element. Such a magnetic detection unit 12 is driven in an energized state based on the command signal output from the magnetic detection unit driving unit 4 described above, and is applied by the magnetizing body 11 to magnetically print the paper sheet W. It detects the magnetic field generated by the residual magnetism. Reference numeral 13 denotes a terminal for connecting the magnetic detection unit 12 to the magnetic detection unit driving unit 4 and the magnetic detection circuit 5.

  A magnetic shield member 28 is provided around the magnetic detection unit 12. The magnetic shield member 28 is made of, for example, permalloy, amorphous, or the like, and is for suppressing the magnetic field spreading from the magnetized body 11.

  As described above, the holder 20 is a housing that houses the magnetized body 11, the magnetic detection unit 12, and the like. A top plate 21 is provided on the upper surface side of the holder 20, that is, on the surface (hereinafter also referred to as a detection surface) facing the conveyance path R. The top plate 21 is made of a nonmetallic material such as phosphor bronze. In the top plate 21, a magnetized portion 22 is formed at a site corresponding to the magnetized body 11, and a detection surface 23 is formed at a site corresponding to the magnetic detector 12.

  The magnetized portion 22 includes a magnetized surface 24 and a protrusion 25. The magnetized surface 24 is planar. The protrusion 25 is formed by, for example, drawing or the like, protrudes from the magnetized surface 24 toward the transport path R, and the transport direction of the paper sheet W is such that the top 25a is flush with the detection surface 23. It is a long thing extending along. A gentle slope 26 is formed at the boundary between the projection 25 and the magnetized surface 24. Moreover, the protrusion height of the protrusion 25 is, for example, about 0.2 to 0.5 mm in order to make it larger than small iron sand or iron powder floating in the air that may adhere.

  The detection surface 23 has a planar shape and is at a position protruding from the magnetized surface 24 toward the conveyance path R in a mode having a maximum height together with the top 25a of the protrusion 25. That is, the detection surface 23 constitutes a conveyance path surface together with the protruding portion 25. The protrusion height of the detection surface 23 is about the same as that of the protrusion 25, and is larger than that of the magnetized surface 24 in order to make it larger than small iron sand or iron powder floating in the air that may adhere, for example. The size is about 0.2 to 0.5 mm. A gentle slope 27 is formed at the boundary between the detection surface 23 and the magnetized surface 24.

  The paper sheet identification device 1 to which the paper sheet detection sensor 10 is applied identifies the authenticity of the paper sheet W conveyed as follows.

  When a paper sheet W transported by transport means such as a transport roller or a transport belt, which is not explicitly shown in the drawing, enters the transport path R, the ingress sensor 2 detects it and informs the paper sheet entrance detection unit 3 as a signal to that effect. It is output and it is detected that it entered. When a signal indicating that the paper sheet W has entered the magnetic detection unit drive unit 4 is output from the paper sheet entry detection unit 3, the magnetic detection unit of the paper sheet detection sensor 10 is output from the magnetic detection unit drive unit 4. The drive command is output to 12, and the magnetism detection unit 12 is energized and driven.

  When the paper sheet W that has entered the conveyance path R reaches the region covered by the magnetic field of the magnetized body 11, the paper sheet detection sensor 10 detects the magnetic field generated by the magnetized body 11, that is, the permanent magnets on both sides as shown in FIG. A magnetic field directed from the north poles 11b and 11c toward the south pole of the permanent magnet 11a at the center position is applied through the magnetized portion 22 of the top plate 21 to magnetize the magnetic printing portion of the paper sheet W. The paper sheet W in which the magnetic printing unit is magnetized is conveyed on the conveyance path R as it is.

  Then, the magnetism detection unit 12 in the energized state detects a magnetic field generated by the residual magnetism of the magnetic printing unit, and outputs the detection result as a detection signal to the signal processing circuit 6 through the magnetism detection circuit 5, and then the energized state. Is released and the camera enters a standby state. In the signal processing circuit 6, based on the detection signal output from the magnetic detection unit 12, it is compared with a reference value stored in advance to determine whether it is within a predetermined allowable range, and the authenticity of the paper sheet W is determined. Determine.

  As described above, in the paper sheet detection sensor 10, the magnetic field of the magnetized body 11 is applied to the paper sheet W through the magnetizing unit 22. The magnetized portion 22 has a magnetized surface 24 and a projection 25, and the magnetized surface 24 is closer to the magnetized body 11 (permanent magnets 11a, 11b, 11c) than the surface of the projecting portion 25. Since the distance is short, the magnetic force acting on the magnetized surface 24 is stronger than acting on the surface of the protrusion 25. Therefore, as shown in FIG. 6, the deposit F such as small iron sand or iron powder floating in the air adheres to the magnetized surface 24 and hardly adheres to the surface of the protrusion 25. As described above, the protrusion 25 has the top portion 25a on the same plane as the detection surface 23 and constitutes the conveyance path surface together with the detection surface 23. Therefore, the conveyed paper sheet W adheres to the magnetized surface 24. There is no possibility of moving the deposit F in contact with the deposit F (sand iron, iron powder, etc.).

  Therefore, according to the paper sheet detection sensor 10, there is no possibility that the transported paper sheet W contacts the deposit F attached to the magnetized surface 24 and moves the deposit F. The magnetic field of the paper sheet W applied by the magnetic body 11 does not fluctuate greatly, and the residual magnetism of the paper sheet W can be detected well.

  Further, according to the paper sheet detection sensor 10, the deposit F hardly adheres to the surface of the protruding portion 25, so that the entire surface of the magnetized portion 22 is not covered with the deposit F. The generated magnetic field can be reliably applied to the paper sheet W, and the environment resistance is excellent.

  Further, according to the paper sheet detection sensor 10, the gentle slopes 26 and 27 are formed at the boundary portion between the magnetized surface 24 and the protrusion 25 and the boundary portion between the magnetized surface 24 and the detection surface 23 in the top plate 21. Therefore, there is no possibility that the paper sheet W is caught on the top plate 21 or clogged.

<Embodiment 2>
7 and 8 show the paper sheet detection sensor according to Embodiment 2 of the present invention, respectively. FIG. 7 schematically shows a case when viewed from a direction orthogonal to the paper sheet conveyance direction. FIG. 8 is a cross-sectional view schematically showing a case when viewed from a direction parallel to the paper sheet conveyance direction. In addition, the same code | symbol is attached | subjected to what has the same structure as the paper sheet detection sensor 10 in Embodiment 1 mentioned above, and the description is abbreviate | omitted.

  7 and 8, the paper sheet detection sensor 30 is configured integrally with the magnetized body 11 and the magnetic detection unit 12 housed in the holder 40.

  As described above, the holder 40 is a housing that houses the magnetized body 11, the magnetic detection unit 12, and the like. A top plate 41 is provided on the upper surface side of the holder 40, that is, on the surface side facing the conveyance path R. The top plate 41 is made of a nonmetallic material such as phosphor bronze. In the top plate 41, a magnetized surface 42 (magnetized portion) is formed at a site corresponding to the magnetized body 11, and a detection surface 43 is formed at a site corresponding to the magnetic detector 12.

  The magnetized surface 42 is planar. The detection surface 43 has a planar shape, and is located at a position protruding toward the transport path R from the magnetized surface 42 in a mode having a maximum height. That is, the detection surface 43 constitutes a conveyance road surface. The protruding height of the detection surface 43 is, for example, about 0.2 to 0.5 mm in order to make it larger than small iron sand or iron powder floating in the air that may adhere. A gentle slope 47 is formed at the boundary between the detection surface 43 and the magnetized surface 42.

  In the paper sheet detection sensor 30 having such a configuration, since the detection surface 43 is at the maximum height position and constitutes the transport path surface, the transported paper sheet W may come into contact with the magnetized surface 42. Absent. Therefore, there is no possibility that the deposits (sand iron, iron powder, etc.) attached to the magnetized surface 42 will come into contact with the deposits and move. Therefore, according to the paper sheet detection sensor 30, there is no possibility that the transported paper sheet W will come into contact with the adhered material adhering to the magnetized surface 42 and move the adhered material. The residual magnetic field of the paper sheet W can be detected satisfactorily without greatly changing the magnetic field of the paper sheet W applied by.

  Further, according to the paper sheet detection sensor 30, the gentle slope 47 is formed at the boundary portion between the magnetized surface 42 and the detection surface 43 of the top plate 41, so that the paper sheet W is caught on the top plate 41. There is no risk of clogging.

  As mentioned above, although Embodiment 2 of this invention was demonstrated, this invention is not limited to this, A various change can be performed.

  9 and 10 each show a modification of the paper sheet detection sensor according to Embodiment 2 of the present invention. FIG. 9 shows a case where the paper sheet is viewed from a direction orthogonal to the paper sheet conveyance direction. FIG. 10 is a cross-sectional view schematically showing, and FIG. 10 is a cross-sectional view schematically showing a case viewed from a direction parallel to the paper sheet conveyance direction. In addition, the same code | symbol is attached | subjected to what has the same structure as the paper sheet detection sensor in Embodiment 1 and 2 mentioned above, and the description is abbreviate | omitted.

  9 and 10, the paper sheet detection sensor 30 ′ is configured integrally with the magnetized body 11 and the magnetic detection unit 12 housed in the holder 40 ′.

  As described above, the holder 40 ′ is a housing that houses the magnetized body 11, the magnetic detection unit 12, and the like. A top plate 41 is provided on the upper surface side of the holder 40 ′, that is, on the surface side facing the conveyance path R. In addition to the magnetized surface 42 and the detection surface 43, a regulation member 44 is formed on the top plate 41. The regulating member 44 is provided on both sides of the magnetized surface 42 and the detection surface 43, protrudes toward the conveyance path R, and has a top portion that is the maximum height together with the detection surface 43 along the conveyance direction of the paper sheet W. It is an extension. That is, the regulating member 44 has a top portion on the same plane as the detection surface 43 and constitutes a conveyance path surface together with the detection surface 43.

  In the paper sheet detection sensor 30 ′ having such a configuration, the regulating member 44 is located at the maximum height position together with the detection surface 43 to form the transport path surface, so that the transported paper sheet W is placed on the magnetized surface 42. There is no risk of contact. Therefore, there is no possibility that the deposits (sand iron, iron powder, etc.) attached to the magnetized surface 42 will come into contact with the deposits and move. Therefore, according to the paper sheet detection sensor 30 ′, there is no possibility that the paper sheet W being conveyed comes into contact with the adhered material adhering to the magnetized surface 42 and moves the adhered material. 11, the magnetic field of the paper sheet W applied by 11 does not fluctuate greatly, and the residual magnetism of the paper sheet W can be detected well.

<Embodiment 3>
FIGS. 11 and 12 each show a paper sheet detection sensor according to Embodiment 3 of the present invention. FIG. 11 schematically shows a case when viewed from a direction perpendicular to the paper sheet conveyance direction. FIG. 12 is a cross-sectional view schematically showing a case when viewed from a direction parallel to the paper sheet conveyance direction. In addition, the same code | symbol is attached | subjected to what has the same structure as the paper sheet detection sensor in Embodiment 1 and 2 mentioned above, and the description is abbreviate | omitted.

  11 and 12, the paper sheet detection sensor 50 is configured integrally with the magnetized body 11 and the magnetic detection unit 12 housed in the holder 60.

  As described above, the holder 60 is a housing that houses the magnetized body 11, the magnetic detection unit 12, and the like. A top plate 61 is provided on the upper surface side of the holder 60, that is, on the surface side facing the conveyance path R. The top plate 61 is made of a nonmetallic material such as phosphor bronze. The top plate 61 has a magnetized surface 62 (magnetized portion) formed at a site corresponding to the magnetized body 11 and a detection surface 63 formed at a site corresponding to the magnetic detector 12. Restricting members 64 are formed on both sides of the magnetized surface 62 and the detection surface 63.

  The magnetized surface 62 and the detection surface 63 are both planar. The regulating member 64 is provided on both sides of the magnetized surface 62 and the detection surface 63, protrudes toward the conveyance path R, and extends along the conveyance direction of the paper sheet W in such a manner that the top portion has the maximum height. It is. That is, as for this control member 64, a top part comprises a conveyance road surface. Here, the protruding height of the regulating member 64 is, for example, about 0.2 to 0.5 mm in order to make it larger than small iron sand or iron powder floating in the air that may adhere.

  In the paper sheet detection sensor 50 having such a configuration, since the top portion of the regulating member 64 has the maximum height and forms the transport path surface, the transported paper sheet W may come into contact with the magnetized surface 62. Absent. Therefore, there is no possibility that the deposits (sand iron, iron powder, etc.) adhering to the magnetized surface 62 will come into contact with the deposits and move. Therefore, according to the paper sheet detection sensor 50, there is no possibility that the transported paper sheet W will come into contact with the adhered material adhering to the magnetized surface 62 and move the adhered material. The residual magnetic field of the paper sheet W can be detected satisfactorily without greatly changing the magnetic field of the paper sheet W applied by.

It is the schematic diagram which showed typically the paper sheet identification device 1 to which the paper sheet detection sensor in Embodiment 1 of this invention is applied. It is the perspective view which showed the structure of the paper sheet detection sensor in FIG. 1, and showed the detection side on the upper surface. It is the top view which showed the structure of the paper sheet detection sensor in FIG. 1, and showed the detection side on the upper surface. It is the sectional view on the AA line in FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is sectional drawing which showed the paper sheet detection sensor in Embodiment 2 of this invention, and showed typically the case where it sees from the direction orthogonal to the conveyance direction of paper sheets. It is sectional drawing which showed the paper sheet detection sensor in Embodiment 2 of this invention, and showed typically the case where it sees from the direction parallel to the conveyance direction of paper sheets. FIG. 9 is a cross-sectional view schematically showing a modification of the paper sheet detection sensor according to the second embodiment of the present invention, as viewed from a direction orthogonal to the paper sheet conveyance direction. FIG. 9 is a cross-sectional view schematically showing a modification of the paper sheet detection sensor according to the second embodiment of the present invention when viewed from a direction parallel to the paper sheet conveyance direction. It is sectional drawing which showed the paper sheet detection sensor in Embodiment 3 of this invention, and showed typically the case where it sees from the direction orthogonal to the conveyance direction of paper sheets. It is sectional drawing which showed the paper sheet detection sensor in Embodiment 3 of this invention typically, and was seen from the direction parallel to the conveyance direction of paper sheets.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper sheet identification device 10, 30, 30 ', 50 Paper sheet detection sensor 11 Magnetized body 12 Magnetic detection part 13 Terminal 20, 40, 40', 60 Holder 21, 41, 61 Top plate 22 (42, 62) Magnetized part (magnetized surface)
23, 43, 63 Detection surface 24 Magnetized surface 25 Protruding portion 25a Top portion 26, 27 Slow slope 44, 64 Restriction member W Paper sheet R Conveyance path

Claims (9)

A magnetizing means disposed in the vicinity of a transport path for transporting a paper sheet having a magnetic material, and applying a magnetic field to the transported paper sheet through a magnetizing unit;
A magnetic detection means disposed on the downstream side of the magnetizing means in the vicinity of the conveyance path, and detecting a magnetic field generated by residual magnetism applied to the magnetic material of the paper sheet through a detection surface when applied by the magnetizing means. In the paper sheet detection sensor,
The magnetized portion is
A planar magnetized surface;
A long protrusion protruding from the magnetized surface toward the transport path and extending along the transport direction of the paper sheet in a form in which the top portion is flush with the detection surface. A paper sheet detection sensor characterized by comprising: The magnetizing means and the magnetic detection means are housed in the same holder,
The paper sheet detection sensor according to claim 1, wherein the magnetized portion and the detection surface are formed on a common plate that constitutes the holder and faces the conveyance path.   3. The plate according to claim 2, wherein gentle slopes are formed on a boundary portion between the magnetized surface and the protrusion and on a boundary portion between the magnetized surface and the detection surface, respectively. The paper sheet detection sensor described. A magnetizing means disposed in the vicinity of a transport path for transporting a paper sheet having a magnetic material, and applying a magnetic field to the transported paper sheet through a magnetizing unit;
A magnetic detection means disposed on the downstream side of the magnetizing means in the vicinity of the conveying path, and detecting, through a detection surface, a magnetic field generated by residual magnetism applied to the magnetic material of the paper sheet by application by the magnetizing means. In the paper sheet detection sensor,
The magnetizing means and the magnetic detection means are housed in the same holder,
The paper sheet detection sensor, wherein the detection surface formed on the same plate as the magnetized portion is formed at a position protruding toward the conveyance path in a mode of a maximum height position.   A regulating member that protrudes toward the transport path on both sides of the magnetized portion and the detection surface of the plate and that extends in the transport direction of the paper sheet in a manner that the top portion is flush with the detection surface. The paper sheet detection sensor according to claim 4, wherein the paper sheet detection sensor is provided. A magnetizing means disposed in the vicinity of a transport path for transporting a paper sheet having a magnetic material, and applying a magnetic field to the transported paper sheet through a magnetizing unit;
A magnetic detection means disposed on the downstream side of the magnetizing means in the vicinity of the conveyance path, and detecting a magnetic field generated by residual magnetism applied to the magnetic material of the paper sheet through a detection surface when applied by the magnetizing means. In the paper sheet detection sensor,
On both sides of the magnetized portion and the detection surface, there are provided regulating members that protrude toward the conveyance path and extend along the conveyance direction of the paper sheets in a mode in which the top portion has the maximum height. Characteristic paper sheet detection sensor. The magnetizing means and the magnetic detection means are housed in the same holder,
The paper sheet detection according to claim 6, wherein the magnetized portion, the detection surface, and the regulating member are formed on a common plate that constitutes the holder and faces the conveyance path. Sensor.   The paper sheet detection sensor according to claim 1, wherein the magnetizing unit is a permanent magnet having a magnetic field strength equal to or greater than a coercive force of the magnetic material of the paper sheet. .   9. The paper sheet detection sensor according to claim 1, wherein the magnetic detection means is a thin film fluxgate magnetic detection element or a magnetic impedance element.

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