Magnetic sensor device

Abstract

Magnetic sensor device, characterized in that the magnetic sensor device comprises the following: a magnet (3, 34); a yoke (4, 4a) arranged on the magnet (3, 34); and an element (5) with a magnetoresistive effect to create a loss magnetic field which is emitted outwards from the yoke (4, 4a), wherein a detection area (2a) of the element (5) with a magnetoresistive effect is arranged on a side of the element (5) with a magnetoresistive effect which is opposite the magnet (3, 34); the element (5) with magnetoresistive effect is provided to detect a change in a premagnetization field (6) of the element (5) with magnetoresistive effect that occurs when a measurement object (1) having a hard magnetic material (1a) passes through the detection area (2a); and a level of the loss magnetic field that satisfies the condition that a change in the premagnetization field (6) of the element (5) with magnetoresistive effect, which occurs due to a combination of the loss magnetic field and a magnetic field which occurs due to spontaneous magnetization of the object (1), is greater than a change in the premagnetization field (6) of the element (5) with magnetoresistive effect, which occurs due to the application of the loss magnetic field to the object (1).

Description

Technical field

[0001] The present invention relates to a magnetic sensor device for detecting a magnetic material (a magnetic component) contained in a paper-sheet-like measuring object. Relevant state of the art

[0002] Conventional magnetic sensor devices exist which consist of a substrate on which an element with a magnetoresistive effect (magnetoresistive element) is formed, and a magnet for applying a premagnetization field to the element with a magnetoresistive effect (see, for example, patent literature 1 and 2).

[0003] Patent literature 1 describes a magnetic sensor device in which the position of a permanent magnet is adjusted such that the strength of a premagnetization field of a magnetically sensitive direction of a magnetoresistive element with a ferromagnetic thin layer has a magnetic flux height that is less than or equal to a saturation magnetic field.

[0004] Patent literature 2 describes the arrangement of two magnetoresistive elements on a substrate, the arrangement of the magnetoresistive elements and the substrate within a housing body, and the arrangement of a permanent magnet on the back of the housing body.

[0005] Furthermore, among conventional magnetic sensor devices there are those in which the element with magnetoresistive effect is formed on a carrier made of magnetic material, and in which a premagnetizing magnet and the carrier made of magnetic material are opposite each other and enclose a conveying path of the object being measured (see, for example, patent literature 3).

[0006] Among conventional magnetic sensor devices, there are those that use a single detector to detect both soft magnetic material contained in the object being measured and hard magnetic material contained in the object being measured (see, for example, patent literature 4).

[0007] Patent literature 5 describes a magnetic sensor with a magnet on one side of a conveyor path, a magnetic pole, and a magnetic body that generates a magnetic field perpendicular to the conveyor path. A magnetoresistive element on the conveyor path side of the magnetic body detects the field in the conveying direction.

[0008] Patent literature 6 describes a magnetic quality detector, particularly in connection with the detection of the magnetic quality of magnetic substances contained in printing ink on paper money and the like.

[0009] Patent literature 7 describes a device that detects the magnetic properties of paper sheets by means of symmetrically arranged upper / lower units with magnetically permeable plates that generate a magnetic field oriented perpendicular to the conveying direction and precisely controlled by plate thickness and spacing. List of state-of-the-art patent literature Patent literature 1: JP 2008- 145 379 A (in particular Fig. 3 to 6) Patent literature 2: JP 2006- 317 218 A (in particular Fig. 9) Patent literature 3: JP 2013- 217 768 A (in particular Fig. 1, Fig. 6 and Fig. 8) Patent literature 4: WO 2013 / 146 755 A (in particular Fig. 2 and Fig. 13) Patent literature 5: US 2015 / 0 102 808 A1 Patent literature 6: JP H06 - 180 305 A Patent literature 7: WO 2010 / 052 797 A1 Description of the invention: Technical problem

[0010] A magnetic sensor device using a magnetoresistive element detects a magnetic material by measuring a change in the resistance of the magnetoresistive element due to a change in the premagnetization field caused by the magnetic material, such as magnetic ink or similar substances. The magnetic material being measured can be either soft or hard magnetic.

[0011] When using the magnetic sensor devices as described in patent literature 1, 2, and 3, soft magnetic material is detected even when the detection of hard magnetic material is attempted. Therefore, a problem with such magnetic sensor devices is that detecting only the hard magnetic material can be difficult.

[0012] Detecting hard magnetic material becomes difficult due to the saturation of the magnetic output signal for both soft and hard magnetic materials, caused by applying an excessively strong premagnetization field to the object being measured, resulting in no difference in the output signal.

[0013] Furthermore, in patent literature 4, although the magnetic sensor device specified therein according to Fig. 2. The use of a magnetoresistive element for the sole detection of hard magnetic material is stated, but no information is given about the relationship between the magnetoresistive element and the premagnetization field for the magnetoresistive element.

[0014] The object of the present invention is to solve the aforementioned problems and to create a magnetic sensor device for highly accurate detection of a measurement object that uses hard magnetic material. Solution to the problem

[0015] The problem underlying the present invention is solved by the subject matter of main claim 1, as well as by the subject matter of dependent claims 7 and 8. Advantageous embodiments are specified in dependent claims 2 to 6 and 9 to 11. Advantageous effects of the invention

[0016] The magnetic sensor device according to the present invention uses a loss magnetic field emitted to the outside of a yoke as a premagnetization field, so that no saturation of the magnetoresistive element takes place, and it is possible for the magnetoresistive element to detect a measurement object having hard magnetic material with high accuracy. Brief description of the drawing

[0017] The drawings show: Fig. 1A and Fig. 1B Configuration diagrams of a magnetic sensor device according to embodiment 1 of the present invention; Fig. 2 a top view of elements with magnetoresistive effect in the magnetic sensor device according to embodiment 1 of the present invention; Fig. 3 a configuration diagram of a magnetic sensor device according to embodiment 2 of the present invention; Fig. 4 a diagram for describing a magnetic field formed by the magnet 3 and the yoke 4 of the magnetic sensor device according to embodiment 2 of the present invention; Fig. 5 a top view of elements with magnetoresistive effect in the magnetic sensor device according to embodiment 2 of the present invention; Fig. 6 a diagram illustrating the operation during detection using the magnetic sensor device according to embodiment 2 of the present invention; Fig. 7A to 7C Diagrams representing the change in the magnetic field, for describing the detection principles of the magnetic sensor device according to embodiment 2 of the present invention; Fig. 8 a configuration diagram of a magnetic sensor device according to embodiment 3 of the present invention; Fig. 9 a top view of elements with magnetoresistive effect in the magnetic sensor device according to embodiment 3 of the present invention; Fig. Diagrams 10A to 10C illustrating the operation during detection using the magnetic sensor device according to embodiment 3 of the present invention; Fig. 11 a configuration diagram of a magnetic sensor device according to embodiment 4 of the present invention; Fig. 12 a graph of an HY component that is adjacent to the magnetoresistive elements of the magnetic sensor device according to embodiment 2 of the invention, in comparison to the magnetic sensor device according to embodiment 5 of the present invention; Fig. 13 a diagram showing a top view of the magnetic sensor device according to embodiment 2, in comparison to the magnetic sensor device according to embodiment 5 of the present invention, wherein the diagram furthermore shows premagnetization field vectors applied to each of the magnetoresistive elements; Fig. 14 a top view of elements with magnetoresistive effect in the magnetic sensor device according to embodiment 5 of the present invention; Fig. 15 a top view of elements with magnetoresistive effect in the magnetic sensor device according to embodiment 6 of the present invention; Fig. 16 a perspective view of a magnetic sensor device according to embodiment 7 of the present invention; Fig. 17 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 7 of the present invention; Fig. 18 a perspective view of a magnetic sensor device according to embodiment 8 of the present invention; Fig. 19 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 8 of the present invention; Fig. 20 a configuration diagram of a magnetic sensor device according to embodiment 9 of the present invention; Fig. 21 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 9 of the present invention; Fig. 22 a configuration diagram of the magnetic sensor device according to embodiment 9 of the present invention; Fig. 23 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 9 of the present invention; Fig. 24 a configuration diagram of the magnetic sensor device according to embodiment 9 of the present invention; Fig. 25 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 9 of the present invention; Fig. 26 a configuration diagram of a magnetic sensor device according to embodiment 10 of the present invention; Fig. 27 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 10 of the present invention; Fig. 28 a configuration diagram of the magnetic sensor device according to embodiment 10 of the present invention; Fig. 29 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 10 of the present invention; Fig. 30 a configuration diagram of the magnetic sensor device according to embodiment 10 of the present invention; Fig. 31 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 10 of the present invention; Fig. 32 a configuration diagram of a magnetic sensor device according to embodiment 11 of the present invention; and Fig. 33 a cross-sectional view in the conveying direction of the magnetic sensor device according to embodiment 11 of the present invention. Description of the embodiments

[0018] In the present invention, the conveying direction 2 of a measured object 1 is defined as the X-direction. The longitudinal direction orthogonal to the conveying direction 2 (X-direction) is defined as the Y-direction. The direction orthogonal to both the conveying direction 2 and the longitudinal direction (direction perpendicular to the conveying direction 2) is defined as the Z-direction. Magnetoresistive elements 5 extend linearly in the longitudinal direction (Y-direction).

[0019] Furthermore, the X-direction is a direction along the X-axis, the Y-direction a direction along the Y-axis, and the Z-direction a direction along the Z-axis. The X-axis, Y-axis, and Z-axis are labeled X, Y, and Z in the figures. Although not shown, the origin of the X-axis, Y-axis, and Z-axis is defined as the central area of ​​the magnetoresistive element 5. In cases where a plus or minus sign (+, -) precedes the X-direction, Y-direction, or Z-direction, the plus or minus sign indicates the direction from the origin. Design 1

[0020] In the following, a magnetic sensor device according to embodiment 1 of the present invention is described with reference to the figures. Fig. Figure 1A is a configuration diagram of the magnetic sensor device according to embodiment 1. The loss magnetic field emanating from the magnet 32 ​​attached to the yoke is almost parallel to the conveying direction 2 (X-direction) at the elements 5 with magnetoresistive effect. Fig. Figure 1B is a configuration diagram of the magnetic sensor device according to embodiment 1. The loss magnetic field emanating from the magnet 34 attached to the yoke is almost parallel to the Z-direction at the elements 5 with magnetoresistive effect.

[0021] In Fig. 1 is the object of measurement 1, paper money, a check, and the like, onto which an image, pattern, or string of characters is printed using ink and the like on a hard magnetic material. The object of measurement 1 has at least one hard magnetic material 1a. That is, the object of measurement 1 can have only the hard magnetic material 1a, or alternatively, it can also have a soft magnetic material. A conveying path 2 is a path for conveying the object of measurement 1, and the direction of the arrows indicates the conveying direction 2 (X-direction) of the object of measurement 1.

[0022] In conveyor path 2, there is a region where the hard magnetic material 1a of the object being measured 1 is detected by means of the magnetoresistive elements 5, a detection area 2a. Detection area 2a is an area on conveyor path 2 on the side of the magnetoresistive elements 5 opposite the magnet 3. When the object being measured 1 is conveyed towards detection area 2a, the components are arranged in the following order in the Z-direction from the magnet 34 attached to the yoke: magnet 34 attached to the yoke, magnetoresistive elements 5, and object being measured 1.

[0023] Detection area 2a is not shown. The magnet 34 attached to the yoke comprises a magnet 3 and a yoke 4. Furthermore, the magnet 3 has a north pole (N-pole) and a south pole (S-pole) as opposing magnetic poles. The yoke 4 is arranged to cover the magnet 3 and is made of a magnetic material, such as iron or the like.

[0024] In Fig. The elements 5 with magnetoresistive effect are arranged between the magnet 3 and the conveyor path 2. The loss magnetic field 6 is a loss magnetic field that is emitted outwards from the yoke 4, or to an outer aspect of the yoke. The loss magnetic field 6, which is emitted by the magnet 34 attached to the yoke, is emitted outwards by the yoke 4. Fig. In 1A, this field is almost parallel to the X-direction. Fig. 1B, this field is almost parallel to the Z-direction. Furthermore, the loss magnetic field 6, as described in more detail below, is used as a premagnetizing field for the elements 5 with a magnetoresistive effect.

[0025] Fig. Figure 2 is a top view of the magnetic sensor device according to embodiment 1. A bridge configuration of the elements 5 with a magnetoresistive effect is frequently used as a countermeasure for temperature compensation. The bridge configuration is used in the description of the present invention. Components 5a (first elements 5a with a magnetoresistive effect) are arranged longitudinally and have a first row of elements 5 with a magnetoresistive effect.

[0026] A plurality of components 5b (second elements 5b with magnetoresistive effect) are arranged longitudinally and have a second row of elements 5 with magnetoresistive effect. The present invention discloses arrangements and an arrangement of the components, namely in series, such as the components 5b and the components 5a in the conveying direction 2.

[0027] The configuration is not limited to such an arrangement. In the magnetic sensor device according to the present invention, the magnetoresistive elements 5 can be referred to as the group 5 with magnetoresistive elements (series 5 with magnetoresistive elements), the components 5a can be referred to as elements 5a with magnetoresistive effect, and the components 5b can be referred to as elements 5b with magnetoresistive effect.

[0028] To enable the magnetoresistive function of elements 5, a magnetic field of suitable strength must be applied. Such a magnetic field is referred to as a premagnetization field 6. Components 5a and 5b are connected to each other by means of a bridge. This means that this connection creates the bridge configuration described above. Fig. 1A The resistance value changes during the magnetic response of the magnetoresistive elements in the X-direction component, which forms the component in the X-direction of the premagnetization field 6. In Fig. 1B the resistance value changes during the magnetic response of the elements 5 with magnetoresistive effect on the magnetic field inclined in the X-direction at the Z-direction component, which is the component in the Z-direction of the premagnetization field 6.

[0029] Since it is desirable to detect the magnetic field (hard magnetic material magnetic field) 7 generated by the hard magnetic material 1a, the premagnetization field 6 is preferably only minimally present at the object 1, which has the hard magnetic material 1a. Thus, the premagnetization field 6 is present at the magnetoresistive elements 5 as the loss magnetic field 6 emitted outwards from the yoke 4. The magnetoresistive elements 5 detect changes in the premagnetization field with the highest sensitivity during a state in which the premagnetization field is present.

[0030] The magnetoresistive elements 5 detect the change in the premagnetization field of the aforementioned magnetoresistive elements that occurs when the object 1, which has the hard magnetic material 1a, passes through the detection area 2a, which is arranged on the side of the magnetoresistive elements 5 opposite the magnet 3. In particular, due to the change in the premagnetization field, the resistance value of the magnetoresistive elements changes, thus enabling the detection of the hard magnetic material 1a based on the change in resistance value.

[0031] The hard magnetic material 1a of the object being measured 1 is magnetized before it reaches the detection area 2a. The magnetized hard magnetic material 1a of the magnetized object being measured 1 passes through the conveyor path 2 while a magnetic field (hard magnetic material magnetic field) 7 forms around the hard magnetic material 1a. This means that the object being measured 1 passes through the detection area 2a in a state in which a magnetic field is generated by spontaneous magnetization.

[0032] Furthermore, the magnet used to magnetize the object 1 (hard magnetic material 1a) can be located inside or outside the magnetic sensor device of the present invention. This means that any configuration is permissible as long as the object 1 is magnetized before it reaches the detection area 2a.

[0033] The change in the premagnetization field 6, which is introduced by passing through the hard magnetic material 1a, enables the detection of the passage through the hard magnetic material 1a. In the vicinity of the elements 5 with magnetoresistive effect, the magnet 34 attached to the yoke applies almost no magnetic field to the object 1, where the object 1 is, for example, paper money and the like.

[0034] Thus, the magnetoresistive elements 5 do not detect a soft magnetic material that does not itself generate a magnetic field, making it possible to distinguish between the hard magnetic material and the soft magnetic material. This capability arises because the positional relations between the yoke 4, the magnetoresistive elements 5, and the detection area 2a satisfy the following condition. The state of the positional relations is described below.

[0035] The condition of these position relations is that the change in the premagnetization field of the elements 5 with magnetoresistive effect, which occurs due to the magnetic field, due to the spontaneous magnetization of the object 1, is greater than the change in the premagnetization field 6 of the elements 5 with magnetoresistive effect, which occurs due to the application of the loss magnetic field 6 from the yoke 4 to the object 6.

[0036] The yoke 4, the magnetoresistive elements 5, and the detection area 2a are arranged in positions that meet these conditions. As a result, a magnetic sensor device can be provided that is capable of detecting small changes in the magnetic field that occur due to the hard magnetic material 1a.

[0037] The arrangement of the yoke 4, the magnetoresistive elements 5, and the detection area 2a in the description of the arrangement of the magnetic sensor device according to embodiment 1 is the same as that for the magnetic sensor devices according to embodiments 2 to 11. The magnetic sensor devices according to embodiments 2 to 11 differ in the positional relationships between the magnet 3 and the yoke 4, and in the number of yokes 4.

[0038] Furthermore, the series of elements 5 with magnetoresistive effect, components 5a, and components 5b are different. Alternatively, a magnetic sensor device 10 for detecting soft magnetic material can be added. The magnetic sensor device according to the present invention can be a combination of any magnetic sensor devices according to embodiments 1 to 11, consistent with the scope of the magnetic sensor device according to the present invention.

[0039] Configurations in the above manner make it possible to create a magnetic sensor device capable of highly sensitive detection of the hard magnetic material, with hardly any sensitivity to the soft magnetic material, so that the magnetic sensor device is able to distinguish between the hard magnetic material and the soft magnetic material. Design 2

[0040] In the following, a magnetic sensor device according to an embodiment of the present invention is described with reference to the figures. Fig. Figure 3 is a configuration diagram of the magnetic sensor device according to embodiment 2. Components in Fig. 3, which are the same as or equivalent to those in the Fig. 1A and Fig. Elements 1B are designated with the same reference numerals, and a description of such elements is omitted. Magnet 3 has opposite magnetic poles in the conveying direction (X-direction), namely an N-pole and an S-pole. This means that the magnetic poles of magnet 3 are arranged along the conveying direction 2, which is the direction of travel of the object being measured 1.

[0041] As seen in a plane (XZ plane) extending in the conveying direction, the yoke 4 is arranged to cover the magnet 3 except for a region of the magnet 3 opposite the conveying path 2, the yoke 4 being made of a magnetic material, such as iron or the like. That is, the yoke 4 is formed at each of the end regions of the magnetic poles, specifically at the front end and the rear end, of the magnet 3 in the conveying direction 2.

[0042] The magnetoresistive elements 5 are arranged between the magnet 3 and the conveyor path 2 of the object being measured 1, specifically between the N and S poles of the magnet 3. This means that in the detection area 2a, the object being measured 2, which has the hard magnetic material 1a, is located on the side of the magnetoresistive elements 5 that are opposite the magnet 3.

[0043] In Fig. The magnetoresistive elements 5 are arranged in the central region between the N and S poles of the magnet 3. In particular, the magnetoresistive elements 5 are arranged on a virtual line orthogonal to the loss magnetic field 6 in a central region in the conveying direction 2 of the yoke 4, which is formed at both the front and rear ends of the magnet 3.

[0044] This virtual line is not shown. The loss magnetic field 6 is emitted by the yoke at the N-pole end of the magnet 3 and is directed towards the S-pole end of the yoke of the magnet 3. This means that the loss magnetic field is generated between the yoke and the N-pole end of the magnet 3 and the S-pole end of the yoke of the magnet 3, and runs almost parallel to the conveying direction (X-direction). Furthermore, as described in more detail below, the loss magnetic field 6 acts as the premagnetizing field 6 of the elements 5 with a magnetoresistive effect, in the same way as in embodiment 1.

[0045] The following discussion concerns the premagnetization field 6 with reference to Fig. 4 described. Fig. Figure 4 is a diagram describing the magnetic field formed by the magnet 3 and the yoke 4 of the magnetic sensor device according to embodiment 2. Fig. 4. The magnetic field generated by the N pole of magnet 3 passes through the interior of yoke 4 and into the S pole of magnet 3. When the area around or the circumference of magnet 3 is thus enclosed by yoke 4, the magnetic field 3 is concentrated within yoke 4.

[0046] However, as in Fig. As shown in Figure 4, due to the absence of the yoke 4 at the position opposite the conveying path 2, the loss magnetic field 6 is emitted into space, albeit slowly. This means that the loss magnetic field 6 exists there, emitted outwards by the yoke 4, and is generated from the N-pole side of the yoke of the magnet 3 to the S-pole side of the yoke of the magnet 3. In embodiment 2, this small loss magnetic field 6 is used as a premagnetization field 6.

[0047] Fig. 5 is a view of the top side of the magnetic sensor device according to embodiment 2 of the invention. Components in Fig. 5, which are the same as or equivalent to those in Fig. Elements 2 and 5 are designated with the same reference numerals, and a description of such elements is omitted. To enable the magnetoresistive effect of elements 5, the application of a magnetic field of suitable strength in the X-direction is required as the premagnetization field 6.

[0048] The premagnetization field 6 is an extremely small magnetic field of approximately 2 mT (millitesla). The magnetic field is preferably barely present on the hard magnetic material 1a of the object 1, so that the yoke 4 effectively shields three surfaces of the magnet 3. The magnetoresistive elements 5 detect the change in the magnetic field with maximum sensitivity when they are in the state in which this premagnetization field 6 is applied.

[0049] The following describes the functionality of the magnetic sensor device. Fig. Figure 6 is a diagram illustrating the operation of the detection process using the magnetic sensor device according to embodiment 2. Components in Fig. 6, which are the same as or equivalent to those in Fig. 1A and Fig. Items 1B are provided with the same reference numbers, and a description of such elements is omitted. Fig. 6 A change is added to the distribution of the premagnetization field 6, specifically at the position where the elements 5 with magnetoresistive effect are arranged, when the hard magnetic material magnetic field 7 approaches the elements 5 with magnetoresistive effect, and subsequently when the hard magnetic material magnetic field 7 moves away.

[0050] The magnet 3 and the yoke 4 transmit a premagnetization field 6 to the magnetoresistive elements 5 in the manner described above, which is suitable for the operation, thus enabling highly sensitive detection of the change in the premagnetization field 6 due to the hard magnetic material 1a.

[0051] The following is made with reference to Fig. 6 and Fig. 7 a more detailed description. Fig. Figure 7 is a diagram showing the changes in the magnetic field to describe the detection principle of the magnetic sensor device according to embodiment 2. As in Fig. As shown in Figure 6, the main component of the magnetic field 6 is located near the magnetoresistive elements 5, which are arranged parallel to the conveyor path. The X-direction component of this magnetic field 6 is used as the premagnetization field 6 of the magnetoresistive elements 5. It is defined here as the X-direction component 6x of the premagnetization field 6.

[0052] Fig. 7A represents the height and direction of the X-direction component Hx of the premagnetization field 6 when no hard magnetic material 1a is present. When the hard magnetic material 1a is adjacent to the detection area 2a, as shown in Fig. As shown in Figure 7B, the X-direction component Hx of the premagnetization field 6 is aligned in the opposite direction to the X-direction component of the magnetic field 7 of the hard magnetic material 1a. Thus, the premagnetization field 6 (Hx) applied to the magnetoresistive elements 5 becomes small.

[0053] If the hard magnetic material 1a is separated from the detection area 2a, as for example in Fig. As shown in Figure 7C, the X-direction component Hx of the premagnetization field 6 is directed in the same direction as the X-direction component of the magnetic field 7 of the hard magnetic material 1a. Thus, the premagnetization field 6 (Hx) applied to the magnetoresistive elements 5 becomes large. Consequently, the resistance of the magnetoresistive elements 5, which are magnetically sensitive in the X-direction component, changes, enabling them to detect the hard magnetic material 1a.

[0054] This means that the height of the premagnetization field 6 (Hx) changes in the conveying direction (X-direction) due to the passage through the hard magnetic material 1a (object 1), so that the resistance value of the magnetoresistive elements 5, which exhibit magnetic sensitivity to changes in the X-direction component, enables the detection of the hard magnetic material 1a. Fig. 7B and Fig. 7C, where the dashed arrow parallel to the premagnetization field 6 indicates the height of the premagnetization field 6 in Fig. 7A on.

[0055] This means that this change in the premagnetization field 6 occurs due to the passage through the hard magnetic material 1a, so this configuration enables the detection of the passage through the hard magnetic material 1a. Thus, a magnetic sensor device can be provided with which it is possible to read small changes in the magnetic field due to the hard magnetic material 1a.

[0056] Furthermore, due to the configuration of the magnetic sensor device in this way, hardly any magnetic field is applied to the object 1 (hard magnetic material 1a) by means of the magnet 3 and the yoke 4 near the elements 5 with magnetoresistive effect 5. The object 1 can be, for example, paper money or the like. Even if the object 1 has soft magnetic material that does not itself generate a magnetic field, the soft magnetic material is not detected, so that a distinction between the hard magnetic material and soft magnetic material is possible.

[0057] Configurations in the aforementioned manner make it possible to manufacture a magnetic sensor device capable of performing highly sensitive detection of the hard magnetic material 1a, with hardly any sensitivity to soft magnetic material, so that the magnetic sensor device is able to distinguish between the hard magnetic material and the soft magnetic material. embodiment 3

[0058] In the following, a magnetic sensor device according to embodiment 3 of the present invention is described with reference to the figures. Fig. 8 is a configuration diagram of the magnetic sensor device according to embodiment 3. Components in Fig. 8, which are the same as or equivalent to those from Fig. The three elements are provided with the same reference numbers, and a description of such elements is omitted.

[0059] In Fig. Magnet 3 has N and S magnetic poles arranged in opposite directions (Z-direction) perpendicular to the conveying direction 2. This means that for magnet 3, the magnetic poles are arranged along the direction (Z-direction) orthogonal to the conveying direction 2, which is the direction of travel of the measured object 1.

[0060] The yoke 4a is arranged on a side surface along the conveying direction 2 of the N-pole end of the magnet 3. This means that the yoke 4a is formed on the side surface of the magnet 3 opposite the magnetoresistive elements 5. A yoke 4h is a second yoke. Thus, the yoke 4a can be considered a first yoke. The yoke 4h is arranged to cover a side surface of the magnet along the conveying direction 2 of the S-pole end of the magnet 3. Furthermore, the length of the yoke 4h in the conveying direction 2, or in the through-direction (X-direction), is shorter than the length of the yoke 4a in the X-direction.

[0061] This means that the yoke 4h is formed on the side of magnet 3 opposite the side of magnet 3 that faces the magnetoresistive elements 5. This also means that the length of yoke 4h in the X-direction is shorter than the length of yoke 4a in the X-direction. The length of yoke 4h in the X-direction is longer than the length of magnet 3 in the X-direction. The length of yoke 4a in the X-direction is the same length as the length of magnet 3 in the X-direction. The magnetoresistive elements 5 are in Fig. 8 in central areas of the yoke 4a and the magnet 3, specifically viewed centrally in the width of the conveying direction 2 (X-direction), and arranged on the N-pole side of the magnet 3, and are arranged between the yoke 4a and the conveying path 2 of the measuring object 1.

[0062] This means that the magnetoresistive elements 5 are arranged along a virtual line extending in the Z-direction, which is the orientation of magnets 3 and yoke 4a. This virtual line is not shown below. Furthermore, the central region of magnet 3, the central region of yoke 4a, and the central region of the magnetoresistive elements 5 coincide in the X-direction. Thus, the central regions of magnet 3, yoke 4a, and the magnetoresistive elements 5 intersect the Z-axis passing through the origin.

[0063] The premagnetization field 6 is described below. The length of the yoke 4a in the X-direction, which is formed at the N-pole end of the magnet 3, is longer than the length of the magnet 3 in the X-direction. Thus, the magnetic field generated by the N pole of the magnet 3 propagates through the yoke 4a in both the positive and negative conveying directions 2. Due to this propagation, the magnetic field distribution of the propagation path to the S pole of the magnet 3 and the yoke 4h is dominant, specifically from both end regions of the yoke 4a in the conveying direction 2 and from both end regions of the yoke 4a facing the S-pole surface of the magnet 3 in the conveying direction 2.

[0064] In this way, the magnetic field from both ends, viewed in the conveying direction 2, of yoke 4a in the direction of the S-pole of magnet 3 and of yoke 4h, which is formed on the S-pole side, becomes dominant. Thus, the magnetic field emitted by the magnetic pole (N-pole) beyond which yoke 4a extends, and emitted in the perpendicular direction (Z-direction) from the sides of yoke 4a facing the conveying path 2, is not dominant. Therefore, the magnetic field emitted in the Z-direction becomes small. This small magnetic field perpendicular to the conveying direction 2 is used as the premagnetization field 6.

[0065] The small magnetic field can be maintained even if the lengths of yoke 4a and yoke 4h are the same in the X-direction. However, setting yoke 4a longer than yoke 4h, as shown in Fig. Figure 8 shows a further reduction of the magnetic field emitted in the Z-direction. This means that the premagnetization field 6 can be reduced if the length of yoke 4a relative to yoke 4h is increased in the X-direction.

[0066] Fig. Figure 9 is a top view of the magnetic sensor device according to embodiment 3. Components 5a and 5b are arranged in a central region of the magnet 3, viewed in the conveying direction 2, and are arranged symmetrically relative to the Y-axis, which passes through the origin. The X-direction inclined magnetic field of the Z-direction component, which is the component of the premagnetization field 6 in the Z-direction, is shown as the premagnetization field 6 acting in the +X direction for components 5a and in the -X direction for components 5b.

[0067] Details of the functionality are provided with reference to Fig. 8, Fig. 9 and Fig. 10 described. Fig. Figure 10 is a diagram describing detection using the magnetic sensor device according to embodiment 3. Fig. 10 are the first elements 5a with magnetoresistive effect and the second elements 5b with magnetoresistive effect 5b, although the Z-direction component perpendicular to the conveyor path 2 becomes the main component of the magnetic field 6, in the vicinity where the elements 5 with magnetoresistive effect 5 are arranged, slightly offset in the X-direction, offset from the central axis (Z-axis passing through the origin).

[0068] Thus, this is in Fig. 10A the magnetic field 6 shown is slightly inclined in the conveying direction (X-direction) from the vertical direction (Z-direction), and the X-direction component of the magnetic field 6 acts as the premagnetization field 6 of the elements 5 with magnetoresistive effect, and is referred to as the X-direction component 6x of the premagnetization field.

[0069] The following describes the function of component 5a. Due to the arrangement of component 5a, offset from the central axis towards the transport side (downstream side of the conveyor path 2 relative to the detection area 2a) of the hard magnetic material 1a, the premagnetization field 6 is applied in the X-direction. When the hard magnetic material 1a approaches the detection area 2a, as shown in Fig. As shown in Figure 10B, the direction of the X-direction component Hx of the premagnetization field 6 is opposite to the direction of the X-direction component of the hard magnetic material magnetic field 7 of the hard magnetic material 1a.

[0070] Thus, the premagnetization field 6 is inclined towards the hard magnetic material 1a, and the component Hx of the premagnetization field 6 in the conveying direction (X-direction) becomes smaller. When the hard magnetic material 1a is separated from the detection area 2a, as in Fig. As shown in Figure 10C, the direction of the X-direction component Hx of the premagnetization field 6 is the same direction as the direction of the X-direction component of the hard magnetic material magnetic field 7 of the hard magnetic material 1a.

[0071] Thus, the premagnetization field 6 is inclined towards the hard magnetic material 1a, as if it were attracted by the hard magnetic material 1a. Consequently, the component Hx of the premagnetization field 6 in the conveying direction (X-direction) becomes larger. As the component Hx increases, the resistance of the magnetoresistive elements 5, which detect the X-direction component of the premagnetization field 6, changes, and the hard magnetic material 1a can be detected.

[0072] This means that the height of the premagnetization field 6 in the conveying direction (X-direction) (Hx) changes during the passage through the hard magnetic material 1a (object 1), so that the resistance value of the magnetoresistive elements 5, which are magnetically sensitive to changes in the X-direction component, changes, and the hard magnetic material 1a can be detected. The dashed arrows, which indicate the premagnetization field 6 in the Fig. 10B and Fig. 10C crossings give the position of the premagnetization field 6 in Fig. 10A on.

[0073] Due to the arrangement of component 5b, offset from the central axis towards the feed side (upstream side of the conveying path 2 relative to the detection area 2a) of the hard magnetic material 1a, the premagnetization field 6 is applied in the -X direction. This arrangement differs in that the direction of component Hx of the premagnetization field 6 in the conveying direction (X direction) increases as the hard magnetic material 1a approaches; and in that component Hx of the premagnetization field 6 in the conveying direction (X direction) decreases as the hard magnetic material 1a is separated. However, the detection function of the hard magnetic material 1a is the same as that of component 5a.

[0074] This means that passing through the hard magnetic material 1a causes a change in the premagnetization field 6, so that this configuration type enables the detection of the passage through the hard magnetic material 1a. As a result, a magnetic sensor device can be provided that is capable of reading out small changes in the magnetic field that occur due to the hard magnetic material 1a.

[0075] A configuration of the magnetic sensor device in this way further enables a reduction of the magnetic field applied to the object of measurement 1 (hard magnetic material 1a), wherein the object of measurement 1 is, for example, paper money and the like, and wherein the magnetic field is applied by the magnet 3, the yoke 4a and the yoke 4h in the vicinity of the elements 5 with magnetoresistive effect.

[0076] Even if a soft magnetic material, which itself does not generate a magnetic field, is contained within the object under test 1, the detection level for the soft magnetic material is reduced, thus enabling the differentiation between the hard magnetic material and the soft magnetic material. Furthermore, the obtained output signal is theoretically doubled for the present configuration due to the application of the biasing field in opposite directions for components 5a and 5b. Design 4

[0077] In the following, a magnetic sensor device according to embodiment 4 of the present invention is described with reference to Fig. 11 described. Fig. Figure 11 is a configuration diagram of the magnetic sensor device according to embodiment 4. Components in Fig. 11, which are the same as or equivalent to those in Fig. 3 and Fig. The 8 elements are provided with the same reference numerals, and a description of such elements is omitted. The magnetic sensor device 10 for detecting soft magnetic material according to Fig. 11 is designed to detect soft magnetic material and includes, for example, a second magnetic sensor 20 and a second magnetic device 32 for a premagnetization field, as shown in Fig. 13 is shown in patent literature 4.

[0078] This means that even if the object being measured 1 has soft magnetic material in addition to the hard magnetic material 1a, the magnetic sensor device according to embodiment 4 detects the soft magnetic material by means of the magnetic sensor device 10 for detecting soft magnetic material.

[0079] A magnetic field 11, which is in Fig. Figure 11 shows the premagnetization field generated by the premagnetizing magnet of the magnetic sensor device 10 for detecting soft magnetic material. The purpose of the magnetic sensor device for detecting soft magnetic material is to detect soft magnetic material. The magnetic sensor device 10 for detecting soft magnetic material thus uses the premagnetizing magnet to generate a strong magnetic field 11 in a detection area of ​​the magnetic sensor device 10 for detecting soft magnetic material in the conveyor path 2.

[0080] The magnetic sensor device 10 for detecting soft magnetic material uses an element with a magnetoresistive effect to detect disturbances of the magnetic field caused by the soft magnetic material when the soft magnetic material passes through the detection area of ​​the magnetic sensor device 10 for detecting soft magnetic material.

[0081] In the magnetic sensor according to embodiment 4, the magnetic sensor device 10 for detecting soft magnetic material and the magnetic sensor device 101 for detecting hard magnetic material according to embodiment 2 are both arranged along the conveying path 2. Fig. 11 represents the magnetic sensor device in which the detection area of ​​the magnetic sensor device 10 for detecting soft magnetic material is arranged in a front area in the conveying path 2, and in which the detection area 2a is arranged in a rear area.

[0082] The in Fig. The magnetic sensor device shown in Figure 11 is configured such that the hard magnetic material 1a approaches a magnetic sensor device 101 for detecting hard magnetic material after passing through the strong magnetic field of the premagnetizing magnet of the magnetic sensor device 10 for detecting soft magnetic material. By configuring the magnetic sensor device in this way, the soft magnetic material of the object 1 is magnetized as it passes near the detection area of ​​the magnetic sensor device 10, and the soft magnetic material and the hard magnetic material 1a generate the magnetic field.

[0083] The magnetic sensor device 10 for detecting soft magnetic material can detect the change in the magnetic field caused by the soft magnetic material and the hard magnetic material 1a, which occurs when the object being measured arrives at the detection area of ​​the magnetic sensor device 10. Furthermore, the pre-magnetizing magnet of the magnetic sensor device 10 acts as a magnetizing magnet for the hard magnetic material 1a, which is required for the detection of the hard magnetic material 1a by the magnetic sensor device 101, which is located at the rear.

[0084] In the Fig. In the magnetic sensor device shown in Figure 11, the hard magnetic material 1a of the object being measured 1 is magnetized when passing near the detection area of ​​the magnetic sensor device 10 for detecting soft magnetic material, and the object being measured approaches the detection area 2a of the magnetic sensor device 101 for detecting hard magnetic material in a state in which the hard magnetic material 1a itself generates a magnetic field.

[0085] The magnetic sensor device 101 for detecting hard magnetic material can detect the change in the magnetic field due to the hard magnetic material 1a, which is detected by means of the elements 5 with magnetoresistive effect, due to the arrival of the object 1 at the detection area 2a.

[0086] Due to this configuration of the magnetic sensor device, the soft magnetic material is detected only by means of the magnetic sensor device 10 for detecting soft magnetic material, and the hard magnetic material can be detected by both the magnetic sensor device 10 for detecting soft magnetic material and the magnetic sensor device 101 for detecting hard magnetic material. This configuration enables differentiation between the soft magnetic material and the hard magnetic material in the object being measured 1. Design 5

[0087] The magnetic sensor device according to embodiment 5 of the invention is described with reference to the Fig. 12, Fig. 13 and Fig. 14 described. Fig. Figure 12 is a graph indicating the Hy component present at the elements with magnetoresistive effect according to Fig. 5. The height of the Hy component is along the vertical axis of the graph, which is in Fig. Figure 12 shows a recorded position along the horizontal axis. Fig. The dashed line shown in Figure 12 passes through the origin. Furthermore, the premagnetization field Hx is applied to the elements 5 with a magnetoresistive effect. Due to the finite length of magnet 3, the Fig. The Hy component shown in 12 also exhibits a magnetoresistive effect at elements 5.

[0088] Fig. Figure 13 is a top view of the object being measured 1, which is being transported through the conveyor path 2, in addition to the top view of the configuration according to Fig. 5. This means that Fig. 13 as a top view of the configuration according to Fig. 3 can be designated. Fig. Figure 13 represents the premagnetization field vectors applied to components 5a and 5b, which are the magnetoresistive elements 5. Premagnetization field vectors 6v indicate the vectors applied to components 5a and 5b by means of the yoke 4.

[0089] As in Fig. As shown in Figure 13, the Hy component has the effect of transmitting the premagnetization field vectors 6a to the magnetoresistive elements 5 in the -Y direction from the center of the magnetoresistive elements 5 that are inclined in the -Y direction. Likewise, the Hy component has the effect of transmitting the premagnetization field vectors 6b to the magnetoresistive elements 5 in the +Y direction from the center of the magnetoresistive elements 5 that are inclined in the +Y direction.

[0090] As in Fig. As shown in Figure 13, a magnetic field change 611a occurs due to the hard magnetic material 1a in a direction (X-direction) perpendicular to the hard magnetic material 1a when the hard magnetic material 1a, which extends parallel to the Y-direction, is conveyed. Due to the magnetic field change 611a, magnetic field changes in the X-direction occur for both the premagnetization field vector 6a, which is inclined in the -Y-direction, and the premagnetization field vector 6b, which is inclined in the +Y-direction.

[0091] A vector rotation occurs due to the generation of this X-direction magnetic field change, and the inclination of the premagnetization field vector 6a changes, becoming the detection magnetic field vector 61a, which is indicated by the dashed arrow in Fig. Figure 13 shows that this change in the inclination of the vectors reverses when the hard magnetic material 1a passes the magnetoresistive elements 5. This occurs because the magnetic field change 611 in the X-direction reverses at the boundary of the hard magnetic material 1a.

[0092] Although the premagnetization field vector 6a and the detection magnetic field vector 61a are both inclined in the -Y direction, the inclination of the premagnetization field vector 6a in the -Y direction is greater. In the same way as in the relationship between the premagnetization field vector 6a and the detection magnetic field vector 61a, the inclination of the premagnetization field vector 6b changes when a vector rotation occurs, and the premagnetization field vectors 6b change and become the detection magnetic field vectors 61b, which are represented by the dashed arrows in Fig. 13 are listed.

[0093] Although the premagnetization field vector 6b and the detection magnetic field vector 61b are both vectors inclined in the direction of the +Y direction, the inclination of the premagnetization field vector 6b in the direction of the +Y direction is greater.

[0094] In this way, if the premagnetization field in the Y-direction differs between components 5a and components 5b of the elements 5 with magnetoresistive effect, a component-to-component variance is generated in the output signal of the measured object 1 for each component 5a and component 5b. The magnetic sensor device according to embodiment 5 is advantageous when a reduction of such variance is required.

[0095] Fig. Figure 14 is a top view of the magnetic sensor device according to embodiment 5. Components in Fig. 14, which are the same as or equivalent to those in Fig. The 5 items are provided with the same reference numbers and a description of such elements is omitted. Fig. Figure 14 represents a modified example of embodiment 2 of the invention ( Fig. 5). In Fig. In section 14, the X-component of the premagnetization field vector 6v is defined such that it is adjacent to components 5a and 5b in the +X direction. In an XY plane extending in the X and Y directions, the components are defined in Fig. 14 illustrated elements 5 with magnetoresistive effect (components 5a and components 5b) are mounted in two rows, with the same inclination from the longitudinal direction (Y-direction) in the direction of the conveying direction (X-direction).

[0096] This means that for the elements 5 with magnetoresistive effect, which are in Fig. As shown in Figure 14, the components 5a are arranged along the longitudinal direction (Y-direction), which intersects the conveying direction (X-direction), which is the direction of travel through the detection area. The components 5a are inclined relative to the X and Y directions and can be considered to be formed within the XY plane.

[0097] Furthermore, components 5b are arranged as magnetoresistive elements 5 along the Y-direction, and components 5b are inclined relative to the X- and Y-directions and can be assumed to be formed within the XY-plane. The inclination angles of components 5a and components 5b, as shown in Fig. Figure 14 shows the same elements. Furthermore, the elements of components 5a and 5b, which lie next to each other in the Y-direction, have the same inclination.

[0098] The in Fig. The configuration shown in Figure 14 allows the application of a magnetic flux in a defined direction to the magnetoresistive elements by means of the premagnetization field in the X-direction, where the defined direction is the longitudinal direction in the +Y-direction (non-magnet-sensitive direction), for both components 5a and 5b. Thus, the Y-direction magnetic field formed by magnet 3 and yoke 4 can be canceled, and Hy can be applied in the same direction.

[0099] Thus, the vector direction of the premagnetization field is easy to arrange for all of the linearly arranged components 5a and components 5b, which has the effect of providing a stable output signal from the magnetic sensor device. Design 6

[0100] The magnetic sensor device according to embodiment 6 of the present invention is described below with reference to Fig. 15 described. Components in Fig. 15, which are the same as or equivalent to those in Fig. The 9 items are provided with the same reference numbers and a description of such elements is omitted. Fig. 15 represents a modified example of embodiment 3 ( Fig. 9).

[0101] In the elements 5 with magnetoresistive effect of the in Fig. In the magnetic sensor devices shown in 9, the adjacent Hy component is the same as in Fig. 12. Thus, in the same way as in Fig. 13 and, as explained in embodiment 5, a rotation of the premagnetization field vector 6v. Furthermore, the element-to-element variance for each of the components 5a and 5b is generated in the output signal of the measured object 1 when the premagnetization field in the Y-direction differs between the components 5a and between the components 5b of the elements 5 with magnetoresistive effect. The magnetic sensor device according to embodiment 6 is advantageous in the same way as the magnetic sensor device according to embodiment 5 when a reduction of such variance is required.

[0102] Fig. Figure 15 is a top view of the magnetic sensor device according to embodiment 6. Fig. In section 15, the X-component of the premagnetization field vector 6v is defined such that it is applied in the +X direction for components 5a and in the -X direction for components 5b. On an XY plane extending in the X and Y directions, the elements 5 with magnetoresistive effect (components 5a and components 5b) are as shown in Fig. Figure 15 shows the components mounted in two rows, inclined from the longitudinal direction (X-direction) towards the conveying direction (X-direction). Components 5a and 5b are symmetrical relative to the Y-axis (dashed axis, which is shown in Figure 15). Fig. 15 is shown), which passes through the origin.

[0103] As elements 5 with magnetoresistive effect, which in Fig. As shown in Figure 15, the components 5a are arranged along the longitudinal direction (Y-direction), which intersects the conveying direction (X-direction), which is the direction of travel through the detection area. The components 5a are inclined relative to the X and Y directions and can be considered to be formed within the XY plane. Furthermore, elements 5 with a magnetoresistive effect are shown, which are in Fig. As shown in Figure 15, the components 5b are arranged along the Y direction, the components 5b are inclined relative to the X and Y directions and can be considered to be formed within the XY plane.

[0104] In the Fig. In Figure 15, components 5a and 5b are shown. Specifically, components 5a, which are arranged in one row, and components 5b, which are arranged in another row, have different inclination directions for adjacent components in the X-direction. Although the inclination directions are different, the configuration of the elements is symmetrical relative to the Y-axis (dashed axis, which is shown in Figure 15). Fig. 15 is shown).

[0105] Furthermore, in components 5a and 5b, the adjacent elements have the same inclination in the Y-direction. The Y-axis, which is the axis of symmetry of components 5a and 5b, can be considered to run through the central area of ​​magnet 3 (yoke 4) in the conveying direction (X-direction).

[0106] In the Fig. In the configuration shown in Figure 15, the premagnetization field in the +X direction at components 5a and the premagnetization field in the -X direction at components 5b allow the application of a magnetic field in a defined direction, which is the longitudinal direction in the +Y direction (non-magnetically sensitive direction) of the elements with a magnetoresistive effect, for both components 5a and components 5b. Thus, the Y-direction magnetic field formed by the magnet 3 and the yoke 4 can be canceled, and Hy can be applied in the same direction. This enables the magnetic sensor according to embodiment 6 to achieve the same effects as the magnetic sensor according to embodiment 5. Model 7

[0107] In the following, a magnetic sensor device according to embodiment 7 of the present invention is described with reference to the Fig. 16 and Fig. 17 described. Fig. Figure 16 is an inclined perspective view of the magnetic sensor device according to embodiment 7. Fig. Figure 17 is a cross-sectional view of the magnetic sensor device according to embodiment 7, in the conveying direction. Components in the Fig. 16 and Fig. 7, which are the same as or equivalent to those in Fig. 5, Fig. 6 and Fig. The 7 items are provided with the same reference numbers and a description of such elements is omitted.

[0108] In the Fig. 16 and Fig. In Figure 17, the magnetoresistive elements 5 of the magnetic sensor device are covered by a metal made of non-magnetic material. This non-magnetic metal protects the magnetic sensor devices from contact with the object being measured 1, from contamination by foreign bodies, and the like. Furthermore, the non-magnetic metal allows the magnetic field to pass through and provides electrical shielding for the magnetic sensor device.

[0109] In particular, the magnetic sensor device comprises an outer shell that covers a shielding cover 20, a housing 21 made of resin or metal, and a metallic mounting bracket 22. The shielding cover 20 extends in the longitudinal direction (Y-direction). The housing 21 secures the shielding cover 20 and contains and protects the magnets 3, the yoke 4, and the magnetoresistive elements 5. The mounting bracket 22 is electrically connected to the shielding cover 20, grounds the magnetic sensor device, and is located at an end region of the housing 21 in the longitudinal direction (Y-direction).

[0110] The magnet 3 (magnet 34 attached to the yoke) and the magnetoresistive elements 5 are arranged at a predetermined distance to apply a suitable premagnetization field to the magnetoresistive elements 5 of the magnetic sensor device. This predetermined distance allows a non-magnetic support 23 to be positioned between the magnet 3 (magnet 34 attached to the yoke) and the magnetoresistive elements 5. The magnetoresistive elements 5 are fixed to the non-magnetic support 23.

[0111] An integrated circuit (IC), not shown, is used to amplify and process the signals of the resistance change values ​​of the magnetoresistive elements 5, which are fixed to the non-magnetic carrier 23. The non-magnetic carrier 23 is fixed to the side of the magnet 3 that faces the conveyor path 2. In the magnetic sensor device of the present invention, the non-magnetic carrier 23 is mounted on the magnet 34 attached to the yoke, and the magnetoresistive elements 5 can be considered to be formed on this non-magnetic carrier 23. The IC is also formed on the non-magnetic carrier 23.

[0112] The magnetic sensor device, which is in Fig. Figure 17 is shown as a cross-section in the conveying direction, which is an XZ-plane cross-section extending in the X and Z directions. As can be seen in the cross-section, the yoke 4 covers the magnet 3, except for the part of the magnet 3 that faces the conveying path. Furthermore, the area of ​​the yoke 4 opposite the side of the magnet 3 facing the conveying path 2 is designed for heat dissipation and has a metallic component 24 for heat dissipation, which is designed for heat dissipation from a component 24 for heat dissipation through the spacer for heat transfer 25.

[0113] Due to the contact between the non-magnetic support 23 and the magnet 3 and the yoke 4, heat can be dissipated from component 24 to the heat dissipation point via the magnet 3 and the yoke 4, even if the non-magnetic support 23 generates heat. This means that even if the magnetoresistive elements 5 and the IC fixed to the non-magnetic support 23 generate heat, simple heat dissipation is possible via thermal contact between component 24, the magnetoresistive elements 5, and the IC.

[0114] To increase the heat dissipation surface area, the heat dissipation component 24 has an angled, U-shaped curved structure, viewed in cross-section in the XZ plane, extending in the conveying direction (X-direction) and the Z-direction. The heat dissipation component 24, shaped in this way, extends together with the heat transfer spacer 25 in the longitudinal direction (Y-direction).

[0115] Furthermore, component 24 for heat dissipation and spacer 25 for heat transfer can collectively be referred to as a heat dissipation component (heat dissipation element). Naturally, component 24 for heat dissipation and spacer 25 for heat transfer can also constitute an integrated part (element).

[0116] The basic configuration and operation of the magnetic sensor device are the same as those of the magnetic sensor device according to embodiment 2.

[0117] In particular, the configuration of the magnets 34 attached to the yoke is the same for embodiments 7 and 2. In embodiment 7, the magnetoresistive elements 5 and the IC, which are heat-generating components, are fixed to the metal carrier 23.

[0118] Therefore, as described above, a thermal connection with component 24 for heat dissipation is provided by the magnet 34 attached to the yoke (magnet 3 and yoke 4) and the spacer 25 for heat transfer. This allows heat generated by the magnetoresistive elements 5 and the IC to be effectively dissipated into the air surrounding the metal support 23, the magnet 34 attached to the yoke (magnet 3 and yoke 4), the spacer 25 for heat transfer, the heat dissipation component 24, and the like. This prevents a temperature increase of the magnetoresistive elements 5 and the IC, resulting in a magnetic sensor device that is easy to operate and exhibits improved reliability.

[0119] The shielding cover 20 is grounded to a higher-level system-side device by the mounting 22, thus preventing damage and malfunction of the magnetoresistive elements 5 and the IC due to static electricity. This creates a magnetic sensor device with improved performance and reliability. The term "higher-level system" refers to a device for distinguishing paper money and the like, in which the magnetic sensor device is installed.

[0120] Furthermore, the mechanical connection between the holder 22 and the component 24 for heat dissipation ensures that the heat generated by the magnetic sensor device is transferred to the system-side device and thus further suppresses a temperature increase of the magnetic sensor device. Design 8

[0121] In the following, a magnetic sensor device according to embodiment 8 of the invention is described with reference to Fig. 18 and Fig. 19 described. Fig. Figure 18 is an inclined perspective view of the magnetic sensor device according to embodiment 8. Fig. Figure 19 is a cross-sectional view of the magnetic sensor device according to embodiment 8, as seen in a conveying direction.

[0122] Components in Fig. 18 and Fig. 19, which are the same as or equivalent to those in the Fig. 8, Fig. 9, Fig. 10, Fig. 16 and Fig. Items 17 and 17 are provided with the same reference numerals, and a description of such elements is omitted. The basic configuration and operation of the magnetic sensor device are the same as those of the magnetic sensor device according to embodiment 3. In particular, the configuration of the magnet 34 attached to the yoke is the same for embodiments 8 and 3.

[0123] The magnetic sensor device according to embodiment 8 and the magnetic sensor device according to embodiment 7 differ only in the configuration of the magnet 34 attached to the yoke. Therefore, Fig. 18, which represents the outer cover of the magnetic sensor device, represents an outer cover which is the same as that of Fig. 16. The yoke 4 is formed on the magnet 3 of the magnetic sensor device according to embodiment 7. Conversely, the yoke 4a and the yoke 4h are formed on the magnet 3 of the magnetic sensor device according to embodiment 8.

[0124] In Fig. 19 is a yoke pair, yoke 4a and yoke 4h, arranged at the magnetic pole ends of magnet 3, specifically at the pole ends in the direction perpendicular to the conveying direction (Z-direction). This means that the positional relation between the "yoke" and the metal carrier 23 is determined from the Fig. 17 different. Furthermore, although the metal support 23 holds the magnet 3 in Fig. 17 contacts, the metal support 23 and the magnet 3 contact each other in Fig. 18 not.

[0125] However, heat is transferred from the yoke 4a to the magnet 3 and from the magnet 3 to the yoke 4h due to the contact between the metal support 23 and the yoke 4a in the magnetic sensor device according to embodiment 8. Due to the contact between the yoke 4h and the spacer 25 for heat transfer, the operation and effect according to embodiment 8 are the same as those according to embodiment 7. Design 9

[0126] In the following, a magnetic sensor device according to embodiment 9 of the invention is described with reference to the figures. Fig. Figure 20 is a configuration diagram of the magnetic sensor device according to embodiment 9.

[0127] Fig. Figure 21 is a cross-sectional view of the magnetic sensor device according to embodiment 9, viewed in one conveying direction. Components in Fig. 20 and Fig. 21, which are the same as or equivalent to those in the Fig. 8, Fig. 9, Fig. 10, Fig. 18 and Fig. The 19 items are provided with the same reference numbers, and a description of such elements is omitted.

[0128] In the Fig. 20 and Fig. 21 The magnet has 3 magnetic poles that are different from each other, N-pole and S-pole, in the direction perpendicular (Z-direction) to the conveying direction 2. This means that the magnet has 3 magnetic poles that are arranged along the direction (Z-direction) orthogonal to the conveying direction 2, which is the direction of travel of the measured object 1.

[0129] The yoke 4a is arranged on the side surface of the magnet 3, extending along the conveying direction 2 of the north-pole end. That is, the yoke 4a is formed on the side of the magnet 3 opposite the magnetoresistive elements 5. The yoke 4b is the second yoke. Accordingly, the yoke 4a can be referred to as the first yoke. In the present invention, the length of the yoke 4a in the X-direction, which is in the Fig. As shown in Figures 20 to 31, the yoke 4b is shorter than the length of magnet 3 in the X direction. The yoke 4b is arranged to cover magnet 3, except for an area opposite yoke 4a.

[0130] In particular, the yoke 4b is formed at both ends, the front end and the rear end of the magnet 3, viewed in the X direction. Furthermore, the yoke 4b is continuous from the side of the magnet 3 facing the magnetoresistive elements 5 to the side of the magnet opposite them. That is, the yoke 4b is composed of regions formed at the front and rear ends of the magnet 3, and a region formed on the side of the magnet 3 opposite the side facing the magnetoresistive elements 5.

[0131] In Fig. The magnetoresistive elements 5 are arranged between the yoke 4a and the conveyor path 2 of the object being measured 1, specifically on the north-pole side of the magnet 3 at the yoke 4a, in a central region of the magnet 3, extending in the X-direction. This means that the magnetoresistive elements 5 are arranged along a virtual line extending in the Z-direction, which is the orientation of the magnet 3 and the yoke 4a. This virtual line is omitted from the figures.

[0132] Furthermore, the central area of ​​magnet 3, the central area of ​​yoke 4a, and the central area of ​​the magnetoresistive elements 5 coincide in the X-direction. Thus, the central area of ​​magnet 3, the central area of ​​yoke 4a, and the central area of ​​the magnetoresistive elements 5 intersect the Z-axis, which passes through the origin.

[0133] The following describes the premagnetization field 6. The yoke 4a is positioned on the surface extending along the conveying direction 2 on the north-pole end of the magnet 3, and the yoke is arranged to cover the magnet 3 except for an area opposite the yoke 4a. Thus, the magnetic field from the magnetic poles passing through the yoke 4a and directed in the Z-direction becomes small, and the magnetic field directed in the X-direction becomes large.

[0134] If the magnetic sensor device is designed in this way, the magnetic field that is applied to the object being measured 1 (hard magnetic material 1a), such as paper money and the like, can be further reduced compared to embodiment 3 by the magnet 3, the yoke 4a and the yoke 4b, in the vicinity of the elements 5 with magnetoresistive effect.

[0135] Even if the object being measured 1 has a soft magnetic material that does not itself generate a magnetic field, the detection level of the soft magnetic material is further reduced, thus enabling a further distinction between the hard magnetic material and the soft magnetic material. In the following, a yoke 4c and a yoke 4d, which represent individual examples of the yoke 4d of the magnetic sensor device according to embodiment 9, are described with reference to Fig. described in sections 22 to 25.

[0136] As in Fig. 22 and Fig. As shown in 23, this is in the Fig. 20 and Fig. The yoke 4b shown in Figure 21 is divided into two parts, and although two yokes 4c are arranged in the resulting configuration, the same effect is achieved. That is to say, the Fig. 22 and Fig. The configuration of the yoke 4c shown in Figure 23 is obtained by cutting out a region of the yoke 4b, namely a region located on the side of the magnet 3 opposite the side facing the magnetoresistive elements 5, leaving the magnet 3 free through the cut-out region.

[0137] Furthermore, the same effect is achieved even in the case where no “yoke” is arranged on the side surface of the south-pole end of magnet 3, specifically on the side surface opposite the conveying surface, as in Fig. 24 and Fig. 25, is achieved, with the yoke 4d being arranged on the lateral side surface in the magnetization direction of the magnet 3. This means that the in Fig. 24 and Fig. 25. The configuration of yoke 4d shown removes the area formed on the side opposite the side facing the magnetoresistive elements 5, specifically in yoke 4b of magnet 3 of the Fig. 20 and Fig. 21 is shown. In other words, this can be seen in Fig. 24 and Fig. The yoke 4d shown in Figure 25 can be considered as merely the areas of the yoke 4b that are formed at the front end and the rear end of the magnet 3.

[0138] The yoke 4b according to Fig. 21, the yoke 4c according to Fig. 23, and the yoke 4d according to Fig. 25 compared to the yoke 4 according to Fig. 17, as described in embodiment 7, has different forms. However, due to the contact between the metal support 23 and the yoke 4a in the magnetic sensor device according to embodiment 9, heat is transferred from the yoke 4a to the magnet 3, and from the magnet 3 to the yoke 4h. Since the yoke 4b, the yoke 4c and the yoke 4d contact the spacer 25 for heat transfer, the function and effect of embodiment 9 are the same as those of embodiment 7 with regard to heat dissipation.

[0139] Furthermore, as in Fig. Figure 25 shows that the magnetic sensor device according to embodiment 9, instead of only generating contact between the yoke 4d and the spacer 25 for heat transfer, also generates contact between the magnet 3 and the spacer 25 for heat transfer. Of course, in the magnetic sensor device according to embodiment 9, only contact between the magnet 3 and the spacer 25 for heat transfer is also permissible, without contact between the yoke 4d and the spacer 25 for heat transfer. Design 10

[0140] In the following, a magnetic sensor device according to embodiment 10 of the invention is described with reference to the figures. Fig. Figure 26 is a configuration diagram of the magnetic sensor device according to embodiment 10. Fig. Figure 27 is a cross-sectional view of the magnetic sensor device according to embodiment 10, viewed in one conveying direction. Components in the Fig. 26 and Fig. 27, which are the same as or equivalent to those in the Fig. 6 to 10 and Fig. 18 and Fig. The 19 items are provided with the same reference numbers, and a description of such elements is omitted.

[0141] In Fig. 26 and Fig. 27 The magnet has 3 different magnetic poles, N-pole and S-pole, in the direction perpendicular (Z-direction) to the conveying direction 2. This means that the magnet has 3 magnetic poles that are arranged along the direction (Z-direction) orthogonal to the conveying direction 2, which represents the direction of travel of the measured object 1.

[0142] The yoke 4a is arranged on the side surface of the north-pole end of the magnet 3, extending along the conveying direction 2. This means that the yoke 4a is formed on the side of the magnet 3 opposite the magnetoresistive elements 5. The yoke 4b is the second yoke. Accordingly, the yoke 4a can be referred to as the first yoke. The yoke 4e is arranged to cover the magnet 3, except for an area opposite the yoke 4a, and projects towards the side of the conveying path 2.

[0143] In particular, the yoke 4e is formed at both ends in the X-direction, namely at the front end and at the rear end of the magnet 3. Furthermore, the yoke 4e is formed continuously from the side of the magnet 3 opposite the magnetoresistive elements 5 to the side of the magnet opposite the magnetoresistive elements 5.

[0144] This means that the yoke 4e is composed of areas formed at the front and rear ends of the magnet 3, and of an area formed on the side of the magnet 3 opposite the side facing the magnetoresistive elements 5. Furthermore, the areas formed at the front and rear ends of the magnet 3 have projecting sections in the Z-direction, extending from the magnet towards the side of the conveyor path 2.

[0145] As in the Fig. 26 and Fig. As shown in Figure 27, the height in the Z direction on the side of the conveying path 2 of the protruding sections of the yoke 4e is preferably almost the same as the height in the Z direction on the side of the conveying path 2 of the yoke 4a, from the perspective of heat dissipation. This is particularly preferred because it allows both the yoke 4a and the yoke 4e to contact the metal support 23.

[0146] Similarly, for the yoke 4f ​​and the yoke 4g described below, the height in the Z-direction on the side facing the conveying path 2 of the aforementioned sections of the yoke 4f ​​and the yoke 4g is preferably almost the same as the height in the Z-direction on the side facing the conveying path 2 of the yoke 4a, from the perspective of heat transfer. This is particularly preferred because it allows the yoke 4g and the yoke 4f, in addition to the yoke 4a, to contact the metal support 23.

[0147] In Fig. 26. The magnetoresistive elements 5 are arranged between the yoke 4a and the conveyor path 2 of the object being measured 1, specifically on the yoke 4a located on the N-pole side of the magnet 3 and in a central region of the magnet 3, as seen in the X-direction. This means that the magnetoresistive elements 5 are arranged on a virtual line extending in the Z-direction, which corresponds to the orientation of the magnet 3 and the yoke 4a.

[0148] This virtual line is omitted from the drawings. Furthermore, the central area of ​​magnet 3, the central area of ​​yoke 4a, and the central area of ​​the magnetoresistive elements 5 coincide in the X-direction. Thus, the central area of ​​magnet 3, the central area of ​​yoke 4a, and the central area of ​​the magnetoresistive elements 5 intersect the Z-axis, which passes through the origin.

[0149] The following describes the premagnetization field 6. The yoke 4a is arranged on the surface extending along the conveying direction 2, on the side of the N-pole end of the magnet 3, and the yoke 4e is arranged to cover the magnet 3 except for an area opposite the yoke 4a, and is positioned to protrude towards the side of the conveying path 2. Accordingly, the magnetic field from the magnetic pole passing through the yoke 4a and further directed in the Z direction decreases, and the magnetic field directed in the X direction increases.

[0150] If the magnetic sensor device is designed in this way, the magnetic field applied to the object being measured 1 (hard magnetic material 1a), such as paper money and the like, can be further reduced by the magnet 3, the yoke 4a and the yoke 4b, in the vicinity of the magnetoresistive elements 5, compared to embodiment 9. Even if the object being measured 1 has a soft magnetic material that does not itself generate a magnetic field, the detection level of the soft magnetic material can be further reduced, thus enabling further differentiation between the hard magnetic material and the soft magnetic material.

[0151] The following refers to the Fig. 28 to 31 describe a yoke 4f ​​and a yoke 4g, which represent individual examples of the yoke 4e of the magnetic sensor device according to embodiment 9. As in Fig. 28 and Fig. 29 shown, that is in Fig. 26 and Fig. 27 The yoke 4e shown is divided into two parts, and although two yokes 4f are arranged in the resulting configuration, the same effect is achieved.

[0152] This means that the configuration of the yoke 4f, which is in the Fig. 28 and Fig. 29 is shown, obtained by cutting out an area of ​​the yoke 4e formed on the side of the magnet 3 opposite the side opposite the magnetoresistive elements 5, the magnet 3 being exposed through the cut-out area.

[0153] Furthermore, the same effect is achieved even in the case where no "yoke" is arranged on the side surface of the south-pole end of magnet 3, specifically on the side surface opposite to that in the Fig. 30 and Fig. 31 indicated conveying surface, wherein the yoke 4g is arranged on the lateral side surface of the magnet 3 in the direction of magnetization.

[0154] This means that the ones in the Fig. 30 and Fig. 31. The configuration of yoke 4g shown removes the area formed on the side opposite the side facing the magnetoresistive elements 5, specifically in yoke 4e of the Fig. 26 and Fig. 27 magnets shown 3. In other words, this can be in the Fig. 30 and Fig. The yoke 4g shown in Figure 31 is to be regarded as merely the areas of the yoke 4e that are formed at the front end and the rear end of the magnet 3.

[0155] The yoke 4e according to Fig. 27, the yoke 4f ​​according to Fig. 29, and the yoke 4g according to Fig. 31 compared to the yoke 4 according to Fig. 17, which is described in embodiment 7, has various forms. However, in the magnetic sensor device according to embodiment 10, heat is transferred from the yoke 4a to the magnet 3, and from the magnet 3 to the yoke 4h, due to the contact between the metal carrier 23 and the yoke 4a.

[0156] In the manner described above, the yoke 4e, the yoke 4f, and the yoke 4g can be in contact with the metal support 23. Thus, because the yoke 4e, the yoke 4f, and the yoke 4g contact the spacer 25 for heat transfer, the function and effect of embodiment 10 is the same as that of embodiment 7, with regard to heat dissipation.

[0157] Furthermore, the in Fig. In the magnetic sensor device shown in Figure 31 according to embodiment 10, instead of merely establishing a contact between the yoke 4g and the spacer 25 for heat transfer, a contact can also be established between the magnet 3 and the spacer 25 for heat transfer. Of course, the magnetic sensor device according to embodiment 9 can also establish only a contact between the magnet 3 and the spacer 25 for heat transfer without establishing a contact between the yoke 4d and the spacer 25 for heat transfer. Design 11

[0158] A magnetic sensor device according to embodiment 11 of the invention is described below with reference to the figures. Fig. Figure 32 is a configuration diagram of the magnetic sensor device according to embodiment 11. Fig. Figure 33 is a cross-sectional view of the magnetic sensor device according to embodiment 11, viewed in one conveying direction. Components in the Fig. 32 and Fig. 33, which are the same as or equivalent to those in the Fig. 8, Fig. 9, Fig. 10, Fig. 18 and Fig. The 19 items are provided with the same reference numbers, and a description of such elements is omitted.

[0159] In the Fig. 32 and Fig. 33 The magnet has 3 magnetic poles that are different from each other, namely N-pole and S-pole, in the direction perpendicular (Z-direction) to the conveying direction 2. That is, the magnet has 3 magnetic poles that are arranged along the direction (Z-direction) orthogonal to the conveying direction 2, which represents the direction of travel of the measured object 1.

[0160] The yoke 4a is located on the side surface of the north-pole end of the magnet 3, extending along the conveying direction 2. This means that the yoke 4a is formed on the side of the magnet 3 opposite the magnetoresistive elements 5. The yoke 4h is the second yoke. Accordingly, the yoke 4a can be referred to as the first yoke. The yoke 4h is located on the south-pole end of the magnet 3. This means that the yoke 4h is located on the side of the magnet 3 opposite the magnetoresistive elements 5.

[0161] The length of yoke 4a in the direction (Z-direction) perpendicular to the conveying direction 2 is longer than the lengths of magnet 3 and yoke 4h in the direction (Z-direction) perpendicular to the conveying direction 2. Furthermore, the length of magnet 3 in the Z-direction is longer than the length of yoke 4h in the Z-direction. Additionally, three lengths—namely, the lengths of yoke 4a in the X-direction, the length of yoke 4h in the X-direction, and the length of magnet 3 in the X-direction—are the same.

[0162] In Fig. 32 the elements 5 with magnetoresistive effect are arranged in central areas in the X-direction width of the yoke 4a on the N-pole side of the magnet 3 and the X-direction width of the magnet 3, between the yoke 4a and the conveying path 2 of the measuring object 1.

[0163] This means that the magnetoresistive elements 5 are arranged along a virtual line extending in the Z-direction, corresponding to the orientation of magnet 3 and yoke 4a. This virtual line is omitted from the figures. Furthermore, the central region of magnet 3, the central region of yoke 4a, and the central region of the magnetoresistive elements 5 coincide in the X-direction. Thus, the central region of magnet 3, the central region of yoke 4a, and the central region of the magnetoresistive elements 5 intersect the Z-axis passing through the origin.

[0164] The premagnetization field 6 is described below. The yoke 4a is arranged on the surface extending along the conveying direction 2 of the side of the north-pole end of the magnet 3, and the yoke 4h is arranged at the south-pole end of the magnet 3. Since the length of the yoke 4a in the Z-direction is longer than that of the magnet 3, the magnetic field distribution along the path from both end regions in the conveying direction 2 of the yoke 4a to the yoke 4a and the S-pole of the magnet 3 becomes dominant for a magnetic field generated by the N-pole of the magnet 3.

[0165] In this way, the magnetic field from both ends of the yoke 4a in the conveying direction 2, directed towards the S-pole of magnet 3 and the yoke 4h formed at the south-pole end, becomes dominant. Thus, the magnetic field passing through the yoke 4a from the magnetic pole (N-pole) is not dominant and is emitted in the vertical direction (Z-direction) from the surface of the side of the yoke 4a towards the conveying path 2. Therefore, the magnetic field emitted in the Z-direction is small, and the magnetic field directed in the X-direction is large. The no magnetic field perpendicular to the conveying direction 2 is used as the premagnetization field 6.

[0166] By such a configuration of the magnetic sensor device, the magnetic field that is applied to the object being measured 1 (hard magnetic material 1a), such as paper money and the like, is further reduced by the magnet 3, the yoke 4a and the yoke 4h, in the vicinity of the elements 5 with magnetoresistive effect in the same way as in the magnetic sensor device according to embodiment 3.

[0167] Even if the object being measured has soft magnetic material that does not itself generate a magnetic field, the detection level of the soft magnetic material can be further reduced so that a distinction between the hard magnetic material and the soft magnetic material is possible.

[0168] In the Fig. 33 is a pair of yokes, namely yoke 4a and yoke 4h, arranged at the magnetic pole ends of magnet 3, with the ends oriented perpendicular to the conveying direction (Z-direction). This means that the positional relationship between the "yoke" and the metal carrier 23 is determined according to Fig. 17 different. In addition, the metal carrier 23 and the magnet 3 contact each other in Fig. 33 not, although the metal support 23 holds the magnet 3 in Fig. 17 contacted.

[0169] However, due to the contact between the metal support 23 and the yoke 4a in the magnetic sensor device according to embodiment 11, heat is transferred from the yoke 4a to the magnet 3 and from the magnet 3 to the yoke 4h. Therefore, due to the contact between the yoke 4h and the spacer 25 for heat transfer, the same functionality and effect as that of embodiment 7 can be achieved for embodiment 11.

[0170] As can be seen from the description above, the magnetic sensor device according to embodiment 11 and the magnetic sensor device according to embodiment 8 differ in the shape of the yoke 4a and the yoke 4h. Although the shape of the yoke 4a and the yoke 4h differs, the magnetic sensor device according to embodiment 11 and the magnetic sensor device according to embodiment 8 allow the use of a small magnetic field perpendicular to the conveying direction 2, namely as the premagnetization field 6. Reference symbol list 1 measuring object 1a hard magnetic material 2. Conveying path (conveying direction) 2a Detection range 34 magnets attached to the yoke 3 Magnet 4 yoke 4a Joch 4b Yoke 4c Yoke 4d yoke 4th yoke 4f yoke 4g yoke 4h Joch 5 elements with magnetoresistive effect 5a Component (first element with magnetoresistive effect) 5b Component (second element with magnetoresistive effect) 6 Premagnetization field 6x X-direction component of the premagnetization field 6V premagnetization field vector 7 hard magnetic material magnetic field 10 Magnetic sensor device for detecting soft magnetic material 11 Magnetic field 20 Shielding cover 21 cases 22 bracket 23 Non-magnetic support (metal support) 24 components for heat dissipation 25 spacers for heat transfer 101 Magnetic sensor device for detecting hard magnetic material

Claims

[1] Magnetic sensor device, characterized by , that the magnetic sensor device has the following features: a magnet (3, 34); a yoke (4, 4a) arranged on the magnet (3, 34); and an element (5) with a magnetoresistive effect to create a loss magnetic field which is emitted outwards from the yoke (4, 4a), wherein a detection area (2a) of the element (5) with a magnetoresistive effect is arranged on a side of the element (5) with a magnetoresistive effect which is opposite the magnet (3, 34); the element (5) with magnetoresistive effect is provided to detect a change in a premagnetization field (6) of the element (5) with magnetoresistive effect that occurs when a measurement object (1) having a hard magnetic material (1a) passes through the detection area (2a); and a level of the loss magnetic field that satisfies the condition that a change in the premagnetization field (6) of the element (5) with magnetoresistive effect, which occurs due to a combination of the loss magnetic field and a magnetic field which occurs due to spontaneous magnetization of the object (1), is greater than a change in the premagnetization field (6) of the element (5) with magnetoresistive effect, which occurs due to the application of the loss magnetic field to the object (1). [2] Magnetic sensor device according to claim 1, characterized by , that the magnetic poles of the magnet (3, 34) are arranged along a direction of travel of the object being measured (1); that the yoke (4, 4a) is formed both at a magnetic pole end at a front end of the magnet (3, 34) and at another magnetic pole end at a rear end of the magnet (3, 34), in the direction of travel; and that the element (5) with magnetoresistive effect is arranged on a virtual line orthogonal to the loss magnetic field, namely at an intermediate region in the direction of travel of the yoke (4, 4a) which is formed on the front end of the magnet (3, 34) and on the rear end of the magnet (3, 34). [3] Magnetic sensor device according to claim 1, characterized by , that the magnetic poles of the magnet (3, 34) are arranged along a direction orthogonal to the direction of travel of the object being measured (1); the yoke (4, 4a) is formed on a side of the magnet (3, 34) that is opposite the element (5) with magnetoresistive effect; and that the element (5) with magnetoresistive effect is arranged on a virtual line that extends in an arrangement direction of the magnet (3, 34) and the yoke (4, 4a). [4] Magnetic sensor device according to claim 3, characterized by , that it further exhibits the following: a second yoke (4b-4h) which is arranged on the magnet (3, 34), wherein the second yoke (4b-4h) is formed on one side of the magnet (3, 34) opposite the side of the magnet (3, 34) that is opposite the element (5) with magnetoresistive effect; and where the length of the second yoke (4b-4h) in the direction of passage is shorter than the length of the yoke (4, 4a) in the direction of passage. [5] Magnetic sensor device according to claim 3, characterized by , that it further exhibits the following: a second yoke (4b-4h) which is arranged on the magnet (3, 34), wherein the second yoke (4b-4h) is formed at both a front end and a rear end of the magnet (3, 34) in the direction of travel. [6] Magnetic sensor device according to claim 5, characterized by, that the second yoke (4b-4h) is formed continuously from the side of the magnet (3, 34) opposite to the element (5) with magnetoresistive effect to the side of the magnet (3, 34) which is opposite the element (5) with magnetoresistive effect. [7] Magnetic sensor device, characterized by , that it exhibits the following: a magnet (3, 34); a yoke (4, 4a) which is arranged on the magnet (3, 34); an element (5) with a magnetoresistive effect to create a loss magnetic field that is emitted outwards from the yoke (4, 4a); and a second yoke (4b-4h) which is arranged on the magnet (3, 34), wherein a detection area (2a) of the magnetoresistive element (5) is arranged on a side of the magnetoresistive element (5) opposite the magnet (3, 34); wherein the magnetoresistive element (5) is provided to detect a change in the premagnetization field (6) of the magnetoresistive element (5) that occurs when a measurement object (1a) having a hard magnetic material (1a) passes through the detection area (2a); wherein the element (5) with magnetoresistive effect is arranged on a virtual line extending in an arrangement direction of the magnet (3, 34) and the yoke (4, 4a); wherein the magnetic poles of the magnet (3, 34) are arranged along a direction orthogonal to the direction of travel of the object being measured (1); wherein the yoke (4, 4a) is arranged on one side of the magnet (3, 34), which is opposite the elements (5) with magnetoresistive effect; wherein the second yoke (4b-4h) is arranged on one side of the magnet (3, 34) opposite the side of the magnet (3) that faces the element (5) with magnetoresistive effect; and where the length of the second yoke (4b-4h) in the direction of passage is shorter than the length of the yoke (4, 4a) in the direction of passage. [8] Magnetic sensor device, characterized by , that it exhibits the following: a magnet (3, 34); a yoke (4, 4a) which is arranged on the magnet (3, 34); an element (5) with a magnetoresistive effect to create a loss magnetic field that is emitted outwards from the yoke (4, 4a); and a second yoke (4b- 4h) which is arranged on the magnet (3, 34), wherein a detection area (2a) of the magnetoresistive element (5) is arranged on a side of the magnetoresistive element (5) opposite the magnet (3, 34); wherein the magnetoresistive element (5) is provided to detect a change in a premagnetization field (6) of the magnetoresistive element (5) that occurs when a measurement object (1) having a hard magnetic material (1a) passes through the detection area (2a); wherein the element (5) with magnetoresistive effect is arranged on a virtual line extending in an arrangement direction of the magnet (3, 34) and the yoke (4, 4a); wherein the magnetic poles of the magnet (3, 34) are arranged along a direction orthogonal to the direction of travel of the object being measured (1); the yoke (4, 4a) is arranged on a side of the magnet (3, 34) that is opposite the element (5) with magnetoresistive effect; wherein the second yoke (4b-4h) is formed in the direction of travel at both a front end and a rear end of the magnet (3, 34); and wherein the second yoke (4b-4h) is formed continuously from the side of the magnet (3, 34) opposite to the element (5) with magnetoresistive effect to the side of the magnet (3, 34) which is opposite the element (5) magnetoresistive effect. [9] Magnetic sensor device according to any one of claims 1 to 8, characterized by , that the magnetoresistive element (5) has a plurality of components (5a, 5b) arranged along a longitudinal direction that intersects a conveying direction (2), wherein the conveying direction (2) is a flow direction through the detection area (2a); and that the components (5a, 5b) are inclined relative to the conveying direction (2) and the longitudinal direction. [10] Magnetic sensor device according to any one of claims 3 to 8, characterized by , that the element (5) with magnetoresistive effect has a plurality of components (5a, 5b) arranged along a longitudinal direction are which intersect a conveying direction (2), wherein the conveying direction (2) is the flow direction through the detection area (2a); that the components (5a, 5b) are inclined relative to the conveying direction (2) and the longitudinal direction; that the components (5a, 5b) are arranged in two rows extending along the longitudinal direction; and that among the components (5a, 5b) arranged in one of the two rows and in the other of the two rows, the components (5a, 5b) that are adjacent to each other in the conveying direction (2) have different inclination directions from each other. [11] Magnetic sensor device according to claim 9 or 10, characterized by , that the components (5a, 5b) which are adjacent to each other in the longitudinal direction have the same inclination.

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