Angle detection device, angle detection system, parking lock system, pedal system and magnetic field generation module

Abstract

The angle detection device of the present invention includes a magnetic detection element, a magnetic field generating member, and a yoke. The magnetic field generating member is arranged to be rotatable about a rotation axis with respect to the magnetic detection element and forms a magnetic field. The yoke is disposed in a magnetic field influence region in the rotation axis direction along the rotation axis and is arranged to be rotatable integrally with the magnetic field generating member. The magnetic field influence region is located between the magnetic field generating member and the magnetic detection element and is affected by the magnetic field.

Description

Technical Field

[0001] The present invention relates to an angle detection device, an angle detection system, a parking lock system, a pedal system, and a magnetic field generation module having a magnetic detection element. Background Art

[0002] Heretofore, an angle detection device (for example, see Patent Document 1) applicable to, for example, a throttle valve opening sensor for detecting the opening of an internal combustion engine throttle valve has been proposed.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2006-208252 Summary of the Invention

[0006] However, for such an angle detection device, improvement in angle detection accuracy is required.

[0007] Therefore, it is desired to provide an angle detection device, an angle detection system, a parking lock system, a pedal system, and a magnetic field generation module capable of achieving high detection accuracy.

[0008] An angle detection device according to an embodiment of the present invention includes a magnetic detection element, a magnetic field generation member, and a magnetic yoke. The magnetic field generation member is arranged to be rotatable about a rotation axis with respect to the magnetic detection element and forms a magnetic field. The magnetic yoke is arranged in a magnetic field influence region in a rotation axis direction along the rotation axis, and is arranged to be rotatable integrally with the magnetic field generation member. The magnetic field influence region is located between the magnetic field generation member and the magnetic detection element and is affected by the magnetic field.

[0009] An angle detection system according to an embodiment of the present invention includes the above-described angle detection device and a support for supporting the magnetic field generation member. The support has a mounting hole, and the magnetic yoke is provided on the magnetic field generation member or the support.

[0010] A parking lock system according to an embodiment of the present invention includes the above-described angle detection system.

[0011] A pedal system according to an embodiment of the present invention includes the above-described angle detection system.

[0012] A magnetic field generation module according to an embodiment of the present invention includes a magnetic field generation member and a magnetic yoke. The magnetic field generation member is arranged to be rotatable about a rotation axis. The magnetic yoke is arranged in a region different from the region where the magnetic field generation member is provided in a rotation axis direction along the rotation axis, and is arranged to be rotatable integrally with the magnetic field generation member. Brief Description of the Drawings

[0013] Figure 1 It is a schematic perspective view showing an overall structure example of an angle detection system representing an embodiment of the present invention.

[0014] Figure 2 It is Figure 1 a plan view of a magnetic field generation module in the angle detection device shown.

[0015] Figure 3 It is Figure 1 a front view of a magnetic field generation module in the angle detection device shown.

[0016] Figure 4 It is a schematic contour map of the magnetic flux density distribution in the rotational axis direction of the angle detection system of Experimental Example 1-1.

[0017] Figure 5A It is a characteristic diagram showing the rotational angle correlation of the magnetic flux density of the detection target magnetic field applied to the magnetic detection element in the angle detection system of Experimental Example 1-1.

[0018] Figure 5B It is a characteristic diagram showing the difference in the magnetic flux density of the detection target magnetic field applied to a plurality of magnetic detection elements respectively in the angle detection system of Experimental Example 1-1.

[0019] Figure 5C It is a characteristic diagram showing the error of the rotational angle detected by each of a plurality of magnetic detection elements in the angle detection system of Experimental Example 1-1.

[0020] Figure 6 It is a schematic contour map of the magnetic flux density distribution in the rotational axis direction of the angle detection system of Experimental Example 1-2.

[0021] Figure 7A It is a characteristic diagram showing the rotational angle correlation of the magnetic flux density of the detection target magnetic field applied to the magnetic detection element in the angle detection system of Experimental Example 1-2.

[0022] Figure 7B It is a characteristic diagram showing the difference in the magnetic flux density of the detection target magnetic field applied to a plurality of magnetic detection elements respectively in the angle detection system of Experimental Example 1-2.

[0023] Figure 7C It is a characteristic diagram showing the error of the rotational angle detected by each of a plurality of magnetic detection elements in the angle detection system of Experimental Example 1-2.

[0024] Figure 8 It is a schematic contour map of the magnetic flux density distribution in the rotational axis direction of the angle detection system of Experimental Example 1-3.

[0025] Figure 9AIt is a characteristic diagram showing the rotational angle correlation of the magnetic flux density of the magnetic field to be detected applied to the magnetic detection element in the angle detection systems of Experimental Examples 1-3.

[0026] Figure 9B It is a characteristic diagram showing the difference in the magnetic flux density of the magnetic field to be detected applied to a plurality of magnetic detection elements respectively in the angle detection systems of Experimental Examples 1-3.

[0027] Figure 9C It is a characteristic diagram showing the error of the rotational angle detected by each of the plurality of magnetic detection elements in the angle detection systems of Experimental Examples 1-3.

[0028] Figure 10 It is a schematic contour map of the magnetic flux density distribution in the rotational axis direction of the angle detection system of Experimental Example 2-1.

[0029] Figure 11A It is a characteristic diagram showing the rotational angle correlation of the magnetic flux density of the magnetic field to be detected applied to the magnetic detection element in the angle detection system of Experimental Example 2-1.

[0030] Figure 11B It is a characteristic diagram showing the difference in the magnetic flux density of the magnetic field to be detected applied to a plurality of magnetic detection elements respectively in the angle detection system of Experimental Example 2-1.

[0031] Figure 11C It is a characteristic diagram showing the error of the rotational angle detected by each of the plurality of magnetic detection elements in the angle detection system of Experimental Example 2-1.

[0032] Figure 12 It is a schematic contour map of the magnetic flux density distribution in the rotational axis direction of the angle detection system of Experimental Example 2-2.

[0033] Figure 13A It is a characteristic diagram showing the rotational angle correlation of the magnetic flux density of the magnetic field to be detected applied to the magnetic detection element in the angle detection system of Experimental Example 2-2.

[0034] Figure 13B It is a characteristic diagram showing the difference in the magnetic flux density of the magnetic field to be detected applied to a plurality of magnetic detection elements respectively in the angle detection system of Experimental Example 2-2.

[0035] Figure 13C It is a characteristic diagram showing the error of the rotational angle detected by each of the plurality of magnetic detection elements in the angle detection system of Experimental Example 2-2.

[0036] Figure 14 It is a schematic contour map of the magnetic flux density distribution in the rotational axis direction of the angle detection device of Experimental Example 2-3.

[0037] Figure 15AIt is a characteristic diagram showing the rotational angle correlation of the magnetic flux density of the magnetic field to be detected applied to the magnetic detection element in the angle detection system of Experimental Example 2-3.

[0038] Figure 15B It is a characteristic diagram showing the difference in the magnetic flux density of the magnetic field to be detected applied to a plurality of magnetic detection elements respectively in the angle detection system of Experimental Example 2-3.

[0039] Figure 15C It is a characteristic diagram showing the error of the rotational angle detected by each of the plurality of magnetic detection elements in the angle detection system of Experimental Example 2-3.

[0040] Figure 16 It is a perspective view showing the appearance of the magnetic field generation module as the first modification example.

[0041] Figure 17 It is a perspective view showing the appearance of the magnetic field generation module as the second modification example.

[0042] Figure 18 It is a perspective view showing the appearance of the magnetic field generation module as the third modification example.

[0043] Figure 19 It is a perspective view showing the appearance of the magnetic field generation module as the fourth modification example.

[0044] Figure 20A It is a first schematic diagram of a parking lock system as the first application example of the angle detection device to which one embodiment of the present invention is applied.

[0045] Figure 20B It is a second schematic diagram of a parking lock system as the first application example of the angle detection device to which one embodiment of the present invention is applied.

[0046] Figure 21A It is a first schematic diagram of a pedal system as the second application example of the angle detection device to which one embodiment of the present invention is applied.

[0047] Figure 21B It is a second schematic diagram of a pedal system as the second application example of the angle detection device to which one embodiment of the present invention is applied.

[0048] Figure 22 It is a front view showing the appearance of the magnetic field generation module as the fifth modification example.

[0049] Figure 23 It is a front view showing the appearance of the magnetic field generation module as the sixth modification example.

[0050] Figure 24 It is a perspective view showing the appearance of the angle detection system as the first reference example.

[0051] Figure 25 It is a perspective view showing the appearance of the angle detection system as the second reference example.

[0052] Symbol Explanation

[0053] 100 Angle detection system

[0054] 10 Angle detection device

[0055] 1 Sensor section

[0056] 2 Magnetic field generation module

[0057] 3, 4 Support

[0058] 11 - 13 Magnetic detection elements

[0059] 20 Magnetic field generation section

[0060] 21, 22 Magnets

[0061] 30 Yoke section

[0062] 31, 32 Yokes Detailed Implementation Modes

[0063] Hereinafter, the implementation modes for carrying out the present invention will be described in detail with reference to the accompanying drawings. All of the implementation modes described below represent a specific example preferred for the present invention. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions of the constituent elements, connection forms, etc. shown in the following implementation modes are merely examples and are not intended to limit the present invention. Therefore, the constituent elements in the following implementation modes that are not described in the independent claims representing the most general concept of the present invention are described as optional constituent elements. Further, each of the accompanying drawings is merely a schematic diagram, and the illustration is not necessarily precise. In addition, in each of the accompanying drawings, the same reference numerals are assigned to substantially the same structures, and repeated explanations are omitted or simplified. Further, the description will be made in the following order.

[0064] 1. One implementation mode

[0065] 2. Experimental example

[0066] 3. Modification example

[0067] 4. Application example

[0068] 5. Other modification examples

[0069] <1. One implementation mode>

[0070] [Structure of the angle detection system 100]

[0071] First, refer toFigures 1 to 3 The structure of the angle detection system 100 as an embodiment of the present invention will be described.

[0072] Figure 1 is a perspective view showing an example of the overall structure of the angle detection system 100. Figure 2 is a plan view showing the mutual positional relationship in a plane orthogonal to the rotation axis J1 (described later) of the components in the magnetic field generation module 2 (described later) in the angle detection system 100. Furthermore, the "orthogonal" as used in this application includes not only the concept of complete orthogonality, i.e., intersecting at 90°, but also the concept of approximate orthogonality (e.g., intersecting at about 90° ± 5°). Therefore, Figure 1 the shown plan view can also represent a plane that is slightly deviated from 90° with respect to the rotation axis J1. In Figure 2 it shows the state of viewing the magnetic field generation module 2 from the sensor unit 1 (described later). Among them, in Figure 2 the outlines of the magnetic detection elements 11 to 13 (described later) included in the sensor unit 1 and the outline of the support 4 (described later) that supports the magnetic field generation module 2 are also respectively shown by dashed lines. Figure 3 is a front view of the magnetic field generation module 2 viewed from the front, i.e., in the direction orthogonal to the rotation axis J1. Among them, in Figure 3 the support 4 is also shown. The angle detection system 100 is a device for detecting the rotation angle of a rotating member that performs a rotation operation, and can be applied to a throttle opening sensor for detecting, for example, the throttle opening of an internal combustion engine mounted on an automobile or the like.

[0073] As shown in Figure 1 the angle detection system 100 includes, for example, an angle detection device 10, a support 3, and a support 4. The angle detection device 10 includes, for example, a sensor unit 1 and a magnetic field generation module 2. The sensor unit 1 is supported by the support 3, for example, and the magnetic field generation module 2 is supported by the support 4, for example. The magnetic field generation module 2 includes, for example, a magnetic field generation unit 20 and a yoke unit 30. The magnetic field generation unit 20 has a magnetic field generation member that forms a detection target magnetic field to be detected in the sensor unit 1, and is arranged so as to be able to rotate around the rotation axis J1 with respect to the sensor unit 1 in the rotation direction R1, for example. The sensor unit 1 has a plurality of magnetic detection elements that detect, for example, the intensity of the detection target magnetic field formed by the magnetic field generation member, the direction of the detection target magnetic field, and the like. The yoke unit 30 is arranged in the magnetic field influence region in the rotation axis direction, and is arranged so as to be able to rotate integrally with the magnetic field generation unit 20. The magnetic field influence region is between the magnetic field generation unit 20 and the sensor unit 1 and is affected by the detection target magnetic field.

[0074] (Sensor unit 1)

[0075] The sensor unit 1 as shown in Figure 2As shown, there are, for example, three magnetic detection elements 11 to 13 as multiple magnetic detection elements. The magnetic detection elements 11 to 13 are arranged at mutually different positions within a plane orthogonal to the rotation axis direction around the rotation axis J1. The central position CP equidistant from each of the magnetic detection elements 11 to 13 preferably coincides with the position of, for example, the rotation axis J1. That is, each of the magnetic detection elements 11 to 13 can be equidistant from the rotation axis J1. The magnetic detection elements 11 to 13 are elements such as Hall elements that can detect the intensity and direction of a magnetic field. All of the magnetic detection elements 11 to 13 have a sensitivity axis along the rotation axis J1. In the case where the magnetic detection elements 11 to 13 are Hall elements, for example, each of the magnetic detection elements 11 to 13 can detect the magnetic field intensity along the rotation axis J1. Based on the magnetic field intensity in the rotation axis direction detected in each of the magnetic detection elements 11 to 13, angle information can be obtained by performing an arithmetic expression shown in Equation (1) below.

[0076] [Equation (1)]

[0077]

[0078] In Equation (1), φ is the rotation angle of the magnetic field generation module 2, and V1 to V3 are output voltages corresponding to the magnetic field intensity along the rotation axis J1 detected in the magnetic detection elements 11 to 13. Further, as a non-contact type angle detection device using multiple Hall elements, it is described in the specification of U.S. Patent No. 9,933,279.

[0079] (Magnetic field generation unit 20)

[0080] The magnetic field generation unit 20 includes, for example, magnets 21 and 22 as magnetic field generation members. Both the magnets 21 and 22 can have a shape having substantially only flat surfaces such as a substantially cubic shape or a substantially rectangular parallelepiped shape. The magnets 21 and 22 are arranged separately from each other around the rotation axis J1. For example, the distance between the magnet 21 and the rotation axis J1 can be equal to the distance between the magnet 22 and the rotation axis J1. The distance between the magnet 21 and the rotation axis J1 and the distance between the magnet 22 and the rotation axis J1 as Figure 2 shown are, for example, the distance D21 between the geometric center position P21 of the magnet 21 on a plane orthogonal to the rotation axis J1 and the rotation axis J1 and the distance D22 between the geometric center position P22 of the magnet 22 and the rotation axis J1. In addition, the materials, shapes, and sizes of the magnets 21 and 22 can be substantially the same. The magnets 21 and 22 can be arranged at rotationally symmetric positions with respect to the rotation axis J1 in a manner of facing each other with the rotation axis J1 interposed therebetween. Further, as Figure 3 shown, both the magnets 21 and 22 are magnetized in the rotation axis direction. As the constituent materials of the magnets 21 and 22, for example, neodymium-based magnet materials such as NdFeB and rare earth magnet materials such as SmCo can be cited.

[0081] (Yoke portion 30)

[0082] The yoke portion 30 has, for example, yokes 31 and 32 that are arranged separately from each other around the rotation axis J1. The yokes 31 and 32 each have a planar shape in a cross section orthogonal to the rotation axis J1, and this planar shape is curved in an arc shape along the rotation direction R1, which is the direction of rotation around the rotation axis J1. The central angle of the arc-shaped yokes 31, 32 as viewed from the rotation axis J1 is preferably, for example, 106° or more and 110° or less, more preferably 107° or more and 109° or less. However, the central angle of the arc-shaped yokes 31, 32 can be set corresponding to the rotation angle range. The yokes 31 and 32 can be arranged at positions that are rotationally symmetric with respect to the rotation axis J1 so as to face each other with the rotation axis J1 in between. The yokes 31 and 32 are respectively in positions that overlap with the magnets 21 and 22 in the rotation axis direction. In addition, as Figure 3 shown, the yokes 31 and 32 are respectively arranged in contact with the magnets 21 and 22. In addition, for example, the distance between the yoke 31 and the rotation axis J1 can be equal to the distance between the yoke 32 and the rotation axis J1. The distance between the yoke 31 and the rotation axis J1 and the distance between the yoke 32 and the rotation axis J1 as Figure 2 shown are, for example, the distance D31 between the geometric center position P31 of the yoke 31 and the rotation axis J1 and the distance D32 between the geometric center position P32 of the yoke 32 and the rotation axis J1 on a plane orthogonal to the rotation axis J1. Furthermore, in the magnetic field generation module 2 of the present embodiment, an example is given where the center position P31 of the yoke 31 coincides with the center position P21 of the magnet 21, and the center position P32 of the yoke 32 coincides with the center position P22 of the magnet 22, that is, the case where all of the distances D21, D22, D31, D32 are the same. And the materials, shapes, and sizes of the yokes 31 and 32 are substantially the same. Here, the height dimension H21 of the magnet 21 in the rotation axis direction is larger than the height dimension H31 of the yoke 31 in the rotation axis direction. Similarly, the height dimension H22 of the magnet 22 in the rotation axis direction is larger than the height dimension H32 of the yoke 32 in the rotation axis direction. As the constituent materials of the yokes 31 and 32, for example, soft magnetic materials such as NiFe can be cited.

[0083] (Support 4)

[0084] The support body 4 is a member for supporting the magnets 21 and 22, and has a shape such as a disc shape. The support body 4 is configured to have, for example, a mounting hole 4K at its center and can be mounted on a rotating body by screws or the like. When the angle detection system 100 is applied as the throttle valve opening sensor described above, the support body 4 is connected to the rotating body, that is, the rotating shaft of the throttle valve, and the support body 3 is fixed to an internal combustion engine frame or the like. The magnetic yokes 31 and 32 are fixed to the magnets 21 and 22. However, the magnetic yokes 31 and 32 may also be directly fixed to the support body 4. In either case, it is arranged such that the magnetic field generation unit 20 and the magnetic yoke unit 30 can rotate integrally with the support body 4 along the rotation direction R1.

[0085] [Operation of the angle detection system 100]

[0086] In the angle detection system 100, if the rotating body (for example, the rotating shaft of the throttle valve) on which the support body 4 is mounted rotates, then the support body 4, the magnetic field generation unit 20, and the magnetic yoke unit 30 rotate integrally along the rotation direction R1. Along with this, the direction of the detection target magnetic field (magnetic flux) of the sensor unit 1 changes periodically. As a result, in the magnetic detection elements 11 to 13 of the sensor unit 1, magnetic fields (magnetic fluxes) whose intensities change in a sine curve corresponding to the rotation angle of the magnetic field generation module 2 can be detected respectively. Therefore, from the intensity values of the magnetic fields (magnetic fluxes) detected respectively in the magnetic detection elements 11 to 13, the rotation angle of the rotating body on which the magnetic field generation module 2 is fixed can be obtained. However, since the magnetic detection elements 11 to 13 are arranged at different positions from each other along the rotation direction R1 with respect to the rotation center of the magnetic field generation module 2, that is, the rotation axis J1, the phases of the sine curves formed by the magnetic field intensities detected by the magnetic detection elements 11 to 13 deviate from each other.

[0087] [Advantages of the angle detection system 100]

[0088] As described above, the angle detection system 100 of the above-described embodiment includes the sensor unit 1, the magnets 21, 22, and the magnetic yokes 31, 32. The sensor unit 1 includes the magnetic detection elements 11 to 13; the magnets 21, 22 are arranged to be rotatable about the rotation axis J1 with respect to the sensor unit 1 and form a detection target magnetic field; the magnetic yokes 31, 32 are arranged in the magnetic field influence region affected by the detection target magnetic field between the magnets 21, 22 and the magnetic detection elements 11 to 13 in the rotation axis direction, and are arranged to be rotatable integrally with the magnets 21, 22. Therefore, compared with the case where there is no magnetic yoke as in the angle detection system 101 shown as the first reference example, the angle detection accuracy is improved. Further, Figure 24 The angle detection system 101 shown as the first reference example has the same structure as the angle detection system 100 of the present embodiment except that there are no magnetic yokes 31, 32. Figure 24 ​

[0089] In addition, as in the angle detection system 102 of the second reference example shown as Figure 25 below, when the magnetic field generation unit 20 has a substantially cylindrical magnet 23 instead of the magnets 21 and 22, the volume of the cylindrical magnet 23 of the angle detection system 102 tends to be larger than the total volume of the dispersed magnets 21 and 22. In view of this, since in the angle detection system 100 according to the present embodiment, the yoke unit 30 is provided between the magnetic field generation unit 20 and the sensor unit 1, it is possible to maintain the angle detection accuracy of the sensor unit 1 to be the same as that of the angle detection system 102, and to make the total volume of the magnets 21 and 22 smaller than the volume of the magnet 23. For this reason, it is beneficial for weight reduction and miniaturization.

[0090] In addition, in the angle detection system 102 of the second reference example, in order to detect the rotation angle of the magnetic field generation module 2 in the sensor unit 1, it is necessary to make the magnetization direction of the cylindrical magnet 23 be in the direction along the plane orthogonal to the rotation axis direction. However, since it is not easy to distinguish from the appearance which direction the magnetization direction of the cylindrical magnet 23 is, there may be problems when correctly aligning the initial relative positions of the sensor unit 1 and the magnet 23. In contrast, in the angle detection system 100 according to the present embodiment, it is easy to distinguish the magnetization directions of the magnets 21 and 22 from their respective arrangement positions and respective shapes, and it has excellent operability during assembly and the like.

[0091] In addition, as in the angle detection system 100 of the above embodiment, when the yokes 31 and 32 are respectively arranged in the rotation axis direction at positions overlapping the magnets 21 and 22, compared with the case where the yokes 31 and 32 are respectively arranged in the rotation axis direction at positions not overlapping the magnets 21 and 22, the magnetic flux collecting effect of the yokes 31 and 32 is improved, and the deviation of the intensity distribution of the magnetic field to be detected, that is, the magnetic flux density distribution, in the region near the sensor unit 1 is reduced. As a result, the angle detection accuracy is further improved.

[0092] In addition, as in the angle detection system 100 of the above embodiment, when the yokes 31 and 32 are respectively arranged in contact with the magnets 21 and 22 in the rotation axis direction, compared with the case where the yokes 31 and 32 are respectively arranged separately from the magnets 21 and 22, the magnetic flux collecting effect of the yokes 31 and 32 is improved, and the deviation of the intensity distribution of the magnetic field to be detected, that is, the magnetic flux density distribution, in the region near the sensor unit 1 is reduced. As a result, the angle detection accuracy is further improved.

[0093] In addition, as in the angle detection system 100 of the above-described embodiment, when the height dimensions H21 and H22 of the magnets 21 and 22 in the rotation axis direction are respectively larger than the height dimensions H31 and H32 of the yokes 31 and 32 in the rotation axis direction, a good balance can be maintained between the volumes of the magnets 21 and 22 and the volumes of the yokes 31 and 32. Therefore, a detection target magnetic field of higher intensity can be effectively supplied to the sensor unit 1, and it is beneficial to reduce the size of the whole, particularly in the rotation axis direction.

[0094] In addition, as in the angle detection system 100 of the above-described embodiment, when the magnets 21 and 22 are magnetized in the rotation axis direction, a detection target magnetic field in the rotation axis direction can be effectively applied to the magnetic detection elements 11 to 13 having a sensitivity axis along the rotation axis direction.

[0095] In addition, according to the angle detection system 100 of the above-described embodiment, since both the magnets 21 and 22 have a substantially cubic shape or a substantially rectangular parallelepiped shape, the workability in manufacturing the magnets 21 and 22 is excellent compared to magnets having, for example, an arc shape, which is beneficial for, for example, mass production.

[0096] In addition, as in the angle detection system 100 of the above-described embodiment, when the magnetic field generation unit 20 has a pair of magnets 21 and 22 arranged separately around the rotation axis J1, compared with the case where the magnetic field generation unit 20 has only one magnet, the total volume of the magnets 21 and 22 can be reduced without degrading the angle detection accuracy, and weight reduction can be achieved.

[0097] In addition, in the angle detection system 100 of the above-described embodiment, when the materials, shapes, and sizes of the magnet 21 and the magnet 22 are substantially the same as each other, the angle detection accuracy can be further improved compared to the case where they are different from each other. Also, when the distance D21 and the distance D22 are the same, the angle detection accuracy can be further improved compared to the case where the distance D21 and the distance D22 are different. This is because the deviation of the detection target magnetic field applied to the sensor unit 1 due to the rotation angle of the magnetic field generation module 2 can be reduced in this way.

[0098] In addition, as in the angle detection system 100 of the above-described embodiment, when the yokes 31 and 32 have a planar shape that is curved in an arc shape along the rotation direction R1 on a plane orthogonal to the rotation axis J1, the angle detection accuracy can be further improved compared to the case where the yokes 31 and 32 have a planar shape that extends linearly, for example. This is because the deviation of the detection target magnetic field applied to the sensor unit 1 due to the rotation angle of the magnetic field generation module 2 can be reduced in this way.

[0099] In addition, when the yoke portion 30 has yokes 31 and 32 that are separately arranged around the rotation axis J1, weight reduction can be achieved compared to a case where, for example, the yoke 31 and the yoke 32 are connected to form a single circular ring.

[0100] In addition, when the yokes 31 and 32 are arranged at positions rotationally symmetric with respect to the rotation axis J1, the angle detection accuracy can be further improved compared to a case where they are not arranged at rotationally symmetric positions. Also, when the distance D31 and the distance D32 are the same, the angle detection accuracy can be further improved compared to a case where the distance D31 and the distance D32 are different. All of these are because this can reduce the deviation of the rotation angle of the magnetic field generation module 2 in the detection target magnetic field applied to the sensor unit 1.

[0101] <2. Experimental Example>

[0102] Next, for Figure 1 the angle detection system 100 of the above-described embodiment shown in Figure 24 and Figure 25 the performance of the angle detection systems 101 and 102 of the reference examples shown respectively was compared.

[0103] (Experimental Example 1-1)

[0104] In the angle detection system 100 described in the above embodiment, by simulation, the change in the magnetic flux density detected in the sensor unit 1 when a noise magnetic field with an intensity of 5 mT is applied in the rotation axis direction and the rotation operation of the magnetic field generation module 2 is performed was obtained. Here, by simulation, the case where on the plane orthogonal to the rotation axis J1, each of the magnetic detection elements 11 to 13 deviates 1 mm to the right direction of the paper surface from the original position 11A to 13A, that is, the case where the center position CP equidistant from each of the magnetic detection elements 11 to 13 deviates 1 mm in the direction of the magnetic detection element 11 from the original position, which is the position overlapping the rotation axis J1, of the sensor unit 1 was obtained. In addition, the magnets 21 and 22 are neodymium magnets (rare earth magnets mainly composed of neodymium, iron, and boron), the size of each of the magnets 21 and 22 is 6.0 mm × 2.5 mm × 5.0 mm, and the distances D21 and D22 are 4.75 mm. In addition, the materials of the arc-shaped yokes 31 and 32 are SPCC (ordinary steel), the central angles of the yokes 31 and 32 are each 108°, and the height dimensions H31 and H32 of the yokes 31 and 32 are each 0.85 mm. And the distances between the yokes 31 and 32 in the rotation axis direction and the magnetic detection elements 11 to 13 are 1 mm.

[0105] Figure 4It is a schematic contour map of the magnetic flux density distribution in the rotational axis direction on the sensing surface of the angle detection system 100 in Experimental Example 1-1. The sensing surface refers to the surface that is orthogonal to the rotational axis J1 and includes the magnetic detection elements 11 to 13. Furthermore, Figure 4 represents the state where the rotation angle is 0°. In Figure 4 the Experimental Example 1-1 shown, the contour lines indicating the magnetic flux density extend at least in the longitudinal direction of the paper surface along the opposing surfaces of the pair of magnets 21 and 22 in the regions corresponding to the magnetic detection elements 11 to 13. Therefore, it can be understood that a magnetic field with a relatively uniform intensity (magnetic flux density) can be applied to the magnetic detection elements 11 to 13. Thus, it can be understood that it is beneficial for improving the angle detection accuracy by the magnetic detection elements 11 to 13.

[0106] Figure 5A It is a characteristic diagram showing the relationship between the magnetic flux density [mT] of the detection target magnetic field applied to the magnetic detection elements 11 to 13 and the rotation angle [deg] of the magnetic field generation module 2 in the angle detection system 100 in Experimental Example 1-1. In Figure 5A it, the curve B11 represents the rotation angle correlation of the magnetic flux density of the detection target magnetic field detected by the magnetic detection element 11, the curve B12 represents the rotation angle correlation of the magnetic flux density of the detection target magnetic field detected by the magnetic detection element 12, and the curve B13 represents the rotation angle correlation of the magnetic flux density of the detection target magnetic field detected by the magnetic detection element 13.

[0107] Figure 5B It represents Figure 5A a characteristic diagram showing how the differences between the curves B11 to B13 shown change according to the rotation angle [deg] of the magnetic field generation module 2. In Figure 5B it, the curve Δ1 is Figure 5A the difference between the curve B11 and the curve B12, the curve Δ2 is Figure 5A the difference between the curve B12 and the curve B13, and the curve Δ3 is Figure 5A the difference between the curve B13 and the curve B11.

[0108] Figure 5C It represents the error of the rotation angle of the magnetic field generation module 2 obtained from Figure 5B the curves Δ1 to Δ3 shown. In this experimental example, the maximum value (absolute value) of the error is suppressed to 0.2° or less.

[0109] (Experimental Example 1-2)

[0110] Next, the angle detection system 101 as the first reference example shown in Figure 24 was also evaluated under the same conditions as in the above Experimental Example 1-1. Figure 6This is a schematic contour map of the magnetic flux density distribution in the direction of the rotation axis on the above-mentioned sensing surface of the angle detection system 101 in Experimental Example 1-2. Furthermore, Figure 6 represents a state where the rotation angle is 0°. In the Experimental Example 1-2 as shown in Figure 6 , compared with the Experimental Example 1-1 as shown in Figure 4 , it shows that the isolines of the magnetic flux density are more curved in the longitudinal direction of the paper surface along the opposing surfaces of the pair of magnets 21 and 22 as they are farther away from the rotation axis J1. Therefore, a magnetic field with a relatively large deviation in intensity (magnetic flux density) is applied to the magnetic detection elements 11 to 13. Therefore, it can be seen that the angle detection accuracy by the magnetic detection elements 11 to 13 will be reduced.

[0111] Figure 7A This is a characteristic diagram showing the relationship between the magnetic flux density [mT] of the detection target magnetic field applied to the magnetic detection elements 11 to 13 and the rotation angle [deg] of the magnetic field generation module 2 in the angle detection system 101 in Experimental Example 1-2.

[0112] Figure 7B This is to show Figure 7A how the mutual differences of the curves B11 to B13 as shown change according to the rotation angle [deg] of the magnetic field generation module 2.

[0113] Figure 7C This represents the error in the rotation angle of the magnetic field generation module 2 obtained from the curves Δ1 to Δ3 as shown in Figure 7B . In this experimental example, the maximum value (absolute value) of the error is 4.9°.

[0114] (Experimental Example 1-3)

[0115] Next, the same evaluation was also carried out on the angle detection system 102 as the second reference example as shown in Figure 25 under the same conditions as in Experimental Example 1-1 above. Figure 8 This is a schematic contour map of the magnetic flux density distribution in the direction of the rotation axis on the above-mentioned sensing surface of the angle detection system 102 in Experimental Example 1-3. Furthermore, Figure 8 represents a state where the rotation angle is 0°. In the Experimental Example 1-3 as shown in Figure 8 , compared with the Experimental Example 1-1 as shown in Figure 4 , it shows that the isolines of the magnetic flux density are slightly more curved in the longitudinal direction of the paper surface along the opposing surfaces of the pair of magnets 21 and 22 as they are farther away from the rotation axis J1. Therefore, compared with Experimental Example 1-1, it can be seen that in Experimental Example 1-3, the angle detection accuracy by the magnetic detection elements 11 to 13 slightly decreases.

[0116] Figure 9AIt is a characteristic diagram showing the relationship between the magnetic flux density [mT] of the magnetic field to be detected applied to the magnetic detection elements 11 to 13 in the angle detection system 102 as Experimental Examples 1-3 and the rotation angle [deg] of the magnetic field generation module 2.

[0117] Figure 9B It shows Figure 9A a characteristic diagram showing how the mutual differences of the curves B11 to B13 shown change according to the rotation angle [deg] of the magnetic field generation module 2.

[0118] Figure 9C It shows the error in the rotation angle of the magnetic field generation module 2 obtained from the Figure 9B curves Δ1 to Δ3 shown. In this experimental example, the maximum value (absolute value) of the error is 0.6°.

[0119] (Experimental Example 2-1)

[0120] Next, in the Figure 1 angle detection system 100 described in the above embodiment, by simulation, it was obtained that: when a noise magnetic field with an intensity of 5 mT is applied in a direction orthogonal to the rotation axis J1 and the magnetic field generation module 2 is rotated, the change in the magnetic flux density detected in the sensor unit 1. Except for the different direction of the noise magnetic field, other evaluations were carried out under the same conditions as Experimental Example 1-1 in the same manner as Experimental Example 1-1. Figure 10 It is a schematic contour map of the magnetic flux density distribution in the rotation axis direction on the above sensing surface of the angle detection system 100 as Experimental Example 2-1. Furthermore, Figure 10 it shows the state where the rotation angle is 0°. In the Figure 10 Experimental Example 2-1 shown as Figure 4 in the same manner as Experimental Example 1-1 shown, it shows that the isocontours of the magnetic flux density extend at least in the longitudinal direction of the paper along the opposing surfaces of the pair of magnets 21 and 22 in the region corresponding to the magnetic detection elements 11 to 13. Therefore, it can be seen that a magnetic field with a relatively uniform intensity (magnetic flux density) can be applied to the magnetic detection elements 11 to 13. Therefore, it can be seen that it is beneficial to improve the angle detection accuracy by the magnetic detection elements 11 to 13.

[0121] Figure 11A It is a characteristic diagram showing the relationship between the magnetic flux density [mT] of the magnetic field to be detected applied to the magnetic detection elements 11 to 13 in the angle detection system 100 as Experimental Example 2-1 and the rotation angle [deg] of the magnetic field generation module 2.

[0122] Figure 11B It shows Figure 11A a characteristic diagram showing how the mutual differences of the curves B11 to B13 shown change according to the rotation angle [deg] of the magnetic field generation module 2.

[0123] Figure 11C Indicates from Figure 11B The curves Δ1 to Δ3 shown in the figure show the errors in the rotation angle of the magnetic field generating module 2. In this experimental example, the maximum value (absolute value) of the error is 0.45°.

[0124] (Experimental Example 2-2)

[0125] Secondly, Figure 24 The angle detection system 101 shown as the first reference example was also evaluated in the same manner under the same conditions as those of the above-described Experimental Example 2-1. Figure 12 2 is a schematic contour diagram of the magnetic flux density distribution in the rotation axis direction on the sensing surface of the angle detection system 101 of Experimental Example 2-2. Figure 12 Indicates the state where the rotation angle is 0°. Figure 12 In the experimental example 2-2 shown in FIG. Figure 10 Compared with the experimental example 2-1 shown, the more the contour lines of the magnetic flux density are away from the rotation axis J1, the more they are bent in the longitudinal direction of the paper along the opposing surfaces of the pair of magnets 21 and 22. Therefore, a magnetic field with a large deviation in intensity (magnetic flux density) will be applied to the magnetic detection elements 11 to 13. Therefore, it is known that the angle detection accuracy performed by the magnetic detection elements 11 to 13 will be reduced.

[0126] Figure 13A This is a characteristic diagram showing the relationship between the magnetic flux density [mT] of the detection target magnetic field applied to the magnetic detection elements 11 to 13 and the rotation angle [deg] of the magnetic field generation module 2 in the angle detection system 101 as Experimental Example 2-2.

[0127] Figure 13B Yes means Figure 13A The characteristic diagram shows how the mutual differences of the curves B11 to B13 change according to the rotation angle [deg] of the magnetic field generating module 2 .

[0128] Figure 13C Indicates from Figure 13B The curves Δ1 to Δ3 shown in the figure show the errors in the rotation angle of the magnetic field generating module 2. In this experimental example, the maximum value (absolute value) of the error is 5.1°.

[0129] (Experimental Example 2-3)

[0130] Secondly, Figure 25 The angle detection system 102 shown as the second reference example was also evaluated in the same manner under the same conditions as those of the above-mentioned Experimental Example 2-1. Figure 14 : is a schematic contour diagram of the magnetic flux density distribution in the rotation axis direction on the above-mentioned sensing surface of the angle detection system 102 of Experimental Example 2-3. Figure 14Indicates a state where the rotation angle is 0°. In Experimental Example 2-3 as shown in Figure 14 , compared with Experimental Example 2-1 as shown in Figure 10 , it is shown that the isomagnetic flux density lines are more bent in the longitudinal direction of the paper surface along the opposing surfaces of the pair of magnets 21 and 22 as they are farther from the rotation axis J1. Therefore, compared with Experimental Example 2-1, it can be seen that in Experimental Example 2-3, the angle detection accuracy by the magnetic detection elements 11 to 13 is slightly decreased.

[0131] Figure 15A is a characteristic diagram showing the relationship between the magnetic flux density [mT] of the detection target magnetic field applied to the magnetic detection elements 11 to 13 and the rotation angle [deg] of the magnetic field generation module 2 in the angle detection system 102 as Experimental Example 2-3.

[0132] Figure 15B Indicates Figure 15A how the mutual differences of the curves B11 to B13 as shown change according to the rotation angle [deg] of the magnetic field generation module 2.

[0133] Figure 15C Indicates the error of the rotation angle of the magnetic field generation module 2 obtained from the curves Δ1 to Δ3 as shown in Figure 15B . In this experimental example, the maximum value (absolute value) of the error is 0.85°.

[0134] In this way, it is confirmed that the angle detection system 100 according to the present embodiment can ensure high angle detection accuracy and achieve weight reduction and miniaturization.

[0135] <3. Modification Example>

[0136] (First Modification Example)

[0137] Figure 16 is a perspective view showing the appearance of the magnetic field generation module 2A as the first modification example of the above-described embodiment of the present invention. The yokes 31 and 32 of the magnetic field generation module 2 described in the above embodiment all have an arc-shaped planar shape. In contrast, the magnetic field generation module 2A as the first modification example has yokes 31A and 32A having a substantially triangular planar shape. The yokes 31A and 32A are arranged such that their opposing end faces are substantially parallel to each other. In this first modification example, the same operational effects as those of the above-described embodiment can also be expected. And according to this first modification example, compared with the yokes 31 and 32 having an arc-shaped planar shape, it is easier to manufacture the yokes 31A and 32A, and when these yokes 31A and 32A are mounted on the magnets 21 and 22, it is easier to determine and fix their relative positions.

[0138] (Second Modification Example)

[0139] Figure 17 This is a perspective view showing the appearance of the magnetic field generation module 2B as the second modification of the above-described embodiment of the present invention. The magnetic field generation module 2B as the second modification has yokes 31B and 32B having a substantially semi-circular planar shape. The yokes 31B and 32B are arranged such that their opposing end faces are substantially parallel to each other. In this second modification, the same operational effects as those of the above-described embodiment can also be expected.

[0140] (Third Modification)

[0141] Figure 18 This is a perspective view showing the appearance of the magnetic field generation module 2C as the third modification of the above-described embodiment of the present invention. The magnetic field generation module 2C as the third modification has a single yoke 30C having a substantially circular-ring planar shape. The yoke 30C is commonly provided for the magnets 21 and 22, and is directly or indirectly provided on the magnets 21 and 22, respectively. That is, the yoke 30C may be in contact with the magnets 21 and 22, respectively, or may be mounted on the magnets 21 and 22 via one or more other components, respectively. In this third modification, the same operational effects as those of the above-described embodiment can also be expected. Further, according to this third modification, compared with the yokes 31 and 32 having an arcuate planar shape, it is easier to manufacture the yoke 30C, and the number of components can be reduced.

[0142] (Fourth Modification)

[0143] Figure 19 This is a perspective view showing the appearance of the magnetic field generation module 2D as the fourth modification of the above-described embodiment of the present invention. The magnetic field generation module 2D as the fourth modification has the same structure as the magnetic field generation module 2 of the above-described embodiment, except that magnets 21D and 22D are provided instead of the magnets 21 and 22. The magnets 21D and 22D each include a stepped portion T21 and a stepped portion T22 at their upper ends. The yokes 31 and 32 are respectively mounted on the stepped portion T21 and the stepped portion T22. Thus, according to the magnetic field generation module 2D as the fourth modification, since the stepped portions T21 and T22 are provided, when the yokes 31 and 32 are mounted on the magnets 21D and 22D, it becomes easy to determine and fix the relative positions of the yokes 31 and 32 with respect to the magnets 21D and 22D. In addition, a reduction in height can be achieved. Also, in this fourth modification, the same operational effects as those of the above-described embodiment can be expected.

[0144] <4. Application Example>

[0145] (First Application Example)

[0146] Figure 20A and Figure 20B is a schematic diagram of a parking lock system 200 having the angle detection system 100 described in the above embodiment. The parking lock system 200 is a mechanism that, for example, is mounted on a vehicle such as an automobile and suppresses the movement of the vehicle by setting the shift lever in the parking mode when the driver parks the vehicle in a parking lot or the like. Figure 20A represents an unlocked state of unlocking, Figure 20B represents a locked state. The parking lock system 200 includes, for example, a motor 202 disposed inside a housing 201, a shaft 203, a control lever 204, a rod 205, an engaging portion 206, and a parking gear 208 having gear teeth 207. The shaft 203 extends, for example, in a direction perpendicular to the paper surface and is arranged to be rotatable by the motor 202. The angle detection system 100 of the above embodiment is provided at an end of the shaft 203 to detect the rotation angle of the shaft 203. The base end of the control lever 204 extending parallel to the paper surface is fixed to the shaft 203, and the control lever 204 rotates along the paper surface by the drive of the motor 202. The base end of the rod 205 is mounted at the front end of the control lever 204, and the rod 205 moves in the left-right direction of the paper surface by the rotation of the control lever 204. The engaging portion 206 provided at the front end of the rod 205 can engage with and disengage from the gear teeth 207. In this parking lock system 200, by switching from Figure 20A the unlocked state shown to Figure 20B the locked state shown, the rotation of the parking gear 208 is restricted. Specifically, if the shaft 203 and the control lever 204 rotate to the right in the paper surface by the rotation of the motor 202, then the rod 205 slides to the right direction of the paper surface, the engaging portion 206 engages with the gear teeth 207, and the parking gear 208 is locked. Conversely, by switching from Figure 20B the locked state shown to Figure 20A the unlocked state shown, the restriction on the rotation of the parking gear 208 is released. Specifically, if the shaft 203 and the control lever 204 rotate to the left in the paper surface by the rotation of the motor 202, then the rod 205 slides to the left direction of the paper surface, the engaging portion 206 separates from the gear teeth 207, and the locking of the parking gear 208 is released. Here, by detecting the rotation angle of the shaft 203 by the angle detection system 100 of the above embodiment, it is possible to accurately distinguish whether the parking gear 208 is in the locked state or the unlocked state.

[0147] (Second Application Example)

[0148] Figure 21A and Figure 21B is a schematic diagram of a pedal system 300 having the angle detection system 100 described in the above embodiment. Figure 21A represents an initial state in which the pad 303B (described later) of the pedal 303 is not operated, Figure 21BIndicates the depressed state in which the pad 303B is manipulated.

[0149] The pedal system 300 includes: for example, a housing 301, a shaft 302 fixed to the housing 301, a pedal 303, and a biasing member 304 such as a tension spring. The pedal 303 includes a bearing portion 303A through which the shaft 302 is inserted, and is arranged to be rotatable about the shaft 302 at the bearing portion 303A.

[0150] The pedal 303 includes: for example, a pad 303B manipulated by the driver's foot, a rod (arm) 303C connecting the pad 303B and the bearing portion 303A, and a control rod 303D provided on the opposite side of the rod 303C sandwiching the bearing portion 303A. The control rod 303D is connected to the biasing member 304 and is pulled and pressed by the biasing member 304 so as to approach the wall portion 301W of the housing 301.

[0151] The angle detection system 100 provided near the bearing portion 303A correctly detects the rotation angle of the rod 303C rotating about the shaft 302, and sends a voltage signal (proportional signal) corresponding to the rotation angle to the control device 305. The control device 305 analyzes the voltage signal and controls the throttle valve opening / closing operation with a throttle valve opening corresponding to the voltage signal.

[0152] In this pedal system 300, in Figure 21A the shown initial state, by the driver depressing the pad 303B, the pedal 303 rotates counterclockwise about the shaft 302 in the plane of the paper and switches to the Figure 21B shown depressed state. At this time, the throttle valve opening increases. Conversely, by the driver reducing the depression amount of the pad 303B or stopping the depression, the pedal returns from the Figure 21B shown depressed state to the Figure 21A shown initial state. At this time, the throttle valve opening decreases.

[0153] In this way, in the pedal system 300, since the rotation angle of the rod 303C can be correctly detected by the angle detection system 100 of the above-described embodiment, the throttle valve opening can be adjusted with high precision.

[0154] <5. Other Modification Examples>

[0155] As described above, although the present invention has been illustrated by way of embodiments and several modification examples, the present invention is not limited to the above-described embodiments and the like, and various changes can be made. For example, although in the above-described embodiments and the like, a vertical Hall element has been illustrated as an example of a magnetic detection element, the magnetic detection element of the present invention may be any element having a function of detecting a magnetic field, and concepts including, for example, magnetoresistive effect elements (MR elements) such as anisotropic magnetoresistive effect elements (AMR elements), spin valve type giant magnetoresistive effect (GMR) elements, and tunneling magnetoresistive effect (TMR) elements are also included. In the case of using MR elements such as GMR elements and TMR elements, it is possible to detect changes in the direction and intensity of a magnetic field in a plane orthogonal to the rotation axis J1. In the present invention, since it is possible not only to reduce the deviation of the magnetic field intensity distribution (magnetic flux density distribution) in the rotation axis direction but also to reduce the deviation of the magnetic field intensity distribution (magnetic flux density distribution) in a plane orthogonal to the rotation axis, it is also possible to consider applying it to a magnetic detection element that detects changes in the direction and intensity of a magnetic field in a plane orthogonal to the rotation axis J1, such as an MR element. In addition, the dimensions of each component, the design of each component, etc. are merely examples and are not limited thereto.

[0156] In addition, although in the above-described embodiments and the like, a case where the sensor unit 1 of the angle detection device 10 has three magnetic detection elements 11 to 13 has been illustrated as an example, the present invention is not limited thereto. The angle detection device of the present invention may, for example, have only one magnetic detection element, may have two magnetic detection elements, or may have four or more magnetic detection elements.

[0157] In addition, although in the above-described embodiments and the like, a case where the magnetic field generation unit 20 of the angle detection device 10 has two magnets as magnetic field generation members has been illustrated as an example, the present invention is not limited thereto. The angle detection device of the present invention may, for example, have only one magnetic field generation member, or may have three or more magnetic field generation members.

[0158] In addition, in the angle detection device of the present invention, it is also possible to have a magnetic yoke 31E and a magnetic yoke 32E as in the magnetic field generation module 2E shown as a fifth modification example, and the magnetic yokes 31E and 32E each have an inverted trapezoidal shape in a cross section along the rotation axis J1, with a larger width as they are farther away from the magnets 21 and 22. In this case, the magnetic fluxes from the magnets 21 and 22 spread over a wider range by expanding in the magnetic yokes 31E and 32E. Furthermore, as in the magnetic field generation module 2F shown as a sixth modification example, when a single cylindrical magnet 23 is provided, it is also possible to have a magnetic yoke 30F, and the magnetic yoke 30F has an inverted trapezoidal shape with a larger width as it is farther away from the magnet 23. Figure 22 shown, Figure 23 shown,

[0159] According to the angle detection device, angle detection system, parking lock system, pedal system, and magnetic field generation module as an embodiment of the present invention, high detection accuracy can be achieved.

[0160] Furthermore, the present technology can also adopt the following structure. (1)

[0162] An angle detection device includes:

[0163] A magnetic detection element;

[0164] A magnetic field generating member arranged to be rotatable about a rotation axis with respect to the magnetic detection element and to form a magnetic field; and

[0165] A magnetic yoke arranged in a magnetic field influence region in a rotation axis direction along the rotation axis and arranged to be rotatable integrally with the magnetic field generating member, the magnetic field influence region being between the magnetic field generating member and the magnetic detection element and being affected by the magnetic field. (2)

[0167] The angle detection device according to (1) above, wherein

[0168] The magnetic yoke is in a position overlapping the magnetic field generating member in the rotation axis direction. (3)

[0170] The angle detection device according to (1) or (2) above, wherein

[0171] The magnetic yoke is arranged in contact with the magnetic field generating member. (4)

[0173] The angle detection device according to any one of (1) to (3) above, wherein

[0174] The height dimension of the magnetic field generating member in the rotation axis direction is larger than the height dimension of the magnetic yoke in the rotation axis direction. (5)

[0176] The angle detection device according to any one of (1) to (4) above, wherein

[0177] The magnetic field generating member is magnetized in the rotation axis direction. (6)

[0179] The angle detection device according to any one of (1) to (5) above, wherein

[0180] The magnetic field generating member has a substantially cubic shape or a substantially rectangular parallelepiped shape. (7)

[0182] The angle detection device according to any one of (1) to (6) above, wherein,

[0183] The magnetic field generating member is a plurality of magnetic field generating members that are arranged separately from each other around the rotation axis. (8)

[0185] The angle detection device according to (7) above, wherein,

[0186] The materials, shapes, and sizes of the plurality of magnetic field generating members are substantially the same. (9)

[0188] The angle detection device according to (7) or (8) above, wherein,

[0189] The distances of the plurality of magnetic field generating members from the rotation axis are substantially equal. (10)

[0191] The angle detection device according to any one of (7) to (9) above, wherein,

[0192] The plurality of magnetic field generating members include a first magnetic field generating member and a second magnetic field generating member that are opposed to each other with the rotation axis therebetween. (11)

[0194] The angle detection device according to any one of (1) to (10) above, wherein,

[0195] The cross-section of the magnetic yoke along the rotation axis includes an inverted trapezoidal shape, and the inverted trapezoidal shape has a width that expands as it is farther from the magnetic field generating member. (12)

[0197] The angle detection device according to any one of (1) to (11) above, wherein,

[0198] The magnetic yoke has a planar shape on a plane orthogonal to the rotation axis, and the planar shape is curved in an arc shape along the direction of rotation centered on the rotation axis. (13)

[0200] The angle detection device according to any one of (1) to (12) above, wherein,

[0201] The magnetic yoke is a plurality of magnetic yokes that are arranged separately from each other around the rotation axis. (14)

[0203] The angle detection device according to (13) above, wherein,

[0204] The materials, shapes, and sizes of the plurality of yokes are substantially the same. (15)

[0206] The angle detection device according to (13) or (14), wherein

[0207] The distances of the plurality of yokes from the rotation axis are substantially equal. (16)

[0209] The angle detection device according to any one of (13) to (15), wherein

[0210] The plurality of yokes include a first yoke and a second yoke that face each other across the rotation axis. (17)

[0212] The angle detection device according to any one of (1) to (16), wherein

[0213] The magnetic detection element has a sensitivity axis along the rotation axis direction. (18)

[0215] The angle detection device according to any one of (1) to (17), wherein

[0216] The magnetic detection element is a plurality of magnetic detection elements. (19)

[0218] The angle detection device according to (18), wherein

[0219] The plurality of magnetic detection elements are arranged at different positions in a plane orthogonal to the rotation axis direction. (20)

[0221] An angle detection system, comprising:

[0222] The angle detection device according to any one of (1) to (19); and

[0223] A support for supporting the magnetic field generating member,

[0224] The support has a mounting hole,

[0225] The yoke is provided on the magnetic field generating member or the support. (21)

[0227] A parking lock system having the angle detection system according to (20). (22)

[0229] A pedal system having the angle detection system described above (20). (23)

[0231] A magnetic field generation module includes:

[0232] A magnetic field generation member configured to be rotatable about a rotation axis; and

[0233] A yoke disposed in a region different from the region where the magnetic field generation member is provided in the rotation axis direction along the rotation axis, and configured to be rotatable integrally with the magnetic field generation member. (24)

[0235] The magnetic field generation module described above (23), wherein

[0236] A first height dimension of the magnetic field generation member in the rotation axis direction is larger than a second height dimension of the yoke in the rotation axis direction.

[0237] This disclosure contains the subject matter disclosed in Japanese Priority Patent Application JP2020-116002 filed with the Japan Patent Office on July 3, 2020, the entire content of which is incorporated herein by reference.

[0238] Those skilled in the art should understand that although various modifications, combinations, sub-combinations, and alternatives may occur depending on design requirements and other factors, they are all within the scope of the appended claims or their equivalents.

Claims

1. An angle detection device, comprising: A magnetic detection element; A magnetic field generating member, which is arranged to be rotatable about a rotation axis with respect to the magnetic detection element and forms a magnetic field; and A yoke, which is arranged in a magnetic field influence region in the rotation axis direction along the rotation axis and is arranged to be rotatable integrally with the magnetic field generating member. The magnetic field influence region is between the magnetic field generating member and the magnetic detection element and is affected by the magnetic field. The magnetic field generating member has a first magnetic field generating member and a second magnetic field generating member that are opposed to each other with the rotation axis interposed therebetween. The first magnetic field generating member and the second magnetic field generating member are magnetized in the rotation axis direction respectively. The yoke has a first yoke and a second yoke that are opposed to each other with the rotation axis interposed therebetween. The first yoke is in a position overlapping with the first magnetic field generating member in the rotation axis direction. The second yoke is in a position overlapping with the second magnetic field generating member in the rotation axis direction. The first yoke and the second yoke each have a planar shape that is curved in an arc shape along the direction of rotation about the rotation axis on both the side close to the rotation axis and the side far from the rotation axis on a plane orthogonal to the rotation axis.

2. An angle detection device, comprising: A magnetic detection element; A magnetic field generating member, which is arranged to be rotatable about a rotation axis with respect to the magnetic detection element and forms a magnetic field; and A yoke, which is arranged in a magnetic field influence region in the rotation axis direction along the rotation axis and is arranged to be rotatable integrally with the magnetic field generating member. The magnetic field influence region is between the magnetic field generating member and the magnetic detection element and is affected by the magnetic field. The magnetic field generating member has a first magnetic field generating member and a second magnetic field generating member that are opposed to each other with the rotation axis interposed therebetween. The first magnetic field generating member and the second magnetic field generating member are magnetized in the rotation axis direction respectively. The yoke has a first yoke and a second yoke that are opposed to each other with the rotation axis interposed therebetween. The first yoke is arranged to be in contact with the first magnetic field generating member in the rotation axis direction. The second yoke is arranged to be in contact with the second magnetic field generating member in the rotation axis direction. The first yoke and the second yoke each have a planar shape that is curved in an arc shape along the direction of rotation about the rotation axis on both the side close to the rotation axis and the side far from the rotation axis on a plane orthogonal to the rotation axis.

3. The angle detection device according to claim 1 or claim 2, wherein The height dimension of the magnetic field generating member in the rotation axis direction is larger than the height dimension of the yoke in the rotation axis direction.

4. The angle detection device according to claim 1 or claim 2, wherein The magnetic field generating member has a substantially cubic shape or a substantially rectangular parallelepiped shape.

5. The angle detection device according to claim 1 or claim 2, wherein The magnetic field generating member is a plurality of magnetic field generating members that are separately arranged around the rotation axis.

6. The angle detection device according to claim 5, wherein The materials, shapes, and sizes of the respective plurality of magnetic field generating members are substantially the same.

7. The angle detection device according to claim 5, wherein The respective distances of the plurality of magnetic field generating members from the rotation axis are substantially equal.

8. The angle detection device according to claim 5, wherein The plurality of magnetic field generating members include the first magnetic field generating member and the second magnetic field generating member.

9. The angle detection device according to claim 1 or claim 2, wherein The cross-section of the yoke along the rotation axis includes an inverted trapezoidal shape having a width that expands as it is farther from the magnetic field generating member.

10. The angle detection device according to claim 1 or claim 2, wherein The yoke is a plurality of yokes arranged separately from each other around the rotation axis.

11. The angle detection device according to claim 10, wherein The materials, shapes, and sizes of the respective plurality of yokes are substantially the same.

12. The angle detection device according to claim 10, wherein The respective distances of the plurality of yokes from the rotation axis are substantially equal.

13. The angle detection device according to claim 10, wherein The plurality of yokes include the first yoke and the second yoke.

14. The angle detection device according to claim 1 or claim 2, wherein The magnetic detection element has a sensitivity axis in the direction of the rotation axis.

15. The angle detection device according to claim 1 or claim 2, wherein The magnetic detection element is a plurality of magnetic detection elements.

16. The angle detection device according to claim 15, wherein The plurality of magnetic detection elements are arranged at mutually different positions in a plane orthogonal to the direction of the rotation axis.

17. An angle detection system, comprising: The angle detection device according to any one of claims 1 to 16; and A support that supports the magnetic field generating member, The support has a mounting hole, The yoke is provided on the magnetic field generating member or the support.

18. A parking lock system having the angle detection system according to claim 17.

19. A pedal system having the angle detection system according to claim 17.

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