Magnetic sensor device and rotation detection device

Abstract

When a plurality of magnetic sensors are mounted on a substrate in order to detect rotation of a rotating body using the plurality of magnetic sensors, the present invention suppresses displacement of disposition between the plurality of magnetic sensors, and reduces man-hours for mounting work. A magnetic sensor device (3) is provided with: a plurality of magnetic sensors (4) each having a magnetic wire (5) that plays a large Barkhausen effect, and a coil provided on the outer peripheral side of the magnetic wire (5); and a housing (16) to which each of the plurality of magnetic sensors (4) is fixed, the plurality of magnetic sensors (4) being arranged at predetermined intervals in the circumferential direction around a reference line orthogonal to a reference surface on the same reference surface as the lower surface of the housing (16) and so that the direction in which the magnetic lines (5) extend is parallel to the reference surface.

Description

Technical Field

[0001] The present invention relates to a magnetic sensor device utilizing a large Barkhausen effect, and a rotation detection device including the magnetic sensor device. Background Art

[0002] A magnetic sensor using the large Barkhausen effect has a magnetic wire that exerts the large Barkhausen effect and a coil disposed on the outer periphery of the magnetic wire. Specifically, the magnetic sensor is provided with a bobbin for determining the positions of the magnetic wire and the coil, the magnetic wire is disposed inside the shaft of the bobbin, and the coil is formed by winding an electric wire around the outer periphery of the shaft of the bobbin. An example of such a magnetic sensor is described in International Publication No. 2016 / 021074 (Patent Document 1).

[0003] For example, as described in International Publication No. 2016 / 021074, when a magnetic sensor is used to detect the rotation of a rotating body such as a rotating shaft, a magnet is fixed to the outer periphery of the rotating body, and when the rotating body rotates, a rotating magnetic field is formed on the outer periphery of the rotating body. In addition, a substrate is provided on the outer periphery of the rotating body in a manner that does not contact either the rotating body or the magnet, and a plurality of magnetic sensors are provided on the substrate. In addition, a plurality of magnetic sensors are arranged near the rotating track of the magnet and at positions different from each other in the direction of rotation of the magnet. Thus, the rotating magnetic field formed by the rotation of the rotating body can be detected by means of a plurality of magnetic sensors, and the rotation amount and direction of rotation of the rotating body can be detected based on the detection signals output from the coils of each magnetic sensor.

[0004] Patent document: International Publication No. 2016 / 021074

[0005] When a plurality of magnetic sensors are used to detect the rotation of a rotating body, in order to improve the detection accuracy, it is required to improve the configuration accuracy of the plurality of magnetic sensors on the substrate. However, in the prior art, since the plurality of magnetic sensors are independently mounted on the substrate, the configuration of the plurality of magnetic sensors on the substrate is sometimes offset. In addition, the operation of independently mounting the plurality of magnetic sensors on the substrate consumes time. Summary of the invention

[0006] The present invention is completed in view of the above-mentioned problems, for example, and the subject of the present invention is to provide a magnetic sensor device and a rotation detection device that can suppress the configuration offset between the multiple magnetic sensors and reduce the working hours of the installation operation when the multiple magnetic sensors are installed on a substrate in order to use the multiple magnetic sensors to detect the rotation of a rotating body.

[0007] In order to solve the above-mentioned problems, the magnetic sensor device of the present invention is characterized in that it comprises: a plurality of magnetic sensors having magnetic wires that exert a large Barkhausen effect, and coils arranged on the outer peripheral side of the magnetic wires; and a housing for fixing the plurality of magnetic sensors respectively, wherein the plurality of magnetic sensors are arranged on a reference plane that is the same as or parallel to the lower surface of the housing, around a reference line orthogonal to the reference plane, at prescribed intervals in the circumferential direction and in a manner such that the extension direction of the magnetic wires is parallel to the reference plane.

[0008] When a plurality of magnetic sensors are used to detect the rotation of a rotating body, for example, a magnet is fixed to the outer periphery of the rotating body, and when the rotating body rotates, a rotating magnetic field is formed on the outer periphery of the rotating body. In addition, a substrate is arranged on the outer periphery of the rotating body in a manner that does not contact either the rotating body or the magnet. The substrate is arranged in a manner that a plane including its mounting surface is orthogonal to the axis of rotation of the rotating body. Then, the magnetic sensor device of the present invention is arranged on the mounting surface of the substrate. When the magnetic sensor device of the present invention is arranged on the mounting surface of the substrate, for example, the lower surface of the housing is placed on the mounting surface of the substrate. In addition, the configuration of the housing on the mounting surface of the substrate is determined in such a manner that the above-mentioned reference line is consistent with the axis of rotation of the rotating body. Since a plurality of magnetic sensors are fixed to the housing, by configuring the housing on the mounting surface of the substrate, the configuration between the plurality of magnetic sensors can be determined on the mounting surface of the substrate. Thereafter, the housing or each magnetic sensor is fixed to the substrate.

[0009] In the magnetic sensor device of the present invention, a plurality of magnetic sensors are arranged on a reference plane that is the same as or parallel to the lower surface of the housing, around a reference line orthogonal to the reference plane, at a predetermined interval in the circumferential direction and in a manner that the extension direction of the magnetic line is parallel to the above-mentioned reference plane. Therefore, by placing the lower surface of the housing on the mounting surface of the substrate and determining the configuration of the housing on the mounting surface of the substrate in a manner that makes the above-mentioned reference line coincide with the rotation axis of the rotating body, it is possible to configure the plurality of magnetic sensors on the same or parallel surface as the mounting surface of the substrate, and further, the plurality of magnetic sensors can be arranged on the outer peripheral side of the rotating track of the magnet at predetermined intervals in the rotation direction of the magnet, and further, the plurality of magnetic sensors can be arranged in a manner that the extension direction of the magnetic line is parallel to the mounting surface of the substrate. That is, by merely configuring the housing on the mounting surface of the substrate as described above, it is possible to determine the configuration of the plurality of magnetic sensors on the substrate that can detect the rotation of the rotating body. Therefore, according to the magnetic sensor device of the present invention, when a plurality of magnetic sensors are mounted on a substrate in order to detect the rotation of a rotating body using the plurality of magnetic sensors, the configuration offset between the plurality of magnetic sensors can be suppressed compared to the prior art in which the plurality of magnetic sensors are independently mounted on the substrate, and further, the man-hours for the installation operation can be reduced.

[0010] In addition, in the magnetic sensor device of the present invention, a plurality of magnetic yokes for controlling the direction of the magnetic flux of the external magnetic field may be provided, the plurality of magnetic yokes being arranged in a one-to-one correspondence with the plurality of magnetic sensors, and the plurality of magnetic yokes being fixed to the housing together with the plurality of magnetic sensors. In this case, the plurality of magnetic yokes may be integrated with the housing by insert molding.

[0011] In order to solve the above-mentioned problems, the rotation detection device of the present invention is a rotation detection device for detecting the rotation of a rotating body, characterized by comprising: the magnetic sensor device of the present invention; a magnetic field forming member that rotates together with the rotating body and forms a rotating magnetic field on the outer peripheral side of the rotating body when the rotating body rotates; and a substrate having a mounting surface, which is arranged near the magnetic field forming member in such a manner that the mounting surface faces upward and a plane including the mounting surface is orthogonal to the rotation axis and does not contact either the rotating body or the magnetic field forming member, and the housing of the magnetic sensor device is fixed to the substrate in such a manner that the reference line is aligned with the rotation axis of the rotating body and the lower surface of the housing is parallel to the mounting surface, and is arranged on the mounting surface or above the mounting surface. In the rotation detection device, the housing of the magnetic sensor device is fixed to the substrate in such a manner that the reference line is aligned with the rotation axis of the rotating body and the lower surface of the housing is parallel to the mounting surface of the substrate, and is arranged on the mounting surface of the substrate or above the mounting surface of the substrate. Specifically, the housing is fixed to the substrate in a state where it is placed on the mounting surface of the substrate in such a manner that the reference line is aligned with the rotation axis of the rotating body and the lower surface of the housing is in contact with the mounting surface of the substrate, or is fixed to the substrate in a state where it is arranged above the mounting surface of the substrate in such a manner that the reference line is aligned with the rotation axis of the rotating body and the lower surface of the housing is parallel to the mounting surface of the substrate.

[0012] According to the present invention, when a plurality of magnetic sensors are mounted on a substrate in order to detect the rotation of a rotating body using the plurality of magnetic sensors, it is possible to suppress displacement of the arrangement of the plurality of magnetic sensors and reduce the number of man-hours required for mounting work. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an explanatory diagram showing a state of a rotation detection device including a magnetic sensor device according to an embodiment of the present invention, as viewed from above.

[0014] Figure 2 It means along Figure 1 A cross-sectional view of a cross section of the rotation detection device cut along the cutting line II-II in FIG.

[0015] Figure 3 It is a perspective view showing a magnetic sensor device and a substrate according to an embodiment of the present invention.

[0016] Figure 4 It is an explanatory diagram showing a state of the magnetic sensor device according to the embodiment of the present invention as viewed from below.

[0017] Figure 5 (A) is a perspective view showing a state of the magnetic sensor in the magnetic sensor device according to the embodiment of the present invention as viewed from the upper front right. Figure 5 (B) is a perspective view showing the magnetic sensor as viewed from the upper rear right side.

[0018] Figure 6 This is a perspective view showing a bobbin in the magnetic sensor of the magnetic sensor device according to the embodiment of the present invention, as seen from the upper front right.

[0019] Figure 7 This is a perspective view showing a state of the magnetic sensor and the yoke in the magnetic sensor device according to the embodiment of the present invention as viewed from the upper front right.

[0020] Figure 8 It is an explanatory diagram showing a method of attaching a magnetic sensor to a housing in the magnetic sensor device according to the embodiment of the present invention.

[0021] Fig. 9 It is an explanatory diagram showing the arrangement of the magnetic sensor and the yoke in the casing of the magnetic sensor device according to the embodiment of the present invention.

[0022] Fig.10 It is an explanatory diagram showing the arrangement of the magnetic sensor and the yoke in the casing of the magnetic sensor device according to the embodiment of the present invention.

[0023] Fig.11 It is an explanatory diagram showing the magnetic field detection operation of the magnetic sensor and the like in the magnetic sensor device according to the embodiment of the present invention.

[0024] Fig.12 It is an explanatory diagram showing a first modified example of the magnetic sensor device according to the embodiment of the present invention.

[0025] Fig.13 It is an explanatory diagram showing a second modified example of the magnetic sensor device according to the embodiment of the present invention.

[0026] Fig.14 It is an explanatory diagram showing a third modified example of the magnetic sensor device according to the embodiment of the present invention.

[0027] Description of Reference Numerals

[0028] 1…rotation detection device; 2…magnetic field forming component; 3, 51…magnetic sensor device; 4…magnetic sensor; 5…magnetic wire; 12…coil; 15…yoke; 16, 52…housing; 31…substrate; 31A…mounting surface; 40…rotation axis (rotating body); Q…reference line; S…reference plane. DETAILED DESCRIPTION

[0029] (Rotation detection device)

[0030] Figure 1 The rotation detection device 1 including the magnetic sensor device 3 according to the embodiment of the present invention is shown as viewed from above. Figure 2 Shown along Figure 1 The cross section of the rotation detection device 1 cut along the cutting line II-II in FIG. Figure 1 The middle is the state of observation.

[0031] exist Figure 1 The rotation detection device 1 is a device that detects the rotation of a rotating shaft 40 as a rotating body. The rotation detection device 1 includes a magnetic field forming member 2 that forms a rotating magnetic field, a magnetic sensor device 3 that detects the rotating magnetic field, and a substrate 31 .

[0032] The magnetic field forming member 2 is formed into a ring shape by a magnetic material such as ferrite. The magnetic field forming member 2 is arranged coaxially with the rotating shaft 40 on the outer peripheral side of the rotating shaft 40 and is fixed to the rotating shaft 40. The magnetic field forming member 2 is a magnet that has undergone multi-pole magnetization. In the outer peripheral side portion of the magnetic field forming member 2, four magnetic poles of N pole, S pole, N pole, and S pole are formed in this order, for example, at intervals of 90 degrees in the circumferential direction of the magnetic field forming member 2. In addition, the magnetic field forming member 2 can also be formed by four magnets that are not subjected to multi-pole magnetization.

[0033] The substrate 31 is disposed on the outer peripheral side of the rotating shaft 40. In addition, the substrate 31 is disposed near the magnetic field forming member 2. The substrate 31 is arranged in such a manner that its mounting surface 31A faces upward. Figure 2 As shown, the substrate 31 is arranged in such a manner that a plane including the mounting surface 31A is orthogonal to the rotation axis X of the rotating shaft 40. In addition, a through hole 31B is formed in the central portion of the substrate 31, and the rotating shaft 40 is inserted into the through hole 31B. The center of the through hole 31B coincides with the rotation center of the rotating shaft 40. In addition, the diameter of the through hole 31B is larger than the outer diameter of the rotating shaft 40, and the rotating shaft 40 does not contact the substrate 31. In addition, the substrate 31 is fixed to a housing or the like of a device (such as a motor) that supports the rotating shaft 40 so that it can rotate, via a bracket or the like.

[0034] As described later, the magnetic sensor device 3 is formed by housing and fixing three magnetic sensors 4 and three yokes 15 in one housing 16. Figure 1, three magnetic sensors 4 and three yokes 15 housed in the housing 16 are shown by dotted lines. The magnetic sensor device 3 is arranged on the mounting surface 31A of the substrate 31 by aligning the reference line Q in the housing 16 with the rotation axis X of the rotation axis 40 and placing the lower surface of the housing 16 on the mounting surface 31A of the substrate 31. In addition, the magnetic sensor device 3 is fixed to the substrate 31 by welding the fixing metal fitting 22 provided in the housing 16 to the fixing pad 32 provided on the mounting surface 31A of the substrate 31.

[0035] In the state where the magnetic sensor device 3 is arranged on the mounting surface 31A of the substrate 31 in this way, the three magnetic sensors 4 are arranged on the mounting surface 31A of the substrate 31. In addition, the three magnetic sensors 4 are arranged on the outer peripheral side of the magnetic field forming member 2 at intervals of 120 degrees in the rotation direction of the magnetic field forming member 2. In addition, each magnetic sensor 4 is arranged in a manner that the extension direction of the magnetic wire 5 is parallel to the mounting surface 31A of the substrate 31. In addition, when the mounting surface 31A of the substrate 31 is observed from above, each magnetic sensor 4 is arranged so that the central part of the extension direction of the magnetic wire 5 (strictly speaking, the central part in the extension direction of the central axis of the magnetic wire 5) is tangent to the circle D drawn on the outer peripheral side of the magnetic field forming member 2 with the rotation center of the rotation axis 40 as the center.

[0036] In addition, in a state where the magnetic sensor device 3 is arranged on the mounting surface 31A of the substrate 31 as described above, three yokes 15 are arranged on the mounting surface 31A of the substrate. The three yokes 15 are arranged in a one-to-one correspondence with the three magnetic sensors 4. In addition, the three yokes 15 are arranged on the outer peripheral side of the magnetic field forming member 2 at intervals of 120 degrees in the rotation direction of the magnetic field forming member 2. In addition, each yoke 15 is arranged on the inner peripheral side of the magnetic sensor 4 in a manner adjacent to the magnetic sensor 4.

[0037] The magnetic field forming component 2 does not contact any of the three magnetic sensors and the three magnetic yokes. In addition, the magnetic field forming component 2 rotates together with the rotating shaft 40, while the magnetic sensor device 3 does not move. If the magnetic field forming component 2 rotates together with the rotating shaft 40, the magnetic field formed by the magnetic field forming component 2 rotates. As a result, a rotating magnetic field rotating around the rotation axis X of the rotating shaft 40 is formed. The three magnetic sensors 4 detect the rotating magnetic field. Specifically, the direction of the magnetic field acting on each magnetic sensor 4 changes by rotating the magnetic field formed by the magnetic field forming component 2. Each magnetic sensor 4 outputs a pulse signal corresponding to the change in the direction of the magnetic field. Based on the pulse signal output from each magnetic sensor 4, the rotation amount and rotation direction of the rotating shaft 40 can be detected.

[0038] (Magnetic sensor device)

[0039] Figure 3The magnetic sensor device 3 and the substrate 31 before being mounted on the substrate 31 are shown as viewed from an oblique upper lateral side. Figure 4 The magnetic sensor device 3 is shown as viewed from below.

[0040] The magnetic sensor device 3 includes three magnetic sensors 4, three magnetic yokes 15, and a housing 16. The magnetic sensor device 3 is a device in which the three magnetic sensors 4 and the three magnetic yokes 15 are integrated via the housing 16. Figure 3 As shown, three magnetic sensors 4 and three magnetic yokes 15 are housed and fixed in a housing 16. Specifically, as Figure 4 As shown, the three magnetic sensors 4 are installed in three sensor receiving holes 19 provided on the lower surface of the housing 16. In addition, the three yokes 15 are embedded in the housing 16. The three magnetic sensors 4 and the three yokes 15 are arranged at predetermined positions in the housing 16. In addition, the three magnetic sensors 4 are all the same sensors. In addition, the three yokes 15 are all the same yokes.

[0041] (Magnetic sensor and yoke)

[0042] The magnetic sensor 4 and the yoke 15 are described. For the convenience of description, the directions of the front (Fd), rear (Bd), top (Ud), bottom (Dd), left (Ld), and right (Rd) of the magnetic sensor 4 and the yoke 15 are shown in FIG. Figures 5 to 7 , as indicated by the arrow in the lower right corner of FIG. 11.

[0043] Figure 5 (A) shows a state where one of the three magnetic sensors 4 is viewed from the upper front right. Figure 5 (B) shows a state viewed from the upper rear right of the magnetic sensor 4 . Figure 6 The bobbin 6 of the magnetic sensor 4 is shown as viewed from the upper front right.

[0044] The magnetic sensor 4 is a part of the magnetic sensor device 3 that detects the rotating magnetic field. Figure 5 As shown in FIG. 8 (A), the magnetic sensor 4 includes a magnetic wire 5 , a bobbin 6 , a coil 12 , and two terminals 14 .

[0045] The magnetic wire 5 is a magnetic wire that exerts a large Barkhausen effect, and is a wire material called a composite magnetic wire. The magnetic wire 5 is formed, for example, of a semi-hard magnetic material containing iron and cobalt, and has a diameter of, for example, about 0.1 mm to 1 mm, and a length of, for example, about 10 mm to 30 mm. The magnetic wire 5 is formed, for example, by drawing the semi-hard magnetic material and twisting it multiple times while changing the direction. The magnetic wire 5 has a uniaxial anisotropy in which the direction of easy magnetization is the direction of the central axis of the magnetic wire 5. In addition, in the magnetic wire 5, the coercive force of the central side portion is greater than the coercive force of the peripheral side portion. The magnetic wire 5 has the property that the magnetization direction of the magnetic wire 5 (the peripheral side portion thereof) is rapidly reversed according to the change in the direction of the external magnetic field.

[0046] The bobbin 6 is formed of a non-magnetic material such as resin. The bobbin 6 has a bilaterally symmetrical shape. Figure 6 As shown, the bobbin 6 includes a wire winding portion 7, two wire support portions 8, two flange portions 9, and a wire receiving groove 10. The wire winding portion 7 is provided in the middle portion of the bobbin 6 in the left-right direction, and is formed into a cylindrical shape extending in the left-right direction. The wire support portion 8 is provided at the left end and the right end of the bobbin 6, respectively. The flange portion 9 is provided between the wire winding portion 7 and the wire support portion 8 on the left, and between the wire winding portion 7 and the wire support portion 8 on the right, respectively. Each flange portion 9 is larger than the diameter of the wire winding portion 7. The wire receiving groove 10 is a groove extending from the left end to the right end of the bobbin 6.

[0047] The magnetic wire 5 is arranged inside the bobbin 6 in a manner extending linearly in the left-right direction. Specifically, the magnetic wire 5 is arranged in the wire receiving groove 10. The left end of the magnetic wire 5 is supported (fixed) at the left end of the wire receiving groove 10 formed in the wire support portion 8 on the left by a method such as bonding using an adhesive. Similarly, the right end of the magnetic wire 5 is supported (fixed) at the right end of the wire receiving groove 10 formed in the wire support portion 8 on the right. In addition, instead of the wire receiving groove 10, a hole extending from the left end to the right end of the bobbin 6, that is, a wire receiving hole, may be provided, and the magnetic wire 5 may be arranged in the wire receiving hole.

[0048] The coil 12 is disposed on the outer peripheral side of the magnetic wire 5 disposed in the wire receiving groove 10. Figure 5 As shown in FIG. 2 (A), the coil 12 is formed by winding an insulated electric wire 13 such as an enameled wire around the electric wire winding portion 7 .

[0049] like Figure 5As shown in (B), two terminals 14 are respectively provided at the rear of the two wire support parts 8. Specifically, one terminal 14 is provided at the terminal fixing part 11 protruding backward from the rear surface of the left wire support part 8. In addition, the other terminal 14 is provided at the terminal fixing part 11 protruding backward from the rear surface of the right wire support part 8. Each terminal 14 is formed into a rod-shaped body bent into an L-shape by a conductive material such as a metal material such as a copper alloy. One end side portion of each terminal 14 becomes a wire connection portion 14A, and the other end side portion of each terminal 14 becomes a substrate connection portion 14B. In each terminal 14, the wire connection portion 14A protrudes upward from the terminal fixing portion 11, and the substrate connection portion 14B protrudes backward from the lower side of the terminal fixing portion 11. One end of the insulated wire 13 is fixed to the wire connection portion 14A of one terminal 14 and electrically connected. The other end of the insulated wire 13 is fixed to the wire connection portion 14A of the other terminal 14 and electrically connected.

[0050] Figure 7 The magnetic sensor 4 and the yoke 15 corresponding to the magnetic sensor 4 are shown as viewed from the upper right front. The yoke 15 has a function of controlling the direction of the magnetic flux of the external magnetic field. Specifically, the yoke 15 controls the direction of the magnetic flux of the magnetic field formed by the magnetic field forming component 2. Figure 7 As shown, the yoke 15 includes two yoke pieces 15A. Each yoke piece 15A is formed of a soft magnetic material such as iron. A portion of one yoke piece 15A is arranged in front of the left portion of the magnetic sensor 4, and the other portion of one yoke piece 15A is arranged above the left end portion of the magnetic sensor 4. In addition, a portion of the other yoke piece 15A is arranged in front of the right portion of the magnetic sensor 4, and the other portion of the other yoke piece 15A is arranged above the right end portion of the magnetic sensor 4.

[0051] (shell)

[0052] The housing 16 is formed of a non-magnetic material such as resin. Figure 3 As shown in FIG. 1 , the housing 16 has a structure in which three sensor holding parts 17 are connected via a connecting part 18. Figure 4 As shown, one magnetic sensor 4 and one yoke 15 are housed and fixed in each sensor holding portion 17. The three sensor holding portions 17 have the same shape as each other.

[0053] Figure 8 FIG. 1 shows a state where a sensor holding portion 17 of the housing 16 is viewed from the oblique lower lateral side. For the convenience of explanation, the front (Fd), rear (Bd), upper (Ud), lower (Dd), left (Ld), and right (Rd) directions of the sensor holding portion 17 are shown in FIG. Figure 8 Determine as indicated by the arrow depicted in the lower right corner.

[0054] like Figure 8 As shown, a sensor receiving hole 19 for receiving the magnetic sensor 4 is formed in the sensor holding portion 17. The sensor receiving hole 19 is formed on the lower surface of the sensor holding portion 17, is open downward, and is closed at the top. The opening shape of the sensor receiving hole 19 is a quadrilateral corresponding to the shape and size of the magnetic sensor 4, so that the magnetic sensor 4 can be just inserted into the sensor receiving hole 19. The left-right dimension of the sensor receiving hole 19 is substantially equal to the left-right dimension of the magnetic sensor 4, and the front-back dimension of the sensor receiving hole 19 is substantially equal to the front-back dimension of each wire support portion 8 of the bobbin 6 of the magnetic sensor 4.

[0055] In addition, cutouts 20 are formed at the left rear and right rear portions of the sensor holding portion 17. When the magnetic sensor 4 is inserted into the sensor receiving hole 19, the terminal fixing portion 11 and the terminal 14 provided at the rear portion of the wire support portion 8 on the left side of the bobbin 6 of the magnetic sensor 4 are arranged inside the cutout 20 on the left side, and the terminal fixing portion 11 and the terminal 14 provided at the rear portion of the wire support portion 8 on the right side of the bobbin 6 of the magnetic sensor 4 are arranged inside the cutout 20 on the right side.

[0056] In addition, a plurality of protrusions 21 protruding forward are formed on the rear surface of the sensor receiving hole 19. When the magnetic sensor 4 is inserted into the sensor receiving hole 19, each protrusion 21 strongly abuts against the bobbin 6. As a result, the magnetic sensor 4 is fixed in the sensor receiving hole 19. When installing the magnetic sensor 4 in the sensor holding portion 17, the staff presses the magnetic sensor 4 into the sensor receiving hole 19. In addition, in a state where the magnetic sensor 4 is inserted deep into the sensor receiving hole 19 and the magnetic sensor 4 is installed in the sensor holding portion 17, the lower surface of the bobbin 6 of the magnetic sensor 4 (the lower surface of each wire support portion 8) and the lower surface of the sensor holding portion 17, that is, the lower surface of the housing 16, are arranged in the same plane.

[0057] Furthermore, a fixing member 22 for fixing the housing 16 to the substrate 31 is attached and fixed to the rear lower portion of the sensor holding portion 17 .

[0058] like Figure 3As shown, the three sensor holding parts 17 are integrated by connecting their front parts through a connecting part 18. In addition, the three sensor holding parts 17 are arranged in a manner that their lower surfaces are located in the same plane. In addition, when the housing 16 is observed from above, the three sensor holding parts 17 are arranged around the reference line Q at intervals of 120 degrees with the reference line Q as the center. In addition, the three sensor holding parts 17 are arranged in a manner that the front parts of each of them face the reference line Q. In addition, the three sensor holding parts 17 are arranged in a manner that the distances between the sensor holding parts 17 and the reference line Q are equal to each other. In addition, the connecting part 18 is formed in a cylindrical shape, and the center of the connecting part 18 is located on the reference line Q. In addition, the inner diameter of the connecting part 18 is set to a value larger than the outer diameter of the magnetic field forming part 2. In addition, in the present embodiment, the diameter of the through hole 31B of the substrate 31 is set to a value larger than the outer diameter of the magnetic field forming part 2, and the inner diameter of the connecting part 18 is set to the same value as the diameter of the through hole 31B (refer to Figure 1 and Figure 2 ). In addition, the housing 16 has a rotationally symmetrical (three-dimensionally symmetrical) shape with the reference line Q as the center when viewed from above.

[0059] The three magnetic sensors 4 are mounted in the sensor receiving holes 19 of the three sensor holding parts 17 of the housing 16. In addition, in the present embodiment, the three yokes are integrated with the housing 16 by insert molding. The three yokes 15 are respectively embedded in the three sensor holding parts 17. In each sensor holding part 17, the yoke 15 is located in front of the sensor receiving hole 19.

[0060] (Configuration of magnetic sensor etc. in the housing)

[0061] Fig. 9 The arrangement of the three magnetic sensors 4 and the three yokes 15 in the housing 16 is shown as viewed from above. Fig.10 The configuration of the three magnetic sensors 4 and the three magnetic yokes 15 in the housing 16 is shown as viewed from the oblique upper lateral side. Fig. 9 and Fig.10 In FIG. 1 , S represents a reference surface located in the same plane as the lower surface of the housing 16. For the convenience of illustration, the reference surface S is provided with a lattice pattern.

[0062] like Fig. 9 and Fig.10As shown, in the housing 16, three magnetic sensors 4 are arranged on a reference plane S located in the same plane as the lower surface of the housing 16. Specifically, the lower surface of each wire support portion 8 of the bobbin 6 of each magnetic sensor 4 is placed on the reference plane S. In addition, in the housing 16, the three magnetic sensors 4 are arranged at intervals of 120 degrees around a reference line Q orthogonal to the reference plane S. In addition, in the housing 16, the three magnetic sensors 4 are arranged in a manner that the extension direction of the magnetic wire 5 is parallel to the reference plane S. In addition, in the present embodiment, in the housing 16, the three magnetic sensors 4 are arranged so that when the housing 16 is viewed from above, the central portion in the extension direction of the magnetic wire 5 (strictly speaking, the central portion in the extension direction of the central axis of the magnetic wire 5) is tangent to the reference circle C. The reference circle C is a circle drawn on the reference plane S and whose center is located on the reference line Q. The three magnetic sensors 4 are arranged so that their front portions face the reference line Q and the distances between the magnetic sensors 4 and the reference line Q are equal to each other. When the three magnetic sensors 4 are mounted in the three sensor receiving holes 19 of the housing 16 , the three magnetic sensors 4 are arranged in this manner.

[0063] In addition, in the housing 16, three yokes are arranged on the inner circumference of the three magnetic sensors 4 arranged around the reference line Q in a manner adjacent to the three magnetic sensors 4, respectively. Specifically, the three yokes 15 are arranged on the reference plane S at intervals of 120 degrees in a manner such that their front portions face the reference line Q and the distances between the yokes 15 and the reference line Q are equal to each other. The three yokes 15 are embedded in the housing 16 in such a manner as to be arranged in this way.

[0064] (Mounting the Magnetic Sensor Device on the Substrate)

[0065] The magnetic sensor device 3 includes three magnetic sensors 4, three yokes 15, and a housing 16, and the three magnetic sensors 4 and the three yokes 15 are integrated via the housing 16. Therefore, the mounting of the magnetic sensor device 3 on the substrate 31 is substantially completed only by mounting the housing 16, which integrates the three magnetic sensors 4 and the three yokes 15, on the mounting surface 31A of the substrate 31.

[0066] When mounting the housing 16 on the mounting surface 31A of the substrate 31, the worker first places the lower surface of the housing 16 on the mounting surface 31A of the substrate 31 while aligning the reference line Q in the housing 16 with the rotation axis X of the rotation shaft 40. When the lower surface of the housing 16 contacts the mounting surface 31A of the substrate 31, the lower surface of each wire support portion 8 of the bobbin 6 of each magnetic sensor 4 also contacts the mounting surface 31A of the substrate 31 at the same time. In addition, at the same time, the lower surface of each fixing metal member 22 provided in the housing 16 contacts the fixing pad 32 provided on the mounting surface 31A of the substrate 31, and the lower surface of the substrate connection portion 14B of each terminal 14 of each magnetic sensor 4 contacts the connection pad 33 provided on the mounting surface 31A of the substrate 31. Next, each fixing metal member 22 is welded to the fixing pad 32. In addition, the substrate connection portion 14B of each terminal 14 in each magnetic sensor 4 is welded to the connection pad 33.

[0067] By mounting the housing 16 on the mounting surface 31A of the substrate 31, as shown in FIG. Figure 1 and Figure 2 As shown, the magnetic field forming member 2 is arranged inside the connecting portion 18 of the housing 16 in a state where it does not contact the connecting portion 18. Fig. 9 The position of the reference plane S shown is the same as the position of the mounting surface 31A. The three magnetic sensors 4 and the three yokes 15 are arranged on the outer peripheral side of the magnetic field forming member 2 on the mounting surface 31A of the substrate 31 while maintaining the positional relationship formed on the reference plane S.

[0068] That is, Figure 1 and Figure 2 As shown, three magnetic sensors 4 are arranged on the mounting surface 31A of the substrate 31. The three magnetic sensors 4 are arranged on the outer peripheral side of the magnetic field forming component 2 at intervals of 120 degrees in the rotation direction of the magnetic field forming component 2. In addition, each magnetic sensor 4 is arranged in a manner that the extension direction of the magnetic wire 5 is parallel to the mounting surface 31A of the substrate 31. In addition, when the mounting surface 31A of the substrate 31 is observed from above, each magnetic sensor 4 is arranged in a manner that the central part of the extension direction of the magnetic wire 5 (strictly speaking, the central part in the extension direction of the central axis of the magnetic wire 5) is tangent to the circle D drawn on the outer peripheral side of the magnetic field forming component 2 with the rotation center of the rotating shaft 40 as the center. When the mounting surface 31A of the substrate 31 on which the housing 16 is mounted is observed from above, the circle D coincides with the reference circle C. In addition, three yokes 15 are arranged on the mounting surface 31A of the substrate. The three yokes 15 are arranged on the outer peripheral side of the magnetic field forming component 2 at intervals of 120 degrees in the rotation direction of the magnetic field forming component 2. Furthermore, each yoke 15 is disposed adjacent to the magnetic sensor 4 on the inner peripheral side of the magnetic sensor 4 .

[0069] In this way, simply by mounting the housing 16 on the mounting surface 31A of the substrate 31 , a predetermined positional relationship among the magnetic field forming member 2 , the three magnetic sensors 4 , and the three yokes 15 for detecting the rotation of the rotating shaft 40 can be determined at once.

[0070] (Magnetic field detection operation of magnetic sensors, etc.)

[0071] Fig.11 (A) shows the positional relationship among the magnetic field forming member 2, three magnetic sensors 4 and three magnetic yokes 15 when the magnetic sensor device 3 is disposed on the substrate 31. Fig.11 The magnetic field detection operation of the magnetic sensor 4 and the yoke 15 will be described with reference to one magnetic sensor 4 and one yoke 15 arranged on the upper side among the three magnetic sensors 4 and the three yokes 15 in (A).

[0072] exist Fig.11 In (A), the S pole of the magnetic field forming component 2 is close to the left front of the upper magnetic sensor 4, and the N pole of the magnetic field forming component 2 is close to the right front of the magnetic sensor 4. If the rotating shaft 40 is rotated 90 degrees clockwise from this state, Fig.11 As shown in (B), the N pole of the magnetic field forming component 2 is close to the left front of the magnetic sensor 4, and the S pole of the magnetic field forming component 2 is close to the right front of the magnetic sensor 4. At this time, the direction of the magnetic field of the magnetic wire 5 acting on the magnetic sensor 4 becomes right. As a result, the magnetization direction of the magnetic wire 5, which was in the left direction just before, is rapidly reversed to the right direction. As a result, Fig.11 As shown in (D) of FIG. 1 , a current pulse P1 in a positive direction, for example, is generated in the coil 12 .

[0073] Thereafter, if the rotating shaft 40 is further rotated 90 degrees clockwise, Fig.11 As shown in (C), the S pole of the magnetic field forming component 2 is close to the left front of the magnetic sensor 4, and the N pole of the magnetic field forming component 2 is close to the right front of the magnetic sensor 4. At this time, the direction of the magnetic field of the magnetic wire 5 acting on the magnetic sensor 4 becomes the left direction. As a result, the magnetization direction of the magnetic wire 5, which was in the right direction just before, is rapidly reversed to the left direction. As a result, Fig.11 As shown in (D), a current pulse P2 in a negative direction, for example, is generated in the coil 12 .

[0074] One end of the insulated wire 13 forming the coil 12 is connected to, for example, a detection circuit provided on the substrate 31 via one terminal 14 of the magnetic sensor 4 and one connection pad 33 provided on the mounting surface 31A of the substrate 31. In addition, the other end of the insulated wire 13 forming the coil 12 is connected to the above-mentioned detection circuit via another terminal 14 of the magnetic sensor 4 and another connection pad 33 provided on the mounting surface 31A of the substrate 31. With this structure, the current pulses P1 and P2 generated by the coil 12 are output as pulse signals to the above-mentioned detection circuit.

[0075] The detection circuit detects the rotation amount and rotation direction of the rotating shaft 40 based on the pulse signals respectively output from the coils 12 of the three magnetic sensors 4 disposed on the mounting surface 31A of the substrate 31. As a method for detecting the rotation amount and rotation direction of the rotating shaft 40 in the rotation detection device 1, for example, the method described in International Publication No. 2016 / 002437 can be used.

[0076] In order to increase the level of the current pulse generated by the coil 12 or to make the waveform of the current pulse sharp, it is preferable to concentrate the magnetic flux of the magnetic field formed by the two magnetic poles of the magnetic field forming member 2 near the left front and right front of the magnetic sensor 4 on the magnetic line 5. Fig.11 (B) or Fig.11 As shown in (C), a yoke 15 is arranged between the magnetic sensor 4 and the magnetic field forming component 2. The yoke 15 controls the direction of the magnetic flux so that the magnetic flux of the magnetic field formed by the two magnetic poles of the magnetic field forming component 2 near the left front and right front of the magnetic sensor 4 is concentrated on the magnetic line 5. Fig.11 (B) and Fig.11 Arrow F in (C) indicates the flow of magnetic flux whose direction is controlled by yoke 15. Magnetic flux is concentrated on magnetic wire 5 by yoke 15, so that magnetic flux flows along the extending direction of magnetic wire 5 and magnetic flux passes through magnetic wire 5 reliably.

[0077] As described above, in the magnetic sensor device 3 of the embodiment of the present invention, the three magnetic sensors 4 are fixed in the housing 16, and the three magnetic sensors 4 are arranged on the reference plane S located in the same plane as the lower surface of the housing 16, so that they are arranged at intervals of 120 degrees around the reference line Q orthogonal to the reference plane S, the extension direction of the magnetic wire 5 is parallel to the reference plane S, and the central part of the extension direction of the magnetic wire 5 is in contact with the reference circle C when the housing 16 is viewed from above. In this way, in the magnetic sensor device 3 of the present embodiment, the arrangement of the three magnetic sensors 4 for detecting the rotation of the rotating shaft 40 is determined and fixed in the housing 16, so that by mounting the housing 16 on the mounting surface 31A of the substrate 31, the arrangement of the three magnetic sensors 4 for detecting the rotation of the rotating shaft 40 is determined on the mounting surface 31A of the substrate 31. Therefore, according to the magnetic sensor device 3 of the present embodiment, compared with the prior art in which the three magnetic sensors are independently mounted on the substrate, the deviation of the arrangement of the three magnetic sensors 4 can be suppressed.

[0078] In addition, according to the magnetic sensor device 3 of the present embodiment, the predetermined positional relationship between the magnetic field forming member 2 for detecting the rotation of the rotating shaft 40 and the three magnetic sensors 4 can be determined at once simply by mounting the housing 16 on the mounting surface 31A of the substrate 31. Therefore, compared with the prior art in which the three magnetic sensors are mounted independently on the substrate, the man-hours for mounting the magnetic sensors can be reduced.

[0079] In addition, in the magnetic sensor device 3 of the present embodiment, the three yokes 15 corresponding to the three magnetic sensors 4 in a one-to-one manner are fixed together with the three magnetic sensors 4 in the housing 16. According to the magnetic sensor device 3 of the present embodiment having such a structure, the three yokes 15 can be arranged on the mounting surface 31A of the substrate 31 only by mounting the housing 16 on the mounting surface 31A of the substrate 31, and the magnetic flux of the magnetic field formed by the magnetic field forming member 2 can be concentrated on the magnetic wires 5 of each magnetic sensor 4. Therefore, compared with the case where the three yokes are mounted on the substrate independently, the displacement of the arrangement between the yokes and the magnetic sensors can be suppressed, and the man-hours for the yoke mounting operation can be reduced.

[0080] In the magnetic sensor device 3 of the present embodiment, the plurality of yokes are integrated with the housing by insert molding, thereby making it possible to firmly fix the yoke 15 in the housing and to precisely determine the position of the yoke in the housing 16, thereby improving the effect of suppressing the configuration deviation between the yoke and the magnetic sensor.

[0081] In addition, in the magnetic sensor device 3 of the present embodiment, the inner diameter of the connection portion 18 of the housing 16 is consistent with the diameter of the through hole 31B of the substrate 31. Therefore, by arranging the housing 16 on the mounting surface 31A of the substrate 31 in such a manner that the inner surface of the connection portion 18 and the inner surface of the through hole 31B are aligned with each other, the mounting position of the housing 16 on the substrate 31 can be accurately determined.

[0082] In addition, according to this embodiment, the configuration of the magnetic field forming component 2, three magnetic sensors 4 and three yokes 15 for detecting the rotation of the rotating shaft 40 can be determined simply by mounting the housing 16 on the mounting surface 31A of the substrate 31, thereby making it easy to manufacture the rotation detection device 1 with high rotation detection accuracy.

[0083] In the above embodiment, the case where three magnetic sensors 4 are arranged at 120 degree intervals and three yokes 15 are arranged at 120 degree intervals in the housing 16 of the magnetic sensor device 3 is given as an example, but the intervals between the three magnetic sensors and the intervals between the three yokes 15 are not limited to these. Fig.12 As shown, three magnetic sensors 4 may be arranged at intervals of 60 degrees in the housing 52 of the magnetic sensor device 51, and three yokes 15 may be arranged at intervals of 60 degrees.

[0084] In addition, the number of magnetic sensors provided in the housing of the magnetic sensor device of the present invention is not limited to three, and may be two, or may be four or more. The same applies to the yoke. The housing of the magnetic sensor device of the present invention may also be configured such that no yoke is provided.

[0085] In the above embodiment, the case where the three magnetic sensors 4 are arranged in the housing 16 so that the central portion of the magnetic line 5 in the extending direction is tangent to the reference circle C when the housing 16 is viewed from above is given as an example, but the present invention is not limited to this. Fig.13 As shown, the three magnetic sensors 4 can also be configured so that the magnetic lines 5 of each magnetic sensor 4 intersect with the circumference of the reference circle C. In addition, in the case of this configuration, the configuration of the magnetic field forming component (the magnetic pole or magnet for forming the rotating magnetic field) in the rotation detection device also becomes different. For the configuration of the magnetic field forming component, refer to Japanese Patent Gazette No. 2019-200098. In addition, in the configuration of the multiple magnetic sensors in the magnetic sensor device of the present invention, other methods can also be used.

[0086] In the above embodiment, the reference plane S is exemplified as a plane located in the same plane as the lower surface of the housing 16, but the present invention is not limited thereto. The reference plane S may be a plane parallel to the lower surface of the housing 16 and located above or below the lower surface of the housing 16.

[0087] When the reference plane S is set to be parallel to the lower surface of the housing 16 and located above the lower surface of the housing 16, when each magnetic sensor 4 is mounted in the sensor receiving hole 19 of the housing 16, the lower surface of each wire support portion 8 of the bobbin 6 of the magnetic sensor 4 is located above the lower surface of the housing 16. As a result, when the lower surface of the housing 16 is placed on the mounting surface 31A of the substrate 31, the lower surface of each wire support portion 8 of the bobbin 6 of each magnetic sensor 4 is located above the mounting surface 31A of the substrate 31, and the substrate connection portion 14B of each terminal 14 of each magnetic sensor 4 does not contact the connection pad 33 on the mounting surface 31A of the substrate 31. Therefore, when the reference plane S is set to be a surface located above the lower surface of the housing 16, the position of the substrate connection portion 14B of each terminal 14 of each magnetic sensor 4 is lowered than the lower surface of the wire support portion 8, and the position of the lower surface of the substrate connection portion 14B of each terminal 14 in the vertical direction is made to coincide with the position of the lower surface of the fixing metal member 22 in the vertical direction. As a result, when the lower surface of the housing 16 is placed on the mounting surface 31A of the substrate 31, the substrate connection portion 14B of each terminal 14 of each magnetic sensor 4 and each fixing metal member 22 are simultaneously in contact with the connection pad 33 and the fixing pad 32 on the mounting surface 31A of the substrate 31, respectively, and the substrate connection portion 14B of each terminal 14 of each magnetic sensor 4 and each fixing metal member 22 can be welded to the connection pad 33 and the fixing pad 32, respectively.

[0088] On the other hand, when the reference plane S is set to be parallel to the lower surface of the housing 16 and located below the lower surface of the housing 16, when each magnetic sensor 4 is mounted in the sensor receiving hole 19 of the housing 16, the position of the lower surface of each wire support portion 8 of the bobbin 6 of the magnetic sensor 4 is lower than the position of the lower surface of the housing 16. As a result, when the housing 16 is mounted on the mounting surface 31A of the substrate 31, it is equivalent to placing the lower surface of each wire support portion 8 of the bobbin 6 of each magnetic sensor 4 on the mounting surface 31A of the substrate 31. At this time, the lower surface of the housing 16 is arranged above the mounting surface 31A of the substrate 31 and parallel to the mounting surface 31A of the substrate 31. As a result, each fixing metal fitting 22 of the housing 16 does not contact the fixing pad 32 on the mounting surface 31A of the substrate 31. Therefore, when the reference plane S is set to be a surface located below the lower surface of the housing 16, the lower portion of each fixing metal member 22 is lowered than the lower surface of the housing 16, and the position of the lower surface of the fixing metal member 22 in the vertical direction is made to coincide with the position of the lower surface of the substrate connection portion 14B of each terminal 14 in the vertical direction. As a result, when the lower surface of each wire support portion 8 of each magnetic sensor 4 is placed on the mounting surface 31A of the substrate 31, the substrate connection portion 14B of each terminal 14 of each magnetic sensor 4 and each fixing metal member 22 are simultaneously in contact with the connection pad 33 and the fixing pad 32 on the mounting surface 31A of the substrate 31, respectively, and the substrate connection portion 14B of each terminal 14 of each magnetic sensor 4 and each fixing metal member 22 can be welded to the connection pad 33 and the fixing pad 32, respectively.

[0089] In addition, in the above embodiment, the housing 16 (52) of the magnetic sensor device 3 (51) is configured to connect three sensor holding portions 17 via the connecting portion 18, but the structure of the housing of the magnetic sensor device of the present invention is not limited thereto, and may be, for example, a block or plate shape.

[0090] In addition, in the above-mentioned embodiment, the case where the housing 16 to which the three magnetic sensors 4 and the three yokes 15 are fixed is placed on the substrate 31 and fixed to the substrate 31, thereby providing the three magnetic sensors 4, the three yokes 15, and the housing 16 on the substrate 31 is given as an example, but the present invention is not limited to this. For example, after the housing 16 to which the three magnetic sensors 4 and the three yokes 15 are detachably fixed is placed on the substrate 31, each magnetic sensor 4 and each yoke 15 is firmly fixed to the substrate 31, but the housing 16 is not fixed to the substrate 31, and after each magnetic sensor 4 and each yoke 15 is firmly fixed to the substrate 31, the housing 16 is removed from the substrate 31 in a state where the three magnetic sensors 4 and the three yokes 15 are left on the substrate 31.

[0091] In this case, for example, the yoke 15 is fixed to each of the three magnetic sensors 4 so as not to be easily separated, and the three magnetic sensors 4 to which the yoke 15 is fixed are respectively fixed to three sensor receiving holes provided on the lower surface of the housing 16 so as to be easily separated. Fig.14 As shown in (A), the housing 16 fixed in such a manner that the three magnetic sensors 4 fixed with the yoke 15 can be easily separated is placed on the mounting surface 31A of the substrate 31. Fig.14 As shown in (B), the substrate connection portion 14B of each terminal 14 of each magnetic sensor 4 is welded to the connection pad 33 on the mounting surface 31A of the substrate 31. As a result, the three magnetic sensors 4 fixed with the yoke 15 are firmly fixed to the substrate 31. Next, as shown in Fig.14 As shown in (C), the housing 16 is separated upward from the substrate 31. Thus, the housing 16 is separated from the three magnetic sensors 4 welded to the substrate 31 and the three yokes 15 respectively fixed to the three magnetic sensors 4 in a manner that is not easily separated, and the three magnetic sensors 4 and the three yokes 15 remain on the mounting surface 31A of the substrate 31. As a method for fixing the yoke 15 to each of the three magnetic sensors 4 in a manner that is not easily separated, for example, a method of bonding the yoke 15 to each wire support portion 8 of the bobbin 6 of the magnetic sensor 4 by an adhesive can be used. In addition, the sensor receiving hole formed on the lower surface of the housing 16 is made larger than the sensor receiving hole 19 in the above-mentioned embodiment so that the magnetic sensor 4 fixed with the yoke 15 can be mounted on the housing 16. In addition, in order to make it easy to separate the magnetic sensor 4 fixed with the yoke 15 and the housing 16 from each other, for example, the height of each protrusion formed on the rear surface of the sensor receiving hole of the housing 16 is made lower than the protrusion 21 in the embodiment, so that the magnetic sensor 4 fixed with the yoke 15 can be easily pulled out from the sensor receiving hole. In addition, since the housing 16 is removed from the substrate 31 after the three magnetic sensors 4 fixed with the yoke 15 are welded to the substrate 31, the fixing metal parts 22 are not provided on the housing 16. In addition, when mounting components on the substrate, a mounting device equipped with an adsorption nozzle is sometimes used to move and arrange the components on the substrate. Fig.14 As shown in FIG. 1A , it is preferred that the upper portion of the connection portion 18 of the housing 16 is closed and a suction surface 23 for suctioning the housing 16 to the suction nozzle is formed at the center of the upper surface of the housing 16 .

[0092] The present invention can be modified appropriately within the scope of the claims and the entire specification without departing from the gist or concept of the invention, and the magnetic sensor device and rotation detection device accompanying such modification are also included in the technical concept of the present invention.

Claims

1. A magnetic sensor device, characterized in that: have: a plurality of magnetic sensors including a magnetic wire that exerts a large Barkhausen effect and a coil disposed on an outer circumference of the magnetic wire; and a housing for fixing the plurality of magnetic sensors respectively; The plurality of magnetic sensors are arranged on a reference plane identical to or parallel to the lower surface of the housing at predetermined intervals in the circumferential direction around a reference line orthogonal to the reference plane and in such a manner that the extending direction of the magnetic lines is parallel to the reference plane.

2. The magnetic sensor device according to claim 1, characterized in that A plurality of magnetic yokes are provided to control the direction of the magnetic flux of the external magnetic field. The plurality of magnetic yokes are arranged in a one-to-one correspondence with the plurality of magnetic sensors, The plurality of yokes are fixed to the housing together with the plurality of magnetic sensors.

3. The magnetic sensor device according to claim 2, characterized in that The plurality of yokes are integrated with the housing by insert molding.

4. A rotation detection device for detecting the rotation of a rotating body, characterized in that: have: The magnetic sensor device according to claim 1; a magnetic field forming member, which rotates together with the rotating body and forms a rotating magnetic field on the outer peripheral side of the rotating body when the rotating body rotates; as well as a substrate having a mounting surface, and arranged near the magnetic field forming component in such a manner that the mounting surface faces upward and a plane including the mounting surface is orthogonal to the rotation axis and does not contact any of the rotating body and the magnetic field forming component, The housing of the magnetic sensor device is fixed to the substrate in a state where it is arranged on or above the mounting surface so that the reference line coincides with the rotation axis of the rotating body and the lower surface of the housing is parallel to the mounting surface.

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