Rotation detection device

Abstract

The present application easily configures a magnetic sensor and an optical sensor as positions of the magnetic sensor relative to a magnet and the optical sensor relative to an optical disc, respectively, as designed positions. A rotation detection device includes a substrate having an insertion hole of a rotation shaft, a magnetic field forming member rotating along with the rotation shaft, a plurality of magnetic sensors arranged around the magnetic field forming member, a housing accommodating the plurality of magnetic sensors and provided to the substrate, an optical sensor provided to the substrate on a side opposite to the plurality of magnetic sensors, and an optical disc arranged opposite to the substrate across the optical sensor and rotating along with the rotation shaft. The rotation detection device has an adjustment mechanism capable of adjusting positions of the plurality of magnetic sensors relative to the magnetic field forming member by adjusting a position of the housing relative to the substrate in a state where the substrate is positioned by adjusting a position of the optical sensor relative to the optical disc.

Description

Technical Field

[0001] This invention relates to a rotation detection device comprising a magnetic sensor utilizing the Big Backhausen effect and an optical sensor. Background Technology

[0002] A magnetic sensor utilizing the Big Backhausen effect comprises: a magnetic wire exhibiting the Big Backhausen effect; a winding tube containing the magnetic wire; a coil formed by winding the wire around the winding tube; and two terminals for connecting the coil to an external detection circuit. The two terminals are respectively fixed to both ends of the winding tube. One terminal is connected to one end of the wire forming the coil, and the other terminal is connected to the other end of the wire forming the coil. The magnetic sensor is electrically connected to a circuit on a substrate, for example, by soldering the ends of each terminal to the substrate. Furthermore, by soldering the terminals, the magnetic sensor is fixed to the substrate, and its position on the substrate is determined.

[0003] For example, in the rotation detection device disclosed in Patent Document 1, when using magnetic sensors to detect the rotation of a rotating shaft, a magnet is fixed to the outer periphery of the rotating shaft, and a rotating magnetic field is formed on the outer periphery of the rotating shaft when it rotates. Furthermore, multiple magnetic sensors are mounted on a substrate, which is positioned on the outer periphery of the rotating shaft without contacting either the rotating shaft or the magnet. The multiple magnetic sensors are arranged near the rotating track of the magnet at positions different from each other in the direction of magnet rotation. Therefore, multiple magnetic sensors can be used to detect the rotating magnetic field formed by the rotation of the rotating shaft, and the amount and direction of rotation of the rotating shaft can be detected based on the detection signals output from the coils of each magnetic sensor.

[0004] Patent Document 1: International Publication No. 2016 / 021074

[0005] For example, in the case of forming a rotation detection device that uses a magnetic sensor to detect the rotation of a rotating shaft, a substrate on which the magnetic sensor is provided is placed on the outer periphery of the rotating shaft. In the conventional way of manufacturing such a rotation detection device, the magnetic sensor is first fixed to the substrate by brazing, and then the substrate on which the magnetic sensor is fixed is fixed to a housing, for example, that supports the rotating shaft so that it can rotate, via a bracket, support, or the like.

[0006] To improve the detection accuracy of the magnetic sensor for the rotation of the rotating shaft, the magnetic sensor needs to be configured such that the distance between the magnetic sensor and the axis of the rotating shaft is equal to the position of the magnetic sensor relative to the magnet rotating with the rotating shaft, which is the designed position. However, during the manufacturing process of the rotation detection device, the position of the magnetic sensor relative to the magnet sometimes deviates from the designed position.

[0007] One reason for the positional offset of the magnetic sensor relative to the rotation axis is that it likely occurs during the brazing process of soldering the magnetic sensor to the substrate. Another reason is that it likely occurs during the substrate mounting process, where the substrate with the soldered magnetic sensor is mounted onto a housing that supports the rotation axis, causing the substrate to shift relative to the housing. Therefore, to ensure that the magnetic sensor is positioned correctly relative to the rotation axis according to the design, both the positioning of the magnetic sensor relative to the substrate during the brazing process and the positioning of the substrate relative to the housing during the substrate mounting process must be strictly controlled. Consequently, configuring the magnetic sensor to achieve its designed position relative to the rotation axis is not easy.

[0008] Furthermore, in the rotation detection device, multiple magnetic sensors are housed in a housing, which is then secured to a substrate by threads. In this case, threaded holes are provided in a one-to-one correspondence between the housing and the substrate to ensure the magnetic sensors are positioned according to the design. However, the proper position of the magnetic sensor relative to the magnet can sometimes vary slightly in each device due to the relationship between the magnet and the magnetic sensor. Therefore, in a structure where the housing is secured to the substrate, it is difficult to adjust the magnetic sensors to the appropriate position based on the relationship between the magnet and the magnetic sensor.

[0009] Furthermore, some rotation detection devices include both magnetic and optical sensors. In this case, it is difficult to position the magnetic sensor appropriately based on the relationship between the optical sensor and the magnet rotating with the axis of rotation, while simultaneously positioning the magnetic sensor appropriately based on the relationship between the optical disc rotating with the axis of rotation and the optical sensor. Summary of the Invention

[0010] The present invention was made in view of the problems described above. The object of the present invention is to provide a rotation detection device that can easily configure a magnetic sensor and an optical sensor such that the position of the magnetic sensor relative to the magnet and the position of the optical sensor relative to the optical disc are respectively designed positions.

[0011] To address the aforementioned issues, the rotation detection apparatus of the present invention is a rotation detection apparatus for detecting the rotation of a rotating body, comprising: a single substrate having an insertion hole for inserting the rotating body; a magnetic field forming member that rotates with the rotation of the rotating body; a plurality of magnetic sensors disposed around the magnetic field forming member; a housing housing the plurality of magnetic sensors and disposed on the substrate; an optical sensor disposed on the substrate on the side opposite to the plurality of magnetic sensors; and an optical disc disposed opposite to the substrate across the optical sensor and rotating with the rotation of the rotating body. The rotation detection apparatus has an adjustment mechanism that, while the substrate is positioned by adjusting the position of the optical sensor relative to the optical disc, adjusts the position of the plurality of magnetic sensors relative to the magnetic field forming member by adjusting the position of the housing relative to the substrate.

[0012] According to the present invention, the positional relationship between the magnetic field forming component for detecting the rotation of the rotating body and the magnetic sensor can be easily adjusted and the magnetic sensor can be installed simply by mounting the housing onto the substrate on which the optical sensor is provided, without affecting the positional relationship between the optical disc and the optical sensor.

[0013] Furthermore, the rotation detection device of the present invention preferably includes a connecting member for connecting the outer shell and the substrate, the substrate having a connecting hole through which the connecting member is inserted, and as the adjustment mechanism, the outer shell having a first adjustment hole having a diameter larger than the connecting member and having a predetermined adjustment range, and through which the connecting member is inserted.

[0014] Furthermore, in the rotation detection device of the present invention, the housing preferably has a second adjustment hole as the adjustment mechanism. The second adjustment hole is formed with a diameter larger than the insertion hole and has a predetermined adjustment range, and is used for the insertion of the rotating body and the magnetic field forming component.

[0015] Furthermore, in the rotation detection device of the present invention, it is preferable that the magnetic sensor and the substrate respectively have a first terminal and a second terminal in contact with each other. As the adjustment mechanism, one of the first terminal and the second terminal is formed by a compression terminal, and the other of the first terminal and the second terminal is formed by a conductor portion with a contact area larger than that of the compression terminal and having a predetermined adjustment range.

[0016] According to the present invention, a rotation detection device can be provided that can easily configure a magnetic sensor and an optical sensor such that the position of the magnetic sensor relative to the magnet and the position of the optical sensor relative to the optical disc are respectively designed positions. Attached Figure Description

[0017] Figure 1 This is a perspective view of the rotation detection device according to an embodiment of the present invention, taken from above.

[0018] Figure 2 This is a plan view showing the rotation detection device according to an embodiment of the present invention from above.

[0019] Figure 3 It means along Figure 2 A cross-sectional view of the rotating detection device cut by cutting line III-III, viewed from the side.

[0020] Figure 4 This is a plan view of the substrate of the rotation detection device according to an embodiment of the present invention, taken from above.

[0021] Figure 5 This is a plan view of the magnetic sensor device of the rotation detection device according to an embodiment of the present invention, taken from above.

[0022] Figure 6 This is a plan view of the magnetic sensor device of the rotation detection apparatus according to an embodiment of the present invention, shown from below.

[0023] Figure 7 This is a plan view from above showing the magnetic sensor and magnetic yoke of the rotation detection device according to an embodiment of the present invention.

[0024] Figure 8 This is a perspective view of the magnetic sensor and magnetic yoke of the rotation detection device according to an embodiment of the present invention, taken from above.

[0025] Figure 9 This is a perspective view of the magnetic sensor of the rotation detection device according to an embodiment of the present invention, taken from above.

[0026] Figure 10 This is a perspective view of the magnetic sensor of the rotation detection device according to an embodiment of the present invention, shown from below.

[0027] Figure 11 This is a perspective view from above showing the magnetic sensor of the rotation detection device according to an embodiment of the present invention, excluding the coil.

[0028] Figure 12 This is a perspective view of the terminals of the magnetic sensor of the rotation detection device according to an embodiment of the present invention, taken from above.

[0029] Figure 13 This is an explanatory diagram illustrating a method for positioning a magnetic sensor device in a rotation detection apparatus according to an embodiment of the present invention.

[0030] Figure 14 This is a perspective view from above showing the terminals of the magnetic sensor of a rotation detection device according to another embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] 1… Rotation detection device; 2… Substrate; 3… Magnetic field forming component; 4… Magnetic sensor device; 5… Optical disc; 6… Optical sensor; 10… Insertion hole; 11… Fixing hole; 12… Fixing component; 13… Connecting hole; 14… Connecting component; 15… Conductor part; 20… Magnetic sensor; 21… Magnetic yoke; 22… Housing; 30… Magnetic wire; 31… Winding tube; 32… Coil; 33, 34… Terminals; 40… First adjustment hole; 41… Second adjustment hole; 42… Positioning reference hole; 100… Rotation shaft; 101… Housing. Detailed Implementation

[0033] (Rotational detection device)

[0034] The rotation detection device 1 according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a perspective view of the rotation detection device 1 from above. Figure 2 This is a plan view of the rotation detection device 1 from above. Figure 3 Show along Figure 2 The cross section of the rotating detection device 1, which cuts through the cutting line III-III, is from the transverse direction (in the cutting line III-III). Figure 2 The middle (top left) shows the observed state.

[0035] The rotation detection device 1 is a device for detecting the rotation of the rotating shaft 100, which is a rotating body. For example, the rotating shaft 100 is the output shaft of a motor, and the rotation detection device 1 is assembled to the motor. The rotating shaft 100 is rotatably supported on the motor and protrudes upward from the upper surface of the motor housing 101.

[0036] The rotation detection device 1 includes: a single substrate 2; a magnetic field forming component 3 for forming a rotating magnetic field; a magnetic sensor device 4 for detecting the rotating magnetic field; an optical disc 5 for generating detection light; and an optical sensor 6 for detecting the detection light.

[0037] (Substrate)

[0038] The substrate 2 is located on the outer periphery of the rotating shaft 100 and near the magnetic field forming component 3. Figure 4 This is a plan view of the substrate 2 from above. The substrate 2 is formed in the shape of a circular plate and is arranged in a position where its plane is orthogonal to the rotation axis of the rotation axis 100.

[0039] A circular insertion hole 10 is formed coaxially with the rotation shaft 100 at the center of the substrate 2, and the rotation shaft 100 is inserted into the insertion hole 10. The insertion hole 10 is formed to have a diameter larger than the outer diameter of the magnetic field forming member 3 provided around the rotation shaft 100, and the rotation shaft 100 and the magnetic field forming member 3 are disposed on the substrate 2 without contacting the edge of the insertion hole 10, i.e., the substrate 2. With the rotation shaft 100 inserted into the insertion hole 10, the substrate 2 is fixed to the motor housing 101 via the support column 102.

[0040] The base plate 2 has a fixing hole 11 through which a fixing member 12, such as a bolt, is inserted, and is fixed to the support column 102 and the housing 101 by the fixing member 12 through the fixing hole 11. The fixing hole 11 is formed to have a diameter that is approximately the same as the diameter of the shaft portion of the fixing member 12.

[0041] Additionally, the substrate 2 has a connecting hole 13 through which a connecting member 14, such as a bolt, is inserted to connect the magnetic sensor device 4. The connecting member 14, through which the magnetic sensor device 4 (first adjustment hole 40) and the connecting hole 13 are inserted, is fixed to the support column 102. The connecting hole 13 is formed to have a diameter approximately the same as the diameter of the shaft portion of the connecting member 14.

[0042] Electrical / electronic components other than the magnetic sensor device 4 are mounted on the upper and lower surfaces of the substrate 2 by means of soldering or the like. For example, a conductor portion 15 (second terminal) such as a solder pad for electrical connection with the magnetic sensor device 4 is mounted on the upper surface of the substrate 2. Specifically, the conductor portion 15 is configured corresponding to the terminal 33 (first terminal) of the magnetic sensor 20 of the magnetic sensor device 4, and is formed with a contact area larger than that of the terminal 33 and having a predetermined adjustment range. For example, relative to the terminal 33 which has a size of about 0.6 mm, the conductor portion 15 is formed with a contact area of ​​about 2 mm square. In addition, an optical sensor 6 is mounted on the lower surface of the substrate 2.

[0043] (Magnetic field generating component)

[0044] The magnetic field forming component 3 is formed into a ring shape, for example, from a magnetic material such as ferrite. The magnetic field forming component 3 is coaxially disposed on the outer periphery of the rotation shaft 100 and fixed to the rotation shaft 100, rotating with the rotation of the rotation shaft 100. The magnetic field forming component 3 is disposed on the upper surface of the substrate 2 and is located inside the magnetic sensor 20 of the magnetic sensor device 4. The magnetic field forming component 3 is a multi-pole magnetized magnet, and on the outer periphery of the magnetic field forming component 3, four magnetic poles—N pole, S pole, N pole, S pole—are sequentially formed at 90-degree intervals along the circumference, for example. Alternatively, the magnetic field forming component 3 may also be formed from four unmagnetized magnets.

[0045] When a magnetic field is formed on the outer periphery of the magnetic field forming component 3, the magnetic field forming component 3 rotates along with the rotation axis 100, thereby rotating the magnetic field formed by the magnetic field forming component 3. As a result, a rotating magnetic field is formed that rotates around the rotation axis of the rotation axis 100.

[0046] (Magnetic sensor device)

[0047] Figure 5 This is a plan view showing the magnetic sensor device 4 from above. Figure 6 This is a plan view of the magnetic sensor device 4 from below. The magnetic sensor device 4 includes a plurality of magnetic sensors 20 (three magnetic sensors 20 in this embodiment), a plurality of magnetic yokes 21 (three magnetic yokes 21 in this embodiment), and a housing 22. The magnetic sensor device 4 is disposed on the upper surface of the substrate 2. Figure 7 This is a plan view showing the three magnetic sensors 20 and the three magnetic yokes 21 from above. Figure 8 This is a three-dimensional view showing the three magnetic sensors 20 and the three magnetic yokes 21 from above.

[0048] Three magnetic sensors 20 detect the rotating magnetic field formed by the magnetic field forming component 3, and are identical to each other. Three magnetic yokes 21 control the direction of the magnetic flux of the magnetic field formed by the magnetic field forming component 3, and are identical to each other. The magnetic sensor device 4 is integrally formed by housing and fixing the three magnetic sensors 20 and the three magnetic yokes 21 within a housing 22. For example, the three magnetic sensors 20 are respectively embedded and installed in three sensor receiving holes provided on the lower surface of the housing 22, and the three magnetic yokes 21 are embedded in the housing 22 by insert molding. Within the housing 22, the three magnetic sensors 20 are arranged on a reference plane located on the same plane as the lower surface of the housing 22. Figure 5 In the image, three magnetic sensors 20 and three magnetic yokes 21 housed within the outer casing 22 are shown in dashed lines.

[0049] As described later, the magnetic sensor device 4 has a plurality of circular first adjustment holes 40 corresponding to the coupling holes 13 of the substrate 2, and circular second adjustment holes 41 corresponding to the insertion holes 10 of the substrate 2 on the housing 22. Details about the housing 22 will be described later. The magnetic sensor device 4 is disposed on the substrate 2 by placing the lower surface of the housing 22 on the substrate 2 with the second adjustment holes 41 corresponding to the insertion holes 10 and the first adjustment holes 40 corresponding to the coupling holes 13. In addition, the magnetic sensor device 4 is fixed to the support column 102 by the coupling member 14 through the first adjustment holes 40 and the coupling holes 13, and the magnetic sensor device 4 is combined with the substrate 2 and fixed to the housing 101.

[0050] With the magnetic sensor device 4 disposed on the substrate 2, three magnetic sensors 20 and three magnetic yokes 21 are disposed on the substrate 2. The three magnetic sensors 20 are arranged at 120-degree intervals along the circumference of the second adjustment hole 41, located on the outer periphery side of the second adjustment hole 41. The three magnetic yokes 21 are arranged in a one-to-one correspondence with the three magnetic sensors 20, with each yoke 21 arranged adjacent to the corresponding magnetic sensor 20 on the inner periphery side of the magnetic sensor 20. Similarly, the three magnetic yokes 21 are arranged at 120-degree intervals along the circumference of the second adjustment hole 41, located on the outer periphery side of the second adjustment hole 41.

[0051] like Figure 9 , Figure 10 As shown, each magnetic sensor 20 has a magnetic wire 30 that exhibits the large Backhausen effect. Each magnetic sensor 20 is configured such that the extension direction of the magnetic wire 30 is parallel to the plane of the substrate 2, and when viewed from above, the central portion of the extension direction of the magnetic wire 30 is in contact with a predetermined circle coaxial with the second adjustment hole 41 at a position closer to the outer periphery of the magnetic field forming member 3.

[0052] Three magnetic sensors 20 and three magnetic yokes 21 are configured not to contact the magnetic field forming member 3. The magnetic field forming member 3 rotates along a rotation axis 100 that rotates relative to the housing 101, while the magnetic sensor device 4 disposed on the substrate 2 remains stationary and does not rotate relative to the housing 101. The three magnetic sensors 20 disposed on the magnetic sensor device 4 detect the rotating magnetic field formed around the magnetic field forming member 3. Specifically, as the magnetic field formed by the magnetic field forming member 3 rotates, the direction of the magnetic field acting on each magnetic sensor 20 changes, and each magnetic sensor 20 outputs a pulse signal corresponding to the change in the direction of the magnetic field. The magnetic sensor device 4 detects the amount and direction of rotation of the rotation axis 100 based on the pulse signals output from each magnetic sensor 20.

[0053] Each magnetic yoke 21 is formed, for example, of a soft magnetic material such as iron. Each magnetic yoke 21 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 member 3 at both ends of the magnetic wire 30 in the extension direction of the magnetic sensor 20 is concentrated on the magnetic wire 30. Through each magnetic yoke 21, the magnetic flux flows along the extension direction of the magnetic wire 30, and the magnetic flux reliably passes through the magnetic wire 30.

[0054] (Magnetic sensor)

[0055] Figure 9 This is a 3D view showing a magnetic sensor 20 from above. Figure 10 This is a perspective view of a magnetic sensor 20 from below. For ease of explanation, as... Figures 9-10The arrows depicted in the diagram indicate the front (F), back (B), up (U), down (D), left (L), and right (R) directions of the magnetic sensor 20. The magnetic sensor 20 includes a magnetic wire 30, a winding tube 31, a coil 32, and two terminals 33 (first terminals). Figure 11 This is a top-view perspective view of a magnetic sensor 20 excluding coil 32. Figure 12 This is a perspective view of terminal 33.

[0056] The magnetic wire 30 is a composite magnetic wire exhibiting the large Barkerhausen effect. The magnetic wire 30 is, for example, formed from a semi-rigid magnetic material containing iron and cobalt, with a diameter of approximately 0.1 mm to 1 mm and a length of approximately 10 mm to 30 mm. The magnetic wire 30 is formed, for example, by drawing the aforementioned semi-rigid magnetic material and repeatedly twisting it while changing its direction. The magnetic wire 30 exhibits uniaxial anisotropy, with the direction of easy magnetization being the direction of its central axis. In the magnetic wire 30, the coercivity of the central portion is greater than that of the outer peripheral portion. The magnetic wire 30 has the property that the magnetization direction of the outer peripheral portion rapidly reverses according to the change in the direction of the external magnetic field.

[0057] The winding tube 31 is formed of a non-magnetic material such as resin and is symmetrical from left to right. The winding tube 31 includes a wire winding portion 31a and two wire support portions 31b. The wire winding portion 31a is located in the middle of the winding tube 31 in the left-right direction and is formed into a cylindrical shape that extends in the left-right direction. The wire support portions 31b are respectively provided at the left and right ends of the winding tube 31, specifically, they are formed continuously with the left and right ends of the wire winding portion 31a. Wire receiving grooves 31c extending from the left end to the right end are provided on the wire support portions 31b, the wire winding portion 31a, and the wire support portions 31b on the left and right sides of the winding tube 31.

[0058] The magnetic wire 30 is arranged inside the winding tube 31 in a straight line extending in the left-right direction, specifically within the wire receiving groove 31c of the wire winding section 31a. The left end of the magnetic wire 30 is supported (fixed) to the left end of the wire receiving groove 31c by means of adhesive bonding or the like, and the right end of the magnetic wire 30 is similarly supported (fixed) to the right end of the wire receiving groove 31c. Alternatively, instead of the wire receiving groove 31c, a wire receiving hole extending from the left end to the right end of the winding tube 31 may be provided, and the magnetic wire 30 may be disposed within the wire receiving hole.

[0059] The coil 32 is disposed on the outer periphery of the magnetic wire 30 disposed within the wire receiving groove 31c. Specifically, the coil 32 is formed, for example, by winding an insulated wire, such as enameled wire, around the wire winding portion 31a.

[0060] Each terminal 33 is composed of a compression terminal. Furthermore, compression terminals are sometimes also referred to as spring terminals. Each terminal 33 is formed of a conductive material, such as a metal. Each terminal 33 includes a base 33a, a wire connection portion 33b, a spring portion 33c, and a contact portion 33d.

[0061] The base 33a is formed as a plate that is longer in the front-to-back direction. A wire connection portion 33b extends rearward from the rear end of the base 33a and connects to the end of the insulated wire of the coil 32 where the insulation has been removed. The wire connection portion 33b of one of the two terminals 33 connects to one end of the insulated wire, and the wire connection portion 33b of the other terminal 33 connects to the other end of the insulated wire. The spring portion 33c is a leaf spring used to displace the contact portion 33d in the vertical direction; for example, it bends downward from the front end of the base 33a, then bends rearward, then tilts downward and extends rearward. The contact portion 33d is the portion that contacts the conductor portion 15 disposed on the upper surface of the substrate 2 when the magnetic sensor device 4 is combined with the substrate 2. The contact portion 33d is disposed at the lower rear end of the spring portion 33c, and is formed, for example, by bending upward from the lower rear end of the spring portion 33c.

[0062] Two terminals 33 are respectively disposed at the lower parts of the two wire support portions 31b of the winding tube 31. With each terminal 33 disposed in its respective wire support portion 31b, the rear end of the wire connection portion 33b protrudes rearward from the rear surface of the wire support portion 31b. The contact portion 33d is generally configured to protrude downward from the lower surface of the wire support portion 31b, but is also pressed into the wire support portion 31b by being pressed from below to overcome the elastic force of the spring portion 33c and displaced upward. For example, when the magnetic sensor device 4 is disposed on the substrate 2, the contact portion 33d is pressed by the conductor portion 15 on the substrate 2, thereby aligning the position of the lower surface of the contact portion 33d with the position of the lower surface of the wire support portion 31b. In addition, the contact portion 33d is pressed against the conductor portion 15 by the elastic force of the spring portion 33c, making close contact with the conductor portion 15, thereby achieving a reliable electrical connection with the conductor portion 15.

[0063] (Optical discs and optical sensors)

[0064] The optical disc 5 is configured to rotate along with the rotation axis 100 that rotates relative to the housing 101, while the optical sensor 6 is configured to remain stationary without rotating relative to the housing 101.

[0065] The optical disc 5 is formed into a circular plate shape, for example, from a non-magnetic material such as resin. The optical disc 5 is mounted and fixed to the circumferential surface of the rotation axis 100 at a position lower than the substrate 2, with its plane orthogonal to the rotation axis 100. The optical disc 5 is positioned opposite the substrate 2, separated by an optical sensor 6 disposed on the substrate 2. Specifically, the optical disc 5 has multiple reflective portions (not shown) that reflect detection light and multiple non-reflective portions (not shown) that do not reflect detection light on its upper surface opposite the lower surface of the substrate 2. The multiple reflective portions and multiple non-reflective portions are arranged alternately along the circumference of the optical disc 5.

[0066] The optical sensor 6 includes, for example, a light-emitting part (not shown) such as a light-emitting diode that emits illumination light, and a light-receiving part (not shown) such as a phototransistor that receives detection light and performs photoelectric conversion. The optical sensor 6 is mounted and fixed on the lower surface of the substrate 2 so as to emit illumination light to the upper surface of the optical disc 5 and receive detection light reflected from the upper surface of the optical disc 5.

[0067] (shell)

[0068] Next, details of the housing 22 of the magnetic sensor device 4 will be described. The housing 22 is formed of a non-magnetic material, such as resin. As described above, the housing 22 has a plurality of circular first adjustment holes 40 corresponding to the connecting holes 13 of the substrate 2, for connecting the housing 22 (magnetic sensor device 4) to the substrate 2 by means of connecting members 14 such as bolts, and has circular second adjustment holes 41 corresponding to the insertion holes 10 of the substrate 2 for inserting the magnetic field forming member 3 and the rotating shaft 100. In the housing 22 of this embodiment, the second adjustment hole 41 is provided in the central part of the housing 22, and the three first adjustment holes 40 are arranged at 120-degree intervals along the circumference of the second adjustment holes 41 on the outer peripheral side of the housing 22.

[0069] Additionally, the housing 22 has a plurality of positioning reference holes 42 on its upper surface for positioning relative to the substrate 2. Preferably, at least two positioning reference holes 42 are formed around the second adjustment hole 41. The plurality of positioning reference holes 42 are formed to respectively provide... Figure 13 Multiple positioning bosses 111 of the dedicated positioning fixture 110 shown are inserted. Furthermore, the configuration of the multiple positioning reference holes 42 is not limited.

[0070] In addition to the multiple positioning bosses 111, the positioning fixture 110 also has a fitting cylinder 112 for fitting the outer shape of the magnetic field forming component 3. The design positional relationship between the magnetic sensor 20 and the magnetic field forming component 3 varies depending on the type and individual of the motor and the magnetic sensor device 4. The positional relationship between the multiple positioning reference holes 42 and the magnetic field forming component 3 is determined based on the design positional relationship between the magnetic sensor 20 and the magnetic field forming component 3. Therefore, the positioning fixture 110 is manufactured by determining the positional relationship between the multiple positioning bosses 111 and the fitting cylinder 112 based on the positional relationship between the multiple positioning reference holes 42 and the magnetic field forming component 3.

[0071] With the magnetic field forming component 3 positioned inside the second adjustment hole 41, the connecting component 14, which passes through the first adjustment hole 40 and the connecting hole 13, is fixed to the support column 102, thereby fixing the outer casing 22 to the base plate 2 and the housing 101. By fixing the outer casing 22 to the base plate 2 and the housing 101, the plurality of magnetic sensors 20 are positioned relative to the magnetic field forming component 3 positioned inside the second adjustment hole 41.

[0072] In addition, the housing 22 has an adjustment mechanism that can adjust the position of the multiple magnetic sensors 20 relative to the magnetic field forming component 3 by adjusting the position of the housing 22 relative to the substrate 2 while the optical sensor 6 is positioned relative to the optical disc 5 in the designed position.

[0073] The outer casing 22 has a first adjustment hole 40 as an adjustment mechanism. The first adjustment hole 40 is formed with a diameter larger than that of the connecting member 14 (the connecting hole 13 of the substrate 2) and has a predetermined adjustment range. In addition, the outer casing 22 has a second adjustment hole 41 as an adjustment mechanism. The second adjustment hole 41 is formed with a diameter larger than that of the insertion hole 10 of the substrate 2 and has a predetermined adjustment range.

[0074] That is, compared to the configuration where the connecting member 14, which is inserted into the connecting hole 13, and the first adjustment hole 40 are coaxial, the housing 22 can adjust its position relative to the substrate 2 in a direction parallel to the plane of the substrate 2 (orthogonal to the insertion direction of the connecting member 14), with the degree of freedom of the adjustment range of the first adjustment hole 40, which serves as the adjustment mechanism. At this time, the housing 22 can adjust its position relative to the substrate 2 in a direction parallel to the plane of the substrate 2, without causing the magnetic field forming member 3, which is inserted around the rotation axis 100 of the insertion hole 10, to contact the second adjustment hole 41, with the degree of freedom of the adjustment range of the second adjustment hole 41, so as to sufficiently maintain the distance between itself and the magnetic field forming member 3 (for example, maintain it above a predetermined distance).

[0075] (Assembly of substrate and magnetic sensor device)

[0076] To form the rotation detection device 1, the method for assembling the substrate 2 and the magnetic sensor device 4 into the motor housing 101 is as follows.

[0077] First, electrical / electronic components other than the magnetic sensor device 4 are mounted on the substrate 2. For example, a conductor portion 15 is mounted on the upper surface of the substrate 2, and an optical sensor 6 is mounted on the lower surface of the substrate 2.

[0078] Next, the optical disc 5 is positioned on the outer periphery of the rotation axis 100, and the optical disc 5 is fixed relative to the rotation axis 100.

[0079] Additionally, a substrate 2, which houses electrical / electronic components other than the magnetic sensor device 4, is positioned on the outer periphery of the rotation shaft 100. The substrate 2 is arranged so that its insertion hole 10 is coaxial with the rotation shaft 100 and the magnetic field forming component 3. Furthermore, the substrate 2 is positioned relative to the optical disc 5 already mounted on the rotation shaft 100, with the optical sensor 6 adjusted to its designed position. Then, the substrate 2 is mounted and fixed to the motor housing 101 via the support column 102.

[0080] Next, the housing 22 of the magnetic sensor device 4, which houses three magnetic sensors 20 and three magnetic yokes 21, is positioned on the outer periphery of the rotating shaft 100 and the magnetic field forming component 3 and on the upper surface of the substrate 2. Alternatively, the housing 22 can be positioned such that the first adjustment hole 40 of the housing 22 corresponds to the connecting hole 13 of the substrate 2, and the connecting component 14 is temporarily positioned by inserting it into the first adjustment hole 40 of the housing 22 and the connecting hole 13 of the substrate 2 without tightening it.

[0081] The positioning of the housing 22 relative to the substrate 2 is performed, for example, using a dedicated positioning jig 110. The positioning jig 110 is configured to have a plurality of positioning bosses 111 and fitting cylinders 112 on the lower surface of the base 113. By machining the positioning jig 110 relative to the housing 22, the plurality of positioning bosses 111 are inserted into a plurality of positioning reference holes 42 in the housing 22, and the fitting cylinders 112 are fitted into the shape of the magnetic field forming member 3, thereby positioning the housing 22, i.e., the magnetic sensor device 4, relative to the substrate 2, so that the plurality of magnetic sensors 20 housed in the housing 22 and the magnetic field forming member 3 are in a predetermined design positional relationship.

[0082] After the magnetic sensor device 4 is positioned on the substrate 2, each terminal 33 of each magnetic sensor 20 contacts each conductor portion 15 mounted on the upper surface of the substrate 2. At this time, as the aforementioned adjustment mechanism, since the conductor portion 15 has a larger contact area than the terminal 33, it is possible to maintain contact with the terminal 33 even when the housing 22 is adjusted in the horizontal direction during positioning. In addition, when the terminal 33 contacts the conductor portion 15, the contact portion 33d is pressed by the conductor portion 15, the spring portion 33c elastically deforms, and the contact portion 33d is displaced upward. As a result, the contact portion 33d is in close contact with the conductor portion 15, and the contact portion 33d is reliably electrically connected to the conductor portion 15.

[0083] After positioning the housing 22, the connecting component 14, which is inserted into the first adjustment hole 40 of the housing 22 and the connecting hole 13 of the substrate 2, is fastened and fixed to the motor housing 101.

[0084] In this way, after positioning the optical disc 5 mounted on the rotation axis 100 and the optical sensor 6 mounted on the substrate 2, the housing 22 of the magnetic sensor device 4 can be positioned relative to the substrate 2 without affecting the positional relationship between the optical disc 5 and the optical sensor 6, and the multiple magnetic sensors 20 can be positioned relative to the magnetic field forming component 3.

[0085] By mounting the housing 22 onto the substrate 2, the magnetic field forming member 3 is positioned inside the second adjustment hole 41 of the housing 22 without contacting it. Then, three magnetic sensors 20 and three magnetic yokes 21 are positioned on the outer periphery of the magnetic field forming member 3 while maintaining a predetermined positional relationship. For example, the three magnetic sensors 20 are positioned at 120-degree intervals on the outer periphery of the magnetic field forming member 3 in the rotational direction. Furthermore, each magnetic sensor 20 is configured such that the extension direction of the magnetic wire 30 is parallel to the upper surface of the substrate 2. Additionally, when viewing the substrate 2 from above, each magnetic sensor 20 is positioned such that the central portion of the extension direction of the magnetic wire 30 (strictly speaking, the central portion of the extension direction of the central axis of the magnetic wire 30) is in contact with a predetermined circle coaxial with the second adjustment hole 41 on the outer periphery of the magnetic field forming member 3. Furthermore, the three magnetic yokes 21 are also positioned at 120-degree intervals in the rotational direction of the magnetic field forming member 3, and each magnetic yoke 21 is positioned adjacent to the magnetic sensor 20 on its inner periphery.

[0086] In this way, without affecting the positional relationship between the optical disc 5 and the optical sensor 6, the predetermined positional relationship of the magnetic field forming component 3 for detecting the rotation of the rotating shaft 100, the three magnetic sensors 20, and the three magnetic yokes 21 are determined at once simply by mounting the housing 22 on the substrate 2.

[0087] As described above, according to this embodiment, the rotation detection device 1 for detecting the rotation of the rotation axis 100 (rotating body) includes: a single substrate 2 having an insertion hole 10 for inserting the rotation axis 100; a magnetic field forming member 3 that rotates with the rotation axis 100; a plurality of magnetic sensors 20 disposed around the magnetic field forming member 3; a housing 22 that houses the plurality of magnetic sensors 20 and is disposed on the substrate 2; an optical sensor 6 disposed on the substrate 2 on the side opposite to the plurality of magnetic sensors 20; and an optical disc 5 disposed opposite to the substrate 2 with respect to the optical sensor 6, and rotating with the rotation axis 100. The rotation detection device 1 has an adjustment mechanism that can adjust the position of the plurality of magnetic sensors 20 relative to the magnetic field forming member 3 by adjusting the position of the housing 22 relative to the substrate 2 while the substrate 2 is positioned by adjusting the position of the optical sensor 6 relative to the optical disc 5.

[0088] Therefore, the rotation detection device 1 can easily adjust the design positional relationship between the magnetic field forming component 3 for detecting the rotation of the rotation axis 100 and the magnetic sensor 20 and install the magnetic sensor 20 simply by mounting the housing 22 on the substrate 2 on which the optical sensor 6 is provided, without affecting the positional relationship between the optical disc 5 and the optical sensor 6.

[0089] Specifically, the rotation detection device 1 according to this embodiment includes a connecting member 14 that connects the outer shell 22 to the substrate 2. The substrate 2 has a connecting hole 13 through which the connecting member 14 is inserted. The outer shell 22 has a first adjustment hole 40 as an adjustment mechanism. The first adjustment hole 40 is formed with a diameter larger than that of the connecting member 14 and has a predetermined adjustment range, and is through which the connecting member 14 is inserted. Therefore, without affecting the positional relationship between the optical disc 5 and the optical sensor 6, the outer shell 22 can be moved relative to the substrate 2 in a direction orthogonal to the insertion direction of the connecting member 14 (a direction parallel to the plane of the substrate 2). In this case, compared to the case where the connecting member 14 inserted into the connecting hole 13 and the first adjustment hole 40 are coaxial, the position of the outer shell 22 relative to the substrate 2 can be adjusted with the degree of freedom of the adjustment range of the first adjustment hole 40. Therefore, the position of the magnetic sensor 20 housed in the outer shell 22 relative to the magnetic field forming member 3 can be adjusted.

[0090] Furthermore, according to the rotation detection device 1 of this embodiment, the housing 22 has a second adjustment hole 41 as an adjustment mechanism. The second adjustment hole 41 is formed with a diameter larger than that of the insertion hole 10 and has a predetermined adjustment range, and is used for the insertion of the rotation shaft 100 and the magnetic field forming member 3. Thus, without affecting the positional relationship between the optical disc 5 and the optical sensor 6, the housing 22 can be adjusted relative to the substrate 2 by moving the second adjustment hole 41 in a direction orthogonal to the rotation axis of the rotation shaft 100 (a direction parallel to the plane of the substrate 2) without the magnetic field forming member 3 coming into contact with the second adjustment hole 41, so as to maintain a sufficient distance (for example, above a predetermined distance) between the housing 22 and the magnetic field forming member 3.

[0091] Furthermore, according to the rotation detection device 1 of this embodiment, the magnetic sensor 20 and the substrate 2 each have a terminal 33 (first terminal) and a conductor portion 15 (second terminal) that are in contact with each other. As an adjustment mechanism, the terminal 33 is formed from a compression terminal, and the conductor portion 15 is formed with a contact area larger than that of the compression terminal and has a predetermined adjustment range. Therefore, even when the housing 22 is moved relative to the substrate 2 in a direction parallel to the plane of the substrate 2 for adjustment, the contact between the terminal 33 and the conductor portion 15 can be maintained, and the electrical connection between the terminal 33 and the conductor portion 15 can be maintained.

[0092] Furthermore, the connection between terminal 33 and conductor portion 15 does not require brazing such as reflow soldering. Additionally, since the housing 22 is bonded to the substrate 2 using the connecting member 14, and each magnetic sensor 20 is fixed to the substrate 2, brazing for fixing the housing 22 and each magnetic sensor 20 to the substrate 2 is also unnecessary. Therefore, in this embodiment, after assembling the substrate 2 (without the magnetic sensor device 4 installed) into the motor housing 101, the magnetic sensor device 4 can be installed on the substrate 2, and the magnetic sensor 20 can be positioned relative to the magnetic field forming member 3 while the magnetic sensor device 4 is installed on the substrate 2. Furthermore, in this embodiment, the magnetic sensor 20 is not affected by the heat generated by brazing. Moreover, according to this embodiment, the designed position of the housing 22 relative to the substrate 2 and the designed position of the magnetic sensor 20 relative to the magnetic field forming member 3 will not be shifted due to brazing.

[0093] Furthermore, according to this embodiment, since the magnetic sensor 20 is positioned relative to the magnetic field forming member 3 and the magnetic sensor device 4 is mounted on the substrate 2 after the substrate 2 is assembled to the motor housing 101, even if the substrate 2 is offset from the designed position relative to the housing 101 when the substrate 2 is assembled to the motor housing 101, the positional offset of the substrate 2 relative to the housing 101 can be absorbed by adjusting the position of the magnetic sensor 20 relative to the magnetic field forming member 3 when the magnetic sensor device 4 is mounted on the substrate 2. That is, even if the substrate 2 is offset from the housing 101, the magnetic sensor device 4 can be configured such that the position of the magnetic sensor 20 relative to the magnetic field forming member 3 is the designed position.

[0094] Furthermore, according to this embodiment, even after the magnetic sensor device 4 is combined with the substrate 2, the position of the magnetic sensor device 4 can be easily adjusted without affecting the positional relationship between the optical disc 5 and the optical sensor 6 by loosening or removing the connecting member 14. In addition, the magnetic sensor device 4 can be removed from the motor or reinstalled in the motor without removing the substrate 2 from the housing 101.

[0095] Furthermore, in this embodiment, three magnetic sensors 20 are housed within a housing 22. Within the housing 22, the three magnetic sensors 20 are configured and fixed at predetermined positions for detecting the rotation of the rotating shaft 100. Specifically, within the housing 22, the three magnetic sensors 20 are spaced 120 degrees apart circumferentially in the second adjustment hole 41, and are arranged on a reference plane located on the same plane as the lower surface of the housing 22, with the extension direction of the magnetic wire 30 parallel to the reference plane. Therefore, by simply mounting the housing 22 to the substrate 2, the predetermined design positional relationship between the magnetic field forming member 3 for detecting the rotation of the rotating shaft 100 and the three magnetic sensors 20 can be determined once and with high precision. Thus, for example, compared to determining the position of each magnetic sensor 20 relative to the magnetic field forming member 3 individually, the mounting of the three magnetic sensors 20 to the substrate 2 can be performed easily and accurately.

[0096] In addition, in this embodiment, besides the three magnetic sensors 20, three magnetic yokes 21 are also housed in the housing 22. Inside the housing 22, the three magnetic sensors 20 and the three magnetic yokes 21 are configured and fixed at predetermined positions for detecting the rotation of the rotating shaft 100. Therefore, by simply mounting the housing 22 to the substrate 2, the predetermined design positional relationship of the magnetic field forming component 3, the three magnetic sensors 20, and the three magnetic yokes 21 for detecting the rotation of the rotating shaft 100 can be determined once and with high precision.

[0097] Furthermore, in the above embodiment, an example was described in which three magnetic sensors 20 are arranged at 120-degree intervals and three magnetic yokes 21 are arranged at 120-degree intervals within the housing 22 of the magnetic sensor device 4. However, the arrangement of the three magnetic sensors 20 and the three magnetic yokes 21 of the present invention is not limited to this example. For example, three magnetic sensors 20 may be arranged at a predetermined angle of less than 120 degrees (e.g., 60 degrees) within the housing 22 of the magnetic sensor device 4, and three magnetic yokes 21 may be arranged at the same angular intervals.

[0098] Furthermore, in the above embodiment, an example was described in which three magnetic sensors 20 were arranged in the housing 22 such that the central portion of the magnetic wire 30 in the extension direction when viewed from above is connected to a predetermined circle coaxial with the second adjustment hole 41 at a position closer to the outer periphery of the magnetic field forming member 3. However, the present invention is not limited to this example. For example, the three magnetic sensors 20 may also be arranged such that each magnetic wire 30 intersects the circumference of the predetermined circle. In addition, in this configuration, the arrangement of the magnetic field forming member 3 (the magnetic pole or magnet used to form a rotating magnetic field) in the rotation detection device 1 is also different. Regarding the arrangement of the magnetic field forming member 3, refer to Japanese Patent Application Publication No. 2019-200098. Alternatively, the multiple magnetic sensors 20 may be arranged in other ways.

[0099] Furthermore, in the above embodiment, an example was described where the reference plane for arranging the three magnetic sensors 20 is the same plane as the lower surface of the housing 22, but the present invention is not limited to this example. For example, as long as the reference plane is parallel to the lower surface of the housing 22, it can also be a plane located above or below the lower surface of the housing 22. In this case, the height position of the three magnetic sensors 20 or the height position of the contact portion 33d of each terminal 33 is adjusted to ensure the stability of the magnetic sensor device 4 fixed on the substrate 2 and the contact between each terminal 33 and the conductor portion 15.

[0100] Furthermore, in this invention, the number of magnetic sensors 20 disposed in the housing 22 of the magnetic sensor device 4 is not limited to three; it can be one, two, or four or more. The same applies to the magnetic yoke 21. Alternatively, in this invention, the magnetic sensor device 4 may be configured such that the magnetic yoke 21 is not disposed within the housing 22.

[0101] In the above embodiment, an example of fastening the bolt-connecting member 14 to the support column 102 of the housing 101 to connect the outer shell 22 and the base plate 2 has been described. However, the present invention is not limited to this example. The connecting member 14 may also be fastened to a nut or the like on the lower surface side of the base plate 2 to connect the outer shell 22 and the base plate 2. In addition, the connecting member 14 used to connect the outer shell 22 and the base plate 2 is not limited to a bolt; for example, it may be a rivet, a clip, or the like. Furthermore, the present invention can also be used for purposes other than detecting the rotation of the rotating shaft 100.

[0102] Furthermore, in the above embodiment, an example was described in which the conductor portion 15 is formed with a contact area larger than that of the terminal 33 of the magnetic sensor 20 and has a predetermined adjustment range; however, the present invention is not limited to this example. For example, the terminal 33 of the magnetic sensor 20 may also be formed with a contact area larger than that of the conductor portion 15 and have a predetermined adjustment range.

[0103] Furthermore, in the above embodiment, an example of a magnetic sensor 20 having a terminal 33 with a single contact portion 33d has been described, but the present invention is not limited to this example. For example, the magnetic sensor 20 may also have a terminal 34 having multiple contact portions 34d, specifically, as shown in... Figure 14 As shown, a compression terminal, i.e., a terminal 34, having two contact portions 34d, is used instead of a terminal 33 having a single contact portion 33d. The terminal 34 has a base 34a, a wire connection portion 34b, two spring portions 34c, and two contact portions 34d.

[0104] The base 34a is formed as a plate that is longer in the front-to-back direction. The wire connection portion 34b extends rearward from the rear end of the base 34a and connects to the end of the insulated wire of the coil 32 where the insulation has been removed. Each spring portion 34c is a leaf spring used to displace the contact portion 34d in the vertical direction; for example, it bends downward from the front end of the base 34a, then bends rearward, then tilts downward and extends rearward. One of the two spring portions 34c extends from the left front end of the base 34a, and the other spring portion 34c extends from the right front end of the base 34a. The contact portion 34d is the portion that contacts the conductor portion 15 disposed on the upper surface of the substrate 2 when the magnetic sensor device 4 is combined with the substrate 2. Each contact portion 34d is disposed at the lower rear end of each spring portion 34c, and is formed, for example, by bending upward from the lower rear end of the spring portion 34c.

[0105] Terminal 34 is configured to have two spring portions 34c and two contact portions 34d, with each of the two contact portions 34d contacting a conductor portion 15 disposed on the substrate 2. That is, terminal 34 has two contacts relative to a conductor portion 15. Furthermore, the two spring portions 34c can be elastically deformed independently, thus allowing the two contact portions 34d to be displaced independently in the vertical direction. With this structure, the reliability of contact with the conductor portion 15 can be improved.

[0106] Furthermore, in the above embodiment, an example was described in which the magnetic sensor 20 has a terminal 33 or a terminal 34 that serves as a compression terminal, and the substrate 2 has a conductor portion 15 such as a pad that contacts the terminal 33 or the terminal 34. However, the present invention is not limited to this example. For example, the substrate 2 may also be configured to have a compression terminal, and the magnetic sensor 20 may have a conductor such as a pad.

[0107] Furthermore, in the above embodiment, an example was described in which the first adjustment hole 40 of the housing 22 of the magnetic sensor device 4 is formed with a diameter larger than that of the connecting member 14 and has a predetermined adjustment range, enabling the housing 22 to be adjusted in all directions in the horizontal direction relative to the substrate 2. However, the present invention is not limited to this example. For example, the first adjustment hole 40 may also be formed by extending the second adjustment hole 41 in the circumferential direction, which would only allow the housing 22 to be adjusted in the circumferential direction relative to the substrate 2.

[0108] Furthermore, the present invention may be appropriately modified without departing from the spirit or concept of the invention as can be read from the claims and description in their entirety, and the rotation detection device accompanying such modifications is also included in the technical concept of the present invention.

Claims

1. A rotation detection device for detecting the rotation of a rotating body, characterized in that, have: A single substrate having an insertion hole for inserting the rotating body; The magnetic field generating component rotates along with the rotation of the rotating body; Multiple magnetic sensors are arranged around the magnetic field forming component; A housing that contains the plurality of magnetic sensors and is disposed on the substrate; An optical sensor is disposed on the substrate on the side opposite to the plurality of magnetic sensors; as well as The optical disc is positioned opposite the substrate, separated by the optical sensor, and rotates along with the rotation of the rotating body. The rotation detection device has an adjustment mechanism that, while the substrate is positioned by adjusting the position of the optical sensor relative to the optical disc, adjusts the position of the housing relative to the substrate to adjust the position of the plurality of magnetic sensors relative to the magnetic field forming component.

2. The rotation detection device according to claim 1, characterized in that, It includes a bonding component for bonding the outer shell to the substrate. The substrate has a mating hole through which the mating component is inserted. As the adjustment mechanism, the housing has a first adjustment hole, which is formed with a diameter larger than that of the connecting member and has a predetermined adjustment range, and is for the connecting member to pass through.

3. The rotation detection device according to claim 2, characterized in that, As the adjustment mechanism, the housing has a second adjustment hole, which is formed with a diameter larger than the insertion hole and has a predetermined adjustment range, for the insertion of the rotating body and the magnetic field forming component.

4. The rotation detection device according to claim 2, characterized in that, The magnetic sensor and the substrate each have a first terminal and a second terminal that are in contact with each other. As the adjustment mechanism, one of the first terminal and the second terminal is formed by a compression terminal, and the other of the first terminal and the second terminal is formed by a conductor portion with a contact area larger than that of the compression terminal and having a predetermined adjustment range.

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