Magnetic detection sensor, rotation detection sensor, and cable with attached sensor

Abstract

The present application provides a magnetic detection sensor, a rotation detection sensor, and a cable with the sensor, which are easy to adjust the electrostatic capacity of a capacitor for preventing noise. The rotation detection sensor (1) is provided at the end of a cable (40) with a pair of signal lines (4) and is mounted to a non-rotating member, detects a magnetic field from a magnetic pole rotating with a rotating member, and is provided with: a magnetic sensor (2) having a detection portion (21) including a magnetic detection element and a pair of lead frames (22) extending from the detection portion (21) and used for outputting a detection signal of the detection portion; a housing portion (3) accommodating the magnetic sensor (2); and a capacitor (5) provided separately from the magnetic sensor (2) and accommodated in the housing portion (3), wherein a first joint portion (7) joining the pair of lead frames (22) and the pair of signal lines (4) respectively and a second joint portion (8) joining the pair of lead frames (22) and a pair of leads (51) of the capacitor (5) respectively are provided in the housing portion (3).

Description

[0001] This application is a divisional application; its parent application number is "201910463060X", and the invention title is "Magnetic Detection Sensor, Rotation Detection Sensor and Cable with Sensor". Technical Field

[0002] This invention relates to magnetic detection sensors, rotation detection sensors, and cables with attached sensors. Background Technology

[0003] Currently, for example, a rotation detection device is known for a bearing unit for a wheel and for detecting the rotational speed of a rotating component that rotates with the wheel. As a rotation detection device, for example, a device comprising a component to be detected and a rotation detection sensor for detecting the magnetic field of the component to be detected is known, wherein the component to be detected has multiple magnetic poles along the circumference of the rotating component, and the rotation detection sensor is mounted on a non-rotating component in a manner opposite to the component to be detected.

[0004] As a rotation detection sensor, a technique using a magnetic sensor with a plate-shaped detection section is known. This plate-shaped detection section has a magnetic detection element for detecting a magnetic field from a component being detected, a signal processing circuit for processing a signal output from the magnetic detection element, and a cover that covers both the magnetic detection element and the signal processing circuit.

[0005] Patent document 1 describes a rotation detection sensor in which a capacitor for noise reduction is mounted on a magnetic sensor.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2009-52936 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, as a capacitor for noise reduction, it is desirable to select a capacitor with an electrostatic capacitance that corresponds to external noise. However, in the rotation detection sensor of Patent Document 1, since a noise reduction capacitor is built into the detection section, adjusting the electrostatic capacitance is not easy.

[0011] Therefore, the object of the present invention is to provide a magnetic detection sensor, a rotation detection sensor, and a cable with the sensor attached, which are easy to adjust the electrostatic capacitance of the capacitor used for noise reduction.

[0012] Solution for solving the problem

[0013] To address the aforementioned problems, this invention provides a magnetic detection sensor disposed at the end of a cable having a pair of signal lines, for detecting a magnetic field from a magnetic pole. The pair of signal lines have a central conductor and an insulator covering the outer periphery of the central conductor. The magnetic detection sensor is characterized by comprising: a magnetic sensor having a detection section and a pair of lead frames; the detection section including a magnetic detection element for detecting the magnetic field from the magnetic pole; the pair of lead frames extending from the detection section and used to output a detection signal from the detection section; a housing section for housing the magnetic sensor; and a capacitor connected to the magnetic sensor. The device is disposed separately and housed in the housing. The housing has a first joint and a second joint. The first joint is respectively joined to the center conductor of the pair of lead frames and the pair of signal lines. The second joint is respectively joined to the pair of lead frames and the pair of leads of the capacitor. The pair of lead frames are respectively formed as plates. The first joint is provided on one side of the lead frame and the second joint is provided on the other side of the lead frame. The center conductor and the lead overlap across the lead frames in a direction that intersects the length direction of the lead frames.

[0014] Furthermore, to solve the aforementioned problems, the present invention provides a rotation detection sensor, which is disposed at the end of a cable having a pair of signal lines and mounted on a non-rotating component that does not rotate with the rotation of the rotating component. The pair of signal lines have a central conductor and an insulator covering the outer periphery of the central conductor. The rotation detection sensor detects the rotation of the rotating component by detecting the magnetic field from a magnetic pole rotating with the rotating component. The rotation detection sensor is characterized by comprising: a magnetic sensor having a detection section and a pair of lead frames; the detection section includes a magnetic detection element for detecting the magnetic field from the magnetic pole; and the pair of lead frames extend from the detection section and are used to output the detected magnetic field. The magnetic sensor is detected by a detection signal; a housing portion that houses the magnetic sensor; and a capacitor that is separately disposed from the magnetic sensor and housed within the housing portion. The housing portion contains a first joint and a second joint. The first joint joins the center conductor of the pair of lead frames and the pair of signal lines. The second joint joins the pair of lead frames and a pair of leads of the capacitor. The pair of lead frames are each formed in a plate shape. The first joint is provided on one side of the lead frame, and the second joint is provided on the other side of the lead frame. The center conductor and the leads overlap across the lead frames in a direction intersecting the length direction of the lead frames.

[0015] Furthermore, in order to solve the aforementioned problems, the present invention provides a cable with an attached sensor, comprising: a cable having a pair of signal lines, the pair of signal lines having a central conductor and an insulator covering the outer periphery of the central conductor; and a rotation detection sensor disposed at one end of the cable and mounted on a non-rotating component that does not rotate with the rotation of the rotating component, the rotation detection sensor detecting the rotation of the rotating component by detecting a magnetic field from a magnetic pole rotating with the rotating component, the cable with the attached sensor being characterized in that the rotation detection sensor comprises: a magnetic sensor having a detection part and a pair of lead frames, the detection part including a magnetic detection element for detecting a magnetic field from the magnetic pole, the pair of lead frames being positioned above... The detection unit extends out and is used to output the detection signal of the detection unit; a housing portion houses the magnetic sensor; and a capacitor is separately disposed from the magnetic sensor and housed within the housing portion. A first joint portion and a second joint portion are provided within the housing portion. The first joint portion is respectively joined to the center conductor of the pair of lead frames and the pair of signal lines. The second joint portion is respectively joined to the pair of lead frames and the pair of leads of the capacitor. The pair of lead frames are respectively formed in a plate shape. The first joint portion is provided on one side of the lead frame, and the second joint portion is provided on the other side of the lead frame. The center conductor and the lead overlap across the lead frames in a direction that intersects the length direction of the lead frames.

[0016] The effects of the invention are as follows.

[0017] According to the present invention, a magnetic detection sensor, a rotation detection sensor, and a cable with an attached sensor are provided, which are easy to adjust the electrostatic capacitance of the capacitor used for noise reduction. Attached Figure Description

[0018] Figure 1 This is a perspective view showing the appearance of a rotation detection sensor according to one embodiment of the present invention.

[0019] Figure 2 It was omitted. Figure 1 A three-dimensional view of the shell section.

[0020] Figure 3 (a) is Figure 2 (a) is the top view of the structure, and (b) is its sectional view along line AA.

[0021] Figure 4 (a) is in Figure 2 The perspective view of the bracket is further omitted in (b), which is its side view.

[0022] Figure 5 (a) is from Figure 4(a) is a top view viewed from the signal line side, and (b) is a top view viewed from the capacitor side.

[0023] Figure 6 The diagram shows a cable with an accompanying sensor, representing a variation of the present invention. (a) is a simplified structural diagram, and (b) is a cross-sectional view of the cable.

[0024] Figure 7 The diagram shows a rotation detection sensor of a modified example of the present invention. (a) is a perspective view showing the appearance, and (b) is a perspective view omitting its housing portion.

[0025] Figure 8 (a) and (b) are further omitted. Figure 7 A three-dimensional view of the support structure in (b).

[0026] Explanation of symbols

[0027] 1—Rotational detection sensor, 10—Cable with connector, 2—Magnetic sensor, 21—Detection unit, 22—Lead frame, 3—Housing unit, 4—Signal line, 40—Cable, 5—Capacitor, 51—Lead, 7—First joint, 8—Second joint. Detailed Implementation

[0028] [Implementation Method]

[0029] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0030] Figure 1 This is a perspective view showing the appearance of the rotation detection sensor of this embodiment. Figure 2 It was omitted. Figure 1 A three-dimensional view of the shell section. Figure 3 (a) is its top view. Figure 3 (b) is Figure 3 A sectional view along line AA in (a). And, Figure 4 (a) is in Figure 2 The 3D diagram of the support structure is further omitted. Figure 4 (b) is its side view. Figure 5 (a) is in Figure 4 Top view from the signal line side. Figure 5 (b) is a top view taken from its capacitor side.

[0031] The rotation detection sensor 1 is mounted on a non-rotating component that does not rotate with the rotating component. It detects the rotation of the rotating component by detecting the magnetic field from a magnetic pole that rotates with it. In this embodiment, the rotation detection sensor 1 is mounted on an automobile and used to detect the rotational speed (wheel speed) of the wheels. In this case, a detection component with multiple magnetic poles circumferentially around its rotation axis is provided in the wheel (inner rim), which is a rotating component. The rotation detection sensor 1 is mounted on a non-rotating component such as a steering knuckle, facing the non-detection component radially (radially around the rotation axis).

[0032] like Figures 1 to 5 As shown, the rotation detection sensor 1 is located at the end of a cable 40 having a pair of signal lines 4, and includes a magnetic sensor 2, a housing 3, and a capacitor 5. The cable 10 with the accompanying sensor in this embodiment includes the cable 40 and the rotation detection sensor 1.

[0033] The magnetic sensor 2 has a detection section 21 and a pair of lead frames (connection terminals) 22 extending from the detection section 21. The detection section 21 includes a magnetic detection element (not shown) that detects the magnetic field from the magnetic poles mounted on the rotating component, a signal processing circuit (not shown) that processes the signal output from the magnetic detection element, and a resin molded body 21a that covers the magnetic detection element and the signal processing circuit. The detection section 21 is formed into a plate shape that is approximately rectangular (with one corner of the rectangle beveled) when viewed from above. The detection axis (detection direction of the magnetic field) of the magnetic detection element is... Figure 3 The up and down direction in (a) (the tangent direction of the circle centered on the rotation axis of the rotating component). For example, Hall elements, GMR (Giant Magneto-Resistive) elements, TMR (Tunneling Magneto-Resistive) elements, etc. can be used as magnetic sensors 2.

[0034] A pair of lead frames 22 are used to output the detection signal (output signal from the signal processing circuit) of the detection unit 21, extending from one long side of the detection unit 21 (the long side not connected to the chamfered corner) in a direction perpendicular to that long side. The two lead frames 22 are formed parallel to each other. In this embodiment, the two lead frames 22 are formed in a plate-like (strip-like) shape. The two lead frames 22 are configured to be substantially parallel to the detection unit 21.

[0035] Each pair of signal lines 4 has a center conductor 4a made of stranded wires such as copper that have good conductivity, and an insulator 4b covering the outer periphery of the center conductor 4a and made of an insulating resin such as cross-linked polyethylene. The pair of signal lines 4 are together covered by a sheath 41. The cable 40 is configured such that the sheath 41 covers the pair of signal lines 4.

[0036] At the end of the cable 40, a pair of signal lines 4 protrude from the sheath 41, and further, at the end of the signal lines 4, the center conductor 4a protrudes from the insulator 4b. The center conductor 4a exposed from the insulator 4b is joined and electrically connected to the lead frame 22 of the corresponding magnetic sensor 2 by resistance welding. The portion that joins the pair of lead frames 22 and the pair of signal lines 4 (center conductor 4a) is referred to as the first joint 7. The first joint 7 will be described in detail below.

[0037] Capacitor 5 is a capacitor element used for noise reduction. In this embodiment, capacitor 5 is separately disposed from magnetic sensor 2. Capacitor 5 has a pair of leads 51, which are connected to and electrically joined to the lead frame 22 of the corresponding magnetic sensor 2 by resistance welding. The portion that joins the pair of lead frames 22 and the pair of leads 51 is referred to as the second joint 8. The second joint 8 will be described in detail below.

[0038] The housing portion 3 integrally forms a generally cylindrical main body portion 31 and a flange portion 32 for fixing the rotation detection sensor 1 to a non-rotating component. The main body portion 31 covers the magnetic sensor 2, the end of the cable 40 (the end of a pair of signal lines 4), and the capacitor 5. The main body portion 31 covers the end of the sheath 41 of the cable 40, and the signal lines 4 extend from the sheath 41 within the main body portion 31. A bolt hole 32a is formed in the flange portion 32 for a fixing bolt (not shown) to pass through, and a cylindrical retaining ring 33 made of metal is provided in the bolt hole 32a along the inner circumferential surface of the bolt hole 32a. The retaining ring 33 is used to suppress deformation of the flange portion 32 when the bolt is fixed.

[0039] The housing 3 is formed by molding resin. In this embodiment, a support 6 is provided, which protects the magnetic sensor 2 and the capacitor 5 during resin molding and holds these components in the metal mold for molding.

[0040] The support 6 has a concave capacitor housing space 63 enclosed by a bottom wall 61 and a side wall 62, and a capacitor 5 is housed within this capacitor housing space 63. In this embodiment, the capacitor 5 is disposed on the bottom wall 61 of the support 6, and a pair of signal lines 4 are disposed on the capacitor 5. That is, in this embodiment, the capacitor 5 and the pair of signal lines 4 are disposed on the bottom wall 61 in an overlapping manner (in a direction orthogonal to the bottom wall 61). Furthermore, the pair of signal lines 4 are arranged in a direction parallel to the bottom wall 61. By configuring it in this way, damage to the capacitor 5 due to the heat of the resin can be suppressed during resin molding.

[0041] For example, components made of PA (polyamide) 612, nylon 66 (nylon is a registered trademark), PBT (polybutylene terephthalate), etc., can be used as the housing part 3. Furthermore, components made by mixing glass fillers into the resin can also be used as the housing part 3. In order to integrate the housing part 3 with the resin during molding, it is best to use a component made of the same material as the housing part 3 (material with the same main components) as the support 6.

[0042] (First joint 7 and second joint 8)

[0043] In the rotation detection sensor 1 of this embodiment, the noise-proof capacitor 5 and the magnetic sensor 2 are separately provided, and a first joint 7 and a second joint 8 are provided in the housing part 3. The first joint 7 is respectively connected to a pair of lead frames 22 and a pair of signal lines 4, and the second joint 8 is respectively connected to a pair of lead frames 22 and a pair of leads 51 of the capacitor 5.

[0044] By separating the noise-damping capacitor 5 from the magnetic sensor 2, the electrostatic capacitance of the capacitor 5 can be easily changed according to the application (i.e., the external noise in the operating environment). In the prior art, where the noise-damping capacitor 5 is integrated into the magnetic sensor 2, it is necessary to select a magnetic sensor 2 with an appropriate electrostatic capacitance for the application, and sometimes a specially designed magnetic sensor 2 is required, leading to increased costs. By separating the capacitor 5 from the magnetic sensor 2 as in this embodiment, the electrostatic capacitance of the capacitor 5 can be easily changed. Therefore, regardless of the operating environment, the currently used magnetic sensor 2 can still be used, reducing costs and allowing for the selection of an appropriate electrostatic capacitance to further improve resistance to external noise.

[0045] When the capacitor 5 is separately mounted from the magnetic sensor 2, it is necessary to avoid the effects of heat caused by molding resin to form the housing 3. However, by appropriately adjusting the length of the lead 51 of the capacitor 5, the freedom of placement of the capacitor 5 within the housing 3 can be increased. In other words, by appropriately adjusting the length of the lead 51, the capacitor 5 can be housed in the capacitor storage space 63, which does not come into direct contact with the molten resin during molding, thus preventing damage to the capacitor 5.

[0046] In this embodiment, as described above, the pair of lead frames 22 are each formed in a plate-like (strip-like) shape. A first joint 7 is provided on one side (front) of the lead frame 22, and a second joint 8 is provided on the other side (back) of the lead frame 22. That is, the signal line 4 (center conductor 4a) is joined on one side of the lead frame 22, and the capacitor 5 (lead 51) is joined on the other side. Therefore, compared with the case where both the signal line 4 and the capacitor 5 are joined on one side of the lead frame 22, the joint can be made more compact overall, which helps to miniaturize the rotation detection sensor 1. In this embodiment, since the capacitor 5 is housed in the capacitor housing space 63, the second joint 8 is provided on the bottom wall 61 side of the capacitor housing space 63.

[0047] Furthermore, in this embodiment, the first joint 7 and the second joint 8 are positioned in a non-overlapping location along the length of the lead frame 22. When joining by resistance welding, electrodes need to be arranged in a way that clamps the joined components; however, if the first joint 7 and the second joint 8 overlap along the length of the lead frame 22, electrode arrangement becomes difficult. As shown in this embodiment, by setting the first joint 7 and the second joint 8 in a non-overlapping location along the length of the lead frame 22, the joining operations of the signal line 4 and the lead 51 can be performed individually, improving workability and productivity.

[0048] In this embodiment, a first joint 7 is provided at the front end of the lead frame 22 (the end opposite to the detection section 21), and a second joint 8 is provided at a position closer to the base end (detection section 21 side) than the first joint 7. In this embodiment, the capacitor housing space 63 is located on the extension side of the cable 40 compared to the second joint 8, so the lead 51 of the capacitor 5 extends from the second joint 8 towards the first joint 7. Therefore, during the bonding operation, it is preferable to first bond the center conductor 4a of the signal line 4 to the surface of the lead frame 22 to form the first joint 7, and then bond the lead 51 of the capacitor 5 to the back of the lead frame 22 to form the second joint 8.

[0049] (Example of a modified cable with attached sensor)

[0050] In the above embodiment, the cable 40 is configured to cover a pair of signal lines 4 together with the sheath 41, but it is not limited to this. The cable 40 may also include wires other than the signal lines 4 used by the rotation detection sensor 1.

[0051] For example, in Figure 6In the sensor-attached cable 10a shown in (a) and (b), the cable 40a includes: a twisted pair 42 formed by twisting a pair of signal lines 4; a pair of power lines 43 with an outer diameter and conductor cross-sectional area larger than that of the signal lines 4; a strap member 45 spirally wound around the assembly 44 formed by the twisted pair 42 and the power lines 43; and a sheath 41 covering the outer periphery of the strap member 45.

[0052] A rotation detection sensor 1 is provided at one end of the twisted pair cable 42. A vehicle body side sensor connector 91 is installed at the other end of the twisted pair cable 42. The vehicle body side sensor connector 91 is used to connect to the wiring harness located in the relay box of the vehicle body.

[0053] In this embodiment, the power line 43 is composed of a power line for supplying drive current to an electric motor (not shown) for an electric parking brake (hereinafter EPB) mounted on the wheels of the vehicle.

[0054] EPB refers to an electric braking system that, when the vehicle is stopped, outputs a drive current to an electric motor after a predetermined time (e.g., 1 second) when the parking brake switch is switched from the off state to the on state. This causes the electric motor to press the brake pads against the disc rotor of the wheel, thus generating braking force. Furthermore, the EPB is configured such that when the parking brake switch is switched from the on state to the off state, or when the accelerator pedal is depressed, a drive current is output to the electric motor, causing the brake pads to disengage from the disc rotor of the wheel, releasing the braking force on the wheel. In other words, the EPB operates from the moment the parking brake switch is switched on until the parking brake switch is switched off or the accelerator pedal is depressed.

[0055] The power cord 43 has a center conductor 43a and an insulator 43b covering the outer periphery of the center conductor 43a. The center conductor 43a is made of stranded wire, which is made of copper or other conductive wires, and the insulator 43b is made of cross-linked polyethylene or other insulating resin. A wheel-side power connector 92 for connecting to an electric motor for EPB is installed at one end of the pair of power cords 43, and a vehicle-side power connector 93 for connecting to the wiring harness in the relay box is installed at the other end of the pair of power cords 43.

[0056] Furthermore, in the EPB, drive current is supplied to the electric motor essentially when the vehicle is stationary. In contrast, the rotation detection sensor 1 is used when the vehicle is in motion, and is not used when drive current is supplied to the power line 43. Therefore, in this embodiment, the shielding conductor surrounding the power line 43 and the twisted pair 42 is omitted. By omitting the shielding conductor, the outer diameter of the cable 40a can be reduced compared to the case where a shielding conductor is provided, and the number of components can also be reduced to suppress costs.

[0057] A plurality of filamentous (fibrous) intermediaries 46 extending along the length of the cable 40a are disposed between the twisted pair 42, the power line 43, and the tape component 45. In this embodiment, the intermediaries 46, the twisted pair 42, and the power line 43 are twisted together to form an assembly 44. This allows the cross-sectional shape of the tape component 45 when wound around the outer periphery of the assembly 44 to be closer to a circle. Polypropylene yarn, short fiber yarn (rayon short fiber), aramid fiber, nylon fiber, or fibrous materials such as fiber-based plastics, paper, or cotton filaments can be used as the intermediaries 46.

[0058] A strip member 45 is spirally wound around the assembly 44, and the strip member 45 contacts all the wires (a pair of signal lines 4 and a pair of power lines 43) covered by the strip member 45. The strip member 45 is located between the assembly 44 and the sheath 41, and serves to reduce the friction between the assembly 44 (signal lines 4 and power lines 43) and the sheath 41 when bending. That is, by providing the strip member 45, the friction between the signal lines 4 and power lines 43 and the sheath 41 can be reduced without the use of lubricants such as talcum powder, and the stress applied to the signal lines 4 and power lines 43 when bending is reduced, thereby improving bending resistance.

[0059] It is desirable to use a component (a component with a low coefficient of friction) that can easily slide relative to the insulator 4b of the signal line 4 and the insulator 43b of the power line 43 as the tape component 45. For example, a component made of non-woven fabric, paper, or resin (resin film, etc.) can be used. The tape component 45 is spirally wound around the assembly 44 with a portion overlapping in its width direction (the direction perpendicular to the length and thickness directions of the tape component 45). Furthermore, the overlapping portion of the tape component 45 is not bonded with adhesives or the like.

[0060] (Example of a modified magnetic sensor)

[0061] In the above embodiment, the case where the lead frame 22 extends parallel to the detection unit 21 has been described, but it is not limited to this; the lead frame 22 may also be appropriately bent. For example, it may be as follows: Figure 7 (a), (b) and Figure 8As shown in (a) and (b) of the rotary detection sensor 1a, the lead frame 22 is bent at approximately a right angle at its base end (the end on the side of the detection section 21). This shortens the overall length of the rotary detection sensor 1a, resulting in a smaller rotary detection sensor 1a.

[0062] (The role and effects of the implementation method)

[0063] As described above, in the rotation detection sensor 1 of this embodiment, there is a noise-proof capacitor 5 that is separately disposed from the magnetic sensor 2 and housed in the housing part 3, and there is a first joint part 7 that connects a pair of lead frames 22 and a pair of signal lines 4 respectively, and a second joint part 8 that connects a pair of lead frames 22 and a pair of lead lines 51 that connects a pair of lead frames 22 and the capacitor 5 respectively.

[0064] By constructing it in this way, the electrostatic capacitance of the noise-proof capacitor 5 can be easily adjusted according to the external noise of the usage environment, and a rotation detection sensor 1 with good characteristics against external noise can be realized at low cost.

[0065] (Summary of Implementation Methods)

[0066] Next, the technical ideas that can be grasped from the embodiments described above will be described using reference numerals and the like. It should be noted that the reference numerals and the like used in the following description do not limit the constituent elements in the claims to the components specifically shown in the embodiments.

[0067] [1] A magnetic detection sensor 1 is provided at the end of a cable 40 having a pair of signal lines 4 to detect magnetic fields from magnetic poles. The magnetic detection sensor 1 includes: a magnetic sensor 2 having a detection part 21 and a pair of lead frames 22. The detection part 21 includes a magnetic detection element for detecting magnetic fields from the magnetic poles. The pair of lead frames 22 extend from the detection part 21 and are used to output the detection signal of the detection part 21; a housing part 3 for housing the magnetic sensor 2; and a capacitor 5 separately provided from the magnetic sensor 2 and housed in the housing part 3. A first joint part 7 and a second joint part 8 are provided in the housing part 3. The first joint part 7 is respectively joined to the pair of lead frames 22 and the pair of signal lines 4, and the second joint part 8 is respectively joined to the pair of lead frames 22 and the pair of leads 51 of the capacitor 5.

[0068] [2] A rotation detection sensor 1 is provided at the end of a cable 40 having a pair of signal lines 4 and is installed on a non-rotating component that does not rotate with the rotation of the rotating component. The rotation detection sensor 1 detects the rotation of the rotating component by detecting the magnetic field from the magnetic pole that rotates with the rotating component. The rotation detection sensor 1 includes: a magnetic sensor 2 having a detection part 21 and a pair of lead frames 22. The detection part 21 includes a magnetic detection element for detecting the magnetic field from the magnetic pole. The pair of lead frames 22 extend from the detection part 21 and are used to output the detection signal of the detection part 21; a housing part 3 for housing the magnetic sensor 2; and a capacitor 5 separately provided from the magnetic sensor 2 and housed in the housing part 3. A first joint part 7 and a second joint part 8 are provided in the housing part 3. The first joint part 7 is respectively joined to the pair of lead frames 22 and the pair of signal lines 4, and the second joint part 8 is respectively joined to the pair of lead frames 22 and the pair of leads 51 of the capacitor 5.

[0069] [3] Based on the rotation detection sensor 1 described in [2], the pair of lead frames 22 are respectively formed as plates, and the first joint 7 is provided on one side of the lead frame 22, and the second joint 8 is provided on the other side of the lead frame 22.

[0070] [4] Based on the rotation detection sensor 1 described in [3], the first joint 7 and the second joint 8 are provided at positions that do not overlap in the length direction of the lead frame 22.

[0071] [5] A cable 10 with an attached sensor includes: a cable 40 having a pair of signal lines 4; and a rotation detection sensor 1, which is disposed at the end of the cable 40 and mounted on a non-rotating component that does not rotate with the rotation of the rotating component. The rotation detection sensor 1 detects the rotation of the rotating component by detecting the magnetic field from a magnetic pole that rotates with the rotating component. In the cable 10 with the attached sensor, the rotation detection sensor 1 includes: a magnetic sensor 2 having a detection part 21 and a pair of lead frames 22. The detection part 21 includes a magnetic sensor for detecting magnetic fields from a magnetic pole that rotates with the rotating component. The magnetic field detection element of the magnetic poles includes a pair of lead frames 22 extending from the detection section 21 and used to output the detection signal of the detection section 21; a housing section 3, which houses the magnetic sensor 2; and a capacitor 5, which is separately disposed from the magnetic sensor 2 and housed in the housing section 3. The housing section 3 is provided with a first joint section 7 and a second joint section 8. The first joint section 7 is respectively connected to the pair of lead frames 22 and the pair of signal lines 4, and the second joint section 8 is respectively connected to the pair of lead frames 22 and the pair of leads 51 of the capacitor 5.

[0072] [6] Based on the cable 10 with attached sensor described in [5], the pair of lead frames 22 are respectively formed as plates, with the first joint 7 provided on one side of the lead frame 22 and the second joint 8 provided on the other side of the lead frame 22.

[0073] [7] Based on the cable 10 with attached sensor described in [6], the first joint 7 and the second joint 8 are provided at positions that do not overlap in the length direction of the lead frame 22.

[0074] The embodiments of the present invention have been described above, but the embodiments described above do not limit the invention as claimed. Furthermore, it should be noted that all combinations of features described in the embodiments are not essential for solving the problems of the invention.

[0075] The present invention can be implemented in appropriate variations without departing from its spirit. For example, in the above embodiment, the case where the rotation detection sensor 1 is a device for detecting wheel speed has been described, but it is not limited thereto. For example, the present invention can also be applied to drive shaft sensors, crank angle sensors, etc.

[0076] Furthermore, in the above embodiment, the case where a noise-damping capacitor is not provided in the detection section 21 of the magnetic sensor 2 has been described, but it is not limited to this; a noise-damping capacitor may also be provided in the detection section 21 of the magnetic sensor 2. In this case, the capacitor 2, which is separately provided from the magnetic sensor 2, functions to adjust the electrostatic capacitance according to external noise.

Claims

1. A magnetic detection sensor, disposed at the end of a cable having a pair of signal lines, for detecting a magnetic field from a magnetic pole, wherein the pair of signal lines have a central conductor and an insulator covering the outer periphery of the central conductor, the magnetic detection sensor being characterized in that it comprises: A magnetic sensor having a detection section and a pair of lead frames, wherein the detection section includes a magnetic detection element for detecting a magnetic field from the magnetic poles, and the pair of lead frames extend from the detection section and are used to output the detection signal of the detection section. The housing portion, which houses the aforementioned magnetic sensor; and The capacitor is separately disposed from the aforementioned magnetic sensor and housed within the aforementioned housing. The housing portion includes a first joint and a second joint. The first joint connects the center conductors of the pair of lead frames and the pair of signal lines, respectively. The second joint connects the pair of lead frames and the pair of leads of the capacitor, respectively. The aforementioned pair of lead frames are each formed into a plate shape. The first joint is provided on one side of the lead frame, and the second joint is provided on the other side of the lead frame. The center conductor and the lead wire overlap across the lead frame in the thickness direction of the lead frame, which intersects the length direction of the lead frame.

2. The magnetic detection sensor according to claim 1, characterized in that, The pair of signal lines and the capacitor are arranged overlappingly in a direction that intersects the extension direction of the cable extending from the housing portion.

3. The magnetic detection sensor according to claim 1 or 2, characterized in that, The direction in which the center conductor extends from the insulator is the same as the direction in which the lead wire extends.

4. The magnetic detection sensor according to claim 1 or 2, characterized in that, The first joint and the second joint are located at positions that do not overlap in the length direction of the lead frame.

5. A rotation detection sensor, disposed at the end of a cable having a pair of signal lines, and mounted on a non-rotating component that does not rotate with the rotation of a rotating component, wherein the pair of signal lines have a central conductor and an insulator covering the outer periphery of the central conductor. The aforementioned rotation detection sensor detects the rotation of the aforementioned rotating component by detecting the magnetic field from the magnetic poles that rotate together with the rotating component. The aforementioned rotation detection sensor is characterized by having: A magnetic sensor having a detection section and a pair of lead frames, wherein the detection section includes a magnetic detection element for detecting a magnetic field from the magnetic poles, and the pair of lead frames extend from the detection section and are used to output the detection signal of the detection section. The housing portion, which houses the aforementioned magnetic sensor; and The capacitor is separately disposed from the aforementioned magnetic sensor and housed within the aforementioned housing. The housing portion includes a first joint and a second joint. The first joint engages the center conductors of the pair of lead frames and the pair of signal lines. The second joint engages the pair of lead frames and the pair of leads of the capacitor. The aforementioned pair of lead frames are each formed into a plate shape. The first joint is provided on one side of the lead frame, and the second joint is provided on the other side of the lead frame. The center conductor and the lead wire overlap across the lead frame in the thickness direction of the lead frame, which intersects the length direction of the lead frame.

6. A cable with an attached sensor, comprising: A cable having a pair of signal wires, the pair of signal wires having a center conductor and an insulator covering the outer periphery of the center conductor; and A rotation detection sensor is located at the end of the cable and mounted on a non-rotating component that does not rotate with the rotating component. The rotation detection sensor detects the rotation of the rotating component by detecting the magnetic field from a magnetic pole that rotates with the rotating component. The cable with the aforementioned sensor is characterized in that, The aforementioned rotation detection sensor includes: A magnetic sensor having a detection section and a pair of lead frames, wherein the detection section includes a magnetic detection element for detecting a magnetic field from the magnetic poles, and the pair of lead frames extend from the detection section and are used to output the detection signal of the detection section. The housing portion, which houses the aforementioned magnetic sensor; and The capacitor is separately disposed from the aforementioned magnetic sensor and housed within the aforementioned housing. The housing portion includes a first joint and a second joint. The first joint connects the center conductors of the pair of lead frames and the pair of signal lines, respectively. The second joint connects the pair of lead frames and the pair of leads of the capacitor, respectively. The aforementioned pair of lead frames are each formed into a plate shape. The first joint is provided on one side of the lead frame, and the second joint is provided on the other side of the lead frame. The center conductor and the lead wire overlap across the lead frame in the thickness direction of the lead frame, which intersects the length direction of the lead frame.

Images