JP2006113039A - Magnetism detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetism detection device which can obtain a linear magnetic field change by a simple structure. <P>SOLUTION: The magnetism detection device 1 consists of a magnet 2, a magnetic body 3 and a magnetism detection element 4. The magnet 2 and the magnetic body 3 is installed on a shift lever. The magnetism detection element 4 is mounted on the vehicle body. On the magnetic body 3, a slit 5 is formed for the penetration of a magnetic flux B of the magnet 2 to the magnetism detection element 4 side. The shape of the slit 5 is formed so as to have the linear magnetic field change when the magnetic field is detected by the magnetism detection element 4 in the case of the shift lever operation. The magnetism detection element 4 detects the magnetic flux B which has penetrated through the slit 5 and outputs the linear output signal accompanied with a movement of the magnet 2 and the magnetic body 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnetic detection device that detects, for example, the position of a position detection component by a magnetic detection element detecting a magnetic field generated by a magnet.

  Conventionally, a magnetic detection device has been used as a device for detecting an operation position of a vehicle shift lever. This magnetism detection device, for example, attaches a magnet to the shift lever and attaches a magnetism detection element to the vehicle body, and detects the operating position of the shift lever from the output signal output by the magnetism detection element when the magnetic field of the magnet is detected. To do. In this type of magnetic detection element, in order to obtain the operation position of the shift lever, it is necessary to output a linear (linear) output signal according to the operation position of the shift lever, that is, the relative position of the magnet and the magnetic detection element. is there. For this reason, many structures have been proposed in which the magnetic field change (magnetic field change) detected by the magnetic detection element is in a linear state.

In addition, among the magnetic detection devices that use such a linear magnetic field strength fluctuation, there is an angle sensor (angle detection device) for viewing the rotation angle. An example of this sensor is disclosed in Patent Document 1, for example. In the angle sensor of the document 1, a pair of magnets is provided at the end of the rotating shaft, and a magnetic detection element is attached to the fixed side. As an example of the magnetic detection element, a Hall element is used, and the magnetic detection element is disposed on a magnetic path generated by a magnet. When the rotating shaft rotates, the magnetic field applied to the Hall element also changes accordingly. Therefore, the rotation angle (rotational position) of the rotating shaft is detected based on the output signal output from the Hall element.
JP 2001-317909 (page 4-9, Fig. 2)

  Here, as one method for obtaining a linear magnetic field change, a method of devising the shape of the magnet can be considered. However, this method has a problem that it is difficult to actually determine the shape of the magnet that can obtain a linear magnetic field change, and if the shape is complicated even if the shape is obtained, the machining operation to make the magnet into that shape There is a problem that is difficult.

  Further, in the magnetic detection device of Patent Document 1, in order to linearly change the output signal of the Hall element in accordance with the rotation of the rotating shaft, the magnetic field generated by the two magnets must be considered, and the magnet and the Hall element As a result, it is necessary to make detailed settings such as the arrangement position of the magnet and the direction of the magnet, which causes a problem that the structure becomes complicated. Moreover, it is necessary to provide magnets in pairs, and there is a concern that the number of parts is large. Furthermore, the magnet and the Hall element have to be arranged only at the position of the end portion of the rotating shaft, and there are positional restrictions regarding the component arrangement.

  An object of the present invention is to provide a magnetic detection device capable of obtaining a linear magnetic field change with a simple structure.

  In order to solve the above problems, in the invention according to claim 1, the magnet magnetized in one direction, the magnetic sensitive surface is the magnetization direction of the magnet, and the magnet detected by the magnetic sensitive surface A magnetic detection element that outputs an output signal corresponding to the magnetic field strength; and a magnetic body disposed between the magnet and the magnetic detection element, wherein one of the magnetic body and the magnetic detection element is relative to the other. A slit that is movable and has a different width along the moving direction is formed in the magnetic body, and when one of the magnetic body and the magnetic detection element moves relative to the other, the magnetic detection element is moved to the slit. The gist is to output the output signal by detecting the magnetic field of the magnet via the.

  According to the present invention, slits having different widths are formed in the magnetic body along the moving direction of the magnetic body (or magnetic detection element), and when one of the magnetic body and the magnetic detection element moves relative to the other, When the magnetic detection element detects the magnetic field passing through the slit, the relative position between the magnetic body and the magnetic detection element is detected. At this time, since the amount of magnetic flux passing through the slit and the amount of magnetic flux shielded by the magnetic body change according to the slit width, if the slit width is set to a suitable value, the magnetic detection element is moved during the movement. The strength of the magnetic field to be detected changes linearly. Therefore, if the magnetic detection element detects this magnetic field, the output signal generated by the magnetic detection element changes linearly. Therefore, it is possible to obtain a linear magnetic field change with a simple structure in which the magnetic body having the slit is disposed between the magnet and the magnetic detection element.

  According to a second aspect of the present invention, in the first aspect of the invention, one of the magnetic body and the magnetic detection element is linearly movable with respect to the other, and the magnet and the magnetic detection element are linearly moved. It is arranged in a state in which the slits are arranged in a direction orthogonal to the direction, and the gist is that the slits are provided so as to penetrate in the orthogonal direction.

  According to the present invention, in addition to the operation of the invention described in claim 1, when one of the magnetic body and the magnetic detection element moves linearly with respect to the other, the magnetic field detected by the magnetic detection element at that time is linearly moved. Together, its strength changes linearly. For this reason, when one of the magnetic body and the magnetic detection element linearly moves with respect to the other, the output signal output by the magnetic detection element is output with a linear output change in accordance with the linear movement. Accordingly, since the relative position between the magnetic body and the magnetic detection element can be calculated by an arithmetic expression of a linear function, the moving position of an object in which one moves linearly with respect to the other can be calculated with a simple calculation program. .

  According to a third aspect of the present invention, in the first aspect of the present invention, one of the magnetic body and the magnetic detection element is rotatable with respect to the other, the magnetic body is formed in a curved shape, and the magnet The magnetic detection elements are arranged in a state of being arranged in the radial direction of the rotating shaft, and the slit is provided so as to penetrate in the radial direction.

  According to this invention, in addition to the operation of the invention described in claim 1, when one of the magnetic body and the magnetic detection element rotates with respect to the other, the magnetic field detected by the magnetic detection element at that time matches the rotation. The strength changes linearly. For this reason, when one of the magnetic body and the magnetic detection element rotates with respect to the other, the output signal output by the magnetic detection element is output with a linear output change in accordance with this rotation. Accordingly, since the rotational position between the magnetic body and the magnetic detection element can be calculated by an arithmetic expression of a linear function, the rotational position of an object that rotates with respect to the other can be calculated with a simple calculation program. In addition, since the magnet, the magnetic body, and the magnetic detection element are aligned in the radial direction of the rotation shaft, the magnetic detection device is downsized in the rotation axis direction.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, one of the magnetic body and the magnetic detection element is rotatable with respect to the other, the magnetic body is formed of a rotating plate, and the magnet The magnetic detection elements are arranged in a state of being aligned in the axial direction of the rotation shaft, and the slit is provided so as to penetrate in the axial direction.

  According to this invention, in addition to the operation of the invention described in claim 1, when one of the magnetic body and the magnetic detection element rotates with respect to the other, the magnetic field detected by the magnetic detection element at that time matches the rotation. The strength changes linearly. For this reason, when one of the magnetic body and the magnetic detection element rotates with respect to the other, the output signal output by the magnetic detection element is output with a linear output change in accordance with this rotation. Accordingly, since the rotational position between the magnetic body and the magnetic detection element can be calculated by an arithmetic expression of a linear function, the rotational position of an object that rotates with respect to the other can be calculated with a simple calculation program. Further, since the magnet, the magnetic body, and the magnetic detection element are arranged in the axial direction of the rotation shaft, the magnetic detection device is downsized in the radial direction of the rotation shaft.

  In invention of Claim 5, in the invention as described in any one of Claims 1-4, the said slit has comprised the shape from which the slit width changes continuously along the said moving direction. This is the gist.

  According to this invention, in addition to the action of the invention according to any one of claims 1 to 4, if the slit width has a continuously changing shape, the magnetic field change detected by the magnetic detection element is also increased. Since it is likely to be in a continuously changing state, a linear magnetic field change is easily obtained.

The gist of the invention according to claim 6 is that, in the invention according to any one of claims 1 to 5, the slit has a symmetrical shape along the moving direction.
According to this invention, in addition to the action of the invention according to any one of claims 1 to 5, if the slit has a symmetric shape along the moving direction, the magnetic body is used in a state that does not relate to the front and back. It becomes possible to do. Therefore, when assembling the magnetic body, it is not necessary to care about the front and back of the magnetic body, and the assembling work can be simplified.

  According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, the magnetic detection element is arranged on the fixed component among the position detection component and the fixed component that supports the position detection component in a movable state. The gist is that the magnet and the magnetic body are attached to the position detection component.

  According to this invention, in addition to the operation of the invention according to any one of claims 1 to 6, when the position detection component is moved with respect to the fixed component, the magnet and the magnetic body are moved relative to the magnetic detection element. The magnetic detection element detects a magnetic field corresponding to the positional relationship. Here, the magnetic detection element is mounted on the substrate. For example, if the magnetic detection element is attached to the position detection component, the substrate also moves with the operation of the position detection component, which is not preferable as an apparatus. However, in this example, since the magnetic detection element, that is, the substrate is attached to the fixed component, there is no concern as described above, and the reliability as the apparatus is ensured.

  According to the present invention, a linear magnetic field change can be obtained with a simple structure.

(First embodiment)
Hereinafter, a first embodiment of a magnetic detection device embodying the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic perspective view showing a schematic configuration of the magnetic detection device 1, and FIG. 2 is a schematic side view and a schematic plan view showing a schematic configuration of the magnetic detection device 1. The magnetic detection device 1 is used for, for example, a neutral start switch (NSS) of a vehicle, and more specifically, a detection for detecting an operation position of a shift lever (position detection component: not shown) operated when a gear position of an automatic transmission is changed. Device.

  The magnetic detection device 1 includes a magnet 2 magnetized in one direction, a magnetic body 3 capable of shielding the magnetic flux of the magnet 2, and a magnetic detection element 4 capable of detecting the magnetic field of the magnet 2. The magnet 2 and the magnetic body 3 are attached to a shift lever, and one magnetic detection element 4 is attached to a vehicle body (fixed part). Therefore, when the shift lever is operated, the shift operation of the shift lever is converted into a linear motion of the magnet 2 and the magnetic body 3 via a mechanical transmission mechanism (not shown), and the magnet 2 and the magnetic body 3 are detected by magnetism. It moves linearly parallel to the element 4.

  The magnet 2 is made of, for example, neodymium sintered, and is magnetized in a direction orthogonal to the magnetic body 3 (+ Z axis direction shown in FIG. 1), so that the + Z axis direction becomes the magnetization direction M. Yes. The surface of the magnet 2 facing the magnetic body 3 (upper XY plane shown in FIG. 1) is an N-pole magnetized surface 2a, and the opposite face of the magnetic body 3 (lower XY plane shown in FIG. 1) is. It becomes the magnetization surface 2b of the south pole.

  The magnetic body 3 is made of, for example, iron oxide, chromium oxide, cobalt, ferrite or the like, and has a plate shape. The magnetic body 3 takes a plate shape and is in a state orthogonal (perpendicular) to the magnetization direction M of the magnet 2. The magnetic bodies 3 are arranged between the magnet 2 and the magnetic detection element 4 with a predetermined interval. Since the magnet 2 and the magnetic body 3 are fixed to the shift lever, the magnet 2 and the magnetic body 3 can reciprocate in the linear movement direction N (in this example, the X-axis direction) according to the operation of the shift lever.

  The magnetic body 3 is provided with a slit 5 through which the magnetic flux B of the magnet 2 passes to the magnetic detection element 4 side. The slit 5 has such a shape that the magnetic field (magnetic field) detected by the magnetic detection element 4 when the shift lever is operated takes a linear (linear) magnetic field change (magnetic field change). That is, the slit 5 has a slit width that continuously changes along the + X-axis direction and has a bilaterally symmetric shape with the movement path of the magnetic body 3 as a central axis, and specifically, along the + X-axis direction. The slit width W (see FIG. 2) is tapered (flat trapezoidal shape).

  Thus, the reason why the magnetic field detected by the magnetic detection element 4 changes linearly is that the amount of the magnetic flux B shielded by the magnetic body 3 is changed by the slit 5. Moreover, if this slit 5 length L (refer FIG. 2) is lengthened, a linear area | region will be taken correspondingly and the movable range of a shift lever will become wide. Furthermore, if the slit width W is increased, the gradient of the magnetic field change (that is, the gradient α of the magnetic flux density waveform shown in FIG. 3) increases accordingly, and the resolution is increased when detecting the position of the shift lever.

  The magnetic detection element 4 is an element using, for example, a Hall element or a GMR element, and a plane (YZ plane shown in FIG. 1) parallel to the magnetization direction M of the magnet 2 is a magnetosensitive surface 4a. The magnetic detection element 4 detects the magnetic flux B that has passed through the slit 5, and detects the magnetic flux B in the Z-axis direction among the magnetic flux B generated by the magnet 2 because the magnetosensitive surface 4 a is the YZ plane. The magnetic sensing surface 4a of the magnetic detection element 4 is not limited to the YZ plane, and the XZ plane may be the magnetic sensing surface. The magnetic detection element 4 outputs an output signal (output value) Sout with a value corresponding to the magnetic field to be detected, and when the detected magnetic field at the time of linear movement takes a linear change, the magnetic detection element 4 is accompanied by the movement of the magnet 2 and the magnetic body 3. 3 outputs a linear output signal Sout.

  The state shown by the solid line in FIGS. 1 and 2 is the parking position of the shift lever, and the shift operation is performed from this state to the drive position, and the magnet 2 and the magnetic body 3 are moved in the + X-axis direction as shown by the broken line. Suppose you move. At this time, since the slits 5 are formed in the magnetic body 3, the magnetic field detected by the magnetic detection element 4 takes a linear change. Therefore, as shown in FIG. 3, the magnetic detection element 4 has a linear value according to the relative position between the magnetic body 3 and the magnetic detection element 4 (the movement position P of the magnetic body 3), that is, the operation position of the shift lever. The output signal Sout that changes to is output.

  Here, the formation of the slit 5 in the magnetic body 3 can be easily formed by punching, for example. Accordingly, the structure in which the magnetic field change detected by the magnetic detection element 4 takes a linear change can be a simple structure in which the slit 5 having a substantially trapezoidal cross section in the magnetic body 3 is formed. A magnetic field change can be obtained. Further, since the output signal Sout of the magnetic detection element 4 is linear, the shift lever position can be calculated by a linear function, and the shift lever position can be calculated by a simple program.

According to the configuration of the first embodiment, the following effects can be obtained.
(1) Since the magnetic body 3 has a simple structure in which the slit 5 having a substantially trapezoidal cross section is formed, the magnetic field change detected by the magnetic detection element 4 can be made linear. A linear magnetic field change can be obtained.

  (2) The fact that the slit 5 has a substantially trapezoidal cross section means that the slit 5 has a shape in which the slit width W continuously changes along the X-axis direction (linear movement direction N). Accordingly, since the magnetic field change detected by the magnetic detection element 4 is likely to change continuously, it is easy to obtain a linear magnetic field change.

  (3) The slit 5 has a symmetrical shape with the moving path of the magnetic body 3 as a central axis. Therefore, the magnetic body 3 can be used in a state where there is no relation between the front and back sides, and when the magnetic body 3 is assembled to the shift lever, there is no need to worry about the front and back, and the assembling work can be simplified.

  (4) The magnet 2 and the magnetic body 3 are attached to the shift lever, and the magnetic detection element 4 is attached to the vehicle body. Here, since the magnetic detection element 4 is mounted on the substrate, attaching the magnetic detection element 4 to the vehicle body means that the shift lever position detection substrate is disposed on the vehicle body side. Therefore, for example, if the magnetic detection element 4 is positioned on the shift lever side, the substrate moves with the operation of the shift lever, which is not preferable. However, in this example, the magnetic detection element 4, that is, the substrate is fixed to the vehicle body side. Thus, the substrate does not move when the shift lever is operated, and the reliability of the apparatus is increased.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. The present embodiment is different from the previous embodiment in that the rotation angle θ of the article is detected, and the other basic structure is the same. Therefore, the same parts are denoted by the same reference numerals, detailed description thereof is omitted, and only different parts will be described.

  4 is a schematic perspective view showing a schematic configuration of the magnetic detection device 1, FIG. 5 is a side sectional view of the magnetic detection device 1, and FIG. 6 is a sectional view taken along line II-II in FIG. As shown in FIG. 5, a stator 11 having a hollow shape and having an insertion hole 11a at the center is fixed to the vehicle body. The stator 11 includes a main body portion 12 having an accommodation recess 12 a that can accommodate various components of the magnetic detection device 1, and a lid portion 13 that covers the accommodation recess 12 a of the main body portion 12.

  A rotor 15 is attached to the stator 11 through a sliding member 14 such as a bearing so as to be rotatable. The rotor 15 is attached in a state of being inserted through the insertion hole 11a of the stator 11, and is connected to the shift lever. Therefore, when the shift lever is shifted, the rotor 15 rotates in the direction indicated by the arrow in FIG. 4 and FIG. 6 (hereinafter referred to as the rotation direction R). On the outer peripheral surface of the rotor 15, two locking protrusions 15 a and 15 b protruding outward in the radial direction of the rotor 15 are formed across the entire circumferential direction of the rotor 15. These locking projections 15a and 15b function as a retaining stopper for the rotor 15 from the stator 11, and the locking projection 15a on the lid 13 side has a larger diameter than the other locking projection 15b. Is formed. The sliding member 14 is interposed between the inner surface of the lid portion 13 and the locking projection 15a.

  A magnetic body 3 having a C-shaped cross section is attached to the tip of the locking projection 15 a of the rotor 15. The magnetic body 3 is disposed on the same axis as the rotor 15, and rotates in the same direction and at the same angle following the rotation when the rotor 15 rotates. The shape of the magnetic body 3 may be, for example, a ring shape (annular) other than the C-shaped cross section, and the shape is not particularly limited as long as it has a curved shape.

  A magnet 2 that generates a magnetic field in a predetermined range and strength and a magnetic detection element 4 that detects the magnetic field of the magnet are fixed to the inner surface of the stator 11. The magnet 2 is arranged on the inner side in the radial direction of the magnetic body 3 and is magnetized in the radial direction of the rotor 15 (+ Y-axis direction shown in FIG. 4), so that the + Y-axis direction is the magnetization direction M. Accordingly, in the magnet 2, the surface facing the magnetic detection element 4 (upper XZ plane shown in FIG. 4) is an N-pole magnetized surface 2a, and the opposite surface of the magnetic detection element 4 (lower side shown in FIG. 4). XZ plane) is the south pole magnetization surface 2b.

  As shown in FIGS. 4 and 5, slits 5 are formed in the magnetic body 3 along the rotation direction R of the rotor 15 (magnetic body 3). The slit 5 is formed in a shape such that when the magnetic body 3 is rotated by a shift lever operation, the magnetic field (magnetic field) detected by the magnetic detection element 4 takes a linear (linear) magnetic field change (magnetic field change). ing. The slit 5 is provided in the radial direction of the rotor 15 so as to transmit the magnetic flux B output in the + Y-axis direction to the magnetic detection element 4 side. Moreover, the slit 5 of this example has a tapered shape in which the slit width W gradually decreases from one side to the other side as in the first embodiment.

  The magnetic detection element 4 is disposed outside the magnetic body 3 in the radial direction, and the magnetic body 3 is disposed between the magnet 2 and the magnetic detection element 4. Therefore, the magnet 2 and the magnetic detection element 4 are arranged side by side in the radial direction of the rotor 15 (in this example, the Y-axis direction). In this example, since the magnet 2 and the magnetic detection element 4 are attached to the stator 11 (ie, the fixed side) and the magnetic body 3 is attached to the rotor 15 (ie, the movable side), the shift lever is shifted. Then, the magnetic body 3 rotates with respect to the magnet 2 and the magnetic detection element 4.

  In the magnetic detection element 4, a plane parallel to the magnetization direction M of the magnet 2 is a magnetosensitive surface, and in this example, the XY plane shown in FIG. 4 is a magnetosensitive surface 4a. The magnetic sensing surface 4a of the magnetic detection element 4 is not limited to the XY plane, and may be the YZ plane because it is sufficient to detect the magnetic flux B in the + Y-axis direction. The magnetic detection element 4 outputs an output signal (output value) Sout with a value corresponding to the magnetic field detected through the slit 5. When the detected magnetic field at the time of the rotation operation changes linearly, the magnetic body 3 is rotated. The linear output signal Sout shown in FIG.

  4A is the parking position of the shift lever, and a shift operation is performed from this state to the drive position, so that the magnetic body 3 is moved relative to the magnet 2 and the magnetic detection element 4 by the arrow Ra in FIG. Suppose that it has rotated in the direction shown in FIG. At this time, since the slit 5 is formed in the magnetic body 3, the magnetic field detected by the magnetic detection element 4 through the slit 5 changes linearly according to the rotation of the magnetic body 3. Therefore, as shown in FIG. 3, the magnetic detection element 4 outputs an output signal Sout whose value changes linearly according to the rotation angle θ of the magnetic body 3, that is, the operation position of the shift lever.

  Accordingly, as a method for linearly changing the detection magnetic field of the magnetic detection element 4 during rotation of the magnetic body, a simple structure in which a tapered slit is provided in the magnetic body 3 is used, so that a linear magnetic field change is obtained with a simple structure. It becomes possible. Therefore, since the rotation angle θ of the magnetic body 3 is calculated based on the output signal Sout output from the magnetic detection element 4 in a linear change with such a structure, a simple structure can be used and a simple structure can be obtained. It is possible to calculate the rotation angle θ of the magnetic body 3, that is, the operation position of the shift lever by the calculation program.

According to the configuration of the second embodiment, the same effects as (1), (2) and (4) of the first embodiment can be obtained, and the following effects can be obtained.
(5) Even if the magnetic detection device 1 for detecting the operation position of the shift lever has a rotating structure, the rotation angle θ (operation position of the shift lever) can be calculated with a simple structure and a calculation program.

  (6) The stator 11 can be attached at any position in the axial direction of the rotor 15 as long as the attachment position to the vehicle body can be secured. Therefore, in the magnetic detection device 1 of this example, many arrangement variations in the axial direction of the rotor 15 can be taken, and restrictions on the arrangement position hardly occur.

  (7) In the magnetic detection device 1 of this example, the magnet 2, the magnetic body 3, and the magnetic detection element 4 are arranged in a state of being aligned in the radial direction of the rotor 15. Accordingly, the components of the magnetic detection device 1 do not line up in the axial direction of the rotor 15, so that the size of the magnetic detection device 1 can be kept small in the axial direction of the rotor 15.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. Note that the present embodiment is different from the second embodiment only in the detection structure of the rotation angle θ, and only different portions will be described in this example.

  7 is a side sectional view of the magnetic detection device 1, and FIG. 8 is a sectional view taken along line III-III in FIG. A magnetic body 3 that can rotate integrally with the rotor 15 is fixed to the rotor 15. The magnetic body 3 in this example is formed in a rotating plate shape, has the same axis as the rotor 15, and is housed in the housing recess 12 a of the stator 11. The magnet 2 is fixed to one inner surface (left inner surface in FIG. 7) of the stator 11, and the magnetic detection element 4 is fixed to the other inner surface (right inner surface in FIG. 7). The magnetic body 3 is disposed between the magnetic bodies 3 and 4.

  The magnet 2 is magnetized in the direction toward the magnetic body 3 (the −Z-axis direction shown in FIG. 7), so that the −Y-axis direction is the magnetization direction M. Therefore, the magnet 2 has a N-pole magnetized surface 2a on the surface facing the magnetic detection element 4 (right XY plane shown in FIG. 7), and the opposite surface (XY on the left side shown in FIG. 7). The plane) is the S-pole magnetic surface 2b.

  A slit 5 is formed in the magnetic body 3, and the slit 5 extends in the axial direction of the rotor 15 so as to transmit the magnetic flux B output in the −Z-axis direction to the magnetic detection element 4 side. In addition, the slit 5 of this example also has a tapered shape in which the slit width W gradually decreases from one to the other as in the first and second embodiments. The magnet 2 and the magnetic detection element 4 are arranged at a position facing the slit 5, and in this example, are arranged side by side in the axial center direction of the rotor 15 (in this example, the Z-axis direction). Since the surface parallel to the magnetization direction M of the magnet 2 is a magnetosensitive surface, the XZ plane shown in FIG. 7 is the magnetosensitive surface 4a in this example, but this is the YZ plane. But you can.

  Also in this example, the magnet 2 and the magnetic detection element 4 are attached to the stator 11 (that is, the fixed side), and the magnetic body 3 is attached to the rotor 15 (movable side). The magnetic body 3 rotates with respect to the magnet 2 and the magnetic detection element 4. During this rotation, the magnetic detection element 4 outputs an output signal (output value) Sout with a value corresponding to the magnetic field detected through the slit 5, and when the detected magnetic field during the rotation operation takes a linear change, Along with the rotation of the magnetic body 3, a linear output signal Sout shown in FIG.

  The state indicated by the solid line in FIG. 8 is the parking position of the shift lever, and the shift operation is performed from this state to the drive position, and the magnetic body 3 rotates in the direction of the arrow Rb in FIG. 8 with respect to the magnet 2 and the magnetic detection element 4. Suppose that the state shown by the two-dot chain line in FIG. At this time, since the magnetic field detected by the magnetic detection element 4 through the slit 5 changes linearly according to the rotation of the magnetic body 3, the magnetic detection element 4 has the magnetic body 3 as shown in FIG. An output signal Sout whose value changes linearly according to the rotation angle θ, that is, the operation position of the shift lever is output.

  Accordingly, since a linear magnetic field change can be obtained simply by forming the slit 5, the rotation angle θ (shift position) of the magnetic body 3 can be calculated with a simple calculation program while using a simple structure. It becomes possible.

  According to the configuration of the third embodiment, the same effects as (1), (2) and (4) of the first embodiment and (5) and (6) of the second embodiment can be obtained, and the following The effects described in (1) can be obtained.

  (8) In the magnetic detection device 1 of this example, the magnet 2, the magnetic body 3, and the magnetic detection element 4 are arranged in a state of being aligned in the axial direction of the rotor 15. Therefore, since the components of the magnetic detection device 1 are not arranged in the radial direction of the rotor 15, the size of the magnetic detection device 1 can be reduced in the radial direction of the rotor 15.

The embodiment is not limited to the above configuration, and may be changed to the following modes.
In the first embodiment, the magnetosensitive surface 4a of the magnetic detection element 4 is not limited to the YZ plane or the XZ plane, and the surface facing the magnet 2, that is, the XY plane may be the magnetosensitive surface. This is also true for both the second and third embodiments.

  -In 1st-3rd embodiment, the shape of the slit 5 is not limited to a flat cross-section substantially trapezoid shape. For example, as shown to Fig.9 (a), the shape which curves so that the side wall of the slit 5 may draw a curved surface may be sufficient. Further, as shown in FIG. 9B, the side wall of the slit 5 may have a stepped shape, that is, a shape in which the slit width W changes discontinuously.

  -In 1st Embodiment, it is not limited to fixing the magnet 2 and the magnetic body 3 to a shift lever, and fixing the magnetic detection element 4 to a vehicle body. For example, the magnetic body 3 may be fixed to the shift lever, and the magnet 2 and the magnetic detection element 4 may be fixed to the vehicle body so that only the magnetic body 3 moves relative to the magnet 2 and the magnetic detection element 4. In this case, since only the magnetic body 3 is fixed to the shift lever, the weight applied to the shift lever is reduced, and the shift lever can be operated with a light force. Further, the magnetic detection element 4 is fixed to the shift lever, and the magnet 2 and the magnetic body 3 are fixed to the vehicle body, or the magnet 2 and the magnetic detection element 4 are fixed to the shift lever, and the magnetic body 3 is fixed to the vehicle body. A method may be adopted.

  -In 2nd and 3rd embodiment, it is not limited to the combination which fixes the magnet 2 and the magnetic detection element 4 to the stator 11, and fixes the magnetic body 3 to the rotor 15. FIG. For example, the magnetic body 3 may be fixed to the stator 11, and the magnet 2 and the magnetic detection element 4 may be fixed to the rotor 15. The magnet 2 and the magnetic detection element 4 are not necessarily fixed to the same member. For example, a combination in which the magnetic detection element 4 is fixed to the stator 11 and the magnet 2 and the magnetic body 3 are fixed to the rotor 15 may be used. .

In the first embodiment, the magnetic body 3 is not limited to a plate shape, and may be, for example, a block shape or a columnar shape.
In the first to third embodiments, the magnet 2 is not limited to having the N pole on the side facing the magnetic body 3 and the S pole on the opposite side, and the N pole and the S pole The reverse is also possible.

  -In 1st-3rd embodiment, the magnetic detection apparatus 1 is not limited to being employ | adopted as a neutral start switch (inhibitor switch), For example, the operation amount detection of a brake pedal, the operation amount detection of an accelerator pedal, rotation of a steering wheel You may employ | adopt for an angle detection, the throttle opening detection of a motor, etc.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) In any one of Claims 1-6, the said magnet and the said magnetic detection element are attached to the said fixed component among the position detection components and the fixed components which support it in a movable state, The said position detection components The magnetic body is attached to the body.

  (2) In any one of Claims 1-7, the said slit is formed in the taper shape along the said moving direction.

1 is a schematic perspective view illustrating a schematic configuration of a magnetic detection device according to a first embodiment. The schematic side view and schematic plan view which show schematic structure of a magnetic detection apparatus. The wave form diagram of the output signal which a magnetic detection element outputs. (A), (b) is a schematic perspective view of the magnetic detection apparatus in 2nd Embodiment. FIG. 3 is a side sectional view showing a schematic configuration of a magnetic detection device. II-II sectional view taken on the line of FIG. The sectional side view which shows schematic structure of the magnetic detection apparatus in 3rd Embodiment. III-III sectional view taken on the line of FIG. (A), (b) is a top view of the magnetic body in another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Magnetic detection apparatus, 2 ... Magnet, 3 ... Magnetic body, 4 ... Magnetic detection element, 4a ... Magnetic sensitive surface, 5 ... Slit, M ... Magnetization direction, N ... Linear moving direction as a moving direction, R ... Moving direction Rotation direction as W, slit width, Sout, output signal.

Claims (7)

A magnet magnetized in one direction, a magnetic sensing element that outputs an output signal in accordance with the magnetic field strength of the magnet detected by the magnetic sensing surface, the magnetic sensing surface being the magnetization direction of the magnet, and the magnet And a magnetic body disposed between the magnetic detection elements,
One of the magnetic body and the magnetic detection element is movable with respect to the other, slits having different widths along the moving direction are formed in the magnetic body, and one of the magnetic body and the magnetic detection element is the other The magnetic detection device outputs the output signal by detecting the magnetic field of the magnet through the slit when the magnetic detection element moves.   One of the magnetic body and the magnetic detection element is linearly movable with respect to the other, the magnet and the magnetic detection element are arranged in a direction perpendicular to the linear movement direction, and the slit is orthogonal The magnetic detection device according to claim 1, wherein the magnetic detection device is provided so as to extend in a direction in which the magnetic detection is performed.   One of the magnetic body and the magnetic detection element is rotatable with respect to the other, the magnetic body is formed in a curved shape, and the magnet and the magnetic detection element are arranged in a state of being aligned in the radial direction of the rotation axis. The magnetic detection device according to claim 1, wherein the slit is provided in the radial direction.   One of the magnetic body and the magnetic detection element is rotatable with respect to the other, the magnetic body is formed of a rotating plate, and the magnet and the magnetic detection element are aligned in the axial direction of the rotation axis. The magnetic detection device according to claim 1, wherein the magnetic detection device is arranged, and the slit is provided so as to penetrate in the axial direction.   The magnetic detection device according to any one of claims 1 to 4, wherein the slit has a shape in which the slit width continuously changes along the moving direction.   The magnetic detection device according to claim 1, wherein the slit has a symmetrical shape along the moving direction.   Of the position detection component and the fixed component that supports the position detection component, the magnetic detection element is attached to the fixed component, and the magnet and the magnetic body are attached to the position detection component. The magnetic detection apparatus as described in any one of Claims 1-6.

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