JP2014092419A - Position detection sensor and position detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high detection accuracy position detection sensor and position detector.SOLUTION: The position detection sensor includes: a core 11; a detection coil 12; and a shielding member 13. The core 11 has at least a pair of extension parts 14 and 15 opposing to each other and a connecting part 16. Each end of the pair of extension parts 14 and 15 is an open end 17, 18 separated from each other. The shielding member 13 is disposed at a position closer to the open ends 17 and 18 of the extension parts 14 and 15 than the detection coil 12 excluding at least a part of opposing faces 14A and 15A of the pair of extension parts 14 and 15. A detection object 9 is inserted between the opposing faces 14A and 15A. Since the position detection sensor can shut off uneven leakage magnetic flux, even when the detection object 9 is out of alignment with the position detection sensor 10, an output error can be reduced, and thus, the detection accuracy is increased.

Description

  The present invention relates to a position detection sensor and a position detection device that detect a rotation amount, a rotation angle, a movement amount, and the like of a detected object.

  A conventional position detection sensor 1 shown in FIG. 24 includes a core 2 and a detection coil 3 wound around the core 2.

  The core 2 has a pair of extending portions 4 and 5 that face each other, and a connecting portion 6 that connects one ends of these extending portions 4 and 5.

  The other end of each of the extending portions 4 and 5 is an open end and is disposed to face the detected object 7.

  The inductance of the detection coil 3 varies depending on the distance l between the open end of the core 2 and the object 7 to be detected and the facing area. By detecting this inductance change, the position of the detected object 7 can be detected.

  The following patent documents 1 and 2 are mentioned as an example approximate to said prior art.

Special table 2007-501509 gazette JP-A-1-245101

  If the detected object 7 or the position detection sensor 1 is displaced due to mounting variation, external vibration, or the like, the detection accuracy of the position detection sensor 1 may be lowered.

  The reason will be described below.

  That is, non-uniform leakage magnetic flux is generated from the open ends of the extending portions 4 and 5 of the detection coil 3. In the region where the nonuniform leakage magnetic flux is generated, the magnetic flux density varies depending on the position. Therefore, the inductance of the detection coil 3 may change even if the position detection sensor 1 or the detected object 7 is slightly displaced. Even a signal due to a positional deviation is detected as a signal due to a change in the position of the original object 7 to be detected, and as a result, the detection accuracy decreases.

  Therefore, an object of the present invention is to improve detection accuracy even when a position detection sensor or a detected object is displaced.

  In order to achieve this object, a position detection sensor according to the present invention includes a core, a detection coil wound around the core, and a conductive shield material disposed around the core, and the core is at least opposed to the core. A pair of extending portions, and a connecting portion for connecting the extending portions, each one end of the pair of extending portions is an open end portion separated from each other, and the shielding material is a pair of extending portions Is arranged at a position closer to the open end of the extending portion than the detection coil, except for at least a part of each of the opposing surfaces facing each other, and the detected object is inserted between the opposing surfaces of the pair of extending portions. .

  The position detection apparatus of the present invention includes the position detection sensor of the present invention and a detected object.

  Accordingly, the present invention can improve the detection accuracy even when the position detection sensor or the detected object is displaced.

  The reason is that non-uniform leakage magnetic flux can be shielded. Since the detected object is inserted in a region where a relatively uniform parallel magnetic flux is generated, even if the detected object and the position detection sensor are displaced, the change in inductance of the detection coil can be suppressed.

  As a result, the detection accuracy of the position detection sensor can be increased.

Sectional drawing of the position detection apparatus in Embodiment 1 Front view of the position detection device of FIG. The perspective view of the position detection apparatus in Embodiment 1 Sectional drawing of the position detection apparatus of another example in Embodiment 1 Front view of the position detection device of FIG. Sectional drawing of the position detection apparatus of another example in Embodiment 1 Front view of the position detection device of FIG. (A) Cross-sectional view of the position detection device in the second embodiment, (B) Perspective view of the position detection device in the second embodiment. Sectional drawing of the position detection apparatus in Embodiment 3 Sectional drawing of the position detection apparatus of another example in Embodiment 3 Sectional drawing of the position detection apparatus in Embodiment 4 Sectional drawing of the position detection apparatus in Embodiment 5 Sectional drawing of the position detection apparatus of another example in Embodiment 5 Sectional drawing of the position detection apparatus of another example in Embodiment 5 Sectional drawing of the position detection apparatus of another example in Embodiment 5 Sectional drawing of the position detection apparatus of another example in one embodiment of this invention Sectional drawing of the position detection apparatus of another example in one embodiment of this invention Sectional drawing of the position detection apparatus of another example in one embodiment of this invention Sectional drawing of the position detection apparatus of another example in one embodiment of this invention Sectional drawing of the position detection apparatus of another example in one embodiment of this invention Sectional drawing of the position detection apparatus of another example in one embodiment of this invention Sectional view of a position detection device of a comparative example 22 is a front view of the position detection device of FIG. Top view of a conventional position detector

(Embodiment 1)
In the first embodiment, a position detection sensor and a position detection device that are used in, for example, an in-vehicle transmission and detect gear switching will be described as an example.

  As shown in FIGS. 1 and 2, the position detection device 8 according to the present embodiment includes a detected object 9 and a position detection sensor 10.

  The position detection sensor 10 includes a core 11 having a central axis C shown in FIG. 3, a detection coil 12 wound around the central axis C of the core 11, and a shield material disposed around the core 11 (FIG. 1). 2 and 13). In FIG. 3, the shielding material 13 is omitted and not shown.

  The detection coil 12 is connected to a drive circuit (not shown) and excited. Further, a change in impedance of the detection coil 12 is detected by a detection circuit (not shown) connected to the detection coil 12.

  As illustrated in FIG. 1, the core 11 includes at least a pair of extending portions 14 and 15 that face each other, and a connecting portion 16 that connects the extending portions 14 and 15. Examples of the material of the core 11 include iron, Mn—Zn ferrite, and Ni ferrite.

  In the present embodiment, one end portions of the extending portions 14 and 15 are connected by the connecting portion 16. The other ends are open ends 17 and 18 separated from each other. The connecting portion 16 may connect the centers of the extending portions 14 and 15, for example, but the volume of the magnetic gap can be increased by connecting the end portions.

  The shield material 13 is disposed at a position closer to the open ends 17 and 18 of the extending portions 14 and 15 than the detection coil 12 except for at least a part of the facing surfaces where the pair of extending portions 14 and 15 face each other. .

  In the present embodiment, the detection coil 12 is disposed in the connecting portion 16, and the shield material 13 is disposed on the outer surface excluding the facing surfaces 14 </ b> A and 15 </ b> A where the extending portions 14 and 15 face each other. In the present embodiment, the shielding material 13 is provided on the outer surfaces of the extending portions 14 and 15 on the surfaces opposite to the opposing surfaces 14A and 15A, the outer surface, and the surfaces of the open end portions 17 and 18. It was.

  A magnetic gap is formed in a region closer to the open ends 17 and 18 than the detection coil 12, and the detected object 9 is inserted. Therefore, the detection accuracy can be improved by shielding the leakage magnetic flux in the vicinity of the magnetic gap where the detected object 9 exists.

  The shield material 13 is made of a conductive material, and may be a conductive and magnetic material. In the present embodiment, the shield material 13 is brass. In addition, aluminum, copper, tin, silver or the like can be used. The shield material 13 may be mechanically joined around the core 11 or may be formed by vapor deposition or coating. Although the leakage flux can be shielded more efficiently by bringing the shield material 13 into close contact with the surface of the core 11, it may be covered with a certain interval.

  A magnetic gap is formed between the pair of extending portions 14 and 15 of the core 11. The detected object 9 is inserted into the magnetic gap. The detected object 9 is made of a conductive material such as aluminum or copper, a magnetic material such as ferrite, or a conductive and magnetic material such as iron.

  In the present embodiment, a substantially uniform parallel magnetic flux is generated in a region where the extending portions 14 and 15 face each other at the shortest distance. In addition, the parallel magnetic flux of the area | region where the extending | stretching parts 14 and 15 oppose at the shortest distance becomes the highest magnetic flux density. A slightly arc-shaped leakage magnetic flux is generated between the open ends 17 and 18. In the present embodiment, the detected object 9 moves horizontally on a plane perpendicular to the parallel magnetic flux. When the distance between the detection coil 12 and the detected object 9 and the facing area change during horizontal movement, the impedance of the detection coil 12 changes.

  Although depending on the oscillation frequency of the detection coil 12, when iron is used as the detected object 9, the conductance mainly changes due to a change in the position of the detected object 9. When the object to be detected 9 is aluminum or ferrite, although it depends on the oscillation frequency, the change in inductance can be detected along with the change in impedance.

  In the present embodiment, the conductance increases as the distance between the detection coil 12 and the detected object 9 becomes shorter or the area facing the detected object 9 increases. On the other hand, when the distance between the detection coil 12 and the detected object 9 increases, or when the area facing the detected object 9 decreases, the conductance decreases.

  By measuring the inductance change as described above, the position of the detected object 9 can be detected.

  22 and 23 show a position detection device 19 for comparison. In this position detection device 19, the shield material 13 is not disposed. Other configurations are the same as those in the first embodiment. 22 and 23, the same components as those in the first embodiment are denoted by the same reference numerals.

  In the comparative example, the magnetic flux leaks in an arc shape from the outer surface of one of the extending portions 14 and 15 toward the other outer surface. The arc-shaped leakage magnetic flux differs in density depending on the position and is not uniform. Therefore, as shown in FIG. 22, when the detected object 9 is displaced in the X direction in which the extending portions 14 and 15 extend, for example, the inductance is caused by the arc-shaped magnetic flux leaking between the open end portions 17 and 18. Change. Further, as shown in FIG. 23, when the detected object 9 is displaced in the Z direction connecting the extending portions 14 and 15, the inductance changes due to the arc-shaped magnetic flux leaking between the outer surfaces of the extending portions 14 and 15. To do.

  On the other hand, in this embodiment, since the leakage of the leakage magnetic flux between the open ends 17 and 18 and the leakage magnetic flux between the outer surfaces can be suppressed by the shield member 13 shown in FIGS. Only affected by uniform parallel magnetic flux. Therefore, for example, as shown in FIG. 1, even if the extension portions 14 and 15 are displaced in the X direction in which they extend, they move only in a uniform parallel magnetic flux region, and the output error can be reduced.

  Further, in the present embodiment, since the detected object 9 is inserted between the opposing surfaces 14A and 15A where the parallel magnetic flux is generated, the position is shifted in the Z direction connecting the extending portions 14 and 15 as shown in FIG. However, in this embodiment, since the leakage magnetic flux can be further shielded, the output error can be further reduced in the Z direction.

  In addition, it is more preferable that the detected object 9 is inserted so as to have a predetermined margin dimension δ from both ends in the X direction in the region where the extending portions 14 and 15 face each other at the shortest distance as shown in FIG. . Even if the extending portions 14 and 15 are displaced in the extending X direction, the detected object 9 is inserted in the region where the uniform parallel magnetic flux is formed as long as it is within the margin dimension δ. Less likely to occur.

  1 and 2, the shielding material 13 is disposed on almost the entire outer surface of the open ends 17 and 18. However, as shown in FIGS. 4 and 5, for example, the open ends 17 and 18, the facing surface 14 </ b> A, You may arrange | position only to the outer surface of the extending | stretching parts 14 and 15, not arrange | positioning on the surface on the opposite side to 15A. In this case, since the leakage magnetic flux between the open end portions 17 and 18 cannot be suppressed, if the detected object 9 is displaced in the X direction in which the extending portions 14 and 15 extend, it may be affected by the leakage magnetic flux. Further, the leakage magnetic flux generated between the outer surfaces can be suppressed, and the output error can be reduced with respect to the positional deviation in the Z direction connecting the extending portions 14 and 15.

  As another example, as shown in FIGS. 6 and 7, the shield member 13 may be disposed only on the open end portions 17 and 18 without being disposed on the outer side surfaces of the extending portions 14 and 15. In this case, since the leakage magnetic flux between the outer surfaces of the extending portions 14 and 15 cannot be suppressed, if the detected object 9 is displaced in the Z direction connecting the extending portions 14 and 15, it may be affected by the leakage magnetic flux. However, the leakage magnetic flux generated between the open ends 17 and 18 can be suppressed, and the output error can be reduced with respect to the positional deviation in the X direction in which the extending portions 14 and 15 extend.

(Embodiment 2)
The main differences between the present embodiment and the first embodiment are listed below.

  First, as shown in FIG. 8A, one end of the detected object 109 protrudes outward from the open ends 17 and 18 in the X direction. That is, one end of the detected object 109 protrudes from a region where the extending portions 14 and 15 face each other at the shortest distance and the parallel magnetic flux is generated at a high density.

  In addition, as shown in FIG. 8B, the detected object 109 of the present embodiment rotates on a surface perpendicular to the parallel magnetic flux around the shaft 20 inserted into the detected object 109. In FIG. 8B, the shield material is not shown.

  As shown in FIG. 8A, the second difference is between the magnetic gaps, and the shield material is located closer to the detection coil 12 side than the open ends 17 and 18 side of the extending portions 14 and 15. 113 is arranged. In the present embodiment, the detection coil 12 is formed in the connecting portion 16, and the shield material 113 is arranged with a predetermined width from each end portion of the detection coil 12 toward the open end portions 17 and 18.

  Description of other configurations similar to those of the first embodiment is omitted.

  The effect of this embodiment will be described below.

  Here, a slight leakage magnetic flux is also generated from the detection coil 12. Therefore, in the region close to the detection coil 12, the parallel magnetic flux is affected by the leakage magnetic flux, and the magnetic flux may be uneven.

  In contrast, in the present embodiment, since the shield material 113 is disposed at a predetermined width from the detection coil 12, no parallel magnetic flux is generated from the region where the shield material 113 is disposed. Therefore, even if the detected object 109 is displaced by a predetermined distance α in the X direction, the output does not change, and the detection accuracy can be improved.

  Note that when the detected object 109 is rotated and moved as in the present embodiment, there is a gap between the insertion hole 21 of the shaft 20 provided in the detected object 109 and the shaft 20, and therefore, X due to external vibration or the like. Position misalignment is likely to occur. Therefore, by arranging the shield material 113 between the detection coil 12 and the detection area of the detected object 109 as in the present embodiment, the output error can be further reduced with respect to the positional deviation in the X direction.

  In the present embodiment, since the shielding material 13 is also disposed on the outer surface of the core 11, the surface opposite to the facing surfaces 14A and 15A, and the surfaces of the open end portions 17 and 18 as in the first embodiment, Z Although the output error can be reduced even with respect to the axial displacement, it is not arranged on these outer surfaces, but within the magnetic gap, the detection coil than the open ends 17 and 18 side of the extending portions 14 and 15. You may use only the shielding material 113 arrange | positioned in the position close | similar to 12 side. In this case, it is useful when it is particularly desired to solve the positional deviation in the X-axis direction.

(Embodiment 3)
The main difference between the present embodiment and the first embodiment is that a shield material 213 is also arranged on the outer periphery of the detection coil 12 in the magnetic gap, as shown in FIG.

  Description of other configurations similar to those of the first embodiment is omitted.

  Since the leakage magnetic flux is also generated from the detection coil 12, the leakage magnetic flux may be detected in the region close to the detection coil 12 even in the region where the extending portions 14 and 15 face each other at the shortest distance. In this embodiment, since the shielding material 213 is also arranged on the outer periphery of the detection coil 12, even if the detected object 9 is displaced in the X direction in which the extending portions 14 and 15 extend, the output error is further reduced. it can.

  Furthermore, in the present embodiment, as shown in FIG. 10, for example, the shield material 313 may be arranged with a predetermined width from the detection coil 12 toward the open ends 17 and 18. Thereby, the parallel magnetic flux in the vicinity of the detection coil 12 affected by the leakage magnetic flux of the detection coil 12 can be shielded. Therefore, the output error can be further reduced even if the detected object 209 is displaced in the X-axis direction. In particular, when the detected object 209 in FIG. 10 rotates and moves as described in the second embodiment, the positional deviation in the X direction is likely to be a problem, so the configuration in FIG. 10 is more useful.

  In the present embodiment, since the shielding material 13 is also disposed on the outer surface of the core 11, the surface opposite to the facing surfaces 14A and 15A, and the surfaces of the open end portions 17 and 18 as in the first embodiment, Z Although the output error can be reduced even with respect to the axial displacement, only the shield materials 213 and 313 disposed in the magnetic gap may be used instead of being disposed on these outer surfaces. In this case, it is useful when it is particularly desired to solve the positional deviation in the X-axis direction.

(Embodiment 4)
The main difference between the present embodiment and the first embodiment is that the detection coil 412 is wound from the connecting portion 16 to a part of the extending portions 14 and 15 as shown in FIG.

  The shield material 413 is formed on the outer surfaces of the extending portions 14 and 15 including the surfaces of the open end portions 17 and 18 except for the region where the detection coil 412 is formed. In the present embodiment, it is not necessary to arrange a shield material in the magnetic gap.

  The description of the same configuration as that in Embodiment 1 is omitted.

  In the present embodiment, the detection coil 412 is wound up to a predetermined width from the end portions of the connecting portion 16 and the extending portions 14 and 15 connected to the connecting portion 16 to the open end portions 17 and 18. Therefore, the number of turns of the detection coil 412 can be increased. Therefore, the inductance can be increased.

  Further, since the detection coil 412 is also arranged at the end portion (the root portion of the extension portions 14 and 15) connected to the connecting portion 16 of the extension portions 14 and 15, the parallel portions that are affected by the leakage magnetic flux from the detection coil 12 at the root portion. Magnetic flux is not easily generated.

  Therefore, even if the detected object 409 is displaced by a predetermined distance α in the X direction, the output does not change, and the detection accuracy can be improved.

  In the present embodiment, a shielding material may be further disposed in the magnetic gap at a position closer to the detection coil 412 side than the open ends 17 and 18 or at least one of the outer circumferences of the detection coil 412. Good.

(Embodiment 5)
The main difference between the present embodiment and the first embodiment is that the shield material 513 covers the gap between the open end portions 17 and 18, as shown in FIG.

  The description of the same configuration as that in Embodiment 1 is omitted.

  Here, in the vicinity of the boundary between the core 11 and the magnetic gap, magnetic flux leakage tends to occur, and the magnetic flux may become non-uniform. In particular, such leakage magnetic flux is likely to occur at the open ends 17 and 18, which may affect the output error due to the displacement of the detected object 9.

  On the other hand, in the present embodiment, since the shield material 513 is arranged so as to cover the gap between the open end portions 17 and 18, leakage of magnetic flux generated from the open end portions 17 and 18 can be reduced. Therefore, even if the detected object 9 is displaced in the X direction, it is difficult to detect the leakage of magnetic flux, and the output error can be reduced.

  The shield material 513 may extend in the Z direction from the open ends 17 and 18 as shown in FIG. 12, or along the surfaces of the extended portions 14 and 15 as in the shield material 613 shown in FIG. You may bend | fold to the connection part 16 side. Also in the form of FIG. 13, leakage of magnetic flux in the vicinity of the boundary with the magnetic gap of the core 11 can be reduced, and output error can be reduced.

  Further, in the present embodiment, as shown in FIG. 14, a shield material 713 may be disposed also at an end portion (root portion) connected to the connecting portion 16 of the extending portions 14 and 15 in the magnetic gap. Further, a shield material 813 may be disposed on the outer periphery of the detection coil 12. The form of FIG. 14 is particularly useful for the detected object 709 whose rotation angle is detected by the position detection sensor 710. When the detected object 709 rotates, the position of the detected object 709 is likely to be displaced in the X direction. Therefore, the output error can be efficiently reduced by the shield material 713 at the root of the extending portions 14 and 15. Further, since the leakage magnetic flux from the detection coil 12 can be reduced by the shield material 813, even if the detected object 9 is displaced in the X direction in which the extending portions 14 and 15 extend, the output error can be further reduced.

  In the present embodiment, as shown in FIG. 15, the gap between the open end portions 17 and 18 may be closed with a shield material 913. Magnetic flux leakage near the boundary of the core 11 with the magnetic gap can be further reduced, and the output error can be reduced.

  Further, in the present embodiment, the detection coil may be wound around the connecting portion and a part of the extending portion.

  In the first to fifth embodiments, the core 11 has a so-called U-shape in which the ends of the three rectangular parallelepipeds are connected to each other. However, the other connecting portion 16 may have a curved U-shape. Furthermore, a C-shaped core 1011 as shown in FIGS. 16 to 18 or an E-shaped core 1111 as shown in FIG.

  The C-shaped core 1011 as shown in FIGS. 16 to 18 includes a pair of curved extending portions 1014 and 1015 facing each other, and a connecting portion 1016 for connecting these extending portions 1014 and 1015. Yes. The connecting portion 1016 is also curved. The open end portions 1017 and 1018 are regions where the extending portions 1014 and 1015 face each other at the shortest distance.

  A detection coil 1012 is wound around a part of the core 1011. In the form shown in FIGS. 16 to 18, the detection coil 1012 is wound around the connecting portion 1016. The most dense and almost uniform parallel magnetic flux is generated between the open ends 1017 and 1018. The detected object 9 is inserted horizontally in a plane perpendicular to the parallel magnetic flux, and moves in a direction intersecting with the extending direction of the extending portions 1014 and 1015 on the horizontal surface perpendicular to the parallel magnetic flux. .

  The shield material 1013 is disposed closer to the open ends 1017 and 1018 of the extending portions 1014 and 1015 than the detection coil 1012. For example, you may form in the outer surface of the extending | stretching parts 1014 and 1015 like FIG. In this case, even when the detected object 9 is displaced in the Z direction connecting the extending portions 1014 and 1015 or when the detected object 9 is displaced in the X direction in which the extending portions 1014 and 1015 extend, the outside of the extending portions 1014 and 1015 is removed. The magnetic flux leaking in the direction can be shielded, and the output error can be suppressed.

  In addition, as shown in FIG. 17, the shield material 1113 may be formed on the curved surfaces on the opposite sides of the extending portions 1014 and 1015 in the magnetic gap. The shield material 1113 is also disposed at a position closer to the open ends 1017 and 1018 of the extending portions 1014 and 1015 than the detection coil 1012. In the magnetic gap, the extending portions 1014 and 1015 do not face each other at the shortest distance on the curved surfaces of the extending portions 1014 and 1015, and the facing distance varies depending on the position. Since the magnetic flux density varies depending on the facing distance, the object to be detected 9 can be inserted only between the open ends 1017 and 1018 that generate a uniform parallel magnetic flux by arranging the shield material 1113 on the opposing curved surfaces. Therefore, even when the position is shifted in the X direction, the non-uniform leakage magnetic flux can be shielded, and the output error can be suppressed. Moreover, since the magnetic flux leakage of the area | region where the extending | stretching parts 1014 and 1015 oppose can be reduced with the shielding material 1113, there exists an effect also in the position shift of a Z direction.

  Further, as shown in FIG. 18, the shield materials 1013 and 1113 may be arranged on both the outer surface of the extending portions 1014 and 1015 and the curved surfaces where the extending portions 1014 and 1015 face each other. The influence of leakage magnetic flux can be further suppressed, and the output error can be reduced.

  Moreover, as shown in FIG. 20, all of the shield materials (reference numeral 13 in FIG. 20) described in the first to fifth embodiments may be grounded. By grounding the shield material, the influence of the noise on the core 11 can be reduced, so that the shield material is strong against the noise.

  When the shield is grounded, connection to the circuit unit is easier than when the core 11 is grounded, and problems such as chipping due to the grounding processing of the core 11, cracks, and increased costs due to difficulty in processing can be avoided.

  Further, any of the shielding materials (reference numeral 13 in FIG. 21) described in the first to fifth embodiments may be connected to the detection coil 12 as shown in FIG.

  When the detection coil 12 is attached to the circuit board 22, the winding of the detection coil 12 may be lost. On the other hand, by connecting the shield material 13 to the circuit board 22, it is possible to suppress winding defects.

  For example, when two shield members 13 are used and both ends of the detection coil 12 are connected to the respective shield members 13, the shield member 13 can be used as a terminal. If the shielding material 13 is made of a material excellent in wettability with solder such as brass, copper, silver, tin, etc., it is easy to solder and easily attach to the circuit board, and the work process is reduced and the cost is reduced. Can do. In addition, even when a material that is difficult to solder is used as the shielding material 13, at least a part of the surface can be easily plated by tin plating, silver plating, copper plating, or the like. .

  In the present embodiment, the device to be detected used in the in-vehicle transmission is taken as an example. However, the application to be applied is not limited to this, and other devices such as a gear tooth sensor can be used.

  Since the position can be detected with high accuracy even if there is variation in the position of the detected object, it is useful for position detection devices and position detection sensors that require high-precision measurement.

8 Position detection device 9, 109, 209, 409, 709 Object to be detected 10, 710 Position detection sensor 11, 1011, 1111 Core 12, 412, 1012 Detection coil 13, 113, 213, 313, 413, 513, 613, 713 , 813, 913, 1013, 1113 Shield material 14, 1014 Extending part 14 A Opposing surface 15, 1015 Extending part 15 A Opposing surface 16, 1016 Connecting part 17, 1017 Open end part 18, 1018 Open end part 19 Position detection device 20 Shaft 21 Insertion hole 22 Circuit board

Claims (6)

The core,
A detection coil wound around the core;
A conductive shield disposed around the core, and
The core has at least a pair of extending portions facing each other, and a connecting portion that connects between these extending portions,
One end of each of the pair of extending portions is an open end portion separated from each other,
The shield material is disposed at a position closer to the open end of the extending portion than the detection coil, except for at least a part of each facing surface where the pair of extending portions are opposed to each other.
A position detection sensor in which an object to be detected is inserted between the opposing surfaces of a pair of extending portions. The shield material is
The position detection sensor according to claim 1, wherein the position detection sensor is disposed in a magnetic gap where at least a pair of the extending portions are opposed to each other and closer to the detection coil side than the open end side of the extending portion. The shield material is
The position detection sensor according to claim 1, wherein the position detection sensor is disposed at least on an outer periphery of the detection coil. The detection coil is
The position detection sensor according to claim 1, wherein the position detection sensor is wound around the connecting portion and a part of the extending portion. The shield material is
The position detection sensor according to claim 1, which covers a gap between the open end portions of the pair of extending portions. A position detection sensor, and a detected object whose position is detected by the position detection sensor,
The position detection sensor is
The core,
A detection coil wound around the core;
A conductive shield disposed around the core, and
The core has at least a pair of extending portions facing each other, and a connecting portion that connects between these extending portions,
One end of each of the pair of extending portions is an open end portion separated from each other,
The shield material is disposed at a position closer to the open end of the extending portion than the detection coil, except for at least a part of each facing surface where the pair of extending portions are opposed to each other.
A position detection device in which the detected object is inserted between the facing surfaces of a pair of extending portions.

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