WO2012081466A1

WO2012081466A1 - Rotary sensor

Info

Publication number: WO2012081466A1
Application number: PCT/JP2011/078294
Authority: WO
Inventors: 晃平佐藤; 徳浩位田
Original assignee: パナソニック株式会社
Priority date: 2010-12-13
Filing date: 2011-12-07
Publication date: 2012-06-21
Also published as: JP2012128986A; JP5816855B2

Abstract

A housing of a rotary sensor houses a detection unit, and is attached to the body of a motorcycle. A rotor formed from a conductive material is provided so as allow free rotation relative to the housing and rotates together with a stand when this rotates. A detected unit is configured with a portion of said rotor. A detection unit has a circuit substrate on which a coil comprising a planar coil is formed. The coil is driven at a high frequency by an integrated circuit mounted on the circuit substrate, and the conductance of the coil varies with the change in the distance thereof from the detected unit accompanying rotation of the rotor. The integrated circuit detects whether the stand is in an upright position or in a storage position from the change of the coil conductance.

Description

Rotary sensor

The present invention relates to a rotary sensor.

¡In order to hold the vehicle body in a standing state when the motorcycle is parked, the motorcycle is provided with a stand. If the engine is started when the stand is in the standing position (parking position), there is a risk of sudden start when the stand is retracted, so the engine will not start when the stand is in the standing position. As shown, an interlock function is provided. Therefore, as shown in FIG. 5, a rotary sensor 1 for detecting whether the stand 101 is in the upright position or in the retracted position (position during travel) is attached to the connection portion between the vehicle body 100 and the stand 101. (For example, Japanese Patent Application Publication No. 2010-228565 (hereinafter referred to as “Document 1”)).

The stand 101 is rotatably attached to the vehicle body 100 in the direction of arrow A1 by inserting a first pivot bolt (not shown) screwed to the bracket 102 of the vehicle body 100. Both ends of the coil spring 107 are engaged with the rod-like protrusion 105 provided on the bracket 102 and the protrusion 106 provided on the lower side of the stand 101, and the stand 101 is attached by the spring force of the coil spring 107. The stored state is retained.

The rotary sensor 1 disclosed in Document 1 includes a rotor (not shown) that rotates with the stand 101, a detection unit (not shown) that detects the position of the stand 101, and a vehicle body 100 that houses the detection unit. The housing 2 is fixed as a main component.

The object to be detected made of a conductive material is held on the rotor, and the position of the object to be detected held on the rotor is displaced by the rotation of the rotor.

The detection unit detects the position of the stand 101 because the bobbin through which the core is inserted, the coil wound around the bobbin, the coil is driven at a high frequency, and the conductance of the coil changes as the stand 101 rotates. A detection circuit is provided. Here, when the stand 101 is in one of the standing position and the storage position (traveling position), the rotor rotates to a position where the detected object faces the coil and is in the other of the standing position and the storage position. The rotor rotates at a position where the detected object does not face the coil. Therefore, the distance between the object to be detected and the coil made of the conductive material changes between the standing position and the retracted position of the stand 101, and the magnetic flux of the coil changes accordingly. Therefore, the conductance of the coil also changes. The detection circuit compares the conductance of the coil with a predetermined threshold value, and detects whether the stand 101 is in the standing position or the storage position from the comparison result.

By the way, when the detected body approaches or moves away from the coil, a large magnetic flux change is obtained at the tip of the coil close to the detected body. In the rotary sensor 1 disclosed in the above-mentioned document 1, there is a bobbin wrinkle between the coil and the detected body, so that the gap between the detected body and the coil is increased by the thickness of the wrinkle. There is a problem that the change in conductance becomes small and the detection sensitivity decreases. In particular, in a structure in which the detected body is provided outside the housing with respect to the coil disposed in the housing, the distance between the detected body and the tip of the coil (hereinafter referred to as “separation distance”) is at least The first clearance, the thickness of the housing facing the tip of the coil (for example, the thickness of the cover), and the thickness of the bobbin collar are included. Here, the first clearance is a distance required between the detected object and a portion of the housing (for example, a cover) facing the tip of the coil so as not to contact each other. The separation distance preferably includes the second clearance, where the second clearance is a distance required between the housing and the coil side (bobbin collar) so that they do not contact each other.

Moreover, in order to manufacture a rotary sensor, the process of insert-molding the core into the bobbin, the process of winding the coil around the bobbin, and the process of mounting the coil on the substrate of the detection circuit are required, which increases the manufacturing process. There was also a problem.

The present invention has been made in view of the above problems, and an object thereof is to provide a rotary sensor that is easy to manufacture and has improved detection sensitivity.

The rotary sensor (1) of the present invention detects whether or not the rod-shaped piece (101) configured to rotate on the pivot axis is in a predetermined position with respect to the object (10) including the rod-shaped piece (101). Configured to do. The rotary sensor (1) includes a housing (2), a rotor (4), a detected body (42), a coil (31), and a detection circuit (32). The housing (2) is attached to the main body (100) of the object (10). The rotor (4) is provided to rotate in accordance with the rotation of the rod-shaped piece (101). The detected body (42) is made of a conductive material and is held by either the housing (2) or the rotor (4). The coil (31) is provided so as to generate a conductance corresponding to the distance from the detected object (42) that changes as the rotor (4) rotates. The detection circuit (32) is configured to detect whether or not the rod-shaped piece (101) is in a predetermined position from the conductance of the coil (31). The coil (31) is a planar coil formed on the substrate (30).

In one embodiment, the object is a motorcycle, and the body of the object is a body (100) of the motorcycle. The rod-shaped piece is a stand (101) of the motorcycle for holding the vehicle body in an upright state. The predetermined position is a storage position of the stand (101).

In one embodiment, the circuit component of the detection circuit (32) is mounted on the substrate (30) on a surface opposite to the surface on the detected object (42) side.

In one embodiment, the rotor (4) includes the detected body (42). The housing (2) is configured so that the rotor (4) is interposed between the housing (2) and the body (100) of the object (10) and rotates together with the rod-shaped piece (101). It is attached to the main body (100) of (10). When the rod-shaped piece (101) is in the predetermined position, the substrate (30) has a part (2b) of the housing (2) partially or entirely of the tip surface (31a) of the coil (31). And placed in the housing (2) so as to face the detected body (42). When the rod-like piece (101) is in the predetermined position, the separation distance (D) between the detected body (42) and the tip surface (31a) of the coil (31) is the same as that of the coil (31). In addition to the thickness (T) of the part (2b) of the housing (2) facing the tip surface (31a), only the clearance (C1, or C1 and C2) as a spatial distance is included.

In one embodiment, the clearance includes only the first clearance (C1), which is the housing (2) facing the detected body (42) and the tip surface (31a) of the coil (31). It is the spatial distance provided between them so that a part (2b) may not contact each other.

In one embodiment, the clearance includes only the first clearance (C1) and the second clearance (C2). The first clearance (C1) prevents the detected body (42) and a part (2b) of the housing (2) facing the tip surface (31a) of the coil (31) from contacting each other. , The spatial distance provided between them. The second clearance (C2) is a spatial distance provided between a part (2b) of the housing (2) and a tip surface (31a) of the coil (31) so as not to contact each other. .

In one embodiment, the housing (2) includes a body (2a) having a recess (20) in which the substrate (30) is placed, and the body (2a) so as to close the recess (20). And a cover (2b) to be attached to. The substrate (30) has a first surface on which the detection circuit (32) is mounted and the coil (31) so that a tip surface (31a) of the coil (31) faces the cover (2b). And a second surface to be mounted. The cover (2b) corresponds to a part of the housing (2), and the thickness (T) of the cover (2b) is a part of the housing (2) facing the tip surface (31a) of the coil (31). Corresponds to the thickness of the part.

According to the present invention, it is possible to provide a rotary sensor that is easy to manufacture and has improved detection sensitivity.

Preferred embodiments of the invention are described in further detail. Other features and advantages of the present invention will be better understood with reference to the following detailed description and accompanying drawings.
It is a disassembled perspective view of the rotary sensor of this embodiment. 2A is a cross-sectional view of the above rotary sensor, and FIG. 2B is a partially enlarged view of FIG. 2A. 3A and 3B are explanatory views for explaining the rotational position of the rotary sensor. It is a figure explaining the relationship between the rotation angle of a rotary sensor same as the above, and conductance. It is a perspective view of the principal part which shows the use condition of a rotary sensor.

The rotary sensor according to this embodiment will be described with reference to FIGS.

1 is an exploded perspective view of the rotary sensor 1, FIG. 2 is a cross-sectional view of the rotary sensor 1, and FIG. 5 is a perspective view for explaining a use state of the rotary sensor 1. The rotary sensor 1 is configured to detect whether or not a rod-shaped piece configured to rotate on a turning shaft is in a predetermined position with respect to an object including the rod-shaped piece. 1 to 5, the object is a two-wheeled vehicle 10, and the main body of the object is a vehicle body 100 of the two-wheeled vehicle 10. The rod-shaped piece is a stand 101 of the two-wheeled vehicle 10 for holding the vehicle body 100 in an upright state, and a base end (specifically, a hole in the base end) of the stand 101 is interposed via a first pivot bolt 104 as a turning shaft. It is supported by the vehicle body 100 (specifically, the bracket 102). The object of the present invention is not limited to a motorcycle. For example, the object of the present invention may be a crossing barrier having a bar or pole as a bar-shaped piece.

In the present embodiment, the rotary sensor 1 is attached to the vehicle body 100 of the two-wheeled vehicle 10 and configured to detect, for example, whether the stand 101 that holds the vehicle body 100 in an upright state during parking is in the upright state or in the retracted state. Is done. In FIG. 2A, the bracket 102 of the vehicle body 100 to which the stand 101 is fixed is not shown. 2A is the axial direction of the turning shaft (first pivot bolt 104), and the rotary sensor 1 is arranged on the first side (left side shown in FIG. 2A) in the axial direction with respect to the vehicle body 100. The

The rotary sensor 1 includes a detection unit 3, a housing 2 that houses the detection unit 3, and a rotor 4 as main components. The housing 2 and the rotor 4 are attached to the vehicle body 100 (specifically, the first pivot bolt 104) of the two-wheeled vehicle 10 using the second pivot bolt 5.

The second pivot bolt 5 is a stepped bolt, and the distal end side of the shaft portion 51 of the second pivot bolt 5 has a small diameter, and a screw portion 51a is provided in the small diameter portion. In addition, a disc-shaped head portion 52 that protrudes in the radial direction is integrally provided on the proximal end side of the shaft portion 51.

The detection unit 3 includes a circuit board 30 made of a flat annular printed wiring board. The circuit board 30 is accommodated in the housing 2 with the thickness direction of the circuit board 30 as the axial direction (left-right direction in FIG. 2A). A hole 30a is opened at the center of the circuit board 30, and a coil 31 made of a planar coil and a one-chip integrated circuit 32 constituting the detection circuit are mounted diagonally across the hole 30a. Yes. Here, coil-shaped conductive patterns are respectively formed on the front surface (first surface) and the back surface (second surface) of the circuit board 30, and the conductive patterns on the front surface and the back surface are made conductive by through holes or the like. One coil 31 is formed. The integrated circuit 32 is mounted on the surface (first surface) of the circuit board 30. In the example of FIG. 2A, the integrated circuit 32 is mounted on the surface (left surface of FIG. 2A) opposite to the surface (right surface of FIG. 2A) on the circuit board 30, which will be described later. The integrated circuit 32 constitutes a detection circuit for flowing a high-frequency current through the coil 31 and detecting whether or not the stand 101 is in the retracted position from the result of comparing the conductance of the coil 31 with a predetermined threshold value. Has been. As will be described in detail later, the rotor 4 is made of a conductive material, and the detected portion 42 is configured by a part of the rotor 4, and the position of the rotor 4 depends on whether the stand 101 is in the standing position or the retracted position. The distance between the detected part 42 and the coil 31 changes accordingly. Therefore, the conductance of the coil 31 changes according to the position of the stand 101 (standing position or retracted position), and the detection circuit detects whether the stand 101 is in the standing position or retracted position from the change in conductance. And output to the outside. Since such a detection circuit can be realized by a known technique, detailed illustration and description are omitted.

The housing 2 is configured by connecting a body 2a and a cover 2b, each formed of an insulating synthetic resin, and stores the above-described detection unit 3 in an internal storage space (recess) 20.

The body 2 a has a cylindrical shape as a whole, and includes a main body 21 provided with a storage space 20. The second end side (right side in FIG. 2A) of the main body 21 on the second side in the axial direction is substantially entirely open, and the first end side (left side in FIG. 2A) of the main body 21 on the first side in the axial direction. A recess 24 is provided on the outer surface of the bottom wall that closes the cover. The recessed portion 24 is recessed in a round hole shape having a diameter larger than that of the head portion 52 of the second pivot bolt 5, and a bearing hole 24 a into which the shaft portion 51 of the second pivot bolt 5 is inserted at the center of the recessed portion 24. Is provided (see FIG. 2A). Further, the inner surface of the bottom wall of the body 2a has a cylindrical shape surrounding the shaft portion 51 of the second pivot bolt 5. The inner peripheral surface constitutes the inner peripheral surface of the bearing hole 24a, and the outer peripheral surface is the storage space. The cylindrical convex part 25 which comprises the inner surface of 20 is provided in the form which protrudes to the 2nd side of an axial direction, ie, the right direction (opening side).

Further, on the outer peripheral surface of the main body portion 21, an electric wire lead-out portion 22 for leading an electric wire (C) composed of a plurality of core wires from the storage space 20 to the outside is provided so as to protrude in the radial direction. Further, on the outer peripheral surface of the main body portion 21, a projecting portion 23 projecting in the radial direction is provided with a gap between the projecting portion 23 and the wire leading portion 22. The rotation of the housing 2 with respect to the vehicle body 100 is restricted by sandwiching 105.

The cover 2b is formed in a disc shape, and a round hole 26 into which the tip of the cylindrical convex portion 25 fits is formed at the center of the cover 2b.

Inside the body 2a, the circuit board 30 has the mounting surface of the integrated circuit 32 facing the bottom wall (on the side opposite to the rotor 4 in the mounted state), and the cylindrical convex portion 25 is passed through the central hole 30a. It is stored in. A stepped portion 27 that abuts on the left surface (first surface) of the circuit board 30 is provided on the outer peripheral surface of the cylindrical convex portion 25 and the inner side surface of the storage space 20, respectively. The detection unit 3 is fixed to the body 2a by, for example, heat welding to 2a.

When the cover 2b is inserted into the body 2a from the opening of the body 2a in a state where the circuit board 30 is housed in the body 2a, the circuit board 30 (the detection unit 3) is held between the body 2a and the cover 2b. . On the outer peripheral surface of the cylindrical convex portion 25 and the inner side surface of the storage space 20, a step portion 28 that abuts on the left surface (first surface) of the cover 2b is provided, and the left surface of the cover 2b is provided on the step portion 28. When the (first surface) abuts, the cover 2b is positioned in the left-right direction (axial direction) with respect to the body 2a. And the storage space 20 inside the housing 2 is sealed by welding the contact part of the body 2a and the cover 2b by laser welding, for example. Here, the right end surface (tip surface) of the cylindrical convex portion 25 protrudes to the right (second side in the axial direction) rather than the right surface (second surface) of the cover 2 b and is in contact with the rotor 4. Accordingly, the rotor 4 rotates while its surface (first surface) slides on the right end surface (tip surface) of the cylindrical convex portion 25, and when mounted on the vehicle body 100, In order to reduce the friction between them, grease is applied to the right end surface (tip surface) of the cylindrical convex portion 25. The circuit board 30 is electrically connected to one end of the electric wire (C) drawn out from the electric wire drawing portion 22 and the power of the integrated circuit 32 is supplied through the electric wire (C). The output of the integrated circuit 32 is output to the outside through the electric wire (C).

The rotor 4 is formed by punching and drawing a metal plate, for example, and has a flat shape in which the thickness direction is in the left-right direction (axial direction of the pivot axis), and the shaft portion of the second pivot bolt 5 It has the main-body part 41 in which the circular insertion hole 41a in which 51 is penetrated was penetrated. The rotor 4 is sandwiched between the housing 2 (cylindrical convex portion 25 provided on the body 2a) and the stand 101 (first pivot bolt 104), so that displacement in the left-right direction (axial direction) is restricted. ing. Here, the inner diameter of the insertion hole 41 a provided in the rotor 4 is larger than the outer diameter of the screw portion 51 a of the second pivot bolt 5 and smaller than the outer diameter of the large diameter portion of the shaft portion 51, The displacement of the rotor 4 in the left-right direction (axial direction) is also restricted by being sandwiched between the large diameter portion of the shaft portion 51 and the first pivot bolt 104.

The main body 41 is integrally provided with a fan-shaped detected portion 42 centered on the center position of the insertion hole 41a. Further, the main body portion 41 has an L-shaped arm that protrudes in the radial direction from the insertion hole 41a and protrudes to one end side in the thickness direction corresponding to the second side in the axial direction (the vehicle body 100 side in the attached state). The part 43 is provided integrally. The arm portion 43 is provided on the opposite side of the insertion hole 41a with respect to one string constituting the sector-shaped detected portion 42. A peripheral wall 44 that protrudes from the outer peripheral edge of the detected portion 42 to one end side in the thickness direction (the vehicle body 100 side in the attached state) is provided integrally with the detected portion 42. When the rotor 4 is screwed to the stand 101 together with the housing 2 using the second pivot bolt 5, the arm portion 43 and the peripheral wall 44 sandwich the base end portion of the stand 101 from both sides, thereby the rotor 4 with respect to the stand 101. Rotation will be restricted. Therefore, when the stand 101 rotates in the A1 direction in FIG. 5, the rotor 4 rotates together with the stand 101, so that the rotor 4 rotates relative to the housing 2.

Here, FIG. 3A shows a state in which the stand 101 has moved to the standing position, and FIG. 3B shows a state in which the stand 101 has moved to the storage position. The rotation angle of the rotor 4 when the stand 101 is in the standing position is D1, and the rotation angle of the rotor 4 when the stand 101 is in the storage position is D2.

In the example of FIG. 3, the detected portion 42 of the rotor 4 is positioned on the right side of the coil 31 in the standing state (opposite), and the detected portion 42 of the rotor 4 is positioned on the right side of the coil 31 in the retracted state. Not located (not facing). Accordingly, as the stand 101 rotates with respect to the vehicle body 100, the rotor 4 rotates relative to the housing 2, and therefore the distance between the detected portion 42 and the coil 31 mainly changes, so that the conductance of the coil 31 changes. .

The rotary sensor 1 is attached to the vehicle body 100 as follows. As shown in FIG. 1, first, the worker places the rotor 4 and the housing 2 so as to overlap each other on the right side (the head 104 a side) of the first pivot bolt 104. Then, the operator passes the second pivot bolt 5 through the bearing hole 24a of the housing 2 and the insertion hole 41a of the rotor 4 and screws it into the screw hole 104b provided in the head 104a of the first pivot bolt 104. 2 and the rotor 4 are screwed to the stand 101. An O-ring 6 made of an elastic material such as synthetic rubber is attached to the shaft portion 51 of the second pivot bolt.

As described above, the rotary sensor 1 is attached to the stand 101. However, when the rotary sensor 1 is attached to the vehicle body 100, the projection 2 is sandwiched between the wire lead-out portion 22 and the projection portion 23, so that the housing 2 with respect to the vehicle body 100 is obtained. The rotation of is regulated. On the other hand, the rotor 4 is rotatably held with respect to the housing 2, and when the stand 101 rotates between the standing position and the retracted position, the rotor 4 rotates together with the stand 101, whereby the rotor 4 moves relative to the housing 2. It is designed to rotate relatively. Here, the detected portion 42 is formed in a substantially quarter circle, and the detected portion 42 is located on the right side (axis) of the coil 31 only when the stand 101 is in one of the standing position and the retracted position. (Opposite position on the second side of the direction). Therefore, when the stand 101 is in the other position, the detected part 42 is not located on the right side of the coil 31 (opposite position on the second side in the axial direction). That is, when the rotor 4 rotates with respect to the housing 2 as the stand 101 rotates with respect to the vehicle body 100, the conductance of the coil 31 changes mainly due to a change in the distance between the detected portion 42 and the coil 31. As a result, the output of the integrated circuit 32 changes depending on whether the stand 101 is in one of the upright position and the storage position or in the other, so that the position of the stand 101 can be detected. .

Here, an annular groove 24b is formed at the opening edge of the bearing hole 24a on the bottom surface of the recess 24 into which the head portion 52 of the second pivot bolt 5 is inserted, and the O-ring 6 is disposed in the groove 24b. . The thickness dimension of the O-ring 6 when not elastically deformed is larger than the depth dimension of the groove 24b. When the second pivot bolt 5 is tightened, the O-ring 6 has a head 52 of the second pivot bolt 5. And the bottom surface of the groove 24b are elastically deformed so as to be crushed. That is, when the housing 2 is pressed against the rotor 4 by the elastic force of the O-ring 6, rattling of the housing 2 with respect to the rotor 4 (and erroneous detection associated therewith) is suppressed.

The body 2a has a cylindrical encircling portion 29 that constitutes the inner peripheral surface of the storage space 20, and the encircling portion 29 is located in the right direction (axis) rather than the right end (tip) of the cylindrical convex portion 25. Projecting to the second side of the direction). The surrounding portion 29 protrudes to the right side (second side in the axial direction) of the main body portion 41 of the rotor 4 in a state where the second pivot bolt 5 is tightened, and the axial direction of the shaft portion 51 of the second pivot bolt 5 ( The main body 41 of the rotor 4 is covered when viewed from a direction orthogonal to the (left-right direction). Thereby, it is possible to prevent foreign matter such as mud from entering between the housing 2 and the rotor 4 by the surrounding portion 29.

The rotary sensor 1 of this embodiment is configured to detect whether or not the stand 101 that holds the vehicle body 100 of the two-wheeled vehicle 10 in the standing state is in the retracted position, and includes the housing 2, the rotor 4, and the detected portion 42. (Detected body), a coil 31, and an integrated circuit 32 (detection circuit). The housing 2 is attached to the vehicle body 100. The rotor 4 is provided so as to be rotatable with respect to the housing 2 and is provided so as to rotate in accordance with the rotation of the stand 101. The detected portion 42 is made of a conductive material and is held by either the housing 2 or the rotor 4 (the rotor 4 in this embodiment). The coil 31 is a planar coil formed on the circuit board 30 and is provided so as to generate a conductance corresponding to the distance from the detected portion 42 that changes as the rotor 4 rotates. The integrated circuit 32 is configured to detect from the conductance of the coil 31 whether or not the stand 101 is in the retracted position. In this embodiment, the detected object (detected part 42) is held by the rotor 4 and the coil 31 is stored in the housing 2. However, the detected object is held on the housing 2 side, and the coil 31 is connected to the rotor 4. It may be held in.

As described above, since the coil 31 is a planar coil formed on the circuit board 30, the gap between the coil 31 and the detected part 42 is made smaller than that of a coil wound around a bobbin as in the prior art. it can.

Specifically, as shown in FIGS. 2A and 2B, the rotor 4 includes a detected portion 42. The housing 2 is attached to the vehicle body 100 such that the rotor 4 is interposed between the housing 2 and the vehicle body 100 of the two-wheeled vehicle 10 and rotates together with the stand 101. In the example of FIG. 1, the housing 2 is attached to the bracket 102 of the vehicle body 100 via a first pivot bolt 104. As shown in FIGS. 2A and 2B, when the stand 101 is in the predetermined position, the circuit board 30 has the tip 31a of the coil 31 all or part of the circuit board 30 being detected via a part of the housing 2 (cover 2b). It is placed in the housing 2 so as to face the part 42. The predetermined position of the present invention may be the standing position of the stand 101 or the storage position of the stand 101. In this embodiment, the predetermined position is the standing position of the stand 101 as shown in FIG. When in position, the entire tip surface 31a of the coil 31 faces the detected portion 42 via a part of the housing 2 (cover 2b). Further, as shown in FIG. 3B, when the stand 101 is in the retracted position, the entire distal end surface 31a of the coil 31 is directed outside the presence range of the detected portion 42 via a part of the housing 2 (cover 2b). Yes. As shown in FIGS. 2B and 3A, when the stand 101 is in the predetermined position, the separation distance (D) of the distal end surface 31 a of the coil 31 from the detected portion 42 is the housing facing the distal end surface 31 a of the coil 31. In addition to the thickness (T) of a part of 2 (cover 2b), only a clearance as a spatial distance (a distance consisting only of a space) is included. In the example of FIG. 2B, the clearance includes only the first clearance (C1) and the second clearance (C2). The first clearance (C1) is a spatial distance provided between the detected portion 42 and a part of the housing 2 (cover 2b) facing the tip surface 31a of the coil 31 so as not to contact each other. . The second clearance (C2) is a spatial distance provided between a part of the housing 2 (cover 2b) and the tip surface 31a of the coil 31 so as not to contact each other. However, the present invention is not limited to this, and the clearance of the present invention may include only the first clearance (C1). In short, it is desirable that the clearance of the present invention includes at least the first clearance (C1) of only the first clearance (C1) and the second clearance (C2).

FIG. 4 shows the relationship between the rotation angle of the rotor 4 and the conductance. The solid line c in FIG. 4 shows the characteristics of this embodiment (in the case of a planar coil), and the alternate long and short dash line d shows the conventional example (the coil wound around the bobbin). ) Characteristics. As can be seen from this figure, in this embodiment, the change in conductance with respect to the change in the angle of the rotor 4 is larger than that in the conventional example, so that the sensitivity can be improved. In addition, since high sensitivity is obtained, an allowable range of variation in the gap provided between the coil 31 and the detected portion 42 can be increased, and manufacturing is facilitated. Further, since the coil 31 is composed of a planar coil formed on the circuit board 30, a process of insert-molding a core into a bobbin, a process of winding a coil around a bobbin, and a coil as a circuit board of a detection circuit as in the conventional example. Thus, the manufacturing process can be simplified.

In the present embodiment, the integrated circuit 32 (the circuit component of the detection circuit) is mounted on the surface of the circuit board 30 opposite to the surface on the detected portion 42 side.

Thereby, compared with the case where the integrated circuit 32 is mounted on the surface of the circuit board 30 on the detected part 42 side, the gap between the coil 31 and the detected part 42 can be further reduced, and the detection sensitivity is further improved. .

In the present embodiment, the coil pattern constituting the planar coil 31 is formed on both surfaces of the circuit board 30, but at least the surface of the detected part 42 side (the second surface of the circuit board 30) has the planar coil 31. The coil pattern should just be formed.

While the invention has been described in terms of several preferred embodiments, various modifications and variations can be made by those skilled in the art without departing from the true spirit and scope of the invention, ie, the claims.

Claims

A rotary sensor configured to detect whether or not a bar-shaped piece configured to rotate on a pivot axis is in a predetermined position with respect to an object including the bar-shaped piece;
A housing attached to the body of the object;
A rotor provided to rotate according to the rotation of the rod-shaped piece;
A sensing object made of a conductive material and held by either the housing or the rotor;
A coil provided to generate a conductance corresponding to a distance to the detected object that changes with rotation of the rotor;
A detection circuit configured to detect whether the bar-like piece is at the predetermined position from the conductance of the coil;
The rotary sensor according to claim 1, wherein the coil is a planar coil formed on a substrate.
The object is a motorcycle, and the body of the object is a body of the motorcycle;
The rod-shaped piece is a stand of the motorcycle for holding the vehicle body in an upright state,
The rotary sensor according to claim 1, wherein the predetermined position is a storage position of the stand.
3. The rotary sensor according to claim 2, wherein a circuit component of the detection circuit is mounted on a surface of the substrate opposite to the surface on the detected object side.
The rotor includes the detected body,
The housing is attached to the body of the object such that the rotor rotates with the rod-like piece interposed between the housing and the body of the object;
The substrate is placed in the housing such that when the rod-shaped piece is in the predetermined position, all or a part of the tip end surface of the coil faces the object to be detected through a part of the housing. ,
When the rod-shaped piece is at the predetermined position, the separation distance between the detected object and the tip surface of the coil is a spatial distance in addition to the thickness of a part of the housing that faces the tip surface of the coil. The rotary sensor according to claim 1, wherein only the clearance is included.
The clearance includes only a first clearance, which is a spatial distance provided between the detected body and a part of the housing facing the tip end surface of the coil so as not to contact each other. The rotary sensor according to claim 4, wherein the rotary sensor is provided.
The clearance includes only the first clearance and the second clearance,
The first clearance is a spatial distance provided between the detected body and a part of the housing facing the tip end surface of the coil so as not to contact each other.
The rotary sensor according to claim 4, wherein the second clearance is a spatial distance provided between a part of the housing and a tip end surface of the coil so as not to contact each other.
The housing includes a body having a recess in which the substrate is placed, and a cover attached to the body so as to close the recess,
The substrate includes a first surface on which the detection circuit is mounted, and a second surface on which the coil is mounted so that a tip surface of the coil faces the cover,
The rotary sensor according to claim 4, wherein the cover corresponds to a part of the housing, and a thickness of the cover corresponds to a thickness of a part of the housing that faces a front end surface of the coil.