Position detection device

Abstract

A position detection device is provided with a first target (22, 23) that reciprocates in a predetermined movement direction (Dc), a second target (24, 25) that reciprocates in the movement direction together with the first target, and a substrate (30). The substrate has a first receiving coil and a second receiving coil, which are disposed on one side of the substrate in the normal direction (Da) with respect to the first and second targets, and which output a detection signal corresponding to the position of the first target by electromagnetic induction. The substrate has a third receiving coil and a fourth receiving coil that output a detection signal corresponding to the position of the second target by electromagnetic induction, and first and second receiving regions (301, 302) occupied by the first and second receiving coils in the substrate and second receiving regions (303, 304) occupied by the third and fourth receiving coils in the substrate are arranged side by side in the movement direction. The first target reciprocates within an operation range (W1a, W1b) in which the first target does not overlap with the second reception region on the other side in the normal direction.

Description

[0001] Cross-reference to Related Applications

[0002] This application is based on Japanese Patent Application No. 2022-188428 filed on November 25, 2022, the contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a position detection device. Background Art

[0004] As such a position detection device, for example, an angular position sensor described in Patent Document 1 has been conventionally known. The angular position sensor described in Patent Document 1 detects the rotational position of a detection object rotating about a rotation axis by electromagnetic induction. Therefore, the angular position sensor of Patent Document 1 includes two sets of combinations of coils each composed of a transmitting coil that generates an alternating magnetic field and two receiving coils disposed inside the transmitting coil.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: U.S. Patent Application Publication No. 2022 / 0136869 Summary of the Invention

[0008] In Patent Document 1, the detection object whose rotational position is detected by the angular position sensor rotates more than one full turn about the rotation axis, but depending on the application, a case where the detection object reciprocates within a limited range of motion is also envisioned. In such a case, in order to achieve redundancy, the inventors considered the following structure. That is, the inventors considered a structure in which a first target and a second target are provided on the detection object, and the position detection device includes a receiving coil for detecting the position of the first target and a receiving coil for detecting the position of the second target, respectively.

[0009] However, in such a structure considered by the inventors, it is possible that the output value of the receiving coil for detecting the position of one of the first target and the second target is affected by the other target. As a result of the inventors' detailed research, the above situation was found.

[0010] In view of the above points, an object of the present disclosure is to reduce the influence of a first target on the output value of a receiving coil for detecting the position of a second target in a position detection device that separately detects the positions of the first target and the second target.

[0011] To achieve the above object, according to one aspect of the present disclosure, a position detection device includes: a first target that reciprocates in a specified moving direction; a second target that reciprocates in the moving direction together with the first target; and a substrate having a first transmission coil, a second transmission coil, a first reception coil, a second reception coil, a third reception coil, and a fourth reception coil. An induced current flows through the first reception coil and the second reception coil due to electromagnetic induction generated by energizing the first transmission coil, and a detection signal corresponding to the position of the first target is output. An induced current flows through the third reception coil and the fourth reception coil due to electromagnetic induction generated by energizing the second transmission coil, and a detection signal corresponding to the position of the second target is output. Let the direction crossing the moving direction be the normal direction. The substrate faces the first target and the second target and is disposed on one side in the normal direction with respect to the first target and the second target. The first reception area occupied by the first reception coil and the second reception coil in the substrate and the second reception area occupied by the third reception coil and the fourth reception coil in the substrate are arranged in the moving direction. The first target reciprocates within an operating range where the first target does not overlap with the other side of the second reception area on the side opposite to one side in the normal direction.

[0012] In this way, it is possible to prevent the first target from interfering with the magnetic flux passing through the third reception coil and the fourth reception coil for detecting the position of the second target. Therefore, it is possible to reduce the influence of the first target on the output values (i.e., detection signals) of the third reception coil and the fourth reception coil.

[0013] In addition, in each column of the application document, sometimes reference numerals in parentheses are assigned to each element. In this case, the reference numerals only represent an example of the correspondence between the element and the specific structure described in the following embodiments. Therefore, the present disclosure is not limited by any of the descriptions of the reference numerals. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram showing the position detection device in the first embodiment as viewed in the direction along the axial direction of the component and showing the schematic structure of the position detection device.

[0015] Figure 2 represents Figure 1 a cross-sectional view taken along the II-II section, which is a longitudinal cross-sectional view of the position detection device.

[0016] Figure 3 represents Figure 1 a cross-sectional view taken along the III-III section, which is a longitudinal cross-sectional view of the position detection device shown in a different orientation from Figure 2 that.

[0017] Figure 4This is a top view showing the rotating member of the position detection device in the first embodiment in a single unit.

[0018] Figure 5 This is a diagram showing the substrate of the position detection device in the first embodiment in a single unit and schematically showing each coil in the substrate.

[0019] Figure 6 This is Figure 5 a VI-direction end view, which is a diagram schematically showing each transmission coil in the substrate.

[0020] Figure 7 This is equivalent to Figure 5 a diagram, which is a schematic diagram showing the replacement of the receiving coil shown in this Figure 5 with the receiving area formed by the receiving coil.

[0021] Figure 8 This is a block diagram of the position detection device in the first embodiment.

[0022] Figure 9 This is a diagram respectively exemplifying the waveforms of the first voltage value output from the first receiving coil and the second voltage value output from the second receiving coil in the first embodiment.

[0023] Figure 10 This is a diagram showing the substrate of the position detection device in the second embodiment in a single unit and schematically showing each coil in the substrate, and is equivalent to Figure 5 a diagram.

[0024] Figure 11 This is a diagram showing the substrate of the position detection device in the third embodiment in a single unit and schematically showing each coil in the substrate, and is equivalent to Figure 5 a diagram.

[0025] Figure 12 This is a diagram showing the substrate of the position detection device in the fourth embodiment in a single unit and schematically showing each coil in the substrate, and is equivalent to Figure 5 a diagram.

[0026] Figure 13 This is a block diagram of the position detection device in the fifth embodiment and is equivalent to Figure 8 a diagram.

[0027] Figure 14 This is a flowchart showing the control process executed by the first failure detection unit in the fifth embodiment.

[0028] Figure 15This is a diagram showing the relationship between the outputs of the first sensor and the second sensor and the rotation angle of the rotating member in the first comparative example when compared with the fifth embodiment.

[0029] Figure 16 This is a schematic diagram showing the position detection device in the sixth embodiment as viewed in the direction along the axial direction of the member and showing the schematic structure of the position detection device, and is equivalent to Figure 1 the figure of.

[0030] Figure 17 This is a diagram showing Figure 16 the cross-sectional view of the XVII-XVII section of, and is equivalent to Figure 2 the figure of.

[0031] Figure 18 This is a diagram showing Figure 16 the cross-sectional view of the XVIII-XVIII section of, and is equivalent to Figure 3 the figure of. Detailed Embodiments

[0032] Hereinafter, each embodiment will be described with reference to the drawings. In addition, in the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings.

[0033] (First Embodiment)

[0034] In this embodiment, an example is described in which the position detection device 1 is used to detect the rotational position of the brake pedal or the accelerator pedal of a vehicle pedal device. In addition, in the following description, the brake pedal or the accelerator pedal may sometimes be simply referred to as the pedal.

[0035] As Figures 1 to 3 shown, the position detection device 1 of this embodiment includes a rotating member 20 and a substrate 30. In addition, Figures 1 to 3 the rotation axis CL shown in is the rotation axis 70 of the pedal and the rotation center of the rotating member 20. In addition, in the description of this embodiment, the axial direction Da of the rotation axis CL is also referred to as the member axial direction Da, the radial direction Dr of the rotation axis CL is also referred to as the member radial direction Dr, and the circumferential direction Dc of the rotation axis CL is also referred to as the member circumferential direction Dc. These directions Da, Dr, and Dc are mutually intersecting directions, and strictly speaking, are mutually perpendicular directions. In addition, Figure 1 This is a cross-sectional view of the I-I section showing Figure 2 .

[0036] The rotating member 20 is made of metal and is formed in a flat plate shape having a thickness in the member axial direction Da. As Figures 1 to 4As shown, the rotating member 20 is connected to the rotating shaft 70 in a non-rotatable manner relative to the rotating shaft 70. For example, the rotating member 20 can be non-rotatable relative to the rotating shaft 70 either by a rotation-preventing key member or by welding relative to the rotating shaft 70.

[0037] The rotating member 20 is supported by the non-rotating member via the rotating shaft 70 in such a manner that it can rotate about a specified rotation axis CL, and rotates integrally with the pedal and the rotating shaft 70. Therefore, by detecting the rotation position of the rotating member 20, the rotation position of the pedal can be detected. That is, the rotation position of the rotating member 20 is both the rotation position of the pedal and the rotation position of the rotating shaft 70 as the object to be detected.

[0038] In addition, since the rotating shaft member 20 is connected to the rotating shaft 70 of the pedal, it does not rotate one full turn about the rotation axis CL, but reciprocates within a specified angular range about the rotation axis CL as the pedal is depressed. In Figure 1 FIG., a part of the outer shape of each of the targets 22 to 25 of the rotating member 20 at the end positions during this reciprocating motion is illustrated by a double-dashed line.

[0039] The rotating member 20 has a connecting portion 21, two first targets 22, 23, and two second targets 24, 25. That is, the two first targets 22, 23 and the two second targets 24, 25 included in the rotating member 20 rotate integrally about the rotation axis CL. And as the pedal is depressed, the two first targets 22, 23 and the two second targets 24, 25 all reciprocate in the circumferential direction Dc of the member. In the present embodiment, the circumferential direction Dc of the member corresponds to the specified moving direction of the present disclosure.

[0040] For example, the rotating member 20 is configured as a single part including its connecting portion 21, two first targets 22, 23, and two second targets 24, 25. For example, the rotating member 20 is formed in a flat plate shape with a uniform thickness in the axial direction Da of the member. Therefore, the thicknesses of the four targets 22 to 25 in the axial direction Da of the member are the same size. In addition, in the description of the present embodiment, the two first targets 22, 23 and the two second targets 24, 25 may sometimes be collectively referred to as targets 22 to 25.

[0041] The connecting portion 21 is disposed in the central portion of the rotating member 20 and has an annular shape centered on the rotation axis CL. Inside the connecting portion 21, an insertion hole 21a that penetrates the connecting portion 21 in the axial direction Da of the member is formed, and the rotating shaft 70 is inserted into the insertion hole 21a in a non-rotatable manner relative to the connecting portion 21. That is, the rotating member 20 is connected to the rotating shaft 70 by the connecting portion 21.

[0042] Two first targets 22 and 23 are respectively formed so as to protrude outward from the connecting portion 21 in the radial direction Dr of the component, and two second targets 24 and 25 are also respectively formed so as to protrude outward from the connecting portion 21 in the radial direction Dr of the component.

[0043] The first one target 22, which is one of the two first targets 22 and 23, is arranged on the opposite side of the first other target 23, which is the other of the two first targets 22 and 23, with the rotation axis CL interposed therebetween. In addition, the second one target 24, which is one of the two second targets 24 and 25, is arranged on the opposite side of the second other target 25, which is the other of the two second targets 24 and 25, with the rotation axis CL interposed therebetween.

[0044] Specifically, these four targets 22 to 25 are arranged in the order of the first one target 22, the second one target 24, the first other target 23, and the second other target 25, with equal intervals (specifically, 90-degree intervals) and spaced apart from each other on one side in the circumferential direction Dc of the component. For example, when viewed along the axial direction Da of the component, the four targets 22 to 25 are arranged point-symmetrically about the rotation axis CL as a whole.

[0045] The first one target 22 is formed on one side in the axial direction Da of the component and has an opposing surface 22a that opposes the other surface 30b of the substrate 30. The first other target 23 is also formed on one side in the axial direction Da of the component and has an opposing surface 23a that opposes the other surface 30b of the substrate 30. In addition, the second one target 24 is also formed on one side in the axial direction Da of the component and has an opposing surface 24a that opposes the other surface 30b of the substrate 30. The second other target 25 is also formed on one side in the axial direction Da of the component and has an opposing surface 25a that opposes the other surface 30b of the substrate 30. These opposing surfaces 22a to 25a are formed parallel to the other surface 30b of the substrate 30.

[0046] The first one target 22 has one end edge 221 provided on one side in the circumferential direction Dc of the component and the other end edge 222 provided on the other side in the circumferential direction Dc of the component. And the first one target 22 has a fan shape in which the width in the circumferential direction Dc of the component increases as it approaches the outside in the radial direction Dr of the component. Thus, when viewed along the axial direction Da of the component, one end edge 221 and the other end edge 222 of the first one target 22 respectively extend linearly along the radial direction Dr of the component. That is, one end edge 221 and the other end edge 222 of the first one target 22 respectively extend in a direction orthogonal to the circumferential direction Dc of the component, which is the moving direction of the first one target 22.

[0047] In addition, the first other target 23, the second one-side target 24, and the second other target 25 also have the same sector shape as the first one-side target 22. In the present embodiment, all four targets 22 to 25 have the same shape.

[0048] Therefore, when viewed in the direction of the component axial direction Da, in the first other target 23, one end edge 231 provided on one side in the component circumferential direction Dc and the other end edge 232 provided on the other side in the component circumferential direction Dc also linearly extend along the component radial direction Dr, respectively. In addition, when viewed in the direction of the component axial direction Da, in the second one-side target 24, one end edge 241 provided on one side in the component circumferential direction Dc and the other end edge 242 provided on the other side in the component circumferential direction Dc also linearly extend along the component radial direction Dr, respectively. In addition, when viewed in the direction of the component axial direction Da, in the second other target 25, one end edge 251 provided on one side in the component circumferential direction Dc and the other end edge 252 provided on the other side in the component circumferential direction Dc also linearly extend along the component radial direction Dr, respectively.

[0049] In the present embodiment, since the four targets 22 to 25 are all of the same shape and rotate integrally as described above, the movement ranges W1a, W1b, W2a, and W2b of the respective targets 22 to 25 are of the same length in the component circumferential direction Dc.

[0050] In addition, the movement range W1a of the first one-side target 22 is the maximum range on the component circumferential direction Dc reached by the first one-side target 22 as the first one-side target 22 reciprocates, and the first one-side target 22 reciprocates in the component circumferential direction Dc within this movement range W1a. In addition, the movement range W1b of the first other target 23 is the maximum range on the component circumferential direction Dc reached by the first other target 23 as the first other target 23 reciprocates, and the first other target 23 reciprocates in the component circumferential direction Dc within this movement range W1b. In addition, the movement range W2a of the second one-side target 24 is the maximum range on the component circumferential direction Dc reached by the second one-side target 24 as the second one-side target 24 reciprocates, and the second one-side target 24 reciprocates in the component circumferential direction Dc within this movement range W2a. In addition, the movement range W2b of the second other target 25 is the maximum range on the component circumferential direction Dc reached by the second other target 25 as the second other target 25 reciprocates, and the second other target 25 reciprocates in the component circumferential direction Dc within this movement range W2b.

[0051] As Figures 1 to 3 、 Figure 5As shown, the substrate 30 is a multilayer printed substrate on which a wiring pattern is formed and electronic components (not shown) are mounted. The substrate 30 has a planar first surface 30a and a second surface 30b that are orthogonal to the component axis Da. That is, the normal direction of the substrate 30 coincides with the component axis Da. The first surface 30a of the substrate 30 is provided on one side of the component axis Da in the substrate 30, and the second surface 30b of the substrate 30 is provided on the other side of the substrate 30, which is opposite to the one side of the component axis Da.

[0052] The substrate 30 is a non-rotating component that does not rotate relative to the vehicle body or the like. Therefore, the rotating component 20 rotates relative to the substrate 30.

[0053] The substrate 30 is disposed on one side of the component axis Da with respect to the four targets 22 to 25. Moreover, the second surface 30b of the substrate 30 faces the respective opposing surfaces 22a to 25a of the four targets 22 to 25 with an axial interval AG in the component axis Da. This axial interval AG is the same size between the substrate 30 and each of the four targets 22 to 25.

[0054] In addition, the substrate 30 has a disk shape centered on the rotation axis CL, and a through hole 30c that penetrates the substrate 30 in the component axis Da is formed at the center of the substrate 30. The rotation shaft 70 is inserted and passed through the through hole 30c.

[0055] As Figure 5 、 Figure 6 shown, the substrate 30 has a first transmission coil 31 and a second transmission coil 32 formed as a wiring pattern. In addition, the substrate 30 also has two first reception coils 34, 36, two second reception coils 35, 37, two third reception coils 40, 42, and two fourth reception coils 41, 43 formed as a wiring pattern. That is, all the transmission coils 31, 32 and all the reception coils 34 to 37, 40 to 43 provided in the position detection device 1 are formed on a single substrate 30.

[0056] Each of the coils 31, 32, 34 to 37, 40 to 43 included in the substrate 30 is connected to signal processing units 47, 48 (see Figure 8 ) constituted by an IC or the like and mounted on the substrate 30 via a connection wiring pattern (not shown). In addition, in Figure 5 、 Figure 6 , for easy viewing of the drawing, each of the coils 31, 32, 34 to 37, 40 to 43 is simply shown, and the same applies to the following drawings showing each of the coils 31, 32, 34 to 37, 40 to 43.

[0057] The first and second transmission coils 31 and 32 are formed to overlap each other when viewed in the direction along the component axis Da, but are arranged offset in the thickness direction of the substrate 30, i.e., the component axis Da. For example, the first transmission coil 31 is arranged to be separated from the second transmission coil 32 on one side in the direction of the component axis Da.

[0058] The first and second transmission coils 31 and 32 are each wound one or more turns to form a circular ring shape. And when viewed in the direction along the component axis Da, the first and second transmission coils 31 and 32 are each formed so as to surround all of the receiving coils 34 to 37, 40 to 43 provided in the substrate 30. In other words, when viewed in the direction along the component axis Da, all of these receiving coils 34 to 37, 40 to 43 are arranged inside the first transmission coil 31 and inside the second transmission coil 32.

[0059] Therefore, if an alternating current flows through the first transmission coil 31, then due to the electromagnetic induction generated by energizing the first transmission coil 31, an induced current flows through all of the receiving coils 34 to 37, 40 to 43. In addition, even if an alternating current flows through the second transmission coil 32, an induced current also flows through all of the receiving coils 34 to 37, 40 to 43 due to the electromagnetic induction generated by energizing the second transmission coil 32. Further, in order to prevent the magnetic fields generated by the first transmission coil 31 and the second transmission coil 32 from canceling each other out, for example, alternating currents having the same phase and the same frequency flow through the first transmission coil 31 and the second transmission coil 32.

[0060] The first one - side receiving coil 34, which is one of the two first receiving coils 34 and 36, and the second one - side receiving coil 35, which is one of the two second receiving coils 35 and 37, are coils for detecting the position of the first one - side target 22 in the circumferential direction Dc of the component. That is, induced electromotive forces corresponding to the position of the first one - side target 22 are generated in the first one - side receiving coil 34 and the second one - side receiving coil 35, respectively.

[0061] In addition, the first other - side receiving coil 36, which is the other of the two first receiving coils 34 and 36, and the second other - side receiving coil 37, which is the other of the two second receiving coils 35 and 37, are coils for detecting the position of the first other - side target 23 in the circumferential direction Dc of the component. That is, induced electromotive forces corresponding to the position of the first other - side target 23 are generated in the first other - side receiving coil 36 and the second other - side receiving coil 37, respectively.

[0062] The two first receiving coils 34 and 36 are electrically connected. Specifically, these two first receiving coils 34 and 36 are connected in series with each other in a direction that makes their outputs (in other words, the above-mentioned induced electromotive forces of each other) reinforce each other. Therefore, these two first receiving coils 34 and 36 output detection signals corresponding to the positions of the first targets 22 and 23. The "direction in which the outputs reinforce each other" related to the above-mentioned series connection means the direction in which the outputs of each other are reinforced in the two patterns when assuming that the two patterns of the direction in which the outputs of each other reinforce each other and the direction in which they cancel each other are set as the series connection direction. The detection signals from the first receiving coils 34 and 36 are, for example, equivalent to the first voltage value V1 shown in Figure 9 described later. In addition, the detection signals from the first receiving coils 34 and 36 refer to the detection signals output from the conductor having these first receiving coils 34 and 36, and not the detection signals output separately from the two first receiving coils 34 and 36 to the receiving unit 472 (refer to Figure 8 ). This is the same in the following description.

[0063] In addition, the two second receiving coils 35 and 37 are also electrically connected. Specifically, these two second receiving coils 35 and 37 are connected in series with each other in a direction that makes their outputs reinforce each other. Therefore, these two second receiving coils 35 and 37 output detection signals corresponding to the positions of the first targets 22 and 23. The detection signals from the second receiving coils 35 and 37 are, for example, equivalent to the second voltage value V2 shown in Figure 9 described later. In addition, the outputs of the two first receiving coils 34 and 36 corresponding to the positions of the first targets 22 and 23 are the same as each other. Similarly, the outputs of the two second receiving coils 35 and 37 corresponding to the positions of the first targets 22 and 23 are also the same as each other.

[0064] In addition, the third one receiving coil 40, which is one of the two third receiving coils 40 and 42, and the fourth one receiving coil 41, which is one of the two fourth receiving coils 41 and 43, are coils used to detect the position of the second one target 24 on the circumferential direction Dc of the component. That is, induced electromotive forces corresponding to the position of the second one target 24 are generated in the third one receiving coil 40 and the fourth one receiving coil 41 respectively.

[0065] In addition, the third other receiving coil 42, which is the other of the two third receiving coils 40 and 42, and the fourth other receiving coil 43, which is the other of the two fourth receiving coils 41 and 43, are coils used to detect the position of the second other target 25 on the circumferential direction Dc of the component. That is, induced electromotive forces corresponding to the position of the second other target 25 are generated in the third other receiving coil 42 and the fourth other receiving coil 43 respectively.

[0066] Two third receiving coils 40 and 42 are electrically connected. Specifically, these two third receiving coils 40 and 42 are connected in series with each other in a direction such that their outputs (in other words, the above-mentioned induced electromotive forces of each other) are strengthened. Therefore, these two third receiving coils 40 and 42 output detection signals corresponding to the positions of the second targets 24 and 25.

[0067] Moreover, two fourth receiving coils 41 and 43 are also electrically connected. Specifically, these two fourth receiving coils 41 and 43 are connected in series with each other in a direction such that their outputs are strengthened. Therefore, these two fourth receiving coils 41 and 43 output detection signals corresponding to the positions of the second targets 24 and 25. In addition, the outputs of the two third receiving coils 40 and 42 corresponding to the positions of the second targets 24 and 25 are the same as each other. Similarly, the outputs of the two fourth receiving coils 4l and 43 corresponding to the positions of the second targets 24 and 25 are also the same as each other.

[0068] Each of the receiving coils 34 to 37 and 40 to 43 is configured to appropriately connect different wiring layers via vias so as not to interfere with each other (that is, so as not to overlap). In Figure 5 and the following figures corresponding to this Figure 5 the illustration of the vias of the substrate 30 is appropriately omitted.

[0069] The first one-sided receiving coil 34 has a first spiral portion 34a and a second spiral portion 34b. When viewed in the direction along the component axis Da, the first and second spiral portions 34a and 34b are respectively in the shape of a spiral pattern. In other words, when viewed in the direction along the component axis Da, the first and second spiral portions 34a and 34b are respectively formed in a manner of depicting a planar curve wound in a spiral shape. The first and second spiral portions 34a and 34b are connected in series via, for example, a connection wiring pattern (not shown). In addition, the outer shapes of the first and second spiral portions 34a and 34b are not limited to Figure 5 the shape shown, and may be other shapes such as a circle.

[0070] The same applies to the other receiving coils 35 to 37 and 40 to 43. That is, the second one-sided receiving coil 35 has a first spiral portion 35a and a second spiral portion 35b connected in series with each other. In addition, the first other-sided receiving coil 36 has a first spiral portion 36a and a second spiral portion 36b connected in series with each other, and the second other-sided receiving coil 37 has a first spiral portion 37a and a second spiral portion 37b connected in series with each other.

[0071] In addition, the third-party receiving coil 40 has a first spiral portion 40a and a second spiral portion 40b connected in series with each other, and the fourth-party receiving coil 41 has a first spiral portion 41a and a second spiral portion 41b connected in series with each other. In addition, the third-other-party receiving coil 42 has a first spiral portion 42a and a second spiral portion 42b connected in series with each other, and the fourth-other-party receiving coil 43 has a first spiral portion 43a and a second spiral portion 43b connected in series with each other. These spiral portions 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b are respectively the same as the spiral portions 34a, 34b of the first-party receiving coil 34, and when viewed in the direction along the component axis Da, they have a spiral pattern shape.

[0072] The spiral portions 34a, 34b of the first-party receiving coil 34 are configured to overlap the first-party target 22 on one side in the component axis Da at a certain position within the operation range W1a of the first-party target 22. And the spiral portions 35a, 35b of the second-party receiving coil 35 are also configured to overlap the first-party target 22 on one side in the component axis Da at a certain position within the operation range W1a of the first-party target 22.

[0073] Moreover, these spiral portions 34a, 34b, 35a, 35b are arranged and configured in the order of the first spiral portion 34a, the first spiral portion 35a, the second spiral portion 34b, and the second spiral portion 35b from one side to the other side in the component circumferential direction Dc. In addition, these spiral portions 34a, 34b, 35a, 35b form a region when viewed in the direction along the component axis Da.

[0074] That is, the first-party receiving coil 34 and the second-party receiving coil 35 form the first-party receiving region 301 occupied by these receiving coils 34, 35 in the substrate 30. And the first-party receiving coil 34 and the second-party receiving coil 35 constitute the first-party receiving coil group 301a as a combination of these receiving coils 34, 35. This first-party receiving coil group 301a corresponds to the party receiving coil group of the present disclosure.

[0075] Similarly to the above, the spiral portions 36a, 36b of the first-other-party receiving coil 36 are configured to overlap the first-other-party target 23 on one side in the component axis Da at a certain position within the operation range W1b of the first-other-party target 23. And the spiral portions 37a, 37b of the second-other-party receiving coil 37 are also configured to overlap the first-other-party target 23 on one side in the component axis Da at a certain position within the operation range W1b of the first-other-party target 23.

[0076] Moreover, these spiral portions 36a, 36b, 37a, 37b are arranged and disposed in the order of the first spiral portion 36a, the first spiral portion 37a, the second spiral portion 36b, and the second spiral portion 37b from one side to the other side of the component circumferential direction Dc. In addition, these spiral portions 36a, 36b, 37a, 37b form a region when viewed in the direction along the component axial direction Da.

[0077] That is, the first other receiving coil 36 and the second other receiving coil 37 form a first other receiving region 302 occupied by these receiving coils 36, 37 in the substrate 30. And the first other receiving coil 36 and the second other receiving coil 37 constitute a first other receiving coil group 302a as a combination of these receiving coils 36, 37. This first other receiving coil group 302a corresponds to the other receiving coil group of the present disclosure.

[0078] In addition, the spiral portions 40a, 40b of the third one receiving coil 40 are configured to overlap the second one target 24 on one side in the component axial direction Da at a certain position within the operation range W2a of the second one target 24. And the spiral portions 41a, 41b of the fourth one receiving coil 41 are also configured to overlap the second one target 24 on one side in the component axial direction Da at a certain position within the operation range W2a of the second one target 24.

[0079] Moreover, these spiral portions 40a, 40b, 41a, 41b are arranged and disposed in the order of the first spiral portion 40a, the first spiral portion 41a, the second spiral portion 40b, and the second spiral portion 41b from one side to the other side of the component circumferential direction Dc. In addition, these spiral portions 40a, 40b, 41a, 41b form a region when viewed in the direction along the component axial direction Da.

[0080] That is, the third one receiving coil 40 and the fourth one receiving coil 41 form a second one receiving region 303 occupied by these receiving coils 40, 41 in the substrate 30. And the third one receiving coil 40 and the fourth one receiving coil 41 constitute a second one receiving coil group 303a as a combination of these receiving coils 40, 41.

[0081] In addition, the spiral portions 42a, 42b of the third other receiving coil 42 are configured to overlap the second other target 25 on one side in the component axial direction Da at a certain position within the operation range W2b of the second other target 25. And the spiral portions 43a, 43b of the fourth other receiving coil 43 are also configured to overlap the second other target 25 on one side in the component axial direction Da at a certain position within the operation range W2b of the second other target 25.

[0082] Moreover, these spiral portions 42a, 42b, 43a, and 43b are arranged and disposed in order of the first spiral portion 42a, the first spiral portion 43a, the second spiral portion 42b, and the second spiral portion 43b from one side to the other side of the component circumferential direction Dc. In addition, these spiral portions 42a, 42b, 43a, and 43b form a region when viewed in the direction along the component axial direction Da.

[0083] That is, the third other receiving coil 42 and the fourth other receiving coil 43 form the second other receiving region 304 occupied by these receiving coils 42 and 43 in the substrate 30. And the third other receiving coil 42 and the fourth other receiving coil 43 constitute the second other receiving coil group 304a as a combination of these receiving coils 42 and 43.

[0084] Figure 7 It is a diagram showing Figure 5 by replacing the receiving coils 34 to 37, 40 to 43 shown with the above-mentioned receiving regions 301, 302, 303, and 304. The above-mentioned first one receiving region 301 and the first other receiving region 302 correspond to the first receiving region of the present disclosure, and the second one receiving region 303 and the second other receiving region 304 correspond to the second receiving region of the present disclosure.

[0085] As Figure 5 , Figure 7 shown, the spiral portions 34a to 43b of the receiving coils 34 to 37, 40 to 43 are arranged in the component circumferential direction Dc as a whole so as to form an annular shape centered on the rotation axis CL. That is, the four receiving regions 301 to 304 are also arranged in the component circumferential direction Dc as a whole so as to form an annular shape centered on the rotation axis CL. The above-mentioned spiral portions 34a to 43b refer to the spiral portions 34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, and 43b.

[0086] Moreover, the four receiving regions 301 to 304 are arranged and disposed in order of the first one receiving region 301, the second other receiving region 304, the first other receiving region 302, and the second one receiving region 303 from one side to the other side of the component circumferential direction Dc. Specifically, the four receiving regions 301 to 304 are arranged and disposed at 90-degree intervals in the component circumferential direction Dc centered on the rotation axis CL.

[0087] Therefore, the first one - side receiving region 301 is arranged on the opposite sides of the rotation axis CL with respect to the first other - side receiving region 302, and the second one - side receiving region 303 is arranged on the opposite sides of the rotation axis CL with respect to the second other - side receiving region 304. That is, the first one - side receiving coil group 301a is arranged on the opposite sides of the rotation axis CL with respect to the first other - side receiving coil group 302a, and the second one - side receiving coil group 303a is arranged on the opposite sides of the rotation axis CL with respect to the second other - side receiving coil group 304a.

[0088] In addition, although it has been clearly described, on the circumferential direction Dc of the component, the end position P1 on one side of the first one - side receiving region 301 (i.e., the circumferential one - end position P1) coincides with the end position on one side of the first one - side receiving coil 34 (i.e., the end position on one side of the first spiral portion 34a). And on the circumferential direction Dc of the component, the end position P2 on the other side of the first one - side receiving region 301 (i.e., the circumferential other - end position P2) coincides with the end position on the other side of the second one - side receiving coil 35 (i.e., the end position on the other side of the second spiral portion 35b). The same relationship also applies to the first other - side receiving region 302, the second one - side receiving region 303, and the second other - side receiving region 304.

[0089] As Figure 1 、 Figure 7 shown, the first one - side target 22, as described above, reciprocates in the circumferential direction Dc of the component within the movement range W1a of the first one - side target 22. However, the movement range W1a of the first one - side target 22 is configured such that the first one - side target 22 does not overlap with the second one - side receiving region 303 and the second other - side receiving region 304 on the other side in the component axial direction Da. In other words, the first one - side target 22 reciprocates within the range deviated from the second one - side receiving region 303 and the second other - side receiving region 304 in the circumferential direction Dc of the component.

[0090] The same also applies to the other movement ranges W1b, W2a, and W2b. That is, the movement range W1b of the first other - side target 23 is configured such that the first other - side target 23 does not overlap with the second one - side receiving region 303 and the second other - side receiving region 304 on the other side in the component axial direction Da. In addition, the movement range W2a of the second one - side target 24 is configured such that the second one - side target 24 does not overlap with the first one - side receiving region 301 and the first other - side receiving region 302 on the other side in the component axial direction Da. In addition, the movement range W2b of the second other - side target 25 is configured such that the second other - side target 25 does not overlap with the first one - side receiving region 301 and the first other - side receiving region 302 on the other side in the component axial direction Da.

[0091] More specifically, the first one-sided target 22 reciprocates in a manner that does not exceed the range from the other side relative to the circumferential one-end position P1 of the first one-sided reception area 301 and the one side relative to the circumferential other-end position P2 of the first one-sided reception area 301 on the circumferential direction Dc of the component. The same applies to the positional relationships between the other targets 23, 24, 25 and the reception areas 302, 303, 304.

[0092] In addition, the movement range W1a of the first one-sided target 22 is a range distributed along the circumferential direction Dc of the component with the center position 301b of the first one-sided reception area 301 on the circumferential direction Dc of the component as the center. Specifically, this movement range W1a is symmetric on the circumferential direction Dc based on the center position 301b of the first one-sided reception area 301 on the circumferential direction Dc of the component. In addition, the "symmetry" of this movement range W1a is not symmetric in the strict sense. The same applies to the "symmetry" of the other movement ranges W1b, W2a, and W2b described later.

[0093] Similarly, the movement range W1b of the first other-sided target 23 is a range distributed along the circumferential direction Dc of the component with the center position 302b of the first other-sided reception area 302 on the circumferential direction Dc of the component as the center. Specifically, this movement range W1b is symmetric on the circumferential direction Dc based on the center position 302b of the first other-sided reception area 302 on the circumferential direction Dc of the component.

[0094] In addition, the movement range W2a of the second one-sided target 24 is a range distributed along the circumferential direction Dc of the component with the center position 303b of the second one-sided reception area 303 on the circumferential direction Dc of the component as the center. Specifically, this movement range W2a is symmetric on the circumferential direction Dc based on the center position 303b of the second one-sided reception area 303 on the circumferential direction Dc of the component.

[0095] In addition, the movement range W2b of the second other-sided target 25 is a range distributed along the circumferential direction Dc of the component with the center position 304b of the second other-sided reception area 304 on the circumferential direction Dc of the component as the center. Specifically, this movement range W2b is symmetric on the circumferential direction Dc based on the center position 304b of the second other-sided reception area 304 on the circumferential direction Dc of the component.

[0096] As Figure 8 shown, various electronic components are mounted on the substrate 30 in addition to the above-described coils 31, 32, 34 to 37, 40 to 43. Specifically, a plurality of capacitors 451, 452, 461, 462, the IC constituting the first signal processing unit 47, the IC constituting the second signal processing unit 48, the first terminal 49, the second terminal 50, etc. are also mounted on the substrate 30.

[0097] Moreover, the first transmission coil 31, two first reception coils 34 and 36, two second reception coils 35 and 37, two capacitors 451 and 452, the first signal processing unit 47, and the first terminal 49 constitute the first system 305. On the other hand, the second transmission coil 32, two third reception coils 40 and 42, two fourth reception coils 41 and 43, two capacitors 461 and 462, the second signal processing unit 48, and the second terminal 50 constitute the second system 306. Since these first system 305 and second system 306 are independent structures as circuits, the position detection device 1 can detect the rotational position of the rotating member 20 by the other even if one of the first system 305 and the second system 306 fails.

[0098] The first and second signal processing units 47 and 48 respectively have a structure of an in-vehicle microcomputer including a CPU, a RAM, a ROM, a non-volatile rewritable memory, etc. not shown. That is, the first and second signal processing units 47 and 48 respectively read and execute a computer program stored in the ROM or the non-volatile rewritable memory which is a non-transitory entity. By executing this computer program, a method corresponding to the computer program is executed. The same structure applies to the electronic control device 72 described later. The CPU is an abbreviation for Central Processing Unit, the ROM is an abbreviation for Read Only Memory, and the RAM is an abbreviation for Random Access Memory.

[0099] The first transmission coil 31, two first reception coils 34 and 36, and two second reception coils 35 and 37 are respectively connected to the first signal processing unit 47. In addition, between both ends of the first transmission coil 31 and the first signal processing unit 47, for example, two capacitors 451 and 452 are connected in series, and a portion connecting the respective capacitors 451 and 452 is connected to the ground potential. And the first signal processing unit 47 is connected to an electronic control device 72 provided outside the position detection device 1 via the first terminal 49 fixed to the substrate 30.

[0100] The connection relationships around the second signal processing unit 48 are the same. That is, the second transmission coil 32, two third reception coils 40 and 42, and two fourth reception coils 41 and 43 are respectively connected to the second signal processing unit 48. Further, between both ends of the second transmission coil 32 and the second signal processing unit 48, for example, two capacitors 461 and 462 are connected in series, and a portion connecting the respective capacitors 461 and 462 to each other is connected to the ground potential. And the second signal processing unit 48 is connected to an external electronic control device 72 via a second terminal 50 fixed to the substrate 30. Thus, the first signal processing unit 47 and the second signal processing unit 48 respectively output the rotational position (in other words, the rotation angle) of the rotating member 20 to the electronic control device 72.

[0101] Next, the operation of the above-described first signal processing unit 47 will be described.

[0102] As Figure 8 shown, the first signal processing unit 47 includes an oscillation unit 471 and a reception unit 472. The oscillation unit 471 is connected to both ends of the first transmission coil 31, and applies an alternating current of a prescribed frequency to the first transmission coil 31. Thereby, the first transmission coil 31 generates a magnetic field in the component axial direction Da passing through the reception coils 34 to 37 and 40 to 43. Due to this magnetic field, induced currents flow through the reception coils 34 to 37 and 40 to 43 respectively.

[0103] Two first reception coils 34 and 36 connected in series and two second reception coils 35 and 37 connected in series are respectively connected to the reception unit 472. The reception unit 472 obtains a conversion signal (that is, the first voltage value V1 in Figure 9 ) obtained by demodulating or performing AD conversion on the outputs from these two first reception coils 34 and 36. The outputs from these two first reception coils 34 and 36 are obtained by adding the output from one of the two first reception coils 34 and 36 to the output from the other. Further, the reception unit 472 also obtains a conversion signal (that is, the second voltage value V2 in Figure 9 ) obtained by demodulating or performing AD conversion on the outputs from the two second reception coils 35 and 37. The outputs from these two second reception coils 35 and 37 are obtained by adding the output from one of the two second reception coils 35 and 37 to the output from the other.

[0104] Moreover, the receiving unit 472 calculates the rotation angle (in other words, the rotation position) of the rotating member 20 based on the respective conversion signals it has obtained, for example, by performing an operation on the arctangent function using these conversion signals. In addition, regarding the relationship between the electrical angle θ and the rotation angle (i.e., the mechanical angle) of the rotating member 20 in the electrical signals of the first and second receiving coils 34, 36, 35, 37, it is predetermined, for example, according to the sizes of the first targets 22, 23 and the receiving coils 34, 36, 35, 37. Therefore, the rotating member 20 can be calculated based on the electrical angle θ. For example, in the present embodiment, the relationship between the electrical angle θ and the mechanical angle is the same in any of the receiving coil groups 301a, 302a, 303a, 304a.

[0105] When the receiving unit 472 calculates or determines the rotation position of the rotating member 20 based on the detection signals from the first and second receiving coils 34, 36, 35, 37 in this way, it outputs a signal indicating the rotation position of the rotating member 20 to the external electronic control device 72 via the first terminal 49.

[0106] The above is the basic operation of the first signal processing unit 47. In addition, the second signal processing unit 48 also has an oscillation unit 481 and a receiving unit 482 in the same way as the first signal processing unit 47. The oscillation unit 481 of the second signal processing unit 48 is the same as the oscillation unit 471 of the first signal processing unit 47, and the receiving unit 482 of the second signal processing unit 48 is the same as the receiving unit 472 of the first signal processing unit 47. Since the operation of the second signal processing unit 48 is the same as that of the first signal processing unit 47, the description of the operation of the second signal processing unit 48 is omitted.

[0107] Next, the first voltage value V1 of the first receiving coils 34, 36 and the second voltage value V2 of the second receiving coils 35, 37 when the rotating member 20 rotates are described.

[0108] For example, if an alternating current of a specified frequency is applied to the first transmitting coil 31, a magnetic field in the axial direction Da of the member is generated through the first one-side receiving coils 34 and 35 of the first one-side receiving coil group 301a. In addition, since the magnetic field changes due to the alternating current, an induced electromotive force is generated in the first one-side receiving coil 34 and the second one-side receiving coil 35 respectively by electromagnetic induction.

[0109] Moreover, if the first one-sided target 22 is opposed to the first transmission coil 31, the first one-sided reception coil 34, and the second one-sided reception coil 35, eddy currents are generated in the first one-sided target 22 and a magnetic field due to the eddy currents is generated. Therefore, in the magnetic field in the component axial direction Da passing through the first one-sided reception coil 34 and the second one-sided reception coil 35, the magnetic field passing through the portion opposed to the first one-sided target 22 is canceled by the magnetic field due to the eddy currents.

[0110] Moreover, as the rotating member 20 rotates, in each of the first one-sided reception coil 34 and the second one-sided reception coil 35, the position and size of the portion opposed to the first one-sided target 22 change. Above, the first one-sided reception coil group 301a has been described as an example, and the same applies to the first other-sided reception coil group 302a.

[0111] Therefore, as the rotating member 20 rotates, the first voltage value V1 generated in the first reception coils 34 and 36 and the second voltage value V2 generated in the second reception coils 35 and 37 change periodically. In the present embodiment, for example, as Figure 9 shown, the first voltage value V1 generated in the first reception coils 34 and 36 is in a sine wave shape, and the second voltage value V2 generated in the second reception coils 35 and 37 is in a cosine wave shape having the same wavelength as the first voltage value V1.

[0112] In addition, the voltage values generated in the third reception coils 40 and 42 and the voltage values generated in the fourth reception coils 41 and 43 are the same as those described above, and thus the description thereof is omitted.

[0113] As described above, according to the present embodiment, the first one-sided target 22 reciprocates in the component circumferential direction Dc. Moreover, the first one-sided target 22 reciprocates within an operation range W1a in which the first one-sided target 22 does not overlap with the second one-sided reception area 303 and the second other-sided reception area 304 on the other side in the component axial direction Da.

[0114] Therefore, it is possible to prevent the first one-sided target 22 from interfering with the magnetic flux passing through the third and fourth reception coils 40, 42, 41, and 43 for detecting the positions of the second targets 24 and 25. Therefore, it is possible to reduce the influence of the first one-sided target 22 on the output values (i.e., the respective detection signals) of the third and fourth reception coils 40, 42, 41, and 43.

[0115] In addition, the first one-sided target 22 and the first other-sided target 23 operate without affecting the signal processing of the second system 306, and the second one-sided target 24 and the second other-sided target 25 operate without affecting the signal processing of the first system 305. Therefore, the independence between the first system 305 and the second system 306 can be ensured.

[0116] (1) Further, according to the present embodiment, the operation range W1a of the first one-sided target 22 is a range distributed along the circumferential direction Dc of the component with the center position 301b of the first one-sided reception area 301 on the circumferential direction Dc of the component as the center. Therefore, the length of the first one-sided reception area 301 in the circumferential direction Dc of the component can be utilized to the maximum extent, and the operation range W1a of the first one-sided target 22 can be expanded.

[0117] (2) Further, according to the present embodiment, the first one-sided target 22 reciprocates in a manner that does not exceed the range on the other side with respect to the circumferential one end position P1 of the first one-sided reception area 301 and on the one side with respect to the circumferential other end position P2 of the first one-sided reception area 301 in the circumferential direction Dc of the component. Thereby, the influence of the first one-sided target 22 on the output values of the third and fourth reception coils 40, 42, 41, 43 can be further reduced.

[0118] (3) Further, according to the present embodiment, when viewed in the direction along the component axial direction Da, all the reception coils 34 to 37, 40 to 43 provided on the substrate 30 are arranged inside the first transmission coil 31 and inside the second transmission coil 32.

[0119] Therefore, for example, even if one of the first transmission coil 31 and the second transmission coil 32 cannot be energized due to disconnection or the like, an induced current can flow through all the reception coils 34 to 37, 40 to 43 by the other transmission coil. In addition, compared with the structure in which the reception coils 34, 36, 35, 37 belonging to the first system 305 and the reception coils 40, 42, 41, 43 belonging to the second system 306 are respectively surrounded by the first transmission coil 31 and the second transmission coil 32, the areas required for the first and second transmission coils 31, 32 can be reduced.

[0120] (4) Further, according to the present embodiment, the respective spiral portions 34a to 43b of the reception coils 34 to 37, 40 to 43 all have a spiral pattern shape when viewed in the direction along the component axial direction Da. Therefore, for example, compared with the case where each of the reception coils 34 to 37, 40 to 43 is formed by a pattern shape depicting a sine wave or a cosine wave, the number of wiring layers formed on the substrate 30 is reduced, and it can be manufactured more simply.

[0121] (5) Further, according to the present embodiment, as Figure 1 、 Figure 5 shown, the first one-sided target 22 is arranged on the opposite side of the first other-sided target 23 with the rotation axis CL interposed therebetween. Moreover, the first one-sided reception coil group 301a is arranged on the opposite side of the first other-sided reception coil group 302a with the rotation axis CL interposed therebetween.

[0122] Accordingly, a structure that can easily reduce the influence of the eccentricity of the rotating member 20 on the output of the position detection device 1 indicating the rotational position of the rotating member 20 can be easily obtained. In short, a structure that can withstand the eccentricity of the rotating member 20 can be easily obtained.

[0123] For example, consider a case where the rotating member 20 is eccentric upward in the drawing plane in Figure 1 . In this case, when observing the first system 305, in the first one-side receiving region 301, the projected area of the first one-side target 22 overlapping the first and second one-side receiving coils 34 and 35 decreases due to the eccentricity of the rotating member 20. On the contrary, in the first other-side receiving region 302, the projected area of the first other-side target 23 overlapping the first and second other-side receiving coils 36 and 37 increases due to the eccentricity of the rotating member 20. And if the projected area of this target changes, the output of the receiving coil also changes accordingly.

[0124] Furthermore, assuming the direction from one side to the other side of the component circumferential direction Dc as the positive direction and observing the second system 306, the second one-side target 24 is advanced due to the eccentricity of the rotating member 20, and conversely, the second other-side target 25 is delayed due to the eccentricity of the rotating member 20.

[0125] In this way, between the first one-side receiving coil group 301a and the first other-side receiving coil group 302a that are point-symmetric to each other with the rotation axis CL as the center and belong to the first system 305, opposite phenomena occur due to the eccentricity of the rotating member 20. Similarly, between the second one-side receiving coil group 303a and the second other-side receiving coil group 304a that are point-symmetric to each other with the rotation axis CL as the center and belong to the second system 306, opposite phenomena also occur due to the eccentricity of the rotating member 20.

[0126] Therefore, by using the case where the above opposite phenomena occur in the first system 305, in the first system 305, a structure that can withstand the eccentricity of the rotating member 20 can be easily obtained. Moreover, by using the case where the above opposite phenomena occur in the second system 306, in the second system 306, a structure that can withstand the eccentricity of the rotating member 20 can also be easily obtained.

[0127] For example, in the present embodiment, in the first system 305, the two first receiving coils 34 and 36 are connected in series as described above. Therefore, between these two first receiving coils 34 and 36, the influence of the eccentricity of the rotating member 20 on the coil output is canceled out. Similarly, between the two second receiving coils 35 and 37 connected in series, the influence of the eccentricity of the rotating member 20 on the coil output is also canceled out. This also applies to the second system 306. Therefore, as described above, in the first system 305, a structure resistant to the eccentricity of the rotating member 20 can be easily obtained, and in the second system 306 as well, a structure resistant to the eccentricity of the rotating member 20 can be easily obtained.

[0128] In addition, compared with the position detection device 1 of the present embodiment, the angular position sensor shown in the above-mentioned Patent Document 1 can be considered to be less resistant to the eccentricity of the rotating member. This is because, in the angular position sensor of Patent Document 1, between the two receiving coils arranged with the rotation axis in between, a structure that cancels out the influence of the eccentricity of the rotating member on the coil output is not adopted.

[0129] Furthermore, according to the present embodiment, as Figure 2 , Figure 5 shown, all the transmitting and receiving coils 31, 32, 34 to 37, 40 to 43 are formed on a single substrate 30, and all the targets 22 to 25 are arranged on one side with respect to the substrate 30 in the component axial direction Da. Therefore, for example, compared with a structure in which the first targets 22 and 23 are arranged on one side of the substrate 30 in the component axial direction Da and the second targets 24 and 25 are arranged on the other side of the substrate 30 in the component axial direction Da, the volume of the position detection device 1 can be reduced.

[0130] (Second Embodiment)

[0131] Next, the second embodiment will be described. In the present embodiment, the description will mainly focus on the points different from the above-mentioned first embodiment. In addition, the parts that are the same or equivalent to the above-mentioned embodiment will be omitted or briefly described. This also applies to the description of the following embodiments.

[0132] As Figure 10 shown, in the present embodiment, the pattern shapes of the receiving coils 34 to 37, 40 to 43 are different from those of the first embodiment. Therefore, in the present embodiment, the spiral portions 34a to 43b of the first embodiment (refer to Figure 5 ) are not provided.

[0133] In addition, in the present embodiment as well as in the first embodiment, when viewed in the direction along the component axis Da, all of the receiving coils 34 to 37, 40 to 43 are arranged inside the first transmitting coil 31 and inside the second transmitting coil 32. Moreover, the respective receiving coils 34 to 37, 40 to 43 are formed by being appropriately connected via via holes 30d in different wiring layers so as not to interfere with each other (i.e., not to overlap).

[0134] In the present embodiment, the respective receiving coils 34 to 37, 40 to 43 are formed by connecting two adjacent wiring layers among the sequentially stacked wiring layers with via holes 30d. For example, in the present embodiment, the respective receiving coils 34 to 37, 40 to 43 are formed by connecting the outermost wiring layer on the other surface 30b side of the substrate 30 to the wiring layer that is the next layer below the outermost layer. Regarding Figure 10 the display of the respective receiving coils 34 to 37, 40 to 43 in, the wiring layer formed on the outermost surface in the substrate 30 is shown by a solid line, and the wiring layer formed on the layer next below the outermost layer is shown by a dotted line. In addition, the transmitting coils 31, 32 are all shown by solid lines.

[0135] Specifically, the first one-sided receiving coil 34 has a first wave portion 34d and a second wave portion 34e. When viewed in the direction along the component axis Da, the first and second wave portions 34d, 34e each have a pattern shape of a curve depicting a sine wave. And the first and second wave portions 34d, 34e are connected in series via a connecting wiring pattern, for example, to form a closed loop.

[0136] In addition, the second one-sided receiving coil 35 has a first wave portion 35d and a second wave portion 35e. When viewed in the direction along the component axis Da, the first and second wave portions 35d, 35e each have a pattern shape of a curve depicting a sine wave that is phase-shifted in the circumferential direction Dc of the component with respect to the first and second wave portions 34d, 34e of the first one-sided receiving coil 34. Moreover, the first and second wave portions 35d, 35e are connected in series via a connecting wiring pattern, for example, to form a closed loop. For example, the wave portions 34d, 34e, 35d, 35e of the first and second one-sided receiving coils 34, 35 are arranged so as to overlap the first one-sided target 22 on one side in the component axis Da at any position within the operation range W1a of the first one-sided target 22.

[0137] Regarding other receiving coil groups 302a, 303a, and 304a other than the first one-sided receiving coil group 301a including the above-described receiving coils 34 and 35, the same applies. That is, when viewed in the direction along the component axial direction Da, the first other-sided receiving coil 36 has a pattern shape of a curve depicting a sine wave and has a first wave-shaped portion 36d and a second wave-shaped portion 36e that are connected in series with each other. In addition, when viewed in the direction along the component axial direction Da, the second other-sided receiving coil 37 has a pattern shape of a curve depicting a sine wave that is phase-shifted in the component circumferential direction Dc with respect to the first and second wave-shaped portions 36d and 36e and has a first wave-shaped portion 37d and a second wave-shaped portion 37e that are connected in series with each other. For example, the wave-shaped portions 36d, 36e, 37d, and 37e of the first and second other-sided receiving coils 36 and 37 are arranged so as to overlap the first other-sided target 23 on one side in the component axial direction Da at any position within the operation range W1b of the first other-sided target 23.

[0138] In addition, when viewed in the direction along the component axial direction Da, the third one-sided receiving coil 40 has a pattern shape of a curve depicting a sine wave and has a first wave-shaped portion 40d and a second wave-shaped portion 40e that are connected in series with each other. In addition, when viewed in the direction along the component axial direction Da, the fourth one-sided receiving coil 41 has a pattern shape of a curve depicting a sine wave that is phase-shifted in the component circumferential direction Dc with respect to the above-described first and second wave-shaped portions 40d and 40e and has a first wave-shaped portion 41d and a second wave-shaped portion 41e that are connected in series with each other. For example, the wave-shaped portions 40d, 40e, 41d, and 41e of the third and fourth one-sided receiving coils 40 and 41 are arranged so as to overlap the second one-sided target 24 on one side in the component axial direction Da at any position within the operation range W2a of the second one-sided target 24.

[0139] In addition, when viewed in the direction along the component axial direction Da, the third other-sided receiving coil 42 has a pattern shape of a curve depicting a sine wave and has a first wave-shaped portion 42d and a second wave-shaped portion 42e that are connected in series with each other. In addition, when viewed in the direction along the component axial direction Da, the fourth other-sided receiving coil 43 has a pattern shape of a curve depicting a sine wave that is phase-shifted in the component circumferential direction Dc with respect to the above-described first and second wave-shaped portions 42d and 42e and has a first wave-shaped portion 43d and a second wave-shaped portion 43e that are connected in series with each other. For example, the wave-shaped portions 42d, 42e, 43d, and 43e of the third and fourth other-sided receiving coils 42 and 43 are arranged so as to overlap the second other-sided target 25 on one side in the component axial direction Da at any position within the operation range W2b of the second other-sided target 25.

[0140] In addition, in the present embodiment, the circumferential one - end position P1 of the first one - side receiving region 301 coincides with the end position on one side of the second one - side receiving coil 35 on the component circumferential direction Dc. Also, the circumferential other - end position P2 of the first one - side receiving region 301 coincides with the end position on the other side of the second one - side receiving coil 35 on the component circumferential direction Dc. The same relationship holds for the first other - side receiving region 302, the second one - side receiving region 303, and the second other - side receiving region 304.

[0141] (1) As described above, according to the present embodiment, each of the corrugated portions 34d - 43e of the receiving coils 34 - 37, 40 - 43 has a pattern shape of a curve depicting a sine - wave shape when viewed in the direction along the component axial direction Da. Therefore, electrical signals having a phase difference, either sine waves or cosine waves, can be output from the receiving coils 34 - 37, 40 - 43. Additionally, the above - mentioned corrugated portions 34d - 43e refer to the corrugated portions 34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, 43e.

[0142] Except for the content described above, the present embodiment is the same as the first embodiment. And in the present embodiment, the effects achieved by the structure common to the above - mentioned first embodiment can be obtained in the same way as in the first embodiment.

[0143] (Third Embodiment)

[0144] Next, the third embodiment will be described. In the present embodiment, the description will mainly focus on the differences from the above - mentioned first embodiment.

[0145] As Figure 11 shown, the substrate 30 of the present embodiment has two first transmitting coils 311, 312 instead of the first transmitting coil 31 of the first embodiment (refer to Figure 5 ), and has two second transmitting coils 321, 322 instead of the second transmitting coil 32 of the first embodiment (refer to Figure 5 ).

[0146] These two first transmitting coils 311, 312 are the first one - side transmitting coil 311 and the first other - side transmitting coil 312. In addition, the two second transmitting coils 321, 322 are the second one - side transmitting coil 321 and the second other - side transmitting coil 322.

[0147] The first one - side transmitting coil 311 and the first other - side transmitting coil 312 are connected in series. Therefore, for example, when a current flows through the first one - side transmitting coil 311, at the same time, the current also flows through the first other - side transmitting coil 312. At this time, the direction of the current flowing through the first one - side transmitting coil 311 around the first one - side receiving coil group 301a is the same as the direction of the current flowing through the first other - side transmitting coil 312 around the first other - side receiving coil group 302a. In short, if the current flows clockwise in the first one - side transmitting coil 311, the current also flows clockwise in the first other - side transmitting coil 312; if the current flows counter - clockwise in the first one - side transmitting coil 311, the current also flows counter - clockwise in the first other - side transmitting coil 312.

[0148] Moreover, the second one - side transmitting coil 321 and the second other - side transmitting coil 322 are also connected in series. Therefore, for example, when a current flows through the second one - side transmitting coil 321, at the same time, the current also flows through the second other - side transmitting coil 322. At this time, the direction of the current flowing through the second one - side transmitting coil 321 around the second one - side receiving coil group 303a is the same as the direction of the current flowing through the second other - side transmitting coil 322 around the second other - side receiving coil group 304a. In short, if the current flows clockwise in the second one - side transmitting coil 321, the current also flows clockwise in the second other - side transmitting coil 322; if the current flows counter - clockwise in the second one - side transmitting coil 321, the current also flows counter - clockwise in the second other - side transmitting coil 322.

[0149] In addition, when observing in the direction along the component axis Da, the first and second one - side receiving coils 34 and 35 are arranged inside the first one - side transmitting coil 311, while the other receiving coils 36, 37, 40 - 43 are arranged outside the first one - side transmitting coil 311. Therefore, if an alternating current flows in the first one - side transmitting coil 311, due to the electromagnetic induction caused by energizing the first one - side transmitting coil 311, induced currents flow in the first and second one - side receiving coils 34 and 35.

[0150] In addition, when observing in the direction along the component axis Da, the first and second other - side receiving coils 36 and 37 are arranged inside the first other - side transmitting coil 312, while the other receiving coils 34, 35, 40 - 43 are arranged outside the first other - side transmitting coil 312. Therefore, if an alternating current flows in the first other - side transmitting coil 312, due to the electromagnetic induction caused by energizing the first other - side transmitting coil 312, induced currents flow in the first and second other - side receiving coils 36 and 37.

[0151] In addition, when viewed in the direction along the axial direction Da of the component, the third and fourth first receiving coils 40 and 41 are arranged inside the second first transmitting coil 321, while the other receiving coils 34 to 37, 42, and 43 are arranged outside the second first transmitting coil 321. Therefore, when an alternating current flows through the second first transmitting coil 321, induced currents flow through the third and fourth first receiving coils 40 and 41 due to electromagnetic induction caused by energizing the second first transmitting coil 321.

[0152] In addition, when viewed in the direction along the axial direction Da of the component, the third and fourth second receiving coils 42 and 43 are arranged inside the second second transmitting coil 322, while the other receiving coils 34 to 37, 40, and 41 are arranged outside the second second transmitting coil 322. Therefore, when an alternating current flows through the second second transmitting coil 322, induced currents flow through the third and fourth second receiving coils 42 and 43 due to electromagnetic induction caused by energizing the second second transmitting coil 322.

[0153] Moreover, the plurality of transmitting coils 311, 312, 321, and 322 are arranged at intervals from one side to the other side in the circumferential direction Dc of the component in the order of the first first transmitting coil 311, the second second transmitting coil 322, the first second transmitting coil 312, and the second first transmitting coil 321. The shapes of these transmitting coils 311, 312, 321, and 322 are each fan-shaped, and the transmitting coils 311, 312, 321, and 322 are arranged as a whole in a ring shape centered on the rotation axis CL.

[0154] Except for the above-described content, the first first transmitting coil 311 and the first second transmitting coil 312 are the same as the first transmitting coil 31 of the first embodiment, and the second first transmitting coil 321 and the second second transmitting coil 322 are the same as the second transmitting coil 32 of the first embodiment.

[0155] (1) With the above-described structures of the transmitting coils 311, 312, 321, and 322, electromagnetic induction for the receiving coils can be generated for each of the receiving coil groups 301a, 302a, 303a, and 304a.

[0156] In addition, in the present embodiment, each of the transmitting coils 311, 312, 321, and 322 may also be formed on the same wiring layer of the substrate 30.

[0157] Except for the above-described content, the present embodiment is the same as the first embodiment. Moreover, in the present embodiment, the effects achieved by the structure common to the above-described first embodiment can be obtained in the same manner as in the first embodiment.

[0158] (Fourth Embodiment)

[0159] Next, the fourth embodiment will be described. In this embodiment, the description will mainly focus on the points different from the above-described third embodiment.

[0160] As Figure 12 shown, each of the receiving coils 34 to 37, 40 to 43 in this embodiment has the pattern shape of the second embodiment instead of the pattern shape of the third embodiment.

[0161] That is, in this embodiment, the spiral portions 34a to 43b (refer to Figure 11 ) are not provided. Instead, the first one-sided receiving coil 34 has the same first wavy portion 34d and second wavy portion 34e as in the second embodiment, and the second one-sided receiving coil 35 has the same first wavy portion 35d and second wavy portion 35e as in the second embodiment. In addition, the first other-sided receiving coil 36 has the same first wavy portion 36d and second wavy portion 36e as in the second embodiment, and the second other-sided receiving coil 37 has the same first wavy portion 37d and second wavy portion 37e as in the second embodiment.

[0162] Furthermore, the third one-sided receiving coil 40 has the same first wavy portion 40d and second wavy portion 40e as in the second embodiment, and the fourth one-sided receiving coil 41 has the same first wavy portion 41d and second wavy portion 41e as in the second embodiment. In addition, the third other-sided receiving coil 42 has the same first wavy portion 42d and second wavy portion 42e as in the second embodiment, and the fourth other-sided receiving coil 43 has the same first wavy portion 43d and second wavy portion 43e as in the second embodiment.

[0163] Except for the above-described content, this embodiment is the same as the third embodiment. And in this embodiment, the effects achieved by the structure common to the above-described third embodiment can be obtained in the same manner as in the third embodiment.

[0164] (Fifth Embodiment)

[0165] Next, the fifth embodiment will be described. In this embodiment, the description will mainly focus on the points different from the above-described first embodiment.

[0166] As Figure 13 shown, the first signal processing unit 47 includes a first fault detection unit 473, and the second signal processing unit 48 includes a second fault detection unit 483. In this embodiment, this is different from the first embodiment.

[0167] Specifically, the first fault detection unit 473 performs the control processing as Figure 14 shown. Figure 14The flowchart is repeatedly executed periodically.

[0168] As Figure 14 shown, first in step S01, the first fault detection unit 473 obtains detection signals output from two first receiving coils 34 and 36 connected in series from the receiving unit 472. At the same time, the first fault detection unit 473 also obtains detection signals output from two second receiving coils 35 and 37 connected in series from the receiving unit 472. As Figure 9 shown, the magnitude of the detection signal output from the first receiving coils 34 and 36 is specifically the first voltage value V1, and the magnitude of the detection signal output from the second receiving coils 35 and 37 is specifically the second voltage value V2.

[0169] Here, as described above, the first voltage value V1 changes in a sine wave shape with respect to the electrical angle θ corresponding to the rotational position of the rotating member 20, and the second voltage value V2 changes in a cosine wave shape with respect to the electrical angle θ synchronously with the first voltage value V1. In short, the first voltage value V1 and the second voltage value V2 change with respect to the electrical angle θ as Figure 9 shown. Based on this situation and the following formula F1 which is a formula of trigonometric functions, it can be considered that if there is no error in each detection signal, even if the electrical angle θ changes, the determination value Vx calculated according to the following formula F2 is a constant value.

[0170] sin 2 θ + cos 2 θ = 1 …(F1)

[0171] Vx = V1 2 + V2 2 …(F2)

[0172] Therefore, in Figure 14 step S01, based on the first voltage value V1 and the second voltage value V2, the determination value Vx is calculated according to the above formula F2. After step S01, it proceeds to step S02.

[0173] In step S02, the first fault detection unit 473 detects a fault based on the determination value Vx. Specifically, the fault detected in this step S02 refers to a fault in a component related to the detection signal output from the first receiving coils 34 and 36 or the detection signal output from the second receiving coils 35 and 37 in the position detection device 1.

[0174] Specifically, as described above, ideally the determination value Vx does not change with respect to the electrical angle θ. Therefore, when the change of the determination value Vx with respect to the electrical angle θ exceeds a specified limit, the first fault detection unit 473 determines that a fault has occurred. In other words, the first fault detection unit 473 determines that a fault has been detected.

[0175] For example, it may also be determined that a failure is detected when the determination value Vx calculated according to the above formula F2 deviates from a specified allowable range including the ideal value of the determination value Vx. The ideal value of the determination value Vx is the determination value Vx when there is no error between the first voltage value V1 and the second voltage value V2. Alternatively, it may also be determined that a failure is detected when the ratio of the change (i.e., the change rate) of the determination value Vx calculated according to the above formula F2 with respect to the electrical angle θ exceeds a specified limit value.

[0176] In step S02, if it is determined that a failure is detected, the process proceeds to S03. On the other hand, if it is not determined that a failure is detected, this process ends and starts again from step S01.

[0177] In step S03, the first failure detection unit 473 outputs the fact that a failure has been detected. The output for the detection of this failure is input to the external electronic control device 72 via the first terminal 49.

[0178] The detection of the failure based on the first voltage value V1 and the second voltage value V2 is as described above. In addition, Figure 13 The operation of the second failure detection unit 483 shown is the same as the operation of the above-mentioned first failure detection unit 473, so the description of the operation of the second failure detection unit 483 is omitted.

[0179] (1) As described above, according to the present embodiment, Figure 13 the first failure detection unit 473 detects a failure based on the determination value Vx obtained from the above formula F2. Therefore, a failure can be detected without additional construction. For example, without increasing the size of the substrate 30, a higher functional safety can be set. Moreover, the number of patterns required for failure detection is not increased, so it is easy to increase the pattern area of each receiving coil, and it is possible to ensure the amplitude of the detection signal and improve the robustness against eccentricity of the rotating member 20.

[0180] Here, in order to illustrate the effects of the present embodiment, the following first comparative example is considered. For example, in this first comparative example, as shown by the dashed line L1 in Figure 15 , the first sensor output from the first system 305 increases as the rotation angle of the rotating member 20 increases. Moreover, as shown by the solid line L2 in Figure 15 , the second sensor output from the second system 306 decreases as the rotation angle of the rotating member 20 increases. In short, the first sensor output and the second sensor output are set to have a mutually opposite correlation with respect to the rotation angle of the rotating member 20.

[0181] In the case of such a first comparative example, if the sum of the first sensor output and the second sensor output is normal and has no error, it becomes a constant value. Therefore, by monitoring the sum of the first and second sensor outputs, it is possible to detect a failure (in other words, determine an abnormality). However, in the first comparative example, although it is possible to detect a failure, when a failure is detected, it is impossible to determine which of the first and second sensor outputs is the normal value.

[0182] In contrast, in the present embodiment, it is possible to determine whether a failure has occurred in each of the first system 305 and the second system 306. Therefore, even when a failure is detected in one of the first system 305 and the second system 306, it is possible to detect the rotation angle of the rotating member 20 by the normal other party.

[0183] Except for the content described above, the present embodiment is the same as the first embodiment. And, in the present embodiment, it is possible to obtain the effects achieved by the structure common to the first embodiment in the same manner as the first embodiment.

[0184] In addition, although the present embodiment is a modification based on the first embodiment, the present embodiment can also be combined with any one of the second to fourth embodiments described above.

[0185] (Sixth Embodiment)

[0186] Next, the sixth embodiment will be described. In the present embodiment, the description will be mainly focused on the points different from the first embodiment described above.

[0187] As Figures 16 to 18 shown, in the present embodiment, the rotating member 20 of the first embodiment (refer to Figure 1 ) has a two-component structure. That is, in the present embodiment, the position detection device 1 includes a first target member 16 and a second target member 18 combined with each other instead of the rotating member 20 of the first embodiment. The entire first target member 16 and second target member 18 of the present embodiment are equivalent to the rotating member 20 of the first embodiment, so the rotation axis CL is the rotation center of the first target member 16 and the second target member 18. In addition, the first target member 16 and the second target member 18 are made of metal in the same manner as the rotating member 20 of the first embodiment.

[0188] In addition, the shape of the whole formed by combining the first target member 16 and the second target member 18 of the present embodiment is the same as that of the rotating member 20 of the first embodiment when viewed in the direction along the component axis Da. For example, when viewed in the direction along the component axis Da, the shapes and arrangements of the respective targets 22 to 25 are the same as those of the first embodiment. Figure 16 It is shown Figure 17Cross-sectional view of the XVI-XVI section.

[0189] The first target member 16 has a first connecting portion 161 and two first targets 22, 23. In addition, the second target member 18 has a second connecting portion 181 and two second targets 24, 25. For example, the first target member 16 is configured as a single member including the first connecting portion 161 and two first targets 22, 23, and the second target member 18 is configured as a single member including the second connecting portion 181 and two second targets 24, 25.

[0190] The first connecting portion 161 and the second connecting portion 181 as a whole correspond to the connecting portion 21 of the first embodiment. Specifically, the first connecting portion 161 is disposed at the central portion in the first target member 16 and has an annular shape centered on the rotation axis CL. Moreover, the two first targets 22, 23 are respectively formed to protrude outward from the first connecting portion 161 in the radial direction Dr of the member and are disposed outside the second connecting portion 181 in the radial direction Dr of the member. A first insertion hole 161a penetrating the first connecting portion 161 in the axial direction Da of the member is formed inside the first connecting portion 161, and the rotating shaft 70 is inserted into the first insertion hole 161a. Thus, the first connecting portion 161 is connected to the rotating shaft 70 in a non-rotatable manner without passing through the second target member 18.

[0191] In addition, the second connecting portion 181 is stacked on one side of the first connecting portion 161 in the axial direction Da of the member. Moreover, the second connecting portion 181 has the same shape as the first connecting portion 161 when viewed in the direction along the axial direction Da of the member.

[0192] That is, the second connecting portion 181 is disposed at the central portion in the second target member 18 and has an annular shape centered on the rotation axis CL. Moreover, the two second targets 24, 25 are respectively formed to protrude outward from the second connecting portion 181 in the radial direction Dr of the member and are disposed outside the first connecting portion 161 in the radial direction Dr of the member. A second insertion hole 181a penetrating the second connecting portion 181 in the axial direction Da of the member is formed inside the second connecting portion 181.

[0193] The second insertion hole 181a is concentric and of the same diameter as the first insertion hole 161a and is arranged to be continuously connected to the first insertion hole 161a in the axial direction Da of the member. In short, the first insertion hole 161a and the second insertion hole 181a form a through hole by being arranged in series. Moreover, the rotating shaft 70 is also inserted into the second insertion hole 181a in the same manner as the first insertion hole 161a. Thus, the second connecting portion 181 is connected to the rotating shaft 70 in a non-rotatable manner without passing through the first target member 16.

[0194] Specifically, the rotating shaft 70 has a cylindrical shaft body 701 and two protruding portions 702b and 702c. The shaft body 701 is the portion of the rotating shaft 70 that is embedded and received inside the first embedding hole 161a and the second embedding hole 181a. One side protruding portion 702b of the two protruding portions 702b and 702c, and the other side protruding portion 702c of the two protruding portions 702b and 702c protrude from the shaft body 701 to the outside in the component radial direction Dr. The one side protruding portion 702b and the other side protruding portion 702c each have a rectangular cross section and extend in the component axial direction Da, and are arranged at intervals from each other in the component circumferential direction Dc. For example, the two protruding portions 702b and 702c may be integrally formed with the shaft body 701, or may be constituted by key components embedded in key grooves provided in the shaft body 701.

[0195] In addition, in the first connection portion 161, in addition to forming the above-mentioned first embedding hole 161a, two first embedding grooves 161b and 161c connected to the first embedding hole 161a are also formed. One of the two first embedding grooves 161b and 161c is called the first one-sided embedding groove 161b, and the other of the two first embedding grooves 161b and 161c is called the first other-sided embedding groove 161c. When observed in the direction along the component axial direction Da, the two first embedding grooves 161b and 161c are each formed in a groove shape that is recessed from the first embedding hole 161a to the outside in the component radial direction Dr, and are arranged at intervals from each other in the component circumferential direction Dc.

[0196] Similarly, in the second connection portion 181, in addition to forming the above-mentioned second embedding hole 181a, two second embedding grooves 181b and 181c connected to the second embedding hole 181a are also formed. One of the two second embedding grooves 181b and 181c is called the second one-sided embedding groove 181b, and the other of the two second embedding grooves 181b and 181c is called the second other-sided embedding groove 181c. When observed in the direction along the component axial direction Da, the two second embedding grooves 181b and 181c are each formed in a groove shape that is recessed from the second embedding hole 181a to the outside in the component radial direction Dr, and are arranged at intervals from each other in the component circumferential direction Dc.

[0197] Furthermore, when viewed in the direction along the axial direction Da of the component, the second first-side insertion groove 181b is arranged in the same shape and in the same manner relative to the first first-side insertion groove 161b, and the second second-side insertion groove 181c is arranged in the same shape and in the same manner relative to the first second-side insertion groove 161c. In short, the first first-side insertion groove 161b and the second first-side insertion groove 181b are arranged in series, and thus are arranged in a manner that continuously connects in the axial direction Da of the component, forming a groove extending along the axial direction Da of the component. Similarly, the first second-side insertion groove 161c and the second second-side insertion groove 181c are also arranged in series, and thus are arranged in a manner that continuously connects in the axial direction Da of the component, forming a groove extending along the axial direction Da of the component.

[0198] Moreover, the one-side protrusion 702b of the rotating shaft 70 is inserted into the first first-side insertion groove 161b and the second first-side insertion groove 181b, and the other-side protrusion 702c of the rotating shaft 70 is inserted into the first second-side insertion groove 161c and the second second-side insertion groove 181c.

[0199] In the first target component 16, the opposing surfaces 22a of the first first-side target 22 and the opposing surfaces 23a of the first second-side target 23 are respectively arranged on the side closer to the axial direction Da of the component than the first connecting portion 161. Therefore, a step is formed in the axial direction Da between the opposing surface 22a of the first first-side target 22 and the first connecting portion 161, and a step is also formed in the axial direction Da between the opposing surface 23a of the first second-side target 23 and the first connecting portion 161.

[0200] Thus, in the present embodiment as well, similar to the first embodiment, the axial intervals AG between the substrate 30 and the opposing surfaces 22a, 23a, 24a, 25a of the four targets 22 to 25 are mutually consistent. In other words, the axial interval AG has the same size between each of the substrate 30 and the opposing surfaces 22a, 23a, 24a, 25a of the four targets 22 to 25.

[0201] In addition, similar to the first embodiment, in the present embodiment as well, the thicknesses of the four targets 22 to 25 in the axial direction Da of the component are of the same size as each other.

[0202] (1) As described above, according to the present embodiment, the first target component 16 including the two first targets 22 and 23 is connected to the rotating shaft 70 in a non-rotatable manner without passing through the second target component 18. And the second target component 18 including the two second targets 24 and 25 is connected to the rotating shaft 70 in a non-rotatable manner without passing through the first target component 16.

[0203] Therefore, for example, compared with the case where the four targets 22 to 25 are included in a single component, it is possible to reduce or prevent the influence of a failure of one of the first targets 22 and 23 and the second targets 24 and 25 on the other. Thereby, the redundancy of the position detection device 1 can be improved.

[0204] For example, as a failure of the first and second target members 16 and 18, it is assumed that the position of the target deviates by several degrees from the normal due to wear, and the axial distance AG between the target and the substrate 30 changes from the normal. Even if such a failure occurs in one of the first and second target members 16 and 18, this failure is not likely to affect the other target member, and the rotational position of the rotating shaft 70 can be detected by the other target member.

[0205] In addition, as a failure of one of the first and second target members 16 and 18, in addition to the above-mentioned wear, minute deformation of the one target member, minute deviation in the circumferential direction Dc of the member, etc. are also assumed. In such a case, this failure is not likely to affect the other target member, and the rotational position of the rotating shaft 70 can be detected by the other target member.

[0206] (2) Further, according to the present embodiment, the first insertion hole 161a and the second insertion hole 181a are arranged so as to be connected to each other in the member axial direction Da. The first one-side insertion groove 161b and the second one-side insertion groove 181b are also arranged so as to be connected to each other in the member axial direction Da, and the first other-side insertion groove 161c and the second other-side insertion groove 181c are also arranged so as to be connected to each other in the member axial direction Da. Moreover, the one-side protrusion 702b of the rotating shaft 70 is inserted into the first one-side insertion groove 161b and the second one-side insertion groove 181b, and the other-side protrusion 702c of the rotating shaft 70 is inserted into the first other-side insertion groove 161c and the second other-side insertion groove 181c.

[0207] Therefore, the first target member 16 is connected to the rotating shaft 70 in a non-rotatable manner without passing through the second target member 18, and the second target member 18 is connected to the rotating shaft 70 in a non-rotatable manner without passing through the first target member 16. And a structure in which the first and second target members 16 and 18 are connected to the rotating shaft 70 can be realized with a simple structure.

[0208] (3) Further, according to the present embodiment, the opposing surfaces 22a, 23a of the two first targets 22, 23 are respectively arranged on the side closer to the component axial direction Da than the first connecting portion 161. Thereby, the axial intervals AG between the substrate 30 and the opposing surfaces 22a, 23a of the first targets 22, 23, and the axial intervals AG between the substrate 30 and the opposing surfaces 24a, 25a of the second targets 24, 25 are made to coincide with each other. Therefore, the first target member 16 and the second target member 18 can be combined and easily mounted on the rotation axis 70, and the outputs of the respective receiving coils 34 to 37, 40 to 43 can be made to have the same magnitude.

[0209] Except for the content described above, the present embodiment is the same as the first embodiment. And, in the present embodiment, the effects achieved by the structure common to the above-described first embodiment can be obtained in the same manner as in the first embodiment.

[0210] In addition, although the present embodiment is a modification based on the first embodiment, the present embodiment can also be combined with any one of the above-described second to fifth embodiments.

[0211] (Seventh Embodiment)

[0212] Next, the seventh embodiment will be described.

[0213] The angular position sensor described in Patent Document 1 detects the rotational position of a rotating member as a detection object that rotates about a rotation axis using electromagnetic induction. Specifically, the angular position sensor of Patent Document 1 includes a pair of transmission coils that generate an alternating magnetic field and a pair of receiving coil groups.

[0214] Each of the pair of receiving coil groups includes a plurality of receiving coils, and one receiving coil group in the pair is arranged on the opposite side of the other receiving coil group with the rotation axis interposed therebetween. Moreover, one of the pair of transmission coils is formed to surround the one receiving coil group, and the other of the pair of transmission coils is formed to surround the other receiving coil group.

[0215] Here, for a position detection device such as the angular position sensor of Patent Document 1, there may be a problem that the rotating member is eccentric with respect to the substrate having the transmission coils and the receiving coils.

[0216] However, in the angular position sensor of Patent Document 1, no countermeasure is taken against the eccentricity of the rotating member with respect to the substrate. Therefore, the eccentricity of the rotating member has a great influence on the output of the angular position sensor indicating the rotational position of the rotating member. For example, the eccentricity of the rotating member causes a decrease in the detection accuracy of the rotational position of the rotating member.

[0217] In contrast, in the present embodiment, a structure can be easily obtained that can reduce the influence of the eccentricity of the rotating member on the output of the position detection device indicating the rotational position of the rotating member. In short, a structure resistant to the eccentricity of the rotating member can be easily obtained.

[0218] Specifically, the present embodiment is the same as the first embodiment. Therefore, in the present embodiment, the effects achieved by the structure common to the above-described first embodiment can be obtained in the same manner as in the first embodiment.

[0219] (Summary of the Seventh Embodiment)

[0220] The seventh embodiment is configured as described above. Therefore, in summary, it can be said that the seventh embodiment has the following viewpoints.

[0221] [Viewpoint 1]

[0222] A position detection device includes: rotating members (16, 18, 20) having a first one-sided target (22), a first other-sided target (23), a second one-sided target (24), and a second other-sided target (25), and rotating about a specified rotation axis (CL); and a substrate (30) having a first transmission coil (31, 311, 312), a second transmission coil (32, 321, 322), a first one-sided receiving coil (34) and a second one-sided receiving coil (35) that generate an induced electromotive force corresponding to the position of the first one-sided target by electromagnetic induction caused by energizing the first transmission coil and constitute a first one-sided receiving coil group (301a), a first other-sided receiving coil (36) and a second other-sided receiving coil (37) that generate an induced electromotive force corresponding to the position of the first other-sided target by electromagnetic induction caused by energizing the first transmission coil and constitute a first other-sided receiving coil group (302a), a third one-sided receiving coil (40) and a fourth one-sided receiving coil (41) that generate an induced electromotive force corresponding to the position of the second one-sided target by electromagnetic induction caused by energizing the second transmission coil and constitute a second one-sided receiving coil group (303a), and a third other-sided receiving coil (42) and a fourth other-sided receiving coil (43) that generate an induced electromotive force corresponding to the position of the second other-sided target by electromagnetic induction caused by energizing the second transmission coil and constitute a second other-sided receiving coil group (304a). The substrate (30) faces the first one-sided target, the first other-sided target, the second one-sided target, and the second other-sided target. Assuming that the axial direction (Da) of the rotation axis is the normal direction, and the substrate (30) is arranged on one side of the axial direction with respect to the first one-sided target, the first other-sided target, the second one-sided target, and the second other-sided target. The first one-sided receiving coil and the first other-sided receiving coil are connected in series in a direction that strengthens each other's induced electromotive force. The second one-sided receiving coil and the second other-sided receiving coil are connected in series in a direction that strengthens each other's induced electromotive force. The third one-sided receiving coil and the third other-sided receiving coil are connected in series in a direction that strengthens each other's induced electromotive force. The fourth one-sided receiving coil and the fourth other-sided receiving coil are connected in series in a direction that strengthens each other's induced electromotive force. The first one-sided target is arranged on the opposite side of the rotation axis with respect to the first other-sided target. The second one-sided target is arranged on the opposite side of the rotation axis with respect to the second other-sided target. The first one-sided receiving coil group is arranged on the opposite side of the rotation axis with respect to the first other-sided receiving coil group. The second one-sided receiving coil group is arranged on the opposite side of the rotation axis with respect to the second other-sided receiving coil group.

[0223] Thus, between the receiving coils connected in series with each other as described above, the influence of the eccentricity of the rotating member on the coil output of the receiving coil is canceled out respectively. Therefore, a structure resistant to the eccentricity of the rotating member can be easily obtained.

[0224] [Viewpoint 2]

[0225] According to the position detection device described in Viewpoint 1, when viewed in the direction along the axial direction, the first one receiving coil, the first other receiving coil, the second one receiving coil, the second other receiving coil, the third one receiving coil, the third other receiving coil, the fourth one receiving coil, and the fourth other receiving coil are arranged inside the first transmitting coil and inside the second transmitting coil.

[0226] [Viewpoint 3]

[0227] According to the position detection device described in Viewpoint 1, two first transmitting coils are provided, and the two first transmitting coils include a first one transmitting coil (311) and a first other transmitting coil (312). Two second transmitting coils are also provided, and the two second transmitting coils include a second one transmitting coil (321) and a second other transmitting coil (322). When viewed in the direction along the axial direction, the first one receiving coil and the second one receiving coil are arranged inside the first one transmitting coil, and on the other hand, are arranged outside the first other transmitting coil, outside the second one transmitting coil, and outside the second other transmitting coil. When viewed in the direction along the axial direction, the first other receiving coil and the second other receiving coil are arranged inside the first other transmitting coil, and on the other hand, are arranged outside the first one transmitting coil, outside the second one transmitting coil, and outside the second other transmitting coil. When viewed in the direction along the axial direction, the third one receiving coil and the fourth one receiving coil are arranged inside the second one transmitting coil, and on the other hand, are arranged outside the first one transmitting coil, outside the first other transmitting coil, and outside the second other transmitting coil. When viewed in the direction along the axial direction, the third other receiving coil and the fourth other receiving coil are arranged inside the second other transmitting coil, and on the other hand, are arranged outside the first one transmitting coil, outside the first other transmitting coil, and outside the second one transmitting coil.

[0228] [Viewpoint 4]

[0229] The position detection device according to any one of Aspects 1 to 3, wherein the first one receiving coil, the first other receiving coil, the second one receiving coil, the second other receiving coil, the third one receiving coil, the third other receiving coil, the fourth one receiving coil, and the fourth other receiving coil each have a plurality of spiral portions (34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b) having a spiral pattern shape when viewed in the direction along the axial direction.

[0230] [Aspect 5]

[0231] The position detection device according to any one of Aspects 1 to 3, wherein the first one receiving coil, the first other receiving coil, the second one receiving coil, the second other receiving coil, the third one receiving coil, the third other receiving coil, the fourth one receiving coil, and the fourth other receiving coil each have a plurality of wavy portions (34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, 43e) having a pattern shape of a curve depicting a sine wave when viewed in the direction along the axial direction.

[0232] (Other Embodiments)

[0233] (1) In each of the above embodiments, the position detection device 1 is used, for example, to detect the rotational position of a brake pedal or an accelerator pedal for a vehicle, but the use of the position detection device 1 is not limited thereto, and various applications are envisioned. In addition, the position detection device 1 can also be used for applications other than those for vehicles.

[0234] (2) In each of the above embodiments, for example, as Figure 1 shown, the moving direction of the targets 22 to 25 is the circumferential direction Dc of the component, but this is only an example. For example, the targets 22 to 25 may linearly reciprocate, and the position detection device 1 may detect the position in the moving direction of the targets 22 to 25.

[0235] (3) In each of the above embodiments, as Figure 1 shown, all four targets 22 to 25 have the same sector shape, but this is only an example. The shape of the targets 22 to 25 may not be a sector shape, and the shapes of the targets 22 to 25 may also be different from each other.

[0236] (4) In each of the above embodiments, for example, as Figure 1As shown, the rotating member 20 has two first targets 22, 23, but it is also conceivable that only one of the two first targets 22, 23 is present and the other is not. Similarly, it is also conceivable that the rotating member 20 has only one of the two second targets 24, 25 and not the other. Furthermore, there may be three or more first targets 22, 23, and there may be three or more second targets 24, 25.

[0237] (5) In each of the above-described embodiments, as Figure 8 shown, the position detection device 1 includes, as a circuit, an independent first system 305 and a second system 306, but it may also include three or more systems having an independent structure as a circuit.

[0238] (6) In each of the above-described embodiments, for example, as Figure 5 shown, the first one-side receiving coil group 301a is arranged on the opposite side of the first other-side receiving coil group 302a with respect to the rotation axis CL interposed therebetween. Moreover, the first system 305 (see Figure 8 ) includes a pair of such receiving coil groups 301a, 302a arranged on both sides with the rotation axis CL interposed therebetween. However, this is an example, and it may also include two or more pairs of such receiving coil groups arranged on both sides with the rotation axis CL interposed therebetween. The same applies to the second system 306.

[0239] (7) In each of the above-described embodiments, the first system 305 includes the first one-side receiving coil group 301a and the first other-side receiving coil group 302a, but this is an example. For example, the first system 305 may also include only one of the first one-side receiving coil group 301a and the first other-side receiving coil group 302a and not the other. In this case, the waveform of the detection signal output from the first receiving coil belonging to the one-side receiving coil group also becomes a sine wave shape identical to the waveform of Figure 9 the first voltage value V1. Moreover, the waveform of the detection signal output from the second receiving coil belonging to the one-side receiving coil group becomes a cosine wave shape identical to the waveform of Figure 9 the second voltage value V2. Therefore, for example, the fault detection using Figure 14 the control process can be implemented in the same manner as in the fifth embodiment described above. The same applies to the second system 306.

[0240] (8) In the sixth embodiment described above, as Figure 16As shown, the one-side protrusion 702b and the other-side protrusion 702c each have a rectangular cross-section and extend in the component axial direction Da, but are not limited to having a rectangular cross-section. For example, as the cross-sectional shapes of the one-side protrusion 702b and the other-side protrusion 702c respectively, various cross-sectional shapes such as trapezoidal, polygonal, or semi-circular shapes are conceivable.

[0241] (9) In each of the above-described embodiments, an alternating current of the same frequency flows through the first transmission coil 31 and the second transmission coil 32, for example, but is not limited thereto. For example, if the directions of current flow in the first transmission coil 31 and the second transmission coil 32 are not opposite at the same timing, the currents may not be of the same frequency.

[0242] (10) In the above-described fifth embodiment, Figure 14 The processing of each step shown in the flowchart of [] is implemented by a computer program, but may also be implemented by hardware.

[0243] (11) Additionally, the present disclosure is not limited to the above-described embodiments and can be implemented with various modifications. Furthermore, the above-described embodiments are not mutually independent, and can be appropriately combined except in cases where obvious combinations are not possible.

[0244] Moreover, in each of the above-described embodiments, the elements constituting the embodiments are not necessarily essential except in cases where they are specifically indicated as essential and cases where they can be considered obviously essential in principle, etc. Further, in each of the above-described embodiments, when referring to numerical values such as the number, value, quantity, range, etc. of the constituent elements of the embodiments, they are not limited to the specific quantity except in cases where they are specifically indicated as essential and cases where they are clearly limited to a specific quantity in principle, etc. Additionally, in each of the above-described embodiments, when referring to the material, shape, positional relationship, etc. of the constituent elements, etc., they are not limited to the material, shape, positional relationship, etc. except in cases where they are specifically indicated and cases where they are limited to a specific material, shape, positional relationship, etc. in principle, etc.

[0245] In addition, the signal processing units 47 and 48 and their methods described in the present disclosure can also be implemented by a dedicated computer provided by a processor and a memory configured to execute one or more functions embodied by a computer program. The signal processing units 47 and 48 and their methods described in the present disclosure can also be implemented by a dedicated computer provided by a processor configured by one or more dedicated hardware logic circuits. Alternatively, the signal processing units 47 and 48 and their methods described in the present disclosure can also be implemented by one or more dedicated computers constituted by a combination of a processor configured to execute one or more functions and a memory and a processor constituted by one or more hardware logic circuits. In addition, the computer program can also be stored as instructions executable by a computer in a computer-readable non-transitory tangible recording medium.

[0246] (Viewpoint of the present disclosure)

[0247] Regarding the above-mentioned present disclosure, for example, it can be grasped as the viewpoints shown below.

[0248] [First viewpoint]

[0249] A position detection device includes: first targets (22, 23) that reciprocate in a prescribed moving direction (Dc); second targets (24, 25) that reciprocate in the moving direction together with the first targets; and a substrate (30) having first transmission coils (31, 311, 312), second transmission coils (32, 321, 322), first reception coils (34, 36), second reception coils (35, 37), third reception coils (40, 42), and fourth reception coils (41, 43). Inductive currents flow through the first reception coils (34, 36) and the second reception coils (35, 37) due to electromagnetic induction caused by energizing the first transmission coils, and detection signals (V1, V2) corresponding to the positions of the first targets are output. Inductive currents flow through the third reception coils (40, 42) and the fourth reception coils (41, 43) due to electromagnetic induction caused by energizing the second transmission coils, and detection signals corresponding to the positions of the second targets are output. The substrate faces the first targets and the second targets, and when the direction crossing the moving direction is set as the normal direction (Da), the substrate is disposed on one side of the normal direction with respect to the first targets and the second targets. A first reception area (301, 302) occupied by the first reception coils and the second reception coils in the substrate, and a second reception area (303, 304) occupied by the third reception coils and the fourth reception coils in the substrate are arranged and disposed in the moving direction. The first targets reciprocate within an operation range (W1a, W1b) where the first targets do not overlap with the other side of the second reception area on the side opposite to the one side in the normal direction.

[0250] [Second perspective]

[0251] For the position detection device described in the first perspective, the movement range of the first target is a range allocated in the movement direction centered on the central positions (301b, 302b) of the first reception area in the movement direction.

[0252] [Third perspective]

[0253] For the position detection device described in the first perspective or the second perspective, the first target reciprocates in the movement direction in such a manner that it does not exceed the range from the other side with respect to the end position (P1) on one side of the first reception area and the one side with respect to the end position (P2) on the other side of the first reception area.

[0254] [Fourth perspective]

[0255] For the position detection device described in any one of the first to third perspectives, when observed in the direction along the normal direction of the substrate, the first reception coil, the second reception coil, the third reception coil, and the fourth reception coil are arranged inside the first transmission coil and inside the second transmission coil.

[0256] [Fifth perspective]

[0257] For the position detection device described in any one of the first to third perspectives, when observed in the direction along the normal direction of the substrate, the first reception coil and the second reception coil are arranged inside the first transmission coil but outside the second transmission coil, and the third reception coil and the fourth reception coil are arranged inside the second transmission coil but outside the first transmission coil.

[0258] [Sixth perspective]

[0259] For the position detection device described in any one of the first to fifth perspectives, the first reception coil, the second reception coil, the third reception coil, and the fourth reception coil each have a plurality of spiral portions (34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b) having a spiral pattern shape when observed in the direction along the normal direction of the substrate.

[0260] [Seventh perspective]

[0261] The position detection device according to any one of the first aspect to the fifth aspect, wherein the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of wavy portions (34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, 43e) having a pattern shape of a curve depicting a sine wave when viewed in the direction along the normal line of the substrate.

[0262] [Eighth aspect]

[0263] The position detection device according to any one of the first aspect to the seventh aspect, comprising a failure detection unit (473, 483), which, when the magnitude of the detection signal output from the first receiving coil is set to V1 and the magnitude of the detection signal output from the second receiving coil is set to V2, detects a failure based on the value (Vx) obtained from V1 2 +V2 2 The detection signal of the first receiving coil changes in a sine wave shape with respect to the electrical angle (θ) corresponding to the position of the first target, and the detection signal of the second receiving coil changes in a cosine wave shape with respect to the electrical angle.

[0264] [Ninth aspect]

[0265] The position detection device according to any one of the first aspect to the eighth aspect, wherein the first target and the second target respectively form a part of a rotating member (16, 18, 20) that rotates about an axis (CL) having the normal direction as an axis, and the moving direction is the circumferential direction (Dc) of the axis.

[0266] [Tenth aspect]

[0267] In the position detection device according to the ninth aspect, two first targets are provided, and one of the two first targets (22) is arranged on the opposite side of the other first target (23) with respect to the axis, and two receiving coil groups (301a, 302a) formed as a combination of the first receiving coil and the second receiving coil are also provided, and one of the two receiving coil groups (301a) is arranged on the opposite side of the other receiving coil group (302a) with respect to the axis.

[0268] [Eleventh aspect]

[0269] The position detection device according to the tenth aspect, the first receiving coil (34) of the receiving coil group belonging to one of the parties is electrically connected to the first receiving coil (36) of the receiving coil group belonging to the other party, and the second receiving coil (35) of the receiving coil group belonging to one of the parties is also electrically connected to the second receiving coil (37) of the receiving coil group belonging to the other party.

[0270] [Twelfth aspect]

[0271] The position detection device according to the tenth aspect, the first receiving coil (34) of the receiving coil group belonging to one of the parties and the first receiving coil (36) of the receiving coil group belonging to the other party are connected in series in a direction in which the induced electromotive forces generated by the electromagnetic induction of the first transmitting coil reinforce each other, and the second receiving coil (35) of the receiving coil group belonging to one of the parties and the second receiving coil (37) of the receiving coil group belonging to the other party are connected in series in a direction in which the induced electromotive forces generated by the electromagnetic induction of the first transmitting coil reinforce each other.

[0272] [Thirteenth aspect]

[0273] The position detection device according to any one of the first aspect to the twelfth aspect includes: a first target member (16) including the first target; and a second target member (18) including the second target. The first target member is connected to the object to be detected (70) in a manner that cannot be displaced relative to the moving direction without passing through the second target member, and the second target member is connected to the object to be detected in a manner that cannot be displaced relative to the moving direction without passing through the first target member.

[0274] [Fourteenth aspect]

[0275] The position detection device according to any one of the first aspect to the eighth aspect includes: a first target member (16) formed with a first insertion hole (161a) into which a detection object (70) that rotates about an axis (CL) having the normal direction as the axial direction is inserted, and first insertion grooves (161b, 161c) connected to the first insertion hole, and including the first target; and a second target member (18) formed with a second insertion hole (181a) into which the detection object is inserted, and second insertion grooves (181b, 181c) connected to the second insertion hole, and including the second target, the moving direction being the circumferential direction (Dc) of the axis, the first insertion hole and the second insertion hole being arranged to be connected to each other in the axial direction, the first insertion grooves and the second insertion grooves also being arranged to be connected to each other in the axial direction, and protruding portions (702b, 702c) are inserted into the first insertion grooves and the second insertion grooves, and the protruding portions (702b, 702c) are provided on the detection object and protrude outward in the radial direction (Dr) of the axis.

[0276] [Fifteenth Aspect]

[0277] In the position detection device according to the thirteenth aspect or the fourteenth aspect, the first target has a facing surface (22a, 23a) formed on the one side in the normal direction and facing the substrate, the second target also has a facing surface (24a, 25a) formed on the one side in the normal direction and facing the substrate, the first target member has a first connection portion (161) connected to the detection object, the second target member has a second connection portion (181) arranged on the one side in the normal direction with respect to the first connection portion and connected to the detection object, and the facing surface of the first target is arranged on the one side in the normal direction compared with the first connection portion, whereby the gap (AG) between the facing surface of the first target and the substrate in the normal direction and the gap (AG) between the facing surface of the second target and the substrate are made to coincide with each other.

Claims

1. A position detection device, comprising: A first target (22, 23) that reciprocates in a specified moving direction (Dc); A second target (24, 25) that reciprocates in the moving direction together with the first target, and A substrate (30) having a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), a first receiving coil (34, 36) and a second receiving coil (35, 37), and a third receiving coil (40, 42) and a fourth receiving coil (41, 43). Inductive currents flow through the first receiving coil and the second receiving coil due to electromagnetic induction caused by energizing the first transmitting coil, and detection signals (V1, V2) corresponding to the position of the first target are output. Inductive currents flow through the third receiving coil and the fourth receiving coil due to electromagnetic induction caused by energizing the second transmitting coil, and detection signals corresponding to the position of the second target are output. The substrate faces the first target and the second target, and when the direction crossing the moving direction is set as the normal direction (Da), the substrate is arranged on one side of the normal direction with respect to the first target and the second target. The first receiving regions (301, 302) occupied by the first receiving coil and the second receiving coil in the substrate, and the second receiving regions (303, 304) occupied by the third receiving coil and the fourth receiving coil in the substrate are arranged and configured in the moving direction. The first target reciprocates within an operating range (W1a, W1b) where the first target does not overlap with the other side of the second receiving region in the direction opposite to the one side in the normal direction.

2. The position detection device according to claim 1, The operating range of the first target is a range distributed in the moving direction centered on the central positions (301b, 302b) of the first receiving regions in the moving direction.

3. The position detection device according to claim 1, The first target reciprocates in such a manner that it does not exceed the range from the other side with respect to the end position (P1) on one side of the first receiving region and the one side with respect to the end position (P2) on the other side of the first receiving region.

4. The position detection device according to claim 1, When observing in the direction along the normal direction of the substrate, the first receiving coil, the second receiving coil, the third receiving coil and the fourth receiving coil are arranged inside the first transmitting coil and inside the second transmitting coil.

5. The position detection device according to claim 1, When observing in the direction along the normal direction of the substrate, the first receiving coil and the second receiving coil are arranged inside the first transmitting coil but outside the second transmitting coil, and the third receiving coil and the fourth receiving coil are arranged inside the second transmitting coil but outside the first transmitting coil.

6. The position detection device according to claim 1, the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of spiral portions (34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b) having a spiral pattern shape when viewed in a direction along the normal direction of the substrate.

7. The position detection device according to claim 1, the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of wavy portions (34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, 43e) having a pattern shape of a curve depicting a sine wave when viewed in a direction along the normal direction of the substrate.

8. The position detection device according to claim 1, It is provided with a failure detection unit (473, 483), and when the magnitude of the detection signal output from the first receiving coil is set to V1 and the magnitude of the detection signal output from the second receiving coil is set to V2, the failure detection unit detects a failure based on the value (Vx) obtained from V1 2 +V2 2 obtained. the detection signal of the first receiving coil changes in a sine wave shape with respect to the electrical angle (θ) corresponding to the position of the first target, the detection signal of the second receiving coil changes in a cosine wave shape with respect to the electrical angle.

9. The position detection device according to any one of claims 1 to 8, the first target and the second target respectively form a part of a rotating member (16, 18, 20) that rotates about an axis (CL) having the normal direction as an axis, the moving direction is the circumferential direction (Dc) of the axis.

10. The position detection device according to claim 9, two first targets are provided, and one of the two first targets (22) is arranged on the opposite side of the other first target (23) with the axis interposed therebetween, two receiving coil groups (301a, 302a) formed as a combination of the first receiving coil and the second receiving coil are also provided, and one of the two receiving coil groups (301a) is arranged on the opposite side of the other receiving coil group (302a) with the axis interposed therebetween.

11. The position detection device according to claim 10, the first receiving coil (34) belonging to the one receiving coil group is electrically connected to the first receiving coil (36) belonging to the other receiving coil group, the second receiving coil (35) belonging to the one receiving coil group is also electrically connected to the second receiving coil (37) belonging to the other receiving coil group.

12. The position detection device according to claim 10, the first receiving coil (34) belonging to the one receiving coil group and the first receiving coil (36) belonging to the other receiving coil group are connected in series in a direction such that the mutual induced electromotive forces generated by the electromagnetic induction of the first transmitting coil are strengthened with respect to each other, The second receiving coil (35) of the receiving coil group belonging to the one party and the second receiving coil (37) of the receiving coil group belonging to the other party are connected in series in a direction such that the induced electromotive forces generated by the electromagnetic induction of the first transmitting coil reinforce each other.

13. The position detection device according to any one of claims 1 to 8, comprising a first target member (16) including the first target and a second target member (18) including the second target, the first target member being connected to the object to be detected (70) in a manner that it cannot be displaced relative to the moving direction without passing through the second target member, the second target member being connected to the object to be detected in a manner that it cannot be displaced relative to the moving direction without passing through the first target member.

14. The position detection device according to any one of claims 1 to 8, comprising: a first target member (16) including the first target, having a first insertion hole (161a) into which the object to be detected (70) is inserted and first insertion grooves (161b, 161c) connected to the first insertion hole, the object to be detected rotating about an axis (CL) having the normal direction as the axial direction; and a second target member (18) including the second target, having a second insertion hole (181a) into which the object to be detected is inserted and second insertion grooves (181b, 181c) connected to the second insertion hole, the moving direction being the circumferential direction (Dc) of the axis, the first insertion hole and the second insertion hole being arranged to be connected to each other in the axial direction, the first insertion grooves and the second insertion grooves also being arranged to be connected to each other in the axial direction, protrusions (702b, 702c) are inserted into the first insertion grooves and the second insertion grooves, the protrusions being provided on the object to be detected and protruding outward in the radial direction (Dr) of the axis.

15. The position detection device according to claim 13, the first target having opposing surfaces (22a, 23a) formed on the one side in the normal direction and opposing the substrate, the second target also having opposing surfaces (24a, 25a) formed on the one side in the normal direction and opposing the substrate, the first target member having a first connecting portion (161) connected to the object to be detected, the second target member having a second connecting portion (181) arranged on the one side in the normal direction with respect to the first connecting portion and connected to the object to be detected, the opposing surface of the first target is arranged on the one side in the normal direction compared to the first connecting portion, whereby the gap (AG) between the opposing surface of the first target and the substrate in the normal direction and the gap (AG) between the opposing surface of the second target and the substrate are made to coincide with each other.

Images