JP2013040862A

JP2013040862A - Sensor device

Info

Publication number: JP2013040862A
Application number: JP2011178370A
Authority: JP
Inventors: Narinori Fukuda; 成紀福田; Koji Soshin; 耕児宗進; 多津彦 ▲松▼本; Tatsuhiko Matsumoto; Takashi Suma; 喬須磨
Original assignee: Panasonic Corp
Current assignee: Panasonic Corp
Priority date: 2011-08-17
Filing date: 2011-08-17
Publication date: 2013-02-28

Abstract

PROBLEM TO BE SOLVED: To expand a detectable range as compared with a conventional sensor device.SOLUTION: When a rotation angle of a detection object 50 is 0°, a right end of a detection coil 30 adjoins a left end with a maximum dimension of the detection object 50 and an opposite area between the detection coil 30 and the detection object 50 becomes zero, so that the inductance of the detection coil 30 takes a maximum value. When the detection object 50 is rotated in the counterclockwise direction from the state, the opposite area is increased in accordance with increase of the rotation angle, so that the inductance of the detection coil 30 is monotonously reduced. Since the whole detection coil 30 is covered with the detection object 50 when the rotation angle of the detection object 50 is about 340°, the opposite area becomes maximum and the inductance of the detection coil 30 takes a minimum value. Thereby, the rotation angle of an object can be continuously detected in a range of 0° to about 340° and the detectable range can be expanded as compared with a conventional sensor device.

Description

本発明は、回転する対象物の回転量や回転角度、あるいは回転位置などを検出するセンサ装置に関する。 The present invention relates to a sensor device that detects a rotation amount, a rotation angle, or a rotation position of a rotating object.

従来、回転する対象物の回転量や回転角度、あるいは回転位置などを検出するセンサ装置として種々のものが提供されている。例えば、特許文献１には、絶縁基板の表面に外形が略扇形である平面コイル(検出コイル)が形成され、検出コイルの外形に相似した略扇形の検出体が検出コイルと対向して配置されたセンサ装置が記載されている。特許文献１記載のセンサ装置では、基準周波数の発振信号を検出コイルに供給し、検出体と検出コイルとの対向面積に応じて変化する検出コイルのインダクタンスに基づいて対象物の回転角度や回転位置などを検出している。 2. Description of the Related Art Conventionally, various sensors are provided as sensor devices that detect a rotation amount, a rotation angle, or a rotation position of a rotating object. For example, in Patent Document 1, a planar coil (detection coil) whose outer shape is substantially fan-shaped is formed on the surface of an insulating substrate, and a substantially fan-shaped detection body similar to the outer shape of the detection coil is disposed to face the detection coil. A sensor device is described. In the sensor device described in Patent Document 1, an oscillation signal having a reference frequency is supplied to the detection coil, and the rotation angle or rotation position of the object is based on the inductance of the detection coil that changes according to the facing area between the detection body and the detection coil. Etc. are detected.

特開２０１１−１３１０３２号公報JP 2011-131032 A

しかしながら、特許文献１記載の従来例では、検出コイルの外形と検出体の形状とが相似しており、しかも、検出感度を確保するために検出コイルの寸法をある程度大きくしなければならないので、検出可能な角度が180°程度に制限されてしまっていた。 However, in the conventional example described in Patent Document 1, the outer shape of the detection coil and the shape of the detection body are similar, and the size of the detection coil must be increased to some extent in order to ensure detection sensitivity. The possible angle was limited to about 180 °.

本発明は、上記課題に鑑みて為されたものであり、従来よりも検出可能な範囲を拡大することを目的とする。 The present invention has been made in view of the above-described problems, and an object of the present invention is to expand the range that can be detected than before.

本発明のセンサ装置は、回転する対象物の回転量や回転角度、あるいは回転位置などを検出するセンサ装置であって、検出コイルと、非磁性体材料からなり、前記対象物と連動して円周軌道上を変位する検出体と、前記検出コイル並びに前記検出体を内部に収納し且つ前記検出体の円周軌道と前記検出コイルが前記検出コイルの軸方向に沿って対向するように前記検出コイルを支持するケースとを備え、前記検出体は、前記円周軌道の径方向に沿った幅寸法が前記円周軌道の周方向に沿って単調に増加又は減少する螺旋形に形成されることを特徴とする。 The sensor device of the present invention is a sensor device that detects a rotation amount, a rotation angle, a rotation position, or the like of a rotating object, and includes a detection coil and a non-magnetic material, and is connected to the object in a circle. The detection body that displaces on a circumferential track, the detection coil, and the detection body are housed therein, and the circumferential track of the detection body and the detection coil are opposed to each other along the axial direction of the detection coil. A coil supporting case, and the detector is formed in a spiral shape in which the width dimension along the radial direction of the circumferential track monotonously increases or decreases along the circumferential direction of the circumferential track. It is characterized by.

このセンサ装置において、複数の前記検出コイルが、前記検出体の円周軌道を挟んで互いに対向するように前記ケースに支持されることが好ましい。 In this sensor device, it is preferable that the plurality of detection coils are supported by the case so as to face each other across a circumferential track of the detection body.

本発明のセンサ装置は、従来よりも検出可能な範囲を拡大することができるという効果がある。 The sensor device of the present invention has an effect that the detectable range can be expanded as compared with the conventional case.

(ａ)，(ｂ)は本発明に係るセンサ装置の実施形態１の動作を説明するための説明図である。(a), (b) is explanatory drawing for demonstrating operation | movement of Embodiment 1 of the sensor apparatus based on this invention. 同上の分解斜視図である。It is an exploded perspective view same as the above. 本発明に係るセンサ装置の実施形態２を示す分解斜視図である。It is a disassembled perspective view which shows Embodiment 2 of the sensor apparatus which concerns on this invention.

(実施形態１)
以下、図面を参照して、本発明に係るセンサ装置の実施形態１について詳細に説明する。ただし、以下の説明では図２において上下左右及び前後の向きを定義する。 (Embodiment 1)
Hereinafter, a sensor device according to a first embodiment of the present invention will be described in detail with reference to the drawings. However, in the following description, the vertical and horizontal directions and the front and rear directions are defined in FIG.

本実施形態のセンサ装置は、図２に示すように絶縁基板３やロータブロック５などがケースボディ１とケースカバー２からなるケース内に収納されて構成されている。絶縁基板３は円盤状に形成されるとともに中央部に円形の貫通孔31が貫設されている。そして、絶縁基板３の表面(上面)に、その外形が略扇形となり且つその軸方向が絶縁基板３の厚み方向(上下方向)に一致するようにパターニングされた検出コイル30が印刷形成されている。ただし、検出コイル30の形状は厳密に言うと扇形ではなく、扇形から一回り小さい相似形の扇形を切り取った残りの図形に等しい形状であり、本実施形態における「略扇形」は全て「扇形から一回り小さい相似形の扇形を切り取った残りの図形」を指すものとする。 As shown in FIG. 2, the sensor device of the present embodiment is configured such that an insulating substrate 3, a rotor block 5, and the like are housed in a case including a case body 1 and a case cover 2. The insulating substrate 3 is formed in a disk shape, and a circular through hole 31 is provided in the center. A detection coil 30 is printed on the surface (upper surface) of the insulating substrate 3 and patterned so that its outer shape is substantially fan-shaped and its axial direction coincides with the thickness direction (vertical direction) of the insulating substrate 3. . However, strictly speaking, the shape of the detection coil 30 is not a fan shape, but is a shape equal to the remaining figure obtained by cutting out a fan shape that is slightly smaller than the fan shape. It refers to the “remaining figure obtained by cutting out a slightly similar fan shape”.

また、絶縁基板３の外周縁には、相対的に幅が細い複数(図示例では４つ)の切欠32と、相対的に幅が太い複数(図示例では３つ)の切欠33とがそれぞれ等間隔且つ互い違いに設けられている。さらに、絶縁基板３の後端部には４つのスルーホール34が周方向に沿って並設されており、絶縁基板３の裏面(下面)において、検出コイル30のコイル端末と電気的に接続されたランド(図示せず)が各スルーホール34の開口端に印刷形成されている。 Further, on the outer peripheral edge of the insulating substrate 3, a plurality of (not shown in the figure) notches 32 having a relatively narrow width and a plurality of notches 33 (three in the example shown in the figure) having relatively large widths are respectively provided. It is provided at equal intervals and alternately. Further, four through holes 34 are arranged in the circumferential direction at the rear end of the insulating substrate 3, and are electrically connected to the coil terminal of the detection coil 30 on the back surface (lower surface) of the insulating substrate 3. A land (not shown) is printed at the open end of each through hole 34.

ロータブロック５は、検出体50、保持体51、軸部52などを有している。保持体51は、合成樹脂材料によって円盤状に形成され、その中心部分より上下両側に軸部52が突設されている。検出体50は、非磁性材料(例えば、アルミ板)で螺旋形に形成されて保持体51に同時成形されている。この検出体50は、円周軌道の径方向(保持体51の径方向)に沿った幅寸法が保持体51の周方向に沿って単調に増加又は減少する螺旋形に形成されている。つまり、検出体50の前記幅寸法は、一端側でゼロ(以下、最小寸法と呼ぶ。)となり、他端側で軸部52から保持体51の周縁までの径寸法よりも僅かに小さい寸法(以下、最大寸法と呼ぶ。)となる。 The rotor block 5 includes a detection body 50, a holding body 51, a shaft portion 52, and the like. The holding body 51 is formed in a disc shape from a synthetic resin material, and shaft portions 52 are projected on both upper and lower sides from the center portion. The detection body 50 is formed in a spiral shape with a nonmagnetic material (for example, an aluminum plate) and is simultaneously formed on the holding body 51. The detection body 50 is formed in a spiral shape in which the width dimension along the radial direction of the circumferential track (the radial direction of the holding body 51) monotonously increases or decreases along the circumferential direction of the holding body 51. That is, the width dimension of the detection body 50 is zero (hereinafter referred to as the minimum dimension) on one end side, and is slightly smaller than the diameter dimension from the shaft portion 52 to the periphery of the holding body 51 on the other end side ( Hereinafter referred to as the maximum dimension).

軸部52は全体が円柱形状であって、相対的に径の大きい大径部52Aと、相対的に径が小さく且つ大径部52Aの両端から突出する一対の小径部52Bとが金属材料によって一体に形成されている。そして、軸部52が保持体51に同時成形されてロータブロック５が構成されている。 The shaft portion 52 is entirely cylindrical, and a large diameter portion 52A having a relatively large diameter and a pair of small diameter portions 52B having a relatively small diameter and projecting from both ends of the large diameter portion 52A are made of a metal material. It is integrally formed. The shaft portion 52 is simultaneously formed on the holding body 51 to constitute the rotor block 5.

ケースボディ１は、上面が開口する扁平な有底円筒形状に形成された収納部10と、収納部10周面の後端側より後方に突設された矩形筒状の突出部11と、収納部10周面の前端側より前方に突設された略台形状のフランジ部12とを有している。なお、ケースボディ１は合成樹脂成形体で構成されている。 The case body 1 includes a storage portion 10 formed in a flat bottomed cylindrical shape with an open top surface, a rectangular cylindrical protrusion 11 protruding rearward from the rear end side of the peripheral surface of the storage portion 10, and a storage And a substantially trapezoidal flange portion 12 projecting forward from the front end side of the peripheral surface of the portion 10. The case body 1 is made of a synthetic resin molded body.

収納部10の内底面中央には円筒形のボス13が突設され、このボス13の内部には金属材料によって円筒形に形成された軸受部14が同時成形によって埋設されている。そして、ボス13に埋設されている軸受部14によってロータブロック５の軸部52(大径部52A)が回動自在に軸支される。 A cylindrical boss 13 protrudes from the center of the inner bottom surface of the storage portion 10, and a bearing portion 14 formed in a cylindrical shape by a metal material is embedded in the boss 13 by simultaneous molding. The shaft portion 52 (large diameter portion 52A) of the rotor block 5 is rotatably supported by the bearing portion 14 embedded in the boss 13.

また収納部10の内周面には、内底面からの高さ寸法が異なる２種類のリブ10A，10Bが突設されるとともに、これら２種類のリブ10A，10Bの上面にはそれぞれリブ10A，10Bよりも小型のリブ10C，10Dが上向きに突設されている。高さ寸法の低い(背の低い)リブ10A上面に突設されているリブ10Cは、絶縁基板３の外周縁に設けられている幅細の切欠32とそれぞれ嵌合する。一方、高さ寸法の高い(背の高い)リブ10Bは、同じく絶縁基板３の外周縁に設けられている幅広の切欠33とそれぞれ嵌合する。 In addition, two types of ribs 10A and 10B with different heights from the inner bottom surface are projected on the inner peripheral surface of the storage portion 10, and the ribs 10A and 10B are respectively provided on the upper surfaces of the two types of ribs 10A and 10B. Ribs 10C and 10D that are smaller than 10B project upward. The ribs 10C protruding from the upper surface of the ribs 10A having a low height (the short height) are respectively fitted with narrow notches 32 provided on the outer peripheral edge of the insulating substrate 3. On the other hand, the ribs 10B having a high height (tall) are respectively fitted into wide notches 33 provided on the outer peripheral edge of the insulating substrate 3.

フランジ部12には上下方向に貫通する半円筒形のねじ挿通孔12Aが設けられており、このねじ挿通孔12Aに挿通された取付ねじを用いてケースボディ１が被取付面に取付られる。 The flange portion 12 is provided with a semi-cylindrical screw insertion hole 12A penetrating in the vertical direction, and the case body 1 is attached to the surface to be attached using an attachment screw inserted into the screw insertion hole 12A.

ケースカバー２は円盤状の主部20と、主部20の後端縁より後方に突出する矩形板状の端子カバー部21とが合成樹脂成形体として一体に形成されている。そして、ケースボディ１の収納部１０上面が主部20で閉塞され、突出部11の上面が端子カバー部21で閉塞されるようにケースボディ１上面にケースカバー２が取り付けられる。また、主部20の中央部には上向きに突出する円錐台形状の突部22が突設され、突部22の内部には下面が開口する有底円筒形状の軸受部(図示せず)が凹設されている。さらに、主部20の下面における軸受部の周縁には、後述するように軸部52の上側小径部52Bに外挿されたコイルばね７の上端が嵌るばね座部(図示せず)が凹設されている。 In the case cover 2, a disk-shaped main portion 20 and a rectangular plate-shaped terminal cover portion 21 protruding rearward from the rear end edge of the main portion 20 are integrally formed as a synthetic resin molded body. Then, the case cover 2 is attached to the upper surface of the case body 1 so that the upper surface of the housing portion 10 of the case body 1 is closed by the main portion 20 and the upper surface of the protruding portion 11 is closed by the terminal cover portion 21. In addition, a frustoconical protrusion 22 that protrudes upward protrudes from the center of the main part 20, and a bottomed cylindrical bearing part (not shown) having an open bottom surface is provided inside the protrusion 22. It is recessed. Further, a spring seat portion (not shown) into which the upper end of the coil spring 7 fitted on the upper small diameter portion 52B of the shaft portion 52 is fitted is recessed in the periphery of the bearing portion on the lower surface of the main portion 20 as will be described later. Has been.

次に、本実施形態のセンサ装置の組立手順を説明する。まず、ケースボディ１の収納部10内に絶縁基板３を収納する。続いて、軸受部14にワッシャ8Bを介して軸部52を内挿し、ロータブロック５をボス13の上に載置する。そして、軸部52の上側の小径部52Bにワッシャ8Aを介してコイルばね７を外挿した後、ケースボディ１の上面にケースカバー２を被せる。最後に、ケースボディ１の収納部10上端面とケースカバー２の周縁部とを接着や溶着などの適宜の方法で固定すれば、本実施形態のセンサ装置の組立が完了する。 Next, the assembly procedure of the sensor device of this embodiment will be described. First, the insulating substrate 3 is stored in the storage portion 10 of the case body 1. Subsequently, the shaft portion 52 is inserted into the bearing portion 14 via the washer 8B, and the rotor block 5 is placed on the boss 13. Then, after the coil spring 7 is extrapolated to the small diameter portion 52B on the upper side of the shaft portion 52 via the washer 8A, the case cover 2 is put on the upper surface of the case body 1. Finally, if the upper end surface of the storage portion 10 of the case body 1 and the peripheral edge portion of the case cover 2 are fixed by an appropriate method such as adhesion or welding, the assembly of the sensor device of this embodiment is completed.

而して、ロータブロック５の軸部52が対象物に固定され、対象物の回転に連動してロータブロック５が対象物と同じ向きに回転し、その結果、保持体51に保持されている検出体50も対象物と同じ向きに円周軌道上を変位することになる。そして、特許文献１記載の従来例と同様に、基準周波数の発振信号が検出コイル30に供給され、検出体50と検出コイル30との対向面積に応じて変化する検出コイル30のインダクタンスに基づいて対象物の回転角度や回転位置などを検出することができる。但し、具体的な検出方法については特許文献１にも開示されているように従来周知であるから詳細な説明を省略する。 Thus, the shaft portion 52 of the rotor block 5 is fixed to the object, and the rotor block 5 rotates in the same direction as the object in conjunction with the rotation of the object. As a result, the rotor block 5 is held by the holding body 51. The detection body 50 is also displaced on the circumferential orbit in the same direction as the object. Then, similarly to the conventional example described in Patent Document 1, an oscillation signal having a reference frequency is supplied to the detection coil 30, and based on the inductance of the detection coil 30 that changes according to the facing area between the detection body 50 and the detection coil 30. The rotation angle, rotation position, etc. of the object can be detected. However, since a specific detection method is conventionally known as disclosed in Patent Document 1, detailed description thereof is omitted.

ここで、検出体50の回転角度と検出コイル30のインダクタンスとの関係を図１に示す。図１(ａ)は、検出体50が反時計回りに回転する場合、検出体50と検出コイル30との対向面積の変化の様子を左から右に向けて並べて表している。また、図１(ｂ)は、検出体50の回転角度に対する検出コイル30のインダクタンスの変化の様子を表している。 Here, the relationship between the rotation angle of the detection body 50 and the inductance of the detection coil 30 is shown in FIG. FIG. 1A shows changes in the facing area of the detection body 50 and the detection coil 30 side by side from left to right when the detection body 50 rotates counterclockwise. FIG. 1B shows how the inductance of the detection coil 30 changes with respect to the rotation angle of the detection body 50.

而して、検出体50の回転角度が０°のときは検出コイル30の右端と検出体50の最大寸法の端部の左端とが隣接し、検出コイル30と検出体50の対向面積(以下、対向面積と略す。)がゼロとなるので、検出コイル30のインダクタンスが最大値をとる。ここから検出体50が反時計回りに回転すると、回転角度が大きくなるに従って対向面積が増加するので、検出コイル30のインダクタンスが単調減少する。そして、検出体50の回転角度が約340°のときに検出コイル30全体が検出体50に被われることで対向面積が最大となり、検出コイル30のインダクタンスが最小値をとる。 Thus, when the rotation angle of the detection body 50 is 0 °, the right end of the detection coil 30 and the left end of the end of the maximum dimension of the detection body 50 are adjacent to each other. , Abbreviated as “opposite area”) becomes zero, and the inductance of the detection coil 30 takes the maximum value. If the detection body 50 rotates counterclockwise from here, the opposing area increases as the rotation angle increases, so the inductance of the detection coil 30 monotonously decreases. When the rotation angle of the detection body 50 is about 340 °, the entire detection coil 30 is covered with the detection body 50, so that the opposing area is maximized, and the inductance of the detection coil 30 is minimum.

上述のように本実施形態のセンサ装置によれば、対象物の回転角度を０°から約340°の範囲まで連続して検出することが可能であり、従来よりも検出可能な範囲を拡大することができる。 As described above, according to the sensor device of the present embodiment, the rotation angle of the object can be continuously detected from 0 ° to about 340 °, and the detectable range is expanded compared to the conventional case. be able to.

(実施形態２)
本発明に係るセンサ装置の実施形態２について、図３を参照して説明する。ただし、以下の説明では図３において上下左右及び前後の向きを定義する。また、本実施形態のセンサ装置の基本構成は実施形態１とほぼ共通であるから、実施形態１と共通の構成要素には同一の符号を付して説明を省略する。 (Embodiment 2)
Embodiment 2 of the sensor device according to the present invention will be described with reference to FIG. However, in the following description, the vertical and horizontal directions and the front and rear directions are defined in FIG. In addition, since the basic configuration of the sensor device of the present embodiment is substantially the same as that of the first embodiment, the same reference numerals are given to the same components as those of the first embodiment, and the description thereof is omitted.

本実施形態のセンサ装置は、表面に検出コイル30，40が印刷形成された２枚の絶縁基板３，４が、検出体50の円周軌道を挟んでそれぞれの表面に形成されている検出コイル30，40が互いに対向するようにケースに支持される点に特徴がある。なお、以下の説明では、ロータブロック５の下側に配置される絶縁基板３を第１絶縁基板、ロータブロック５の上側に配置される絶縁基板４を第２絶縁基板と呼ぶ。 In the sensor device of this embodiment, two insulating substrates 3 and 4 having detection coils 30 and 40 printed on the surface are formed on the respective surfaces with the circumferential orbit of the detection body 50 interposed therebetween. It is characterized in that 30 and 40 are supported by the case so as to face each other. In the following description, the insulating substrate 3 disposed below the rotor block 5 is referred to as a first insulating substrate, and the insulating substrate 4 disposed above the rotor block 5 is referred to as a second insulating substrate.

第２絶縁基板４は円盤状に形成されるとともに中央部に円形の貫通孔41が貫設された主片40と、主片40後側の外周縁から突出する矩形の端子片42とが一体に形成されてなる。そして、第２絶縁基板４の表面(下面)には貫通孔41を挟んで対向する位置に検出コイル40が印刷形成されている。なお、この検出コイル40は第１絶縁基板３の検出コイル30と同形状及び同寸法に形成されている。また、第２絶縁基板４の外周縁には、幅細の複数(図示例では３つ)の切欠43が等間隔に設けられている。さらに、主片40の後端部(端子片42との連結部分)に４つのスルーホール44が周方向に沿って並設されるとともに、端子片42にも４つのスルーホール45が左右方向に沿って並設されている。第２絶縁基板４の裏面(上面)において、表面側の検出コイル40のコイル端末と電気的に接続されたランド(図示せず)が各スルーホール44の開口端に印刷形成される。さらに、図示しない導電パターンによって当該４つのランドとそれぞれ電気的に接続された４つのランド(図示せず)が端子片42の各スルーホール45の開口端に印刷形成されている。 The second insulating substrate 4 is formed in a disc shape, and a main piece 40 having a circular through hole 41 formed in the center thereof and a rectangular terminal piece 42 protruding from the outer peripheral edge on the rear side of the main piece 40 are integrated. Formed. A detection coil 40 is printed on the surface (lower surface) of the second insulating substrate 4 at a position facing the through hole 41. The detection coil 40 has the same shape and the same size as the detection coil 30 of the first insulating substrate 3. In addition, a plurality of narrow (three in the illustrated example) cutouts 43 are provided at equal intervals on the outer peripheral edge of the second insulating substrate 4. Further, four through-holes 44 are arranged along the circumferential direction at the rear end of the main piece 40 (connection portion with the terminal piece 42), and four through-holes 45 are also formed in the terminal piece 42 in the horizontal direction. Along the line. On the back surface (upper surface) of the second insulating substrate 4, lands (not shown) electrically connected to the coil terminals of the detection coil 40 on the front surface side are printed and formed at the open ends of the through holes 44. Further, four lands (not shown) electrically connected to the four lands by conductive patterns (not shown) are printed at the open ends of the through holes 45 of the terminal pieces 42.

ここで、第１絶縁基板３に形成されている検出コイル30と第２絶縁基板４に形成されている検出コイル40は、端子ブロック６を介して電気的に直列接続されている。端子ブロック６は、４本の端子ピン60と、これら４本の端子ピン60をそれぞれの中央部分で保持する絶縁体61とを有する。そして、第１絶縁基板３の４つのスルーホール34にそれぞれ端子ピン60の下端部分が挿通されて絶縁基板３下面のランドにはんだ付けされる。さらに、端子ブロック６の端子ピン60の上端部分が第２絶縁基板４の４つのスルーホール44にそれぞれ挿通されて第２絶縁基板４上面のランドにはんだ付けされる。つまり、４本の端子ピン60を介して第１絶縁基板３側の検出コイル30の端末と、第２絶縁基板４側の検出コイル40の端末とが電気的に接続されている。 Here, the detection coil 30 formed on the first insulating substrate 3 and the detection coil 40 formed on the second insulating substrate 4 are electrically connected in series via the terminal block 6. The terminal block 6 includes four terminal pins 60 and an insulator 61 that holds the four terminal pins 60 at their central portions. Then, the lower end portions of the terminal pins 60 are respectively inserted into the four through holes 34 of the first insulating substrate 3 and soldered to lands on the lower surface of the insulating substrate 3. Further, the upper end portions of the terminal pins 60 of the terminal block 6 are respectively inserted into the four through holes 44 of the second insulating substrate 4 and soldered to lands on the upper surface of the second insulating substrate 4. That is, the terminal of the detection coil 30 on the first insulating substrate 3 side and the terminal of the detection coil 40 on the second insulating substrate 4 side are electrically connected via the four terminal pins 60.

次に、本実施形態のセンサ装置の組立手順を説明する。まず、ケースボディ１の収納部10内に、端子ブロック６が実装された第１絶縁基板３を収納する。続いて、軸受部14にワッシャ8Bを介して軸部52を内挿してロータブロック５をボス１３の上に載置した後、第２絶縁基板４を収納部10内に収納する。そして、軸部52の上側の小径部52Bにワッシャ8Aを介してコイルばね７を外挿した後、ケースボディ１の上面にケースカバー２を被せる。最後に、ケースボディ１の収納部10上端面とケースカバー２の周縁部とを接着や溶着などの適宜の方法で固定すれば、本実施形態のセンサ装置の組立が完了する。 Next, the assembly procedure of the sensor device of this embodiment will be described. First, the first insulating substrate 3 on which the terminal block 6 is mounted is housed in the housing portion 10 of the case body 1. Subsequently, after inserting the shaft portion 52 into the bearing portion 14 via the washer 8B and placing the rotor block 5 on the boss 13, the second insulating substrate 4 is accommodated in the accommodating portion 10. Then, after the coil spring 7 is extrapolated to the small diameter portion 52B on the upper side of the shaft portion 52 via the washer 8A, the case cover 2 is put on the upper surface of the case body 1. Finally, if the upper end surface of the storage portion 10 of the case body 1 and the peripheral edge portion of the case cover 2 are fixed by an appropriate method such as adhesion or welding, the assembly of the sensor device of this embodiment is completed.

上述のように本実施形態のセンサ装置では、電気的に直列接続されている一対の検出コイル30、40が円周軌道を挟んで対向配置されている。このため、振動やがたつき等が原因で検出体50が上下方向に沿って変位したとしても、直列接続されている一対の検出コイル30，40のインダクタンスには影響せず、常に安定した検出結果を得ることができる。 As described above, in the sensor device of the present embodiment, the pair of detection coils 30 and 40 that are electrically connected in series are arranged to face each other with the circumferential track therebetween. For this reason, even if the detection body 50 is displaced along the vertical direction due to vibration, rattling, etc., the inductance of the pair of detection coils 30 and 40 connected in series is not affected, and the detection is always stable. The result can be obtained.

１ケースボディ(ケース)
２ケースカバー(ケース)
３絶縁基板
５ロータブロック
30 検出コイル
50 検出体 1 Case body (case)
2 Case cover (case)
3 Insulating substrate 5 Rotor block
30 detection coil
50 detection object

Claims

A sensor device for detecting a rotation amount, a rotation angle, or a rotation position of a rotating object, comprising a detection coil and a non-magnetic material, and detecting displacement on a circumferential track in conjunction with the object. A body, a case that houses the detection coil and the detection body, and supports the detection coil such that a circumferential track of the detection body and the detection coil face each other along an axial direction of the detection coil. The sensor body is provided with a spiral shape in which a width dimension along a radial direction of the circumferential track is monotonously increased or decreased along a circumferential direction of the circumferential track.

The sensor device according to claim 1, wherein the plurality of detection coils are supported by the case so as to face each other across a circumferential track of the detection body.