JPS63302305A - Rotation angle detector - Google Patents

Rotation angle detector

Info

Publication number
JPS63302305A
JPS63302305A JP13809887A JP13809887A JPS63302305A JP S63302305 A JPS63302305 A JP S63302305A JP 13809887 A JP13809887 A JP 13809887A JP 13809887 A JP13809887 A JP 13809887A JP S63302305 A JPS63302305 A JP S63302305A
Authority
JP
Japan
Prior art keywords
light
optical fiber
disc
numerical aperture
emitting element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13809887A
Other languages
Japanese (ja)
Inventor
Akira Hasegawa
明 長谷川
Yuji Maeda
裕司 前田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Hitachi Automotive Systems Engineering Co Ltd
Original Assignee
Hitachi Automotive Engineering Co Ltd
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Automotive Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Automotive Engineering Co Ltd
Priority to JP13809887A priority Critical patent/JPS63302305A/en
Publication of JPS63302305A publication Critical patent/JPS63302305A/en
Pending legal-status Critical Current

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  • Length Measuring Devices By Optical Means (AREA)
  • Optical Transform (AREA)

Abstract

PURPOSE:To obtain a detector small with high resolutions free from effect of a high temperature and electromagnetic noise, by inserting an optical fiber between a light emitting element and a photodetector and a rotary disc as separated therefrom. CONSTITUTION:An optical fiber is inserted between light emitting element and photodetector 76 and 78 and a disc 32 as separated therefrom 76 and 78. In other words, light radiated from the light emitting element 76 is introduced near the disc 32 with a first optical fiber 54 to irradiate the disc 32 with light emitted at an end face of the fiber 54. The reflected light from the disc 32 is introduced with second optical fibers 56a-56f to the photodetector 78. On the other hand, light emitted from the optical fiber 54 expands and hits the disc 32 based on numerical aperture determined by refractive indexes of a core and a clad composing the optical fiber. The reflected light expands more than doubling the angle of expansion of the emitted light toward the optical fibers 56a-56f. To receive the reflected light efficiently, the fiber 54 is selected in a smaller numerical aperture while the optical fibers 56a-56f in a larger numerical aperture.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は回転角検出器に係り、特に、自動車エンジンの
クランク角を検出するに好適な回転角検出器に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotation angle detector, and particularly to a rotation angle detector suitable for detecting the crank angle of an automobile engine.

〔従来の技術〕[Conventional technology]

従来の検出器は、USP −3811056に記載のよ
うに、複数の切り込みを有する回転円盤を挟んで発光素
子と受光素子を配置した構造であった。しかし。
A conventional detector has a structure in which a light-emitting element and a light-receiving element are arranged with a rotating disk having a plurality of notches in between, as described in USP-3811056. but.

この検出器をエンジンに用いた場合には、高湿と電磁ノ
イズの影響を受けるが、この点について配慮されていな
かった。
When this detector is used in an engine, it is affected by high humidity and electromagnetic noise, but no consideration was given to this point.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

前記発光素子は周囲温度の上昇により光出力が低下して
誤検出を起こす問題がある。また、検出角度の分解能を
上げるには、前記回転円盤の切込みよりも、光ビームの
径を細くする必要がある。
The light emitting device has a problem in that the light output decreases due to an increase in ambient temperature, resulting in false detection. Furthermore, in order to increase the resolution of the detection angle, it is necessary to make the diameter of the light beam smaller than the notch of the rotating disk.

光ビーム径を細くする方法として、レンズや空間フィル
タを用いる方法がある。しかし、これらの方法は光軸調
整を必要とし、部品点数も増加するので高コストになっ
てしまう。
As a method of reducing the diameter of the light beam, there is a method of using a lens or a spatial filter. However, these methods require optical axis adjustment and increase the number of parts, resulting in high costs.

本発明の目的は上記した従来技術の欠点を除き、小型、
高分解能で、高温度や電磁ノイズの影響を受けない回転
角検出器を提供するにある。
The object of the present invention is to eliminate the drawbacks of the prior art described above, and to
The object of the present invention is to provide a rotation angle detector that has high resolution and is not affected by high temperatures or electromagnetic noise.

〔問題点を解決するための手段〕[Means for solving problems]

上記目的は前記した発光素子と受光素子を回転円盤から
引離して、前記各素子と円盤との間に光ファイバを挿入
することにより達成される。即ち。
The above object is achieved by separating the light emitting element and light receiving element described above from the rotating disk and inserting an optical fiber between each of the elements and the disk. That is.

発光素子から放射した光を第一の光ファイバによリ円盤
の側近まで導き、該ファイバの端面から出射した光を円
盤に当射する。円盤における反射光は第二の光ファイバ
により受光素子まで導く。前記第一の光ファイバからの
出射光は、光ファイバを構成するコアとのクラッドの屈
折率で定る開口数に基づいて、広がって円盤に当る。反
射光は出射光の広がり角の2倍以上の広がりで第二の光
フアイバ端面へ向う。そこで、反射光を効率よく受光す
るために、本発明は前記第一の光ファイバの開口数を小
さいものに選定し、第二の光ファイバの開口数を大きい
ものに選定するものとしている。
The light emitted from the light emitting element is guided to the vicinity of the disc through a first optical fiber, and the light emitted from the end face of the fiber is applied to the disc. The reflected light from the disk is guided to the light receiving element by a second optical fiber. The light emitted from the first optical fiber spreads and hits the disk based on the numerical aperture determined by the refractive index of the core and cladding that constitute the optical fiber. The reflected light travels toward the end face of the second optical fiber with a spread angle that is more than twice the spread angle of the emitted light. Therefore, in order to efficiently receive the reflected light, in the present invention, the numerical aperture of the first optical fiber is selected to be small, and the numerical aperture of the second optical fiber is selected to be large.

〔実施例〕〔Example〕

以下、本発明の実施例を図面により説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第1図において、1は火花点火エンジンに用いられる点
火用の高圧配電器である。2はエンジンのクランク軸の
回転力によって駆動される回転軸であり、4はハウジン
グ、6はベアリングである。
In FIG. 1, reference numeral 1 denotes a high-voltage power distributor for ignition used in a spark ignition engine. 2 is a rotating shaft driven by the rotational force of the crankshaft of the engine, 4 is a housing, and 6 is a bearing.

8はこの配電器1をエンジンに取付固定するためにフラ
ンジに設けた取付穴である。10はカバーであり、ねじ
12によりハウジング4に固定されている。カバー10
は、高圧入力部14.高圧接点16.高圧端子18及び
高圧出力部20と一体になっている。22は軸2にねじ
24によって固定され、軸2の回転とともに回転して高
圧分配をするロータヘッドである。該ロータヘッド22
は導電部26を含んでいる。また、軸2には円盤32が
スペーサ28により固定されている。34は回転角を検
出するためのヘッドであり、光ケーブル36の一端を固
定し端面研磨したものである。
Reference numeral 8 denotes a mounting hole provided in the flange for mounting and fixing the power distributor 1 to the engine. 10 is a cover, which is fixed to the housing 4 with screws 12. cover 10
is the high voltage input section 14. High voltage contact 16. It is integrated with the high voltage terminal 18 and the high voltage output section 20. A rotor head 22 is fixed to the shaft 2 with a screw 24 and rotates with the rotation of the shaft 2 to distribute high pressure. The rotor head 22
includes a conductive portion 26. Further, a disk 32 is fixed to the shaft 2 by a spacer 28. 34 is a head for detecting the rotation angle, and one end of the optical cable 36 is fixed and the end face is polished.

光ケーブル36の他端は、車両のエンジン室と車室との
間の仕切壁42を通して車室内にて、コネクタ38によ
り制御装置40に接続されている。
The other end of the optical cable 36 is connected to a control device 40 by a connector 38 inside the vehicle through a partition wall 42 between the engine compartment and the vehicle compartment.

円盤32は第2図に示すように、取付穴44とスリット
46が施しである。ヘッド34は第3図に示すように、
フランジ48に穴50.52を設けてあり、第1図に示
す如くねじによって取付は固定される。光ケーブル36
は第4図にその端面を示すように、中央に光出射用光フ
ァイバ54と、その周りに6個の受光用光ファイバ56
a、56b。
As shown in FIG. 2, the disk 32 is provided with mounting holes 44 and slits 46. The head 34, as shown in FIG.
Holes 50,52 are provided in the flange 48 and the mounting is secured by screws as shown in FIG. Optical cable 36
As shown in the end face in FIG. 4, there is a light emitting optical fiber 54 in the center and six light receiving optical fibers 56 around it.
a, 56b.

56c、56d、56e、56fを配した構成としてい
る。ヘッド34の端面35は鏡面状に研磨している。
56c, 56d, 56e, and 56f are arranged. The end surface 35 of the head 34 is mirror polished.

光ケーブル36の他端には、第5図に示すように、コネ
クタ38を取付けている。該コネクタ38は、第6図に
示す光電変換部62に結合させるため、挿入部60と位
置合せ溝58を有するとともに、光ファイバ54と、光
ファイバ56a〜56fとを分難して処理し、端面57
及び59を鏡面状に研磨し仕上げている。
A connector 38 is attached to the other end of the optical cable 36, as shown in FIG. The connector 38 has an insertion section 60 and an alignment groove 58 in order to be coupled to the photoelectric conversion section 62 shown in FIG. 57
and 59 are polished to a mirror finish.

第6図に示した光電変換部62は、取付穴72a。The photoelectric conversion section 62 shown in FIG. 6 has a mounting hole 72a.

72bが設けられたフランジ70a、70bを有するケ
ース64に基板74が取付けられた構造である。コネク
タ挿入部66の中に仕切壁から突出した位置決め部68
が設けられ、第5図の位置合せ溝58とはめ合うように
している。基板74には発光素子76、受光素子7B、
@動回路8o及び受光回路82を搭載している。光電変
換器62は第1図に示した制御装置40内に組込まれる
It has a structure in which a substrate 74 is attached to a case 64 having flanges 70a and 70b provided with flanges 72b. A positioning portion 68 protruding from the partition wall into the connector insertion portion 66
is provided so as to fit into the alignment groove 58 shown in FIG. The substrate 74 includes a light emitting element 76, a light receiving element 7B,
It is equipped with a moving circuit 8o and a light receiving circuit 82. The photoelectric converter 62 is incorporated into the control device 40 shown in FIG.

次に動作について説明する。制御装置40は、本発明の
回転角検出器による検出信号を入力して何らかの仕事を
行なうもので、たとえば、エンジンの点火時期の制御装
置がある。これはエンジンのピストンの上死点に対する
クランク角度を検出して最適な点火位置を演算し、その
位置にて点火の制御を行なうものである。この制御に必
要な回転角の分解能は1度にもなり、第2図の円盤の大
きさの経済的制約から、スリット46の幅は0.2ミリ
メートル程度、スリットとスリットの間隔。
Next, the operation will be explained. The control device 40 performs some work by inputting a detection signal from the rotation angle detector of the present invention, and is, for example, a control device for controlling the ignition timing of an engine. This detects the crank angle of the engine piston relative to the top dead center, calculates the optimal ignition position, and controls ignition at that position. The resolution of the rotational angle required for this control is as much as 1 degree, and due to the economical constraints of the size of the disk shown in FIG. 2, the width of the slit 46 is approximately 0.2 mm, and the spacing between the slits.

即ち反射部分の幅は0.2 ミリメートル程度となる。That is, the width of the reflective portion is approximately 0.2 mm.

第7図はヘッド34の先端部における人出射光の径路を
示すものであり、光ファイバ54はコア542とクラッ
ド544とから成り、コア部の直径は50マイクロメ一
タ程度である。この光ファイバ54の開口数は0.15
以下が好ましい。開口数の逆正弦は、はぼ、入出射光の
広がり角であるから、上記の例では、光ファイバ54か
らの出射光の広がり角は8.5度位となる。円盤32上
での当射光のビームの直径を0.2  ミリメートル以
下にするには円盤32とヘッド34の端部との間隔を0
.5  ミリメートル以下とすればよい。反射光は広が
り角が出射光の2倍以上となるが、反射面の状態により
、さらに広がる。したがって余裕をとって、光ファイバ
56a〜56fの開口数は0.5 程度が好適となる。
FIG. 7 shows the path of the light emitted from the head at the tip of the head 34. The optical fiber 54 consists of a core 542 and a cladding 544, and the diameter of the core is about 50 micrometers. The numerical aperture of this optical fiber 54 is 0.15
The following are preferred. Since the inverse sine of the numerical aperture is the spread angle of the input and output light, in the above example, the spread angle of the output light from the optical fiber 54 is about 8.5 degrees. In order to make the diameter of the beam of light incident on the disk 32 less than 0.2 mm, the distance between the disk 32 and the end of the head 34 is set to 0.
.. It should be 5 mm or less. The spread angle of the reflected light is more than twice that of the emitted light, but it spreads further depending on the state of the reflecting surface. Therefore, to ensure a margin, the numerical aperture of the optical fibers 56a to 56f is preferably about 0.5.

第6図において、駆動回路80は発光素子76に電流を
流して発光させるよう制御するもので、半導体スイッチ
と電流制限のための抵抗器から成っている。受光回路8
2は、受光素子74の出力を増幅して論理レベルの信号
を出力するものである。
In FIG. 6, a drive circuit 80 controls the light emitting element 76 to emit light by passing a current therethrough, and is comprised of a semiconductor switch and a resistor for limiting the current. Light receiving circuit 8
Reference numeral 2 amplifies the output of the light receiving element 74 and outputs a logic level signal.

〔発明の効果〕〔Effect of the invention〕

本発明によれば次のような効果がある。 According to the present invention, there are the following effects.

(1)光出射用光ファイバの開口数を、受光用光ファイ
バの開口数より小さくしたので1反射光を効率よく受光
できるので、十分な受光信号が得られる。
(1) Since the numerical aperture of the optical fiber for light emission is made smaller than the numerical aperture of the optical fiber for light reception, one reflected light can be efficiently received, so that a sufficient light reception signal can be obtained.

(2)発光素子を高温にさらすことのない場所に置ける
ので、十分な発光出力が得られ、かつ、信頼性が高い。
(2) Since the light emitting element can be placed in a place where it will not be exposed to high temperatures, sufficient light emission output can be obtained and reliability is high.

(3)構造が単純で着脱容易であるので、故障時に修理
しやすい。
(3) Since the structure is simple and easy to attach and detach, it is easy to repair in the event of a breakdown.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の実施例を示す高圧配電器への回転角検
出器の取付構造図、第2図は回転円盤の形状図、第3図
は検出用ヘッドの構造図、第4図は上記ヘッドの端面を
表わす図、第5図は光ケーブルのコネクタの構造図、第
6図は光電変換器の構造図、第7図は上記ヘッド端面で
の人出射光の方向を示す図である。 32・・・円盤、34・・・ヘッド、36・・・光ケー
ブル。 38・・・コネクタ、54・・・第1の光ファイバ、5
6a〜56f・・・第2の光ファイバ、76・・・発光
素子、昂1図 42−41功ゲ 孫 2I21 第4121
Fig. 1 is a structural diagram for mounting a rotation angle detector on a high-voltage power distribution device showing an embodiment of the present invention, Fig. 2 is a diagram of the shape of a rotating disk, Fig. 3 is a structural diagram of a detection head, and Fig. 4 is a structural diagram of a rotation angle detector to a high-voltage power distributor. 5 is a diagram showing the structure of the optical cable connector, FIG. 6 is a diagram showing the structure of the photoelectric converter, and FIG. 7 is a diagram showing the direction of light emitted from the head at the end surface of the head. 32... Disc, 34... Head, 36... Optical cable. 38... Connector, 54... First optical fiber, 5
6a-56f...Second optical fiber, 76...Light emitting element, Ngong 1 Figure 42-41 Gong Gesun 2I21 No. 4121

Claims (1)

【特許請求の範囲】[Claims] 1.回転体,光照射手段、および受光手段を有する回転
角検出器において、前記照射手段を発光素子と第一の光
フアイバで構成し、前記受光手段を受光素子と第二の光
フアイバで構成し、前記第二の光フアイバの開口数を前
記第一の光フアイバの開口数よりも大なるものとしたこ
とを特徴とする回転角検出器。
1. A rotation angle detector having a rotating body, a light irradiation means, and a light receiving means, wherein the irradiation means is composed of a light emitting element and a first optical fiber, and the light receiving means is composed of a light receiving element and a second optical fiber, A rotation angle detector characterized in that the numerical aperture of the second optical fiber is larger than the numerical aperture of the first optical fiber.
JP13809887A 1987-06-03 1987-06-03 Rotation angle detector Pending JPS63302305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13809887A JPS63302305A (en) 1987-06-03 1987-06-03 Rotation angle detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13809887A JPS63302305A (en) 1987-06-03 1987-06-03 Rotation angle detector

Publications (1)

Publication Number Publication Date
JPS63302305A true JPS63302305A (en) 1988-12-09

Family

ID=15213903

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13809887A Pending JPS63302305A (en) 1987-06-03 1987-06-03 Rotation angle detector

Country Status (1)

Country Link
JP (1) JPS63302305A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6476377B1 (en) * 1998-10-30 2002-11-05 Structural Integrity Monitoring Systems, Inc. Structural monitoring system
EP1913867A1 (en) * 2006-10-19 2008-04-23 Sumitomo Electric Industries, Ltd. Optical measuring device and optical measuring method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6476377B1 (en) * 1998-10-30 2002-11-05 Structural Integrity Monitoring Systems, Inc. Structural monitoring system
US6703600B1 (en) * 1998-10-30 2004-03-09 Malcolm H. Hodge Structural monitoring apparatus
EP1913867A1 (en) * 2006-10-19 2008-04-23 Sumitomo Electric Industries, Ltd. Optical measuring device and optical measuring method

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