JPS61231412A - Photoelectric type encoder using optical fiber - Google Patents
Photoelectric type encoder using optical fiberInfo
- Publication number
- JPS61231412A JPS61231412A JP7252785A JP7252785A JPS61231412A JP S61231412 A JPS61231412 A JP S61231412A JP 7252785 A JP7252785 A JP 7252785A JP 7252785 A JP7252785 A JP 7252785A JP S61231412 A JPS61231412 A JP S61231412A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical fiber
- signal
- signal processing
- monitor
- 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
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 58
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims description 27
- 230000008054 signal transmission Effects 0.000 claims description 15
- 230000000694 effects Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 15
- 230000003287 optical effect Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 11
- 230000005856 abnormality Effects 0.000 description 8
- 239000000835 fiber Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation
- G01D5/34715—Scale reading or illumination devices
- G01D5/34723—Scale reading or illumination devices involving light-guides
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明、は光伝送に光ファイバを用いた光電式エンコー
ダ、特に光の全伝送経路における光量変動の影響を補正
することができ、あわせて該伝送経路における異常の検
出を行うことができる光ファ ゛イバを用いた光電式
エンコーダに関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a photoelectric encoder using an optical fiber for optical transmission, and in particular, to a photoelectric encoder that can correct the influence of light intensity fluctuations in the entire optical transmission path. The present invention relates to a photoelectric encoder using an optical fiber that can detect abnormalities in the transmission path.
［従来の技術］
近年においては、回転体の回転位置検出器として光の伝
送に光ファイバを使用した光電式エンコーダが数多く実
用化されている。かかるエンコーダは、光源及び受光素
子並びに信号処理電子回路を含む信号処理部を、温度上
昇や振動等を生ずる回転線近傍の悪環境条件下にあるエ
ンコーダ本体から引き離すことにより、高い信頼性を得
ることができるようになってきた。[Prior Art] In recent years, many photoelectric encoders that use optical fibers to transmit light have been put into practical use as rotational position detectors for rotating bodies. Such an encoder can achieve high reliability by separating the signal processing unit, including the light source, light receiving element, and signal processing electronic circuit, from the encoder body, which is located in an adverse environmental condition near the rotation line where temperature rises, vibrations, etc. occur. It has become possible to do this.
ところで、上記のような光ファイバを用いた光電式エン
コーダでは、例えば光源の光量変動や、光フアイバケー
ブルの屈曲等に基づ（光の漏洩等の光伝送経路における
光量変動がエンコーダの性能を左右しかねない。By the way, in a photoelectric encoder using an optical fiber as described above, the performance of the encoder is affected by changes in the light amount in the optical transmission path, such as light leakage, due to changes in the light amount of the light source, bends in the optical fiber cable, etc. There is no other way.
このため、例えば特開昭５６−８７８１８号公報に示さ
れるように、光源からの光を直接、信号処理回路へフィ
ードバックさせて、光源の光ｍ変動の影響を補正する手
段が提案されている。For this reason, for example, as disclosed in Japanese Patent Application Laid-Open No. 56-87818, a means has been proposed for directly feeding back the light from the light source to a signal processing circuit to correct the influence of the fluctuation in light m of the light source.
また、別の手段として、例えば特公昭５７−５２６４０
号公報に示されるように、二相の光信号の位相差を利用
して回転位置検出を行う光電式エンコーダが提案され、
光量変動の影響が防止されている。In addition, as another means, for example, Special Publication No. 57-52640
As shown in the publication, a photoelectric encoder has been proposed that detects rotational position using the phase difference between two-phase optical signals.
The effects of light intensity fluctuations are prevented.
［発明が解決しようとする問題点］
しかしながら、前者の手段では、光源の光ｍ変動の影響
については補正することができるものの、光フアイバケ
ーブル途中における光ｍ変動の影響は補正しきれず、光
量変動が検出値に及ぼす影響を十分に補正することがで
きないという欠点を有している。[Problems to be Solved by the Invention] However, with the former method, although it is possible to compensate for the influence of light m fluctuations from the light source, it is not possible to fully compensate for the influence of light m fluctuations in the middle of the optical fiber cable. This method has the disadvantage that it is not possible to sufficiently correct the influence of the detected value on the detected value.
また、後者の手段では、発光素子、受光素子、及び光電
変換器として、同一形式の素子を２個ずつ設けなければ
、検出誤差を防止することができず、しかも装置が複雑
化するという欠点を有している。In addition, the latter method has the disadvantage that detection errors cannot be prevented unless two elements of the same type are provided as the light emitting element, the light receiving element, and the photoelectric converter, and the apparatus becomes complicated. have.
更に、両者の手段とも、光の伝送経路途中における異常
（例えば、ケーブルの断線）を適確に検出することがで
きないという欠点を有している。Furthermore, both methods have the disadvantage that they cannot accurately detect an abnormality (for example, a cable break) in the optical transmission path.
本発明は前述した従来の問題に鑑み為されたものであり
、その目的は、装置を複雑化せずに、光源の光Ｒ変動の
みならず、光の全伝送経路における光量変動の影響を適
確に補正することができ、あわせて光の伝送経路におけ
る異常を容易に検出することができる光ファイバを用い
た光電式エンコーダを提供することにある。The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to compensate for not only the light R fluctuation of the light source but also the influence of the light amount fluctuation on the entire light transmission path without complicating the device. It is an object of the present invention to provide a photoelectric encoder using an optical fiber that can perform accurate correction and also easily detect abnormalities in a light transmission path.
［問題点を解決するための手段〕
上記の問題点を解決するための本発明の構成を、実施例
に対応する第１図〜第３図（＾）、 （Ｂ）を用いて以
下に説明する。本発明に係る光ファイバを用いた光電式
エンコーダは、光源よりの光を受けて検出信号を生ずる
固定ディスク１２及び回転ディスク１１を有するエンコ
ーダ本体１と、光源及び受光部並びに信号処理電子回路
を有する信号処理部２と、前記エンコーダ本体１と信号
処理部２との間で光信号の伝送を行う信号伝送用光ファ
イバ３とを備えて回転体の回転位置を検出する光ファイ
バを用いた光電式エンコーダにおいて、少なくとも前記
回転ディスク１１に光ｍ変動を検出するためのモニター
用パターン１１ｂを形成するとともに、該モニター用パ
ターン１１ｂと前記信号処理部２との間でモニター光の
伝送を行うモニター用光ファイバ４を設け、該モニター
用光ファイバ４を前記信号伝送用光ファイバ３に沿わせ
て配置したものである。[Means for solving the problems] The configuration of the present invention for solving the above problems will be explained below using FIGS. 1 to 3 (^) and (B) corresponding to the embodiments. do. A photoelectric encoder using an optical fiber according to the present invention includes an encoder main body 1 having a fixed disk 12 and a rotating disk 11 that receive light from a light source and generate a detection signal, a light source, a light receiving section, and a signal processing electronic circuit. A photoelectric type using an optical fiber that includes a signal processing section 2 and a signal transmission optical fiber 3 that transmits optical signals between the encoder main body 1 and the signal processing section 2, and detects the rotational position of a rotating body. In the encoder, at least a monitor pattern 11b is formed on the rotating disk 11 to detect variations in light m, and a monitor light is transmitted between the monitor pattern 11b and the signal processing section 2. A fiber 4 is provided, and the monitoring optical fiber 4 is arranged along the signal transmission optical fiber 3.
［作用］
本発明は上記の手段により、モニター用光ファイバ４が
信号伝送用光ファイバ３と同様な屈曲状態となるので、
信号伝送用光ファイバ２の屈曲等に基づく光量変動を、
モニター用光フアイバ４内を通過するモニター光の変動
により検出することができる。また、光源の光量変動も
モニター光に現われるので、モニター光の検出結果に基
づいて光ｍ変動が検出値に及ぼす影響を適確に補正する
ことができる。[Function] According to the present invention, the monitoring optical fiber 4 is bent in the same manner as the signal transmission optical fiber 3 by the above means.
Fluctuations in light intensity due to bending of the signal transmission optical fiber 2, etc.
It can be detected by the fluctuation of the monitor light passing through the monitor optical fiber 4. Furthermore, since variations in the amount of light from the light source also appear in the monitor light, it is possible to accurately correct the influence of variations in light m on the detected value based on the detection results of the monitor light.
また、光の伝送経路において異常（例えば、光ファイバ
３．４の断線）が生じた場合、モニター光が異常信号と
なって現われるので、光伝送経路の異常検出を容易に行
うことができる。Further, if an abnormality occurs in the optical transmission path (for example, a break in the optical fiber 3.4), the monitor light appears as an abnormal signal, so that abnormality in the optical transmission path can be easily detected.
［実施例］
以下、図面に基づいて本発明の実施例を詳細に説明する
。第１図において、１は回転入力軸１ａを有するエンコ
ーダ本０体、２は信号処理部で、この信号処理部には光
源、受光素子、及び光電変換器を含む信号処理電子回路
が設けられている。３は信号伝送用光ファイバ、４はモ
ニター用光ファイバであり、光ファイバ４は光ファイバ
３に沿わせて配置されていて、エンコーダ本体１と信号
処理部２とは両光ファイバ３．４によって連結されてい
る。光ファイバ３．４はいずれも多数本のファイバ素子
の集合体からなり、該各集会体中のほぼ半数のファイバ
素子が信号処理部２からの光をエンコーダ本体１に伝送
し、残りの数のファイバ素子がエンコーダ本体１からの
光を信号処理部２へ伝送する役目をする。５は両光ファ
イバ３，４を一括して被覆している保護被覆である。エ
ンコーダ本体１には第２図に示したように、回転ディス
ク１１と該回転ディスクの一部に対向する固定ディスク
１２が内蔵されている。[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings. In FIG. 1, 1 is an encoder body having a rotary input shaft 1a, 2 is a signal processing section, and this signal processing section is provided with a signal processing electronic circuit including a light source, a light receiving element, and a photoelectric converter. There is. 3 is an optical fiber for signal transmission, and 4 is an optical fiber for monitoring. The optical fiber 4 is arranged along the optical fiber 3, and the encoder main body 1 and the signal processing section 2 are connected by both optical fibers 3.4. connected. Each of the optical fibers 3.4 consists of an assembly of a large number of fiber elements, and approximately half of the fiber elements in each assembly transmit the light from the signal processing section 2 to the encoder main body 1, and the remaining number The fiber element serves to transmit light from the encoder body 1 to the signal processing section 2. 5 is a protective coating that collectively covers both optical fibers 3 and 4. As shown in FIG. 2, the encoder main body 1 includes a rotating disk 11 and a fixed disk 12 that partially opposes the rotating disk.
第３図（Ａ）は回転ディスク１１の、また第３図（Ｂ）
は固定ディスク１２の各構成の一例を示したもので、い
ずれも光透過材により回転ディスク１１は円板状、固定
ディスク１２はほぼ矩形板状に形成されている。１１ａ
は回転ディスク１１の周辺に円周方向に線状の光反射物
質を小間隔を隔てて多数列設してなる信号形成用パター
ン、１１ｂは該パターン１１ａの内周側に所定の幅で円
周方向に連続的に形成された光反射物質からなる光量変
動検出のためのモニター用パターンである。１２ａは上
記信号形成用パターン１１ａの一部に対向するように固
定ディスク１２の一部に形成された信号形成用パターン
である。このパターン１２ａは、所定の面積部分に線状
の光遮断物質を小間隔を隔てて複数列設してなるもので
ある。固定ディスク１２の前記モニター用パターン１１
ｂに対向する部分１２ｂは、該固定ディスクの構成材そ
のままとして光透過機能をもたせである。FIG. 3(A) shows the rotating disk 11, and FIG. 3(B)
1 shows an example of each structure of the fixed disk 12, in which the rotating disk 11 is formed into a disk shape and the fixed disk 12 is formed into a substantially rectangular plate shape, both of which are made of a light-transmitting material. 11a
11b is a signal forming pattern formed by arranging a large number of linear light-reflecting substances at small intervals in the circumferential direction around the rotating disk 11, and 11b is a signal forming pattern having a predetermined width on the inner circumferential side of the pattern 11a. This is a monitoring pattern for detecting light amount fluctuations, which is made of a light reflecting material formed continuously in the direction of the image. 12a is a signal forming pattern formed on a part of the fixed disk 12 so as to face a part of the signal forming pattern 11a. This pattern 12a is made up of a plurality of rows of linear light-blocking substances spaced apart from each other in a predetermined area. The monitor pattern 11 on the fixed disk 12
The portion 12b facing b is made of the constituent material of the fixed disk and has a light transmitting function.
第２図に示したように、前記信号伝送用光ファイバ３は
、そのエンコーダ本体側端部が固定ディスク１２の信号
形成用パターン１２ａを介して回転ディスク１１の信号
形成用パターン１１ａに対向するように配置されていて
、信号処理部２とエンコーダ本体１との間で検出用光信
号の伝送を行う機能を有している。また、モニター用光
ファイバ４は、そのエンコーダ本体側端部が固定ディス
ク１２の一部１２ｂを介して回転ディスク１１のモニタ
ー用パターン１１ｂに対向するように配置されていて、
信号処理部２とエンコーダ本体１との間でモニター光の
伝送を行う機能を有している。As shown in FIG. 2, the signal transmission optical fiber 3 is arranged such that its encoder body side end faces the signal forming pattern 11a of the rotating disk 11 via the signal forming pattern 12a of the fixed disk 12. It has a function of transmitting a detection optical signal between the signal processing section 2 and the encoder main body 1. Further, the monitoring optical fiber 4 is arranged such that its encoder main body side end faces the monitoring pattern 11b of the rotating disk 11 via a part 12b of the fixed disk 12,
It has a function of transmitting monitor light between the signal processing section 2 and the encoder main body 1.
このような構成において、信号処理部２内の光源からの
光は信号伝送用光ファイバ３によって、前記の信号形成
用パターン１１ａ、１２ａの部分に導かれる。そして、
これらのパターンによる反射光が回転ディスク１１の回
転に応じた回転位置検出信号として、再び信号伝送用光
ファイバ３を通って信号処理部２の受光素子に導かれ、
光電変換器を含む信号処理電子回路により信号処理され
て、電気的な回転位置検出が行われる。また、前記の光
源からの光の一部はモニター光として、モニター用光フ
ァイバ４によって、前記のモニター用パターン１１ｂの
部分に導かれる。そして、このパターン１１ｂからの反
射光は再びモニター用光ファイバ４を通って信号処理部
２のモニター用受光素子に導かれ、モニター用光電変換
器及び電子回路により信号処理されて定レベルのモニタ
ー出力信号となる。そして、この信号のレベル変動に基
づいて光量変動の検出が行われ、この検出結果に基づい
て、回転位置検出信号の補正が行われる。In such a configuration, light from a light source in the signal processing unit 2 is guided to the signal forming patterns 11a and 12a by the signal transmission optical fiber 3. and,
The reflected light from these patterns is guided again to the light receiving element of the signal processing section 2 through the signal transmission optical fiber 3 as a rotational position detection signal corresponding to the rotation of the rotating disk 11.
The signal is processed by a signal processing electronic circuit including a photoelectric converter to perform electrical rotational position detection. A part of the light from the light source is guided as monitor light to the monitor pattern 11b by the monitor optical fiber 4. The reflected light from this pattern 11b is guided again through the monitoring optical fiber 4 to the monitoring light-receiving element of the signal processing unit 2, and is signal-processed by the monitoring photoelectric converter and electronic circuit to output a constant level monitor output. It becomes a signal. Then, a variation in light amount is detected based on the level variation of this signal, and the rotational position detection signal is corrected based on the detection result.
前述のように、本実施例においては、モニター用光ファ
イバ４が信号伝送用光ファイバ３に沿わせて配置され、
両者が一括して被覆されているので、両者は同様な屈伸
姿態をとる。これにより、光源の光ｍ変動のみならず、
光の全伝送経路における光ｍ変動の影響を補正すること
ができる。例えば、信号伝送用光ファイバ３が屈曲して
受光素子に到達する光量が減少した場合、モニター用光
ファイバ４も同様に屈曲して同様に伝送光分が所定値よ
りも減少する。これにより光伝送経路の光ｍ変動を検出
することができ、この光量変動の検出結果に基づいて回
転位置検出信号を補正することかできる。As mentioned above, in this embodiment, the monitoring optical fiber 4 is arranged along the signal transmission optical fiber 3,
Since both are covered together, both take the same bending and stretching posture. This not only changes the light m of the light source, but also
It is possible to correct the influence of light m fluctuations on the entire light transmission path. For example, when the signal transmission optical fiber 3 is bent and the amount of light reaching the light receiving element is reduced, the monitoring optical fiber 4 is also bent and the amount of transmitted light is similarly reduced below a predetermined value. As a result, it is possible to detect variations in light m in the optical transmission path, and it is possible to correct the rotational position detection signal based on the detection result of this variation in light quantity.
また、本実施例においては、光の伝送経路における異常
、例えば光ファイバ３．４の断線時には、モニター光が
受光素子に到達しなくなるので、光伝送経路の異常を検
出することができる。Furthermore, in this embodiment, in the event of an abnormality in the optical transmission path, for example, when the optical fiber 3.4 is disconnected, the monitor light will no longer reach the light receiving element, making it possible to detect an abnormality in the optical transmission path.
なお、以上説明した実施例はロータリーエンコーダに関
するものであるが、本発明はこれに限るものではなく、
リニヤエンコーダにも適用できることは言うまでもない
。Note that although the embodiment described above relates to a rotary encoder, the present invention is not limited to this.
Needless to say, it can also be applied to linear encoders.
また、上述の実施例では固定ディスク１２の構成素材に
光透過材を用いたので、該固定ディスクが回転ディスク
１１のモニター用パターン１１ｂ及びモニター用光ファ
イバ４の一端に対向する所定の部分１２ｂを光透過素材
のままとしたが、固定ディスク１２を光遮断材で構成し
たときには、上記の部分１２ｂは透明又は窓部として、
モニター用光ファイバ４とモニター用パターン１１ｂと
の間に光の授受を行わせるものとする。Furthermore, in the above-described embodiment, since a light transmitting material is used as the constituent material of the fixed disk 12, the fixed disk has a predetermined portion 12b facing the monitoring pattern 11b of the rotating disk 11 and one end of the monitoring optical fiber 4. Although the fixed disk 12 is made of a light-transmitting material, when the fixed disk 12 is made of a light-blocking material, the above-mentioned portion 12b may be made transparent or a window portion.
It is assumed that light is exchanged between the monitoring optical fiber 4 and the monitoring pattern 11b.
更に、上述の実施例では回転ディスク１１の構成素材に
光透過材を用い、該ディスクの信号形成用パターン１１
ａを光反射物質で形成したが、回転ディスク１１の構成
素材に光反射材を用い、信号形成用パターン１１ａを光
吸収材により形成してもよい。この場合、モニター用パ
ターン１１ｂには回転ディスク１１の光反射表面がその
まま利用される。Furthermore, in the above embodiment, a light transmitting material is used as the constituent material of the rotating disk 11, and the signal forming pattern 11 of the disk is
Although a is made of a light-reflecting material, the rotating disk 11 may be made of a light-reflecting material, and the signal forming pattern 11a may be made of a light-absorbing material. In this case, the light reflecting surface of the rotating disk 11 is used as it is for the monitor pattern 11b.
［発明の効果］
以上説明したように、本発明によれば、少なくとも回転
ディスクに光量変動を検出するためのモニター用パター
ンを形成すると共に、信号処理部と上記モニター用パタ
ーンとの間でモニター光の伝送を行うモニター用光ファ
イバを設け、該モニター用光ファイバを信号伝送用光フ
ァイバに沿わせて配置したので、信号伝送用光ファイバ
の屈曲による光量変動を、該光ファイバに沿って同様に
屈曲するモニター用光ファイバによる光量変動に基づい
て検出することができる。これにより、装置を複雑化す
ることなく、光源の光量変動は勿論、光の全伝送経路に
おける光量変動をモニター光に基づき検出して、回転位
置検出信号を適確に補正することができ、あわせて光伝
送経路の異常を容易に検出することができる。[Effects of the Invention] As described above, according to the present invention, at least a monitoring pattern for detecting variations in light amount is formed on the rotating disk, and the monitoring pattern is transmitted between the signal processing section and the monitoring pattern. A monitoring optical fiber is provided, and the monitoring optical fiber is placed along the signal transmission optical fiber, so that the fluctuation in light amount due to the bending of the signal transmission optical fiber can be suppressed in the same way along the optical fiber. Detection can be performed based on changes in the amount of light caused by a bent monitoring optical fiber. As a result, without complicating the device, it is possible to detect not only the light intensity fluctuations of the light source but also the light intensity fluctuations in the entire light transmission path based on the monitor light, and to accurately correct the rotational position detection signal. Abnormalities in the optical transmission path can be easily detected.
第１図は本発明の実施例を示す説明図、第２図は本実施
例のエンコーダ本体における固定ディスク、回転ディス
ク、及び光ファイバの配置要領を示す説明図、第３図（
Ａ）は上記の回転ディスクの構成例、また第３図（Ｂ）
は固定ディスクの構成例をそれぞれ示す正面図である。
１・・・エンコーダ一本体、２・・・信号処理部、３・
・・信号伝送用光ファイバ、４・・・モニター用光ファ
イバ、５・・・保護被覆、１１・・・回転ディスク、１
１ｂ・・・モニター用パターン、１２・・・固定ディス
ク。FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the arrangement of a fixed disk, a rotating disk, and an optical fiber in the encoder body of this embodiment, and FIG.
A) is an example of the configuration of the above-mentioned rotating disk, and FIG. 3(B)
FIG. 3 is a front view showing an example of the configuration of a fixed disk. 1... Encoder main body, 2... Signal processing section, 3...
... Optical fiber for signal transmission, 4... Optical fiber for monitoring, 5... Protective coating, 11... Rotating disk, 1
1b...monitor pattern, 12...fixed disk.
Claims (1)
び回転ディスクを有するエンコーダ本体と、光源及び受
光部並びに信号処理電子回路を有する信号処理部と、前
記エンコーダ本体と信号処理部との間で光信号の伝送を
行う信号伝送用光ファイバとを備えて回転体の回転位置
を検出する光ファイバを用いた光電式エンコーダにおい
て、少なくとも前記回転ディスクに光量変動を検出する
ためのモニター用パターンを形成するとともに、該モニ
ター用パターンと前記信号処理部との間でモニター光の
伝送を行うモニター用光ファイバを設け、該モニター用
光ファイバを前記信号伝送用光ファイバに沿わせて配置
したことを特徴とする光ファイバを用いた光電式エンコ
ーダ。An encoder main body has a fixed disk and a rotating disk that receive light from a light source and generate a detection signal, a signal processing section that has a light source, a light receiving section, and a signal processing electronic circuit, and a signal processing section that transmits light between the encoder main body and the signal processing section. In a photoelectric encoder using an optical fiber that is equipped with a signal transmission optical fiber that transmits signals and detects the rotational position of a rotating body, at least a monitoring pattern for detecting changes in light amount is formed on the rotating disk. Additionally, a monitoring optical fiber for transmitting monitoring light between the monitoring pattern and the signal processing section is provided, and the monitoring optical fiber is arranged along the signal transmission optical fiber. A photoelectric encoder using optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7252785A JPS61231412A (en) | 1985-04-08 | 1985-04-08 | Photoelectric type encoder using optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7252785A JPS61231412A (en) | 1985-04-08 | 1985-04-08 | Photoelectric type encoder using optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61231412A true JPS61231412A (en) | 1986-10-15 |
Family
ID=13491893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7252785A Pending JPS61231412A (en) | 1985-04-08 | 1985-04-08 | Photoelectric type encoder using optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61231412A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5687818A (en) * | 1979-12-19 | 1981-07-16 | Ishikawajima Harima Heavy Ind Co Ltd | Reflex type position detector |
| JPS6057211A (en) * | 1983-05-25 | 1985-04-03 | カミノ ラボラトリ−ズ インコ−ポレ−テツド | Fiber optic converter |
-
1985
- 1985-04-08 JP JP7252785A patent/JPS61231412A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5687818A (en) * | 1979-12-19 | 1981-07-16 | Ishikawajima Harima Heavy Ind Co Ltd | Reflex type position detector |
| JPS6057211A (en) * | 1983-05-25 | 1985-04-03 | カミノ ラボラトリ−ズ インコ−ポレ−テツド | Fiber optic converter |
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