JPS62108112A - Optical encoder - Google Patents
Optical encoderInfo
- Publication number
- JPS62108112A JPS62108112A JP60248052A JP24805285A JPS62108112A JP S62108112 A JPS62108112 A JP S62108112A JP 60248052 A JP60248052 A JP 60248052A JP 24805285 A JP24805285 A JP 24805285A JP S62108112 A JPS62108112 A JP S62108112A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical
- shielding plate
- light shielding
- light receiving
- 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
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
- Optical Transform (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、透孔を設けた遮光板を介して投光手段と受光
手段とを対向せしめ、遮光板の動きを検知する構造の光
学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 provides an optical type having a structure in which a light projecting means and a light receiving means are opposed to each other through a light shielding plate provided with a transparent hole, and the movement of the light shielding plate is detected. It is related to encoders.
第３図はこの種の従来形の光学式エンコーダを説明する
ため、模式的に描いた斜視図である。FIG. 3 is a schematic perspective view for explaining this type of conventional optical encoder.
遮光板１は、回動軸２に固着されていて該軸２の回りに
回動する。The light shielding plate 1 is fixed to a rotation shaft 2 and rotates around the rotation shaft 2.
上記の遮光板１には透孔３ａ、 ３ｂ、 ３ｃが設けら
れていて、これらの透孔は遮光板１の回動に伴って同心
円状の軌跡（図示せず）を描く。The light-shielding plate 1 is provided with through holes 3a, 3b, and 3c, and these through-holes draw concentric trajectories (not shown) as the light-shielding plate 1 rotates.
上記の透孔３ｍ、 ３ｂ、 ３ｅそれぞれの軌跡に交ら
しめて３本の光軸Ｌａ ＋ Ｌｂ ＊ Ｌｅが設定され
、これらの光軸に沿って、それぞれ発光素子４ｍ、 ４
ｂ、 ４ｃと、受光素子５ａ、 ５ｂ、 ５ｃとが対向
設置されている。Three optical axes La+Lb*Le are set to intersect with the trajectories of the above-mentioned through holes 3m, 3b, and 3e, and along these optical axes, light emitting elements 4m and 4 are arranged, respectively.
b, 4c and light receiving elements 5a, 5b, 5c are placed facing each other.
以上のように構成された従来形の光学式エンコーダは、
監視対象である部材（図示せず）の動きを回動軸２を介
して遮光板ＩＫ伝動して用いられる。そして、監視対象
部材の動きに比例して遮光板１が回動すると、各光軸Ｌ
ａ、 Ｌｂ、 Ｌｃに沿りた投。The conventional optical encoder configured as above is
The movement of a member to be monitored (not shown) is transmitted to the light shielding plate IK via the rotation shaft 2 and used. When the light shielding plate 1 rotates in proportion to the movement of the member to be monitored, each optical axis L
Throws along a, Lb, Lc.
受光が遮られたり遮られなかったりする。その状態は受
光素子５ａ、 ｓｂ、 ５ｃの検出信号として捉えられ
る。Light reception may or may not be blocked. The state is captured as a detection signal of the light receiving elements 5a, sb, and 5c.
上記のような構造の従来形光学式エンコーダ（第３図）
においては、前述の各構成部材をケース６の中に収納す
ることになるので、装置が大型。Conventional optical encoder with the above structure (Figure 3)
In this case, each of the above-mentioned components is housed in the case 6, so the device is large.
大重量となり、その設置スペースや支持方法について実
用面での困難を伴う。It is heavy and has practical difficulties in terms of installation space and support method.
更に、発光素子および受光素子は温度条件の変化に伴っ
て特性が変わるので、ケース６内の温度変化を一定の範
囲内に抑制しなければならないが、遮光板１や回動軸２
等を一緒に収納しているケース６内の温度を制御するこ
とは簡単ではない。Furthermore, since the characteristics of the light-emitting element and the light-receiving element change with changes in temperature conditions, temperature changes within the case 6 must be suppressed within a certain range.
It is not easy to control the temperature inside the case 6 that houses these items together.
本発明は上述の事情に鑑みて為されたもので、設置所要
スに一スや支持構造についての制約が少なく、しかも発
光素子、受光素子の温度制御が容易な光学式エンコーダ
を提供しようとするものである。The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide an optical encoder that requires less space for installation and has fewer restrictions on support structure, and that allows easy temperature control of light emitting elements and light receiving elements. It is something.
上記の目的を達成するため、本発明に係る光学式エンコ
ーダは、監視対警動と連動する遮光板と、上記遮光板に
設けた光の進行を許容する手段とを有し、かつ、前記の
遮光板が動いたときの光進行許容手段の軌跡に交わらし
めて設定した光路に沿って投光手段及び受光手段を設け
た光学式エンコーダにおいて、前記の投光手段は光源を
備えた光ファイバーとし、かつ、前記の受光手段は受光
素子を備えた光ファイ・９−とし、上記双方の光ファイ
バーを前記の光軸に沿って対向せしめたことを特徴とす
る。In order to achieve the above object, an optical encoder according to the present invention includes a light shielding plate interlocked with monitoring and alarming, and a means provided on the light shielding plate for allowing light to travel, and the above-mentioned In an optical encoder that is provided with a light projecting means and a light receiving means along a light path set to intersect with the trajectory of the light traveling permitting means when the light shielding plate moves, the light projecting means is an optical fiber equipped with a light source, and , the light-receiving means is an optical fiber 9- equipped with a light-receiving element, and both of the optical fibers are opposed along the optical axis.
以上のように構成すると、光ファイバーの１端を遮光板
に近接せしめて設置すると共に他端を遮光板から離間せ
しめることができる。従って、該他端に対向せしめるべ
き発光素子、受光素子はケース外に設置することが可能
となり、ケースを小形、軽量に構成できるので該ケース
の設置スペース及び支持機構に関する制約が緩やかとな
り、かつ、発光素子、受光素子の温度制御が容易となろ
う〔実施例〕
第１図は本発明の光学式エンコーダの１実施例を模式的
に描いた斜視図である。With the above configuration, one end of the optical fiber can be installed close to the light shielding plate while the other end can be spaced apart from the light shielding plate. Therefore, the light-emitting element and the light-receiving element that should be opposed to the other end can be installed outside the case, and the case can be made smaller and lighter, so restrictions regarding the installation space and support mechanism of the case are relaxed, and Temperature control of the light-emitting element and the light-receiving element will be facilitated [Embodiment] FIG. 1 is a perspective view schematically depicting an embodiment of the optical encoder of the present invention.
本実施例は前記の従来例（第３図）に本発明を適用して
改良したものであって、第３図と同一の図面参照番号を
付したものは前記の従来例におけると同様、乃至は類似
の構成部分である。This embodiment is an improvement by applying the present invention to the conventional example (FIG. 3), and the same drawing reference numbers as in FIG. are similar components.
ケース６′外に発光素子４′を設置し、３本の送光用光
ファイバー７ａ、 ７ｂ、 ７ｃの各１端をそれぞれ発
光素子４′に対向せしめるとともに、その他端をそれぞ
れ光軸Ｌａ ＋ ”ｂ ｒ ”ｅに一致せしめて固定す
る。A light emitting element 4' is installed outside the case 6', one end of each of the three light transmission optical fibers 7a, 7b, and 7c is made to face the light emitting element 4', and the other ends are connected to the optical axis La+''b. r ” and fix it to match e.
本発明を実施する際、複数本の送光用ファイバーそれぞ
れに発光ダイオードを設置することもできるが、本例の
ように１個の発光ダイオード４′によって兼用すること
もできる。When carrying out the present invention, a light emitting diode can be installed in each of a plurality of light transmitting fibers, but it is also possible to use a single light emitting diode 4' as in this example.
一方、３個の受光素子５ｍ’、 ５ｂ’、 ５ｃ’をそ
れぞれケース６′外に設置し、３本の受光用光ファイバ
ー８ａ、 ８ｂ、 ８ｃそれぞれの各１端を受光素子５
ｍ’、５ｂ’。On the other hand, three light-receiving elements 5m', 5b', and 5c' are installed outside the case 6', and one end of each of the three light-receiving optical fibers 8a, 8b, and 8c is connected to the light-receiving element 5.
m', 5b'.
５ｃ’に対向せしめるとともに、これら受光用光ファイ
・々−の各他端をそれぞれ光軸Ｌａ、 Ｉ４）、 Ｌｃ
に一致せしめ、前記３本の送光用光ファイバー７ｍ、
７ｂ。5c', and the other ends of these light-receiving optical fibers are connected to optical axes La, I4), and Lc, respectively.
The three light transmitting optical fibers are 7 m long,
7b.
７ｃに対して、遮光板１を介して正対せしめる。7c through the light shielding plate 1.
以上のように構成した本実施例の光学式エンコーダ（第
１図）においては、発光素子４′から出射した光は送光
用光ファイバー７ａ、 ７ｂ、 ７ｅを介して光軸り、
、Ｌｂ、Ｌｃに沿って投光され、遮光板１の透孔を通過
した場合は受光用光ファイ／？ −８１，３ｂ。In the optical encoder of this embodiment (FIG. 1) configured as described above, the light emitted from the light emitting element 4' is directed along the optical axis via the light transmitting optical fibers 7a, 7b, and 7e.
, Lb, and Lc, and when the light passes through the through hole of the light shielding plate 1, the receiving optical fiber/? -81,3b.
８ｃを介して受光素子５ｍ’、 ５ｂ’、 ５ｃ’に入
射し、遮光板１によって遮られた場合は受光素子に入射
しない。従って、受光素子５ｍ’、 ５ｂ’、 ５ｃ’
の出力信号によって遮光板１０回動角を検知することが
できる。The light enters the light receiving elements 5m', 5b', and 5c' via the light receiving element 8c, and does not enter the light receiving element when blocked by the light shielding plate 1. Therefore, the light receiving elements 5m', 5b', 5c'
The rotation angle of the light shielding plate 10 can be detected by the output signal.
そして、本実施例における発光素子４′、及び受光素子
５ｍ’、 ５ｂ’、 ５ｃ’はケース６′外に設置しで
あるので、ケース６′は小形、軽量であり、その設置ス
ーースや支持構造についての制約が緩やかであるため、
実用に供し易い。Further, in this embodiment, the light emitting element 4' and the light receiving elements 5m', 5b', and 5c' are installed outside the case 6', so the case 6' is small and lightweight, and its installation smoothness and support structure are reduced. Since the restrictions on
Easy to put into practical use.
また、発光素子４′および受光素子５ａ’、 ５ｂ’、
５ｃ’はケース６′外に設置するため、温度制御の手
段を設けるについて設計的自由度が大きい。In addition, the light emitting element 4' and the light receiving elements 5a', 5b',
5c' is installed outside the case 6', so there is a large degree of design freedom in providing temperature control means.
本実施例（第１図）における光学式エンコーダはアブソ
リュート型に構成しであるが、本発明を実施する場合、
インクリメンタル型に構成することもできる。The optical encoder in this embodiment (FIG. 1) is configured as an absolute type, but when implementing the present invention,
It can also be configured as an incremental type.
また、本実施例（第１図）の遮光板Ｉは、送光用光ファ
イバーから出射した光の進行を許容する手段として透孔
を設けたが、本発明を実施する際、上記の透孔に代えて
ミラーを設けることもできる。In addition, the light shielding plate I of this embodiment (FIG. 1) was provided with a through hole as a means for allowing the light emitted from the light transmitting optical fiber to proceed. A mirror can also be provided instead.
この場合、投光手段としての送光用光ファイバーと、受
光手段としての受光用光ファイバーとは、遮光板に関し
て同じ側に設けることとなる。またこの場合においては
、光軸はミラー面で折り返す形となる。本発明において
、光進行許容手段と光軸とを交わらしめるとは、折り返
すことを含む意である。In this case, the light transmitting optical fiber as the light projecting means and the light receiving optical fiber as the light receiving means are provided on the same side with respect to the light shielding plate. In this case, the optical axis is folded back at the mirror surface. In the present invention, intersecting the light traveling permitting means and the optical axis includes turning the optical axis.
第２図は前記と異なる実施例を示す。本例の遮光板１′
は矢印Ｕ、 Ｄの如く上下に移動する構造である。本
例のように構成すればリニアエンコーダとして機能し得
る。FIG. 2 shows a different embodiment from the above. Light shielding plate 1' of this example
is a structure that moves up and down as shown by arrows U and D. If configured as in this example, it can function as a linear encoder.
以上詳述したように、本発明の光学式エンコーダを適用
すると、設置所要スペースや支持構造忙ついての制約が
少なく、しかも発光素子、受光素子の温度制御が容易で
あるという優れた実用的効果を奏する。As detailed above, when the optical encoder of the present invention is applied, it has excellent practical effects in that there are fewer restrictions regarding the space required for installation and support structure, and it is easy to control the temperature of the light emitting element and light receiving element. play.
第１図は本発明の光学式エンコーダの１実施例を示し、
模式的に描いた斜視図である。
第２図は上記と異なる実施例の模式的な斜視図、第３図
は従来例の光学式エンコーダの模式的な斜視図である。
１．１’・・・遮光板、３ｍ、 ３ｂ、 ３ｃ、 ３ａ
’、 ３ｂ’、 ３ｃ’−光の進行を許容する１手段と
しての透孔、４′・・・発光素子、５ａ’、 ５ｂ’、
５ｃ’−受光素子、７ＪＬ、 ７ｂ、 ７ｃｍ送光用
光フアイバー、８ｍ、 ８ｂ、 ８ｅ・・・受光用光フ
ァイバー、Ｌｌ ＋ Ｌｌに’ ＋ Ｌｂ ＋ Ｌｂ’
ｒ Ｌｅ ＋ Ｌｅ””光軸。FIG. 1 shows one embodiment of the optical encoder of the present invention,
FIG. 2 is a schematic perspective view. FIG. 2 is a schematic perspective view of an embodiment different from the above, and FIG. 3 is a schematic perspective view of a conventional optical encoder. 1.1'... Light shielding plate, 3m, 3b, 3c, 3a
', 3b', 3c'--through hole as a means for allowing light to travel, 4'...light emitting element, 5a', 5b',
5c' - Light receiving element, 7JL, 7b, 7cm optical fiber for light transmission, 8m, 8b, 8e... Optical fiber for light reception, Ll + Ll' + Lb + Lb'
r Le + Le"" optical axis.
Claims (1)
を許容する手段とを有し、かつ、前記の遮光板が動いた
ときの光進行許容手段の軌跡に交わらしめて設定した光
路に沿って投光手段及び受光手段を設けた光学式エンコ
ーダにおいて、前記の投光手段は光源を備えた光ファイ
バーとし、かつ、前記の受光手段は受光素子を備えた光
ファイバーとし、上記双方の光ファイバーを前記の光軸
に沿って対向せしめたことを特徴とする光学式エンコー
ダ。It has a light shielding plate which is a movable member, and a means provided on the light shielding plate for allowing the light to travel, and the optical path is set to intersect with the trajectory of the light traveling allowing means when the light shielding plate moves. In an optical encoder provided with a light projecting means and a light receiving means along the optical fiber, the light projecting means is an optical fiber equipped with a light source, the light receiving means is an optical fiber equipped with a light receiving element, and both optical fibers are connected to the optical fiber. An optical encoder characterized in that the optical encoders are arranged opposite to each other along the optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60248052A JPS62108112A (en) | 1985-11-07 | 1985-11-07 | Optical encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60248052A JPS62108112A (en) | 1985-11-07 | 1985-11-07 | Optical encoder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62108112A true JPS62108112A (en) | 1987-05-19 |
Family
ID=17172480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60248052A Pending JPS62108112A (en) | 1985-11-07 | 1985-11-07 | Optical encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62108112A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01154413U (en) * | 1988-04-18 | 1989-10-24 | ||
| JPH02146949A (en) * | 1988-11-28 | 1990-06-06 | Matsushita Electric Ind Co Ltd | Brushless motor |
-
1985
- 1985-11-07 JP JP60248052A patent/JPS62108112A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01154413U (en) * | 1988-04-18 | 1989-10-24 | ||
| JPH02146949A (en) * | 1988-11-28 | 1990-06-06 | Matsushita Electric Ind Co Ltd | Brushless motor |
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