JP3076643B2 - Photoelectric sensor fiber unit - Google Patents
Photoelectric sensor fiber unitInfo
- Publication number
- JP3076643B2 JP3076643B2 JP03306321A JP30632191A JP3076643B2 JP 3076643 B2 JP3076643 B2 JP 3076643B2 JP 03306321 A JP03306321 A JP 03306321A JP 30632191 A JP30632191 A JP 30632191A JP 3076643 B2 JP3076643 B2 JP 3076643B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- core optical
- core
- fiber
- resin
- 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.)
- Expired - Lifetime
Links
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- Length Measuring Devices By Optical Means (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、物体の有無や大きさ等
を検出する光ファイバ式光電センサを構成するファイバ
ユニットに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber unit constituting an optical fiber type photoelectric sensor for detecting the presence / absence and size of an object.
【０００２】[0002]
【従来の技術】従来、光ファイバ式光電センサを構成す
るファイバユニットに使用する光ファイバとして、通常
大口径にしても可撓性のある、同心円状の芯鞘構造の単
芯のプラスチック光ファイバを、投光用、受光用として
それぞれ１本ずつ使用することが多い。2. Description of the Related Art Conventionally, as an optical fiber used for a fiber unit constituting an optical fiber type photoelectric sensor, a single-core plastic optical fiber having a concentric core-sheath structure which is flexible even if it is usually large in diameter. , One for light projection and one for light reception.
【０００３】[0003]
【発明が解決しようとする課題】ところが、投光用ファ
イバ、受光用ファイバに単芯光ファイバを使用する場合
で、物体の有無を単に検出する際は、有無の判定の敷居
値とに余裕が充分あれば問題にならないが、検出限界す
れすれの場合、微妙に判定が振れてしまい、誤動作をお
こす問題があった。更に、このことは、物体の有無の単
なる検出ではなく、大きさや曇りの程度などをアナログ
的に検出するときに微妙な数値変動となって問題であっ
た。原因を究明してみると、１本の光ファイバから出射
される光のパターンを観察すると、光軸ずれや入射角等
の光源からの入射条件により、出射する光の輪がドーナ
ツ状となって、しかもドーナツの径が微妙に変動するこ
とが判った。即ち不規則に光の強度が変わり、敷居値付
近で思いもよらない動きを示していたのである。However, when a single-core optical fiber is used as the light-emitting fiber and the light-receiving fiber, when simply detecting the presence or absence of an object, there is a margin with the threshold value for determining the presence or absence of an object. This is not a problem if it is sufficient. However, in the case where the detection limit is just approached, the determination slightly fluctuates, and there is a problem that a malfunction occurs. Furthermore, this is not a simple detection of the presence / absence of an object, but is a problem in that minute numerical fluctuations occur when the size, the degree of fogging, and the like are detected in an analog manner. When investigating the cause, when observing the pattern of light emitted from one optical fiber, the ring of emitted light becomes donut-shaped due to the incident conditions from the light source such as optical axis deviation and incident angle. In addition, it was found that the diameter of the donut slightly changed. That is, the light intensity changed irregularly, indicating unexpected movement near the threshold value.
【０００４】[0004]
【課題を解決するための手段】本発明者は鋭意検討の結
果、単芯ファイバの先端部に以下のような多数の小さな
芯で分割された多芯光ファイバを、先端部にわずかの長
さだけ結合することにより、出射パターンを規則的に整
形できる本発明に至った。即ち本発明は、光ファイバ式
光電センサのファイバユニットにおいて、アンプユニッ
ト側が単芯光ファイバであり、検出端側が屈折率の高い
透明な芯樹脂からなる７個以上の芯樹脂の島とそれを取
り囲む屈折率の低い鞘樹脂を海とする海島構造体、ある
いは芯樹脂とそれを取り囲む屈折率の低い鞘樹脂を同心
円構造の島とし、その周りを第３の樹脂で充填した海島
構造体として一纏めにした、断面が円状の長さ１ｍｍ以
上の多芯光ファイバであり、該単芯光ファイバと該多芯
光ファイバが結合されていることを特徴とするファイバ
ユニットである。As a result of diligent studies, the present inventor has found that a multi-core optical fiber divided by a number of small cores at the tip of a single-core fiber has a small length at the tip as follows. By combining only these, the present invention has been achieved in which the emission pattern can be regularly shaped. That is, in the fiber unit of the optical fiber type photoelectric sensor, the amplifier unit side is a single-core optical fiber, and the detection end side surrounds seven or more core resin islands made of a transparent core resin having a high refractive index. A sea-island structure in which a sheath resin with a low refractive index is the sea, or a core resin and a sheath resin with a low refractive index surrounding the core resin are concentric islands, and the sea-island structure in which the periphery is filled with a third resin is collectively put together. The fiber unit is a multi-core optical fiber having a circular cross section of 1 mm or more in length, wherein the single-core optical fiber and the multi-core optical fiber are coupled.
【０００５】選択的に、該多芯光ファイバの個々の島の
直径が５μｍ乃至５０μｍであり、島の個数が５００個
以上であることを特徴とする前述の請求項１のファイバ
ユニット、又は該多芯光ファイバの長さが５ｍｍ以上で
あることを特徴とする前述のファイバユニット、又は該
単芯光ファイバと該多芯光ファイバがそれぞれ分離可能
な独立した部品として構成されていることを特徴とする
前述のファイバユニットである。Optionally, the fiber unit according to claim 1, wherein the diameter of each island of the multi-core optical fiber is 5 μm to 50 μm and the number of islands is 500 or more. The above-described fiber unit, wherein the length of the multi-core optical fiber is 5 mm or more, or the single-core optical fiber and the multi-core optical fiber are configured as separable independent components. The fiber unit described above.
【０００６】単芯光ファイバの材質に特に限定はない
が、芯がポリメチルメタクリレート、ポリスチレン、ポ
リカーボネートなどの材質からなるプラスチック光ファ
イバがよく使用される。大口径のガラスファイバが使用
されることもある。多芯光ファイバの材質に特に限定は
ないが、芯はポリメチルメタクリレート、ポリスチレ
ン、ポリカーボネートなどの材質からなり海部がそれよ
り低い屈折率からなる樹脂のプラスチック光ファイバが
よく使用される。The material of the single-core optical fiber is not particularly limited, but a plastic optical fiber whose core is made of a material such as polymethyl methacrylate, polystyrene, or polycarbonate is often used. Large diameter glass fibers may be used. Although the material of the multi-core optical fiber is not particularly limited, a plastic optical fiber of a resin whose core is made of a material such as polymethyl methacrylate, polystyrene, or polycarbonate and whose sea portion has a lower refractive index is often used.
【０００７】被覆材としては特に限定はないがポリエチ
レン、ＰＶＣ、ウレタン、フッ素樹脂などの熱可塑性樹
脂あるいは各種ゴムチューブなどがよく使用される。単
芯光ファイバの径は特に限定はないが、０．２５ｍｍ
φ、０．５ｍｍφ、０．７５ｍｍφ、１．０ｍｍφなど
のファイバがよく使用される。多芯光ファイバの径は特
に限定しないが、結合損失を小さくするため該単芯光フ
ァイバに比べて、投光側の場合には、等しいかやや大き
めに設定し、逆に受光側の場合には、等しいかやや小さ
めに設定するのがよい。The coating material is not particularly limited, but a thermoplastic resin such as polyethylene, PVC, urethane, or fluororesin, or various rubber tubes is often used. Although the diameter of the single core optical fiber is not particularly limited, it is 0.25 mm.
Fibers such as φ, 0.5 mmφ, 0.75 mmφ, and 1.0 mmφ are often used. The diameter of the multi-core optical fiber is not particularly limited, but is set to be equal or slightly larger on the light emitting side than on the single-core optical fiber to reduce the coupling loss, and conversely on the light receiving side. Should be set equal or slightly smaller.
【０００８】単芯光ファイバと多芯光ファイバとの結合
部は、単芯光ファイバと多芯光ファイバを直接マッチン
グオイルを介して接続してもよいし、透明な接着剤で接
続してもよい。あるいは機械的に接触させてもよい。好
ましくは、結合に適した部品を用いるのがよい。該結合
部の材質、形状は特に限定しないが真鍮、ステンレス、
アルミニウムなどの金属、ＰＢＴ、ナイロンなどの耐熱
性プラスチック等が使用でき、光ファイバ先端部とネジ
止め、または差し込みロックなどで固定できるように
し、形状は円形、四角形、六角形など適切なものを選ぶ
ことができる。多芯光ファイバの先端部はストレートタ
イプでもよいし、適切な曲げ曲率で９０度等、所定の角
度に曲げてサイドビュータイプにしてもよい。The single-core optical fiber and the multi-core optical fiber may be connected to each other by directly connecting the single-core optical fiber and the multi-core optical fiber via a matching oil or by using a transparent adhesive. Good. Or you may make it contact mechanically. Preferably, parts suitable for coupling are used. The material and shape of the connecting portion are not particularly limited, but brass, stainless steel,
Metal such as aluminum, heat-resistant plastic such as PBT, nylon, etc. can be used, and it can be fixed to the optical fiber tip with screws or insertion locks. be able to. The tip of the multi-core optical fiber may be a straight type, or may be bent to a predetermined angle such as 90 degrees with an appropriate bending curvature to be a side view type.
【０００９】該多芯光ファイバコードの長さは１ｍｍ以
上が必要である。１ｍｍより短いと本発明の整形効果が
充分発揮できない。好ましくは５ｍｍ以上である。長さ
の上限に特に制限はないが、操作性を考えると通常は２
００ｍｍ以下の長さで使用することが多い。The length of the multi-core optical fiber cord must be 1 mm or more. If it is shorter than 1 mm, the shaping effect of the present invention cannot be sufficiently exhibited. It is preferably at least 5 mm. The upper limit of the length is not particularly limited, but is usually 2 in consideration of operability.
It is often used with a length of 00 mm or less.
【００１０】[0010]
【実施例】以下実施例を用いて更に詳細に説明する。The present invention will be described in more detail with reference to the following examples.
【００１１】[0011]
【実施例１】単芯光ファイバとして芯をＰＭＭＡ、鞘を
フッ素樹脂とする直径１ｍｍのプラスチック光ファイバ
を使用した長さ２ｍの透過型ファイバユニットを使用し
た。多芯光ファイバは芯をＰＭＭＡ、鞘をフッ素樹脂と
する、芯の数が１０００個の直径１ｍｍの多芯光ファイ
バで長さ５０ｍｍのものを使用した。光ファイバの被覆
材はいずれもＰＥである。EXAMPLE 1 A transmission fiber unit having a length of 2 m and using a plastic optical fiber having a diameter of 1 mm and having a core of PMMA and a sheath of a fluororesin was used as a single-core optical fiber. As the multi-core optical fiber, a multi-core optical fiber having a core of PMMA and a sheath made of a fluororesin and having a core number of 1000 and having a diameter of 1 mm and a length of 50 mm was used. The coating material of the optical fiber is PE.
【００１２】結合は、単芯光ファイバの結合端部に雄ネ
ジが付いた金具、多芯光ファイバの結合端部に雌ネジが
付いた金具を使用することにより行った。アンプユニッ
トにオムロン製Ｅ３ＸＲ−ＣＥ４Ｔ（電源電圧１２Ｖ）
を使用した。試験方法を図４に示す。本発明ファイバユ
ニット先端部からの出射光量の分布は図５の通りであっ
た。The coupling was performed by using a metal fitting having a male thread at the coupling end of the single-core optical fiber and a metal fitting having a female thread at the coupling end of the multi-core optical fiber. OMRON E3XR-CE4T (power supply voltage 12V) for the amplifier unit
It was used. The test method is shown in FIG. The distribution of the amount of light emitted from the fiber unit tip of the present invention was as shown in FIG.
【００１３】このように本発明のファイバユニットから
出射された出射光の光強度分布は光軸延長上の点をピー
クとした左右対称な単純な光強度分布を示している。As described above, the light intensity distribution of the outgoing light emitted from the fiber unit of the present invention shows a simple light intensity distribution that is bilaterally symmetric with a peak on the optical axis extension.
【００１４】[0014]
【実施例２】単芯光ファイバ、多芯光ファイバ、両者の
結合部、アンプユニットは実施例１と同じものを使用
し、多芯光ファイバの長さが１０ｍｍと５ｍｍのものを
使用した。本発明ファイバユニットからの出射光量の分
布は図６、および図７の通りであった。Embodiment 2 The single-core optical fiber, the multi-core optical fiber, the coupling portion between them, and the amplifier unit were the same as those in the first embodiment, and the multi-core optical fibers having lengths of 10 mm and 5 mm were used. The distribution of the amount of light emitted from the fiber unit of the present invention was as shown in FIGS.
【００１５】このように本発明のファイバユニットから
出射された出射光の光強度分布は光軸延長上の点をピー
クとした左右対称な単純な光強度分布を示している。As described above, the light intensity distribution of the light emitted from the fiber unit of the present invention shows a simple light intensity distribution that is symmetrical with a peak at a point on the optical axis extension.
【００１６】[0016]
【実施例３】単芯光ファイバとして芯をＰＭＭＡ、鞘を
フッ素樹脂とする直径０．５ｍｍのプラスチック光ファ
イバを使用した長さ２ｍの透過型ファイバユニットを使
用した。多芯光ファイバは芯をＰＭＭＡ、鞘をフッ素樹
脂とする、芯の数が３５００個の直径０．５ｍｍの多芯
光ファイバで長さ５０ｍｍのものを使用した。Example 3 A transmission fiber unit having a length of 2 m and a plastic optical fiber having a core of PMMA and a sheath made of fluororesin and having a diameter of 0.5 mm was used as a single-core optical fiber. As the multi-core optical fiber, a multi-core optical fiber having a core of PMMA and a sheath made of fluororesin and having a number of cores of 3500 and a diameter of 0.5 mm and a length of 50 mm was used.
【００１７】結合は、単芯光ファイバの結合端部をコネ
クタのレセプタクルにし、多芯光ファイバの結合端部を
コネクタのフェルールの形状にして差し込むことにより
行った。アンプユニットは実施例１と同じものを使用し
た。本発明ファイバユニット先端部からの出射光量の分
布は図８の通りであった。The coupling was performed by inserting the coupling end of the single-core optical fiber into the receptacle of the connector and inserting the coupling end of the multi-core optical fiber into the shape of a ferrule of the connector. The same amplifier unit as in Example 1 was used. The distribution of the amount of light emitted from the fiber unit tip of the present invention was as shown in FIG.
【００１８】このように本発明のファイバユニットから
出射された出射光の光強度分布は光軸延長上の点をピー
クとした左右対称な単純な光強度分布を示している。As described above, the light intensity distribution of the light emitted from the fiber unit of the present invention shows a simple light intensity distribution that is symmetrical with a peak at a point on the optical axis extension.
【００１９】[0019]
【００２０】[0020]
【００２１】[0021]
【比較例１】実施例１から多芯光ファイバを取り外した
もの、即ち単芯の直径１ｍｍの光ファイバから直接光を
出射した。その他は実施例１と同様である。比較例の出
射光量の分布は図９の通りであった。このように単芯光
ファイバから直接出射された出射光の光強度分布は複雑
な形状を示している。Comparative Example 1 Light was directly emitted from Example 1 except that the multi-core optical fiber was removed, that is, a single-core optical fiber having a diameter of 1 mm. Others are the same as the first embodiment. FIG. 9 shows the distribution of the emitted light amount in the comparative example. As described above, the light intensity distribution of light emitted directly from the single-core optical fiber has a complicated shape.
【００２２】[0022]
【発明の効果】このように、単芯光ファイバの先端部に
多数の小さな芯で分割された多芯光ファイバを結合して
用いることにより、出射パターンを規則的なパターンに
整形できる。その結果安定した検出感度が得られるこ
と、あるいはアナログデータが精度良く得られることが
期待される。As described above, by using a multi-core optical fiber divided by a large number of small cores at the tip of a single-core optical fiber and using it, the emission pattern can be shaped into a regular pattern. As a result, it is expected that stable detection sensitivity is obtained or analog data is obtained with high accuracy.
【図１】本発明のファイバユニットの一例。FIG. 1 is an example of a fiber unit of the present invention.
【図２】単芯光ファイバの断面図。FIG. 2 is a cross-sectional view of a single-core optical fiber.
【図３】多芯光ファイバの断面図。海島構造 Ａ 海
島２層構造の例 Ｂ 海島３層構造の例FIG. 3 is a cross-sectional view of a multi-core optical fiber. Sea-island structure A Example of sea-island two-layer structure B Example of sea-island three-layer structure
【図４】出射光の光強度分布の測定系の概略図。FIG. 4 is a schematic diagram of a measurement system of a light intensity distribution of emitted light.
【図５】実施例１の出射光量の光強度分布。FIG. 5 is a light intensity distribution of an emitted light amount according to the first embodiment.
【図６】実施例２の出射光量の光強度分布（多芯光ファ
イバの長さが１０ｍｍ）。FIG. 6 shows the light intensity distribution of the emitted light amount in Example 2 (the length of the multi-core optical fiber is 10 mm).
【図７】実施例２の出射光量の光強度分布（多芯光ファ
イバの長さが５ｍｍ）。FIG. 7 shows the light intensity distribution of the emitted light amount in Example 2 (the length of the multi-core optical fiber is 5 mm).
【図８】実施例１の出射光量の光強度分布。FIG. 8 is a light intensity distribution of an emitted light amount according to the first embodiment.
【図９】比較例１での出射光量の光強度分布。FIG. 9 is a light intensity distribution of an emitted light amount in Comparative Example 1.
１ 単芯光ファイバ ２ 単芯光ファイバ結合端固定具 ３ 多芯光ファイバ ４ 多芯光ファイバ結合端固定具 ５ ファイバユニット ６ アンプユニット ７ コネクタ ８ コア ９ クラッド １０ 島 コア １１ 海 クラッド １２ クラッド（１０の鞘であり、１０と１２で島とな
る） １３ 海 第3の樹脂 １４ 光源 １５ ディテクタDESCRIPTION OF SYMBOLS 1 Single-core optical fiber 2 Single-core optical fiber coupling end fixture 3 Multi-core optical fiber 4 Multi-core optical fiber coupling end fixture 5 Fiber unit 6 Amplifier unit 7 Connector 8 Core 9 Cladding 10 Island core 11 Sea cladding 12 Cladding (10 13 Sea 3rd resin 14 Light source 15 Detector
Claims (4)
ットにおいて、アンプユニット側が単芯光ファイバであ
り、検出端側が屈折率の高い透明な芯樹脂からなる７個
以上の芯樹脂の島とそれを取り囲む屈折率の低い鞘樹脂
を海とする海島構造体、あるいは芯樹脂とそれを取り囲
む屈折率の低い鞘樹脂を同心円構造の島とし、その周り
を第３の樹脂で充填した海島構造体として一纏めにし
た、断面が円状の長さ１ｍｍ以上の多芯光ファイバであ
り、該単芯光ファイバと該多芯光ファイバが結合されて
いることを特徴とするファイバユニット。In a fiber unit of an optical fiber type photoelectric sensor, an amplifier unit side is a single core optical fiber, and a detection end side includes seven or more core resin islands made of a transparent core resin having a high refractive index and surrounds the islands. A sea-island structure in which a sheath resin with a low refractive index is the sea, or a core resin and a sheath resin with a low refractive index surrounding the core resin are concentric islands, and the sea-island structure in which the periphery is filled with a third resin is collectively put together. A fiber unit comprising a multi-core optical fiber having a circular cross section of 1 mm or more in length, wherein the single-core optical fiber and the multi-core optical fiber are coupled.
μｍ乃至５０μｍであり、島の個数が５００個以上であ
ることを特徴とする請求項１のファイバユニット。2. The multi-core optical fiber according to claim 1, wherein each island has a diameter of 5
2. The fiber unit according to claim 1, wherein the number of the islands is from 500 μm to 50 μm, and the number of islands is 500 or more.
あることを特徴とする請求項１または請求項２のファイ
バユニット。3. The fiber unit according to claim 1, wherein the length of said multi-core optical fiber is 5 mm or more.
それぞれ分離可能な独立した部品として構成されている
ことを特徴とする請求項１、請求項２、または請求項３
のファイバユニット。4. The single-core optical fiber and the multi-core optical fiber are each configured as a separable and independent component.
Fiber unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03306321A JP3076643B2 (en) | 1991-11-21 | 1991-11-21 | Photoelectric sensor fiber unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03306321A JP3076643B2 (en) | 1991-11-21 | 1991-11-21 | Photoelectric sensor fiber unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05141923A JPH05141923A (en) | 1993-06-08 |
| JP3076643B2 true JP3076643B2 (en) | 2000-08-14 |
Family
ID=17955706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03306321A Expired - Lifetime JP3076643B2 (en) | 1991-11-21 | 1991-11-21 | Photoelectric sensor fiber unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3076643B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007178884A (en) * | 2005-12-28 | 2007-07-12 | Sunx Ltd | Optical fiber sensor head and optical fiber sensor |
| DE102006048316A1 (en) * | 2006-10-12 | 2008-04-17 | Robert Bosch Gmbh | Optical fiber probe for interferometric measuring instrument, has reflection zone arranged in fiber for partial reflection of light rays guided in fiber, where reflection zone is arranged in fiber end piece |
| JP2008216506A (en) * | 2007-03-01 | 2008-09-18 | National Institute Of Advanced Industrial & Technology | Light source unit |
| JP2013210562A (en) * | 2012-03-30 | 2013-10-10 | Azbil Corp | Optical fiber device |
-
1991
- 1991-11-21 JP JP03306321A patent/JP3076643B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05141923A (en) | 1993-06-08 |
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