JPH0563767B2 - - Google Patents
Info
- Publication number
- JPH0563767B2 JPH0563767B2 JP10307887A JP10307887A JPH0563767B2 JP H0563767 B2 JPH0563767 B2 JP H0563767B2 JP 10307887 A JP10307887 A JP 10307887A JP 10307887 A JP10307887 A JP 10307887A JP H0563767 B2 JPH0563767 B2 JP H0563767B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical
- light emitting
- optical communication
- elements
- 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
- 230000003287 optical effect Effects 0.000 claims description 44
- 239000011358 absorbing material Substances 0.000 claims description 9
- 239000013307 optical fiber Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/3604—Rotary joints allowing relative rotational movement between opposing fibre or fibre bundle ends
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
Description
【発明の詳細な説明】
(イ) 産業上の利用分野
本発明は、回転部と固定部との間で光通信を行
うための回転式ホトカプラに関するものである。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a rotary photocoupler for optical communication between a rotating part and a fixed part.
(ロ) 従来の技術
回転部と固定部との間で光信号を伝達するため
に従来は、たとえば実開昭61−201005号公報に示
されるような回転式ホトカプラが使用されてい
た。これに示される回転式ホトカプラは、回転体
に設置された複数本の光フアイバと、上記回転体
を収容する固定体に設置された複数本の光フアイ
バと、倒立像を正立像に反転させる光学要素（ペ
チヤンプリズム）と、を有しており、光学要素が
回転体の1/2の角速度で同方向に回転するように
構成されている。送信側の光フアイバから放射さ
れた光信号は、送信側の集光レンズ（収束性レン
ズ）によつて集光された後、受信側に送られ、受
信側の集光レンズによつて集光された光信号が受
信側の光フアイバによつて受光されるようになつ
ている。これにより、回転体及び固定体間で光信
号の伝送を行うことができる。(B) Prior Art Conventionally, a rotary photocoupler as shown in, for example, Japanese Utility Model Application Publication No. 61-201005 has been used to transmit optical signals between a rotating part and a fixed part. The rotary photocoupler shown here includes a plurality of optical fibers installed on a rotating body, a plurality of optical fibers installed on a fixed body that accommodates the rotating body, and an optical fiber for reversing an inverted image into an erect image. element (Pechyan prism), and the optical element is configured to rotate in the same direction at 1/2 the angular velocity of the rotating body. The optical signal emitted from the optical fiber on the transmitting side is condensed by a condensing lens (convergent lens) on the transmitting side, then sent to the receiving side, and condensed by the condensing lens on the receiving side. The received optical signal is received by an optical fiber on the receiving side. Thereby, optical signals can be transmitted between the rotating body and the fixed body.
(ハ) 発明が解決しようとする問題点
しかしながら、上記のような従来の回転式ホト
カプラにおいては、送信側及び受信側間に集光レ
ンズを設ける必要があるので、集光レンズの設置
スペースが必要になるとともに光路長が長くなる
ため装置が大形になるという問題点がある。本発
明は、このような問題点を解決することを目的と
している。(c) Problems to be solved by the invention However, in the conventional rotary photocoupler as described above, it is necessary to provide a condensing lens between the transmitting side and the receiving side, so a space for installing the condensing lens is required. There is a problem in that the optical path length becomes longer and the device becomes larger. The present invention aims to solve these problems.
(ニ) 問題点を解決するための手段
本発明は、光通信要素の発光素子として発光ダ
イオードを用いるとともに、光路に光吸収材製の
筒を設けることにより上記問題点を解決する。す
なわち、本発明による回転式ホトカプラは、複数
の光通信要素（発光素子３０ａ、受光素子３２
ｂ）を有する第１部材２８と、第１部材の光通信
要素にそれぞれ対応する複数の光通信要素（受光
素子３２ａ、発光素子３０ｂ）を有する第２部材
３８と、倒立像を正立像に反転させる光学要素
（正立プリズム３４）と、を有し、第１部材及び
第２部材は上記光学要素を介して一方の各光通信
要素が他方の各光通信要素に光学的に連結される
ように配置され、第１部材が回転可能であり、第
２部材が固定され、上記光学要素が第１部材の1/
２の角速度で回転可能とされているものにおいて、
光通信要素の発光素子として発光ダイオード３０
ａが用いられているとともに、これからの光が第
１部材の外に出るまでの間通過する光路に光吸収
材製の筒７２が設けられていることを特徴として
いる。なお、本明細書中で発光ダイオードとは、
レーザダイオードも含むものとする。また、かつ
こ内の符号は後述の実施例の対応する部材を示
す。(d) Means for Solving the Problems The present invention solves the above problems by using a light emitting diode as a light emitting element of an optical communication element and by providing a tube made of a light absorbing material in the optical path. That is, the rotary photocoupler according to the present invention includes a plurality of optical communication elements (a light emitting element 30a, a light receiving element 32
b), a second member 38 having a plurality of optical communication elements (light receiving element 32a, light emitting element 30b) corresponding to the optical communication elements of the first member, and inverting an inverted image to an erect image. an optical element (erecting prism 34), and the first member and the second member are arranged such that each optical communication element on one side is optically coupled to each optical communication element on the other side via the optical element. , the first member is rotatable, the second member is fixed, and the optical element is 1/1/2 of the first member.
In a device that is said to be able to rotate at an angular velocity of 2,
Light emitting diode 30 as a light emitting element of an optical communication element
A is used, and a tube 72 made of a light absorbing material is provided in the optical path through which the light passes until it exits the first member. Note that in this specification, light emitting diode refers to
It also includes laser diodes. Further, the reference numerals in parentheses indicate corresponding members in the embodiments described later.
(ホ) 作用
たとえば第１部材側の光通信要素である発光素
子からの光信号は、像正立用の光学要素を通して
第２部材の対応する光通信要素である受光素子に
送られる。たとえば、第２部材が静止しており、
第１部材が所定方向に回転し、かつ上記光学要素
が第１部材と同一方向に第１部材の1/2の角速度
で回転するとすると、第１部材の発光素子からの
光信号は常に第２部材の対応する受光素子によつ
て受光される。これは、上記光学要素であるたと
えば正立プリズムに対して第１部材が所定方向に
回転すると、正立プリズムを通過した像は第１部
材とは逆方向に回転することになるからであり、
上述のように正立プリズムに対して第１部材が２
倍の角速度で回転すると、正立プリズムを通過し
た像は静止することになる。すなわち、第２部材
上の定められた位置に像を結ぶことになる。第１
部材上に多数の発光素子（又は受光素子あるいは
これらの両方）を設け、これに対応して第２部材
に受光素子（又は発光素子あるいはこれらの両
方）を設けることにより、１つの回転式ホトカプ
ラによつて多数の回路の光信号を伝達することが
可能となる。発光素子として指向性の強い（狭指
向性）発光ダイオードを用いるとともに、これか
らの光が第１部材の外に出るまでの間、光吸収材
を用いた筒内を通過するように構成することによ
り、光の発散を防止できるので発光素子及び受光
素子間に集光レンズを設ける必要がなくなり、光
路長が短くて済むこととあいまつて装置を小形化
することができる。(e) Effect For example, an optical signal from a light emitting element which is an optical communication element on the first member side is sent to a light receiving element which is a corresponding optical communication element of the second member through an optical element for image erecting. For example, the second member is stationary;
If the first member rotates in a predetermined direction and the optical element rotates in the same direction as the first member at an angular velocity of 1/2 of the first member, the optical signal from the light emitting element of the first member will always be transmitted to the second member. The light is received by the corresponding light receiving element of the member. This is because when the first member rotates in a predetermined direction with respect to the optical element, for example, the erecting prism, the image passing through the erecting prism will rotate in the opposite direction to the first member.
As mentioned above, the first member is
If it rotates at twice the angular velocity, the image that passes through the erecting prism will come to rest. In other words, the image is focused on a predetermined position on the second member. 1st
By providing a large number of light-emitting elements (or light-receiving elements, or both) on one member, and correspondingly providing light-receiving elements (or light-emitting elements, or both) on the second member, one rotary photocoupler can be used. Therefore, it becomes possible to transmit optical signals from a large number of circuits. By using a light-emitting diode with strong directivity (narrow directivity) as a light-emitting element, and configuring the light to pass through a cylinder made of a light-absorbing material until it exits the first member. Since the light divergence can be prevented, there is no need to provide a condenser lens between the light emitting element and the light receiving element, and the optical path length can be shortened, making it possible to downsize the device.
(ヘ) 実施例
第１〜８図に本発明の実施例を示す。この回転
式ホトカプラは、固定部１０とこれの上方に設け
られた２つの回転部１２及び１４を有している。
回転部１２及び１４はそれぞれ外周に歯車１６及
び１８を有しており、この歯車１６及び１８は、
回転軸２６に固定された歯車２２及び２４とそれ
ぞれかみ合つている。回転軸２６は、固定部１０
と一体の支持部材２０に回転可能に支持されてい
る。歯車２４と歯車１６との歯数比は、歯車２２
と歯車１８との歯数比の1/2となるようにしてあ
る。すなわち、回転部１２が１回転したとき、回
転部１４は２回転するようにしてある。回転部１
４内には第１部材２８が設けられている。円板状
の第１部材２８の下面側には第４図に示すように
複数の発光素子３０ａ及び複数の受光素子３２ｂ
が所定の間隔で配列されている。回転部１２の内
部には正立プリズム３４が設けられている。正立
プリズム３４は倒立像を正立像に反転させること
が可能なプリズムであり、第７図に示すような形
状の２つの要素３４ａ及び３４ｂから成つてい
る。従つて、たとえば上方から見て光源を時計回
転方向に回転させると、正立プリズム３４を通過
した光源の像は反時計回転方向に回転することに
なる。また、固定部１０の内部下側には第２部材
３８が設けられている。第２部材３８の上面には
第５図に示すように複数の受光素子３２ａ及び複
数の発光素子３０ｂが設けられている。発光素子
３０ａ及び３０ｂとしては、発光ダイオードを用
い、受光素子３２ａ及び３２ｂとしてはホトトラ
ンジスタが使用されている。第１部材２８に設け
る発光素子としては、第８図に示すように、特に
指向性の強い（狭指向性）発光ダイオード３０ａ
が用いられており、これからの光が第１部材２８
の外に出るまでの間光吸収材を用いた筒７２を通
過するようにしてある。これにより、発光ダイオ
ード３０ａからの光はプリズム３４に平行に入射
され光束は広がらない。したがつて、集光用のレ
ンズは不要となり、光路長が短くて済むこととあ
いまつて装置を小形化することができる。第１部
材２８上の発光素子３０ａ及び受光素子３２ｂ
は、第２部材３８上の受光素子３２ａ及び発光素
子３０ｂに対して１対１で対応するように配列し
てある。(f) Examples Examples of the present invention are shown in FIGS. 1 to 8. This rotary photocoupler has a fixed part 10 and two rotating parts 12 and 14 provided above it.
The rotating parts 12 and 14 have gears 16 and 18 on their outer peripheries, respectively, and the gears 16 and 18 are
They mesh with gears 22 and 24 fixed to a rotating shaft 26, respectively. The rotating shaft 26 is connected to the fixed part 10
It is rotatably supported by a support member 20 that is integrated with. The ratio of the number of teeth between the gear 24 and the gear 16 is that of the gear 22.
The ratio of the number of teeth between the gear 18 and the gear 18 is set to 1/2. That is, when the rotating section 12 rotates once, the rotating section 14 rotates twice. Rotating part 1
4, a first member 28 is provided. As shown in FIG. 4, on the lower surface side of the disk-shaped first member 28, a plurality of light emitting elements 30a and a plurality of light receiving elements 32b are provided.
are arranged at predetermined intervals. An erecting prism 34 is provided inside the rotating section 12. The erecting prism 34 is a prism capable of reversing an inverted image into an erect image, and is composed of two elements 34a and 34b shaped as shown in FIG. 7. Therefore, for example, if the light source is rotated clockwise when viewed from above, the image of the light source that has passed through the erecting prism 34 will be rotated counterclockwise. Further, a second member 38 is provided on the lower side inside the fixing part 10. As shown in FIG. 5, a plurality of light receiving elements 32a and a plurality of light emitting elements 30b are provided on the upper surface of the second member 38. Light emitting diodes are used as the light emitting elements 30a and 30b, and phototransistors are used as the light receiving elements 32a and 32b. As the light emitting element provided in the first member 28, as shown in FIG. 8, a light emitting diode 30a with particularly strong directivity (narrow directivity)
is used, and the light from this is directed to the first member 28.
The light passes through a tube 72 made of a light absorbing material until it exits. Thereby, the light from the light emitting diode 30a enters the prism 34 in parallel, and the luminous flux does not spread. Therefore, a condensing lens is not required, and the optical path length can be shortened, and the device can be downsized. Light emitting element 30a and light receiving element 32b on first member 28
are arranged in one-to-one correspondence with the light receiving element 32a and the light emitting element 30b on the second member 38.
次にこの実施例の作用について説明する。第１
部材２８上の所定の発光素子３０ａは、第６図に
示すように、正立プリズム３４を通つて第２部材
３８上の受光素子３２ａ上に結像する。この状態
で回転軸２６を回転させると、回転部１４及び回
転部１２が回転する。ただし、歯車２４と歯車１
６との歯数比と、歯車２２と歯車１８との歯数比
との関係から、回転部１２は回転部１４の角速度
の1/2の角速度で回転する。第１部材２８が回転
することによりこの上の発光素子３０ａも同様の
角速度で回転することになる。しかし、正立プリ
ズム３４が第１部材２８の1/2の角速度で回転し
ているため、発光素子３０ａの像は静止している
第２部材３８の前述の所定の受光素子３２ａ上に
静止したままとなる。 Next, the operation of this embodiment will be explained. 1st
A predetermined light emitting element 30a on the member 28 forms an image on the light receiving element 32a on the second member 38 through the erecting prism 34, as shown in FIG. When the rotating shaft 26 is rotated in this state, the rotating portion 14 and the rotating portion 12 are rotated. However, gear 24 and gear 1
6 and the ratio of teeth between the gear 22 and the gear 18, the rotating section 12 rotates at an angular velocity that is half the angular velocity of the rotating section 14. As the first member 28 rotates, the light emitting element 30a thereon also rotates at the same angular velocity. However, since the erecting prism 34 is rotating at 1/2 the angular velocity of the first member 28, the image of the light emitting element 30a remains on the above-mentioned predetermined light receiving element 32a of the stationary second member 38. It will remain as it is.
なお、上述の実施例の説明では発光素子３０ａ
及び３０ｂとして発光ダイオードを用い、受光素
子３２ａ及び３２ｂとしてホトトランジスタを用
いるものとしたが、発光素子はレーザダイオード
でもよく、また受光素子はホトダイオード又はホ
トICでもよい。 Note that in the description of the above embodiment, the light emitting element 30a
Although light emitting diodes are used as the and 30b, and phototransistors are used as the light receiving elements 32a and 32b, the light emitting elements may be laser diodes, and the light receiving elements may be photodiodes or photo ICs.
また、上述の実施例では、第１部材２８の発光
素子３０ａの光路に光吸収材製の筒７２を用いた
が、第２部材３８の発光素子３０ｂの光路に同様
な光吸収材製の筒を設けることもできる。 Further, in the above embodiment, the tube 72 made of a light absorbing material was used in the optical path of the light emitting element 30a of the first member 28, but a similar tube made of a light absorbing material was used in the optical path of the light emitting element 30b of the second member 38. It is also possible to provide
さらに、上述の実施例では、回転部１２及び１
４を所定の関係で回転駆動する装置として歯車装
置を用いたが、これらは回転部１４に対して回転
部１２を1/2の角速度で回転する構造であれば、
タイミングベルトなどその他のどのような装置で
あつても差し支えない。 Furthermore, in the embodiment described above, the rotating parts 12 and 1
A gear device was used as a device for rotationally driving 4 in a predetermined relationship, but if these have a structure that rotates the rotating part 12 at an angular velocity of 1/2 with respect to the rotating part 14,
Any other device, such as a timing belt, may also be used.
なお、上述の実施例では、第２部材３８を停止
させ、第１部材２８を回転させ、かつプリズム３
４を第１部材２８の1/2の角速度て回転させるよ
うにしたが、プリズム３４を静止させ、第１部材
２８と第２部材３８とを互いに逆方向に同一角速
度で回転させても同様の作用を得ることができ
る。また、上述の回転とは別に、第１部材２８、
第２部材３８及びプリズム３４のいずれか１つを
所定角度だけ回転変位させたことにより、光通信
要素の対応関係を変えることができる。たとえ
ば、プリズム３４を第１部材２８及び第２部材３
８の発光素子３０及び受光素子３２の回転方向配
置ピツチだけ又はこのピツチの倍数だけ回転させ
ると、第１部材２８上の発光素子３０と第２部材
３８上の受光素子３２との組合わせを変えること
ができる。また、像正立用の光学要素としては、
上述の正立プリズム３４とは異なる形式の正立プ
リズムを用いることもできる。 Note that in the above embodiment, the second member 38 is stopped, the first member 28 is rotated, and the prism 3
4 is rotated at 1/2 the angular velocity of the first member 28, but the same result can be obtained even if the prism 34 is kept stationary and the first member 28 and the second member 38 are rotated at the same angular velocity in opposite directions. effect can be obtained. In addition to the above-mentioned rotation, the first member 28,
By rotationally displacing either the second member 38 or the prism 34 by a predetermined angle, the correspondence of the optical communication elements can be changed. For example, the prism 34 is connected to the first member 28 and the second member 3.
By rotating the light emitting element 30 and the light receiving element 32 on the first member 28 by the rotational direction arrangement pitch of the light emitting element 30 and the light receiving element 32 shown in FIG. be able to. In addition, as an optical element for image erecting,
It is also possible to use a different type of erecting prism than the erecting prism 34 described above.
(ト) 発明の効果
以上説明してきたように、本発明によると、集
光レンズを必要としないので、従来よりも回転式
ホトカツプラを小形化することができる。(G) Effects of the Invention As explained above, according to the present invention, since a condensing lens is not required, the rotary photocoupler can be made smaller than the conventional one.
第１図は本発明の実施例を示す図、第２図は第
１図の側面図、第３図は第１図の平面図、第４図
は第１図の矢印方向に見た図、第５図は第１図
の矢印方向に見た図、第６図は結像光路を示す
図、第７図は正立プリズムを拡大して示す図、第
８図は光吸収材製の筒の配置を説明する図であ
る。
１６，１８，２２，２４…歯車、２８…第１部
材、３０ａ，３０ｂ…発光ダイオード（発光素
子）、３２ａ，３２ｂ…ホトトランジスタ（受光
素子）、３４…プリズム、３８…第２部材、７２
…光吸収材製の筒。
1 is a diagram showing an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a plan view of FIG. 1, and FIG. 4 is a view seen in the direction of the arrow in FIG. Figure 5 is a view seen in the direction of the arrow in Figure 1, Figure 6 is a view showing the imaging optical path, Figure 7 is an enlarged view of the erecting prism, and Figure 8 is a tube made of light absorbing material. It is a figure explaining arrangement of. 16, 18, 22, 24... Gear, 28... First member, 30a, 30b... Light emitting diode (light emitting element), 32a, 32b... Phototransistor (light receiving element), 34... Prism, 38... Second member, 72
...A tube made of light-absorbing material.
Claims (1)
１部材２８と、第１部材の光通信要素にそれぞれ
対応する複数の光通信要素３２ａ，３０ｂを有す
る第２部材３８と、倒立像を正立像に反転させる
光学要素３４と、を有し、第１部材及び第２部材
は上記光学要素を介して一方の各光通信要素が他
方の各光通信要素に光学的に連結されるように配
置され、第１部材が回転可能であり、第２部材が
固定され、上記光学要素が第１部材の1/2の角速
度で回転可能とされている回転式ホトカプラにお
いて、光通信要素の発光素子として発光ダイオー
ド３０ａが用いられるとともに、これからの光が
第１部材の外に出るまでの間通過する光路に光吸
収材製の筒７２が設けられていることを特徴とす
る回転式ホトカプラ。1. A first member 28 having a plurality of optical communication elements 30a, 32b, a second member 38 having a plurality of optical communication elements 32a, 30b corresponding to the optical communication elements of the first member, and converting an inverted image into an erect image. an inverting optical element 34, the first member and the second member are arranged such that each optical communication element on one side is optically coupled to each optical communication element on the other side via the optical element; In a rotary photocoupler in which the first member is rotatable, the second member is fixed, and the optical element is rotatable at an angular velocity half that of the first member, a light emitting diode is used as a light emitting element of the optical communication element. 30a, and a tube 72 made of a light absorbing material is provided in the optical path through which the light passes until it exits the first member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62103078A JPS63269108A (en) | 1987-04-28 | 1987-04-28 | Rotary photocoupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62103078A JPS63269108A (en) | 1987-04-28 | 1987-04-28 | Rotary photocoupler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63269108A JPS63269108A (en) | 1988-11-07 |
| JPH0563767B2 true JPH0563767B2 (en) | 1993-09-13 |
Family
ID=14344603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62103078A Granted JPS63269108A (en) | 1987-04-28 | 1987-04-28 | Rotary photocoupler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63269108A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59105608A (en) * | 1912-08-01 | 1984-06-19 | スペリ−・コ−ポレイシヨン | Rotary joiner for optical fiber |
| JPS60218609A (en) * | 1984-03-26 | 1985-11-01 | シユライフリンク ウント アパラテバウ ゲーエムベーハー | Light signal transmitter between two members |
| JPS6124961U (en) * | 1984-07-19 | 1986-02-14 | 日本電池株式会社 | Hydrant for storage battery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH043281Y2 (en) * | 1985-06-04 | 1992-02-03 |
-
1987
- 1987-04-28 JP JP62103078A patent/JPS63269108A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59105608A (en) * | 1912-08-01 | 1984-06-19 | スペリ−・コ−ポレイシヨン | Rotary joiner for optical fiber |
| JPS60218609A (en) * | 1984-03-26 | 1985-11-01 | シユライフリンク ウント アパラテバウ ゲーエムベーハー | Light signal transmitter between two members |
| JPS6124961U (en) * | 1984-07-19 | 1986-02-14 | 日本電池株式会社 | Hydrant for storage battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63269108A (en) | 1988-11-07 |
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