JPH04195106A - Multifiber optical rotary joint - Google Patents
Multifiber optical rotary jointInfo
- Publication number
- JPH04195106A JPH04195106A JP32824390A JP32824390A JPH04195106A JP H04195106 A JPH04195106 A JP H04195106A JP 32824390 A JP32824390 A JP 32824390A JP 32824390 A JP32824390 A JP 32824390A JP H04195106 A JPH04195106 A JP H04195106A
- Authority
- JP
- Japan
- Prior art keywords
- lenses
- cylindrical
- light beam
- optical
- collimator
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 41
- 239000013307 optical fiber Substances 0.000 abstract description 13
- 230000003068 static effect Effects 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 230000004907 flux Effects 0.000 description 16
- 230000007246 mechanism Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は多心光ロータリージヨイントに関し、特に回転
体と静止体の光通信に用いる多心光ロータリージヨイン
トに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-core optical rotary joint, and more particularly to a multi-core optical rotary joint used for optical communication between a rotating body and a stationary body.
回転体と静止体の間で光通信を行う際には、回転体側か
ら入力された像が静止体側で静止する必要があり、その
ために回転側光伝送系と静止側光伝送系の間に多心光ロ
ータリージヨイントを設けている。When performing optical communication between a rotating body and a stationary body, it is necessary for the image input from the rotating body to remain stationary on the stationary body. A Shinkou rotary joint is provided.
従来は多心光ロータリージヨイントとして、第５図に示
すような装置が用いられている。第５図に示す装置では
、光ファイバｌａ、ｌｂにそれぞれ接続され、回転部２
に固定された回転側光コリメータ３ａ、３ｂから、静止
部４に固定された静止側光コリメータ５ａ、５ｂへ像を
伝達する光学系として、ダブプリズム５１が配されてい
る。ダブプリズム５１の底面５２は全反射ミラーとじて
作用する。ダブプリズム５１は中間部５３に取り付ｉｔ
られ、バーニア機構５４により回転部２の回転速度の１
／２の速度で回転される。バーニア機構５４は、中間部
５３に回転可能に取り付けられた転輪５５が静止部４の
円筒部４ａの内面と回転部２の外周の間で回転すること
により、中間部５３を回転させるものである。５６およ
び５７は軸受を示す。第１図で６ａ、６ｂは静止（出力
）側光ファイバを、７ａ、７ｂは光束を、５８ａ。Conventionally, a device as shown in FIG. 5 has been used as a multi-core optical rotary joint. In the apparatus shown in FIG. 5, each of the optical fibers la and lb are connected to
A Dove prism 51 is disposed as an optical system for transmitting an image from the rotating side optical collimators 3a, 3b fixed to the stationary side optical collimators 5a, 5b fixed to the stationary part 4. The bottom surface 52 of the Dove prism 51 acts as a total reflection mirror. The Dove prism 51 is attached to the intermediate part 53.
The vernier mechanism 54 reduces the rotational speed of the rotating section 2 to 1
It rotates at a speed of /2. The vernier mechanism 54 rotates the intermediate portion 53 by rotating a roller 55 rotatably attached to the intermediate portion 53 between the inner surface of the cylindrical portion 4a of the stationary portion 4 and the outer periphery of the rotating portion 2. be. 56 and 57 indicate bearings. In FIG. 1, 6a and 6b are stationary (output) side optical fibers, 7a and 7b are light beams, and 58a.
５８ｂは光ファイバ（ｌａ、ｌｂ）と回転側光コリメー
タ（３ａ、３ｂ）との接続部を、５９ａ。58b is a connecting portion between the optical fiber (la, lb) and the rotation side optical collimator (3a, 3b);
５９ｂは静止側光コリメータ（５ａ、 ５ ｂ）と静
止側光ファイバ（６ａ、 ６ ｂ）との接続部を、そ
れぞれ示す。Reference numeral 59b indicates a connecting portion between the stationary side optical collimator (5a, 5b) and the stationary side optical fiber (6a, 6b), respectively.
このような構成により、回転側光コリメータ３ａ、３ｂ
から入力された像は反転されて静止側光コリメータ５ａ
、５ｂに達し、回転側光コリメータ３ａ、３ｂから入射
する光束７ａ、７ｂが回転していても、静止側光コリメ
ータ５ａ、５ｂに入射する光束は回転しない。With such a configuration, the rotation side optical collimators 3a, 3b
The image input from the stationary side optical collimator 5a is inverted and
, 5b, and even if the light beams 7a, 7b incident from the rotating side optical collimators 3a, 3b rotate, the light beams incident on the stationary side optical collimators 5a, 5b do not rotate.
しかし、従来用いられている上記装置では、伝送路に用
いる光ファイバの本数が多くなると、個別の光コリメー
タの数、従ってそれが集合した光コリメータ全体の直径
か大となるのて、それにつれてダブプリズムの直径も大
となる。ダブプリズムの長さは、使用波長に依存して直
径との関係が決まるため、直径の増大とともに大となり
、その結果回転体側光コリメータと静止側コリメータの
間の距離が大きくなるから、この間での光損失か増加す
る。装置全体も大型となる。However, in the above-mentioned conventional devices, as the number of optical fibers used in the transmission path increases, the number of individual optical collimators, and therefore the diameter of the entire optical collimator assembled with them, increases. The diameter of the prism also becomes larger. The relationship between the length of the Dove prism and the diameter depends on the wavelength used, so it increases as the diameter increases.As a result, the distance between the rotating body side optical collimator and the stationary side collimator increases, so Light loss increases. The entire device also becomes large.
それ故、本発明の目的は、伝送路として用いる光ファイ
バの本数が多くても、回転体側光コリメータと静止側コ
リメータの間での光損失を増加させることなく、また装
置を大型にせずに、回転体側から静止体側へ静止像を伝
達する多心光ロータリージヨイントを実現することであ
る。Therefore, an object of the present invention is to avoid increasing the optical loss between the rotating body side optical collimator and the stationary side collimator, and without increasing the size of the device, even when a large number of optical fibers are used as a transmission path. The objective is to realize a multi-center optical rotary joint that transmits a static image from the rotating body side to the stationary body side.
本発明では、伝送路として用いる光ファイバの本数が多
くても、回転体側光コリメータと静止側コリメータの間
での光損失を増加させることなく、回転体側から静止体
側へ静止像を伝達する多心光ロータリージヨイントを実
現するため、側面の一つが平面で、向かい合う側面がこ
の平面と平行な直線を母線とし、母線に垂直な方向に正
の曲率を有する柱面である、シリンドリカルレンズ二つ
を、それぞれのレンズの曲面の母線が互いに平行に、そ
して両レンズの距離（厳密には主面の距離）が焦点距離
の和に等しくなるよう配置し、両レンズを一体として、
レンズの曲面の曲率中心を通り、レンズの平面に垂直な
軸の回りに、所定の速度で回転できるように構成した。In the present invention, even if the number of optical fibers used as a transmission path is large, a multi-core fiber that transmits a static image from the rotating body side to the stationary body side without increasing optical loss between the rotating body side optical collimator and the stationary side collimator. In order to realize the optical rotary joint, we used two cylindrical lenses, one of whose side surfaces is a flat surface, and the opposite side surface is a cylindrical lens whose generatrix is a straight line parallel to this plane, and which has a positive curvature in the direction perpendicular to the generatrix. , arrange the curved surfaces of each lens so that their generating lines are parallel to each other, and the distance between both lenses (strictly speaking, the distance between their principal surfaces) is equal to the sum of their focal lengths, and when both lenses are integrated,
It was configured to be able to rotate at a predetermined speed around an axis that passes through the center of curvature of the curved surface of the lens and is perpendicular to the plane of the lens.
所定の速度とは、−方のレンズに入射する光束がレンズ
の回転軸に平行に、その回りを回転するとき、この光束
の回転速度の１／２の速度である。柱面は円柱面のほか
、楕円柱面、放物線柱面、双曲線柱面等でもよい。The predetermined speed is a speed that is 1/2 of the rotation speed of the light beam incident on the negative lens when the light beam is rotated around the rotation axis of the lens in parallel to the rotation axis of the lens. In addition to the cylindrical surface, the cylindrical surface may be an elliptical cylindrical surface, a parabolic cylindrical surface, a hyperbolic cylindrical surface, or the like.
二つのシリンドリカルレンズは、平面の側面を向い合せ
て配置することが好ましいが、円柱面等の曲線柱面を向
い合せてもよい。Although it is preferable that the two cylindrical lenses are arranged with their flat side surfaces facing each other, their curved cylindrical surfaces such as cylindrical surfaces may be facing each other.
以下に実施例を示し、本発明のさらに詳細な説明とする
。Examples are shown below to provide a more detailed explanation of the present invention.
〔実施例１〕 □
実施例について説明する前に、シリンドリカルレンズの
光学的原理について、第４図を参照しつつ説明する。シ
リンドリカルレンズは母線が平行な二つの円柱面（もし
くは楕円柱面等）、または円柱面（もしくは楕円柱面等
）と平面を対向する側面として有する柱状レンズであり
、円柱面等の母線の方向には屈折力を有せず、それと垂
直な方向についてのみ屈折力を有する。第４図には、屈
折率ｎの透明体４２の側面を半径Ｒの円柱面４３と平面
４４とで構成したシリンドリカルレンズ４１と、入射す
る光束ｌの、円柱面４３の母線に垂直な断面を示す。レ
ンズの中心軸Ｘは、平面の側面４４に垂直な、円柱面４
３の半径に相当する。[Example 1] □ Before describing the example, the optical principle of a cylindrical lens will be described with reference to FIG. 4. A cylindrical lens is a columnar lens that has two cylindrical surfaces (or elliptical cylindrical surfaces, etc.) whose generating lines are parallel, or a cylindrical surface (or elliptical cylindrical surface, etc.) and a flat surface as opposing sides, and the direction of the generating line of the cylindrical surface, etc. has no refractive power, but only in the direction perpendicular to it. FIG. 4 shows a cylindrical lens 41 in which the side surface of a transparent body 42 with a refractive index n is composed of a cylindrical surface 43 with a radius R and a flat surface 44, and a cross section of an incident light beam l perpendicular to the generatrix of the cylindrical surface 43. show. The central axis X of the lens is perpendicular to the plane side surface 44,
It corresponds to a radius of 3.
中心軸Ｘに平行な光束ｌは、中心軸Ｘ上の、レンズ４１
から焦点距離ｆ離れた位置に収斂する。焦点距離ｆは、
屈折率をｎ、円柱面４３の半径Ｒとするとき、ｆ＝Ｒ／
、（ｎ−１）で与えられる。これは通常の球面レンズに
おける焦点距離に相当するが、入射する平行光束の収斂
は、距離ｆの位置にある、円柱面４３の母線に平行（図
の紙面に垂直）な直線上に行われる。円断面をもつ光束
１か中心軸Ｘに沿って入射したとき、中心軸Ｘを横断す
る直線Ｚ＋−Ｚ＋ 、Ｚｉ Ｚ！ 、Ｚｘ−Ｚ−、Ｚ４
−Ｚ４に沿った中心軸Ｘに垂直な光束の断面を、各線分
の延長上に示した。The light beam l parallel to the central axis X is the lens 41 on the central axis
It converges at a position a focal length f away from . The focal length f is
When the refractive index is n and the radius of the cylindrical surface 43 is R, f=R/
, (n-1). This corresponds to the focal length of a normal spherical lens, but the incident parallel light beam is converged on a straight line parallel to the generatrix of the cylindrical surface 43 (perpendicular to the plane of the drawing) at a distance f. When a light beam 1 with a circular cross section is incident along the central axis X, a straight line Z+-Z+, Zi Z! that intersects the central axis X. , Zx-Z-, Z4
A cross section of the light beam perpendicular to the central axis X along -Z4 is shown on the extension of each line segment.
以下に実施例を説明する。第１図に本発明の光多心ロー
タリージヨイントの光学系を示す。第１図（Ａ）および
（Ｂ）で、回転側のコリメータ３と静止側のコリメータ
５の間には、回転側のシリンドリカルレンズ１１と静止
側のシリンドリカルレンズ１２が、それぞれの円柱面の
母線１１ａ。Examples will be described below. FIG. 1 shows the optical system of the optical multi-core rotary joint of the present invention. In FIGS. 1(A) and (B), between the collimator 3 on the rotating side and the collimator 5 on the stationary side, a cylindrical lens 11 on the rotating side and a cylindrical lens 12 on the stationary side are connected to the generatrix 11a of the respective cylindrical surfaces. .
１２ａが互いに平行に、平面の側面１１ｂ、１２ｂが向
き合うように、そして両レンズの焦点０（実際には直線
をなすが、便宜上焦点と呼ぶ）が一致する距離を隔てて
、配置されている。第１図（Ａ）および（Ｂ）は、シリ
ンドリカルレンズ１１および１２の円柱面の母線１１ａ
、１２ａに平行および垂直な断面をそれぞれ示す。ここ
で、シリンドリカルレンズ１１および１２の焦点０を通
り、入射光束７に平行な直線をこの光学系の中心軸Ｘと
呼ぶことにし、中心軸Ｘに平行な軸をＸルンズの円柱面
の母線の方向の軸をｙ、中心軸Ｘに垂直で紙面に沿った
方向の軸を２とする。コリメータ３に入射する光束７は
常にｙ軸に平行に、中心軸Ｘの回りを回転する（中心軸
Ｘとの距離をｈとする）。この回転に対し、シリンドリ
カルレンズ１１および１２は一体として、図示しない回
転機構により、回転側コリメータ３、従って光束７の回
転速度の１／２の速度で、中心軸Ｘの回りに回転できる
ように構成されている。第１図（Ｂ）は、光束７が中心
軸Ｘを含みｙ軸に垂直な面内にある状態を示している。12a are arranged parallel to each other so that the planar side surfaces 11b and 12b face each other, and at a distance such that the focal point 0 of both lenses (actually a straight line, but referred to as the focal point for convenience) coincides with each other. FIGS. 1(A) and 1(B) show the generatrix 11a of the cylindrical surfaces of the cylindrical lenses 11 and 12.
, 12a are shown in parallel and perpendicular sections, respectively. Here, the straight line passing through the focal point 0 of the cylindrical lenses 11 and 12 and parallel to the incident light beam 7 is called the central axis X of this optical system, and the axis parallel to the central axis X is the generatrix of the cylindrical surface of the X lenses. The directional axis is y, and the axis perpendicular to the central axis X and along the plane of the paper is 2. The light beam 7 incident on the collimator 3 always rotates around the central axis X in parallel to the y-axis (the distance from the central axis X is h). In response to this rotation, the cylindrical lenses 11 and 12 are configured to be able to rotate as a unit around the central axis X at a speed that is half the rotation speed of the rotating side collimator 3, and thus the light beam 7, by a rotation mechanism (not shown). has been done. FIG. 1(B) shows a state in which the light beam 7 is in a plane that includes the central axis X and is perpendicular to the y-axis.
光束７は回転側のコリメータ３を経て平行光束７ｃとな
り、シリンドリカルレンズ１１により屈折されて光束７
ｄとなり、シリンドリカルレンズ１１とシリンドリカル
レンズ１２の共通の焦点Ｏを経てシリンドリカルレンズ
１２に入射し、再び平行光束７ｅとなり、静止側のコリ
メータ５を経て光束８として取り出される。中心軸Ｘか
ら入射光束７までの距離りと光束８までの距離ｈ′は等
しい。すなわち、シリンドリカルレンズ１１および１２
はＺ軸方向の倍率が１のアフォーカル光学系を形成する
。二本の平行光束７Ｃと、対応する二本の光束７ｅは、
Ｚ軸に対する関係が反転しており、光束７に含まれる像
は光束８中で反転することを示す。The light beam 7 passes through the collimator 3 on the rotating side, becomes a parallel light beam 7c, is refracted by the cylindrical lens 11, and becomes the light beam 7.
d, enters the cylindrical lens 12 through a common focal point O of the cylindrical lenses 11 and 12, becomes a parallel light beam 7e again, and is extracted as a light beam 8 through the collimator 5 on the stationary side. The distance from the central axis X to the incident light beam 7 and the distance h' from the light beam 8 are equal. That is, the cylindrical lenses 11 and 12
forms an afocal optical system with a magnification of 1 in the Z-axis direction. Two parallel light fluxes 7C and two corresponding light fluxes 7e are
The relationship with respect to the Z axis is reversed, indicating that the image contained in the light beam 7 is reversed in the light beam 8.
光束７，７ｃが中心軸Ｘの回りに回転するに伴い、シリ
ンドリカルレンズ１１および１２は、−体として、回転
側コリメータの１／２の回転速度で回転される。このと
きの、光束７に垂直な断面での入射光束７と出力光束８
との関係を、第２図に示す。第２図で円２１は入射光束
７の回転の軌跡を、直線２２はシリンドリカルレンズ１
１および１２の円柱面の母線の方向を示す。第２図（Ａ
）に示すように、Ｏで示した入射光束７が円２１上で中
心軸Ｘに対し最も上（Ｚ軸方向で）にある場合には、光
束は矢印で示すように伝達され、×で示す出力光束８は
入射光束７と中心軸Ｘに関し対称の位置に得られる。第
２図（Ｂ）に示すように、○で示した入射光束７が第２
図（Ａ）に示した位置から９０°反時計方向に回転した
位置まで回転すると、シリンドリカルレンズ１１および
１２は光束７の回転速度の１／２の速度で回転するので
、シリンドリカルレンズの円柱面の母線の方向を示す直
線２２は４５°反時計方向に回転する。光束７はシリン
ドリカルレンズ１１および１２を通過する際、第１図で
示したように、それらの円柱面の母線に垂直な面内を矢
印で示すように伝達されるので、×で示す出力光束８の
位置は、結果として第２図（Ａ）に示したのと同じ位置
になる。Ｏで示した入射光束７が、円２１上で第２図（
Ｃ）に示す位置（中心軸Ｘに対しＺ軸方向で最も低い位
置）まで回転した場合には、シリンドリカルレンズ１１
および１２の円柱面の母線２２は第２図（Ａ）に示した
位置から９０°回転するので、入射光束７は中心軸Ｘ上
を通って、屈折されずに、×で示す出力光束８となる。As the light beams 7 and 7c rotate around the central axis X, the cylindrical lenses 11 and 12 are rotated as negative bodies at a rotation speed 1/2 that of the rotation side collimator. At this time, the incident light flux 7 and the output light flux 8 in a cross section perpendicular to the light flux 7
The relationship between the two is shown in Figure 2. In FIG. 2, a circle 21 represents the locus of rotation of the incident light beam 7, and a straight line 22 represents the rotation trajectory of the cylindrical lens 1.
The direction of the generatrix of the cylindrical surfaces of Nos. 1 and 12 is shown. Figure 2 (A
), when the incident light beam 7 shown by O is at the top (in the Z-axis direction) with respect to the central axis X on the circle 21, the light beam is transmitted as shown by the arrow, and is shown by The output light beam 8 is obtained at a position symmetrical to the incident light beam 7 with respect to the central axis X. As shown in FIG. 2(B), the incident light beam 7 indicated by ○ is the second
When rotated 90° counterclockwise from the position shown in Figure (A), the cylindrical lenses 11 and 12 rotate at 1/2 the rotation speed of the light beam 7, so the cylindrical surface of the cylindrical lens The straight line 22 indicating the direction of the generatrix is rotated 45° counterclockwise. When the light beam 7 passes through the cylindrical lenses 11 and 12, it is transmitted in a plane perpendicular to the generatrix of the cylindrical surfaces as shown by the arrow, as shown in FIG. As a result, the position is the same as that shown in FIG. 2(A). The incident light beam 7 indicated by O is shown in FIG. 2 on the circle 21 (
When rotated to the position shown in C) (the lowest position in the Z-axis direction with respect to the central axis X), the cylindrical lens 11
Since the generating line 22 of the cylindrical surface 12 and 12 is rotated by 90 degrees from the position shown in FIG. 2(A), the incident light beam 7 passes on the central axis Become.
以上から明らかなように、第２図（Ａ）ないしくＣ）の
いずれでも、×で示す出力光束８の位置は変わらない。As is clear from the above, the position of the output light beam 8 indicated by x does not change in any of FIGS. 2(A) to 2C).
第２図には代表例として入射光束７の三つの位置のみを
示したが、それ以外の位置でも出力光束８の位置は常に
一定である。理解を容易にするため、第２図（Ｃ）に示
した状態での光束について、第１図に対応する断面を第
３図に示す。第３図から理解されるように、第２図（Ｃ
）に対応する状態では、入射光束７に含まれる正立像は
、出力光束８において正立像となる。Although FIG. 2 shows only three positions of the incident light beam 7 as a representative example, the position of the output light beam 8 is always constant even at other positions. To facilitate understanding, FIG. 3 shows a cross section corresponding to FIG. 1 regarding the light flux in the state shown in FIG. 2(C). As understood from Fig. 3, Fig. 2 (C
), the erect image contained in the incident light beam 7 becomes an erect image in the output light beam 8.
屈折率ｎと円柱面の半径Ｒは任意に選べるが、例えば、
シリンドリカルレンズ１１および１２に同じものを用い
、それらの屈折率ｎを１．５、円柱面の半径Ｒを１０ｍ
ｍとすると、ｆ＝Ｒ／（ｎ−１）＝２０ｍｍとなり、シ
リンドリカルレンズ１１と１２の距離は４０ｍｍとなる
。焦点距離ｆは、光束の回転半径りにおいて、光束の直
径の範囲内での光路の変動に対し、球面収差が許容でき
る限度において、任意に選ぶことができる。Although the refractive index n and the radius R of the cylindrical surface can be arbitrarily selected, for example,
The same cylindrical lenses 11 and 12 are used, their refractive index n is 1.5, and the radius R of the cylindrical surface is 10 m.
If m, then f=R/(n-1)=20 mm, and the distance between the cylindrical lenses 11 and 12 is 40 mm. The focal length f can be arbitrarily selected as long as the spherical aberration can be tolerated with respect to variations in the optical path within the diameter of the light beam in the radius of rotation of the light beam.
〔実施例２〕
実施例１において、シリンドリカルレンズ１１および１
２に同じものを用い、屈折率ｎを１．５、円柱面の半径
Ｒを４０ｍｍとすると、シリンドリカルレンズ１１およ
び１２の焦点距離ｆはそれぞれｆ＝Ｒ／ （ｎ −１）
＝８０ｍｍ となり、シリンドリカルレンズ１１と
１２の距離は１６０ｍｍとなる。[Example 2] In Example 1, cylindrical lenses 11 and 1
If the same lens is used for 2, the refractive index n is 1.5, and the radius R of the cylindrical surface is 40 mm, the focal length f of the cylindrical lenses 11 and 12 is f=R/ (n -1).
=80mm, and the distance between the cylindrical lenses 11 and 12 is 160mm.
第５図に示した従来のダブプリズムを用いる装置では、
光の波長が０．８μｍ、光束の回−転半径か２０ｍｍの
とき、コリメータ間の距離は２１０ｍｍを必要としたの
に比し、本発明による上述の装置を用いると、同じ光束
を伝達するのにコリメータ間の距離を約５０ｍｍ短縮で
き、結合損失は約２ｄＢ改善された。In the device using the conventional Dove prism shown in Fig. 5,
When the wavelength of light is 0.8 μm and the radius of gyration of the luminous flux is 20 mm, the distance between the collimators would need to be 210 mm. However, when using the above-mentioned device according to the present invention, it is possible to transmit the same luminous flux. The distance between the collimators was shortened by about 50 mm, and the coupling loss was improved by about 2 dB.
〔実施例３〕
実施例１において、シリンドリカルレンズ１１、および
１２は、平面の側面１１ｂおよび１２ｂが向かい合うよ
うに配置したが、それぞれの円柱面を向かい合わせて配
置してもよい。[Example 3] In Example 1, the cylindrical lenses 11 and 12 were arranged so that the planar side surfaces 11b and 12b faced each other, but they may be arranged so that their cylindrical surfaces faced each other.
本発明の多心光ロータリージヨイントによると、伝送路
として用いる光ファイバの本数が多くなっても、回転側
光コリメータと静止側コリメータの間での光損失を増加
させることなく、また装置を大型にせずに、回転体側か
ら静止体側へ静止像を伝達することができる。According to the multi-core optical rotary joint of the present invention, even if the number of optical fibers used as a transmission path increases, the optical loss between the rotating side optical collimator and the stationary side collimator does not increase, and the device can be made larger. A static image can be transmitted from the rotating body side to the stationary body side without having to do so.
第１図（Ａ）および（Ｂ）は本発明の多心光ロータリー
ジヨイントの一実施例の光学系を示す断面図、第２図（
Ａ）ないしくＣ）は光束に垂直な断面での入射光束と出
力光束との関係を示す説明図、第３図は第２図（Ｃ）に
示した状態での光束について実施例の光学系を示す断面
図、第４図はシリンドリカルレンズの光学的原理の説明
図、第５図は従来の多心光ロータリージヨイントを示す
断面図である。
符号の説明
１ａ、１ｂ・・・・・・・光ファイバ
２・・・・−・回転部 ３・・−・−・・コリ
メータ３ａ、３ｂ・・・・・・・回転側コリメータ４・
・−・・・静止部 ４ａ−・−・・・・円筒部５
・・・−・・・コリメータ
５ａ、５ｂ・・・・−・・静止側コリメータ６ａ、６ｂ
・・・・・・静止側光ファイバ７・・・−・・光束
７ａ、７ｂ・・−・・−・・・・・光束７ ｃ、
７ ｄ、 ７ ｅ−−−光束８・−・・・・・光束
１１．１２・・・・・・−・・シリンドリカルレンズ１
１ａ、１２ａ・・・−・・柱面の母線１１ｂ、１２ｂ−
・・・・・・平面の側面５１−・・・・・・ダブプリズ
ム ５２・・・・・・・全反射ミラー５３・・−・・・
・中間部 ５４−・・・・−１・バーニア機構５
５・・・・・・・転輪 ５６．５７−・−・・
・軸受５８ａ、５８ｂ−・・・・・・回転側光ファイバ
と回転側コリメータとの接続部
５９ａ、５９ｂ・・・・・−・静止側コリメータと静止
側光ファイバとの接続部FIGS. 1A and 1B are cross-sectional views showing an optical system of an embodiment of the multi-core optical rotary joint of the present invention, and FIG.
A) or C) is an explanatory diagram showing the relationship between the incident luminous flux and the output luminous flux in a cross section perpendicular to the luminous flux, and Fig. 3 shows the optical system of the example for the luminous flux in the state shown in Fig. 2 (C). 4 is an explanatory diagram of the optical principle of a cylindrical lens, and FIG. 5 is a sectional diagram showing a conventional multi-center optical rotary joint. Explanation of symbols 1a, 1b...Optical fiber 2...Rotating part 3...Collimator 3a, 3b...Rotating side collimator 4...
・---Stationary part 4a---Cylindrical part 5
...Collimator 5a, 5b ...Stationary side collimator 6a, 6b
・・・Station side optical fiber 7・・・−・Light flux
7a, 7b...... Luminous flux 7 c,
7 d, 7 e---Light flux 8...Light flux 11.12...Cylindrical lens 1
1a, 12a... Generating lines 11b, 12b- of the cylindrical surface
...Flat side surface 51--Dove prism 52--Total reflection mirror 53--
・Intermediate part 54-...-1 ・Vernier mechanism 5
5...Rolling wheels 56.57--...
・Bearings 58a, 58b---Connection parts between the rotating side optical fiber and the rotating side collimator 59a, 59b------Connecting parts between the stationary side collimator and the stationary side optical fiber
Claims (2)
前記平面と平行な直線を母線とし、母線に垂直な方向に
正の曲率を有する柱面である、シリンドリカルレンズ二
つを、前記シリンドリカルレンズのそれぞれの前記柱面
の母線が互いに平行で、前記二つのシリンドリカルレン
ズの距離がそれらの焦点距離の和に等しくなるよう配置
し、前記二つのシリンドリカルレンズを一体として、前
記柱面の曲率中心を通り、前記平面に垂直な軸の回りに
、所定の速度で回転できるように構成したことを特徴と
する、多心光ロータリージョイント。(1) Two cylindrical lenses in which one of the side surfaces is a flat surface, and the side surface facing the flat surface is a cylindrical surface having a generatrix line parallel to the plane and a positive curvature in a direction perpendicular to the generatrix line, are connected to the cylindrical lens. The generating lines of the cylindrical surfaces of the lenses are parallel to each other, and the two cylindrical lenses are arranged so that the distance between them is equal to the sum of their focal lengths, and when the two cylindrical lenses are integrated, the center of curvature of the cylindrical surface is A multi-core optical rotary joint, characterized in that it is configured to be able to rotate at a predetermined speed around an axis perpendicular to the plane.
ンズの一方に前記軸に平行に入射する光束が、前記軸の
回りを回転するとき、この回転の速度の１／２の速度で
ある、請求項第１項の多心光ロータリージョイント。(2) The predetermined speed is a speed that is 1/2 of the speed of rotation when a light beam incident on one of the two cylindrical lenses in parallel to the axis rotates around the axis. Multi-core optical rotary joint in item 1.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2328243A JPH07104460B2 (en) | 1990-11-28 | 1990-11-28 | Multi-core optical rotary joint |
| EP91120262A EP0488205B1 (en) | 1990-11-28 | 1991-11-27 | Multi-port fiberoptic rotary joint |
| DE69126845T DE69126845D1 (en) | 1990-11-28 | 1991-11-27 | Fiber optic rotary coupling with multiple access |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2328243A JPH07104460B2 (en) | 1990-11-28 | 1990-11-28 | Multi-core optical rotary joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04195106A true JPH04195106A (en) | 1992-07-15 |
| JPH07104460B2 JPH07104460B2 (en) | 1995-11-13 |
Family
ID=18208040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2328243A Expired - Lifetime JPH07104460B2 (en) | 1990-11-28 | 1990-11-28 | Multi-core optical rotary joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07104460B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010513961A (en) * | 2006-12-22 | 2010-04-30 | シュライフリング ウント アパラーテバウ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Optical rotary coupler with large return loss |
| WO2011137983A1 (en) * | 2010-05-04 | 2011-11-10 | Georg-Simon-Ohm Hochschule für angewandte Wissenschaften Fachhochschule Nürnberg | Optical rotary transmitter |
| CN104238024A (en) * | 2014-09-29 | 2014-12-24 | 上海理工大学 | Off-axis optical fiber rotating connector based on annular cylindrical lenses |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61259208A (en) * | 1985-05-14 | 1986-11-17 | Tokyo Optical Co Ltd | Connector for multicore optical fiber |
-
1990
- 1990-11-28 JP JP2328243A patent/JPH07104460B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61259208A (en) * | 1985-05-14 | 1986-11-17 | Tokyo Optical Co Ltd | Connector for multicore optical fiber |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010513961A (en) * | 2006-12-22 | 2010-04-30 | シュライフリング ウント アパラーテバウ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Optical rotary coupler with large return loss |
| WO2011137983A1 (en) * | 2010-05-04 | 2011-11-10 | Georg-Simon-Ohm Hochschule für angewandte Wissenschaften Fachhochschule Nürnberg | Optical rotary transmitter |
| US9291777B2 (en) | 2010-05-04 | 2016-03-22 | Technische Hochschule Georg Simon Ohm | Optical rotary transmitter |
| CN104238024A (en) * | 2014-09-29 | 2014-12-24 | 上海理工大学 | Off-axis optical fiber rotating connector based on annular cylindrical lenses |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07104460B2 (en) | 1995-11-13 |
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