JPS63168058A - Multiple output led module - Google Patents

Multiple output led module

Info

Publication number
JPS63168058A
JPS63168058A JP61315434A JP31543486A JPS63168058A JP S63168058 A JPS63168058 A JP S63168058A JP 61315434 A JP61315434 A JP 61315434A JP 31543486 A JP31543486 A JP 31543486A JP S63168058 A JPS63168058 A JP S63168058A
Authority
JP
Japan
Prior art keywords
flat surface
led
optical fibers
spherical lens
optical
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
Application number
JP61315434A
Other languages
Japanese (ja)
Inventor
Masao Tanaka
正夫 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
Original Assignee
Fujikura Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP61315434A priority Critical patent/JPS63168058A/en
Publication of JPS63168058A publication Critical patent/JPS63168058A/en
Pending legal-status Critical Current

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  • Led Device Packages (AREA)

Abstract

PURPOSE:To ensure a well-balanced optical coupling for a multiplicity of optical fibers by a method wherein a flat surface is formed on a spherical lens on its portion opposite to the portion facing an LED and the ends of a multiplicity of optical fibers are allowed to be in close contact with the flat surface. CONSTITUTION:On a spherical lens 3 facing an LED 1, there is a flat surface 4 at a portion opposite to the portion facing the LED 1. A spherical lens with a portion thereof flattened may be manufactured with ease by subjecting a spherical lens to such a process as abrading. The ends of a multiplicity of bundled optical fibers 2 are caused to be in close contact with the flat surface 4. In a multiple output LED module of this design, the output radiating from the LED 1 and entering the spherical lens 3 is converged on a flat surface 4. There is a uniform optical distribution on the flat surface 4, which ensures a well-balanced optical coupling for the multiplicity of optical fibers 2.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

この発明は、LED (発光ダイオード)の出力光を多
数の光ファイバにより効率よく出力する、多出力LED
モジュールに関する。
This invention is a multi-output LED that efficiently outputs the output light of an LED (light emitting diode) through a large number of optical fibers.
Regarding modules.

【従来の技術】[Conventional technology]

LEDは半導体レーザに比較して、伝送帯域幅や伝送距
離では劣るが温度や反射光の影響を受けにくく動作が安
定しており、しがち安価、長寿命等の特長を有している
ので、これを用いることにより経済的で簡便な光伝送シ
ステムの構築が可能である。 ところが、このLEDは光放射ビーム角度が広く、半値
幅で120度にも達する。そのため、受光角が小さく、
細径の光ファイバへ光を有効に結合させることは非常に
難しく、どのような光学系を用いてもその光結合効率は
偏か数%にすぎない。 このようにLEDの光を1本の光ファイバに結合させる
のでは光の有効利用が図れないため、従来より、1つの
LEDの光を複数本の光ファイバに結合させた多出力L
EDモジュールが提案されている。これは、第2図に示
すように、1つのしEDIに対して多数本の光ファイバ
2をレンズ5を介して放射状に配置するものである。こ
れによると広角度の出力光をそれぞれのレンズ5により
各光ファイバ2のコア部に選択的に集束させることが容
易であるとともに、LEDlの発光面に垂直な方向のみ
ならず斜め方向に向かう光をも効率よく光ファイバ2に
結合できるため高出力且つ多出力化を図ることができる
。そのためこれを用いるときわめて経済的で簡便な光分
配システムが実現でき、たとえばCATVシステムにお
いて各受信端に信号を分配するときにこのモジュールを
用いることなどが考えられている。
Compared to semiconductor lasers, LEDs are inferior in transmission bandwidth and transmission distance, but they are less susceptible to temperature and reflected light and have stable operation, are often inexpensive, and have long lifespans. By using this, it is possible to construct an economical and simple optical transmission system. However, this LED has a wide light emission beam angle, reaching 120 degrees in half width. Therefore, the acceptance angle is small,
It is very difficult to effectively couple light into a small diameter optical fiber, and no matter what optical system is used, the optical coupling efficiency is only a few percent. Coupling the light from an LED into one optical fiber in this way does not make effective use of the light, so conventionally, a multi-output L that couples the light from one LED into multiple optical fibers has been developed.
An ED module has been proposed. As shown in FIG. 2, a large number of optical fibers 2 are arranged radially through a lens 5 for one EDI. According to this, it is easy to selectively focus wide-angle output light onto the core portion of each optical fiber 2 by each lens 5, and the light is directed not only in a direction perpendicular to the light emitting surface of the LED 1 but also in an oblique direction. can also be efficiently coupled to the optical fiber 2, making it possible to achieve high output and multiple outputs. Therefore, by using this module, an extremely economical and simple optical distribution system can be realized, and it is being considered that this module can be used, for example, when distributing signals to each receiving end in a CATV system.

【発明が解決しようとする問題点】[Problems to be solved by the invention]

しかしながら、従来の多出力LEDモジュールでは、結
合される複数の光ファイバの各々にレンズを備える必要
があるので、これらの各々の組合せにつき光軸調整を行
わなければならず、製造が困難である。また、構造が複
雑であるとともに、大型1ヒしやすい。特に多くの光フ
ァイバを結合させようとすると大型化が避けられず、し
かもこの場合LEDとレンズとの間隔を大きくせざるを
得ないので結合効率が低下する。そこで、実際上光ファ
イバの本数をそれほど多くすることはできない。 この発明は、小型且つ構造簡単で、結合効率を低下させ
ることなく多数本の光ファイバを容易に結合できる、多
出力LEDモジュールを提供することを目的とする。
However, in the conventional multi-output LED module, since it is necessary to provide a lens for each of the plurality of optical fibers to be coupled, the optical axis must be adjusted for each combination of these, making manufacturing difficult. In addition, the structure is complex, and it is easy to carry out large-scale blow-ups. In particular, if a large number of optical fibers are to be coupled together, an increase in size is unavoidable, and in this case, the distance between the LED and the lens must be increased, resulting in a decrease in coupling efficiency. Therefore, in reality, the number of optical fibers cannot be increased that much. An object of the present invention is to provide a multi-output LED module that is small in size, has a simple structure, and can easily couple multiple optical fibers without reducing coupling efficiency.

【問題点を解決するための手段】 この発明による多出力LEDモジュールは、LEDと、
このLEDに対面させられる球レンズと、該レンズのL
EDとは反対側に設けられた平坦面と、該平坦面に各端
面が密着させられた複数本の光ファイバとからなる。
[Means for solving the problem] A multi-output LED module according to the present invention includes LEDs,
A ball lens that faces this LED, and the L of the lens.
It consists of a flat surface provided on the opposite side of the ED, and a plurality of optical fibers each having an end surface in close contact with the flat surface.

【作  用】[For production]

球レンズには平坦面が設けられており、この平坦面の反
対側にLEDが配置されるので、LEDからの出力光は
この球レンズによって平坦面に導かれる。そして、この
平坦面には複数の光ファイバの端面が密着させられてい
るので、球レンズに  。 よって導かれた光は光ファイバに入射することになる。 そのため、光ファイバの1本ずつの光軸調整が不要とな
り、しかも球レンズの平坦面での光分布が均一であるた
め複数本の光ファイバにバランスよく光結合させること
ができるので、製造が容易であって大量生産に適してい
る。さらに構成部品が少なく構造が簡単であり、そのた
め信頼性の向上も容易である。また、多数本の光ファイ
バを結合させる場合にも、球レンズの径を大きくするこ
とにより、L E Dからの広角度で放射される光を光
ファイバに結合させることができ、結合効率を低下させ
ることがない。
The ball lens is provided with a flat surface, and the LED is arranged on the opposite side of this flat surface, so that the output light from the LED is guided by the ball lens to the flat surface. Since the end faces of multiple optical fibers are brought into close contact with this flat surface, it becomes a spherical lens. The guided light thus enters the optical fiber. Therefore, there is no need to adjust the optical axis of each optical fiber, and since the light distribution on the flat surface of the spherical lens is uniform, light can be coupled to multiple optical fibers in a well-balanced manner, making manufacturing easier. It is suitable for mass production. Furthermore, the structure is simple with fewer components, and therefore reliability can be easily improved. Also, when coupling multiple optical fibers, by increasing the diameter of the spherical lens, the light emitted from the LED at a wide angle can be coupled to the optical fibers, reducing the coupling efficiency. I have nothing to do.

【実 施 例】【Example】

この発明の一実施例にかかる多出力LEDモジュールは
第1図のように構成されている。この第1図において、
LEDIに球レンズ3が対面させられており、この球レ
ンズ3のLEDlとは反対側には平坦面4が形成されて
いる。このような平坦面4を持つ球レンズ3は、通常の
球レンズの1箇所を平坦に研磨するなどの加工を加える
ことによって容易に作ることができる。この平坦面4に
、多数の束ねられた光ファイバ2の端面が密着させられ
ている。 この多出力LEDモジュールにおいて、LEDlから広
角度に広がった出力光は、球レンズ3に入射することに
よってその平坦面4に集束する。 平坦面4における光の分布は均一なものとなる。 この平坦面4には束ねられた多数の光ファイバ2の端面
が密着させられているので、平坦面4から外部に出射す
る光が光ファイバ2の各々に入射する。したがって、L
EDIからの出射光の大部分は多数の光ファイバ2の各
々に入射することになって良好な結合効率が得られる。 光ファイバ2の各端面は平坦面4に密着しているので反
射も少なく、結合効率はさらに向上する。 この場合、光軸の調整は1つのLEDIと1つの球レン
ズ3との間で行えばよいので、単一の光ファイバをLE
Dに結合させる場合と同じであって、その調整は極めて
容易である。上記のように球レンズ3の加工も容易であ
るから、この多出力LEDモジュールは容易に製造でき
、低コストで大量生産可能である。また使用部品数も非
常に少なく、信頼性を高めることも容易である。 なお、より多数本の光ファイバ2を結合させる場合には
、球レンズ3の径を大きくし平坦面4の面積を広くすれ
ばよい。
A multi-output LED module according to an embodiment of the present invention is constructed as shown in FIG. In this Figure 1,
A ball lens 3 is made to face the LEDI, and a flat surface 4 is formed on the opposite side of the ball lens 3 from the LEDI. A ball lens 3 having such a flat surface 4 can be easily made by adding processing such as polishing one part of a normal ball lens to a flat surface. The end faces of a large number of bundled optical fibers 2 are brought into close contact with this flat surface 4. In this multi-output LED module, the output light spread over a wide angle from the LED 1 is incident on the ball lens 3 and focused on the flat surface 4 thereof. The distribution of light on the flat surface 4 becomes uniform. Since the end faces of a large number of bundled optical fibers 2 are brought into close contact with this flat surface 4, the light emitted to the outside from the flat surface 4 is incident on each of the optical fibers 2. Therefore, L
Most of the light emitted from the EDI is incident on each of the many optical fibers 2, resulting in good coupling efficiency. Since each end face of the optical fiber 2 is in close contact with the flat surface 4, there is little reflection, and the coupling efficiency is further improved. In this case, the optical axis can be adjusted between one LEDI and one ball lens 3, so a single optical fiber can be adjusted between one LEDI and one ball lens 3.
This is the same as when bonding to D, and the adjustment is extremely easy. Since the ball lens 3 is easy to process as described above, this multi-output LED module can be easily manufactured and mass-produced at low cost. Furthermore, the number of parts used is extremely small, making it easy to improve reliability. Note that when a larger number of optical fibers 2 are to be coupled, the diameter of the ball lens 3 may be increased and the area of the flat surface 4 may be increased.

【発明の効果】【Effect of the invention】

この発明による多出力LEDモジュールは、構戒部品か
少なく且つ構造簡単であって小型化が容易であると共に
信頼性の向上も容易である。また、使用するレンズは1
つであるため光軸の調整も容易で大量生産に適する。さ
らに、多数本の光ファイバにバランスよく光結合でき、
結合効率を低下させることなくより多数の光ファイバに
結合することもできる。
The multi-output LED module according to the present invention has a small number of components and a simple structure, making it easy to downsize and improve reliability. Also, the lens used is 1
This makes it easy to adjust the optical axis and suitable for mass production. Furthermore, it can be optically coupled to multiple optical fibers in a well-balanced manner.
It is also possible to couple to a larger number of optical fibers without reducing coupling efficiency.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の一実施例の模式的な斜視図、第2図
は従来例の模式的な斜視図である。 1・・・LED、2・・・光ファイバ、3・・・球レン
ズ、4・・・平坦面、5・・・レンズ。
FIG. 1 is a schematic perspective view of an embodiment of the present invention, and FIG. 2 is a schematic perspective view of a conventional example. 1... LED, 2... Optical fiber, 3... Ball lens, 4... Flat surface, 5... Lens.

Claims (1)

【特許請求の範囲】[Claims] (1)LEDと、このLEDに対面させられる球レンズ
と、該レンズのLEDとは反対側に設けられた平坦面と
、該平坦面に各端面が密着させられた複数本の光ファイ
バとからなる多出力LEDモジュール。
(1) An LED, a spherical lens facing the LED, a flat surface of the lens provided on the opposite side of the LED, and a plurality of optical fibers each having an end surface in close contact with the flat surface. A multi-output LED module.
JP61315434A 1986-12-29 1986-12-29 Multiple output led module Pending JPS63168058A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61315434A JPS63168058A (en) 1986-12-29 1986-12-29 Multiple output led module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61315434A JPS63168058A (en) 1986-12-29 1986-12-29 Multiple output led module

Publications (1)

Publication Number Publication Date
JPS63168058A true JPS63168058A (en) 1988-07-12

Family

ID=18065326

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61315434A Pending JPS63168058A (en) 1986-12-29 1986-12-29 Multiple output led module

Country Status (1)

Country Link
JP (1) JPS63168058A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011127355A3 (en) * 2010-04-08 2012-02-02 Bae Systems Information And Electronic Systems Integration Inc. Bullet lens design for the dasal seeker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011127355A3 (en) * 2010-04-08 2012-02-02 Bae Systems Information And Electronic Systems Integration Inc. Bullet lens design for the dasal seeker
US8712201B2 (en) 2010-04-08 2014-04-29 Bae Systems Information And Electronic Systems Integration Inc. Bullet lens design for the dasal seeker

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