JPH01100502A - Converging rod lens - Google Patents

Converging rod lens

Info

Publication number
JPH01100502A
JPH01100502A JP25766387A JP25766387A JPH01100502A JP H01100502 A JPH01100502 A JP H01100502A JP 25766387 A JP25766387 A JP 25766387A JP 25766387 A JP25766387 A JP 25766387A JP H01100502 A JPH01100502 A JP H01100502A
Authority
JP
Japan
Prior art keywords
rod lens
outer peripheral
diameter end
peripheral surface
small
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
JP25766387A
Other languages
Japanese (ja)
Inventor
Nobuo Shiga
信夫 志賀
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP25766387A priority Critical patent/JPH01100502A/en
Publication of JPH01100502A publication Critical patent/JPH01100502A/en
Pending legal-status Critical Current

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  • Optical Couplings Of Light Guides (AREA)

Abstract

PURPOSE:To facilitate positioning and to improve the productivity of various optical devices which use converging rod lenses by tapering the outer peripheral surface of the converging rod lens along its center axis. CONSTITUTION:A virtual column having a small-diameter end surface as its bottom surface has its refractive index distributed parabolically from the center axis 2 to the outer peripheral surface 5. The converging rod lens in the shape of the frustrum of a circular cone like this is easily obtained by cutting the outer peripheral surface of a conventional cylindrical rod lens for tapering. Namely, the outer peripheral surface is tapered along the center axis, so the diameter of a rod lens holder is made larger than the small-diameter end surface of the rod lens and smaller than the large-diameter end surface. Consequently, the rod lens is inhibited from being inserted beyond a proper position determined by the relation with the opening of the rod lens holder when inserted from the small-diameter end surface side.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、屈折率が中心軸から外周面に向かって放物線
状に分布している集束形ロッドレンズに関するものであ
る。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a focusing rod lens in which the refractive index is distributed parabolically from the central axis toward the outer peripheral surface.

〔従来の技術〕[Conventional technology]

集束形ロッドレンズは円柱形状のガラス体で構成されて
おり、端面の直径が1〜2止、軸方向の長さが2〜3 
am程度の非常に小型のものが既に製作され市販されて
いる。かかる超小型集束形ロッドレンズは小型であるた
めに非常に狭い領域に設置可能であり、光通信、光情報
処理等の分野に広く用いられている。
A focusing rod lens is composed of a cylindrical glass body, with an end face diameter of 1 to 2 stops and an axial length of 2 to 3
A very small one, about the size of an am, has already been manufactured and commercially available. Such ultra-small focusing rod lenses are small and can be installed in very narrow areas, and are widely used in fields such as optical communication and optical information processing.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

ところで、かかる集束形ロッドレンズを種々の光デバイ
スに適用する場合にはその位置決めが極めて重要である
。たとえば、集束形ロッドレンズを光受信モジュールに
用いる場合には、受光素子と光ファイバとの間の最適な
位置に固定する必要がある。位置決めには、光軸方向の
位置決めと光軸に垂直な方向の位置決めとがあるが、従
来の集束形ロッドレンズは円柱状であるため光軸方向の
位置決め固定が煩わしかった。すなわち、ロッドレンズ
を固定するための円筒状ホルダを光軸方向および光軸に
垂直な方向に位置決めしておいても、従来のロッドレン
ズは、ホルダ中を光軸方向にスライドすることができる
ため、ロッドレンズをホルダに固定する際に光軸方向の
位置決めをしなければならない。
By the way, when applying such a focusing rod lens to various optical devices, its positioning is extremely important. For example, when a focusing rod lens is used in an optical receiver module, it needs to be fixed at an optimal position between the light receiving element and the optical fiber. Positioning includes positioning in the optical axis direction and positioning in a direction perpendicular to the optical axis, but since conventional focusing rod lenses have a cylindrical shape, positioning and fixing in the optical axis direction is troublesome. In other words, even if the cylindrical holder for fixing the rod lens is positioned in the optical axis direction and in the direction perpendicular to the optical axis, conventional rod lenses can slide in the holder in the optical axis direction. When fixing the rod lens to the holder, it is necessary to position the rod lens in the optical axis direction.

〔問題を解決するための手段〕[Means to solve the problem]

本発明の集束形ロッドレンズは、上記問題点に鑑みて為
されたものであり、外周面が前記中心軸に沿ってテーパ
状になっているものである。
The convergent rod lens of the present invention was created in view of the above problems, and has an outer circumferential surface tapered along the central axis.

〔作用〕[Effect]

外周面が中心軸に沿ってテーパ状になっているので、ロ
ッドレンズホルダの口径をロッドレンズの小径端面より
大きく、大径端面より小さくしておけば、そのロッドレ
ンズホルダの開口にロッドレンズを小径端面側から挿入
したとき、ロッドレンズホルダの開口との関係において
定まる適当な位置でそれ以上の挿入が阻止される。
Since the outer peripheral surface is tapered along the central axis, if the aperture of the rod lens holder is made larger than the small diameter end face of the rod lens and smaller than the large diameter end face, the rod lens can be inserted into the opening of the rod lens holder. When inserted from the small diameter end surface side, further insertion is blocked at an appropriate position determined by the relationship with the opening of the rod lens holder.

〔実施例〕〔Example〕

第1図は本発明の一実施例を示す斜視図である。 FIG. 1 is a perspective view showing an embodiment of the present invention.

本実施例の集束形ロッドレンズ1は光学ガラス体で作ら
れており、円錐台形状をしている。同図において、2は
中心軸、3は小径端面、4は大径端面、5は外周面であ
る。第2図(A)は、第1図に示す集束形ロッドレンズ
1を左方から見た平面図であり、同図(B)はこの平面
図に対応する屈折率の分布を示す図である。この第2図
かられかるように、小径端面3を底面とする仮想円柱に
おいて、屈折率が中心軸2から外周面5に向かって放物
線状に分布している。なお、この仮想円柱のさらに外側
の部分の屈折率は特に限定されるものではなくいかなる
ものであっても良い。
The focusing rod lens 1 of this embodiment is made of optical glass and has a truncated cone shape. In the figure, 2 is a central axis, 3 is a small diameter end face, 4 is a large diameter end face, and 5 is an outer peripheral surface. FIG. 2(A) is a plan view of the focusing rod lens 1 shown in FIG. 1, viewed from the left, and FIG. 2(B) is a diagram showing the refractive index distribution corresponding to this plan view. . As can be seen from FIG. 2, the refractive index is distributed parabolically from the central axis 2 toward the outer circumferential surface 5 in the virtual cylinder having the small-diameter end surface 3 as the bottom surface. Note that the refractive index of the outer portion of this virtual cylinder is not particularly limited and may be of any value.

この様な円錐台形の集束形ロッドレンズ1は、従来から
ある円柱状ロッドレンズの外周面を切削してテーパを施
すことにより容易に得ることができる。
Such a truncated cone-shaped focusing rod lens 1 can be easily obtained by cutting and tapering the outer peripheral surface of a conventional cylindrical rod lens.

第3図は、本実施例の集束形ロッドレンズ1を受光モジ
ュールに適用した例を示す斜視図である。
FIG. 3 is a perspective view showing an example in which the converging rod lens 1 of this embodiment is applied to a light receiving module.

基台10には、ファイバホルダ11、レンズホルダ12
、混成集積回路基板13が順に取り付は固定されている
。ファイバホルダ11には1条のV溝14が切られてお
り、このV溝14にガイドされて光ファイバ15が保持
されている。混成集積回路基板13上には、受光素子チ
ップ16の搭載された受光素子チップキャリア17が載
置されている。レンズホルダ12の内壁は、集束形ロッ
ドレンズ1の外周面5に施されたテーパと等しい角度で
テーパが施されており、ファイバホルダ11側の開口径
が受光素子チップ16側の開口径よりも大きい。ただし
、ファイバホルダ11側の開口径は大径端面4よりは小
さくなっている。
The base 10 has a fiber holder 11 and a lens holder 12.
, hybrid integrated circuit board 13 are fixedly mounted in order. A single V-groove 14 is cut in the fiber holder 11, and an optical fiber 15 is held while being guided by this V-groove 14. A light receiving element chip carrier 17 on which a light receiving element chip 16 is mounted is placed on the hybrid integrated circuit board 13 . The inner wall of the lens holder 12 is tapered at an angle equal to the taper made on the outer peripheral surface 5 of the focusing rod lens 1, and the aperture diameter on the fiber holder 11 side is larger than the aperture diameter on the light receiving element chip 16 side. big. However, the opening diameter on the fiber holder 11 side is smaller than that on the large diameter end face 4.

このように形成されているレンズホルダ12に対して、
集束形ロッドレンズ1を小径端面3を頭にしてファイバ
ホルダ11側から挿入すると、集束形ロッドレンズ1の
外周面5とレンズホルダ12の内壁面とが密着した位置
においてそれ以上の挿入が阻止される。したがって、集
束形ロッドレンズ1の寸法とレンズホルダ12の寸法と
を規格化しておけば、集束形ロッドレンズ1はレンズホ
ルダ12に対して所望の位置に正確に接着固定すること
ができる。このことから、レンズホルダ12をファイバ
ホルダ11および受光素子チップ16に対して正確に位
置決めしておけば、集束形ロッドレンズ1をレンズホル
ダ12に単に挿入するだけで集束形ロッドレンズ1を正
確に位置決めすることができる。
For the lens holder 12 formed in this way,
When the focusing rod lens 1 is inserted from the fiber holder 11 side with the small diameter end face 3 at the head, further insertion is blocked at a position where the outer peripheral surface 5 of the focusing rod lens 1 and the inner wall surface of the lens holder 12 are in close contact. Ru. Therefore, by standardizing the dimensions of the focusing rod lens 1 and the dimensions of the lens holder 12, the focusing rod lens 1 can be accurately adhesively fixed to the lens holder 12 at a desired position. From this, if the lens holder 12 is accurately positioned with respect to the fiber holder 11 and the light receiving element chip 16, the focusing rod lens 1 can be accurately positioned by simply inserting the focusing rod lens 1 into the lens holder 12. Can be positioned.

なお、この受光モジュールでは、ファイバホルダ11、
レンズホルダ12を基台10に対して別途取り付けるよ
うな構造となっているが、これらをパッケージを含めて
一体に成形すれば一層生産性の向上を図ることができる
Note that in this light receiving module, the fiber holder 11,
Although the structure is such that the lens holder 12 is separately attached to the base 10, productivity can be further improved by molding them together with the package.

第1図に示す本実施例の集束形ロッドレンズ1は円錐台
形状であるが、本発明はこれに限定されるものではなく
、多角錐台形状であってもよい。
Although the focusing rod lens 1 of this embodiment shown in FIG. 1 has a truncated cone shape, the present invention is not limited to this, and may have a polygonal truncated pyramid shape.

また、外周面5は必ずしも全面にわたって滑らかな面で
なくとも良く、例えば円周方向の回転を防止するために
、外周面5の一部に溝等が形成されていてもよい。
Further, the outer circumferential surface 5 does not necessarily have to be a smooth surface over the entire surface; for example, a groove or the like may be formed in a part of the outer circumferential surface 5 in order to prevent rotation in the circumferential direction.

さらに、集束形ロッドレンズ1の適用例として受光モジ
ュールを示したが、これは一連用例であって、光コネク
タ、光センサ等の各種の光デバイスにも適用することが
できる。
Further, although a light receiving module is shown as an application example of the focusing rod lens 1, this is a series of applications, and can also be applied to various optical devices such as optical connectors and optical sensors.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明の集束形ロッドレンズによれ
ば、外周面が中心軸に沿ってテーパ状になっているので
、光軸方向の移動を規制し易い。
As explained above, according to the convergent rod lens of the present invention, since the outer circumferential surface is tapered along the central axis, movement in the optical axis direction can be easily restricted.

そのため、位置決めが容易となり、集束形ロッドレンズ
を用いた各種光デバイスの生産性の向上を図ることがで
きる。
Therefore, positioning becomes easy, and productivity of various optical devices using converging rod lenses can be improved.

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

第1図は本発明の一実施例を示す斜視図、第2図は第1
図の実施例の屈折率分布を説明するための図、第3図は
第1図の実施例の適用例を示す斜視図である。 1・・・集束形ロッドレンズ、2・・・中心軸、3・・
・小径端面、4・・・大径端面、5・・・外周面。 特許出願人  住友電気工業株式会社 代理人弁理士   長谷用  芳  樹間      
  塩   1)  辰   也実施例 第1図 屈折率の分布 第2図
FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
A diagram for explaining the refractive index distribution of the embodiment shown in the figure, and FIG. 3 is a perspective view showing an example of application of the embodiment of FIG. 1... Focusing rod lens, 2... Central axis, 3...
・Small diameter end face, 4...Large diameter end face, 5...Outer peripheral surface. Patent applicant: Sumitomo Electric Industries, Ltd. Representative patent attorney Yoshiki Hase
Salt 1) Tatsuya Example Figure 1 Distribution of refractive index Figure 2

Claims (1)

【特許請求の範囲】[Claims] 屈折率が中心軸から外周面に向かって放物線状に分布し
ている集束形ロッドレンズにおいて、前記外周面が前記
中心軸に沿ってテーパ状になっていることを特徴とする
集束形ロッドレンズ。
What is claimed is: 1. A convergent rod lens in which the refractive index is distributed parabolically from a central axis toward an outer circumferential surface, wherein the outer circumferential surface is tapered along the central axis.
JP25766387A 1987-10-13 1987-10-13 Converging rod lens Pending JPH01100502A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25766387A JPH01100502A (en) 1987-10-13 1987-10-13 Converging rod lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25766387A JPH01100502A (en) 1987-10-13 1987-10-13 Converging rod lens

Publications (1)

Publication Number Publication Date
JPH01100502A true JPH01100502A (en) 1989-04-18

Family

ID=17309373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25766387A Pending JPH01100502A (en) 1987-10-13 1987-10-13 Converging rod lens

Country Status (1)

Country Link
JP (1) JPH01100502A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903602A2 (en) * 1997-09-11 1999-03-24 Sumitomo Wiring Systems, Ltd. Structure for connecting a plastic optical fiber to a photodetector
KR100656253B1 (en) * 2004-11-09 2006-12-11 (주)라이코 Graded Index Fiber Optic Taper Lens and its fabrication method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS582A (en) * 1981-06-23 1983-01-05 株式会社東芝 Waste heat recovering boiler
JPS59226310A (en) * 1983-06-07 1984-12-19 Nec Corp Optical coupling system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS582A (en) * 1981-06-23 1983-01-05 株式会社東芝 Waste heat recovering boiler
JPS59226310A (en) * 1983-06-07 1984-12-19 Nec Corp Optical coupling system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903602A2 (en) * 1997-09-11 1999-03-24 Sumitomo Wiring Systems, Ltd. Structure for connecting a plastic optical fiber to a photodetector
EP0903602A3 (en) * 1997-09-11 1999-11-24 Sumitomo Wiring Systems, Ltd. Structure for connecting a plastic optical fiber to a photodetector
CN1109908C (en) * 1997-09-11 2003-05-28 住友电装株式会社 Structure for connecting plastic optical fiber to photodetector
KR100656253B1 (en) * 2004-11-09 2006-12-11 (주)라이코 Graded Index Fiber Optic Taper Lens and its fabrication method

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