JP2000357803A - Light transmission module - Google Patents
Light transmission moduleInfo
- Publication number
- JP2000357803A JP2000357803A JP11169314A JP16931499A JP2000357803A JP 2000357803 A JP2000357803 A JP 2000357803A JP 11169314 A JP11169314 A JP 11169314A JP 16931499 A JP16931499 A JP 16931499A JP 2000357803 A JP2000357803 A JP 2000357803A
- Authority
- JP
- Japan
- Prior art keywords
- shield case
- plastic package
- transmission module
- light emitting
- light
- 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
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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4246—Bidirectionally operating package structures
-
- 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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4274—Electrical aspects
- G02B6/4277—Protection against electromagnetic interference [EMI], e.g. shielding means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Light Receiving Elements (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
【発明の属する技術分野】本発明は、発受光素子を保持
するレセプタクルに、光ファイバを保有するプラグを嵌
合して、発受光素子との結合状態を形成する光伝送モジ
ュールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission module in which a plug holding an optical fiber is fitted to a receptacle holding a light emitting and receiving element to form a coupling state with the light emitting and receiving element.
【従来の技術】従来の光伝送モジュールは例えば特開平
６−４３３４３号公報に記載されているものや、図１に
示すように、発受光素子１を収納するプラスティックパ
ッケージ２を収納するレセプタクル３にフェルール４付
き光ファイバ５を保有するプラグ６を嵌合して発受光素
子１の入出力端子７から電気信号を入力または出力する
ように構成されている。放射雑音・外来雑音を防ぐ為に
シールド効果を期待する場合には合成樹脂成形品から成
るレセプタクル３に金属繊維等を混入し、更にシールド
用固定端子８をレセプタクル３に圧入固定する構成とし
ていた。また、図２に示すように、発受光素子１を収納
するプラスティックパッケージ２をシールドケース９に
より覆い、シールド端子１０をこの光伝送モジュールの
実装基板のＧＮＤに接続することでシールド効果を期待
する構成としていた。2. Description of the Related Art A conventional optical transmission module is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-43343 or, as shown in FIG. 1, a receptacle 3 accommodating a plastic package 2 accommodating a light emitting / receiving element 1. A plug 6 holding an optical fiber 5 with a ferrule 4 is fitted to input or output an electric signal from an input / output terminal 7 of the light emitting / receiving element 1. When a shielding effect is expected in order to prevent radiation noise and external noise, metal fibers or the like are mixed in the receptacle 3 made of a synthetic resin molded product, and the shield fixing terminal 8 is press-fitted and fixed to the receptacle 3. As shown in FIG. 2, the plastic package 2 containing the light emitting / receiving element 1 is covered with a shield case 9 and the shield terminal 10 is connected to the GND of the mounting board of the optical transmission module to obtain a shielding effect. And had
【発明が解決しようとする課題】従来の技術では、放射
雑音・外来雑音を防ぐ為に合成樹脂成形品から成るレセ
プタクルに金属繊維等を混入していたが、この方法では
金属繊維混入量のばらつきや、合成樹脂内における金属
繊維の偏りによる抵抗値変動から、期待するシールド効
果を得られない問題が内在している。また、プラスティ
ックパッケージをシールドケースにより覆う方法の場
合、板金加工より成るシールドケースの板金肉厚分、光
ファイバと発受光素子との結合損失が大きくなり、発光
素子に流す電流を増加させなければならないと言う信頼
性に関わる問題がある。本発明は上記問題点を簡易な構
成部品より解決し、低価格な光リンクを提供する。In the prior art, metal fibers are mixed in a receptacle made of a synthetic resin molded product in order to prevent radiation noise and external noise. In addition, there is a problem that the expected shielding effect cannot be obtained due to the resistance value fluctuation due to the bias of the metal fibers in the synthetic resin. Further, in the case of covering the plastic package with the shield case, the coupling loss between the optical fiber and the light emitting / receiving element is increased by the thickness of the sheet metal of the shield case formed by sheet metal processing, and the current flowing through the light emitting element must be increased. There is a problem related to reliability. The present invention solves the above problems with simple components and provides an inexpensive optical link.
【課題を解決するための手段】放射雑音・外来雑音によ
る問題を解決するためには、発受光素子を各々収納する
プラスティックパッケージをシールドケースにより覆う
構成とし、且つ、各々の上記プラスティックパッケージ
を隔離できるように板金加工を施す。また、光ファイバ
心線を保持するフェルールが金属の場合には特に外来雑
音耐量が低下するため、上記フェルールと上記シールド
ケースを接触させ電気的導通を得られるような構成とす
る。更に上記シールドケースからのシールド端子を本発
明品が実装される基板のＧＮＤパターンに接続すること
で容易に雑音を除去し得る。また、プラスティックパッ
ケージをシールドケースにより覆う方法の場合、上記シ
ールドケースの板金肉厚分、光ファイバと発受光素子と
の結合効率が低下する問題がある。この問題を解決する
ためには、発受光素子収納部周辺の上記プラスティック
パッケージ前面を上記シールドケースの通光窓径で上記
シールドケースの板金肉厚分、円筒に突出させる。この
突出部をレンズ形状としても構わない。上記プラスティ
ックパッケージを上記シールドケースに挿入する構造と
する場合には上記シールドケースに通光窓径で上下方向
どちらかに切り込みをいれることで可能にする。プラス
ティックパッケージをシールドケースに挿入しない構造
とする場合には、突出部と浮きピンが逃げられるように
シールドケースに穴を設け、図３のように組み合わせた
後に曲げ加工を施してプラスティックパッケージとシー
ルドケースを組み立てる。また、上記浮きピンはプラス
ティックパッケージ内のＧＮＤ配線を突出させるか、も
しくは該浮きピンと該プラスティックパッケージ内のＧ
ＮＤ配線をワイヤボンディング等の方法より接続するこ
とによって、光伝送モジュールのＧＮＤ端子を実装基板
のＧＮＤ部にはんだ固定することで容易にシールド効果
を期待出来る。In order to solve the problems caused by radiation noise and external noise, a plastic package for accommodating each of the light emitting and receiving elements is covered by a shield case, and each of the plastic packages can be isolated. Sheet metal processing. In addition, when the ferrule holding the optical fiber core is made of metal, the resistance to external noise is particularly reduced. Therefore, the ferrule and the shield case are brought into contact with each other to obtain electrical continuity. Furthermore, noise can be easily removed by connecting the shield terminal from the shield case to the GND pattern of the board on which the product of the present invention is mounted. In the case of covering the plastic package with a shield case, there is a problem that the coupling efficiency between the optical fiber and the light emitting / receiving element is reduced by the thickness of the shield case. In order to solve this problem, the front surface of the plastic package in the vicinity of the light emitting / receiving element housing portion is made to protrude into the cylinder by the sheet metal thickness of the shield case by the light transmission window diameter of the shield case. This protruding portion may have a lens shape. When the plastic package is configured to be inserted into the shield case, it is made possible by making a cut in the shield case in the vertical direction with the diameter of the light transmitting window. In the case where the plastic package is not inserted into the shield case, a hole is provided in the shield case so that the protruding part and the floating pin can escape, and after assembling as shown in FIG. Assemble. Further, the floating pin may protrude the GND wiring in the plastic package, or the floating pin and the G pin in the plastic package may protrude.
By connecting the ND wiring by a method such as wire bonding, the shielding effect can be easily expected by fixing the GND terminal of the optical transmission module to the GND portion of the mounting board by soldering.
【発明の実施の形態】本発明の一実施例を説明する。図
３に本発明の双方向簡易光伝送リンクの構成を示す。本
発明品は発受光素子１４を収納するプラスティックパッ
ケージ１５、該プラスティックパッケージ１５を収納す
るシールドケース１６、該シールドケース１６を収納す
るレセプタクル１７から構成される。上記プラスティッ
クパッケージ１５は透光性を有する合成樹脂より封止さ
れたパッケージであり、全体が扁平で矩形を呈し、入出
力端子が突出する。また、上記シールドケース１６は板
金を曲げ加工して形成した扁平な箱型を呈し、該プラス
ティックパッケージ１５を収容する室が設けられてい
る。上記レセプタクル１７は合成樹脂成形品から成り、
該シールドケース１６を収納する室が設けられている。
上記シールドケース１６の前壁１６ａに通光窓１６ｂを
開口している。また、図６に示すように上記プラスティ
ックパッケージ１５の発受光素子１４収納位置左右側面
から突出させる浮きピン１８は、プラスティックパッケ
ージ１５内のＧＮＤ配線を利用することで該シールドケ
ース１６はシールドケース側面スリット部１６ｄと浮き
ピン１８との接触を通じてＧＮＤピン２１と電気的導通
を得ることが可能であり、容易に雑音を除去し得る。こ
の時、シールドケース側面スリット部１６ｄと浮きピン
１８との接触を密にするためには、シールドケース側面
スリット部１６ｄの寸法を浮きピン１８に対してやや小
さめに設定し、シールドケース側面スリット部１６ｄを
押し拡げながら挿入される方が効果的である。また例え
ば図７に示すように、特にプラスティックパッケージ１
５内に受光処理回路２２を内蔵した場合、内部でのノイ
ズの回り込みを回避するために、浮きピン１８と接続さ
れているＧＮＤピン２１と、受光処理回路のＧＮＤピン
２３とは実装部分で分離することが望ましい。また、図
４に示すようにシールドケース１６の肉厚分、発受光素
子１４を収納するプラスティックパッケージ１５と光フ
ァイバ５のフェルール４端面までの距離が大きくなり、
結合効率が劣化する場合には、図５に示すように発受光
素子１４を収納するプラスティックパッケージ１５前面
に円筒部１５ａに突出させ、該シールドケース１６の肉
厚分だけプラスティックパッケージ１５を、光ファイバ
５のフェルール４端面に近づける事で結合効率が下がる
ことを防ぐ。また該シールドケース１６の前部１６ａに
開口した通光窓１６ｂに切り込みを入れることによっ
て、上記円筒部１５ａを有するプラスティックパッケー
ジ１５は、上記シールドケース１６への挿入が可能とな
る。プラスティックパッケージ１５をシールドケース１
６への挿入を実現する場合には、図５に示すように上記
プラスティックパッケージ１５前面の円筒部１５ａと浮
きピン１８が上記シールドケース１６内に収容された場
合の逃げ部を板金加工しておかなければならない。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described. FIG. 3 shows the configuration of the bidirectional simple optical transmission link of the present invention. The product of the present invention includes a plastic package 15 for housing the light emitting / receiving element 14, a shield case 16 for housing the plastic package 15, and a receptacle 17 for housing the shield case 16. The plastic package 15 is a package sealed with a translucent synthetic resin, has a flat and rectangular shape as a whole, and has input / output terminals protruding. The shield case 16 has a flat box shape formed by bending a sheet metal, and has a chamber for accommodating the plastic package 15. The receptacle 17 is made of a synthetic resin molded product,
A chamber for storing the shield case 16 is provided.
A light transmitting window 16b is opened in a front wall 16a of the shield case 16. Also, as shown in FIG. 6, the floating pins 18 projecting from the left and right side surfaces of the light emitting and receiving elements 14 of the plastic package 15 are formed by utilizing the GND wiring in the plastic package 15 so that the shield case 16 Electrical contact with the GND pin 21 can be obtained through contact between the portion 16d and the floating pin 18, and noise can be easily removed. At this time, in order to make the contact between the shield case side slit portion 16d and the floating pin 18 dense, the dimension of the shield case side slit portion 16d is set slightly smaller than the floating pin 18, and the shield case side slit portion is set. It is more effective to insert while pushing 16d. In addition, as shown in FIG.
In the case where the light receiving processing circuit 22 is built in the GND 5, the GND pin 21 connected to the floating pin 18 and the GND pin 23 of the light receiving processing circuit are separated at a mounting portion in order to avoid noise sneak inside. It is desirable to do. In addition, as shown in FIG. 4, the distance between the plastic package 15 accommodating the light emitting / receiving element 14 and the end face of the ferrule 4 of the optical fiber 5 is increased by the thickness of the shield case 16,
In the case where the coupling efficiency is deteriorated, as shown in FIG. 5, a cylindrical portion 15a is protruded from the front of the plastic package 15 accommodating the light emitting / receiving element 14, and the plastic package 15 is inserted into the optical fiber By lowering the ferrule 4 end face closer to 5, the coupling efficiency is prevented from lowering. The plastic package 15 having the cylindrical portion 15a can be inserted into the shield case 16 by making a cut in the light transmitting window 16b opened in the front portion 16a of the shield case 16. Plastic package 15 in shield case 1
In order to realize the insertion into the shield case 16, the escape portion when the cylindrical portion 15 a on the front surface of the plastic package 15 and the floating pin 18 are accommodated in the shield case 16 is subjected to sheet metal processing as shown in FIG. There must be.
【発明の効果】本発明によれば、耐ノイズ性に優れた光
伝送モジュールを容易に実現できる。According to the present invention, an optical transmission module having excellent noise resistance can be easily realized.
【図１】従来の光伝送モジュール構造を示す斜視図であ
る。FIG. 1 is a perspective view showing a conventional optical transmission module structure.
【図２】従来のシールドケース構造を示す斜視図であ
る。FIG. 2 is a perspective view showing a conventional shield case structure.
【図３】本発明の一実施例を示す斜視図である。FIG. 3 is a perspective view showing one embodiment of the present invention.
【図４】従来のプラスティックパッケージ構造を示す側
視図である。FIG. 4 is a side view showing a conventional plastic package structure.
【図５】（ａ）は請求項３のプラスティックパッケージ
構造を示す側視図、（ｂ）は（ａ）の前視図である。FIG. 5A is a side view showing a plastic package structure according to claim 3, and FIG. 5B is a front view of FIG.
【図６】本発明のシールドケース配線を示す前視図であ
る。FIG. 6 is a front view showing a shield case wiring of the present invention.
【図７】本発明の分離型シールドケース配線を示す前視
図である。FIG. 7 is a front view showing the separated shield case wiring of the present invention.
１…発受光素子、２…プラスティックパッケージ、３…
レセプタクル、４…フェルール、５…光ファイバ、６…
プラグ、７…入出力端子、８…シールド用固定端子、９
…シールドケース、１０…シールド端子、１３…通光
穴、１４…発受光素子、１５…プラスティックパッケー
ジ、１５ａ…プラスティックパッケージ円筒部、１６…
シールドケース、１６ａ…シールドケース前壁、１６ｂ
…シールドケース通光窓、１６ｄ…シールドケース側面
スリット部、１７…レセプタクル、１８…浮きピン、２
１…ＧＮＤピン、２２…受光処理回路、２３…受光処理
回路のＧＮＤピン。1 ... light emitting and receiving element, 2 ... plastic package, 3 ...
Receptacle, 4 ... ferrule, 5 ... optical fiber, 6 ...
Plug, 7: input / output terminal, 8: fixed terminal for shield, 9
... Shield case, 10 ... Shield terminal, 13 ... Light transmission hole, 14 ... Light emitting and receiving element, 15 ... Plastic package, 15a ... Plastic package cylindrical part, 16 ...
Shield case, 16a ... Shield case front wall, 16b
… Shield case light-transmitting window, 16d… Shield case side slit, 17… Receptacle, 18… Floating pin, 2
1: GND pin, 22: Light receiving processing circuit, 23: GND pin of light receiving processing circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 各務 豊 神奈川県横浜市戸塚区戸塚町216番地 株 式会社日立製作所通信システム事業本部内 Ｆターム(参考） 2H037 AA01 BA11 DA03 DA31 5F088 BA03 BB01 EA09 JA14 JA18 JA20 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yutaka Kagami 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 2H037 AA01 BA11 DA03 DA31 5F088 BA03 BB01 EA09 JA14 JA18 JA20
Claims (4)
収納し、該プラスティックパッケージを保持するレセプ
タクルにフェルール付き光ファイバを保有するプラグを
嵌合して、発受光素子との結合状態を形成する光伝送モ
ジュールにおいて、プラスティックパッケージに収納さ
れた発受光素子をシールドケースに収納し、該シールド
ケースを上記レセプタクルに収納し、該シールドケース
前面に発受光素子と光ファイバを保有するプラグとの結
合上に通光窓を設け、上記シールドケースを該プラステ
ィックパッケージのリードフレームに電気的導通ができ
るようにしたことを特徴とする光伝送モジュール。An optical transmission module in which a light emitting / receiving element is housed in a plastic package, and a plug holding an optical fiber with a ferrule is fitted into a receptacle holding the plastic package to form a coupling state with the light emitting / receiving element. In the above, the light emitting / receiving element housed in the plastic package is housed in a shield case, the shield case is housed in the receptacle, and light is transmitted through a connection between the light emitting / receiving element and a plug holding an optical fiber on the front surface of the shield case. An optical transmission module comprising a window, wherein the shield case is electrically connected to a lead frame of the plastic package.
を設け、それをプラスティックパッケージ外へ突出さ
せ、内部ではリードフレームに接続し、上記浮きピンを
該シールドケースに設けたスリット部を通じて電気的導
通ができるようにしたことを特徴とする請求項１記載の
光伝送モジュール。2. A floating pin is provided on the plastic package, and is protruded out of the plastic package. The floating pin is connected to a lead frame inside, so that the floating pin can be electrically connected through a slit provided in the shield case. The optical transmission module according to claim 1, wherein:
に挿入される光ファイバ心線を保持するフェルールが接
触し、電気的導通を得られる構造を有することを特徴と
する請求項１記載の光伝送モジュール。3. The optical transmission system according to claim 1, wherein said shield case and said ferrule holding an optical fiber inserted into said optical transmission module are in contact with each other to provide electrical conduction. module.
入される光ファイバ心線を保持するフェルールの接触に
より電気的導通が得られる構造を有しながら、且つ、該
光ファイバ心線を保持するフェルールと発受光素子を収
納するプラスティックパッケージとの結合ができるよう
に、該シールドケースの通光窓にスリット部を設けた構
造を有することを特徴とする光伝送モジュール。4. A ferrule having a structure in which electrical conduction is obtained by contact between a shield case and a ferrule holding an optical fiber inserted into the optical transmission module, and holding the optical fiber. An optical transmission module having a structure in which a slit portion is provided in a light-transmitting window of the shield case so that the light-transmitting window can be coupled to a plastic package containing a light emitting and receiving element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16931499A JP3950583B2 (en) | 1999-06-16 | 1999-06-16 | Optical transmission module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16931499A JP3950583B2 (en) | 1999-06-16 | 1999-06-16 | Optical transmission module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000357803A true JP2000357803A (en) | 2000-12-26 |
| JP3950583B2 JP3950583B2 (en) | 2007-08-01 |
Family
ID=15884248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16931499A Expired - Lifetime JP3950583B2 (en) | 1999-06-16 | 1999-06-16 | Optical transmission module |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3950583B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009016486A (en) * | 2007-07-03 | 2009-01-22 | Hitachi Information & Communication Engineering Ltd | Optical communication equipment |
| US7620332B2 (en) | 2004-05-14 | 2009-11-17 | Sumitomo Electric Industries, Ltd. | Optical receiving unit reducing cross talk between optical transmitting unit and optical transmitting/receiving apparatus installing the same |
| JP2017009727A (en) * | 2015-06-19 | 2017-01-12 | 矢崎総業株式会社 | Optical connector |
-
1999
- 1999-06-16 JP JP16931499A patent/JP3950583B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7620332B2 (en) | 2004-05-14 | 2009-11-17 | Sumitomo Electric Industries, Ltd. | Optical receiving unit reducing cross talk between optical transmitting unit and optical transmitting/receiving apparatus installing the same |
| JP2009016486A (en) * | 2007-07-03 | 2009-01-22 | Hitachi Information & Communication Engineering Ltd | Optical communication equipment |
| JP2017009727A (en) * | 2015-06-19 | 2017-01-12 | 矢崎総業株式会社 | Optical connector |
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| JP3950583B2 (en) | 2007-08-01 |
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