JPS639325A - Optical transmission circuit - Google Patents
Optical transmission circuitInfo
- Publication number
- JPS639325A JPS639325A JP61153456A JP15345686A JPS639325A JP S639325 A JPS639325 A JP S639325A JP 61153456 A JP61153456 A JP 61153456A JP 15345686 A JP15345686 A JP 15345686A JP S639325 A JPS639325 A JP S639325A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- resistor
- board
- resistors
- circuit board
- 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 16
- 230000005540 biological transmission Effects 0.000 title claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000004020 conductor Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 8
- 229910000640 Fe alloy Inorganic materials 0.000 abstract description 4
- 229910000990 Ni alloy Inorganic materials 0.000 abstract description 4
- 238000009966 trimming Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000007650 screen-printing Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野〕 本発明は光通信装置に利用する。[Detailed description of the invention] (Industrial application field) INDUSTRIAL APPLICATION This invention is utilized for an optical communication device.
本発明は光送信回路に関し、特に発光源の駆動電流を制
御する回路基板を有する光送信回路に関する。The present invention relates to an optical transmission circuit, and more particularly to an optical transmission circuit having a circuit board for controlling a driving current of a light emitting source.
本発明は、発光源とこれに駆動電流を与える駆動回路と
を結ぶ抵抗体を備えた回路基板を含む光送信回路におい
て、
抵抗体は回路基板上に形成された膜状の抵抗体であり、
これを分割して短絡する外部端子を設けることにより、
回路を小型化し、発光源の駆動電流の調整工数を少なく
し、（を頼性の向上を図るものである。The present invention provides an optical transmission circuit including a circuit board having a resistor connecting a light emitting source and a drive circuit that applies a drive current to the light transmitting circuit, wherein the resistor is a film-like resistor formed on the circuit board;
By dividing this and providing an external terminal to short-circuit it, the circuit can be made smaller, the number of steps needed to adjust the driving current of the light emitting source can be reduced, and reliability can be improved.
従来この種の光送信回路は、発光源への駆動電流を設定
する手段として、発光源から放出される光出力を検出し
ながら、複数個の抵抗体の中から所定の抵抗値を有する
ものを選択する方法、あるいは可変抵抗器を調整するこ
とにより駆動電流の最適化を計っていた。Conventionally, this type of optical transmitter circuit detects the light output emitted from the light source and selects a resistor having a predetermined resistance value from among a plurality of resistors as a means of setting the drive current to the light source. The drive current was optimized by selecting a variable resistor or by adjusting a variable resistor.
しかし、これらの従来方式では、回路が大型になること
、およびコスト高になる欠点がある。However, these conventional methods have the drawbacks of increased circuit size and high cost.
すなわち所定の光出力を得るために電流制限用の抵抗と
して、モールド金属被膜あるいは混成ＩＣ用のチップ抵
抗などを使用していた。この場合モールドあるいは金属
被膜抵抗体では、たとえば０．１Ｗ （ワット）クラス
の長さ４ｍｍ程度の小型で、定格電力の小さい素子を使
用しても、両端にはんだ付けを必要するから、実質的に
は長さ方向に１０ｆｆｌｆｆ１位の大きさになってしま
う。That is, in order to obtain a predetermined optical output, a molded metal film or a chip resistor for a hybrid IC has been used as a current limiting resistor. In this case, with a molded or metal film resistor, even if a small element with a length of about 4 mm and a low power rating is used in the 0.1W (Watt) class, soldering is required at both ends, so The size becomes about 10fflff1 in the length direction.
また、高さ方向でも、これら個別の抵抗体は１〜２ｍｍ
程度の径を有しており、電極間に配置した場合、回路基
板上掛なくとも同じ位の寸法が追加されることになる。Also, in the height direction, these individual resistors are 1 to 2 mm
If placed between the electrodes, it would add about the same size to the circuit board.
チップ抵抗の場合、抵抗設定時に数回の抵抗の付替作業
を要したり、交換用の端子等を別途に追加しなければな
らないので、実用的ではない。In the case of a chip resistor, it is not practical because it requires replacing the resistor several times when setting the resistor, and it requires additional terminals for replacement.
したがって、従来の個別抵抗体を交換して最適化を計る
方法では、小型化が困難である。Therefore, it is difficult to achieve miniaturization using the conventional method of replacing individual resistors for optimization.
また抵抗選定時に最適化を計るために数回の交換を要し
、そのたびごとにはんだを除去しなければならない。こ
のため調整工数が増大する。In addition, it is necessary to replace the resistor several times in order to optimize the resistor selection, and the solder must be removed each time. This increases the number of adjustment steps.
他に作業性が悪いこと、はんだを付着するさいの端子の
はがれによる信顛性の低下などの問題がある。Other problems include poor workability and reduced reliability due to peeling of the terminals when applying solder.
本発明は、これらの問題点を解決して、小型化でき、調
整工数が少なく信頼性のよい光送信回路を提供すること
を目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide an optical transmitter circuit that can be miniaturized, requires fewer adjustment steps, and has high reliability.
本発明は、発光源と、この発光源を駆動する駆動回路お
よびこの駆動回路の出力と上記発光源とを結ぶ抵抗体が
配置された回路基板とを備えた光送信回路において、
上記抵抗体は上記回路基板上に形成された膜状の抵抗体
であり、この抵抗体を分割する複数個の電極が設けられ
、この複数個の電極のそれぞれには外部端子が接続され
、この外部端子の任意のものを短絡接続する導体片を備
えたことを特徴とする。The present invention provides an optical transmission circuit including a light emitting source, a driving circuit for driving the light emitting source, and a circuit board on which a resistor connecting the output of the driving circuit and the light emitting source is arranged, wherein the resistor is It is a film-like resistor formed on the circuit board, and is provided with a plurality of electrodes that divide the resistor. An external terminal is connected to each of the plurality of electrodes, and any of the external terminals is connected to an external terminal. It is characterized by having a conductor piece for short-circuiting the two.
外部端子の外部端はほぼ直線状に配置されたことが好ま
しい。Preferably, the external ends of the external terminals are arranged substantially in a straight line.
導体片は金属の平板であることが好ましい。Preferably, the conductor piece is a flat metal plate.
抵抗体は回路基板上に形成された膜状のものであるから
小型になる。Since the resistor is a film formed on a circuit board, it is small.
また抵抗体の両種間は直列的に複数の部分に分割され、
それぞれの分割部より外部端子が引き出され、かつこれ
に接続する導体片を加工して任意の外部端子に接続でき
る。これにより発光体の駆動電流は容易に調整できる。In addition, both types of resistors are divided into multiple parts in series,
An external terminal is drawn out from each divided portion, and a conductor piece connected to this can be processed to connect to any external terminal. Thereby, the driving current of the light emitter can be easily adjusted.
次に本発明の実施例について図面を参照して説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の光送信回路の一実施例を示す構成図で
ある。第１図においてプリント基板あるいはセラミック
等からなる回路基板１０面上の取付端子２に発光源３が
接続される。取付端子２の一方は電源、論理回路、トラ
ンジスタ等の駆動回路で構成される駆動回路４に直結し
ている。FIG. 1 is a configuration diagram showing an embodiment of an optical transmitting circuit according to the present invention. In FIG. 1, a light emitting source 3 is connected to a mounting terminal 2 on the surface of a circuit board 10 made of a printed circuit board, ceramic, or the like. One of the mounting terminals 2 is directly connected to a drive circuit 4 comprised of drive circuits such as a power supply, a logic circuit, and a transistor.
他方は発光源３の駆動電流を制御する抵抗体に接続され
る。The other end is connected to a resistor that controls the drive current of the light emitting source 3.
ここに本発明の特徴とするところは、回路基板１上にス
クリーン印刷あるいはトリミング等で形成した所定の抵
抗値を有し、それぞれの両端に電極５を有する複数個か
らなる分割抵抗６が直列接続され、各電極５には鉄・ニ
ッケル合金等からなる引出し用の外部端子８が接続され
、さらに鉄・ニッケル合金等の平板金属からなり、各外
部端子８に電気的に接続される形状の穴があけられた電
気端子板９を備えたことにある。Here, the feature of the present invention is that a plurality of divided resistors 6 each having a predetermined resistance value formed by screen printing or trimming on the circuit board 1 and each having an electrode 5 at both ends are connected in series. Each electrode 5 is connected to an external terminal 8 for extraction made of iron/nickel alloy, etc., and a hole made of a flat metal such as iron/nickel alloy and shaped to be electrically connected to each external terminal 8 is connected to each electrode 5. This is because the electrical terminal board 9 is provided with a hole.
あらかじめ外部端子８に接続された電気端子板９は発光
源３からの出力光が所定の値に設定されるように切断し
て選定される。すなわち、第２図に示す電気端子板９Ａ
のように形状を成形することにより、分割抵抗６の全抵
抗値を切換えることができる。The electrical terminal board 9 connected in advance to the external terminal 8 is cut and selected so that the output light from the light emitting source 3 is set to a predetermined value. That is, the electrical terminal plate 9A shown in FIG.
The total resistance value of the divided resistor 6 can be changed by shaping the shape as shown in FIG.
第３図は第１図の抵抗部分の等価回路を示すものであり
、第４図は第２図の抵抗部分の等価回路を示すものであ
る。3 shows an equivalent circuit of the resistor section in FIG. 1, and FIG. 4 shows an equivalent circuit of the resistor section in FIG. 2.
すなわち光送信回路の発光源の駆動電流は、このように
抵抗値を規定することによって制御することができる。That is, the driving current of the light emitting source of the optical transmission circuit can be controlled by defining the resistance value in this way.
以上説明したように本実施例では、分割抵抗６を回路基
板上の面上にスクリーン印刷あるいはトリミング等で作
製した場合、１０μｍから数１００μｍと非常に薄型に
なり、長さ方向についても１００μｍ程度の精度で集積
化が可能になる。As explained above, in this embodiment, when the dividing resistor 6 is manufactured by screen printing or trimming on the surface of the circuit board, it becomes very thin, ranging from 10 μm to several hundred μm, and the length is also about 100 μm. Integration becomes possible with precision.
また最適な抵抗値を決める電極端子板９が１１００Ｊｊ
程度の厚さの平板金属で実施可能である。In addition, the electrode terminal plate 9 that determines the optimal resistance value is 1100Jj.
It is possible to use a flat metal plate with a thickness of about
価格面に関しては、スクリーン印刷あるいはトリミング
等で安価に製作可能である。In terms of price, it can be manufactured inexpensively by screen printing or trimming.
また、最適な抵抗値の設定は光出力を測定しながら、電
気端子板を切断すればよいので工数は少なくてすむ。Further, since the optimum resistance value can be set by cutting the electrical terminal board while measuring the optical output, the number of man-hours can be reduced.
加えるに、作業の容易性、信頼性の確保がなされる。In addition, ease of work and reliability are ensured.
本発明における電源供給端子、収納ケースなどは通常の
構成のものを利用できる。The power supply terminal, storage case, etc. in the present invention can be of a normal configuration.
以上説明したように、本発明によれば、小型化でき、抵
抗値の調整工数が少なく、信頼性のよい光送信回路が安
価に実現できる効果がある。As described above, according to the present invention, it is possible to realize an optical transmitting circuit which can be miniaturized, requires less man-hours for adjusting the resistance value, and has good reliability at a low cost.
第１図は本発明の一実施例の構成図。
第２図は上記実施例の実施形態図。
第３図は第１図の抵抗部分の等価回路図。
第４図は第２図の抵抗部分の等価回路図。
第５図は従来例の構成図。
１・・・回路基板、２・・・取付端子、３・・・発光源
、４・・・駆動回路、５・・・電橋、６・・・分割抵抗
、７・・・分割抵抗の終端部、８・・・外部端子、９・
・・電気端子板、９Ａ・・・成形された電気端子板、１
０・・・モールド金属被膜、１１・・・回路基板上の取
付端子。FIG. 1 is a configuration diagram of an embodiment of the present invention. FIG. 2 is an embodiment diagram of the above embodiment. FIG. 3 is an equivalent circuit diagram of the resistor portion of FIG. 1. FIG. 4 is an equivalent circuit diagram of the resistor portion of FIG. 2. FIG. 5 is a configuration diagram of a conventional example. DESCRIPTION OF SYMBOLS 1... Circuit board, 2... Mounting terminal, 3... Light emitting source, 4... Drive circuit, 5... Electric bridge, 6... Dividing resistor, 7... Termination of dividing resistor Part, 8... External terminal, 9.
...Electrical terminal board, 9A...Molded electrical terminal board, 1
0...Mold metal coating, 11...Mounting terminal on the circuit board.
Claims (3)
路の出力と上記発光源とを結ぶ抵抗体（６）が配置され
た回路基板と を備えた光送信回路において、 上記抵抗体は上記回路基板上に形成された膜状の抵抗体
であり、この抵抗体を分割する複数個の電極（５）が設
けられ、 この複数個の電極のそれぞれには外部端子（８）が接続
され、 上記外部端子の任意のものを短絡接続する導体片（９）
を備えた ことを特徴とする光送信回路。(1) A light source comprising a light emitting source (3), a driving circuit (4) for driving the light emitting source, and a circuit board on which a resistor (6) connecting the output of the driving circuit and the light emitting source is arranged. In the transmission circuit, the resistor is a film-like resistor formed on the circuit board, and a plurality of electrodes (5) are provided to divide the resistor, and each of the plurality of electrodes has a A conductor piece (9) to which the external terminal (8) is connected and which short-circuits any of the above external terminals.
An optical transmission circuit characterized by comprising:
請求の範囲第（１）項に記載の光送信回路。(2) The optical transmitter circuit according to claim (1), wherein the external ends of the external terminals are arranged substantially in a straight line.
）項および第（２）項に記載の光送信回路。(3) The conductor piece is a flat metal plate.
) and (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61153456A JPH0716177B2 (en) | 1986-06-30 | 1986-06-30 | Optical transmitter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61153456A JPH0716177B2 (en) | 1986-06-30 | 1986-06-30 | Optical transmitter circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS639325A true JPS639325A (en) | 1988-01-16 |
| JPH0716177B2 JPH0716177B2 (en) | 1995-02-22 |
Family
ID=15562953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61153456A Expired - Lifetime JPH0716177B2 (en) | 1986-06-30 | 1986-06-30 | Optical transmitter circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716177B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528408A (en) * | 1994-10-12 | 1996-06-18 | Methode Electronics, Inc. | Small footprint optoelectronic transceiver with laser |
| EP3295772B1 (en) * | 2015-05-08 | 2023-08-23 | ZKW Group GmbH | Method of balancing branch-currents in parallel connected branches of a lighting device for vehicles |
-
1986
- 1986-06-30 JP JP61153456A patent/JPH0716177B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528408A (en) * | 1994-10-12 | 1996-06-18 | Methode Electronics, Inc. | Small footprint optoelectronic transceiver with laser |
| EP3295772B1 (en) * | 2015-05-08 | 2023-08-23 | ZKW Group GmbH | Method of balancing branch-currents in parallel connected branches of a lighting device for vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0716177B2 (en) | 1995-02-22 |
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