JPH02308576A - Photocoupler - Google Patents
PhotocouplerInfo
- Publication number
- JPH02308576A JPH02308576A JP1130929A JP13092989A JPH02308576A JP H02308576 A JPH02308576 A JP H02308576A JP 1130929 A JP1130929 A JP 1130929A JP 13092989 A JP13092989 A JP 13092989A JP H02308576 A JPH02308576 A JP H02308576A
- Authority
- JP
- Japan
- Prior art keywords
- light
- photodiode
- photodiodes
- receiving element
- amount
- 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
Links
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、発光素子と受光素子との間の光結合の効率を
向上させるフォトカプラの構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a photocoupler structure that improves the efficiency of optical coupling between a light emitting element and a light receiving element.
（従来の技術）
７オトカプラの受光素子であるフォトダイオードはその
感度を向上させるために、複数個を直列に接続して使用
することがあるが、従来その個々のフォトダイオードの
面積は同一であり、発光素子（例えばＬＥＤ ）からの
距離の遠近による強度分布は考慮されていなかった。こ
れは受光素子全体の面積が小さく、個々のフォトダイオ
ードの入射光は概ね均一であると想定されるからである
。(Prior art) A plurality of photodiodes, which are the light-receiving elements of a 7-otocoupler, are sometimes connected in series to improve their sensitivity, but conventionally the area of each photodiode is the same. However, the intensity distribution depending on the distance from the light emitting element (for example, LED) was not considered. This is because the area of the entire light receiving element is small, and it is assumed that the incident light on each photodiode is generally uniform.
受光素子に直接入射しなかった光を利用し光結合の効率
を向上する方法としては、発光素子と受光素子との周囲
を白色の樹脂でモールドし、受光素子に直接入射しなか
った光を乱反射させて、できるだけ多くの光を受光素子
に入射させることが行われていた。A method of improving the efficiency of optical coupling by using light that did not directly enter the light receiving element is to mold the area around the light emitting element and the light receiving element with white resin, and diffusely reflect the light that did not directly enter the light receiving element. The conventional technique is to allow as much light as possible to enter the light receiving element.
（発明が解決しようとする課題）
ＬＥＤの光は、狭い面積から放射線状に発光するため、
フォトダイオードの個々の面積が同一のとき、それぞれ
の光量はＬＥＤからの距離によって異なるから、フォト
ダイオードが直列に接続されていると、出力が小さいフ
ォトダイオードによって受光素子全体の出力が制限され
、エネルギーの損失が生じていた。これはフォトダイオ
ードの数が多い程顕著になる。前述の白色の樹脂でモー
ルドし、乱反射を利用することによっても解決されない
。(Problem to be solved by the invention) Since LED light emits radiation from a narrow area,
When the area of each photodiode is the same, the amount of light from each photodiode differs depending on the distance from the LED. Therefore, when photodiodes are connected in series, the output of the entire light receiving element is limited by the photodiode with a small output, and the energy losses had occurred. This becomes more noticeable as the number of photodiodes increases. The problem cannot be solved even by molding with the above-mentioned white resin and utilizing diffused reflection.
（課題を解決するための手段）
本発明においては、前述の欠点を除くため、発光素子か
らの距離に応じて個々の受光素子の受光量を均一化させ
た。(Means for Solving the Problems) In the present invention, in order to eliminate the above-mentioned drawbacks, the amount of light received by each light receiving element is made uniform according to the distance from the light emitting element.
（作用）
発光素子からの距離の大きい受光素子の面積を大きく、
近い受光素子の面積を小さくすることにより、あるいは
反射板を利用して各受光素子の光電流は均一化される。(Function) Increase the area of the light-receiving element that is located at a large distance from the light-emitting element.
The photocurrent of each light receiving element can be made uniform by reducing the area of nearby light receiving elements or by using a reflector.
（実施例）
発光素子としてはＬＥＤ、ＥＬ等が使用され、受光素子
としてはフォトダイオード、フォトトランジスタ等が使
用されるが、以下の実施例は、発光素子としてはＬＥＤ
、受光素子としては複数のフォトダイオードを使用した
場合について説明する。(Example) LEDs, ELs, etc. are used as light-emitting elements, and photodiodes, phototransistors, etc. are used as light-receiving elements, but in the following examples, LEDs are used as light-emitting elements.
, a case where a plurality of photodiodes are used as the light receiving element will be explained.
第１図は、それぞれ面積の異なるフォトダイオード１，
２．８及びこれらと対称のフォトダイオード１−１．１
−２．１−８等からなるフォトダイオードアレイ１０の
対称軸ｙ軸のｙ＝Ｑの点に垂直にｔだけ離れた位置ＡＶ
ＣＬＥＤがある状態を示す説明図である。対称軸をｙ軸
、これと直角にフォトダイオードアレイ１０の中心を通
る軸をＸ軸とする。計算を簡単にするために、ＬＥＤを
点光源とすると、斜線部で示されるフォトダイオード２
の光量は、幅がｘｌからｘ２までであり、長さが−Ｙか
らＹまでであるとすると、この範囲の受光量ｌは次の（
１）式によって求められる。Figure 1 shows photodiodes 1, each having a different area.
2.8 and photodiodes 1-1.1 symmetrical to these
A position AV perpendicular to the point y=Q on the symmetry axis y axis of the photodiode array 10 consisting of -2.1-8 etc.
It is an explanatory view showing a state where a CLED is present. The axis of symmetry is the y-axis, and the axis passing through the center of the photodiode array 10 at right angles to this is the x-axis. To simplify calculations, if the LED is a point light source, the photodiode 2 shown in the shaded area
Assuming that the width is from xl to x2 and the length is from -Y to Y, the amount of light received in this range l is as follows (
1) It is determined by the formula.
ただし、Ａ、Ｂは定数であり、Ｂは乱反射によってフォ
トダイオード２に入射された光に関するものである。乱
反射によってフォトダイオードに入射した光は、フォト
ダイオードの全表面にわたり略々均一と見なされる。However, A and B are constants, and B relates to light incident on the photodiode 2 due to diffuse reflection. Light incident on the photodiode due to diffuse reflection is considered to be substantially uniform over the entire surface of the photodiode.
個々の７肴トダイオードに対し、（１）式で求められる
受光量！が等しくなるように１個々のフォトダイオード
のｘｌ及びｘ２を決定すれば、各受光素子の受光量が均
一化し、延いては光電流も均一化し、受光素子内でエネ
ルギーの損失を生ずることがない。フォトダイオードと
しては単結晶及び多結晶シリコンが望ましいが、容易に
集積化が可能な非晶質シリコン系のフォトダイオードを
用いることもできる。The amount of light received by each of the seven diode diodes is determined by formula (1)! If xl and x2 of each photodiode are determined such that . Single-crystal and polycrystalline silicon are desirable as photodiodes, but amorphous silicon-based photodiodes that can be easily integrated can also be used.
第２図は発光素子と受光素子とが対向しておらず、反射
を利用する場合のものである。逐次に幅を広くしたフォ
トダイオード２−１ 、２−２ 、２−１３ 。FIG. 2 shows a case where the light emitting element and the light receiving element are not opposed to each other and reflection is used. Photodiodes 2-1, 2-2, 2-13 whose widths are sequentially increased.
・・・等よりなる７オトダイオードアレイ２０の中心線
をＸ軸とし、ｘ ＝ ００点Ａ−１にＬＥＤが置かれ、
Ｘ軸に垂直にｙ軸があり、これらに垂直に距離がｔ１離
れている場所に平行な反射板６が置かれている。この場
合、斜線で示されているフォトダイオード２−８の受光
量は、その幅がｘ８からｘａｔでであり、長さが−Ｙ１
からＹ！までであるとすると、この範囲の受光量！ｌは
次の（２）式によって求められる。..., etc. The center line of the 7-otodiode array 20 is set as the X axis, and the LED is placed at x = 00 point A-1,
There is a y-axis perpendicular to the X-axis, and a parallel reflecting plate 6 is placed perpendicularly to the y-axis at a distance t1. In this case, the amount of light received by the photodiode 2-8 indicated by diagonal lines has a width of x8 to xat and a length of -Y1.
From Y! If the amount of light received is within this range! l is determined by the following equation (2).
・・・（２］
九だしＡｌ、Ｂｌは定数であり、Ｂ１は前述の（１）式
と同様に乱反射によってフォトダイオード２−８に入射
された光に関するものである。この場合も個々のフォト
ダイオードについてｘ３及びｘ４を決定すれば、各受光
素子の受光量を均一化することができる。...(2) In the equation, Al and Bl are constants, and B1 is related to the light incident on the photodiode 2-8 due to diffuse reflection, as in the above equation (1).In this case, the individual photo By determining x3 and x4 for the diodes, it is possible to equalize the amount of light received by each light receiving element.
第１図、第２図はともに、それぞれのフォトダイオード
の受光面の形状が長方形の場合を示したが、これ以外の
形状のものについても、各受光素子の受光量が均一にな
るように設計することができる。また、第２図のように
反射板を利用するときは、反射面を曲面にして又は曲面
と併用して、各受光素子の受光量を均一化することがで
きる。Although Figures 1 and 2 both show the case where the light-receiving surface of each photodiode is rectangular in shape, other shapes are also designed so that the amount of light received by each light-receiving element is uniform. can do. Further, when a reflecting plate is used as shown in FIG. 2, the amount of light received by each light-receiving element can be made uniform by making the reflecting surface a curved surface or by using it in combination with a curved surface.
さらに面光源の場合にも応用できる。Furthermore, it can be applied to a surface light source.
（発明の効果）′
本発明によるときは、複数の受光素子のそれぞれの受光
量が均一化されるから、発光素子と受光素子との光結合
の効率を上げることができ、より高出力の７オトカブラ
を提供することができる。(Effects of the Invention) According to the present invention, since the amount of light received by each of the plurality of light receiving elements is equalized, the efficiency of optical coupling between the light emitting element and the light receiving element can be increased, and a higher output 7 We can provide Otokabura.
【図面の簡単な説明】
第１図及び第２図は本発明の詳細な説明図である。
１ 、２ 、８ 、１−１．１−２．１−８・・・フォ
トダイオード、２−１．２−２．２−３．２−４，２−
５．２−６・・・フォトダイオード、５・・・反射板、
１０．２０・・・フォトダイオードアレイ、Ａ、Ａ−１
−ＬＥＤの位置、ｔ・ ＬＥＤと点Ｘ＝Ｏとの距離、ｔ
ｌ・・・ＬＥＤと反射板との距離。
茜
・事 ！ ２
輩
Ｉ！１２ 図BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are detailed illustrations of the present invention. 1, 2, 8, 1-1.1-2.1-8...photodiode, 2-1.2-2.2-3.2-4,2-
5.2-6...Photodiode, 5...Reflector,
10.20...Photodiode array, A, A-1
- LED position, t・Distance between LED and point X=O, t
l...Distance between the LED and the reflector. Akane・Things! 2 Senior I! 12 Figure
Claims (1)
りなり、各受光素子の受光量は発光素子からの距離に関
係なく均一化されていることを特徴とするフォトカプラ1. A photocoupler consisting of a light-emitting element and a plurality of light-receiving elements connected in series, the amount of light received by each light-receiving element being equalized regardless of the distance from the light-emitting element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1130929A JPH02308576A (en) | 1989-05-23 | 1989-05-23 | Photocoupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1130929A JPH02308576A (en) | 1989-05-23 | 1989-05-23 | Photocoupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02308576A true JPH02308576A (en) | 1990-12-21 |
Family
ID=15046020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1130929A Pending JPH02308576A (en) | 1989-05-23 | 1989-05-23 | Photocoupler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02308576A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06163977A (en) * | 1992-11-18 | 1994-06-10 | Nec Corp | Photocoupler |
| JP2010258165A (en) * | 2009-04-23 | 2010-11-11 | Omron Corp | Optical coupler |
-
1989
- 1989-05-23 JP JP1130929A patent/JPH02308576A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06163977A (en) * | 1992-11-18 | 1994-06-10 | Nec Corp | Photocoupler |
| JP2010258165A (en) * | 2009-04-23 | 2010-11-11 | Omron Corp | Optical coupler |
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