JPH0427173A - Light emitting diode - Google Patents
Light emitting diodeInfo
- Publication number
- JPH0427173A JPH0427173A JP2133514A JP13351490A JPH0427173A JP H0427173 A JPH0427173 A JP H0427173A JP 2133514 A JP2133514 A JP 2133514A JP 13351490 A JP13351490 A JP 13351490A JP H0427173 A JPH0427173 A JP H0427173A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- axis
- light
- emitting diode
- concave reflective
- 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
- 230000005855 radiation Effects 0.000 claims description 19
- 239000000463 material Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000005469 synchrotron radiation Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Led Device Packages (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、発光素子が発する光を凹面状反射面で反射し
た後に外部に放射する発光ダイオードに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a light emitting diode that emits light from a light emitting element after reflecting it on a concave reflecting surface and then radiating it to the outside.
道路表示板のように高所に設置され、遠方より視認され
るデイスプレィ等に使用する光源は、水平方向に広い視
認角を有するものが望ましい、第５図はかかるデイスプ
レィ等に使用される従来の発光ダイオードの概略正面図
、第６図はその発光ダイオードのＣ−Ｃ矢視概略断面図
、第７図はその発光ダイオードのＤ−Ｄ矢視概略断面図
である。It is desirable for light sources used in displays that are installed at high places and visible from a distance, such as road signboards, to have a wide viewing angle in the horizontal direction. Figure 5 shows a conventional light source used in such displays. FIG. 6 is a schematic front view of the light emitting diode, FIG. 6 is a schematic sectional view taken along line C-C of the light emitting diode, and FIG. 7 is a schematic sectional view taken along line DD of the light emitting diode.
第５図乃至第７図において、５２ａ、５２ｂは発光素子
、５４ａ、５４ｂ、５６はリード７Ｌ／−ム、５８はワ
イヤ、６０は光透過性材料、６２は凹面状反射面、６４
は放射面である。尚、Ｚ軸は凹面状反射面６２の中心軸
方向、Ｘ軸は凹面状反射面６２の端縁を含む平面におけ
る２軸に垂直な水平方向、ｙ軸は２軸及びＸ軸に直角な
垂直方向である。5 to 7, 52a, 52b are light emitting elements, 54a, 54b, 56 are leads 7L/-, 58 is a wire, 60 is a light-transmitting material, 62 is a concave reflective surface, 64
is a radiating surface. Note that the Z axis is the central axis direction of the concave reflective surface 62, the X axis is a horizontal direction perpendicular to two axes in the plane including the edges of the concave reflective surface 62, and the y axis is a vertical direction perpendicular to the two axes and the X axis. It is the direction.
第５図乃至第７図に示す従来の発光ダイオードは、Ｘ軸
に垂直な平面による凹面状反射面６２の切断面がＸ軸上
に長径、ｙ軸上に短径を有する略楕円面形状となるよう
に形成され、また発光素子５２ａ、５２ｂはＸ軸上に配
置されている。かかる発光ダイオードは、発光素子５２
ａ、５２ｂによって発せられ、凹面状反射面６２により
反射された光が、Ｘ軸方向（水平方向）には広い配光特
性を有し、ｙ軸方向（垂直方向）には狭い配光特性を有
する。In the conventional light emitting diode shown in FIGS. 5 to 7, the cut surface of the concave reflective surface 62 taken by a plane perpendicular to the X-axis has a substantially ellipsoidal shape with a major axis on the X-axis and a minor axis on the y-axis. The light emitting elements 52a and 52b are arranged on the X axis. Such a light emitting diode includes a light emitting element 52
a, 52b and reflected by the concave reflective surface 62 has a wide light distribution characteristic in the X-axis direction (horizontal direction) and a narrow light distribution characteristic in the y-axis direction (vertical direction). have
ところで、たとえばデイスプレィの使用場所によっては
、水平方向の配光だけをさらに広げたい場合がある。こ
の場合には、凹面状反射面６２はＸ軸に垂直な平面によ
る切断面において長径の短径に対する比の値がさらに大
きい略楕円面形状の凹面状反射面に形成されなければな
らない。しかし、従来の発光ダイオードでは、水平方向
の配光特性だけを広くしようとしても、水平方向だけで
なく、垂直方向の配光特性も広がってしまう。このよう
な発光ダイオードを、特に屋外に設置されたデイスプレ
ィ等に使用した場合、水平方向の配光は広くなるが、前
記のように垂直方向の配光も広がることに起因して必要
な光度が得られないという問題点があった。By the way, depending on the location where the display is used, for example, there may be cases where it is desired to further expand only the light distribution in the horizontal direction. In this case, the concave reflective surface 62 must be formed into a substantially elliptical concave reflective surface in which the ratio of the major axis to the minor axis is larger in a cross section taken by a plane perpendicular to the X-axis. However, in conventional light emitting diodes, even if an attempt is made to widen only the light distribution characteristics in the horizontal direction, the light distribution characteristics not only in the horizontal direction but also in the vertical direction will become wider. When such light emitting diodes are used, especially in displays installed outdoors, the light distribution in the horizontal direction becomes wider, but as mentioned above, the light distribution in the vertical direction also becomes wider, which reduces the necessary luminous intensity. There was a problem that I couldn't get it.
本発明は上記事情に基づいてなされたものであり、光度
を大幅に低下させることなく、特定の方向については極
めて広い配光特性を有する発光ダイオードを提供するこ
とを目的とするものである。The present invention has been made based on the above circumstances, and an object of the present invention is to provide a light emitting diode that has extremely wide light distribution characteristics in a specific direction without significantly reducing luminous intensity.
上記の目的を達成するための本発明は、発光素子と、該
発光素子に電力を供給するリード部と、前記発光素子の
発光面に対向して設けられた凹面状反射面と、前記発光
素子が発し前記凹面状反射面により反射された光を外部
に放射する放射面とを有する発光ダイオードにおいて、
前記放射面が凸柱面状に形成されていることを特徴とす
るものである。To achieve the above object, the present invention includes a light emitting element, a lead portion for supplying power to the light emitting element, a concave reflective surface provided opposite to a light emitting surface of the light emitting element, and a light emitting element. A light emitting diode having a radiation surface that emits light emitted by the concave reflective surface and reflected by the concave reflective surface to the outside,
The radiation surface is characterized in that it is formed in a convex column shape.
そして、前記凹面状反射面は前記凹面状反射面の中心軸
に垂直な面で切り取られた切断面が楕円形状であり、前
記凸柱面状の放射面は前記切断面の長軸と平行となるよ
うに形成してもよい。The concave reflective surface has an elliptical cut surface that is perpendicular to the central axis of the concave reflective surface, and the convex cylindrical radiation surface is parallel to the long axis of the cut surface. It may be formed as follows.
また、前記発光素子を２個設け、前記凸柱面状の放射面
に平行な方向に前記２個の発光素子を配列してもよい。Alternatively, two light emitting elements may be provided and the two light emitting elements may be arranged in a direction parallel to the convex cylindrical radiation surface.
（作用〕
本発明は前記の構成によって、放射面を凸柱面状に形成
したことにより、発光素子が発して凹面状反射面で反射
された光のうち、たとえば水平方向に反射された光はそ
のまま外部に放射し、垂直方向に反射された光の配光を
狭くすることができる。(Function) According to the present invention, the radiation surface is formed into a convex cylindrical shape according to the above configuration, so that among the light emitted by the light emitting element and reflected by the concave reflective surface, for example, the light reflected in the horizontal direction is It is possible to radiate the light directly to the outside and narrow the distribution of the light reflected in the vertical direction.
そして、凹面状反射面をその中心輪番こ垂直な面で切り
取った切断面が楕円形状となるように形成し、放射面を
前記切断面の長軸と平行に形成することにより、長軸方
向の放射光の配光を広げることができる。Then, the concave reflective surface is formed so that the cut surface is elliptical, and the radiation surface is formed parallel to the long axis of the cut surface. The light distribution of synchrotron radiation can be expanded.
また、２個の発光素子を凸柱面状の放射面に平行な方向
に配列することにより、さらに放射光の配光を広げるこ
とができるとともに、放射光の強度を高めることができ
る。Further, by arranging two light emitting elements in a direction parallel to the convex cylindrical radiation surface, the distribution of the emitted light can be further expanded and the intensity of the emitted light can be increased.
以下に本発明の一実施例を第１図乃至第３図を参照して
説明する。第１図は本発明の発光ダイオードの概略正面
図、第２図はその発光ダイオードのＡ−Ａ矢視概略断面
図、第３図はその発光ダイオードのＢ−Ｂ矢視概略断面
図である。第１図乃至第３図に示す発光ダイオードは、
発光素子２ ａ。An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a schematic front view of a light emitting diode of the present invention, FIG. 2 is a schematic sectional view of the light emitting diode taken along the line AA, and FIG. 3 is a schematic sectional view of the light emitting diode taken along the line BB. The light emitting diode shown in FIGS. 1 to 3 is
Light emitting element 2 a.
２ｂと、リードフレーム４ａ、４ｂ、６と、ワイヤ８と
、光透過性材料１０と、凹面状反射面１２と、放射面１
４とから構成される。尚、Ｘ軸は凹面状反射面１２の中
心軸方向、Ｘ軸は凹面状反射面１２の端縁を含む平面に
おけるＸ軸に垂直な方向、ｙ軸は凹面状反射面１２の端
縁を含む平面における２軸及びＸ軸に垂直な方向である
。2b, lead frames 4a, 4b, 6, wire 8, light-transmissive material 10, concave reflective surface 12, and radiation surface 1
It consists of 4. Note that the X-axis is the direction of the central axis of the concave reflective surface 12, the X-axis is a direction perpendicular to the X-axis in a plane that includes the edges of the concave reflective surface 12, and the y-axis includes the edges of the concave reflective surface 12. This is a direction perpendicular to the two axes in the plane and the X axis.
発光素子２ａ、２ｂはそれぞれリードフレーム４ａ、４
ｂ上にマウントされ、またワイヤ８．８によってリード
フレーム４ｂ、６と電気的に接続されている。そして、
発光素子２ａ、２ｂは２軸に対して対称なＸ軸上の位置
に配置されている。The light emitting elements 2a and 2b are connected to lead frames 4a and 4, respectively.
b and is electrically connected to the lead frames 4b, 6 by wires 8.8. and,
The light emitting elements 2a and 2b are arranged at positions on the X axis that are symmetrical about the two axes.
発光素子２ａ、２ｂ、リードフレーム４ａ、４ｂ。Light emitting elements 2a, 2b, lead frames 4a, 4b.
６の先端部及びワイヤ８は光透過性材料１０により一体
的に封止されている。発光素子２ａ、２ｂの発光面に対
向する側に凹面状反射面１２が形成され、発光素子２ａ
、２ｂの背面側に放射面１４が形成されている。凹面状
反射面１２は、光透過性材料１０の一方の面を鍍金や金
属蒸着等によって鏡面加工したものであり、鏡面加工の
際には３本のリードフレーム４ａ、４ｂ、６間の短絡を
防止するためにリードフレーム４ａ、４ｂ、６には絶縁
を施す必要がある。6 and the wire 8 are integrally sealed with a light-transmissive material 10. A concave reflective surface 12 is formed on the side facing the light emitting surfaces of the light emitting elements 2a and 2b, and the light emitting element 2a
, 2b has a radiation surface 14 formed on the back side thereof. The concave reflective surface 12 is made by mirror-finishing one surface of the light-transmitting material 10 by plating, metal vapor deposition, etc., and prevents short circuits between the three lead frames 4a, 4b, and 6 during mirror-finishing. To prevent this, it is necessary to insulate the lead frames 4a, 4b, and 6.
凹面状反射面１２は、水平方向（Ｘ軸方向）の配光を広
くするために、ｚ軸に垂直な平面による切断面がＸ軸上
に長径、ｙ軸上に短径を有する略楕円形状となるように
形成されている。ところで、垂直方向（ｙ軸方向）の配
光を広げることなく、水平方向の配光だけをさらに広げ
るには、凹面状反射面はｚ軸に垂直な切断面において長
径の短径に対する比の値がさらに大きい略楕円形状に形
成する必要がある。しかし、このようにして水平方向の
配光を広げると垂直方向の配光も広がり、特に水平方向
の大きな角度方向における垂直方向の配光が広がってし
まう、そこで、本実施例の凹面状反射面１２においては
、反射光の水平方向の配光は所望のものとなるように、
しかし垂直方向の配光は所望のものより広がるように形
成している。In order to widen the light distribution in the horizontal direction (X-axis direction), the concave reflective surface 12 has a cross section taken by a plane perpendicular to the z-axis and has a substantially elliptical shape with a major axis on the X-axis and a minor axis on the y-axis. It is formed so that. By the way, in order to further widen only the light distribution in the horizontal direction without expanding the light distribution in the vertical direction (y-axis direction), the concave reflective surface should have a ratio of the major axis to the minor axis in the cut plane perpendicular to the z-axis. It is necessary to form it into a substantially elliptical shape with a larger value. However, if the horizontal light distribution is widened in this way, the vertical light distribution will also be widened, especially in the direction of a large horizontal angle. Therefore, the concave reflective surface of this example 12, so that the horizontal direction distribution of the reflected light is as desired.
However, the vertical light distribution is made wider than desired.
また、放射面１４は、第２図及び第３図に示すように、
その凸面が凹面状反射面１２の前記切断面の長軸と平行
な凸柱面になるように形成されている。In addition, the radiation surface 14, as shown in FIGS. 2 and 3,
The convex surface is formed to be a convex cylindrical surface parallel to the long axis of the cut surface of the concave reflective surface 12.
上記のように構成された発光ダイオードにおいては、発
光素子２ａ、’ｌｂが発した光は凹面状反射面１２で反
射される。この反射光の水平方向の配光は所望の広さの
特性を有するが、垂直方向の配光は所望のものより広い
特性を有する。このような配光特性を有する反射光が放
射面１４に入射すると、放射面１４はその凸面が凹面状
反射面の前記切断面の長軸に対して平行となる凸柱面に
形成されているので、水平方向の放射光はそのままの角
度で放射面１４から外部に放射されるが、垂直方向の放
射光はｚ−ｘ平面に向かって屈折する。In the light emitting diode configured as described above, the light emitted by the light emitting elements 2 a and 'lb is reflected by the concave reflecting surface 12 . The horizontal light distribution of this reflected light has a desired width characteristic, but the vertical light distribution has a wider characteristic than the desired width. When reflected light having such light distribution characteristics enters the radiation surface 14, the radiation surface 14 is formed into a convex cylindrical surface whose convex surface is parallel to the long axis of the cut surface of the concave reflective surface. Therefore, the horizontally emitted light is radiated outward from the emitting surface 14 at the same angle, but the vertically emitted light is refracted toward the z-x plane.
したがって、本実施例の発光ダイオードにおいては、凹
面状反射面１２によって水平方向の配光を広げるために
必要以上に広がった垂直方向の配光を、放射面１４によ
って狭くして垂直方向においても、所望の配光を得るこ
とができる。また、本実施例では水平方向の配光を広げ
たが、垂直方向の配光を狭くしたことにより、従来のも
のに比べて光度の大幅な低下を防止することができる。Therefore, in the light emitting diode of this embodiment, the light distribution in the vertical direction, which has been expanded more than necessary by the concave reflective surface 12 to widen the light distribution in the horizontal direction, is narrowed by the radiation surface 14, and even in the vertical direction. A desired light distribution can be obtained. Further, although the light distribution in the horizontal direction is widened in this embodiment, the light distribution in the vertical direction is narrowed, thereby making it possible to prevent a significant decrease in luminous intensity compared to the conventional one.
尚、上記の実施例においては、横断面が２軸に対して対
称な形状の凸柱面を放射面として用いた場合について説
明したが、本発明はこれに限定されるものではなく、第
４図に示すように凸柱面の横断面はｚ軸に対して対称な
形状でなくてもよい。In the above embodiment, a convex cylindrical surface whose cross section is symmetrical with respect to two axes is used as a radiation surface, but the present invention is not limited to this, and the fourth embodiment As shown in the figure, the cross section of the convex cylindrical surface does not have to have a symmetrical shape with respect to the z-axis.
かかる発光ダイオードでは、上下方向の配光を非対称に
することができ、たとえば垂直方向の配光特性について
は上方向にはほとんど放射せず、光度のピークを中心軸
方向とし、下方向には広い配光とすることが可能となる
。In such a light emitting diode, the light distribution in the vertical direction can be made asymmetrical. For example, in the vertical direction, light distribution characteristics are such that almost no light is emitted upwards, the peak luminous intensity is in the direction of the central axis, and the light intensity is wide in the downward direction. It becomes possible to set the light distribution.
また、上記の実施例においては、凹面状反射面をｚ−ｘ
平面に対して対称な形状になるように形成した場合につ
いて説明したが、本発明はこれに限定されるものではな
く、凹面状反射面を２−ｘ平面に対して非対称な形状に
なるように形成してもよい。Further, in the above embodiment, the concave reflective surface is z−x
Although a case has been described in which the concave reflective surface is formed to have a shape that is symmetrical with respect to the plane, the present invention is not limited to this. may be formed.
更に、上記の実施例においては、発光素子を一２軸に対
して対称なＸ軸上の位置に２個配置した場合について説
明したが、本発明はこれに限定されるものではなく、発
光素子はｚ軸に対して対称なＸ軸上の位置に配置されな
くてもよく、また、発光素子を１個又は３個以上用いて
もよい。Further, in the above embodiment, a case was explained in which two light emitting elements were arranged at positions on the X axis symmetrical with respect to the 12 axes, but the present invention is not limited to this, and the light emitting elements does not need to be arranged at a position on the X-axis that is symmetrical to the Z-axis, and one or more light-emitting elements may be used.
（発明の効果〕
以上説明したように本発明によれば、放射面を凸柱面状
に形成したことにより、凹面状反射面による反射光のう
ち、特定の方向たとえば水平方向の配光特性を広くして
かつ垂直方向の配光特性を狭くすることができ、道路表
示板等のデイスプレィ用の光源に好適な発光ダイオード
を提供することができる。(Effects of the Invention) As explained above, according to the present invention, by forming the radiation surface into a convex cylindrical shape, the light distribution characteristics in a specific direction, for example, the horizontal direction, of the light reflected by the concave reflection surface can be adjusted. It is possible to provide a light emitting diode which can be made wide and narrow in vertical light distribution characteristics, and is suitable for a light source for displays such as road signboards.
第１図は本発明の一実施例である発光ダイオードの概略
正面図、第２図はその発光ダイオードのＡ−Ａ矢視概略
断面図、第３図はその発光ダイオードのＢ−Ｂ矢視概略
断面図、第４図は本実施例の変形例である発光ダイオー
ドの概略右側断面図、第５図は従来の発光ダイオードの
概略正面図、第６図はその発光ダイオードのＣ−Ｃ矢視
概略断面図、第７図はその発光ダイオードのＤ−Ｄ矢視
概略断面図である。
２ａ、２ｂ・・・発光素子、
４ａ、４ｂ、６・・・ リードフレーム、８・・・ワイ
ヤ、１０・・・光透過性材料、１２・・・凹面状反射面
、１４・・・放射面。
出願人 岩 崎 電 気 株式会社
代理人 弁理士 半 １）昌 実
弟１図
］“
二Ｂ
第２図
第３図
↑
第５図
第６図
２ａ
２ｂ
第７図FIG. 1 is a schematic front view of a light-emitting diode that is an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the light-emitting diode taken along the line A-A, and FIG. 3 is a schematic cross-sectional view of the light-emitting diode taken along the line B-B. 4 is a schematic right side sectional view of a light emitting diode that is a modification of this embodiment, FIG. 5 is a schematic front view of a conventional light emitting diode, and FIG. 6 is a schematic view of the light emitting diode taken along the line C-C. A cross-sectional view, FIG. 7 is a schematic cross-sectional view taken along the line D-D of the light emitting diode. 2a, 2b... Light emitting element, 4a, 4b, 6... Lead frame, 8... Wire, 10... Light transmitting material, 12... Concave reflective surface, 14... Emitting surface . Applicant Iwasaki Electric Co., Ltd. Agent Patent Attorney Half 1) Masa Younger Brother 1] “2B Figure 2 Figure 3 ↑ Figure 5 Figure 6 2a 2b Figure 7
Claims (3)
部と、前記発光素子の発光面に対向して設けられた凹面
状反射面と、前記発光素子が発し前記凹面状反射面によ
り反射された光を外部に放射する放射面とを有する発光
ダイオードにおいて、前記放射面が凸柱面状に形成され
ていることを特徴とする発光ダイオード。(1) A light emitting element, a lead portion for supplying power to the light emitting element, a concave reflective surface provided opposite to the light emitting surface of the light emitting element, and light emitted by the light emitting element and reflected by the concave reflective surface. What is claimed is: 1. A light emitting diode having a radiation surface that emits light to the outside, wherein the radiation surface is formed in a convex column shape.
垂直な面で切り取られた切断面が楕円形状であり、前記
凸柱面状の放射面は前記切断面の長軸と平行となるよう
に形成されていることを特徴とする請求項１記載の発光
ダイオード。(2) The concave reflective surface has an elliptical cut surface cut by a plane perpendicular to the central axis of the concave reflective surface, and the convex cylindrical radiation surface is parallel to the long axis of the cut surface. 2. The light emitting diode according to claim 1, wherein the light emitting diode is formed to have the following characteristics.
に平行な方向に前記２個の発光素子を配列したこと特徴
とする請求項１又は２記載の発光ダイオード。(3) The light emitting diode according to claim 1 or 2, characterized in that two light emitting elements are provided and the two light emitting elements are arranged in a direction parallel to the convex cylindrical radiation surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2133514A JPH0427173A (en) | 1990-05-22 | 1990-05-22 | Light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2133514A JPH0427173A (en) | 1990-05-22 | 1990-05-22 | Light emitting diode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0427173A true JPH0427173A (en) | 1992-01-30 |
Family
ID=15106568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2133514A Pending JPH0427173A (en) | 1990-05-22 | 1990-05-22 | Light emitting diode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0427173A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4885398A (en) * | 1987-07-21 | 1989-12-05 | Nippon Mektron Limited | Process for producing hexafluoroacetone or its hydrate |
-
1990
- 1990-05-22 JP JP2133514A patent/JPH0427173A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4885398A (en) * | 1987-07-21 | 1989-12-05 | Nippon Mektron Limited | Process for producing hexafluoroacetone or its hydrate |
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