JPH0267769A - Led light-emitting device and manufacture of light-emitting block used in the same device - Google Patents

Led light-emitting device and manufacture of light-emitting block used in the same device

Info

Publication number
JPH0267769A
JPH0267769A JP63219675A JP21967588A JPH0267769A JP H0267769 A JPH0267769 A JP H0267769A JP 63219675 A JP63219675 A JP 63219675A JP 21967588 A JP21967588 A JP 21967588A JP H0267769 A JPH0267769 A JP H0267769A
Authority
JP
Japan
Prior art keywords
light emitting
emitting block
lead
led
block
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
Application number
JP63219675A
Other languages
Japanese (ja)
Other versions
JP2504533B2 (en
Inventor
Kenichi Tsuji
健一 辻
Naomi Obara
小原 直美
Shigenori Aoki
重憲 青木
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.)
Dowa Holdings Co Ltd
Kohden Co Ltd
Kaito Chemical Industry Co Ltd
Original Assignee
Dowa Mining Co Ltd
Kohden Co Ltd
Kaito Chemical Industry Co 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 Dowa Mining Co Ltd, Kohden Co Ltd, Kaito Chemical Industry Co Ltd filed Critical Dowa Mining Co Ltd
Priority to JP63219675A priority Critical patent/JP2504533B2/en
Priority to DE3929125A priority patent/DE3929125A1/en
Publication of JPH0267769A publication Critical patent/JPH0267769A/en
Application granted granted Critical
Publication of JP2504533B2 publication Critical patent/JP2504533B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/2696Mounting of devices using LEDs
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/93Batch processes
    • H01L24/95Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
    • H01L24/97Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means 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
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805Shape
    • H01L2224/4809Loop shape
    • H01L2224/48091Arched
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means 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
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481Disposition
    • H01L2224/48151Connecting 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
    • H01L2224/48221Connecting 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
    • H01L2224/48245Connecting 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
    • H01L2224/48247Connecting 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10Details of semiconductor or other solid state devices to be connected
    • H01L2924/11Device type
    • H01L2924/12Passive devices, e.g. 2 terminal devices
    • H01L2924/1204Optical Diode
    • H01L2924/12041LED
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58Optical field-shaping elements

Abstract

PURPOSE:To enhance productivity by a method wherein a light-emitting block where a plurality of LED chips and a plurality of lead-pin pairs are united is piled up on a lend block and an LED lamp aggregate is constituted equivalently in order to make a selection at a stage of a chip and to avoid a selection at a stage of an LED lamp. CONSTITUTION:As a light-emitting block 10, a plurality of LED chips 14 and a plurality of lead pins 15a, 15b for electricity supply use are united by using a resin layer 16. When a substrate 11 for electricity supply use is piled up on its rear, all the plural lead pins 15a, 15b can be pierced collectively through corresponding component-mounting holes 11a; productivity can be enhanced. A lend block 12 where a plurality of condensing lenses 12a have been arranged is fixed to the surface of the light-emitting block 10; an LED aggregate is constituted. Thereby; a selection at a stage of LED chips can be executed when high-brightness light-emitting is required.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、発光体としてLEDを使ったLED発光装
置並びに該装置に用いる発光ブロックの製造方法に関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an LED light emitting device using an LED as a light emitter and a method for manufacturing a light emitting block used in the device.

[従来の技術] 発光体としてLEDを使ったLED発光装置の一従来例
として、第8図に示すものが知られている。
[Prior Art] As a conventional example of an LED light emitting device using an LED as a light emitter, the one shown in FIG. 8 is known.

この発光装置は、プリント基板1の表面に多数のL E
 Dランプ2を配列したもので、通常、まず基板1の部
品取り付け穴(スルーホール)laに各L E Dラン
プ2のリードピン3a、3bを1通させ、しかる後、こ
れらのリードピン3a、3bを基板1の裏面にプリント
された電極配線4に半田付けすることによって製造され
る。
This light emitting device has a large number of L E on the surface of a printed circuit board 1.
It is an array of D lamps 2. Normally, one lead pin 3a, 3b of each LED lamp 2 is passed through the component mounting hole (through hole) la of the board 1, and then these lead pins 3a, 3b are inserted. It is manufactured by soldering to the electrode wiring 4 printed on the back surface of the substrate 1.

[発明が解決しようとする課題] ところが、この従来装置の場合、多数のLEDランプ2
について、一つ一つ基板1へ位置決メジてゆかねばなら
ないため、生産性が非常に悪いという問題があった。
[Problem to be solved by the invention] However, in the case of this conventional device, a large number of LED lamps 2
However, since the positions must be adjusted one by one onto the substrate 1, there is a problem in that productivity is extremely low.

また、LEDランプ2を基板1に位置決めする場合に、
基板1に対して正確に垂直に立てるのは容易でなく、し
かも、半田付けする際にLEDランプ2が動き易いこと
もあり、結果的に、第9図に示すように、各LEDラン
プ2の光軸方向pが不揃いになり、発光装置全体として
は輝度むらが生じるという問題もあった。
Moreover, when positioning the LED lamp 2 on the board 1,
It is not easy to stand the LED lamps 2 accurately perpendicular to the board 1, and the LED lamps 2 tend to move easily during soldering.As a result, as shown in FIG. There is also a problem that the optical axis direction p becomes irregular, resulting in uneven brightness of the light emitting device as a whole.

また、前記発光装置を、例えば、極めて高い輝度か要求
される自動車用ストップランプ等に利用する場合、予め
、各LEDランプ2に高輝度のものを用いなければなら
ないが、高輝度のLEDランプは一般に輝度のばらつき
が大きいため、LEDランプを予め選別して発光装置毎
に輝度の揃ったものを準備しなければならない。
Furthermore, when the light emitting device is used, for example, as a stop lamp for an automobile that requires extremely high brightness, each LED lamp 2 must be of high brightness. Generally, there is a large variation in brightness, so it is necessary to sort LED lamps in advance and prepare LED lamps with uniform brightness for each light emitting device.

しかし、LEDランプ2は、第8図にも示すように、一
対のり−ドビン3a、3bの外に、り一ドビン相互を一
定の間隔で固定するための底部ケース3c、一方のリー
ドピン3a上に接着されるLEDチップ3d、このチッ
プ3dと他方のリードピン3bとを電気的に接続する導
線3e、前記チップ3dの周囲を覆うケースを兼ねたレ
ンズ部3f等の部材が必要で、幾つもの工程を経て製造
される。
However, as shown in FIG. 8, the LED lamp 2 is mounted on a bottom case 3c for fixing the glue dowels at regular intervals in addition to the pair of glue dowels 3a and 3b, and on one lead pin 3a. It requires members such as the LED chip 3d to be bonded, a conductive wire 3e for electrically connecting this chip 3d and the other lead pin 3b, and a lens part 3f that also serves as a case to cover the periphery of the chip 3d, and requires several steps. It is manufactured after

このように、幾つもの工程を経て製造したものを選別に
かけるということは、多数の部材、工程が無駄にされ、
結果的に、製造コストが高価になるという問題もあった
In this way, when products manufactured through multiple processes are subjected to sorting, many parts and processes are wasted.
As a result, there was also a problem that the manufacturing cost became high.

この発明は、前記事情に鑑みてなされたもので、高輝度
の発光が要求されるような場合でも、多数の部材および
工程を費やしたLEDランプを選別にかけるような無駄
を省くことができ、しかも、1、 E Dランプを一つ
一つ基板上に位置ぎめするような作業も必要にならず、
製造コストの低減および生産性の向上の点で優れたLE
D発光装置を提供することを目的としており、さらには
、該LED発光装置に用いる発光ブロックを得るに際し
て、LEDの発光の光軸の不揃いに起因した輝度むらの
発生を防止することのできる発生ブロックの製造方法を
提供することを目的とする。
This invention has been made in view of the above circumstances, and even in cases where high-intensity light emission is required, it is possible to eliminate the waste of sorting out LED lamps that require a large number of parts and processes. Moreover, 1. There is no need for work such as positioning the ED lamps one by one on the board,
LE is superior in terms of reducing manufacturing costs and improving productivity
The object of the present invention is to provide a light-emitting device, and further, to provide a light-emitting block that can prevent the occurrence of uneven brightness due to uneven optical axes of light emitted from LEDs when obtaining a light-emitting block for use in the LED light-emitting device. The purpose is to provide a manufacturing method for.

[課題を解決するための手段] 前述の目的を達成するため、本発明のLED発光装置に
おいては、複数個のLEDチップか平面状に並ぶ発光ブ
ロックと、前記複数個のLEDチップに給電するために
該発光ブロックの裏面に重ね合わせる給電用基板と、L
EDチップの発光を活かすために前記発光ブロックの表
面に重ね合わせるレンズブロックとを備える。
[Means for Solving the Problems] In order to achieve the above-mentioned object, the LED light emitting device of the present invention includes a plurality of LED chips or a light emitting block arranged in a plane, and a method for feeding power to the plurality of LED chips. a power supply substrate overlaid on the back surface of the light emitting block;
A lens block is provided which is superimposed on the surface of the light emitting block in order to take advantage of the light emission of the ED chip.

しかも、前記発光ブロックは、複数個のL E I)チ
ップと、各LEDチップに給電するための複数対のリー
ドピンと、これらのLEDチップとリードピンとを向き
・間隔を揃えて保持する樹脂層とを具備するとともに、
前記樹脂層によって全体として一体化されて、樹脂層の
裏面にリードピンの基端部を突出させた構成をなし、 さらに、前記給電用基板においては、前記発光ブロック
から突出するリードピンの配列に合わせて、リードピン
を差し込む部品取り付け穴と、この部品取り付け穴に差
し込まれたリードピンに給電するための給電回路とを具
備した構成をなし、前記レンズブロックにおいては、一
体成形によって形成され、かつ、発光ブロックにおける
LEDチップの配列に合わせて複数個の集光レンズを平
面状に配列した構成をなしている。
Moreover, the light emitting block includes a plurality of L E I) chips, a plurality of pairs of lead pins for feeding power to each LED chip, and a resin layer that holds these LED chips and lead pins in the same orientation and spacing. In addition to being equipped with
The structure is integrated as a whole by the resin layer, and the base ends of the lead pins protrude from the back surface of the resin layer.Furthermore, in the power supply board, the base ends of the lead pins are arranged in accordance with the arrangement of the lead pins protruding from the light emitting block. The lens block has a component mounting hole into which a lead pin is inserted, and a power supply circuit for supplying power to the lead pin inserted into the component mounting hole. It has a configuration in which a plurality of condensing lenses are arranged in a plane in accordance with the arrangement of the LED chips.

また、前記LED発光装置における発光ブロックの製造
方法においては、 ほぼ棒状をなす複数本のリードピン部とこれらのリード
ピン部の基端部を連結する連結用帯部とを一体に形成し
たリードフレームを用意し、該リードフレームの中間部
を未硬化樹脂に埋設させ、前記樹脂の硬化後に前記リー
ドフレームの連結用帯部を切除することによって、樹脂
層の裏面にリードピンの端部を突出させた構造を得るこ
とを特徴とする。
Further, in the method for manufacturing a light emitting block in the LED light emitting device, a lead frame is prepared in which a plurality of lead pin portions having a substantially rod shape and a connecting band portion connecting the base ends of these lead pin portions are integrally formed. Then, by embedding the middle part of the lead frame in uncured resin and cutting off the connecting band of the lead frame after the resin has hardened, a structure is created in which the ends of the lead pins protrude from the back surface of the resin layer. It is characterized by obtaining.

し作用] この発明のLED発光装置は、独立したLEDランプを
使用するものではなく、複数個のLEDチップおよび複
数対のリードピンを一体化した発光プロ、りとレンズブ
ロックとを重ね合わせることによって、等測的に、複数
個のLEDランプを集合させたLED集合体を構成する
ものである。
Function] The LED light emitting device of the present invention does not use an independent LED lamp, but by overlapping a light emitting device that integrates a plurality of LED chips and a plurality of pairs of lead pins and a lens block. Isometrically, a plurality of LED lamps are assembled to form an LED assembly.

したがって、高輝度の発光が要求されるような場合には
、発光ブロックを製造する際に、LEDチップの段階で
選別を行えば良(、多数の部材、工程を費やしたLED
ランプの段階で選別にかけるような無駄を省くことがで
きる。
Therefore, if high-intensity light emission is required, it is best to select the LED chips at the stage of manufacturing the light-emitting block (which requires a large number of parts and processes).
Wastes such as sorting at the lamp stage can be eliminated.

また、給電用基板における部品取り付け穴の配列を、前
記発光ブロックの裏面から突出するり一ドビンの配列に
合わせているため、前記発光ブロックの裏面に給電用基
板を重ね合わせるだけで、複数対のリードピンを一括し
て対応する部品取り付け穴に挿通した状態にすることが
でき、独立した多数のLEDランプを基板上に一つ一つ
位置ぎめするような手間のかかる作業が必要にならない
In addition, the arrangement of the component mounting holes on the power supply board is matched to the arrangement of the holes protruding from the back surface of the light emitting block, so that multiple pairs of holes can be created by simply stacking the power supply board on the back surface of the light emitting block. The lead pins can be inserted into the corresponding component mounting holes all at once, and there is no need for the time-consuming work of positioning a large number of independent LED lamps one by one on the board.

したがって、本発明のLED発光装置においては、製造
コストを低減させるだけでなく、生産性を向上させるこ
ともできる。
Therefore, in the LED light emitting device of the present invention, it is possible not only to reduce manufacturing costs but also to improve productivity.

また、前記発光ブロックの製造に際しては、複数本のリ
ードピン部が連結用帯部によって相互に連結されたリー
ドフレームを用意しておいて、各リードピン部相互の位
置関係を樹脂層で固定した後に連結用帯部を切除するこ
とによって、複数本のリードピンの端部を樹脂層の裏面
に突出させた構造を得るため、リードピン相互の向きを
合わせるような作業が一切不要であり、確実に総てのリ
ードピンの向きが揃った状態を得ることができ、また、
これによって、リードピンの上に接着されるLEDチッ
プの向きも揃えることができる。
In addition, when manufacturing the light emitting block, a lead frame in which a plurality of lead pin parts are connected to each other by a connecting band part is prepared, and the positional relationship of each lead pin part is fixed with a resin layer, and then the leads are connected. By cutting off the strip, a structure is obtained in which the ends of multiple lead pins protrude from the back side of the resin layer, so there is no need to align the directions of the lead pins, and all The lead pins can be aligned in the same direction, and
This allows the orientation of the LED chips bonded onto the lead pins to be aligned.

したがって、本発明の製造方法によれば、LEDの発光
の光軸の不揃いに起因した輝度むらの発生を防止して、
品質の向上を図るとともに製品歩留りの向上を図ること
ができる。
Therefore, according to the manufacturing method of the present invention, the occurrence of uneven brightness due to the unevenness of the optical axes of the light emitted from the LEDs can be prevented.
It is possible to improve quality and product yield.

[実施例] 以下、本発明の一実施例であるLED発光装置と、この
LED発光装置における発光ブロックの製造方法とを説
明する。
[Example] Hereinafter, an LED light emitting device which is an example of the present invention and a method for manufacturing a light emitting block in this LED light emitting device will be described.

第1図は、本発明の一実施例であるLED発光装置を使
った自動車用ストップランプの横断面を示したものであ
る。
FIG. 1 shows a cross section of an automobile stop lamp using an LED light emitting device, which is an embodiment of the present invention.

このストップランプは、車体の高位置に配置されるハイ
マウントタイプのもので、不透明な合成樹脂等によって
形成されて車体に組み込まれる外ケース6と、この外ケ
ース6の前面開口部を覆う透明(又は半透明)のレンズ
板7と、一実施例のLED発光装置8とから構成されて
いる。
This stop lamp is a high-mount type that is placed at a high position on the vehicle body, and includes an outer case 6 that is made of opaque synthetic resin and is incorporated into the vehicle body, and a transparent ( It is composed of a lens plate 7 (or translucent) and an LED light emitting device 8 of one embodiment.

この一実施例のLED発光装置8は、発光ブロック10
と、給電用基板11と、レンズプロ・ツク12との3つ
のユニットとからなり、これらのユニ、1・を重ね合わ
せることによって形成されている。
The LED light emitting device 8 of this embodiment includes a light emitting block 10
It consists of three units: a power feeding board 11, and a lens pro 12, and is formed by overlapping these units.

各ユニットについて詳述すると、前記発光ブロック10
は、複数個のLEDチップ14と、各LEDチップ14
に給電するための複数対のリードピン15a、15bと
、これらのLEDチップ14とリードピン15a、15
bとを向き・間隔を揃えて保持する樹脂層16とを具備
しており、前記樹脂層16によって全体として一体化さ
れている。
To explain each unit in detail, the light emitting block 10
includes a plurality of LED chips 14 and each LED chip 14.
A plurality of pairs of lead pins 15a, 15b for supplying power to the LED chip 14 and the lead pins 15a, 15.
b, and a resin layer 16 that holds the parts 1 and 2 in the same direction and at the same intervals, and is integrated as a whole by the resin layer 16.

互いに対をなすリードピン15a、15bは、後述の製
造方法の項で説明するリードフレーム(第3図参照)に
よって提供されるもので、同じす−ドフレームを2個並
列に配置することによって、平行に2列に並ぶ配列を得
ている(第7図参照)。
The pair of lead pins 15a and 15b are provided by a lead frame (see Fig. 3), which will be explained in the manufacturing method section below. (See Figure 7).

これらのリードピン15a、15bは、金属板をプレス
加工機で打ち抜くことによって形成されている。また、
それぞれのリードピン15a、15bは、ほぼ棒状を呈
していて、基端部が樹脂層16の裏面側(第1図で下側
)に突出している。
These lead pins 15a, 15b are formed by punching out a metal plate using a press machine. Also,
Each of the lead pins 15a, 15b has a substantially rod-like shape, and a base end thereof protrudes toward the back side of the resin layer 16 (lower side in FIG. 1).

また、一方のリードピン15aは、十の電極となるもの
で、その先端部には、前記LEDチップ14を載せるた
めの反射器17が形成されている。
Further, one lead pin 15a serves as an electrode, and a reflector 17 on which the LED chip 14 is placed is formed at its tip.

この反射器17は、リードピン15aの先端面にプレス
加工によって窪部を形成したもので、その底部17aは
ピンの長平方向に直交する平坦面に形成され、この底部
17Hの周囲を囲う周壁部17bは先端側に向けて徐々
に径を広げたコーン形に形成されている。この反射器1
7は、底部17aに載置したLEDチップ14の発光に
よる光りが側方に散乱するのを防止して、光量をupさ
せる。
This reflector 17 has a recess formed by press working on the tip end surface of a lead pin 15a, the bottom 17a of which is formed into a flat surface perpendicular to the longitudinal direction of the pin, and a peripheral wall 17b surrounding the bottom 17H. It is formed into a cone shape that gradually widens in diameter toward the tip. This reflector 1
7 prevents the light emitted from the LED chip 14 placed on the bottom portion 17a from scattering to the side, thereby increasing the amount of light.

底部17aに載置されるLEDチップ14の下面は、導
電性接着剤により底部17aに固定され、また、−この
LEDチップ14の上面は、導線(材質としては、例え
ば、金、あるいは銅、あるいはアルミニウム等が使用さ
れる)18を介して、の電極となる他方のリードピン1
5bに電気的に接続されている。
The lower surface of the LED chip 14 placed on the bottom 17a is fixed to the bottom 17a with a conductive adhesive, and the upper surface of the LED chip 14 is fixed to the bottom 17a with a conductive wire (for example, gold, copper, or The other lead pin 1 serves as the electrode of the
5b.

前記樹脂層16は、前述の複数対のリードピン15a、
15b柑互を一定の間隔で、しがも総てのリードピンの
向きを揃えた状態で固定するピン固定層16aと、前述
の導線18やLEDチップ14を埋設状態にして保護す
る保護層16bとからなる。
The resin layer 16 includes the plurality of pairs of lead pins 15a described above,
A pin fixing layer 16a that fixes the lead pins 15b at regular intervals with all the lead pins aligned in the same direction, and a protective layer 16b that protects the conductive wires 18 and LED chips 14 by embedding them. Consisting of

また、この一実施例のものの場合、固定層16aは、各
リードピン15a、15bの先端部を露呈させる窪み1
6cを有している。そして、前記保護層16bは、前記
窪み16cを透明な合成樹脂(例えば、エポキシ樹脂)
によって埋めたものである。なお、窪み16cの側面は
、第1図にも示すように、傾斜している。この傾斜は、
LEDチップ14からの光りをレンズブロック12側に
行き易くしている。
Further, in the case of this embodiment, the fixed layer 16a has a recess 1 exposing the tip of each lead pin 15a, 15b.
It has 6c. The protective layer 16b is made of transparent synthetic resin (for example, epoxy resin) to form the recess 16c.
It was filled in by Note that the side surface of the depression 16c is inclined, as also shown in FIG. This slope is
Light from the LED chip 14 is made easier to reach the lens block 12 side.

以上のような構成によって、発光ブロック10は、複数
個のLEDチップ14を平面状に並べて一体化したユニ
ットとなっている。
With the above configuration, the light emitting block 10 is a unit in which a plurality of LED chips 14 are arranged in a plane and integrated.

前記給電用基板11は、発光ブロック10上の複数個の
LEDチップ14に給電するために発光ブロック10の
裏面に重ね合わすプリント基板で、前記発光ブロック1
0の裏面に突出するリードピア15a、15bの配列に
合わせて、リードピンを差し込む部品取り付け穴11a
が貫通形成されている。また、該基板11の裏面には、
これらの部品取り付け穴11aに差し込まれたリードピ
ン15a、15bに給電するため給電回路(図示略)が
プリントされている。
The power supply board 11 is a printed circuit board that is superimposed on the back surface of the light emitting block 10 in order to supply power to the plurality of LED chips 14 on the light emitting block 10.
Component mounting holes 11a into which lead pins are inserted in accordance with the arrangement of lead piers 15a and 15b protruding from the back surface of 0.
is formed through it. Moreover, on the back surface of the substrate 11,
A power supply circuit (not shown) is printed to supply power to the lead pins 15a and 15b inserted into these component mounting holes 11a.

したがって、前記発光ブロック10の各リードピン15
a、15bは、発光ブロック10の裏面に基板11を重
ね合わせた状態にすることによって、基板11における
部品取り付け穴11bに一括して挿通させることができ
、また、基板11の裏面に突出した各リードピンを半田
付けすることによって、各リードピンと給電回路とが電
気的に接続される。
Therefore, each lead pin 15 of the light emitting block 10
a and 15b can be inserted all at once into the component mounting holes 11b in the board 11 by overlapping the board 11 on the back side of the light emitting block 10, and each of the parts a and 15b protruding from the back side of the board 11 By soldering the lead pins, each lead pin and the power supply circuit are electrically connected.

前記レンズブロック12は、発光ブロック1゜のLED
チップ14の発光を活かすために、前記発光ブロック1
0の表面に重ね合わせるもので、発光ブロック10にお
けるLEDチップの配列に合わせて複数個の集光レンズ
12aを平面状に連続させて配列した構造をなす。この
レンズブロック12は、透明の合成樹脂等の一体成形に
より形成されている。このレンズブロックI2は、例え
ば、接着剤によって発光ブロック1oの上面に固定され
、このレンズブロック12と発光ブロック10との一体
化によって、等測的に、複数個のしEDランプを集合さ
せたLED集合体が構成される。
The lens block 12 is a light emitting block 1° LED.
In order to utilize the light emission of the chip 14, the light emitting block 1
It has a structure in which a plurality of condensing lenses 12a are consecutively arranged in a plane in accordance with the arrangement of LED chips in the light emitting block 10. This lens block 12 is formed by integral molding of transparent synthetic resin or the like. This lens block I2 is fixed to the upper surface of the light emitting block 1o by, for example, an adhesive, and by integrating the lens block 12 and the light emitting block 10, an LED is created in which a plurality of LED lamps are assembled isometrically. An aggregate is formed.

以上の如きLED発光装置8においては、高輝度の発光
が要求されるような場合には、発光プロ・ツクlOを製
造する際に、LEDチップの段階で選別を行えば良く、
多数の部材及び工程を費やしたLEDランプの段階で選
別にかけるような無駄を省くことができる。
In the LED light-emitting device 8 as described above, if high-intensity light emission is required, selection may be performed at the LED chip stage when manufacturing the light-emitting block 10.
It is possible to eliminate the waste of sorting at the LED lamp stage, which requires a large number of parts and processes.

また、前述したように、前記発光ブロック10の裏面に
給電用基板11を重ね合わせるだけで、複数対のリード
ピン15a、15bの総てを一括して対応する部品取り
付け穴11aに挿通した状態にすることができ、独立し
た多数のLEDランプを基板上に一つ一つ位置ぎめする
ような手間のかかる作業が必要にならない。
Further, as described above, simply by overlapping the power supply board 11 on the back surface of the light emitting block 10, all the pairs of lead pins 15a, 15b can be inserted into the corresponding component mounting holes 11a at once. This eliminates the need for time-consuming work such as positioning a large number of independent LED lamps one by one on the board.

したがって、実施例のLED発光装置8においては、製
造コストを低減させるだけでなく、生産性を向上させる
こともできる。
Therefore, in the LED light emitting device 8 of the example, it is possible not only to reduce manufacturing costs but also to improve productivity.

また、この実施例のLED発光装置8においては、LE
Dチップ14が反射器17上にセットされていて、LE
Dチップ14の側面からでた光が該反射器によって集光
レンズ12Hの方向に集められるため、分散による損失
が効果的に防止され、光量のupを図ることができる。
Further, in the LED light emitting device 8 of this embodiment, the LED
The D chip 14 is set on the reflector 17, and the LE
Since the light emitted from the side surface of the D-chip 14 is collected by the reflector in the direction of the condenser lens 12H, loss due to dispersion is effectively prevented, and the amount of light can be increased.

次に、前記発光ブロック10の製造方法を第3図〜第7
図に基づいて説明する。
Next, a method for manufacturing the light emitting block 10 will be explained in FIGS. 3 to 7.
This will be explained based on the diagram.

まず、第3図に示すようなリードフレーム25を2本用
意する。このリードフレーム25は、後にリードピン1
5a、15bとなる複数対のリードピン部25a、25
bと、これらのリードピン部25a、25bの下部を連
結する連結用帯部25c、25dとを一体に形成したも
ので、金属板をプレス加工で打ち抜くことによって形成
されている。そして、それぞれのリードピン部25a。
First, two lead frames 25 as shown in FIG. 3 are prepared. This lead frame 25 will later be attached to the lead pin 1.
Plural pairs of lead pin portions 25a, 25, 5a, 15b
b, and connecting band portions 25c and 25d that connect the lower portions of these lead pin portions 25a and 25b are integrally formed, and are formed by punching out a metal plate by press working. And each lead pin part 25a.

25bは、ほぼ棒状をなすとともに、延在する方向が揃
えられている。また、後にリードピン15aとなるリー
ドピン部25aの先端部には、前述の反射器17が形成
されている。この反射器17は、前述のようにプレス加
工によってリードピン部25aの先端面に窪みを形成し
たもので、LEDチップ14の載置部となる。
25b is substantially rod-shaped and extends in the same direction. Furthermore, the aforementioned reflector 17 is formed at the tip of the lead pin portion 25a, which will later become the lead pin 15a. The reflector 17 is formed by forming a depression on the tip end surface of the lead pin portion 25a by press working as described above, and serves as a mounting portion for the LED chip 14.

そして、次には、第4図に示すように、固定層16aを
形成する工程と、チップ14を反射器17にセットして
、このチップ14と他方のリードビン部25bの先端と
導線18で接続する工程とを行う。これらの工程は、ど
ちらを先に行っても良いが、チップ14と導線18とを
セットする工程を後にしたほうが、作業が行い易い。
Next, as shown in FIG. 4, there is a step of forming a fixed layer 16a, setting the chip 14 on a reflector 17, and connecting this chip 14 to the tip of the other lead bin part 25b with a conductive wire 18. and the process of doing so. Although either of these steps may be performed first, it is easier to perform the work if the step of setting the chip 14 and the conductive wire 18 is performed later.

固定層16aを形成する工程は、2本のリードフレーム
25を平行に立てた状態にし、この状態でそれぞれのリ
ードフレーム25の中間部等を成形型の中に位置決めす
る。そして、成形型内に不透明の未硬化の合成樹脂を充
填して、リードビン部25a、25bの中間から先端ま
での部分を樹脂中に埋設した状態にする。そして、前記
樹脂が硬化したら、リードフレーム25を型から取り出
せば良い。
In the step of forming the fixed layer 16a, the two lead frames 25 are placed in a parallel state, and in this state, the intermediate portions of each lead frame 25 are positioned in a mold. Then, the mold is filled with an opaque, uncured synthetic resin, so that the portions of the lead bin portions 25a, 25b from the middle to the tip are embedded in the resin. After the resin has hardened, the lead frame 25 can be taken out of the mold.

次には、第5図に示すように、保護層16bを形成する
。この保護層16bの形成は、前記固定層]、 6 a
の窪み16Cに透明または半透明の合成樹脂(例えば、
エポキシ樹脂)等を充填させて、硬化させれば良い。
Next, as shown in FIG. 5, a protective layer 16b is formed. The formation of this protective layer 16b is based on the above-mentioned fixed layer], 6 a
Transparent or translucent synthetic resin (for example,
It is sufficient to fill it with epoxy resin or the like and harden it.

前述の固定層16aおよび保護層16bの成形法として
は、例えば、射出成形法、圧縮成形法、キャスティング
成形法等の既存の成形法だけでなく、既存のものに改良
を加えた方法も利用することができる。
As the molding method for the above-mentioned fixed layer 16a and protective layer 16b, for example, not only existing molding methods such as injection molding method, compression molding method, and casting molding method, but also methods in which improvements are made to existing methods are used. be able to.

次には、第6図に示すように、連結用帯部25c、  
25dを切除する。この切除によって、今まで連結状態
にあった各リードビン部25a、25bが独立して、リ
ードピン15a、15bとなり、発光ブロック10か完
成する。
Next, as shown in FIG. 6, the connecting band portion 25c,
Excise 25d. By this cutting, the lead bin parts 25a and 25b, which have been in a connected state up until now, become independent and become lead pins 15a and 15b, and the light emitting block 10 is completed.

なお、第6図は第5図におけるVI−VI線の位置での
断面図であり、第7図は第5図における矢印■方向から
の矢視図である。
6 is a cross-sectional view taken along line VI--VI in FIG. 5, and FIG. 7 is a sectional view taken from the direction of arrow {circle around (2)} in FIG. 5.

以上のような製造方法によって発光ブロック10を製造
した場合では、リードピン15a、15b相互の向きを
一致させるための位置調整作業が一切不要であり、確実
に総てのリードピン15a15bの向きが揃った状態を
得ることができ、また、これによって、リードピン15
aの上に接青されるLEDチップ14の向きも揃えるこ
とかできる。
When the light emitting block 10 is manufactured by the above manufacturing method, there is no need for any position adjustment work to align the directions of the lead pins 15a and 15b, and it is possible to ensure that all the lead pins 15a and 15b are aligned in the same direction. can be obtained, and by this, the lead pin 15
It is also possible to align the orientation of the LED chips 14 that are attached to the top of a.

したがって、この製造方法によれば、LEDの発光の光
軸の不揃いに起因した輝度むらの発生を防止して、品質
の向上を図るとともに製品歩留りの向上を図ることがで
きる。
Therefore, according to this manufacturing method, it is possible to prevent the occurrence of brightness unevenness due to irregularities in the optical axes of the light emitted from the LEDs, thereby improving quality and product yield.

なお、この製造方法で使用したリードフレーム25は、
一対のリードピン25a、25bを交互に一列に配列し
たものであるが、LEDチップ14の向きを揃えるとい
う効果を得るためだけであれば、LEDチップ14を載
せるリードピン部25aだけを一定間隔で並べたリード
フレームを作ることも考えることができる。
Note that the lead frame 25 used in this manufacturing method is
Although a pair of lead pins 25a and 25b are arranged alternately in a line, if only the effect of aligning the directions of the LED chips 14 is to be obtained, only the lead pin portions 25a on which the LED chips 14 are placed may be arranged at regular intervals. You can also consider making a lead frame.

また、前述の方法では、樹脂層16を固定層16aと保
護層16bとの2層に分けて、各層毎に工程を分けて形
成したが、使用する合成樹脂の種類や成形法を適宜選定
することによって、−工程で形成したり、−層の構造に
することもできる。
In addition, in the method described above, the resin layer 16 is divided into two layers, the fixed layer 16a and the protective layer 16b, and a separate process is performed for each layer. However, the type of synthetic resin used and the molding method may be selected as appropriate. Depending on the process, it can be formed in a -step or can have a -layer structure.

[発明の効果コ この発明のLED発光装置は、独立したLEDランプを
使用するものではなく、複数個のLEDチップおよび複
数対のリードピンを一体化した発光プロ、りとレンズブ
ロックとを重ね合わせることによって、等測的に、複数
個のLEDランプを集合させたLED集合体を構成する
ものである。
[Effects of the Invention] The LED light emitting device of this invention does not use independent LED lamps, but uses a light emitting device that integrates multiple LED chips and multiple pairs of lead pins, and overlaps a lens block. Accordingly, a plurality of LED lamps are assembled isometrically to form an LED assembly.

したがって、高輝度の発光が要求されるような場合には
、発光ブロックを製造する際に、LEDチップの段階で
選別を行えば良く、多数の部材、工程を費やしたLED
ランプの段階で選別にかけるような無駄を省(ことがで
きる。
Therefore, if high-intensity light emission is required, it is sufficient to select the LED chips at the stage of manufacturing the light-emitting block, which eliminates the need for LEDs that require a large number of parts and processes.
It is possible to eliminate waste such as sorting at the lamp stage.

また、給電用基板における部品取り付け穴の配列を、前
記発光ブロックの裏面から突出するリードピンの配列に
合わせているため、前記発光ブロックの裏面に給電用基
板を重ね合わせるだけで、複数対のリードピンを一括し
て対応する部品取り付け穴に挿通した状態にすることが
でき、独立した多数のLEDランプを基板上に一つ一つ
位置ぎめするような手間のかかる作業が必要にならない
In addition, the arrangement of the component mounting holes on the power supply board matches the arrangement of the lead pins protruding from the back surface of the light emitting block, so multiple pairs of lead pins can be installed by simply stacking the power supply board on the back surface of the light emitting block. They can be inserted into the corresponding component mounting holes all at once, and there is no need for the time-consuming work of positioning a large number of independent LED lamps one by one on the board.

したがって、本発明のLED発光装置においては、製造
コストを低減させるだけでなく、生産性を向上させるこ
ともできる。
Therefore, in the LED light emitting device of the present invention, it is possible not only to reduce manufacturing costs but also to improve productivity.

また、前記LED発光装置における発光ブロックの製造
方法においては、複数本のリードピン部が連結用帯部に
よって相互に連結されたリードフレームを用意しておい
て、各リードピン部相互の位置関係を樹脂層で固定した
後に連結用帯部を切除することによって、複数本のリー
ドピンの端部を樹脂層の裏面に突出させた構造を得るた
め、リードビン相互の向きを合わせるような作業が一切
不要であり、確実に総てのリードピンの向きが揃った状
態を得ることができ、また、これによって、リードピン
の上に接着されるLEDチップの向きも揃えることがで
きる。
Further, in the method for manufacturing a light emitting block in the LED light emitting device, a lead frame in which a plurality of lead pin portions are connected to each other by a connecting band portion is prepared, and the mutual positional relationship of each lead pin portion is determined by a resin layer. By cutting off the connecting band after fixing with the resin layer, a structure is obtained in which the ends of the multiple lead pins protrude from the back side of the resin layer, so there is no need to align the directions of the lead bins. It is possible to ensure that all the lead pins are oriented in the same direction, and thereby the LED chips bonded onto the lead pins can also be oriented in the same direction.

したがって、本発明の製造方法によれば、LEDの発光
の光軸の不揃いに起因した輝度むらの発生を防止して、
品質の向上を図るとともに製品歩留りの向上を図ること
ができる。
Therefore, according to the manufacturing method of the present invention, the occurrence of uneven brightness due to the unevenness of the optical axes of the light emitted from the LEDs can be prevented.
It is possible to improve quality and product yield.

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

第1図は本発明のLED発光装置の一実施例の横断面図
、第2図は第1図の要部の斜視図、第3図〜第7図は前
記一実施例における発光ブロックの製造方法を説明する
ためのもので、第3図は該方法に使用するリードフレー
ムの構造説明図、第4図は固定層を形成する工程の説明
図、第5図は保護層を形成する工程の説明図、第6図は
第5図におけるVI−VI線に沿う位置で断面した場合
の図でリードフレームの連結用帯部を切除する工程の説
明図、第7図は第5図における矢印■による矢視図、第
8図は従来のLED発光装置の構成説明図、第9図はこ
の従来装置における問題点の説明図である。 8・・・・・・LED発光装置、10・・・・・・発光
ブロック、11・・・・・・給電用基板、lla・・・
・・・部品取り付け穴、12・・・・・・レンズブロッ
ク、12a・・・・・集光レンズ、14・・・・・・L
EDチップ、15a、15b・・・・・・リードピン、
16・・・・・・樹脂層、16a・・・・・・固定層、
16b・・・・・・保護層、17・・・・・・反射皿、
18・・・・・・導線。
FIG. 1 is a cross-sectional view of an embodiment of the LED light emitting device of the present invention, FIG. 2 is a perspective view of the main part of FIG. 1, and FIGS. 3 to 7 are manufacturing of the light emitting block in the embodiment These are for explaining the method. Figure 3 is an explanatory diagram of the structure of a lead frame used in the method, Figure 4 is an explanatory diagram of the process of forming a fixed layer, and Figure 5 is an explanatory diagram of the process of forming a protective layer. Explanatory drawing, Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 5, and is an explanatory drawing of the process of cutting out the connecting band portion of the lead frame, and Fig. 7 is a cross-sectional view taken along line VI-VI in Fig. 5. 8 is an explanatory diagram of the configuration of a conventional LED light emitting device, and FIG. 9 is an explanatory diagram of problems in this conventional device. 8... LED light emitting device, 10... light emitting block, 11... power supply board, lla...
...Parts mounting hole, 12...Lens block, 12a...Condensing lens, 14...L
ED chip, 15a, 15b...Lead pin,
16... Resin layer, 16a... Fixed layer,
16b...protective layer, 17...reflection plate,
18... Conductor.

Claims (1)

【特許請求の範囲】 1、複数個のLEDチップが平面状に並ぶ発光ブロック
と、前記複数個のLEDチップに給電するために該発光
ブロックの裏面に重ね合わせる給電用基板と、LEDチ
ップの発光を活かすために前記発光ブロックの表面に重
ね合わせるレンズブロックとを備え、 前記発光ブロックは、複数個のLEDチップと、各LE
Dチップに給電するための複数対のリードピンと、これ
らのLEDチップとリードピンとを向き・間隔を揃えて
保持する樹脂層とを具備するとともに、前記樹脂層によ
って全体として一体化されて、樹脂層の裏面にリードピ
ンの基端部を突出させた構成をなし、 一方、前記給電用基板は、前記発光ブロックから突出す
るリードピンの配列に合わせて、リードピンを差し込む
部品取り付け穴と、この部品取り付け穴に差し込まれた
リードピンに給電するための給電回路とを具備した構成
をなし、 前記レンズブロックは、一体成形によって形成され、か
つ、発光ブロックにおけるLEDチップの配列に合わせ
て複数個の集光レンズを平面状に配列した構成をなして
いることを特徴とするLED発光装置。 2、請求項1記載のLED発光装置における発光ブロッ
クの製造方法であって、 ほぼ棒状をなす複数本のリードピン部とこれらのリード
ピン部の基端部を連結する連結用帯部とを一体に形成し
たリードフレームを用意し、該リードフレームの中間部
を未硬化樹脂に埋設させ、前記樹脂の硬化後に前記リー
ドフレームの連結用帯部を切除することによって、樹脂
層の裏面にリードピンの基端部を突出させた構造を得る
ことを特徴とした発光ブロックの製造方法。
[Scope of Claims] 1. A light emitting block in which a plurality of LED chips are arranged in a planar manner, a power supply substrate superimposed on the back surface of the light emitting block to supply power to the plurality of LED chips, and a light emitting block of the LED chips; and a lens block superimposed on the surface of the light emitting block in order to take advantage of the light emitting block, and the light emitting block includes a plurality of LED chips and each
It includes a plurality of pairs of lead pins for feeding power to the D chip, and a resin layer that holds these LED chips and lead pins in the same orientation and spacing, and is integrated as a whole by the resin layer, and the resin layer The base end of the lead pin protrudes from the back surface of the light emitting block, and the power supply board has a component mounting hole into which the lead pin is inserted in accordance with the arrangement of the lead pins protruding from the light emitting block, and a component mounting hole into which the lead pin is inserted. The lens block includes a power supply circuit for supplying power to the inserted lead pins, and the lens block is formed by integral molding, and a plurality of condensing lenses are arranged in a plane according to the arrangement of the LED chips in the light emitting block. An LED light emitting device characterized by having a configuration in which the LEDs are arranged in a shape. 2. A method for manufacturing a light emitting block in an LED light emitting device according to claim 1, comprising integrally forming a plurality of substantially rod-shaped lead pin portions and a connecting band portion connecting base ends of these lead pin portions. By preparing a lead frame, embedding the middle part of the lead frame in uncured resin, and cutting off the connecting band of the lead frame after the resin hardens, the proximal ends of the lead pins are embedded on the back side of the resin layer. A method for producing a light-emitting block, characterized by obtaining a structure in which the light-emitting block protrudes.
JP63219675A 1988-09-02 1988-09-02 LED light emitting device and method of manufacturing light emitting block used in the device Expired - Fee Related JP2504533B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP63219675A JP2504533B2 (en) 1988-09-02 1988-09-02 LED light emitting device and method of manufacturing light emitting block used in the device
DE3929125A DE3929125A1 (en) 1988-09-02 1989-09-01 LED array with diode coupled pins - has light emitting block with several LED chips on power supply substrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63219675A JP2504533B2 (en) 1988-09-02 1988-09-02 LED light emitting device and method of manufacturing light emitting block used in the device

Publications (2)

Publication Number Publication Date
JPH0267769A true JPH0267769A (en) 1990-03-07
JP2504533B2 JP2504533B2 (en) 1996-06-05

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Country Status (2)

Country Link
JP (1) JP2504533B2 (en)
DE (1) DE3929125A1 (en)

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Also Published As

Publication number Publication date
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DE3929125A1 (en) 1990-03-22

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