JPH0436589B2 - - Google Patents
Info
- Publication number
- JPH0436589B2 JPH0436589B2 JP60012069A JP1206985A JPH0436589B2 JP H0436589 B2 JPH0436589 B2 JP H0436589B2 JP 60012069 A JP60012069 A JP 60012069A JP 1206985 A JP1206985 A JP 1206985A JP H0436589 B2 JPH0436589 B2 JP H0436589B2
- Authority
- JP
- Japan
- Prior art keywords
- led
- light
- light source
- leds
- total reflection
- 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.)
- Expired - Lifetime
Links
- 230000004907 flux Effects 0.000 description 12
- 239000011159 matrix material Substances 0.000 description 7
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000003760 hair shine Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000007688 Lycopersicon esculentum Nutrition 0.000 description 1
- 240000003768 Solanum lycopersicum Species 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor 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
- H01L33/48—Semiconductor 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
- H01L33/58—Optical field-shaping elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor 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
- H01L33/48—Semiconductor 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
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は赤外線又は可視光線LEDランプ、車
輌用灯具、各種信号灯、各種表示灯及び情報表示
板の光源等に使用されるLED光源体に関するも
のである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an LED light source body used as a light source for infrared or visible light LED lamps, vehicle lights, various signal lights, various indicator lights, information display boards, etc. It is.
LEDを使用したこの種の光源体にあつては
種々の構造のものが公知である。一般的に使用さ
れているLEDは第７図に示した構造を有してい
る。即ち、一対のリードフレーム１，２の一方の
リードフレーム１上にLED素子３をマウントし、
該LED素子３と他方のリードフレーム２とをワ
イヤ４でボンデイングし、樹脂モールドすること
によつて丸形レンズ付のLED５を形成したもの
である。このLEDを使用して角形、つまり四角
形状の光源を形成する場合には、第８図に示した
ように、例えば４個のLED５ａ〜５ｄを隣接状
態に並べて角形面光源と見做した時に、斜線部分
が非発光面６となる。又、第９図に示したよう
に、ドツトマトリスクの光源として使用する場合
には、格子状の遮光枠７を必要とし、その内側を
夫々反射部８として使用するようにし、各反射部
の略中央部にLED５を取付けるようにしている。
尚各LEDは基板９に所定の間隔をもつて取付け
られている。
Various structures of this type of light source using LEDs are known. A commonly used LED has the structure shown in FIG. That is, the LED element 3 is mounted on one lead frame 1 of a pair of lead frames 1 and 2,
The LED element 3 and the other lead frame 2 are bonded with a wire 4 and resin molded to form an LED 5 with a round lens. When using these LEDs to form a rectangular light source, as shown in FIG. The shaded area becomes the non-light emitting surface 6. In addition, as shown in FIG. 9, when used as a light source for dot tomato risk, a grid-like light-shielding frame 7 is required, the inside of which is used as a reflecting part 8, and each reflecting part is LED5 is installed approximately in the center.
Note that each LED is attached to the substrate 9 at a predetermined interval.
このように従来例のLED５は丸形のレンズ部
を有しているため、LEDから放射する光の形態
も円形状となり、多数のLEDを角形面の光源と
して使用する場合には、各LED間の隙間をなく
すように隣接した状態で配設しなければならない
が、第８図に示したように４個以上のLEDを使
用すると対角するLED間には大きな隙間が生じ
て非発光面６が大きくなり角形面の光源と見做し
得なくなる。従つて、対角するLEDの隙間を小
さくするためにはLED自体を小型化する必要が
あり、LEDを小型化すると予定された大きさの
角形面光源を形成するには多数のLEDが必要と
なり極めて不経済である。更に、LEDは丸形の
レンズ部で形成されており、LED素子から放射
さる光束全てを丸形のレンズ部で前方に効果的に
導出できないという問題点がる。 In this way, since the conventional LED 5 has a round lens part, the form of the light emitted from the LED is also circular, and when using a large number of LEDs as a light source on a square surface, it is necessary to However, if four or more LEDs are used as shown in Figure 8, there will be large gaps between the diagonal LEDs, causing the non-light emitting surface 6 becomes so large that it can no longer be considered a light source on a rectangular surface. Therefore, in order to reduce the gap between diagonal LEDs, it is necessary to miniaturize the LEDs themselves, and when LEDs are miniaturized, a large number of LEDs are required to form a rectangular surface light source of the planned size. It is extremely uneconomical. Furthermore, since the LED is formed of a round lens, there is a problem in that the entire luminous flux emitted from the LED element cannot be effectively guided forward by the round lens.
また、ドツトマトリクスを構成する場合でも、
格子状の遮光枠を必要とし、該遮光枠の存在で各
LEDが仕切られることになり枠の巾が表出する
ばかりでなく、各LEDが取付けられる反射部に
太陽光が当ると疑似点灯現象が生じ、視認性が悪
くなるという問題点も有する。 Also, even when configuring a dot matrix,
A grid-like light-shielding frame is required, and the presence of the light-shielding frame allows each
Since the LEDs are partitioned, not only the width of the frame is exposed, but also a false lighting phenomenon occurs when sunlight hits the reflective part to which each LED is attached, resulting in poor visibility.
本発明は前記従来例おける問題点、即ち角形面
光源を形成する場合の非発光部発生の問題点及び
LED素子から放射される光束の内、丸形レンズ
でコントロールできない無駄な光束が生ずる点、
更にはドツトマトリクス形成時の遮光枠による問
題点を解決しようとするもである。
The present invention solves the problems in the conventional example, that is, the problems of non-light emitting parts occurring when forming a rectangular surface light source, and
Of the luminous flux emitted from the LED element, there is a wasted luminous flux that cannot be controlled by the round lens.
Furthermore, it is an attempt to solve problems caused by a light-shielding frame when forming a dot matrix.
本発明は前記問題点解決する具体的手段とし
て、LED素子をリードフレーム又はステムもし
くは基板等にマウント及びワイヤー接続し、樹脂
モールドしたLEDと、中心部に貫通孔を有し側
面外周がテーパ状で且つ一部がカツトされて発光
面が角形になる略ホーン状の全反射レンズとから
なり、前記貫通孔に前記LEDを挿着して合体さ
せたことを特徴とするLED発光体を提供するも
のであつて、LEDと全反射レンズとを合体させ
たことによりLED素子から側面側に放射される
光束を全反射レンズのテーパ面で前方に取出し、
光束の無駄をなくすと共に発光面を角形に形成し
てあるので隣接状態に複数個並設した場合でも隣
接LED間に実質的な非発光面が生じなくなり、
均等な照度の角形面光源が形成できるのである。
As a specific means for solving the above-mentioned problems, the present invention provides an LED in which an LED element is mounted on a lead frame, a stem, a substrate, etc. and connected by wire, and is molded with resin. Further, an LED light emitting body is provided, comprising a substantially horn-shaped total reflection lens whose part is cut so that the light emitting surface is rectangular, and the LED is inserted into the through hole and combined. By combining the LED and the total reflection lens, the light beam emitted from the LED element to the side is extracted forward by the tapered surface of the total reflection lens,
In addition to eliminating wasted luminous flux, the light-emitting surface is formed into a square shape, so even when multiple LEDs are installed next to each other, there is no substantial non-light-emitting surface between adjacent LEDs.
A rectangular surface light source with uniform illuminance can be formed.
次に本発明を図示の実施例により更に詳しく説
明する。尚、従来例と同一部分には同一符号を付
してその説明を省略する。
Next, the present invention will be explained in more detail with reference to illustrated embodiments. Incidentally, the same parts as those in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.
第１〜４図に示した第１実施例において、５は
LEDであり、該LEDは従来例と同じように一対
のリードフレーム１，２を備えると共にLED素
子３がマウントされ、ワイヤ４がボンデイングさ
れた構成になつている。このLED５と組合せて
用いられる全反射レンズ１１は光透過性の樹脂で
全体形状が略ホーン状に形成され、中心部に貫通
孔１２が設けられている。この貫通孔の内径は前
記LED５が略嵌り込む寸法に形成されている。
全反射レンズ１１の側面外周は曲面をもつたテー
パ面１３に形成され、該テーパ面の一部、即ち発
光面側をカツトして発光面を略四角形状に形成す
る。このLED５と全反射レンズ１１との合体は
両者を別々に形成し、貫通孔１２内にLED５を
挿着するか又は、全反射レンズ１１を成型する際
に型内にLEDを挿着し一体的に成型して一個の
光源体として形成しても良い。 In the first embodiment shown in FIGS. 1 to 4, 5 is
The LED is comprised of a pair of lead frames 1 and 2 as in the conventional example, an LED element 3 is mounted, and wires 4 are bonded. A total reflection lens 11 used in combination with the LED 5 is made of a light-transmitting resin and has a substantially horn-like overall shape, and has a through hole 12 in the center. The inner diameter of this through hole is formed to a size in which the LED 5 is approximately fitted.
The outer periphery of the side surface of the total reflection lens 11 is formed into a tapered surface 13 having a curved surface, and a part of the tapered surface, that is, the light emitting surface side is cut off to form the light emitting surface into a substantially square shape. The LED 5 and the total reflection lens 11 can be combined by forming both separately and inserting the LED 5 into the through hole 12, or by inserting the LED into the mold when molding the total reflection lens 11. It is also possible to form a single light source by molding it into a single light source.
このように合体されたLED５と全反射レンズ
１１との関係において、第２図及び第３図に示し
た通り、LED素子３から放射される光束の内、
球面部５ａでコントロールされたθ1の角度範囲の
光束は貫通孔１２からそのまま前面に略平行光線
として取り出され、LEDの側面側に放射される
光束の角度範囲θ2は全反射レンズ１１のテーパ面
１３により全反射されて略平行光線となつて前面
側に取り出される。従つて角形の発光面において
球面部５ａでコントロールされた光束とテーパ面
１３で反射した光束とが略均等に取り出されるこ
とになり発光面全体が略均等に光輝することにな
る。 In the relationship between the LED 5 and the total reflection lens 11 combined in this way, as shown in FIGS. 2 and 3, out of the luminous flux emitted from the LED element 3,
The luminous flux in the angular range of θ 1 controlled by the spherical part 5 a is extracted directly from the through hole 12 to the front surface as a substantially parallel ray, and the angular range θ 2 of the luminous flux radiated to the side surface of the LED is determined by the taper of the total reflection lens 11 The light is totally reflected by the surface 13 and becomes approximately parallel light rays, which are extracted to the front side. Therefore, on the rectangular light emitting surface, the light beam controlled by the spherical portion 5a and the light beam reflected by the tapered surface 13 are taken out substantially equally, and the entire light emitting surface shines substantially evenly.
このように構成されたLED光源体を複数個並
設して光源とする場合には、第４図に示したよう
に、例えば４個のLED光源体を四角形状に隣接
して組合せれば簡単に角形面光源が形成でき、し
かも各LED光源体の発光面全体が略均等に光輝
するので隣接LED光源体間に非発光面となる隙
間が全く生じないのである。 When a plurality of LED light source bodies configured in this way are arranged in parallel to form a light source, it is easy to combine, for example, four LED light source bodies adjacent to each other in a rectangular shape, as shown in Figure 4. A rectangular surface light source can be formed, and since the entire light emitting surface of each LED light source body shines substantially evenly, there is no gap between adjacent LED light source bodies that becomes a non-light emitting surface.
第５図及び第６図に示した第２実施例いにあつ
ては、全反射レンズの構成が異なるのみでLED
５は前記実施例と同じものが使用される。即ち全
反射レンズ１１ａは５連一体の全反射レンズであ
り、５個のLED５が夫々取付けられる部分に前
記実施例と同じように貫通孔１２ａ，１２ｂ，１
２ｃ，１２ｄ，１２ｅが形成されると共にテーパ
面１３ａ，１３ｂ，１３ｃ，１３ｄ，１３ｅも
夫々形成されるのである。従つてこの実施例にあ
つては前記第１実施例のLED光源体を５個横方
向に一連に接続されたような構成となつているの
である。 In the second embodiment shown in FIGS. 5 and 6, the only difference is the configuration of the total reflection lens, and the LED
5 is the same as in the previous embodiment. That is, the total reflection lens 11a is a total reflection lens of five units, and the through holes 12a, 12b, 1 are provided in the parts where the five LEDs 5 are respectively attached, as in the previous embodiment.
2c, 12d, and 12e are formed, and tapered surfaces 13a, 13b, 13c, 13d, and 13e are also formed, respectively. Therefore, this embodiment has a configuration in which five of the LED light source bodies of the first embodiment are connected in series in the lateral direction.
このように複数個の全反射レンズが一連に形成
されたものにあつては、ドツトマトリクスの光源
として用いる場合に最適である。即ち、一連の全
反射レンズ１１ａに対応するLED５を長尺の基
板１４に取付け、該基板には適宜のコネクター１
５を設けておき、これを第６図に示したように複
数列隣接させて並べ、箱状の取付枠１６に取付け
る。 A lens in which a plurality of total reflection lenses are formed in series in this way is most suitable for use as a dot matrix light source. That is, the LEDs 5 corresponding to the series of total reflection lenses 11a are attached to a long board 14, and an appropriate connector 1 is attached to the board.
5 are arranged in a plurality of adjacent rows as shown in FIG. 6, and attached to a box-shaped mounting frame 16.
この取付枠１６には前記コネクター１５に対応
するコネクター１７及び前記LED５の駆動回路
１８等の電子部品が設けてある回路基板１９が取
付けてあり、対応するコネクター１５，１７を連
結させるだけでドツトマトリクスが簡単に形成で
きるのである。 A connector 17 corresponding to the connector 15 and a circuit board 19 on which electronic components such as a drive circuit 18 for the LED 5 are installed are attached to the mounting frame 16. By simply connecting the corresponding connectors 15 and 17, a dot matrix can be installed. can be easily formed.
このように一連の全反射レンズ１１ａを使用し
ても、各LED５が取付けられる部分にはテーパ
面１３ａ〜１３ｅが設けられているので、各
LEDから放射される光束の内、球面部５ａでコ
ントロールされる光束は全部各貫通孔１２ａ〜１
２ｅから前面に取出され、側面に向う光束は夫々
各テーパ面１３ａ〜１３ｅで全反射されて前面側
に取出され、各LED毎に略四角形状の発光面が
形成されるのである。従つて全反射レンズ１１ａ
が一連に形成されていても各LED毎に四角形状
の発光面が独立して形成されることになるので、
各LED毎の遮光枠を全く必要としないのである。
いづれの実施例においても、発光面が角形を呈す
る全反射レンズを使用しているので、その発光面
を通常のLEDよりもはるかに大きくすることが
できると共にその照度も無駄な光束がなくなるた
めにアツプさせることができる。 Even if a series of total reflection lenses 11a are used in this way, since tapered surfaces 13a to 13e are provided in the portion where each LED 5 is attached, each
Of the luminous flux emitted from the LED, all the luminous flux controlled by the spherical part 5a is transmitted through each of the through holes 12a to 1.
The light beams emitted from 2e to the front side and directed toward the side surfaces are totally reflected by each of the tapered surfaces 13a to 13e and taken out to the front side, thereby forming a substantially rectangular light emitting surface for each LED. Therefore, the total reflection lens 11a
Even if LEDs are formed in series, each LED will have an independent rectangular light emitting surface.
There is no need for a light shielding frame for each LED at all.
In both examples, a total reflection lens with a rectangular light-emitting surface is used, so the light-emitting surface can be made much larger than that of a normal LED, and the illuminance is also improved because there is no wasted light flux. It can be raised.
以上説明したように本発明に係るLED光源体
は、丸形のレンズ部を有するLEDと側面がテー
パ状で発光面が角形のホーン状を呈する全反射レ
ンズとを合体させた構造であるため、LEDから
放射される光束で前面側に取出されない側面方向
の光束を前記テーパ面で全反射させて角形の発光
面を略均等に光輝させ照度アツプを図ることがで
きると共に、これらを多数個用いて角形面光源と
する場合にも、隣接LED間に隙間がなく非発光
部が生じなくなり無駄な光束もなくなるので視認
性に優れた光源を形成できるという優れた効果を
奏する。
As explained above, the LED light source according to the present invention has a structure in which an LED having a round lens portion is combined with a total reflection lens having a tapered side surface and a horn shape with a square light emitting surface. The luminous flux emitted from the LED in the side direction that is not taken out to the front side is totally reflected by the tapered surface, and the square light emitting surface can be illuminated almost uniformly to increase the illuminance. Even in the case of using a rectangular surface light source, there is no gap between adjacent LEDs, no non-light-emitting parts are generated, and there is no wasted light flux, resulting in the excellent effect of forming a light source with excellent visibility.
又、全反射レンズを用いることで発光面を大き
くすることができ、多数個のLEDを並べて角形
面光源とする場合に、その使用LED数を減せる
ので消費電力も低減させることができるという優
れた効果も奏する。 Additionally, by using a total reflection lens, the light emitting surface can be enlarged, and when many LEDs are lined up to form a rectangular surface light source, the number of LEDs used can be reduced, which is an advantage in reducing power consumption. It also has the same effect.
更に、複数の全反射レンズを一連に形成してド
ツトマトリクスの光源を構成した時に、各LED
が取付けられる部分の側面がテーパ面となつてお
り、各LED毎にテーパ面で全反射するため個々
のLEDが独立した角形の発光面となり、隣接同
志で別体の遮光枠等を必要としないばかりでな
く、太陽光等は入射角度にもよる発光面で反射し
てしまいテーパ面にまで届かないので疑似点灯現
象が生じなくなり、それによつても視認性が大に
なるという種々の優れた効果も奏する。 Furthermore, when a dot matrix light source is formed by forming a series of multiple total reflection lenses, each LED
The side surface of the part where it is attached is a tapered surface, and since each LED is totally reflected on the tapered surface, each LED becomes an independent square light emitting surface, and there is no need for a separate light-shielding frame etc. for adjacent LEDs. In addition, sunlight, etc., is reflected by the light emitting surface depending on the incident angle and does not reach the tapered surface, which eliminates the false lighting phenomenon, which also has various excellent effects such as increased visibility. Also plays.
第１図は本発明に係る第１実施例のLED光源
体の斜視図、第２図は第１図の−線に沿う断
面図、第３図は第１図の−線に沿う断面図、
第４図は同LED光源体を複数個隣接状態に並べ
て角形面光源とした場合の平面図、第５図は本発
明に係る第２実施例のLED光源体の斜視図、第
６図は同LED光源体を複数個使用してドツトマ
トリクスを形成した場合の斜視図、第７図は従来
例のLED側面図、第８図は同LEDを複数個使用
して角形面光源とした場合の平面図、第９図は同
LEDを多数個使用してドツトマトリクスを形成
した場合の一部断面斜視図である。
１，２……リードフレーム、３……LED素子、
４……ワイヤー、５……LED、１１，１１ａ…
…全反射レンズ、１２，１２ａ〜１２ｅ……貫通
孔、１３，１３ａ〜１３ｅ……テーパ面、１４…
…基板、１５，１７……コネクター、１６……取
付枠、１８……駆動回路、１９……回路基板。
1 is a perspective view of an LED light source according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a sectional view taken along the - line in FIG.
FIG. 4 is a plan view of a case where a plurality of the same LED light source bodies are arranged adjacently to form a rectangular surface light source, FIG. 5 is a perspective view of the LED light source body of the second embodiment of the present invention, and FIG. 6 is the same. A perspective view when a dot matrix is formed using multiple LED light sources, Figure 7 is a side view of a conventional LED, and Figure 8 is a plan view when multiple LEDs are used to form a rectangular surface light source. Figure 9 is the same.
FIG. 3 is a partially cross-sectional perspective view of a dot matrix formed using a large number of LEDs. 1, 2...Lead frame, 3...LED element,
4... Wire, 5... LED, 11, 11a...
...Total reflection lens, 12, 12a-12e...Through hole, 13, 13a-13e...Tapered surface, 14...
... Board, 15, 17 ... Connector, 16 ... Mounting frame, 18 ... Drive circuit, 19 ... Circuit board.
１ 発光素子をリードフレーム、ステム又は基板
上にマウントし、ワイヤーボンデイングすると共
に樹脂モールドしてレンズ部を形成した発光ダイ
オードに光透過性の材料で形成されたキヤツプを
被着させ、該キヤツプは正面視が角形で且つ中心
部に筒状の孔を設け、背面側をドーム状の曲面に
形成し、前記角形の各辺に沿つて側面をカツトす
ると共に角形の前面に多数個のレンズカツトを施
したことを特徴とする発光ダイオード。
２ キヤツプは光透過性の樹脂又はゴム材で形成
したことを特徴とする前記１項記載の発光ダイオ
ード。
1 A light-emitting element is mounted on a lead frame, stem, or substrate, and a cap made of a light-transmitting material is attached to the light-emitting diode, which has a lens portion formed by wire bonding and resin molding, and the cap is attached to the front side. The lens has a rectangular shape with a cylindrical hole in the center, the back side is formed into a dome-shaped curved surface, the side surfaces are cut along each side of the rectangle, and a large number of lens cuts are made on the front surface of the rectangle. A light emitting diode characterized by: 2. The light emitting diode according to item 1, wherein the cap is made of a light-transmitting resin or rubber material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60012069A JPS61171177A (en) | 1985-01-25 | 1985-01-25 | Led light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60012069A JPS61171177A (en) | 1985-01-25 | 1985-01-25 | Led light source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61171177A JPS61171177A (en) | 1986-08-01 |
| JPH0436589B2 true JPH0436589B2 (en) | 1992-06-16 |
Family
ID=11795313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60012069A Granted JPS61171177A (en) | 1985-01-25 | 1985-01-25 | Led light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61171177A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000019547A1 (en) * | 1998-09-25 | 2000-04-06 | Maxim Integrated Products, Inc. | Biconic reflector for collecting radiation from both top and side surfaces of led die |
| US20040264188A1 (en) * | 2001-09-11 | 2004-12-30 | Hare Tazawa | Condensing element and forming method threfor and condensing element-carrying led lamp and linear light emitting device using led lamp as light source |
| ES1058053Y (en) * | 2004-07-14 | 2005-02-01 | Fed Signal Vama Sa | INTERNAL REFLECTION COLIMATOR LENS |
| JP2007258059A (en) * | 2006-03-24 | 2007-10-04 | Matsushita Electric Works Ltd | Light-emitting device |
| JP5100823B2 (en) * | 2010-06-25 | 2012-12-19 | 日本航空電子工業株式会社 | Backlight assembly, backlight unit, and liquid crystal display device |
| US8944660B2 (en) | 2013-01-23 | 2015-02-03 | Ledil Oy | Light guide |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5315771B2 (en) * | 1973-11-14 | 1978-05-27 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5238923Y2 (en) * | 1973-02-20 | 1977-09-03 | ||
| JPS5315771U (en) * | 1976-07-21 | 1978-02-09 |
-
1985
- 1985-01-25 JP JP60012069A patent/JPS61171177A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5315771B2 (en) * | 1973-11-14 | 1978-05-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61171177A (en) | 1986-08-01 |
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