JP2003100131A - Surface light emitting device - Google Patents
Surface light emitting deviceInfo
- Publication number
- JP2003100131A JP2003100131A JP2001285461A JP2001285461A JP2003100131A JP 2003100131 A JP2003100131 A JP 2003100131A JP 2001285461 A JP2001285461 A JP 2001285461A JP 2001285461 A JP2001285461 A JP 2001285461A JP 2003100131 A JP2003100131 A JP 2003100131A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- light guide
- emitting element
- emitting device
- 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
Abstract
Description
【発明の属する技術分野】本発明は、携帯電話などの携
帯機器類の表示部を照明するために使用される面発光装
置に関し、特に、発光ダイオードなど発光面積が微小な
発光素子を用いた面発光装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light emitting device used for illuminating a display portion of portable equipment such as a mobile phone, and more particularly to a surface light emitting device such as a light emitting diode using a light emitting element having a small light emitting area. The present invention relates to a light emitting device.
【従来の技術】図６は従来の面発光装置を示し、（ａ）
は平面図、（ｂ）は（ａ）のＤ−Ｄ線断面図、図７は図
６の面実装ＬＥＤの詳細を示し、（ａ）は平面図、
（ｂ）は縦断面図である。図６に示すように従来の面発
光装置２１は、面実装ＬＥＤ２２を導電性ペースト２３
にて接続している。使用する面実装ＬＥＤ２２は、図７
に示すように、外装ケース２４の内部に搭載された発光
素子２７より発する光を外装ケース２４の内壁２５に反
射させ、面実装ＬＥＤ２２の発光方向へより多くの光を
照射させることにより輝度を高めている。2. Description of the Related Art FIG. 6 shows a conventional surface emitting device.
Is a plan view, (b) is a sectional view taken along the line D-D of (a), FIG. 7 shows the details of the surface-mounted LED of FIG. 6, (a) is a plan view,
(B) is a longitudinal sectional view. As shown in FIG. 6, in the conventional surface emitting device 21, the surface mounting LED 22 is connected to the conductive paste 23.
It is connected with. The surface mount LED 22 used is shown in FIG.
As shown in, the light emitted from the light emitting element 27 mounted inside the outer case 24 is reflected on the inner wall 25 of the outer case 24, and more light is emitted in the light emitting direction of the surface-mounted LED 22 to increase the brightness. ing.
【発明が解決しようとする課題】しかしながら、従来の
面発光装置２１は、面実装ＬＥＤ２２などの光源と導光
板２６との間に空間（空気層）２９が存在しているた
め、光源が発した光が導光板２６に入射するまでの間で
光量が減衰し、導光板２６の発光面の輝度を低下させて
いる。また、面実装ＬＥＤ２２から発せられた光の放射
角が狭いため、光放出部２８から放出される光に輝度む
らが発生するという問題がある。本発明は、このような
面発光装置において、発光素子側面から発せられる光を
有効に利用することにより発光面の輝度を高め、光放出
部の輝度むらを低減させることを目的とする。However, in the conventional surface emitting device 21, since the space (air layer) 29 exists between the light source such as the surface mount LED 22 and the light guide plate 26, the light source emits light. The amount of light is attenuated until the light enters the light guide plate 26, and the brightness of the light emitting surface of the light guide plate 26 is reduced. Further, since the emission angle of the light emitted from the surface mount LED 22 is narrow, there is a problem that the light emitted from the light emitting portion 28 has uneven brightness. An object of the present invention is to increase the brightness of the light emitting surface and reduce the brightness unevenness of the light emitting portion by effectively utilizing the light emitted from the side surface of the light emitting element in such a surface emitting device.
【課題を解決するための手段】本発明の面発光装置は、
発光素子が発する光を導入する導光部と前記導光部から
入射した光を放出する光放出部とを有する導光板と、前
記導光板の導光部に近接して配置された発光素子とを備
えた面発光装置において、前記導光部と前記発光素子と
の間に導光用透明樹脂を介在させたものである。本発明
によれば、面発光装置の発光面輝度を高め、導光板の光
放出部における輝度むらを低減させ、均一な発光面を得
ることができる。The surface emitting device of the present invention comprises:
A light guide plate having a light guide part for introducing light emitted by the light emitting element and a light emitting part for emitting light incident from the light guide part; and a light emitting element arranged in proximity to the light guide part of the light guide plate. In a surface light emitting device including: a light guide transparent resin interposed between the light guide section and the light emitting element. According to the present invention, it is possible to increase the brightness of the light emitting surface of the surface light emitting device, reduce the uneven brightness in the light emitting portion of the light guide plate, and obtain a uniform light emitting surface.
【発明の実施の形態】請求項１に記載の発明は、発光素
子が発する光を導入する導光部と前記導光部から入射し
た光を放出する光放出部とを有する導光板と、前記導光
板の導光部に近接して配置された発光素子とを備えた面
発光装置において、前記導光部と前記発光素子との間に
導光用透明樹脂を介在させたものであり、発光素子が発
する光を当該導光用透明樹脂が効率良く導光板の導光部
へ伝播させるという作用を有する。請求項２に記載の発
明は、前記導光部として、前記導光板の周縁の一部に前
記発光素子を収納可能な凹状導光部を形成し、前記発光
素子を前記凹部内に配置するとともに前記凹部と発光素
子との間に導光用透明樹脂を充填したものであり、発光
素子が発する光を当該導光用透明樹脂が効率良く導光板
内へ伝播させるという作用を有するほか、発光素子の側
面より発する光を放射状に伝播させ、導光板の光放出部
の輝度むらを低減させるという作用を有する。請求項３
に記載の発明は、前記導光用透明樹脂として、シリコー
ン系であって高透過率の熱硬化性の樹脂を用いたもので
あり、発光素子から発せられた光を効率良く導光板へ伝
播するとともに発光素子より発する熱の放射効率を高め
るという作用を有する。以下、本発明の実施の形態につ
いて、図１から図５を用いて説明する。図１は実施の形
態である面発光装置を組み立て完成状態で示す平面図、
図２は図１の面発光装置を拡散シート、レンズフィルム
および保護シートを取り外した状態で示す平面図、図３
は図２におけるＢ部拡大図、図４は図１におけるＡ−Ａ
線断面図、図５は図４におけるＣ部拡大図である。図１
〜５において、１は面発光装置、２はホルダ、３は保護
シート、４は発光領域、５はＦＰＣ基板、６は導光用透
明樹脂、７は発光素子、８は導電性ペースト、９はＡｕ
ワイヤ、１０は導光板、１１は反射シート、１２は拡散
シート、１３はレンズフィルムである。面発光装置１に
おいては、発光素子７が発する光を導光板１０に導入す
るための導光部として、導光板１０の辺縁に複数の凹状
導光部１４が形成され、それぞれの凹状導光部１４内
に、ＦＰＣ基板５に導電性ペースト８でダイボンディン
グされ、Ａｕワイヤ９がボンディングされた発光素子７
が収納され、凹状導光部１４と発光素子７との間に導光
用透明樹脂６が充填されている。また、拡散シート１２
は、導光板１０の光放出部１５より放出された光を拡散
させ、発光領域全体の輝度むらを低減させる。レンズフ
ィルム１３は、拡散シート１２によって拡散させた発光
領域４内の光を集光し、発光領域４部の正面輝度を高め
る。保護シート３は、発光素子の側面からの光、特に光
放出部１５と同一方向へ発せられる光を凹状導光部１４
へ反射させ、光の導光効率を高めるとともに、拡散シー
ト１２およびレンズフィルム１３とホルダ２とを固定す
ることを目的とするものである。このような構成とする
ことにより、発光素子７が発した光は、導光用透明樹脂
６内を伝播して凹状導光部１４から導光板１０へ入射
し、導光板１０内を面方向へ伝播しながら表面の光放出
部１５から外へ放出されるため、発光領域４が明るく照
らし出される。このように、発光素子７が発した光は導
光用透明樹脂６によって効率良く導光板１０の凹状導光
部１４へ伝播されるので、発光素子７と導光板１０との
間に空気層が介在する場合に比べ、減衰が極めて少な
く、高い輝度が得られる。また、凹状導光部１４内に発
光素子７を配置して導光用透明樹脂６を充填した構造と
することにより、発光素子７の側面より発せられた光も
効率良く伝播されるため、光放出部１５の輝度むらを低
減させることができる。また、本実施形態では、導光用
透明樹脂６として、シリコーン系の高透過率の熱硬化性
樹脂を用いているため、発光素子７が光を発する際に発
生する熱を放射させ、熱ストレスに対する信頼性の向上
という優れた効果が得られる。なお、導光用透明樹脂６
としては、この他にエポキシ系樹脂などを採用すること
もでき、同様の機能、効果が得られる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a light guide plate having a light guide portion for introducing light emitted from a light emitting element and a light emitting portion for emitting light incident from the light guide portion; In a surface emitting device including a light emitting element arranged in proximity to a light guide portion of a light guide plate, a light guide transparent resin is interposed between the light guide portion and the light emitting element. The transparent resin for light guide has an effect that the light emitted from the element is efficiently propagated to the light guide portion of the light guide plate. In the invention according to claim 2, as the light guide portion, a concave light guide portion capable of accommodating the light emitting element is formed in a part of a peripheral edge of the light guide plate, and the light emitting element is arranged in the recess. A transparent resin for light guiding is filled between the recess and the light emitting element, and in addition to having the function of allowing the transparent resin for light guiding to efficiently propagate into the light guide plate, the light emitting element The light emitted from the side surface of the light guide plate is radially propagated to reduce the uneven brightness of the light emitting portion of the light guide plate. Claim 3
The invention described in (1) uses a silicone-based thermosetting resin having a high transmittance as the transparent resin for light guide, and efficiently propagates the light emitted from the light emitting element to the light guide plate. At the same time, it has an effect of increasing the radiation efficiency of heat generated from the light emitting element. Embodiments of the present invention will be described below with reference to FIGS. 1 to 5. FIG. 1 is a plan view showing the surface emitting device according to the embodiment in an assembled and completed state,
2 is a plan view showing the surface emitting device of FIG. 1 with a diffusion sheet, a lens film and a protective sheet removed.
2 is an enlarged view of part B in FIG. 2, and FIG. 4 is AA in FIG.
FIG. 5 is an enlarged view of part C in FIG. Figure 1
1 to 5, 1 is a surface emitting device, 2 is a holder, 3 is a protective sheet, 4 is a light emitting area, 5 is an FPC substrate, 6 is a transparent resin for light guiding, 7 is a light emitting element, 8 is a conductive paste, and 9 is Au
Wires, 10 are light guide plates, 11 is a reflection sheet, 12 is a diffusion sheet, and 13 is a lens film. In the surface light emitting device 1, a plurality of concave light guide portions 14 are formed at the edges of the light guide plate 10 as light guide portions for introducing the light emitted from the light emitting elements 7 into the light guide plate 10, and the respective concave light guide portions are formed. In the portion 14, the FPC board 5 is die-bonded with the conductive paste 8 and the Au wire 9 is bonded to the light-emitting element 7.
And the transparent resin 6 for light guiding is filled between the concave light guiding portion 14 and the light emitting element 7. In addition, the diffusion sheet 12
Diffuses the light emitted from the light emitting portion 15 of the light guide plate 10 and reduces the uneven brightness of the entire light emitting region. The lens film 13 collects the light in the light emitting area 4 diffused by the diffusion sheet 12 and enhances the front luminance of the light emitting area 4. The protective sheet 3 allows the light from the side surface of the light emitting element, particularly the light emitted in the same direction as the light emitting portion 15, to be concave.
It is intended to fix the diffusion sheet 12 and the lens film 13 to the holder 2 while reflecting the light to improve the light guiding efficiency. With such a configuration, the light emitted from the light emitting element 7 propagates in the transparent resin 6 for light guide, enters the light guide plate 10 from the concave light guide portion 14, and moves in the surface direction in the light guide plate 10. Since the light is emitted from the light emitting portion 15 on the surface while propagating, the light emitting region 4 is illuminated brightly. In this way, the light emitted from the light emitting element 7 is efficiently propagated to the concave light guiding portion 14 of the light guide plate 10 by the light guiding transparent resin 6, so that an air layer is formed between the light emitting element 7 and the light guide plate 10. Compared with the case of interposing, the attenuation is extremely small, and high brightness can be obtained. Further, by arranging the light emitting element 7 in the concave light guiding portion 14 and filling the transparent resin 6 for light guiding, the light emitted from the side surface of the light emitting element 7 is also efficiently propagated, It is possible to reduce the brightness unevenness of the emitting portion 15. Further, in the present embodiment, since a silicone-based thermosetting resin having a high transmittance is used as the transparent resin 6 for light guide, heat generated when the light emitting element 7 emits light is radiated, and thermal stress is generated. The excellent effect of improving reliability is obtained. The transparent resin for light guide 6
Other than this, an epoxy resin or the like can be adopted, and similar functions and effects can be obtained.
【発明の効果】請求項１記載の発明によれば、発光面の
輝度を高めることができるという有利な効果が得られ
る。請求項２記載の発明によれば、発光素子の側面から
の光を有効利用できるため、発光面からの輝度むらを低
減するという有利な効果が得られる。請求項３記載の発
明によれば、発光素子が光を発する際の熱を放射するこ
とにより、信頼性を高めるという有利な効果が得られ
る。According to the invention described in claim 1, the advantageous effect that the brightness of the light emitting surface can be increased can be obtained. According to the second aspect of the invention, since the light from the side surface of the light emitting element can be effectively used, the advantageous effect of reducing the uneven brightness from the light emitting surface can be obtained. According to the third aspect of the present invention, the light emitting element emits heat when it emits light, so that an advantageous effect of improving reliability can be obtained.
【図１】実施の形態である面発光装置を組み立て完成状
態で示す平面図FIG. 1 is a plan view showing an embodiment of a surface emitting device in an assembled state.
【図２】図１の面発光装置を拡散シート、レンズフィル
ムおよび保護シートを取り外した状態で示す平面図FIG. 2 is a plan view showing the surface emitting device of FIG. 1 with a diffusion sheet, a lens film and a protective sheet removed.
【図３】図２におけるＢ部拡大図FIG. 3 is an enlarged view of part B in FIG.
【図４】図１におけるＡ−Ａ線断面図FIG. 4 is a sectional view taken along the line AA in FIG.
【図５】図４におけるＣ部拡大図5 is an enlarged view of part C in FIG.
【図６】従来の面発光装置を示し、 （ａ）は平面図 （ｂ）は（ａ）のＤ−Ｄ線断面図FIG. 6 shows a conventional surface emitting device, (A) is a plan view (B) is the DD sectional view taken on the line of (a).
【図７】図６の面実装ＬＥＤの詳細を示し、 （ａ）は平面図 （ｂ）は縦断面図7 shows details of the surface mount LED of FIG. (A) is a plan view (B) is a vertical sectional view
１ 面発光装置 ２ ホルダ ３ 保護シート ４ 発光領域 ５ ＦＰＣ基板、 ６ 導光用透明樹脂 ７ 発光素子 ８ 導電性ペースト ９ Ａｕワイヤ １０ 導光板 １１ 反射シート １２ 拡散シート １３ レンズフィルム １４ 凹状導光部 １５ 光放出部 1 surface emitting device 2 holder 3 protection sheet 4 light emitting area 5 FPC board, 6 Transparent resin for light guide 7 Light emitting element 8 Conductive paste 9 Au wire 10 Light guide plate 11 Reflective sheet 12 Diffusion sheet 13 lens film 14 Concave light guide 15 Light emitting part
フロントページの続き (72)発明者 徳冨 眞治 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 5G435 AA03 EE23 EE26 FF03 FF08 FF12 GG25 Continued front page (72) Inventor Shinji Tokutomi 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd. F term (reference) 5G435 AA03 EE23 EE26 FF03 FF08 FF12 GG25
Claims (3)
前記導光部から入射した光を放出する光放出部とを有す
る導光板と、前記導光板の導光部に近接して配置された
発光素子とを備えた面発光装置において、前記導光部と
前記発光素子との間に導光用透明樹脂を介在させたこと
を特徴とする面発光装置。1. A light guide plate having a light guide part for introducing light emitted from a light emitting element and a light emitting part for emitting light incident from the light guide part, and arranged in proximity to the light guide part of the light guide plate. In a surface light emitting device including the light emitting element, a surface light emitting device, wherein a light guiding transparent resin is interposed between the light guide portion and the light emitting element.
一部に前記発光素子を収納可能な凹状導光部を形成し、
前記発光素子を前記凹部内に配置するとともに前記凹部
と前記発光素子との間に導光用透明樹脂を充填した請求
項１記載の面発光装置。2. As the light guide portion, a concave light guide portion capable of accommodating the light emitting element is formed in a part of a peripheral edge of the light guide plate,
The surface emitting device according to claim 1, wherein the light emitting element is arranged in the recess and a light guiding transparent resin is filled between the recess and the light emitting element.
系の高透過率の熱硬化性樹脂を用いた請求項１または２
記載の面発光装置。3. The thermosetting resin having a high transmittance of silicone is used as the transparent resin for light guide.
The surface emitting device described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001285461A JP2003100131A (en) | 2001-09-19 | 2001-09-19 | Surface light emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001285461A JP2003100131A (en) | 2001-09-19 | 2001-09-19 | Surface light emitting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003100131A true JP2003100131A (en) | 2003-04-04 |
Family
ID=19108609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001285461A Pending JP2003100131A (en) | 2001-09-19 | 2001-09-19 | Surface light emitting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003100131A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007053063A (en) * | 2005-08-19 | 2007-03-01 | Citizen Electronics Co Ltd | Sheet switch module |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08315621A (en) * | 1995-05-23 | 1996-11-29 | Sharp Corp | Surface light system and indicator using it |
| JPH1153919A (en) * | 1997-08-04 | 1999-02-26 | Sanken Electric Co Ltd | Semiconductor planar light source |
-
2001
- 2001-09-19 JP JP2001285461A patent/JP2003100131A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08315621A (en) * | 1995-05-23 | 1996-11-29 | Sharp Corp | Surface light system and indicator using it |
| JPH1153919A (en) * | 1997-08-04 | 1999-02-26 | Sanken Electric Co Ltd | Semiconductor planar light source |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007053063A (en) * | 2005-08-19 | 2007-03-01 | Citizen Electronics Co Ltd | Sheet switch module |
| JP4728067B2 (en) * | 2005-08-19 | 2011-07-20 | シチズン電子株式会社 | Seat switch module |
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