JP2009111068A - 発光装置 - Google Patents
発光装置 Download PDFInfo
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- JP2009111068A JP2009111068A JP2007280449A JP2007280449A JP2009111068A JP 2009111068 A JP2009111068 A JP 2009111068A JP 2007280449 A JP2007280449 A JP 2007280449A JP 2007280449 A JP2007280449 A JP 2007280449A JP 2009111068 A JP2009111068 A JP 2009111068A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
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- 239000004954 Polyphthalamide Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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Abstract
【解決手段】本発明の発光装置10は、発光素子30と、発光素子30と接続された接続用端子21a、12bと、発光素子30を載置する凹部40を備えかつ接続用端子21a、12bの一部22a、22bを外部に突出させてなるパッケージ12と、を備えており、凹部40の開口部41が一方向に長くなっており、凹部40の長手方向の両側側壁が傾斜面43となっており、2つの傾斜面43を延長したときに該2つの傾斜面43のなす角度θが90°以上であることを特徴とする。本発明の発光装置10では、発光素子30からの光が開口部41の長手方向に十分に広がって帯状の発光になる。よって、導光板71の入射面72の長手方向に沿って複数の発光装置10を配置して面発光装置70を形成したとき、隣接する発光装置10間に暗部が生じにくく、輝度ムラを抑えることができる。
【選択図】図1
Description
別の輝度ムラの解消方法としては、パッケージに入っていない発光素子を導光板の入射面の長手方向に沿って多数配置する方法があるが、1つの導光板に必要とされる発光素子の個数が増大してコストが高くなる問題がある。
図1及び図2は本実施の形態に係るサイドビュータイプの発光装置10を示し、図3〜図6は本実施の形態の発光装置10に使用されるパッケージ12が、リードフレーム20から切り離される前の状態を示している。発光装置10は、凹部40を有するパッケージ12を備えており、この凹部40の内部に発光素子30が配置されている。また、凹部40の底面42には接続用端子としてリード電極21a、21bが露出し、その一部がパッケージ12を貫通して外部に突出している。発光素子30とリード電極21a、21bとは、導電ワイヤ80によって接続されている。
なお、発光素子30及び導電ワイヤ80を外部環境から保護するために、パッケージ12の凹部40を透光性の封止樹脂によって封止してもよい。
そこで、リード電極21aを底面42から傾斜面43の下側までx方向に沿って延ばして(図3及び図4参照)、そこから外部端子22aを実装面16から突出させると、側壁44の強度低下が回避できるので好ましい(図6参照)。
さらに、パッケージ12のx方向の外側面18(図3及び図4参照)に近い位置から外部端子22aを突出させるとより好ましい。
まず、金属平板に打ち抜き加工を施して、その表面に金属メッキを施してリードフレーム20を作製する。リードフレーム20は、隙間をあけて対向した一対のリード電極21a、21bを有している。通常は、1枚のリードフレーム20に、複数のリード電極21a、21bの対を形成する。
まず、パッケージ12の凹部40内に発光素子30を固定する。凹部40の底面42に露出したリード電極12aの一方に発光素子30をダイボンドする。次いで、発光素子30の正極及び負極と、リード電極21a、21bとを、導電ワイヤ80でワイヤボンディングする。その後、必要に応じて透光性の封止樹脂により凹部40を封止してもよい。また、封止樹脂に、蛍光体やフィラーを混入することもできる。
(発光素子30)
発光素子30には、発光ダイオード等の半導体発光素子が好適である。また、発光素子30は、様々な発光波長のものが使用できる。
リード電極21a、21bの材料は、導電性であれば特に限定されないが、例えば鉄、銅、鉄入り銅、錫入り銅及び銅、金、銀をメッキしたアルミニウム、鉄、銅等が好適である。
パッケージ12の成形材料には、例えば、液晶ポリマー、ポリフタルアミド樹脂、ポリブチレンテレフタレート(PBT)などの熱可塑性樹脂を用いることができる。特に、ポリフタルアミド樹脂のような高融点結晶を含有する半結晶性ポリマー樹脂は、表面エネルギーが大きく、パッケージ12の凹部40に充填する封止樹脂との密着性が良好であるので、好適である。これにより、封止樹脂を充填し硬化する工程において、樹脂の冷却過程の間にパッケージと封止樹脂との界面が剥離しにくくなる。また、パッケージ12が発光素子30からの光を効率よく反射できるように、成形部材中に酸化チタンなどの白色顔料などを混合してもよい。
ワイヤボンディング用の導電ワイヤ80としては、例えば、金線、銅線、白金線、アルミニウム線等の金属及びそれらの合金から成るワイヤを用いることが出来る。
上述の実施の形態1では、パッケージ12の実装面16に形成した段部52(図2参照)は、リード電極21a、21bの外部端子22a、22bを背面15側に折り曲げた際に、外部端子22a、22bを収納できるように形成されている。よって、外部端子22a、22bがパッケージ12から突出した位置よりも発光面14側には、段部52は形成されていない。
本実施の形態では、外部端子22a、22bがパッケージ12から突出した位置から発光面14側にも、段部52を形成している点で実施の形態1と異なる(図10参照)。それ以外の構成は、実施の形態1と同様である。
シミュレーションを行った4種類の発光装置10(実施例1〜4)の寸法は表1の通りである。
図12A〜12Dからわかるように、比較例1〜4の発光装置では、光は約4mmの範囲に広がるのみであり、開口部の長さL1全体にわたって広がっていない。これに対して、実施例1〜4の発光装置では、開口部の長さL1のほぼ全体にわたって光が広がっている。よって、本発明の発光装置10は、光が開口部の長手方向に広がって、帯状の発光になることがわかる。
Claims (10)
- 発光素子と、
前記発光素子と接続された接続用端子と、
前記発光素子を載置する凹部を備え、かつ前記接続用端子の一部を外部に突出させてなるパッケージと、を備えており、
前記凹部の開口部が一方向に長くなっており、
前記凹部の長手方向の両側側壁が傾斜面となっており、2つの傾斜面を延長したときに該2つの傾斜面のなす角度θが90°以上であることを特徴とする発光装置。 - 前記2つの傾斜面のなす角度θが、135°〜165°であることを特徴とする請求項1に記載の発光装置。
- 前記一方向の前記開口部の長さL1が、前記一方向の前記底面の長さL3の2〜4倍であることを特徴とする請求項1又は2に記載の発光装置。
- 前記一方向の前記開口部の長さL1が、前記一方向と直交する方向における前記開口部の長さL4の7〜24倍であることを特徴とする請求項1乃至3のいずれか1項に記載の発光装置。
- 前記開口部から前記底面までの深さdが、前記一方向の前記底面の長さL3の0.2〜0.4倍であることを特徴とする請求項1乃至4のいずれか1項に記載の発光装置。
- 最大傾斜方向の前記傾斜面の長さが、前記一方向の前記底面の長さよりも長いことを特徴とする請求項1乃至5のいずれか1項に記載の発光装置。
- 前記パッケージの外面には、前記開口部が形成された発光面と対向した背面側に切欠き部が形成されており、
前記切欠き部に、前記接続用端子が配置されていることを特徴とする請求項1乃至6のいずれか1項に記載の発光装置。 - 前記接続用端子が前記パッケージの外面より内方に位置することを特徴とする請求項7に記載の発光装置。
- 導光板と複数の発光装置を備えた面発光装置において、前記発光装置は請求項1乃至8のいずれか1項に記載の発光装置であって、前記導光板の入射面に前記各開口部が対向するように前記一方向に配列されており、
隣接する発光装置間において、その2つの発光装置から出射される光が重なって前記導光板内に入射されることを特徴とする面発光装置。 - 発光素子が実装される底面を有する凹部が形成された発光装置用パッケージにおいて、
前記パッケージは、前記底面に露出して発光素子に接続し、前記底面と同一面内で前記パッケージを貫通する接続用端子を有し、
前記凹部の開口部が一方向に長くなっており、
前記底面の前記一方向の両側側面が傾斜面となっており、2つの傾斜面を延長したときに該2つの傾斜面のなす角度θが90°以上であることを特徴とする発光装置用パッケージ。
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