JP5549104B2 - 発光装置、光走査装置及び画像形成装置 - Google Patents
発光装置、光走査装置及び画像形成装置 Download PDFInfo
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- JP5549104B2 JP5549104B2 JP2009097118A JP2009097118A JP5549104B2 JP 5549104 B2 JP5549104 B2 JP 5549104B2 JP 2009097118 A JP2009097118 A JP 2009097118A JP 2009097118 A JP2009097118 A JP 2009097118A JP 5549104 B2 JP5549104 B2 JP 5549104B2
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Description
上方に向け開口する開口部が設けられ、前記面発光レーザを搭載するための金属よりなる搭載部が前記開口部の底面に設けられ、前記面発光レーザの前記共通電極が前記搭載部と電気的に接続されるセラミックパッケージとを備える発光装置であって、
前記セラミックパッケージは、該セラミックパッケージの下面の周縁に設けられた裏面電極と、前記下面の中央に設けられた裏面放熱電極とを有し、
前記共通電極が電気的に接続された前記搭載部は、前記セラミックパッケージに設けられた共通電極引出配線を介して前記裏面電極のうちグラウンドに接続された裏面電極と電気的に接続されると共に、前記セラミックパッケージの前記開口部の前記底面と前記セラミックパッケージの前記下面との間を貫通する貫通電極を介して前記裏面放熱電極と熱的に接続され、
前記貫通電極は、前記搭載部の部分であって前記面発光レーザが搭載されない部分の下側に複数設けられ、
さらに、前記貫通電極は、前記セラミックパッケージの基板底部を貫通して設けられていることを特徴とする。
(第1の実施の形態)
図1乃至図4を参照し、本発明の第1の実施の形態に係る発光装置を説明する。
(第1の実施の形態の第1の変形例)
次に、図8(a)乃至図9を参照し、本発明の第1の実施の形態の第1の変形例に係る発光装置を説明する。
(第1の実施の形態の第2の変形例)
次に、図10乃至図12を参照し、本発明の第1の実施の形態の第2の変形例に係る発光装置を説明する。
(第1の実施の形態の第3の変形例)
次に、図13を参照し、本発明の第1の実施の形態の第3の変形例に係る発光装置を説明する。
(第2の実施の形態)
次に、図14及び図15を参照し、本発明の第2の実施の形態に係る光走査装置を説明する。
(第3の実施の形態)
次に、図16を参照し、本発明の第3の実施の形態に係る画像形成装置を説明する。
11 面発光レーザ素子
12 個別電極
13 共通電極
20、20a、20b セラミックパッケージ
21 パッケージ基体
22 開口部
23 パッケージ蓋体
24 基板底部
25 基板堤部
26 開口部底面
31 搭載部
32、32a 裏面電極
33、33b 裏面放熱電極
34 個別電極引出配線
35 共通電極引出配線
36、36a、36b 貫通電極
40、40b、40c プリント基板
41 プリント基板基体
42 プリント基板表面電極
43、43b プリント基板表面放熱電極
44 プリント基板裏面放熱電極
45 プリント基板貫通電極
46 半田(ハンダ)
47 アンダーフィル材(アンダーフィル剤)
48 ヒートシンク
49 フィン
50、50a、50b、50c 発光装置
110 光源ユニット
114 ポリゴンミラー(偏向手段)
115 fθレンズ(走査光学系の一部)
116 トロイダルレンズ
500 レーザプリンタ
900 光走査装置
901 感光体ドラム(像担持体)
903 現像ローラ(転写手段の一部)
911 転写チャージャ
Claims (9)
- 上面に複数の個別電極が設けられ、下面に一つの共通電極が設けられる面発光レーザと、
上方に向け開口する開口部が設けられ、前記面発光レーザを搭載するための金属よりなる搭載部が前記開口部の底面に設けられ、前記面発光レーザの前記共通電極が前記搭載部と電気的に接続されるセラミックパッケージとを備える発光装置であって、
前記セラミックパッケージは、該セラミックパッケージの下面の周縁に設けられた裏面電極と、前記下面の中央に設けられた裏面放熱電極とを有し、
前記共通電極が電気的に接続された前記搭載部は、前記セラミックパッケージに設けられた共通電極引出配線を介して前記裏面電極のうちグラウンドに接続された裏面電極と電気的に接続されると共に、前記セラミックパッケージの前記開口部の前記底面と前記セラミックパッケージの前記下面との間を貫通する貫通電極を介して前記裏面放熱電極と熱的に接続され、
前記貫通電極は、前記搭載部の部分であって前記面発光レーザが搭載されない部分の下側に複数設けられ、
さらに、前記貫通電極は、前記セラミックパッケージの基板底部を貫通して設けられていることを特徴とする発光装置。 - 前記共通電極引出配線は、前記セラミックパッケージの前記開口部の前記底面から前記セラミックパッケージの側面へ引き出され、更に該側面の下端を回り込んで前記セラミックパッケージの前記下面へ引き回されることを特徴とする請求項1記載の発光装置。
- 前記裏面放熱電極は、前記セラミックパッケージの前記下面において略全面に亘り形成されることを特徴とする請求項1又は2記載の発光装置。
- 平面視において前記貫通電極と前記面発光レーザとは0.2mm以上離れていることを特徴とする請求項1乃至3何れか一項に記載の発光装置。
- 前記裏面放熱電極は、複数に分割して設けられ、前記複数に分割された前記裏面放熱電極の各々は、前記貫通電極を介して前記搭載部と熱的に接続されることを特徴とする請求項1乃至4何れか一項に記載の発光装置。
- 前記セラミックパッケージがプリント基板にハンダつけされ、前記複数に分割された前記裏面放熱電極及び前記セラミックパッケージの下面の周縁に設けられた裏面電極の間隙部にアンダーフィル剤が充填されることを特徴とする請求項5に記載の発光装置。
- 前記裏面放熱電極にヒートシンクが設置されることを特徴とする請求項1乃至6何れか一項に記載の発光装置。
- 被走査面上で光を走査する光走査装置において、
請求項1乃至7何れか一項に記載の発光装置と、
前記発光装置で発光された光を偏向する偏向器と、
前記偏向器で偏向された光を前記被走査面上に集光する走査光学系とを備える光走査装置。 - 請求項8記載の光走査装置と、
前記光走査装置により光が走査される前記被走査面を備える少なくとも一つの像担持体とを備え、
前記光走査装置は、前記像担持体の前記被走査面上で画像情報が含まれる光を走査し、前記像担持体の前記被走査面上に画像を形成することを特徴とする画像形成装置。
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