JP7373030B1 - 光学デバイス、及び光学デバイスの製造方法 - Google Patents
光学デバイス、及び光学デバイスの製造方法 Download PDFInfo
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Abstract
Description
例えば、大きな光学機能領域を有する光学素子を、小さな光学領域を有する光学素子に対応した金型を用いて樹脂で封止すると、大きな光学機能領域の一部が樹脂で覆われてしまう。
開口部の一部には、樹脂部を貫通し、配線基板の一部の表面を露出させる貫通部が設けられており、貫通部から露出された配線基板に発光素子が設けられている。このため、発光素子から出射した光を、開口部の貫通部を介して光学デバイスの外部に設けられた照射対象へ照射することができる。
樹脂封止工程で用いるモールド金型は、封止用の樹脂が充填される凹状のキャビティ部を有している。
図1~図6を用いて、本発明の第1実施形態に係る光学デバイス10について説明する。なお、以下の説明における上下の区別は便宜的なものであり、実際に光学デバイスが使用されるときの上下を限定するものではない。
本実施形態では、便宜上、図面の矢印U方向側を上側、図面の矢印D方向側を下側、図面の矢印L方向側を左側、図面の矢印R方向側を右側、図面の矢印F方向側を前側、図面の矢印B方向側を後側とする。また、図面の矢印U方向を上方向、図面の矢印D方向を下方向、図面の矢印L方向を左方向、図面の矢印R方向を右方向、図面の矢印F方向を前方向、図面の矢印B方向を後方向と呼ぶ。
図1、及び図2(A),(B)に示すように、本実施形態の光学デバイス10は、配線基板12、光学素子14、発光素子16、封止用の樹脂で形成された樹脂部18等を含んで構成されており、いわゆる反射型のフォトインタラプタとして構成されており、一例としてエンコーダ等に使用されるものである。
受光部22は、その長手方向が、光学素子14の矢印F方向側の辺に沿って平行とされている。図3(B)に示すように、本実施形態の受光部22には、複数の画素の一例としてのフォトダイオード22Aが、受光部22の長手方向に沿って等間隔で配置されている。言い換えれば、本実施形態の受光部22は、ラインセンサとして機能するものである。
なお、配線基板12の上面から立ち上がっている底面30を有した樹脂部分は、本発明の光学素子周囲部の一例である。
図3(A)において、2点鎖線は、長さ、及び幅を大きくした受光部22を示している。
言い換えれば、開口部28の内部において、受光部22の長手方向側に位置する樹脂部18の厚さA[W0-W1]を、受光部22の幅方向側に位置する樹脂部18の受光部22の幅方向に沿って計測する厚さB[(L0-L1)/2]よりも大きく設定している。
図2、及び図4には、光学デバイス10の樹脂部18を形成するためのモールド金型40が断面図にて示されている。
以上の工程を経ることで、図1に示す光学デバイス10が出来上がる。
本実施形態の光学デバイス10では、発光素子16から出射した光を、開口部28の貫通部32(図2(B)、図3(A)参照)を介して外部に設けられた照射対象(図示せず)に向けて出射し、照射対象で反射した反射光を光学素子14の受光部22で受光することができる。
なお、本実施形態の光学デバイス10は、一例としてエンコーダ等に使用することができる。
そして、樹脂が充填されるモールド上金型40Aのキャビティ部42においては、図2(C)に示すように、光学素子14の底面30を形成するための凸部42Aの左右方向の長さL3が、底面30の左右方向の長さL0と同等となっている(なお、薄い合成樹脂シート44の厚みは無視した)。なお、凸部42Aの頂面(図2(C)における下面)が、本発明の接触部に相当している。
本発明の第2実施形態に係る光学デバイス10を図7、及び図8にしたがって説明する。なお、第1実施形態と同一構成には同一符号を付し、その説明は省略する。
本発明の第3実施形態に係る光学デバイス10を図9、及び図10にしたがって説明する。なお、第1実施形態と同一構成には同一符号を付し、その説明は省略する。
以上、本発明の一実施形態について説明したが、本発明は、上記に限定されるものでなく、上記以外にも、その主旨を逸脱しない範囲内において種々変形して実施可能であることは勿論である。
12 配線基板
14 光学素子
16 発光素子
18 樹脂部
22 受光部
22A フォトダイオード(画素)
28 開口部
28AE 開口縁
30 底面
32 貫通部
34 ボンディングワイヤ(配線)
40 モールド金型
40A モールド上金型
40B モールド下金型
42 キャビティ
42A 凸部(頂部が接触部)
Claims (2)
- 上面に受光部を有する上面視で矩形状の光学素子と、
前記光学素子を搭載する配線基板と、
矩形状の前記光学素子の1から3つの辺において、前記光学素子と前記配線基板とを電気的に接続する配線と、
前記光学素子の周囲に形成され、かつ前記配線を含む前記光学素子の上面の一部を覆う樹脂部と、
前記樹脂部に設けられ、少なくとも前記受光部及び前記受光部の周辺の前記上面が露出するように形成された凹状の開口部と、
を備え、
前記開口部において底面の一部を構成する前記樹脂部は、前記上面と面一とされており、
前記開口部の一部には、前記樹脂部を貫通し、前記配線基板の一部の表面を露出させる貫通部が設けられ、
前記貫通部から露出された前記配線基板には、発光素子が搭載されている、
光学デバイス。 - 受光部を有する光学素子と、発光素子とを搭載し、前記光学素子、及び前記発光素子とは配線を介して電気的に接続された配線基板を備えた光学デバイスの製造方法であって、
少なくとも前記光学素子と接続される前記配線、及び前記光学素子の一部を、モールド金型を用いて樹脂封止する樹脂封止工程を有し、
前記モールド金型は、封止用の樹脂が充填される凹状のキャビティ部を有し、
前記キャビティ部は、前記受光部、及び前記受光部の周囲の前記光学素子の表面が前記樹脂で覆われないように、前記受光部、及び前記受光部の周囲の前記光学素子の表面に接触すると共に、前記表面と面一となる前記樹脂で形成された光学素子周囲部を形成する平面状の第一接触部と、前記配線基板の一部表面が前記樹脂で覆われないように前記一部表面に接触する第二接触部とを有しており、
前記樹脂封止後に、前記配線基板の前記一部表面に前記発光素子を搭載する、
光学デバイスの製造方法。
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