JP6507098B2 - 焦点距離調節を含む光学モジュール、および光学モジュールの作製 - Google Patents
焦点距離調節を含む光学モジュール、および光学モジュールの作製 Download PDFInfo
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Description
この開示は、カメラおよび他の装置用の光学モジュールに関する。それはまた、ウェーハスケールの製造ステップを使用してそのようなモジュールを製造する方法に関する。
装置、特に光学装置の製造時、たとえば、プロセスステップのうちの1つ以上における多かれ少なかれ避けられない変動または不正確性のために、製造むらまたは製造ずれが起こり得る。たとえば、光学装置が1つ以上のレンズ素子を含む場合、(光学部品ウェーハと呼ばれる)ウェーハ上の多くのそのようなレンズ素子は典型的には、同じ公称焦点距離を有するにもかかわらず、若干変動する焦点距離を有するであろう。場合によっては、焦点距離はフランジ焦点距離(flange focal length:FFL)に対応するかもしれず、それは、装置の最終物理面(すなわち、センサーに最も近い装置の物理面)と装置のレンズ系の焦点面との間の距離を指す。より一般的には、焦点距離は、あらゆる焦点距離パラメータ(たとえば、有効焦点距離(effective focal length:EFL))を指していてもよい。いずれにせよ、焦点距離の変動は、レンズ系の焦点面が画像センサー平面から離れて位置することをもたらすおそれがあり、それは、画質の劣化につながるおそれがある。
この開示は、光学装置、および光学装置を作製する方法を説明する。レンズ系の焦点距離の変動を補正するように、レンズ系に焦点距離調節を提供するために、さまざまなアプローチが説明される。
図1によって示すように、複数の光学モジュールを作製する方法は、ウェーハレベルでさまざまなステップを行なうことを含んでいてもよく、各装置において光学素子の焦点距離変動を補正し、または他のやり方で調節するための特徴を取り入れている。この文脈では、ウェーハは、たとえば、ポリマー材料(たとえば、熱またはUV硬化性ポリマーといった硬化可能材料)、ガラス材料、半導体材料、もしくは、金属およびポリマーを含む、またはポリマーおよびガラス材料を含む複合材料で構成されてもよい。一般に、ウェーハとは、実質的に円盤またはプレート状に形づくられたアイテムを指し、1方向(z方向、すなわち垂直方向)におけるその寸法は、他の2方向(x方向およびy方向、すなわち横方向)におけるその延長に対して小さくなっている。複数の同様の構造またはアイテムが、(非ブランク)ウェーハの上または中に、たとえば矩形の格子上に配置され、または設けられてもよい。ウェーハは開口部(すなわち孔)を有していてもよく、ウェーハはさらに、その横方向区域の主要部分に材料がなくてもよい。
Claims (12)
- 光学装置を作製する方法であって、前記方法は、
複数の光学系を予め定められた波長または波長範囲の光を通し、互いに異なる素材の複数の層で構成される基板の上に搭載するステップと、
光学系にそれぞれの焦点距離補正を提供するために、光学系のうちの少なくともいくつかの下で基板の厚さを調節するステップとを含み、厚さを調節するステップは基板の一部を除去して前記基板が第1の光学チャネルのための前記基板の第1エリアから第2の光学チャネルのための前記基板の第2のエリアまで層厚を変化させることを含み、方法はさらに、
次に、基板を複数の光学モジュールへと分離するステップとを含み、複数の光学モジュールは各々、基板の上に搭載された光学系のうちの1つ以上を含む、方法。 - 基板の厚さを調節するステップは、
光学系の焦点距離の変動を補正するように、光学系のうちの少なくともいくつかの下に材料を除去するために、マイクロマシニングを使用するステップを含む、請求項1に記載の方法。 - 基板の厚さを調節するステップは、光学系から最も遠い基板の層にそれぞれの穴を形成するステップを含む、請求項1に記載の方法。
- 光学系を基板上に搭載するステップの前に、ウェーハレベルプロセスで光学系を作製するステップと、複数の光学系を形成するためにウェーハスタックを分離するステップとを含む、請求項1に記載の方法。
- 基板の表面は1つ以上の光学フィルター層を含み、前記方法は、1つ以上の光学フィルター層が位置する場所に光学系を搭載するステップを含む、請求項1に記載の方法。
- 基板上に、クロスチャネル迷光減少素子を、光学系の隣り合うもの同士の間に設けるステップと、
基板を複数の光学モジュールへとダイシングするステップとを含み、複数の光学モジュールは各々、クロスチャネル迷光減少素子によって分離された、光学系のうちの2つを含む、請求項1に記載の方法。 - クロスチャネル迷光減少素子はコーティング層の上のスペーサを含み、スペーサとコーティング層とは予め定められた波長または波長範囲の光に対して不透明である、請求項7に記載の方法。
- 基板の表面は、1つ以上の光学フィルター層を含み、前記方法は、1つ以上の光学フィルター層上に光学系を搭載するステップを含む、請求項1に記載の方法。
- 1つ以上の光学フィルター層は、カラーフィルター層および/または赤外線フィルター層を含む、請求項8に記載の方法。
- 基板の1つ以上の底面にコーティングを設けるステップを含み、コーティングは予め定められた波長または波長範囲の光に対して不透明である、請求項1に記載の方法。
- 選択された部分は、フォトリソグラフィー手法によって除去される、請求項1に記載の方法。
- 各光学系についてそれぞれの焦点距離を測定するステップと、
光学系について測定された焦点距離に基づいて、異なる位置で、基板のそれぞれの量を除去するステップとをさらに含む、請求項1に記載の方法。
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US201261721747P | 2012-11-02 | 2012-11-02 | |
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US201361772073P | 2013-03-04 | 2013-03-04 | |
US61/772,073 | 2013-03-04 | ||
PCT/SG2013/000470 WO2014070115A1 (en) | 2012-11-02 | 2013-10-31 | Optical modules including focal length adjustment and fabrication of the optical modules |
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JP2015535097A JP2015535097A (ja) | 2015-12-07 |
JP2015535097A5 JP2015535097A5 (ja) | 2016-12-01 |
JP6507098B2 true JP6507098B2 (ja) | 2019-04-24 |
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US (3) | US9595553B2 (ja) |
EP (1) | EP2914997B1 (ja) |
JP (1) | JP6507098B2 (ja) |
KR (1) | KR102161763B1 (ja) |
CN (1) | CN104781721B (ja) |
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US10298834B2 (en) | 2006-12-01 | 2019-05-21 | Google Llc | Video refocusing |
US9716081B2 (en) | 2012-05-17 | 2017-07-25 | Heptagon Micro Optics Pte. Ltd. | Assembly of wafer stacks |
US9858649B2 (en) | 2015-09-30 | 2018-01-02 | Lytro, Inc. | Depth-based image blurring |
US10334151B2 (en) | 2013-04-22 | 2019-06-25 | Google Llc | Phase detection autofocus using subaperture images |
US9543354B2 (en) | 2013-07-30 | 2017-01-10 | Heptagon Micro Optics Pte. Ltd. | Optoelectronic modules that have shielding to reduce light leakage or stray light, and fabrication methods for such modules |
SG11201606706WA (en) | 2014-02-18 | 2016-09-29 | Heptagon Micro Optics Pte Ltd | Optical modules including customizable spacers for focal length adjustment and/or reduction of tilt, and fabrication of the optical modules |
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