JP5190480B2 - 光導体光学装置 - Google Patents
光導体光学装置 Download PDFInfo
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Description
ここでβ′refは反射されないが、βrefは反射されるような反射面が検出され、これが適用されると、所望の要件が満たされうる。図3A及び図3Bは選択的反射面における所望の反射を示す。この図において軸外角度βref〜25°を有する光線32(図3A)は部分的に反射され、基板34外に結合される。一方軸外角度β′ref〜75°で反射面に到達する(これはβ′ref〜105°に等しい)光線36(図3B)は、顕著な反射はなく反射面34を介して伝送される。
S1=T・tan(α) (9)
と表され、ここでTは基板の厚さを表す。
1)入力表示源は基板と接近した位置に配置されうるため、光学システムの全体構成が非常にコンパクトで軽量に設計されることが可能で、圧倒的に有利なフォームファクタを実現可能である。
2)他のコンパクト・ディスプレイ構成とは異なり、本発明はアイピースに対する入力表示源の配置を自由にする。この自由度及び表示源を拡大基板の近辺に配置できるという特徴により、他のディスプレイ・システムで適用されている軸外光学構成を適用する必要性が低減される。さらにLOEの入力アパーチャは出力アパーチャの活性領域よりも遥かに小さいため、コリメータレンズ6の開口数は一般の画像形成システムのものに比べて小さく設計できる。その結果より好都合な光学システムを実現することが可能になり、軸外光学及び高開口数のレンズに起因する視野や色収差などの各種問題を比較的簡単且つ効率的に補償可能である。
3)本発明における選択的反射面の反射係数は対応するスペクトル全体において気宇本的に均一である。したがって表示源として単色及び多色光源のいずれを適用することも可能である。またLOEの波長依存性は無視できる程度のものであるため、高画質且つ高解像殿のカラー表示を実現することが可能である。
4)入力表示からの各点は平面波に変換され、反射アレイにおける比較的大きな部分から反射されてビューアの目に映されるため、目における正確な位置に対する公差が著しく緩和されうる。よってビューアは視野(FOV)全体を見ることができ、EMB(eye−motion−box)は他の一般のコンパクト・ディスプレイに比べて大きく設定することが可能である。
5)表示源からの光エネルギーの大部分が基板内に結合され、この結合された光エネルギーの大部分が再生利用されてビューアの目に結合されるため、電力消費量の低い表示源であっても、比較的高い輝度の表示を実現することが可能である。
情報技術の発展に伴い3Dディスプレイの需要が高まっている。現に多くの3D表示関連機器が既に市場に出回っている。しかし現在の市場で入手可能なシステムでは、ユーザは左目及び右目のそれぞれのために画像を分離するための特殊装置を着用する必要がある。このよう視覚補助システムは多くの専門分野においては確立している技術である。しかしこのような技術を更に幅広い分野に普及させるためには視覚上快適さが向上され、二眼性視覚により近似するように適応された自由視覚システムを実現する必要がある。この問題に対する現在の取り組みの多くはまだ様々な欠点を有し、特に画質や視覚上快適さなどの観点においては一般の2D表示に比べて著しく劣っている。
[付記]
付記(1):
2以上の相互平行の主要面及びエッジを有する光透過性基板、
全反射により前記基板内に光線を結合するための光学手段、及び
前記基板内に配置される1以上の部分的反射面から構成される光学装置であって、
前記基板内に結合される光線で前記基板内において同一の軸外角度を有する光線は前記部分的反射面に対して2つの異なる入射角度で交差することを特徴とする光学装置。
付記(2):
前記結合された光線は2以上の異なる入射角度で前記部分的反射面に対して2度以上交差することを特徴とする、付記(1)に記載の光学装置。
付記(3):
前記2つの異なる入射角度のうちの一方は他方の角度よりもかなり小さいことを特徴とする、付記(1)に記載の光学装置。
付記(4):
前記部分的反射面は角度スペクトルの一部については小さな反射率を有し、角度スペクトルの別の部分についてはより大きな反射率を有することを特徴とする、付記(1)に記載の光学装置。
付記(5):
前記部分的反射面は高い入射角度では低い反射率を有し、低い入射角度では高い反射率を有することを特徴とする、付記(4)に記載の光学装置。
付記(6):
前記部分的反射面は前記2以上の入射角度のうちの第1入射角度については小さな反射率を有し、第2入射角度についてはより大きな反射率を有することを特徴とする、付記(1)に記載の光学装置。
付記(7):
前記小さな反射率を有する第1入射角度は前記第2入射角度よりもかなり大きいことを特徴とする、付記(6)に記載の光学装置。
付記(8):
相互に平行であって、前記基板の主要面のエッジのいずれにも平行でないように配置される2以上の部分的反射面からなるアレイを有することを特徴とする、付記(1)に記載の光学装置。
付記(9):
前記光学手段は前記基板内に配置される光波反射面に相当することを特徴とする、付記(1)に記載の光学装置。
付記(10):
前記1以上の部分的反射面は前記全反射によって閉じ込められる光を前記基板外へ結合することを特徴とする、付記(1)に記載の光学装置。
付記(11):
前記結合された光の少なくとも一部が前記基板外に結合される前に前記部分的反射面に対して2度以上2つの異なる入射角度で交差するように前記基板内に光を結合するための光学手段は前記主要面に対して角度付けて配置されることを特徴とする、付記(10)に記載の光学装置。
付記(12):
入力光波から出力光波を生成する手段を更に有し、
前記入力光波及び前記出力光波は前記基板の同一側部に位置することを特徴とする、付記(1)に記載の光学装置。
付記(13):
入力光波から出力光波を生成する手段を更に有し、
前記入力光波は前記基板の一側部に位置され、前記出力光波は前記基板の他方の側部に位置することを特徴とする、付記(1)に記載の光学装置。
付記(14):
入力光波から出力光波を生成する手段を更に有し、
前記入力光波は前記エッジのうちの1つを介して前記基板内に結合されることを特徴とする、付記(1)に記載の光学装置。
付記(15):
前記1以上の部分的反射面の反射率によって均一な輝度プロフィールを有する視野(FOV)が実現されることを特徴とする、付記(1)に記載の光学装置。
付記(16):
前記1以上の部分的反射面の反射率によって所定の輝度プロフィールを有する視野が実現されることを特徴とする、付記(1)に記載の光学装置。
付記(17):
前記反射面において各部分的反射面の反射率を不均一にすることにより所定の輝度プロフィールを有する視野が実現されることを特徴とする、付記(8)に記載の光学装置。
付記(18):
前記部分的反射面間の距離によって所定の輝度プロフィールを有する視野が実現されることを特徴とする、付記(8)に記載の光学装置。
付記(19):
前記部分的反射面のP分極光に対する反射率が測定されることを特徴とする、付記(1)に記載の光学装置。
付記(20):
前記部分的反射面のS分極光に対する反射率が測定されることを特徴とする、付記(1)に記載の光学装置。
付記(21):
前記部分的反射面の非分極光に対する反射率が測定されることを特徴とする、付記(1)に記載の光学装置。
付記(22):
前記基板に配置される1又は複数の反射面または部分的反射面からなる第2の反射面又は部分的反射面のセットを更に有し、前記第2セットにおける部分的反射面は相互に平行であって、前記1以上の部分的反射面とは平行でないように配置されることを特徴とする、付記(1)に記載の光学装置。
付記(23):
前記第2の反射面又は部分的反射面のセットは全反射によって前記基板内に結合される光の伝搬方向を変更することを特徴とする、付記(22)に記載の光学装置。
付記(24):
前記第2セットの部分的反射面の反射率によって均一な輝度プロフィールを有する視野が実現されることを特徴とする、付記(22)に記載の光学装置。
付記(25):
前記第2セットの部分的反射面の反射率によって所定の輝度プロフィールを有する視野が実現されることを特徴とする、付記(22)に記載の光学装置。
付記(26):
前記基板によって保持される1対以上の反射面を更に有し、前記反射面の対における反射面は相互に平行であって、前記基板のエッジの一部を構成することを特徴とする、付記(1)に記載の光学装置。
付記(27):
前記1以上の反射面の対は全反射によって前記基板内に結合された光の伝搬方向を変更してから前記変更された伝搬方向をもとの方向に戻すことを特徴とする、付記(26)に記載の光学装置。
付記(28):
前記1以上の反射面の対の位置及び方向性によって所定の入力アパーチャに対応する所定の視野が実現されることを特徴とする、付記(26)に記載の光学装置。
付記(29):
前記1以上の反射面の対の位置及び方向性によって所定の視野に対応する所定の入力アパーチャが実現されることを特徴とする、付記(26)に記載の光学装置。
付記(30):
2以上の基板が合体されて光学システムを構成することを特徴とする、付記(1)に記載の光学装置。
付記(31):
前記2以上の基板の位置及び方向性によって所定の視野に対応する所定の入力アパーチャが実現されることを特徴とする、付記(30)に記載の光学装置。
付記(32):
前記2以上の基板内に配置される部分的反射面の反射率によって所定の輝度プロフィールを有する視野が実現されることを特徴とする、付記(30)に記載の光学装置。
付記(33):
表示光源を更に有することを特徴とする、付記(1)に記載の光学装置。
付記(34):
前記表示光源は液晶ディスプレイ(LCD)に相当することを特徴とする、付記(1)に記載の光学装置。
付記(35):
前記光源と前記LCDの液晶との間には角度選択拡散器が配置されることを特徴とする、付記(34)に記載の光学装置。
付記(36):
前記拡散器の角度配置によって所定の輝度プロフィールが実現されることを特徴とする、付記(34)に記載の光学装置。
付記(37):
前記表示光源は発散角度を有する有機発光ダイオードディスプレイ(OLED)に相当することを特徴とする、付記(33)に記載の光学装置。
付記(38):
前記ダイオードの発散角度は所定の輝度プロフィールを有する視野を実現するように設定されることを特徴とする、付記(37)に記載の光学装置。
付記(39):
前記表示光源に対して横方向に整列されるマイクロレンズのアレイを更に有する、付記(24)に記載の光学装置。
付記(40):
前記マイクロレンズの焦点距離及び位置を測定することによって所定の輝度プロフィールが実現されることを特徴とする、付記(28)に記載の光学装置。
付記(41):
前記基板は透明動作を実現するために部分的に透明であることを特徴とする、付記(1)に記載の光学装置。
付記(42):
外部シーンから前記基板への入射を遮断するために前記基板の上部又は内部に配置される不透明面を更に有することを特徴とする、付記(1)に記載の光学装置。
付記(43):
外部シーンから前記装置を通過する光の輝度を制御するために前記基板を透過する光を減衰するように配置される可変等仮面を更に有することを特徴とする、付記(1)に記載の光学装置。
付記(44):
前記可変透過面の透過性は前記基板を透過する光の輝度に応じて自動的に確定されることを特徴とする、付記(43)に記載の光学装置。
付記(45):
前記1以上の部分的反射面は閉じ込められた光波が観察者の片方の目に到達するように該光波を反射することを特徴とする、付記(1)に記載の光学装置。
付記(46):
前記1以上の部分的反射面は閉じ込められた光波が観察者の片方の目に到達するように該光波を反射することを特徴とする、付記(1)に記載の光学装置。
付記(47):
複数の表示光源を更に有することを特徴とする、付記(46)に記載の光学装置。
付記(48):
前記複数の表示光源からの画像は3次元画像を生成することを特徴とする、付記(47)に記載の光学装置。
付記(49):
前記装置は外部シーンからの光を基板内に結合することを特徴とする、付記(1)に記載の光学装置。
付記(50):
スターライト増幅器を更に有することを特徴とする、付記(1)に記載の光学装置。
付記(51):
前記装置は観察者の頭側に配置され、対物レンズが後方に配置され、アイピースが前方に配置されように構成されることを特徴とする、付記(49)に記載の光学装置。
付記(52):
前記装置はメガネフレームに搭載されることを特徴とする、付記(1)に記載の光学装置。
付記(53):
前記装置は移動通信機器搭載されることを特徴とする、付記(1)に記載の光学装置。
付記(54):
前記1以上の部分的反射面は閉じ込められた光波が被照体を照明するように計算された方向に該光波を反射することを特徴とする、付記(1)に記載の光学装置。
付記(55):
前記被照体は液晶ディスプレイに相当することを特徴とする、付記(54)に記載の光学装置。
Claims (10)
- 与えられた偏光状態を有すると共に与えられた光学的なスペクトル内に及び第一の角度の範囲内に位置させられた第一の組みの光の波を部分的に反射させると共に、同じ与えられた偏光状態を有すると共に同じ与えられた光学的なスペクトル内に及び第二の角度の範囲内に位置させられた第二の組みの光の波を透過させるための光学的なデバイスであって、
表面を有する第一の光を透過させる基体、及び、
上記の表面に配されたコーティング
:を具備する、光学的なデバイスにおいて、
上記の第一の角度の範囲内に位置させられた角度は、上記の第二の角度の範囲内に位置させられた角度と比べてより小さいものであること、及び、
上記の第一の組みの光の波のコートされた表面による固有反射率は、上記の第二の組みの光の波のコートされた表面による固有反射率と比べてより高いものであること
を特徴とする、光学的なデバイス。 - 請求項1に従った光学的なデバイスであって、
さらに、上記のコートされた表面で前記第一の光を透過させる基体へ接合された透明な平坦なプレートを具備する、光学的なデバイス。 - 請求項1に従った光学的なデバイスにおいて、
上記の偏光状態は、P−偏光である、光学的なデバイス。 - 請求項1に従った光学的なデバイスにおいて、
上記の偏光状態は、S及びP偏光の組み合わせである、光学的なデバイス。 - 請求項4に従った光学的なデバイスにおいて、
上記の第一の組みの光の波の反射率は、上記の表面での入射の角度を増加させると共に単調に減少する、光学的なデバイス。 - 請求項1に従った光学的なデバイスにおいて、
上記の第一の組みの光の波の反射率は、上記の表面での入射の角度を増加させると共に単調に変化する、光学的なデバイス。 - 請求項6に従った光学的なデバイスにおいて、
上記の第一の組みの光の波の反射率は、上記の表面での入射の角度を増加させると共に単調に増加する、光学的なデバイス。 - 請求項1に従った光学的なデバイスにおいて、
上記の光学的なスペクトルは、可視のスペクトル内に位置させられたものである、光学的なデバイス。 - 請求項1に従った光学的なデバイスにおいて、
上記の第一の角度の範囲は、15°及び40°の間における領域内に位置させられたものである、光学的なデバイス。 - 請求項1に従った光学的なデバイスにおいて、
上記の第二の角度の範囲は、50°及び80°の間における領域内に位置させられたものである、光学的なデバイス。
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