双曲面ハーフミラーを用いた広視野頭部搭載プロジェクタのための再帰性半透過スクリーンの検討  [in Japanese] Design Considerations for a Semi-transparent Retro-reflective Screen for a Wide-view Head Mounted Projective Display using a Hyperboloidal Half-mirror  [in Japanese]

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Author(s)

Abstract

近年,一般の頭部搭載プロジェクタ(HMPD, Head Mounted Projective Display)の平板ハーフミラーを双曲面ハーフミラーに置き換えることで広視野化を実現したHyperboloidal HMPD (HHMPD)が提案されている.一般のHMPDやHHMPDは,映像提示のために再帰反射スクリーンが必要なため,屋外などのウェアラブル環境では利用できないという欠点がある.ウェアラブル環境で利用するために再帰性と透過性を両立するスクリーンが従来提案されているが,既存手法では精密な加工を要するため製造が困難であるなどの問題があった.本研究では再帰性半透過スクリーンの簡易な実現方法をいくつか検討し,実際にスクリーンを試作した.小型プロジェクタを用いた映像投影試験の結果,再帰性と透過性を両立できること,また,換算視力は0.07程度と低いものの視距離によらず実物体に重畳して投影像を観察できることを確認した.

Recently, a Hyperboloidal Head Mounted Projective Display (HHMPD) has been proposed by using a hyperboloidal mirror instead of a planar mirror in a Head Mounted Projective Display (HMPD). This HHMPD can provide a wide field-of-view (FOV), a large observational pupil, and optical see-through capability. A typical HMPD or HHMPD requires a retro-reflective screen to display images so it can not be used in outdoor or in a wearable environment. In order to make a HMPD available anywhere, a number of screens have been proposed that achieve both retro-refiection and optical transparancy. However existing approaches have problems such as being difficult to manufacture due to precision machining. In this article, explored are a number of simple implementations of a retro-refiective semi-transparent screen. Experimental results show that our prototype slide screen achieves both retro-refiection and optical transparency, and that the projected image from a small projector is clearly overlaid onto a real object with visual acuity of 0.07 or 14 minarc regardless of the distance of sight.

Journal

  • IEICE technical report

    IEICE technical report 110(382), 353-358, 2011-01-13

    The Institute of Electronics, Information and Communication Engineers

References:  12

Codes

  • NII Article ID (NAID)
    110008675716
  • NII NACSIS-CAT ID (NCID)
    AN10476092
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09135685
  • NDL Article ID
    10970161
  • NDL Source Classification
    ZN33(科学技術--電気工学・電気機械工業--電子工学・電気通信)
  • NDL Call No.
    Z16-940
  • Data Source
    CJP  NDL  NII-ELS 
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