投影型シースルーピラーのためのスクリーンの検討

摘要

乗用車を運転する際，何より視覚による十分な安全確認が必要とされる.しかし，Aピラー（フロントガラス両端の支柱）の作る死角が，運転手の視界を大きく狭める.車両の強度を保つ点から考えて，視界確保のために，安易にピラーを細くすることは難しい.それどころか，近年では，車体の安全性や，デザイン性により，ピラーは太く作られることが多くなっている.%It is essential for car drivers to obtain sufficient visual information, but the dead angle caused by the pillar is often a problem to ensure the safety. In order to solve this problem, optical camouflage technologies using a retro-reflective projection technology is a promising approach. However, it is difficult for the driver to wear a head-mounted projector. Therefore we have proposed the method to separate a projector from the driver's head. In our method, a screen attached to the front pillars should have characteristics to reduce the influence of the variance of environment light while maintaining high contrast in the vertical direction. In this study, the authors measured the luminance of the projected image on a white screen, beads type retroreflector, prism type retroreflector, and beads type retroreflector covered with a difluser. The results show that beads type retroreflector covered with a diffuser is effective for this method.