| 摘要 |
PROBLEM TO BE SOLVED: To provide an airborne video projector which reduces the interference fringes of projected video and the generation of a chromatic aberration, increases the view angle of the projected video and can obtain perfect erected video where a ghost image is erased, in an optical system using an inexpensive Fresnel lens or concave mirror. SOLUTION: A casing is divided into an upper chamber R1 and a lower chamber R2 and projected objects 8 and 18 such as a display image or a real thing are arranged in the lower chamber R2. A first Fresnel lens 10 is provided on the boundary between the upper chamber R1 and the lower chamber R2 and a beam splitter 11 is provided to incline at an angle of 45°in the central part of the upper chamber R1. A surface reflective mirror 13 is provided on the back surface on the side opposite to the front opening 2 of the upper chamber R1 across the beam splitter 11, a second Fresnel lens 12 is provided inside the surface opening 2 and a circular polarizing film 14 and a reflection preventing film 15 are provided outside the surface opening 2 respectively. Thus, the perspective of airborne stereoscopic video is enhanced and simultaneously erected video without the ghost image can be obtained. COPYRIGHT: (C)2007,JPO&INPIT
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