| 摘要 |
PROBLEM TO BE SOLVED: To realize a projection screen having a sneak shot preventive function utilizing a conventional projection screen installed in a theater, and the like. SOLUTION: An infrared ray of a wavelength longer than that of the longer wavelength end of a visible light is utilized as an interference light for preventing a sneak shot. A light emitting device 15 is mounted directly on a screen body 13. The light emitting device includes a substrate (20) and a plurality of light emitting elements (21a-21y) disposed on the substrate. A light scattering plate (22) is disposed facing the light emitting face of the light emitting elements. The light scattering plate includes a transparent plate (24) and a scattering transmission film (25). An interference light of an infrared range is emitted from the light emitting elements so that the interference light is incident on an audience space via the scattering transmission film. As a result, since the interference light is incident on a video camera in the audience space together with the image light, deteriorated picture contents not to be viewed are taken by the video camera. Thereby, secondary distribution of the image contents taken by a sneak shot is prevented. COPYRIGHT: (C)2010,JPO&INPIT
|
