| 摘要 |
PURPOSE:To obtain a device in a low cost with no reduction of picture quality by superposing three sheets of multispectrum photographic images by utilizing beam splitters. CONSTITUTION:Two pieces of beam splitters 13, 14 inclined by 45 deg. against an observation direction are arranged in parallel mutually along the observation direction and light sources 17 emitting illumination light respectively in the direction perpendicular to the observation direction toward the two sheets of the beam splitters 13, 14 are provided. And a light source 17 emitting an illumination light reversal to the observation direction toward this beam splitter 14 is provided further behind the beam splitter 14 located more apart from the observation position to position multispectrum photographic images 19, 20, 21 between the beam splitters 13, 14 respectively and the light source 17 such that all of the light paths from the observation position becomes equal and filters 26, 26, 28 corresponding to each of multispectrum photgraphinc images 19, 20, 21 are provided between the beam splitters 13, 14 and the light sources 17. |
