| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that leaked light is colored and mistaken for the lighting of a display lamp when it is seen from a vehicle, but it is impossible to prevent the leakage of visible light in an infrared transmission filter for an infrared projector. SOLUTION: The infrared transmission filter 1 selecting infrared out of luminescent color from an incandescent lamp is constituted by successively forming a 1st laminated film group 2 having absorption characteristic in a visible light region and adjusting the quantity of the leaked light, a 2nd laminated film group 3 controlling chromaticity on the leaked light by performing the wavelength control of the leaked light in the visible light region, and a 3rd laminated film group 4 performing the wavelength control that infrared light is transmitted from a light source side, and is set so that the leaked light transmitted through the 1st and the 2nd laminated film groups is white light within a specified chromaticity range. COPYRIGHT: (C)2005,JPO&NCIPI
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