| 摘要 |
PROBLEM TO BE SOLVED: To enhance the pseudo-lighting preventing effect. SOLUTION: A group of condenser lens elements 9 is installed ahead of a reflection surface 4, and near each focus F1 of the lens group 9, a group of dichroic thin-film elements transmitting only the light of the specific wavelength region is furnished. When the lamp is lighted, the light L1 from a bulb 5 as a light source is condensed into parallel beams and only the light L4 in the specific wavelength region passes each dichroic thin-film element group 11 to be irradiated to the outside. At the time out of lighting, the external light makes surface reflection as a light in the complementary relation with the light L4 in the specific wavelength region at the surface of the dichroic thin-film element group 11, which should enhance the pseudo-lighting preventing effect at the time out of lighting. The contrast of a color light (L4) to the mixture of the color light and white light can be enlarged by providing a non- phototransmissive film other than the dichroic element group 11. |
