Multicolor display lamp

Claim 1

A multicolor display lamp comprising: a plurality of light sources having different emitting colors arranged in four areas obtained by dividing a rectangle into upper and lower, left and right portions; said light sources being arranged such that their optical axes are parallel to each other; and an optical system arranged frontwardly of said light sources for individually spreading emitting rays of said light sources in both longitudinal and lateral directions to form parallel rays which extend over a whole of a display surface which has a size corresponding to an opening of said rectangle, said optical system comprising: at least two first plate-like lenses, arranged so as to be inclined relative to each other to form a generally V-shaped configuration frontward of said light sources, for bending individual rays which enter one of said first plate-like lenses non-perpendicular to the incline of said one first plate-like lens to exit perpendicular to the incline of said one first plate-like lens, and for allowing individual rays which enter one of said first plate-like lenses perpendicular to the incline of said first plate-like lens to exit perpendicular to the incline of said first plate-like lens; a second plate-like lens, arranged perpendicular to the optical axes of said light source and frontward of said at least two first plate-like lenses, for bending individual rays which enter said second plate-like lens non-perpendicular to said second plate-like lens to exit perpendicular to said second plate-like lens and for allowing individual rays which enter said second plate-like lens perpendicular to said second plate-like lens to exit perpendicular to said second plate-like lens; at least two third plate-like lenses, arranged so as to be inclined relative to each other to form a generally V-shaped configuration frontward of said second plate like lens and having a trough perpendicular to a trough of said generally V-shaped configuration of said at least two first plate-like lenses, for bending individual rays which enter one of said third plate-like lenses non-perpendicular to the incline of said one third plate-like lens to exit perpendicular to the incline of said one third plate-like lens, and for allowing individual rays which enter one of said third plate-like lenses perpendicular to the incline of said one third plate-like lens to exit perpendicular to the incline of said one third plate-like lens; and a fourth plate-like lens, arranged perpendicular to the optical axes of said light sources and frontward of said third plate-like lenses, for bending individual rays which enter said fourth plate-like lens non-perpendicular to said fourth plate-like lens to exit perpendicular to said fourth plate-like lens and for allowing individual rays which enter said fourth plate-like lens perpendicular to said fourth plate-like lens to exit perpendicular to said fourth plate-like lens.