Turn signal for vehicle
A turn signal for a vehicle has a blue LED as a light source, and an outer cover irradiated by the blue light. The outer cover includes a molded body of a polymeric material including phosphors dispersed therein that absorb blue light and emit light. By means of the present invention, it is possible to provide a turn signal for vehicles which has improved visibility and which imparts excellent visibility and sufficient luminous intensity over a wide angle. Further, because the entire outer cover surface-emits light, uniformity of luminous intensity is ensured without subjecting the outer cover to light scattering treatment, enabling as a result preventing glare caused by light scattering treatment, making this turn signal safe without being unpleasant for pedestrians and drivers of nearby vehicles. Furthermore, because no complex optical design is necessary, this turn signal saves space and can be arranged in a vehicle.
1. A vehicle-mount turn signal projecting orange light and comprising:
a blue LED array capable of emitting blue light as a light source and
an outermost cover adapted to receive blue light, said outermost cover comprising a molded body of a polymer material having dispersed therein an orange emissive phosphor of garnet structure capable of absorbing blue light and emitting orange light, wherein
the orange emissive phosphor is in particulate form having a particle size of 1 to 20 μm, as expressed by a diameter D 50 at 50% by volume cumulative in the particle size distribution,
the orange emissive phosphor of garnet structure is selected from the group consisting of (Y,Gd) 3 Al 5 O 12 :Ce phosphor and Y 3 Al 5 O 12 :Ce phosphor, and
the phosphor is dispersed in the outermost cover in an amount of 1 to 20% by weight, based on the polymer material.
2. The vehicle-mount turn signal of claim 1 , further comprising a base housing on which the blue LED array is mounted.
3. The vehicle-mount turn signal of claim 1 wherein the polymer material is at least one resin selected from thermoplastic resins and thermosetting resins.
4. The vehicle-mount turn signal of claim 3 wherein the thermoplastic resin is at least one resin selected from the group consisting of a polyethylene, polypropylene, polystyrene, polycarbonate, ABS resin and acrylic resin.
5. The vehicle-mount turn signal of claim 3 wherein the thermosetting resin is at least one resin selected from the group consisting of a silicone resin, epoxy resin, phenolic resin, urethane resin and unsaturated polyester resin.
6. The vehicle-mount turn signal of claim 1 wherein said blue LED array comprises a chip serving as an emissive part encapsulated with an encapsulant having a light scattering agent dispersed therein.
7. The vehicle-mount turn signal of claim 1 , further comprising a light scattering member disposed forward of the blue LED array in the emission direction, the light scattering member having a light scattering agent dispersed therein.
8. The vehicle-mount turn signal of claim 1 , further comprising a lens disposed forward of the blue LED array in the emission direction for imparting a luminous intensity distribution angle to the blue light from the blue LED array.
9. The vehicle-mount turn signal of claim 1 , wherein the outermost cover has a textured surface of rugged configuration.
10. The vehicle-mount turn signal of claim 1 which is integrated with an outer surface portion of the vehicle so that light is illuminated outside the vehicle.