BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a cubic view according an embodiment of the present invention.
FIG. 2 shows an exploring view of the embodiment shown in FIG. 1.
FIG. 3 shows a cross-sectional view of the embodiment shown in FIG. 1.
FIG. 4 shows a cross-sectional view according another embodiment of the present invention.
FIG. 5 shows a cross-sectional view according another embodiment of the present invention.
FIG. 6 shows a cross-sectional view according another embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1 to FIG. 3 according an embodiment of the present invention, an illumination device 10 is a UV LED that is fixed on a circuit board 11 (as shown in FIG. 1 to FIG. 3) and coupled with the circuit board 11. There are three photoluminescence plates 20, 21 and 22 (as shown in FIG. 3) disposed on the radiation path of the UV LED, and a red photoluminescence plate 20, a green photoluminescence plate 21 and a blue photoluminescence plate 22 are disposed in irradiated order. Accordingly, the light radiating form the illumination device 10 passes through three photoluminescence plates 20, 21 and 22 to appear a white light, and a color rendering above 90% is reached. The better is the color rendering, the closer to the solar light. The whole light is stable enough as the efficiency of UV is better.
Therefore, the present invention provides a method for obtaining a better color rendering with a photoluminescence plate according the embodiment, comprising the steps of:
- (a) disposing a tricolor photoluminescence plate on the radiation path of an UV illumination device; and
- (b) coupling the UV illumination device with a power, such that a light radiating from the UV illumination device passes through the tricolor photoluminescence plate to excite the tricolor photoluminescence plate and radiate a white light.
Referring to FIG. 3 and FIG. 4 according another embodiment of the present invention, the photoluminescence plate 23 is made in a structure of three layers. The photoluminescence plate 23 has three photoluminescence layers 231, 232 and 233 disposed on the radiation path of the UV illumination device 10 in irradiated order, and therefore the first is a red photoluminescence layer 231, the next is a green photoluminescence layer 232 and the last is a blue photoluminescence layer 233. The UV illumination device 10 (as shown in FIG. 3) illuminates on three photoluminescence layers 231, 232 and 233, and excites three photoluminescence layers 231, 232 and 233 individually to radiate a white light.
Referring to FIG. 3 and FIG. 5 according another embodiment of the present invention, the photoluminescence plate 24 is made in a structure of one piece. A photoluminescence layer 241 made of fully mixed fluorescent materials with three colors is disposed on the photoluminescence plate 24, and therefore the UV illumination device 10 illuminates on the photoluminescence layer 241 (as shown in FIG. 5) to excite the fluorescent materials and then radiates a white light with the color mixing performance.
Referring to FIG. 6 according another embodiment of the present invention, an illumination device comprises a blue LED illumination device 30 and red LED illumination devices 40, and there are two photoluminescence plates 31 and 32 disposed on the outside of the blue LED illumination device 30. The photoluminescence plates 31 near to the blue LED illumination device 30 is a cyan photoluminescence plate and the photoluminescence plates 32 far away from the blue LED illumination device 30 is a green photoluminescence plate. The blue LED illumination device 30 excites the cyan photoluminescence plate 31 and the green photoluminescence plate 32 to produce a colorful light, and then the colorful light is mixed with a red light radiated from the red LED illumination devices 40 to appear a white light. The color rendering of the white light can reaches above 90%.
As foregoing description, the present invention provides a method for obtaining a better color rendering with a photoluminescence plate, comprising the steps of:
- (a) disposing two illumination devices, wherein one is a blue illumination device and the other is a red illumination device near to the blue illumination device;
- (b) disposing a bicolor photoluminescence plate on the radiation path of the blue illumination device, wherein the bicolor is cyan and green; and
- (c) coupling the blue illumination device and the red illumination device with a power, such that a blue light radiated from the blue illumination device passes through the bicolor photoluminescence plate to excite the bicolor photoluminescence plate and produce a colorful light, and then the colorful light is mixed with a red light radiated from the red LED illumination devices to appear a white light.
In addition to, the present invention provides another method for obtaining a better color rendering with a photoluminescence plate, comprising the steps of:
- (a) disposing two illumination devices, wherein one is a blue illumination device and the other is a red illumination device near to the blue illumination device;
- (b) disposing a monochrome photoluminescence plate on the radiation path of the blue illumination device, wherein the monochrome is green; and
- (c) coupling the blue illumination device and the red illumination device with a power, such that a blue light radiated from the blue illumination device passes through the monochrome photoluminescence plate to excite the bicolor photoluminescence plate and produce a colorful light, and then the colorful light is mixed with a red light radiated from the red LED illumination devices to appear a white light.
Although the present invention has been explained in relation to its preferred embodiments, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Patent Application
20080093615
