| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light-emitting device. <P>SOLUTION: The light-emitting device comprises: LED light sources; and light diffusion elements. The light diffusion element covering at least some LED light sources is composed of a first polymer, a second polymer, or a mixture thereof. The first polymer has a crystal particle diameter larger than that of the second polymer. The first polymer contains polypropylene, or ethylene propylene copolymer. The second polymer contains polyethylene, polypropylene, or ethylene propylene copolymer. A mixture of the first and second polymers at a predetermined ratio causes an excellent material to generate improved light diffusion. This material is used widely in the current luminaire to distribute the light sources uniformly and to increase the luminance. <P>COPYRIGHT: (C)2012,JPO&INPIT |
