| 摘要 |
PROBLEM TO BE SOLVED: To freely control color of an emitted light by arranging an LED substrate having red, blue and green LED chips, a diffusion filter and a convex lens in a line and by applying surface-coarsing processing on the surface of the convex lens. SOLUTION: An LED substrate 4 which is provided with three kinds of red, blue and green LED chips 4a-4c, a diffusion filter 3 and a convex lens 2 are arranged in a line maintaining a predetermined distance each other, and a surface of the convex lens 2 is made surface-coarsing processing. For example the convex lens 2, the diffusion filter 3 and the LED substrate 4 is contained in a glass vessel 1 having a test tube shape of which closed terminal surface is formed as the convex lens 2 so as to locate keeping a predetermined distance by the presence of cylinder shape spacers 9 and 10 therebetween. The diffusion filter 3 is made of a transparent a crylic resin with a cylindrical shape, of which the both surfaces are made to be coarse surface processed. Inert gas is preferably sealed in the glass vessel 1, which contains the LED substrate 4 and the diffusion filter 3 to protect the LED chips 4a-4c. |
