| 摘要 |
PROBLEM TO BE SOLVED: To provide an illumination device which gives illumination distribution of high energy density or which gives changes to the illumination distribution shape in the illumination device in which plural luminous material elements are used. SOLUTION: Optical elements (for examples, lenses) to make a pair with numerous luminous material elements (for example, light emitting diode) are arranged, to enhance the energy density. By controlling light divergence angle of unit luminous material and emission directions, the energy density are locally enhanced. |
