| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inexpensive optical control diffusion element which is excellent in contrast, brightness and durability by equalizing an intensity distribution of an illumination pattern of a diffusion light in a visible wavelength region. <P>SOLUTION: In an optical control system for uniformly diffusing a transmitted light in a defined angle region, the optical control diffusion element includes a surface relief hologram diffraction grating and a surface relief hologram diffusion element for giving a predetermined illumination pattern to a diffused light. <P>COPYRIGHT: (C)2003,JPO |
