| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light box device that can simultaneously satisfy uniformity on the surface of an opening part and uniformity in an irradiation angle, and further satisfy greatly utilization efficiency of light. <P>SOLUTION: The light box device includes a light source 1 for irradiating light, a diffusion member 2 for diffusing light irradiated from the light source 1, a first collimating lens 3 which refracts light diffused by the diffusion member 2 to an optical axis side, and a second collimating lens 4 which converts light refracted by the first collimating lens 3 into parallel light. <P>COPYRIGHT: (C)2013,JPO&INPIT |
