| 摘要 |
PURPOSE:To obtain speediness and a large variable amount of light diffusivity by composing a light diffusing element of an elastic body and a member which has numbers of fine openings, and either projecting or drawing the elastic body from said fine openings and making the light diffusivity variable. CONSTITUTION:Surfaces in the openings 2 of a elastic body 3 are held nearly plane and incident luminous flux is transmitted through the elastic body 3 without being diverged by the surfaces in the openings 2. When pressure is applied to a movable part 4, the elastic body 3 projects from the opening 2 to form extremely small convex surfaces. Consequently, an incident luminous flux 5 is diverged by the formed convex surfaces to obtain light diffusivity on the whole. At this time, the convex forms of the surfaces vary according to the pressure applied to the movable part 4, so the intensity of the light diffusivity is varied. Further, pressure may be applied to the member having the fine openings while the movable part 4 is fixed. |
