| 摘要 |
PURPOSE:To make possible the obtaining of uniform plane illumination by combining plural pieces of optical transmission means constituted of plural transparent plate-shaped bodies. CONSTITUTION:The optical transmission means 1 is constituted by laminating the plural transparent plate-shaped bodies having different lengths and forming the same in such a manner that the sectional shape thereof is like a wedge. A long-sized light source L such as fluorescent lamp is disposed along a light incident end 2 of such means 1, then the incident light on the individual transparent plate-shaped bodies constituting the means 1 from the incident end 2 advances between the transparent plate-shaped bodies in the arrow direction and is emitted from a light exit end 3. The light parallel with the transparent plate-shaped bodies advanced rectilinearly and the light inclined with the transparent plate-shaped bodies arrives at the end 3 by repeating reflections in the transparent plate-shaped bodies. Two pieces of such means 1 are combined in such a manner that the wedge-shaped top ends are adjacent to each other and that the exit ends 3 are positioned on the same plane, by which the approximately uniform plane illumination with a large area is obtd. |
