| 摘要 |
PURPOSE: To make it possible to project a geometrical light spot and a ring on a screen or the like using a simple device by making radiation from a wave source be reflected zero to plural times through the combination of reflectors. CONSTITUTION: A small type bulb 3 as a light source is set in the lower center of a cylinder 1 of a cylindrical reflector structure with a mirror finish inner face. Light from a light source divided into the direct light 4 reaching the screen on a ceiling directly from an opening 7, the one time reflection light 5 reflected one time by the inner face, outgoing aslant out of the opening 7, and reaching the screen, and likewise the two times reflection light 6 reflected two times by the inner face, outgoing with further slanting angle out of the opening 7, and reaching the screen. Some others outgo out of the opening 7 after three or more times reflection. Accordingly, the rainbow-colored ring and spot can be projected when a concentric circle-like multicolored color filter is used instead of a diaphragm plate with a hole 2. That is, multiple effects can be obtained by a basically simple structure. |
