| 摘要 |
A rotary display unit of the type having rotatably mounted, parallel vanes or louvres of triangular cross-section, is arranged to provide a back lit display without an internal light fitting within each vane (120). The vanes (120) are of transparent or translucent material. One end of each vane (120) is rotatably mounted by means of an axially apertured bearing (182). An external dichroic lamp (192) axially aligned with the bearing (182) directs light axially into the vane (120). The vane (120) is lined internally with a material (200) having a structured surface, as by axially extending microprisms (202), which provides a tunnel along which the light is subject to a combination of multiple reflections internally while a proportion of the light is emitted. A particular material disclosed is that manufactured by 3M under the name SOLF. The assembly of vanes may be rotated by a cam drive arrangement at the other end of the vanes remote from the lamps. |
