| 摘要 |
An arrangement and method for providing an elongated light source, such as for illuminating a sign or the like or, for other display, which includes emitting light from an exterior light source into an inner tube having a portion lined with a high reflectance film of prismatic lenses, the tube having a light-transition opening along its length, with a diffusing medium substantially diametrically opposite such opening, and optionally a reflector at one end of the inner tube. The inner tube is concentrically surrounded by an outer tube having light-transmissive portions of different colors. The outer tube is rotatable relative to the inner tube. The emitted light propagates in the inner tube by reflecting from the high reflectance lining and the reflector to impinge on the diffusing medium and thereby transmit light outwardly through the light-transmissive opening and thereafter through a selected one of the colored portions so as to project colored light against a sign or like object. The arrangement and method may be used as a color display, for both ambient-light and internal illumination, by interspersing the light-transmissive portions with opaque portions of substantially the same color. Several units may be placed end to end to provide a color-code display.
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