| 摘要 |
An outer casing (1) encloses a light source (2) and includes a window (1a) as at least a portion of its front surface. A drive mechanism within the casing allows movement of a display panel (V) between a front position in which it is visible through the window but inaccessible, and a rear position in which it is accessible via a panel (4) in the rear surface of the casing. The display panel is supported on a continuous strip which moves around a pair of fixed guide supports (6), e.g. a pair of cylinders, one of which drives the strip by friction engagement with its inner surface. The strip includes an aperture into which the display panel may be attached.
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