| 摘要 |
An illuminated device (10) comprises a light source (15) and an illumination plate (16), having a first face (18) and a second face (20), separated by edges (22, 24, 26 and 28), and a diffusion cover (32), having an inner surfa ce (34). The diffusion cover (32) overlies the illumination plate (16) and is shaped to form an enclosure (38) defined by the inner surface (34) and the first face (18). The light source (15) delivers light into the illumination plate via the edges (22, 24, 26 and 28). The light undergoes scattering or primary diffusion within the plate, before emerging from the first face (18) at shallow angles, into the enclosure (38). A reflective layer (44) prevents light emerging from the second face (20). Within the enclosure (38), the lig ht undergoes secondary diffusion to provide uniform illumination of the cover (32) and a colour, graphic or message (42) superposed thereon.
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