| 摘要 |
<p>The device has a light source e.g. electroluminescent diode, emitting a light beam propagated in an optical guide (G). The optical guide has an output face (FS) for outputting the light beam and a reflection face (FR) for reflecting the light beam. The optical guide is associated to a reflecting screen which is arranged opposite to the reflection face provided with reflecting prisms (PR). Distance between the screen and the reflection face is comprised between 1-5 millimeters, where the reflection face is with base of titanium oxide or transparent polycarbonate polymer.</p> |
