| 摘要 |
<p>A laser beam is controlled by scanning a line pattern and modulating laser beam power by a frequency proportional to the line pattern so that the input laser power with amplitude variations proportional to the desired figure burns at different depths (d,d') for providing a relief of the figure in the sign. Preferably the lines of the pattern are separated from one another by a distance (a) equal to the length of the screen pattern created by the laser. The resulting sign is edge illuminated, e.g. by LEDs. An independent claim is also included for edge-illuminated electric sign.</p> |
