Transparent drawing board - with synthetic fibre and foil layer for better light diffusion

摘要

A drawing board with transparent illumination through a translucent plate by tubular lamps in the rear light chamber consists of a base plate made of acrylic glass (plexiglass). The top surface carries a two-layer coating. the bottom layer is a tissue of high refractivity with prismatic raised surface elements, made of synthetic fibres. The top layer is a translucent plastic foil, preferably polyester which has been joined to the bottom layer by hot rolling. Such a drawing board requires les light energy and creates less heat, yet has a better light diffusion effect.