Illumination device for a reflective sign, illuminated sign assembly and support

摘要

A lighting unit for a retroreflective screen bearing a legend comprises a planar extended optical fiber for placing in front of the screen (56) to provide homogeneous illumination by means of light passing along the fiber. At least two candela per square meter of illumination are provided and the retroreflectivity of the screen through the lighting unit is not reduced by more than 60%, preferably not more than 30%. Independent claims are also included for the following: (A) A screen comprising the above;and (B) A mount for a motor vehicle number plate as above.