Patent ID: 7607796

Claim:
A light box, comprising: a frame with a base, at least one transparent or translucent sheet ( 9 ) fixed at the base of the frame, stiffening means ( 10 , 10 ′) connecting between opposite sides of the frame, and lighting means, wherein, the frame and the stiffening means are located below the lighting means ( 3 ), with the stiffening means ( 10 ) located close to the lighting means ( 3 ), the stiffening means extends between the opposite sides of the frame at a position located vertically between the transparent or translucent sheet and the lighting means, the stiffening means extends across a lighting path of the lighting means at the position located vertically between the transparent or translucent sheet and the lighting means, and a central part ( 10 b ) of the stiffening means is located within the lighting path of the lighting means at a first vertical distance above the transparent or translucent sheet and at a second vertical distance below the lighting means such that, with the lighting means lighting the transparent or translucent sheet, the lighting means does not project a shadow of the stiffening means onto an inner face of the sheet element.