SURFACE ILLUMINATION METHOD USING POINT LIGHT SOURCE, LINEAR LIGHT SOURCE DEVICE, AND SURFACE ILLUMINATION DEVICE USING LINEAR LIGHT SOURCE DEVICE

摘要

A surface illumination device includes: a point light source I having high directionality; a linear light conversion unit II that converts light from the point light source into linear light; a linear light diffusion unit III that diffuses the linear light; and a surface lighting unit IV that is irradiated with diffused light and outputs surface light. The light from the point light source I is converted into the linear light by the linear light conversion unit II. The linear light thus converted is diffused in a predetermined direction by the linear light diffusion unit III. The diffused light is radiated on the surface lighting unit IV to be converted into surface light and radiated.