Illumination device

An illumination device for radiating a predetermined area of light, comprising:

• a rod-shaped transparent radiation member having a proximal end and a distal end, light being received by said proximal end of said radiation member and radiated therefrom in a predetermined range of radial directions along said radiation member, said rod-shaped transparent radiation member being provided with a plurality of light scattering regions having a predetermined area on its surface opposite said directions;
• wherein said plurality of light scattering regions are provided along said radiation member in such a way that a ration of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end of said radiation member,
• wherein said radiation member further includes a transport cladding layer surrounding said radiation member, and a light diffusion layer surrounding said cladding layer.

An illumination device for radiating a predetermined area of light, comprising:

• a rod-shaped transparent radiation member having a proximal end and a distal end, light being received by said proximal end of said radiation member and radiated therefrom in a predetermined range of radial directions along said radiation member, said rod-shaped transparent radiation member being provided with a plurality of light scattering regions having a predetermined area on its surface opposite said directions, said plurality of light scattering regions being provided along said radiation member in such a way that a ration of an area of one region to that of adjacent region becomes larger as said one region becomes distant from said proximal end of said radiation member;
• and
• a transparent radiation plate having a planar side which opposes said radiation member so that said radiated light from said radiation member is coupled into said radiation plate, and radiated from a front surface of said transparent radiation plate.