Patent ID: 7806578

Claim:
An illumination device, comprising: a plurality of light guide bodies which are sheet-like, each of the light guide bodies having at least one light emitting region formed by providing a pattern of a light reflection/scattering treatment on a part of a bottom face of each of the light guide bodies, wherein the light emitting regions of the light guide bodies have different patterns from one another; a plurality of light sources individually connected to end portions of the light guide bodies, the light sources radiating each of the bottom faces of the light guide bodies; and a control unit which changes the intensity of a light made incident from each of the light sources to each of the light guide bodies; wherein and the pattern of the distribution of brightness on the light-emitting face changes depending on an individual emitting of each of the light guide bodies; the control unit allows the intensity of the light made incident from each of the light sources to each of the light guide bodies to change with the lapse of time; and the light emitting region of the whole of the light guide bodies is uniform in brightness when all of the light guide bodies are respectively allowed to emit light of a specific intensity.