EXPOSING APPARATUS AND IMAGE FORMING APPARATUS USING ORGANIC ELECTROLUMINESCENCE ELEMENT

摘要

A light source includes a light emitting unit including a light emitting layer (4) for electrically emitting a light, and a waveguide (6) for emitting a light irradiated from the light emitting unit into air through a light take-out surface formed on an end face, wherein an area of the light take-out surface of the waveguide is set to be smaller than that of the light emitting layer. Thus, the light irradiated from the light emitting layer is emitted through the light take-out surface of the waveguide. Therefore, it is possible to freely determine the size of the light source by the size of the light take-out surface of the waveguide. Consequently, it is possible to easily obtain a very small light source.