| 摘要 |
Provided are an illumination device and a lens employed in the device for controlling light travelling direction, the device being capable of illuminating brightly and uniformly a certain limited region (region-to-be-illuminated) corresponding to an object such as subject for photography. The illumination device emits light H coming from a light emitting element (point-like light source) employing a LED as a light emitting source via the lens. A light control emission face of the lens emits light (rays), which is included in light H introduced into the lens through an incidence face thereof and travelling within the lens to the light control emission face without undergoing inner-reflection at any surface of the light control emission face, as illumination light. The light control emission face is configured so that no set of rays included in the illumination light make any crossover at least before reaching a region-to-be-illuminated and rays within a direction range near to a direction of optical axis L have lower light flux density as compared with that in the outside of the direction range.
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