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US 7,254,323 B2Granted
Illumination optical system, illumination device and image-taking apparatus
AssigneeCanon Kabushiki Kaisha
InventorYoshiharu Tenmyo
Life of this patent
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Abstract
An illumination optical system is disclosed, which leads a luminous flux forward effectively, which emitted backward from a light source. The illumination optical system comprises a light source, and a first optical member arranged on an opposite side of a light irradiation side with respect to the light source. The first optical member includes a refractive surface through which light from the light source is transmitted and a reflective surface which reflects the light from the refractive surface toward the light irradiation side.
Claims12
An illumination optical system comprising:
- a light source;
- and
- a first optical member arranged on an opposite side to a light irradiation side of the optical system with respect to the light source,
- wherein the first optical member includes a refractive surface through which light from the light source is transmitted and a reflective surface which totally reflects the light from the refractive surface toward the light irradiation side, and
- wherein the first optical member includes as the reflective surface a first reflective surface which totally reflects the light from the refractive surface, and a second reflective surface which totally reflects the light from the first reflective surface toward the light irradiation side, the light reflected by the first reflective surface proceeding to the second reflective surface without emerging out from the refractive surface.
2 more elements
Dependencies are inferred from the claim text.