Mirror converging-type illumination optical system
First Claim
1. An illumination optical system for supplying substantially uniform illumination light of a high efficiency, comprising:
- a light source;
light-ray converting means for converting light rays from said light source into parallel light rays, said light-ray converting means having a concave reflecting surface which has an optical axis; and
a refraction member arranged in a path of the parallel light rays, so that said refraction member shifts the incident parallel light rays which are farthest from the optical axis to positions substantially coinciding with the optical axis, and shifts the incident parallel light rays which are nearest to the optical axis to positions substantially farthest from the optical axis, said refraction member having a conical input surface having a convex surface facing toward an incident light ray side and a conical output surface having a convex surface facing toward an exit light ray side, vertices of said conical input and output surfaces being located on the optical axis.
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Accused Products
Abstract
A mirror converging-type illumination optical system for converging light rays from a light source into substantially parallel light rays using a concave reflecting mirror having a secondary curved surface comprises a conical refraction member having a convex conical refraction surface at an input or incident side thereof and another convex conical refraction surface at an output side thereof. The refraction member is arranged in a path of the parallel light rays with a vertex of the conical refraction member being substantially aligned with the optical axis of the illumination optical system. The refraction member inverts the inner and outer portions of the incident parallel light rays. The absence of incident parallel light around the optical axis thereof is corrected to achieve a uniform intensity of light rays.
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Citations
9 Claims
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1. An illumination optical system for supplying substantially uniform illumination light of a high efficiency, comprising:
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a light source; light-ray converting means for converting light rays from said light source into parallel light rays, said light-ray converting means having a concave reflecting surface which has an optical axis; and a refraction member arranged in a path of the parallel light rays, so that said refraction member shifts the incident parallel light rays which are farthest from the optical axis to positions substantially coinciding with the optical axis, and shifts the incident parallel light rays which are nearest to the optical axis to positions substantially farthest from the optical axis, said refraction member having a conical input surface having a convex surface facing toward an incident light ray side and a conical output surface having a convex surface facing toward an exit light ray side, vertices of said conical input and output surfaces being located on the optical axis. - View Dependent Claims (2, 3, 4, 5)
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6. An illumination optical system for supplying substantially uniform illumination light of a high efficiency, comprising:
a light source; - View Dependent Claims (7, 8, 9)
Specification