Mirror converging-type illumination optical system

Details Mirror converging-type illumination optical system Mirror converging-type illumination optical system

1984-02-02

1987-01-20

Corbin, John K.

350523, G02B 2106

Patent

active

046376917

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.

REFERENCES:
patent: 3547526, Devereux
patent: 4498742 (1985-02-01), Uehara

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