Importance

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Abstract

An optical system for 360.degree. image transfer in which spaced primary secondary hyperbolically surfaced mirrors are combined with a refractive lens system and are held in spaced relation by a transparent envelope having inner and outer surfaces generated from the near focal point of the primary mirror to avoid image impairing aberrations, and in which the mirrors are so spaced and concentrically arranged that the entrance pupil of the lens system coincides with the near focal point of the primary mirror, which is centrally apertured to form an aperture diaphragm, and the near focal point of the secondary mirror approximates the apex of the primary mirror, the far focal points of the mirrors coinciding to form a confocal set of mirrors. The refractive lens system, in turn, consists of four lens groups, the first lens group of which bends chief rays of image forming light approximately parallel to an optical axis and corrects for field curvature, the second lens group of which corrects for primary and secondary color, the third lens group of which bends the chief rays towards an image plane and provides additional field curvature and secondary color correction, and the fourth lens group of which provides additional secondary color correction and renders the chief rays incident upon the image plane at an angle of approximately 90.degree..

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First Claim