Patent ID: 9329373
Filing Date: 2016-05-03
CPC Classification: G02B

Claim Text:
1. A catadioptric optical system comprising: a first catadioptric group configured to form an intermediate image of an object; and a second catadioptric group and a lens group configured to form an object image based on the intermediate image, wherein the first catadioptric group consists of a solid lens having an object-side surface and an image-side surface, wherein the object-side surface includes an input surface provided around an optical axis and an object-side reflective surface provided around the input surface; wherein the image-side surface includes an exit surface provided around the optical axis and an image-side reflective surface provided around the exit surface; wherein a light flux from the object enters the solid lens through the input surface, and undergoes four or more reflections between the image-side reflective surface and the object-side reflective surface, prior to exiting through the exit surface; and wherein: