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Optical system and optical apparatus

  • US 5,940,218 A
  • Filed: 06/18/1998
  • Issued: 08/17/1999
  • Est. Priority Date: 08/21/1995
  • Status: Expired due to Term
First Claim
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1. An image-forming optical system which forms an image of an object,said image-forming optical system comprising at least one prism member,wherein said prism member has a first surface, a second surface, and a third surface, said first surface, second surface and third surface facing each other across a medium having a refractive index (n) larger than 1 (n>

  • 1), so that light rays from an object side of said prism member enter said prism member by passing through said first surface and are reflected by said second surface and further reflected by said third surface, and the reflected light rays exit from said prism member by passing through said second surface,wherein both said second surface and said third surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface.

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