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Decentered prism optical system

  • US 6,034,823 A
  • Filed: 02/25/1997
  • Issued: 03/07/2000
  • Est. Priority Date: 02/07/1997
  • Status: Expired due to Term
First Claim
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1. A decentered prism optical system comprising at least three surfaces which are decentered with respect to each other, wherein a space between said at least three surfaces is filled with a transparent medium having a refractive index not smaller than 1.3,wherein at least two of said at least three surfaces are reflecting surfaces arranged so that at least two internal reflections take place in said optical system, andwherein said at least two reflecting surfaces are disposed such that light rays reflected by these surfaces do not intersect each other in said optical system, andwherein one of said at least two reflecting surfaces is a rotationally asymmetric surface having no axis of rotational symmetry and only one plane of symmetry, and at least one other of said reflecting surfaces is arranged such that at least an effective surface thereof having an area that transmits and/or reflects a bundle of light rays in an entire area of the effective surface is formed from a rotationally symmetric surface having an axis of rotational symmetry intercepting the effective surface.

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