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Optical system for endoscopes

  • US 5,793,539 A
  • Filed: 12/27/1994
  • Issued: 08/11/1998
  • Est. Priority Date: 12/27/1993
  • Status: Expired due to Term
First Claim
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1. An optical system comprising:

  • a stop means having a variable aperture and a lens system;

    wherein said optical system produces aberrations which are controlled so as to prevent an image surface thereof from shifting from the object side to the image side by narrowing the aperture of said stop means.

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