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Endoscope objective optical system

  • US 6,844,985 B2
  • Filed: 04/03/2003
  • Issued: 01/18/2005
  • Est. Priority Date: 04/05/2002
  • Status: Expired due to Fees
First Claim
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1. An endoscope optical system comprising,an endoscope objective comprising a negative first lens group, a positive second lens group, a positive third lens group, and a negative fourth lens group, in this order from an object, wherein said positive second lens group and said positive third lens group are moved to vary a distance between them (i) at a short focal length extremity and (ii) at a maximum magnification position without changing the overall length from said negative first lens group to an image plane, and the focal length of said endoscope objective is varied while maintaining an in-focus state.

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