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Lens system and optical device having the same

  • US 6,924,949 B2
  • Filed: 05/10/2001
  • Issued: 08/02/2005
  • Est. Priority Date: 05/12/2000
  • Status: Expired due to Fees
First Claim
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1. An imaging lens system for imaging an object onto image taking means, the imaging lens system comprising:

  • a plurality of lenses and a stop, wherein a diffractive surface is present in the imaging lens system, the imaging lens system moving the whole or part of the imaging lens system during focusing for a distance to an object from an infinity side to a near side and satisfying the following conditions;




    |≧

    0.5,


    S/f|≧

    1.0, where β

    is a maximum imaging magnification, Δ

    S is a maximum moving distance of the whole or part of the imaging lens system during focusing from an object at infinity to an object at a near distance, and f is a focal length of the entire imaging lens system.

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