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Optical system, and image pick-up apparatus using the same

  • US 7,206,126 B2
  • Filed: 01/24/2005
  • Issued: 04/17/2007
  • Est. Priority Date: 01/30/2004
  • Status: Expired due to Fees
First Claim
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1. An optical system comprising:

  • a diffractive optical element; and

    an optical member for suppressing incidence of ultraviolet radiation on the diffractive optical element, the optical member being disposed on light incident side of the diffractive optical element,wherein a conditional expression, 0.1<

    |fu|/f<

    2, is satisfied, where fu and f represent focal lengths of the optical member and the entire optical system, respectively.

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