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FIXED-FOCUS LENS AND APPARATUS INTEGRATING OPTICAL PROJECTION AND IMAGE DETECTION

  • US 20100231873A1
  • Filed: 09/15/2009
  • Published: 09/16/2010
  • Est. Priority Date: 03/12/2009
  • Status: Active Grant
First Claim
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1. A fixed-focus lens adapted to be disposed between an object side and an image side, the fixed-focus lens comprising:

  • a reflector disposed in a light path between the object side and the image side;

    a curved reflector disposed in the light path between the reflector and the image side;

    a first lens group disposed in the light path between the curved reflector and the image side and comprising a first lens and a second lens arranged in sequence from the object side to the image side, wherein each of the first lens and the second lens is an aspheric lens; and

    a second lens group disposed in the light path between the first lens group and the image side and comprising a spherical lens and an aspheric lens, wherein the aspheric lens of the second lens group is closest to the image side in the second lens group,wherein an effective focal length of the fixed-focus lens is f, an effective focal length of the second lens group is f2, a clear aperture of the aspheric lens of the second lens group is D, and the fixed-focus lens satisfies at least one of following conditions;

    0.04<

    f/f2<

    0.078 and 0.05<

    f/D<

    0.18.

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