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Fixed-focus lens

  • US 8,089,706 B2
  • Filed: 12/15/2010
  • Issued: 01/03/2012
  • Est. Priority Date: 06/01/2010
  • Status: Active Grant
First Claim
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1. A fixed-focus lens, disposed between a magnified side and a minified side and having an optical axis;

  • the fixed-focus lens comprising;

    a reflective system, disposed between the magnified side and the minified side, wherein the reflective system comprises a reflection mirror having a negative refractive power; and

    a refractive system, disposed between the reflection mirror and the minified side and comprising;

    a first lens group, having a positive refractive power; and

    a second lens group, disposed between the first lens group and the minified side and having a positive refractive power,wherein the fixed-focus lens satisfies F/H>

    0.23, where F is an effective focal length and H is an image height.

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