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Compact wide angle lens with low distortion

  • US 10,641,993 B1
  • Filed: 01/16/2018
  • Issued: 05/05/2020
  • Est. Priority Date: 01/19/2017
  • Status: Active Grant
First Claim
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1. An optical lens, said lens having an effective focal length, an object end, a field of view, a f-number, a total track length, an image height at maximum field, an optical axis, and, an image plane, and, said optical lens comprising:

  • a. two lens groups located along the optical axis in order from object end to image plane, each lens group having an effective focal length, and,b. the lens groups comprising;

    i. group 1 having positive power, an effective focal length, a refractive index, and, comprised of either a single lens element or a doublet lens element, and,ii. group 2 having positive power, an effective focal length, and, comprising 4 aspheric lens elements, in order from nearest the object end to the image plane, a first lens element, a second lens element, a third lens element, and, a fourth lens element, each lens element made of material having a refractive index and an Abbe number, and, the fourth lens element of group 2 has a complex aspherical image surface, and,c. the focusing power of group 1 is greater than the focusing power of group 2.

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