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IMAGING LENS COMPOSED OF SIX OPTICAL ELEMENTS

  • US 20150241665A1
  • Filed: 02/23/2015
  • Published: 08/27/2015
  • Est. Priority Date: 02/24/2014
  • Status: Active Grant
First Claim
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1. An imaging lens composed of six optical elements which forms an image of an object on a solid-state image sensor, in which the elements are arranged in order from an object side to an image side, comprising:

  • a first optical element group with positive refractive power includinga first lens with positive refractive power having a convex surface on the object side as a first optical element; and

    a second lens with negative refractive power having a concave surface on the image side as a second optical element;

    a second optical element group with positive refractive power including a third lens with positive refractive power having a convex surface on the image side as a third optical element; and

    a third optical element group with negative refractive power includinga fourth double-sided aspheric lens with negative refractive power having a concave surface on the image side as a fourth optical element; and

    a fifth double-sided aspheric lens having a concave surface on the object side as a fifth optical element, whereinthe image-side surface of the fourth lens has at least one pole-change point off an optical axis; and

    as a sixth optical element, a double-sided aspheric aberration correction optical element with virtually no refractive power is located in an air gap between the first optical element group and the second optical element group.

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