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Optical Image Capturing System

  • US 20180024319A1
  • Filed: 12/12/2016
  • Published: 01/25/2018
  • Est. Priority Date: 07/21/2016
  • Status: Active Grant
First Claim
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1. An optical image capturing system, from an object side to an image side, comprising:

  • a first lens element with refractive power;

    a second lens element with refractive power;

    a third lens element with refractive power;

    a fourth lens element with refractive power;

    a first image plane, which is an image plane specifically for visible light and perpendicular to an optical axis;

    a through-focus modulation transfer rate (value of MTF) at a first spatial frequency having a maximum value at central field of view of the first image plane; and

    a second image plane, which is an image plane specifically for infrared light and perpendicular to the optical axis;

    the through-focus modulation transfer rate (value of MTF) at the first spatial frequency having a maximum value at central of field of view of the second image plane;

    wherein the optical image capturing system comprises four lens elements with refractive powers, at least one of the four lens elements has positive refractive power;

    focal lengths of the four lens elements are respectively f1, f2, f3 and f4;

    a focal length of the optical image capturing system is f, and an entrance pupil diameter of the optical image capturing system is HEP;

    a distance on the optical axis from an object-side surface of the first lens element to the first image plane is HOS, a distance on the optical axis from the object-side surface of the first lens element to an image-side surface of the fourth lens element is InTL, a maximum effective diameter of the image-side surface of the fourth lens element is denoted by PhiA4, half of a maximum viewable angle of the optical image capturing system is denoted by HAF;

    the optical image capturing system has a maximum image height HOI on the first image plane perpendicular to the optical axis;

    a distance on the optical axis between the first image plane and the second image plane is denoted by FS;

    conditions as follows are satisfied;

    1≦

    f/HEP≦

    10, 0 deg<

    HAF≦

    150 deg, 0<

    PhiA4/InTL≦

    5, and |FS|≦

    30 μ

    m.

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