Optical imaging system
AssigneeZhejiang Sunny Optical Co., Ltd
InventorsXiaofang Wang, Guijie Zhu, Biao Xu, Qi Chen, Kaiyuan Zhang, Fujian Dai, Liefeng Zhao
Life of this patent
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Abstract
An optical imaging system includes an optical lens group including, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, and a fourth lens; a lens barrel, the optical lens group is accommodated in the lens barrel; and a plurality of spacers including at least two spacers disposed between the third lens and the fourth lens; the diameter D of the lens barrel at an end towards the object side and a maximum effective radius DT11 of an object-side surface of the first lens satisfy 2×DT11/D≥0.5.
Claims18
An optical imaging system comprising:
- an optical lens group, from an object side to an image side along an optical axis sequentially including a first lens, a second lens, a third lens, and a fourth lens;
- a lens barrel, the lens barrel being for accommodating the optical lens group;
- and
- a plurality of spacers, the plurality of spacers including at least two spacers disposed between the third lens and the fourth lens;
- a diameter D of the lens barrel at an end towards the object side and a maximum effective radius DT11 of an object-side surface of the first lens satisfy 2×DT11/D≥0.5;
- wherein an effective focal length f3 of the third lens and a radius of curvature R6 of an image-side surface of the third lens satisfy −0.8<R6/f3<−0.3.
An optical imaging system, the optical imaging system comprising an optical lens group;
- the optical lens group, along an optical axis from an object side to an image side sequentially includes a first lens, a second lens, a third lens, and a fourth lens;
- a maximum effective radius DT12 of an image-side surface of the first lens and an edge thickness ET1 of the first lens satisfy 0.4<ET1/DT12<0.9;
- wherein a radius of curvature R1 of an object-side surface of the first lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy 0.2<R8/R1<0.7;
- wherein the first lens has a positive refractive power and an object-side surface thereof is convex;
- the second lens has a negative refractive power;
- the third lens has a positive refractive power, and an image-side surface thereof is convex;
- the fourth lens has a negative refractive power and an image-side surface thereof is concave.
Dependencies are inferred from the claim text.