Optical imaging system
AssigneeZhejiang Sunny Optics Co., Ltd.
InventorsZhanfei ZHANG, Lin Huang, Xin Zhou, Fujian Dai, Liefeng Zhao
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Abstract
An optical imaging system includes, sequentially from an object side to an image side along an optical axis, a first lens (L1) having a positive refractive power and a convex object-side surface (S1); a second lens (L2) having a refractive power; a third lens (L3) having a refractive power; a fourth lens (L4) having a positive refractive power, a concave object-side surface (S7) and a convex image-side surface (S8); and a fifth lens (L5) having a negative refractive power.
Claims20
An optical imaging system, sequentially from an object side to an image side along an optical axis, comprising:
- a first lens having a positive refractive power and a convex object-side surface;
- a second lens having a refractive power;
- a third lens having a refractive power;
- a fourth lens having a positive refractive power, a concave object-side surface and a convex image-side surface;
- and
- a fifth lens having a negative refractive power,
- wherein −1<(SAG42+SAG51)/Tr7r10<−0.3,
- where SAG42 is an axial distance from an intersection of the image-side surface of the fourth lens and the optical axis to a vertex of an effective radius of the image-side surface of the fourth lens, SAG51 is an axial distance from an intersection of an object-side surface of the fifth lens and the optical axis to a vertex of an effective radius of the object-side surface of the fifth lens, and Tr7r10 is a distance along the optical axis from the object-side surface of the fourth lens to an image-side surface of the fifth lens.
An optical imaging system, sequentially from an object side to an image side along an optical axis, comprising:
- a first lens having a positive refractive power and a convex object-side surface;
- a second lens having a refractive power;
- a third lens having a refractive power;
- a fourth lens having a positive refractive power, a concave object-side surface and a convex image-side surface;
- and
- a fifth lens having a negative refractive power,
- wherein f×TTL/EPD<6 mm, and
- f/EPD<1.5,
- where f is a total effective focal length of the optical imaging system, EPD is an entrance pupil diameter of the optical imaging system, and TTL is a distance along the optical axis from the object-side surface of the first lens to an imaging plane of the optical imaging system.
Dependencies are inferred from the claim text.