Optical imaging system
AssigneeZhejiang Sunny Optical Co., Ltd
InventorsLin Huang, Xinquan Wang
Life of this patent
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Abstract
The present disclosure discloses an optical imaging system. The imaging system sequentially includes, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, and a fourth lens. The first lens has a negative refractive power; the second lens has a positive refractive power or a negative refractive power; the third lens has a positive refractive power or a negative refractive power, and an image-side surface of the third lens is a concave surface; the fourth lens has a positive refractive power, and an image-side surface of the fourth lens is a concave surface. A total effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD≤1.60.
Claims20
An optical imaging system, comprising sequentially, from an object side to an image side along an optical axis:
- a first lens, a second lens, a third lens, and a fourth lens,
- wherein the first lens has a negative refractive power;
- the second lens has a positive refractive power or a negative refractive power;
- the third lens has a positive refractive power or a negative refractive power, and an image-side surface of the third lens is a concave surface;
- the fourth lens has a positive refractive power, and an image-side surface of the fourth lens is a concave surface;
- and
- a total effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy:
- f/EPD≤1.60.
An optical imaging system, comprising sequentially, from an object side to an image side along an optical axis:
- a first lens, a second lens, a third lens, and a fourth lens,
- wherein the first lens has a negative refractive power;
- the second lens has a positive refractive power or a negative refractive power;
- the third lens has a positive refractive power or a negative refractive power, and an image-side surface of the third lens is a concave surface;
- the fourth lens has a positive refractive power, and an image-side surface of the fourth lens is a concave surface;
- and
- a distance TTL from a center of an object-side surface of the first lens to an image plane of the optical imaging system on the optical axis and an entrance pupil diameter EPD of the optical imaging system satisfy:
- 1.0<TTL/EPD<2.5.
Dependencies are inferred from the claim text.