Optical system for taking image
AssigneeLargan Precision Co., Ltd.
InventorsChun Shan Chen, Ming Ching Lin
Life of this patent
Estimating the term…
Abstract
An optical system for taking image comprises three lens elements with refractive power, from the object side to the image side: a first lens element with negative refractive power, a second lens element with positive refractive power, and a third lens element with positive refractive power, wherein an aperture stop is located behind the first lens element, each of at least two lens elements is provided with at least one aspheric surface. By such arrangements, the optical system can obtain a good image quality, maintain enough back focal length and increase the field of view of the optical system.
Claims8
An optical system for taking image comprising three lens elements with refractive power, from the object side to the image side:
- a first lens element with negative refractive power;
- a second lens element with positive refractive power;
- a third lens element with positive refractive power;
- wherein an aperture stop is located behind the first lens element, any two of the first lens element, the second lens element and the third element are provided with at least one aspheric surface;
- a focal length of the second lens element is f2, a focal length of the optical system is f, and the satisfy the relation:
- 1.2<f/f2<3.0.
Dependencies are inferred from the claim text.