Optical imaging system for pickup

摘要

An optical imaging system for pickup, sequentially arranged from an object side to an image side, comprising: the first lens element with positive refractive power having a convex object-side surface, the second lens element with refractive power, the third lens element with refractive power, the fourth lens element with refractive power, the fifth lens element with refractive power; the sixth lens element made of plastic, the sixth lens with refractive power having a concave image-side surface with both being aspheric, and the image-side surface having at least one inflection point.

主权项

1. An optical imaging system for pickup comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex at a paraxial position; a second lens element having an image-side surface being concave at a paraxial position; a third lens element having an object-side surface and an image-side surface being both aspheric; a fourth lens element having an object-side surface and an image-side surface being both aspheric; a fifth lens element having an object-side surface and an image-side surface being both aspheric; and a sixth lens element with negative refractive power having an image-side surface being concave at a paraxial position, wherein the image-side surface of the sixth lens element has at least one inflection point, an object-side surface and the image-side surface of the sixth lens element are both aspheric; wherein the optical imaging system for pickup has a total of six lens elements and further comprises an image sensor with an effective photosensitive area, each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is a single and non-cemented lens element, and a central thickness of the sixth lens element is larger than a central thickness of the fifth lens element; an axial distance between the object-side surface of the first lens element and an image plane is TTL, half of a diagonal length of the effective photosensitive area of the image sensor is ImgH, and the following condition is satisfied:
TTL/ImgH<2.1.