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 in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof; a second lens element having refractive power; a third lens element having refractive power; a fourth lens element with positive refractive power having both of an object-side surface and an image-side surface of the fourth lens element being aspheric; a fifth lens element with refractive power having both of an object-side surface and an image-side surface of the fifth lens element being aspheric; and a sixth lens element with refractive power having an image-side surface being concave in a paraxial region thereof, wherein both of an object-side surface and the image-side surface of the sixth lens element are aspheric, the image-side surface of the sixth lens element has at least one inflection point, and the sixth lens element is made of plastic; wherein the optical imaging system has a total of six lens elements with refractive power, 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 an effective photosensitive area of an image sensor is ImgH, a tangent line to the image-side surface of the sixth lens element at an off-axis tangent point is perpendicular to an optical axis, a vertical distance between the tangent point and the optical axis is YC, a focal length of the optical imaging system is f, and the following conditions are satisfied:
TTL/ImgH≦1.65; and0.1