Patent ID: 9690076
Date: 2017-06-27
CPC Classifications: G02B,H04N

Claim:
1. An optical imaging system for pickup comprising, in order from an object side to an image side: a first lens element having positive refractive power; a second lens element; a third lens element; a fourth lens element having both of an object-side surface and an image-side surface of the fourth lens element being aspheric; a fifth lens element 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 fifth lens element are aspheric; and a sixth lens element 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 for pickup has a total of six lens elements, 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 are all singlet lens elements, an axial distance between an 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: