Patent ID: 8830595

Claim:
An optical imaging system for pickup, sequentially arranged from an object side to an image side with six non-cemented lens elements comprising: a first lens element with positive refractive power, having a convex object-side surface; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with refractive power, both object-side and image-side surfaces of the fourth lens element being aspheric; a fifth lens element with refractive power, both object-side and image-side surfaces of the fifth lens element being aspheric; and a plastic sixth lens element with refractive power having a concave image-side surface, both object-side and image-side surfaces of the sixth lens element being aspheric, and the image-side surface of the sixth lens element having at least one inflection point; wherein the optical imaging system for pickup further comprises a stop disposed between an imaged object and the third lens element, TTL is an axial distance from the object-side surface of the first lens element to an image plane, ImgH is a maximum image height of the optical imaging system, f is a focal length of the optical imaging system for pickup, f 5 is a focal length of the fifth lens element, f 6 is a focal length of the sixth lens element, Y C is a vertical distance between an outermost horizontal vertex of the image side surface of the sixth lens element and an optical axis, and the following relation is satisfied: Y C /f< 0.8; | f/f 5 |+|f/f 6 |<3.5; and TTL/ImgH< 2.1.