Patent ID: 8891177

Claim:
An optical imaging system for pickup, sequentially arranged from an object side to an image side 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; a fifth lens element with refractive power; and a plastic sixth lens element with negative refractive power having a concave image-side surface, both object-side surface and image-side surface being aspheric, and the image-side surface having at least one inflection point; wherein the optical imaging system for pickup has a total of six lens elements with refractive power, and wherein 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, and the following relation is satisfied: 1.8 <|f/f 5 |+|f/f 6 |<3.5.