MINIATURE TELEPHOTO LENS ASSEMBLY

摘要

An optical lens assembly includes five lens elements and provides a TTL/EFL<1.0. In an embodiment, the focal length of the first lens element f1

主权项

1. An optical lens assembly comprising, in order from an object side to an image side:
a) a first lens element with positive refractive power having a convex object-side surface; b) a second lens element with negative refractive power having a thickness d2 on an optical axis and separated from the first lens element by a first air gap; c) a third lens element with negative refractive power and separated from the second lens element by a second air gap; d) a fourth lens element having a positive refractive power and separated from the third lens element by a third air gap; and e) a fifth lens element having a negative refractive power, separated from the fourth lens element by a fourth air gap and having a thickness d5 on the optical axis;
wherein a ratio between an effective focal length (EFL) and a total track length (TTL) of an optical lens system including the lens assembly is smaller than 1.0, wherein a focal length f1 of the first lens element is smaller than TTL/2 and wherein the third air gap is greater than TTL/5.