LENS SYSTEM

摘要

Compact narrow angle lens systems that may be used in small form factor cameras. The lens system may include six lens elements with refractive power, and may provide lower F-numbers while maintaining or improving imaging quality and package size when compared to other compact lens systems. Total track length of the lens system may be 6.5 millimeters or less, for example 5.9 or 6 millimeters. Focal length of the lens system may be 7.0 millimeters or less, for example 6.6 millimeters. The lens system may include an aperture stop located behind the front vertex of the lens system, for example between the first and second lens elements, that effectively moves the ideal principal point of the camera to in front of the front vertex. The lens system may provide a focal ratio of 2.8 or less, for example 2.6 or 2.4.

主权项

1. A lens system, comprising:
a plurality of refractive lens elements arranged along an optical axis of the lens system, wherein the plurality of lens elements includes, in order along the optical axis from an object side to an image side:
a first lens element with positive refractive power having a convex object side surface;a second lens element with negative refractive power having a concave image side surface;a third lens element;a fourth lens element with negative refractive power;a fifth lens element; anda sixth lens element with positive refractive power having a convex image side surface; wherein the lens system has effective focal length f within a range of 7.0 millimeters or less, and wherein total track length (TTL) of the lens system is 6.5 millimeters or less.