Five-piece wide-angle lens module

摘要

A five-piece wide-angle lens module includes a first lens, a second lens, a third lens, a stop, a fourth lens and a fifth lens, which are sequentially arranged from an object side to an image side. The first lens has a negative refractive power, a convex surface on the object side, and a concave surface on the image side. The second lens has a negative refractive power and two concave surfaces on both sides. The third lens has a positive refractive power. The fourth lens has a positive refractive power and two convex surfaces on both sides. The fifth lens has a negative refractive power. Thereby, the five-piece wide-angle lens module can provide good image quality even in the environment with severe temperature changes.

主权项

1. A five-piece wide-angle lens module, comprising in a sequence from an object side to an image side of:
a first lens, having a negative refractive power, a convex surface on the object side and a concave surface on the image side; a second lens, having a negative refractive power and two concave surfaces on the object side and the image side respectively; a third lens, having a positive refractive power; a stop; a fourth lens, having a positive refractive power and two convex surfaces on the object side and the image side respectively; a fifth lens, having a negative refractive power; wherein each of the second lens, the third lens, the fourth lens and the fifth lens has at least one aspheric surface; wherein the five-piece wide-angle lens module satisfies the following relationship:
2<(r8−r9)/(r8+r9)<4.2; wherein r8 is a radius of curvature of the object side of the fourth lens, r9 is a radius of curvature of the image side of the fourth lens.