Patent ID: 10495846

Abstract:
An ultra-wide-angle and large-aperture optical lens assembly with a high image quality is provided, including: a first lens, a second lens, a third lens, a fourth lens, and a filter which are arranged sequentially from an object side to an image side, and a diaphragm arranged between the second lens and the object side. The first lens has a positive focal power and includes a convex surface facing toward the image side. The second lens has a negative focal power and includes a concave surface facing toward the object side. The third lens has a positive focal power. The fourth lens has a negative focal power and has an object side surface and an image side surface both being aspheric surfaces, the object side surface of the fourth lens is arranged with an inflexion point. The lens assembly meets the relational expressions: 0.9<TTL/f1<2.5, 0.5<f/|f4|<1.6, and 0.4<D4/D1<0.9.