OPTICAL LENS SYSTEM

WIPO Patent Application WO/2018/080103

A1

An optical lens system is disclosed. An optical lens system according to the present invention can be installed in a camera module and be used for capturing an image. An optical lens system according to the present invention comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arrayed between an object and a sensor, on which an image of the object forms, sequentially from the object side to the sensor side. The first lens has a negative refractive power. The second lens has a positive refractive power. The third lens has a positive refractive power, and the object-side surface of the third lens is convex at a radical axis. The fourth lens has a refractive power. The object-side surface of the fourth lens is convex at a radical axis and is concave in the periphery within an effective diameter of the radical axis. The sensor-side surface of the fourth lens is concave at the radical axis. The object-side surface and sensor-side surface of the fourth lens are both aspheric surfaces. The fifth lens has a positive refractive power, and the object-side surface of the fifth lens is concave at a radical axis and is an aspheric surface. The sixth lens has a refractive power. The sensor-side surface of the sixth lens is concave and has at least one inflection point within an effective diameter. The object-side surface and sensor-side surface of the sixth lens are both aspheric surfaces. A diaphragm is positioned between the second lens and third lens. Θ is a viewing angle in a diagonal direction of the optical lens system. F is a focal length of the optical lens system. TTL is a length along an optical axis from the object-side surface of the first lens to the sensor. BFL is a length along an optical axis from the sensor-side surface of the sixth lens to the sensor. And the following conditional expressions are satisfied. Conditional expressions: -1.00