Optical lens system

Abstract

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 accordingto 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, and the sensor-side surface of the first lens is concave at a radical axis. The second lens hasa 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 negative 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. Thetais a viewing angle in a diagonal direction of the optical lens system. the 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>-1.4<tan[theta] / f<-1.14.0<TTL / BFL<6.0.

Description

technical field [0001] The present invention relates to a lens optical system, and more specifically, to a lens optical system mountable in a camera module for imaging. Background technique [0002] The camera module for imaging includes: a lens optical system including at least one lens; and an image sensor that receives light passing through the lens optical system and converts it into an electrical signal. Generally, a solid-state imaging element such as a charge coupled device (CCD) or a complementary metal oxide semiconductor image sensor (complementary metal oxide semiconductor image sensor, CMOS image sensor) is widely used as an image sensor. [0003] Recent camera modules are widely used in smart phones, PDAs, laptops, and other electronic devices. In order to improve the convenience and aesthetic feeling of users, such electronic devices tend to be gradually miniaturized and thinned. In addition, existing camera devices tend to be smaller and thinner. Therefore,...

AI Technical Summary

Problems solved by technology

However, it is difficult to design a lens that has a wide image angle, can be used in combination with a high-definition image sensor, and has excellent optical performance such as aberration and distortion.

Images