Wide-angle lens

Abstract

The invention discloses a wide-angle lens. The wide-angle lens sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens along an optical axis from an object side to an image surface, wherein the first lens has a negative focal power, the second lens has a negative focal power, the third lens has a positive focal power, the fourth lens has a positive focal power, the fifth lens has a negative focal power, the fourth lens and the fifth lens are combined to form a lens group, the sixth lens has a positive focal power, the first lens and the third lens both are glass spherical lenses, the second lens, the fourth lens, the fifth lens and the sixth lens are all plastic non-spherical lenses, the wide-angle lens conforms to a condition formula of 1.5<TTL / R3<3, TTL expresses optical overall length of the wide-angle lens, and R3 expresses curvature radius of an object side surface of the second lens. The wide-angle lens has the advantages of miniaturization, low cost, large wide angle and the like and can have favorable resolution in an outer extremely-severe environment.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a wide-angle lens. Background technique [0002] The vehicle surround view system is composed of four ultra-wide-angle cameras installed on the front, rear, left, and right sides of the vehicle body, and simultaneously collects images around the vehicle. After image processing, the images are finally spliced ​​into a seamless 360° panoramic view of the vehicle. Observe the surrounding road conditions to improve the safety index of driving. The vehicle-mounted surround view system greatly expands the driver's perception of the surroundings and the environment, enabling the driver to be calm and relaxed when dealing with situations such as starting, turning, parking, meeting vehicles in narrow lanes, and avoiding obstacles. Reduce the occurrence of accidents such as scratches and even collisions and crushing. [0003] Since the vehicle-mounted surround view system is appli...

AI Technical Summary

Problems solved by technology

At present, in order to pursue large wide-angle and good thermal stability, general vehicle-mounted lenses generally use all-glass lenses, which leads to large lens volume and high cost, which is not conducive to market promotion and application.

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