Large-aperture small-distortion optical lens

Abstract

The invention discloses a large-aperture small-distortion optical lens, and the optical lens comprises a front lens group, a diaphragm element, a rear lens group and a light filter, wherein the frontlens group, the diaphragm element, the rear lens group and the light filter are sequentially arranged from the object space to the image space. The front lens group comprises a first lens, a second lens, a third lens and a fourth lens, and the rear lens group comprises a fifth lens, a sixth lens and a seventh lens. The first lens, the third lens and the seventh lens are all spherical lenses, and the fifth lens and the sixth lens are combined to form a bonding lens with the positive focal power. According to the invention, the first, second and seventh lenses are all aspherical lenses, therebyeffectively reducing the volume of the lens, and enabling the structure of the lens to be more compact. The optical lens is small in size, is small in optical distortion, basically has no distortion in image, is high in imaging quality, and is accurate in imaging color.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to an optical lens with large aperture and small distortion. Background technique [0002] With the continuous advancement of automotive driver assistance technology (ADAS), the application of cameras in ADAS systems is becoming more and more extensive. The front-view camera is the most vehicle-mounted front-view camera. It is mainly used for auxiliary functions such as pedestrian collision avoidance, road deviation, and vehicle ranging. Existing camera products cannot meet the requirements of large aperture and small distortion while maintaining a small size and high definition. [0003] For example, Chinese patent 2017100325929 discloses a high-definition fixed-focus lens with super large aperture, which uses eight lenses, including three plastic aspheric lenses, which are small in size and large in aperture, and the use of plastic aspheric lenses can effectively reduce c...

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Problems solved by technology

[0005] However, the lens disclosed in the above-mentioned patent still has the problem of being unable to meet the requirements of large aperture and small distortion at the same time due to uncorrected distortion while maintaining miniaturization and high definition; and due to the use of more plastic aspheric lenses, although the cost Low, but its imaging picture has poor permeability, and its stability is not as good as that of an all-glass lens

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