Vehicle-mounted wide-angle lens

Abstract

A vehicle-mounted wide-angle lens comprises a first lens of a negative focal power, a second lens of a negative focal power, a third lens of a negative focal power, a fourth lens of a positive focal power, a fifth lens of a negative focal power, a sixth lens of a positive focal power and a seventh lens of a positive focal power successively from the object plane to the image plane; an aperture diaphragm is arranged between the fourth and the fifth lenses; protective glass and an optical filter are configured between the seventh lens and the image plane; the image plane is provided with light reception surfaces of solid shooting components as CCD and CMOS; the first, second and third lenses are falcate lenses which bend towards the image plane; the fifth and sixth lenses are combined into a glued lens, and a gluing side of the glued lens bends towards the image plane; the fourth and fifth lenses are glass lenses of high refractive indexes respectively; and the first, second, third, sixth and seventh lenses are glass lenses of low dispersion.

Description

technical field [0001] The invention relates to a wide-angle lens for a vehicle, especially a wide-angle vehicle lens with a large relative aperture Background technique [0002] With the rapid development of society and the rapid improvement of people's living standards, people have attached great importance to safety awareness, which is also reflected in the field of vehicle lenses in the automotive industry. Car cameras include driving record shots at the front of the car, reversing shots at the rear of the car, and other shots around the car, etc. Their existence can not only provide evidence for personnel disputes, but also protect their own lives and property. With the continuous development of vehicle-mounted lenses, wide-angle lenses for driving records have gradually become popular in the devices of various vehicles such as passenger cars, trucks, and private cars. The images of external objects are captured through this lens, and through certain data processing and...

AI Technical Summary

Problems solved by technology

Existing vehicle-mounted wide-angle lenses have relatively small relative apertures at wide angles. Although the wide-angle vehicle-mounted lenses described in the patent document (101561550) have a wide angle of more than 120°, their FNo (reciprocal of the square aperture) is 2. It is difficult to have better performance in dark environments such as rainy days and nights

[0007] 2. The peripheral image quality is poor and the brightness is low

At the same time, the peripheral brightness ratio of an optical system also affects the imaging quality. An optical system with a low peripheral brightness ratio will have vignetting at the edge of the imaging surface, which will affect the user's observation.

The existing wide-angle lenses for vehicles on the market generally have poor edge quality and vignetting. This is because aberrations such as chromatic aberration and field curvature distortion have not been optimized, and the peripheral brightness ratio has not been improved.

[0009] 3. Low resolution

[0010] Most of the existing vehicle-mounted wide-angle lenses on the market are 1.3 million pixels. Although they can record the situation in front of the car, when encountering an emergency and want to investigate the details, the relevant details are often lost because the resolution cannot meet the requirements, making the driving record lost its meaning

[0011] 4. Processing is difficult and costly

[0012] Most of the lenses with better resolution on the market use aspheric technology. The existing domestic processing level is difficult to meet the manufacturing requirements. Therefore, aspheric lens materials specially customized by foreign manufacturers are often used, which increases the production cost.

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