Wide-angle and low-distortion on-vehicle lens

Abstract

The invention discloses a wide-angle and low-distortion on-vehicle lens which comprises a first lens element, a second lens element, a third lens element and a fourth lens element which are arranged sequentially from an object. A diaphragm is arranged between the third lens element and the fourth lens element, and the first lens element and the second lens element are both provided with a falcate lens which has negative focal power and is convex towards the object; the third lens element and the fourth lens element are both provided with a biconvex lens with positive focal power; and the second element lens and the fourth lens element are both aspherical. Even under fewer lens group condition, the weight of lens group is reduced, the cost is reduced, simultaneously, wide-angle, wide relative aperture, low distortion and longer total lens length can also be realized, the optical aberration in an optical system can be effectively corrected so as to achieve satisfied optical characteristics and wider total viewing angle, thereby meeting the special application requirement of a built-in on-vehicle camera.

Description

technical field [0001] The invention relates to a wide-angle lens for a vehicle, in particular to a vehicle lens with a large wide-angle and small distortion. Background technique [0002] Various vehicle devices include passenger cars, trucks, motorcycles, etc. in the car. In order to ensure the safety of the driver when reversing and avoid damage caused by collision with cars, people or other objects, the original The wide-angle lens is only used for cameras, through which the images of external objects are captured and transmitted through the line for the driver sitting in the cab to watch and judge, ensuring the safety between the vehicle and other objects. But the wide-angle lens that vehicle-mounted camera is used at present generally adopts 5 to 8 glass lenses to form, and the wide-angle lens that is 200710201261. Heavy, high cost, and when the field of view exceeds 90°, the distortion will be very serious. For this reason, the wide-angle lens developed by Japanese c...

AI Technical Summary

Problems solved by technology

But the wide-angle lens that vehicle-mounted camera is used at present generally adopts 5 to 8 glass lenses to form, and the wide-angle lens that is 200710201261. Heavy, high cost, and when the field of view exceeds 90°, the distortion will be very serious. For this reason, the wide-angle lens developed by Japanese companies uses aspheric technology to reduce weight, cost and deformation, as shown in Chinese patent documents The wide-angle lens published in 200610074775.9 is composed of 4 lenses, including 2 to 3 aspherical lenses, but the light transmission performance of this lens is weak, especially with the reduction of the number of lenses, the length of the lens is relatively short. Suitable for camera systems that generally have specific requirements for lens length

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