Ultra wide angle micro optical lens

Abstract

The invention discloses an ultra wide angle micro optical lens. The optical lens comprises a first lens element, a second lens element, a third lens element and a fourth lens element which are sequentially arranged from an object; an orifice plate is arranged between the third lens element and the fourth lens element; the first lens element and the second lens element are provided with meniscus lenses which have negative focal power and are protruded towards the object; the third lens element and the fourth lens element are provided with biconvex lenses with positive focus power; and the second lens element and the fourth lens element are of aspheric surfaces. The ultra wide angle micro optical lens only uses four lenses, thereby reducing the weight of the lenses, reducing the cost, effectively correcting the errors in the optical system, and achieving satisfactory optical characteristics and wider angle of the total view field by using minimum lenses; and moreover, the total length of the ultrathin lenses is less than or equal to 14 mm, so that the special application requirements on an embedded vehicle mounted camera are met.

Description

Technical field [0001] The invention relates to an optical lens system, particularly an ultra-wide-angle miniature optical lens suitable for monitoring, vehicle-mounted cameras and vehicle-mounted imaging systems. Background technique [0002] Various vehicle devices include passenger cars, trucks, motorcycles, etc. in automobiles. In order to ensure the safety of the driver when reversing and avoid collisions with cars, people or other objects, the original installation The wide-angle lens used only for the camera, through which the picture of external objects is captured, and the driver sitting in the cab can be viewed and judged through the transmission line to ensure the safety between the vehicle and other objects. However, the current wide-angle lens used in vehicle cameras generally consists of 5 to 8 glass lenses. For example, the wide-angle lens with the patent application number 200710201261.X published in the Chinese patent literature uses 6 glass lenses, but this wide...

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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 aspheric lenses, but the light transmission performance of this lens is weak, especially with the reduction of the number of lenses, the field of view angle is not large enough, And the size is large, not suitable for camera systems that generally require shorter lens lengths

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