Distortionless lens with ultra-large target surface

Abstract

The embodiment of the invention discloses a distortionless lens with an ultra-large target surface. The distortionless lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifthlens, a filter and a photoreceptor which are sequentially arranged from an object plane to an image plane, wherein the first lens is a meniscus lens with a negative focal length, the focal length of the second lens is positive, and the focal length of the third lens is positive; the focal length of the fourth lens is negative, and the focal length of the fifth lens is positive. According to the embodiment of the invention, five lenses are adopted, and the first lens and the fifth lens 5 are aspheric lenses made of plastic materials, so that the weight and the manufacturing cost of the lenses are effectively reduced, and the product competitiveness is improved. By reasonably using the plastic aspheric lenses and limiting the focal power of each lens, the distortion of a wide-angle lens is effectively improved, and the camera shooting effect is improved. According to the invention, the characteristics of large field angle, low distortion, high resolution, large target surface and low cost are taken into consideration simultaneously, so that the defects in the prior art are overcome.

Description

technical field [0001] The invention relates to the technical field of optical lens modules, in particular to an ultra-large target surface distortion-free lens. Background technique [0002] In recent years, camera systems used for monitoring purposes, UAV aerial photography, or identification purposes have developed towards large target areas, high resolution, and small distortion. Although the large target area lenses of current mainstream products can meet the high-definition requirements, but The size is very large, and the image distortion is serious, and the amount of information in the surrounding images is poor. Further image processing is required in the later stage, or a complex multi-lens combination is required to correct system distortion, which does not meet the miniaturization and lightweight requirements of the monitoring or identification field. [0003] For example, the application number is 201811387125.9, and the invention patent titled "1 / 1.8-inch large...

AI Technical Summary

Problems solved by technology

[0002] In recent years, camera systems used for monitoring purposes, UAV aerial photography, or identification purposes have developed towards large target areas, high resolution, and small distortion. Although the large target area lenses of current mainstream products can meet the high-definition requirements, but The volume is very large, and the image distortion is serious, and the amount of information in the surrounding images is poor. Further image processing is required in the later stage, or a complex multi-lens combination is required to correct system distortion, which does not meet the miniaturization and lightweight requirements of the monitoring or identification field.

[0003] For example, the application number is 201811387125.9, and the invention patent titled "1 / 1.8-inch large target surface 6mm focal length high-definition low-distortion industrial lens and working method" has a small target surface (only 1 / 1.8), which cannot be matched. Larger target surface, higher pixel requirements), large distortion (close to 2%), too many lenses, complex structure, large volume, and heavy weight, which cannot be applied to drones and other fields.

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