Optical lens

Abstract

The invention discloses an optical lens, comprising a first lens, a second lens and a third lens arranged coaxially. The surface of the first lens is a spherical surface; the surfaces of the second and the third lenses are non-spherical surfaces. The surfaces of the second and the third lenses meet the function (refer to the Figure): the optical lens satisfies the following relationship: 1.25<f / L<1.4, 0.5<f1 / f<0.8, f2<0 and 0.65<|f2 / f|<1, 1.3<f3 / f<1.6, in which f is the effective focus of the optical lens, f1 is the effective focus of the first lens, f2 is the effective focus of the second lens, f3 is the effective focus of the third lens and L is the total length of the optical lens with an air compensated distance. The optical lens of the invention has the advantages of good imaging quality, short total length, high illumination, large angle of field coverage, small emergence angle, minimum relative illumination over 50%, smart volume, light weight and nice optical performance.

Description

technical field [0001] The invention relates to optical devices, in particular to an optical lens. Background technique [0002] Optical lens is an important component of digital imaging equipment, and the imaging quality of the lens directly determines the imaging performance of digital imaging equipment. In recent years, digital products have been continuously updated, and they are increasingly developing in the direction of thinner, lighter and smaller. Therefore, there are higher and higher requirements for optical lenses equipped in digital imaging equipment, as follows: [0003] 1. Excellent imaging quality. The resolution of the lens suitable for megapixels should reach 1601p / mmMTF≥0.3: [0004] 2 Small and light. That is to say, the total length is required, the number of lenses is small, and the back focus is appropriate; [0005] 3. High brightness. That is, the F / # number is small, the maximum exit angle is ≤20°, and the relative illuminance is ≥50%; [000...

AI Technical Summary

Problems solved by technology

It is far from meeting the requirements of today's digital products, which are light, thin and short

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