Hybrid diffractive-refractive wide-angle lens

Abstract

The invention relates to a hybrid diffractive-refractive wide-angle lens. The hybrid diffractive-refractive wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens sequentially from an object space to an image space, the first lens is a negative meniscus lens with two even-order aspheric sides, the second lens is a biconcave lens with two even-order aspheric sides, the third lens is provided with a spherical front surface and a binary diffractive rear surface, the fourth lens is a biconvex spherical lens, the fifth lens is a biconcave spherical lens, the sixth lens is a biconvex spherical lens, and the seventh lens is a negative meniscus spherical lens. The hybrid diffractive-refractive wide-angle lens adopting a hybrid manner of diffraction and refraction is small in size and light, total optical length is smaller than 18mm, achieves imaging effects of large visual field, low distortion and low chromatic aberration and obtains high imaging quality.

Description

technical field [0001] The invention relates to an optical lens, in particular to a refraction-diffraction hybrid wide-angle lens. Background technique [0002] With the improvement of market requirements for mobile phone imaging quality, the design requirements for various optical parameters of mobile phone lenses are constantly being updated, and the design method of mobile phone camera lenses is becoming more and more important. [0003] At present, mobile phone lenses on the market mostly adopt a refractive structure, with many lenses, large size, complex structure, heavy weight, and the control of chromatic aberration and thermal characteristics is not very good. Contents of the invention [0004] The object of the present invention is to provide a refraction-diffraction hybrid wide-angle lens with small size, few lenses, low chromatic aberration and high imaging quality. [0005] For achieving the purpose of the present invention, the technical scheme provided by th...

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Problems solved by technology

[0003] At present, most of the mobile phone lenses on the market adopt a refractive structure, with many lenses, large size, complex structure, heavy weight, and the control of chromatic aberration and thermal characteristics is not very good.

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