Super wide-angle lens

Abstract

The invention discloses a super wide-angle lens, which, from an object side to an image side, successively comprises a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power, fifth lens having negative refractive power and a sixth lens having positive refractive power, wherein the object side of the second lens is a convex surface and the image side of the second lens is a concave surface, the object side of the third lens is a convex surface, and the image side of the sixth lens which is close to the axis is a concave surface. The super wide-angle lens satisfies the following relation: the absolute value of tan (HFOV)/TTL>0.9; and -2.0& absolute value of t;f1/f<0, wherein the HFOV is half of the biggest vision field angle of the super wide-angle lens, TTL is the overall length of the super wide-angle lens, f1 is the effective focal length of the first lens, and the f is the effective focal length of the super wide-angle lens. The super wide-angle lens can improve the vision field angle while guaranteeing the miniaturization, realizes the characteristics of the wide angle, corrects various image differences and improves the image quality.

Description

technical field [0001] The invention relates to an imaging technology, in particular to a super wide-angle lens. Background technique [0002] With the development of semiconductor technology, the size of CCD or CMOS image sensor is getting smaller and smaller, while the pixels are getting higher and higher. Correspondingly, the imaging lens is also required to develop towards miniaturization and high resolution. However, in some occasions, the imaging lens also needs to have wide-angle characteristics, and the current wide-angle characteristics generally require an increase in the number of lenses, which is not conducive to miniaturization, and will deteriorate the aberration control effect, resulting in poor imaging quality. Contents of the invention [0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention needs to provide an ultra-wide-angle lens. [0004] The ultra-wide-angl...

AI Technical Summary

Problems solved by technology

However, in some occasions, the imaging lens is also required to have wide-angle characteristics, and the current wide-angle characteristics generally require an

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