Small optical imaging lens with high light flux

Abstract

The invention relates to the technical field of lenses, and discloses a small optical imaging lens with high light flux. The small optical imaging lens with high light flux sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, wherein the first lens, the second lens and the sixth lens are all convex-concave lenses with a negative refractive index; the third lens has a positive refractive index, and the object side face of the third lens is a convex face; the fourth lens is a concave-convex lens with a positive refractive index; the fifth lens is a convex lens with a positive refractive index; and the object side face and the image side face of the third lens are aspheric faces or the object side face and the image side face of the fourth lens are aspheric faces. The small optical imaging lens of the invention has the advantages of high resolution, small distortion, goodimaging quality, large relative aperture, uniform relative illuminance and miniaturization.

Description

technical field [0001] The invention belongs to the field of lens technology, and in particular relates to a small optical imaging lens with large-scale light. Background technique [0002] With the continuous advancement of science and technology and the continuous development of society, optical imaging lenses have also developed rapidly in recent years. Optical imaging lenses are widely used in smart phones, tablet computers, video conferencing, vehicle monitoring, security monitoring, 3D scanning Therefore, the requirements for optical imaging lenses are also increasing. [0003] In a system using TOF (time of flight) technology for 3D scanning, the performance of the TOF lens is critical, which will greatly affect the effect and reliability of 3D scanning. However, TOF lenses currently on the market still have many deficiencies, such as the relatively small aperture, which does not meet the ideal relative aperture required for the application; the overall size is large...

AI Technical Summary

Problems solved by technology

[0003] In a system using TOF (time of flight) technology for 3D scanning, the performance of the TOF lens is critical, which will greatly affect the effect and reliability of 3D scanning

However, TOF lenses currently on the market still have many deficiencies, such as the relatively small aperture, which does not meet the ideal relative aperture required for the application; the overall size is large and the total length is long, which cannot meet the needs of miniaturization; the control of distortion is poor, and the distortion caused by correction A large number of pixels are lost; in order to achieve a large relative aperture, the relative illumination of the edge field of view is sacrificed; the transfer function is not well controlled, the resolution is low, and the imaging quality is poor, etc., which can no longer meet the increasing requirements of the 3D scanning field, and urgently need to be improved.

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