Imaging lens, iris imaging module and binocular iris recognition device

Abstract

The invention discloses an imaging lens, an iris imaging module and a binocular iris recognition device. The imaging lens, an iris imaging module and a binocular iris recognition device belong to the field of biological recognition. The imaging lens successively comprises the following components in an optical axis direction from front to back: a first lens which is a convexoconcave lens with a positive focal power, wherein the front surface of the first lens is a convex surface and the back surface of the first lens is a recessed surface; a second lens which is convexoconcave lens with a negative focal power, wherein the front surface of the second lens is a recessed surface and the back surface of the second lens is a convex surface; a third lens which is a biconvex lens with a positive focal power, wherein the front surface and the back surface of the third lens are convex surfaces; and a fourth lens which is a biconcave lens with a negative focal power, wherein the front surface and the back surface of the fourth lens are recessed surfaces. The front surface and/or the back surface of each of the first lens, the second lens, the third lens and the fourth lens are aspheric. The imaging lens has advantages of simple structure, small size, high imaging quality and small distortion. The imaging lens is suitable for binocular iris acquisition.

Description

technical field [0001] The invention relates to the field of biological identification, in particular to an imaging lens, an iris imaging module and a binocular iris identification device. Background technique [0002] With the advent of the Internet information age, people's requirements for the security and stability of information, especially personal information, have been continuously improved, and the application of identity authentication by using people's inherent unique physiological or behavioral characteristics has become more and more extensive. Among them, iris recognition technology As the "most accurate" and "hardest to counterfeit" biometric technology is increasingly favored by everyone. However, iris recognition is a biometric technology based on the texture characteristics of the iris of the eye. Since the surface of the iris is spherical, the area is small, and the color is dark, the imaging quality of the optical system for collecting iris images is high...

AI Technical Summary

Problems solved by technology

[0003] At present, the optical imaging system of large-scale iris recognition devices generally adopts a zoom system, which is composed of more than a dozen lenses, and is equipped with complex motors and other mechanical structures to adjust the focus. The disadvantage is that it is large in size, complex in operation and high in cost, and can only be used in special occasions and fields; for the application of the general public, more convenient and miniaturized iris recognition equipment is needed, and its iris imaging optical system is usually a simple structure fixed Focusing system, the existing monocular acquisition optical system is mostly used, which is generally equipped with a lower pixel image sensor (VGA), its optical structure is simple, only 2-3 lenses are needed to achieve high imaging quality, but One eye requires a high degree of cooperation from the user, and the equipment can collect a very narrow range, which is extremely inconvenient to use and is not conducive to grasping the distance and alignment

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