Imaging lens, iris imaging module and iris identification device

Abstract

The invention discloses an imaging lens, an iris imaging module and an iris identification device, and belongs to the field of biological identification. From front to back of a light incidence direction, the imaging lens sequentially comprises: a first lens, wherein the first lens is a double-convex lens with positive power, the front surface is a convex surface, and the back surface is a convex surface; a second lens, wherein the second lens is a double-concave lens with negative power, the front surface is a concave surface, and the back surface is a concave surface; a third lens, wherein the third is a convex-concave lens with positive power, the front surface is a convex surface, and the back surface is a concave surface; a fourth lens, wherein the fourth lens is a double-convex lens with positive power, the front surface is a convex surface, and the back surface is a convex surface; and a fifth lens, wherein the fifth lens is a convex-concave lens with negative power, the front surface is a convex surface, and the back surface is a concave surface. The third lens and the fourth lens are glued together. The imaging lens provided by the invention is good in imaging quality, wide in collection range, convenient to use and simple in structure.

Description

technical field [0001] The invention relates to the field of biological identification, in particular to an imaging lens, an iris imaging module and an iris identification device. Background technique [0002] Iris recognition is a biometric technology that authenticates user identity based on processing the iris texture information of the eye in an area smaller than 10mm. The difficulty in realizing this technology lies in how to collect clear and high-quality iris images, that is, high-quality iris image acquisition optical systems . At present, the existing iris collection optical system can be divided into: zoom optical system and fixed focus optical system, among which the zoom optical system is large in size, complex in structure, high in cost and difficult to assemble; the fixed focus optical system is simple in structure, low in cost and convenient to install At present, the products on the market generally use fixed-focus optical systems, but most of the existing f...

AI Technical Summary

Problems solved by technology

At present, the existing iris collection optical system can be divided into: zoom optical system and fixed focus optical system, among which the zoom optical system is large in size, complex in structure, high in cost and difficult to assemble; the fixed focus optical system is simple in structure, low in cost and convenient to install At present, the products on the market generally use fixed-focus optical systems, but most of the existing fixed-focus optical systems are monocular acquisition optical systems, which are generally equipped with image sensors with lower pixels (VGA is enough)

[0003] However, the collection of one eye requires a high degree of cooperation from the user, and the collection range of the equipment is very narrow, which is extremely inconvenient to use and is not conducive to grasping the distance and alignment

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