Imaging lens, iris imaging module and iris recognition device
An imaging lens and lens technology, which is applied in the field of biometrics, can solve the problems of large volume of zoom optical system, unfavorable grasp of distance and alignment, narrow collection range, etc., and achieve high imaging quality, simple structure, and wide collection range.
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Embodiment 1
[0043] This embodiment is an imaging lens for binocular iris recognition, such as figure 2As shown, it is composed of five lens groups and a diaphragm 6'. An image sensor 8' is arranged behind the imaging lens. Along the incident direction of light, there are: a first lens 1' with positive refractive power, which is a biconvex lens. The front surface 11' is convex and the back surface 12' is convex; the second lens 2' having positive power is a convex-concave lens with a front surface 21' being convex and a back surface 22' being concave; having negative power The third lens 3' is a convex-concave lens, its front surface 31' is a convex surface, and its rear surface 32' is a concave surface; the fourth lens 4' and the fifth lens 5' are cemented lenses, and the fourth lens 4' has a positive light A convex-concave lens with a focal power, the front surface 41' is convex, and the back surface 42' is concave; the fifth lens 5' is a biconvex lens with positive power, the front sur...
Embodiment 2
[0050] This embodiment is an imaging lens for binocular iris recognition, such as Figure 4 As shown, it is composed of five lens groups, a diaphragm 6" and a flat filter 7". The rear of the imaging lens is provided with an image sensor 8". , which is a biconvex lens, its front surface 11 "is a convex surface, and its back surface 12" is a convex surface; the second lens 2 "with positive refractive power is a convex-concave lens, its front surface 21 "is a convex surface, and its back surface 22 "is Concave surface; the third lens 3 " with negative power, which is a convex-concave lens, its front surface 31 " is a convex surface, and the rear surface 32 " is a concave surface; the fourth lens 4 " and the fifth lens 5 " are cemented lenses, the first The four lens 4 "is a convex-concave lens with positive refractive power, its front surface 41 "is a convex surface, and its rear surface 42 "is a concave surface; the fifth lens 5 "is a biconvex lens with positive refractive power...
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