Iris recognition optical imaging lens group and imaging method thereof
An optical imaging and iris recognition technology, applied in the fields of optics, optical components, character and pattern recognition, etc., can solve the problems such as the total length of the optical system is not easy to be shortened, the degree of freedom of the optical system is reduced, and the number of components is not easy to decrease, etc. High-volume manufacturing, reduced sensitivity, and less TV distortion
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Embodiment 1
[0045] Example 1 Reference Figure 2 to Figure 5
[0046] In this embodiment, the optical imaging lens group is mainly composed of three lenses, which are in order from the object side to the image side: the first lens with positive refractive power, the surface on the object side is convex, the surface on the image side is concave, and its material It is plastic, and the front object-side surface and image-side surface of the first lens are both aspherical; the second lens with negative refractive power has a convex object-side surface and a concave image-side surface, and its material is plastic. Both the object-side surface and the image-side surface of the lens are aspherical; the third lens with negative refractive power has a convex object-side surface and a concave image-side surface, and its material is plastic. The object-side surface of the third lens, The image-side surfaces are all aspherical, and there is at least one inflection point on the image-side surface of...
Embodiment 2
[0063] Example 2 Reference Figure 6 to Figure 9
[0064] In this embodiment, the optical imaging lens group is mainly composed of three lenses, which are in order from the object side to the image side: the first lens with positive refractive power, the surface 11 on the object side is convex, and the surface 11 on the image side is concave. The material is plastic, and the object-side surface and the image-side surface of the first lens are both aspherical; the second lens with negative focal power has a convex object-side surface and a concave image-side surface, and its material is plastic. Both the object-side surface and the image-side surface of the lens are aspherical; the third lens with negative refractive power has a convex object-side surface and a concave image-side surface, and its material is plastic. The object-side surface of the third lens and The image side surfaces are all aspherical, and there is at least one inflection point on the image side surface of ...
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