CPC G02B 9/62 (2013.01) [G02B 13/0045 (2013.01)] | 16 Claims |
1. An optical imaging lens group with six lenses, sequentially comprising, from an object side to an image side along an optical axis:
a diaphragm;
a first lens with a positive refractive power, an object-side surface thereof being a convex surface;
a second lens with a positive refractive power;
a third lens with a negative refractive power, an image-side surface thereof being a concave surface;
a fourth lens with a positive refractive power, an object-side surface thereof being a convex surface, while an image-side surface thereof being a concave surface;
a fifth lens with a positive refractive power, an object-side surface thereof being a concave surface, while an image-side surface thereof being a convex surface; and
a sixth lens with a negative refractive power, an object-side surface thereof being a convex surface, while an image-side surface thereof being a concave surface,
wherein ω is a half of a field of view of the optical imaging lens group, and f5 is an effective focal length of the fifth lens, f5 and ω meet: 0.50 mm<f5×(tan ω)2<1.00 mm;
R9 is a curvature radius of an object-side surface of the fifth lens, and R10 is a curvature radius of an image-side surface of the fifth lens, R9 and R10 meet: 3.00<(R9+R10)/(R9−R10)<5.00;
f is a total effective focal length of the optical imaging lens group, f1 is an effective focal length of the first lens, and f2 is an effective focal length of the second lens, f, f1 and f2 meet: 1.50<(f1+f2)/f<4.00.
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