CPC G02B 9/62 (2013.01) [G02B 13/0045 (2013.01); G02B 13/0065 (2013.01)] | 20 Claims |
1. A lens assembly comprising:
a first lens which is with positive refractive power and comprises a concave surface facing an object side and a convex surface facing an image side;
a second lens which is with negative refractive power and comprises a concave surface facing the object side;
a third lens which is with positive refractive power; and
a fourth lens which is with refractive power and comprises a concave surface facing the image side;
wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side to the image side along an optical axis;
wherein the lens assembly satisfies at least any one of the following conditions:
5 mm<ALOD<14 mm;
0<TTL/ALOD<2;
0.2 mm2<L1T×L1SD<2.2 mm2;
−4 mm2<L1T×R11<0 mm2;
wherein TTL is a total length of optical system of the lens assembly, ALOD is a total effective optical diameter of an object side surface of each lens of the lens assembly, L1T is a thickness along the optical axis of the first lens, L1SD is an effective optical semi-diameter of an image side surface of the first lens, and R11 is a radius of curvature of an object side surface of the first lens.
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