CPC G02B 13/0045 (2013.01) [G02B 9/00 (2013.01); G02B 9/62 (2013.01); G02B 13/00 (2013.01); G02B 13/002 (2013.01); G02B 27/0025 (2013.01)] | 8 Claims |
1. An optical imaging system comprising:
a first lens comprising positive refractive power, a convex object-side surface and a concave image-side surface;
a second lens comprising negative refractive power, a convex object-side surface and a concave image-side surface;
a third lens comprising positive refractive power;
a fourth lens comprising negative refractive power;
a fifth lens comprising refractive power; and
a sixth lens comprising negative refractive power,
wherein the first to sixth lenses are sequentially arranged from an object side to an image side,
wherein the first to sixth lenses are formed of plastic material,
wherein the optical imaging system has a total of six lenses,
wherein f/(CT3+CT4+CT5)<4.0 is satisfied, where f is an overall focal length of the optical imaging system, CT3 is a thickness of the third lens in a paraxial region, CT4 is a thickness of the fourth lens in the paraxial region, and CT5 is a thickness of the fifth lens in the paraxial region, and
wherein the second lens has the greatest refractive index among the first to sixth lenses and the second lens has a refractive index greater than 1.66.
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