CPC G02B 9/64 (2013.01) [G02B 13/0045 (2013.01); G02B 27/0025 (2013.01); G02B 3/04 (2013.01); G02B 5/005 (2013.01); G02B 13/18 (2013.01)] | 13 Claims |
1. An optical imaging system, comprising:
a first lens comprising a positive refractive power and a concave image-side surface;
a second lens comprising a convex object-side surface;
a third lens comprising a refractive power;
a fourth lens comprising a refractive power;
a fifth lens comprising a refractive power;
a sixth lens comprising a convex object-side surface and a concave image-side surface; and
a seventh lens comprising a negative refractive power,
wherein the first to seventh lenses are sequentially disposed from an object side toward an imaging plane,
wherein an absolute value of a radius of curvature of an image-side surface of the fourth lens is greater than an absolute value of a radius of curvature of the object-side surface of the sixth lens, and
wherein 3.0<|f4/f|, where f is an overall focal length of the optical imaging system and f4 is a focal length of the fourth lens.
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