CPC G02B 9/62 (2013.01) [G02B 7/021 (2013.01); G02B 13/0045 (2013.01); G02B 27/0037 (2013.01)] | 16 Claims |
1. An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged on an optical axis from an object side to an image side,
wherein an image-side surface of the first lens and an image-side surface of the sixth lens are concave,
wherein a radius of curvature of an object-side surface of the fourth lens is greater than a radius of curvature of an image-side surface of the first lens, and
0.7<TL/f<1.0 and |Nd2−Nd3|<0.2 in which TL is a distance from an object-side surface of the first lens to an imaging plane, f is an overall focal length of the optical imaging system, Nd2 is a refractive index of the second lens, and Nd3 is a refractive index of the third lens.
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