CPC G02B 13/008 (2013.01) [B60R 11/04 (2013.01); G02B 5/005 (2013.01); G02B 9/60 (2013.01); G02B 13/005 (2013.01); G02B 13/02 (2013.01); B60R 2011/0033 (2013.01); B60R 2300/106 (2013.01)] | 12 Claims |
1. An optical imaging system comprising:
a first lens having a positive refractive power;
a second lens having a positive refractive power and a concave image-side surface in a paraxial region thereof;
a third lens having a negative refractive power and a concave object-side surface in a paraxial region thereof;
a fourth lens having a positive refractive power; and
a fifth lens having a refractive power,
wherein the first to fifth lenses are sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system,
the optical imaging system has a total number of five lenses having a refractive power,
TL/2Y<2.0 is satisfied, where TL is a distance along the optical axis from an object-side surface of the first lens to the imaging plane, and 2Y is a diagonal length of the imaging plane, and
a radius of curvature of an object-side surface of the fourth lens is greater than a radius of curvature of the object-side surface of the first lens.
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