CPC G02B 13/0045 (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, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof;
a third lens having a negative refractive power, a concave object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof;
a fourth lens having a positive refractive power; and
a fifth lens having a negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof,
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, and
TTL/(2Y)<2.0 is satisfied, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging plane, and Y is one half of a diagonal length of the imaging plane.
|