CPC G02B 13/0045 (2013.01) [G02B 5/005 (2013.01); G02B 5/208 (2013.01); G02B 9/60 (2013.01); G02B 27/0025 (2013.01)] | 13 Claims |
1. An optical imaging system comprising:
a first lens having positive refractive power, a convex object-side surface, and a concave image-side surface;
a second lens having negative refractive power, a concave object-side surface at a paraxial region, and a concave image-side surface;
a third lens having positive refractive power and a concave object-side surface;
a fourth lens having positive refractive power and a concave object-side surface; and
a fifth lens having negative refractive power, a concave object-side surface, and a concave image-side surface,
wherein the first to fifth lenses are sequentially disposed in ascending numerical order from an object side of the optical imaging system toward an imaging plane,
wherein a thickness along an optical axis of the first lens is greater than a thickness along an optical axis of the fourth lens,
wherein a radius of curvature of the image-side surface of the fifth lens is greater than a radius of curvature of the image-side surface of the second lens, and
wherein a distance from the image-side surface of the second lens to the object-side surface of the third lens is greater than a distance from an image-side surface of the fourth lens to the object-side surface of the fifth lens.
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