| CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01); G02B 13/02 (2013.01)] | 28 Claims |
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1. An optical imaging system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, and each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein a total number of lens elements in the optical imaging system is seven, the image-side surface of the sixth lens element is concave in a paraxial region thereof, the seventh lens element has negative refractive power, the object-side surface of the seventh lens element is concave in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of at least one lens element of the optical imaging system has at least one inflection point in an off-axis region thereof;
wherein a maximum image height of the optical imaging system is ImgH, an axial distance between the image-side surface of the seventh lens element and an image surface is BL, a focal length of the optical imaging system is f, a curvature radius of the object-side surface of the seventh lens element is R13, a curvature radius of the image-side surface of the seventh lens element is R14, an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, and the following conditions are satisfied:
7.50<ImgH/BL;
−5.0<f/R13+f/R14<−2.8; and
9.5<TD/BL.
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