CPC G02B 13/0045 (2013.01) [G02B 3/04 (2013.01); G02B 9/64 (2013.01); G02B 13/18 (2013.01); G02B 27/0025 (2013.01)] | 19 Claims |
1. A photographing optical lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side, 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; 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 the first lens element has positive refractive power, the image-side surface of the sixth lens element is concave in a paraxial region thereof, the object-side surface of the seventh lens element is concave in a paraxial region thereof, and at least one of object-side and image-side surfaces of the seven lens elements is aspheric and has at least one inflection point;
wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the photographing optical lens system is ImgH, a number of lens elements having an Abbe number smaller than 20 among the seven lens elements is V20, a focal length of the photographing optical lens system is f, a focal length of the fourth lens element is f4, and the following conditions are satisfied:
TL/ImgH<1.75;
2≤V20; and
−10.0<f4/f≤0.
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