| 主权项 |
1. An optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising an aperture stop, and first, second, third, fourth, fifth and sixth lens elements, each of said first, second, third, fourth, fifth and sixth lens elements having refracting index, an object-side surface facing toward the object side and an image-side surface facing toward the image side and a central thickness defined along the optical axis, wherein:
said object-side surface of said first lens element comprises a convex portion in a vicinity of the optical axis; said image-side surface of said second lens element comprises a concave portion in a vicinity of the optical axis; said image-side surface of said third lens element comprises a convex portion in a vicinity of a periphery of the third lens element; said object-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis, and said image-side surface thereof comprises a convex portion in a vicinity of the optical axis; said fifth lens element is constructed by plastic material; said object-side surface of said sixth lens element comprises a convex portion in a vicinity of the optical axis; the optical imaging lens comprises no other lenses having refracting index beyond the six lens elements; and the central thickness of the first lens element is represented by T1, an effective focal length of the optical imaging lens is represented by EFL, and T1 and EFL satisfy the inequality:
EFL/T1≦7.5, andan air gap between the first lens element and the second lens element along the optical axis is represented by G12, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis is represented by AAG, and G12, G34 and AAG satisfy the inequality:
AAG/(G12+G34)≦4.1. |
