Patent ID: 9671589
Date: 2017-06-06
CPC Classifications: G02B

Claim:
1. An optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising an aperture stop, first, second, third, fourth, fifth and sixth lens elements, each of said first, second, third, fourth, fifth and sixth lens elements having refracting power, 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 image-side surface of said first lens element comprises a convex portion in a vicinity of the optical axis; said object-side surface of said second lens element comprises a concave portion in a vicinity of a periphery of the second lens element; said object-side surface of said third lens element comprises a convex portion in a vicinity of a periphery of the third lens element; said fourth lens element is constructed by plastic material; said image-side surface of said fifth lens element comprises a concave portion in a vicinity of the optical axis; said image-side surface of said sixth lens element comprises a concave portion in a vicinity of the optical axis; an effective focal length of the optical imaging lens is represented by EFL, a central thickness of the second lens element is represented by T2, a central thickness of the sixth lens element is represented by T6, EFL, T2 and T6 satisfy the equation: EFL/(T2+T6)≦5.9; and 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, AAG and EFL satisfy the equation: EFL/AAG≧4.0; the optical imaging lens comprises no other lenses having refracting power beyond the six lens elements.