| 主权项 |
1. An optical imaging lens set, from an object side toward an image side in order along an optical axis comprising: a first lens element, a second lens element, a third lens element and a fourth lens element, said first lens element to said fourth lens element each having an object-side surface facing toward the object side as well as an image-side surface facing toward the image side, wherein:
said first lens element has an image-side surface with a convex portion in a vicinity of its periphery; said second lens element has an object-side surface with a concave portion in a vicinity of its periphery and an image-side surface with a convex portion in a vicinity of its periphery; said third lens element has an image-side surface with a convex portion in a vicinity of said optical axis and a concave portion in a vicinity of its periphery; and said fourth lens element is made of plastic and has an object-side surface with a concave portion in a vicinity of its periphery; said optical imaging lens set exclusively has said first lens element, said second lens element, said third lens element and said fourth lens element with refractive power, the effective focal length EFL of said optical imaging lens set, a thickness T1 of said first lens element along said optical axis, and a thickness T2 of said second lens element along said optical axis, a thickness T3 of said third lens element along said optical axis, and a thickness T4 of said fourth lens element along said optical axis satisfy a relationship 1.87(T3/T2)≦3.2, 2.81≦(EFL/T3)≦4.37, EFL≦2 mm and 0.25 mm≦T4. |
