| 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, an aperture stop, a second lens element, a third lens element and a fourth lens element, said first to fourth lens elements having an object-side surface facing toward the object side as well as an image-side surface facing toward the image side, wherein:
the first lens element has an image-side surface with a concave part in a vicinity of its periphery; the second lens element has an object-side surface with a convex part in a vicinity of the optical axis, and an image-side surface with a convex part in a vicinity of its periphery and a convex part in a vicinity of the optical axis; the third lens element with positive refractive power, has an object-side surface with a concave part in a vicinity of the optical axis, and an image-side surface with a convex part in a vicinity of the optical axis; the fourth lens element has an image-side surface with a concave part in a vicinity of the optical axis as well as a convex part in a vicinity of its periphery; the optical imaging lens set does not include any lens element with refractive power other than said first lens element, second lens element, third lens element and fourth lens element, in addition, the sum of all three air gaps Gaa between each lens elements from said first lens element to said fourth lens element along the optical axis, and a thickness T3 of said third lens element along said optical axis satisfy a relationship 1.25≦(T3/Gaa). |
