| 主权项 |
1. An optical imaging lens set comprising:
a first lens element having an image-side surface facing toward an image side and an object-side surface facing toward an object side; a second lens element having an image-side surface facing toward the image side and an object-side surface facing toward the object side; a third lens element having an image-side surface facing toward the image side and an object-side surface facing toward the object side; a fourth lens element having an image-side surface facing toward the image side and an object-side surface facing toward the object side; and a fifth lens element having an image-side surface facing toward the image side and an object-side surface facing toward the object side, wherein the first, second, third, fourth, and fifth lens elements are disposed from the object side toward the image side in order along an optical axis and each lens element has a refractive power, wherein: the image-side surface of the first lens element has a concave portion in a vicinity of the optical axis; the image-side surface of the second lens element has a convex portion in a vicinity of the optical axis; the image-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis; and the image-side surface of the fifth lens element has a concave portion in a vicinity of the optical axis; wherein a total thickness of the first, second, third, fourth, and fifth lens elements along the optical axis is equal to Ta1, a thickness of the second lens element along the optical axis is equal to T2, and Ta1 and T2 satisfy a relationship Ta1/T2≦4.82. |
