| 主权项 |
1. An optical imaging lens set, from an object side toward an image side in order along an optical axis comprising: an aperture stop, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element, each lens element having refractive power, and 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 positive refracting power; the second lens element has an image-side surface with a concave part in a vicinity of its periphery; the third lens element has an object-side surface with a concave part in a vicinity of its periphery; the fourth lens has positive refracting power, having an object-side surface with a concave part in a vicinity of the optical axis and a concave part in a vicinity of its periphery, and further has an image-side surface with a convex part in a vicinity of its periphery; the fifth lens element has negative refracting power, having an object-side surface with a convex part in a vicinity of the optical axis, and further has image-side surface with a concave part in a vicinity of the optical axis and a convex part in a vicinity of its periphery; and the optical imaging lens set does not include any lens element with refractive power other than said first, second, third, fourth and fifth lens elements; an air gap AG34 between said third lens element and said fourth lens element along said optical axis, an air gap AG45 between said fourth lens element and said fifth lens element along said optical axis, the effective focal length EFL of the optical imaging lens set, the Abbe number V1 of the first lens element, and the Abbe number V3 of the third lens element satisfy the relationships: |V1−V3|≧20 and EFL/(G34+G45)≦4.8. |
