| 摘要 |
A lens assembly (1) includes a first lens (L11), a second lens (L12), a third lens (L 13), a fourth lens (L 14) and a fifth lens (L15), all of which are arranged in sequence from an object side to an image side along an optical axis (OA1). The first lens (L11) is with refractive power and includes a convex surface facing the object side. The second and third lenses (L12, L13) are with refractive power. The fourth lens (L 14) is with refractive power and includes a convex surface facing the image side. The fifth lens (L15) is with negative refractive power. The lens assembly (1) satisfies: 0 ‰¤ f 1 /f 2 ‰¤ 6, (Vd 1 + Vd 2 )/2 > 40, Vd 1 ‰¥ Vd 3 , Vd 2 ‰¥ Vd 3 , Vd 5 ‰¥ Vd 3 wherein f 1 is an effective focal length of the first lens (L11), f 2 is an effective focal length of the second lens (L12) and Vd 1 , Vd 2 , Vd 3 , Vd 5 are Abbe numbers of the first, second, third, fifth lenses (L11, L12, L13, L15). |
