| 摘要 |
An optical imaging lens set includes a first lens with positive refractive power and a convex object-side surface, a second lens element with negative refractive power and an image-side surface with a concave portion in a vicinity of its periphery, a third lens element has an object-side surface with a concave portion in a vicinity of its periphery, a fourth lens element with positive refractive power, a concave object-side surface and a convex image-side surface, a fifth lens element with an object-side with a convex portion in a vicinity of the optical axis, an image-side surface with a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of its periphery. |
| 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, all of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element having refractive power, said first to fifth 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 with positive refractive power, has an object-side surface, and the object-side surface is a convex surface; the second lens element with negative refractive power, 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 with positive refractive power, has an object-side surface and an image-side surface, the object-side surface is a concave surface and the image-side surface is a convex surface; the fifth lens has an object-side surface with a convex part in a vicinity of the optical axis, and 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, fourth lens element and fifth lens element, in addition, an air gap G12 along the optical axis is disposed between the first lens element and the second lens element, an air gap G23 along the optical axis is disposed between the second lens element and the third lens element, an air gap G34 along the optical axis is disposed between the third lens element and the fourth lens element, an air gap G45 along the optical axis is disposed between the fourth lens element and the fifth lens element, the sum of total four air gaps between adjacent lens elements from the first lens element to the fifth lens element along the optical axis is Gaa, the first lens element has a first lens element thickness T1 along the optical axis, the second lens element has a second lens element thickness T2 along the optical axis, the third lens element has a third lens element thickness T3 along the optical axis, the fourth lens element has a fourth lens element thickness T4 along the optical axis, the fifth lens element has a fifth lens element thickness T5 along the optical axis, and the total thickness of all the lens elements in the optical imaging lens set along the optical axis is Tall, the distance between the image-side surface of the fifth lens element to an image plane along the optical axis is BFL, and satisfy the relationships 1.8≦(G34+G45)/G23 and (Tall+Gaa)/BFL ≦2.6. |
