| 摘要 |
An optical imaging lens includes: an aperture stop, a first, second, third and fourth lens element arranged in order from an object side to an image side along an optical axis of the imaging lens. The image-side surface of the first lens element has a convex part in a vicinity of its periphery, the object-side surface of the second lens element has a concave portion in a vicinity of the optical axis, the object-side of the third lens element has a concave portion in a vicinity of the optical axis, and a convex part in a vicinity of its periphery; the object-side surface of the fourth lens element has a convex portion in a vicinity of the optical axis. The imaging lens satisfies T3/AAG≧1.4, (G12+G34)/T2≦1.4 and |V1−V4|≦20. |
| 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 and a fourth 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:
said image-side surface of said first lens element has a convex part in a vicinity of its periphery; said object-side surface of said second lens element has a concave portion in a vicinity of the optical axis; said object-side of said third lens element has a concave portion in a vicinity of the optical axis, and a convex part in a vicinity of its periphery; said object-side surface of said fourth lens element has a convex portion in a vicinity of the optical axis; and the optical imaging lens set does not include any lens element with refractive power other than said first, second, third and fourth lens elements; a thickness T2 of said second lens element along said optical axis, a thickness T3 of said third lens element along said optical axis, an air gap AG12 between said first lens element and said second lens element along said optical axis, an air gap AG34 between said third lens element and said fourth lens element along said optical axis, the sum of all three air gaps AAG between each lens element from said first lens element to said fourth lens element along the optical axis, the Abbe number V1 of the first lens element, and the Abbe number V4 of the fourth lens element satisfy the relationships: T3/AAG≧1.4, (G12+G34)/T2≦1.4, and |V1−V4|≦20. |
