Imaging lens
AssigneeAAC Technologies Pte. Ltd.
InventorHiroyuki Teraoka
Life of this patent
Estimating the term…
Abstract
An image lens is disclosed. The image lens includes, arranged in succession from the object side to the image side, an aperture stop S1, a first lens L1 having two convex surfaces and having a positive refractive power, a second lens L2 having a meniscus shape convex toward the object side and having a negative refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a meniscus shape convex toward the image side and having a positive refractive power, and a fifth lens L5 having a meniscus shape convex toward the object side and having a negative refractive power.
Claims4
An image lens comprising, arranged in succession from the object side to the image side:
- an aperture stop S1;
- a first lens L1 having two convex surfaces and having a positive refractive power;
- a second lens L2 having a meniscus shape convex toward the object side and having a negative refractive power;
- a third lens L3 having a meniscus shape convex toward the object side and having a positive refractive power;
- a fourth lens L4 having a meniscus shape convex toward the image side and having a positive refractive power;
- a fifth lens L5 having a meniscus shape convex toward the object side and having a negative refractive power;
- wherein the following conditions (1)˜(4) are satisfied:
- 0.600≦f1/f≦0.900 (1)
- −1.400≦f2/f≦−1.150 (2)
- −0.085≦R1/R2≦−0.055 (3)
- 3.000≦R3/R4≦6.000 (4)
- where,
- f is the focal length of the image lens LA;
- f1 is the focal length of the first lens L1;
- f2 is the focal length of the second lens L2;
- R1 is the curvature radius of the object side surface of the first lens L1;
- R2 is the curvature radius of the image side surface of the first lens L1;
- R3 is the curvature radius of the object side surface of the second lens L2;
- R4 is the curvature radius of the image side surface of the second lens L2.
Dependencies are inferred from the claim text.