Photographing lens assembly, image capturing device and mobile terminal
A photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element, which has a total of six non-cemented lens elements with refractive power. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element with refractive power has an object-side surface being concave in a paraxial region thereof. The third and the fourth lens elements have refractive power. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region thereof.
1. A photographing lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element;
a third lens element;
a fourth lens element;
a fifth lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof; and
a sixth lens element having an object-side surface being convex in a paraxial region thereof and a image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one convex shape in an off-axis region thereof, and the object-side surface and the image-side surface of the sixth lens element are aspheric;
wherein the photographing lens assembly has a total of six non-cemented lens elements, a focal length of the photographing lens assembly is f, a focal length of the first lens element is f1, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of an image-side surface of the second lens element is R4, and the following conditions are satisfied:
0< f 1/ f< 2.5;
( R 3+ R 4)/( R 3− R 4)<−0.40; and
−2.0< f/R 4≦0.0.
2. The photographing lens assembly of claim 1 , wherein the fourth lens element has an image-side surface being convex in a paraxial region thereof.
3. The photographing lens assembly of claim 1 , wherein the second lens element has negative refractive power.
4. The photographing lens assembly of claim 1 , wherein the focal length of the photographing lens assembly is f, the focal length of the first lens element is f1, and the following condition is satisfied:
0.30< f 1/ f< 1.25.
5. The photographing lens assembly of claim 1 , wherein an Abbe number of the fifth lens element is V5, and the following condition is satisfied:
V 5<32.
6. The photographing lens assembly of claim 1 , wherein the fourth lens element has an object-side surface being concave in a paraxial region thereof.
7. The photographing lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, and the following condition is satisfied:
0<( R 9+ R 10)/( R 9− R 10)<1.0.
8. The photographing lens assembly of claim 1 , wherein the fourth lens element has positive refractive power, and the positive refractive power of the fourth lens element becomes weak from a paraxial region towards a peripheral region.
9. The photographing lens assembly of claim 1 , wherein the focal length of the first lens element is f1, a focal length of the second lens element is f2, and the following condition is satisfied:
f 1/| f 2|<0.75.
10. The photographing lens assembly of claim 1 , wherein each of the second lens element, the third lens element and the fourth lens element has at least one inflection point on at least one of the object-side surface and the image-side surface thereof.
11. The photographing lens assembly of claim 1 , wherein both of the object-side surface and the image-side surface of the fifth lens element are aspheric and the image-side surface of the fifth lens element has at least one convex shape in an off-axis region thereof.
12. The photographing lens assembly of claim 1 , wherein an axial distance between the object-side surface of the first lens element and an image plane is TL, a maximum image height of the photographing lens assembly is ImgH, and the following condition is satisfied:
TL/ImgH< 2.0.
13. The photographing lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, and the following condition is satisfied:
−1.5<( R 1+ R 2)/( R 1− R 2)<−0.4.
14. The photographing lens assembly of claim 1 , wherein the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, and the following condition is satisfied:
−2.0<( R 3+ R 4)/( R 3− R 4)<−0.60.
15. The photographing lens assembly of claim 1 , wherein a sum of the central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is ΣCT, an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, and the following condition is satisfied:
0.65<Σ CT/Td< 0.85.
16. An image capturing device, comprising:
the photographing lens assembly of claim 1 ; and
an image sensor, wherein the image sensor is located on an image plane of the photographing lens assembly.
17. A mobile terminal, comprising:
the image capturing device of claim 16 .
18. The photographing lens assembly of claim 1 , wherein the second lens element has an object-side surface being concave in a paraxial region thereof.