Photographing optical lens assembly, image capturing device and electronic device
A photographing optical 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, a sixth lens element and a seventh lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The sixth lens element has at least one of an object-side surface and an image-side surface being aspheric, wherein at least one of the object-side surface and the image-side surface of the sixth lens element comprises at least one inflection point. The seventh lens element has an object-side surface and an image-side surface being both aspheric.
1. A photographing optical lens assembly comprising seven lens elements, the seven lens elements being, 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, a sixth lens element and a seventh lens element; each of the seven lens elements having an object-side surface facing towards the object side and an image-side surface facing towards the image side;
wherein the first lens element has positive refractive power, at least one of the object-side surface and the image-side surface of the sixth lens element is aspheric, and the sixth lens element comprises at least one inflection point; at least one lens element with positive refractive power of the seven lens elements has an Abbe number smaller than 25; a central thickness of the fifth lens element is larger than a central thickness of the second lens element;
wherein a curvature radius of the object-side surface of the first lens element is R1, a central thickness of the first lens element is CT1, a focal length of the photographing optical lens assembly is f, and the following conditions are satisfied:
R 1/CT1<2.5; and
3.10< f/R 1<7.50.
2. The photographing optical lens assembly of claim 1 , wherein the second lens element with negative refractive power has the object-side surface being convex in a paraxial region thereof and the image-side surface being concave in a paraxial region thereof, the fourth lens element has the object-side surface being concave in a paraxial region thereof and the image-side surface being convex in a paraxial region thereof.
3. The photographing optical lens assembly of claim 1 , wherein the fifth lens element has positive refractive power; the sixth lens element with negative refractive power has the image-side surface being concave in a paraxial region thereof.
4. The photographing optical lens assembly of claim 1 , wherein the seventh lens element has the image-side surface being concave in a paraxial region thereof.
5. The photographing optical lens assembly of claim 1 , wherein there is an air gap between each of adjacent lens elements of the seven lens elements; a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and the following condition is satisfied:
−0.60< f 6/ f 7<0.60.
6. The photographing optical lens assembly of claim 1 , wherein the focal length of the photographing optical lens assembly is f, a maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:
2.42≤ f /Img H< 5.50.
7. The photographing optical lens assembly of claim 1 , wherein an axial distance between the fifth lens element and the sixth lens element is T56, a sum of all axial distances between adjacent lens elements of the photographing optical lens assembly is ΣAT, and the following condition is satisfied:
0.40< T 56/(Σ AT−T 56).
8. The photographing optical lens assembly of claim 1 , wherein an Abbe number of the seventh lens element is V7, and the following condition is satisfied:
V 7<30.
9. The photographing optical lens assembly of claim 1 , wherein a maximum optical effective radius of the object-side surface of the first lens element is Y11, a maximum image height of the photographing optical lens assembly is ImgH, and the following condition is satisfied:
0.45< Y 11/Img H< 1.0.
10. The photographing optical lens assembly of claim 1 , wherein the focal length of the photographing optical lens assembly is f, a focal length of the fourth lens element is f4, an axial distance between the image-side surface of the seventh lens element and an image surface is BL, a maximum image height of the photographing optical lens assembly is ImgH, and the following conditions are satisfied:
| f/f 4|<0.35; and
0.10< BL /Img H< 0.40.
11. The photographing optical lens assembly of claim 1 , wherein a vertical distance between a non-axial critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, a central thickness of the sixth lens element is CT6, and the following condition is satisfied:
0.5< Yc 62/CT6<7.5.
12. The photographing optical lens assembly of claim 1 , further comprising:
an aperture stop disposed on an object side of the third lens element, wherein an axial distance between the object-side surface of the first lens element and the aperture stop is Dr1s, the central thickness of the second lens element is CT2, a refractive power of the first lens element is P1, a refractive power of the second lens element is P2, a refractive power of the third lens element is P3, a refractive power of the fourth lens element is P4, a refractive power of the fifth lens element is P5, a refractive power of the sixth lens element is P6, a refractive power of the seventh lens element is P7, and the following conditions are satisfied:
2.0<| Dr 1 s |/CT2<5.0; and
(| P 3|+| P 4|+| P 5|+| P 7|)/(| P 1|+| P 2|+| P 6|)<0.50.
13. An image capturing device, comprising:
the photographing optical lens assembly of claim 1 ; and
an image sensor disposed on the image surface of the photographing optical lens assembly.
14. An electronic device, comprising:
the image capturing device of claim 13 .