Photographing optical lens assembly, image capturing unit and electronic device
A photographing optical lens assembly includes five lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. Each of the five lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The image-side surface of the second lens element is concave in a paraxial region thereof. The third lens element has negative refractive power. The fourth lens element has positive refractive power. The object-side surface of the fifth lens element is convex in a paraxial region thereof, the image-side surface of the fifth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element has at least one inflection point.
1 . A photographing optical lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element, and each of the five lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the image-side surface of the second lens element is concave in a paraxial region thereof, the third lens element has negative refractive power, the fourth lens element has positive refractive power, the object-side surface of the fifth lens element is convex in a paraxial region thereof, the image-side surface of the fifth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element has at least one inflection point;
wherein an axial distance between the third lens element and the fourth lens element is T34, a central thickness of the fourth lens element is CT4, a focal length of the photographing optical lens assembly is f, a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, a curvature radius of the image-side surface of the fourth lens element is R8, an f-number of the photographing optical lens assembly is Fno, a refractive index of the second lens element is N2, and the following conditions are satisfied:
0.00< T 34/ CT 4<0.80;
−1.00< f 4/ f 2<0.70;
−0.10< f/R 8<5.80;
1.50< Fno< 4.00; and
1.63< N 2<1.85.
2 . The photographing optical lens assembly of claim 1 , wherein the focal length of the second lens element is f2, the focal length of the fourth lens element is f4, and the following condition is satisfied:
−0.70< f 4/ f 2<0.30.
3 . The photographing optical lens assembly of claim 1 , wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, and the following condition is satisfied:
2.40< CT 1/ CT 2<4.10.
4 . The photographing optical lens assembly of claim 1 , wherein the object-side surface of the third lens element is concave in a paraxial region thereof, a central thickness of the first lens element is CT1, the central thickness of the fourth lens element is CT4, and the following condition is satisfied:
1.40< CT 1/ CT 4<4.00.
5 . The photographing optical lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, and the following condition is satisfied:
−12.00<( R 5+ R 6)/( R 5− R 6)<0.00.
6 . The photographing optical lens assembly of claim 1 , wherein the object-side surface of the second lens element is convex in a paraxial region thereof.
7 . The photographing optical lens assembly of claim 1 , wherein a maximum value of axial distances between each of all adjacent lens elements of the photographing optical lens assembly is Max(AT), a sum of axial distances between each of all adjacent lens elements of the photographing optical lens assembly is ΣAT, a refractive index of the third lens element is N3, and the following conditions are satisfied:
0.20<Max( AT )/Σ AT< 0.42; and
1.45< N 3<1.63.
8 . The photographing optical lens assembly of claim 1 , wherein the axial distance between the third lens element and the fourth lens element is T34, a distance in parallel with an optical axis between a maximum effective radius position of the object-side surface of the first lens element and a maximum effective radius position of the image-side surface of the first lens element is ET1, and the following condition is satisfied:
0.00< T 34/ ET 1<0.80.
9 . The photographing optical lens assembly of claim 1 , wherein a central thickness of the second lens element is CT2, a maximum effective radius of the object-side surface of the first lens element is Y1R1, and the following condition is satisfied:
0.10< CT 2/ Y 1 R 1<0.80.
10 . An image capturing unit, comprising:
the photographing optical lens assembly of claim 1 ; and
an image sensor disposed on an image surface of the photographing optical lens assembly.
11 . An electronic device, comprising:
the image capturing unit of claim 10 .
12 . A photographing optical lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element, and each of the five lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the object-side surface of the second lens element is convex in a paraxial region thereof, the fourth lens element has positive refractive power, the image-side surface of the fifth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element has at least one inflection point;
wherein a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, a curvature radius of the image-side surface of the fourth lens element is R8, a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a central thickness of the fourth lens element is CT4, an axial distance between the third lens element and the fourth lens element is T34, a focal length of the photographing optical lens assembly is f, a composite focal length of the fourth lens element and the fifth lens element is f45, and the following conditions are satisfied:
−7.00<( R 5+ R 6)/( R 5− R 6)<−0.10;
2.00< CT 1/ CT 2<6.60;
0.00< T 34/ CT 4<0.75;
0.20< f/f 45<2.50; and
−0.20< f/R 8<6.50.
13 . The photographing optical lens assembly of claim 12 , wherein a refractive index of the second lens element is N2, and the following condition is satisfied:
1.63< N 2<1.85.
14 . The photographing optical lens assembly of claim 12 , wherein the image-side surface of the second lens element is concave in a paraxial region thereof.
15 . The photographing optical lens assembly of claim 12 , wherein an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, a maximum field of view of the photographing optical lens assembly is FOV, and the following conditions are satisfied:
0.85< T 12/ T 23<2.00; and
45.0 [deg.]< FOV< 130.0 [deg.].
16 . The photographing optical lens assembly of claim 12 , wherein an Abbe number of the third lens element is V3, and the following condition is satisfied:
28.00< V 3<70.00.
17 . The photographing optical lens assembly of claim 12 , wherein an f-number of the photographing optical lens assembly is Fno, a maximum value of axial distances between each of all adjacent lens elements of the photographing optical lens assembly is Max(AT), a sum of axial distances between each of all adjacent lens elements of the photographing optical lens assembly is ΣAT, and the following conditions are satisfied:
1.60< Fno< 2.60; and
0.15<Max( AT )/Σ AT< 0.50.
18 . The photographing optical lens assembly of claim 12 , wherein a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, and the following condition is satisfied:
−1.00< f 4/ f 2<0.50.
19 . The photographing optical lens assembly of claim 12 , wherein a composite focal length of the first lens element, the second lens element and the third lens element is f123, the composite focal length of the fourth lens element and the fifth lens element is f45, the central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, and the following conditions are satisfied:
0.75< f 123/ f 45<30.00; and
1.20< CT 3/ CT 2<5.00.
20 . The photographing optical lens assembly of claim 12 , wherein an axial distance between the second lens element and the third lens element is T23, a distance in parallel with an optical axis between a maximum effective radius position of the object-side surface of the first lens element and a maximum effective radius position of the image-side surface of the first lens element is ET1, and the following condition is satisfied:
0.10< T 23/ ET 1<1.00.
21 . A photographing optical lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element, and each of the five lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the object-side surface of the second lens element is convex in a paraxial region thereof, the third lens element has negative refractive power, the object-side surface of the third lens element is concave in a paraxial region thereof, the fourth lens element has positive refractive power, the image-side surface of the fourth lens element is concave in a paraxial region thereof, the image-side surface of the fifth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element has at least one inflection point;
wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, an axial distance between the third lens element and the fourth lens element is T34, a composite focal length of the first lens element, the second lens element and the third lens element is f123, a composite focal length of the fourth lens element and the fifth lens element is f45, and the following conditions are satisfied:
2.00< CT 1/ CT 2<5.80;
2.60< CT 1/ T 34<30.00; and
0.75< f 123/ f 45.
22 . The photographing optical lens assembly of claim 21 , wherein an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, and the following condition is satisfied:
0.80< T 12/ T 23<1.70.
23 . The photographing optical lens assembly of claim 21 , wherein a maximum value of axial distances between each of all adjacent lens elements of the photographing optical lens assembly is Max(AT), a sum of axial distances between each of all adjacent lens elements of the photographing optical lens assembly is ΣAT, and the following condition is satisfied:
0.15<Max( AT )/Σ AT< 0.50.
24 . The photographing optical lens assembly of claim 21 , wherein a focal length of the photographing optical lens assembly is f, a focal length of the second lens element is f2, and the following condition is satisfied:
−0.60< f/f 2<0.60.
25 . The photographing optical lens assembly of claim 21 , wherein a focal length of the photographing optical lens assembly is f, the composite focal length of the fourth lens element and the fifth lens element is f45, and the following condition is satisfied:
0.15< f/f 45<2.50.
26 . The photographing optical lens assembly of claim 21 , wherein an Abbe number of the third lens element is V3, and the following condition is satisfied:
28.00< V 3<70.00.
27 . The photographing optical lens assembly of claim 21 , wherein a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, and the following condition is satisfied:
−1.20<( R 7− R 8)/( R 7+ R 8)<0.40.
28 . The photographing optical lens assembly of claim 21 , wherein a central thickness of the fourth lens element is CT4, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following condition is satisfied:
0.07< CT 4/ TD< 0.20.
29 . The photographing optical lens assembly of claim 21 , wherein an axial distance between the fourth lens element and the fifth lens element is T45, a maximum effective radius of the object-side surface of the first lens element is Y1R1, and the following condition is satisfied:
0.05< T 45/ Y 1 R 1<1.00.