Photographing optical lens system, imaging apparatus and electronic device
A photographing optical lens system includes 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 has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one lens surface of the seven lens elements has at least one inflection point thereon.
1. A photographing optical lens system 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;
wherein each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side, the first lens element has positive refractive power, the second lens element has positive refractive power, the third lens element has negative refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the second element is convex in a paraxial region thereof, the object-side surface of the sixth lens element is concave in a paraxial region thereof, the image-side surface of the seventh lens element is concave in a paraxial region thereof, at least one lens surface of the seven lens elements has at least one inflection point, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, a minimum among Abbe numbers of the seven lens elements is V min, half of a maximal field of view of the photographing optical lens system is HFOV, and the following conditions are satisfied:
❘
"\[LeftBracketingBar]"
f
2
/
f
1
❘
"\[RightBracketingBar]"
<
0.65
;
-
10.
<
(
R
3
+
R
4
)
/
(
R
3
-
R
4
)
<
1.
;
10.
<
V
min
<
21.
;
and
0.1
<
tan
(
HFOV
)
<
0.47
.
2. The photographing optical lens system of claim 1 , wherein half of the maximal field of view of the photographing optical lens system is HFOV, and the following condition is satisfied:
0
.
1
4
<
tan
(
HFOV
)
<
0.43
.
3. The photographing optical lens system of claim 1 , wherein the second lens element has positive refractive power and the fifth lens element has positive refractive power.
4. The photographing optical lens system of claim 1 , wherein the image-side surface of the fourth lens element is concave in a paraxial region thereof, and the image-side surface of the sixth lens element is convex in a paraxial region thereof.
5. The photographing optical lens system of claim 1 , wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, an f-number of the photographing optical lens system is Fno, a focal length of the photographing optical lens system is f, and the following condition is satisfied:
0
.
1
0
<
TL
*
Fno
/
f
<
3.
.
6. The photographing optical lens system of claim 1 , wherein a minimum among central thicknesses of the seven lens elements is CT min, a focal length of the photographing optical lens system is f, and the following condition is satisfied:
1
.0
<
(
CT
min
/
f
)
*
100
<
3
.
7
0
.
7. The photographing optical lens system of claim 1 , wherein an Abbe number of a lens element with positive refractive power among the seven lens elements is Vp, at least one of the lens elements with positive refractive power among the seven lens elements satisfies the following condition:
Vp
<
25.
0
.
8. The photographing optical lens system of claim 1 , wherein an absolute value of the focal length of the first lens element is larger than an absolute value of a focal length of the seventh lens element.
9. The photographing optical lens system of claim 1 , wherein an absolute value of a curvature radius of the image-side surface of the first lens element is larger than an absolute value of a curvature radius of the image-side surface of the seventh lens element.
10. The photographing optical lens system of claim 1 , wherein an axial distance between the sixth lens element and the seventh lens element is larger than a central thickness of the seventh lens element.
11. An imaging apparatus, comprising the photographing optical lens system of claim 1 and an image sensor disposed on an image surface of the photographing optical lens system.
12. An electronic device, comprising at least two imaging apparatuses facing the same direction; wherein the at least two imaging apparatuses comprise:
a first imaging apparatus comprising the photographing optical lens system and the image sensor of claim 11 ;
a second imaging apparatus comprising a photographing optical lens system and an image sensor disposed on an image surface of the photographing optical lens system;
wherein the first imaging apparatus has an angle of view between 25 to 60 degrees and the second imaging apparatus has an angle of view between 60 to 150 degrees.
13. A photographing optical lens system 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;
wherein each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side, the first lens element has positive refractive power, the second lens element has positive refractive power, the third lens element has negative refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is concave in a paraxial region thereof, the object-side surface of the second lens element is convex in a paraxial region thereof, the object-side surface of the sixth lens element is concave in a paraxial region thereof, the seventh lens element has negative refractive power, at least one lens surface of the seven lens elements has at least one inflection point, an axial distance between the first lens element and the second lens element is larger than an axial distance between the third lens element and the fourth lens element, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, and the following conditions are satisfied:
❘
"\[LeftBracketingBar]"
f
2
/
f
1
❘
"\[RightBracketingBar]"
<
0.65
;
and
-
10.
0
<
(
R
3
+
R
4
)
/
(
R
3
-
R
4
)
<
1.
.
14. The photographing optical lens system of claim 13 , wherein the image-side surface of the sixth lens element is convex in a paraxial region thereof and has at least one concave shape in an off-axis region thereof.
15. The photographing optical lens system of claim 13 , wherein a maximum image height of the photographing optical lens system is ImgH, a focal length of the photographing optical lens system is f, and the following condition is satisfied:
0
.
1
0
<
ImgH
/
f
<
0
.
4
7
.
16. The photographing optical lens system of claim 13 , wherein a maximum among central thicknesses of the seven lens elements is CT max, and a central thickness of the second lens element is CT2, and the following condition is satisfied:
1
.0
≦
CT
max
/
CT
2
<
1.2
.
17. The photographing optical lens system of claim 13 , wherein a maximum effective radius on the object-side surface of the first lens element is Y11, and a maximum image height of the photographing optical lens system is ImgH, and the following condition is satisfied:
0
.
6
5
<
Y
11
/
ImgH
<
1.5
.
18. The photographing optical lens system of claim 13 , wherein a central thickness of the second lens element is larger than a central thickness of the seventh lens element.
19. The photographing optical lens system of claim 13 , wherein an absolute value of the focal length of the first lens element is larger than an absolute value of a focal length of the fourth lens element.
20. The photographing optical lens system of claim 13 , wherein an absolute value of a curvature radius of the image-side surface of the first lens element is larger than an absolute value of a curvature radius of the image-side surface of the fourth lens element.