Image capturing lens assembly, image capturing unit and electronic device
An image capturing lens assembly includes six lens units which are, in order from an object side to an image side along an optical path: first through sixth lens units. Each lens unit of the first through third lens units and the fifth through sixth lens units is a single lens element. The fourth lens unit is a single lens element or is composed of two lens elements, and the fourth lens unit at least includes a front lens element. The total number of lens elements of the image capturing lens assembly is six to seven. The first lens unit has an image-side surface being concave in a paraxial region thereof. The third lens unit has an object-side surface being convex in a paraxial region thereof. The front lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof.
1 . An image capturing lens assembly comprising two lens groups, the two lens groups being, in order from an object side to an image side along an optical path, a first lens group and a second lens group, the two lens groups comprising six lens units, the six lens units being, in order from the object side to the image side along the optical path, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit and a sixth lens unit, the first lens group comprising the first lens unit, the second lens unit and the third lens unit, the second lens group comprising a front lens group and a rear lens group, the front lens group comprising the fourth lens unit, and the rear lens group comprising the fifth lens unit and the sixth lens unit;
wherein each of the first lens unit, the second lens unit, the third lens unit, the fifth lens unit and the sixth lens unit is a single lens element;
wherein the fourth lens unit is a single lens element or is composed of two lens elements; when the fourth lens unit is a single lens element, the fourth lens unit comprises a front lens element; when the fourth lens unit is composed of two lens elements, the fourth lens unit comprises, in order from the object side to the image side along the optical path, a front lens element and a rear lens element;
wherein a total number of lens groups of the image capturing lens assembly is two, a total number of lens units of the image capturing lens assembly is six, a total number of lens elements of the image capturing lens assembly is six to seven, each lens element of the image capturing lens assembly has an object-side surface facing toward the object side and an image-side surface facing toward the image side, and there is no additional lens element disposed between each of adjacent two of the six lens units;
wherein the image-side surface of the first lens unit is concave in a paraxial region thereof, the object-side surface of the third lens unit is convex in a paraxial region thereof, the front lens element has negative refractive power, and the image-side surface of the front lens element is concave in a paraxial region thereof;
wherein a maximum field of view of the image capturing lens assembly is FOV, an axial distance between the image-side surface of the front lens element and the object-side surface of the fifth lens unit is Dra2r9, an axial distance of the first lens group is DG1, an axial distance of the front lens group is DG2f, a central thickness of the front lens element is CTa, a central thickness of the fifth lens unit is CT5, an axial distance between the object-side surface of the first lens unit and an image surface is TL, an axial distance between the first lens unit and the second lens unit is T12, an entrance pupil diameter of the image capturing lens assembly is EPD, a focal length of the image capturing lens assembly is f, a composite focal length of the first lens unit and the second lens unit is f12, a composite focal length of the second lens unit and the third lens unit is f23, a focal length of the front lens group is fG2f, and the following conditions are satisfied:
10.
degrees
<
FOV
<
45.
degrees
;
0.65
<
Dra
2
r
9
/
CT
5
<
2
.10
;
DG
1
/
DG
2
f
<
1.68
;
2.4
<
TL
/
EPD
<
4
.10
;
-
1.3
<
f
/
f
23
-
❘
"\[LeftBracketingBar]"
f
/
f
12
❘
"\[RightBracketingBar]"
+
f
/
fG
2
f
<
3
.00
;
and
10
×
T
1
2
/
CTa
<
2
.
5
0
.
2 . The image capturing lens assembly of claim 1 , further comprising an aperture stop disposed at an object side of the second lens group, wherein at least one of the object-side surface and the image-side surface of at least one lens element of the first lens group is spherical.
3 . The image capturing lens assembly of claim 1 , wherein the focal length of the image capturing lens assembly is f, a focal length of the first lens group is fG1, a curvature radius of the image-side surface of the first lens unit is R2, a curvature radius of the image-side surface of the front lens element is Ra2, and the following conditions are satisfied:
0.1
<
f
/
fG
1
<
1.6
;
and
0.8
<
❘
"\[LeftBracketingBar]"
R
2
/
Ra
2
❘
"\[RightBracketingBar]"
<
1
5
.
0
0
.
4 . The image capturing lens assembly of claim 1 , wherein a curvature radius of the image-side surface of the second lens unit is R4, a curvature radius of the image-side surface of the third lens unit is R6, the focal length of the image capturing lens assembly is f, an axial distance between the fifth lens unit and the sixth lens unit is T56, the axial distance between the object-side surface of the first lens unit and the image surface is TL, a central thickness of the sixth lens unit is CT6, a maximum image height of the image capturing lens assembly is ImgH, and the following conditions are satisfied:
2.5
<
❘
"\[LeftBracketingBar]"
R
4
❘
"\[RightBracketingBar]"
/
f
+
❘
"\[LeftBracketingBar]"
R
6
❘
"\[RightBracketingBar]"
/
f
;
and
3.3
<
T
56
/
CT
6
+
TL
/
ImgH
<
10.5
.
5 . The image capturing lens assembly of claim 1 , wherein an Abbe number of the first lens unit is V1, an Abbe number of the second lens unit is V2, an Abbe number of the front lens element is Va, and the following condition is satisfied:
1.
<
(
V
1
+
V
2
)
/
Va
<
3
.
8
0
.
6 . The image capturing lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the second lens unit is R3, a curvature radius of the image-side surface of the front lens element is Ra2, the focal length of the image capturing lens assembly is f, the composite focal length of the first lens unit and the second lens unit is f12, the composite focal length of the second lens unit and the third lens unit is f23, and the following conditions are satisfied:
0.6
<
❘
"\[LeftBracketingBar]"
R
3
/
Ra
2
❘
"\[RightBracketingBar]"
<
20.
;
and
0.
<
f
/
f
12
+
f
/
f
2
3
.
7 . The image capturing lens assembly of claim 1 , wherein the fourth lens unit is composed of two lens elements, and the sixth lens unit has negative refractive power.
8 . The image capturing lens assembly of claim 7 , wherein the rear lens element has positive refractive power, and at least one lens element of the image capturing lens assembly is made of glass material.
9 . The image capturing lens assembly of claim 1 , wherein a distance in parallel with an optical axis between a maximum effective radius position of the object-side surface of the front lens element and a maximum effective radius position of the image-side surface of the front lens element is ETa, a distance in parallel with the optical axis between a maximum effective radius position of the object-side surface of the fifth lens unit and a maximum effective radius position of the image-side surface of the fifth lens unit is ET5, a maximum effective radius of the object-side surface of the first lens unit is Y1R1, a maximum effective radius of the image-side surface of the sixth lens unit is Y6R2, a maximum value of an absolute value of a distortion aberration on the image surface at various fields of view is |Dist|max, and the following conditions are satisfied:
0.8
<
ETa
/
ET
5
<
3.5
;
0.5
<
Y
6
R
2
/
Y
1
R
1
<
1.6
;
and
❘
"\[LeftBracketingBar]"
Dist
❘
"\[RightBracketingBar]"
max
<
5.
%
.
10 . An image capturing unit, comprising:
the image capturing lens assembly of claim 1 ; and
an image sensor disposed on the image surface of the image capturing lens assembly.
11 . An electronic device, comprising:
the image capturing unit of claim 10 .
12 . An image capturing lens assembly comprising two lens groups, the two lens groups being, in order from an object side to an image side along an optical path, a first lens group and a second lens group, the two lens groups comprising six lens units, the six lens units being, in order from the object side to the image side along the optical path, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit and a sixth lens unit, the first lens group comprising the first lens unit, the second lens unit and the third lens unit, the second lens group comprising a front lens group and a rear lens group, the front lens group comprising the fourth lens unit, and the rear lens group comprising the fifth lens unit and the sixth lens unit;
wherein each of the first lens unit, the second lens unit, the third lens unit, the fifth lens unit and the sixth lens unit is a single lens element;
wherein the fourth lens unit is a single lens element or is composed of two cemented lens elements; when the fourth lens unit is a single lens element, the fourth lens unit comprises a front lens element; when the fourth lens unit is composed of two cemented lens elements, the fourth lens unit comprises, in order from the object side to the image side along the optical path, a front lens element and a rear lens element;
wherein a total number of lens groups of the image capturing lens assembly is two, a total number of lens units of the image capturing lens assembly is six, a total number of lens elements of the image capturing lens assembly is six to seven, each lens element of the image capturing lens assembly has an object-side surface facing toward the object side and an image-side surface facing toward the image side, and there is no additional lens element disposed between each of adjacent two of the six lens units;
wherein the image-side surface of the first lens unit is concave in a paraxial region thereof, the object-side surface of the third lens unit is convex in a paraxial region thereof, the front lens element has negative refractive power, and the image-side surface of the front lens element is concave in a paraxial region thereof;
wherein a maximum field of view of the image capturing lens assembly is FOV, an axial distance of the first lens group is DG1, an axial distance of the front lens group is DG2f, an axial distance between the object-side surface of the first lens unit and an image surface is TL, an entrance pupil diameter of the image capturing lens assembly is EPD, a curvature radius of a most-object-side surface of the fourth lens unit is RU4f, a curvature radius of a most-image-side surface of the fourth lens unit is RU4r, a focal length of the second lens unit is f2, a focal length of the third lens unit is f3, a focal length of the fifth lens unit is f5, and the following conditions are satisfied:
15.
degrees
<
FOV
<
42.
degrees
;
DG
1
/
DG
2
f
<
1.68
;
2.4
<
TL
/
EPD
<
4
.10
;
RU
4
f
/
RU
4
r
<
7.5
;
and
1.6
<
❘
"\[LeftBracketingBar]"
f
3
+
f
5
❘
"\[RightBracketingBar]"
/
❘
"\[LeftBracketingBar]"
f
2
❘
"\[RightBracketingBar]"
.
13 . The image capturing lens assembly of claim 12 , wherein at least one of the object-side surface and the image-side surface of at least one lens element of the first lens group is spherical.
14 . The image capturing lens assembly of claim 12 , wherein the axial distance of the first lens group is DG1, an axial distance of the second lens group is DG2, an Abbe number of the first lens unit is V1, an Abbe number of the second lens unit is V2, an Abbe number of the front lens element is Va, and the following conditions are satisfied:
0.2
<
DG
1
/
DG
2
<
0.65
;
and
1.
<
(
V
1
+
V
2
)
/
Va
<
3
.
8
0
.
15 . The image capturing lens assembly of claim 12 , wherein an axial distance between the fifth lens unit and the sixth lens unit is T56, the axial distance between the object-side surface of the first lens unit and the image surface is TL, a central thickness of the sixth lens unit is CT6, a maximum image height of the image capturing lens assembly is ImgH, a curvature radius of the object-side surface of the first lens unit is R1, a curvature radius of the image-side surface of the first lens unit is R2, and the following conditions are satisfied:
3.3
<
T
56
/
CT
6
+
TL
/
ImgH
<
10.5
;
and
0.25
<
❘
"\[LeftBracketingBar]"
R
1
/
R
2
❘
"\[RightBracketingBar]"
.
16 . The image capturing lens assembly of claim 12 , wherein a focal length of the image capturing lens assembly is f, a composite focal length of the first lens unit and the second lens unit is f12, a composite focal length of the second lens unit and the third lens unit is f23, a focal length of the front lens group is fG2f, and the following condition is satisfied:
-
1.5
<
f
/
f
23
-
❘
"\[LeftBracketingBar]"
f
/
f
12
❘
"\[RightBracketingBar]"
+
f
/
fG
2
f
<
3.5
.
17 . The image capturing lens assembly of claim 12 , further comprising an aperture stop, wherein a maximum image height of the image capturing lens assembly is ImgH, an axial distance between the aperture stop and the image-side surface of the sixth lens unit is SD, the axial distance between the object-side surface of the first lens unit and the image surface is TL, and the following condition is satisfied:
4.3
<
1
0
×
(
ImgH
/
SD
+
ImgH
/
TL
)
<
8
.
9
0
.
18 . The image capturing lens assembly of claim 12 , wherein a focal length of the image capturing lens assembly is f, a focal length of the first lens group is fG1, a focal length of the second lens group is fG2, an axial distance between the image-side surface of the front lens element and the object-side surface of the fifth lens unit is Dra2r9, a central thickness of the fifth lens unit is CT5, and the following conditions are satisfied:
0.25
<
❘
"\[LeftBracketingBar]"
f
/
fG
1
❘
"\[RightBracketingBar]"
+
❘
"\[LeftBracketingBar]"
f
/
fG
2
❘
"\[RightBracketingBar]"
;
and
0.65
<
Dra
2
r
9
/
CT
5
<
2
.
1
0
.
19 . The image capturing lens assembly of claim 12 , wherein the fourth lens unit is composed of two cemented lens elements, and the rear lens element has positive refractive power;
wherein an axial distance between the front lens element and the rear lens element is Tab, and the following condition is satisfied:
0.001 millimeters<Tab<0.020 millimeters.
20 . The image capturing lens assembly of claim 12 , wherein the maximum field of view of the image capturing lens assembly is FOV, an axial distance between the image-side surface of the front lens element and the object-side surface of the fifth lens unit is Dra2r9, the axial distance of the first lens group is DG1, the axial distance of the front lens group is DG2f, a central thickness of the front lens element is CTa, a central thickness of the fifth lens unit is CT5, the axial distance between the object-side surface of the first lens unit and the image surface is TL, an axial distance between the first lens unit and the second lens unit is T12, the entrance pupil diameter of the image capturing lens assembly is EPD, a focal length of the image capturing lens assembly is f, the focal length of the second lens unit is f2, the focal length of the third lens unit is f3, the focal length of the fifth lens unit is f5, a composite focal length of the first lens unit and the second lens unit is f12, a composite focal length of the second lens unit and the third lens unit is f23, a focal length of the front lens group is fG2f, the curvature radius of the most-object-side surface of the fourth lens unit is RU4f, the curvature radius of the most-image-side surface of the fourth lens unit is RU4r, and the following conditions are satisfied:
29.8
degrees
≤
FOV
≤
37.
degrees
;
0.81
≤
Dra
2
r
9
/
CT
5
≤
1.81
;
0.6
≤
DG
1
/
DG
2
f
≤
1.44
;
2.71
≤
TL
/
EPD
≤
3
.73
;
-
0.8
1
≤
f
/
f
23
-
❘
"\[LeftBracketingBar]"
f
/
f
12
❘
"\[RightBracketingBar]"
+
f
/
fG
2
f
≤
2.28
;
0.06
≤
10
×
T
12
/
CTa
≤
1.31
;
-
2.9
1
≤
RU
4
f
/
RU
4
r
≤
1.98
;
and
1.75
≤
❘
"\[LeftBracketingBar]"
f
3
+
f
5
❘
"\[RightBracketingBar]"
/
❘
"\[LeftBracketingBar]"
f
2
❘
"\[RightBracketingBar]"
≤
48.28
.
21 . An image capturing lens assembly comprising two lens groups, the two lens groups being, in order from an object side to an image side along an optical path, a first lens group and a second lens group, the two lens groups comprising six lens units, the six lens units being, in order from the object side to the image side along the optical path, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit and a sixth lens unit, the first lens group comprising the first lens unit, the second lens unit and the third lens unit, the second lens group comprising a front lens group and a rear lens group, the front lens group comprising the fourth lens unit, and the rear lens group comprising the fifth lens unit and the sixth lens unit;
wherein each of the first lens unit, the second lens unit, the third lens unit, the fifth lens unit and the sixth lens unit is a single lens element, the fourth lens unit is composed of two lens elements, and the fourth lens unit comprises, in order from the object side to the image side along the optical path, a front lens element and a rear lens element;
wherein a total number of lens groups of the image capturing lens assembly is two, a total number of lens units of the image capturing lens assembly is six, a total number of lens elements of the image capturing lens assembly is seven, each lens element of the image capturing lens assembly has an object-side surface facing toward the object side and an image-side surface facing toward the image side, and there is no additional lens element disposed between each of adjacent two of the six lens units;
wherein the object-side surface of the third lens unit is convex in a paraxial region thereof, the object-side surface of the front lens element is concave in a paraxial region thereof, and the sixth lens unit has negative refractive power;
wherein a maximum field of view of the image capturing lens assembly is FOV, an axial distance between the object-side surface of the front lens element and the object-side surface of the fifth lens unit is Dra1r9, an axial distance between the image-side surface of the front lens element and the object-side surface of the fifth lens unit is Dra2r9, an axial distance between the first lens unit and the second lens unit is T12, a central thickness of the front lens element is CTa, a central thickness of the first lens unit is CT1, a central thickness of the second lens unit is CT2, a central thickness of the fifth lens unit is CT5, an axial distance between the front lens element and the rear lens element is Tab, a focal length of the second lens unit is f2, a focal length of the third lens unit is f3, a focal length of the fifth lens unit is f5, and the following conditions are satisfied:
10.
degrees
<
FOV
<
55.
degrees
;
0.5
<
Dra
2
r
9
/
CT
5
<
2
.30
;
3.
<
Dra
1
r
9
/
CT
1
<
15.
;
and
1.8
<
0
.
1
×
CT
2
/
Tab
.
22 . The image capturing lens assembly of claim 21 , wherein at least one of the object-side surface and the image-side surface of at least one lens element of the first lens group is spherical, at least one lens element of the image capturing lens assembly is made of glass material, and there is no relative displacement between each adjacent two lens elements of the image capturing lens assembly.
23 . The image capturing lens assembly of claim 21 , wherein a focal length of the image capturing lens assembly is f, a focal length of the first lens unit is f1, the focal length of the second lens unit is f2, a curvature radius of the object-side surface of the first lens unit is R1, a curvature radius of the object-side surface of the fifth lens unit is R9, a curvature radius of the image-side surface of the sixth lens unit is R12, and the following conditions are satisfied:
-
0
.
7
0
<
f
/
f
1
+
f
/
f
2
<
1.15
;
and
❘
"\[LeftBracketingBar]"
R
1
❘
"\[RightBracketingBar]"
/
f
+
❘
"\[LeftBracketingBar]"
R
9
❘
"\[RightBracketingBar]"
/
f
+
❘
"\[LeftBracketingBar]"
R
12
❘
"\[RightBracketingBar]"
/
f
<
25.
.
24 . The image capturing lens assembly of claim 21 , wherein an axial distance of the first lens group is DG1, an axial distance of the front lens group is DG2f, a curvature radius of the image-side surface of the front lens element is Ra2, a curvature radius of the object-side surface of the rear lens element is Rb1, a focal length of the image capturing lens assembly is f, and the following conditions are satisfied:
DG
1
/
DG
2
f
<
1.8
;
and
❘
"\[LeftBracketingBar]"
Ra
2
❘
"\[RightBracketingBar]"
/
f
+
❘
"\[LeftBracketingBar]"
Rb
1
❘
"\[RightBracketingBar]"
/
f
<
3.3
.
25 . The image capturing lens assembly of claim 21 , wherein an axial distance between the object-side surface of the first lens unit and an image surface is TL, an entrance pupil diameter of the image capturing lens assembly is EPD, and the following condition is satisfied:
1.
5
0
<
TL
/
EPD
<
4
.
1
0
.
26 . The image capturing lens assembly of claim 21 , further comprising an aperture stop, wherein an axial distance between the fifth lens unit and the sixth lens unit is T56, an axial distance between the object-side surface of the first lens unit and an image surface is TL, a central thickness of the sixth lens unit is CT6, a maximum image height of the image capturing lens assembly is ImgH, an axial distance between the aperture stop and the object-side surface of the fifth lens unit is Dsr9, an axial distance between the aperture stop and the image-side surface of the fifth lens unit is Dsr10, and the following conditions are satisfied:
3.3
<
T
56
/
CT
6
+
TL
/
ImgH
<
10.5
;
and
Dsr
9
/
Dsr
10
<
0.98
.
27 . The image capturing lens assembly of claim 21 , wherein the rear lens element has positive refractive power, and the object-side surface of the rear lens element is convex in a paraxial region thereof.
28 . The image capturing lens assembly of claim 21 , wherein at least one of the object-side surface and the image-side surface of each of at least three lens elements of the image capturing lens assembly is spherical;
wherein a maximum image height of the image capturing lens assembly is ImgH, a maximum effective radius of the object-side surface of the first lens unit is Y1R1, a maximum effective radius of the object-side surface of the second lens unit is Y2R1, and the following condition is satisfied:
0.65
<
2
×
ImgH
/
(
Y
1
R
1
+
Y
2
R
1
)
<
2
.
0
0
.
29 . The image capturing lens assembly of claim 21 , wherein the maximum field of view of the image capturing lens assembly is FOV, the axial distance between the object-side surface of the front lens element and the object-side surface of the fifth lens unit is Dra1r9, the axial distance between the image-side surface of the front lens element and the object-side surface of the fifth lens unit is Dra2r9, the central thickness of the first lens unit is CT1, the central thickness of the second lens unit is CT2, the central thickness of the fifth lens unit is CT5, the axial distance between the front lens element and the rear lens element is Tab, and the following conditions are satisfied:
29.8
degrees
≤
FOV
≤
37.
degrees
;
0.98
≤
Dra
2
r
9
/
CT
5
≤
1.91
;
3.38
≤
9
/
Dra
1
r
9
/
CT
1
≤
9.51
;
and
3.24
≤
0.1
×
CT
2
/
Tab
≤
65.72
.