Mobile device and optical imaging lens thereof
The present invention provides a mobile device and an optical imaging lens thereof. The optical imaging lens comprises six lens elements positioned in an order from an object side to an image side along an optical axis. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.
1. An optical imaging lens, sequentially from an object side to an image side, comprising first, second, third, fourth, fifth, and sixth lens elements, each of said lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein:
said object-side surface of said first lens element comprises a convex portion in a vicinity of the optical axis;
said image-side surface of said second lens element comprises a concave portion in a vicinity of a periphery of said second lens element;
said image-side surface of said third lens element comprises a convex portion in a vicinity of a periphery of said third lens element;
said image-side surface of said fourth lens element comprises a convex portion in a vicinity of the optical axis;
said image-side surface of said fifth lens element comprises a convex portion in a vicinity of a periphery of said fifth lens element; and
said image-side surface of said sixth lens element comprises a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of said sixth lens element;
said optical imaging lens as a whole having only the six lens elements having refractive power,
wherein a central thickness of said third lens element along the optical Axis is CT3;
wherein an air gap between said second lens element and said third lens element is AC23, an air gap between said third lens element and said fourth lens element is AC34; and
wherein CT3, AC23, and AC34 satisfy the equation:
2.30
≤
AC
23
+
CT
3
+
AC
34
CT
3
.
2. The optical imaging lens according to claim 1 , wherein an effective focal length of said optical imaging lens is EFL, and EFL and CT3 satisfy the equation:
6.00
≤
EFL
CT
3
.
3. The optical imaging lens according to claim 2 , wherein a distance from said object-side surface of said first lens element to said image-side surface of said sixth lens element is TL, a central thickness of said sixth lens element along the optical axis is CT6, and TL and CT6 satisfy:
7.60
≤
TL
CT
6
.
4. The optical imaging lens according to claim 3 , wherein an air gap between said fifth lens element and said sixth lens element is AC56, a central thickness of said second lens element along the optical axis is CT2, and EFL, AC56 and CT2 satisfy the equation:
5.00
≤
EFL
CT
2
+
AC
56
.
5. The optical imaging lens according to claim 1 , wherein a sum of all air gaps from said first lens element to said sixth lens element along the optical axis is AAG, and AC23, AC34, and AAG satisfy the equation:
AAG
AC
23
+
AC
34
≤
1.81
.
6. The optical imaging lens according to claim 1 , wherein an air gap between said first lens element and said second lens element is AC12, an air gap between said fourth lens element and said fifth lens element is AC45, and AC12, AC23, AC34, AC45, and AC56 satisfy the equation:
1.20
≤
AC
23
+
AC
34
AC
12
+
AC
45
+
AC
56
.
7. The optical imaging lens according to claim 1 , wherein an effective focal length of said optical imaging lens is EFL, a central thickness of said fourth lens element along the optical axis is CT4, a central thickness of said fifth lens element along the optical axis is CT5, and EFL, CT4, and CT5 satisfy the equation:
EFL
CT
4
+
CT
5
≤
5.40
.
8. The optical imaging lens according to claim 7 , wherein the sum of the thickness of all six lens elements along the optical axis is defined as ALT, a central thickness of said sixth lens element along the optical axis is CT6, and ALT and CT6 satisfy the equation:
5.50
≤
ALT
CT
6
.
9. The optical imaging lens according to claim 8 , wherein an air gap between said fifth lens element and said sixth lens element is AC56, and EFL, CT6, and AC56 satisfy the equation:
6.30
≤
EFL
CT
6
+
AC
56
.
10. The optical imaging lens according to claim 9 , wherein a central thickness of said third lens element is CT3, and EFL and CT3 satisfy the equation:
8.30
≤
EFL
CT
3
.
11. The optical imaging lens according to claim 9 , wherein said object-side surface of said sixth lens element further comprises a convex portion in a vicinity of a periphery of said sixth lens element.
12. The optical imaging lens according to claim 1 , wherein a distance from said object-side surface of said first lens element to said image-side surface of said sixth lens element is TL, a central thickness of said sixth lens element along the optical axis is CT6, and TL and CT6 satisfy:
7.60
≤
TL
CT
6
.
13. The optical imaging lens according to claim 12 , wherein a central thickness of said second lens element is CT2, a central thickness of said fourth lens element is CT4, a central thickness of said fifth lens element is CT5, and CT2, CT4, and CT5 satisfy the equation:
2.80
≤
CT
4
+
CT
5
CT
2
.
14. The optical imaging lens according to claim 13 , wherein said image-side surface of said third lens element further comprises a convex portion in a vicinity of the optical axis, and said object-side surface of said sixth lens element further comprises a concave portion in a vicinity of the optical axis.
15. The optical imaging lens according to claim 12 , wherein a central thickness of said second lens element is CT2, an air gap between said fifth lens element and said sixth lens element is AC56, and TL, CT2 and AC56 satisfy the equation:
5.50
≤
TL
CT
2
+
AC
56
.
16. The optical imaging lens according to claim 15 , wherein said object-side surface of said sixth lens element further comprises a concave portion in a vicinity of the optical axis, and said image-side surface of said fourth lens element further comprises a convex portion in a vicinity of a periphery of said fourth lens element.
17. A mobile device, comprising:
a housing; and
a photography module positioned in the housing and comprising:
a lens barrel;
an optical imaging lens as claimed in claim 1 and positioned in the lens barrel;
a module housing unit for positioning the lens barrel; and
an image sensor positioned at the image side of the optical imaging lens.
18. The mobile device according to claim 17 , wherein the module housing unit comprises a lens backseat, the lens backseat comprises a first lens seat and a second lens seat, the first lens seat is positioned close to the outside of the lens barrel and along with an axis, the second lens seat is positioned along the axis and around the outside of the first lens seat, and the lens barrel and the optical imaging lens positioned therein are driven by the first lens seat to move along the axis.
19. The mobile device according to claim 18 , wherein the module housing unit further comprises an image sensor backseat positioned between the second lens seat and the image sensor, and close to the second lens seat.