Mobile device and optical imaging lens thereof
View Patent ↗Present embodiments provide for mobile devices and optical imaging lens thereof. Optical imaging lens may comprise an aperture stop and six lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics and the total length of the optical imaging lens may be shortened.
1. An optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising first, second, third, fourth, fifth and sixth lens elements, each of said first, second, third, fourth, fifth and sixth lens elements having refracting power, an object-side surface facing toward the object side, an image-side surface facing toward the image side, and a central thickness defined along the optical axis, wherein:
said first lens element has positive refracting power, said object-side surface of said first lens element comprises a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the first lens element;
said second lens element has negative refracting power, said object-side surface of said second lens element comprises a concave portion in a vicinity of a periphery of the second lens element and a concave portion in a vicinity of the optical axis;
said image-side surface of said third lens element comprises a convex portion in a vicinity of a periphery of the third lens element;
said fourth lens element has positive refracting power;
said fifth lens element has positive refracting power, said image-side surface of said fifth lens element comprises a convex portion in a vicinity of a periphery of the fifth lens element;
said image-side surface of said sixth lens element comprises a convex portion in a vicinity of a periphery of the sixth lens element;
the optical imaging lens comprises no other lenses having refracting power beyond the six lens element, a sum of a central thicknesses of all six lens elements along the optical axis is represented by ALT, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, an air gap between the fourth lens element and the fifth lens element along the optical axis is represented by G45, ALT, G23 and G45 satisfy the equation: ALT/(G23+G45)≥9.0; and
a central thickness of the sixth lens element is represented by T6, an air gap between the first lens element and the second lens element along the optical axis is represented by G12, an air gap between the fifth lens element and the sixth lens element along the optical axis is represented by G56, T6, G12 and G56 satisfy the equation: T6/(G12+G56)≥0.7.
2. The optical imaging lens according to claim 1 , wherein a central thickness of the second lens element is represented by T2, a central thickness of the fifth lens element is represented by T5, T2 and T5 satisfy the equation: T5/T2≤2.2.
3. The optical imaging lens according to claim 2 , wherein a central thickness of the first lens element is represented by T1, a central thickness of the third lens element is represented by T3, T1 and T3 satisfy the equation: T1/T3≥0.8.
4. The optical imaging lens according to claim 2 , wherein a central thickness of the third lens element is represented by T3, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, T3 and G34 satisfy the equation: T3/G34≤3.
5. The optical imaging lens according to claim 2 , wherein an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, G12, G34 and G56 satisfy the equation: G34/(G12+G56)≥0.45.
6. The optical imaging lens according to claim 1 , wherein a central thickness of the third lens element is represented by T3, T3 and T6 satisfy the equation: T6/T3≥0.6.
7. The optical imaging lens according to claim 6 , wherein a central thickness of the first lens element is represented by T1, a central thickness of the second lens element is represented by T2, T1 and T2 satisfy the equation: T1/T2≤2.5.
8. The optical imaging lens according to claim 6 , wherein a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis is represented by AAG, a central thickness of the second lens element is represented by T2, AAG and T2 satisfy the equation: AAG/T2≤4.
9. The optical imaging lens according to claim 6 , wherein a central thickness of the second lens element is represented by T2, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, T2, G23 and G45 satisfy the equation: T2/(G23+G45)≥0.8.
10. The optical imaging lens according to claim 1 , wherein a central thickness of the second lens element is represented by T2, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, T2 and G34 satisfy the equation: T2/G34≥0.6.
11. The optical imaging lens according to claim 10 , wherein a central thickness of the fourth lens element is represented by T4, T4, G12 and G56 satisfy the equation: T4/(G12+G56)≥1.5.
12. The optical imaging lens according to claim 1 , wherein a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis is represented by AAG, AAG, G12 and G56 satisfy the equation: AAG/(G12+G56)≥2.
13. The optical imaging lens according to claim 12 , wherein a central thickness of the fourth lens element is represented by T4, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, an air gap between the fourth lens element and the fifth lens element along the optical axis is represented by G45, T4, G23 and G45 satisfy the equation: T4/(G23+G45)≥1.9.
14. The optical imaging lens according to claim 12 , wherein a central thickness of the second lens element is represented by T2, T2 and T6 satisfy the equation: T6/T2≤2.2.
15. The optical imaging lens according to claim 1 , wherein a central thickness of the second lens element is represented by T2, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, T2, G23 and G56 satisfy the equation: T2/(G23+G56)≥0.9.
16. The optical imaging lens according to claim 1 , wherein a central thickness of the second lens element is represented by T2, a central thickness of the third lens element is represented by T3, T2 and T3 satisfy the equation: T2/T3≥0.6.
17. The optical imaging lens according to claim 1 , wherein a sum of a central thicknesses of all six lens elements along the optical axis is represented by ALT, a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis is represented by AAG, ALT and AAG satisfy the equation: ALT/AAG≥3.5.
18. A mobile device, comprising:
a housing; and
a photography module positioned in the housing and comprising:
an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising first, second, third, fourth, fifth and sixth lens elements, each of said first, second, third, fourth, fifth and sixth lens elements having refracting power, an object-side surface facing toward the object side, an image-side surface facing toward the image side, and a central thickness defined along the optical axis, wherein:
said first lens element has positive refracting power, said object-side surface of said first lens element comprises a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery of the first lens element;
said second lens element has negative refracting power, said object-side surface of said second lens element comprises a concave portion in a vicinity of a periphery of the second lens element and a concave portion in a vicinity of the optical axis;
said image-side surface of said third lens element comprises a convex portion in a vicinity of a periphery of the third lens element;
said fourth lens element has positive refracting power;
said fifth lens element has positive refracting power, said image-side surface of said fifth lens element comprises a convex portion in a vicinity of a periphery of the fifth lens element;
said image-side surface of said sixth lens element comprises a convex portion in a vicinity of a periphery of the sixth lens element;
the optical imaging lens comprises no other lenses having refracting power beyond the six lens element, a sum of a central thicknesses of all six lens elements along the optical axis is represented by ALT, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, an air gap between the fourth lens element and the fifth lens element along the optical axis is represented by G45, ALT, G23 and G45 satisfy the equation: ALT/(G23+G45)≥9.0, and
a central thickness of the sixth lens element is represented by T6, an air gap between the first lens element and the second lens element along the optical axis is represented by G12, an air gap between the fifth lens element and the sixth lens element along the optical axis is represented by G56, T6, G12 and G56 satisfy the equation: T6/(G12+G56)≥0.7;
a lens barrel for positioning the optical imaging lens;
a module housing unit for positioning the lens barrel; and
an image sensor positioned at the image side of the optical imaging lens.