IP Library › Granted Patent US 9,229,193
Granted Patent B2
US 9,229,193 · App. 14/175,290 · Granted Jan 5, 2016

Imaging lens, and electronic apparatus including the same

Inventor: Chen-Cheng Liao (Taichung, TW)
Assignee: GENIUS ELECTRONIC OPTICAL CO., LTD.
G02B13/0045
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Quick Facts
Patent No.
US 9,229,193
App. No.
14/175,290
Granted
Jan 5, 2016
Kind
B2
Abstract

An imaging lens includes first to fifth lens elements arranged from an object side to an image side in the given order. Through designs of surfaces of the lens elements and relevant optical parameters, a short system length of the imaging lens may be achieved while maintaining good optical performance.

Claims (28)

1. An imaging lens comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in order from an object side to an image side along an optical axis of said imaging lens, each of said first lens element, said second lens element, said third lens element, said fourth lens element and said fifth lens element having a refractive power, an object-side surface facing toward the object side, and an image-side surface facing toward the image side, wherein:

said first lens element has a negative refractive power;

said second lens element has a positive refractive power, said object-side surface of said second lens element having a convex portion in a vicinity of a periphery of said second lens element;

said object-side surface of said third lens element has a concave portion in a vicinity of a periphery of said third lens element, and said image-side surface of said third lens element has a convex portion in a vicinity of a periphery of said third lens element;

said image-side surface of said fourth lens element has a convex portion in a vicinity of the optical axis;

said object-side surface of said fifth lens element has a concave portion in a vicinity of the optical axis, and said fifth lens element is made of a plastic material;

said imaging lens does not include any lens element with refractive power other than said first lens element, said second lens element, said third lens element, said fourth lens element and said fifth lens element; and

said imaging lens satisfies EFL/T 1 ≦5.00, where EFL represents a system focal length of said imaging lens, and T 1 represents a thickness of said first lens element at the optical axis.

2. The imaging lens as claimed in claim 1 , satisfying T 4 /T 1 ≦2.35, where T 4 represents a thickness of said fourth lens element at the optical axis.

3. The imaging lens as claimed in claim 2 , further satisfying BFL/CTmin≧2.10, where BFL represents a distance at the optical axis between said image-side surface of said fifth lens element and an image plane at the image side; and CTmin represents a minimum among thicknesses of said first lens element, said second lens element, said third lens element, said fourth lens element, and said fifth lens element at the optical axis.

4. The imaging lens as claimed in claim 3 , further satisfying CTmax/G 12 ≦3.00, where CTmax represents a maximum among the thicknesses of said first lens element, said second lens element, said third lens element, said fourth lens element, and said fifth lens element at the optical axis; and G 1 represents an air gap length between said first lens element and said second lens element at the optical axis.

5. The imaging lens as claimed in claim 3 , further satisfying CTmax/T 5 ≦2.70, where CTmax represents a maximum among thicknesses of said first lens element, said second lens element, said third lens element, said fourth lens element, and said fifth lens element at the optical axis; and T 5 represents the thickness of said fifth lens element at the optical axis.

6. The imaging lens as claimed in claim 2 , further satisfying EFL/T 5 ≦6.00, where T 5 represents a thickness of said fifth lens element at the optical axis.

7. The imaging lens as claimed in claim 6 , further satisfying T 2 /T 3 ≦1.70, where T 2 represents a thickness of said second lens element at the optical axis; and T 3 represents a thickness of said third lens element at the optical axis.

8. The imaging lens as claimed in claim 2 , further satisfying T 4 /G 12 ≦2.20, where G 12 represents an air gap length between said first lens element and said second lens element at the optical axis.

9. The imaging lens as claimed in claim 8 , further satisfying BFL/T 5 ≧2.00, where BFL represents a distance at the optical axis between said image-side surface of said fifth lens element and an image plane at the image side; and T 5 represents a thickness of said fifth lens element at the optical axis.

10. The imaging lens as claimed in claim 1 , satisfying BFL/CTmin≦2.10, where BFL represents a distance at the optical axis between said image-side surface of said fifth lens element and an image plane at the image side; and CTmin represents a minimum among thicknesses of said first lens element, said second lens element, said third lens element, said fourth lens element, and said fifth lens element at the optical axis.

11. The imaging lens as claimed in claim 10 , further satisfying T 4 /T 5 ≦2.75, where T 4 represents the thickness of said fourth lens element at the optical axis; and T 5 represents the thickness of said fifth lens element at the optical axis.

12. The imaging lens as claimed in claim 1 , satisfying T 4 /T 5 ≦2.75, where T 4 represents a thickness of said fourth lens element at the optical axis; and T 5 represents a thickness of said fifth lens element at the optical axis.

13. The imaging lens as claimed in claim 12 , further satisfying BFL/G 12 ≧1.50, where BFL represents a distance at the optical axis between said image-side surface of said fifth lens element and an image plane at the image side; and G 12 represents an air gap length between said first lens element and said second lens element at the optical axis.

14. The imaging lens as claimed in claim 1 , satisfying 1.40≦BFL/T 4 , where BFL represents a distance at the optical axis between said image-side surface of said fifth lens element and an image plane at the image side; and T 4 represents a thickness of said fourth lens element at the optical axis.

15. An electronic apparatus comprising:

a housing; and

an imaging module disposed in said housing, and including an imaging lens as claimed in claim 1 , a barrel on which said imaging lens is disposed, a holder unit on which said barrel is disposed, and an image sensor disposed at the image side of said imaging lens.

16. The imaging lens as claimed in claim 1 , wherein said object-side surface of said first lens element has a concave portion in a vicinity of a periphery of said first lens element.

17. The imaging lens as claimed in claim 16 , wherein said third lens element has a positive refractive power.

18. The imaging lens as claimed in claim 1 , wherein said third lens element has a positive refractive power.

19. The imaging lens as claimed in claim 1 , wherein said image-side surface of said fourth lens element further has a concave portion in a vicinity of a periphery of said fourth lens element.

Priority Claims (1)
TW 102135348 A · Sep 30, 2013 · national
Continuity (1)
Related Publication 20150092284A1 · Apr 2, 2015