Optical lens assembly

• US 10,261,288 B2
• Filed: 05/03/2016
• Issued: 04/16/2019
• Est. Priority Date: 03/18/2016
• Status: Active Grant

• Current Assignee: Genius Electronic Optical Company Limited
• Original Assignee: Genius Electronic Optical Company Limited
• Inventors: Jhang, Jia-Sin, Lin, Maozong, Li, Feng
• Primary Examiner(s): Collins, Darryl J
• Assistant Examiner(s): O'Neill, Gary
• Application Number:
  US15/144,829
• Publication Number:
  US 20170269328A1
• Time in Patent Office: 1,078 Days
• Field of Search: 359713-715, 359745-747, 359754-758, 359763-766, 359771-778
• CPC Class Codes: G02B 13/004 having four lenses
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 9/34 having four components only
• CPC Class Codes: G02B 9/60 having five components only

Abstract

An optical lens assembly includes first, second, third and fourth lens elements arranged in sequence from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The first lens element has positive refracting power, and the image-side surface of the first lens element has a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of the periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of the periphery.

Claims

1. An optical lens assembly, comprising a first lens element, a second lens element, a third lens element, and a fourth lens element arranged in a sequence from an object side to an image side along an optical axis, the first lens element being arranged to be a lens element having refracting power in a first order from the object side to the image side, the second lens element being arranged to be a lens element having refracting power in a second order from the object side to the image side, the third lens element being arranged to be a lens element having refracting power in a second order from the image side to the object side, the fourth lens element being arranged to be a lens element having refracting power in a first order from the image side to the object side, and each of the first lens element to the fourth lens element comprising an object-side surface facing the object side and allowing imaging rays to pass through as well as an image-side surface facing the image side and allowing the imaging rays to pass through;

the first lens element having positive refracting power, and the object-side surface of the first lens element having a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery;

the second lens element having negative refracting power, and the object-side surface of the second lens element having a concave portion in a vicinity of a periphery;

the object-side surface of the third lens element having a concave portion in a vicinity of a periphery; and

the image-side surface of the fourth lens element having a convex portion in a vicinity of a periphery;

wherein the optical lens assembly satisfies;

(TTL×

F/#)/EFL≤

2.2; and

1.1≤

EFL/TTL≤

1.3,

wherein, TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, F/# is an f-number of the optical lens assembly, and EFL is an effective focal length of the optical lens assembly;

wherein the optical lens assembly further satisfies;

1.8≤

G23/T4≤

8.5,

wherein, G23 is a distance from the second lens element to the third lens element along the optical axis, and T4 is a thickness of the fourth lens element along the optical axis.

2. The optical lens assembly as recited in claim 1, wherein the optical lens assembly further satisfies:

1.2≤

G23/T1, wherein T1 is a thickness of the first lens element along the optical axis.

3. The optical lens assembly as recited in claim 1, wherein the optical lens assembly further satisfies:

7.3≤

EFL/T4≤

22.

4. The optical lens assembly as recited in claim 1, wherein the optical lens assembly further satisfies:

T3/G12≤

17, wherein T3 is a thickness of the third lens element along the optical axis, and G12 is a distance from the first lens element to the second lens element along the optical axis.

5. The optical lens assembly as recited in claim 1, wherein the optical lens assembly further satisfies:

ALT/G23≤

1.8, wherein ALT is a sum of thicknesses of the first lens element, the second lens element, the third lens element and the fourth lens element along the optical axis.

6. The optical lens assembly as recited in claim 1, wherein the optical lens assembly further satisfies:

2.505≤

AAG/T1, wherein AAG is a sum of a distance from the first lens element to the second lens element along the optical axis, a distance from the second lens element to the third lens element along the optical axis, and a distance from the third lens element to the fourth lens element along the optical axis, and T1 is a thickness of the first lens element along the optical axis.

7. The optical lens assembly as recited in claim 1, wherein the optical lens assembly further satisfies:

1.1≤

G23/BFL, wherein BFL is a distance from the image-side surface of the fourth lens element to the image plane along the optical axis.

8. The optical lens assembly as recited in claim 1, wherein the optical lens assembly further satisfies:

2.4≤

AAG/T4≤

9, wherein AAG is a sum of distances among the first lens element through the fourth lens element along the optical axis.

9. The optical lens assembly as recited in claim 1, wherein the optical lens assembly further satisfies:

8.4≤

EFL/T3, wherein T3 is a thickness of the third lens element along the optical axis.

10. An optical lens assembly, comprising a first lens element, a second lens element, a third lens element, and a fourth lens element arranged in a sequence from an object side to an image side along an optical axis, the first lens element being arranged to be a lens element having refracting power in a first order from the object side to the image side, the second lens element being arranged to be a lens element having refracting power in a second order from the object side to the image side, the third lens element being arranged to be a lens element having refracting power in a second order from the image side to the object side, the fourth lens element being arranged to be a lens element having refracting power in a first order from the image side to the object side, and each of the first lens element to the fourth lens element comprising an object-side surface facing the object side and allowing imaging rays to pass through as well as an image-side surface facing the image side and allowing the imaging rays to pass through;

the first lens element having positive refracting power, and the object-side surface of the first lens element having a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery;

the second lens element having negative refracting power, and the object-side surface of the second lens element having a concave portion in a vicinity of a periphery;

the object-side surface of the third lens element having a concave portion in a vicinity of a periphery; and

the image-side surface of the fourth lens element having a convex portion in a vicinity of a periphery, and the image-side surface of the fourth lens element having a concave portion in a vicinity of the optical axis;

wherein the optical lens assembly satisfies;

(TTL×

F/#)/EFL≤

2.2;

1.1≤

EFL/TL≤

1.6; and

AAG>

ALT,

wherein, TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis, F/# is an f-number of the optical lens assembly, EFL is an effective focal length of the optical lens assembly, TL is a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis, AAG is a sum of a distance from the first lens element to the second lens element along the optical axis, a distance from the second lens element to the third lens element along the optical axis, and a distance from the third lens element to the fourth lens element along the optical axis, and ALT is a sum of thicknesses of the first lens element, the second lens element, the third lens element, and the fourth lens element along the optical axis.

11. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

3.1≤

G23/T3≤

12, wherein G23 is a distance from the second lens element to the third lens element along the optical axis, and T3 is a thickness of the third lens element along the optical axis.

12. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

G23/T2≤

16, wherein G23 is a distance from the second lens element to the third lens element along the optical axis, and T2 is a thickness of the second lens element along the optical axis.

13. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

0.9≤

T2/G12, wherein T2 is a thickness of the second lens element along the optical axis, and G12 is a distance from the first lens element to the second lens element along the optical axis.

14. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

4.0≤

T1/G12, wherein T1 is a thickness of the first lens element along the optical axis, and G12 is a distance from the first lens element to the second lens element along the optical axis.

15. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

22.417≤

EFL/T2≤

39, wherein T2 is a thickness of the second lens element along the optical axis.

16. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

4.75≤

BFL/G12, wherein BFL is a distance from the image-side surface of the fourth lens element to the image plane along the optical axis, and G12 is a distance from the first lens element to the second lens element along the optical axis.

17. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

8.4≤

EFL/T3, wherein T3 is a thickness of the third lens element along the optical axis.

18. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

10.5≤

G23/G12≤

72, wherein G23 is a distance from the second lens element to the third lens element along the optical axis, and G12 is a distance from the first lens element to the second lens element along the optical axis.

19. The optical lens assembly as recited in claim 10, wherein the optical lens assembly further satisfies:

4.445≤

T4/G12, wherein T4 is a thickness of the fourth lens element along the optical axis, and G12 is a distance from the first lens element to the second lens element along the optical axis.