Photographing optical lens system, imaging apparatus and electronic device

• US 10,845,576 B2
• Filed: 08/29/2018
• Issued: 11/24/2020
• Est. Priority Date: 03/28/2018
• Status: Active Grant

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: Huang, Hsin-Hsuan
• Primary Examiner(s): Greece, James R
• Application Number:
  US16/116,011
• Publication Number:
  US 20190302423A1
• Time in Patent Office: 818 Days
• Field of Search: 359708
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 13/006 at least one element being a compound optical element, e.g. cemented elements
• CPC Class Codes: G02B 9/64 having more than six components

Abstract

A photographing optical lens system includes seven lens elements, the seven lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one lens surface of the seven lens elements has at least one inflection point thereon.

Claims

1. A photographing optical lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side:

a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element,

wherein each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side, at least one lens surface of the seven lens elements has at least one inflection point thereon, atleast two lens elements of the seven lens elements have Abbe number between 10.0 and 20.0, an axial distance between an object-side surface of the first lens element and an image surface is TL, an f-number of the photographing optical lens system is Fno, a focal length of the photographing optical lens system is f, a maximum image height of the photographing optical lens system is ImgH, a minimum among Abbe numbers of the seven lens elements is Vmin, and the following conditions are satisfied;

0.50<

TL*Fno/f<

2.10;

0.10<

ImgH/f<

0.47; and

10.0<

Vmin<

23.0.

2. The photographing optical lens system of claim 1, wherein the first lens element has an object-side surface being convex in a paraxial region thereof, the first lens element has an image-side surface being concave in a paraxial region thereof, and the second lens element has an object-side surface being convex in a paraxial region thereof.

3. The photographing optical lens system of claim 1, wherein the third lens element has negative refractive power.

4. The photographing optical lens system of claim 1, wherein the sixth lens element has positive refractive power, and the seventh lens element has negative refractive power.

5. The photographing optical lens system of claim 1, wherein an Abbe number of a lens element with positive refractive power among the seven lens elements is Vp, and at least one the lens element with positive refractive power satisfies the following condition:

Vp<

25.0.

6. The photographing optical lens system of claim 1, wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, and the following condition is satisfied:

|f2/f1|<

1.20.

7. The photographing optical lens system of claim 1, further comprising an aperture stop, wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, the f-number of the photographing optical lens system is Fno, the focal length of the photographing optical lens system is f, an axial distance between the aperture stop and an image-side surface of the seventh lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, half of a maximal field of view is HFOV, and the following conditions are satisfied:

0.50<

TL*Fno/f<

1.85;

0.60<

SD/TD<

0.90; and

0.14<

tan(HFOV)<

0.43.

8. The photographing optical lens system of claim 1, wherein a minimum among central thicknesses of the seven lens elements is CTmin, the focal length of the photographing optical lens system is f, an entrance pupil diameter of the photographing optical lens system is EPD, an axial distance between an image-side surface of the seventh lens element and the image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, and the following conditions are satisfied:

1.0<

(CTmin/f)*100<

3.70;

1.0<

f/EPD<

1.90; and

0.05<

BL/TD<

0.35.

9. The photographing optical lens system of claim 1, wherein the focal length of the photographing optical lens system is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, a minimum among |f/f1|, |f/f2|, |f/f3|, |f/f4|, |f/f5|, |f/f6|, and |f/f7| is |f/fi|min, and the following condition is satisfied:

|f/fi|min<

0.10.

10. The photographing optical lens system of claim 1, wherein at least one lens surface of the sixth lens element and the seventh lens element has at least one inflection point thereon, a vertical distance between the at least one inflection point and an optical axis is Yp, the focal length of the photographing optical lens system is f, and the following condition is satisfied:

0.01<

Yp/f<

1.0.

11. A photographing optical lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side:

a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element,

wherein each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side, the second lens element has positive refractive power, at least one lens surface of the seven lens elements has at least one inflection point thereon, at least two lens elements of the seven lens elements have Abbe numbers between 10.0 and 20.0, an axial distance between an object-side surface of the first lens element and an image surface is TL, an f-number of the photographing optical lens system is Fno, a focal length of the photographing optical lens system is f, a maximum image height of the photographing optical lens system is ImgH, a minimum among Abbe numbers of the seven lens elements is Vmin, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, a focal length of the first lens element is f1, a focal length of the second lens element is f2, and the following conditions are satisfied;

0.10<

TL*Fno/f<

3.0;

0.10<

ImgH/f<

0.53;

8.0<

Vmin<

25.0;

1.40<

(T45+T56)/(T12+T23+T34)<

40; and

|f2/f1|<

0.65.

12. The photographing optical lens system of claim 11, wherein the second lens element has an object-side surface being convex in a paraxial region thereof, the seventh lens element has an image-side surface being concave in a paraxial region thereof and has at least one convex surface in an off-axis region of the image-side surface thereof.

13. The photographing optical lens system of claim 11, wherein the sixth lens element has positive refractive power and the seventh lens element has negative refractive power.

14. The photographing optical lens system of claim 11, wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, the focal length of the photographing optical lens system is f, a maximum among refractive indices of the seven lens elements is Nmax, and the following conditions are satisfied:

0.30<

TL/f<

1.25; and

1.58<

Nmax<

1.72.

15. The photographing optical lens system of claim 11, wherein the focal length of the photographing optical lens system is f, the focal length of the first lens element is f1, the focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, and the following condition is satisfied:

0.10<

(|f/f1|+|f/f3|+|f/f4|+|f/f5|+|f/f6|+|f/f7|)/|f/f2|<

3.80.

16. The photographing optical lens system of claim 11, wherein a maximum among central thicknesses of the seven lens elements is CTmax, a central thickness of the second lens element is CT2, and the following condition is satisfied:

1.0<

CTmax/CT2<

1.20.

17. A photographing optical lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side:

a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element,

wherein each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side, at least one lens surface of the seven lens elements has at least one inflection point thereon, at least two lens elements of the seven lens elements have Abbe numbers between 10.0 and 20.0, an axial distance between an object-side surface of the first lens element and an image surface is TL, an f-number of the photographing optical lens system is Fno, a focal length of the photographing optical lens system is f, a maximum image height of the photographing optical lens system is ImgH, a minimum among Abbe numbers of the seven lens elements is Vmin, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, a curvature radius of an object-side surface of the second lens element is R3, a curvature radius of an image-side surface of the second lens element is R4, an axial distance between an image-side surface of the seventh lens element and the image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, and the following conditions are satisfied;

0.10<

TL*Fno/f<

3.0;

0.10<

ImgH/f<

0.53;

8.0<

Vmin<

25.0;

1.40<

(T45+T56)/(T12+T23+T34)<

40;

−

10.0<

(R3+R4)/(R3−

R4)<

1.0; and

0.03<

BL/TD<

0.70.

18. The photographing optical lens system of claim 17, wherein the seventh lens element has the image-side surface being concave in a paraxial region thereof and has at least one convex surface in an off-axis region of the image-side surface thereof.

19. The photographing optical lens system of claim 17, wherein at least one lens surface of the sixth lens element and the seventh lens element has at least one inflection point thereon, the axial distance between the object-side surface of the first lens element and the image surface is TL, the maximum image height of the photographing optical lens system is ImgH, and the following condition is satisfied:

1.50<

TL/ImgH<

3.30.

20. The photographing optical lens system of claim 17, wherein the axial distance between the first lens element and the second lens element is T12, the axial distance between the second lens element and the third lens element is T23, the axial distance between the third lens element and the fourth lens element is T34, the axial distance between the fourth lens element and the fifth lens element is T45, the axial distance between the fifth lens element and the sixth lens element is T56, and the following condition is satisfied:

2.0<

(T45+T56)/(T12+T23+T34)<

15.0.

21. The photographing optical lens system of claim 17, wherein a maximum effective radius on the object-side surface of the first lens element is Y11, the maximum image height of the photographing optical lens system is ImgH, and the following condition is satisfied:

0.65<

Y11/ImgH<

1.50.

22. The photographing optical lens system of claim 17, wherein an entrance pupil diameter of the photographing optical lens system is EPD, a maximum among maximum effective radii on object-side surfaces and image-side surfaces of the seven lens elements is Ymax, and the following condition is satisfied:

1.40<

EPD/Ymax<

2.50.

23. The photographing optical lens system of claim 17, wherein an Abbe number of the fourth lens element is V4, an Abbe number of the sixth lens element is V6, and the following condition is satisfied:

8.0<

V4<

30.0;

8.0<

V6<

30.0.

24. The photographing optical lens system of claim 17, wherein the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, and the following condition is satisfied:

−

2.0<

(R3+R4)/(R3−

R4)<

0.30.

25. The photographing optical lens system of claim 17, wherein the axial distance between the image-side surface of the seventh lens element and the image surface is BL, the axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, a focal length of the first lens element is f1, a focal length of the second lens element is f2, and the following conditions are satisfied:

0.05<

BL/TD<

0.35; and

|f2/f1|<

1.20.

26. The photographing optical lens system of claim 17, wherein a first lens group comprises the first lens element and the second lens element, a second lens group comprises the third lens element, the fourth lens element and the fifth lens element, and there is a gap between the first lens group and the second lens group;

a composite focal length of the first lens element and the second lens element is f12, a composite focal length of the third lens element, the fourth lens element, and the fifth lens element is f345, and the following condition is satisfied;

−

1.0<

f12/f345<

0.

27. The photographing optical lens system of claim 17, wherein a distance in parallel with an optical axis from an axial vertex of the image-side surface of the seventh lens element to a maximum effective radius position thereof is SAG72, a central thickness of the seventh lens element is CT7, the axial distance between the object-side surface of the first lens element and the image surface is TL, the f-number of the photographing optical lens system is Fno, the focal length of the photographing optical lens system is f, half of a maximal field of view is HFOV, and the following conditions are satisfied:

−

3.50<

SAG72/CT7<

−

0.20;

0.10<

TL*Fno/f<

2.50; and

0.10<

tan(HFOV)<

0.47.

28. The photographing optical lens system of claim 17, wherein the fourth lens element or the fifth lens element has the smallest effective radius among the seven lens elements.

29. An imaging apparatus, comprising the photographing optical lens system of claim 17 and an image sensor disposed on the image surface of the photographing optical lens system.

30. An electronic device, comprising at least two imaging apparatuses facing toward the same direction, wherein the at least two imaging apparatuses comprise:

a first imaging apparatus; and

a second imaging apparatus,

wherein the first imaging apparatus comprises;

a first photographing optical lens system as the photographing optical lens system of claim 17; and

an image sensor disposed on the image surface of the first photographing optical lens system,

the second imaging apparatus comprises;

a second photographing optical lens system; and

an image sensor disposed on an image surface of the second photographing optical lens system,

wherein the first imaging apparatus has an angle of view between 25 to 60 degrees, the second imaging apparatus has an angle of view between 60 to 150 degrees.