Imaging lens system

US 20110013069A1
Filed: 01/08/2010
Published: 01/20/2011
Est. Priority Date: 07/14/2009
Status: Active Grant

First Claim

Patent Images

1. An imaging lens system including, in order from an object side to an image side:

a first lens element with positive refractive power having a convex object-side surface;

a second lens element with negative refractive power;

a third lens element having a concave image-side surface;

a fourth lens element with positive refractive power;

a fifth lens element with negative refractive power having a concave image-side surface, at least one surface thereof being provided with at least one inflection point; and

an aperture stop disposed between an imaged object and the third lens element;

wherein an on-axis spacing between the first lens element and the second lens element is T12, a focal length of the imaging lens system is f, and they satisfy the relation;

0.5<

(T12/f)×

100<

15.

View all claims

1 Assignment

Timeline View

Assignment View

0 Petitions

Accused Products

Abstract

This invention provides an imaging lens system including, in order from an object side to an image side: a first lens with positive refractive power having a convex object-side surface; a second lens with negative refractive power; a third lens having a concave image-side surface; a fourth lens with positive refractive power; a fifth lens with negative refractive power having a concave image-side surface, at least one surface thereof having at least one inflection point; and an aperture stop disposed between an imaged object and the third lens. The on-axis spacing between the first lens and second lens is T12, the focal length of the imaging lens system is f, and they satisfy the relation: 0.5<(T12/f)×100<15.

116 Citations

28 Claims

1. An imaging lens system including, in order from an object side to an image side:
- a first lens element with positive refractive power having a convex object-side surface;
  
  a second lens element with negative refractive power;
  
  a third lens element having a concave image-side surface;
  
  a fourth lens element with positive refractive power;
  
  a fifth lens element with negative refractive power having a concave image-side surface, at least one surface thereof being provided with at least one inflection point; and
  
  an aperture stop disposed between an imaged object and the third lens element;
  
  wherein an on-axis spacing between the first lens element and the second lens element is T12, a focal length of the imaging lens system is f, and they satisfy the relation;
  
  0.5<
  
  (T12/f)×
  
  100<
  
  15.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- - 2. The imaging lens system according to claim 1, wherein the second lens element has a concave image-side surface.
  - 3. The imaging lens system according to claim 2, wherein the third lens element has a convex object-side surface while the fourth lens element has a concave object-side surface and a convex image-side surface.
  - 4. The imaging lens system according to claim 3, wherein the third lens element has positive refractive power.
  - 5. The imaging lens system according to claim 2, wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and they satisfy the relation:
    - V1−
      
      V2>
      
      20.
  - 6. The imaging lens system according to claim 5, wherein the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, and they satisfy the relation:
    - V1−
      
      V2>
      
      30.
  - 7. The imaging lens system according to claim 2, wherein the focal length of the imaging lens system is f, a focal length of the first lens element is f1, and they satisfy the relation:
    - 1.0<
      
      f/f1<
      
      1.8.
  - 8. The imaging lens system according to claim 7, wherein the focal length of the imaging lens system is f, the focal length of the first lens element is f1, and they satisfy the relation:
    - 1.2<
      
      f/f1<
      
      1.6.
  - 9. The imaging lens system according to claim 2, wherein the lens elements with refractive power are limited to the first, second, third, fourth and fifth lens elements.
  - 10. The imaging lens system according to claim 9, wherein a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and they satisfy the relation:
    - −
      
      1.5<
      
      f4/f5<
      
      −
      
      0.5.
  - 11. The imaging lens system according to claim 9, wherein, of the third, fourth and fifth lens elements, all lens elements which are meniscus in shape satisfy the relation:
    - 0.5<
      
      R_o/R_i<
      
      2.0, wherein R_orepresents a radius of curvature of an object-side surface of the meniscus lens element and R_irepresents a radius of curvature of an image-side surface of the meniscus lens element.
  - 12. The imaging lens system according to claim 1, wherein a radius of curvature of the object-side surface of the first lens element is R1, the focal length of the imaging lens system is f, and they satisfy the relation:
    - 0.2<
      
      R1/f<
      
      0.4.
  - 13. The imaging lens system according to claim 2, wherein the aperture stop is disposed between the imaged object and the first lens element.
  - 14. The imaging lens system according to claim 9 further comprising an electronic sensor for object imaging, wherein an on-axis spacing between the object-side surface of the first lens element and the electronic sensor is TTL, half of the diagonal length of the effective pixel area of the electronic sensor is ImgH, and they satisfy the relation:
    - TTL/ImgH<
      
      2.0.
  - 15. The imaging lens system according to claim 2, wherein a radius of curvature of the image-side surface of the second lens element is R4, the focal length of the imaging lens system is f, and they satisfy the relation:
    - 0.7<
      
      R4/f<
      
      1.2.
  - 16. The imaging lens system according to claim 1, wherein the Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and they satisfy the relation:
    - |V2−
      
      V3 |<
      
      15.

17. An imaging lens system including, in order from an object side to an image side:
- a first lens element with positive refractive power having a convex object-side surface;
  
  a second lens element with negative refractive power;
  
  a third lens element with negative refractive power;
  
  a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface;
  
  a fifth lens element with negative refractive power having a concave image-side surface, at least one surface thereof being provided with at least one inflection point; and
  
  an aperture stop disposed between an imaged object and the third lens element;
  
  wherein an on-axis spacing between the first lens element and the second lens element is T12, a focal length of the imaging lens system is f, and they satisfy the relation;
  
  0.5<
  
  (T12/f)×
  
  100<
  
  15.
- View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
- - 18. The imaging lens system according to claim 17, wherein the second lens element has a concave image-side surface.
  - 19. The imaging lens system according to claim 18, wherein the third lens element has a convex object-side surface and a concave image-side surface.
  - 20. The imaging lens system according to claim 18, wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and they satisfy the relation:
    - V1−
      
      V2>
      
      30.
  - 21. The imaging lens system according to claim 18, wherein the focal length of the imaging lens system is f, a focal length of the first lens element is f1, and they satisfy the relation:
    - 1.0<
      
      f/f1<
      
      1.8.
  - 22. The imaging lens system according to claim 21, wherein the focal length of the imaging lens system is f, the focal length of the first lens element is f1, and they satisfy the relation:
    - 1.2<
      
      f/f1<
      
      1.6.
  - 23. The imaging lens system according to claim 18, wherein the lens elements with refractive power are limited to the first, second, third, fourth and fifth lens elements.
  - 24. The imaging lens system according to claim 23, wherein a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and they satisfy the relation:
    - −
      
      1.5<
      
      f4/f5<
      
      −
      
      0.5.
  - 25. The imaging lens system according to claim 23, wherein, of the third, fourth and fifth lens elements, all lens elements which are meniscus in shape satisfy the relation:
    - 0.5<
      
      R_o/R_i<
      
      2.0, wherein R_orepresents a radius of curvature of an object-side surface of the meniscus lens element and R_irepresents a radius of curvature of an image-side surface of the meniscus lens element.
  - 26. The imaging lens system according to claim 17, wherein a radius of curvature of the object-side surface of the first lens element is R1, the focal length of the imaging lens system is f, and they satisfy the relation:
    - 0.2<
      
      R1/f<
      
      0.4.
  - 27. The imaging lens system according to claim 18, wherein the aperture stop is disposed between the imaged object and the first lens element.
  - 28. The imaging lens system according to claim 23 further comprising an electronic sensor for object imaging, wherein an on-axis spacing between the object-side surface of the first lens element and the electronic sensor is TTL, half of the diagonal length of the effective pixel area of the electronic sensor is ImgH, and they satisfy the relation:
    - TTL/ImgH<
      
      2.0.

Specification

Resources

Litigation Campaign Assessment

Current Assignee
Largan Precision Co Limited (Largan Precision)
Original Assignee
Largan Precision Co Limited (Largan Precision)
Inventors
Chen, Chun-Shan

Granted Patent

US 8,233,224 B2
Time in Patent Office

Days
Field of Search
US Class Current

348/335
CPC Class Codes

G02B 13/0045   having five or more lenses

G02B 13/18   with lenses having one or m...

G02B 27/0025   for optical correction, e.g...

G02B 3/04   with continuous faces that ...

G02B 9/60   having five components only

H04N 23/00   Cameras or camera modules c...

H04N 23/54   Mounting of pick-up tubes, ...

Imaging lens system

First Claim

1 Assignment

0 Petitions

Accused Products

Abstract

116 Citations

28 Claims

Specification

Solutions

Use Cases

Quick Links

Imaging lens system

First Claim

1 Assignment

Subscription Required

Subscription Required

0 Petitions

Subscription Required

Accused Products

Subscription Required

Abstract

116 Citations

28 Claims

Specification

Subscription Required

Solutions

Use Cases

Quick Links