Optical Lens System for Taking Image

US 20100134904A1
Filed: 02/22/2009
Published: 06/03/2010
Est. Priority Date: 12/01/2008
Status: Active Grant

First Claim

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1. An optical lens system for taking image comprising, in order from the object side to the 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 positive refractive power having a concave object-side surface and a convex image-side surface;

a fourth lens element with positive refractive power;

a fifth lens element with refractive power; and

an aperture stop being located between an object to be photographed and the second lens element;

in the optical lens system for taking image, the number of the lens elements with refractive power being limited to five.

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Abstract

An optical lens system for taking image comprises, in order from the object side to the 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 positive refractive power having a concave object-side surface and a convex image-side surface; a fourth lens element with positive refractive power; a fifth lens element with refractive power; and an aperture stop located between an object to be photographed and the second lens element. In the optical lens system for taking image, the number of the lens elements with refractive power being limited to five. Such lens arrangements can effectively reduce the volume of the optical lens system, reduce the sensitivity of the optical lens system and obtain higher resolution.

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27 Claims

1. An optical lens system for taking image comprising, in order from the object side to the 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 positive refractive power having a concave object-side surface and a convex image-side surface;
  
  a fourth lens element with positive refractive power;
  
  a fifth lens element with refractive power; and
  
  an aperture stop being located between an object to be photographed and the second lens element;
  
  in the optical lens system for taking image, the number of the lens elements with refractive power being limited to five.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- - 2. The optical lens system for taking image as claimed in claim 1, wherein an image-side surface of the fifth lens element is concave.
  - 3. The optical lens system for taking image as claimed in claim 2, wherein an object-side surface of the fifth lens element is convex.
  - 4. The optical lens system for taking image as claimed in claim 3, wherein an image-side surface of the second lens element is concave.
  - 5. The optical lens system for taking image as claimed in claim 4, wherein the fifth lens element is made of plastic material and is formed with inflection points.
  - 6. The optical lens system for taking image as claimed in claim 5, wherein the fourth lens element is made of plastic material and is formed with inflection points.
  - 7. The optical lens system for taking image as claimed in claim 5, wherein an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is concave.
  - 8. The optical lens system for taking image as claimed in claim 7, wherein the aperture stop is located before the first lens element.
  - 9. The optical lens system for taking image as claimed in claim 8, wherein the fourth lens element is made of plastic material, at least one of the object-side and the image-side surfaces of the fourth lens element is aspheric, an Abbe number of the fourth lens element is V4, it satisfies the relation:
    - 40<
      
      V4<
      
      70,and the object-side surface and the image-side surface of the fifth lens element are aspheric.
  - 10. The optical lens system for taking image as claimed in claim 9, wherein the second lens element is made of plastic material, at least one of an object-side and the image-side surfaces of the second lens element is aspheric, the third lens element is made of plastic material, and at least one of the object-side and the image-side surfaces of the third lens element is aspheric.
  - 11. The optical lens system for taking image as claimed in claim 10, wherein the first lens element is made of plastic material, at least one of the object-side and an image-side surfaces of the first lens element is aspheric, an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and they satisfy the relations:
    - V1−
      
      V2>
      
      15;
      
      V3−
      
      V2>
      
      15.
  - 12. The optical lens system for taking image as claimed in claim 8, wherein a focal length of the optical lens system for taking image is f, a focal length of the first lens element is f1, a focal length of the fourth lens element is f4, and they satisfy the relations:
    - 1.1<
      
      f/f1<
      
      2.0;
      
      0<
      
      f/f4<
      
      0.8.
  - 13. The optical lens system for taking image as claimed in claim 12, wherein the focal length of the optical lens system for taking image is f, a focal length of the second lens element is f2, and they satisfy the relation:
    - −
      
      2.5<
      
      f/f2<
      
      −
      
      0.7.
  - 14. The optical lens system for taking image as claimed in claim 13, wherein the focal length of the optical lens system for taking image is f, a focal length of the fifth lens element is f5, and they satisfy the relation:
    - −
      
      2.0<
      
      f/f5<
      
      −
      
      0.75.
  - 15. The optical lens system for taking image as claimed in claim 14, wherein the focal length of the optical lens system for taking image is f, the focal length of the fourth lens element is f4, and they satisfy the relation:
    - 0.0<
      
      f/f4<
      
      0.3.
  - 16. The optical lens system for taking image as claimed in claim 8, wherein a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of an image-side surface of the first lens element is R2, and they satisfy the relation:
    - R1/R2>
      
      −
      
      0.22.
  - 17. The optical lens system for taking image as claimed in claim 16, wherein a radius of curvature of the object-side surface of the fourth lens element is R7, a radius of curvature of the image-side surface of the fourth lens element is R8, and they satisfy the relation:
    - 0<
      
      R7/R8<
      
      1.6.
  - 18. The optical lens system for taking image as claimed in claim 1, wherein an on-axis distance between the first lens element and the second lens element is T12, a focal length of the optical lens system for taking image is f, and they satisfy the relation:
    - 0.4<
      
      (T12/f)*100<
      
      15.
  - 19. The optical lens system for taking image as claimed in claim 7, wherein an image-side surface of the first lens element is concave.
  - 20. The optical lens system for taking image as claimed in claim 1, wherein an object-side surface of the second lens element is convex.
  - 21. The optical lens system for taking image as claimed in claim 8, wherein an Abbe number of the first lens element is V1, and it satisfies the relations:
    - 50<
      
      V1<
      
      58.
  - 22. The optical lens system for taking image as claimed in claim 8, wherein an edge thickness of the fourth lens element is ET4, a center thickness of the fourth lens element is CT4, and they satisfy the relation:
    - 0.6<
      
      ET4/CT4<
      
      1.0.
  - 23. The optical lens system for taking image as claimed in claim 12, wherein the focal length of the optical lens system for taking image is f, the focal length of the first lens element is f1, a focal length of the third lens element is f3, the focal length of the fourth lens element is f4, and they satisfy the relations:
    - 1.1<
      
      f/f1<
      
      1.4;
      
      0.6<
      
      f/f3<
      
      0.8;
      
      0.03<
      
      f/f4<
      
      0.2.
  - 24. The optical lens system for taking image as claimed in claim 17, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of an image-side surface of the first lens element is R2, and they satisfy the relation:
    - −
      
      0.2<
      
      R1/R2<
      
      0.3.
  - 25. The optical lens system for taking image as claimed in claim 24, wherein a radius of curvature of the object-side surface of the fifth lens element is R9, a radius of curvature of the image-side surface of the fifth lens element is R10, and they satisfy the relation:
    - 2.0<
      
      R9/R10<
      
      4.0.
  - 26. The optical lens system for taking image as claimed in claim 1, wherein the object to be photographed is imaged on an electronic imaging sensor, a total track length of the optical lens system for taking image is TTL, a maximum image height of the optical lens system for taking image is ImgH, and they satisfy the relation:
    - TTL/ImgH<
      
      2.05.
  - 27. The optical lens system for taking image as claimed in claim 1, wherein the fifth lens element has negative refractive power, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, and they satisfy the relation:
    - |V4−
      
      V5″
      
      <
      
      15.

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Current Assignee
Largan Precision Co Limited (Largan Precision)
Original Assignee
Largan Precision Co Limited (Largan Precision)
Inventors
TSAI, Tsung-Han

Granted Patent

US 7,826,151 B2
Time in Patent Office

Days
Field of Search
US Class Current

359/764
CPC Class Codes

G02B 13/0045   having five or more lenses

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

G02B 9/60   having five components only

Optical Lens System for Taking Image

First Claim

1 Assignment

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Abstract

69 Citations

27 Claims

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Optical Lens System for Taking Image

First Claim

1 Assignment

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0 Petitions

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Accused Products

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Abstract

69 Citations

27 Claims

Specification

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Solutions

Use Cases

Quick Links