USRE45765EActiveUtility
Image pickup optical lens assembly

Assignee: LARGAN PRECISION CO LTDPriority: Jan 7, 2011Filed: May 5, 2014Granted: Oct 20, 2015
Est. expiryJan 7, 2031(~4.4 yrs left)· nominal 20-yr term from priority
Inventors:Hsiang-Chi Tang Hsin-Hsuan Huang
G02B 13/0045G02B 27/0025G02B 5/005G02B 9/60
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Claims
Abstract

An image pickup optical lens assembly, sequentially arranged from an object side to an image side along an optical axis, comprising: the first lens element with positive refractive power having a convex object-side surface, the second lens element with negative refractive power, the third lens element with refractive power, the fourth lens element with positive or negative refractive power having a concave object-side surface and a convex image-side surface with both being aspheric, and the fifth lens element with positive or negative refractive power having a convex object-side surface and a concave image-side surface with both being aspheric. Additionally, the image pickup optical lens assembly satisfies conditions related to the reduction of the total length and the sensitivity of the image pickup optical lens assembly for compact cameras and mobile phones with camera functionalities.
Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. An image pickup optical lens assembly, sequentially arranged from an object side to an image side, comprising:
 a first lens element with positive refractive power, having a convex object-side surface; 
 a second lens element with negative refractive power, having a convex object-side surface and a concave image-side surface; 
 a third lens element with refractive power; 
 a fourth lens element with negative refractive power, having a concave object-side surface and a convex image-side surface, both object-side surface and image-side surface thereof being aspheric; and 
 a fifth lens element with refractive power, having a convex object-side surface and a concave image-side surface, both object-side surface and image-side surface thereof being aspheric, and at least one of the object-side surface and the image-side surface of the fifth element having at least one inflection point; 
 wherein the image pickup optical lens assembly has a total of five lens elements with refractive power, T 12  is an axial distance between the first lens element and the second lens element, T 23  is an axial distance between the second lens element and the third lens element, CT 4  is a thickness of the fourth lens element near the optical axis, CT 5  is a thickness of the fifth lens element near the optical axis, f is a focal length of the image pickup optical lens assembly, f 1  is a focal length of the first lens element, and the following relations are satisfied:
   0.3&lt;T 12 /T 23 &lt;1.8; 
   0.2&lt;CT 4 /CT 5 &lt;0.9; 
   0.85&lt;f/f 1 &lt;1.55. 
 
 
     
     
       2. The image pickup optical lens assembly of  claim 1 , wherein at least one of the object-side surface and the image-side surface of the second lens element is aspheric; and at least one of the an object-side surface and the an image-side surface of the third lens element is aspheric; and at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point. 
     
     
       3. The image pickup optical lens assembly of claim  2  1, wherein Sd is an axial distance from the a stop to the image-side surface of the fifth lens element, Td is an axial distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element, and the following relation is satisfied:
   0.75&lt;Sd/Td&lt;1.2. 
 
     
     
       4. The image pickup optical lens assembly of claim  3  1, further comprising an image sensor at an image plane, wherein TTL is an axial distance from the object-side surface of the first lens element to the image plane, ImgH is half of the diagonal length of an effective photosensitive area of the image sensor, and the following relation is satisfied:
   TTL/ImgH&lt;2.3. 
 
     
     
       5. The image pickup optical lens assembly of claim  3  1, wherein the third lens element has positive refractive power, and the fifth lens element is made of plastic. 
     
     
       6. The image pickup optical lens assembly of  claim 5 , wherein f is the focal length of the image pickup optical lens assembly, and f 1  is the focal length of the first lens element, and the following relation is satisfied:
   0.95&lt;f/f 1 &lt;1.40.   
     
     
       7. The image pickup optical lens assembly of claim  5  1, wherein CT 4  is the thickness of the fourth lens element near the optical axis, CT 5  is the thickness of the fifth lens element near the optical axis, and the following relation is preferably satisfied:
   0.30.2&lt;CT 4 /CT 5 &lt;0.7. 
 
     
     
       8. The image pickup optical lens assembly of claim  7  1, wherein the fourth lens element has positive refractive power, and the fifth lens element has negative refractive power. 
     
     
       9. The image pickup optical lens assembly of claim  7  1, wherein CT 4  is the thickness of the fourth lens element near the optical axis, CT 5  is the thickness of the fifth lens element near the optical axis, and the following relation is preferably satisfied:
   0.350.2&lt;CT 4 /CT 5 &lt;0.55. 
 
     
     
       10. The image pickup optical lens assembly of  claim 3 , wherein T 12  is the axial distance between the first lens element and the second lens element, T 23  is the axial distance between the second lens element and the third lens element, and the following relation is preferably satisfied:
   0.39&lt;T 12 /T 23 &lt;1.25.   
     
     
       11. The image pickup optical lens assembly of claim  10  1, wherein v 1  is the Abbe number of the first lens element, v 2  is the Abbe number of the second lens element, and the following relation is satisfied:
   28&lt;v 1 −v 2 &lt;42.
 
 
     
     
       12. The image pickup optical lens assembly of claim  11  1, wherein f is the focal length of the image pickup optical lens assembly, f 4  is a focal length of the fourth lens element, f 5  is a focal length of the fifth lens element, and the following relation is satisfied:
   |f/f 4 |+|f/f 5 |&lt; 0 . 6 1.8. 
 
     
     
       13. The image pickup optical lens assembly of claim  10  1, wherein R 1  is a curvature radius of the object-side surface of the first lens element, R 2  is a curvature radius of the an image-side surface of the first lens element, and the following relation is satisfied:
   −0.8&lt;(R 1 +R 2 )/(R 1 −R 2 )&lt;−0.2.
 
 
     
     
       14. The image pickup optical lens assembly of claim  10  1, wherein Td is the an axial distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element, Sd is the an axial distance from the a stop to the image-side surface of the fifth lens element, and the following relation is preferably satisfied:
   0.9&lt;Sd/Td&lt;1.1. 
 
     
     
       15. An image pickup optical lens assembly, sequentially arranged from an object side to an image side, comprising:
 a first lens element with positive refractive power, having a convex object-side surface; 
 a second lens element with negative refractive power, and at least one of an object-side surface and an image-side surface of the second lens element being aspheric; 
 a third lens element with positive refractive power, having a convex image-side surface; 
 a fourth lens element with refractive power, having a concave object-side surface and a convex image-side surface, both object-side surface and image-side surface thereof being aspheric; and 
 a fifth lens element with refractive power, having a convex object-side surface and a concave image-side surface, both object-side surface and image-side surface thereof being aspheric, at least one of the object-side surface and the image-side surface of the fifth element having at least one inflection point, and the fifth lens element is made of plastic; 
 wherein the image pickup optical lens assembly has a total of five lens elements with refractive power, and a gap on the optical axis is formed between any two adjacent lens elements among the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element; the image pickup optical lens assembly further comprises a stop between an object and the first lens element, T 12  is an axial distance between the first lens element and the second lens element, T 23  is an axial distance between the second lens element and the third lens element, CT 4  is a thickness of the fourth lens element near the optical axis, T 45  is an axial distance between the fourth lens element and the fifth lens element, CT 5  is a thickness of the fifth lens element near the optical axis, f is a focal length of the image pickup optical lens assembly, f 4  is a focal length of the fourth lens element, f 5  is a focal length of the fifth lens element, Td is an axial distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element, Sd is an axial distance from the stop to the image-side surface of the fifth lens element, and the following relations are satisfied:
   0.3&lt;T 12 /T 23 &lt;1.8; 
   0.3&lt;(CT 4 +T 45 )/CT 5 &lt;0.7; 
   |f/f 4 |+|f/f 5 |&lt;1.8; 
   0.9&lt;Sd/Td&lt;1.1. 
 
 
     
     
       16. The image pickup optical lens assembly of  claim 15 , wherein at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point, and the fifth lens element is made of plastic. 
     
     
       17. The image pickup optical lens assembly of claim  16  15, wherein f is the focal length of the image pickup optical lens assembly, f 1  is a focal length of the first lens element, the following relation is satisfied:
   0.85&lt;f/f 1 &lt;1.55. 
 
     
     
       18. The image pickup optical lens assembly of claim  16  15, wherein CT 4  is the thickness of the fourth lens element near the optical axis, CT 5  is the thickness of the fifth lens element near the optical axis, and the following relation is satisfied:
   0.350.2&lt;CT 4 /CT 5 &lt;0.55. 
 
     
     
       19. The image pickup optical lens assembly of claim  16  15, wherein f is the focal length of the image pickup optical lens assembly, f 4  is the focal length of the fourth lens element, f 5  is the focal length of the fifth lens element, and the following relation is preferably satisfied:
   |f/f 4 |+|f/f 5 |&lt;0.6. 
 
     
     
       20. The image pickup optical lens assembly of claim  16  15, wherein R 1  is a curvature radius of the object-side surface of the first lens element, R 2  is a curvature radius of the an image-side surface of the first lens element, and the following relation is preferably satisfied:
   −0.8&lt;(R 1 +R 2 )/(R 1 −R 2 )&lt;−0.2.
 
 
     
     
       21. The image pickup optical lens assembly of claim  16  15, wherein the fourth lens element has positive refractive power, and the fifth lens element has negative refractive power. 
     
     
       22. The image pickup optical lens assembly of  claim 21 , wherein T 12  is the axial distance between the first lens element and the second lens element, T 23  is the axial distance between the second lens element and the third lens element, and the following relation is preferably satisfied:
   0.39&lt;T 12 /T 23 &lt;1.25.   
     
     
       23. The image pickup optical lens assembly of claim  21  15, wherein f is the focal length of the image pickup optical lens assembly, f 1  is a focal length of the first lens element, and the following relation is satisfied:
   0.95&lt;f/f 1 &lt;1.40. 
 
     
     
       24. The image pickup optical lens assembly of claim 15, wherein the fourth lens element has negative refractive power.  
     
     
       25. The image pickup optical lens assembly of claim 15, wherein v 1  is the Abbe number of the first lens element, v 2  is the Abbe number of the second lens element, and the following relation is satisfied:
   28&lt;v 1 −v 2 &lt;42. 
   
     
     
       26. An image pickup optical lens assembly, sequentially arranged from an object side to an image side, comprising:
 a first lens element with positive refractive power, having a convex object-side surface;   a second lens element with negative refractive power, having a convex object-side surface and a concave image-side surface;   a third lens element with positive refractive power;   a fourth lens element with negative refractive power, having a concave object-side surface and a convex image-side surface, both object-side surface and image-side surface thereof being aspheric; and   a fifth lens element with refractive power, having an object-side surface and a concave image-side surface, both object-side surface and image-side surface thereof being aspheric, and the image-side surface of the fifth element having at least one inflection point;   wherein the image pickup optical lens assembly has a total of five lens elements with refractive power, the image pickup optical lens assembly further comprises a stop between an object and the first lens element; CT 4  is a thickness of the fourth lens element near the optical axis, CT 5  is a thickness of the fifth lens element near the optical axis, Sd is an axial distance from the stop to the image-side surface of the fifth lens element, Td is an axial distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element, and the following relations are satisfied:
   0.2&lt;CT 4 /CT 5 &lt;0.9; 
   0.9&lt;Sd/Td&lt;1.1.  
   
     
     
       27. The image pickup optical lens assembly of claim 26, wherein the third lens element comprises a convex image-side surface.  
     
     
       28. The image pickup optical lens assembly of claim 26, wherein the object-side surface of the fifth lens element is convex.  
     
     
       29. The image pickup optical lens assembly of claim 26, wherein the fifth lens element has negative refractive power.  
     
     
       30. The image pickup optical lens assembly of claim 26, wherein CT 4  is the thickness of the fourth lens element near the optical axis, CT 5  is the thickness of the fifth lens element near the optical axis, T 45  is the axial distance between the fourth lens element and the fifth lens element, and the following relation is satisfied:
   0.3&lt;(CT 4 +T 45 )/CT 5 &lt;0.7.    
     
     
       31. The image pickup optical lens assembly of claim 26, wherein f is the focal length of the image pickup optical lens assembly, f 4  is a focal length of the fourth lens element, f 5  is a focal length of the fifth lens element, and the following relation is satisfied:
   |f/f 4 |+|f/f 5 |&lt;1.8.    
     
     
       32. The image pickup optical lens assembly of claim 26, wherein v 1  is the Abbe number of the first lens element, v 2  is the Abbe number of the second lens element, and the following relation is satisfied:
   28&lt;v 1 −v 2 &lt;42. 
   
     
     
       33. The image pickup optical lens assembly of claim 26, further comprising an image sensor at an image plane, wherein TTL is an axial distance from the object-side surface of the first lens element to the image plane, ImgH is half of the diagonal length of an effective photosensitive area of the image sensor, and the following relation is satisfied:
   TTL/ImgH&lt;1.75.    
     
     
       34. An image pickup optical lens assembly, sequentially arranged from an object side to an image side, comprising:
 a first lens element with positive refractive power, having a convex object-side surface;   a second lens element with negative refractive power, and at least one of an object-side surface and an image-side surface of the second lens element being aspheric;   a third lens element with positive refractive power;   a fourth lens element with negative refractive power, having a concave object-side surface and a convex image-side surface, both object-side surface and image-side surface thereof being aspheric; and   a fifth lens element with refractive power, having a concave image-side surface, both object-side surface and image-side surface thereof being aspheric, and the image-side surface of the fifth lens element having at least one inflection point;   wherein the image pickup optical lens assembly has a total of five lens elements with refractive power, a gap on the optical axis is formed between any two adjacent lens elements among the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element; the image pickup optical lens assembly further comprises a stop between an object and the first lens element, f is a focal length of the image pickup optical lens assembly, f 1  is a focal length of the first lens element, Td is an axial distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element, Sd is an axial distance from the stop to the image-side surface of the fifth lens element, and the following relations are satisfied:
   0.85&lt;f/f 1 &lt;1.55; 
   0.9&lt;Sd/Td&lt;1.1.  
   
     
     
       35. The image pickup optical lens assembly of claim 34, wherein the third lens element comprises a convex image-side surface.  
     
     
       36. The image pickup optical lens assembly of claim 34, wherein the object-side surface of the fifth lens element is convex.  
     
     
       37. The image pickup optical lens assembly of claim 34, wherein the fifth lens element has negative refractive power.  
     
     
       38. The image pickup optical lens assembly of claim 34, wherein the object-side surface of the second lens element is convex and the image-side surface of the second lens element is concave.  
     
     
       39. The image pickup optical lens assembly of claim 34, wherein v 1  is the Abbe number of the first lens element, v 2  is the Abbe number of the second lens element, and the following relation is satisfied:
   28&lt;v 1 −v 2 &lt;42. 
   
     
     
       40. The image pickup optical lens assembly of claim 34, wherein f is the focal length of the image pickup optical lens assembly, f 1  is a focal length of the first lens element, and the following relation is satisfied:
   0.85&lt;f/f 1 &lt;1.40.    
     
     
       41. The image pickup optical lens assembly of claim 34, wherein CT 4  is a thickness of the fourth lens element near the optical axis, CT 5  is a thickness of the fifth lens element near the optical axis, and the following relation is satisfied:
   0.2&lt;CT 4 /CT 5 &lt;0.9.    
     
     
       42. The image pickup optical lens assembly of claim 34, wherein CT 4  is a thickness of the fourth lens element near the optical axis, CT 5  is a thickness of the fifth lens element near the optical axis, and the following relation is satisfied:
   0.2&lt;CT 4 /CT 5 &lt;0.55.    
     
     
       43. The image pickup optical lens assembly of claim 34, wherein CT 4  is a thickness of the fourth lens element near the optical axis, CT 5  is a thickness of the fifth lens element near the optical axis, T 45  is an axial distance between the fourth lens element and the fifth lens element, and the following relation is satisfied:
   0.3&lt;(CT 4 +T 45 )/CT 5 &lt;0.7.    
     
     
       44. The image pickup optical lens assembly of claim 34, wherein f is the focal length of the image pickup optical lens assembly, f 4  is a focal length of the fourth lens element, f 5  is a focal length of the fifth lens element, and the following relation is satisfied:
   |f/f 4 |+|f/f 5 |&lt;1.8.    
     
     
       45. The image pickup optical lens assembly of claim 34, wherein f is the focal length of the image pickup optical lens assembly, f 4  is a focal length of the fourth lens element, f 5  is a focal length of the fifth lens element, and the following relation is satisfied:
   |f/f 4 |+|f/f 5 |&lt;0.6.    
     
     
       46. The image pickup optical lens assembly of claim 34, further comprising an image sensor at an image plane, wherein TTL is an axial distance from the object-side surface of the first lens element to the image plane, ImgH is half of the diagonal length of an effective photosensitive area of the image sensor, and the following relation is satisfied:
   TTL/ImgH≦1.75.
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