USRE47027EActiveUtility

Imaging lens

56
Assignee: KANTATSU CO LTDPriority: Mar 30, 2011Filed: Sep 9, 2015Granted: Sep 4, 2018
Est. expiryMar 30, 2031(~4.7 yrs left)· nominal 20-yr term from priority
Inventors:Masaya Hashimoto
G02B 13/0045
56
PatentIndex Score
0
Cited by
17
References
26
Claims

Abstract

An imaging lens includes: an aperture stop; a biconvex first lens directing convex surfaces toward an object and an image; a second lens directing a convex surface toward the object near the optical axis and having negative refractive power; a biconvex third lens directing convex surfaces toward the object and the image near the optical axis; a fourth lens directing a concave surface toward the object near the optical axis and having positive refractive power; and a fifth lens directing a convex surface toward the object near the optical axis and having negative refractive power. The aperture stop and the first to fifth lenses are arranged in this order from the object side, and a conditional expression 1 being 0.50<f 1 /f<0.76 is satisfied, where f 1 represents the focal length of the first lens and f represents the focal length of the entire imaging lens.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. An imaging lens for use in solid-state image sensors, comprising:
 an aperture stop; 
 a biconvex first lens directing convex surfaces toward an object side and an image side; 
 a second lens directing a convex surface toward the object side near an optical axis and having negative refractive power; 
 a biconvex third lens directing convex surfaces toward the object side and the image side near the optical axis, and having two aspheric surfaces; 
 a fourth lens directing a concave surface toward the object side near the optical axis and having positive refractive power; and 
 a fifth lens directing a convex surface toward the object side near the optical axis and having negative refractive power, wherein 
 the aperture stop and the first to fifth lenses are arranged in this order from the object side of the imaging lens toward an image surface thereof, and 
 a conditional expression 1 is satisfied, the conditional expression 1 being 0.50<f 1 /f<0.76 where f 1  represents the focal length of the first lens and f represents the focal length of the entire imaging lens. 
 
     
     
       2. The An imaging lens according to  claim 1 , wherein for use in solid-state image sensors, comprising:
 an aperture stop; 
 a biconvex first lens directing convex surfaces toward an object side and an image side; 
 a second lens directing a convex surface toward the object side near an optical axis and having negative refractive power; 
 a biconvex third lens directing convex surfaces toward the object side and the image side near the optical axis; 
 a fourth lens directing a concave surface toward the object side near the optical axis and having positive refractive power; and 
 a fifth lens directing a convex surface toward the object side near the optical axis and having negative refractive power, wherein 
 the aperture stop and the first to fifth lenses are arranged in this order from the object side of the imaging lens toward an image surface thereof, 
 a conditional expression 1 is satisfied, the conditional expression 1 being 0.50<f1/f<0.76 where f1 represents the focal length of the first lens and f represents the focal length of the entire imaging lens; and 
 a conditional expression 2 is satisfied, the conditional expression 2 being −0.80<(r 5 +r 6 )/(r 5 −r 6 )<0.55 where r 5  represents the curvature radius of the object side surface of the third lens and r 6  represents the curvature radius of the image side surface thereof. 
 
     
     
       3. The imaging lens according to  claim 2 , wherein
 a conditional expression 4 is satisfied, the conditional expression 4 being 1.20<f 12 /f<1.95 where f 12  represents the composite focal length of the first and second lenses and f represents the focal length of the entire imaging lens. 
 
     
     
       4. The imaging lens according to  claim 3 , wherein
 a conditional expression 5 is satisfied, the conditional expression 5 being 1.50<f 345 /f<9.00 where f 345  represents the composite focal length of the third to fifth lenses and f represents the focal length of the entire imaging lens. 
 
     
     
       5. The imaging lens according to  claim 1 , wherein
 a conditional expression 3 is satisfied, the conditional expression 3 being 8.5<r 9 /r 10 <85.0 where r 9  represents the curvature radius of the object side surface of the fifth lens and r 10  represents the curvature radius of the image side surface thereof. 
 
     
     
       6. The imaging lens according to  claim 5 , wherein
 a conditional expression 4 is satisfied, the conditional expression 4 being 1.20<f 12 /f<1.95 where f 12  represents the composite focal length of the first and second lenses and f represents the focal length of the entire imaging lens. 
 
     
     
       7. The imaging lens according to  claim 6 , wherein
 a conditional expression 5 is satisfied, the conditional expression 5 being 1.50<f 345 /f<9.00 where f 345  represents the composite focal length of the third to fifth lenses and f represents the focal length of the entire imaging lens. 
 
     
     
       8. The imaging lens according to  claim 1 , wherein
 a conditional expression 4 is satisfied, the conditional expression 4 being 1.20<f 12 /f<1.95 where f 12  represents the composite focal length of the first and second lenses and f represents the focal length of the entire imaging lens. 
 
     
     
       9. The imaging lens according to  claim 8 , wherein
 a conditional expression 5 is satisfied, the conditional expression 5 being 1.50<f 345 /f<9.00 where f 345  represents the composite focal length of the third to fifth lenses and f represents the focal length of the entire imaging lens. 
 
     
     
       10. The imaging lens according to  claim 1 , wherein
 conditional expressions 6 and 7 are satisfied, the conditional expressions 6 and 7 being 2.10<f 3 /f 1 <8.50 and 0.65<f 4 /f 1 <1.40 where f 1  represents the focal length of the first lens; f 3  represents the focal length of the third lens; and f 4  represents the focal length of the fourth lens. 
 
     
     
       11. The imaging lens according to  claim 1 , wherein
 conditional expressions 8 and 9 are satisfied, the conditional expressions 8 and 9 being 3.10<r 3 /r 4 <6.80 and −1.40<f 2 /f<−0.70 are satisfied where r 3  represents the curvature radius of the object side surface of the second lens; r 4  represents the curvature radius of the image side surface thereof; f 2  represents the focal length thereof; and f represents the focal length of the entire imaging lens. 
 
     
     
       12. The imaging lens according to  claim 1 , wherein
 a conditional expression 10 is satisfied, the conditional expression 10 being 2.0≤f/EPD≤2.8 where EPD represents the diameter of the aperture stop and f represents the focal length of the entire imaging lens. 
 
     
     
       13. An imaging lens for use in solid-state image sensors, comprising:
 an aperture stop;   a first lens directing a convex surface toward an object side and having positive refractive power;   a second lens having negative refractive power;   a biconvex third lens directing convex surfaces toward the object side and an image side near an optical axis, and having two aspheric surfaces;   a meniscus-shaped fourth lens directing a concave surface toward the object side near the optical axis and, having two aspheric surfaces; and   a fifth lens directing a convex surface toward the object side near the optical axis and having two aspheric surfaces, wherein   the aperture stop and the first to fifth lenses are arranged in this order from the object side of the imaging lens toward an image surface thereof, and   a conditional expression 10a is satisfied, the conditional expression 10a being 2.0≤f/EPD≤2.6 where EPD represents the diameter of the aperture stop and f represents the focal length of the entire imaging lens.   
     
     
       14. An imaging lens according to claim 13, wherein
 the first lens is a biconvex lens which directs convex surfaces toward the object side and the image side, the second lens directs a convex surface toward the object side, the third lens has positive refractive power, and the fifth lens has negative refractive power.   
     
     
       15. An imaging lens according to claim 13, wherein
 a conditional expression 1 is satisfied, the conditional expression 1 being 0.50<f1/f<0.76 where f1 represents the focal length of the first lens and f represents the focal length of the entire imaging lens.   
     
     
       16. The imaging lens according to claim 13, wherein
 a conditional expression 4 is satisfied, the conditional expression 4 being 1.20<f12/f<1.95 where f12 represents the composite focal length of the first and second lenses and f represents the focal length of the entire imaging lens.   
     
     
       17. The imaging lens according to claim 13, wherein
 a conditional expression 5 is satisfied, the conditional expression 5 being 1.50<f345/f<9.00 where f345 represents the composite focal length of the third to fifth lenses and f represents the focal length of the entire imaging lens.   
     
     
       18. The imaging lens according to claim 13, wherein
 conditional expressions 6 and 7 are satisfied, the conditional expressions 6 and 7 being 2.10<f3/f1<8.50 and 0.65<f4/f1<1.40 where f1 represents the focal length of the first lens; f3 represents the focal length of the third lens; and f4 represents the focal length of the fourth lens.   
     
     
       19. The imaging lens according to claim 13, wherein
 conditional expressions 8 and 9 are satisfied, the conditional expressions 8 and 9 being 3.10<r3/r4<6.80 and −1.40<f2/f<−0.70 are satisfied where r3 represents the curvature radius of the object side surface of the second lens; r4 represents the curvature radius of the image side surface thereof; f2 represents the focal length thereof; and f represents the focal length of the entire imaging lens.   
     
     
       20. An imaging lens for use in solid-state image sensors, comprising:
 a biconvex first lens directing convex surfaces toward an object side and an image side;   a second lens directing a convex surface toward the object side near an optical axis and having negative refractive power;   a third lens directing a convex surface toward the object side near the optical axis, having two aspheric surfaces, and having positive refractive power;   a fourth lens directing a concave surface toward the object side near the optical axis and having positive refractive power; and   a fifth lens directing a convex surface toward the object side near the optical axis and having negative refractive power, wherein   the first to fifth lenses are arranged in this order from the object side of the imaging lens toward an image surface thereof,   a conditional expression 4 is satisfied, the conditional expression 4 being 1.20<f12/f<1.95 where f12 represents the composite focal length of the first and second lenses and f represents the focal length of the entire imaging lens, and   a conditional expression 8 is satisfied, the conditional expression 8 being 3.10<r3/r4<6.80 where r3 represents the curvature radius of the object side surface of the second lens and r4 represents the curvature radius of the image side surface thereof.   
     
     
       21. The imaging lens according to claim 20, wherein
 said third lens has a positive refractive power.   
     
     
       22. An imaging lens according to claim 20, wherein
 a conditional expression 1 is satisfied, the conditional expression 1 being 0.50<f1/f<0.76 where f1 represents the focal length of the first lens and f represents the focal length of the entire imaging lens.   
     
     
       23. The imaging lens according to claim 20, wherein
 a conditional expression 5 is satisfied, the conditional expression 5 being 1.50<f345/f<9.00 where f345 represents the composite focal length of the third to fifth lenses and f represents the focal length of the entire imaging lens.   
     
     
       24. The imaging lens according to claim 20, wherein
 conditional expressions 6 and 7 are satisfied, the conditional expressions 6 and 7 being 2.10<f3/f1<8.50 and 0.65<f4/f1<1.40 where f1 represents the focal length of the first lens; f3 represents the focal length of the third lens; and f4 represents the focal length of the fourth lens.   
     
     
       25. The imaging lens according to claim 20, wherein
 a conditional expression 9 is satisfied, the conditional expression 9 being −1.40<f2/f<−0.70 where f2 represents the focal length of the second lens and f represents the focal length of the entire imaging lens.   
     
     
       26. The imaging lens according to claim 20, wherein
 the aperture stop is disposed on the object side of the first lens, and a conditional expression 10 is satisfied, the conditional expression 10 being 2.0≤f/EPD≤2.8 where EPD represents the diameter of the aperture stop and f represents the focal length of the entire imaging lens.

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