Imaging lens
Disclosed herein is an imaging lens including: a first lens having positive (+) power; a second lens having positive (+) power; a third lens having positive (+) or negative (−) power; a fourth lens having positive (+) or negative (−) power; a fifth lens having positive (+) or negative (−) power; and a sixth lens having negative (−) power.
1. An imaging lens comprising:
a first lens having positive (+) power;
a second lens having positive (+) power;
a third lens having positive (+) or negative (−) power;
a fourth lens having positive (+) or negative (−) power;
a fifth lens having positive (+) or negative (−) power; and
a sixth lens having negative (−) power,
wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are sequentially disposed from an object side, and
wherein when it is assumed that the entire focal length of the imaging lens is F and a distance between a surface of the first lens toward the object side and a surface of the sixth surface toward an image surface side on an optical axis is DL, a conditional equation of 0.7<DL/F<1.2 is satisfied.
2. The imaging lens as set forth in claim 1 , further comprising an aperture stop positioned to be closer to the object side or an image surface side as compared with any one of the first to fifth lenses.
3. The imaging lens as set forth in claim 2 , wherein the aperture stop is positioned between a surface of the first lens toward the object side and a surface of the third lens toward the object side.
4. The imaging lens as set forth in claim 1 , wherein the first lens is formed to be convex toward the object side.
5. The imaging lens as set forth in claim 1 , wherein at least one of the third and fourth lenses is formed to have the Abbe number of 30 or less.
6. The imaging lens as set forth in claim 1 , wherein the fifth lens is formed to be convex toward an image surface side.
7. The imaging lens as set forth in claim 1 , wherein the fifth lens is formed to have the positive (+) power and be convex toward the object side.
8. The imaging lens as set forth in claim 1 , wherein the fifth lens is formed to have the positive (+) power and be concave toward the object side.
9. The imaging lens as set forth in claim 1 , wherein the fifth lens is formed to have the negative (−) power and be concave toward the object side.
10. The imaging lens as set forth in claim 1 , wherein the fifth lens is formed to have a point of inflection on at least one of a surface thereof toward the object side and a surface thereof toward an image surface side.
11. The imaging lens as set forth in claim 1 , wherein the sixth lens is formed to have a point of inflection on a surface thereof toward an image surface side.
12. The imaging lens as set forth in claim 1 , wherein the sixth lens is formed to be concave toward an image surface side.
13. The imaging lens as set forth in claim 1 , wherein when it is assumed that a length from an incident surface of the first lens toward the object side to an image surface is TTL and the entire focal length of the imaging lens is F, a conditional equation of 0.95<TTL/F<1.45 is satisfied.
14. The imaging lens as set forth in claim 1 , wherein when it is assumed that a length from an incident surface of the first lens toward the object side to an image surface is TTL and the entire focal length of the imaging lens is F, a conditional equation of 1.15<TTL/F<1.45 is satisfied.
15. The imaging lens as set forth in claim 1 , wherein when it is assumed that a synthetic focal length of the first and second lenses is F 12 and the entire focal length of the imaging lens is F, a conditional equation of 0.5<F/F 12 <2.5 is satisfied.
16. The imaging lens as set forth in claim 1 , wherein when it is assumed that a synthetic focal length of the third and fourth lenses is F 34 and the entire focal length of the imaging lens is F, a conditional equation of −2.5<F/F 34 <−0.4 is satisfied.
17. The imaging lens as set forth in claim 1 , wherein the third lens is formed to have the negative (−) power, and
the fourth lens is formed to have the positive (+) power.
18. The imaging lens as set forth in claim 1 , wherein the third lens is formed to have the negative (−) power, and
the fourth lens is formed to have the negative (−) power.
19. The imaging lens as set forth in claim 1 , wherein the third lens is formed to have the positive (+) power, and
the fourth lens is formed to have the negative (−) power.
20. The imaging lens as set forth in claim 1 , wherein the third lens is formed to have the positive (+) power, and
the fourth lens is formed to have the positive (+) power.
21. The imaging lens as set forth in claim 1 , wherein when it is assumed that a focal length of the first lens is Fl and the entire focal length of the imaging lens is F, a conditional equation of 0<F/F 1 <1.5 is satisfied.
22. The imaging lens as set forth in claim 1 , wherein when it is assumed that a focal length of the third lens is F 3 and the entire focal length of the imaging lens is F, a conditional equation of 0.2<F/F 3 <2.5 is satisfied.
23. The imaging lens as set forth in claim 1 , wherein when it is assumed that a focal length of the fifth lens is F 5 , a focal length of the six lens is F 6 , and the entire focal length of the imaging lens is F, a conditional equation of 0.3<F/F 5 +F/F 6 <6.0 is satisfied.
24. The imaging lens as set forth in claim 1 , wherein when it is assumed that a length from an incident surface of the first lens toward the object side to an image surface is TTL and an image height is ImgH, a conditional equation of 0.35<TTL/2ImgH<0.95 is satisfied.
25. The imaging lens as set forth in claim 1 , wherein when it is assumed that a field of view of the imaging lens is FOV, a condition equation of 65<FOV<88 is satisfied.
26. The imaging lens as set forth in claim 1 , wherein when it is assumed that an average of the Abbe numbers of the first and second lenses is v12 and an average of the Abbe numbers of the third and fourth lenses is v34, a Conditional Equation of 10<v12−v34<45 is satisfied.
27. The imaging lens as set forth in claim 1 , wherein when it is assumed that a focal length of the third lens is F 3 , a focal length of the fourth lens is F 4 , and the entire focal length of the imaging lens is F, a conditional equation of 0<|F/F 3 |+|F/F 4 |<3 is satisfied.
28. The imaging lens as set forth in claim 1 , wherein when it is assumed that a length from an incident surface of the first lens toward the object side to an image surface is TTL and the entire focal length of the imaging lens is F, a conditional equation of 0.95<TTL/F<1.35 is satisfied.
29. The imaging lens as set forth in claim 1 , wherein when it is assumed that a radius of curvature of a surface of the first lens toward an image surface side is r12 and the entire focal length of the imaging lens is F, a conditional equation of 0.15<r12/F<0.9 is satisfied.
30. The imaging lens as set forth in claim 1 , wherein when it is assumed that a focal length of the first lens is F 1 and a focal length of the third lens is F 3 , a conditional equation of 0<|F 1 /F 3 |<25 is satisfied.
31. The imaging lens as set forth in claim 1 , wherein when it is assumed that a radius of curvature of a surface of the fifth lens toward the object side is r9 and a radius of curvature of a surface of the fifth lens toward an image surface side is r10, a conditional equation of 0<|(r9−r10)/(r9+r10)|<6 is satisfied.
32. The imaging lens as set forth in claim 1 , wherein when it is assumed that the entire focal length of the imaging lens is F, a focal length of the first lens is F 1 , and a focal length of the second lens is F 2 , a conditional equation of 0.2<|F/F 1 |+|F/F 2 |<4 is satisfied.
33. The imaging lens as set forth in claim 1 , wherein when it is assumed that a focal length of the first lens is F 1 , a focal length of the second lens is F 2 , a focal length of the third lens is F 3 , and a focal length of the fourth lens is F 4 , a conditional equation of 0<(|F 1 |+|F 2 |)/(|F 3 |+|F 4 |)<30 is satisfied.
34. The imaging lens as set forth in claim 1 , wherein when it is assumed that the entire focal length of the imaging lens is F, a focal length of the fourth lens is F 4 , a focal length of the fifth lens is F 5 , and a focal length of the sixth lens is F 6 , a conditional equation of 0.20<|F/F 4 |+|F/F 5 |+|F/F 6 |<7.5 is satisfied.
35. The imaging lens as set forth in claim 1 , wherein when it is assumed that the Abbe number of the fourth lens is v4 and the Abbe number of the fifth lens is v5, a conditional equation of 42<v4+v5<115 is satisfied.