Imaging lens system
An imaging lens system includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed from an object side. The fourth lens has negative refractive power and the fifth lens has negative refractive power, and a ratio (TTL/2ImgHT) between a distance (TTL) from an object-side surface of the first lens to an imaging plane and a diagonal length (2ImgHT) of the imaging plane is 0.6 or less.
1. An imaging lens system, comprising:
a total of seven lenses with refractive power, the seven lenses comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed from an object side toward an imaging plane,
wherein the third lens comprises a convex image-side surface in a paraxial region,
wherein the fourth lens has negative refractive power,
wherein the fifth lens has negative refractive power, and
wherein a ratio (TTL/2ImgHT) between a distance (TTL) from an object-side surface of the first lens to an imaging plane and a diagonal length of the imaging plane (2ImgHT) is 0.6 or less.
2. The imaging lens system of claim 1 , wherein the fourth lens comprises a concave image-side surface.
3. The imaging lens system of claim 1 , wherein the fifth lens comprises a convex object-side surface.
4. The imaging lens system of claim 1 , wherein the fifth lens comprises a concave image-side surface.
5. The imaging lens system of claim 1 , wherein the sixth lens comprises a convex image-side surface.
6. The imaging lens system of claim 1 , wherein the third lens has positive refractive power.
7. The imaging lens system of claim 1 , wherein the sixth lens has positive refractive power.
8. The imaging lens system of claim 1 , wherein
−4.0< f 2/ f<− 1.0,
where f is a focal length of the imaging lens system, and f2 is a focal length of the second lens.
9. The imaging lens system of claim 1 , wherein
3.0< f 3/ f,
where f is a focal length of the imaging lens system, and f3 is a focal length of the third lens.
10. The imaging lens system of claim 1 , wherein
f 4/ f<− 3.0,
where f is a focal length of the imaging lens system, and f4 is a focal length of the fourth lens.
11. The imaging lens system of claim 1 , wherein
TTL/ f <1.2,
where f is a focal length of the imaging lens system.
12. An imaging lens system, comprising:
a total of seven lenses with refractive power, the seven lenses comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed from an object side toward an imaging plane,
wherein the third lens comprises a convex image-side surface in a paraxial region,
wherein the fourth lens comprises a concave image-side surface, and
wherein a ratio (TTL/2ImgHT) between a distance (TTL) from an object-side surface of the first lens to an imaging plane and a diagonal length (2ImgHT) of the imaging plane is 0.6 or less.
13. The imaging lens system of claim 12 , wherein
−9.0< f 4/ f<− 3.0,
where f is a focal length of the imaging lens system, and f4 is a focal length of the fourth lens.
14. The imaging lens system of claim 12 , wherein
−5.0< f 5/ f<− 1.0,
where f is a focal length of the imaging lens system, and f5 is a focal length of the fifth lens.
15. The imaging lens system of claim 12 , wherein
0.84< D 23/ D 34<0.96,
where D23 is a distance from an image-side surface of the second lens to an object-side surface of the third lens, and D34 is a distance from an image-side surface of the third lens to an object-side surface of the fourth lens.
16. The imaging lens system of claim 12 , wherein
0.60< D 56/ D 67<0.70,
where D56 is a distance from an image-side surface of the fifth lens to an object-side surface of the sixth lens, and D67 is a distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens.
17. An imaging lens system, comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed from an object side toward an imaging plane,
wherein the third lens comprises a convex image-side surface in a paraxial region,
wherein the fourth lens has negative refractive power,
wherein the fifth lens has negative refractive power, and a convex object-side surface, and
wherein a ratio (TTL/2ImgHT) between a distance (TTL) from an object-side surface of the first lens to an imaging plane and a diagonal length of the imaging plane (2ImgHT) is 0.6 or less.