Imaging lens system
An imaging lens system includes a lens group including a plurality of lenses, and an optical path folding member disposed on an image side of the lens group, wherein −1.2<fR/PL<−0.40, where fR is a focal length of a rearmost lens disposed closest to an imaging plane in the lens group, and PL is a distance from an incident surface of the optical path folding member to an exit surface of the optical path folding member.
1. An imaging lens system comprising:
a lens group comprising a plurality of lenses sequentially disposed along an optical axis of the imaging lens system from an object-side surface of the lens group toward an imaging plane of the imaging lens system; and
an optical path folding member disposed on the optical axis between an image-side surface of the lens group and the imaging plane,
wherein the plurality of lenses comprise a fourth lens having a convex object-side surface in a paraxial region thereof, and
1.52<(TTL+ImgHT)/PL<2.32, where TTL is a distance along the optical axis from the object-side surface of the lens group to the imaging plane, ImgHT is a height of the imaging plane, and PL is a distance along the optical axis from an incident surface of the optical path folding member to an exit surface of the optical path folding member.
2. The imaging lens system of claim 1 , wherein 0.80<f/PL<2.0, where f is a focal length of the imaging lens system.
3. The imaging lens system of claim 1 , wherein 0.80<(|fF|+|fR|)/PL<2.40, where fF is a focal length of a frontmost lens disposed closest to an object in the lens group, and fR is a focal length of a rearmost lens disposed closest to the imaging plane in the lens group.
4. The imaging lens system of claim 1 , wherein 0.40<fF/PL<1.0, where fF is a focal length of a frontmost lens disposed closest to an object in the lens group.
5. The imaging lens system of claim 1 , wherein 0.20<LFS1/PL <0.60, where LFS1 is a radius of curvature on the optical axis of an object-side surface of a frontmost lens disposed closest to an object in the lens group.
6. The imaging lens system of claim 1 , wherein 0.20<LRS2/PL<0.60, where LRS2 is a radius of curvature on the optical axis of an image-side surface of a rearmost lens disposed closest to the imaging plane in the lens group.
7. The imaging lens system of claim 1 , wherein 0.40<(LFS1+LRS2)/PL<0.90, where LFS1 is a radius of curvature on the optical axis of an object-side surface of a frontmost lens disposed closest to an object in the lens group, and LRS2 is a radius of curvature on the optical axis of an image-side surface of a rearmost lens disposed closest to the imaging plane in the lens group.
8. The imaging lens system of claim 1 , wherein 0.10<TLG/PL<0.40, where TLG is a distance along the optical axis from an object-side surface of a frontmost lens disposed closest to an object in the lens group to an image-side surface of a rearmost lens disposed closest to the imaging plane in the lens group.
9. The imaging lens system of claim 1 , wherein 1.2<TTL/f<1.4, where f is a focal length of the imaging lens system.
10. An electronic device comprising:
one or more camera modules,
wherein at least one camera module among the one or more camera modules comprises the imaging lens system of claim 1 .
11. An imaging lens system comprising:
a lens group comprising a total of five lenses with refractive power, the five lenses comprising a first lens, a second lens, a third lens having a convex image-side surface in a paraxial region thereof, a fourth lens having a convex object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof, and a fifth lens having a convex object-side surface in a paraxial region thereof sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object-side surface of the first lens toward an imaging plane of the imaging lens system; and
an optical path folding member disposed on the optical axis between an image-side surface of the fifth lens and the imaging plane and comprising four or more reflective surfaces,
wherein −0.86<f5/PL<−0.46, where f5 is a focal length of the fifth lens, and PL is a distance along the optical axis from an incident surface of the optical path folding member to an exit surface of the optical path folding member.
12. The imaging lens system of claim 11 , wherein 0.5<f1/PL<0.9, where f1 is a focal length of the first lens.
13. The imaging lens system of claim 11 , wherein −0.40<(f1+f2)/PL<−0.10, where f1 is a focal length of the first lens, and f2 is a focal length of the second lens.
14. The imaging lens system of claim 11 , wherein 0.60<(f1+f2+f3)/PL<1.20, where f1 is a focal length of the first lens, f2 is a focal length of the second lens, and f3 is a focal length of the third lens.
15. The imaging lens system of claim 11 , wherein 1.60<(f1+f2+f3+f4)/PL<2.60, where f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.
16. The imaging lens system of claim 11 , wherein 1.60<(f1+f2+f3+f4+f5)/PL<2.0, where f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.
17. An electronic device comprising:
one or more camera modules,
wherein at least one camera module among the one or more camera modules comprises the imaging lens system of claim 11 .
18. An imaging lens system comprising:
a lens group comprising a first lens, a second lens, a third lens, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power and a convex object-side surface in a paraxial region thereof sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object-side surface of the first lens toward an imaging plane of the imaging lens system; and
an optical path folding member disposed on the optical axis between an image-side surface of the fifth lens and the imaging plane,
wherein 0.7<BFL/TTL, where BFL is a distance along the optical axis from the image-side surface of the fifth lens to the imaging plane, and TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane.
19. An electronic device comprising:
one or more camera modules,
wherein at least one camera module among the one or more camera modules comprises the imaging lens system of claim 18 .