Imaging lens and imaging apparatus equipped with the imaging lens
AssigneeFUJIFILM Corporation
InventorsMASATO KONDO, MICHIO CHO
Life of this patent
Estimating the term…
Abstract
An imaging lens consists of five lenses, including: a first lens having a positive refractive power and a meniscus shape with a convex surface toward the object side, a second lens having a biconcave shape with the surface having the radius of curvature with the smaller absolute value toward the image side, a third lens having a meniscus shape with a convex surface toward the object side, a fourth lens having a negative refractive power and a meniscus shape with a convex surface toward the image side, and a fifth lens having a negative refractive power and a meniscus shape with a concave surface toward the image side, the image-side surface thereof having at least one inflection point, disposed in this order from the object side.
Claims20
An imaging lens consisting of, in order from the object side to the image side:
- a first lens having a positive refractive power and a meniscus shape with a convex surface toward the object side;
- a second lens having a biconcave shape with the surface having the radius of curvature with the smaller absolute value toward the image side;
- a third lens having a meniscus shape with a convex surface toward the object side;
- a fourth lens having a negative refractive power and a meniscus shape with a convex surface toward the image side;
- and
- a fifth lens having a negative refractive power and a meniscus shape with a concave surface toward the image side, the image-side surface having at least one inflection point,
- wherein
- the conditional formula below is satisfied:
- −0.45<f/f45<−0.23 (1-1),
- where
- f is the focal length of the entire system, and
- f45 is the combined focal length of the fourth lens and the fifth lens.
An imaging lens consisting of, in order from the object side to the image side:
- a first lens having a positive refractive power and a meniscus shape with a convex surface toward the object side;
- a second lens having a biconcave shape with the surface having the radius of curvature with the smaller absolute value toward the image side;
- a third lens having a meniscus shape with a convex surface toward the object side;
- a fourth lens having a negative refractive power and a meniscus shape with a convex surface toward the image side;
- and
- a fifth lens having a negative refractive power and a meniscus shape with a concave surface toward the image side, the image-side surface having at least one inflection point,
- wherein
- the conditional formula below is satisfied:
- 0.8<f/f1≦1.268 (6-2),
- where
- f is the focal length of the entire system, and
- f1 is the focal length of the first lens.
Dependencies are inferred from the claim text.