Imaging lens and imaging device provided with the same
AssigneeFUJIFILM Corporation
InventorsTakuya TANAKA, Tatsuro IWASAKI, Michio CHO
Life of this patent
Estimating the term…
Abstract
An imaging lens substantially consists of five lenses consisting of, in order from the object side: a first lens having a positive refractive power and having a meniscus shape with the convex surface toward the object side; a second lens having a biconcave shape; a third lens having a positive refractive power and having a meniscus shape with the convex surface toward the image side; a fourth lens having a positive refractive power and having a convex surface toward the image side; and a fifth lens having a negative refractive power, wherein a predetermined conditional expression is satisfied.
Claims20
An imaging lens substantially consisting of five lenses consisting, in order from an object side:
- a first lens having a positive refractive power and having a meniscus shape with a convex surface toward the object side;
- a second lens having a biconcave shape;
- a third lens having a positive refractive power and having a meniscus shape with a convex surface toward an image side;
- a fourth lens having a positive refractive power and having a convex surface toward the image side;
- and
- a fifth lens having a negative refractive power,
- wherein the conditional expression below is satisfied:
- 0.4<f/f4<2 (1),
- where f is a focal length of the entire system, and f4 is a focal length of the fourth lens.
An imaging lens substantially consisting of five lenses consisting, in order from an object side:
- a first lens having a positive refractive power and having a meniscus shape with a convex surface toward the object side;
- a second lens having a biconcave shape;
- a third lens having a positive refractive power and having a meniscus shape with a convex surface toward an image side;
- a fourth lens having a positive refractive power and having a convex surface toward the image side;
- and
- a fifth lens having a negative refractive power, wherein the conditional expression below is satisfied:
- −8<f·tan ω/L4r<−0.4 (2),
- where f is a focal length of the entire system, ω is a half angle of view, and L4r is a paraxial radius of curvature of an image-side surface of the fourth lens.
Dependencies are inferred from the claim text.