Imaging lens and imaging apparatus equipped with the imaging lens
AssigneeFUJIFILM Corporation
InventorsTakayuki NODA, Michio CHO
Life of this patent
Estimating the term…
Abstract
An imaging lens substantially includes six lenses, constituted by: a first lens having a negative refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, a concave surface toward an image side, and at least one inflection point in the surface toward the image side; provided in this order from an object side. The imaging lens satisfies a predetermined conditional formula.
Claims20
An imaging lens substantially consisting of six lenses, including:
- a first lens having a negative refractive power;
- a second lens having a positive refractive power;
- a third lens having a positive refractive;
- a fourth lens having a negative refractive power;
- a fifth lens having a positive refractive power;
- and
- a sixth lens having a negative refractive power, a concave surface toward an image side, and at least one inflection point on the surface toward the image side;
- provided in this order from an object side;
- the imaging lens satisfying the following conditional formula:
- 1<f·tan ω/R6r<20 (1)
- wherein f is the focal length of the entire system, ω is the half angle of view, and R6r is the paraxial radius of curvature of the surface of the sixth lens toward the image side.
An imaging lens substantially consisting of six lenses, including:
- a first lens having a negative refractive power;
- a second lens having a positive refractive power;
- a third lens having a positive refractive;
- a fourth lens having a negative refractive power;
- a fifth lens having a positive refractive power;
- and
- a sixth lens having a negative refractive power, a concave surface toward an image side, and at least one inflection point on the surface toward the image side;
- provided in this order from an object side;
- the imaging lens satisfying the following conditional formula:
- −0.3<f/f12<0 (2)
- wherein f is the focal length of the entire system, and f12 is the combined focal length of the first lens and the second lens.
An imaging lens substantially consisting of six lenses, including:
- a first lens having a negative refractive power and a concave surface toward an object side;
- a second lens having a positive refractive power;
- a third lens having a positive refractive;
- a fourth lens having a negative refractive power;
- a fifth lens having a positive refractive power;
- and
- a sixth lens having a negative refractive power, a concave surface toward an image side, and at least one inflection point on the surface toward the image side;
- provided in this order from the object side.
Dependencies are inferred from the claim text.