Imaging lens and imaging apparatus equipped with the imaging lens
AssigneeFUJIFILM Corporation
InventorPing Sun
Life of this patent
Estimating the term…
Abstract
An imaging lens is constituted by six lenses, including: a first lens having a positive refractive power and a convex surface toward the object side; a second lens having a negative refractive power and a convex surface toward the object side; a third lens having a positive refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power and a convex surface toward the object side; and a sixth lens having a negative refractive power, provided in this order from the object side. The imaging lens satisfies a predetermined conditional formula.
Claims18
An imaging lens consisting of six lenses, including:
- a first lens having a positive refractive power and a convex surface toward the object side;
- a second lens having a negative refractive power and a convex surface toward the object side;
- a third lens having a positive refractive power;
- a fourth lens having a positive refractive power;
- a fifth lens having a positive refractive power and a convex surface toward the object side;
- and
- a sixth lens having a negative refractive power, provided in this order from the object side;
- the imaging lens satisfying the following conditional formulae:
- f23/f<−2.5 (1);
- 2<f34/f<4.5 (2)
- wherein f23 is the combined focal length of the second lens and the third lens, f34 is the combined focal length of the third lens and the fourth lens, and f is the focal length of the entire system.
An imaging lens consisting of six lenses, including:
- a first lens having a positive refractive power and a convex surface toward the object side;
- a second lens having a negative refractive power and a convex surface toward the object side;
- a third lens having a positive refractive power;
- a fourth lens having a positive refractive power;
- a fifth lens having a positive refractive power and a convex surface toward the object side;
- and
- a sixth lens having a negative refractive power, provided in this order from the object side;
- the imaging lens satisfying the following conditional formulae:
- f23/f<−2.5 (1);
- 2<f3/f<9 (5)
- wherein f23 is the combined focal length of the second lens and the third lens, f3 is the focal length of the third lens, and f is the focal length of the entire system.
An imaging lens consisting of six lenses, including:
- a first lens having a positive refractive power and a convex surface toward the object side;
- a second lens having a negative refractive power and a convex surface toward the object side;
- a third lens having a positive refractive power;
- a fourth lens having a positive refractive power;
- a fifth lens having a positive refractive power and a convex surface toward the object side;
- and
- a sixth lens having a negative refractive power, provided in this order from the object side;
- the imaging lens satisfying the following conditional formulae:
- f23/f<−2.5 (1);
- 1.15<f1/f5<3 (8)
- wherein f23 is the combined focal length of the second lens and the third lens, f is the focal length of the entire system, f1 is the focal length of the first lens, and f5 is the focal length of the fifth lens.
Dependencies are inferred from the claim text.