Back to results
US 11,327,280 B2Granted
Zoom lens and imaging apparatus
AssigneeFUJIFILM Corporation
InventorsMotoari Ota, Masaru Yonezawa, Takuya Tanaka
Life of this patent
Estimating the term…
Abstract
The zoom lens consists of, in order from the object side, a positive first lens group that does not move during zooming, a negative second lens group that moves during zooming, a negative third lens group that moves during zooming, at least one lens group that moves during zooming, and a rear group that does not move during zooming. All distances between the lens groups adjacent to each other change during zooming. The zoom lens satisfies predetermined conditional expressions.
Claims20
A zoom lens consisting of, in order from an object side to an image side:
- a first lens group that remains stationary with respect to an image plane during zooming and has a positive refractive power;
- a second lens group that moves along an optical axis during zooming and has a negative refractive power;
- a third lens group that moves along the optical axis during zooming and has a negative refractive power;
- at least one lens group that moves along the optical axis during zooming;
- and
- a rear group that remains stationary with respect to the image plane during zooming,
- wherein all distances between the lens groups adjacent to each other change during zooming,
- wherein assuming that
- a focal length of the second lens group is f2, and
- a focal length of the third lens group is f3,
- Conditional Expression (1) is satisfied, which is represented by
- 0.001 < f3/f2 < 0.14 (1), and
- wherein the second lens group consists of one negative lens.
10 more elements
A zoom lens consisting of, in order from an object side to an image side:
- a first lens group that remains stationary with respect to an image plane during zooming and has a positive refractive power;
- a second lens group that moves along an optical axis during zooming and has a negative refractive power;
- a third lens group that moves along the optical axis during zooming and has a negative refractive power;
- at least one lens group that moves along the optical axis during zooming;
- and
- a rear group that remains stationary with respect to the image plane during zooming,
- wherein all distances between the lens groups adjacent to each other change during zooming,
- wherein assuming that
- a focal length of the second lens group is f2, and
- a focal length of the third lens group is f3,
- Conditional Expression (1) is satisfied, which is represented by
- 0.001 < f3 / f2 <0.14 (1),
- wherein assuming that
- a focal length of the first lens group is f1, and
- a focal length of the second lens group is f2,
- Conditional Expression (5) is satisfied, which is represented by
- −0.4 < f1 / f2 < −0.01 (5), and
- wherein the lens group disposed to be adjacent to the object side in the rear group has a negative refractive power.
15 more elements
A zoom lens consisting of, in order from an object side to an image side:
- a first lens group that remains stationary with respect to an image plane during zooming and has a positive refractive power;
- a second lens group that moves along an optical axis during zooming and has a negative refractive power;
- a third lens group that moves along the optical axis during zooming and has a negative refractive power;
- at least one lens group that moves along the optical axis during zooming;
- and
- a rear group that remains stationary with respect to the image plane during zooming,
- wherein all distances between the lens groups adjacent to each other change during zooming,
- wherein assuming that
- a focal length of the second lens group is f2, and
- a focal length of the third lens group is f3,
- Conditional Expression (1) is satisfied, which is represented by
- 0.001 < f3/ f2 < 0.14 (1),
- wherein assuming that
- a focal length of the first lens group is f1, and
- a focal length of the second lens group is f2,
- Conditional Expression (5) is satisfied, which is represented by
- −0.4 < f1/ f2 < −0.01 (5), and
- wherein assuming that
- an average value of refractive indexes of all lenses included in the second lens group at a d line is Nave, and
- an average value of Abbe numbers of all the lenses included in the second lens group based on the d line is νave,
- Conditional Expression (6) is satisfied, which is represented by
- 1.8 <Nave + 0.006 ×νave < 2.1 (6).
19 more elements
Dependencies are inferred from the claim text.