Zoom lens and imaging apparatus
AssigneeFUJIFILM Corporation
InventorsTakuya Tanaka, Takuya Tanaka, Masanao Kawana, Yasutaka Shimada
Life of this patent
Estimating the term…
Abstract
The zoom lens consists of, in order from an object side, a positive first lens group, a negative second lens group, a third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the second lens group, the third lens group, and the fourth lens group move. The first lens group consists of, in order from an object side, a negative first a lens group, a positive first b lens group that moves during focusing, and a positive first c lens group. A most-image-side lens of the first b lens group is a negative meniscus lens having a convex surface facing an object side.
Claims14
A zoom lens consisting of, in order from an object side to an image side:
- a first lens group that has a positive refractive power;
- a second lens group that has a negative refractive power;
- a third lens group that has a refractive power;
- a fourth lens group that has a positive refractive power;
- and
- a fifth lens group that has a positive refractive power,
- wherein during zooming from a wide-angle end to a telephoto end, the first lens group and the fifth lens group remain stationary with respect to an image plane, the second lens group moves to an image side, and the third lens group and the fourth lens group move along an optical axis while changing a distance with each of adjacent lens groups,
- wherein the first lens group consists of, in order from an object side to an image side, a first a lens group that remains stationary with respect to an image plane during focusing and has a negative refractive power, a first b lens group that moves along an optical axis during focusing and has a positive refractive power, and a first c lens group that remains stationary with respect to an image plane during focusing and has a positive refractive power,
- wherein a most-image-side lens of the first b lens group is a negative meniscus lens having a convex surface facing an object side, and
- wherein an absolute value of a radius of curvature of a surface, of a most-object-side lens of the first c lens group, on an object side is smaller than an absolute value of a radius of curvature of a surface, of the most-image-side lens of the first b lens group, on an image side.
Dependencies are inferred from the claim text.