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US 11,454,789 B2Granted
Zoom lens and imaging apparatus
AssigneeFUJIFILM Corporation
InventorsTaiga Noda, Michio Cho
Life of this patent
Estimating the term…
Abstract
A zoom lens includes a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a fifth lens group in order from an object side. In a case of zooming, an interval with an adjacent lens group is changed. The third lens group includes two positive lenses consecutively arranged in order from a side closest to the object side to an image side. The fifth lens group consists of a negative meniscus lens having a concave surface toward the object side and a positive lens having a convex surface toward the object side in order from the object side to the image side.
Claims20
A zoom lens comprising:
- only five lens groups consisting of a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group in order from an object side to an image side as lens groups,
- wherein in a case of zooming from a wide angle end to a telephoto end, an interval between the first lens group and the second lens group is increased, an interval between the second lens group and the third lens group is changed, an interval between the third lens group and the fourth lens group is changed, and an interval between the fourth lens group and the fifth lens group is changed,
- the third lens group includes two positive lenses consecutively arranged in order from a side closest to the object side to the image side,
- the fifth lens group consists of a negative meniscus lens having a concave surface toward the object side and a positive lens having a convex surface toward the object side in order from the object side to the image side,
- a lens of the third lens group closest to the image side is moved in a direction intersecting with an optical axis in a case of image shake correction, and
- in a case where a lateral magnification of the fourth lens group at the wide angle end in a state where an object at infinity is focused is denoted by β4w, and a lateral magnification of the fourth lens group at the telephoto end in a state where the object at infinity is focused is denoted by β4t, Conditional Expression (1) is satisfied, which is represented by
- 1.45<β4t/β4w<2 (1).
4 more elements
A zoom lens comprising:
- only five lens groups consisting of a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group in order from an object side to an image side as lens groups,
- wherein in a case of zooming from a wide angle end to a telephoto end, an interval between the first lens group and the second lens group is increased, an interval between the second lens group and the third lens group is changed, an interval between the third lens group and the fourth lens group is changed, and an interval between the fourth lens group and the fifth lens group is changed,
- the third lens group includes two positive lenses consecutively arranged in order from a side closest to the object side to the image side,
- the fifth lens group consists of a negative meniscus lens having a concave surface toward the object side and a positive lens having a convex surface toward the object side in order from the object side to the image side, and
- in a case where a focal length of the third lens group is denoted by f3, and a focal length of the fifth lens group is denoted by f5, Conditional Expression (2) is satisfied, which is represented by
- −0.05<f3/f5<0.3 (2).
3 more elements
A zoom lens comprising:
- only five lens groups consisting of a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group in order from an object side to an image side as lens groups,
- wherein in a case of zooming from a wide angle end to a telephoto end, an interval between the first lens group and the second lens group is increased, an interval between the second lens group and the third lens group is changed, an interval between the third lens group and the fourth lens group is changed, and an interval between the fourth lens group and the fifth lens group is changed,
- the third lens group includes two positive lenses consecutively arranged in order from a side closest to the object side to the image side,
- the fifth lens group consists of a negative meniscus lens having a concave surface toward the object side and a positive lens having a convex surface toward the object side in order from the object side to the image side,
- the fourth lens group is moved along an optical axis in a case of focusing, and
- in a case where a lateral magnification of the fourth lens group at the telephoto end in a state where an object at infinity is focused is denoted by β4t, and a lateral magnification of the fifth lens group at the telephoto end in a state where the object at infinity is focused is denoted by β5t, Conditional Expression (4) is satisfied, which is represented by
- −10<(1−β4t2)×β5t2<−7 (4).
4 more elements
Dependencies are inferred from the claim text.