US 2026/0227609 A1Published application

Zoom lens and imaging apparatus

AssigneeSony Group Corporation

InventorFumikazu KANETAKA

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Abstract

A zoom lens according to the present disclosure includes: a front-side lens group; and a rear-side lens group that includes a focus lens group disposed on a side closest to the object and moving in an optical axis direction upon focusing from an infinity object to a short-distance object. The front-side lens group includes: a first positive lens group disposed on the side closest to the object, fixed when varying magnification, and having positive refractive power; one or more negative lens groups moving when varying the magnification and each having negative refractive power; and one or more second positive lens groups moving when varying the magnification, and each having positive refractive power. A lens group having strongest negative refractive power, among the one or more negative lens groups, moves to allow an interval to the first positive lens group to be largest at a telephoto end when varying the magnification.

Claims11

Dependent claims

A zoom lens comprising, in order from a side of an object toward a side of an image plane:

a front-side lens group;
and
a rear-side lens group including a focus lens group disposed on a side closest to the object, the focus lens group moving in an optical axis direction upon focusing from an infinity object to a short-distance object, wherein
the front-side lens group includes
a first positive lens group disposed on the side closest to the object and being fixed at a time of varying magnification, the first positive lens group having positive refractive power,
one or more negative lens groups that move at the time of varying the magnification, the one or more negative lens groups each having negative refractive power, and
one or more second positive lens groups that move at the time of varying the magnification, the one or more second positive lens groups each having positive refractive power,
a lens group having strongest negative refractive power, among the one or more negative lens groups, moves to allow an interval with respect to the first positive lens group to be largest at a telephoto end at the time of varying the magnification,
a lens group having strongest positive refractive power, among the one or more second positive lens groups, is disposed on a side closer to the image plane than the lens group having the strongest negative refractive power, the lens group having the strongest positive refractive power moving to allow an interval with respect to the lens group having the strongest negative refractive power to be smallest at the telephoto end at the time of varying the magnification, and
the following conditional expression is satisfied:
0.2
<
fl
⁢
1
/
SQRT
⁢
(
fw
*
ft
)
<
0.455
(
1
)
where
fl1 denotes a focal distance of the first positive lens group,
fw denotes a focal distance of a total system at a wide-angle end upon infinity focusing, and
ft denotes a focal distance of the total system at the telephoto end upon infinity focusing.

29 more elements

An imaging apparatus comprising:

a zoom lens;
and
an imaging element that outputs an imaging signal corresponding to an optical image formed by the zoom lens,
the zoom lens including, in order from a side of an object toward a side of an image plane
a front-side lens group, and
a rear-side lens group including a focus lens group disposed on a side closest to the object, the focus lens group moving in an optical axis direction upon focusing from an infinity object to a short-distance object, wherein
the front-side lens group includes
a first positive lens group disposed on the side closest to the object and being fixed at a time of varying magnification, the first positive lens group having positive refractive power,
one or more negative lens groups that move at the time of varying the magnification, the one or more negative lens groups each having negative refractive power, and
one or more second positive lens groups that move at the time of varying the magnification, the one or more second positive lens groups each having positive refractive power,
a lens group having strongest negative refractive power, among the one or more negative lens groups, moves to allow an interval with respect to the first positive lens group to be largest at a telephoto end at the time of varying the magnification,
a lens group having strongest positive refractive power, among the one or more second positive lens groups, is disposed on a side closer to the image plane than the lens group having the strongest negative refractive power, the lens group having the strongest positive refractive power moving to allow an interval with respect to the lens group having the strongest negative refractive power to be smallest at the telephoto end at the time of varying the magnification, and
the following conditional expression is satisfied:
0.2
<
fl
⁢
1
/
SQRT
⁢
(
fw
*
ft
)
<
0.455
(
1
)
where
fl1 denotes a focal distance of the first positive lens group,
fw denotes a focal distance of a total system at a wide-angle end upon infinity focusing, and
ft denotes a focal distance of the total system at the telephoto end upon infinity focusing.

32 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/147,787Filed 5 Dec 2023
Priority: JP 2023-00726720 Jan 2023
Published: 6 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

G02B 13/009
Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras: having zoom function
G02B 7/025
For lenses: using glue
G02B 13/006
Employing a special optical element: at least one element being a compound optical element, e.g. cemented elements
G02B 13/02
Optical objectives specially designed for the purposes specified below: telephoto objectives, i.e. systems of the type + - in which the distance…