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US 2026/0235855 A1Published application
Zoom lens and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorKazufumi GOTO
Life of this patent
Estimating the term…
Abstract
A zoom lens may include, in order from an object side to an image side, a first lens unit with positive refractive power that does not move for magnification variation, a movable lens unit including at least two lens units that move for magnification variation, and a rear lens unit with positive refractive power that does not move for magnification variation. Each distance between adjacent lens units may change for magnification variation. Predetermined inequalities may be satisfied.
Claims15
A zoom lens comprising, in order from an object side to an image side:
- a first lens unit with positive refractive power that does not move for magnification variation;
- a movable lens unit including at least two lens units that move for magnification variation;
- and
- a rear lens unit with positive refractive power that does not move for magnification variation,
- wherein each distance between adjacent lens units changes for magnification variation, and
- wherein the following inequalities are satisfied:
- 0.2
- <
- (
- f
-
- 1
- +
- bok
-
- 1
- )
- /
- f
-
- 1
- <
- 0.7
- 3.
- 50
- <
- f
-
- t
- /
- f
-
- 1
- <
- 8.
- 3.
- 00
- <
- f
-
- 1
- /
- fw
- <
- 2
-
- 0
- .
- 0
-
- 0
- 35.
- 0
- <
- vdLN
- <
- 65.
- 0.56
- <
- θ
-
- CtLN
- -
- 0.0046
- ×
- <
- vdLN
- <
- 0.6
- where f1 is a focal length of the first lens unit, bok1 is a distance on an optical axis from a lens surface closest to an image plane in the first lens unit in an in-focus state at infinity to an image-side principal point of the first lens unit, ft is a focal length of the zoom lens at a telephoto end, fw is a focal length of the zoom lens at a wide-angle end, νdLN is an Abbe number for d-line of a negative lens included in the first lens unit, and θCtLN is a partial dispersion ratio for C-line and t-line of the negative lens.
67 more elements
An image pickup apparatus comprising:
- a zoom lens;
- and
- an image sensor,
- wherein the zoom lens includes, in order from an object side to an image side:
- a first lens unit with positive refractive power that does not move for magnification variation;
- a movable lens unit including at least two lens units that move for magnification variation;
- and
- a rear lens unit with positive refractive power that does not move for magnification variation,
- wherein each distance between adjacent lens units changes for magnification variation, and
- wherein the following inequalities are satisfied:
- 20
- <
- (
- f
-
- 1
- +
- bok
-
- 1
- )
- /
- f
-
- 1
- <
- 0.7
- 3.
- 50
- <
- f
-
- t
- /
- f
-
- 1
- <
- 8.
- 3.
- 00
- <
- f
-
- 1
- /
- fw
- <
- 2
-
- 0
- .
- 0
-
- 0
- 35.
- 0
- <
- vdLN
- <
- 65.
- 0.56
- <
- θ
-
- CtLN
- -
- 0.0046
- ×
- <
- vdLN
- <
- 0.6
- where f1 is a focal length of the first lens unit, bok1 is a distance on an optical axis from a lens surface closest to an image plane of the first lens unit in an in-focus state at infinity to an image-side principal point of the first lens unit, ft is a focal length of the zoom lens at a telephoto end, fw is a focal length of the zoom lens at a wide-angle end, νdLN is an Abbe number for d-line of a negative lens included in the first lens unit, and θCtLN is a partial dispersion ratio for C-line and t-line of the negative lens.
71 more elements
Dependencies are inferred from the claim text.