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US 2026/0287868 A1Published application
Imaging lens and imaging apparatus
AssigneeFUJIFILM Corporation
InventorsHiroki SAITO, Ryoko TOMIOKA
Life of this patent
Estimating the term…
Abstract
An imaging lens consists of a front group, an aperture stop, and a rear group, in order from an object side. The rear group includes at least one Lp lens that is made of a resin, has a positive refractive power, and is cemented to a lens. Assuming that an Abbe number and a refractive index of the Lp lens are respectively vp and Np, the Lp lens satisfies Conditional Expression represented by 120<vp+94.24×Np<180. The imaging lens satisfies predetermined conditional expressions.
Claims20
An imaging lens consisting of, in order from an object side to an image side, a front group, an aperture stop, and a rear group,
- wherein the rear group includes at least one Lp lens that is made of a resin, has a positive refractive power, and is cemented to a lens,
- the Lp lens has both the object side surface and the image side surface cemented to lenses,
- a center thickness of the Lp lens is d,
- a curvature radius of an object side surface of the Lp lens is Rf,
- a curvature radius of an image side surface of the Lp lens is Rr,
- an open F number in a state in which the infinite distance object is in focus is FNo,
- a sum of an air-equivalent distance on an optical axis from a lens surface closest to the image side in the rear group to an image plane and a distance on the optical axis from a lens surface closest to the object side in the front group to the lens surface closest to the image side in the rear group in a state in which an infinite distance object is in focus is TL,
- a focal length of the imaging lens in a state in which the infinite distance object is in focus is f,
- a maximum half angle of view in a state in which the infinite distance object is in focus is ωm, and
- the air-equivalent distance on the optical axis from the lens surface closest to the image side in the rear group to the image plane in a state in which the infinite distance object is in focus is Bf,
- Conditional Expressions (2), (4), (5), and (11) are satisfied, which are represented by
- 0
- <
- d
- ×
- (
- 1
- /
- Rf
- -
- 1
- /
- Rr
- )
- <
- 0.05
- ,
- (
- 2
- )
- 1
- <
- FNo
- ×
- TL
- /
- (
- f
- ×
- tan
-
- ω
-
- m
- )
- <
- 30
- ,
- (
- 4
- )
- 0.4
- <
- Bf
- /
- (
- f
- ×
- tan
-
- ω
-
- m
- )
- <
- 1.7
- ,
- and
- (
- 5
- )
- 0.005
- <
- (
- Rf
- -
- Rr
- )
- /
- (
- Rf
- +
- Rr
- )
- <
- 0.45
- .
- (
- 11
- )
87 more elements
Dependencies are inferred from the claim text.