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US 12,754,399 B2Granted
Imaging optical system and image pickup apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorTakashi Okada
Life of this patent
Estimating the term…
Abstract
An imaging optical system includes an imaging lens, and an optical element disposed on an image side of the imaging lens. At least one surface of the optical element is a diffractive surface with a controlled wavelength dispersion characteristic. Predetermined inequalities are satisfied.
Claims10
An imaging optical system comprising:
- an imaging lens;
- and
- an optical element disposed on an image side of the imaging lens,
- wherein at least one surface of the optical element is a diffractive surface with a controlled wavelength dispersion characteristic, and
- wherein where ν0 is an Abbe number of the diffractive surface, a reference wavelength is d-line, primary dispersion is F-line and C-line, ψ(λd), ψ(λF), and ψ(λC) are optical path difference functions for the d-line, the F-line, and the C-line, respectively, P(λd), P(λF), and P(λC) are optical path difference dispersions of a surface for the d-line, the F-line, and the C-line, respectively, the following equation is satisfied:
- 1
- v
- 0
- ≡
- ψ
-
- (
- λ
- F
- )
- -
- ψ
-
- (
- λ
- C
- )
- ψ
-
- (
- λ
- d
- )
- =
- λ
- F
-
- P
-
- (
- λ
- F
- )
- -
- λ
- C
-
- P
-
- (
- λ
- C
- )
- λ
- d
-
- P
-
- (
- λ
- d
- )
- ,
- and
- the following inequalities are satisfied:
- -
- 1.5
- <
- Tk
- /
- fl
- <
- 02
- -
- 0.1
-
- 0
- <
- 1
- /
- v
- 0
- <
- 0
- .
- 0
-
- 2
- where Tk is an exit pupil position of the imaging lens in which a sign on an object side is negative with respect to an image plane as a reference, and fl is a focal length of the optical element.
81 more elements
An imaging optical system comprising:
- an imaging lens;
- and
- an optical element disposed on an image side of the imaging lens,
- wherein at least one surface of the optical element is a metasurface with a controlled wavelength dispersion characteristic,
- wherein where ν0 is an Abbe number of the metasurface, a reference wavelength is d-line, primary dispersion is F-line and C-line, ψ(λd), ψ(λF), and ψ(λC) are optical path difference functions for the d-line, the F-line, and the C-line, respectively, P(λd), P(λF), and P(λC) are optical path difference dispersions of a surface for the d-line, the F-line, and the C-line, respectively, the following equation is satisfied:
- 1
- v
- 0
- ≡
- ψ
-
- (
- λ
- F
- )
- -
- ψ
-
- (
- λ
- C
- )
- ψ
-
- (
- λ
- d
- )
- =
- λ
- F
-
- P
-
- (
- λ
- F
- )
- -
- λ
- C
-
- P
-
- (
- λ
- C
- )
- λ
- d
-
- P
-
- (
- λ
- d
- )
- ,
- and
- the following inequalities are satisfied:
- -
- 1.5
- <
- Tk
- /
- fl
- <
- 0.2
- -
- 0.1
-
- 0
- <
- 1
- /
- v
- 0
- <
- 0
- .
- 0
-
- 2
- where Tk is an exit pupil position of the imaging lens in which a sign on an object side is negative with respect to an image plane as a reference, and fl is a focal length of the optical element.
81 more elements
An image pickup apparatus comprising:
- an imaging optical system;
- and
- an image sensor configured to image an object through the imaging optical system,
- wherein the imaging optical system includes:
- an imaging lens;
- and
- an optical element disposed on an image side of the imaging lens,
- wherein at least one surface of the optical element is a diffractive surface with a controlled wavelength dispersion characteristic, and
- wherein where ν0 is an Abbe number of the diffractive surface, a reference wavelength is d-line, primary dispersion is F-line and C-line, ψ(λd), ψ(λF), and ψ(λC) are optical path difference functions for the d-line, the F-line, and the C-line, respectively, P(λd), P(λF), and P(λC) are optical path difference dispersions of a surface for the d-line, the F-line, and the C-line, respectively, the following equation is satisfied:
- 1
- v
- 0
- ≡
- ψ
-
- (
- λ
- F
- )
- -
- ψ
-
- (
- λ
- C
- )
- ψ
-
- (
- λ
- d
- )
- =
- λ
- F
-
- P
-
- (
- λ
- F
- )
- -
- λ
- C
-
- P
-
- (
- λ
- C
- )
- λ
- d
-
- P
-
- (
- λ
- d
- )
- ,
- and
- the following inequalities are satisfied:
- -
- 1.5
- <
- Tk
- /
- fl
- <
- 0.2
- -
- 0.1
- <
- 1
- /
- v
- 0
- <
- 0
- .
- 0
-
- 2
- where Tk is an exit pupil position of the imaging lens in which a sign on an object side is negative with respect to an image plane as a reference, and fl is a focal length of the optical element.
83 more elements
An image pickup apparatus comprising:
- an imaging optical system;
- and
- an image sensor configured to image an object through the imaging optical system,
- wherein the imaging optical system includes:
- an imaging lens;
- and
- an optical element disposed on an image side of the imaging lens,
- wherein at least one surface of the optical element is a metasurface with a controlled wavelength dispersion characteristic,
- wherein where ν0 is an Abbe number of the metasurface, a reference wavelength is d-line, primary dispersion is F-line and C-line, ψ(λd), ψ(λF), and ψ(λC) are optical path difference functions for the d-line, the F-line, and the C-line, respectively, P(λd), P(λF), and P(λC) are optical path difference dispersions of a surface for the d-line, the F-line, and the C-line, respectively, the following equation is satisfied:
- 1
- v
- 0
- ≡
- ψ
-
- (
- λ
- F
- )
- -
- ψ
-
- (
- λ
- C
- )
- ψ
-
- (
- λ
- d
- )
- =
- λ
- F
-
- P
-
- (
- λ
- F
- )
- -
- λ
- C
-
- P
-
- (
- λ
- C
- )
- λ
- d
-
- P
-
- (
- λ
- d
- )
- ,
- and
- the following inequalities are satisfied:
- -
- 1.5
- <
- Tk
- /
- fl
- <
- 0.2
- -
- 0.1
- <
- 1
- /
- v
- 0
- <
- 0
- .
- 0
-
- 2
- where Tk is an exit pupil position of the imaging lens in which a sign on an object side is negative with respect to an image plane as a reference, and fl is a focal length of the optical element.
83 more elements
Dependencies are inferred from the claim text.