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US 2026/0299264 A1Published application
Composite optical element and optical system including the same
AssigneeCanon Kabushiki Kaisha
InventorJUNYA ICHIMURA
Life of this patent
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Abstract
A composite optical element includes a glass lens and a resin lens that are joined together. The resin lens has an aspheric shape. When Nd is a refractive index of the resin lens, vd is an Abbe number of the resin lens, and θgF is a partial dispersion ratio of the resin lens, Nd, vd, and θgF are appropriately set.
Claims21
A composite optical element comprising:
- a glass lens and a resin lens that are joined together,
- wherein the resin lens has an aspheric shape, and
- wherein, when Nd is a refractive index of the resin lens, vd is an Abbe number of the resin lens, and θgF is a partial dispersion ratio of the resin lens, the following inequalities are satisfied:
- 1.9
- <
- Nd
- +
- (
- 0.014
- ×
- vd
- )
- <
- 2.045
- 30.
- <
- vd
- <
- 35.
- 0.62
- <
- θ
-
- gF
- +
- (
- 0.0024
- ×
- vd
- )
- <
- 0.68
- .
30 more elements
An optical system comprising:
- a composite optical element including a glass lens and a resin lens that are joined together,
- wherein the resin lens has an aspheric shape, and
- wherein, when Nd is a refractive index of the resin lens, vd is an Abbe number of the resin lens, and θgF is a partial dispersion ratio of the resin lens, the following inequalities are satisfied:
- 1.9
- <
- Nd
- +
- (
- 0.014
- ×
- vd
- )
- <
- 2.045
- 30.
- <
- vd
- <
- 35.
- 0.62
- <
- θ
-
- gF
- +
- (
- 0.0024
- ×
- vd
- )
- <
- 0.68
- .
30 more elements
An imaging apparatus comprising:
- an optical system;
- and
- an image pickup device that receives an image formed by the optical system,
- wherein the optical system includes:
- a composite optical element including a glass lens and a resin lens that are joined together,
- wherein the resin lens has an aspheric shape, and
- wherein, when Nd is a refractive index of the resin lens, vd is an Abbe number of the resin lens, and θgF is a partial dispersion ratio of the resin lens, the following inequalities are satisfied:
- 1.9
- <
- Nd
- +
- (
- 0.014
- ×
- vd
- )
- <
- 2.045
- 30.
- <
- vd
- <
- 35.
- 0.62
- <
- θ
-
- gF
- +
- (
- 0.0024
- ×
- vd
- )
- <
- 0.68
- .
34 more elements
Dependencies are inferred from the claim text.