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US 10,871,626 B2Granted
Lens apparatus, image capturing apparatus, and control method
AssigneeCanon Kabushiki Kaisha
InventorKana Kobayashi
Life of this patent
Estimating the term…
Abstract
In a lens apparatus, an interchangeable lens includes an optical system including first and second focus lens units each configured to move in loci different from each other in focusing and a lens control unit configured to control positions of the first and second focus lens units. The lens control unit controls the positions of the first and second focus lens units based on target positions of the first and second focus lens units which are determined according to information about an optical element disposed between the optical system and an image sensor.
Claims13
A lens apparatus mountable on and removable from an image capturing apparatus including an image sensor, the lens apparatus comprising:
- an optical system including a first focus lens unit and a second focus lens unit each being configured to move in loci different from each other in focusing;
- and
- a lens control unit configured to control a position of the first focus lens unit and a position of the second focus lens unit,
- wherein the lens control unit controls the position of the first focus lens unit and the position of the second focus lens unit based on the loci of the first focus lens unit and the second focus lens unit, the loci of the first focus lens unit and the second focus lens unit being determined according to information about an optical element disposed between the optical system and the image sensor,
- wherein in a case where a configuration of the optical element between the optical system and the image sensor is in a first state, the lens control unit controls the position of the first focus lens unit and the position of the second focus lens unit such that the first focus lens unit and the second focus lens unit are arranged in a first arrangement to focus the optical system on a first subject distance, and
- wherein in a case where the configuration of the optical element between the optical system and the image sensor is in a second state different from the first state, the lens control unit controls the position of the first focus lens unit and the position of the second focus lens unit such that the first focus lens unit and the second focus lens unit are arranged in a second arrangement different from the first arrangement to focus the optical system on the first subject distance,
- wherein the following relationships are satisfied:
- (
- S
-
-
- 1
-
- S
-
-
- 1
-
- )
- ×
- (
- X
-
-
- 1
-
- X
-
-
- 1
-
- )
- +
- (
- S
-
-
- 2
-
- S
-
-
- 2
-
- )
- ×
- (
- X
-
-
- 2
-
- X
-
-
- 2
-
- )
- =
- 0
- (
- 1
- )
- S1=(1−βi12)×βi1r2, and
- S2=(1−βi22)×βi2r2,
- where βi1 is a lateral magnification of the first focus lens unit in the first arrangement, βi1 is a lateral magnification of the second focus lens unit in the first arrangement, βi1r is a combined lateral magnification of a lens unit disposed closer to an image side than the first focus lens unit in the first arrangement, βi2r is a combined lateral magnification of a lens unit disposed closer to the image side than the second focus lens unit in the first arrangement, X1 is an amount of movement of the first focus lens unit changed from the first arrangement to the second arrangement, X2 is an amount of movement of the second focus lens unit changed from the first arrangement to the second arrangement.
63 more elements
An image capturing apparatus on and from which a lens apparatus that includes an optical system including a first focus lens unit and a second focus lens unit each being configured to move in loci different from each other in focusing is mountable and removable, the image capturing apparatus comprising:
- an image sensor;
- and
- a camera control unit configured to determine a target position of the first focus lens unit and a target position of the second focus lens unit based on the loci of the first focus lens unit and the second focus lens unit determined according to information about an optical element disposed between the optical system and the image sensor,
- wherein in a case where a configuration of the optical element between the optical system and the image sensor is in a first state, the lens control unit controls the position of the first focus lens unit and the position of the second focus lens unit such that the first focus lens unit and the second focus lens unit are arranged in a first arrangement to focus the optical system on a first subject distance, and
- wherein in a case where the configuration of the optical element between the optical system and the image sensor is in a second state different from the first state, the lens control unit controls the position of the first focus lens unit and the position of the second focus lens unit such that the first focus lens unit and the second focus lens unit are arranged in a second arrangement different from the first arrangement to focus the optical system on the first subject distance,
- wherein the following relationships are satisfied:
- (
- S
-
-
- 1
-
- S
-
-
- 1
-
- )
- ×
- (
- X
-
-
- 1
-
- X
-
-
- 1
-
- )
- +
- (
- S
-
-
- 2
-
- S
-
-
- 2
-
- )
- ×
- (
- X
-
-
- 2
-
- X
-
-
- 2
-
- )
- =
- 0
- (
- 1
- )
- S1=(1−βi12)×βi1r2, and
- S2=(1−βi22)×βi2r2,
- where βi1is a lateral magnification of the first focus lens unit in the first arrangement, βi2 is a lateral magnification of the second focus lens unit in the first arrangement, βi1r is a combined lateral magnification of a lens unit disposed closer to an image side than the first focus lens unit in the first arrangement, βi2r is a combined lateral magnification of a lens unit disposed closer to the image side than the second focus lens unit in the first arrangement, X1 is an amount of movement of the first focus lens unit changed from the first arrangement to the second arrangement, X2 is an amount of movement of the second focus lens unit changed from the first arrangement to the second arrangement.
62 more elements
A method of controlling a lens apparatus that includes an optical system including a first focus lens unit and a second focus lens unit each configured to move in loci different from each other in focusing and that is mountable on and removable from an image capturing apparatus including an image sensor, the method comprising:
- determining a target position of the first focus lens unit and a target position of the second focus lens unit based on the loci of the first focus lens unit and the second focus lens unit determined according to information about an optical element disposed between the optical system and the image sensor;
- and
- controlling a position of the first focus lens unit and a position of the second focus lens unit based on the determined target positions, respectively,
- wherein in a case where a configuration of the optical element between the optical system and the image sensor is in a first state, the lens control unit controls the position of the first focus lens unit and the position of the second focus lens unit such that the first focus lens unit and the second focus lens unit are arranged in a first arrangement to focus the optical system on a first subject distance, and
- wherein in a case where the configuration of the optical element between the optical system and the image sensor is in a second state different from the first state, the lens control unit controls the position of the first focus lens unit and the position of the second focus lens unit such that the first focus lens unit and the second focus lens unit are arranged in a second arrangement different from the first arrangement to focus the optical system on the first subject distance,
- wherein the following relationships are satisfied:
- (
- S
-
-
- 1
-
- S
-
-
- 1
-
- )
- ×
- (
- X
-
-
- 1
-
- X
-
-
- 1
-
- )
- +
- (
- S
-
-
- 2
-
- S
-
-
- 2
-
- )
- ×
- (
- X
-
-
- 2
-
- X
-
-
- 2
-
- )
- =
- 0
- (
- 1
- )
- S1=(1−βi12)×βi1r2, and
- S2=(1−βi22)×βi2r2,
- where βi1 is a lateral magnification of the first focus lens unit in the first arrangement, βi2 is a lateral magnification of the second focus lens unit in the first arrangement, βi1r is a combined lateral magnification of a lens unit disposed closer to an image side than the first focus lens unit in the first arrangement, βi2r is a combined lateral magnification of a lens unit disposed closer to the image side than the second focus lens unit in the first arrangement, X1 is an amount of movement of the first focus lens unit changed from the first arrangement to the second arrangement, X2 is an amount of movement of the second focus lens unit changed from the first arrangement to the second arrangement.
62 more elements
Dependencies are inferred from the claim text.