Lens apparatus and image pickup system having the same
AssigneeCanon Kabushiki Kaisha
InventorKeisuke Makita
Life of this patent
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Abstract
A lens apparatus includes a magnification variator configured to move during magnification variation, a drive unit that drives the magnification variator, an output unit that outputs a first drive command, and a controller configured to: derive, based on the first drive command, a second drive command so that the second drive command satisfies a predetermined condition related to a moving speed of the magnification variator and a variation of a field-of-view change rate in a case where the magnification variator is driven with the second drive command is smaller than a variation of a field-of-view change rate in a case where the magnification variator is driven with the first drive command; and control the drive unit based on the second drive command.
Claims12
A lens apparatus comprising:
- a lens configured to be moved along an optical axis for varying a focal length of the lens apparatus;
- an actuator configured to move the lens;
- and
- a controller configured to:
- obtain a first command for the actuator;
- derive a second command for the actuator based on the first command so that a variation of a field-of-view change rate in a case where the lens is moved along the optical axis based on the second command is smaller than a variation of a field-of-view change rate in a case where the lens is moved along the optical axis based on the first command;
- and
- output the second command to control the actuator,
- wherein, in a case where a moving speed of the lens for the second command about a first position of the lens exceeds a predetermined limit speed of the lens, the controller is configured to derive the second command so that a moving speed of the lens for the second command about the first position does not exceed the predetermined limit speed, and a moving speed of the lens for the second command about a second position, different from the first position, of the lens is changed to compensate for change in time necessary to move the lens due to the derived second command about the first position.
An image pickup apparatus comprising:
- a lens apparatus;
- and
- an image pickup element configured to pick up an image formed by the lens apparatus,
- wherein the lens apparatus includes:
- a lens configured to be moved along an optical direction for magnification variation;
- an actuator configured to move the lens;
- and
- a controller configured to:
- obtain a first command for the actuator;
- derive a second command for the actuator based on the first command so that a variation of a field-of-view change rate in a case where the lens is moved along the optical axis based on the second command is smaller than a variation of a field-of-view change rate in a case where the lens is moved along the optical axis based on the first command;
- and
- output the second command to control the actuator,
- wherein, in a case where a moving speed of the lens for the second command about a first position of the lens exceeds a predetermined limit speed of the lens, the controller is configured to derive the second command so that a moving speed of the lens for the second command about the first position does not exceed the predetermined limit speed, and a moving speed of the lens for the second command about a second position, different from the first position, of the lens is changed to compensate for change in time necessary to move the lens due to the derived second command about the first position.
Dependencies are inferred from the claim text.