Focusing apparatus and method for controlling the same, and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorShun Nakamura
Life of this patent
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Abstract
The defocus amount of an imaging optical system is detected based on a pair of image signals that are obtained from an image sensor and are used for phase-difference detection automatic focusing. In a first mode, the drive of a focusing lens is controlled so that the focusing lens is driven at a first speed if the reliability of the pair of image signal is at a first level, and at a second speed lower than the first speed if the reliability of the pair of image signals is at a second level higher than the first level.
Claims19
A focusing apparatus comprising:
- an image sensor configured to generate a pair of image signals used for phase-difference detection focusing;
- a determination unit that determines a reliability of the pair of image signals;
- and
- a control unit that controls drive of a focusing lens based on a phase difference between the pair of image signals,
- wherein
- in a first mode, the control unit controls the focusing lens so as to be driven at a first speed if the reliability of the pair of image signals is at a first level, and at a second speed lower than the first speed if the reliability is at a second level higher than the first level.
A method for controlling a focusing apparatus including an image sensor configured to generate a pair of image signals used for phase-difference detection focusing, the method comprising:
- a determination step of determining a reliability of the pair of image signals;
- and
- a control step of controlling drive of a focusing lens based on a phase difference between the pair of image signals,
- wherein
- in the control step, in a first mode, the focusing lens is controlled so as to be driven at a first speed if the reliability of the pair of image signals is at a first level, and at a second speed lower than the first speed if the reliability is at a second level higher than the first level.
Dependencies are inferred from the claim text.