Focus adjustment apparatus, image sensing apparatus, focus adjustment method, control program for focus adjustment apparatus, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorHitoshi Yasuda
Life of this patent
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Abstract
This invention has as its object to prevent a conventional problem in that the focal point position cannot be determined before and after an in-focus point, even in a slow shutter mode. To this end, a camera control microcomputer of a video camera determines the drive amount of a focus lens for one field in accordance with the rotation angle of a manual focus dial when the shutter speed is {fraction (1/60)} sec, {fraction (1/30)} sec, or {fraction (1/15)} sec, and controls a focus compensation lens driver and focus compensation lens motor to drive the focus lens by the determined drive amount in a direction corresponding to the detected rotation direction of the manual focus dial.
Claims15
A focus adjustment apparatus comprising:
- a focus adjustment device that drives to adjust a focal point of an image sensing optical system corresponding to a manual operation;
- and
- a change device that changes a focus adjustment drive speed of said focus adjustment device corresponding to the manual operation in accordance with a cycle in which an image sensing device converts an object image received via the image sensing optical system into an image signal.
A focus adjustment apparatus comprising:
- a focus adjustment device that drives to adjust a focal point of an image sensing optical system correspondig to a manual operation;
- and
- a change device that changes a response time of said focus adjustment device to the manual operation in accordance with a cycle in which an image sensing device converts an object image received via the image sensing optical system into an image signal.
A focus adjustment method for driving to adjust a focal point of an image sensing optical system corresponding to a manual operation, comprising the step of:
- changing a focus adjustment drive speed corresponding to the manual operation in accordance with a cycle in which an image sensing device converts an object image received via the image sensing optical system into an image signal.
A focus adjustment method for driving to adjust a focal point of an image sensing optical system corresponding to a manual operation, comprising the step of:
- changing a focus adjustment drive time corresponding to the manual operation in accordance with a cycle in which an image sensing device converts an object image received via the image sensing optical system into an image signal.
A control program for a focus adjustment apparatus for driving to adjust a focal point of an image sensing optical system corresponding to a manual operation, comprising the step of:
- changing a focus adjustment drive speed corresponding to the manual operation in accordance with a cycle in which an image sensing device converts an object image received via the image sensing optical system into an image signal.
A control program for a focus adjustment apparatus for driving to adjust a focal point of an image sensing optical system corresponding to a manual operation, comprising the step of:
- changing a focus adjustment drive time corresponding to the manual operation in accordance with a cycle in which an image sensing device converts an object image received via the image sensing optical system into an image signal.
Dependencies are inferred from the claim text.