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US 8,265,473 B2Granted
Camera and photographic lens
AssigneeCanon Kabushiki Kaisha
InventorTomokazu Yoshida
Life of this patent
Estimating the term…
Abstract
A camera is provided which is adapted to receive a photographic lens having a diaphragm. The camera includes a detection unit configured to execute electric charge accumulation for detecting a defocus amount when the diaphragm is in a state having a first aperture value, and a controller configured to, when causing the diaphragm to perform an aperture reducing operation from the first aperture value to a second aperture value, cause the diaphragm to start the aperture reducing operation without waiting for completion of the electric charge accumulation for detecting the defocus amount by the detection unit.
Claims7
A camera adapted to receive a photographic lens having a diaphragm, the camera comprising:
- a detection unit configured to execute electric charge accumulation for detecting a defocus amount when the diaphragm is in a state having a first aperture value;
- and
- a controller configured to, when causing the diaphragm to perform an aperture reducing operation from the first aperture value to a second aperture value, cause the diaphragm to start the aperture reducing operation without waiting for completion of the electric charge accumulation for detecting the defocus amount by the detection unit.
A photographic lens comprising:
- a diaphragm unit configured to adjust an amount of light of an object light flux to be directed to an image pickup unit of a camera on which the photographic lens is mounted;
- and
- a diaphragm driving time prediction unit configured to output, to the camera, information on a predicted time period for which the diaphragm unit does not block the object light flux after the diaphragm unit starts an aperture reducing operation from a first aperture value to a second aperture value.
A photographic lens comprising:
- a diaphragm unit configured to adjust an amount of light of an object light flux to be directed to an image pickup unit of a camera on which the photographic lens is mounted;
- and
- a diaphragm driving time prediction unit configured to output, to the camera, information on a predicted time period for which the diaphragm unit does not block the object light flux after the diaphragm unit starts an aperture opening operation from a second aperture value to a first aperture value.
A camera system comprising:
- a camera;
- and
- a photographic lens having a diaphragm, the lens being mountable to the camera;
- wherein the camera includes,
- a detection unit configured to execute electric charge accumulation for detecting a defocus amount when the diaphragm is in a state having a first aperture value;
- and
- a controller configured to, when causing the diaphragm to perform an aperture reducing operation from the first aperture value to a second aperture value, cause the diaphragm to start the aperture reducing operation without waiting for completion of the electric charge accumulation for detecting the defocus amount by the detection unit;
- and
- wherein the photographic includes,
- a diaphragm unit configured to adjust an amount of light of an object light flux to be directed to an image pickup unit of a camera on which the photographic lens is mounted;
- and
- a diaphragm driving time prediction unit configured to output, to the camera, information on a predicted time period for which the diaphragm unit does not block the object light flux after the diaphragm unit starts an aperture reducing operation from a first aperture value to a second aperture value.
9 more elements
A camera system comprising:
- a camera;
- and
- a photographic lens having a diaphragm, the lens being mountable to the camera;
- wherein the camera includes,
- a detection unit configured to execute electric charge accumulation for detecting a defocus amount when the diaphragm is in a state having a first aperture value;
- and
- a controller configured to, when causing the diaphragm to perform an aperture reducing operation from the first aperture value to a second aperture value, cause the diaphragm to start the aperture reducing operation without waiting for completion of the electric charge accumulation for detecting the defocus amount by the detection unit;
- and
- wherein the photographic includes,
- a diaphragm unit configured to adjust an amount of light of an object light flux to be directed to an image pickup unit of a camera on which the photographic lens is mounted;
- and
- a diaphragm driving time prediction unit configured to output, to the camera, information on a predicted time period for which the diaphragm unit does not block the object light flux after the diaphragm unit starts an aperture opening operation from a second aperture value to a first aperture value.
9 more elements
Dependencies are inferred from the claim text.