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US 2006/0152806 A1Published application
Variable Magnification Lens Having Image Stabilizing Function
AssigneeCanon Kabushiki Kaisha
InventorsKazuhiro Noguchi, Tadanori Okada
Life of this patent
Estimating the term…
Abstract
An image stabilizer for stabilizing an image against unexpected vibrations or shaking of a zoom lens includes a diaphragm arranged to vary its full-open aperture diameter according to a magnification varying (zooming) action from a wide-angle end position to a telephoto end position of the zoom lens for the purpose of preventing variations in light quantity which more conspicuously take place in the peripheral part than in the central part of an image plane when an image stabilizing action is performed.
Claims11
1-3. (canceled)
An image stabilizer for an image taking lens device, comprising:
- image stabilizing means operative for stabilizing, during shaking of the image taking lens device, the image generated by said image taking lens device;
- an image pickup device disposed at the imaging plane of said image taking lens device and having an imaging area which converts an optical image formed by said image taking lens device into electrical signals, said image pickup device delivering as picture signals the electrical signals derived from the imaging area;
- light quantity correcting means for correcting the light distribution of the image formed by the pixel signals delivered by said image pickup device;
- and
- controlling means for causing said light quantity correcting means to effect a correction of the light quantity distribution during the image stabilizing operation being performed by said image stabilizing means, wherein in the correction said light quantity correcting means is controlled so as to vary a correction amount of light quantity among a plurality of pixels in the imaging area.
2 more elements
6-9. (canceled)
An optical apparatus having an image taking lens device, comprising:
- an image pickup device provided at the imaging plane of said image taking lens device, for converting an optical image formed by said image taking lens device into electrical signals, said image pickup device having a full imaging area and an output imaging area narrower than said full imaging area;
- a sensor for sensing a shaking of said optical apparatus and for producing a shake signal corresponding to the shaking;
- shake correcting means for effecting a correction of image shaking by shifting, in accordance with the shake signal from said sensor, said output imaging area to be read out from said full imaging area of said image pickup device;
- a diaphragm provided in the light path of said image taking lens device;
- and
- controlling means for performing control so as to vary the aperture size of said diaphragm during the correction of the shaking of the image being performed by said shake correcting means, the control comprising varying a full-open aperture diameter of said diaphragm according to a focal length.
3 more elements
An optical apparatus having an image taking lens device, comprising:
- an image pickup device provided at the imaging plane of said image taking lens device, having an imaging area for converting an optical image formed by said image taking lens device into electrical signals, said image pickup device having an output imaging area narrower than the imaging area and delivering the electrical signals from the output imaging area as picture signals;
- a sensor for sensing a shaking of said optical apparatus and for producing a shake signal corresponding to the shaking;
- shake correcting means for effecting a correction of image shaking by shifting, in accordance with the shake signal from said sensor, the output imaging area to be read out from the imaging area of said image pickup device;
- a gain controller for controlling the gains for the pixels of the imaging area of said image pickup device;
- and
- controlling means for controlling a correction amount of light quantity among a plurality of pixels in the output imaging area during the image shaking operation being performed by said shake correcting means.
3 more elements
An optical apparatus having an image taking lens device, comprising:
- a sensor for sensing shaking of said optical apparatus, said sensor outputting a shake signal corresponding to a shaking of said optical apparatus;
- a shake correction lens provided in said image taking lens device, said shake correction lens being movable in directions perpendicular to the optical axis of said image taking lens device;
- an actuator for actuating said shake correction lens in accordance with the shake signal from said sensor;
- an image pickup device provided on the imaging plane of said image taking lens device, for converting an optical image formed by said image taking lens device into electrical signals and delivering the electrical signals as picture signals;
- light quantity correction means for correcting the light quantity distribution of the image to be formed by said picture signals delivered by said image pickup device;
- and
- controlling means for controlling said light quantity correcting means so as to effect a correction of the light quantity distribution when said shake correction lens is being actuated by said actuator.
4 more elements
An optical apparatus having an image taking lens device, comprising:
- a sensor for sensing a shaking of said optical apparatus, said sensor outputting a shake signal corresponding to the shaking;
- a shake correction lens provided in said image taking lens device, said shake correction lens being movable in directions perpendicular to the optical axis of said image taking lens device;
- an actuator for actuating said shake correction lens in accordance with the shake signal from said sensor;
- an image pickup device provided on the imaging plane of said image taking lens device, for converting an optical image formed by said image taking lens device into electrical signals and delivering the electrical signals as picture signals;
- a diaphragm disposed in the light path of said image taking lens device;
- and
- controlling means for performing control so as to vary the aperture size of said diaphragm when said shake correction lens is being actuated by said actuator, such that the aperture size of said diaphragm is smaller when said shake correction lens is being actuated than when said shake correction lens is not being actuated.
4 more elements
An optical apparatus having an image taking lens device, comprising:
- a sensor for sensing a shaking of said optical apparatus, said sensor outputting a shake signal corresponding to the shaking;
- a shake correction lens provided in said image taking lens device, said shake correction lens being movable in directions perpendicular to the optical axis of said image taking lens device;
- an actuator for actuating said shake correction lens in accordance with the shake signal from said sensor;
- an image pickup device provided on the imaging plane of said image taking lens device and having an imaging area for converting an optical image formed by said image taking lens device into electrical signals and delivering the electrical signals from said imaging area as picture signals;
- a gain controller for controlling the gains for the pixels contained in said imaging area of said image pickup device;
- and
- controlling means for controlling, in accordance with the shake signal from said sensor, said gain controller so as to vary the gains for the pixels of said imaging area of said image pickup device when said shake correction lens is being actuated by said actuator.
4 more elements
An image stabilizer for a variable magnification lens, comprising:
- means for stabilizing an image produced by the variable magnification lens during shaking of the variable magnification lens;
- a first diaphragm disposed in an optical path of said variable magnification lens;
- and
- control means for controlling said first diaphragm to vary a full-open aperture diameter of said first diaphragm according to a focal length of said variable magnification lens during stabilizing of the image by said stabilizing means,
- wherein said variable magnification lens has a decentering lens arranged to decenter in a direction perpendicular to an optical axis of said variable magnification lens so as to stabilize an image.
2 more elements
A device comprising a portion of an image stabilizer for a variable magnification lens, comprising:
- a first diaphragm disposed in an optical path of said variable magnification lens;
- and
- control means for controlling said first diaphragm to cause said first diaphragm to limit an on-axial light flux when said variable magnification lens is on a telephoto side,
- wherein said variable magnification lens has a decentering lens arranged to decenter in a direction perpendicular to an optical axis of said variable magnification lens so as to stabilize an image.
1 more element
Dependencies are inferred from the claim text.