Image blur prevention apparatus including device for varying sampling period for sampling an operating signal for image blur prevention device
AssigneeCanon Kabushiki Kaisha
InventorYasuhiko Shiomi
Life of this patent
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Abstract
An image blur prevention apparatus includes a device that varies the sampling period of a signal used in image blur prevention. In an exposure operation, the sampling period is shortened to achieve image blur prevention with high precision (in the exposure operation, image blur prevention with high precision is required). In a non-exposure operation, the sampling period is set to be relativelylong to reduce the load on a calculation circuit (in the non-exposure operation; before exposure, a calculation for determining the exposure conditions is performed, and the load on the calculation circuit becomes great).
Claims10
A camera comprising:
- a blur detection unit that detects blur and outputs a blur signal;
- an image blur prevention device;
- a shutter member that performs an exposure operation onto a recording medium;
- sampling means for sampling the blur signal output by said blur detection unit, and for changing a sampling period for sampling the blur signal before an exposure operation of said shutter member and during the exposure operation;
- and
- driving means for driving said image blur prevention device so as to perform an image blur prevention operation on the basis of the blur signal sampled by said sampling means.
An apparatus adapted to a camera having a shutter member for performing an exposure operation onto a recording medium, said apparatus comprising:
- a blur detection unit that detects blur and outputs a blur signal;
- an image blur prevention device;
- sampling means for sampling the blur signal output by said blur detection unit, for changing a sampling period for sampling the blur signal before an exposure operation of said shutter member, and for changing the sampling period for sampling the blur signal during the exposure operation;
- and
- driving means for driving said image blur prevention device so as to perform an image blur prevention operation on the basis of the blur signal sampled by said sampling means.
A camera controlled by a power supply voltage comprising:
- a blur detection unit that detects blur and outputs a blur signal;
- an image blur prevention device;
- a voltage detection circuit that detects a voltage level of said power supply voltage;
- sampling means for sampling the blur signal output by said blur detection unit, for changing a sampling period for sampling the blur signal when said voltage detection circuit detects that the voltage level is higher than a predetermined value, and for changing the sampling period for sampling the blur signal when said voltage circuit detects that the voltage level is not higher than a predetermined value;
- and
- driving means for driving said image blur prevention device so as to perform an image blur prevention operation on the basis of the blur signal sampled by said sampling means.
A camera having a voltage detection circuit for detecting a voltage level of a power supply voltage, said camera being controlled by said power supply voltage and comprising:
- a blur detection unit that detects blur and outputs a blur signal;
- an image blur prevention device;
- sampling means for sampling the blur signal output by said blur detection unit, for changing a sampling period for sampling the blur signal when the voltage detection circuit detects a voltage level of the power supply voltage is higher than a predetermined value, and for changing the sampling period for sampling the blur signal when the voltage detection circuit detects that the voltage level is not higher than a predetermined value;
- and
- driving means for driving said image blur prevention device so as to perform an image blur prevention operation on the basis of the blur signal sampled by said sampling means.
Dependencies are inferred from the claim text.