Camera system, camera, and lens apparatus with variable length vibration correction data
First Claim
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1. A camera system including a camera and a lens apparatus detachable from the camera, comprising:
- a communication circuit which communicates data between said camera and said lens apparatus;
a vibration detector provided in said camera, which detects a camera shake;
a camera control circuit provided in said camera, which calculates vibration correction data based on an output from said vibration detector and sends the calculated vibration correction data to said lens apparatus through said communication circuit;
a vibration correction optical member provided in said lens apparatus, which is driven for correcting an image vibration;
a vibration correction driving unit provided in said lens apparatus, which drives said vibration correction optical member; and
a lens control circuit provided in said lens apparatus, which controls said vibration correction driving unit based on the vibration correction data sent from said camera through said communication circuit;
wherein, said camera control circuit sends said vibration correction data with a first data length to said lens apparatus during an image-taking operation of said camera and sends said vibration correction data with a second data length shorter than said first data length to said lens apparatus during an image-taking preparation operation of said camera; and
wherein said lens control circuit controls said vibration correction driving unit based on said vibration correction data with said first data length sent from said camera, converts said vibration correction data with said second data length into data equivalent to said vibration correction data with said first data length and controls said vibration correction driving unit based on the converted vibration correction data.
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Accused Products
Abstract
A camera control circuit of a camera system sends vibration correction data with two different data lengths during image-taking and during image-taking preparation, respectively. The latter data length is shorter. A lens control circuit controls a vibration correction driving unit based on the vibration correction data. The lens control circuit converts vibration correction data with the second data length into data equivalent to vibration correction data with the first data length. Thus, loads on the camera control circuit during image-taking preparation can be reduced while providing image vibration correction inexpensively.
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Citations
6 Claims
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1. A camera system including a camera and a lens apparatus detachable from the camera, comprising:
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a communication circuit which communicates data between said camera and said lens apparatus; a vibration detector provided in said camera, which detects a camera shake; a camera control circuit provided in said camera, which calculates vibration correction data based on an output from said vibration detector and sends the calculated vibration correction data to said lens apparatus through said communication circuit; a vibration correction optical member provided in said lens apparatus, which is driven for correcting an image vibration; a vibration correction driving unit provided in said lens apparatus, which drives said vibration correction optical member; and a lens control circuit provided in said lens apparatus, which controls said vibration correction driving unit based on the vibration correction data sent from said camera through said communication circuit; wherein, said camera control circuit sends said vibration correction data with a first data length to said lens apparatus during an image-taking operation of said camera and sends said vibration correction data with a second data length shorter than said first data length to said lens apparatus during an image-taking preparation operation of said camera; and wherein said lens control circuit controls said vibration correction driving unit based on said vibration correction data with said first data length sent from said camera, converts said vibration correction data with said second data length into data equivalent to said vibration correction data with said first data length and controls said vibration correction driving unit based on the converted vibration correction data.
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2. A camera system including a camera and a lens apparatus detachable from the camera, comprising:
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a communication circuit, which communicates data between said camera and said lens apparatus; a vibration detector provided in said camera, which detects a camera shake; a camera control circuit provided in said camera, which calculates a camera vibration correction data representing the amount of vibration correction based on an output from said vibration detector and sends the calculated vibration correction data to said lens apparatus through said communication circuit; a vibration correction optical member provided in said lens apparatus, which is driven for correcting an image vibration; a vibration correction driving unit provided in said lens apparatus, which drives said vibration correction optical member; and a lens control circuit provided in said lens apparatus, which controls said vibration correction driving unit based on the vibration correction data sent from said camera through said communication circuit; wherein;
said vibration correction data calculated by said camera control circuit is first and second correction data;
said first vibration correction data represents said vibration correction amount in a plurality of bits, one bit unit of said plurality of bits represents a fast minimum correction amount;
said second vibration correction data represents said vibration correction amount in a plurality of bits, one bit unit of said plurality of bits represents a second minimum correction amount larger than said first minimum correction amount;said camera control circuit sends said first vibration correction data to said lens apparatus during art image-taking operation of said camera and sends said second vibration correction data to said lens apparatus during an image-taking preparation operation of said camera; said lens control circuit controls said vibration correction driving unit based on said first vibration correction data sent from said camera, converts said second vibration correction data sent from said camera into data equivalent to said first vibration correction data and controls said vibration correction driving unit based on the converted vibration correction data.
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3. A camera which a lens apparatus can be attached to and detached from, said lens apparatus controlling a drive for a vibration correction optical member based on vibration correction data sent from the camera in order to correct an image vibration, said camera comprising:
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a communication circuit which communicates data between said camera and said lens apparatus; a vibration detector which detects a camera shake; and a camera control circuit which calculates vibration correction data based on an output from said vibration detector and sends the calculated vibration correction data to said lens apparatus through said communication circuit; wherein, said camera control circuit sends said vibration correction data with a first data length to said lens apparatus during an image-taking operation of said camera, and sends said vibration correction data with a second data length shorter than said first data length to said lens apparatus during an image-taking preparation operation of said camera.
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4. A camera which a lens apparatus can be attached to and detached from, said lens apparatus controlling a drive for a vibration correction optical member based on vibration correction data sent from the camera in order to correct an image vibration, said camera comprising:
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a communication circuit which communicates data between said camera and said lens apparatus; a vibration detector which detects a camera shake; and a camera control circuit which calculates vibration said vibration correction data based on an output from said vibration detector and sends the calculated vibration correction data to said lens apparatus through said communication circuit; wherein;
said vibration correction data calculated by said camera control circuit is first and second correction data;said first vibration correction data represents said vibration correction amount in a plurality of bits, one bit unit of said plurality of bits represents a first minimum correction amount; said second vibration correction data represents said vibration correction amount in a plurality of bits, one bit unit of said plurality of bits represents a second minimum correction amount larger than said first minimum correction amount; said camera control circuit sends said first vibration correction data to said lens apparatus during an image-taking operation of said camera and sends said second vibration correction data to said lens apparatus during an image-taking preparation operation of said camera.
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5. A lens apparatus capable of being attached to and detached from a camera, said camera calculating vibration correction data based on an output from a vibration detector that detects vibration due to a camera shake, outputting vibration correction data with a first data length during an image-taking operation, and outputting vibration correction data with a second data length shorter than said first data length during an image-taking preparation operation, said lens apparatus comprising:
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a communication circuit which communicates data between said lens apparatus and said camera; a vibration correction optical member which is driven for correcting an image vibration; a vibration correction driving unit which drives said vibration correction optical member; and a lens control circuit which controls said vibration correction driving unit based on said vibration correction data sent from said camera through said communication circuit; wherein, said lens control circuit controls said vibration correction driving unit based on said vibration correction data with said first data length, said lens control circuit converts said vibration correction data with said second data length into data equivalent to said vibration correction data with said first data length and controls said vibration correction driving unit based on the converted vibration correction data.
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6. A lens apparatus capable of being attached to and detached from a camera, said camera calculating vibration correction data representing the amount of vibration correction based on an output from a vibration detector that detects vibration due to a camera shake, outputting a first vibration correction data during an image-taking operation and outputting a second vibration correction data during an image-taking preparation operation, said first vibration correction data representing said vibration correction amount in a plurality of bit, one bit of which represents a first minimum vibration correction amount, and said second correction data representing said vibration correction amount in a plurality of bit, one bit of which represents a second minimum vibration correction amount larger than said first minimum correction amount, said lens apparatus comprising:
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a communication circuit which communicates data between said lens apparatus and said camera; a vibration correction optical member which is driven for correcting an image vibration; a vibration correction driving unit which drives said vibration correction optical member; and a lens control circuit which controls said vibration correction driving unit based on said vibration correction data sent from said camera through said communication circuit; wherein;
said lens control circuit controls said vibration driving unit based on said first vibration correction data sent from said camera, converts said second vibration correction data sent from said camera into data equivalent to said first vibration correction data and controls said vibration correction driving unit based on the converted vibration correction data.
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Specification