Camera system, camera, and lens apparatus

• US 20030007075A1
• Filed: 06/14/2002
• Published: 01/09/2003
• Est. Priority Date: 06/18/2001
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Masuda, Kazunori
• Granted Patent: US 7,057,644 B2
• Time in Patent Office: Days
• US Class Current: 348/208.11
• CPC Class Codes: H04N 23/663 for controlling interchangeable camera parts based on electronic image sensor signals
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

There is disclosed a camera system including: optical member a camera control circuit which sends a vibration correction data with a first data length to a lens apparatus during an image-taking operation and sends a vibration correction data with a second data length shorter than the first data length to the lens apparatus during an image-taking preparation operation; a lens control circuit which controls a vibration correction driving unit based on the vibration correction data with the first data length, converts the vibration correction data with the second data length into data equivalent to vibration correction data with the first data length and controls the vibration correction driving unit based on the converted vibration correction data.

Thus, loads on the camera control circuit during the image-taking preparation operation can be reduced, and proper image vibration correction can be performed with an inexpensive configuration.

Claims

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 defects 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.

2. 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 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 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;

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.

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:

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.

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:

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.

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 during an image-taking preparation operation, said lens apparatus comprising:

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 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.

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:

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.