Camera accessory and method of transmitting information

Abstract

A camera accessory that is attachable to and detachable from a camera body, includes: a correction optical system that is movable in a direction intersecting an optical axis thereof; and a first communication unit that transmits to the camera body a first information regarding a position of the correction optical system and a second information regarding a vibration of the camera accessory.

1 . A camera accessory that is attachable to and detachable from a camera body, the camera accessory comprising:
 a correction optical system that is movable in a direction intersecting an optical axis thereof;   a first communicator that transmits to the camera body both (i) first information recording a position of the correction optical system and (ii) second information that is different from the first information and that is regarding a vibration detected by the camera accessory.   
     
     
         2 . The camera accessory according to  claim 1 , further comprising
 a second communicator that receives an instruction from the camera body.   
     
     
         3 . The camera accessory according to  claim 1 , wherein
 the first communicator and the second communicator communicate independently of each other.   
     
     
         4 . The camera accessory according to  claim 1 , wherein
 the second communicator receives an instruction to start communication of the first communicator.   
     
     
         5 . The camera accessory according to  claim 1 , wherein
 the second information represents an amount of the vibration on a focusing plane caused by the vibration of the camera accessory.   
     
     
         6 . The camera accessory according to  claim 1 , wherein
 the first communicator repeatedly transmits the first information and the second information to the camera body.   
     
     
         7 . The camera accessory according to  claim 6 , wherein
 the first communicator periodically transmits the first information and the second information in a cycle shorter than a cycle in which the second communicator receives an instruction from the camera body.   
     
     
         8 . The camera accessory according to  claim 2 , wherein:
 the second communicator receives an instruction to start a correction of the vibration; and   the camera accessory further comprises a driver that moves the correction optical system in the direction intersecting the optical axis.   
     
     
         9 . The camera accessory according to  claim 1 , wherein
 the first information relates to a position of the correction optical system in the direction intersecting the optical axis.   
     
     
         10 . The camera accessory according to  claim 9 , wherein
 the first information has a value obtained by converting the position of the correction optical system into a position on the focusing plane.   
     
     
         11 . The camera accessory according to  claim 1 , wherein
 the first communicator periodically transmits a moving state of the correction optical system in the direction intersecting the optical axis to the camera body.   
     
     
         12 . The camera accessory according to  claim 1 , wherein
 the first communicator periodically transmits data of a fixed length including the first information and the second information to the camera body.   
     
     
         13 . The camera accessory according to  claim 1 , comprising
 a vibration detector that detects the vibration and outputs a detected signal, wherein   the vibration detector periodically outputs the detected signal in a cycle shorter than a cycle in which the first communicator transmits the first information and the second information.   
     
     
         14 . The camera accessory according to  claim 13 , wherein
 the first communicator periodically transmits a vibration state judged based on the detected signal from the vibration detector to the camera body.   
     
     
         15 . A camera body that is attachable to a camera accessory which comprises a correction optical system that is movable in a direction intersecting an optical axis, the camera body comprising:
 a first communicator that receives from the camera accessory both (i) first information recording a position of the correction optical system and (ii) second information that is different from the first information and that is regarding a vibration detected by the camera accessory.   
     
     
         16 . A method of transmitting information between a camera accessory that is attachable to and detachable from a camera body and the camera body, the method comprising:
 transmitting, between the camera body and the camera accessory, (i) first information regarding a position of a correction optical system that is movable in a direction intersecting an optical axis thereof and (ii) second information that is different from the first information and that is regarding a vibration of the camera accessory.