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1. (WO2018221552) CAMERA, ACCESSORY DEVICE, COMMUNICATION CONTROL METHOD, COMPUTER PROGRAM, AND CAMERA SYSTEM

Pub. No.:    WO/2018/221552    International Application No.:    PCT/JP2018/020655
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Thu May 31 01:59:59 CEST 2018
IPC: H04N 5/232
G03B 17/14
G03B 17/56
H04N 5/225
Applicants: CANON KABUSHIKI KAISHA
キヤノン株式会社
Inventors: KAWADA Kazutoshi
河田 一敏
Title: CAMERA, ACCESSORY DEVICE, COMMUNICATION CONTROL METHOD, COMPUTER PROGRAM, AND CAMERA SYSTEM
Abstract:
[Problem] To enable high-speed communication between a camera and a plurality of accessory devices with the accessory devices connected to the camera. [Solution] A camera 200 has a camera control unit 205 which controls communications between the camera and a plurality of accessory devices 100, 300 using a signal transmission channel CS between the camera and the plurality of accessory devices and a data communication channel DATA between the camera and each of the accessory devices. The camera control unit 205 is capable of performing first communication in which data communication is carried out with the plurality of accessory devices and second communication in which data communication is carried out individually with a specific accessory device specified as a communication partner by the first communication, by using the data communication channel. The camera control unit further outputs to the signal transmission channel a signal instructing switch from the first communication to the second communication, performs the first communication at a first communication rate that is commonly applicable to the camera and the plurality of accessory devices, and performs the second communication at a second communication rate that is commonly applicable to the camera and the specified accessory device and that is equal to or higher than the first communication rate.