BACKGROUND OF THE INVENTION

Field of the Invention

Aspects of the present invention generally relate to an imaging apparatus and an accessory each of which includes a mount including terminals which are able to electrically connect to another apparatus.

Description of the Related Art

A known accessory (camera accessory) which is attachable to and detachable from an imaging apparatus receives the supply of electric power from the imaging apparatus or performs communication of, for example, various instructions and data between the accessory and the imaging apparatus while the accessory is in the state of being mounted to the imaging apparatus. Usually, to enable performing such supplying of electric power and communication, a mounting portion, which is called a mount, used for coupling between the imaging apparatus and the accessory is including a plurality of terminals, which is configured to be electrically connected to other terminals by contact with the other terminals. Then, the plurality of terminals may be used to perform the respective independent communications via different communication systems.

For example, in a technique discussed in Japanese Patent Application Laid-Open No. 2012-078770, a plurality of communication systems independent and different in communication speed is provided, and the arrangement sequence of terminals respectively associated with the plurality of communication systems is determined. Then, in the technique discussed in Japanese Patent Application Laid-Open No. 2012-078770, a terminal associated with a communication system in which the communication speed is high is located near a power source terminal in which there are few changes of current.

SUMMARY OF THE INVENTION

According to an aspect of the present invention, a mount device including a second mount which an accessory including a first mount is attachable to and detachable from includes a plurality of terminals arranged along a circumferential direction of the second mount and used for electrical connection with the accessory, the plurality of terminals including a first terminal which is used to supply driving electric power serving as a first voltage for driving an internal member of the accessory while the accessory is in a state of being mounted to the mount device, and a second terminal which is located adjacent to the first terminal and which exhibits a voltage that changes according to the accessory mounted to the mount device, wherein the second terminal is able to be set to an input state or an output state and is set to the input state during a period in which the driving electric power is not output to the accessory via the first terminal.

Further features of the present invention will become apparent from the following description of embodiments with reference to the attached drawings.

