| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an accessory capable of performing mounting/dismounting detection of a lens through a simple communication procedure, a camera body, and a camera system. <P>SOLUTION: An accessory includes: a fifth accessory contact to which a signal of a level corresponding to a first truth value is output with respect to a camera body during a period for inhibiting output operation of a first data signal via a third accessory contact and output operation of a second data signal via a fourth accessory contact; and accessory side communication control means which performs input operation of the first data signal from the camera body via the third accessory contact and output operation of the second data signal to the camera body via the fourth accessory contact in synchronization with a clock signal input to a second accessory contact, and controls the duration time during which the signal of a level corresponding to the first truth value is output to the fifth accessory contact to less than a predetermined time when an operation voltage is supplied from the camera body via the first accessory contact. <P>COPYRIGHT: (C)2013,JPO&INPIT |
