Electronic flash apparatus for camera

摘要

An electronic flash apparatus is capable of discriminating the presence or absence of connection to a camera, and also the state of a connected camera. When the flash apparatus is connected to a camera capable of information transfer, the time required to transfer information is minimal. At least some of the terminals that connect the flash apparatus to the camera perform multiple functions. Different currents are supplied to certain terminals depending upon whether a connected camera is in an information transfer state or a flash photographing state. Terminal voltage detection controls certain functions, including varying certain terminal voltage.