Patent ID: 7911530

Claim:
A digital camera connectable to a mobile electronic communication device capable of being driven by a battery, the digital camera comprising: a first battery which provides a supply source of power necessary to operate the digital camera; a connecting unit which electrically connects to the mobile electronic communication device; a power input terminal which receives power supplied from a second battery mounted in the mobile electronic communication device connected via the connecting unit; a power supply selection device which selectively switches a power supply such that power is supplied from one of the first battery and the second battery; a power output terminal capable of supplying power from the first battery to the mobile communication electronic device connected via the connecting unit; a detecting device which detects the power supply selected by the power supply selection device; and a control device which operates to reduce power consumption of the digital camera when the detecting device detects a state where the power is supplied from the second battery to the digital camera, wherein as the operation to reduce the power consumption of the digital camera, the control device performs operations comprising stopping supplying power to an image display device, stopping supplying power to a flash circuit, and reducing a clock operation frequency, wherein the digital camera is a stand-alone digital camera.