Patent ID: 9628653
Date: 2017-04-18
CPC Classifications: H04N

Claim:
1. An image forming apparatus comprising: a facsimile portion that transmits and receives data through a telephone line with an outside; a power supply portion that supplies power to the facsimile portion; and a power supply control portion that is connected to a communication line other than the telephone line and that controls a power supply mode of the power supply portion, wherein when the power supply mode is a normal mode, the power supply portion supplies power to the facsimile portion whereas when the power supply mode is an off mode, the power supply portion stops the supply of power to the facsimile portion, the facsimile portion includes a connection state determination portion that determines, based on a line voltage applied to the telephone line, a state of connection between the telephone line and the facsimile portion, and when the connection state determination portion determines that the connection to the telephone line is disconnected, the power supply control portion controls a transfer to the off mode based on whether or not a notification of information for making a determination as to whether or not the transfer to the off mode is needed is provided from an information output device connected to the image forming apparatus through the communication line, the facsimile portion includes a CPU as a central processing unit, a ROM/RAM for storing data or a program for control, an NVRAM for image accumulation, and a MODEM for connection to the telephone line, the power supply control portion includes a CPU as a central processing unit for controlling supply of power by the power supply portion and a ROM/RAM for storing a program and data for power-saving control or network control, the connection state determination portion is implemented by a CPU, and the power supply portion includes a rectification circuit, a step-up transformer, and a DC/DC converter, generates various types of voltages, and supplies power to the facsimile portion.