Power required for a printing operation can be supplied while supplying power to a connected external device. A printer 1 connects to a smart device 2, and has: a power circuit 14; a USB interface 15 capable of supplying power to the smart device while communicating by wire with the smart device 2; a print unit 16 that prints; and a controller 11 that controls the print unit 16 to print in a power conservation mode when information instructing printing by the print unit 16 is received by the interface 15 from the smart device 2 while supplying power from the power circuit 14 to the smart device 2.

There is provided an ink-jet printer, including: a conveyor; a carriage; a recording head; a sensor; a cap; a cap shifter; a reference wall; a memory; a power supply; a command receiver; and a controller. The controller is configured to execute judging a state of the power supply section; changing a relative position of the recording head and the cap from the covering position to the separated position to take the cap off the recording head; switching the power supply from the sleep state to the drive state, changing a relative position of the recording head and the cap from the covering position to the separated position by taking the cap off the recording head, storing in the memory the position information, and recording an image on the sheet conveyed to the sheet facing area.

There is provided an ink-jet printer, including: a conveyor; a carriage; a recording head; a sensor; a cap; a cap shifter; a reference wall; a memory; a power supply; a command receiver; and a controller. The controller is configured to execute judging a state of the power supply section; changing a relative position of the recording head and the cap from the covering position to the separated position to take the cap off the recording head; switching the power supply from the sleep state to the drive state, changing a relative position of the recording head and the cap from the covering position to the separated position by taking the cap off the recording head, storing in the memory the position information, and recording an image on the sheet conveyed to the sheet facing area.

An image forming apparatus having a plurality of functional units includes a power failure detection circuit configured to detect a power failure of an external power supply for the image forming apparatus, a rechargeable battery unit, and a control unit. The control unit switches the power supply source of the image forming apparatus from the external power supply to the rechargeable battery unit, and selects one or more of the functional units to power through the rechargeable battery unit based on a remaining capacity of the rechargeable battery unit, when the power failure of the external power supply is detected.

An image forming apparatus having a plurality of functional units includes a power failure detection circuit configured to detect a power failure of an external power supply for the image forming apparatus, a rechargeable battery unit, and a control unit. The control unit switches the power supply source of the image forming apparatus from the external power supply to the rechargeable battery unit, and selects one or more of the functional units to power through the rechargeable battery unit based on a remaining capacity of the rechargeable battery unit, when the power failure of the external power supply is detected.

An image forming apparatus having a plurality of functional units includes a power failure detection circuit configured to detect a power failure of an external power supply for the image forming apparatus, a rechargeable battery unit, and a control unit. The control unit switches the power supply source of the image forming apparatus from the external power supply to the rechargeable battery unit, and selects one or more of the functional units to power through the rechargeable battery unit based on a remaining capacity of the rechargeable battery unit, when the power failure of the external power supply is detected.

A printing apparatus that has a plurality of functions including a printing function and is capable of executing printing with resolution of 300 dpi or more includes a plurality of operating units including a printing unit and a power supply unit. The power supply unit includes a substrate, an input terminal that receives an alternating voltage, a smoothing capacitor that smooths the alternating voltage, a thermistor that detects a temperature, and a comparator that compares a signal output from the thermistor with a standard signal and outputs a notification signal. The input terminal, the smoothing capacitor, the thermistor, and the comparator are mounted on the substrate. The supply of power from the power supply unit is stopped based on the state of the notification signal. A gap between the input terminal and the thermistor is longer than a gap between the input terminal and the smoothing capacitor.

A printing apparatus that has a plurality of functions including a printing function and is capable of executing printing with resolution of 300 dpi or more includes a plurality of operating units including a printing unit and a power supply unit. The power supply unit includes a substrate, an input terminal that receives an alternating voltage, a smoothing capacitor that smooths the alternating voltage, a thermistor that detects a temperature, and a comparator that compares a signal output from the thermistor with a standard signal and outputs a notification signal. The input terminal, the smoothing capacitor, the thermistor, and the comparator are mounted on the substrate. The supply of power from the power supply unit is stopped based on the state of the notification signal. A gap between the input terminal and the thermistor is longer than a gap between the input terminal and the smoothing capacitor.

In a conventional current resonance switching power source, the burst period of a burst operation could not be sufficiently prolonged, and the efficiency characteristics were insufficient in a light load. In order to improve this, an embodiment of the present invention generates, upon operating in the burst mode, a control signal in accordance with a comparison result of a first reference voltage and a secondary side voltage of a transformer and a comparison result of a second reference voltage and the secondary side voltage of the transformer. Subsequently, the oscillation operation timing of an oscillator that performs an oscillation operation to the transformer and the oscillation frequency that changes the voltage excited on the secondary side of the transformer are controlled based on the control signal.

In a conventional current resonance switching power source, the burst period of a burst operation could not be sufficiently prolonged, and the efficiency characteristics were insufficient in a light load. In order to improve this, an embodiment of the present invention generates, upon operating in the burst mode, a control signal in accordance with a comparison result of a first reference voltage and a secondary side voltage of a transformer and a comparison result of a second reference voltage and the secondary side voltage of the transformer. Subsequently, the oscillation operation timing of an oscillator that performs an oscillation operation to the transformer and the oscillation frequency that changes the voltage excited on the secondary side of the transformer are controlled based on the control signal.