A printer includes: a first connector to be used to input electric power supplied from an outside; a second connector to which a communication terminal is to be connected, and which is to be used to output at least a part of the electric power to the connected communication terminal; a printing control unit configured to control operation of a printing unit configured to perform printing on recording paper; and an adjustment unit configured to adjust a maximum amount of the electric power to be output from the second connector, of the electric power supplied from the outside, to a first amount of power when the printing unit is not under a printing operation, and adjust the maximum amount of the electric power to be output from the second connector to a second amount of power when the printing unit is under the printing operation, the second amount of power being smaller than the first amount of power.

An image forming apparatus includes: a thermal head including a plurality of heating elements; and a controller configured to execute a first one-line printing process to perform printing for one line. The first one-line printing process includes: dividing selected R heating elements into M blocks consisting of a 1-st block to an M-th block such that the M blocks include at least one high current block consisting of p heating elements and at least one low current block consisting of q heating elements; and energizing the M blocks at different timings. In a case where the 1-st block is the high current block, at least one block of the M blocks excluding the M-th block is the low current block. In a case where the 1-st block is the low current block, at least one block of the M blocks excluding the M-th block is the high current block.

A device includes an operating portion, a switch and a controller. The device is operable in a first mode in which a predetermined operation is executed and in a second mode of which power consumption is reduced rather than in the first mode, and operates in a state connected to an image forming apparatus. The operating portion operates by an AC voltage supplied from an external power source. The switch supplies the AC voltage to the operating portion in a conductive state and cuts off supply of the AC voltage to the operating portion in a non-conductive state. The controller operates by a DC voltage generated from the AC voltage by a power source provided in the image forming apparatus. The controller controls to cause the switch to be in the non-conductive state so as to stop operation of the operating portion when the device shifts from the first mode to the second mode.

Upon receiving a resumption notification from a system controller, a printer driver determines whether a power supply to a printer apparatus has stopped/resumed after a previous transition instruction to a sleep state was transmitted to the printer apparatus. If stop/resumption is not performed, an initialization negotiation processing performed to the printer apparatus when stop/resumption is not performed.

An image forming apparatus performs a first preparation operation in a full color mode when power is supplied. The apparatus performs, when an image formation request is inputted after the first preparation operation completes, a second preparation operation in a designated color mode in accordance with the image formation request. When an image formation request is inputted during the first preparation operation, the apparatus skips the second preparation operation and performs image formation after the first preparation operation completes.

A image forming apparatus includes a power control unit, an operation mode control unit, and a first timer. The power control unit performs control so as to switch between a normal power state for supplying the operation power supply voltage to the image forming unit, a first power saving state for not supplying the operation power supply voltage to the image forming unit, and a second power saving state having less power consumption than the first power saving state. The operation mode control unit performs control so as to switch a normal mode corresponding to a normal power state, a first power saving mode corresponding to a first power saving state, and a second power saving mode corresponding to a second power saving state.

An image forming apparatus operable in a first power state and a second power state in which power consumption is lower than in the first power state includes a return notification unit that outputs a return notification aggregating return factors in a case where at least one of a plurality of predetermined return factors causing the image forming apparatus to return to the first power state from the second power state has occurred in the second power state, a retaining unit that retains a return factor, and a control unit that returns the image forming apparatus to the first power state from the second power state according to the return notification and acquires the return factor retained by the retaining unit.

A mobile device includes: a drive circuit driven based on power output from a battery; a first coupling portion configured to electrically couple a first battery being an electrolyte battery having a liquid electrolyte as the battery to the drive circuit; and a second coupling portion configured to electrically couple a second battery being an all-solid battery having a solid electrolyte as the battery to the drive circuit.

An image forming apparatus dynamically determines the next communication timing with a server to thereby increase a power saving effect by preventing unnecessary release of the power saving state. The image forming apparatus having a first power state and a second power state in which power is saved more than in the first power state, and having a plurality of functions of periodically communicating with an external apparatus. A remaining time before the image forming apparatus next communicates with the external apparatus is calculated for each of the plurality of functions of periodically communicating with the external apparatus. There is set, in a timer, the shortest one from among the calculated plurality of remaining times. A power state of the image forming apparatus transits from the second power state to the first power state according to the remaining time set in the timer.

An energy saving setting unit controls an image forming apparatus that makes a transition to a power saving state if a transition time passes without any prescribed operation in a normal state, and it includes: a unit for storing specific day information distinguishing a normal operation day and a specific day; an auto pattern updating unit determining the transition time in a normal operation day based on past operational status of the normal operation day of the image forming apparatus; a specific day pattern registering unit receiving and storing setting of the transition time of the specific day; and a switching unit, switching the state of conduction of the image forming apparatus using the transition time determined by the auto pattern updating unit and the stored transition time, on the normal operation day and on the specific day, respectively, based on the specific day information.