Embodiments of the present disclosure provide a control method of an image forming apparatus, an image forming apparatus, and an electronic apparatus. The control method includes detecting whether the image forming apparatus currently satisfies a condition for performing idling; and when the condition for performing the idling is satisfied and before the image forming apparatus starts image formation, enabling the image forming apparatus to perform the idling until a preset time duration is reached for the idling. According to embodiments of the present disclosure, the image forming apparatus is enabled to perform idling for a time duration before starting image formation to mix the moist toner with the non-moist toner, thereby reducing the background gray of printed images and avoiding reduced image quality problem when the moist toner is used to perform printing.

An image forming apparatus is operable in a first small-sheet printing in which power is supplied to the first heat generating element and the second heat generating element and in a second small-sheet printing in which power is supplied to the first heat generating element and the third heat generating element. A first power ratio, which is a proportion of power supplied to the first heat generating element to power supplied to the second heat generating element in the first small-sheet printing, is higher than a second power ratio, which is a proportion of power supplied to the first heat generating element to power supplied to the third heat generating element in the second small-sheet printing.

A power supply device includes a first circuit and a second circuit. The first circuit includes an adjustment unit, a detection unit, a processing unit including a conversion unit, a first communication unit, and a power storage unit. The second circuit includes a second communication unit performing wireless communication with the first communication unit, and a control unit outputting a carrier wave used in the wireless communication. After outputting the carrier wave during a first period, the control unit stops output of the carrier wave during a second period. During the second period, the conversion unit operates on the power stored in the power storage unit. The control unit outputs the carrier wave during a third period after the second period. During the third period, the processing unit transmits information about a conversion result. The control unit controls the adjustment unit based on the transmitted information.

A power supply apparatus includes a transformer including a primary coil, a secondary coil, and an auxiliary coil; a switching element connected in series to the primary coil; a first rectifying/smoothing circuit including a first diode and a first capacitor and configured to rectify and smooth a voltage induced in the auxiliary coil; a second rectifying/smoothing circuit including a second diode and a second capacitor, connected in parallel with the first rectifying/smoothing circuit, and configured to rectify and smooth the voltage induced in the auxiliary coil; and a controller configured to control the switching element. The controller is configured to detect the voltage induced in the auxiliary coil based on an output voltage of the first rectifying/smoothing circuit. A responsiveness of the second diode is better than a responsiveness of the first diode.

The heating apparatus including a plurality of heat generation members including first, second and third generation members, the second heat generation member and the third heat generation member having lengths in a longitudinal direction shorter than a length of the first heat generation member, the heating apparatus including first, second, third, and fourth contacts, and a first switching unit configured to bring an electric path between the second contact and the fourth contact into one of a connecting state and an open state.

The switching circuit includes a first capacitor to which a pulse signal output from a control unit is input, a rectification circuit including at least a first diode and a second diode, the rectification circuit rectifying a voltage input from the first capacitor, and generating a first voltage, and a first switching element including a first terminal, a second terminal and a third terminal, the first voltage generated by the rectification circuit being applied between the first terminal and the second terminal.

An image heating device includes a heater having a plurality of heating elements that heat a plurality of heating regions and a control portion that controls the supply of electric power to the plurality of heating elements. The power supply is controlled so that a first average temperature, which is an average value of control target temperatures of heating regions included in a first region located closer to one end side than a central heating region in a direction orthogonal to a conveying direction of a recording material, and a second average temperature, which is an average value of control target temperatures of heating regions included in a second region located closer to the other end side than the central heating region, are within a predetermined temperature range.

An image control apparatus connected to an image forming apparatus through a network includes one or more controllers having one or more processors and one or more memories. The one or more controllers are configured to receive, through a network, a shutdown instruction issued to the image forming apparatus, and determine whether the image forming apparatus is connected to a second network other than a first network through which the image forming apparatus is connected to the image control apparatus. When the one or more controllers determine that the image forming apparatus is connected to the second network other than the first network, the one or more controllers do not issue the shutdown instruction to the image forming apparatus even when the one or more controllers receive the shutdown instruction through the network.

Printing apparatuses include a photoreceptor adapted to print an image by applying marking material to print media, a fuser adapted to heat the marking material on the print media, and a controller. The controller determines the amount of marking material per unit area of the image before the fuser heats the marking material on the print media. The controller rasterizes the image to produce a bitmap of the image, but the amount of marking material per unit area for the image is determined before completion of rasterization and marking of the image. The controller also adjusts the operating temperature of the fuser to a fusing temperature based on the amount of marking material per unit area of the image, causes the photoreceptor to print the image on the print media using the bitmap of the image, and causes the fuser to fuse the marking material to the print media.

A power source apparatus including: a transformer including a primary coil, a secondary coil, and an auxiliary coil, and has a primary side and a secondary side which are insulated from each other; a rectifier circuit including a first output terminal and a second output terminal; a smoothing capacitor; a switching element; a first series circuit having a capacitor and a first rectification element connected in series; and a second series circuit having a second rectification element and the auxiliary coil connected in series. The number of turns of the auxiliary coil is smaller than the number of turns of the primary coil. A product a ratio between the number of turns of the auxiliary coil and the number of turns of the secondary coil and an output voltage on the secondary side of the transformer is equal to or lower than a voltage of the smoothing capacitor.