Abstract: An image forming apparatus includes the following elements. An apparatus body implements plural functions including an image reading function, an image forming function, and a display function in accordance with operations requested by a user. A controller controls first, second, and third power states. An obtaining unit obtains information concerning paper. A first control unit controls the plural functions so that, when the plural functions are returned from the third to the second power state, the display function is returned to the second power state without being synchronized with the other functions and an operation requested by the user is received before the other functions are returned to the second power state. A second control unit controls the other functions so that, if the image forming function is required for executing an operation requested by the user, the operation is executed after the obtaining unit obtains the information concerning paper.

Abstract: An image forming apparatus includes the following elements. An apparatus body implements plural functions including an image reading function, an image forming function, and a display function. A controller controls first, second, and third power states. A first operation unit outputs a transition signal for shifting the states of the image reading function and the image forming function to the second power state. A second operation unit outputs a copy start signal for starting an operation to copy a document. A copy controller controls, when the functions other than the display function are in the third power state, the operation to copy a document in accordance with a copy start signal, and performs control so that another copy start signal is not handled during a period from when controlling of the operation to copy a document has started until when a predetermined specific state is detected.

Abstract: A power converting apparatus having a gate drive circuit including a push-pull circuit consisting of two transistors at its output stage; a diode connected in series with the push-pull circuit; a gate power source connected in parallel with the series circuit of the push-pull circuit and the diode; a negative voltage generating circuit connected in parallel with the push-pull circuit; a transistor connected between the output terminal of the negative voltage generating circuit and the negative terminal of the gate power source, wherein the output voltage of the push-pull circuit is switched from positive polarity to negative polarity and vice versa depending on the signal applied to the base terminals of the transistors.

Abstract: An image forming apparatus includes the following elements. An apparatus body implements plural functions including an image reading function, an image forming function, and a display function. A controller controls first, second, and third power states. A first operation unit outputs a transition signal for shifting the states of the image reading function and the image forming function to the second power state. A second operation unit outputs a copy start signal for starting an operation to copy a document. A copy controller controls, when the functions other than the display function are in the third power state, the operation to copy a document in accordance with a copy start signal, and performs control so that another copy start signal is not handled during a period from when controlling of the operation to copy a document has started until when a predetermined specific state is detected.

Abstract: An image forming apparatus includes the following elements. An apparatus body implements plural functions including an image reading function, an image forming function, and a display function in accordance with operations requested by a user. A controller controls first, second, and third power states. An obtaining unit obtains information concerning paper. A first control unit controls the plural functions so that, when the plural functions are returned from the third to the second power state, the display function is returned to the second power state without being synchronized with the other functions and an operation requested by the user is received before the other functions are returned to the second power state. A second control unit controls the other functions so that, if the image forming function is required for executing an operation requested by the user, the operation is executed after the obtaining unit obtains the information concerning paper.

Abstract: A power converting apparatus having a gate drive circuit including a push-pull circuit consisting of two transistors at its output stage; a diode connected in series with the push-pull circuit; a gate power source connected in parallel with the series circuit of the push-pull circuit and the diode; a negative voltage generating circuit connected in parallel with the push-pull circuit; a transistor connected between the output terminal of the negative voltage generating circuit and the negative terminal of the gate power source, wherein the output voltage of the push-pull circuit is switched from positive polarity to negative polarity and vice versa depending on the signal applied to the base terminals of the transistors.

Abstract: An image forming apparatus includes a detecting unit that detects a size of a document, a scanning unit that scans a document image on the basis of the document size detected by the detecting unit, a storage unit that stores a plurality of image data pieces regarding the document image scanned by the scanning unit, an adding unit that adds, to the image data stored in the storage unit, data to convert an area corresponding to a difference between a size of a printing sheet and the size of the document, into predetermined image, and an image output unit that outputs image data to which data to convert an area corresponding to the difference between the printing sheet size and the document size into predetermined image, has been added by the adding unit onto a printing sheet of a designated size.