Abstract: An electronic device includes circuitry and a notification device. The circuitry is configured to: receive an instruction of power supply; supply power in response to the instruction of power supply; and execute an activation program to activate the electronic device, in response to the power supplied. The notification device is configured to provide information indicating that activation of the electronic device is complete, in response to a finish of execution of the activation program. The circuitry is configured to continue or stop supplying the power depending on whether the circuitry continues receiving the instruction of power supply until the finish of execution of the activation program. The circuitry is configured to continue supplying the power after the finish of execution of the activation program.

Abstract: An image forming apparatus includes a fixing device, and a processor. The fixing device fixes an image formed on a recording medium at a fixing temperature. The fixing device includes a heater to heat the fixing device with power from a power supply. The processor detects a voltage value of the power supply, sets a standby temperature of the fixing device based on the detected voltage value of the power supply, and controls operation of the heater to heat the fixing device from the standby temperature to the fixing temperature in response to receiving an instruction for forming an image.

Abstract: An image forming apparatus includes: a fixing unit configured to heat a recording medium on which a recording agent image is formed by an image forming unit, to fix the recording agent image; and a control unit configured to determine, as an image formation start temperature, a temperature of the fixing unit for making the image forming unit start image formation such that a timing at which the recording medium reaches the fixing unit is matched with a timing at which a temperature of the fixing unit is raised to fixing temperature allowing fixing as a result of starting feeding power from an external power supply to a heating unit configured to heat the fixing unit on the basis of a voltage value of the power, and make the image forming unit start image formation when a temperature of the fixing unit reaches the image formation start temperature.

Abstract: An image forming apparatus includes a fixing device, and a processor. The fixing device fixes an image formed on a recording medium at a fixing temperature. The fixing device includes a heater to heat the fixing device with power from a power supply. The processor detects a voltage value of the power supply, sets a standby temperature of the fixing device based on the detected voltage value of the power supply, and controls operation of the heater to heat the fixing device from the standby temperature to the fixing temperature in response to receiving an instruction for forming an image.

Abstract: An image forming apparatus includes: a fixing unit configured to heat a recording medium on which a recording agent image is formed by an image forming unit, to fix the recording agent image; and a control unit configured to determine, as an image formation start temperature, a temperature of the fixing unit for making the image forming unit start image formation such that a timing at which the recording medium reaches the fixing unit is matched with a timing at which a temperature of the fixing unit is raised to fixing temperature allowing fixing as a result of starting feeding power from an external power supply to a heating unit configured to heat the fixing unit on the basis of a voltage value of the power, and make the image forming unit start image formation when a temperature of the fixing unit reaches the image formation start temperature.

Abstract: A control unit drives a driving unit for a correction driving time to supply toner to a developing unit from a toner supplying unit, when a detecting unit detects that an amount of toner stored in the developing unit is equal to or less than a threshold value. A calculating unit calculates an amount of toner consumption from when the toner is supplied to the developing unit to when the detecting unit detects that the amount of the toner stored in the developing unit is equal to or less than the threshold value. The control unit calculates a unit amount of toner supply from the correction driving time and the amount of toner consumption, and supplies the toner to the developing unit by driving the driving unit on the basis of the calculated unit amount of toner supply.

Abstract: A control unit drives a driving unit for a correction driving time to supply toner to a developing unit from a toner supplying unit, when a detecting unit detects that an amount of toner stored in the developing unit is equal to or less than a threshold value. A calculating unit calculates an amount of toner consumption from when the toner is supplied to the developing unit to when the detecting unit detects that the amount of the toner stored in the developing unit is equal to or less than the threshold value. The control unit calculates a unit amount of toner supply from the correction driving time and the amount of toner consumption, and supplies the toner to the developing unit by driving the driving unit on the basis of the calculated unit amount of toner supply.

Abstract: A color-shift correction image is formed in a density D and it is determined whether the color-shift correction image can be detected successfully. If the color-shift correction image can be detected successfully, then the density is decreased. If the color-shift correction image can not be detected successfully, then the density is increased. In this manner, the minimum density is determined.

Abstract: A tandem-type image forming apparatus includes a toner mark pattern forming unit configured to form a toner mark pattern; a sensor configured to detect the toner mark pattern; a first determining unit configured to determine presence or absence of color misregistration based on the detected result; and a color misregistration correcting unit configured to correct the color misregistration based on the determined result. The toner mark pattern includes paired toner marks disposed at different coordinates in the sub-scanning direction. One of the paired toner marks has their ends at different coordinates in the main scanning direction with respect to those of the other one. The first determining unit determines the presence or absence of the color misregistration in the main scanning direction based on the result of the detection of the paired toner marks.

Abstract: A disclosed image forming apparatus for detecting position displacement patterns and correcting position displacement of an image forming position in a main scanning direction according to the detection result, includes a position displacement amount calculating part configured to calculate the amount of the position displacement according to the detection result, a position displacement correcting part configured to correct the position displacement by performing at least one of multiplication correction or multiplication error deviation correction, a correction amount calculating part configured to calculate a multiplication error deviation correction amount for correcting multiplication error deviation generated by the multiplication correction, a first determining part configured to determine whether to plot a first position displacement correction pattern included in the position displacement patterns for performing the multiplication error deviation correction according to the multiplication error devia

Abstract: A tandem-type image forming apparatus includes a toner mark pattern forming unit configured to form a toner mark pattern; a sensor configured to detect the toner mark pattern; a first determining unit configured to determine presence or absence of color misregistration based on the detected result; and a color misregistration correcting unit configured to correct the color misregistration based on the determined result. The toner mark pattern includes paired toner marks disposed at different coordinates in the sub-scanning direction. One of the paired toner marks has their ends at different coordinates in the main scanning direction with respect to those of the other one. The first determining unit determines the presence or absence of the color misregistration in the main scanning direction based on the result of the detection of the paired toner marks.

Abstract: A disclosed image forming apparatus for detecting position displacement patterns and correcting position displacement of an image forming position in a main scanning direction according to the detection result, includes a position displacement amount calculating part configured to calculate the amount of the position displacement according to the detection result, a position displacement correcting part configured to correct the position displacement by performing at least one of multiplication correction or multiplication error deviation correction, a correction amount calculating part configured to calculate a multiplication error deviation correction amount for correcting multiplication error deviation generated by the multiplication correction, a first determining part configured to determine whether to plot a first position displacement correction pattern included in the position displacement patterns for performing the multiplication error deviation correction according to the multiplication error devia

Abstract: A color-shift correction image is formed in a density D and it is determined whether the color-shift correction image can be detected successfully. If the color-shift correction image can be detected successfully, then the density is decreased. If the color-shift correction image can not be detected successfully, then the density is increased. In this manner, the minimum density is determined.

Abstract: A color image forming apparatus includes a first detecting device that detects a first detection objective and generates a pulse signal having a prescribed voltage, and a second detecting device that detects the second detection objective and generates a pulse signal having the same width and a prescribed voltage. A time measuring device measures a time difference between a time when one of the first and second detecting devices firstly generates a pulse signal and a time when the other one of the first and second detecting devices firstly generates a pulse signal after measuring start. A phase calculation device calculates a difference in phase between the monochrome photoconductive member and mono color photoconductive member in accordance with the time difference. Driving speed of one of the first and second driving motors is controlled so that the phase difference decreases to a prescribed level.

Abstract: A color image forming apparatus includes a first detecting device that detects a first detection objective and generates a pulse signal having a prescribed voltage, and a second detecting device that detects the second detection objective and generates a pulse signal having the same width and a prescribed voltage. A time measuring device measures a time difference between a time when one of the first and second detecting devices firstly generates a pulse signal and a time when the other one of the first and second detecting devices firstly generates a pulse signal after measuring start. A phase calculation device calculates a difference in phase between the monochrome photoconductive member and mono color photoconductive member in accordance with the time difference. Driving speed of one of the first and second driving motors is controlled so that the phase difference decreases to a prescribed level.

Abstract: To provide a driver for driving piezoelectric actuators with drastically reduced drive currents during on/off switch control, thereby reducing the power consumption of an overall device. Each of the plural piezoelectric actuators 1a to 1h is composed of a plate and piezoelectric sheets attached to the opposed surfaces of the plate. A positive feeder line 19 or a negative feeder line 21 is connected to the opposite side of each piezoelectric sheet to the side attached to the plate. The controller 27 on-controls the piezoelectric sheets of each of the piezoelectric actuators 1a to 1h by selectively applying a positive or negative drive voltage thereto. Thereafter, the controller 27 turns off the drive voltage applied to the piezoelectric sheets subjected to on-control and simultaneously with this, turns on a drive voltage to the piezoelectric sheets of any other one the piezoelectric electric actuators 1a to 1h to be driven next.