Abstract: An image forming apparatus forms an image, and includes: an inputter that inputs image data; an image former that executes image forming processing to form an image on a sheet for each page with the image data inputted by the inputter; a controller that controls the image data processed at the image former; and a noise detector that detects noise, wherein the controller controls to perform, at the image former, image re-forming processing for a page corresponding to image data when the noise detector has detected noise when the image data is being processed.

Abstract: An electronic apparatus includes a processor that performs: obtaining first information related to ambient electromagnetic radiation of the electronic apparatus in an environment having at least one other electronic apparatus; and controlling operation of either one or both of the electronic apparatus and the at least one other electronic apparatus with reference to the result of the comparison of a level of ambient electromagnetic radiation of the electronic apparatus to an allowable limit of electromagnetic radiation exposure of the electronic apparatus, the level of ambient electromagnetic radiation being included in the first information obtained by the processor.

Abstract: An electronic apparatus includes a processor that performs: obtaining first information related to ambient electromagnetic radiation of the electronic apparatus in an environment having at least one other electronic apparatus; and controlling operation of either one or both of the electronic apparatus and the at least one other electronic apparatus with reference to the result of the comparison of a level of ambient electromagnetic radiation of the electronic apparatus to an allowable limit of electromagnetic radiation exposure of the electronic apparatus, the level of ambient electromagnetic radiation being included in the first information obtained by the processor.

Abstract: An image forming apparatus: acquires, before start of current supply to electric elements including heater, information indicating rated power of the heater and total consumption power of the electric elements excluding the heater; subtracts the total consumption power from upper power limit of the apparatus, and calculates maximum power not exceeding the rated power and remaining power thus subtracted; obtains duty ratio based on assumption of current supply corresponding to the maximum power according to pulse modulation, and determines whether the duty ratio falls within predetermined range; and controls, when the duty ratio falls within the range, drive circuit to supply alternating current by pulse modulation method, and when the duty ratio falls outside the range, to supply the alternating current by phase control method that temporarily interrupts the supply of the alternating current to the heater in half cycles of the alternating current.

Abstract: An image forming apparatus: acquires, before start of current supply to electric elements including heater, information indicating rated power of the heater and total consumption power of the electric elements excluding the heater; subtracts the total consumption power from upper power limit of the apparatus, and calculates maximum power not exceeding the rated power and remaining power thus subtracted; obtains duty ratio based on assumption of current supply corresponding to the maximum power according to pulse modulation, and determines whether the duty ratio falls within predetermined range; and controls, when the duty ratio falls within the range, drive circuit to supply alternating current by pulse modulation method, and when the duty ratio falls outside the range, to supply the alternating current by phase control method that temporarily interrupts the supply of the alternating current to the heater in half cycles of the alternating current.

Abstract: An image forming apparatus includes an induced voltage detection portion configured to detect an induced voltage Vk in a motor; and an engagement/disengagement completion time detection portion configured to detect an engagement completion time and a disengagement completion time based on the induced voltage Vk detected by the induced voltage detection portion. The engagement completion time is a time at which engagement of a clutch is actually completed. The disengagement completion time is a time at which disengagement of the clutch is actually completed. A control portion determines a command timing based on any one of the engagement completion time and the disengagement completion time detected by the engagement/disengagement completion time detection portion, the command timing being a time at which a command is given to the clutch to perform an engaging operation or a disengaging operation.

Abstract: An image forming apparatus includes an induced voltage detection portion configured to detect an induced voltage Vk in a motor; and an engagement/disengagement completion time detection portion configured to detect an engagement completion time and a disengagement completion time based on the induced voltage Vk detected by the induced voltage detection portion. The engagement completion time is a time at which engagement of a clutch is actually completed. The disengagement completion time is a time at which disengagement of the clutch is actually completed. A control portion determines a command timing based on any one of the engagement completion time and the disengagement completion time detected by the engagement/disengagement completion time detection portion, the command timing being a time at which a command is given to the clutch to perform an engaging operation or a disengaging operation.

Abstract: An image forming apparatus having: a power source applying alternating current voltage to the magnetizing coil; a demagnetizing coil switchable between a conductive state and a cutoff state, and when in the conductive state, cancelling out a portion of a magnetic flux produced by the magnetizing coil; a contact switch and a semiconductor switch electrically connected in parallel, and, in combination, bringing the demagnetizing coil into the conductive state or the cutoff state; and a control unit opening or closing the switches separately. The control unit: opens or closes the semiconductor switch in synchronization with a zero-crossing of the alternating current voltage at least when the contact switch is open; opens or closes the contact switch only when the semiconductor switch is closed; and opens the semiconductor switch when the demagnetizing coil brought into the conductive state by the contact switch needs to be maintained in the conductive state.

Abstract: An image forming apparatus having; an electrostatic latent image support; a charger for charging the electrostatic latent image support; an exposure unit for exposing the electrostatic latent image support with a light beam to form an electrostatic latent image; a development unit for developing the electrostatic latent image into a toner image; a sheet feeding unit for feeding a recording sheet in an image forming operation; a transfer member for transferring the toner image to the recording sheet; a fuser for fusing the toner image onto the recording sheet; and a high-voltage power supply circuit for, in an image forming operation, applying a plurality of bias voltages at least to the charger and to the development unit, wherein the high-voltage power supply circuit supplies a high voltage only to the charger in an operation in an ion generation mode so as to cause the charger to generate ions.

Abstract: An image forming apparatus includes a timing roller for conveying paper in the image forming apparatus, a first motor receiving supply of electric power from a power source for driving the timing roller, a second motor receiving supply of electric power from the power source, a sensor for detecting whether a jam occurs at the conveyance roller, a drive relay for cutting off supply of electric power from the power source to the first and second motors, if occurrence of a jam is detected, and a control circuit for controlling an operating state of the second motor such that regenerative power produced at the first motor due to rotation of the conveyance roller is supplied to the second motor, if occurrence of a jam is detected.

Abstract: An image forming apparatus having: a power source applying alternating current voltage to the magnetizing coil; a demagnetizing coil switchable between a conductive state and a cutoff state, and when in the conductive state, cancelling out a portion of a magnetic flux produced by the magnetizing coil; a contact switch and a semiconductor switch electrically connected in parallel, and, in combination, bringing the demagnetizing coil into the conductive state or the cutoff state; and a control unit opening or closing the switches separately. The control unit: opens or closes the semiconductor switch in synchronization with a zero-crossing of the alternating current voltage at least when the contact switch is open; opens or closes the contact switch only when the semiconductor switch is closed; and opens the semiconductor switch when the demagnetizing coil brought into the conductive state by the contact switch needs to be maintained in the conductive state.

Abstract: An image forming apparatus includes a timing roller for conveying paper in the image forming apparatus, a first motor receiving supply of electric power from a power source for driving the timing roller, a second motor receiving supply of electric power from the power source, a sensor for detecting whether a jam occurs at the conveyance roller, a drive relay for cutting off supply of electric power from the power source to the first and second motors, if occurrence of a jam is detected, and a control circuit for controlling an operating state of the second motor such that regenerative power produced at the first motor due to rotation of the conveyance roller is supplied to the second motor, if occurrence of a jam is detected.

Abstract: A power control method for supplying AC power to a first load and a second load is provided. The method includes supplying, to the first load, AC power corresponding to a range of a phase angle 0 to a phase angle ?1 in each half cycle; and supplying, to the second load, AC power corresponding to a range of a phase angle ?2 to a phase angle ? in each half cycle, wherein ?1 is larger than 0 and not more than ?, ?2 is not less than 0 and smaller than ?, and ?1 is larger than ?2.

Abstract: An image forming apparatus having; an electrostatic latent image support; a charger for charging the electrostatic latent image support; an exposure unit for exposing the electrostatic latent image support with a light beam to form an electrostatic latent image; a development unit for developing the electrostatic latent image into a toner image; a sheet feeding unit for feeding a recording sheet in an image forming operation; a transfer member for transferring the toner image to the recording sheet; a fuser for fusing the toner image onto the recording sheet; and a high-voltage power supply circuit for, in an image forming operation, applying a plurality of bias voltages at least to the charger and to the development unit, wherein the high-voltage power supply circuit supplies a high voltage only to the charger in an operation in an ion generation mode so as to cause the charger to generate ions.

Abstract: A power control method for supplying AC power to a first load and a second load is provided. The method includes supplying, to the first load, AC power corresponding to a range of a phase angle 0 to a phase angle ?1 in each half cycle; and supplying, to the second load, AC power corresponding to a range of a phase angle ?2 to a phase angle ? in each half cycle, wherein ?1 is larger than 0 and not more than ?, ?2 is not less than 0 and smaller than ?, and ?1 is larger than ?2.

Abstract: In a body supporting another body via a land into which sealing gas is supplied via an in-coming gas groove or grooves for liquid sealing purpose and from which fluid is discharged through a fluid groove, one or more sets of out-going gas grooves are formed opening to the land in between the in-coming gas groove(s) and the fluid groove so that both undesirable mixing of the sealing gas with the fluid and accidental invasion of outside dust or the like into the arrangement is effectively prevented.

Abstract: In a body supporting another body via a land into which sealing gas is supplied via an in-coming gas groove or grooves for liquid sealing purpose and from which fluid is discharged through a fluid groove, one or more sets of out-going gas grooves are formed opening to the land in between the in-coming gas groove(s) and the fluid groove so that both undesirable mixing of the sealing gas with the fluid and accidental invasion of outside dust or the like into the arrangement is effectively prevented.