Abstract: An image forming apparatus includes a photoreceptor member; a LED head that includes a plurality of light emitting diodes arrayed in a line along a rotating axial direction of said photoreceptor member and that is modulated in response to image signals, so as to expose said photoreceptor member while said photoreceptor member is rotating; a deviation detecting sensor to detect deviations on a circumferential surface of said photoreceptor member; a filter to extract low frequency components including a rotational frequency component of said photoreceptor member from deviation signals detected by said deviation detecting sensor, so as to acquire deviation information with respect to said circumferential surface of said photoreceptor member; a driving section to move said LED head back and forth against said circumferential surface of said photoreceptor member; and a position controlling section to control said driving section, based on said deviation information acquired by said filter, so as to keep a distance

Abstract: In a fixing device of an image forming apparatus including a heating roller and a temperature detecting device spaced apart from the roller, having a first sensor for detecting the surface temperature of the roller, and a second sensor for detecting the ambient temperature, the first sensor being placed at a first position in a casing having an opening through which the heat radiation of the roller is directly incident and the second sensor being enclosed by the casing and placed at a second position to which the heat radiation of the roller is not directly incident, the temperature is calculated on the basis of the outputs of the two sensors, and the opening is disposed so as not to enter a region between the vertical plane containing the central axis of the roller and a tangential plane to the circumferential surface of the roller parallel to the vertical plane.

Abstract: A push button includes a button main body portion which is provided between a packaging substrate placed under it and a casing portion located above it, a light source placed on the packaging substrate, and a light-guide portion which guides light from the light source to an outer periphery of the button main body portion by reflection.

Abstract: An image forming apparatus of the present invention may comprise a power supply system which supplies powers to an image forming unit, a fixing unit, and a general control unit in such a manner that as much power as possible can be supplied to the fixing unit within a limit of a current supplied from an alternating-current power supply, before load fluctuation on a secondary side of a direct-current power supply influences a primary side.

Abstract: An image forming apparatus for performing thermal fixing of toner images, including a fixing section, a heating section, a power supply section and a control section, wherein when the control section controls the power supplying section to start supply of the electric power to the heating section, the control section controls the power supplying section to stop the electric power to the heating section, after a lapse of a predetermined time interval, based on the thermal response characteristic of the temperature detecting section, even when the temperature of the heating section has not yet reached the target fixing temperature.

Abstract: There is described an image forming apparatus, in which the influence of the overall controlling section startup time is reduced, thereby cutting down the time from turning on of power to enabling of image formation. The image forming apparatus includes: a main power switch to turn ON/OFF an AC power source to be supplied into the image forming apparatus; a DC power current generating section to convert AC power current, fed from the AC power source, to DC power current; an overall-controlling section to control overall operations of the image forming apparatus; an engine-controlling section to conduct a predetermined controlling operation among from controlling operations to be conducted in the image forming apparatus; a first power-controlling section, included in the overall-controlling section and/or controlled by the overall-controlling section; and a second power-controlling section, having a starting time shorter than that of the first power-controlling section.

Abstract: An image forming apparatus is disclosed having a fixing unit having a heating device, for heat fixing, a heating power supply section which is connected to the fixing unit to supply electric power supplied from a commercial power supply to the heating device, a voltage detecting section for detecting a value of voltage supplied to the heating power supply section from the commercial power supply, and a control section that stops a supply of electric power to the heating device from the heating power supply section if a first voltage value is smaller than a standard voltage value, while, compares a second voltage value detected by the voltage detecting section after the lapse of the standard time with the standard voltage value, and conducts control to stop operations for image forming if the second voltage value is smaller than the standard voltage value.

Abstract: In a fixing device of an image forming apparatus including a heating roller and a temperature detecting device spaced apart from the roller, having a first sensor for detecting the surface temperature of the roller, and a second sensor for detecting the ambient temperature, the first sensor being placed at a first position in a casing having an opening through which the heat radiation of the roller is directly incident and the second sensor being enclosed by the casing and placed at a second position to which the heat radiation of the roller is not directly incident, the temperature is calculated on the basis of the outputs of the two sensors, and the opening is disposed so as not to enter a region between the vertical plane containing the central axis of the roller and a tangential plane to the circumferential surface of the roller parallel to the vertical plane.

Abstract: A heater control apparatus is provided for controlling a plurality of heaters used for fixing operations of an image forming apparatus, wherein each of the heaters is incorporated inside one of a plurality of rollers. The heater control apparatus includes: a plurality of switching elements to switch flowing paths of electronic currents supplied to the heaters from a common power source; a switching control section to control the switching elements so that a connecting mode of the heaters is changeable between a serial connection mode and a parallel connection mode; and a plurality of temperature detecting devices to detect temperatures of the rollers heated by the heaters, each of the temperature detecting devices corresponding to each of the rollers. The switching control section controls the switching elements so as to change the connecting mode of the heaters according to temperature conditions of the rollers.

Abstract: The invention concerns a heater control apparatus for controlling a plurality of heaters used for fixing operations of image forming apparatus, in which each of the heaters is incorporated in an interior of each of rollers. The heater control apparatus includes: a plurality of switching elements to switch flowing paths of electronic currents supplied to the heaters from a common power source; a switching control section to control the switching elements so that a connecting mode of the heaters is changeable between a serial connection mode and a parallel connection mode; and a plurality of temperature detecting devices to detect temperatures of the rollers heated by the heaters, each of the temperature detecting devices corresponding to each of the rollers. The switching control section controls the switching elements so as to change the connecting mode of the heaters according to temperature conditions of the rollers.

Abstract: An image forming apparatus includes: a writing device for writing an image on the basis of image data thereof; a controller for controlling a writing position in a primary scanning direction by the writing device; a conveying device for conveying a recording material; and a position detecting sensor for detecting an edge of the recording material, which is conveyed by the conveying device in the primary scanning direction as an absolute position. The controller determines the writing position in the primary scanning direction by the writing device on the basis of a position of the edge of the recording material in the primary scanning direction detected by the position detecting sensor, and controls the writing position of the writing device in the primary scanning direction.

Abstract: An image forming apparatus includes: a sheet feeding member for feeding a recording material; an image recording member for recording an image on the recording material; a conveyance path connecting the sheet feeding member and the image recording member, along which the recording material is conveyed; a registration member which is provided in the conveyance path located at the upstream side of the image recording member in the conveyance direction for the recording material, and stops the leading edge of the recording material when being hit by the leading edge, and then, starts conveyance of the recording material; a loop forming member which is provided in the conveyance path located at the upstream side of the registration member in the conveyance direction for the recording material, and forms a loop on the recording material which is stopped by the registration member; a first driving source for driving the registration member; a second driving source for driving the loop forming member; and a drive co