Abstract: An exposure device includes a mirror to reflect light used for exposure of an object, a holder to hold the mirror, an adhesive that bonds the mirror to the holder and elastically deforms, and an adjusting tool that pushes the mirror to change a direction of the mirror.

Abstract: An image forming apparatus including: a light scanning portion that lights a plurality of beams, and scans a surface to be scanned of an image carrier to form an electrostatic latent image; a detection portion that detects at least one lighted beam; an abnormality detection portion that transmits data to the light scanning portion via a transmission-line, causes the light scanning portion to light a beam, and detects abnormality of the transmission-line based on the detected beam; and a setting portion that sets a number of beams to be lighted in the case of the formation of the electrostatic latent image so that an amount of light of the detected beam in the case of abnormality detection of the transmission-line is equal to or more than a minimum amount of light of the detected beam in the case of the formation of the electrostatic latent image.

Abstract: A semiconductor laser driver to drive a semiconductor laser, the semiconductor laser includes a drive circuit to generate a drive current to cause the semiconductor laser to emit, and a current control circuit to cause the driving current to repeatedly increase and decrease in a predetermined cycle.

Abstract: A drive circuit is provided for supplying a drive current to drive a plurality of driven elements each having two main electrodes. The drive circuit includes a switch circuit for receiving a drive signal; and a constant current circuit connected to the switch circuit for adjusting the drive current at a constant level. The constant current circuit is formed of a depletion type MOS transistor.

Abstract: A pulsed electric operating current that rises during a pulse duration is generated for operating at least one radiation-emitting semiconductor component. For this purpose, in a method for producing a control device for operating the at least one radiation-emitting semiconductor component, a temporal profile of a thermal impedance representative of the at least one radiation-emitting semiconductor component is determined. A profile of the electric operating current that is to be set is determined depending on the determined temporal profile of the thermal impedance. The control device is furthermore designed such that the profile of the operating current that is to be set is set in each case during the pulse duration.

Abstract: The invention provides an exposure apparatus having a configuration such that, when a single laser light source having a plurality of light-emitting points is driven by a plurality of laser control apparatuses, mutual monitoring of the control state of the respective laser control apparatuses is possible, thus reducing malfunctions due to the effects of noise, and also provides a method to control this exposure apparatus, and an image forming apparatus. To accomplish this, the exposure apparatus does not execute light amount control of the light source to be driven when the determination unit has determined that another driving unit is causing the light source to be driven to emit light, and executes the light amount control of the light source to be driven when the determination unit has determined that another driving unit is not causing the light source to be driven to emit light.

Abstract: An optical writing apparatus includes a light source device that includes a VCSEL having an alignment of at least two channels in a sub scanning direction configured to emit plural light beams in a block. A deflector deflects the plural light beams toward an image bearer that forms an image by changing a line speed of image formation. A control device decreases a number of light beams by turning off a prescribed same number of the channels symmetrically from the both ends of the alignment in accordance with the line speed.

Abstract: A light emitting apparatus includes a plurality of light emitting chips, a first wire, a second wire, a third wire, and a fourth wire. The plurality of light emitting chips each have a plurality of light emitting devices and are divided into a plurality of chip groups, the light emitting devices in each of the light emitting chips being divided into a plurality of device groups. The first wire transmits in common a transmission signal to the light emitting chips. The second wire transmits in common a first selection signal to a given chip group of the light emitting chips. The third wire transmits in common a second selection signal to a set of the device groups. The fourth wire transmits a turn-on control signal to each of the chip groups.

Abstract: An information processing apparatus generates a scanning instruction to send to a device for forming visible information by scanning a recording medium with a laser beam. The information processing apparatus includes an extracting unit for reading line information in which a scanning speed and a radiation output value of the laser beam are registered in advance for each line, and extracting all lines which are overlapping a target line in a line direction and positioned within a predetermined distance from the target line; and an adjusting unit for performing at least one of removing an extracted line from a scanning object, changing the radiation output value of an extracted line to a value lower than an initial value, and changing the scanning speed of an extracted line to a value greater than an initial value.

Abstract: A pixel clock generator includes a frequency divider 4 that generates a pixel clock PCLK based on a high frequency clock VCLK, a comparator 5 that calculates an error Lerr in the time obtained by integrating a cycle of the pixel clock PCLK for a target number RefN from a time when synchronization signals SPSYNC and EPSYNC are detected, a filter 6, and a frequency calculating unit 7 that sets a frequency dividing value M of the frequency divider 4. The filter 6 and the frequency calculating unit 7 calculate an average of a frequency of the pixel clock PCLK based on the error Lerr, determine a reference error value from the error Lerr in N-cycles, calculate offset values of the frequencies of N pieces of pixel clocks PCLK based on a difference between the reference error value and the error Lerr, and calculate the frequency dividing value M based on a result obtained by adding the circularly selected offset values and the average of the frequency of the pixel clock PCLK.

Abstract: An optical writing device forms an electrostatic latent image on a photosensitive element by a connected light source controlled by a light source control circuit that includes: a pixel data output unit; a pixel data correcting unit that corrects a skew between main scanning line of electrostatic latent image and photosensitive element and a local deviation of the electrostatic latent image on the main scanning line, and outputs pixel data; a pattern generating unit that outputs pixel data for forming a predetermined pattern in an electrostatic latent image; a first light source control unit for causing a first light source, that needs correction of the local deviation, to emit light; a second light source control unit for causing a second light source, that does not need correction of the local deviation, to emit light; and a switch that switches between a first transmission status and a second transmission status.

Abstract: A light emitting control device for a light emitting diode print head includes a control unit, a pulse-mask unit, a strobe unit and a data output unit. The pulse-mask unit outputs n clock signals in sequence to a light emitting diode print head. The strobe unit outputs a strobe signal to the light emitting diode print head, so as to switch on the light emitting diode print head. The data output unit outputs a print data signal to the light emitting diode print head. When the pulse-mask unit outputs a k-th clock signal of the n clock signals, the pulse-mask unit delays the k-th clock signal for a predetermined time, and the data output unit pauses outputting the print data signal. After the predetermined time, the pulse-mask unit and the data output unit continue to output the rest of the clock signals and the print data signal.

Abstract: An image reading apparatus capable of reading documents includes a reading unit including a light emitting element, a mechanism configured to move the reading unit, and a control unit configured to control the reading unit and the mechanism both to carry out reading by turning on the light emitting element and moving the reading unit and to temporarily stop moving the reading unit upon occurrence of a predetermined factor. The control unit sets a first current value which is caused to flow through the light emitting element when reading is carried out and sets a second current value which is less than the first current value and which is caused to flow through the light emitting element when the reading unit is temporarily stopped.

Abstract: An image forming apparatus includes: a light source; a light-source driving unit; a photosensitive member including an image forming region; a determining unit determining a level of a rotation speed of the photosensitive member; a scanner unit exposing the photosensitive member by deflecting the light beam from the light source by a deflecting unit; a sensor receiving the light beam and outputs a detection signal; and a control unit controlling the image forming apparatus based on the detection signal output from the sensor. When the determining unit determines that the rotation speed is low, the light-source driving unit is configured to drive the light source to emit the light beam when a deflecting direction of the light beam is oriented toward the sensor and not to drive the light source to emit the light beam when the deflecting direction of the light beam is oriented toward the image forming region.

Abstract: The image forming apparatus includes a video controller unit that receives image information to convert the image information into an image signal for image formation, an engine controller unit that controls image formation, a laser driver unit that emits a laser beam, and a plurality of signal lines that connect the video controller unit, the engine controller unit, and the laser driver unit to each other, wherein the laser driver unit detects the laser beam emitted from the illumination element and generates a horizontal synchronization signal which is electrically transmitted via any one of the plurality of signal lines and used as the reference of an image writing timing in response to the detection. Among the signal lines, a signal line for transmitting the image signal or a control signal electrically and a signal line for electrically transmitting the horizontal synchronization signal are used as a common signal line.

Abstract: A driving device controls light emitting thyristors that each include a scanning circuit sequentially driving each of the plural stages of the light emitting thyristors by controlling scanning thyristors. Herein, terminals of each odd numbered stage of the scanning thyristors is commonly connected to a first clock terminal, and terminals of each even numbered stage of the scanning thyristors is commonly connected to a second clock terminal. A control terminal of a first stage scanning thyristor is connected to the second clock terminal, and another control terminal of a previous scanning thyristor is connected to the second control terminal of a subsequent scanning thyristor.

Abstract: An image forming apparatus, which forms an image by forming an electrostatic latent image on a photosensitive member with a laser beam, developing the electrostatic latent image with a developer to obtain a developer image, and transferring the developer image to a sheet, includes a light source which outputs the laser beam for exposing the photosensitive member; a PLL circuit which generates a multiplied clock that is obtained by multiplying a reference clock; a pulse-width modulating circuit which outputs a pulse-width-modulated signal based on image data and the multiplied clock in order to drive the light source; and a CPU which obtains image data to be input to the pulse-width modulating circuit and, when it is unnecessary to output the pulse-width-modulated signal based on the obtained image data, controls the PLL circuit so as not to generate the multiplied clock.

Abstract: A light scanning apparatus including: a light source to emit a laser beam; a light source driving unit to turn on and off the light source according to image data and a pixel clock; a rotary polygon mirror to deflect the light beam; a motor to rotationally drive the rotary polygon mirror; and a control unit to control a rotary speed of the motor to generate an acceleration control signal for accelerating the rotary speed and a deceleration control signal for decelerating the rotary speed, wherein for the acceleration control signal, the driving unit corrects the frequency of the pixel clock to be higher than the frequency, which is before the acceleration control, and for the deceleration control signal, the driving unit corrects the frequency of the pixel clock to be lower than the frequency, which is before the deceleration control.

Abstract: An exposure device includes a long board, plural light emitting elements arranged along a longitudinal direction of the board on one face of the board, plural inspection electrodes arranged along the longitudinal direction of the board on the other face of the board, and plural electrical wirings each electrically connects between one of the plural light emitting elements and one of the plural inspection electrodes that is not positioned nearest to the one of the plural light emitting elements.

Abstract: There is provided a recording medium imaging device capable of properly selecting pixels used for determining the kind of the recording medium from the captured surface image to remove pixels from which the surface property of the recording medium cannot be properly determined because the pixels extremely high in light quantity are affected by some sort of dirt or scratches in determining the kind of a recording medium. This allows the determination of kind of the recording medium based on the normally captured surface image to reduce the decrease in accuracy in determining the kind of the recording medium.

Abstract: An image forming apparatus includes an optical scanning unit, a measurement unit, a first adjustment unit and a second adjustment unit. The optical scanning unit includes a plurality of light sources to emit laser beams, a single oscillating mirror deflector to deflect the laser beams used for scan processing in a main scanning direction, and a scan-focusing member to focus the deflected laser beams onto a plurality of photoconductors. The measurement unit measures a resonance frequency of the oscillating mirror deflector. The first adjustment unit adjusts a speed of the photoconductors in a sub-scanning direction. The second adjustment unit adjusts a magnification ratio of image data in the sub-scanning direction. The first adjustment unit and the second adjustment unit adjust the image magnification ratio of image data in the sub-scanning direction depending on the resonance frequency as measured by the measurement unit.

Abstract: An image forming apparatus including; an exposure section provided with, a light emitting element, a polygon mirror to receive light beams from the light emitting element, and to expose an image carrier using light beam via the polygon mirror based on image data; an image processing section to adjust image magnification by image processing of the image data; and, a control section configured to select at least either of a first magnification adjustment to change a rotation speed of the polygon mirror and a second magnification adjustment to carry out image processing of the image data by the image processing section, based on comparison results between a paper interval time during recording paper conveyance in image formation and the first magnification adjustment time required to stabilize polygon mirror rotation in the first magnification adjustment, when adjusting image magnification with respect to recording paper.

Abstract: An exposure device for exposing a photoreceptor, includes: data electrodes disposed for each of a plurality of columns parallel to a moving direction of the photoreceptor; selected electrodes disposed for each of a plurality of rows perpendicular to each of the data electrodes; light emitting element arrays including light emitting elements disposed near intersection points between the data electrodes and the selected electrodes in intersections between the data electrodes and the selected electrodes, the light emitting elements being linearly arrayed; a driving signal output circuit for generating a driving signal based on an image signal to supply the driving signal to the light emitting element arrays; and a column selection unit for switching the light emitting element arrays to be selected based on a lighting situation of each of the light emitting elements of each of the light emitting element arrays.

Abstract: A deflector deflects a light beam emitted from a light source including a plurality of light-emitting units. A scanning optical system focuses the light beam deflected by the deflector on a scanning target surface. A monitoring photoreceiver receives a part of a light beam deflected by the deflector and directed toward an area within a scanning area outside an image area. A detecting unit individually detects emission powers of at least two light-emitting units based on an output signal of the monitoring photoreceiver in a single sweep of scanning.

Abstract: According to one embodiment, when performing monochrome image forming, image processing circuits for color image forming, laser control circuits for the color image forming and data processing circuits for the color image forming in an integrated circuit are not operated.

Abstract: A light-emitting device includes: a circuit board including at least two of signal interconnection layers each having plural signal interconnections, at least adjacent two of the signal interconnection layers including signal interconnections provided so that center positions of the respective signal interconnections in a direction intersecting with a longitudinal direction are displaced from each other in portions of the signal interconnections provided in the longitudinal direction; and plural light-emitting chips each having plural light-emitting elements, the light-emitting chips being arrayed in line in the longitudinal direction on a surface of the circuit board.

Abstract: An exposure device configured to perform exposure using a plurality of light beams and capable of stabilizing image density without increasing circuit size. The exposure device has a first light source for emitting a first light beam and a second light source for emitting a second light beam. The exposure device exposes a photosensitive drum such that areas exposed to the respective first and second light beams at least partially overlap each other. A first drive current having a predetermined value and a second drive current are supplied to the respective first and second light sources. A photodiode detects the intensities of the respective first and second light beams or the sum of the intensities. The second drive current is controlled based on a detection result from the photodiode such that the sum of the intensities becomes equal to a target intensity.

Abstract: A pixel information acquiring unit acquires multilevel pixel information in which one pixel is expressed in multilevel scales. A line pixel information storing unit stores the multilevel pixel information for each main scanning line. A light emission control unit optically exposes a photosensitive element by controlling a binary light source on the basis of the multilevel pixel information. The photosensitive element is exposed to the binary light source with a period corresponding to N-fold in a sub scanning direction resolution of the multilevel pixel information, wherein N is a positive integer, so that the N times exposures corresponds to an exposure for one pixel in an original resolution. The switch on/off statuses of the binary light source are controlled in the N times exposures for each pixel, on the basis of lighting rate information for converting the multilevel scales into a lighting rate in the N times exposures.

Abstract: Methods, algorithms, software, apparatuses and systems for processing image data for imaging devices having irregular scan paths (e.g., scan paths that deviate from a conventional horizontal and/or straight line). The irregular scan paths generally correspond to actual locations of a line of output from an image output device (e.g., a printer). The method generally includes steps of selecting one or more of the input pixels, correlating a location of the selected pixel with a location on an irregular scan path, and producing an adjusted pixel based on a value of the selected pixel, the location on the irregular scan path, and/or values of one or more pixels near the selected pixel.

Abstract: Disclosed is an oscillator device that includes an oscillating system having a first oscillator, a second oscillator, a first torsion spring for connecting the first and second oscillators each other, and a second torsion spring being connected to the second oscillator and having a common torsional axis with the first torsion spring; a supporting system for supporting the oscillating system; a driving system for driving the oscillating system so that at least one of the first and second oscillators produces oscillation as can be expressed by an equation that contains a sum of a plurality of time functions; a signal producing system for producing an output signal corresponding to displacement of at least one of the first and second oscillators; and a drive control system for controlling the driving system on the basis of the output signal of the signal producing system so that at least one of amplitude and phase of the time function takes a predetermined value.

Abstract: A light source control apparatus which controls, based on image data input, light emission of a light source which forms an electrostatic latent image on an image bearing body in an electrophotographic image forming apparatus is disclosed, including a pattern generating unit which generates an internal pattern for position aligning and concentration correcting according to the image data; and a mirroring processing unit which performs a process of mirroring the image data and the internal pattern at a later stage of the pattern generating unit.

Abstract: An optical writer includes a scanning part causing a light beam from a light source to perform scanning on a photosensitive body; an image information obtaining part obtaining image information of an image; a dithering information obtaining part obtaining dithering information of the image; a pixel clock generating part generating a pixel clock signal; and a light emission control part to control the light source based on the image information in accordance with the pixel clock signal. The pixel clock generating part modulates the clock frequency of the pixel clock signal in accordance with phase shift information for correcting a change in the speed of the scanning on main scanning lines on the photosensitive body, and determines the timing of modulating the clock frequency based on the dithering information on a main scanning line basis so that the timing of modulating the clock frequency differs between the main scanning lines.

Abstract: An exposure device includes a plurality of light-emitting elements, a lighting driver, a first storage, a reader, a shading correction unit and a second storage. The lighting driver drives and lights up the light-emitting elements based on image data. The first storage stores light amount unevenness correction values of the respective light-emitting elements. The reader reads the light amount unevenness correction values stored in the first storage. The shading correction unit executes shading correction for the light amount unevenness correction values read by the reader. The second storage stores correction values obtained by having the shading correction unit to execute the shading correction for the light amount unevenness correction values. The lighting driver controls light power of the respective light-emitting elements based on the correction values stored in the second storage.

Abstract: An image forming apparatus which is capable of properly correcting a scanning length while suppressing occurrence of moiré fringes to reduce degradation of image quality. A laser drive device generates laser beam by driving a laser beam source on an auxiliary pixel basis according to a lighting pattern that defines a pattern for turning on or off the laser beam on an auxiliary pixel basis. A CPU sets the scanning magnification of a photosensitive member in a main scanning direction. Further, the CPU sets the lighting pattern, based on the image data, according to the set scanning magnification, pixel by pixel basis such that the lighting pattern becomes aperiodic in a sequence of pixels. The CPU outputs the lighting pattern to the laser drive device.

Abstract: Laser printers are plagued with an assortment of alignment issues. In color laser printers the issues are exacerbated. Variations in distance from the mirror to the drum can lines in different color planes to vary in size. Variations in angles in the facets of the mirror can cause alignment issues between lines. Even lack of synchronization between the dot clock and start of line indication can cause misalignment between rows. In addition, a cosine distortion occurs due to the non-constant linear velocity of the laser scan of a single line. A very high speed master clock can drive the laser scanning unit. By using a very high speed clock, the control circuitry has the resolution to compensate for many of these distortion types, by appropriately counting clock cycles and indicating such to the laser modulator.

Abstract: A method, system, and computer program product for estimating a banding profile in an image printing system is disclosed. The method includes obtaining image data across multiple measurement intervals by one or more sensors; combining the image data with timing information into a coherent signal by a processor; estimating periodic and aperiodic components of the coherent signal using least squares estimation by the processor, wherein the periodic component represents a banding profile; and wherein at least the periodic component is used to generate an output.

Abstract: A method, system, and computer program product for estimating a banding profile in an image printing system is disclosed. The method includes obtaining image data across multiple measurement intervals by a sensor; combining the image data with timing information into a coherent signal by a processor; determining aperiodic components of the coherent signal by the processor; determining the periodic component of the coherent signal using spline interpolation, wherein the periodic component represents a banding profile, by the processor; and printing an output print with a correction applied based on the banding profile.

Abstract: An optical recording apparatus includes a traverse, a control circuit board, a shield substrate and an flexible flat cable (FFC). The traverse includes a spindle motor for rotating an optical disc and an optical pickup head for reading and/or writing the optical disc, the optical pickup head moves along a radial direction of the optical disc when reading and/or writing the optical disc. The FFC electrically connects the optical pickup head and the control circuit board and transmits signals between them, and a portion of the FFC adjacent to the second end is bent to facing the shield substrate. The shield substrate includes at least two limiting members, and the at least two limiting members are positioned at two opposite sides of the portion of the FFC facing the shield substrate to enable the portion of the FFC facing the shield substrate to move along the first direction.

Abstract: A print head, including: a plurality of chips disposed in a linear array; respective pluralities of first and second matrix drivers on each the chip connected to first and second channels, respectively; and for each chip, first groups of light-emitting diodes (LEDs). Each first group of LEDs includes: a second group of LEDs, with a first number of LEDs, connected to a respective first matrix driver; and a third group of LEDs, with the first number of LEDs, connected to a respective second matrix driver. LEDs in each first group of LEDs are disposed in a staggered arrangement; and the respective pluralities of first and second matrix drivers are for activating in sequence the LEDs in the second and third groups of LEDs, respectively.

Abstract: An apparatus for switching and controlling the intensity of a laser beam directed toward a beam detect sensor for an image forming device. A printing power reference signal and a beam detect power reference signal is selectively connected to a laser driver through a first switch. A printing power reference holding capacitor and a beam detect power reference holding capacitor is selectively connected to the laser driver through a second switch that is controlled in tandem with the first switch. During each scan cycle, the output laser power is monitored and used to adjust one of the two holding capacitors based such that both the printing power and the beam detect power have a controlled reference.

Abstract: A light-emitting device includes: light-emitting chips each including light-emitting elements and memory elements corresponding to each other, each memory element memorizing a light-emitting element to light up, each light-emitting chip being capable of lighting up the light-emitting elements in parallel; a unit to transmit an enable signal in common to light-emitting chips belonging to each of M groups obtained by dividing the light-emitting chips, the enable signal enabling selection of light-emitting elements to light up; a unit to transmit a write signal in common to light-emitting chips belonging to each of N classes obtained by dividing the light-emitting chips, the write signal setting memory elements corresponding to the light-emitting elements to light up, to a memory state or not, in the light-emitting chips where the selection is enabled; and a unit to transmit light-up signals for lighting up to light-emitting elements corresponding to memory elements in the memory state.

Abstract: A write control circuit for controlling driving of a plurality of light sources each including a laser diode for emitting light includes a plurality of write control mechanisms configured to control the plurality of laser diodes to perform writing for image forming with a plurality of colors. Each of the plurality of write control mechanism includes at least one image development part for developing and processing image data and at least one laser diode control part for controlling driving of the laser diodes.

Abstract: An optical writing device includes a light source that emits multiple laser beams; a separating unit that separates each of the multiple laser beams into a monitor beam and a scanning beam; a photoelectric converting element 218 that outputs a monitor voltage depending on a quantity of the monitor beam; a memory that stores an initial correction value for correcting a set common current; and a microcontroller that calculates a reference current, which is produced by correcting the common current updated on the basis of the monitor voltages with the initial correction values, obtains corrected currents by correcting the common current with the calculated correction values, controls each quantity of the laser beam on the basis of the corrected currents, and determines that the light source is degraded if a ratio of the corrected current to the reference current is larger than a predetermined threshold value.

Abstract: Laser printers are plagued with an assortment of alignment issues. In color laser printers the issues are exacerbated. Variations in distance from the mirror to the drum can lines in different color planes to vary in size. Variations in angles in the facets of the mirror can cause alignment issues between lines. Even lack of synchronization between the dot clock and start of line indication can cause misalignment between rows. In addition, a cosine distortion occurs due to the non-constant linear velocity of the laser scan of a single line. A very high speed master clock can drive the laser scanning unit. By using a very high speed clock, the control circuitry has the resolution to compensate for many of these distortion types, by appropriately counting clock cycles and indicating such to the laser modulator.

Abstract: An optical writing apparatus includes a light source device that includes a VCSEL having an alignment of at least two channels in a sub scanning direction configured to emit plural light beams in a block. A deflector deflects the plural light beams toward an image bearer that forms an image by changing a line speed of image formation. A control device decreases a number of light beams by turning off a prescribed same number of the channels symmetrically from the both ends of the alignment in accordance with the line speed.

Abstract: A light emitting device includes light emitting chips, a mount board on which the light emitting chips are mounted, and a buffer amplifier. Each of the light emitting chips includes light emitting elements and transfer elements. The transfer element sequentially specify, by sequentially entering an on-state, the light emitting elements as targets for control of illumination or non-illumination. Each of the transfer elements is provided for a corresponding one of the light emitting elements. The buffer amplifier is provided on the mount board, and outputs a transfer signal on the basis of an input transfer signal. The transfer signal is used to sequentially set the transfer elements, which are included in each of the light emitting chips, to be in the on-state.

Abstract: A drive circuit for supplying a drive current to a plurality of driven elements includes a plurality of drive output terminals to be connected to the driven elements. The drive output terminals are arranged with a specific pitch in between in an arrangement direction. The drive circuit further includes a plurality of drive transistors. Each of the drive transistors is arranged in an occupied area with a specific width in the arrangement direction larger than the specific pitch.

Abstract: An image forming apparatus includes an exposing unit and a first processing component. The first processing component is configured to generate a first data and a second data. The first data causes the exposing unit to blink in accordance with image data. The second data sets a blink mode of the exposing unit. The image forming apparatus also includes a second processing component connected to the first processing component through a first signal line. The second processing component is configured to receive the first data and the second data from the first processing component and perform blink control of the exposing unit based on the first data and the second data. The exposing unit is connected to the second processing component through a second signal line. The image forming apparatus thus can remedy a defect in data communication to the exposing units.

Abstract: A high-frequency clock generating circuit generates a plurality of high-frequency clock signals having different phases. A modulation-signal generating circuit generates a pulse modulation signal based on transition timing data including data pertaining to a turn-on timing at which a state of a light source is changed from a turn-off state to a turn-on state and a turn-off timing at which the state of the light source is changed from the turn-on state to the turn-off state by inputting any one of the high-frequency clock signals for a predetermined period including the turn-on timing and the turn-off timing.

Abstract: A light-emitting element array drive device includes: plural light-emitting elements; plural switch elements electrically connected mutually in an array and respectively to the light-emitting elements, and setting the respective light-emitting elements ready to emit light when turned on, and unready to emit light when turned off; a transfer signal supply unit supplying transfer signals for getting the switch elements turned-on by sequentially switching each switch element from being turned-off to turned-on, and to turned-off, where periods during which the respective switch elements are turned on are displaced so that each two periods for two of the switch elements adjacently-connected overlap; and a light-emission signal supply unit supplying a light-emission signal having light-emitting periods for the light-emitting elements, where an end point of each light-emitting period is set based on a start point of the above overlap, while a start point thereof is set before each end point.