Abstract: In an image forming apparatus, a lifetime detection unit acquires an activation time threshold using a threshold stored in an activation time storage unit and an environmental temperature detected by a temperature detection unit, and, in a case where activation time acquired by an activation time acquisition unit is shorter than the activation time threshold, makes a notification of at least one of a lifetime or replacement of a deflection unit or an optical scanning unit.

Abstract: A light-emitting diode exposure head includes a lens array, a long holder to hold the lens array, and a substrate having light-emitting diodes that emit light to expose a photosensitive member. The lens array includes lenses and condenses the light emitted from the light-emitting diodes on the photosensitive member. The long holder includes a base portion having an opening into which the lens array is inserted, and a pair of extended portions extended in a direction that is opposite of an emitting direction of the light along an optical axis of each of the lenses from both ends of the base portion in a transverse direction of the long holder. The pair of extended portions and the substrate are bonded in a state where leading edges of the pair of extended portions are in contact with a light-emitting surface of the substrate that serves as a surface of the substrate.

Abstract: According to one embodiment, the exposure device includes an exposure head, a holder, a biasing member, a lifting mechanism, a support member, a harness, and a protrusion. The holder supports the exposure head movably in a first direction of approaching the photosensitive drum and a second direction of being spaced from the photosensitive drum. The harness has one end portion connected to the exposure head. The harness is positioned with respect to the support member in a positioning location having a length direction position different from that of the one end portion. The harness has a folding portion formed between the one end portion and the positioning location. The protrusion enters inside of the folding portion to regulate movement of the folding portion of the harness in the first direction or the second direction. The protrusion protrudes from the holder in a third direction intersecting the first direction.

Abstract: An optical print head that performs optical writing to a photoreceptor includes: a light transmissive substrate; a light emitting unit including light emitting element groups, each of which includes two or more light emitting elements disposed on a first main surface of the substrate; a lens array including lenses that correspond one-to-one to the light emitting element groups; light detection units disposed above the second main surface of the substrate in one-to-one correspondence to the light emitting element groups and that detects the light from each of the light emitting elements; and correction unit that corrects light amounts of the light emitting elements of the light emitting element group based on detection of the light detection units.

Abstract: An image forming apparatus including a photoconductor and a light emitting unit further includes a generating unit configured to generate correction data used for correcting a shift in the sub-scanning direction of a latent image to be formed on the photoconductor; a correcting unit configured to correct image data based on the correction data; and a control unit configured to control light emission of the light emitting unit so as to form the latent image on the photoconductor. The generating unit is configured to generate the correction data based on configuration information of the light emitting unit, information indicating time required for causing a plurality of light emitting elements to emit light, and information indicating a rotation speed of the photoconductor.

Abstract: The disclosure relates to a display device, including a first substrate, a light emitting component, an insulating layer, and a conductive element. The first substrate has a driving component and a common line. The light emitting component is disposed on the first substrate and has a first electrode and a second electrode. The first electrode is electrically connected to the driving component. The insulating layer is disposed to the first substrate and has a first opening and a second opening. The first opening exposes the second electrode of the light emitting component. The second opening exposes the common line. The common line is electrically connected to the second electrode through the conductive element.

Abstract: An image forming apparatus includes an LED unit capable of being in an exposing position or a retracted position, and a cartridge capable of being inserted into or pulled out with the LED unit in the retracted position.

Abstract: A method and system for managing one or more high frequency service items associated with a device. A parent/child relationship between the high frequency service items can be defined to track replacement of components based on a service action related to a child component. A taxonomy of related service items and servicing functions can be specified in an XML document associated with the rendering system. The relationship between the high frequency service items can be indicated utilizing a related component indicator and a HFSI counter. A parent component can be replaced by a maintenance operator and an aggregate child component can be rebuilt by a service engineer in order to retain the component life thereby reducing down time and service costs.

Abstract: A photodetector includes an array of pixels, each pixel comprising a defined doped region defined in a doped semiconductor layer. The defined doped region is defined by selected regions of ion implants to provide resistive isolation between each defined doped region. A capacitor is formed by the defined doped region and a metal layer disposed above the doped semiconductor layer. A contact metal line is disposed above the doped semiconductor layer. The capacitor metal and contact metal lines are electrically coupled together and are in electrical communication with the output of the photodetector array.

Abstract: A light-emitting apparatus includes: first and second array-shaped light emitters arranged in substantially parallel with each other to have a overlapping portion where a part of an area where the first array-shaped light emitter is capable of forming an image and a part of an area where the second array-shaped light emitter is capable of forming an image are overlapped with each other; a division unit that divides, based on a pixel pattern of bit map data including multiple pixel data, the bit map data into a first partial bit map data and a second partial bit map data; and a controller that allocates the first and second partial bit map data to the first and second array-shaped light emitters, respectively, and controls the first and second array-shaped light emitters based on the first and second partial bit map data.

Abstract: An optical writing device adopting a low cost and simple structure can obtain temperatures of light emitting elements. The device comprises a plurality of light emitting elements arranged linearly in a main scanning direction. The amount of light emitting of the light emitting elements changes by self-generated heat. The light emitting elements are divided into a plurality of groups. Each of the groups includes a prescribed number of light emitting elements. The device comprises a control unit for calculating the amount of heat generation of the light emitting elements for each of groups from clock time t0 to clock time t0+?t. The control unit calculates the temperature for each of the groups at the clock time t0+?t, based on the amount of heat generation from the clock time t0 to the clock time t0+?t and the temperature at the clock time t0.

Abstract: An illuminating device capable of stably illuminating an irradiated object such as a document while suppressing light loss with a simply structure is provided. An LED array and a reflective plate are disposed sandwiching a slit (St) through which light reflected by a document MS passes and a light-guiding member is disposed on the side of the LED array. The light-guiding member includes a direct emission unit disposed between an illumination range y centered on a document reading position and the LED array and an indirect emission unit disposed between the reflective plate and the LED array, a light incidence face of the direct emission unit and a light incidence face of the indirect emission unit are disposed at mutually different position around the LED array, and the LED array is disposed on a side of an interior angle formed by the light incidence faces.

Abstract: In an image forming device, a light-guiding member includes an integrated ridge extending in the longitudinal direction of the light-guiding member. The light-guiding member further includes a protrusion on the ridge. The illuminating device includes an attachment recess that holds the light-guiding member and a holder member that has a fit portion to which a protrusion is fitted. The protrusion is disposed at a position decentered to one end portion of the light-guiding member in the longitudinal direction of the light-guiding member.

Abstract: An illuminating device capable of stably illuminating an irradiated object such as a document while suppressing light loss with a simply structure is provided. An LED array and a reflective plate are disposed sandwiching a slit (St) through which light reflected by a document MS passes and a light-guiding member is disposed on the side of the LED array. The light-guiding member includes a direct emission unit disposed between an illumination range y centered on a document reading position and the LED array and an indirect emission unit disposed between the reflective plate and the LED array, a light incidence face of the direct emission unit and a light incidence face of the indirect emission unit are disposed at mutually different position around the LED array, and the LED array is disposed on a side of an interior angle formed by the light incidence faces.

Abstract: Provided is an image detection device including a light-emitting unit that emits light toward an image holding member, a first light-receiving unit that is disposed at a position where specular reflected light of the light emitted toward the image holding member is received, a second light-receiving unit that is disposed at a position where diffuse reflected light of the light emitted toward the image holding member is received, a light-emission control unit that controls an intensity of the light emitted by the light-emitting unit, and a reference member that is disposed at a position through which light having an intensity that is less than an intensity detectable by the second light-receiving unit passes in a case of the first intensity and through which light having an intensity that is equal to or higher than the intensity detectable by the second light-receiving unit passes in a case of the second intensity.

Abstract: An imaging optical system includes a plurality of lens optical system rows each including a plurality of lens optical systems arranged in a first direction. The plurality of lens optical system rows is arranged in a second direction perpendicular to the first direction and to an optical axis direction. Each of the plurality of lens optical systems in each of the plurality of lens optical system rows is configured to form an erect equal-magnification image in a cross section perpendicular to the second direction and configured to form an inverted image in across section perpendicular to the first direction. Ina cross section perpendicular to the optical axis direction, optical axes of the respective plurality of lens optical systems in adjoining ones of the plurality of lens optical system rows are separate from one another in the first direction and are located on the a line.

Abstract: A photosensitive drum extends in an axial direction. An irradiating unit includes a first reacting portion and a second reacting portion spaced from each other in the axial direction. A moving member includes a first acting portion and a second acting portion spaced from each other in the axial direction. The first acting portion and the second acting portion of the moving member act on the first reacting portion and the second reacting portion respectively, in response to attachment of the developing unit to a main body, such that the irradiating unit moves from the retracted position to the proximate position with respect to the photosensitive drum, and cancel the actions on the first reacting portion and the second reacting portion respectively, in response to removal of the developing unit from the main body, such that the irradiating unit moves from the proximate position to the retracted position.

Abstract: In order to detect a passage timing of a light beam and to suppress cost, a light beam detection circuit (2) includes a detection signal generation section (34) configured to receive a light beam for scanning of a scanning target (101A) with one optical sensor (10), and generate a detection signal corresponding to an amount of received light; a reference signal output section (44) configured to output a reference signal that is in proportion to a light-amount control signal of a light-emission element (LD1) that emits the light beam; and a synchronizing signal generation section (35) configured to compare a detection signal generated by the detection signal generation section (34) with a reference signal output from the reference signal output section (44) to generate a synchronizing signal to determine a position to start scanning of the scanning target (101A) with the light beam.

Abstract: An illuminator, a scanner module and an image scanning apparatus are provided. The scanner module includes an illuminator that includes a light source, a light guide extending in a main scanning direction to change a direction of the light from the light source, a guide holder recessed with a light guide mounting portion in which the light guide is mounted, and at least one supporting protrusion protruding from an entrance of the light guide mounting portion into the light guide mounting portion to support the light guide received in the light guide mounting portion. As the light guide is supported by the supporting protrusion formed at the entrance of the light guide mounting portion, it is possible to reduce deformation of the light guide and/or to prevent the light guide from being falling out of the light guide mounting portion when subjected to, e.g., a shock.

Abstract: An illuminating device capable of stably illuminating an irradiated object such as a document while suppressing light loss with a simply structure is provided. An LED array (71) and a reflective plate (73) are disposed sandwiching a slit (St) through which light reflected by a document MS passes and a light-guiding member (72) is disposed on the side of the LED array (71). The light-guiding member (72) includes a direct emission unit (77) disposed between an illumination range y centered on a document reading position and the LED array (71) and an indirect emission unit (78) disposed between the reflective plate (73) and the LED array (71), a light incidence face of the direct emission unit (77) and a light incidence face of the indirect emission unit (78) are disposed at mutually different position around the LED array (71), and the LED array (71) is disposed on a side of an interior angle formed by the light incidence faces.

Abstract: A surface-emitting laser device configured to emit laser light in a direction perpendicular to a substrate includes a p-side electrode surrounding an emitting area on an emitting surface to emit the laser light; and a transparent dielectric film formed on an outside area outside a center part of the emitting area and within the emitting area to lower a reflectance to be less than that of the center part. The outside area within the emitting area has shape anisotropy in two mutually perpendicular directions.

Abstract: An illuminator, a scanner module and an image scanning apparatus are provided. The scanner module includes an illuminator that includes a light source, a light guide extending in a main scanning direction to change a direction of the light from the light source, a guide holder recessed with a light guide mounting portion in which the light guide is mounted, and at least one supporting protrusion protruding from an entrance of the light guide mounting portion into the light guide mounting portion to support the light guide received in the light guide mounting portion. As the light guide is supported by the supporting protrusion formed at the entrance of the light guide mounting portion, it is possible to reduce deformation of the light guide and/or to prevent the light guide from being falling out of the light guide mounting portion when subjected to, e.g., a shock.

Abstract: A light-emitting device includes: plural light-emitting chips each having plural light-emitting elements, and each being designated, as a control target for lighting up or not lighting up, by two to Q designation signals (Q is an integer of two or more); and a selection signal generating part that selectively transmits P selection signals (P is an integer of three or more where P>Q) as the designation signals to designate each of the plural light-emitting elements as the control target, the designation signals for each of the plural light-emitting chips including a combination of two to Q selection signals taken from the P selection signals.

Abstract: An image reading apparatus includes a light guide arranged between a light source and a document. The light guide has a light incident surface at a side of the light source, light from the light source, is incident, a first light emitting surface at a side of the document, a second light emitting surface different from the first light emitting surface, a first reflecting surface between the first and second light emitting surfaces, a second reflecting surface between the light incident surface and the second light emitting surface, and a third reflecting surface facing the second reflecting surface. The first reflecting surface reflects light toward the first light emitting surface. The second reflecting surface reflects light toward one of the second light emitting surface and the first and third reflecting surfaces. The third reflecting surface reflects light toward the second light emitting surface or the first reflecting surface.

Abstract: An image forming apparatus that forms an image includes: a photosensitive element; an optical scanning device that includes a light source, and scans a surface of the photosensitive element in a main scanning direction with light emitted from the light source to form a latent image; a developing unit that develops the latent image; a photosensitive element period detecting sensor that detects a rotation period of the photosensitive element; a density sensor that detects a density variation of an image developed by the developing unit, in a sub scanning direction; and a processing device that corrects a driving signal of the light source according to the image information, based on an output signal of the density sensor and an output signal of the photosensitive element period detecting sensor.

Abstract: A mechanism for scanning and capturing digital images using document layer detection. Upon detecting a document placed on a scanning surface of a scanning device, the illustrative embodiments identify one or more layers within the document. The illustrative embodiments then scan the one or more layers within the document on a layer by layer basis.

Abstract: An optical scanner includes a light source, an optical element, a deflector, a casing, and a first cover. The deflector deflects the light beam emitted from the light source to scan a photoreceptor through the optical element. The casing includes an upper opening, walls including a transparent plate defining a deflector compartment to accommodate the deflector, and an optical element mounting portion to accommodate the light source and the optical element. The first cover covers the upper opening of the casing and includes a recessed portion recessed toward the bottom of the casing and including a first opening at the bottom thereof facing the deflector. The recessed portion and the walls are directly or indirectly connected to define a single continuous space isolating the deflector compartment from the optical element mounting portion. The recessed portion and the deflector compartment communicate via the first opening.

Abstract: A light source driving device for driving plural light sources is provided. The light source driving device includes a voltage booster to boost a voltage from a power source to supply the boosted voltage to each of the plural light sources; a constant current driver to regularly hold driving current of each of the plural light sources constant; a load to consume substantially the same power as the plural light sources; and a switch to selectively connect either the load or the plural light sources with the voltage booster and the constant current driver so that the load or the plural light sources are interposed between the voltage booster and the constant current driver.

Abstract: A semiconductor apparatus includes a substrate having at least one terminal, a thin semiconductor film including at least one semiconductor device, the thin semiconductor film being disposed and bonded on the substrate; and an individual interconnecting line formed as a thin conductive film extending from the semiconductor device in the thin semiconductor film to the terminal in the substrate, electrically connecting the semiconductor device to the terminal. Compared with conventional semiconductor apparatus, the invented apparatus is smaller and has a reduced material cost.

Abstract: An organic compound is represented by general formula (1): where R1 to R18 are each independently selected from a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group.

Abstract: An illuminating device includes a light-emitting element that is mounted on a base material and a light-guiding member that guides light from the light-emitting element to an irradiation target, and illuminates the irradiation target with the light transmitted through the light-guiding member. The light-guiding member includes an extending portion that extends from the surface of the base material on which the light-emitting element is mounted to a left side end portion of the base material so as to cover the left side end portion. An image-reading includes this illuminating device. Image-forming apparatus includes this image-reading apparatus.

Abstract: An image sensor using three-color, e.g., R, G, and B light-emitting elements assures a period in which all the three colors are turned on and periods in each of which one light-emitting element is turned off during a scan period per pixel, and integrates and measures amounts of light of the respective periods. An amount of light based on the OFF light-emitting element is calculated based on a difference between the amounts of light during the full light-ON period and each light-OFF period to define an amount of light of the light-emitting element, and light intensity information corresponding to each light-emitting element is obtained based on a total amount of light during the entire scan period per pixel, and the amount of light of each light-emitting element.

Abstract: A light emitting element array that can perform a time-division driving operation with a small number of driving ICs is provided. A light emitting element array chip (1) includes n switch thyristors (S) (wherein n is an integer equal to or greater than 2), n signal transmission lines (GH) connected to N-gate electrodes (d) of the switch thyristors (S) individually, a plurality of light emitting thyristors (T) having N-gate electrodes (b) connected to one of the n signal transmission lines (GH). Anodes (e) of selection thyristors (U) are connected to the N-gate electrodes (d) of the n switch thyristors (S), and N-gate electrodes (f) of the selection thyristors (U) are connected to a common selection signal transmission line (CSL).

Abstract: Disclosed are an illuminator and an image forming apparatus employing an illuminator. The illuminator includes a light guide to guide light generated from a light source to an object to be illuminated. The light guide includes at least one incidence face facing the light source and an emission face configured to emit the light to the target object. A diffusion pattern may be formed on the emission face to extend from one longitudinal end to the other longitudinal end of the emission face. The emission face may have a constant cross section or a varying cross section along a longitudinal direction thereof. The illuminator may be part of an image reading device to uniformly or near uniformly irradiate light to a document. The illuminator may also be incorporated in an image forming apparatus to irradiate light to a photosensitive body for elimination or reduction of electric potential from the photosensitive body.

Abstract: A semiconductor device is manufactured using dicing of a semiconductor wafer. The semiconductor device includes a substrate, a base insulating layer formed on the substrate, a semiconductor element formed on the base insulating layer, and a separate pattern portion formed on an end portion of the substrate separately from the base insulating layer. The separate pattern portion prevents the base insulating layer from being peeled off from the substrate when the dicing is performed.

Abstract: In regard to a secured original method, an image reading apparatus provided in an image forming apparatus reads a first original guide using an original reading portion and, based on a reading result thereof, changes a reading position of an adjustment sheet in a main scanning direction to enable detection of a difference between a brightness of the first original guide and a brightness of the adjustment sheet. In regard to a moving original method, the image reading apparatus reads a reading member using the original reading portion and, based on a reading result thereof, changes a reading position of an adjustment sheet in a main scanning direction to enable detection of a difference between a brightness of the reading member and a brightness of the adjustment sheet.

Abstract: An organic compound contains indacenodiperylene as the basic skeleton.

Abstract: An exposure head includes: at least one light emitting element; an imaging optical system adapted to image light from the light emitting element; at least one reference element disposed to the light emitting element; and a control section adapted to control light emission of the light emitting element, and to put off the reference element in a latent image forming operation, wherein the control section obtains degree of deterioration of the light emitting element based on an intensity of light emitted by the light emitting element at timing other than timing when the latent image formation operation is executed and an intensity of light emitted by the reference element at the timing other than the timing when the latent image formation operation is executed, and controls light intensity of the light emitting element in the latent image forming operation based on the degree of deterioration.

Abstract: An organic light-emitting element includes a first electrode, an organic compound layer, and a second electrode on a substrate and emits light from the second electrode side, wherein the second electrode includes a first layer and a second layer in contact with the first layer sequentially from the substrate side, the second layer is a layer comprising Ag, and the first layer is a layer comprising Ag and Cs.

Abstract: A surface-emission laser diode includes a GaAs substrate, a cavity region, and upper and lower reflectors provided at a top part and a bottom part of the cavity region, the upper reflector and/or the lower reflector including a semiconductor Bragg reflector, at least a part of the semiconductor distributed Bragg reflector includes a semiconductor layer containing Al, Ga and As as major components, there being provided, between the active layer and the semiconductor layer that contains Al, Ga and As as major components, a semiconductor layer containing Al, In and P as major components adjacent to the semiconductor layer that contains Al, Ga and As as major components, with an interface formed coincident to a location of a node of electric strength distribution.

Abstract: An image reading apparatus includes a light emitting unit which emits light to a document, a photoelectric conversion unit which converts a quantity of light reflected from the document into an analog signal, an A/D converter which converts the analog signal to a digital signal, a clock unit which clocks elapsed time from start-up of the light emitting unit, a light-quantity calculating unit which calculates the quantity of light emitted to the document from the light emitting unit on the basis of the clocked elapsed time, a correction value calculating unit which calculates a correction value of the digital signal on the basis of the quantity of light calculated by the light-quantity calculating unit and the digital signal, and a ? correction unit which corrects the digital signal by referring to the correction value calculated by the correction value calculating unit.

Abstract: An objective is to provide an organic photoreceptor exhibiting high sensitivity, suitable for exposure to a semiconductor laser having an emission wavelength of 350-500 nm or a light emitting diode, with which generation of memory images as well as image defects caused by very small charge leakage is inhibited, and also to provide an image forming apparatus fitted with the organic photoreceptor. Also disclosed is an organic photoreceptor possessing a charge generation layer and a charge transport layer provided on a conductive support, wherein the charge generation layer contains particles made of a condensed polycyclic pigment, having an average major axis length of 500 nm or less, an average aspect ratio of 2.5-5.0, and an aspect ratio variation coefficient of 16% or less.

Abstract: A drive device for outputting a drive signal for driving a plurality of light emitting elements time-divisionally, the drive device includes a plurality of input terminals receiving input of a drive control signal for the light emitting elements, and a plurality of output terminals connected to the light emitting elements, for outputting the drive signal based on the drive control signal input into the input terminals, in which the input terminals and the output terminals are arranged substantially in a line.

Abstract: A multifunction peripheral device capable of being operated in a plurality of switchable operational modes is provided. The multifunction peripheral device includes a reader unit with a light source and a light receiving element to receive the light reflected on the original document to generate image data, operation receiving members, through which a user's instructions are entered, a valid instruction storage unit to store valid instruction information, which defines correspondence between a valid instruction and a valid instruction receiving member, a judging unit to judge as to whether an operation entered through one of the operation receiving members is the valid instruction based on the valid instruction information and a current operational mode, and a switching unit to switch the light source on when the judging unit judges that the entered operation is the valid instruction.

Abstract: Generally, according to an embodiment, a light-emitting panel includes a substrate and a light-emitting unit. The substrate is extended in a first direction. The light-emitting units are a plurality of light-emitting units that is in line in the first direction and comprises a light-emitting surface of which a length of a second direction that is orthogonal to the first direction is shorter than a length of the first direction.

Abstract: In an optical beam scanning apparatus and an image forming apparatus equipped with the optical beam scanning apparatus of the present invention, plural optical members that irradiate scanning lines by laser beams (beams) emitted from plural light sources individually onto corresponding photoconductive drums are disposed within an optical unit housing and a housing cover, a fixing mechanism configured to fix part of a parallel plate provided within the optical unit housing and the housing cover is provided, and a twist angle adjusting mechanism configured to adjust an angle of twist of the parallel plate by rotating, in a specific direction, the parallel plate having the part thereof being fixed with the fixing mechanism is provided. According to the optical beam scanning apparatus and the image forming apparatus equipped with the optical beam scanning apparatus of the present invention, it is possible to adjust the curve and the inclination of the scanning line with ease and at high accuracy.

Abstract: Provided is a method for transferring, onto a second substrate, at least one of functional regions arranged and joined to a first separation layer that is disposed on a first substrate and that becomes separable by a treatment, in which regions on the second substrate where the functional regions are to be transferred have a second separation layer that becomes separable by a treatment. The method includes a step of joining the first substrate to the second substrate by bonding such that the functional regions contact the second separation layer; a step of separating the functional regions from the first substrate at the first separation layer; and a step of, before or after the step of separation, forming separation grooves penetrating through the second substrate and the second separation layer from a surface of the second substrate, the surface being opposite to a surface having the second separation layer thereon.

Abstract: This invention provides a surface-emitting laser that can prevent delamination at the interface of a selective oxidation layer and a spacer layer, while suppressing any rise of voltage, to improve the reliability of operation.

Abstract: A light-emitting device includes: plural light-emitting array units that each include plural light-emitting elements, and for which lighting up and not lighting up are controlled by using a combination of a selection signal for selecting a control target for lighting up or not lighting up and a light-up signal for supplying power for lighting up to each light-emitting element forming the plural light-emitting elements; a selection signal generating unit that sends plural selection signals including the selection signal to the plural light-emitting array units; and a light-up signal generating unit that sends plural light-up signals including the light-up signal to the plural light-emitting array units.

Abstract: An image forming apparatus is provided. The image forming apparatus includes: plural photosensitive members; plural exposing units opposed to the photosensitive members, respectively, each of the exposing units including a plurality of light emitting elements arranged in a first direction; and a body frame which is provided at both sides of the exposing units in the first direction. Each of the exposing units includes: a gap maintaining member which abuts a respective one of the photosensitive members to define a distance between the exposing unit and the photosensitive member; a first-direction positioning portion which abuts the body frame in the first direction to position the exposing unit in the first direction; and a second-direction positioning portion which abuts the body frame in a second direction perpendicular to the first direction and an exposing direction of the light emitting elements, to position the exposing unit in the second direction.