Abstract: A method determines an identification value of a rotatable element having a plurality of mirror facets. The identification value is determined based on a facet scan duration obtained of the mirror facets or based on a prismatic error of the mirror facets.

Abstract: Disclosed is an image forming apparatus, including: n laser elements arranged in the sub-scanning direction and configured to simultaneously scan an image; a pixel selection unit configured to execute a thinning process in which the pixels are thinned by selecting m pixels among n pixels arranged in the sub-scanning direction, and to output selected pixel information for specifying the selected pixels; a pulse width modulation processing unit configured to sequentially convert image data corresponding to the m pixels into m pulse width modulation signals; a transmission unit configured to transmit the m pulse width modulation signals in parallel; an assignment unit configured to assign the m pulse width modulation signals to m laser elements in accordance with the selected pixel information; and a driving unit configured to drive the laser elements in accordance with the assigned pulse width modulation signals.

Abstract: A processor receives a print job, identifies possible extension marking materials to use to print the print job, and optimizes the order in which the extension marking materials will be used in multiple printing passes. A user interface outputs instructions to insert, into a receptacle, a first interchangeable supply container containing a first extension marking material that is in addition to base marking materials. A printing engine prints first markings (using the first extension marking material) that comprise a first portion of the print job. The user interface outputs instructions to return the partially printed print media to a sheet supply and to insert a second interchangeable supply container containing a second extension marking material. The printing engine prints second markings (using the second extension marking material) that comprise a second portion of the print job, on the partially printed print media, to produce the finally printed print media.

Abstract: In one example, an encoding station of a printing system forms a pattern of non-printed features onto flowing print media. The non-printed features are detected, and timing signals generated from the detected features. The timing signals cause the media to be printed at a desired resolution in the direction of the flow.

Abstract: Provided is an image forming apparatus including a casing body, an exposure portion in a rod shape that has a connector and exposes a target object, a first support portion that supports the exposure portion over a longitudinal direction of the exposure portion and is removed from the casing body by being moved in the longitudinal direction, and a cable that is connected to the exposure portion via the connector, transmits power to the exposure portion, has a curved area that is a part of the cable in a curved state, and is in contact with the first support portion in a part of the curved area, in a state where the first support portion is accommodated in the casing body.

Abstract: A light scanning unit includes a light source unit emitting a light beam according to an image signal, a light deflector scanning the light beam that is deflectively emitted by the light source unit, a housing having a side portion where the light source unit is provided and a base surface on which the light deflector is provided, and a deformation prevention member connecting opposite sides of the housing across an upper side of the base surface. The light scanning unit is employed by an image forming apparatus.

Abstract: An image forming apparatus includes: a pseudo-halftone processing unit that processes input image data to output image data of first resolution; a resolution converting unit that converts the image data of the first resolution into image data of second resolution that is higher than the first resolution; a modulation-signal generating unit that generates a modulation signal obtained by modulating the image data of the second resolution according to a clock signal; and a light-source driving unit that drives a light source according to the modulation signal. The pseudo-halftone processing unit converts a region of pixels having the same pixel value into a parallel line pattern that is formed with a plurality of parallel lines oblique relative to a direction of arrangement of pixels. The resolution converting unit generates the image data o in which each edge of the lines forming the parallel line pattern is smoothed.

Abstract: There is provided an optical scanning device and an image forming apparatus including the optical scanning device. The optical scanning device includes an optical box containing light source units, a rotating polygon mirror, and a motor. In order to prevent the entire optical box from being deformed by deformation occurring in the installation region due to heat of the driving unit, the optical box includes a connection region between a second sidewall and an installation region where a driving unit is installed. The optical box further includes regions provided next to the connection region and having heights different from each other. A concave portion is formed in the connection region.

Abstract: When an operation member is moved in a state in which a cartridge is mounted to an apparatus main body of an image forming apparatus, a cartridge supporting member is rotated away from a transfer member so that the cartridge is rotated and enters a state in which the cartridge is inclined at an angle ?1 with respect to the transfer member, and an exposure device is rotated away from the transfer member and enters a state in which the exposure device is inclined at an angle ?2 higher than the angle ?1 with respect to the transfer member.

Abstract: The invention relates to a marking apparatus (100) for marking an object with laser light, comprising a plurality of lasers (10) and a control unit for individually activating each of the lasers to emit a laser beam according to a sign to be marked. A set of deflection means (30) for rearranging the laser beams into a two-dimensional array of laser beams is provided, the set of deflection means (30) comprises at least one deflection means (33) per laser beam, in particular at least one mapping mirror (33) or one optical waveguide per laser beam.

Abstract: An image forming apparatus includes a vibration adjustment unit which adjusts a natural frequency of an optical system, a measuring unit which measures vibrational information indicating change in vibration, and a controller which individually drives each unit. The measuring unit measures the vibrational information after the natural frequency is adjusted to a drive frequency of each unit at an initial state. The controller stores this vibrational information as initial vibrational information. The measuring unit measures the vibrational information after the natural frequency is adjusted to a drive frequency of a unit to be checked. The controller compares this vibrational information with the initial vibrational information measured after adjustment of the natural frequency to the drive frequency of the unit to be checked. The controller determines abnormality in the unit to be checked according to the comparison.

Abstract: A multibeam light source unit, a method of adjusting the same, a light scanning unit, and an image forming apparatus are provided. The multibeam light source unit includes light sources that emit multiple beams, a flange that includes installation surface on which holder installation holes are provided, and middle holders on which a light source is installed. The middle holder includes a light source mounting unit, a cylinder-shape insertion unit that is inserted into a holder installation hole, and fixing protrusion units protruding outside from a light source mounting unit and fixed to the flange, and a jig coupling unit that is coupled with a jig when adjustment is performed.

Abstract: According to aspects of the embodiments, there is provided methods of dynamically focusing an LED print bar or printhead using piezoelectric stacks. The stack is mounted on either end of the LED bar to adjust the focus of the bar against the photoreceptor surface. The piezo level could be either controlled through active feedback of some description such as optical or electrical, or as a service or manufacturing input. With electronic control, focus adjustments can be made by the machine, and dynamically, if needed. In one embodiment, a flextensional cell structure is employed to amplify the movement of the piezo stack to move the LED bar in the order of >50 microns closer or away from the photoreceptor surface.

Abstract: An image forming apparatus which is configured to expose a photosensitive member to light beams emitted from a plurality of light emitting elements, generates a plurality of BD signals by a plurality of laser light beams, and controls timings at which the plurality of light emitting elements emits the light beams based on a difference between timings at which the BD signals are generated.

Abstract: An image forming apparatus, including: a photosensitive member; a light source configured to emit a light beam; a deflecting unit configured to deflect the light beam to scan the photosensitive member to form an electrostatic latent image and having a rotary polygon mirror and a motor configured to rotate the rotary polygon mirror; a housing provided with the photosensitive member, the light source, and the deflecting unit; a temperature detecting unit configured to detect a temperature; and a control unit configured to pre-rotate the rotary polygon mirror before a start signal for image formation and to rotate, after the start signal, the rotary polygon mirror at a rotation speed higher than a rotation speed for pre-rotation of the rotary polygon mirror, wherein the control unit sets a target value of the rotation speed for the pre-rotation based on a result of detection by the temperature detecting unit.

Abstract: A scan-line adjusting device includes a first biasing unit which applies a first biasing force in biasing direction to a longitudinal one end of an optical unit, a second biasing unit which applies a second biasing force in the biasing direction to a longitudinal other end of the optical unit, a support unit which supports the optical unit at a position between a position where the first biasing force is applied and a position where the second biasing force is applied while allowing the optical unit to pivot against the biasing force, a position limiter which limits a position of the longitudinal one end against the first biasing force and can change the position in the biasing direction, and a vibration damping member which damps vibration transmitted from the second biasing unit to the optical unit.

Abstract: An image forming apparatus includes a signal generation unit configured to generate a light-emission signal. The signal generation unit stores information relating to a toner non-adherent area oriented light-emission pattern having been set beforehand. The toner non-adherent area oriented light-emission pattern is a light-emission pattern that causes a light irradiation unit to emit light in such a way as to prevent toner particles from adhering to a photosensitive member. When the light irradiation unit scans respective portions corresponding to two pixels adjacently disposed in a scanning direction a based on a part of the light-emission signal generated based on the toner non-adherent area oriented light-emission pattern, at least one of (a) light-emission start timing of light irradiation unit and (b) light-emission termination timing of the light irradiation unit is differentiated between the two pixels.

Abstract: An angle formed between a first beam light ray D1 and a second beam light ray D2 is ?12, an angle formed between the second beam light ray D2 and a third beam light ray D3 is ?23, and an angle formed between the third beam light ray D3 and a fourth beam light ray D4 is ?34, where the first, second, third, and fourth beam light rays D1, D2, D3, and D4 have been reflected by a reflective surface of a rotating polygon mirror, ?23 is the smallest, of the three angles, that is, ?12, ?23, and ?34.

Abstract: A light emission apparatus includes a detection unit, a first drive unit, and a second drive unit. The detection unit detects the state of a detection element. The first drive unit controls the light amount of a light beam to be emitted by a first light emitting element based on the state of the detection element detected by the detection unit. The second drive unit controls the light amount of a light beam to be emitted by a second light emitting element based on the state of the detection element detected by the detection unit.

Abstract: An image forming apparatus includes a latent image forming unit, a developing unit, a transfer unit, a detector, an adjustment unit, and a controller. The latent image forming unit concentrates a beam emitted from a light source onto a surface of a photoconductor and forms a latent image on the surface of the photoconductor. The developing unit develops the latent image on the surface of the photoconductor to form a toner image. The transfer unit transfers the toner image on the surface of the photoconductor onto a transferred-image receiving member. The detector detects a potential of the latent image or a density of the toner image. The adjustment unit adjusts a focusing state of the concentrated beam on the photoconductor. The controller controls the adjustment unit in accordance with a result of detecting the potential of the latent image or the density of the toner image.

Abstract: A light scanning device includes a scanning unit and a power consumption unit. The scanning unit faces a scan surface and performs scanning by dividing one scan area into segments by having multiple light-emitting-element groups arranged in a predetermined scanning direction. Each light-emitting-element group writes an image onto the scan surface by causing multiple light-emitting elements arranged in the scanning direction to emit light in a time-division manner based on image information. The power consumption unit operates during a non-writing period occurring between scanning processes repeatedly executed in each light-emitting-element group, so as to cause consumption of electric power corresponding to electric power consumed for light emission in the light-emitting-element group.

Abstract: An image forming apparatus outputs a clock signal used for outputting image data, outputs first image data in accordance with the outputted clock signal, outputs second image data in accordance with a clock signal for which the output clock signal is caused to change by a spread spectrum clock oscillator circuit, calculates a logical OR of the two outputs, and outputs image data, which is the calculation result, to an image forming unit. A laser device provided in the image forming unit is controlled in accordance with the outputted image data.

Abstract: Cathodes of a first group of plural transfer thyristors are connected with a first transfer signal line, and also connected with a first reception terminal through a first current limiting resistance. A first transfer signal is transmitted to the first reception terminal. Cathodes of a second group of the plural transfer thyristors are connected with a second transfer signal line, and also connected with a second reception terminal through a second current limiting resistance. A second transfer signal is transmitted to the second reception terminal. The plural transfer thyristors each have an anode, a cathde, a first gate, and a second gate. A three-terminal switch element and a resistance are connected between a second gate of a former transfer thyristor and a first gate of a later transfer thyristor, the former and later transfer thyristors being closely arranged upstream and downstream transfer thyristors among the plural transfer thyristors.

Abstract: A light scanning device includes a plurality of light-emitting elements for scanning a scan object with respective light beams emitted from the respective light-emitting elements. The light scanning device includes secured sections, a first substrate, and a second substrate. To the secured sections, the respective light-emitting elements are secured. The first substrate includes a first connector. Mounting positions of the respective light-emitting elements to the first substrate are displaceable. The respective light-emitting elements are coupled to the first substrate. The second substrate includes a second connector coupled to the first connector. The first substrate and the second substrate are secured to a first specified position and a second specified position, respectively.

Abstract: An optical scanning device including a light source and a rotating polygon mirror having a plurality of reflective surfaces scans a scan area of a surface in a main scanning direction with the light flux emitted from the light source and reflected by the rotating polygon mirror. All the light flux is reflected by a first reflective surface when light flux deflected by the rotating polygon mirror is directed onto a center position of the scan area, and a part of the light flux incident to the rotating polygon mirror is reflected by a second reflective surface adjacent to the first reflective surface when light flux reflected by the rotating polygon mirror is directed onto at least one end of both ends of the scan area and the light flux obliquely enters a plane perpendicular to a rotation axis of the rotating polygon mirror.

Abstract: The image forming apparatus includes a photosensitive drum and a light emitting device. In the rotational axis direction of the photosensitive drum, the width of the weak light exposure region on the photosensitive drum in which an exposing device emits weak light is larger than the width of a region corresponding to the width of a recording medium on which an image is formed, but smaller than the width of a region on the photosensitive drum charged by a charging roller.

Abstract: A light scanning device include a housing and an f? lens. The housing includes a bottom plate and a sidewall disposed upright at the bottom plate. The rotating polyhedron and the f? lens are each installed at the bottom plate of the housing. The rotating polyhedron is configured to deflect and scan light beam. Light beam deflected and scanned by the rotating polyhedron transmits the f? lens. The bottom plate of the housing includes a stepped portion at a part corresponding to a peripheral area of the f? lens. The stepped portion is formed lower than a top surface of the bottom plate. The stepped portion has a ridge line in a concavo-convex shape.

Abstract: An optical scanning device includes first and second light sources, a polygon mirror, first and second scanning lenses, first and second reflecting mirrors, and an adjusting mechanism for adjusting the posture of the first reflecting mirror. The adjusting mechanism adjusts the posture of the first reflecting mirror using a predetermined first adjustment amount so that a first scanning line drawn by a first light beam to scan a first circumferential surface and a second scanning line drawn by a second light beam to scan a second circumferential surface are parallel when a drum rotation speed is a predetermined first speed, and adjusts the posture of the first reflecting mirror using a predetermined second adjustment amount different from the first adjustment amount and capable of making the first and second scanning lines parallel at a second speed different from the first speed when the drum rotation speed is the second speed.

Abstract: An image forming apparatus which makes it possible to grasp such settings of a phase and a main scanning magnification of laser beams as reduce occurrence of moire, by visually checking a plurality of pattern images. Pattern images are formed using a laser beam irradiated from a reference light source and a laser beam irradiated from an adjustment target light source for which each of different phase values is set as a phase setting value. A phase relationship between the phases of the laser beams is adjusted based on the pattern images. Pattern images are formed using a laser beam irradiated from the adjustment target light source for which each of different magnification values is set as a magnification setting value. The magnification of the laser beams is adjusted based on these pattern images.

Abstract: An optical scanning apparatus and an image forming apparatus including the optical scanning apparatus, the optical scanning apparatus includes a dust-proof shutter having an opening portion. The opening portion has a side-surface opening portion and a top-surface opening portion. The side-surface opening portion is formed in a side surface of the dust-proof shutter. A cleaning member used for cleaning a dust-proof glass is inserted through the side-surface opening portion. The top-surface opening portion guides a moving direction of the cleaning member inserted through the side-surface opening portion, to a direction along a longitudinal direction of the dust-proof glass. When the dust-proof shutter is located at a first position, a light beam passed through the dust-proof glass passes through the top-surface opening portion.

Abstract: An image forming apparatus that forms a color image by layering toner images of different colors includes: a photoreceptor on which an electrostatic latent image is formed through charging and exposure; an exposure unit performing exposure-scanning on the photoreceptor in accordance with image signal; an intensity determination unit determining exposure intensity according to image forming condition; and a timing determination unit determining a timing of inputting image signal for each scanning line, wherein the exposure unit has a delay duration differing depending on the exposure intensity and being from input of image signal of each pixel to be exposed to exposure of the pixel at the exposure intensity, and the timing determination unit obtains the delay duration corresponding to the exposure intensity, and determines the timing such that image signal of an initial pixel to be initially exposed is input the delay duration before the initial pixel is exposed.

Abstract: A light irradiating device causes a light source to emit light with normal emitted light quantity sufficient for adhering toner on a photosensitive member, on an image portion of the photosensitive member, and causes the light source to emit light with minute emitted light quantity sufficient for preventing toner from being adhered on the photosensitive member, which is smaller than normal emitted light quantity. The light irradiating device includes a determining unit to determine a reference value input to the light irradiating device. Minute emitted light quantity is set based on the reference value input to the light irradiating device. The determining unit determines the reference value to be input to the light irradiating device based on information of relationship between a predetermined reference value and the light quantity in the position of the photosensitive member when causing the light source to emit light, based on the predetermined reference value.

Abstract: A light source unit includes a surface-emitting laser array including light emitting units; and an apertured member provided on a light path of light beams emitted from the surface-emitting laser array, the apertured member including an aperture. In at least one direction, an intensity distribution of interference patterns caused by the light beams passing through the aperture includes an equal number of crests and troughs.

Abstract: An image forming apparatus, including: a laser light source supplied with a bias current and a superimposed current to emit laser light; a splitting unit configured to split the laser light into first and second laser lights; a photoelectric conversion unit configured to output a voltage corresponding to a light intensity of the second laser light; a voltage holding unit configured to hold a voltage output from the photoelectric conversion unit with not the superimposed current but the bias current being supplied to the laser light source; a voltage conversion unit configured to remove the voltage held by the voltage holding unit from the voltage from the photoelectric conversion unit which receives the second laser light; and a current control unit configured to control, based on a voltage from the voltage conversion unit, a value of the superimposed current supplied to the laser light source based on image data.

Abstract: A scanning optical device includes a deflector deflecting a light beam emitted from a light source, and a pair of optical component groups arranged on both sides of the deflector in a sub-scanning direction and focusing the light beams deflected by the deflector to form images on a surface of an image carrier. Each of the optical component groups has a lens focusing the light beam deflected by the deflector in the sub-scanning direction, and a mirror reflecting the light beam passed through the lens toward the surface of the image carrier. One lens of one optical component group and the other lens of the other optical component group are supported so as to deform in the opposite directions each other in the sub-scanning direction when they are thermally deformed.

Abstract: A method for generating a BD signal and identifying a reflection surface after a polygonal mirror has reached approximately constant rotation speed increases time to start image formation because the step of generating the BD signal is needed. An image forming apparatus identifies a reflection surface on which a light beam is incident by using the period of an FG signal.

Abstract: A light beam emitting apparatus including: a light source having plural light emitting points emitting beams; and a holding member configured to hold the source and having first, second, and third abutment portions, an emission direction of the beams being regulated by the abutment portions in abutment with the source, wherein as viewed along an optical path of the beams, an angle formed by a first line connecting two farthest light emitting points with a second line connecting the first and second abutment portions is smaller than angles formed by the first line with a third line connecting the second and third abutment portions and formed by the first line with a fourth line connecting the third and first abutment portions, and a distance between the first and second abutment portions is larger than distances between the second and third abutment portions and between the third and first abutment portions.

Abstract: An optical writing device forming an electrical latent image on a photoreceptor includes an optical writing unit configured to apply light to the photoreceptor, a power supply unit configured to supply power to the optical writing unit, a power supply status detector configured to detect a power supply status of the power supplied from the power supply unit to the optical writing unit, and output power supply information or power cutoff information, a power cutoff information retaining unit configured to retain the power cutoff information when the power cutoff information is output from the power supply status detector, and a power sensor configured to sense a power supply status of the power supplied by the power supply unit based on the power cutoff information retained by the power cutoff information retaining unit.

Abstract: An optical writing controller that controls a light source to expose a photoconductor and forms an electrostatic latent image on the photoconductor calculates a correction value for correcting a superimposing position where the developed images for different colors developing each of the electrostatic latent images formed on each of the multiple photoconductors are superimposed based on the detection signal output by a pattern detection sensor that detects a pattern for correcting the superimposing position, controls the multiple light sources to draw a predetermined pattern repeatedly in the sub-scanning direction so that stepwise patterns whose width in the main scanning direction varies with repetition are formed, and determines the width in the main scanning direction of the patterns for correcting based on the strength of the detection signal output by the pattern detection sensor.

Abstract: An image forming method includes: exposing a surface of an image carrier with a light based on an image pattern including an image portion and a non-image portion to form an electrostatic latent image corresponding to the image pattern. The image portion is made up of a plurality of pixels. Some of the pixels that make up the image portion are exposed with light of a first output value that is higher than a prescribed optical output value when the entire pixels corresponding to the image portion are exposed over a prescribed time period.

Abstract: An image forming apparatus includes multiple light emitting elements (LDs) as a light source, controls the light source such that laser beams emitted from LD1 and LDN are sequentially incident on a BD sensor in a non-image-forming period, and measures a time interval between two BD signals output sequentially from the BD sensor. When image formation is performed subsequent to the non-image-forming period, the image forming apparatus controls the light source such that a laser beam from the LD1 is incident on the BD sensor. Furthermore, using a single BD signal output from the BD sensor as a reference, the image forming apparatus controls timings at which the LDs emit laser beams based on the image data, according to the measurement value of the time intervals between the BD signals.

Abstract: An image forming apparatus using the laser scan method or the LED method, which is capable of reducing a variation of spot diameter with a simple mechanism, and of forming a high-quality image by adjusting the density depending on the image resolution with a low cost. The image forming apparatus forms an image by developing an electrostatic latent image formed by irradiating a charged photoconductor with light emitted from a light source with developer. A detecting unit detects a distance between an attention pixel and an adjacent image that is adjacent to an image including the attention pixel across a white background. An adjustment unit adjusts a density of the attention pixel based on the distance measured with the detecting unit and a spot diameter of the light on a surface of the photoconductor.

Abstract: Provided is an optical scanning apparatus which can achieve high resolution while reducing detection errors in the synchronous detection of a plurality of light fluxes by temperature fluctuations. An optical scanning apparatus according to this invention includes a light source having a plurality of light-emitting points, a deflection unit configured to deflect a plurality of light fluxes emitted by the plurality of light-emitting points, a scanning optical system configured to guide the plurality of light fluxes deflected by the deflection unit onto a scanned surface, and a synchronous detection unit configured to detect light fluxes from at least two light-emitting points of the plurality of light-emitting points. The synchronous detection unit includes a plurality of imaging elements. The first imaging element, of the plurality of imaging elements, which exhibits the smallest change in refractive index with respect to temperatures has the largest refractive power in a main scanning section.

Abstract: A light scanning apparatus includes a light source, a deflector configured to deflect a light flux from the light source, and an imaging optical system configured to guide the light flux deflected at the deflector onto a scanned surface. The imaging optical system consists of a single imaging optical element, wherein, on the optical axis of the imaging optical system, the conditions 0.15?T2/Sk?0.3 and 0.03?d/K?0.08 are satisfied. A condition 0.3?B?0.6 is satisfied at a condensing position Y where a scanning angle ? is greatest, when the condensing position Y in the main scanning direction on the scanned surface of the light flux deflected at the scanning angle ? by the deflector is expressed by Y=(K/B)×tan(B×?).

Abstract: An optical writing head positioning mechanism includes spacers provided between a latent image carrier for carrying an electrostatic latent image and an optical writing head for exposing the latent image carrier. The spacers each include at least one carrier contact surface that contacts the latent image carrier and at least one head contact surface that contacts the optical writing head to determine an interval between the latent image carrier and the optical writing head. The latent image carrier is in contact with a cleaning member that cleans a cleaning area on a surface of the latent image carrier. In at least one of the spacers, the at least one carrier contact surface includes plural carrier contact surfaces not disposed on edges of the cleaning area, and one of the edges of the cleaning area is located between two adjacent ones of the plural carrier contact surfaces.

Abstract: There is provided an optical scanning device and an image forming apparatus including the optical scanning device. The optical scanning device includes an optical box containing light source units, a rotating polygon mirror, and a motor. In order to prevent the entire optical box from being deformed by deformation occurring in the installation region due to heat of the driving unit, the optical box includes a connection region between a second sidewall and an installation region where a driving unit is installed. The optical box further includes regions provided next to the connection region and having heights different from each other. A concave portion is formed in the connection region.

Abstract: Provided is a printing apparatus including: a photosensitive drum; a substrate including multiple formable regions in each of which corresponding one of multiple light emitting elements is formable; and a lens array, in which the substrate is arranged in a manner that a longitudinal direction of the substrate is parallel to a rotary shaft of the photosensitive drum, in which the substrate includes m formable region rows, where m is an integer number equal to or greater than 2, each of the m formable region rows including n formable regions, where n is an integer number equal to or greater than 1, arranged in a line along the longitudinal direction of the substrate, and in which one of the multiple light emitting elements formed in any one of m formable regions that are located in a predetermined column of the m formable region rows is turned on.

Abstract: A light source driver includes a controller which outputs an undershoot current in synchronization with lighting complete timing in lighting information, wherein the controller is configured to output the undershoot current such that a voltage in a light source when the output of the undershoot current is complete is equal to a voltage in the light source before being turned on.

Abstract: A light scanning apparatus, including: a light source; a deflector configured to deflect the light beam from the light source to scan a photosensitive member; an optical member configured to guide the light beam; a housing including a housing engaging portion and a supporting portion configured to support the optical member; a leaf spring including a pressing portion and a leaf spring engaging portion; and an abutment portion, wherein, in a process in which the housing engaging portion and the leaf spring engaging portion are moved from a second state in which the leaf spring engaging portion is not engaged with the housing engaging portion to a first state in which the leaf spring engaging portion is engaged with the housing engaging portion, the pressing portion is moved from the abutment portion to the optical member.

Abstract: Included is an image bearing member; an exposure unit configured to form electrostatic latent images by scanning light on the image bearing member and to change the amount of light along the scanning direction of the light; a forming unit configured to form a toner patch on the basis of the electrostatic latent image formed by a plurality of different light amounts, to adjust the light amount of the exposure unit; a detection unit configured to detect the toner patch; and a control unit configured to adjust the light amount of the exposure unit along the scanning direction of the light depending on the detection result by the detection unit. The control unit changes the light amount of the exposure unit along the scanning direction of the light over a portion of regions rather than all regions in the scanning direction when forming the toner patch.