Abstract: An image forming apparatus which obtains rotational variance factors of an intermediate transfer belt for each of plurality of colors based on locations with respect to second pattern image being obtained by a location calculation unit, corrects the location obtained with respect to a first pattern image based on the rotational variance factor obtained with respect to the color of the first pattern image, obtains an offset of another color with respect to a reference color based on the location after correction, and performs color registration based on the obtained offset to reduce the offset.

Abstract: An image forming apparatus includes an image bearing member, a plurality of developing devices, a transfer device, a moving device, a color drift detector, a test pattern forming device, and a color drift correction device. The test pattern forming device forms a test pattern on the image bearing member. The color drift correction device corrects the color drift in a separating state in which the image bearing member and the transfer device are separated from each other. The test pattern forming device forms the test pattern again in an area on the image bearing member contacting the transfer device but not pressed by the transfer device after the color drift correction device corrects the color drift in the separating state, and the color drift correction device corrects the color drift in the contact state in which the image bearing member and the transfer device are in contact with each other.

Abstract: The device comprises: a light emission control unit forming an latent image on a photoconductor; a correction value calculation unit calculating a correction pattern for correcting a transfer position where a developer image of the latent image transfers to a conveying member; and an angle adjustment processing unit that determines an angle of an oblique line pattern included in the correction pattern on the basis of a detection signal of an angle adjustment pattern including a plurality of continuous oblique line patterns, wherein the light emission control unit controls a light to emit so that a plurality of oblique line patterns having different inclinations relative to a conveying direction of the conveying member are continuously formed to draw the angle adjustment pattern, and controls the light to emit so that an oblique line pattern having the determined angle is formed in the correction pattern to draw the correction pattern.

Abstract: A control portion controls a drive of rotation of an image carrier and registers a second index with a first index passing through a transfer position at real time at the time of image formation. Before starting the image formation, the toner image forming portion is controlled to adjust misalignment between the first index and the second index. Accordingly, the second index is formed at a position on the image carrier which is registered with the first index in advance, so that a large amount of control for compensating a large amount of phase misalignment is no longer necessary.

Abstract: In an image forming apparatus that forms an electrostatic latent image for detection on a photosensitive member by light irradiation and performs color-misregistration correction control on the basis of detection of a change in detection current due to the detecting electrostatic latent image passing through a processing unit disposed close to the periphery of the photosensitive member, the intensity of at least one of the apply voltage of the processing unit and the output of the light irradiation unit is set higher than that during normal image formation.

Abstract: An image forming apparatus includes an image forming unit, a belt position detection unit to detect a position of a transfer belt in a rotating shaft direction of a driving roller, and a roller driving unit to tilt a steering roller to control the position of the transfer belt in the rotating shaft direction of the driving roller. In addition, a storage unit stores a reference position of the steering roller and a reference position of the transfer belt, and a control unit controls a formation position of the latent image, in a rotation axis direction of each photosensitive member, formed on each of a plurality of photosensitive members by the image forming unit based on a position of the transfer belt, in the rotating shaft direction of the driving roller, with respect to a detected reference position of the transfer belt and a tilt amount of the steering roller controlled by the roller driving unit with respect to the reference position of the steering roller.

Abstract: An image forming apparatus, a color registration test pattern of the image forming apparatus, and a method of forming the color registration test pattern are provided. A time required for color registration may be reduced by minimizing a region in which a color registration test pattern is formed on an intermediate transfer body. A control method of the image forming apparatus, which includes photosensitive media arranged side by side to correspond to colors in a rotation direction of the intermediate transfer body, includes forming first patterns of the colors arranged in a single row in a sub-scanning direction in a first region of the intermediate transfer body over a single-rotation period of the photosensitive media, and forming second patterns of the colors arranged in a single row in the sub-scanning direction in a second region of the intermediate transfer body over another single-rotation period of the photosensitive media.

Abstract: A method of controlling performance of auto color registration (ACR) of a color image forming apparatus, and an image forming apparatus using the same are provided. The method of controlling performance of ACR includes forming a composite black image on a transfer belt, sensing the composite black image by using a sensor, measuring the sensed composite black image, and performing ACR correction when a measured width of the composite black image is greater than a previously set value. Accordingly, it is possible to prevent unnecessary performance of ACR control when no color misregistration has occurred. In this way, ACR control is performed in as short a time as possible so that performance of the image forming apparatus may be improved. Also, it is possible to prevent waste of ACR performance time and life span reduction of a driving source for ACR.

Abstract: An image forming apparatus includes a patch forming unit configured to form a patch group containing patch subgroups arranged in a sub-scanning direction. Each of the patch subgroups contains a reference color patch and a color patch of a different color. The reference color patches are shifted from each other in a main-scanning direction. The color patches are shifted from each other in the main-scanning direction. The patch subgroups include reference patch subgroups in each of which the reference color patch covers over the color patch and detection patch subgroups in each of which at least part of the color patch does not overlap with the reference color patch. Center positions of non-overlapping portions of the color patches that do not overlap with the reference color patches in the main-scanning direction are located at substantially a same position in the patch group.

Abstract: An image forming apparatus includes: an endless belt having a surface on which a first image and a second image are formed; a drive roller that drives the belt; a tension roller that supports the belt on a downstream side of the drive roller; a first image forming unit disposed at a first position on an upstream side of the tension roller; a second image forming unit disposed at a second position on an upstream side of the first image forming unit; and a controller that obtains first and second image data, corrects the first and second image data so as to compensate a distortion of the second image occurring during conveyance of the second image from the second position to the first position, and causes the first and second image forming units to form the first and second images based on the corrected first and second image data.

Abstract: The exposing unit emits a pair of light beams deflected to reverse scanning directions each other by a rotary polyhedron. The pattern creation unit creates color misregistration detection patterns on the transfer unit by the toner image in a reference color formed by a light beam emitted from an exposing unit and the toner image in an adjustment color formed by the other light beam having a different scanning direction. The color misregistration collection unit, on the basis of the image forming position of the toner image in the reference color, moves an image forming position of the toner image in each color formed by the light beam having the scanning direction opposite to the light beam corresponding to the reference color according to the color misregistration adjustment amount detected by the adjustment amount detection unit.

Abstract: An image forming apparatus includes a color registration error amount calculation unit that calculates a color registration error amount from a first test pattern; a correction information obtaining unit that obtains a correction information for correcting an image on a back surface based on previously obtained contraction information of a printing paper after printing an image on a front surface when printing on both surfaces; and an image data correction unit that corrects the image on the back surface based on the color registration error amount calculated by the color registration error amount and the correction information obtained by the correction information obtaining unit.

Abstract: A color image forming apparatus includes a first temperature detection unit configured to detect a temperature of an exposure device, a second temperature detection unit configured to detect a temperature of a photosensitive member, a color registration pattern detection unit configured to detect a color registration pattern formed on a transfer member, an actual-measurement-based color registration adjustment value calculation unit configured to calculate an actual-measurement-based color registration adjustment value from a result of the detection of the color registration pattern detection unit, and a prediction-based color registration adjustment value calculation unit configured to calculate a prediction-based color registration adjustment value from the temperature of the exposure device detected by the first temperature detection unit and the temperature of the photosensitive member detected by the second temperature detection unit.

Abstract: An image forming apparatus and a control method enhancing ACR (Auto Color Registration) performance by optimizing ACR patterns are provided. The apparatus includes a photosensitive drum, an exposure unit to radiate the drum to form an latent image, a developing unit supplying color toner corresponding to the latent image, and a transfer belt to which the toner image is transferred. A pattern generating unit forms a latent image corresponding to a predetermined ACR pattern on the drum to form the ACR pattern on the transfer belt, and allowing amounts of gap changes of sub patterns, which form the ACR pattern, to have an average value of about 0, the gap change of sub patterns caused by an AC component generated from a rotation of the drum. A pattern detecting unit detects a pattern formed on the transfer belt, and an ACR executing unit calculates offsets to correct errors.

Abstract: A Zener diode contacts an inner periphery surface of an intermediate transfer belt, and an opposing roller which opposes a detecting member is electrically insulated, in a configuration where transfer is performed at multiple photosensitive drums while an electrical current is applied in a peripheral direction of the intermediate transfer belt.

Abstract: An image forming apparatus includes an image bearing member, a controller controls a first and the second image forming unit to form a measurement image on the image bearing member, wherein the measurement image is composed with a first measurement image having a first color, and a second measurement image having a second color with a lower reflectance than the first color, a radiation unit emits a irradiation light to the measurement image, a light receiving unit receives a reflected light from the measurement image, a comparison unit compares a light amount of the reflected light from the measurement image with a threshold value, and a changing unit increases the threshold value, if a measurement time period during which a light amount of the reflected light from the measurement image is equal to or greater than the threshold value is longer than a predetermined time period.

Abstract: An image processing apparatus of one aspect of this invention detects a specific pattern corresponding to a fine pattern in the input image data, and detects pixels corresponding to the specific pattern. Furthermore, the image processing apparatus specifies a pixel, which corresponds to the detected specific pattern, and a degree of juxtaposition color mixture of which does not exhibit a value within a predetermined appropriate range, and executes, for the input image data, image processing (blur processing) for adjusting the degree of juxtaposition color mixture, which represents a color mixture state when dots of respective colors formed using pixel values of respective colors included in the input image data are superposed on each other, of the specified pixel to fall within the predetermined appropriate range.

Abstract: An image forming apparatus includes a first detection unit including a first light receiving element arranged in a direction of normal reflected light reflected from a first positional deviation correction pattern, a second detection unit including a second light receiving element arranged in a different direction of normal reflected light reflected from a second positional deviation correction pattern, and a control unit configured to correct a positional deviation based on a value calculated from a first detection result detected by the first detection unit and a second detection result detected by the second detection unit.

Abstract: A pattern detection sensor includes a light emitting element for specular reflection, a light emitting element for diffuse reflection light, and a light receiving element. When turning on the light emitting element for specular reflection to emit light, a light source switching unit keeps off the light emitting element for diffuse reflection light. When turning on the light emitting element for diffuse reflection light to emit light, the light source switching unit keeps off the light emitting element for specular reflection. An offset detection unit detects a difference between a detection timing by specular reflection light and another detection timing by diffuse reflection light as an offset value (mutual detection error).

Abstract: Image forming apparatus corrects for color slippage in toner image of a plurality of colors that have been sequentially transferred onto moving transfer target from the plurality of respective image carriers. A temperature of an interior of image-developing device is detected by first detection part, and a temperature of an interior of exposure device is detected by second detection part. First determination part determines whether or not the correction with respect to color slippage during temperature elevation is to be carried out, on the basis of first temperature detected by first detection part and second temperature detected by first detection part earlier than first temperature. Second determination part determines whether or not the correction with respect to color slippage during temperature decrease is to be carried out, on the basis of third temperature detected by second detection part and fourth temperature detected by second detection part earlier than third temperature.

Abstract: A method for color registration includes determining if color registration is necessary, and if color registration is necessary, rotating an image forming medium and setting an optimum luminance of a registration sensor with respect to a rotating surface of the image forming medium, confirming an area with an undesirable surface condition on the image forming medium using luminance detected with respect to the rotating surface of the image forming medium during the setting of the optimum luminance, forming a preset mark for color registration adjustment excluding the area confirmed to have an undesirable surface condition, and carrying out color registration adjustment using the optimum luminance set with respect to the formed mark.

Abstract: To accomplish this, an image forming apparatus of the present invention determines whether the temperature of an exposure unit is changing at a predetermined gradient or more, detects misregistration by forming patches and executes first registration adjustment amount calculation processing for detecting a registration adjustment amount, in a case where the temperature is not changing at the predetermined gradient or more, and executes second registration adjustment amount calculation processing for predicting the misregistration amount according to the temperature of the exposure unit measured by a first sensor, in a case where the temperature is changing at the predetermined gradient or more.

Abstract: An image forming apparatus and an auto color registration method of the same which prints a color image by single pass, the image forming apparatus including: a plurality of developing units which each develops a color image in a predetermined color; a transfer unit which transfers the color image developed by developing units to the print medium and include a transfer belt rotatably installed on a transfer path; a first detector provided in a predetermined location of the transfer belt to face the transfer belt and detects any defect from a surface of the transfer belt; a second detector provided in a predetermined location of the transfer belt to face the transfer belt and detects a test pattern of an auto color registration (ACR) error transferred to the transfer belt; and a controller which adjusts the ACR error based on data detected by the first detector and the second detector.

Abstract: An image forming apparatus includes a registration unit which performs color registration correction by using a registration sensor, an image forming unit which forms a preset first mark whose range is greater than a range recognizable by the registration sensor on an image forming medium, and a storage which stores a specific area of an image forming medium recognizable by the registration sensor by using the formed preset first mark. The image forming apparatus further includes a controller which controls the image forming apparatus to form a preset second mark to perform color registration correction within a range recognizable by the registration sensor by using information regarding the specific area which was previously stored in the storage, and the controller controls the registration unit to perform color registration correction by using the formed preset second mark.

Abstract: An image forming apparatus includes a process unit arranged in the vicinity of the circumference of each photosensitive member and the process unit is configured to act on the photosensitive member in forming a toner image thereon. The image forming apparatus detects a time period since a laser beam emission unit emits a laser beam to the photosensitive member to form an electrostatic latent image for detection until the formed electrostatic latent image for detection or a toner image based on the electrostatic latent image for detection reaches the process unit, and performs color misregistration correction control based on the result of detection. In this case, a control unit at least decreases the light amount of a pre-exposure LED when the electrostatic latent image for detection passes through a position facing the pre-exposure LED.

Abstract: An image forming apparatus comprising: at least one first image carrier; an image writing unit configured to write the electrostatic latent image including a test pattern; a second image carrier configured to move along a transfer position facing to the at least one first image carrier; an image forming unit configured to transfer the subject image transferred on the second image carrier to a transfer material; a detector configured to detect the test pattern image; and a controller configured to correct an image forming condition of the subject image, wherein during a period from the detection of the test pattern to the writing a subsequent subject image, the controller calculates a correction amount of a correction matter, and reflects the calculated amount in the image forming condition of the subject image.

Abstract: In test modes correcting at least one of an exposure timing of a first exposure portion and an exposure timing of a second exposure portion after transferring test toner images on an endless belt, a control portion is configured to be able to start the exposure of the first exposure portion after when a position of an intermediate transfer belt located at a second developing bias when a developing bias is started to be applied to the second developing portion.

Abstract: An image forming apparatus includes: image-forming units of multiple colors that form images on an image carrier in such a manner that the images are overlaid on one another, and a determination unit that determines necessity of position alignment correction of an image of each color accompanying image formation in accordance with a degree of change of image formation environment from when correction was executed in the past and a combination of colors used for the image formation.

Abstract: An image forming apparatus includes an automatic acquiring unit which is configured to form a mark for detecting at least one of positional deviation and density deviation and acquire an amount of deviation by measuring the mark, an image forming unit which is configured to form an image while adjusting at least one of positional deviation and density deviation based on a correction value specified by the amount of deviation, and an output unit which is configured to execute at least one of a pattern printing process and a notifying process when an amount of deviation within a permissible range is not acquired by the automatic acquiring unit. The pattern printing process includes printing a pattern image for specifying a correction value on a recording sheet. The notifying process includes making notification for prompting execution of the pattern printing process.

Abstract: An image forming apparatus includes: an image forming unit configured to form developer images of a plurality of colors on an image carrier; and a control unit configured to execute a first correction control and a second correction control that has a higher correction precision than the first correction control in order to correct misregistration between the developer images formed by the image forming unit. The control unit is further configured to execute the second correction control when a cumulative correction error, which is a cumulative value of correction error occurring when performing misregistration correction using the first correction control, exceeds a first threshold.

Abstract: The invention relates to a document-processing system, which includes a device suitable for supplying consecutive recorded images as well as a background surface, comprising a step of storing a standard background surface image. The next step consists of detecting the presence of a document moving across a series of recorded images relative to the standard background surface image. The following step consists of monitoring the movement of the document within the series of images. The end of the movement of the document is then detected and the standard background surface image is updated. The movement of the document is monitored by determining document-extraction masks respectively for the recorded images, the extraction mask of a recorded image being obtained according to an entropy card of the recorded image relative to said standard background surface image.

Abstract: Disclosed herein are an image forming apparatus and a control method thereof. In the image forming apparatus, an intermediate transfer member is provided with a position identification mark, to enable sensing of a position of the intermediate transfer member after a cleaning unit is completely spaced apart from the intermediate transfer member. An image formation/transfer position can be controlled in response to a sensing signal of the position identification mark, so that respective colors of developer images may be formed and transferred to the same position on the intermediate transfer member in a state in which contact between the cleaning unit and the intermediate transfer member is released. This minimizes and/or prevents color discrepancy between the respective colors of developer images.

Abstract: A light irradiation unit forms an electrostatic latent image pattern on a photosensitive member by irradiating the photosensitive member and a shielding unit with light. A detection unit detects, in a rotation direction of the photosensitive member, timing at which a surface potential of the photosensitive member changes depending on displacement of the electrostatic latent image pattern in an axial direction of the photosensitive member.

Abstract: The image forming apparatus includes process units that are closely arranged around respective photosensitive members and act on the photosensitive members, a light emission section that forms an electrostatic latent image for detection on the photosensitive member and a detection section that detects that the electrostatic latent image passes through a position facing the process unit, and a control section that performs misregistration correction control based on the detection result.

Abstract: An image reading apparatus according to one aspect of the present disclosure includes a document sheet table, a first carriage, a photoelectric converting portion, and a position detecting portion. First carriage has lighting portion. Position detecting portion detects initial position in reciprocating of first carriage. Lighting portion includes: light guide member on which the light from light source is incident, and which guides incident light in primary scanning direction and applies the light to document sheet table; and heat dissipating member that dissipates heat generated in light source. Position detecting portion includes: light emitter that emits light; light receiver that receives light emitted from light emitter; and detection member that moves in secondary scanning direction along with reciprocating of first carriage, in order to detect initial position of first carriage.

Abstract: An image forming apparatus includes upstream-side and downstream-side detection parts and a control section. The detection parts are disposed on a moving path of an intermediate transfer belt or a conveyor belt and detect a speed of the belt. The control section performs control to correct color misregistration of images composed of colors to be formed on the intermediate transfer belt or a recording medium conveyed by the conveyance belt on the basis of the detection result. The control unit calculates a difference between the speed detected by the upstream-side detection part and the speed detected by the downstream-side detection part after a predetermined time elapses since the upstream-side detection part detects the speed and performs the control on the basis of the difference. The predetermined time is obtained by dividing a distance between the detection parts by a target speed of the belt.

Abstract: The image forming apparatus detects a color deviation amount in a timing when a developing roller separates from or contacts a photosensitive drum to set a difference in peripheral velocities between the photosensitive drum and an intermediate transfer belt or a transfer material conveying belt based on the color deviation amount and information about the use degree of the intermediate transfer belt.

Abstract: An image forming apparatus can transfer a plurality of color component images onto a surface of a recording medium to form an image on the recording medium. The image forming apparatus includes a pattern generation part to generate information about an alignment pattern to be used for a calibration of an image forming, a plurality of stations each including a photosensitive drum to form an alignment pattern corresponding to each of a plurality of color components onto a carry belt or the recording medium, and a read part to detect a plurality of alignment patterns formed by the plurality of stations.

Abstract: An image forming apparatus includes an image bearing member, a medium transport member, an image transfer member, a first detection member detecting widthwise deviation of the image bearing member, a first deviation correcting member tiltable relative to the width direction and supporting the image bearing member, a first correction control section tilting the first deviation correcting member to correct deviation of the image bearing member, a second detection member detecting widthwise deviation of the transport member, a second deviation correcting member tiltable relative to the width direction and supporting the transport member, and a second correction control section tilting the second deviation correcting member to correct deviation of the transport member.

Abstract: An image forming apparatus includes a control unit configured to form electrostatic latent images for correction on a photosensitive member; a voltage application unit configured to apply a voltage to a process unit; a current detection unit configured to detect a current to the voltage application unit via the process unit when the voltage is applied to the process unit; and a conversion unit configured to convert an output value detected by the current detection unit such that a variation range of the output value detected by the current detection unit at a formation period of the electrostatic latent image for correction becomes larger than a variation range of the output value detected by the current detection unit at a one-rotation period of the photosensitive member on which the electrostatic latent image is not formed.

Abstract: An image forming apparatus includes a rotating member; a forming unit for each of a plurality of colors used in image formation, configured to form a developer image of the corresponding color on the rotating member or on a recording medium on the rotating member; a driving unit configured to rotate the rotating member; a period detection unit configured to detect a rotation period of the rotating member; and a control unit configured to, according to a detection result detected by the period detection unit, obtain a variation in the rotation period of the rotating member due to a change in the driving unit, and perform correction control for misregistration in the developer image formed on the rotating member or on the recording medium on the rotating member by the forming unit.

Abstract: An image formation method includes: a first image formation misregistration correction processing that causes each image formation unit to form a misregistration amount detection pattern, obtains an image formation misregistration amount by detecting the patterns, and corrects an image formation misregistration based on the obtained image formation misregistration amount; comparison processing that compares a previous image formation misregistration amount with a latest image formation misregistration amount; and a second image formation misregistration correction processing that causes each image formation unit to form new misregistration amount detection patterns, obtains a new image formation misregistration amount by detecting the new patterns and corrects the image formation misregistration based on the obtained new image formation misregistration amount when receiving a new print job and if a difference between the previous image formation misregistration amount and the latest image formation misregistr

Abstract: An image forming apparatus, including: an image bearing member; a charging device configured to charge a surface of the image bearing member; a power source configured to apply a voltage to the charging device; an exposure device configured to irradiate the surface of the image bearing member with a light beam to form an electrostatic latent image; a developing device configured to develop the latent image into a toner image; and a reading device configured to read a color registration toner image obtained by developing, by the developing device, a color registration electrostatic latent image formed on the surface of the image bearing member by the exposure device within a period from a time when the power source is started up to apply the voltage to the charging device to a time when a potential of the surface of the image bearing member reaches a potential for usual image formation.

Abstract: An image forming apparatus includes an intermediate transfer body; a generating unit generating test pattern data; a storage unit storing a color displacement amount; a correcting unit correcting the test pattern data and image data based on the color displacement amount currently stored in the storage unit; a forming unit forming a test pattern based on the test pattern data corrected by the correcting unit on the intermediate transfer body at predetermined intervals, and forming an image based on the image data corrected by the correcting unit on the intermediate transfer body; a detecting unit detecting the test pattern formed on the intermediate transfer body; an updating unit determining an amount of change of the color displacement amount from a result of detection by the detecting unit, and updating the color displacement amount stored in the storage unit by using the amount of change of the color displacement amount.

Abstract: An image forming apparatus reduces superimposing misalignment due to skew difference and registration difference and superimposing misalignment of visible image due to periodic position error generated on a plurality of latent image carriers respectively by correcting image information. A controller of the image forming apparatus has a deviation amount storing unit store data of magnification error in the sub-scanning direction e, executes rotation posture determining process that sets writing rotation posture as rotation angle posture at the time of starting writing latent image on photoconductors for Y, M, C, and K respectively, and has an image data correcting unit correct the image information based on the determined writing rotation posture and various error data (including magnification error in the sub-scanning direction e).

Abstract: An image forming apparatus includes: a conveyance member; a detection unit which outputs a detection signal according to a mark for image formation condition correction; an image forming unit which forms a print image and the mark; and a change unit which changes at least one of a printing reference position and a mark reference position such that an offset amount between the printing reference position and the mark reference position becomes larger as an angle difference between a sub-scanning direction and a conveyance direction of the conveyance member is larger, wherein the printing reference position is a basis of determining a formation position of the print image in a main scanning direction and the mark reference position is a basis of determining at least one of a formation position and a size of the mark in the main scanning direction.

Abstract: An image forming apparatus, which achieves reduced color registration time and real-time calibration of color position shift, and a control method for the same, is provided.

Abstract: An image forming apparatus includes first and second image bearing members configured to bear electrostatic latent images, a rotatable belt configured to receive toner images from the first and second image bearing members, and an executing portion configured to execute an operation in a correction mode for determining timing at which formation of the electrostatic latent image starts on at least one of the first and second image bearing members with respect to a widthwise direction of the belt between test toner images transferred onto the belt from the first and second image bearing members. In addition, first and second detecting members detect positions of the belt with respect to the widthwise direction, and a calculating portion calculates a movement distance of a predetermined point on the belt with respect to the widthwise direction.

Abstract: A controller includes a pattern forming unit that forms patterns multiple times on a first image holding member which is driven such that a surface thereof is circulated, a first detection unit that optically detects the patterns formed on the first image holding member by the pattern forming unit, a second detection unit that optically detects the patterns transferred from the first image holding member to a recording medium which is transported in a set transport direction, and an adjustment unit that adjusts a length in the transport direction of an image transferred to the recording medium on the basis of a time interval when the patterns are detected by the first detection unit and a time interval when the patterns are detected by the second detection unit.

Abstract: A method for measuring Side 1 to Side 2 image on paper misregistration includes using a series of lines printed on both sides of a substrate, such as, paper. The paper is passed in front of an in-line spectrophotometer or densitometer. The amount of image “show through” is measured and correlated to an amount of misregistration.