Image forming apparatus, correction control method, and medium

Abstract

The application relates to an image forming device, a correction control method and a medium, the device comprising: an image carrier; a pattern forming unit, configured to form a first detection pattern for concentration detection on the image carrier, the first detection pattern comprising a first sub-pattern of black color and a second sub-pattern of non-black color; a first sensor, configured to perform concentration detection on the first sub-pattern; a second sensor, configured to perform concentration detection on the second sub-pattern; the pattern forming unit is further configured to form a second detection pattern for out-of-gamut detection on the image carrier, the second detection pattern comprising a third sub-pattern of full color and a fourth sub-pattern of full color; the first sensor is further configured to perform out-of-gamut detection on the third sub-pattern; and the second sensor is further configured to perform out-of-gamut detection on the fourth sub-pattern. According to the technical scheme, the time cost of correction and the use cost of the sensor can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of image forming, and in particular to an image forming apparatus, a correction control method and a medium. BACKGROUND

[0002] Some existing image forming devices can perform color image forming jobs. For example, an image forming device can perform a color printing job based on four colors of toner, i.e., black (K), magenta (M), cyan (C) and yellow (Y).

[0003] Before a job, an image forming device usually performs some corrections, including toner density detection, misregistration detection, etc., to ensure that the image forming device more accurately controls the density of each color toner and the imaging position, and improves the quality of image forming.

[0004] There are image forming apparatuses having a plurality of image forming units and forming a multi-color image by forming images of various colors using the image forming units and then transferring the images to an intermediate transfer member or recording material in an overlapping manner. In this type of image forming apparatus, so-called color shift (misregistration) occurs, i.e., the relative positions between the images formed by the image forming units do not match. Misregistration occurs due to installation errors of the components constituting the image forming units, and due to changes in the relative positions of these components due to changes in environmental conditions such as temperature. Misregistration also occurs due to uneven rotation of a rotating driven component, changes in rotation speed, etc. In addition, color balance (so-called color tone) changes due to changes in the image density of various colors due to conditions such as the use environment and the number of printed sheets.

[0005] The inventors of the present application found in their research that the defects of the prior art are on the one hand that different corrections are performed in different time sequences, i.e., density correction and misregistration detection are detected at different times, and different detection images are formed on a transfer belt to perform detection, thereby requiring a large time cost for detection before image forming jobs can be performed.

[0006] The defects of the prior art are also related to the use cost of sensors. In the prior art, when misregistration detection is performed, the same color images are formed on the left and right sides of the transfer belt, and IDC sensors are arranged on the left and right sides to perform detection. Due to the properties of the toner colors, black toner needs to be detected by a mirror reflection channel in the sensor, and other color toners need to be detected by a diffuse reflection channel, so mirror reflection channels and diffuse reflection channels need to be arranged in the left and right sensors, and the use cost of the sensors is high. SUMMARY

[0007] Embodiments of the present application provide an image forming apparatus, a correction control method and a medium, which can reduce the time cost of correction and the use cost of sensors.

[0008] In a first aspect, the present application provides an image forming apparatus, comprising:

[0009] an image carrier;

[0010] a pattern forming unit configured to form a first detection pattern for density detection on the image carrier, the first detection pattern comprising a first sub-pattern in black color and a second sub-pattern in non-black color;

[0011] a first sensor configured to perform density detection on the first sub-pattern;

[0012] a second sensor configured to perform density detection on the second sub-pattern;

[0013] the pattern forming unit is further configured to form a second detection pattern for out-of-gamut detection on the image carrier, the second detection pattern comprising a third sub-pattern in full color and a fourth sub-pattern in full color, the third sub-pattern being different from the fourth sub-pattern;

[0014] the first sensor is further configured to perform out-of-gamut detection on the third sub-pattern;

[0015] the second sensor is further configured to perform out-of-gamut detection on the fourth sub-pattern.

[0016] In a feasible implementation manner of the first aspect, the pattern forming unit is configured to form the first sub-pattern and the third sub-pattern on one side of the image carrier, and to form the second sub-pattern and the fourth sub-pattern on the other side of the image carrier.

[0017] In a feasible implementation manner of the first aspect, the first sensor comprises a specular reflection detection channel, and is configured to perform density detection on the first sub-pattern in black color based on the specular reflection detection channel.

[0018] The first sensor further comprises a diffuse reflection detection channel, and is configured to perform out-of-gamut detection on the third sub-pattern in full color based on the specular reflection detection channel and the diffuse reflection detection channel.

[0019] In a feasible implementation manner of the first aspect, the fourth sub-pattern comprises a pattern in non-black color, and a pattern in which one of the non-black colors is superimposed on black color.

[0020] With reference to the first aspect, in a possible implementation manner, the second sensor includes a diffuse reflection detection channel, and the second sensor is configured to perform the concentration detection on the second sub-pattern of non-black colors based on the diffuse reflection detection channel.

[0021] The second sensor is further configured to perform the out-of-gamut detection on the fourth sub-pattern of non-black colors and the pattern of one non-black color superimposed with black.

[0022] According to a second aspect, a correction control method is provided, and the method is applied to an image forming apparatus, and the method includes:

[0023] forming a first detection pattern for concentration detection on an image carrier of the image forming apparatus, the first detection pattern including a first sub-pattern of black and a second sub-pattern of non-black;

[0024] controlling a first sensor to perform concentration detection on the first sub-pattern, and controlling a second sensor to perform concentration detection on the second sub-pattern;

[0025] forming a second detection pattern for out-of-gamut detection on the image carrier, the second detection pattern including a third sub-pattern of full color and a fourth sub-pattern of full color, the third sub-pattern being different from the fourth sub-pattern;

[0026] controlling the first sensor to perform out-of-gamut detection on the third sub-pattern, and controlling the second sensor to perform out-of-gamut detection on the fourth sub-pattern.

[0027] With reference to the second aspect, in a possible implementation manner, the first sub-pattern and the third sub-pattern are formed on one side of the image carrier, and the second sub-pattern and the fourth sub-pattern are formed on the other side of the image carrier.

[0028] With reference to the second aspect, in a possible implementation manner, the first sensor includes a specular reflection detection channel, and the first sensor is configured to perform the concentration detection on the first sub-pattern of black based on the specular reflection detection channel; and the first sensor further includes a diffuse reflection detection channel, and the first sensor is configured to perform the out-of-gamut detection on the third sub-pattern of full color based on the specular reflection detection channel and the diffuse reflection detection channel.

[0029] With reference to the second aspect, in a possible implementation manner, the fourth sub-pattern includes a pattern of non-black colors and a pattern of one non-black color superimposed with black.

[0030] With reference to the second aspect, in a possible implementation, the second sensor includes a diffuse reflection detection channel, and the second sensor performs the concentration detection on the second sub-pattern of non-black colors based on the diffuse reflection detection channel; and the second sensor performs the out-of-gamut detection on the fourth sub-pattern of non-black colors and the pattern of one non-black color superimposed with black based on the diffuse reflection detection channel.

[0031] With reference to the third aspect, the present application provides a computer readable storage medium, which includes a stored program, and the program controls a device where the storage medium is located to perform the calibration control method of the second aspect when the program is executed.

[0032] The image forming apparatus and the calibration control method provided by the present application form a first detection pattern for concentration detection on an image carrier, the first detection pattern including a first sub-pattern of black and a second sub-pattern of non-black, control a first sensor to perform concentration detection on the first sub-pattern, and control a second sensor to perform concentration detection on the second sub-pattern, so as to complete the concentration detection. The present application also forms a second detection pattern for out-of-gamut detection on the image carrier, including a third sub-pattern and a fourth sub-pattern, controls the first sensor to perform out-of-gamut detection on the third sub-pattern, and controls the second sensor to perform out-of-gamut detection on the fourth sub-pattern, so as to simultaneously perform concentration calibration and out-of-gamut detection, and reduce the time cost of calibration. Meanwhile, the third sub-pattern and the fourth sub-pattern are different, and there is no need to set a specular reflection detection channel and a diffuse reflection detection channel on the first sensor and the second sensor, so as to reduce the use cost of the sensors. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor based on these drawings.

[0034] Figure 1 is a structural schematic diagram of an image forming apparatus provided by an embodiment of the present application;

[0035] Figure 2A is a structural schematic diagram of a first sensor in an embodiment of the present application;

[0036] Figure 2B is a structural schematic diagram of a second sensor in an embodiment of the present application;

[0037] Figure 3 is a schematic diagram of a detection image provided by an embodiment of the present application;

[0038] Figure 4 is a flowchart of a correction control method provided by an embodiment of the present application.

[0039] Figure 5 is a schematic diagram of an image forming device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0041] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0043] It should be understood that the term "and / or" used herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0044] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe the terminals, these terminals should not be limited to these terms. These terms are only used to distinguish the terminals from each other. For example, without departing from the scope of the embodiments of the present application, the first terminal can also be referred to as the second terminal, and similarly, the second terminal can also be referred to as the first terminal.

[0045] Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if it is determined" or "if (a stated condition or event) is detected" can be interpreted as "when it is determined" or "in response to determining" or "when (a stated condition or event) is detected" or "in response to detecting (a stated condition or event)".

[0046] Figure 1 is a structural configuration diagram of an image forming device provided by an embodiment of the present application. Figure 1Y, M, C, and K in the drawing mark are yellow, magenta, cyan, and black, respectively. When the colors are not distinguished in the description of the embodiments of the present application, the drawing marks are not attached. Figure 1 The arrow in the drawing indicates the direction of rotation of the corresponding driving member.

[0047] The photosensitive member 122 rotates in the direction of the arrow in the drawing. Figure 1 The charging member 123 charges the surface of the corresponding photosensitive member 122 with a predetermined electric potential. The scanning unit 124 scans and exposes the photosensitive member 122 as an image carrier by using light based on image data corresponding to an image to be formed, thereby forming an electrostatic latent image on the surface of the photosensitive member 122. The developing unit 126 stores carbon powder of a corresponding color and forms an image by developing the electrostatic latent image on the corresponding photosensitive member 122 using the carbon powder. The carbon powder container 125 stores carbon powder of a corresponding color and supplies the carbon powder to the corresponding developing unit 126. The primary transfer unit 127 transfers the image formed on the photosensitive member 122 to the intermediate transfer member 27. At this time, a color image is formed by transferring images of various colors to the intermediate transfer member 27 in an overlapping manner. The intermediate transfer member 27 rotates in the direction of the arrow in the drawing and transports the image on the surface of the intermediate transfer member 27 to an opposite position on the secondary transfer member 129. The image on the intermediate transfer member 27 is transferred to the recording sheet transported along the transport path 130 by the secondary transfer member 129.

[0048] In the embodiments of the present application, a pattern for density detection and a pattern for color registration error detection formed of carbon powder can be formed on the intermediate transfer member 27 and detected by the sensors 101 and 102 provided on both sides opposite to the intermediate transfer member 27, i.e., on both sides of the moving direction of the surface of the intermediate transfer member 27, for example, the sensor 101 is provided at a position opposite to the vicinity of one end of the image forming range in a direction orthogonal to the moving direction of the surface of the intermediate transfer member 27, and the sensor 102 is provided at a position opposite to the vicinity of the other end of the image forming range.

[0049] Figure 2A is a structural schematic diagram of the first sensor 101 in the embodiments of the present application and a schematic diagram of the detection principle thereof.

[0050] The first sensor 101 includes a specular reflection detection channel and a diffuse reflection detection channel. Specifically, the light emitting element 412 emits light at an angle A from the normal direction of the surface of the intermediate transfer member 27. The light emitted by the light emitting element 412 is reflected by the surface of the intermediate transfer member 27 and the image block 411 formed on the surface of the intermediate transfer member 27. The light receiving element 414 of the specular reflection detection channel is arranged to receive the light reflected in a direction at an angle A from the normal direction of the surface of the intermediate transfer member 27. The P wave of the specular reflection is sensitive to black and not sensitive to other colors (C, M, Y), so that the specular reflection detection channel can be used for detecting black (K) toner.

[0051] On the other hand, the light receiving element 413 of the diffuse reflection detection channel is arranged to receive the light reflected in a direction at an angle B different from the angle A from the normal direction of the surface of the intermediate transfer member 27. The S wave of the diffuse reflection is not sensitive to black and is sensitive to other colors (C, M, Y), so that the diffuse reflection detection channel can be used for detecting color (C, M, Y) toner.

[0052] Figure 2B is a structural schematic diagram of a second sensor 102 in an embodiment of the present application and a schematic diagram of the detection principle thereof.

[0053] The second sensor 102 includes a diffuse reflection detection channel. Specifically, the light receiving element 413 of the diffuse reflection detection channel is arranged to receive the light reflected in a direction at an angle B different from the angle A from the normal direction of the surface of the intermediate transfer member 27. The S wave of the diffuse reflection is not sensitive to black and is sensitive to other colors (C, M, Y), so that the diffuse reflection detection channel can be used for detecting color (C, M, Y) toner.

[0054] In an embodiment of the present application, an image forming apparatus is further provided, which can perform concentration detection and color matching inaccuracy detection in the same detection image, reduces the time cost of detection, and reduces the use cost of the sensor.

[0055] Specifically, an image forming apparatus provided by an embodiment of the present application includes:

[0056] an image bearing body;

[0057] a pattern forming unit configured to form a first detection pattern for concentration detection on the image bearing body, the first detection pattern including a first sub-pattern of black and a second sub-pattern of non-black;

[0058] a first sensor configured to perform concentration detection on the first sub-pattern;

[0059] a second sensor configured to perform concentration detection on the second sub-pattern;

[0060] The pattern forming unit is also configured to form a second detection pattern for out-of-gamut detection on the image carrier, the second detection pattern comprising a third sub-pattern in full color and a fourth sub-pattern in full color, the third sub-pattern being different from the fourth sub-pattern;

[0061] The first sensor is also configured to perform out-of-gamut detection on the third sub-pattern;

[0062] The second sensor is also configured to perform out-of-gamut detection on the fourth sub-pattern.

[0063] The image forming apparatus provided by the embodiments of the present application forms a first detection pattern for density detection on the image carrier, the first detection pattern comprising a first sub-pattern in black and a second sub-pattern in non-black, controls the first sensor to perform density detection on the first sub-pattern, and controls the second sensor to perform density detection on the second sub-pattern, so as to complete the density detection. The present application also forms a second detection pattern for out-of-gamut detection on the image carrier, the second detection pattern comprising a third sub-pattern and a fourth sub-pattern, controls the first sensor to perform out-of-gamut detection on the third sub-pattern, and controls the second sensor to perform out-of-gamut detection on the fourth sub-pattern, so as to simultaneously perform density correction and out-of-gamut detection, thereby reducing the time cost of correction. Meanwhile, the third sub-pattern is different from the fourth sub-pattern, and there is no need to set a specular reflection detection channel and a diffuse reflection detection channel on the first sensor and the second sensor, thereby reducing the use cost of the sensors.

[0064] In a more detailed embodiment of the present application, the detection process of the image forming apparatus and the density detection and out-of-gamut detection thereof will be described.

[0065] Specifically, the image forming apparatus comprises an image carrier. In the embodiments of the present application, the image carrier can be but is not limited to an intermediate transfer belt 27. The intermediate transfer belt is a belt for transferring the supplied printing paper, and forms a detection pattern for detection on the surface in a state that the printing paper has not received the transferred image. The image carrier can also be a medium such as paper directly.

[0066] The image forming apparatus further comprises a pattern forming unit, which can comprise, for example, a photosensitive member 122 corresponding to each color, a charging member 123, a scanning unit 124, a developing unit, and the like, for forming a detection pattern on the intermediate belt. The pattern forming unit further comprises a necessary control unit for controlling the cooperation of each member. The pattern forming unit can also comprise a storage unit for storing a pre-set detection pattern.

[0067] Figure 3 A detection schematic diagram formed by the pattern forming unit in an embodiment of the present application on the intermediate transfer belt 27.

[0068] Figure 3The arrow direction in the middle indicates the direction of the movement of the surface of the intermediate transfer belt 27. The first sensor 101 detects the detection pattern on the side of the movement direction of the intermediate transfer belt 27. The second sensor 102 detects the detection pattern on the other side of the movement direction of the intermediate transfer belt 27.

[0069] As shown in FIG. 1, the image forming apparatus 1 includes a plurality of image forming units 10, 20, 30, 40, and a plurality of sensors 101, 102, 103, 104. Figure 3 The image forming units form images of different colors on the image bearing bodies. The image forming units form images of different colors on the image bearing bodies. The image forming units form images of different colors on the image bearing bodies. The image forming units form images of different colors on the image bearing bodies.

[0070] Specifically, the first sub-pattern is a black pattern, for example, a black color block 210K, and the first sensor 101 can detect the concentration of the black color block based on the specular reflection detection channel.

[0071] The second sub-pattern is a non-black pattern, including a yellow color block 210Y, a magenta color block 210M, and a cyan color block 210C, and the second sensor 102 can detect the concentration of each non-black color block based on the diffuse reflection detection channel.

[0072] In the embodiments of the present application, the image forming apparatus has a plurality of image forming units, and forms a multi-color image by forming images of various colors using the image forming units and then transferring the images to an intermediate transfer member or recording material in an overlapping manner. In this type of image forming apparatus, so-called color shift (misregistration) occurs, i.e., the relative positions between the images formed by the image forming units do not match. Misregistration occurs due to installation errors of the components that constitute the image forming units, and due to changes in the relative positions of these components due to changes in environmental conditions such as temperature. Misregistration also occurs due to uneven rotation of the rotating driven components, changes in rotation speed, and the like. In addition, the color balance (so-called color tone) changes due to changes in the image density of various colors due to conditions such as the use environment and the number of printed sheets.

[0073] The second detection pattern is used for the sensor to complete misregistration detection, in which the sensor needs to detect the offset amount of other colors with respect to the reference color, which can be any color. In the embodiments of the present application, the reference color is taken as black.

[0074] The second detection pattern includes a full-color third sub-pattern 211, and a full-color fourth sub-pattern 212.

[0075] The third sub-pattern 211 and the fourth sub-pattern 212 can each include at least one set of detection patterns to detect the offset amount of C, M, Y with respect to K. For example, the third sub-pattern 211 includes a yellow color block 210Y, a magenta color block 210M, and a cyan color block 210C, and the fourth sub-pattern 212 includes a black color block 210K. Figure 3The third sub-pattern 211 is taken as an example, and includes a group of oblique lines of each color, and a group of horizontal lines of each color.

[0076] The first sensor 101 detects the third sub-pattern 211. The first sensor 101 includes a specular reflection detection channel and a diffuse reflection detection channel, and the first sensor detects the full-color third sub-pattern based on the specular reflection detection channel and the diffuse reflection detection channel to detect the color registration error.

[0077] The fourth sub-pattern 212 includes a pattern of non-black colors (C, M, Y), and a pattern in which one of the non-black colors is superimposed with black, which is superimposed with black in the embodiment of the present application, and is shown as superimposed with magenta M and black K. The second sensor 102 includes a diffuse reflection detection channel, and can detect the C, M, Y colors in the fourth sub-pattern 212. The second sensor 102 can also detect the pattern in which the magenta M and black K are superimposed, and regard it as black, so as to further detect the offset of C, M, Y relative to K color, thereby completing the color registration error detection.

[0078] Referring to Figure 4 In an embodiment of the present application, a correction control method is provided.

[0079] S41, a first detection pattern for density detection is formed on an image carrier of the image forming device, and the first detection pattern includes a first sub-pattern of black, and a second sub-pattern of non-black;

[0080] S42, a first sensor is controlled to detect the density of the first sub-pattern, and a second sensor is controlled to detect the density of the second sub-pattern;

[0081] S43, a second detection pattern for color registration error detection is formed on the image carrier, and the second detection pattern includes a third sub-pattern of full color, and a fourth sub-pattern of full color, and the third sub-pattern is different from the fourth sub-pattern;

[0082] S44, the first sensor is controlled to detect the color registration error of the third sub-pattern, and the second sensor is controlled to detect the color registration error of the fourth sub-pattern.

[0083] The correction control method provided in the embodiments of the present application forms a first detection pattern for concentration detection on an image carrier, the first detection pattern comprising a first sub-pattern of black color and a second sub-pattern of non-black color, controls the first sensor to perform concentration detection on the first sub-pattern, and controls the second sensor to perform concentration detection on the second sub-pattern, so as to complete the concentration detection. The present scheme also forms a second detection pattern for out-of-gamut detection on the image carrier, comprising a third sub-pattern and a fourth sub-pattern, controls the first sensor to perform out-of-gamut detection on the third sub-pattern, and controls the second sensor to perform out-of-gamut detection on the fourth sub-pattern, so as to simultaneously perform concentration correction and out-of-gamut detection, and reduce the time cost of correction. Meanwhile, the third sub-pattern is different from the fourth sub-pattern, and there is no need to set a specular reflection detection channel and a diffuse reflection detection channel on the first sensor and the second sensor, so as to reduce the use cost of the sensor.

[0084] In a more detailed embodiment of the present application, the above-mentioned correction control method is described.

[0085] The above-mentioned correction control method is applied to an image forming device.

[0086] Specifically,

[0087] The image forming device comprises an image carrier. In the embodiments of the present application, the image carrier can be but is not limited to an intermediate transfer belt 27. The intermediate transfer belt is a belt for transferring the supplied printing paper, and forms a detection pattern on the surface in a state that the printing paper has not received the transferred image. The image carrier can also be a medium such as paper directly.

[0088] The image forming device further comprises a pattern forming unit, which can comprise, for example, a photosensitive member 122 corresponding to each color, a charging member 123, a scanning unit 124, a developing unit, and the like, for forming the detection pattern on the intermediate belt. The pattern forming unit further comprises a necessary control unit for controlling the cooperation of each member. The pattern forming unit can also comprise a storage unit for storing the pre-set detection pattern.

[0089] Figure 3 The detection schematic diagram formed by the pattern forming unit in an embodiment of the present application on the intermediate transfer belt 27.

[0090] Figure 3 The arrow direction in the above-mentioned figure is the movement direction of the surface of the intermediate transfer belt 27. The first sensor 101 detects the detection pattern on the side of the movement direction of the intermediate transfer belt 27. The second sensor 102 detects the detection pattern on the other side of the movement direction of the intermediate transfer belt 27.

[0091] As Figure 3As shown, the pattern forming unit forms a first sub-pattern and a third sub-pattern on one side of the image carrier, and forms a second sub-pattern and a fourth sub-pattern on the other side of the image carrier.

[0092] Specifically, the first sub-pattern is a black pattern, for example, can be a black color block 210K, and the first sensor 101 can perform concentration detection on the black color block based on the specular reflection detection channel.

[0093] The second sub-pattern is a non-black pattern, including a yellow color block 210Y, a magenta color block 210M, and a cyan color block 210C, and the second sensor 102 can perform concentration detection on each non-black color block based on the diffuse reflection detection channel.

[0094] In the embodiments of the present application, the image forming apparatus has a plurality of image forming units, and forms a multi-color image by forming images of various colors using the image forming units and then transferring the images to an intermediate transfer member or recording material in an overlapping manner. In this type of image forming apparatus, so-called color shift (misregistration) occurs, i.e., the relative positions between the images formed by the image forming units do not match. Misregistration occurs due to installation errors of the components constituting the image forming units, and due to changes in the relative positions of these components due to changes in environmental conditions such as temperature. Misregistration also occurs due to uneven rotation of a rotating driven component, changes in rotation speed, and the like. In addition, color balance (so-called color tone) changes due to changes in the concentrations of images of various colors due to conditions such as the use environment and the number of printed sheets.

[0095] The second detection pattern is used for the sensor to perform misregistration detection, in which the sensor needs to detect the amount of shift of other colors with respect to a reference color, which can be any color. In the embodiments of the present application, the reference color is taken as black.

[0096] The second detection pattern includes a full-color third sub-pattern 211, and a full-color fourth sub-pattern 212.

[0097] The third sub-pattern 211 and the fourth sub-pattern 212 can each include at least one set of detection patterns to detect the amount of shift of C, M, and Y with respect to K. For example, the third sub-pattern 211 includes a set of diagonal lines of each color, and a set of horizontal lines of each color. Figure 3

[0098] The first sensor 101 detects the third sub-pattern 211. The first sensor 101 includes a specular reflection detection channel and a diffuse reflection detection channel, and the first sensor performs misregistration detection on the full-color third sub-pattern based on the specular reflection detection channel and the diffuse reflection detection channel.​

[0099] The fourth sub-pattern 212 includes patterns of non-black colors (C, M, and Y), as well as a superposition of one of these non-black colors and black. In this embodiment, this is a superposition of magenta (M) and black (K). The second sensor 102 includes a diffuse reflection detection channel that can detect the C, M, and Y colors in the fourth sub-pattern 212. The second sensor 102 can also detect the superposition of magenta (M) and black (K), treating it as black. This allows the second sensor 102 to further detect the offset of C, M, and Y relative to K, thereby performing color misregistration detection.

[0100] On the other hand, an embodiment of the present application provides a computer-readable storage medium, which includes a stored program, wherein when the program is run, the device where the storage medium is located is controlled to execute the above-mentioned correction control method.

[0101] On the other hand, an embodiment of the present application provides a computer device, Figure 5 This is a schematic diagram of a computer device provided in an embodiment of the present application. Figure 5 As shown, the computer device 500 of this embodiment includes: a processor 501, a memory 502, and a computer program 503 stored in the memory and executable by the processor 501. When the processor 501 executes the computer program 503, the correction control method of the embodiment is implemented. To avoid repetition, the details are not described here. Alternatively, when the computer program is executed by the processor 501, the functions of each model / unit in the distribution network device of the embodiment are implemented. To avoid repetition, the details are not described here.

[0102] The computer device 500 may be a desktop computer, a notebook computer, a PDA, a cloud server, an image forming device, or other computing device. The computer device may include, but is not limited to, a processor 501 and a memory 502. Those skilled in the art will appreciate that Figure 5 This is merely an example of the computer device 500 and does not constitute a limitation of the computer device 500 . The computer device 500 may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the computer device may also include input and output devices, network access devices, buses, etc.

[0103] The processor 501 can be a central processing unit (CPU), and can also be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0104] The memory 502 can be an internal storage unit of the computer device 500, for example, a hard disk or a memory of the computer device 500. The memory 502 can also be an external storage device of the computer device 500, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 502 can include both the internal storage unit and the external storage device of the computer device 500. The memory 502 is used to store computer programs and other programs and data required by the computer device. The memory 502 can also be used to temporarily store data that has been output or will be output.

[0105] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0106] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented by other means. For example, the above-described device embodiments are merely illustrative. For example, the division of the above-described units is merely a logical function division. In actual implementation, another division manner can be adopted. For example, a plurality of units or components can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the units or components shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0107] The integrated unit in the form of software function unit can be stored in a computer readable storage medium. The software function unit is stored in a storage medium, and includes a plurality of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute part of steps of the method according to the embodiments of the present application. The storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various storage medium capable of storing program codes.

[0108] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An image forming apparatus, characterized in that: include: image carrier; a pattern forming unit, configured to form a first detection pattern for density detection on the image carrier, wherein the first detection pattern includes a first black sub-pattern and a second non-black sub-pattern; a first sensor, configured to detect the density of the first sub-pattern; a second sensor, configured to detect the density of the second sub-pattern; The pattern forming unit is further configured to form a second detection pattern for color misregistration detection on the image carrier, wherein the second detection pattern includes a full-color third sub-pattern and a full-color fourth sub-pattern, and the third sub-pattern is different from the fourth sub-pattern; The first sensor is further configured to perform color misregistration detection on the third sub-pattern; The second sensor is further configured to perform color misregistration detection on the fourth sub-pattern; The first sensor includes a mirror reflection detection channel, which is used to detect the density of the first black sub-pattern based on the mirror reflection detection channel; The first sensor further includes a diffuse reflection detection channel for performing color misregistration detection on the full-color third sub-pattern based on the specular reflection detection channel and the diffuse reflection detection channel; The second sensor includes a diffuse reflection detection channel, configured to detect the density of the non-black second sub-pattern based on the diffuse reflection detection channel; The second sensor is further configured to perform color misregistration detection on non-black color patterns and a pattern in which one non-black color and black are superimposed in the fourth sub-pattern based on the diffuse reflection detection channel.

2. The image forming apparatus according to claim 1, wherein The pattern forming unit is configured to form the first sub-pattern and the third sub-pattern on one side of the image carrier, and to form the second sub-pattern and the fourth sub-pattern on the other side of the image carrier.

3. The image forming apparatus according to claim 1, wherein The fourth sub-pattern includes a pattern of a non-black color and a pattern in which one non-black color and black are superimposed.

4. A correction control method, applied to an image forming apparatus, characterized in that: The method comprises: forming a first detection pattern for density detection on an image carrier of the image forming device, wherein the first detection pattern includes a first black sub-pattern and a second non-black sub-pattern; controlling the first sensor to detect the density of the first sub-pattern, and controlling the second sensor to detect the density of the second sub-pattern; forming a second detection pattern for color misregistration detection on the image carrier, wherein the second detection pattern includes a full-color third sub-pattern and a full-color fourth sub-pattern, and the third sub-pattern is different from the fourth sub-pattern; controlling the first sensor to perform color misregistration detection on the third sub-pattern, and controlling the second sensor to perform color misregistration detection on the fourth sub-pattern; The first sensor includes a mirror reflection detection channel, and performs density detection on the first black sub-pattern based on the mirror reflection detection channel; the first sensor also includes a diffuse reflection detection channel, and performs color misregistration detection on the third full-color sub-pattern based on the mirror reflection detection channel and the diffuse reflection detection channel; The second sensor includes a diffuse reflection detection channel, and performs concentration detection on the non-black second sub-pattern based on the diffuse reflection detection channel; the second sensor also performs color misregistration detection on the non-black color pattern in the fourth sub-pattern, and the pattern in which one non-black color is superimposed with black, based on the diffuse reflection detection channel.

5. The method according to claim 4, characterized in that include: The first sub-pattern and the third sub-pattern are formed on one side of the image carrier, and the second sub-pattern and the fourth sub-pattern are formed on the other side of the image carrier.

6. The method according to claim 4, characterized in that The fourth sub-pattern includes a pattern of a non-black color and a pattern in which one non-black color and black are superimposed.

7. A computer-readable storage medium, characterized in that The storage medium includes a stored program, and when the program is executed, the device where the storage medium is located is controlled to execute the correction control method according to any one of claims 4 to 6.

Images