Image forming apparatus, phase registration method of photosensitive member

Abstract

The embodiment of the present application provides a kind of image forming device, the phase registration method of photosensitive component, image forming device includes: first motor is configured to rotate first photosensitive component;Second motor is configured to rotate second photosensitive component;First phase sensor is configured to detect the first rotation phase of first photosensitive component;Second phase sensor is configured to detect the second rotation phase of second photosensitive component;Control unit is configured to after completing at least one page image forming operation, at least one motor in first motor and second motor receives phase registration instruction, according to the rotation phase of the photosensitive component corresponding to the motor of receiving phase registration instruction, the phase registration of first photosensitive component and second photosensitive component is carried out, wherein, phase registration instruction is used to indicate that first photosensitive component and second photosensitive component need to carry out phase registration, so that the output time of the first page or multi-page operation is not increased by executing phase registration, improve user experience.

Description

Technical Field

[0001] This application relates to the field of image forming technology, and more specifically to an image forming apparatus and a phase registration method for a photosensitive component. Background Technology

[0002] An image forming apparatus is a device that forms an image on a recording medium using imaging principles. Examples include printers, copiers, fax machines, multifunction image processing and copying devices, electrostatic printing devices, and any other similar devices. Based on color, image forming apparatuses can be further divided into color image forming apparatuses and black-and-white image forming apparatuses. Color image forming apparatuses typically include multiple photosensitive elements, each corresponding to a different color (e.g., yellow (Y), magenta (M), cyan (C), and black (K)). Different colored toner images are formed on the surfaces of the photosensitive elements of different colors, and then sequentially transferred onto a transfer belt. The overlapping of these toner images forms a color image.

[0003] In image formation, if the rotation phase of the gears on the same point in the image differs during development and transfer through different photosensitive drums, the instantaneous velocity of that point in each drum will vary. This can lead to discrepancies in the overlap of toner images (i.e., color misalignment), resulting in a decrease in image quality. Therefore, it is necessary to control the rotation phase of the photosensitive components for different colors to prevent color misalignment.

[0004] In existing technologies, phase registration is typically performed on photosensitive components of different colors before image formation. However, performing phase registration before image formation increases the output time for the first page or multiple pages of image formation, thus affecting the user experience. Summary of the Invention

[0005] In view of this, this application provides an image forming apparatus, a phase registration method for a photosensitive component, and a storage medium to solve the problem in the prior art that performing phase registration before performing image forming operations increases the output time of the first page or multiple pages of image forming operations, thus affecting the user experience.

[0006] In a first aspect, embodiments of this application provide an image forming apparatus, comprising:

[0007] The first motor is configured to rotate the first photosensitive element;

[0008] The second motor is configured to rotate the second photosensitive element;

[0009] A first phase sensor is configured to detect a first rotational phase of a first photosensitive element;

[0010] The second phase sensor is configured to detect the second rotational phase of the second photosensitive element;

[0011] The control unit is configured as follows:

[0012] After completing the image formation operation for at least one page, at least one of the first motor and the second motor receives a phase registration command and performs phase registration on the first photosensitive component and the second photosensitive component according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. The phase registration command is used to indicate that the first photosensitive component and the second photosensitive component need to be phase registered.

[0013] In one possible implementation, the control unit is specifically configured to: when the first phase sensor detects a preset first phase signal, control the first motor to stop rotating after a first fixed time delay; and / or

[0014] When the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a second fixed time delay;

[0015] Wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

[0016] In one possible implementation, the control unit is specifically configured to: when the first phase sensor detects a preset first phase signal, control the first motor to stop rotating after a first variable time delay; and / or

[0017] When the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a second variable time delay;

[0018] Wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

[0019] In one possible implementation, the control unit is specifically configured as follows:

[0020] After completing the previous phase registration operation for the first and second photosensitive components, when at least one of the first and second motors receives the phase registration command, and a first preset condition is met, phase registration is performed on the first and second photosensitive components using a new first variable time and / or a new second variable time, wherein the new first variable time is different from the first variable time corresponding to the previous phase registration operation, and the new second variable time is different from the second variable time corresponding to the previous phase registration operation; or

[0021] The control unit is specifically configured to: after completing the previous phase registration operation for the first photosensitive component and the second photosensitive component, when at least one of the first motor and the second motor receives the phase registration command, and when the second preset condition is met, to perform phase registration on the first photosensitive component and the second photosensitive component using the first variable time and / or the second variable time corresponding to the previous phase registration operation.

[0022] In one possible implementation, when the printing speed of the image forming apparatus is a first printing speed, the control unit is specifically configured to perform phase registration operations on the first photosensitive element and the second photosensitive element using a third sub-variable time; when the printing speed of the image forming apparatus is a second printing speed, the control unit is specifically configured to perform phase registration operations on the first photosensitive element and the second photosensitive element using a fourth sub-variable time, wherein when the first printing speed is greater than the second printing speed, the third sub-variable time is less than the fourth sub-variable time.

[0023] In one possible implementation, the control unit is specifically configured to: when at least one of the first motor and the second motor receives the phase registration command, and when the initially determined first variable time exceeds a first preset value or the initially determined second variable time exceeds a second preset value, perform phase registration operation on the first photosensitive component and the second photosensitive component using a new first variable time and / or a new second variable time, wherein the new first variable time does not exceed the first preset value and the new second variable time does not exceed the second preset value.

[0024] In one possible implementation, the first preset condition includes at least one of the following: the image forming apparatus has finished preheating, the color printing job has been completed, and the color correction has been completed. The second preset condition includes at least one of the following: the black and white printing job has been completed, the density correction corresponding to the black and white printing operation has been completed, and the black imaging component has been preheated separately.

[0025] In one possible implementation, the control unit is specifically configured to: determine the phase difference between the first photosensitive element and the second photosensitive element based on the first rotation phase and the second rotation phase during or after performing at least one page image formation operation in a print job.

[0026] Based on the phase difference between the first photosensitive element and the second photosensitive element, the rotational speed of the first motor and / or the second motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0027] In one possible implementation, the control unit is specifically configured as follows:

[0028] The first motor is controlled to maintain a reference speed, and the speed of the second motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0029] or,

[0030] The second motor is controlled to maintain a reference speed, and the speed of the first motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0031] or,

[0032] Simultaneously adjust the rotation speeds of the first motor and the second motor so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0033] In one possible implementation, the first photosensitive element includes a black photosensitive element, and the second photosensitive element includes at least one of a yellow photosensitive element, a magenta photosensitive element, and a cyan photosensitive element; or

[0034] The first photosensitive drum is one of a yellow photosensitive component, a magenta photosensitive component, and a cyan photosensitive component, and the second photosensitive component is the other of a yellow photosensitive component, a magenta photosensitive component, and a cyan photosensitive component.

[0035] Secondly, embodiments of this application provide a phase registration method for a photosensitive component, applied to an image forming apparatus, the image forming apparatus comprising: a first motor configured to rotate a first photosensitive component; a second motor configured to rotate a second photosensitive component; a first phase sensor configured to detect a first rotation phase of the first photosensitive component; and a second phase sensor configured to detect a second rotation phase of the second photosensitive component; the method comprising:

[0036] After completing the image formation operation for at least one page, at least one of the first motor and the second motor receives a phase registration command and performs phase registration on the first photosensitive component and the second photosensitive component according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. The phase registration command is used to indicate that the first photosensitive component and the second photosensitive component need to be phase registered.

[0037] In one possible implementation, after completing at least one page of image formation, upon receiving a phase registration command, the first and second photosensitive components are phase-registered according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. This specifically includes:

[0038] When the first phase sensor detects a preset first phase signal, the first motor is controlled to stop rotating after a first fixed time delay; and / or

[0039] When the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a second fixed time delay;

[0040] Wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

[0041] In one possible implementation, after completing at least one page of image formation, upon receiving a phase registration command, the first and second photosensitive components are phase-registered according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. This specifically includes:

[0042] When the first phase sensor detects a preset first phase signal, the first motor is controlled to stop rotating after a first variable time delay; and / or

[0043] When the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a second variable time delay;

[0044] Wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

[0045] In one possible implementation, the phase registration method further includes:

[0046] After completing the previous phase registration operation for the first and second photosensitive components, when at least one of the first and second motors receives the phase registration command, and a first preset condition is met, phase registration is performed on the first and second photosensitive components using a new first variable time and / or a new second variable time, wherein the new first variable time is different from the first variable time corresponding to the previous phase registration operation, and the new second variable time is different from the second variable time corresponding to the previous phase registration operation; or

[0047] After completing the previous phase registration operation for the first photosensitive element and the second photosensitive element, when at least one of the first motor and the second motor receives the phase registration command, and when the second preset condition is met, the first variable time and / or the second variable time corresponding to the previous phase registration operation are used to perform phase registration on the first photosensitive element and the second photosensitive element.

[0048] In one possible implementation, when the printing speed of the image forming apparatus is a first printing speed, a third sub-variable time is used to perform phase registration operations on the first photosensitive element and the second photosensitive element; when the printing speed of the image forming apparatus is a second printing speed, a fourth sub-variable time is used to perform phase registration operations on the first photosensitive element and the second photosensitive element, wherein when the first printing speed is greater than the second printing speed, the third sub-variable time is less than the fourth sub-variable time.

[0049] In one possible implementation, the phase registration method further includes:

[0050] When at least one of the first motor and the second motor receives the phase registration command, if the initially determined first variable time exceeds the first preset value or the initially determined second variable time exceeds the second preset value, a phase registration operation is performed on the first photosensitive component and the second photosensitive component using a new first variable time and / or a new second variable time, wherein the new first variable time does not exceed the first preset value and the new second variable time does not exceed the second preset value.

[0051] In one possible implementation, after completing at least one page of image formation, upon receiving a phase registration command, the first and second photosensitive components are phase-registered according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. This specifically includes:

[0052] During or after the formation of at least one page of an image in a print job, the phase difference between the first photosensitive element and the second photosensitive element is determined based on the first rotation phase and the second rotation phase.

[0053] Based on the phase difference between the first photosensitive element and the second photosensitive element, the rotational speed of the first motor and / or the second motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0054] In one possible implementation, adjusting the rotational speed of the first motor and / or the second motor based on the phase difference between the first photosensitive component and the second photosensitive component, such that the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold, specifically includes:

[0055] The first motor is controlled to maintain a reference speed, and the speed of the second motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0056] or,

[0057] The second motor is controlled to maintain a reference speed, and the speed of the first motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0058] or,

[0059] Simultaneously adjust the rotation speeds of the first motor and the second motor so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0060] Thirdly, embodiments of this application provide a phase registration method for a photosensitive component, applied to an image forming apparatus, the image forming apparatus comprising: a first motor configured to rotate a first photosensitive component; a second motor configured to rotate a second photosensitive component; a first phase sensor configured to detect a first rotation phase of the first photosensitive component; and a second phase sensor configured to detect a second rotation phase of the second photosensitive component; the method comprising:

[0061] When the first phase sensor detects a preset first phase signal, the first motor is controlled to stop rotating after a first variable time delay; and / or

[0062] When the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a second variable time delay;

[0063] Wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

[0064] Fourthly, embodiments of this application provide an image forming apparatus, comprising:

[0065] The first motor is configured to rotate the first photosensitive element;

[0066] The second motor is configured to rotate the second photosensitive element;

[0067] A first phase sensor is configured to detect a first rotational phase of a first photosensitive element;

[0068] The second phase sensor is configured to detect the second rotational phase of the second photosensitive element;

[0069] The control unit is configured to control the first motor to stop after a first variable time when the first phase sensor detects a preset first phase signal; and to control the second motor to stop after a second variable time when the second phase sensor detects a preset second phase signal; wherein, after the first motor and the second motor stop, the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

[0070] Fifthly, embodiments of this application provide an image forming apparatus, comprising:

[0071] The first motor is configured to rotate the first photosensitive element;

[0072] The second motor is configured to rotate the second photosensitive element;

[0073] The third motor is configured to rotate the third photosensitive element;

[0074] The fourth motor is configured to rotate the fourth photosensitive element;

[0075] A first phase sensor is configured to detect a first rotational phase of a first photosensitive element;

[0076] The second phase sensor is configured to detect the second rotational phase of the second photosensitive element;

[0077] The third phase sensor is configured to detect the third rotational phase of the third photosensitive element;

[0078] The fourth phase sensor is configured to detect the fourth rotational phase of the fourth photosensitive element;

[0079] The control unit is configured to, after completing at least one page of image formation, perform phase registration on the first, second, third, and fourth photosensitive components based on the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command, after receiving a phase registration command from at least one of the first, second, third, and fourth photosensitive components. The phase registration command is used to indicate that the first, second, third, and fourth photosensitive components need to be phase registered.

[0080] Sixthly, embodiments of this application provide an image forming apparatus, comprising:

[0081] An image forming apparatus, characterized in that it comprises:

[0082] The first motor is configured to rotate the first photosensitive element;

[0083] The second motor is configured to rotate the second photosensitive element;

[0084] The third motor is configured to rotate the third photosensitive element;

[0085] The fourth motor is configured to rotate the fourth photosensitive element;

[0086] A first phase sensor is configured to detect a first rotational phase of a first photosensitive element;

[0087] The second phase sensor is configured to detect the second rotational phase of the second photosensitive element;

[0088] The third phase sensor is configured to detect the third rotational phase of the third photosensitive element;

[0089] The fourth phase sensor is configured to detect the fourth rotational phase of the fourth photosensitive element;

[0090] The control unit is configured to, when the first phase sensor detects a preset first phase signal, control the first motor to stop after a first variable time delay; when the second phase sensor detects a preset second phase signal, control the second motor to stop after a second variable time delay; when the third phase sensor detects a preset third phase signal, control the third motor to stop after a third variable time delay; and when the fourth phase sensor detects a preset fourth phase signal, control the fourth motor to stop after a fourth variable time delay; wherein, after the first motor, second motor, third motor, and fourth motor stop, the phase difference between the first photosensitive element, second photosensitive element, third photosensitive element, and fourth photosensitive element is less than or equal to a preset phase difference threshold.

[0091] In a seventh aspect, embodiments of this application provide a phase registration method for a photosensitive component, applied to an image forming apparatus, the image forming apparatus comprising: a first motor configured to rotate a first photosensitive component; and a second motor configured to rotate a second photosensitive component;

[0092] A third motor is configured to rotate a third photosensitive element; a fourth motor is configured to rotate a fourth photosensitive element; a first phase sensor is configured to detect a first rotation phase of the first photosensitive element; a second phase sensor is configured to detect a second rotation phase of the second photosensitive element; a third phase sensor is configured to detect a third rotation phase of the third photosensitive element; and a fourth phase sensor is configured to detect a fourth rotation phase of the fourth photosensitive element; the method includes:

[0093] After completing the image formation operation for at least one page, at least one of the first motor, the second motor, the third motor, and the fourth motor receives a phase registration command and performs phase registration on the first photosensitive component, the second photosensitive component, the third photosensitive component, and the fourth photosensitive component according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. The phase registration command is used to indicate that the first photosensitive component, the second photosensitive component, the third photosensitive component, and the fourth photosensitive component need to be phase registered.

[0094] Eighthly, embodiments of this application provide a phase registration method for a photosensitive component, characterized in that it is applied to an image forming apparatus, the image forming apparatus comprising: a first motor configured to rotate a first photosensitive component; and a second motor configured to rotate a second photosensitive component;

[0095] A third motor is configured to rotate a third photosensitive element; a fourth motor is configured to rotate a fourth photosensitive element; a first phase sensor is configured to detect a first rotation phase of the first photosensitive element; a second phase sensor is configured to detect a second rotation phase of the second photosensitive element; a third phase sensor is configured to detect a third rotation phase of the third photosensitive element; and a fourth phase sensor is configured to detect a fourth rotation phase of the fourth photosensitive element; the method includes:

[0096] When the first phase sensor detects a preset first phase signal, the first motor is controlled to stop after a first variable time delay; when the second phase sensor detects a preset second phase signal, the second motor is controlled to stop after a second variable time delay; when the third phase sensor detects a preset third phase signal, the third motor is controlled to stop after a third variable time delay; when the fourth phase sensor detects a preset fourth phase signal, the fourth motor is controlled to stop after a fourth variable time delay; wherein, after the first motor, second motor, third motor, and fourth motor stop, the phase difference between the first photosensitive component, second photosensitive component, third photosensitive component, and fourth photosensitive component is less than or equal to a preset phase difference threshold.

[0097] Ninthly, embodiments of this application provide a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method described in any one of the fifth to eighth aspects.

[0098] By employing the technical solution provided by this invention, one of the following beneficial effects can be obtained:

[0099] 1. After completing at least one page of image formation, at least one of the first and second motors receives a phase registration command. Based on the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command, the first and second photosensitive components are phase registered. Phase registration can be performed after the first page or multiple pages of image formation is completed. This avoids the situation in the prior art where performing phase registration before performing image formation increases the output time of the first page image formation and affects the user experience. The present invention can reduce the output time of the first page or multiple pages by performing phase registration of the two motors after completing at least one page of image formation.

[0100] 2. In a preferred embodiment, the first motor and / or the second motor are controlled to stop rotating after a first fixed time and a second fixed time, respectively, to perform phase registration of the two photosensitive components. Phase registration can be performed according to the phase registration instruction after the printing job is completed, without occupying the time before the image forming job, which can reduce the output time of the first page or multiple pages.

[0101] 3. Control the first motor and / or the second motor to stop rotating after a first variable time and a second variable time, respectively, to perform phase registration of the two photosensitive components. This ensures that the first motor and the second motor stop at different phases each time they perform phase matching, so that the contact position between the photosensitive component and the transfer belt is different on the photosensitive component each time it stops. This reduces the problem of dirt and damage to the photosensitive component caused by the transfer roller pressing down and lifting up once at the start and end of printing, and the transfer roller limit block hitting the same position on the photosensitive component every time. Attached Figure Description

[0102] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0103] Figure 1 This is a schematic diagram of the structure of an image forming apparatus provided in an embodiment of this application;

[0104] Figure 2 A schematic diagram of a driving system for a photosensitive drum provided in an embodiment of this application;

[0105] Figure 3 A phase diagram of a photosensitive component provided in an embodiment of this application;

[0106] Figure 4 A structural block diagram of an image forming apparatus provided in an embodiment of this application;

[0107] Figure 5 A schematic diagram of a driving system for a first photosensitive component provided in an embodiment of this application;

[0108] Figure 6 A schematic diagram of a driving system for a second photosensitive component provided in an embodiment of this application;

[0109] Figure 7 A schematic diagram of a phase detection principle provided in an embodiment of this application;

[0110] Figure 8 A phase-matching timing diagram provided in an embodiment of this application;

[0111] Figure 9 Another phase-matching timing diagram provided in this application embodiment;

[0112] Figure 10 A phase diagram of another photosensitive component provided in an embodiment of this application;

[0113] Figure 11 Another phase-matching timing diagram provided in this application embodiment;

[0114] Figure 12 Another phase-matching timing diagram provided in this application embodiment;

[0115] Figure 13 Another phase-matching timing diagram provided in this application embodiment;

[0116] Figure 14 A structural block diagram of another image forming apparatus provided in an embodiment of this application;

[0117] Figure 15 Another phase-matching timing diagram provided in this application embodiment;

[0118] Figure 16 A schematic flowchart of a phase registration method for a photosensitive component provided in an embodiment of this application;

[0119] Figure 17 This is a schematic flowchart of another phase registration method for a photosensitive component provided in an embodiment of this application. Detailed Implementation

[0120] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0121] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0122] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0123] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0124] See Figure 1 This is a schematic diagram of the structure of an image forming apparatus provided in an embodiment of this application. Figure 1 The image primarily shows the portion where the toner image is transferred onto the recording medium. This image forming apparatus is a color image forming apparatus, comprising four image forming units for forming yellow toner images, magenta toner images, cyan toner images, and black toner images.

[0125] Each image forming unit includes one of the photosensitive drums 101a to 101d, which serve as rotating components. The suffixes "a" to "d" in the reference numerals 101a to 101d for the photosensitive drums respectively represent "yellow," "magenta," "cyan," and "black." That is, photosensitive drum 101a is the photosensitive component for forming a yellow toner image, photosensitive drum 101b is the photosensitive component for forming a magenta toner image, photosensitive drum 101c is the photosensitive component for forming a cyan toner image, and photosensitive drum 101d is the photosensitive component for forming a black toner image. It should be noted that photosensitive drums 101a to 101c may also be collectively referred to as "color photosensitive drums." The definitions of the suffixes "a" to "d" also apply to laser scanners 109a to 109d.

[0126] Photosensitive drum 101d is driven by a first motor 111 for a monochrome photosensitive drum via gears; photosensitive drums 101a to 101c are driven by a second motor 112 for a color photosensitive drum via gears. The first motor 111 and the second motor 112 can be DC brushless motors. Photosensitive drums 101a to 101c are assembled such that the eccentric components of the rotation axes of the photosensitive drums and the gears cancel each other out, and the periods of peripheral velocity changes caused by the eccentricity of the photosensitive drums 101a to 101c have the same phase. Since photosensitive drums 101a to 101c are driven by a single second motor 112, they rotate in the same phase. Therefore, photosensitive drums 101a to 101c are rotated while maintaining their same phase. The rotational phase of photosensitive drums 101a to 101c is detected by a second phase sensor 122; the rotational phase of photosensitive drum 101d is detected by a first phase sensor 121. The configuration of the first phase sensor 121 and the second phase sensor 122 is described in more detail below. Understandably, the first motor and the second motor in the embodiments of this application may include one or more motors for driving the photosensitive drums 101a to 101d. That is, each photosensitive drum may be provided with a motor for driving its rotation and a corresponding gear. The second phase sensor may include phase sensors for detecting at least one phase of the photosensitive drums 101a to 101d. That is, each of the photosensitive drums 101a to 101d may be provided with an independent phase sensor to detect the rotation phase. For example, if the first motor is used to drive the monochrome photosensitive drum 101d via gears, then the second motor may refer to a motor that drives at least one of the color photosensitive drums 101a to 101c. That is, the second motor may include at least one motor for driving at least one of the color photosensitive drums 101a to 101c respectively. The first phase sensor is used to detect the rotation phase of the monochrome photosensitive drum, and the second phase sensor may be used to detect the rotation phase of at least one of the color photosensitive drums 101a to 101c. That is, the second phase sensor may include at least one phase sensor for detecting the rotation phase of at least one of the color photosensitive drums 101a to 101c.

[0127] Each of the developing units (not shown in the figure, one developing unit for each photosensitive drum) deposits toner (developer) onto a latent image formed on one of the photosensitive drums 101a to 101d, forming a toner image. Thus, the latent image is visualized. The latent image on each of the photosensitive drums 101a to 101d is formed by exposure performed based on an image signal by one of the laser scanners 109a to 109d. The toner image, as a visible image, formed on the photosensitive drums 101a to 101d is sequentially transferred onto a transfer belt 104 rotated by a drive roller 103.

[0128] The toner image transferred onto the transfer belt 104 is simultaneously transferred onto the recording medium by the transfer roller 105. The recording medium with the toner image transferred is then conveyed to the fuser unit 106, which includes a fuser roller driven by a fuser drive motor. In the fuser unit 106, the toner image is fixed onto the recording medium by heating.

[0129] In this embodiment, upon receiving an image forming operation instruction, the image forming apparatus sends image signals of each color to laser scanners 109a to 109d, and forms latent images on photosensitive drums 101a to 101d. The four-color latent images formed on photosensitive drums 101a to 101d are developed by developing units, forming four-color toner images on photosensitive drums 101a to 101d. The four-color toner images are transferred onto a transfer belt 104 driven to rotate by drive roller 103, thereby overlapping each other.

[0130] Subsequently, the recording medium is conveyed from the paper tray 107 in the direction indicated by arrow P. The toner image formed on the transfer belt 104 is transferred onto the recording medium via the transfer roller 105. Then, under the action of heat and pressure, the toner image transferred onto the recording medium is fixed to the recording medium by the fixing unit 106. Afterward, the recording medium is discharged onto the output tray 108.

[0131] See Figure 2 This is a schematic diagram of a driving system for a photosensitive drum provided in an embodiment of this application. Figure 2 As shown, motor 201 is connected to photosensitive drum 203 via gear 202. When motor 201 rotates, it can drive photosensitive drum 203 to rotate at a corresponding speed via gear 202. It should be noted that... Figure 2 This is merely an illustrative description of the driving system for the photosensitive drum in this application embodiment. This application embodiment does not impose specific limitations on its specific driving form (e.g., gear type, gear arrangement, etc.).

[0132] In practical applications, due to shape errors in gears, there are periodic fluctuations in their peripheral linear velocity. These fluctuations differ between gears produced using different molds. Therefore, the same image forming apparatus requires gears from the same mold and cavity to ensure the production of photosensitive drums of different colors (e.g., ...). Figure 1 The photosensitive drums 101a to 101d have the same oscillation period. Nevertheless, in image forming operations, if the rotation phase of the gears is different when the same point on the image passes through different photosensitive drums for development and transfer, it will result in different instantaneous velocities corresponding to that point in different photosensitive drums.

[0133] See Figure 3 This is a phase diagram of a photosensitive component provided in an embodiment of this application. Figure 3As shown, the phase inconsistency of the four color photosensitive components (photosensitive drums) results in different instantaneous velocities for the same point in different photosensitive drums, leading to differences in the overlap of toner images of different colors (i.e., color misalignment) and a decrease in image quality. Therefore, it is necessary to control the rotation phase of the photosensitive drums of different colors to prevent color misalignment. It should be noted that the rotation phase of the gear matches the rotation phase of the gear-driven photosensitive drum; therefore, the rotation phase of the gear can also be referred to as the rotation phase of the photosensitive drum. Accordingly, phase registration of the gear's rotation phase is equivalent to phase registration of the photosensitive drum's rotation phase.

[0134] In existing technologies, phase registration is typically performed on photosensitive drums of different colors before image formation. However, performing phase registration before image formation increases the output time of the homepage image formation job, affecting the user experience.

[0135] To address this issue, this application provides an image forming apparatus, a phase registration method for photosensitive components, and a storage medium. After completing at least one page of image forming work, at least one of the first and second motors receives a phase registration command. Phase registration is then performed on the first and second photosensitive components based on the rotation phase of the photosensitive component corresponding to the motor receiving the command. This allows phase registration to be performed after completing the first page or multiple pages of image forming work, avoiding the situation in the prior art where performing phase registration before image forming increases the output time of the first page image forming work, thus affecting user experience. This application reduces the output time of the first page or multiple pages by performing phase registration of the two motors after completing at least one page of image forming work. A detailed description is provided below with reference to the accompanying drawings. See also... Figure 4 This is a structural block diagram of an image forming apparatus provided in an embodiment of this application. Figure 4 As shown, the image forming apparatus mainly includes the following functional units.

[0136] The first motor is configured to rotate the first photosensitive element.

[0137] See Figure 5 This is a schematic diagram of a driving system for a first photosensitive component provided in an embodiment of this application. Figure 5As shown, the drive system includes a first motor 111 and a first gear 502, which are coupled together. The first motor 111 can drive the first gear 502 to rotate, thereby driving the first photosensitive component to rotate. In a specific implementation, the first photosensitive component can be a black photosensitive component, i.e., a photosensitive component used to form a black toner image. The first photosensitive component can also be at least one of a yellow photosensitive component, a magenta photosensitive component, and a cyan photosensitive component. Specifically, the yellow photosensitive component is used to form a yellow toner image, the magenta photosensitive component is used to form a magenta toner image, and the cyan photosensitive component is used to form a cyan toner image.

[0138] It should be noted that the photosensitive component involved in the embodiments of this application may also be referred to as a "photosensitive drum" or "toner drum", etc., and the embodiments of this application do not impose specific limitations on it.

[0139] The second motor is configured to rotate the second photosensitive element.

[0140] In one possible implementation, the second photosensitive component includes at least one of a yellow photosensitive component, a magenta photosensitive component, and a cyan photosensitive component, wherein the yellow photosensitive component is a photosensitive component for forming a yellow toner image, the magenta photosensitive component is a photosensitive component for forming a magenta toner image, and the cyan photosensitive component is a photosensitive component for forming a cyan toner image.

[0141] When the first photosensitive element is one of a yellow photosensitive element, a magenta photosensitive element, and a cyan photosensitive element, and the second photosensitive element is another of a yellow photosensitive element, a magenta photosensitive element, and a cyan photosensitive element, for example, if the first photosensitive element is a yellow photosensitive element, then the second photosensitive element can be any one of a magenta photosensitive element and a cyan photosensitive element, for example, if the second photosensitive element is a magenta photosensitive element.

[0142] The phase registration referred to below can be registration of the black photosensitive component with at least one of the yellow, magenta, and cyan photosensitive components, or registration of one of the yellow, magenta, and cyan photosensitive components with another of the yellow, magenta, and cyan photosensitive components.

[0143] After completing at least one page of image formation, upon receiving a phase registration command, at least one of the first and second motors performs phase registration on the first and second photosensitive components based on the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. This includes at least one of the following:

[0144] 1. When performing black and white printing, typically only the black (K) imaging unit is used, while the yellow (Y), magenta (M), and cyan (C) imaging units are not required. Therefore, only the black imaging unit needs to be registered; the yellow, magenta, and cyan imaging units do not need to be activated. When registration is required, the motor driving the black photosensitive unit, such as the first motor, receives a phase registration command. After receiving the command, it needs to detect the rotation phase of the current black photosensitive unit and control the motor driving it to register with the yellow, magenta, and cyan photosensitive units based on the detected rotation phase. In this case, it is not necessary to activate the motors driving the yellow, magenta, and cyan photosensitive units (e.g., the second motor). The registration method can be found in the detailed description below.

[0145] 2. In special printers, such as red-black printers or other printers that can use yellow, magenta, and cyan photosensitive units for imaging independently, red-black printers typically only need to print red and black. At least one of the yellow, magenta, and cyan photosensitive units can be controlled to rotate for printing. Therefore, when printing, at least two of the yellow, magenta, and cyan photosensitive units need to be registered independently, such as registering the yellow photosensitive unit with the magenta photosensitive unit or the yellow photosensitive unit with the cyan photosensitive unit. When performing color printing, only the yellow, magenta, and cyan photosensitive units can be activated, while the black photosensitive unit remains off. Therefore, after receiving the registration command, the motors driving the yellow, magenta, and cyan photosensitive units detect the current rotation phase of these units and control them to register with the black photosensitive unit based on the detected rotation phase. In this case, it is not necessary to activate the motor driving the black photosensitive unit. The registration method can be found in the detailed description below.

[0146] 3. When performing color printing that requires four colors of toner, black (K), yellow (Y), magenta (M), and cyan (C) imaging components are typically used. Therefore, it is necessary to register the first and second motors that control the black (K) imaging component and the yellow (Y), magenta (M), and cyan (C) photosensitive components (or multiple motors can be used to control the four photosensitive components, for example, one motor for each of CMY colors and one motor for K). Therefore, after receiving the phase registration command, the first and second motors need to detect the rotation phase of the current black, yellow, magenta, and cyan photosensitive components, and control the motors driving the yellow, magenta, and cyan photosensitive components to register with the motor driving the black photosensitive component based on the detected rotation phase.

[0147] Therefore, in the above implementation, one of the first motors and the second motor may register with the other motor that has not received a registration instruction after receiving the registration instruction, or both motors may detect the rotation phase of the corresponding photosensitive component and perform registration after receiving the registration instruction. This application does not limit this.

[0148] See Figure 6 This is a schematic diagram of a driving system for a second photosensitive component provided in an embodiment of this application. Figure 6 As shown, the drive system includes a second motor 112 and second gears 602a to 602c. Second gear 602a drives the yellow photosensitive component to rotate, second gear 602b drives the magenta photosensitive component to rotate, and second gear 602c drives the cyan photosensitive component to rotate. That is, the second motor 112 simultaneously drives the rotation of three photosensitive components. Understandably, the second motor also includes multiple gears for driving the rotation of the yellow, magenta, and cyan photosensitive drums, respectively. Each photosensitive component has a corresponding drive system for driving that specific component. Alternatively, the system may include at least one of the multiple gears for driving the rotation of the yellow, magenta, and cyan photosensitive drums, respectively. This application does not limit this.

[0149] In specific implementation, the second gears 602a to 602c are installed in phase-matched positions during installation, and are driven by the same motor. Therefore, the phases of the second gears 602a to 602c are always registered, and correspondingly, the phases of the yellow, magenta, and cyan photosensitive components are always registered. For example, in Figure 3In this setup, the yellow, magenta, and cyan photosensitive drums have the same phase; the black photosensitive drum has a different phase than the other photosensitive drums. Therefore, in subsequent phase configuration steps, it is only necessary to register the black photosensitive component with any one of the yellow, magenta, or cyan photosensitive components. For example, the black photosensitive component is registered with the yellow photosensitive component.

[0150] It should be pointed out that, Figure 5 and Figure 6 This is merely an illustrative example of an embodiment of this application and should not be construed as limiting the scope of protection of this application. For example, in some possible implementations, the second photosensitive element may contain only one photosensitive element; or, the first photosensitive element may contain multiple photosensitive elements, driven by a first motor; or, both the first and second photosensitive elements may contain multiple photosensitive elements, with the first and second motors each driving multiple photosensitive elements. A first phase sensor is configured to detect the first rotational phase of the first photosensitive element.

[0151] See Figure 7 This is a schematic diagram illustrating a phase detection principle provided in an embodiment of this application. Figure 7 As shown, a first phase sensor 121 and a first light-shielding strip 504 are provided on the first gear 502. The first phase sensor 121 has a transmitter and a receiver. As the first gear 502 rotates, the first light-shielding strip 504 can move between the transmitter and the receiver. When the first light-shielding strip 504 is between the transmitter and the receiver, the receiver cannot receive the signal emitted by the transmitter, and the first phase sensor 121 outputs a signal (e.g., a low-level signal). When the first light-shielding strip 504 is not between the transmitter and the receiver, the receiver can receive the signal emitted by the transmitter, and the first phase sensor 121 outputs another signal (e.g., a high-level signal). Based on this principle, the phase of the first gear 502 can be detected, that is, the phase of the first photosensitive component can be detected. For ease of distinction, the phase of the first photosensitive component is referred to as the "first rotation phase". Alternatively, it can be set so that when the receiver receives light that is not blocked by the first light-shielding strip 504, the first phase sensor 121 outputs a low-level signal. Conversely, when the first light-blocking strip 504 blocks the light and the receiver does not receive the light, the first phase sensor 121 outputs a high-level signal. Thus, when the first photosensitive element rotates through one revolution, a pulse signal is output once, thereby detecting the rotation phase of the first photosensitive element.

[0152] The second phase sensor is configured to detect the second rotational phase of the second photosensitive element.

[0153] In one possible implementation, the second photosensitive element includes a yellow photosensitive element, a magenta photosensitive element, and a cyan photosensitive element. Therefore, detecting the phase of the second photosensitive element means detecting the phase of the yellow photosensitive element, the magenta photosensitive element, and the cyan photosensitive element.

[0154] Please continue reading. Figure 6 In this implementation, since the second gears 602a to 602c corresponding to the yellow, magenta, and cyan photosensitive components in the second photosensitive element are all driven by the second motor 112, and the phases of the second gears 602a to 602c are always registered, only one of the second gears 602a to 602c needs to be phase-detected. Specifically, in Figure 6 In the design, the second gear 602a is equipped with a second phase sensor 122 and a second light-shielding strip. Therefore, the phase of the second gear 602a can be detected in real time by the second phase sensor 122, which means that the phase of the second photosensitive component can be detected. For ease of distinction, the phase of the second photosensitive component is referred to as the "second rotation phase".

[0155] Of course, in some possible implementations, the phase of the second gear 602b or the second gear 602c can also be detected; or, the phases of the second gears 602a to 602c can be detected respectively to obtain the second rotation phase. This application embodiment does not impose specific limitations on this.

[0156] When the first photosensitive element is at a predetermined rotation angle, the first phase sensor 121 outputs a pulse signal. When the second photosensitive element is at a predetermined rotation angle, the second phase sensor 122 outputs a pulse signal. If the time point of the pulse signal falling from the first phase sensor 121 is the same as the time point of the pulse signal falling from the second phase sensor 122, then the phase of the first photosensitive element is the same as the phase of the second photosensitive element. Alternatively, the phase of the first photosensitive element can be determined by whether the time point of the pulse signal rising from the first phase sensor 121 is the same as the time point of the pulse signal rising from the second phase sensor 122. If the falling or rising times of the two signals are inconsistent, it indicates a phase mismatch between the first and second photosensitive elements, requiring phase registration.

[0157] The control unit is configured to perform phase registration of the first photosensitive element and the second photosensitive element according to the first rotation phase and the second rotation phase.

[0158] In one possible implementation, to avoid increasing the output time of the homepage image formation job during phase registration, after completing at least one page of image formation, at least one of the first and second motors receives a phase registration command. Phase registration of the first and second photosensitive components is then performed based on the rotation phase of the photosensitive component corresponding to the motor that received the command. This phase registration can be performed after completing the homepage or multiple page image formation jobs, avoiding the situation in the prior art where performing phase registration before image formation increases the output time of the homepage image formation job and affects user experience. Specifically, when the first phase sensor detects a preset first phase signal, the first motor is controlled to stop after a first fixed time delay; when the second phase sensor detects a preset second phase signal, the second motor is controlled to stop after a second fixed time delay. After the first and second motors stop, the phase difference between the first and second photosensitive components is less than or equal to a preset phase difference threshold.

[0159] See Figure 8 This is a phase matching timing diagram provided in an embodiment of this application. In this timing diagram, the first phase sensor is at a high level when it is not blocked by the first light-shielding strip, and at a low level when it is blocked by the first light-shielding strip; the second phase sensor is at a high level when it is not blocked by the second light-shielding strip, and at a low level when it is blocked by the second light-shielding strip.

[0160] When the first phase sensor detects a falling edge (first phase signal), after a first fixed time T1, the first motor is controlled to stop rotating; and / or when the second phase sensor detects a falling edge (second phase signal), after a second fixed time T2, the second motor is controlled to stop rotating. Since the first and second phase sensors are installed in different positions, and the first and second motors have different loads, the specific values ​​of the first fixed time T1 and the second fixed time T2 need to be obtained through actual testing, and both T1 and T2 are relatively fixed values. Alternatively, the delay time of the first and second motors can be controlled by detecting a rising edge. When the first phase sensor detects a rising edge (first phase signal), after a first fixed time T1, the first motor is controlled to stop rotating; and / or when the second phase sensor detects a rising edge (second phase signal), after a second fixed time T2, the second motor is controlled to stop rotating. By maintaining the absolute value of the difference between the first and second fixed times as a fixed value that meets actual needs, this control method ensures that after the first and second motors stop, the phase difference between the first and second photosensitive components is less than or equal to a preset phase difference threshold. In other words, after stopping, both the first and second photosensitive components remain at a preset phase, in a phase-registered state. When the first and second motors restart at a predetermined speed, there is no need to control the acceleration or deceleration of the two motors; maintaining the predetermined startup speed ensures that the phases of the first and second photosensitive components are registered, meaning that all four color photosensitive components are registered. Phase registration is not required again, thus not increasing the output time of at least one page of the print job, improving the user experience. Understandably, registration can be performed after the first page image is formed, or after multiple pages of images are formed; this application does not impose any limitations on this.

[0161] See Figure 9 This is another phase matching timing diagram provided in this embodiment. In this timing diagram, the first phase sensor is at a high level when it is not blocked by the first light-shielding strip, and at a low level when it is blocked by the first light-shielding strip; the second phase sensor is at a high level when it is not blocked by the second light-shielding strip, and at a low level when it is blocked by the second light-shielding strip.

[0162] exist Figure 8In the phase matching timing, after the first phase sensor detects a falling edge (first phase signal), it delays for a first fixed time T1 before controlling the first motor to stop rotating; and / or after the second phase sensor detects a falling edge (second phase signal), it delays for a second fixed time T2 before controlling the second motor to stop rotating. Both T1 and T2 are relatively fixed values. If a relatively fixed value is used to control the first and second motors to stop after a delay, it will cause the first and second photosensitive components to stop at the same phase after each registration. This means that the photosensitive component will always contact the transfer belt at the same position on the photosensitive component when it stops. Since there is a downward and upward movement of the transfer roller at the start and end of printing, the transfer roller limit block hitting the same position on the photosensitive component each time will cause dirt and damage to the photosensitive component. To solve this problem, in Figure 9 In the phase matching timing, after the first phase sensor detects a falling edge (first phase signal), after a first variable time delay, the first motor is controlled to stop rotating; and / or after the second phase sensor detects a falling edge (second phase signal), after a second variable time delay, the second motor is controlled to stop rotating, wherein after the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

[0163] After completing the previous phase registration operation for the first and second photosensitive components, when at least one of the first and second motors receives a phase registration command, and if a first preset condition is met, phase registration is performed on the first and second photosensitive components using a new first variable time and / or a new second variable time. The new first variable time differs from the first variable time corresponding to the previous phase registration operation, and the new second variable time also differs from the second variable time corresponding to the previous phase registration operation. That is, the final generated first and second variable times will change accordingly.

[0164] The first preset condition can be at least one of the following: the image forming apparatus has finished preheating, the color printing job has been completed, or the color correction (density correction and color registration mismatch correction of the four colors C / M / Y / K) has been completed. Understandably, the first preset condition can also be other conditions that can implement the solution of this embodiment, and this application does not limit them.

[0165] After completing the previous phase registration operation for the first and second photosensitive components, when at least one of the first and second motors receives a phase registration command, and if the second preset condition is met, the first and second photosensitive components are phase registered using the first variable time and / or the second variable time corresponding to the previous phase registration operation. That is, the final generated first and second variable times will not change.

[0166] The second preset condition includes at least one of the following: after completing the black and white printing job, after completing the density correction corresponding to the black and white printing operation (only density correction is performed without color registration mismatch correction of the four colors C / M / Y / K), and after completing the separate preheating of the black imaging component (separate preheating of the black imaging component refers to the rotation of the imaging components such as the developing roller and photosensitive component to perform pre-printing preparation operations). It is understood that the second preset condition may also be other conditions that can achieve the solution of this embodiment, and this application does not limit them.

[0167] Since only the first motor (K) stops during black-and-white printing, and the second motor (Y / M / C) does not start, the phase of the two motors does not change. The first motor can only ensure phase registration by using the previously generated delay time. Alternatively, if the second motor (Y / M / C) receives a command to stop, it can use the previously generated first and second variable times, or a new first and second variable time. Because the first motor (K) continues to rotate during the conversion from color to black-and-white printing, changing the delay time of the second motor (Y / M / C) ensures phase registration between the stopping times of the first motor (K) and the second motor (Y / M / C).

[0168] In addition, the first variable time used at the first printing speed (i.e., normal speed printing) is shorter than the first variable time used at the second printing speed (i.e., slow-speed printing). Similarly, different first and second printing speeds can be set, and different variable times can be set based on different printing speeds.

[0169] Understandably, the actual values ​​of the first and second variable times mentioned above are obtained based on actual tests, and the adjustable values ​​set are also generated from actual tests.

[0170] By controlling the first and second motors to stop after a variable delay, the phase difference between the first and second photosensitive components is ensured to be less than or equal to a preset phase difference threshold. This ensures that the first and second motors stop at different phases each time they perform phase matching, resulting in the photosensitive component contacting the transfer belt at different positions on the photosensitive component each time it stops. This reduces the problem of dirt and damage to the photosensitive component caused by the transfer roller pressing down and lifting up during the printing start and end, which would result in the transfer roller limit block hitting the same position on the photosensitive component every time.

[0171] The phase registration of the first and second photosensitive components can be performed when the first and second motors need to stop, such as during image forming apparatus preheating, toner supply, normal printing, or density correction corresponding to color / black-and-white printing operations. This ensures that the phases of the first and second photosensitive components are registered and prevents color mismatch. It should be noted that when a paper jam occurs, the photosensitive components, transfer belt, and secondary transfer roller need to be cleaned. This requires applying a cleaning voltage to the secondary transfer roller. However, because the voltage applied for imaging must be stopped immediately to prevent developer scattering during this time, phase registration is not convenient. Therefore, phase registration is not performed during the paper jam cleaning sequence.

[0172] See Figure 10 This is a phase diagram of another photosensitive component provided in an embodiment of this application. Figure 10 As shown, after phase registration is completed in the above manner, the phases of the four color photosensitive components remain consistent.

[0173] The first and second motors involved in this application, after completing all current printing tasks (e.g., if there are two print jobs to be completed, after the printing sequence ends), need to enter the phase registration process. An instruction is sent to instruct at least one of the two motors to enter phase registration. The phases of the first and second motors are detected by a first phase sensor and a second phase sensor, respectively. Timing begins when the first phase sensor detects a falling edge (first phase signal) and the second phase sensor detects a falling edge (second phase signal). Alternatively, timing can begin when the first and second phase sensors detect a rising edge (first phase signal) and the second phase sensor detects a rising edge (second phase signal). The timing range can be a first fixed time for the first motor and a second fixed time for the second motor, or a first variable time for the first motor and a second variable time for the second motor. After the predetermined time range is reached, an instruction is sent to control the first and second motors to stop, completing the phase registration of the two motors. Specifically, this can be applied to any application scenario where the motors need to stop according to a stop logic, such as after image formation is completed, after power-on warm-up, or after calibration.

[0174] In another possible implementation, in order to avoid increasing the output time of the first page image formation job during phase registration, after the first page or multi-page image formation job is completed, the first photosensitive component and the second photosensitive component are phase registered according to the first rotation phase and the second rotation phase.

[0175] In specific implementation, after forming at least one page of the image to be printed, the phase difference between the first and second photosensitive components is determined based on the first and second rotational phases. Based on the phase difference between the first and second photosensitive components, the rotational speeds of the first and / or second motors are adjusted so that the phase difference between the first and second photosensitive components is less than or equal to a preset phase difference threshold. For example, after the first page image formation is completed, i.e., after the paper detection sensor (not shown) detects the tail of the first sheet passing the sensor, registration trigger detection phase is required. That is, the two phase sensors begin detecting the rotational phases of the first and second motors respectively. The time difference value corresponding to the phase difference between the two motors is calculated based on the time it takes for the two phase sensors to detect the light-blocking strip. The rotational speeds of the two motors are adjusted based on the time difference value and the preset time difference value, so that the time difference corresponding to the next detection of the phase difference between the two motors is within the tolerance range, indicating that the phase registration of the two motors has been completed. Alternatively, after forming two or more pages of images, i.e., after the paper detection sensor detects the tail of the second or more pages passing the sensor, registration trigger detection phase is required, and phase registration is performed.

[0176] See Figure 11 This is another phase-matching timing diagram provided in an embodiment of this application. For example... Figure 11 As shown, during the motor startup phase, the first motor and the second motor start according to the normal startup logic and reach the reference speed. When printing the first page, the image forming apparatus detects the phase difference Δt between the first photosensitive component and the second photosensitive component through the first phase sensor and the second phase sensor. After printing the first page or multiple pages, the speed of the first motor and / or the second motor is adjusted according to the phase difference Δt so that the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold, that is, phase registration is completed. After phase registration is completed, the first motor and the second motor return to the reference speed and start printing the second page.

[0177] In this embodiment, since phase registration is performed after the image formation of the homepage or multiple pages is completed, the output time of the image formation of the homepage or multiple pages will not be increased, thus improving the user experience.

[0178] In specific implementation, the rotational speed of the first motor and / or the second motor is adjusted according to the phase difference between the first photosensitive component and the second photosensitive component, so that the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold, including the following three rotational speed adjustment methods.

[0179] The timing of phase registration between the two motors can be either after the first page of the job has been printed, in which case the phase registration command is sent and phase registration is performed during the printing of the first page of the job, or it can be performed during the subsequent printing process after multiple pages of the job have been printed. This application does not impose any restrictions on this.

[0180] First method of speed adjustment:

[0181] The first motor is controlled to maintain a reference speed, while the speed of the second motor is adjusted so that the phase difference between the first and second photosensitive components is less than or equal to a preset phase difference threshold. Then, the speed of the second motor is restored to the reference speed. Figure 11 The situation is shown.

[0182] The second method of speed adjustment:

[0183] The second motor is controlled to maintain a reference speed, and the speed of the first motor is adjusted so that the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold. Then the speed of the first motor is restored to the reference speed.

[0184] The third method of speed adjustment:

[0185] Simultaneously adjust the rotation speeds of the first motor and the second motor so that the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold, and then restore the rotation speeds of both the first motor and the second motor to the reference rotation speed.

[0186] See Figure 12 This is another phase-matching timing diagram provided in an embodiment of this application. For example... Figure 12 As shown, after phase detection is completed, the rotational speed of the first motor is increased while the rotational speed of the second motor is decreased, so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold. It can be understood that adjusting the first and second motors simultaneously in this implementation can shorten the phase registration time. Of course, in other application scenarios, the rotational speed of the first motor can be decreased while the rotational speed of the second motor can be increased; this embodiment does not impose specific limitations on this.

[0187] In one possible implementation, the control unit is further configured to control the first and second motors to start sequentially at different times when they start. Typically, the load generated in the circuit when the motors start is relatively heavy; starting the first and second motors sequentially can reduce the load on the imaging device.

[0188] In summary, in the above embodiments, after completing at least one page of image formation, at least one of the first and second motors receives a phase registration command and performs phase registration on the first and second photosensitive components based on the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. However, in practical applications, even after the motor speed stabilizes and during long-term image formation operations, phase differences may still exist between different photosensitive components. Therefore, based on the above embodiments, this application can further perform phase registration based on the phase difference between different photosensitive components after the motor speed stabilizes. Specifically, after the motor speed stabilizes, the first rotation phase of the first photosensitive component and the second rotation phase of the second photosensitive component are detected in real time. If the phase difference between the first and second rotation phases is greater than or equal to a preset phase difference threshold, phase registration is performed. Detailed descriptions of specific embodiments follow.

[0189] See Figure 13 This is another phase-matching timing diagram provided in an embodiment of this application. For example... Figure 13 As shown, the timing diagrams for the second and first phase sensors respectively illustrate the pulse signals output by the second and first photosensitive components for each revolution. Conversely, the timing diagrams for the second and first motors respectively illustrate their rotational speeds.

[0190] At time t0, the first and second photosensitive components remain stationary while maintaining a predetermined phase relationship. At time t1, the first and second motors simultaneously begin operation. The second motor is accelerated to a rotational speed of Vt0_CL required for image formation. The first motor is accelerated to a rotational speed of Vt0_BK required for image formation. The rotational speeds Vt0_CL and Vt0_BK are the same if the diameters of the second and first photosensitive components are the same, and if the gear ratio between the second motor and each of the second photosensitive components is the same as the gear ratio between the first motor and the first photosensitive component. After a time period Ta_CL has elapsed since the second motor began operation, the rotational speed of the second motor reaches the rotational speed Vt0_CL. Conversely, after a time period Ta_BK has elapsed since the first motor began operation, the rotational speed of the first motor reaches the rotational speed Vt0_BK. At this point, control is executed such that after the second and first motors reach the rotational speeds required for image formation, the rotational speeds for image formation remain constant.

[0191] Subsequently, at time t2, the phase difference between the second photosensitive element and the first photosensitive element is detected. When the second photosensitive element is at a predetermined rotation angle, the second phase sensor outputs a pulse signal. When the first photosensitive element is at a predetermined rotation angle, the first phase sensor outputs a pulse signal. This configuration is designed such that if the rise time of the pulse signal from the second phase sensor is the same as the rise time of the pulse signal from the first phase sensor, then the phase of the second photosensitive element is the same as the phase of the first photosensitive element. Figure 13 shows the phase of the first photosensitive element detected by the first phase sensor, which lags behind the phase of the second photosensitive element detected by the second phase sensor by a phase difference Δt.

[0192] At time t3, the first motor, which has a lagging phase, is accelerated to a rotational speed Vt1_BK higher than its rotational speed Vt0_BK. This causes the lagging phase of the first photosensitive element to catch up with the phase of the second photosensitive element. Subsequently, at time t4, when the phase difference Δt between the pulse signals output from the second and first phase sensors becomes less than or equal to a predetermined value, the rotational speed of the first motor returns to its original rotational speed Vt0_BK. This predetermined value of the phase difference is used to determine the point at which the first motor, rotating at a speed of Vt1_BK, begins to decelerate. This predetermined value of the phase difference is set to a value that makes the phase of the first photosensitive element the same as or substantially the same as the phase of the second photosensitive element when the first motor decelerates to its rotational speed Vt0_BK; that is, a value that makes the difference between the phase of the pulse signal from the first and second phase sensors zero or substantially zero. Thus, the difference between the phase of the second and first photosensitive elements can be set to be less than or equal to this predetermined value. Afterward, image formation begins at time t5 and ends at time t6. At time t6, when the image forming operation ends, the first motor begins to decelerate. After a time interval ΔT_OFF has elapsed since time t6, the second motor begins to decelerate. The time interval ΔT_OFF is the time difference used to simultaneously stop the second and first motors. At time t7, the second and first motors stop with a predetermined phase relationship. Similarly, the first motor can also decelerate and then accelerate to a predetermined speed for phase registration of the four photosensitive components. This application does not impose any limitations on the comparison.

[0193] See Figure 14 This is a structural block diagram of another image forming apparatus provided in an embodiment of this application. Figure 14 As shown, the image forming apparatus mainly includes the following functional units.

[0194] The first motor is configured to rotate the first photosensitive element;

[0195] The second motor is configured to rotate the second photosensitive element;

[0196] The third motor is configured to rotate the third photosensitive element;

[0197] The fourth motor is configured to rotate the fourth photosensitive element;

[0198] A first phase sensor is configured to detect a first rotational phase of a first photosensitive element;

[0199] The second phase sensor is configured to detect the second rotational phase of the second photosensitive element;

[0200] The third phase sensor is configured to detect the third rotational phase of the third photosensitive element;

[0201] The fourth phase sensor is configured to detect the fourth rotational phase of the fourth photosensitive element;

[0202] The control unit is configured to, after completing at least one page of image formation, perform phase registration on the first, second, third, and fourth photosensitive components according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command, after receiving a phase registration command from at least one of the first, second, third, and fourth photosensitive components. The phase registration command is used to indicate that the first, second, third, and fourth photosensitive components need to be phase registered.

[0203] The image forming device and Figure 4 The difference in the image forming apparatus shown is that each of the four photosensitive components is driven by an independent motor. Since the four photosensitive components are relatively independent, their phases need to be detected separately using phase sensors. During phase registration, these four photosensitive components need to be calibrated sequentially.

[0204] To facilitate understanding, the following explanation, using a specific implementation method, illustrates that "after completing the image forming operation of at least one page, at least one of the first, second, third, and fourth motors receives a phase registration command and performs phase registration on the first, second, third, and fourth photosensitive components according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command."

[0205] See Figure 15 This is another phase matching timing diagram provided in an embodiment of this application. In this timing diagram, the first phase sensor is at a high level when it is not blocked by the first light-shielding strip, and at a low level when it is blocked by the first light-shielding strip; the second phase sensor is at a high level when it is not blocked by the second light-shielding strip, and at a low level when it is blocked by the second light-shielding strip; the third phase sensor is at a high level when it is not blocked by the third light-shielding strip, and at a low level when it is blocked by the third light-shielding strip; the fourth phase sensor is at a high level when it is not blocked by the fourth light-shielding strip, and at a low level when it is blocked by the fourth light-shielding strip.

[0206] When the first phase sensor detects a falling edge, it delays for a first fixed time T1 and controls the first motor to stop rotating. When the second phase sensor detects a falling edge, it delays for a second fixed time T2 and controls the second motor to stop rotating. When the third phase sensor detects a falling edge, it delays for a third fixed time T3 and controls the third motor to stop rotating. When the fourth phase sensor detects a falling edge, it delays for a fourth fixed time T4 and controls the fourth motor to stop rotating. Understandably, at least one or more of the first, second, third, and fourth motors can also be controlled to stop rotating after a fixed delay. Because the first, second, third, and fourth phase sensors are installed in different positions, and the first, second, third, and fourth motors have different loads, the specific values ​​of the first fixed time T1, second fixed time T2, third fixed time T3, and fourth fixed time T4 need to be obtained through actual testing. According to this control method, after the first, second, third, and fourth motors stop, the phase difference between any two of the first, second, third, and fourth photosensitive components is less than or equal to a preset phase difference threshold. In other words, after stopping, the first, second, third, and fourth photosensitive components all remain at their preset phases, in a phase-registered state. When the first, second, third, and fourth motors restart, the phases of the first, second, third, and fourth photosensitive components are already registered; that is, all four color photosensitive components are registered, eliminating the need for phase registration again. This avoids increasing the output time for homepage or multi-page image generation jobs, thus improving the user experience.

[0207] Understandably, the delay times of the first, second, third, and fourth motors can also be set to a first variable time, a second variable time, a third variable time, and a fourth variable time, respectively. That is, when the first phase sensor detects a falling edge, the first motor stops rotating after a first variable time delay; when the second phase sensor detects a falling edge, the second motor stops rotating after a second variable time delay; when the third phase sensor detects a falling edge, the third motor stops rotating after a third variable time delay; and when the fourth phase sensor detects a falling edge, the fourth motor stops rotating after a fourth variable time delay. Understandably, at least one or more of the first, second, third, and fourth motors can also be controlled to stop rotating after a variable time delay. Wherein, after the first, second, third, and fourth motors stop, the phase difference between the first, second, third, and fourth photosensitive components is less than or equal to a preset phase difference threshold. This ensures that the contact point between the photosensitive element and the transfer belt is a different location on the photosensitive element each time printing stops. This reduces the risk of the transfer roller pressing down and lifting up during printing start and end, which would cause the transfer roller limit block to impact the same location on the photosensitive element every time. For settings of the first, second, third, and fourth variable times, please refer to [reference needed]. Figure 9 The description of the illustrated embodiments will not be repeated here for the sake of brevity.

[0208] For specific details regarding the embodiments of this application, please refer to [link / reference needed]. Figure 4 The description of the illustrated embodiments will not be repeated here for the sake of brevity.

[0209] Corresponding to the above embodiments, this application also provides a phase registration method for a photosensitive component.

[0210] See Figure 16 This is a schematic flowchart illustrating a phase registration method for a photosensitive component provided in an embodiment of this application. This method can be applied to... Figure 4 The image forming apparatus shown, such as Figure 16 As shown, it mainly includes the following steps.

[0211] S1601: After completing at least one page of image formation, at least one of the first motor and the second motor receives a phase registration instruction and performs phase registration on the first photosensitive component and the second photosensitive component according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration instruction. The phase registration instruction is used to indicate that the first photosensitive component and the second photosensitive component need to be phase registered.

[0212] In one possible implementation, S1601 specifically includes: when the first phase sensor detects a preset first phase signal, controlling the first motor to stop rotating after a first fixed time delay; and / or when the second phase sensor detects a preset second phase signal, controlling the second motor to stop rotating after a second fixed time delay; wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

[0213] Understandably, the delay times of the first motor and the second motor can also be set to a first variable time and a second variable time, respectively. When the first phase sensor detects a preset first phase signal, the first motor is controlled to stop rotating after a delay of the first variable time; when the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a delay of the second variable time. After the first and second motors stop, the phase difference between the first and second photosensitive components is less than or equal to a preset phase difference threshold. This ensures that the contact position between the photosensitive component and the transfer belt is a different position on the photosensitive component each time it stops, reducing the problem of dirt and damage to the photosensitive component caused by the transfer roller pressing down and lifting up once at the start and end of printing, and the transfer roller limit block hitting the same position on the photosensitive component every time. The setting scheme for the first and second variable times can be found in [reference needed]. Figure 9 The description of the illustrated embodiments will not be repeated here for the sake of brevity.

[0214] See Figure 17 This is a schematic flowchart illustrating another phase registration method for a photosensitive component provided in an embodiment of this application. This method can be applied to... Figure 4 The image forming apparatus shown, such as Figure 17 As shown, it mainly includes the following steps.

[0215] S1701: During or after performing at least one page image formation operation in a print job, the phase difference between the first photosensitive element and the second photosensitive element is determined based on the first rotation phase and the second rotation phase.

[0216] In one possible implementation, S1701 specifically includes: during the execution of at least one page image formation operation in the print job or after the execution of at least one page image formation operation in the print job, determining the phase difference between the first photosensitive component and the second photosensitive component based on the first rotation phase and the second rotation phase; adjusting the rotation speed of the first motor and / or the second motor based on the phase difference between the first photosensitive component and the second photosensitive component, such that the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

[0217] In one possible implementation, adjusting the rotational speed of the first motor and / or the second motor based on the phase difference between the first and second photosensitive components, such that the phase difference between the first and second photosensitive components is less than or equal to a preset phase difference threshold, includes: controlling the first motor to maintain a reference rotational speed and adjusting the rotational speed of the second motor to make the phase difference between the first and second photosensitive components less than or equal to the preset phase difference threshold; or, controlling the second motor to maintain a reference rotational speed and adjusting the rotational speed of the first motor to make the phase difference between the first and second photosensitive components less than or equal to the preset phase difference threshold; or, simultaneously adjusting the rotational speeds of the first and second motors to make the phase difference between the first and second photosensitive components less than or equal to the preset phase difference threshold.

[0218] In one possible implementation, Figure 16 and Figure 17 Based on the method shown, it also includes: when the first motor and the second motor start, controlling the first motor and the second motor to start at different times.

[0219] In one possible implementation, Figure 16 and Figure 17 In the method shown, the first photosensitive component includes a black photosensitive component; the second photosensitive component includes a yellow photosensitive component, a magenta photosensitive component, and a cyan photosensitive component.

[0220] In this embodiment, after completing at least one page of image formation, at least one of the first and second motors receives a phase registration command. Based on the rotation phase of the photosensitive component corresponding to the motor that received the command, the first and second photosensitive components are phase-registered. This does not increase the output time of the first page or multiple page image formation operations, thus improving the user experience. It should be noted that the specific details of this method embodiment can be found in [link to relevant documentation]. Figure 4 For the sake of brevity, the description of the embodiment of the image forming apparatus will not be repeated here.

[0221] Corresponding to the above embodiments, this application also provides another phase registration method for a photosensitive component, which can be applied to... Figure 14 The image forming apparatus shown mainly includes the following steps.

[0222] After completing the image forming operation of at least one page, at least one of the first motor, second motor, third motor, and fourth motor receives a phase registration command and performs phase registration on the first photosensitive component, second photosensitive component, third photosensitive component, and fourth photosensitive component according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. The phase registration command is used to indicate that the first photosensitive component, second photosensitive component, third photosensitive component, and fourth photosensitive component need to be phase registered.

[0223] It should be noted that the specific details of the method embodiments can be found in [reference needed]. Figure 14 For the sake of brevity, the description of the embodiment of the image forming apparatus will not be repeated here.

[0224] Corresponding to the above embodiments, this application also provides a computer-readable storage medium, wherein the computer-readable storage medium may store a program, wherein when the program runs, it can control the device where the computer-readable storage medium is located to execute some or all of the steps in the above method embodiments. Specifically, the computer-readable storage medium may be a magnetic disk, an optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0225] Corresponding to the above embodiments, this application also provides a computer program product containing executable instructions that, when executed on a computer, cause the computer to perform some or all of the steps in the above method embodiments.

[0226] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0227] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0228] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0229] In the several embodiments provided in this application, any function, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0230] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.

Claims

1. An image forming apparatus, characterized in that, include: The first motor is configured to rotate the first photosensitive element; The second motor is configured to rotate the second photosensitive element; A first phase sensor is configured to detect a first rotational phase of a first photosensitive element; The second phase sensor is configured to detect the second rotational phase of the second photosensitive element; The control unit is configured as follows: After completing at least one page of image formation, at least one of the first motor and the second motor receives a phase registration command and performs phase registration on the first photosensitive component and the second photosensitive component according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. The phase registration command is used to indicate that the first photosensitive component and the second photosensitive component need to be phase registered. The control unit is also configured to: When the first phase sensor detects a preset first phase signal, the first motor is controlled to stop rotating after a first fixed time or a first variable time; and / or When the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a second fixed time or a second variable time. Wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold, so that they are in a phase registration state.

2. The image forming apparatus according to claim 1, characterized in that, The control unit is specifically configured as follows: After completing the previous phase registration operation for the first and second photosensitive components, when at least one of the first and second motors receives the phase registration command, and a first preset condition is met, phase registration is performed on the first and second photosensitive components using a new first variable time and / or a new second variable time, wherein the new first variable time is different from the first variable time corresponding to the previous phase registration operation, and the new second variable time is different from the second variable time corresponding to the previous phase registration operation; or The control unit is specifically configured to: after completing the previous phase registration operation for the first photosensitive component and the second photosensitive component, when at least one of the first motor and the second motor receives the phase registration command, and when the second preset condition is met, to perform phase registration on the first photosensitive component and the second photosensitive component using the first variable time and / or the second variable time corresponding to the previous phase registration operation.

3. The image forming apparatus according to claim 1, characterized in that, When the printing speed of the image forming apparatus is a first printing speed, the control unit is specifically configured to perform phase registration operation on the first photosensitive element and the second photosensitive element using a third sub-variable time; when the printing speed of the image forming apparatus is a second printing speed, the control unit is specifically configured to perform phase registration operation on the first photosensitive element and the second photosensitive element using a fourth sub-variable time, wherein when the first printing speed is greater than the second printing speed, the third sub-variable time is less than the fourth sub-variable time.

4. The image forming apparatus according to claim 1, characterized in that, The control unit is specifically configured to: when at least one of the first motor and the second motor receives the phase registration command, and when the initially determined first variable time exceeds the first preset value or the initially determined second variable time exceeds the second preset value, perform phase registration operation on the first photosensitive component and the second photosensitive component using a new first variable time and / or a new second variable time, wherein the new first variable time does not exceed the first preset value and the new second variable time does not exceed the second preset value.

5. The image forming apparatus according to claim 2, characterized in that, The first preset condition includes at least one of the following: the image forming device has finished preheating, the color printing job has been completed, and the color correction has been completed. The second preset condition includes at least one of the following: the black and white printing job has been completed, the density correction corresponding to the black and white printing operation has been completed, and the black imaging component has been preheated separately.

6. The image forming apparatus according to claim 1, characterized in that, The control unit is specifically configured to: determine the phase difference between the first photosensitive element and the second photosensitive element based on the first rotation phase and the second rotation phase during or after performing at least one page image formation operation in a print job; Based on the phase difference between the first photosensitive element and the second photosensitive element, the rotational speed of the first motor and / or the second motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

7. The image forming apparatus according to claim 6, characterized in that, The control unit is specifically configured as follows: The first motor is controlled to maintain a reference speed, and the speed of the second motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold. or, The second motor is controlled to maintain a reference speed, and the speed of the first motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold. or, Simultaneously adjust the rotation speeds of the first motor and the second motor so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

8. The image forming apparatus according to claim 1, characterized in that, The first photosensitive element includes a black photosensitive element, and the second photosensitive element includes at least one of a yellow photosensitive element, a magenta photosensitive element, and a cyan photosensitive element; or The first photosensitive drum is one of a yellow photosensitive component, a magenta photosensitive component, and a cyan photosensitive component, and the second photosensitive component is the other of a yellow photosensitive component, a magenta photosensitive component, and a cyan photosensitive component.

9. A phase registration method for a photosensitive component, characterized in that, An image forming apparatus is applied to an image forming apparatus, the image forming apparatus comprising: a first motor configured to rotate a first photosensitive element; a second motor configured to rotate a second photosensitive element; a first phase sensor configured to detect a first rotation phase of the first photosensitive element; and a second phase sensor configured to detect a second rotation phase of the second photosensitive element; the method comprising: After completing at least one page of image formation, at least one of the first motor and the second motor receives a phase registration command and performs phase registration on the first photosensitive component and the second photosensitive component according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. The phase registration command is used to indicate that the first photosensitive component and the second photosensitive component need to be phase registered. Specifically, after completing at least one page of image formation, when at least one of the first and second motors receives a phase registration command, the first and second photosensitive components are phase-registered according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. When the first phase sensor detects a preset first phase signal, the first motor is controlled to stop rotating after a first fixed time or a first variable time; and / or When the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a second fixed time or a second variable time. Wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold, so that they are in a phase registration state.

10. The phase registration method according to claim 9, characterized in that, The phase registration method further includes: After completing the previous phase registration operation for the first and second photosensitive components, when at least one of the first and second motors receives the phase registration command, and a first preset condition is met, phase registration is performed on the first and second photosensitive components using a new first variable time and / or a new second variable time, wherein the new first variable time is different from the first variable time corresponding to the previous phase registration operation, and the new second variable time is different from the second variable time corresponding to the previous phase registration operation; or After completing the previous phase registration operation for the first photosensitive element and the second photosensitive element, when at least one of the first motor and the second motor receives the phase registration command, and when the second preset condition is met, the first variable time and / or the second variable time corresponding to the previous phase registration operation are used to perform phase registration on the first photosensitive element and the second photosensitive element.

11. The phase registration method according to claim 9, characterized in that, When the printing speed of the image forming apparatus is a first printing speed, a third sub-variable time is used to perform phase registration operation on the first photosensitive element and the second photosensitive element; when the printing speed of the image forming apparatus is a second printing speed, a fourth sub-variable time is used to perform phase registration operation on the first photosensitive element and the second photosensitive element, wherein when the first printing speed is greater than the second printing speed, the third sub-variable time is less than the fourth sub-variable time.

12. The phase registration method according to claim 9, characterized in that, The phase registration method further includes: When at least one of the first motor and the second motor receives the phase registration command, if the initially determined first variable time exceeds the first preset value or the initially determined second variable time exceeds the second preset value, a phase registration operation is performed on the first photosensitive component and the second photosensitive component using a new first variable time and / or a new second variable time, wherein the new first variable time does not exceed the first preset value and the new second variable time does not exceed the second preset value.

13. The phase registration method according to claim 9, characterized in that, After completing the image forming operation for at least one page, upon receiving a phase registration command, the first and second photosensitive components are phase-registered according to the rotation phase of the photosensitive component corresponding to the motor that received the phase registration command. This specifically includes: During or after the formation of at least one page of an image in a print job, the phase difference between the first photosensitive element and the second photosensitive element is determined based on the first rotation phase and the second rotation phase. Based on the phase difference between the first photosensitive element and the second photosensitive element, the rotational speed of the first motor and / or the second motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

14. The phase registration method according to claim 13, characterized in that, The step of adjusting the rotational speed of the first motor and / or the second motor based on the phase difference between the first photosensitive component and the second photosensitive component, so that the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold, specifically includes: The first motor is controlled to maintain a reference speed, and the speed of the second motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold. or, The second motor is controlled to maintain a reference speed, and the speed of the first motor is adjusted so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold. or, Simultaneously adjust the rotation speeds of the first motor and the second motor so that the phase difference between the first photosensitive element and the second photosensitive element is less than or equal to a preset phase difference threshold.

15. A phase registration method for a photosensitive element, characterized in that, An image forming apparatus is applied to an image forming apparatus, the image forming apparatus comprising: a first motor configured to rotate a first photosensitive element; a second motor configured to rotate a second photosensitive element; a first phase sensor configured to detect a first rotation phase of the first photosensitive element; and a second phase sensor configured to detect a second rotation phase of the second photosensitive element; the method comprising: When the first phase sensor detects a preset first phase signal, the first motor is controlled to stop rotating after a first variable time delay; and / or When the second phase sensor detects a preset second phase signal, the second motor is controlled to stop rotating after a second variable time delay; Wherein, after both the first motor and the second motor stop rotating, the phase difference between the first photosensitive component and the second photosensitive component is less than or equal to a preset phase difference threshold.

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