Laser scanning correction method and apparatus

Abstract

The application relates to the image forming field, in particular to a laser scanning correction method and device. A laser scanning correction method is applied to a control component of an image forming device, and the method comprises the following steps: detecting a first pulse width of a line synchronization signal of a laser scanning unit (LSU) in a first operation mode; calculating a pulse width compensation value of the first pulse width by using a second pulse width of a correction line synchronization signal of the laser scanning unit (LSU) in a second operation mode; and performing operation after compensating the line synchronization signal in the first operation mode by using the pulse width compensation value. The application unifies the time of the falling edge occurrence in the first pulse width of the laser output by each LSU, unifies the time of scanning the photosensitive component by each LSU, and realizes the correction of the image color matching time.

Description

[Technical Field]

[0001] This application relates to the field of image formation, and more particularly to a laser scanning correction method and apparatus. [Background Technology]

[0002] In performing image forming operations, the image forming apparatus uses a laser scanning unit (LSU) to emit a laser beam to scan the photosensitive component, forming an electrostatic latent image on the component. The photosensitive component then attracts toner through the latent image, transferring the image onto a transfer belt. Finally, the image is printed onto a printing medium using the transfer belt.

[0003] When scanning the photosensitive component, the LSU typically uses the LSU BD sensor built into the LSU to determine the horizontal synchronization signal of the laser beam it emits, and determines the timing of scanning the photosensitive component based on the pulse width in the horizontal synchronization signal.

[0004] Due to the sensitivity differences between different LSU BD sensors, when performing multi-color printing using multiple LSUs, the variations in the BD sensors can cause differences in the line synchronization signals of the laser beams emitted by each LSU. This can further lead to inconsistent scanning timing of the photosensitive components by the LSUs, resulting in color registration problems and affecting image quality. [Summary of the Invention]

[0005] In view of this, embodiments of the present invention provide a laser scanning correction method and apparatus. By acquiring the second pulse width of the laser output by the LSU in correction mode, and using the second pulse width as a reference, the first pulse width of the laser output by the LSU in normal operating mode is compensated and corrected to solve the problem of inconsistent LSU scanning timing.

[0006] In a first aspect, embodiments of the present invention provide a laser scanning correction method, the method being applied to a control component of an image forming apparatus, the method comprising:

[0007] The first pulse width of the line synchronization signal of the laser scanning unit (LSU) in the first operating mode is detected;

[0008] Using the second pulse width of the correction line synchronization signal of the laser scanning unit LSU in the second operating mode, the pulse width compensation value of the first pulse width is calculated;

[0009] The operation is performed after the line synchronization signal in the first operation mode is compensated using the pulse width compensation value.

[0010] Optionally, the first operating mode is a normal operating mode, and the second operating mode is a calibration operating mode. The detection of the first pulse width of the line synchronization signal of the laser scanning unit (LSU) in the first operating mode includes:

[0011] The laser diode is controlled to emit a laser beam according to the laser emission signal. The LSU is controlled to emit laser light to the laser diode BD sensor through the laser diode. When the input terminal of the BD sensor receives the laser beam, it outputs the line synchronization pulse signal.

[0012] Acquire the line synchronization pulse signal output by the BD sensor;

[0013] The first pulse width of the line synchronization signal in the normal operating mode is determined based on the falling edge and rising edge of the line synchronization pulse signal.

[0014] Optionally, controlling the LSU to emit a laser beam to the BD sensor via a laser diode includes:

[0015] The LSU drives the LSU motor to rotate, thereby adjusting the prism mounted on the LSU motor to a suitable angle;

[0016] The laser beam emitted by the laser diode is reflected to the BD sensor through the prism.

[0017] Optionally, the second pulse width includes:

[0018] Before the LSU performs its first laser scan, the LSU is controlled to output a calibration line synchronization signal at standard optical power;

[0019] The second pulse width of the correction line synchronization signal is determined based on the falling edge and rising edge of the correction line synchronization signal.

[0020] Optionally, the step of calculating the pulse width compensation value of the first pulse width using the second pulse width of the corrected line synchronization signal of the LSU in the second operating mode includes:

[0021] The pulse width compensation value is determined by the difference between the first pulse width and the second pulse width.

[0022] Optionally, the step of compensating the line synchronization signal in the first operating mode using the pulse width compensation value before performing the operation includes:

[0023] The first operation time is determined by the falling edge of the first pulse width of the line synchronization signal;

[0024] The second operation time is obtained by compensating the first operation time with the pulse width compensation value.

[0025] The scanning job is performed based on the second job time.

[0026] Secondly, embodiments of the present invention provide a laser scanning correction device, comprising:

[0027] The detection module detects the first pulse width of the line synchronization signal of the laser scanning unit (LSU) in the first operating mode;

[0028] The calculation module uses the second pulse width of the correction line synchronization signal of the LSU in the second operating mode to calculate the pulse width compensation value of the first pulse width;

[0029] The operation module uses the pulse width compensation value to compensate the line synchronization signal in the first operation mode before performing the operation.

[0030] Optionally, the detection module further includes:

[0031] The transmitting module controls the laser diode to emit a laser beam according to the laser emission signal, and controls the LSU to emit a laser beam to the laser diode BD sensor through the laser diode. When the input terminal of the BD sensor receives the laser beam, it outputs the line synchronization pulse signal.

[0032] The acquisition module acquires the line synchronization pulse signal output by the BD sensor;

[0033] The first determining module determines the first pulse width of the line synchronization signal in the normal operating mode based on the falling edge and rising edge of the line synchronization pulse signal.

[0034] Optionally, the transmitting module includes:

[0035] The rotation module controls the LSU to drive the LSU motor to rotate, thereby adjusting the prism mounted on the LSU motor to a suitable angle, and reflecting the laser beam emitted by the laser diode to the BD sensor through the prism.

[0036] Optionally, the detection module is further configured to detect the second pulse width, including:

[0037] Before the LSU performs its first laser scan, the LSU is controlled to output a calibration line synchronization signal at standard optical power;

[0038] The second pulse width of the correction line synchronization signal is determined based on the falling edge and rising edge of the correction line synchronization signal.

[0039] Optionally, the computing module includes:

[0040] The pulse width compensation value is determined by the difference between the first pulse width and the second pulse width.

[0041] Optionally, the operation module further includes:

[0042] The second determining module determines the first operation time by the falling edge of the first pulse width of the line synchronization signal;

[0043] The compensation module compensates the first operation time using the pulse width compensation value to obtain the second operation time;

[0044] The scanning module performs a scanning job based on the second job time.

[0045] Thirdly, embodiments of the present invention provide a laser scanning correction device, comprising:

[0046] At least one processor; and

[0047] At least one memory communicatively connected to the processor, wherein:

[0048] The memory stores program instructions that can be executed by the processor, which can invoke the program instructions to perform the method as described in any of the first aspects.

[0049] Fourthly, embodiments of the present invention provide a computer-readable storage medium comprising a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform any of the methods described in the first aspect.

[0050] The above scheme unifies the appearance time of the falling edge in the first pulse width of each LSU output laser, that is, unifies the scanning time of each LSU photosensitive component, thereby achieving the correction of the color registration timing of the image. [Attached Image Description]

[0051] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 A schematic diagram of a laser pulse width provided for an embodiment of the present invention;

[0053] Figure 2 A flowchart of a laser scanning correction method provided in an embodiment of the present invention;

[0054] Figure 3 This is a schematic diagram of the structure of an LSU provided in an embodiment of the present invention;

[0055] Figure 4 A schematic diagram of another laser pulse width provided for an embodiment of the present invention;

[0056] Figure 5 This is a schematic diagram of the structure of a laser scanning correction device provided in an embodiment of the present invention;

[0057] Figure 6 This is a schematic diagram of another laser scanning correction device provided in an embodiment of the present invention;

[0058] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

Detailed Implementation Methods

[0059] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0060] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0061] When performing image forming tasks, the image forming equipment scans the photosensitive component, which serves as the image carrier, using a laser emitted by the LSU (Light Suspension Unit), forming an electrostatic latent image on the photosensitive component. Toner is then adsorbed onto the electrostatic latent image to form a toner image. The toner image on the photosensitive component is transferred onto a transfer belt, and finally, the image is formed on the printing medium via the transfer belt.

[0062] To perform color image formation, the image forming apparatus is equipped with four different colors of toner: yellow, cyan, magenta, and black. For each color of toner, a laser scanning unit (LSU) is provided. There can be four different sets of LSUs, each capable of forming an image for one color of toner; two different sets of LSUs, each capable of forming an image for at least one color of toner; or one set of LSUs capable of forming images for all four colors of toner. Understandably, with four different sets of LSUs for forming images for each color of toner, during color image formation, each set of LSUs independently scans its own photosensitive component and forms the toner image. That is, the LSU carrying yellow toner only forms the yellow toner image, the LSU carrying cyan toner only forms the cyan toner image, and finally, the toner images formed by each of the four sets of LSUs are transferred onto a transfer belt, achieving the superposition of the four toner images to obtain the final color image on the transfer belt.

[0063] The overlay of the four toner images on the transfer belt requires extremely strict control. Any deviation in the overlay of any toner image will cause discrepancies in the final image, resulting in color registration problems. For example, ghosting or color deviations may occur, affecting the final image quality. Generally, discrepancies in the timing of the four LSUs scanning the photosensitive components lead to discrepancies in the timing of their subsequent overlay on the transfer belt. To avoid image registration problems, it is essential to ensure that each LSU begins scanning the photosensitive components at the same time, thereby correcting for time discrepancies.

[0064] Specifically, when scanning the photosensitive element, the LSU emits a laser beam that illuminates the LSU BD sensor inside the LSU. The timing of scanning the photosensitive element is determined based on the horizontal sync pulse signal output by the LSU BD sensor. Specifically, the timing of the LSU starting to scan the photosensitive element is determined by the appearance of the falling edge in the horizontal sync signal.

[0065] In some cases, the intensity of the laser beam emitted by the laser scanning unit (LSU) may vary, or there may be differences in sensitivity between different models of LSU BD sensors. Even identical LSU BD sensors may have different optical power in different modes. All of these can cause changes in the pulse width of the line synchronization signal, resulting in timing deviations of the scanning photosensitive components of each LSU group, thus causing color registration problems in color images.

[0066] like Figure 1 The diagram shown is a schematic representation of a laser pulse width provided in an embodiment of this application. See also... Figure 1The laser scanning unit (LSU) emits a laser beam, which illuminates the LSU BD sensor. Under normal circumstances, the LSU BD sensor detects the beam at position C and outputs a synchronization pulse signal. If the laser intensity is strong, or the LSU BD sensor has high sensitivity, the LSU BD sensor will detect the beam earlier, i.e., at position A, and the falling edge of the generated horizontal synchronization pulse signal 1 will appear earlier. If the laser intensity is weak, or the LSU BD sensor has low sensitivity, the LSU BD sensor will detect the beam later, i.e., at position B, and the falling edge of the generated horizontal synchronization signal 2 will appear later.

[0067] Since LSU lasers use the time when the falling edge of the sync pulse signal appears as the timing for scanning the photoreceptor, if the falling edge of the sync pulse signal produced by different LSUs appears at different times, it will cause errors in the scanning timing of different LSUs, thus affecting the color registration of the image.

[0068] In this embodiment of the invention, when a new LSU is replaced in the image forming apparatus, the LSU is controlled to output laser in correction mode. The horizontal sync pulse signal is acquired by the LSU BD sensor, and its pulse width, i.e., the second pulse width, is determined. Using the second pulse width as a reference, each LSU needs to compensate and correct the first pulse width of the current operation by using the second pulse width each time it scans the photosensitive component in normal operating mode. This achieves the alignment and unification of the scanning timing of each LSU by using the falling edge of the horizontal sync signal in correction mode as the scanning timing of each LSU.

[0069] like Figure 2 The diagram shows a flowchart of a laser scanning correction method provided in an embodiment of the present invention. This method is applied to the control component of an image forming apparatus, and the specific steps of the method include:

[0070] S201, detect the first pulse width of the line synchronization signal of the laser scanning unit LSU in normal operating mode (first operating mode).

[0071] Specifically, when performing an image forming task, the image forming apparatus enters a first operating mode. In the first operating mode, the control LSU emits laser light to the BD sensor via a laser diode. When the BD sensor receives the laser light, it outputs a horizontal sync pulse signal at its output terminal. The horizontal sync pulse signal output by the BD sensor is acquired, and after the horizontal sync pulse signal stabilizes, the first pulse width W1 of the horizontal sync pulse signal in the first operating mode is determined by the falling edge and the rising edge of the signal.

[0072] like Figure 3 The diagram shown is a schematic of the internal structure of an LSU provided in the application.

[0073] The LSU internally houses a laser diode, an LSU motor, a prism, and a BD sensor. The prism is mounted on the LSU motor, and its angle can be adjusted by controlling the rotation of the LSU motor.

[0074] The laser emitted by the laser diode shines onto the prism. By driving the LSU motor to rotate, the prism is adjusted to a suitable angle, which reflects the laser beam emitted by the laser diode onto the BD sensor, thereby enabling the BD sensor to output the horizontal synchronization pulse signal.

[0075] In this system, before the laser diode illuminates the prism, it generates a laser emission signal. The laser diode is then controlled to emit a laser beam based on this signal, thus controlling the emission and shutdown of the laser beam. The laser emission signal indicates the on or off state of the laser diode. In one feasible implementation, a falling edge of the laser emission signal indicates that the laser diode is emitting a laser beam, and the emission stops when a rising edge appears after the falling edge of the signal, thus shutting down the laser beam emission.

[0076] S202, using the second pulse width of the correction line synchronization signal of the LSU in correction mode (second operation mode), calculate the pulse width compensation value of the first pulse width.

[0077] Specifically, in one feasible implementation, a pre-stored second pulse width W2 and a measured first pulse width W1 are retrieved. The difference between the first pulse width W1 and the second pulse width W2 is taken to determine the pulse width compensation value. Generally, half of the difference between the first pulse width W1 and the second pulse width W2 is used as the pulse width compensation value, that is, (W2-W1) / 2 is used as the pulse width compensation value. It is understood that the pulse width compensation value can also be the difference between the first pulse width W1 and the second pulse width W2, or a percentage of the difference.

[0078] In another feasible implementation, the second pulse width is the second pulse width of the detected LSU's line synchronization signal in the second operating mode. Specifically, when the image forming apparatus replaces a new LSU, the LSU is controlled to enter the second operating mode, where a laser beam is output at standard optical power to illuminate the BD sensor. The BD sensor corrects the line synchronization signal based on the laser output. After the corrected line synchronization signal stabilizes, the second pulse width W2 of the corrected line synchronization pulse signal is determined based on its falling edge and rising edge. After determining the second pulse width, it is stored for use in subsequent image forming tasks for correction.

[0079] S203, after compensating the line synchronization signal in normal operation mode with pulse width compensation value, performs the operation.

[0080] Specifically, the first operation time P1 is determined by the falling edge of the first pulse width, and the second operation time P2 is obtained by compensating the first operation time with the pulse width compensation value. The scanning operation is then performed based on the second operation time P2.

[0081] Once the scanning timing is determined, i.e., the second working time P2, the LSU motor is driven to rotate, and the prism is adjusted to a suitable angle so that the laser emitted by the laser diode can be reflected to the photosensitive component, which is then scanned to form an electrostatic latent image on the photosensitive component.

[0082] The second working time, P2 = P1 + (W2 - W1) / 2, is obtained by adding the first working time P1 to the pulse width compensation value (W2 - W1) / 2. The second working time is used as the timing for LSU scanning of the photosensitive element, and the scanning of the photosensitive element and subsequent image formation steps are performed.

[0083] S201-S203 is the process of compensating and correcting a group of LSUs. If there are multiple groups of LSUs, in order to ensure that each group of LSUs has the same working time, it is also necessary to perform S201-S203 on the remaining groups of LSUs through the second pulse width to perform compensation and correction.

[0084] In this embodiment of the invention, the second pulse width W2 of the laser output by the LSU in the second working mode is pre-acquired. Using the second pulse width W2 as a reference, the first pulse width of the laser output by each LSU in the first working mode is compensated and corrected. The appearance time of the falling edge in the first pulse width of the laser output by each LSU is unified, thereby realizing the correction of the color registration timing of the image.

[0085] In one specific embodiment, see Figure 4 When the LSU is initially installed, in the second operating mode, the LSU emits a laser beam that illuminates the BD sensor, and the LSU BD sensor outputs a horizontal sync signal 2. Because the laser intensity is weak, the BD sensor detects the laser emitted by the LSU at position B, resulting in a delayed falling edge in the horizontal sync signal 2. The second pulse width W2 is determined based on the horizontal sync signal 2 and stored.

[0086] In the first operating mode, the LSU emits a laser beam that illuminates the LSU BD sensor, which then outputs a horizontal sync signal 1. Due to the high sensitivity of the LSU BD sensor, the laser beam emitted by the LSU will be detected at position A earlier, causing the falling edge of the horizontal sync signal 1 to appear earlier. The first pulse width W1 is determined based on the horizontal sync signal 1, and the first operating time P1 is determined based on the falling edge of the horizontal sync signal 1.

[0087] The stored second pulse width W2 is retrieved. Based on the first pulse width W1 and the second pulse width W2, the pulse width compensation value (W2-W1) / 2 is calculated. The pulse width compensation value is used to compensate the line synchronization signal 1 in the first operation mode, that is, to compensate the first operation time P1, to obtain the second operation time P2. P2 = P1 + (W2-W1) / 2.

[0088] See Figure 4 The pulse width compensation value (W2-W1) / 2 is half the difference between the first pulse width W1 and the second pulse width W2. Specifically, it represents the difference between the first and second pulse widths on the left half, i.e., the difference in the time between the appearance of the falling edge. The second operation time P2 obtained after compensating the first operation time P1 with the pulse width compensation value is exactly the operation time determined based on the falling edge of the line synchronization signal 2, i.e., the operation time determined based on the laser output from the LSU in the second operation mode.

[0089] Similarly, the first pulse width W1 output by each of the other groups of LSUs in normal mode is corrected by the second pulse width W2, and the operating time of each group of LSUs is determined to be the same P2, thereby realizing the correction of the pulse width of the laser emitted by each LSU.

[0090] Corresponding to the laser scanning correction method described above, this embodiment of the invention also provides a laser scanning correction device. See [link to related document]. Figure 5 This is a schematic diagram of a laser scanning correction device provided in an embodiment of the present invention. Figure 5 As shown, the device may include: a detection module 510, a calculation module 520, and an operation module 530.

[0091] Detection module 510 detects the first pulse width of the line synchronization signal of the laser scanning unit LSU in the first operating mode;

[0092] The calculation module 520 uses the second pulse width of the correction line synchronization signal of the LSU in the second operating mode to calculate the pulse width compensation value of the first pulse width.

[0093] The operation module 530 performs the operation after compensating the line synchronization signal in the first operation mode with the pulse width compensation value.

[0094] See Figure 6 This is a schematic diagram of the specific structure of a laser scanning correction device provided in an embodiment of the present invention. Figure 5 In the laser scanning correction device shown, the detection module 510 further includes a transmission module 511, an acquisition module 512, and a first determination module 513. The transmission module 5111 further includes a rotation module 5111, and the operation module 530 further includes a second determination module 531, a compensation module 532, and a scanning module 533.

[0095] Figure 5 and Figure 6 The laser scanning correction device provided in the illustrated embodiment can be used to execute the technical solutions of the method embodiments shown in this specification. Its implementation principle and technical effects can be further referred to the relevant descriptions in the method embodiments.

[0096] Figure 7 This is a schematic diagram illustrating the structure of one embodiment of the laser scanning correction device described in this specification. The laser scanning correction device can be implemented as the image forming apparatus in the embodiments of this invention. The image forming apparatus is a device having at least one function related to image forming, which may include, but is not limited to: printing, scanning, copying, and faxing functions. Figure 7 As shown, the laser scanning correction device may include at least one processor; and at least one memory communicatively connected to the processing unit, wherein the memory stores program instructions executable by the processing unit, and the processor can execute the laser scanning correction method provided in this embodiment by calling the program instructions.

[0097] also, Figure 7 This specification also provides a schematic diagram of the structure of an embodiment of the electronic device described herein. The electronic device may include at least one processor and at least one memory communicatively connected to the processing unit. The memory stores program instructions executable by the processing unit, and the processor, by calling these program instructions, can execute the laser scanning correction method provided in this embodiment. The electronic device may be a device capable of intelligent dialogue with a user. This specification does not limit the specific form of the electronic device in its embodiments. It is understood that the electronic device referred to here is the machine mentioned in the method embodiments.

[0098] Figure 7 A block diagram of an exemplary electronic device suitable for implementing embodiments of this specification is shown. Figure 7 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments described in this specification.

[0099] like Figure 7As shown, the electronic device is represented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: one or more processors 710, communication interface 720, memory 730, and communication bus 740 connecting different system components (including memory 730, communication interface 720 and processor 710).

[0100] The communication bus 740 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. For example, these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0101] Electronic devices typically include a variety of computer-readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, and removable and non-removable media.

[0102] Memory 730 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. Memory 730 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments described herein.

[0103] A program / utility having a set (at least one) of program modules may be stored in memory 730. Such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. The program modules typically perform the functions and / or methods described in the embodiments of this specification.

[0104] The processor 710 executes various functional applications and data processing by running programs stored in the memory 730, such as implementing the laser scanning correction method provided in the embodiments shown in this specification.

[0105] This specification provides a non-transitory computer-readable storage medium that stores computer instructions that cause the computer to execute the laser scanning correction method provided in the embodiments shown in this specification.

[0106] The aforementioned non-transitory computer-readable storage medium may be any combination of one or more computer-readable media. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or flash memory, optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in connection with an instruction execution system, apparatus, or device.

[0107] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0108] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0109] Computer program code for performing the operations described herein can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0110] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0111] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0112] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this specification includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which the embodiments of this specification pertain.

[0113] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0114] It should be noted that the terminals involved in the embodiments of this specification may include, but are not limited to, personal computers (hereinafter referred to as PCs), personal digital assistants (hereinafter referred to as PDAs), wireless handheld devices, tablet computers, mobile phones, MP3 players, MP4 players, etc.

[0115] In the embodiments provided in this specification, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0116] Furthermore, the functional units in the various embodiments of this specification can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0117] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this specification.

[0118] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A laser scanning correction method, characterized by, The method is applied to a control component of an image forming apparatus, and the method includes: The first pulse width of the line synchronization signal of the laser scanning unit (LSU) in the first operating mode is detected; Using the second pulse width of the correction line synchronization signal of the laser scanning unit LSU in the second operating mode, the pulse width compensation value of the first pulse width is calculated; The operation is performed after the line synchronization signal in the first operation mode is compensated using the pulse width compensation value; The first operating mode is a normal operating mode, and the second operating mode is a calibration operating mode. The detection of the first pulse width of the line synchronization signal of the laser scanning unit (LSU) in the first operating mode includes: The laser diode is controlled to emit a laser beam based on the laser emission signal; The LSU is controlled to emit a laser beam to the laser diode BD sensor through the laser diode, and the BD sensor outputs the line synchronization signal when it receives the laser beam at its input terminal. Acquire the line synchronization signal output by the BD sensor; The first pulse width of the line synchronization signal in the first operating mode is determined based on the falling edge and the rising edge of the line synchronization signal. The step of compensating the line synchronization signal in the first operating mode using the pulse width compensation value includes: adjusting the scanning time of the laser scanning unit (LSU) scanning the photosensitive component in the first operating mode based on the pulse width compensation value, so that the adjusted scanning time is the operating time determined according to the falling edge of the second pulse width.

2. The method of claim 1, wherein, The control of the LSU to emit a laser beam to the BD sensor via the laser diode includes: The LSU drives the LSU motor to rotate, thereby adjusting the prism mounted on the LSU motor to a suitable angle; The laser beam emitted by the laser diode is reflected to the BD sensor through the prism.

3. The method of claim 1, wherein, The second pulse width includes: Before the LSU performs its first laser scan, the LSU is controlled to output a calibration line synchronization signal at standard optical power; The second pulse width of the correction line synchronization signal is determined based on the falling edge and rising edge of the correction line synchronization signal.

4. The method of claim 1, wherein, The step of calculating the pulse width compensation value of the first pulse width using the second pulse width of the corrected line synchronization signal of the LSU in the second operating mode includes: The pulse width compensation value is determined by the difference between the first pulse width and the second pulse width.

5. The method of claim 1, wherein, The step of compensating the line synchronization signal in the first operating mode with the pulse width compensation value before executing the operation includes: The first operation time is determined by the falling edge of the first pulse width of the line synchronization signal; The second operation time is obtained by compensating the first operation time with the pulse width compensation value. The scanning job is performed based on the second job time.

6. A laser scanning correction device, characterized by include: The detection module detects the first pulse width of the line synchronization signal of the laser scanning unit (LSU) in the first operating mode; The calculation module uses the second pulse width of the correction line synchronization signal of the LSU in the second operating mode to calculate the pulse width compensation value of the first pulse width; The operation module uses the pulse width compensation value to compensate the line synchronization signal in the first operation mode before performing the operation; The detection module further includes: The transmitting module controls the laser diode to emit a laser beam according to the laser emission signal, and controls the LSU to emit a laser beam to the laser diode BD sensor through the laser diode. When the input terminal of the BD sensor receives the laser beam, it outputs the line synchronization signal. The acquisition module acquires the line synchronization signal output by the BD sensor; The first determining module determines the first pulse width of the line synchronization signal in the first operating mode based on the falling edge and the rising edge of the line synchronization signal; The operation module, by using the pulse width compensation value to compensate the line synchronization signal in the first operation mode, includes: adjusting the scanning time of the laser scanning unit (LSU) scanning the photosensitive component in the first operation mode based on the pulse width compensation value, so that the adjusted scanning time is the operation time determined according to the falling edge of the second pulse width.

7. The apparatus of claim 6, wherein, The transmitting module includes: The rotation module controls the LSU to drive the LSU motor to rotate, thereby adjusting the prism mounted on the LSU motor to a suitable angle, and reflecting the laser beam emitted by the laser diode to the BD sensor through the prism.

8. The apparatus according to claim 6, characterized in that, The detection module is further configured to detect the second pulse width, including: Before the LSU performs its first laser scan, the LSU is controlled to output a calibration line synchronization signal at standard optical power; The second pulse width of the correction line synchronization signal is determined based on the falling edge and rising edge of the correction line synchronization signal.

9. The apparatus according to claim 6, characterized in that, The computing module includes: The pulse width compensation value is determined by the difference between the first pulse width and the second pulse width.

10. The apparatus according to claim 6, characterized in that, The operation module also includes: The second determining module determines the first operation time by the falling edge of the first pulse width of the line synchronization signal; The compensation module compensates the first operation time using the pulse width compensation value to obtain the second operation time; The scanning module performs a scanning job based on the second job time.

11. A laser scanning correction device, characterized in that, include: At least one processor; as well as At least one memory communicatively connected to the processor, wherein: The memory stores program instructions that can be executed by the processor, and the processor can invoke the program instructions to perform the method as described in any one of claims 1 to 5.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes 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 of any one of claims 1 to 5.

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