A timing control method and device of a laser scanning unit and an image forming apparatus

Abstract

Embodiments of the present application provide a timing control method and device of a laser scanning unit and an image forming device. The method comprises: starting a laser scanning unit motor, controlling a laser diode to emit light through an automatic power control signal, and controlling the laser diode to not emit light when a line synchronization signal is detected; predicting a time when a next line synchronization signal is generated through a position signal used to indicate a position of the laser scanning unit motor, and driving the laser diode to emit light in advance to generate the next line synchronization signal, and triggering initialization of the laser scanning unit with the next line synchronization signal. By driving the LD to emit light to detect the line synchronization signal when starting the LSU motor, and predicting the time when the next line synchronization signal is generated, the LD is driven to emit light in advance before the next line synchronization signal is sent, so that the time when each line synchronization signal is sent can be accurately determined without waiting for the LSU motor to rotate stably, the printing time of a first page can be shortened, and the printing efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of image forming, in particular to a timing control method and device of a laser scanning unit and an image forming device. BACKGROUND

[0002] A laser scanning unit (LSU) of an image forming device is configured with a laser diode (LD) driving chip, which is used to convert a signal output by a system on chip (SoC) into a corresponding modulation signal to drive a laser to emit light. However, in the control timing of the existing LSU, the LD driving chip is started to drive the LD to emit light to generate a stable line synchronization signal only after the LSU motor is stable (uniformly rotates), and then the automatic power control (APC) signal is controlled through the stable line synchronization signal to perform the initialization timing of the LD driving chip. However, the above-mentioned method needs to generate a stable line synchronization signal after the LSU motor is stable, which results in a long start-up time of the LSU and prolongs the printing time of the first page of each print. SUMMARY

[0003] Therefore, the embodiments of the present application provide a timing control method and device of a laser scanning unit and an image forming device to shorten the printing time of the first page and improve the printing efficiency.

[0004] In one aspect, the embodiments of the present application provide a timing control method of a laser scanning unit, which is executed in an image forming device, and includes the following steps.

[0005] starting a laser scanning unit motor, controlling a laser diode to emit light through an automatic power control signal, and controlling the laser diode not to emit light when a line synchronization signal is detected.

[0006] predicting a time point of generation of a next line synchronization signal through a position signal used to indicate a position of the laser scanning unit motor, driving the laser diode to emit light in advance to generate the next line synchronization signal, and triggering the initialization of the laser scanning unit through the next line synchronization signal.

[0007] Optionally, the position signal used to indicate the position of the laser scanning unit motor includes an encoder signal, the encoder signal is a plurality of pulse signals generated when the laser scanning unit motor rotates, and the current position of the laser scanning unit motor rotated to is inferred according to the encoder signal.

[0008] Optionally, the step of predicting the time point of generation of the next line synchronization signal through the position signal used to indicate the position of the laser scanning unit motor includes the following steps.

[0009] The time of generation of the next line synchronization signal is predicted by counting the number of pulse signals generated in the interval time between the detected current line synchronization signal and the next line synchronization signal.

[0010] Optionally, the time of generation of the next line synchronization signal is predicted by counting the number of pulse signals generated in the interval time between the detected current line synchronization signal and the next line synchronization signal, comprising:

[0011] When the current line synchronization signal is detected, the number of pulse signals corresponding to the position signal is counted to generate a pulse number.

[0012] When the pulse number is a set threshold value, it is predicted that the next line synchronization signal will be generated.

[0013] Optionally, the initialization timing of the laser diode is performed through the line synchronization signal.

[0014] Optionally, when the laser scanning unit motor is stably running, the initialization of the laser diode driver chip is completed, and the step of predicting the time of generation of the next line synchronization signal through the position signal for indicating the position of the laser scanning unit motor, driving the laser diode to emit light in advance to generate the next line synchronization signal, and triggering the initialization of the laser scanning unit with the next line synchronization signal is continued.

[0015] Optionally, the encoder signal is generated when the motor encoder detects that the laser scanning unit motor runs to a specified position.

[0016] In another aspect, an embodiment of the present application provides a timing control device of a laser scanning unit, comprising:

[0017] A control module is configured to start the laser scanning unit motor, control the laser diode to emit light through an automatic power control signal, and control the laser diode not to emit light when the line synchronization signal is detected.

[0018] A driving module is configured to predict the time of generation of the next line synchronization signal through the position signal for indicating the position of the laser scanning unit motor, drive the laser diode to emit light in advance to generate the next line synchronization signal, and trigger the initialization of the laser scanning unit with the next line synchronization signal.

[0019] In another aspect, an embodiment of the present application provides a computer readable storage medium, wherein the storage medium comprises a stored program, and when the program is running, the device where the storage medium is located performs the timing control method of the laser scanning unit.

[0020] In another aspect, an image forming apparatus is provided, which includes a memory for storing information including program instructions, and a processor for controlling execution of the program instructions, wherein the program instructions, when loaded and executed by the processor, implement the steps of the timing control method of the laser scanning unit.

[0021] In the timing control method of the laser scanning unit, the laser scanning unit motor is started, the laser diode is controlled to emit light by an automatic power control signal, and when a line synchronization signal is detected, the laser diode is controlled not to emit light. The time of generation of the next line synchronization signal is predicted by a position signal for indicating the position of the laser scanning unit motor, and the laser diode is driven to emit light in advance to generate the next line synchronization signal, and the initialization of the laser scanning unit is triggered by the next line synchronization signal. By driving the LD to emit light to detect the line synchronization signal when the LSU motor is started, and predicting the generation time of the next line synchronization signal, the LD is driven in advance before the next line synchronization signal is sent, and the time of sending of each line synchronization signal can be accurately determined without waiting for the LSU motor to rotate stably, the printing time of the first page can be shortened, and the printing efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 A timing control method of a laser scanning unit provided by the related art is shown in the figure;

[0024] Figure 2 A flowchart of a timing control method of a laser scanning unit provided by an embodiment of the present application is shown in the figure;

[0025] Figure 3 A timing control method of a laser scanning unit provided by an embodiment of the present application is shown in the figure;

[0026] Figure 4 A flowchart of predicting the time of generation of the next line synchronization signal by a position signal for indicating the position of the laser scanning unit motor provided by an embodiment of the present application is shown in the figure;

[0027] Figure 5 A structural schematic diagram of a timing control device of a laser scanning unit provided by an embodiment of the present application is shown in the figure;

[0028] Figure 6A schematic view of an image forming device is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0030] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0031] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0032] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0033] The LSU is usually provided on the image forming device. Through the LSU, the photosensitive drum (image carrier) which has been uniformly charged can be exposed, so that the surface charge of the photosensitive drum disappears relative to the places where the original has image area, thereby forming an image in the form of charge on the surface of the photosensitive drum, called "electrostatic latent image".

[0034] The Laser Diode Driver (LDD) chip is a core component for driving the LSU, and is also one of the core components of the printer. It is mainly used to convert the signal output by the printer SoC into a corresponding modulation signal to drive the laser to emit light.

[0035] The LSU motor is generally configured with a motor encoder. The LSU motor belongs to an execution element, and the motor encoder belongs to a feedback system. The motor encoder is used in cooperation with the LSU motor, and a control system controls the operation thereof. The control system sends pulse instructions to the motor driver, and the motor driver provides corresponding current to the LSU motor to make the LSU motor run. When the motor encoder detects that the LSU motor runs to the required position, it feeds back a position signal to the control system. The motor encoder is used to feed back the position of the rotation of the LSU motor to the control system to adjust the angle of rotation of the LSU motor.

[0036] The related technology provides a timing control method of a laser scanning unit, Figure 1 A flow chart of the timing control method of the laser scanning unit provided by the related technology is shown in FIG. Figure 1 As shown in the figure, when the LSU motor is stable, the LD driving chip is started to drive the LD to emit light to generate a stable line synchronization signal, and then the APC signal is controlled through the stable line synchronization signal to perform the initialization timing of the LD driving chip, which causes the LSU start time to be lengthened.

[0037] In addition, when the LSU motor is stable (when the LSU motor is stable, the rotation speed of the LSU motor becomes uniform, and whether the LSU motor is stable can be determined by determining the rotation speed of the LSU motor), if a fixed time is used to predict the position of the motor rotation to start the LD to emit light in advance to generate the line synchronization signal, when the motor speed suddenly changes, the line synchronization signal generation will be abnormal.

[0038] To solve the technical problems in the related technology, an embodiment of the present application provides a timing control method of a laser scanning unit, Figure 2 A flow chart of the timing control method of the laser scanning unit provided by the embodiment of the present application is shown in FIG. Figure 3 A flow chart of the timing control method of the laser scanning unit provided by the embodiment of the present application is shown in FIG. Figure 2 Or Figure 3 The method comprises the following steps:

[0039] Step 102, start the laser scanning unit motor, control the laser diode to emit light through the automatic power control signal, and control the laser diode not to emit light when the line synchronization signal is detected.

[0040] In the embodiment of the present application, each step is executed by an image forming device, which includes but is not limited to a printer, a copier, a fax machine, a scanner, and a multifunctional machine integrating the functions of printing, copying, faxing, and scanning, etc., and its function is to print images or characters on an imaging medium.

[0041] In the embodiment of the present application, step 102 is executed when the initialization of the LSU is performed.

[0042] In the embodiment of the present application, the APC signal is controlled to be at a low level, the LD driving chip is started, and the laser diode is driven to emit light.

[0043] Step 103, predicting the time of generation of the next line synchronization signal through the position signal for indicating the position of the laser scanning unit motor, driving the laser diode to emit light in advance to generate the next line synchronization signal, and triggering the initialization of the laser scanning unit with the next line synchronization signal.

[0044] In an embodiment of the present application, the position signal for indicating the position of the laser scanning unit motor comprises an encoder signal, and the encoder signal is a plurality of pulse signals generated when the laser scanning unit motor rotates, and the current position of the laser scanning unit motor can be inferred according to the encoder signal.

[0045] In an embodiment of the present application, a motor encoder is arranged in the image forming device, and the encoder signal is generated when the motor encoder detects that the laser scanning unit motor runs to a specified position.

[0046] Specifically, the time of generation of the next line synchronization signal is predicted by calculating the number of pulse signals generated in the interval time between the current line synchronization signal and the next line synchronization signal.

[0047] Figure 4 A flow chart for predicting the time of generation of the next line synchronization signal through the position signal for indicating the position of the laser scanning unit motor is provided in an embodiment of the present application, as shown in Figure 4 Step 103 specifically comprises:

[0048] S1, when the current line synchronization signal is detected, counting the number of pulse signals corresponding to the position signal, and generating the pulse number.

[0049] For example, if 10,000 pulse signals are generated when the LSU motor rotates one circle, 5,000 pulse signals are generated when the LSU motor rotates half a circle, and every 5,000 pulse signals represent that the LSU motor rotates half a circle, i.e., the position of the laser scanning unit motor can be inferred.

[0050] S2, when the pulse number is a set threshold value, it is predicted that the next line synchronization signal will be generated.

[0051] In an embodiment of the present application, the set threshold value can be set according to the actual situation.

[0052] In an embodiment of the present application, when the pulse number is n, it is predicted that the next line synchronization signal will be generated, and the LD is driven to emit light in advance before the next line synchronization signal is sent, without waiting for the LSU motor to be stable before driving the LD to emit light, so that the time of sending each line synchronization signal can be accurately determined according to the encoder signal, thereby controlling the LD to emit light.

[0053] In an embodiment of the present application, through the above steps, the line synchronization signal can be generated cyclically before the LSU motor is stabilized, and the initialization timing of the laser diode is performed through the line synchronization signal. When the laser scanning unit motor is in stable operation, the initialization of the LDD chip is completed, and step 103 is performed continuously.

[0054] In the technical solution provided by the embodiment of the present application, the laser scanning unit motor is started, the laser diode is controlled to emit light through the automatic power control signal, the laser diode is controlled not to emit light when the line synchronization signal is detected, the time of generation of the next line synchronization signal is predicted through the position signal used for indicating the position of the laser scanning unit motor, the laser diode is driven to emit light in advance to generate the next line synchronization signal, and the initialization of the laser scanning unit is triggered by the next line synchronization signal. Through the above steps, the LD is driven to emit light to detect the line synchronization signal when the LSU motor is started, the generation time of the next line synchronization signal is predicted, and the LD is driven to emit light in advance before the next line synchronization signal is sent. Therefore, the time of sending each line synchronization signal can be accurately determined without waiting for the LSU motor to be in stable rotation, the printing time of the first page can be shortened, and the printing efficiency is improved.

[0055] In an embodiment of the present application, the printing time of the first page before each printing (the printing time of the first page will be reduced when different printing jobs are sent and the printer is restarted) is reduced by about tens of milliseconds. Meanwhile, the high-voltage timing of the high-voltage plate can be controlled in advance through the above steps, and the time of high-voltage timing control and LSU initialization of the image forming device is saved.

[0056] In the technical solution provided by the embodiment of the present application, in order to solve the problem that the LSU motor needs to be stabilized before a stable line synchronization signal is generated in the related art, the starting time of the LSU is long, and the printing time of the first page is prolonged, an embodiment of the present application drives the LD to emit light to detect the line synchronization signal when the LSU motor is started, predicts the generation time of the next line synchronization signal through the pulse signal sent by the encoder, and drives the LD to emit light in advance before the next line synchronization signal is sent. Therefore, the time of sending each line synchronization signal can be accurately determined according to the signal fed back by the encoder without waiting for the motor to be in stable rotation, and the effect of controlling the LD to emit light is achieved.

[0057] In the technical solution provided by the embodiment of the present application, the initialization timing of the LD driving chip can be advanced, and the printing time of the first page can be advanced.

[0058] In the technical solution provided by the embodiment of the present application, the position information can be used to predict and control the generation of the next line synchronization signal, and the motor speed fluctuation has no effect.

[0059] An embodiment of the present application provides a timing control device of a laser scanning unit. Figure 5A structural schematic diagram of a timing control device of a laser scanning unit according to an embodiment of the present application is shown in Figure 5 The device comprises a control module 11 and a driving module 12.

[0060] The control module 11 is configured to start the laser scanning unit motor, control the laser diode to emit light through an automatic power control signal, and control the laser diode to not emit light when a line synchronization signal is detected.

[0061] The driving module 12 is configured to predict the time when the next line synchronization signal is generated through a position signal indicating the position of the laser scanning unit motor, drive the laser diode to emit light in advance to generate the next line synchronization signal, and trigger the initialization of the laser scanning unit with the next line synchronization signal.

[0062] In an embodiment of the present application, the position signal indicating the position of the laser scanning unit motor comprises an encoder signal, the encoder signal is a plurality of pulse signals generated when the laser scanning unit motor rotates, and the current position of the laser scanning unit motor to which the laser scanning unit motor rotates is inferred according to the encoder signal.

[0063] In an embodiment of the present application, the driving module 12 is specifically configured to predict the time when the next line synchronization signal is generated by counting the number of pulse signals generated in the interval time between the current line synchronization signal and the next line synchronization signal.

[0064] In an embodiment of the present application, the driving module 12 is specifically configured to count the number of pulse signals corresponding to the position signal when the current line synchronization signal is detected to generate the number of pulses, and predict that the next line synchronization signal is about to be generated when the number of pulses is a set threshold.

[0065] In an embodiment of the present application, the initialization timing of the laser diode is performed through the line synchronization signal.

[0066] In an embodiment of the present application, when the laser scanning unit motor is stably running, the initialization of the laser diode driver chip is completed, and the driving module 12 continues to perform the steps of predicting the time when the next line synchronization signal is generated through the position signal indicating the position of the laser scanning unit motor, driving the laser diode to emit light in advance to generate the next line synchronization signal, and triggering the initialization of the laser scanning unit with the next line synchronization signal.

[0067] In an embodiment of the present application, the encoder signal is generated when the motor encoder detects that the laser scanning unit motor runs to a specified position.

[0068] In the technical solution provided by an embodiment of the present invention, the laser scanning unit motor is started, and the laser diode is controlled to emit light via an automatic power control signal. When a horizontal synchronization signal is detected, the laser diode is controlled to not emit light. The time when the next horizontal synchronization signal is generated is predicted using a position signal indicating the position of the laser scanning unit motor, and the laser diode is driven to emit light in advance to generate the next horizontal synchronization signal. The next horizontal synchronization signal is then used to trigger the initialization of the laser scanning unit. By driving the LD to emit light to detect the horizontal synchronization signal when the LSU motor is started, and then predicting the generation time of the next horizontal synchronization signal, the LD is driven to emit light in advance before the next horizontal synchronization signal is sent. This allows the timing of each horizontal synchronization signal to be accurately determined without waiting for the LSU motor to stabilize its rotation, thereby shortening the printing time of the first page and improving printing efficiency.

[0069] The timing control device of the laser scanning unit provided in this embodiment can be used to achieve the above Figure 2 The timing control method of the laser scanning unit in the embodiment of the timing control method of the laser scanning unit can be described in detail, and will not be repeated here.

[0070] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the embodiment of the timing control method of the above-mentioned laser scanning unit. For a specific description, please refer to the embodiment of the timing control method of the above-mentioned laser scanning unit.

[0071] An embodiment of the present invention provides an image forming device, including a memory and a processor, the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions. When the program instructions are loaded and executed by the processor, the steps of the embodiment of the timing control method of the above-mentioned laser scanning unit are implemented. For a specific description, please refer to the embodiment of the timing control method of the above-mentioned laser scanning unit.

[0072] Figure 6 Schematic diagram of an image forming device provided by an embodiment of the present invention. Figure 6 As shown, the image forming device 20 of this embodiment includes: a processor 21, a memory 22, and a computer program 23 stored in the memory 22 and executable on the processor 21. When executed by the processor 21, the computer program 23 implements the timing control method for the laser scanning unit of the embodiment. To avoid repetition, a detailed description is not given here. Alternatively, when executed by the processor 21, the computer program implements the functions of each model / unit in the timing control device for the laser scanning unit of the embodiment. To avoid repetition, a detailed description is not given here.

[0073] The image forming device 20 includes, but is not limited to, a processor 21 and a memory 22. Those skilled in the art will understand thatFigure 6 The image forming apparatus 20 is merely an example and does not limit the image forming apparatus 20, and can include more or less components than illustrated, or combine certain components, or different components, for example, the image forming apparatus can also include an input / output device, a network access device, a bus, etc.

[0074] The processor 21 can be a central processing unit (CPU), and can also be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0075] The memory 22 can be an internal storage unit of the image forming apparatus 20, for example, a hard disk or a memory of the image forming apparatus 20. The memory 22 can also be an external storage device of the image forming apparatus 20, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 22 can include both the internal storage unit and the external storage device of the image forming apparatus 20. The memory 22 is used to store computer programs and other programs and data required by the image forming apparatus. The memory 22 can also be used to temporarily store data that has been output or will be output.

[0076] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, apparatus and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0077] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic. For example, the division of the units is only a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, or the among different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0078] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. In actual implementation, some or all of the units can be selected according to the actual needs to achieve the purposes of the embodiments.

[0079] In addition, each function unit in the various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of hardware plus software function units.

[0080] The integrated unit implemented in the form of software function units can be stored in a computer readable storage medium. The above-mentioned software function unit stored in a storage medium includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute some steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes a variety of storage media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0081] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A timing control method for a laser scanning unit, executed in an image forming device, characterized in that: include: Start the laser scanning unit motor and control the laser diode to emit light through the automatic power control signal. When the horizontal synchronization signal is detected, the laser diode is controlled not to emit light. The moment when the next line synchronization signal is generated is predicted by the position signal used to indicate the position of the laser scanning unit motor, the laser diode is driven to emit light in advance to generate the next line synchronization signal, and the initialization of the laser scanning unit is triggered by the next line synchronization signal to cyclically generate the line synchronization signal before the laser scanning unit motor runs stably.

2. The method according to claim 1, characterized in that The position signal for indicating the position of the laser scanning unit motor includes an encoder signal. The encoder signal is a plurality of pulse signals generated when the laser scanning unit motor rotates. The current position to which the laser scanning unit motor rotates is estimated based on the encoder signal.

3. The method according to claim 2, characterized in that The method of predicting the time when the next line synchronization signal is generated by using the position signal indicating the position of the laser scanning unit motor includes: The time when the next horizontal synchronization signal is generated is predicted by calculating the number of pulse signals generated in the interval time between the current horizontal synchronization signal and the next horizontal synchronization signal.

4. The method according to claim 3, characterized in that The method of predicting the time when the next horizontal synchronization signal is generated by calculating the number of pulse signals generated in the interval between the current horizontal synchronization signal and the next horizontal synchronization signal detected includes: When the current line synchronization signal is detected, the number of pulse signals corresponding to the position signal is counted to generate a pulse count; When the number of pulses reaches a set threshold, it is predicted that the next horizontal synchronization signal is about to be generated.

5. The method according to claim 1, wherein The laser diode is initialized by the horizontal synchronization signal.

6. The method according to claim 5, characterized in that When the laser scanning unit motor is running stably, the initialization of the laser diode driver chip is completed, and the steps of predicting the time when the next line synchronization signal is generated by the position signal indicating the position of the laser scanning unit motor, driving the laser diode to emit light in advance to generate the next line synchronization signal, and triggering the initialization of the laser scanning unit with the next line synchronization signal are continued.

7. The method according to claim 2, characterized in that When the motor encoder detects that the laser scanning unit motor moves to a specified position, the encoder signal is generated.

8. A timing control device for a laser scanning unit, characterized in that: include: The control module is used to start the laser scanning unit motor, control the laser diode to emit light through the automatic power control signal, and control the laser diode to not emit light when the horizontal synchronization signal is detected; A driving module is used to predict the time when the next line synchronization signal is generated by using a position signal indicating the position of the laser scanning unit motor, drive the laser diode to emit light in advance to generate the next line synchronization signal, and trigger the initialization of the laser scanning unit with the next line synchronization signal to cyclically generate the line synchronization signal before the laser scanning unit motor runs stably.

9. A computer-readable storage medium, characterized in that include: The storage medium includes a stored program, wherein when the program is run, the device where the storage medium is located is controlled to execute the timing control method of the laser scanning unit according to any one of claims 1 to 7.

10. An image forming apparatus comprising a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions, wherein: When the program instructions are loaded and executed by the processor, the steps of the timing control method of the laser scanning unit according to any one of claims 1 to 7 are implemented.

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