Image forming device and detection method of laser scanning unit

Abstract

The present invention provides an image forming device and a method for detecting a laser scanning unit, comprising a trusted computing supervisory unit, an imaging control unit, and a laser scanning unit. The trusted computing supervisory unit or the imaging control unit is configured to obtain parameters of the laser scanning unit. The trusted computing supervisory unit or the imaging control unit is configured to measure the parameters of the laser scanning unit based on a preset algorithm and generate a target measurement value. The trusted computing supervisory unit is configured to compare the target measurement value with a preset measurement value, generate a comparison result, and determine whether the laser scanning unit is trustworthy based on the comparison result. The above-mentioned image forming device can effectively detect whether the laser scanning unit meets the requirements, prevent the non-compliant laser scanning unit from continuing to operate, ensure the safety of the components within the image forming device, and ensure that the image forming device forms an effective and reliable image.

Description

Technical field

[0001] The present invention relates to the field of image forming technology, and in particular to an image forming device and a detection method for a laser scanning unit. [Background Technology]

[0002] An image forming device typically includes an imaging control unit, a laser scanning unit (LSU), and a photosensitive drum. The imaging control unit controls the laser scanning unit to scan the surface of the photosensitive drum, thereby controlling image formation. Therefore, as a key component of the image forming device, the reliability of the laser scanning unit is crucial to image quality. Installing an LSU that does not meet the requirements may affect image quality and, in worse cases, damage components within the device, causing inconvenience to the user.

[0003] However, the prior art lacks a detection solution capable of detecting whether the LSU installed on the image forming apparatus meets the requirements. [Summary of the invention]

[0004] In order to solve the problem in the prior art that there is a lack of a detection solution capable of detecting whether an LSU installed on an image forming device meets the requirements, the present invention provides an image forming device and a detection method for a laser scanning unit.

[0005] A method for detecting a laser scanning unit, applied to an image forming device, comprises:

[0006] Get the parameters of the laser scanning unit;

[0007] Measuring the parameters of the laser scanning unit based on a preset algorithm to generate a target measurement value;

[0008] Comparing the target metric value with a preset metric value to generate a comparison result;

[0009] Whether the laser scanning unit is credible is determined according to the comparison result.

[0010] Preferably, the parameters of the laser scanning unit include characteristic parameters of the laser scanning unit.

[0011] Preferably, the parameters of the laser scanning unit include one or more of initialization timing parameters, scanning timing parameters and printing timing parameters of the laser scanning unit.

[0012] Preferably, the parameters of the laser scanning unit include a time parameter and a distance parameter; the method further comprises:

[0013] The distance parameter is converted into a time parameter or the time parameter is converted into a distance parameter.

[0014] Preferably, the method further comprises:

[0015] When the laser scanning unit is untrustworthy, the laser scanning unit is controlled to stop running.

[0016] An image forming device includes a trusted computing supervision unit, an imaging control unit, and a laser scanning unit;

[0017] The trusted computing supervision unit or the imaging control unit is used to obtain parameters of the laser scanning unit;

[0018] The trusted computing supervision unit or the imaging control unit is used to measure the parameters of the laser scanning unit based on a preset algorithm to generate a target measurement value;

[0019] The trusted computing supervision unit is used to compare the target measurement value with a preset measurement value, generate a comparison result, and determine whether the laser scanning unit is trustworthy based on the comparison result.

[0020] Preferably, the parameters of the laser scanning unit include characteristic parameters of the laser scanning unit.

[0021] Preferably, the parameters of the laser scanning unit include one or more of initialization timing parameters, scanning timing parameters and printing timing parameters of the laser scanning unit.

[0022] Preferably, the parameters of the laser scanning unit include a time parameter and a distance parameter; the trusted computing supervision unit or the imaging control unit is further configured to convert the distance parameter into a time parameter or convert the time parameter into a distance parameter.

[0023] Preferably, when the laser scanning unit is untrustworthy, the imaging control unit is further configured to control the laser scanning unit to stop operating.

[0024] A computer-readable storage medium stores a computer program, which implements the above-mentioned detection method of the laser scanning unit when executed by a processor.

[0025] An image forming device, comprising:

[0026] A processor and a memory, wherein the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the detection method of the laser scanning unit as described above is implemented.

[0027] The detection method of the laser scanning unit provided in an embodiment of the present invention obtains the parameters of the laser scanning unit, measures the parameters of the laser scanning unit based on a preset algorithm, generates a target measurement value, compares the target measurement value with the preset measurement value, generates a comparison result, and judges whether the laser scanning unit is trustworthy based on the comparison result, thereby effectively detecting whether the laser scanning unit meets the requirements, preventing the laser scanning unit that does not meet the requirements from continuing to operate, and ensuring the safety of the components in the image forming device and the image forming device forming an effective and reliable image.

Brief Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic structural diagram of an image forming device according to an embodiment of the present application;

[0030] Figure 2 This is a schematic structural diagram of an image forming device in another embodiment of the present application;

[0031] Figure 3 This is a timing diagram of initialization of an image forming device according to an embodiment of the present application;

[0032] Figure 4 This is a scanning timing diagram of an image forming device in one embodiment of the present application;

[0033] Figure 5 Flowchart of a detection method of a laser scanning unit in one embodiment of the present application. [Specific implementation method]

[0034] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0036] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0037] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0038] Example 1

[0039] Please refer to Figure 1 This embodiment provides an image forming apparatus, including an imaging control unit 100, an LSU 200, and an organic photoconductor (OPC) 101a.

[0040] Among them, the image forming device is used to perform image forming jobs, such as generating, printing, receiving and sending image data, and examples of image forming devices include: inkjet printers, laser printers, LED (Light Emitting Diode) printers, copiers, scanners or multi-function all-in-one fax machines, and multi-function peripherals (MFPs) that perform the above functions in a single device.

[0041] The imaging control unit 100 is used to control the imaging processing operations of the image forming device. Specifically, the imaging control unit 100 is used to perform processing operations related to data reception and transmission, command reception and transmission, and engine control, for example, how to call the interface unit (including but not limited to USB port, wired network port, wireless network port, etc.) through the application to receive and send data, commands, status, etc., and can also obtain the received printing parameters through the application and parse them into commands for controlling the engine mechanism to perform specific functions, such as pickup roller rotation parameters, etc.; in addition, for image forming devices with user authority authentication or encryption / decryption processing functions, the imaging control unit 100 is also configured to be able to perform user authority authentication or encryption / decryption processing functions; and the interface unit in the image forming device can also receive print job data and print, scan, fax commands from the drive device, or send scan, fax data, print, scan, fax status information, etc. The photosensitive drum 101a is generally cylindrical, and the LSU200 can scan the surface of the photosensitive drum 101a along the main scanning direction and the sub-scanning direction, wherein the main scanning direction can be the axial direction of the photosensitive drum 101a (such as Figure 1 The sub-scanning direction may be the circumferential direction of the cross section of the photosensitive drum 101a (eg Figure 1 Direction A) shown in FIG.

[0042] exist Figure 1In the image processing unit 100, the LSU 200 may include a laser diode (LD) 201, an LD driver 2 for controlling the LD's light emission, a collimating lens 202, a grating 203, a cylindrical lens 204, a polygonal mirror 205, a curved lens 207, a diffractive optical element 208, a motor 206 for driving the polygonal mirror 205, and a motor driver 3 for controlling the motor 206. The LD driver 2 and the motor driver 3 are controlled by the imaging control unit 100. The polygonal mirror 205 includes multiple reflective surfaces. The laser beam emitted by the LD 201 passes through the collimating lens 202, the grating 203, and the cylindrical lens 204 in sequence, reaches a reflective surface of the polygonal mirror 205, is reflected by the reflective surface, and then passes through the curved lens 207 and the diffractive optical element 208 in sequence to reach the surface of the photosensitive drum 101a, forming an electrostatic latent image.

[0043] The collimating lens 202 can be used to convert the laser beam emitted by the LD 201 into parallel light, and the grating 203 can be used to limit the light flux of the laser beam. The cylindrical lens 204 has a specific refractive index in the sub-scanning direction, so that the light flux passing through the grating 203 forms an elliptical image on the reflection surface of the polygon mirror 205, with the major axis of the elliptical image located in the main scanning direction.

[0044] The polygon mirror 205 can be driven by the motor 206 to rotate in a specific direction, for example, Figure 1 As the polygon mirror 205 rotates, the incident angle of the laser beam on the reflecting surface of the polygon mirror 205 changes continuously. Correspondingly, the incident position of the light beam reflected from the reflecting surface of the polygon mirror 205 to the surface of the photosensitive drum 101a moves along the main scanning direction, thereby realizing scanning along the main scanning direction, i.e., line scanning. Figure 1 In the embodiment, each time the polygon mirror 205 rotates a reflecting surface, the laser beam can scan from one end of the photosensitive drum to the other end in the main scanning direction, that is, complete a line scan. In addition, the photosensitive drum 101a is rotated under the drive of a driving unit 211 so that the light beam can move in the sub-scanning direction.

[0045] LSU 200 may also include a beam detector 209 and a reflector 210. The reflector 210 is positioned to correspond to specific locations on each reflective surface of polygonal mirror 205. When a laser beam is incident on any reflective surface of polygonal mirror 205 at that specific location, the beam reflected by that reflective surface of polygonal mirror 205 is received by reflector 210. Reflector 210 then reflects the received beam to beam detector 209. Upon detecting the beam, beam detector 209 sends a start scan signal, typically referred to as a line synchronization signal, to imaging control unit 100.

[0046] Example 2

[0047] Please refer to Figure 2 The image forming apparatus also includes a trusted computing supervisory unit 300 for monitoring the corresponding operating activities of the imaging control unit 100 within the image forming apparatus. Trusted computing within the trusted computing supervisory module is designed for behavioral security and is widely used in computer and communication systems to enhance overall system security. Information security encompasses four aspects: device security, data security, content security, and behavioral security. To enhance the information security of the image forming apparatus, this embodiment introduces trusted computing functionality.

[0048] The trusted computing supervision unit 300 or the imaging control unit 100 is configured to obtain parameters of the laser scanning unit 200. The trusted computing supervision unit 300 or the imaging control unit 100 is configured to measure the parameters of the laser scanning unit 200 based on a preset algorithm and generate a target measurement value. The trusted computing supervision unit 300 is configured to compare the target measurement value with the preset measurement value, generate a comparison result, and determine whether the laser scanning unit 200 is trustworthy based on the comparison result.

[0049] The parameters of the laser scanning unit 200 can be obtained by the imaging control unit 100, or by the trusted computing supervision unit 300. When the parameters of the laser scanning unit 200 are obtained by the imaging control unit 100, the imaging control unit 100 is used to measure the parameters of the laser scanning unit 200 based on a preset algorithm to generate a target measurement value. When the parameters of the laser scanning unit 200 are obtained by the trusted computing supervision unit 300, the trusted computing supervision unit 300 is used to measure the parameters of the laser scanning unit 200 based on a preset algorithm to generate a target measurement value. When the parameters of the laser scanning unit 200 are obtained by the trusted computing supervision unit 300, the imaging control unit 100 can directly obtain the parameters of the laser scanning unit 200, and the trusted computing supervision unit 300 can then indirectly obtain the parameters of the laser scanning unit 200 through the imaging control unit 100.

[0050] The parameters of the laser scanning unit 200 may include characteristic parameters of the laser scanning unit 200. Before the laser scanning unit 200 is started, the trusted computing supervision unit 300 measures the characteristic parameters of the laser scanning unit 200. If the measurement result of the characteristic parameters of the laser scanning unit 200 is untrustworthy, the startup operation of the laser scanning unit 200 is not performed to avoid affecting the image formation quality of the image forming device or damaging components within the image forming device.

[0051] The characteristic parameters of the laser scanning unit 200 are inherent parameters of the laser scanning unit 200 and do not change regardless of whether the laser scanning unit 200 is activated or not. The characteristic parameters of the laser scanning unit 200 include first-category characteristic parameters and second-category characteristic parameters. The first-category characteristic parameters include LD type, resolution, number of motor mirrors, scan width, one-line scan angle, one-line effective scan angle, OPC linear speed, or other types of parameters. The second-category characteristic parameters include polygon mirror motor speed, one-line scan time, one-line effective scan utilization, one-line effective scan time, one pixel exposure time, image frequency (video), or other types of parameters.

[0052] The trusted computing supervision unit 300 may include a trusted chip, which is used to store preset measurement values. The preset algorithm may be a hash (hash function) algorithm or other algorithm. The use of a hash algorithm can improve the utilization of the storage space of the trusted computing supervision unit 300, improve the efficiency of data query, and also provide digital signatures to ensure the security of data transmission. Hash algorithms include MD5 (MD5 Message-Digest Algorithm) information digest algorithm, SHA-1 (Secure Hash Algorithm 1), RipeMD-160, SHA-256, SHA-512, etc.

[0053] The trusted computing supervision unit 300 can measure the characteristic parameters of the laser scanning unit 200 as a whole using a hash algorithm to obtain a first hash measurement value, and then compare the first hash measurement value with the first preset measurement value. The trusted computing supervision unit 300 can also measure some parameters in the characteristic parameters, and the partial parameters can be all parameters in the first characteristic parameters, some parameters in the first characteristic parameters, all parameters in the second characteristic parameters, some parameters in the second characteristic parameters, or a combination of some parameters in the first specific parameters and some parameters in the second characteristic parameters. The trusted computing supervision unit 300 measures some parameters in the above-mentioned characteristic parameters using a hash algorithm to obtain a second hash measurement value, and then compares the second hash measurement value with the second preset measurement value. It should be noted that when performing parameter measurement, at least two parameters are measured to obtain the measurement result.

[0054] In one application scenario, before the laser scanning unit 200 is started, the trusted computing supervision unit 300 obtains the characteristic parameters of the laser scanning unit 200. The trusted computing supervision unit 300 performs hash measurement on all the characteristic parameters of the laser scanning unit 200 based on the hash algorithm, generates a target measurement value, and stores the target measurement value in the trusted chip. When the trusted chip executes the trusted code, it compares the target measurement value with the preset measurement value to generate a comparison result. The trusted chip determines whether the laser scanning unit 200 is trustworthy based on the comparison result. When the target measurement value is consistent with the preset measurement value, the comparison result is trustworthy; when the target measurement value is inconsistent with the preset measurement value, the comparison result is untrustworthy. When the trusted chip determines that the laser scanning unit 200 is untrustworthy based on the comparison results, the trusted chip notifies the trusted computing supervisory unit 300 of the untrustworthy result of the laser scanning unit 200. The trusted computing supervisory unit 300 can upload the untrustworthy result of the laser scanning unit 200 to the imaging control unit 100. The imaging control unit 100 can notify the user of the untrustworthy result of the laser scanning unit 200 by displaying the result. At the same time, the imaging control unit 100 refuses the request to start the laser scanning unit 200 to avoid affecting the image formation quality of the image forming device or damaging the components within the image forming device. The imaging control unit 100 can also be connected to a terminal device via a network or USB (Universal Serial Bus). The imaging control unit 100 can also notify the terminal of the untrustworthy result of the laser scanning unit 200 via a network or USB. The user can obtain the untrustworthy information of the laser scanning unit 200 through the terminal device. The terminal device can be a personal computer, a smart phone, a tablet computer, a laptop computer, a PDA, an in-vehicle computer, or other mobile terminal devices with wireless communication capabilities.

[0055] Example 3

[0056] The parameters of the laser scanning unit 200 may further include one or more of an initialization timing parameter of the laser scanning unit 200 , a scanning timing parameter of the laser scanning unit 200 , and a printing timing parameter of the laser scanning unit 200 .

[0057] The parameters of the laser scanning unit 200 include time parameters and distance parameters. Specifically, the initialization timing parameters of the laser scanning unit 200 include a first time parameter and a first distance parameter. Of course, the initialization timing parameters of the laser scanning unit 200 may also include other types of parameters. The scanning timing parameters of the laser scanning unit 200 include a second time parameter and a second distance parameter. The printing timing parameters of the laser scanning unit 200 include a third time parameter and a third distance parameter. Of course, the scanning timing parameters of the laser scanning unit 200 and the printing timing parameters of the laser scanning unit 200 may also include other types of parameters.

[0058] Unlike the characteristic parameters of the laser scanning unit 200, the initialization timing parameters, scanning timing parameters, and printing timing parameters of the laser scanning unit 200 have different parameter ranges corresponding to different application scenarios. That is, the initialization timing parameters, scanning timing parameters, and printing timing parameters of the laser scanning unit 200 can be adjusted in different application scenarios. Although the initialization timing parameters, scanning timing parameters, and printing timing parameters of the laser scanning unit 200 have different parameter ranges corresponding to different application scenarios, the trusted computing supervision unit 300 or the imaging control unit 100 measures the boundary value or threshold of the parameter range of the initialization timing parameters, scanning timing parameters, or printing timing parameters of the laser scanning unit 200 to obtain a target measurement value. The trusted computing supervision unit 300 then determines whether the target measurement value is within the preset parameter range. If the target measurement value is within the preset parameter range, the laser scanning unit 200 is trustworthy.

[0059] The trusted chip stores preset measurement values (preset parameter ranges) corresponding to different application scenarios. The trusted computing supervision unit 300 can judge the operating scenario of the laser scanning unit 200 based on the obtained initialization timing parameters, scanning timing parameters and printing timing parameters of the laser scanning unit 200. After measuring the initialization timing parameters, scanning timing parameters and printing timing parameters of the laser scanning unit 200 based on the preset algorithm, the corresponding preset measurement value (preset parameter range) is called for comparison with the target measurement value.

[0060] Most of the initialization timing parameters, scanning timing parameters, and printing timing parameters of the laser scanning unit 200 are time parameters and distance parameters. The trusted computing supervision unit 300 or the imaging control unit 100 is further configured to convert the distance parameters into time parameters, and then use a preset algorithm to measure the converted time parameters and time parameters that do not require conversion. Alternatively, the trusted computing supervision unit 300 or the imaging control unit 100 further converts the time parameters into distance parameters, and then uses a preset algorithm to measure the converted distance parameters and distance parameters that do not require conversion. Alternatively, the trusted computing supervision unit 300 or the imaging control unit 100 does not convert between time parameters and distance parameters, but directly measures the acquired initialization timing parameters, scanning timing parameters, and printing timing parameters of the laser scanning unit 200.

[0061] The trusted computing supervision unit 300 or the imaging control unit 100 converts the distance parameter into the time parameter or converts the time parameter into the distance parameter, thereby facilitating the trusted computing supervision unit 300 to measure the initialization timing parameters, scanning timing parameters and printing timing parameters of the laser scanning unit 200, thereby improving the measurement efficiency.

[0062] The trusted computing supervision unit 300 can use different preset algorithms to measure the same set of time parameters, the same set of distance parameters, or the same set of time parameters and distance parameters. However, there is a one-to-one correspondence between each set of parameters, the preset algorithm, and the preset measurement value. For example, the trusted computing supervision unit 300 uses preset algorithm A to measure a set of time parameters to obtain a target measurement value A, and compares the target measurement value A with the preset measurement value A1 to determine whether the laser scanning unit 200 is trustworthy. The trusted computing supervision unit 300 can also use preset algorithm B to measure the same set of time parameters to obtain a target measurement value B, and compare the target measurement value B with the preset measurement value B1 to determine whether the laser scanning unit 200 is trustworthy. The trusted computing supervision unit 300 or the imaging control unit 100 can select an appropriate algorithm to measure the initialization timing parameters, scanning timing parameters, and printing timing parameters of the laser scanning unit 200 according to actual measurement needs to improve measurement efficiency and measurement accuracy.

[0063] The trusted computing supervision unit 300 can select a suitable algorithm to measure the initialization timing parameters of the laser scanning unit 200 according to actual measurement needs. Figure 3 In one application scenario, when the image forming device is a color printer, during the initialization process of the color printer, the color printer performs the following specific steps:

[0064] Step 1: LSU receives the START signal;

[0065] Step 2: The motor of the LSU reaches stability within time T1, and the LSU feeds back a Ready signal to the imaging control unit 100.

[0066] Step 3: Start LD.

[0067] The LD start signal is LD enable. LD needs to start within T2 after the LSU motor reaches stability.

[0068] Step 4: Generate an optical power correction signal S / H, and correct the optical power using the optical power correction signal S / H.

[0069] The optical power correction signal S / H is generated within time T3 after the LD is started. After the laser is exposed, the laser undergoes a light attenuation process. During the initialization phase, after the optical power correction signal S / H is generated, a charging process is performed. The charging time must be greater than time T4. After that, the optical power is corrected. The optical power correction process takes less than time T5.

[0070] Too high an optical power will result in a darker image, while too low an optical power will result in a lighter image. Therefore, the optical power needs to be corrected.

[0071] Figure 3 DATA_P and DATA_N are image signals. DATA_P and DATA_N are differential signals generated during the exposure phase. Laser Driver is the laser drive signal, which is corrected by the optical power correction signal S / H.

[0072] Right now Figure 3 The initialization timing parameters shown are time parameters, including T1, T2, T3, T4, and T5. The trusted computing supervision unit 300 can measure the overall parameters or part of the time parameters in the initialization timing of the color printer, and compare the measurement results with the preset measurement results to determine whether the laser scanning unit 200 is trustworthy. For example, the trusted computing supervision unit 300 can measure T1, T2, T3, T4, and T5 as a whole according to a preset algorithm to obtain a measurement result C1, and then compare C1 with the preset measurement result C2 stored in the trusted computing supervision unit 300 to determine whether the laser scanning unit 200 is trustworthy; of course, the trusted computing supervision unit 300 can measure part of the parameters of T1, T2, T3, T4, and T5, for example, T1 and T2 according to a preset algorithm to obtain a measurement result D1, and then compare D1 with the preset measurement result D2 stored in the trusted computing supervision unit 300 to determine whether the laser scanning unit 200 is trustworthy. It should be added that, when measuring the initialization timing parameters, multiple measurements may be performed, for example, the measurement of the overall parameters and the measurement of some parameters in the overall parameters may be performed simultaneously, which is not limited here.

[0073] By measuring the initialization timing parameters of the laser scanning unit 200 during the initialization phase of the laser scanning unit 200, it is ensured that each functional module of the laser scanning unit 200 can be turned on within the preset startup time range, thereby ensuring the correct initialization of the laser scanning unit 200 to produce effective and reliable images.

[0074] The trusted computing supervision unit 300 can also select a suitable algorithm to measure the scanning timing parameters of the laser scanning unit 200 according to actual measurement needs. Figure 4 In another application scenario, when the image forming device is a black and white printer, the black and white printer performs a scanning operation after initialization. During the scanning phase, the signal timing of the black and white printer is as follows:

[0075] Step 1: The LSU generates the horizontal synchronization signal Hsync. The black and white printer starts scanning.

[0076] Step 2: LSU generates image signal video.

[0077] Phase T0 is the time for scanning one line, phase T11 is the time for controlling the blank space on the left side of the scanning area, and phase T21 is the time for controlling the effective scanning area.

[0078] Step 3: Generate scanning optical power correction signal S / H.

[0079] Phase T31 is the time interval between the generation of the horizontal synchronization signal Hsync and the generation of the scanning optical power correction signal S / H.

[0080] The scanning optical power correction signal S / H is an optical power correction signal generated during the scanning phase. This signal control must be within the non-scanning area, otherwise, it will cause optical power abnormality, thereby resulting in image abnormality (too dark or light).

[0081] Step 4: Beam detector (BD) starts.

[0082] The time when the start signal BD enable of the beam detector is generated is the time when the line synchronization is controlled.

[0083] Right now Figure 4 The scanning timing parameters shown are time parameters, including T0, T11, T21, and T31. The trusted computing supervision unit 300 can measure the overall parameters or part of the time parameters in the initialization timing of the color printer, and compare the measurement results with the preset measurement results to determine whether the laser scanning unit 200 is trustworthy. For example, the trusted computing supervision unit 300 can measure T0, T11, T21, and T31 as a whole according to a preset algorithm to obtain a measurement result E1, and then compare E1 with the preset measurement result E2 stored in the trusted computing supervision unit 300 to determine whether the laser scanning unit 200 is trustworthy; of course, the trusted computing supervision unit 300 can measure part of the parameters of T0, T11, T21, and T31, for example, T0 and T21 according to a preset algorithm to obtain a measurement result F1, and then compare F1 with the preset measurement result F2 stored in the trusted computing supervision unit 300 to determine whether the laser scanning unit 200 is trustworthy.

[0084] It should be added that, when measuring the scan timing parameters, multiple measurements may be performed, for example, the measurement of the overall parameters and the measurement of some parameters in the overall parameters may be performed simultaneously, which is not limited here.

[0085] By measuring the scanning timing parameters of the laser scanning unit 200 during the scanning phase of the laser scanning unit 200 , it is ensured that each functional module of the laser scanning unit 200 can operate normally during the scanning phase to form an effective and reliable image.

[0086] The laser scanning unit 200's print timing parameters include first-category print timing parameters and second-category print timing parameters. The first-category print timing parameters include OPC spacing and line scan time. The trusted computing supervisory unit 300 or the imaging control unit 100 can convert the OPC spacing into time parameters, thereby facilitating measurement by the trusted computing supervisory unit 300. When the image forming device is a black and white printer, the second-category print timing parameters include the time to start imaging using the toner cartridges. When the image forming device is a color printer, the second-category print timing parameters include the time to start imaging using each color cartridge (cyan, magenta, yellow, and black), as well as the time interval between starting imaging using two of each color cartridge. For example, if the cartridges are used in the order of yellow, cyan, magenta, and black, the aforementioned time intervals include the time interval between starting to use the yellow and cyan cartridges, the time interval between starting to use the cyan and magenta cartridges, and the time interval between starting to use the magenta and black cartridges.

[0087] When the trusted computing supervisory unit 300 measures the printing timing parameters of the laser scanning unit 200, it can convert the OPC interval into a time parameter, thereby facilitating the measurement by the trusted computing supervisory unit 300. All printing timing parameters can be measured as a whole to obtain a measurement result P1, which can then be compared with a preset measurement result P2 stored in the trusted computing supervisory unit 300 to determine whether the laser scanning unit 200 is trustworthy. The trusted computing supervisory unit 300 can also measure some of the first and second timing parameters mentioned above, and then compare them with the preset measurement results stored in the trusted computing supervisory unit 300 to determine whether the laser scanning unit 200 is trustworthy.

[0088] By measuring the printing timing parameters of the laser scanning unit 200 during the printing phase of the laser scanning unit 200 , it is ensured that each functional module of the laser scanning unit 200 can perform the printing operation normally to generate an effective and reliable image.

[0089] It should be noted that, in an embodiment of the present invention, when determining whether the laser scanning unit 200 is trustworthy, one or more of the trustworthiness metrics of the initialization timing parameters, the trustworthiness metrics of the scanning timing parameters, and the trustworthiness metrics of the printing timing parameters can be executed. When the trusted computing supervision unit 300 determines that the laser scanning unit 200 is untrustworthy based on the comparison result, the imaging control unit 100 is also used to control the laser scanning unit 200 to stop running. During the initialization process of the laser scanning unit 200, if the laser scanning unit 200 is determined to be untrustworthy, the initialization of the laser scanning unit 200 is stopped; during the scanning process of the laser scanning unit 200, if the laser scanning unit 200 is determined to be untrustworthy, the laser scanning unit 200 is controlled to stop scanning; during the printing process of the laser scanning unit 200, if the laser scanning unit 200 is determined to be untrustworthy, the laser scanning unit 200 is controlled to stop the printing operation.

[0090] The image forming device of the present invention obtains the parameters of the laser scanning unit 200 through the trusted computing supervision unit 300 or the imaging control unit 100. The trusted computing supervision unit 300 or the imaging control unit 100 measures the parameters of the laser scanning unit 200 based on a preset algorithm to generate a target measurement value. The trusted computing supervision unit 300 is used to compare the target measurement value with the preset measurement value to generate a comparison result, and judge whether the laser scanning unit 200 is trustworthy based on the comparison result, thereby effectively detecting whether the laser scanning unit 200 meets the requirements, avoiding the laser scanning unit 200 that does not meet the requirements from continuing to operate, and ensuring the safety of the components in the image forming device and the image forming device forming an effective and reliable image.

[0091] Example 4

[0092] Please refer to Figure 5 An embodiment of the present invention further provides a method for detecting a laser scanning unit, which is applied to an image forming device. The method includes the following steps:

[0093] Step S01, obtaining parameters of the laser scanning unit.

[0094] Step S02: Measure the parameters of the laser scanning unit based on a preset algorithm to generate a target measurement value.

[0095] Step S03: Compare the target metric value with the preset metric value to generate a comparison result.

[0096] Step S04: judging whether the laser scanning unit is credible based on the comparison result.

[0097] In one embodiment, the parameters of the laser scanning unit include characteristic parameters of the laser scanning unit.

[0098] In one embodiment, the preset algorithm is a hash algorithm.

[0099] In one embodiment, the parameters of the laser scanning unit include one or more of initialization timing parameters, scanning timing parameters, and printing timing parameters of the laser scanning unit.

[0100] In one embodiment, the parameters of the laser scanning unit include a time parameter and a distance parameter. The method further includes: converting the distance parameter into a time parameter or converting the time parameter into a distance parameter.

[0101] In one embodiment, the method further includes: when the laser scanning unit is untrustworthy, controlling the laser scanning unit to stop operating.

[0102] The detection method of the laser scanning unit of the present invention obtains the parameters of the laser scanning unit, measures the parameters of the laser scanning unit based on a preset algorithm, generates a target measurement value, compares the target measurement value with the preset measurement value, generates a comparison result, and judges whether the laser scanning unit is trustworthy based on the comparison result, thereby effectively detecting whether the laser scanning unit meets the requirements, avoiding the laser scanning unit that does not meet the requirements from continuing to operate, and ensuring the safety of the components in the image forming device and the image forming device forming an effective and reliable image.

[0103] Example 5

[0104] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the above-mentioned detection method of the laser scanning unit is implemented. The execution method and beneficial effects thereof are similar and will not be described in detail here.

[0105] This embodiment provides an image forming device, including a processor and a memory, the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, it implements the above-mentioned detection method of the laser scanning unit. Its execution method and beneficial effects are similar and will not be repeated here.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for detecting a laser scanning unit, applied to an image forming device, characterized in that: The method comprises: Acquiring parameters of the laser scanning unit, wherein the parameters include a plurality of characteristic parameters of the laser scanning unit, and the characteristic parameters are inherent parameters of the laser scanning unit; Measuring the parameters of the laser scanning unit based on a preset algorithm to generate a target measurement value; Comparing the target metric value with a preset metric value to generate a comparison result; judging whether the laser scanning unit is credible according to the comparison result; The parameters of the laser scanning unit are measured based on a preset algorithm to generate a target Metrics, including: Calculating at least two of the multiple characteristic parameters according to a preset algorithm to generate the target metric value; The method further comprises: When the laser scanning unit is untrustworthy, the laser scanning unit is controlled to stop running.

2. An image forming device, characterized in that: Including trusted computing supervision unit, imaging control unit and laser scanning unit; The trusted computing supervision unit or the imaging control unit is used to obtain parameters of the laser scanning unit, The parameters include a plurality of characteristic parameters of the laser scanning unit, and the characteristic parameters are inherent parameters of the laser scanning unit; The trusted computing supervision unit or the imaging control unit is used to control the laser based on a preset algorithm. Scan the unit's parameters for measurement and generate target measurement values; The trusted computing supervision unit is used to compare the target metric value with the preset metric value, forming a comparison result, and judging whether the laser scanning unit is credible according to the comparison result; The parameters of the laser scanning unit are measured based on a preset algorithm to generate a target Metrics, including: Calculating at least two of the multiple characteristic parameters according to a preset algorithm to generate the target metric value; When the laser scanning unit is untrustworthy, the imaging control unit is further configured to control the laser scanning unit to stop operating.

3. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the detection method of the laser scanning unit as claimed in claim 1 is implemented.

4. An image forming device, characterized in that include: A processor and a memory, wherein the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the detection method of the laser scanning unit as claimed in claim 1 is implemented.

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