An image carrier abnormality detection method, an image forming apparatus, and a storage medium

Abstract

An image carrier abnormality detection method, an image forming apparatus and a storage medium are provided, and the method comprises: acquiring a first voltage value output by a charging detection circuit, the first voltage value being used to represent a voltage change state in the charging circuit, and the first voltage value being obtained in at least one image carrier rotation period; determining whether the first voltage value satisfies a preset condition; and if the first voltage value satisfies the preset condition, determining that the image carrier is abnormal. In the embodiment of the present application, whether the image carrier is abnormal can be determined based on the detected first voltage value, so that the user can be updated in time when the image carrier is abnormal, and the image quality is prevented from being reduced due to the continuous use of the image carrier when the image carrier is abnormal, thereby affecting the user experience.

Description

Technical Field

[0001] This application relates to the field of image forming technology, specifically to a method for detecting anomalies in an image carrier, an image forming apparatus, and a storage medium. Background Technology

[0002] An image forming apparatus is a device that forms an image on a recording medium using imaging principles, such as a printer, copier, fax machine, scanner, multifunction image making and copying apparatus, electrostatic printing apparatus, and any other similar apparatus.

[0003] Taking printers as an example, in existing technology, the printer drum assembly is a crucial component of the printer's imaging system. This is especially true for current A3 color printers, which employ a separate drum and toner design. The drum assembly is typically integrated with the printer and is not usually replaced during the printer's lifespan. However, during printer production, transportation, and use, the organic photoconductor (OPC) coating on the drum assembly is susceptible to wear due to mechanical impact. Furthermore, excessively high imaging voltage on the OPC surface can also cause damage to the OPC's outer layer. OPC wear can lead to high-voltage discharge during printing, resulting in carrier scattering and white spots in the image, causing serious image quality problems and impacting the user experience. Therefore, it is necessary to detect OPC damage to prevent image quality degradation. Summary of the Invention

[0004] In view of this, this application provides an image carrier anomaly detection method, an image forming apparatus, and a storage medium for detecting whether an anomaly has occurred in the image carrier to prevent a reduction in image quality.

[0005] In a first aspect, embodiments of this application provide a method for detecting anomalies in an image carrier, applied to an image forming apparatus, comprising:

[0006] A first voltage value output by the charging detection circuit is obtained. The first voltage value is used to characterize the voltage change state in the charging circuit. The first voltage value is obtained in at least one rotation cycle of the image carrier.

[0007] Determine whether the first voltage value meets the preset conditions;

[0008] If the first voltage value meets the preset conditions, it is determined that the image carrier is abnormal.

[0009] In one possible implementation, acquiring the first voltage value output by the charging detection circuit includes:

[0010] The first voltage value output by the charging detection circuit in the image forming operation detection stage is obtained. The image forming operation detection stage is the stage of charging detection of the image carrier before or during the execution of the image forming operation.

[0011] In one possible implementation, determining whether the first voltage value meets a preset condition includes:

[0012] Determine whether there is a voltage peak in the first voltage value;

[0013] If there is a voltage peak in the first voltage value, then determine whether the voltage peak meets the preset condition;

[0014] If the voltage peak value meets the preset conditions, then the first voltage value is determined to meet the preset conditions.

[0015] In one possible implementation, determining whether the voltage peak value meets a preset condition includes:

[0016] The peak voltage is obtained, and the average value of the peak voltage is taken to obtain the first average voltage.

[0017] The average of the first voltage value is taken to obtain the second average voltage value;

[0018] The first average voltage value is proportional to the second average voltage value;

[0019] Determine whether the result of the ratio calculation meets the set threshold;

[0020] If the result of the proportional calculation meets the set threshold, then the voltage peak value is determined to meet the preset condition.

[0021] In one possible implementation, obtaining the voltage peak value and averaging the voltage peak value to obtain a first voltage average value includes:

[0022] Obtain at least two maximum voltage values ​​from the voltage peaks, and average the at least two maximum voltage values ​​to obtain a first average voltage value.

[0023] In one possible implementation, determining whether the first voltage value meets a preset condition includes:

[0024] The image carrier detection signal is output based on the first voltage value;

[0025] The detection signal of the image carrier is detected;

[0026] When the image carrier detection signal is detected as a target signal, it is determined whether the number of times the target signal is detected is greater than a preset threshold.

[0027] If the number of times the target signal is detected is greater than a preset threshold, then the first voltage value is determined to meet the preset condition.

[0028] In one possible implementation, determining whether the first voltage value meets a preset condition includes:

[0029] The image carrier detection signal is output based on the first voltage value;

[0030] The image carrier detection signal is sampled and detected.

[0031] When the image carrier detection signal is detected as a target signal, it is determined whether the number of consecutive samplings that detect the target signal is greater than a preset threshold.

[0032] If the number of times the target signal is detected by continuous sampling is greater than a preset threshold, then the first voltage value is determined to meet the preset condition.

[0033] In one possible implementation, the method further includes:

[0034] If the image carrier malfunctions, the image forming operation is stopped, and the engine control voltage and imaging control voltage are turned off.

[0035] Secondly, embodiments of this application provide an image forming apparatus, comprising:

[0036] The acquisition unit is used to acquire a first voltage value output by the charging detection circuit. The first voltage value is used to characterize the voltage change state in the charging circuit. The first voltage value is acquired during at least one rotation cycle of the image carrier.

[0037] A judgment unit is used to determine whether the first voltage value meets a preset condition;

[0038] The determining unit is used to determine that an abnormality has occurred in the image carrier when the first voltage value meets a preset condition.

[0039] In one possible implementation, the device further includes:

[0040] The first sub-determination unit is used to determine whether there is a voltage peak in the first voltage value;

[0041] The first sub-judgment unit is used to determine whether the voltage peak value meets the preset condition when there is a voltage peak value in the first voltage value.

[0042] The second sub-determination unit is used to determine that the first voltage value meets the preset conditions when the voltage peak value meets the preset conditions.

[0043] In one possible implementation, the device further includes:

[0044] The output unit is used to output an image carrier detection signal based on the first voltage value;

[0045] The detection unit is used to detect the detection signal of the image carrier;

[0046] The second sub-judgment unit is used to determine whether the number of times the target signal is detected is greater than a preset threshold when the image carrier detection signal is detected as a target signal.

[0047] The third sub-determination unit is used to determine that the first voltage value meets the preset condition when the number of times the target signal is detected is greater than a preset threshold.

[0048] Thirdly, embodiments of this application provide an image forming apparatus, including:

[0049] A charging detection circuit is used to detect voltage changes in the image carrier charging circuit and output a first voltage value.

[0050] An image carrier anomaly detection circuit is used to receive a first voltage value output by the charging detection circuit and output an image carrier detection signal based on the first voltage value.

[0051] The control unit is used to receive the image carrier detection signal and determine whether the image carrier is abnormal based on the image carrier detection signal.

[0052] In one possible implementation, the image carrier anomaly detection circuit includes:

[0053] The first voltage divider filter module has its input terminal electrically connected to the output terminal of the charging detection circuit. The first voltage divider filter module is used to receive the first voltage value output by the charging detection circuit and output a first voltage divider filter signal based on the first voltage value.

[0054] The second voltage divider filter module has its input terminal electrically connected to the output terminal of the charging detection circuit. The second voltage divider filter module is used to receive the first voltage value output by the charging detection circuit and output a second voltage divider filter signal based on the first voltage value.

[0055] An operational amplifier is provided, wherein the inverting input terminal of the operational amplifier is electrically connected to the output terminal of the first voltage divider filter module, and the non-inverting input terminal of the operational amplifier is electrically connected to the output terminal of the second voltage divider filter module. The operational amplifier is used to output an operational amplified signal based on the first voltage divider filter signal and the second voltage divider filter signal.

[0056] A detection signal output module is provided, wherein the input terminal of the detection signal output module is electrically connected to the output terminal of the operational amplifier, and the detection signal output module is used to receive the operational amplifier signal and output the image carrier detection signal based on the operational amplifier signal.

[0057] In one possible implementation, the voltage division ratio of the first voltage divider filter module is greater than that of the second voltage divider filter module, and the charging time constant of the first voltage divider filter module is greater than that of the second voltage divider filter module; or, the voltage division ratio of the first voltage divider filter module is less than that of the second voltage divider filter module, and the charging time constant of the first voltage divider filter module is less than that of the second voltage divider filter module.

[0058] In one possible implementation, the detection signal output module includes:

[0059] The first transistor has its control terminal electrically connected to the output terminal of the operational amplifier, its first terminal electrically connected to the power supply voltage, its second terminal grounded, and its first terminal also electrically connected to the input terminal of the control unit. The first transistor is used to control the image carrier detection signal input to the control unit according to the operational amplifier signal.

[0060] In one possible implementation, the control unit includes:

[0061] The input module is used to receive the image carrier detection signal;

[0062] The detection module is used to detect the detection signal of the image carrier;

[0063] The judgment module is used to determine whether the number of times the target signal is detected is greater than a preset threshold when the image carrier detection signal is detected as a target signal.

[0064] The output module is used to output an image carrier abnormality signal when the number of times the target signal is detected exceeds a preset threshold.

[0065] In one possible implementation, the control unit further includes:

[0066] The control module is used to stop the image forming operation and shut down the engine control voltage and imaging control voltage when the image carrier malfunctions.

[0067] Fourthly, embodiments of this application provide an image forming apparatus, comprising:

[0068] processor;

[0069] Memory;

[0070] The memory stores a computer program that, when executed, causes the image forming apparatus to perform the method described in any of the first aspects.

[0071] Fifthly, embodiments of this application provide a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the method described in any of the first aspects.

[0072] In this embodiment, by determining whether the image carrier is abnormal based on the detected first voltage value, the user can update the image carrier in a timely manner when an abnormality occurs, preventing the image quality from deteriorating and affecting the user experience if the image carrier continues to be used when an abnormality occurs. Attached Figure Description

[0073] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0074] Figure 1 This is a schematic diagram of the structure of an image forming apparatus provided in an embodiment of this application;

[0075] Figure 2 This is a schematic diagram of the structure of an image carrier provided in an embodiment of this application;

[0076] Figure 3 This is a schematic diagram of an image carrier anomaly detection method provided in an embodiment of this application;

[0077] Figure 4 This is a schematic diagram of a charging detection circuit structure provided in an embodiment of this application;

[0078] Figure 5 This application provides a schematic diagram of a voltage waveform when the surface of an OPC is damaged.

[0079] Figure 6 This is a schematic flowchart of an image carrier anomaly detection method provided in an embodiment of this application;

[0080] Figure 7 This is a schematic diagram of another voltage waveform when the OPC surface is damaged, provided in an embodiment of this application.

[0081] Figure 8 A circuit block diagram of an image forming apparatus provided in an embodiment of this application;

[0082] Figure 9 This is a schematic diagram of another charging detection circuit structure provided in an embodiment of this application;

[0083] Figure 10 This is a schematic diagram of an image carrier anomaly detection circuit structure provided in an embodiment of this application;

[0084] Figure 11 This application provides a schematic diagram of the voltage waveform when the surface of an OPC is damaged after adding an image carrier anomaly detection circuit.

[0085] Figure 12 A structural block diagram of a control unit provided in an embodiment of this application;

[0086] Figure 13 This is a schematic flowchart of another image carrier anomaly detection method provided in an embodiment of this application;

[0087] Figure 14 A structural block diagram of an image forming apparatus provided in an embodiment of this application;

[0088] Figure 15 This is a structural block diagram of another image forming apparatus provided in an embodiment of this application. Detailed Implementation

[0089] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0090] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0091] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0092] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0093] See Figure 1This is a schematic diagram of the structure of an image forming apparatus provided in an embodiment of this application. Figure 1 As shown, the image forming apparatus includes at least a charging roller 1, a developing roller 3, an image carrier 2, and a transfer roller 4. The charging roller 1 forms a layer of charge on the surface of the image carrier 2. Based on information received by the image forming apparatus, the charge forms an electrostatic latent image corresponding to that information. The developing roller 3 transfers developer to the image carrier 2, which develops the electrostatic latent image on the surface of the image carrier 2. Then, the transfer roller 4 transfers the image formed on the surface of the image carrier 2 onto paper. Therefore, the image carrier 2 is the core component of the image forming apparatus; its quality affects not only the image forming effect but also the reliability of the image forming apparatus. It should be noted that in some possible implementations, the image carrier is also called a photosensitive drum.

[0094] See Figure 2 This is a schematic diagram of the structure of an image carrier provided in an embodiment of this application. Figure 2 As shown, the basic structure of the image carrier consists of a conductive substrate 201 (aluminum cylinder or other metal material), an insulating layer 202, and a photosensitive layer 203. The photosensitive layer 203, typically made of OPC, has a very high resistivity in dark environments, approximating an insulator. Upon exposure to light, it quickly becomes a conductor. Before exposure, the photosensitive layer 203 is uniformly charged by the charging roller 1. After exposure, the surface potential of the exposed areas decreases, forming black areas in the image, and the charge is released to ground by the conductive substrate. Unexposed areas have a high surface potential, forming white areas in the image, which retain their original charge. This creates a potential difference latent image (electrostatic latent image) on the surface of the image carrier 2. Therefore, wear of the photosensitive layer 203 can lead to high-voltage discharge during imaging, causing carrier scattering and white spots in the image, resulting in serious image quality problems and affecting the user experience.

[0095] To detect OPC damage and allow users to update their OPCs promptly when damage occurs, preventing image quality degradation and user experience impacted by continued use of damaged OPCs, this application provides an image carrier anomaly detection method, an image forming apparatus, and a storage medium.

[0096] See Figure 3 This diagram illustrates an image carrier anomaly detection method provided in this application. Figure 3 As shown, the method includes: S301: acquiring a first voltage value output by the charging detection circuit, the first voltage value being used to characterize the voltage change state in the charging circuit, the first voltage value being acquired during at least one rotation cycle of the image carrier.

[0097] In practice, during the image formation process, the image carrier is charged with a uniform charge. At the same time, the drive motor causes the image carrier to rotate continuously to form an image. Meanwhile, the charging detection circuit detects the voltage changes in the charging circuit and uses the first voltage value, i.e., the charging feedback signal MHV_READ, to characterize the voltage change state in the charging circuit. When the image carrier malfunctions, the first voltage value will fluctuate. Therefore, the first voltage value output by the charging detection circuit can be used to determine whether the image carrier has malfunctioned.

[0098] In one possible implementation, the charging feedback signal MHV_READ can be acquired at the stage before the image forming operation is performed, at which time the image carrier rotates one revolution under the action of the drive motor. Therefore, the obtained charging feedback signal MHV_READ is the voltage value output by the charging detection circuit during the process of the photosensitive drum rotating one revolution.

[0099] It should be noted that the image formation job detection stage MHV_DET is the stage where the photosensitive drum is charged before the image formation job is performed.

[0100] In another possible implementation, the charging feedback signal MHV_READ can also be acquired during the MHV_PRINT stage when the image forming operation is performed. At this time, the image carrier rotates for multiple cycles under the action of the drive motor. Therefore, the obtained charging feedback signal MHV_READ is the voltage value output by the charging detection circuit during the multiple cycles of the image carrier rotation. It can be expected that this voltage value is a periodic voltage value.

[0101] In this embodiment of the application, the schematic diagram of the charging detection circuit structure is as follows: Figure 4 As shown in the diagram. Here, MHV_PWM is the control signal for the output charging high voltage, MHV is the charging negative high voltage, and MHV_READ (not shown in the diagram) is a voltage value reflecting the output current, i.e., the first voltage value, which is transmitted to the System on Chip (SOC) on the data board for data processing. According to actual requirements, the load RL of the charging high voltage back-end system is within a certain range. The output detection voltage range is determined by the difference between the charging feedback voltage MHV_READ corresponding to different loads RL; the larger the difference, the wider the output detection range. The resolution is determined by MHV_READ / RL; the higher the slope, the greater the resolution.

[0102] In practice, the charging detection circuit consists of three modules: a sampling circuit, an operational amplifier circuit, and an output filter circuit. The sampling circuit samples the high-voltage output load current I2 and the feedback circuit current I1, thus the sampled voltage is proportional to the output current I2. The operational amplifier circuit uses the sampled voltage V1 as its input voltage and MHV_READ as the charging feedback signal. By constructing the operational amplifier circuit, a proportional relationship is established between the V1 and MHV_READ signals. The slope of the function can be changed by adjusting the resistor parameters in the circuit, thereby improving the detection resolution of the main control board SOC for the high-voltage back-end system load RL. After the charging feedback signal MHV_READ is transmitted to the main control board, it undergoes analog-to-digital conversion by the onboard ADC module, becoming a digital signal that is read by the SOC. Based on the signal transmitted to the SOC, the current value flowing through the sampling circuit can be monitored. Under a certain voltage output from MHV, this current value also reflects, to a certain extent, the changes in the MHV back-end load.

[0103] It should be noted that the specific circuit structure of the charging detection circuit is existing technology, and for the sake of brevity, it will not be described in detail here.

[0104] S302: Determine whether the first voltage value meets the preset conditions.

[0105] In this embodiment, if the OPC surface is damaged, the overall system impedance of the OPC will be significantly reduced at the damaged point. Therefore, if the OPC surface is damaged during the image formation process, as long as the high voltage is turned on and the image carrier rotates, a voltage spike can be collected on the first voltage value output by the charging detection circuit, i.e., the charging feedback signal MHV_READ.

[0106] Therefore, in one possible implementation, determining whether the first voltage value meets the preset condition includes: determining whether there is a voltage peak in the first voltage value; if there is a voltage peak in the first voltage value, determining whether the voltage peak meets the preset condition; if the voltage peak meets the preset condition, determining that the first voltage value meets the preset condition.

[0107] In practice, the presence of voltage spikes on the charging feedback signal MHV_READ does not necessarily indicate damage to the OPC surface. Sometimes, voltage spikes may be caused by other factors, such as instrument vibration or voltage instability. Therefore, it is necessary to judge the obtained voltage peak values ​​and eliminate interference from other factors.

[0108] Specifically, in one possible implementation, determining whether the voltage peak value meets the preset condition includes: acquiring the voltage peak value; averaging the voltage peak values ​​to obtain a first voltage average value; averaging the first voltage value to obtain a second voltage average value; performing a ratio calculation between the first voltage average value and the second voltage average value; determining whether the ratio calculation result meets a set threshold; if the ratio calculation result meets the set threshold, then it is determined that the voltage peak value meets the preset condition, and the photosensitive drum coating is damaged. In a specific implementation, averaging all acquired voltage peak values ​​would involve a large amount of computation. Therefore, to reduce the computational load and eliminate unexpected interference, the first voltage average value can be obtained by averaging at least two maximum voltage values ​​from the voltage peak values.

[0109] S303: If the first voltage value meets the preset conditions, it is determined that the image carrier is abnormal.

[0110] In practice, if an abnormality occurs in the image carrier, the image forming operation will be stopped, and the engine control voltage and imaging control voltage will be turned off.

[0111] For ease of understanding, the image carrier anomaly detection method provided in the above embodiments of this application will be described in detail below with reference to a specific implementation method.

[0112] See Figure 5 This is a schematic diagram of the voltage waveform when the surface of an OPC is damaged, provided in an embodiment of this application. Figure 5 As shown, in the MHV_DET(T3) stage, the second average voltage value of the image carrier after one revolution is obtained through the charging feedback signal MHV_READ. When there is damage on the OPC surface, the system impedance at the damaged point on the OPC surface will be significantly reduced, and a voltage spike will be generated on the charging feedback signal MHV_READ due to the OPC damage. In actual process, this voltage spike lasts for about 100ms. Therefore, sampling can be performed every 10ms in the MHV_DET(T3) stage, and at least 10 abnormal points can be sampled. By averaging at least two maximum voltage values ​​in the abnormal point, the first average voltage value is obtained. By calculating the ratio of the first average voltage value to the second average voltage value, it can be determined whether the OPC surface is damaged.

[0113] It should be noted that the sampling interval can be set as needed, such as 5ms, 15ms, 20ms, etc. This application does not make specific requirements in this regard.

[0114] See Figure 6 This is a schematic flowchart of an image carrier anomaly detection method provided in conjunction with the printing process according to an embodiment of this application. Figure 6 As shown, the process includes:

[0115] S601: Start the operation.

[0116] Receive the print job and start printing according to the print job requirements.

[0117] S602: Complete the MHV_DET stage detection according to the timing sequence.

[0118] Complete the MHV_DET stage detection according to the printing sequence.

[0119] S603: Sample the MHV_DET stage to obtain the second voltage average.

[0120] During the MHV_DET stage, the charging feedback signal MHV_READ is sampled, and the average value of the read charging feedback signal MHV_READ is taken to obtain the second voltage average value.

[0121] It should be noted that the average value of the second voltage is the reading value of the MHV_DET stage. The specific detection scheme is provided by the equipment used, and this application does not make specific requirements for it.

[0122] S604: Read the three maximum voltage values ​​MAX1 / 2 / 3 of the MHV_DET stage and obtain the first average voltage value.

[0123] The three maximum charging feedback signals MHV_READ values ​​read during the MHV_DET stage are denoted as MAX1, MAX2, and MAX3, and the average of these three maximum values ​​MAX1, MAX2, and MAX3 is taken as the first voltage average value. In this embodiment, by averaging the three maximum charging feedback signals MHV_READ, misjudgments caused by reading interference signals can be avoided.

[0124] S605: First voltage average / Second voltage average * 100% > 200%.

[0125] The average first voltage value is calculated as a ratio to the average second voltage value. If the ratio is greater than Per_max, it is determined that the OPC surface is damaged and the image carrier is abnormal, and step S607 is executed. If the ratio does not exceed Per_max, it is determined that the OPC surface is not damaged, and step S606 is executed. It should be noted that Per_max is the benchmark value for judging abnormality, and its value is determined by comprehensive judgment after actual testing. In this embodiment of the application, Per_max can be 200%.

[0126] S606: Complete the task.

[0127] Proceed with the printing process as required until the job is finished.

[0128] S607: Disable EC_24V

[0129] Stop the printing job and turn off the 24V operating voltage used for engine control. In practice, you can also turn off the high-voltage control signals for imaging.

[0130] Step S608: Fault alarm.

[0131] Output a fault alarm signal. In specific implementations, the fault alarm signal can be information displayed on the screen, voice information, light information, etc., and this application embodiment does not impose specific limitations on this.

[0132] In another possible implementation, determining whether the first voltage value meets the preset condition can also be done in the following way, specifically including: outputting an image carrier detection signal based on the first voltage value; detecting the image carrier detection signal; when the image carrier detection signal is detected as a target signal, determining whether the number of times the target signal is detected is greater than a preset threshold; if the number of times the target signal is detected is greater than the preset threshold, then determining that the first voltage value meets the preset condition.

[0133] In this embodiment, a first voltage value can be used as an input signal, and an image carrier detection signal can be output based on the first voltage value. Specifically, when the OPC surface is damaged, a voltage spike will be generated on the first voltage value, i.e., the charging feedback signal MHV_READ. The image carrier detection signal output based on the voltage spike is the target signal, and the image carrier detection signal output based on the non-voltage spike is the non-target signal. When a target signal is detected, the number of times the target signal is detected is counted. If the number of times the target signal is detected is greater than a preset threshold, then the first voltage value is determined to meet a preset condition.

[0134] In practice, the preset threshold can be set according to the rotation period of the image carrier, the duration of the target signal, etc., but this application does not make specific requirements in this regard.

[0135] In the embodiments of this application, the target signal output based on the voltage spike can be a target signal continuously output based on one voltage spike, or a target signal continuously output based on multiple voltage spikes.

[0136] Since the target signal is a continuous electrical signal, in order to ensure detection efficiency, in one possible implementation, the image carrier detection signal can be detected by sampling. When the image carrier detection signal is detected as the target signal, it is determined whether the number of times the target signal is detected by continuous sampling is greater than a preset threshold. If the number of times the target signal is detected by continuous sampling is greater than the preset threshold, it is determined that the first voltage value meets the preset condition.

[0137] In practice, the sampling interval can be set according to the duration of the target signal; this application does not make specific requirements in this regard.

[0138] In practice, during continuous sampling and detection, if a non-target signal is detected, the number of times the target signal is detected is counted as 0 until the target signal is detected again, at which point the count of the number of times the target signal is detected is restarted, in order to eliminate voltage spikes caused by other factors.

[0139] For ease of understanding, the image carrier anomaly detection method provided in the above embodiments of this application will be described in detail below with reference to a specific implementation method.

[0140] See Figure 7 This is a schematic diagram of the voltage waveform when the OPC surface is damaged, as provided in another embodiment of this application. Because the overall system impedance of the OPC will significantly decrease at the damaged area after the OPC surface is damaged. During the image formation process, the drive motor causes the image carrier to rotate continuously for imaging. If the OPC surface is damaged, then during the image formation stage, as long as the charging high voltage MHV is activated and the image carrier rotates, periodic voltage spikes can be collected on the charging feedback signal MHV_READ. (Comparison) Figure 5 In contrast, MHV_DET, which can only detect the image carrier's rotation for one cycle and obtain a set of voltage spikes, can only detect the image carrier's rotation for one cycle during the image formation process. In contrast, MHV_PRINT, which is performed during the image formation process, can obtain voltage spikes for multiple cycles because the image carrier rotates for multiple cycles. Therefore, MHV_PRINT is more accurate and reliable for detecting OPC damage during the image formation process.

[0141] Based on this, this application provides an image forming apparatus. See also Figure 8 This is a circuit block diagram of an image forming apparatus provided in an embodiment of this application. Figure 8 As shown, the image forming apparatus includes: a charging detection circuit 801 for detecting voltage change in the image carrier charging circuit and outputting a first voltage value; an image carrier abnormality detection circuit 802 for receiving the first voltage value output by the charging detection circuit and outputting an image carrier detection signal based on the first voltage value; and a control unit 803 for receiving the image carrier detection signal and determining whether an abnormality has occurred in the image carrier based on the image carrier detection signal.

[0142] Since the first voltage value output by the charging detection circuit needs to be input into the image carrier anomaly detection circuit in this embodiment, this embodiment provides another charging detection circuit. See also Figure 9 The charging detection circuit and Figure 4 In contrast, a set of signals MHV_READ_Z is output from the operational amplifier circuit and used as the input signal for the image carrier anomaly detection circuit.

[0143] See Figure 10 This is a schematic diagram of an image carrier anomaly detection circuit provided in an embodiment of this application. The image carrier anomaly detection circuit uses MHV_READ_Z as the input signal and P_OUT as the output signal.

[0144] Specifically, the image carrier anomaly detection circuit includes:

[0145] The first voltage divider filter module, composed of R9, R10, and C6, has its input terminal electrically connected to the output terminal of the charging detection circuit. The first voltage divider filter module is used to receive the MHV_READ_Z signal, perform voltage divider filtering on the MHV_READ_Z signal, and output the first voltage divider filter signal.

[0146] The second voltage divider filter module, composed of R11, R12, and C7, has its input terminal electrically connected to the output terminal of the charging detection circuit. The second voltage divider filter module is used to receive the MHV_READ_Z signal, perform voltage divider filtering on the MHV_READ_Z signal, and output the second voltage divider filter signal.

[0147] Operational amplifier U2B has its inverting input connected to the output of the first voltage divider filter module and its non-inverting input connected to the output of the second voltage divider filter module. Operational amplifier U2B receives the first and second voltage divider filter signals, compares them, and outputs an operationally amplified signal based on the comparison result. Specifically, the operationally amplified signal includes a first signal and a second signal, where the first signal is high and the second signal is low; or, the first signal is low and the second signal is high.

[0148] The detection signal output module has its input terminal electrically connected to the output terminal of the operational amplifier U2B. This module receives the operationally amplified signal and outputs an image carrier detection signal P_OUT based on it. Specifically, the image carrier detection signal P_OUT includes a target signal and a non-target signal, where the target signal is low and the non-target signal is high; or the target signal is high and the non-target signal is low.

[0149] In one possible implementation, the detection signal output module includes a third voltage divider filter module composed of R13, R14, and C8, and a first transistor Q1. The input terminal of the third voltage divider filter module is electrically connected to the output terminal of the operational amplifier U2B, and the output terminal of the third voltage divider filter module is connected to the control terminal of the first transistor Q1. The first terminal of the first transistor Q1 is connected to the power supply voltage through a resistor R15, and the second terminal of the first transistor Q1 is grounded. The output terminal of the detection signal output module is located on the connection line between the first terminal of the first transistor Q1 and the resistor R15.

[0150] It should be noted that the transistor in this application is a transistor operating in linear mode to provide a current path, including a type selected from bipolar transistors or field-effect transistors. The first terminal and the second terminal of the transistor are the high potential terminal and the low potential terminal on the current path, respectively, and the control terminal is used to receive a drive signal to control the voltage drop of the transistor. The transistor can be an NPN type transistor or a PNP type transistor, and the first terminal, the second terminal, and the control terminal of the NPN type transistor or the PNP type transistor are the emitter, the collector, and the base, respectively.

[0151] In practical implementation, the voltage division ratio of the first voltage divider filter module is denoted as A1, and the charging time constant is denoted as T1. The voltage division ratio of the second voltage divider filter module is denoted as A2, and the charging time constant is denoted as T2. Through hardware design, the voltage division ratio is configured as A1 = 1.33 * A2, and the charging time constant is configured as T1 = 3 * T2. In practical implementation, the voltage division ratio and charging time constant can be adjusted by adjusting the parameters of the resistors and capacitors, as long as A1 is greater than A2 and T2 is much smaller than T1.

[0152] like Figure 10 As shown, after configuring according to the above ratio, the circuit input is the same signal MHV_READ_Z. The voltage division ratio at the inverting input terminal of operational amplifier U2B is higher than that at the non-inverting input terminal. Therefore, under normal conditions, the voltage at the inverting input terminal of operational amplifier U2B is higher than the voltage at the non-inverting input terminal V->V+. The output of operational amplifier U2B-7pin is low, the first transistor Q1 is cut off, and the OPC skin damage detection signal P_OUT outputs a high level.

[0153] If a chip appears on the OPC surface, the charging feedback voltage MHV_READ will output a voltage spike during the printing process. Similarly, the input signal MHV_READ_Z of the OPC chip detection circuit will also output a voltage spike. At this time, because the charging time constant T2 of the non-inverting input is much smaller than the charging time constant T1 of the inverting input, the voltage rise rate of the non-inverting input will be much faster than the voltage rise rate of the inverting input. Therefore, there is a voltage difference V+ > V- between the non-inverting and inverting inputs. The output of the operational amplifier U2B is high, the first transistor Q1 is turned on and pulled low, and the OPC chip detection signal P_OUT is low.

[0154] In one possible implementation, the first voltage divider filter module can be connected to the non-inverting input of operational amplifier U2B, and the second voltage divider filter module can be connected to the inverting input of operational amplifier U2B. In this case, under normal conditions, the voltage at the non-inverting input of operational amplifier U2B is higher than the voltage at the inverting input, V+>V-. The output of operational amplifier U2B-7pin is high, the first transistor Q1 is turned on and pulled low, and the OPC damage detection signal P_OUT is low. If damage occurs on the surface of the OPC, there is a voltage difference V->V+ between the inverting and non-inverting inputs of operational amplifier U2B. The output of operational amplifier U2B is low, the first transistor Q1 is turned off, and the OPC damage detection signal P_OUT is high.

[0155] In another possible implementation, the voltage divider ratio can be configured as A2 = 1.33 * A1, and the charging time constant as T2 = 3 * T1, through hardware design. In this case, under normal conditions, the voltage at the non-inverting input of operational amplifier U2B is higher than the voltage at the inverting input (V+ > V-), so the output of operational amplifier U2B-7pin is high, the first transistor Q1 is turned on and pulled low, and the OPC damage detection signal P_OUT outputs a low level. If damage occurs on the OPC surface, a voltage difference V->V+ exists between the inverting and non-inverting inputs of operational amplifier U2B, so the output of operational amplifier U2B-7pin is low, the first transistor Q1 is turned off, and the OPC damage detection signal P_OUT outputs a high level.

[0156] The following example uses a low-level P_OUT output to indicate damage to the OPC surface. In this embodiment, after adding an image carrier anomaly detection circuit, the voltage waveform is as follows: Figure 11As shown, when damage occurs on the OPC surface, P_OUT will output a low level. During the MHV_DET stage, since there is only one set of voltage spikes in the charging feedback signal MHV_READ, the low level output time of P_OUT is short. However, during the MHV_PRINT stage, since the charging feedback signal MHV_READ includes multiple sets of periodic voltage spikes, P_OUT will continuously output a low level. Therefore, by detecting the low level output of P_OUT during the MHV_PRINT stage, it can be determined whether the OPC is damaged.

[0157] See Figure 12 This is a structural block diagram of a control unit provided in an embodiment of this application. Figure 12 As shown, the control unit includes: an input module 1201 for receiving an image carrier detection signal P_OUT; a detection module 1202 for detecting the image carrier detection signal P_OUT; a judgment module 1203 for determining whether the number of times the target signal is detected is greater than a preset threshold when the image carrier detection signal P_OUT is detected as a target signal; and a determination module 1204 for determining that an abnormality has occurred in the image carrier when the number of times the target signal is detected is greater than the preset threshold.

[0158] In practice, when an OPC is damaged, P_OUT continuously outputs a low level until the printing process ends. Therefore, to ensure the efficiency of OPC damage detection, P_OUT is generally detected by interval sampling. Specifically, the P_OUT output level is sampled at intervals. When the P_OUT output level is sampled low multiple times in a row, it is considered that there is damage on the OPC surface, resulting in abnormal charging high voltage.

[0159] It should be noted that once the P_OUT output level is sampled as high during the sampling process, the sampling count is 0, and the sampling count will only start again when the P_OUT output level is sampled as low.

[0160] In one possible implementation, the control unit further includes a control module for stopping the image forming operation and shutting down the engine control voltage and imaging control voltage when an abnormality occurs in the image carrier.

[0161] In practice, when an abnormal charging high voltage is detected due to damage to the OPC surface, the control module controls the image forming device to stop performing image forming operations and shuts off the 24V operating voltage and all imaging high voltage control signals.

[0162] To facilitate understanding, the image carrier anomaly detection process provided in the above embodiments of this application will be described in detail below with reference to a specific implementation method. For example... Figure 13The diagram shown is a schematic flowchart of another image carrier anomaly detection method provided in conjunction with the printing process according to an embodiment of this application. Specifically, it includes:

[0163] S1301: Start the operation.

[0164] Receive the print job and start printing according to the print job requirements.

[0165] S1302: Complete the MHV_DET stage detection according to the timing sequence.

[0166] Complete the MHV_DET stage detection according to the printing sequence.

[0167] S1303: Determine the printing charging voltage by referring to the table.

[0168] The operating voltage for the MHV_PRINT stage is determined by looking up a table, and a high charging voltage is output.

[0169] S1304: Delay 200ms.

[0170] First, a 200ms delay is applied to ensure that the voltage at the input of the operational amplifier in the OPC damage detection circuit is stable.

[0171] S1305: Reads the OPC damage detection signal P_OUT level every 10ms.

[0172] The P_OUT output level is sampled at intervals. The interval sampling time can be set according to the requirements. This application does not require this. Preferably, the interval sampling time of this application is set to 10ms.

[0173] S1306: Determine if P_OUT is low.

[0174] The read P_OUT level is judged. When P_OUT is high, the process proceeds to step S1308; when P_OUT is low, the process proceeds to step S1307.

[0175] S1307: Anomaly count Num, Num = Num + 1

[0176] When P_OUT is low, perform an exception count Num = Num + 1 and proceed to step S1309.

[0177] S1308: Num = 0

[0178] When P_OUT is high, the exception count is set to Num = 0, and the process proceeds to step S1305.

[0179] S1309: Determine Num ≥ 10.

[0180] The system determines whether the anomaly count Num is ≥10. If Num < 10, proceed to step S1305; if Num ≥ 10, proceed to step S1310. In specific implementation, this application does not require a threshold value for the anomaly count Num; it can be set according to actual needs during use.

[0181] S1310: Disable EC_24V

[0182] To stop printing, the 24V operating voltage is turned off. In practice, this can also be done by turning off all imaging high-voltage control signals.

[0183] S1311: Fault alarm.

[0184] Output a fault alarm signal. In specific implementations, the fault alarm signal can be information displayed on the screen, voice information, light information, etc., and this application embodiment does not impose specific limitations on this.

[0185] In this embodiment, if the P_OUT output voltage is high, the printing operation will proceed normally according to the printing requirements until the job is completed.

[0186] In this embodiment, the voltage abnormality caused by OPC damage is determined by low-cost methods such as calculation or setting up a separate image carrier abnormality detection circuit based on the detected voltage peak. This allows for timely updates when OPC damage occurs, preventing image quality degradation and impacting user experience caused by continued use of damaged OPC.

[0187] Corresponding to the above embodiments, this application also provides an image forming apparatus.

[0188] See Figure 14 This is a structural block diagram of an image forming apparatus provided in an embodiment of this application. Figure 14 As shown, the image forming apparatus 1400 includes: an acquisition unit 1401, configured to acquire a first voltage value output by a charging detection circuit, the first voltage value being used to characterize the voltage change state in the charging circuit, and the first voltage value being acquired during at least one rotation cycle of an image carrier; a judgment unit 1402, configured to determine whether the first voltage value meets a preset condition; and a determination unit 1403, configured to determine that an abnormality has occurred in the image carrier when the first voltage value meets the preset condition.

[0189] In one possible implementation, the image forming apparatus 1400 further includes:

[0190] A first sub-determining unit is used to determine whether a voltage peak exists in the first voltage value; a first sub-judgment unit is used to determine whether the voltage peak meets a preset condition when a voltage peak exists in the first voltage value; a second sub-determining unit is used to determine that the first voltage value meets the preset condition when the voltage peak meets the preset condition.

[0191] In one possible implementation, the image forming apparatus 1400 further includes:

[0192] The output unit is used to output an image carrier detection signal based on a first voltage value; the detection unit is used to detect the image carrier detection signal; the second sub-judgment unit is used to determine whether the number of times the target signal is detected is greater than a preset threshold when the image carrier detection signal is detected as a target signal; the third sub-determination unit is used to determine that the first voltage value meets a preset condition when the number of times the target signal is detected is greater than the preset threshold.

[0193] For details of the embodiments of this application, please refer to the description of the above method embodiments. For the sake of brevity, they will not be repeated here.

[0194] Corresponding to the above embodiments, this application also provides another image forming apparatus.

[0195] See Figure 15 This is a structural block diagram of another image forming apparatus provided in an embodiment of this application. Figure 15 As shown, the image forming apparatus 1500 may include a processor 1501, a memory 1502, and a communication unit 1503. These components communicate via one or more buses. Those skilled in the art will understand that the structure of the server shown in the figure does not constitute a limitation on the embodiments of the present invention. It may be a bus topology or a star topology, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0196] The communication unit 1503 is used to establish a communication channel, enabling the storage device to communicate with other devices. It can receive user data sent by other devices or send user data to other devices.

[0197] The processor 1501 serves as the control center of the storage device, connecting various parts of the electronic device via various interfaces and lines. It executes software programs and / or modules stored in the memory 1502, and retrieves data stored in the memory, to perform various functions of the electronic device and / or process data. The processor can be composed of integrated circuits (ICs), such as a single packaged IC or multiple packaged ICs with the same or different functions connected together. For example, the processor 1501 may consist only of a central processing unit (CPU). In this embodiment of the invention, the CPU may have a single processing core or include multiple processing cores.

[0198] The memory 1502 is used to store the execution instructions of the processor 1501. The memory 1502 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0199] When the execution instructions in memory 1502 are executed by processor 1501, the image forming apparatus 1500 is able to perform some or all of the steps in the above method embodiments.

[0200] Corresponding to the above embodiments, this application also provides a computer-readable storage medium, wherein the computer-readable storage medium may store a program, wherein when the program runs, it can control the device where the computer-readable storage medium is located to execute some or all of the steps in the above method embodiments. Specifically, the computer-readable storage medium may be a magnetic disk, an optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0201] Corresponding to the above embodiments, this application also provides a computer program product containing executable instructions that, when executed on a computer, cause the computer to perform some or all of the steps in the above method embodiments.

[0202] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0203] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0204] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0205] In the several embodiments provided in this application, any function, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0206] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A method for detecting anomalies in an image carrier, applied to an image forming apparatus, characterized in that, include: A first voltage value output by the charging detection circuit is obtained. The first voltage value is used to characterize the voltage change state in the charging circuit. The first voltage value is obtained in at least one rotation cycle of the image carrier. Determine whether the first voltage value meets the preset conditions; If the first voltage value meets the preset condition, it is determined that the image carrier is abnormal; The step of determining whether the first voltage value meets the preset condition includes: Determine whether there is a voltage peak in the first voltage value; If there is a voltage peak in the first voltage value, then determine whether the voltage peak meets the preset condition; If the voltage peak value meets the preset condition, then the first voltage value is determined to meet the preset condition; The step of determining whether the voltage peak value meets the preset condition includes: The peak voltage is obtained, and the average value of the peak voltage is taken to obtain the first average voltage. The average of the first voltage value is taken to obtain the second average voltage value; The first average voltage value is proportional to the second average voltage value; Determine whether the result of the ratio calculation meets the set threshold; If the result of the proportional calculation meets the set threshold, then the voltage peak value is determined to meet the preset condition.

2. The detection method according to claim 1, characterized in that, The first voltage value output by the charging detection circuit includes: The first voltage value output by the charging detection circuit in the image forming operation detection stage is obtained. The image forming operation detection stage is the stage of charging detection of the image carrier before or during the execution of the image forming operation.

3. The detection method according to claim 1, characterized in that, The step of obtaining the voltage peak value and averaging the voltage peak value to obtain the first voltage average value includes: Obtain at least two maximum voltage values ​​from the voltage peaks, and average the at least two maximum voltage values ​​to obtain a first average voltage value.

4. The detection method according to claim 1, characterized in that, The step of determining whether the first voltage value meets the preset condition includes: The image carrier detection signal is output based on the first voltage value; The detection signal of the image carrier is detected; When the image carrier detection signal is detected as a target signal, it is determined whether the number of times the target signal is detected is greater than a preset threshold. If the number of times the target signal is detected is greater than a preset threshold, then the first voltage value is determined to meet the preset condition.

5. The detection method according to claim 1, characterized in that, The step of determining whether the first voltage value meets the preset condition includes: The image carrier detection signal is output based on the first voltage value; The image carrier detection signal is sampled and detected; When the image carrier detection signal is detected as a target signal, it is determined whether the number of consecutive samplings that detect the target signal is greater than a preset threshold. If the number of times the target signal is detected by continuous sampling is greater than a preset threshold, then the first voltage value is determined to meet the preset condition.

6. The detection method according to claim 1, characterized in that, The method further includes: If the image carrier malfunctions, the image forming operation is stopped, and the engine control voltage and imaging control voltage are turned off.

7. An image forming apparatus, characterized in that, include: The acquisition unit is used to acquire a first voltage value output by the charging detection circuit. The first voltage value is used to characterize the voltage change state in the charging circuit. The first voltage value is acquired in at least one rotation cycle of the image carrier. A judgment unit is used to determine whether the first voltage value meets a preset condition; The determining unit is used to determine that an abnormality has occurred in the image carrier when the first voltage value meets a preset condition; The device further includes: The first sub-determination unit is used to determine whether there is a voltage peak in the first voltage value; The first sub-judgment unit is used to determine whether the voltage peak value meets the preset condition when there is a voltage peak value in the first voltage value. The second sub-determining unit is used to determine that the first voltage value meets the preset condition when the voltage peak value meets the preset condition; The step of determining whether the voltage peak value meets the preset condition includes: The peak voltage is obtained, and the average value of the peak voltage is taken to obtain the first average voltage. The average of the first voltage value is taken to obtain the second average voltage value; The first average voltage value is proportional to the second average voltage value; Determine whether the result of the ratio calculation meets the set threshold; If the result of the proportional calculation meets the set threshold, then the voltage peak value is determined to meet the preset condition.

8. The image forming apparatus according to claim 7, characterized in that, The device further includes: The output unit is used to output an image carrier detection signal based on the first voltage value; The detection unit is used to detect the detection signal of the image carrier; The second sub-judgment unit is used to determine whether the number of times the target signal is detected is greater than a preset threshold when the image carrier detection signal is detected as a target signal. The third sub-determination unit is used to determine that the first voltage value meets the preset condition when the number of times the target signal is detected is greater than a preset threshold.

9. An image forming apparatus, characterized in that, include: A charging detection circuit is used to detect the voltage change state in the charging circuit of the image carrier and output a first voltage value. The first voltage value is used to characterize the voltage change state of the charging circuit. The first voltage value is obtained in at least one rotation cycle of the image carrier. An image carrier anomaly detection circuit is used to receive a first voltage value output by the charging detection circuit and output an image carrier detection signal based on the first voltage value. The control unit is used to receive the image carrier detection signal and determine whether the image carrier is abnormal based on the image carrier detection signal; The image carrier anomaly detection circuit includes: The first voltage divider filter module has its input terminal electrically connected to the output terminal of the charging detection circuit. The first voltage divider filter module is used to receive the first voltage value output by the charging detection circuit and output a first voltage divider filter signal based on the first voltage value. The second voltage divider filter module has its input terminal electrically connected to the output terminal of the charging detection circuit. The second voltage divider filter module is used to receive the first voltage value output by the charging detection circuit and output a second voltage divider filter signal based on the first voltage value. An operational amplifier is provided, wherein the inverting input terminal of the operational amplifier is electrically connected to the output terminal of the first voltage divider filter module, and the non-inverting input terminal of the operational amplifier is electrically connected to the output terminal of the second voltage divider filter module. The operational amplifier is used to output an operational amplified signal based on the first voltage divider filter signal and the second voltage divider filter signal. A detection signal output module is provided, wherein the input terminal of the detection signal output module is electrically connected to the output terminal of the operational amplifier, and the detection signal output module is used to receive the operational amplifier signal and output the image carrier detection signal based on the operational amplifier signal.

10. The image forming apparatus according to claim 9, characterized in that, The image carrier anomaly detection circuit also includes: The voltage division ratio of the first voltage divider filter module is greater than that of the second voltage divider filter module, and the charging time constant of the first voltage divider filter module is greater than that of the second voltage divider filter module; or, the voltage division ratio of the first voltage divider filter module is less than that of the second voltage divider filter module, and the charging time constant of the first voltage divider filter module is less than that of the second voltage divider filter module.

11. The image forming apparatus according to claim 9, characterized in that, The detection signal output module includes: The first transistor has its control terminal electrically connected to the output terminal of the operational amplifier. The first terminal of the first transistor is electrically connected to the power supply voltage through a resistor. The second terminal of the first transistor is grounded. The first terminal of the first transistor is also electrically connected to the input terminal of the control unit. The first transistor is used to control the image carrier detection signal input to the control unit according to the operational amplifier signal.

12. The image forming apparatus according to any one of claims 9-11, characterized in that, The control unit includes: The input module is used to receive the image carrier detection signal; The detection module is used to detect the detection signal of the image carrier; The judgment module is used to determine whether the number of times the target signal is detected is greater than a preset threshold when the image carrier detection signal is detected as a target signal. The determination module is used to determine that an abnormality has occurred in the image carrier when the number of times the target signal is detected exceeds a preset threshold.

13. The image forming apparatus according to claim 12, characterized in that, The control unit further includes: The control module is used to stop the image forming operation and shut down the engine control voltage and imaging control voltage when the image carrier malfunctions.

14. An image forming apparatus, characterized in that, include: processor; Memory; The memory stores a computer program that, when executed, causes the image forming apparatus to perform the method according to any one of claims 1-6.

15. 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 according to any one of claims 1-6.

Images