CN112462583A

CN112462583A - Image forming apparatus and method for detecting laser scanning unit

Info

Publication number: CN112462583A
Application number: CN202011403578.3A
Authority: CN
Inventors: 李海雄; 焦陇徽
Original assignee: Zhuhai Pantum Electronics Co Ltd
Current assignee: Zhuhai Pantum Electronics Co Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-03-09

Abstract

The invention provides an image forming device and a detection method of a laser scanning unit, comprising a trusted computing supervision unit, an imaging control unit and a laser scanning unit; the trusted computing supervision unit or the imaging control unit is used for acquiring parameters of the laser scanning unit; the trusted computing supervision unit or the imaging control unit is used for measuring the parameters of the laser scanning unit based on a preset algorithm to generate a target measurement value; the trusted computing and monitoring unit is used for comparing the target metric value with a preset metric value to generate a comparison result, and judging whether the laser scanning unit is trusted according to the comparison result. The image forming device can effectively detect whether the laser scanning unit meets the requirements, avoid the laser scanning unit which does not meet the requirements from continuously operating, and ensure the safety of parts in the image forming device and the effective and reliable image formed by the image forming device.

Description

Image forming apparatus and method for detecting laser scanning unit

[ technical field ] A method for producing a semiconductor device

The present invention relates to the field of image forming technology, and more particularly, to an image forming apparatus and a method for detecting a laser scanning unit.

[ background of the invention ]

An image forming apparatus generally includes an image forming control Unit, a Laser Scanning Unit (LSU), and a photosensitive drum. The image forming control unit controls the laser scanning unit to scan the surface of the photosensitive drum so as to control the image formation, so that the reliability of the laser scanning unit, which is a key component of the image forming apparatus, is very important for the image forming quality, and the mounting of the unsatisfactory LSU on the image forming apparatus may affect the image forming quality, and even may damage the components in the image forming apparatus, which may cause inconvenience to the user.

However, a detection scheme capable of detecting whether or not an LSU mounted on an image forming apparatus satisfies a requirement is lacking in the related art.

[ summary of the invention ]

The invention provides an image forming apparatus and a detection method of a laser scanning unit, aiming to solve the problem that a detection scheme capable of detecting whether an LSU installed on the image forming apparatus meets requirements is lacked in the prior art.

A detection method of a laser scanning unit is applied to an image forming apparatus, and comprises the following steps:

acquiring parameters of a laser scanning unit;

measuring 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;

and judging whether the laser scanning unit is credible according to the comparison result.

Preferably, the parameter of the laser scanning unit comprises a characteristic parameter of the laser scanning unit.

Preferably, the parameter of the laser scanning unit includes one or more of an initialization timing parameter, a scanning timing parameter and a printing timing parameter of the laser scanning unit.

Preferably, the parameters of the laser scanning unit include a time parameter and a distance parameter; the method further comprises the following steps:

and converting the distance parameter into a time parameter or converting the time parameter into a distance parameter.

Preferably, the method further comprises:

and when the laser scanning unit is not trusted, controlling the laser scanning unit to stop running.

An image forming apparatus includes a trusted computing supervision unit, an imaging control unit and a laser scanning unit;

the trusted computing supervision unit or the imaging control unit is used for acquiring parameters of the laser scanning unit;

the trusted computing supervision unit or the imaging control unit is used for measuring the parameters of the laser scanning unit based on a preset algorithm to generate a target measurement value;

the trusted computing and supervising unit is used for comparing the target metric value with a preset metric value to generate a comparison result, and judging whether the laser scanning unit is trusted according to the comparison result.

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.

Preferably, when the laser scanning unit is not trusted, the imaging control unit is further configured to control the laser scanning unit to stop operating.

A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, implements the detection method of a laser scanning unit as described above.

An image forming apparatus includes:

a processor and a memory for storing at least one instruction which is loaded and executed by the processor to implement the detection method of the laser scanning unit as described above.

According to the detection method of the laser scanning unit, provided by the embodiment of the invention, the parameters of the laser scanning unit are obtained, the parameters of the laser scanning unit are measured based on a preset algorithm to generate a target measurement value, the target measurement value is compared with the preset measurement value to generate a comparison result, and whether the laser scanning unit is credible is judged according to the comparison result, so that whether the laser scanning unit meets the requirements can be effectively detected, the laser scanning unit which does not meet the requirements is prevented from continuously running, and the safety of parts in an image forming device and the formation of effective and reliable images by the image forming device are ensured.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present application;

FIG. 2 is a schematic view of an image forming apparatus according to another embodiment of the present application;

FIG. 3 is a timing chart of an initialization of an image forming apparatus according to an embodiment of the present application;

FIG. 4 is a timing diagram of scanning of an image forming apparatus according to an embodiment of the present application;

fig. 5 is a flowchart illustrating a detection method of a laser scanning unit according to an embodiment of the present disclosure.

[ detailed description ] embodiments

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Example one

Referring to fig. 1, the embodiment provides an image forming apparatus including an image forming control unit 100, an LSU200, and a photosensitive drum (OPC) 101 a.

Among them, the image forming apparatus is used to perform image forming jobs such as generating, printing, receiving, and transmitting image data, and examples of the image forming apparatus include: an inkjet printer, a laser printer, an LED (Light Emitting Diode) printer, a copier, a scanner, or a multifunction Peripheral (MFP) that performs the above functions in a single device.

The image forming control unit 100 is for controlling an image forming process operation of the image forming apparatus. Specifically, the imaging control unit 100 is configured to perform processing operations related to data transceiving, command transceiving, and engine control, for example, how to transceive data, commands, statuses, and the like by calling an interface unit (including but not limited to a USB port, a wired network port, a wireless network port, and the like) through an application program, and may further obtain received printing parameters through the application program and resolve the received printing parameters into commands for controlling the engine mechanism to perform specific functions, such as pickup roller rotation parameters and the like; in addition, for an image forming apparatus having a user authority authentication or encryption/decryption processing function, the imaging control unit 100 is also configured to be able to perform the user authority authentication or encryption/decryption processing function; the interface unit in the image forming apparatus is also capable of receiving print job data and print, scan, and fax commands from the driving apparatus, or transmitting scan, fax data, print, scan, and fax status information, etc. The photosensitive drum 101a is generally cylindrical, and the LSU200 may scan the surface of the photosensitive drum 101a in a main scanning direction and a sub-scanning direction, wherein the main scanning direction may be an axial direction of the photosensitive drum 101a (direction B shown in fig. 1), and the sub-scanning direction may be a circumferential direction of a cross section of the photosensitive drum 101a (direction a shown in fig. 1).

In fig. 1, the LSU200 may include a Laser Diode (LD) 201, an LD driver 2 for controlling light emission of the LD, a collimating lens 202, a grating 203, a cylindrical lens 204, a polygon mirror 205, a curved lens 207, a diffractive optical element 208, a motor 206 for driving the polygon 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 polygon mirror 205 includes a plurality of reflection surfaces, and a laser beam emitted from the LD 201 reaches a certain reflection surface of the polygon mirror 205 through the collimator lens 202, the grating 203, and the cylindrical lens 204 in this order, is reflected by the reflection surface, and reaches the surface of the photosensitive drum 101a through the curved lens 207 and the diffractive optical element 208 in this order to form an electrostatic latent image.

Among them, the collimator lens 202 may be used to convert the laser beam emitted from the LD 201 into parallel light, and the grating 203 may 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, the major axis of the elliptical image being located in the main scanning direction described above.

The polygon mirror 205 can be rotated in a specific direction, for example, in a direction C shown in fig. 1, by the driving of the motor 206. As the polygon mirror 205 rotates, the incident angle of the laser beam on the reflection surface of the polygon mirror 205 changes constantly, and accordingly, the incident position of the light beam reflected to the surface of the photosensitive drum 101a via the reflection surface of the polygon mirror 205 moves in the main scanning direction, thereby realizing scanning in the main scanning direction, that is: and (4) line scanning. In fig. 1, the laser beam can scan from one end to the other end of the photosensitive drum in the main scanning direction, i.e., one line scan is completed, per rotation of the polygon mirror 205 by one reflection surface. Further, the photosensitive drum 101a is rotated by a driving unit 211 so that the light beam can move in the sub-scanning direction.

The LSU200 may also include a Beam Detector 209 and a mirror 210. The position where the reflecting mirror 210 is disposed corresponds to a specific position on each reflecting surface of the polygon mirror 205, and when a laser beam is incident to the specific position of any one of the reflecting surfaces of the polygon mirror 205, the beam reflected by the reflecting surface of the polygon mirror 205 will be able to be received by the reflecting mirror 210. The mirror 210 reflects the received light beam to the beam detector 209 again, and the beam detector 209 transmits a start scanning signal, which is generally called a line synchronization signal, to the imaging control unit 100 when detecting the light beam.

Example two

Referring to fig. 2, the image forming apparatus further includes a trusted computing supervision unit 300, configured to monitor an operation activity corresponding to the imaging control unit 100 in the image forming apparatus; trusted Computing (Trusted Computing) in the Trusted Computing supervision module is used for behavior security, and is widely used in computers and communication systems to improve the security of the whole system. Information security includes four aspects: equipment safety, data safety, content safety and behavior safety; in order to improve the information security characteristics of the image forming apparatus, the present embodiment introduces a trusted computing function.

The trusted computing supervision unit 300 or the imaging control unit 100 is used to acquire parameters of the laser scanning unit 200. The trusted computing supervision unit 300 or the imaging control unit 100 is configured to measure 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 metric value with a preset metric value, generate a comparison result, and determine whether the laser scanning unit 200 is trusted according to the comparison result.

The parameters of the laser scanning unit 200 can be acquired by the imaging control unit 100 and also by the trusted computing supervision unit 300. When the parameters of the laser scanning unit 200 are acquired by the imaging control unit 100, 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. When the parameters of the laser scanning unit 200 are acquired by the trusted computing supervision unit 300, the trusted computing supervision unit 300 is configured to measure the parameters of the laser scanning unit 200 based on a preset algorithm, and generate a target measurement value. When the parameters of the laser scanning unit 200 are acquired by the trusted computing and supervising unit 300, it may be that the imaging control unit 100 directly acquires the parameters of the laser scanning unit 200, and the trusted computing and supervising unit 300 then indirectly acquires the parameters of the laser scanning unit 200 through the imaging control unit 100.

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, and when the measurement result of the characteristic parameters of the laser scanning unit 200 is not trusted, the starting operation of the laser scanning unit 200 is not executed, so that the image forming quality of the image forming apparatus is prevented from being influenced or the parts in the image forming apparatus are prevented from being damaged.

The characteristic parameter of the laser scanning unit 200 is an intrinsic parameter of the laser scanning unit 200, which does not change with whether the laser scanning unit 200 is activated or not. The characteristic parameters of the laser scanning unit 200 include a first type of characteristic parameter and a second type of characteristic parameter. The first kind of characteristic parameters include LD type, resolution, number of motor mirrors, scan width, 1 line scan angle, 1 line effective scan angle, OPC linear velocity, or other types of parameters. The second type of characteristic parameters include polygon motor rotation speed, 1 line scanning time, 1 line effective scanning utilization rate, 1 line effective scanning time, 1 pixel exposure time, image frequency (video), or other types of parameters.

The trusted computing supervision unit 300 may comprise a trusted chip for storing the preset metric value. The preset algorithm may be a hash (hash function) algorithm or other algorithm. The hash algorithm can improve the utilization rate of the storage space of the trusted computing supervision unit 300, improve the query efficiency of data, and also can be used for making a digital signature to guarantee the safety of data transmission. The Hash Algorithm includes MD5(MD5 Message-Digest Algorithm) information Digest Algorithm, SHA-1(Secure Hash Algorithm 1), RipemD-160, SHA-256, SHA-512, and the like.

The trusted computing supervision unit 300 may measure the characteristic parameters of the laser scanning unit 200 as a whole by using a hash algorithm to obtain a first hash metric value, and then compare the first hash metric value with a first preset metric value. The trusted computing supervision unit 300 may also measure part of the characteristic parameters, which may be all of the first characteristic parameters, part of the first characteristic parameters, all of the second characteristic parameters, part of the second characteristic parameters, or a combination of part of the first characteristic parameters and part of the second characteristic parameters. The trusted computing supervision unit 300 measures a part of the parameters in the characteristic parameters by using a hash algorithm to obtain a second hash metric value, and then compares the second hash metric value with a second preset metric value, which needs to be described that at least 2 parameters are measured to obtain a measurement result when the parameters are measured.

In an application scenario, before the laser scanning unit 200 is started, the trusted computing and monitoring unit 300 obtains the characteristic parameters of the laser scanning unit 200, and the trusted computing and monitoring unit 300 performs hash measurement on all the characteristic parameters of the laser scanning unit 200 based on a hash algorithm to generate a target measurement value, and stores the target measurement value in a trusted chip. And when the trusted chip executes the trusted code, comparing the target metric value with a preset metric value to generate a comparison result. The credible chip judges whether the laser scanning unit 200 is credible according to the comparison result. When the target metric value is consistent with the preset metric value, the comparison result is credible; and when the target metric value is inconsistent with the preset metric value, the comparison result is not credible. When the trusted chip determines that the laser scanning unit 200 is not trusted according to the comparison result, the trusted chip notifies the trusted computing and supervising unit 300 of the untrusted result of the laser scanning unit 200, the trusted computing and supervising unit 300 may upload the untrusted result of the laser scanning unit 200 to the imaging control unit 100, the imaging control unit 100 may notify the user that the laser scanning unit 200 is not trusted in a display manner, and at the same time, the imaging control unit 100 rejects the request for starting the laser scanning unit 200, thereby avoiding affecting the image forming quality of the image forming apparatus or avoiding damaging parts in the image forming apparatus. The imaging control unit 100 may also be connected to a terminal device through a network or a USB (Universal Serial Bus), and the imaging control unit 100 may also notify the terminal that the laser scanning unit 200 is not trusted through the network or the USB, and a user obtains information that the laser scanning unit 200 is not trusted through the terminal device, where the terminal device may be a personal computer, a smart phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted computer, or other mobile terminal devices with a wireless communication function.

EXAMPLE III

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.

The parameters of the laser scanning unit 200 include a time parameter and a distance parameter, specifically, the initialization timing sequence parameter of the laser scanning unit 200 includes a first time parameter and a first distance parameter, and of course, the initialization timing sequence parameter 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, and the printing timing parameters of the laser scanning unit 200 include a third time parameter and a third distance parameter, and 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.

Different from the characteristic parameters of the laser scanning unit 200, the initialization timing parameter, the scanning timing parameter, and the printing timing parameter of the laser scanning unit 200 have different parameter ranges corresponding to different application scenarios, that is, the initialization timing parameter, the scanning timing parameter, and the printing timing parameter of the laser scanning unit 200 can be adjusted in different application scenarios of the laser scanning unit 200. Although the initialization timing sequence parameter, the scanning timing sequence parameter and the printing timing sequence parameter of the laser scanning unit 200 have different parameter ranges corresponding to different application scenes, the trusted computing and monitoring unit 300 or the imaging control unit 100 measures the boundary value or the threshold value of the parameter range of the initialization timing sequence parameter, the scanning timing sequence parameter or the printing timing sequence parameter of the laser scanning unit 200 to obtain a target measurement value, the trusted computing and monitoring unit 300 then judges whether the target measurement value is within the preset parameter range, and if the target measurement value is within the preset parameter range, the laser scanning unit 200 is trusted.

The trusted chip stores preset measurement values (preset parameter ranges) corresponding to different application scenarios, and the trusted computing supervision unit 300 may determine an operation scenario of the laser scanning unit 200 according to the acquired initialization timing sequence parameter, scanning timing sequence parameter, and printing timing sequence parameter of the laser scanning unit 200, so as to call the corresponding preset measurement value (preset parameter range) to compare with the target measurement value after measuring the initialization timing sequence parameter, scanning timing sequence parameter, and printing timing sequence parameter of the laser scanning unit 200 based on a preset algorithm.

Most of the initialization timing parameter, the scanning timing parameter, and the printing timing parameter 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 parameter into a time parameter, and then measure the converted time parameter and a time parameter that does not need to be converted by using a preset algorithm, or the trusted computing supervision unit 300 or the imaging control unit 100 further converts the time parameter into a distance parameter, and then measure the converted distance parameter and the distance parameter that does not need to be converted by using a preset algorithm, or the trusted computing supervision unit 300 or the imaging control unit 100 directly measures the acquired initialization timing parameter, scanning timing parameter, and printing timing parameter of the laser scanning unit 200 without converting the time parameter and the distance parameter.

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, so that the trusted computing supervision unit 300 can conveniently measure the initialization timing sequence parameter, the scanning timing sequence parameter and the printing timing sequence parameter of the laser scanning unit 200, and the height measurement efficiency is improved.

The trusted computing supervision unit 300 may measure the same group of time parameters or the same group of distance parameters or the same group of time parameters and distance parameters by using different preset algorithms, but each group of parameters and preset algorithms corresponds to a preset metric value one by one, for example, the trusted computing supervision unit 300 measures a group of time parameters by using a preset algorithm a to obtain a target metric value a, and compares the target metric value a with a preset metric value a1, thereby determining whether the laser scanning unit 200 is trusted; the trusted computing supervision unit 300 may further measure the set of time parameters by using a preset algorithm B to obtain a target metric value B, and compare the target metric value B with a preset metric value B1, so as to determine whether the laser scanning unit 200 is trusted. The trusted computing supervision unit 300 or the imaging control unit 100 may select a suitable algorithm to measure the initialization timing parameter, the scanning timing parameter, and the printing timing parameter of the laser scanning unit 200 according to actual measurement requirements, so as to improve the accuracy of measurement and the efficiency of measurement.

The trusted computing supervision unit 300 may select a suitable algorithm to measure the initialization timing parameter of the laser scanning unit 200 according to actual measurement requirements, and referring to fig. 3, in an application scenario, when the image forming apparatus is a color printer, in an initialization process of the color printer, the color printer performs the following specific steps:

the first step is as follows: the LSU receives a START signal;

the second step is that: the motor of the LSU reaches a steady state within time T1, and the LSU feeds back the Ready signal to the imaging control unit 100.

The third step: the LD is started.

The starting signal of the LD is LD enable. The LD needs to be started within time T2 after the motor of the LSU reaches stability.

The fourth step: and generating an optical power correction signal S/H, and correcting the optical power through the optical power correction signal S/H.

The optical power correction signal S/H is generated during time T3 after the LD starts. After laser exposure, the process of laser light attenuation exists, in the initialization stage, after the optical power correction signal S/H is generated, the charging process is carried out, the charging time is longer than the time T4, then the optical power is corrected, and the time of the optical power correction process is shorter than the time T5.

Too high optical power may result in a darker image being formed, and too low optical power may result in a lighter image being formed, and thus, the optical power needs to be corrected.

DATA _ P and DATA _ N in fig. 3 are image signals, and DATA _ P and DATA _ N are differential signals, which are generated in the exposure phase. Laser Driver is a Laser drive signal and corrects the light receiving power correction signal S/H.

That is, the initialization timing parameter shown in fig. 3 is a time parameter, including T1, T2, T3, T4, and T5, the trusted computing and supervising unit 300 may measure an entire or a part of the time parameter in the initialization timing of the color printer, and compare the measurement result with a preset measurement result to determine whether the laser scanning unit 200 is trusted, for example, the trusted computing and supervising unit 300 may measure the entire of T1, T2, T3, T4, and T5 according to a preset algorithm to obtain a measurement result C1, and then compare C1 with a preset measurement result C2 stored in the trusted computing and supervising unit 300 to determine whether the laser scanning unit 200 is trusted; of course, the trusted computing supervision unit 300 may measure some parameters, for example, T1 and T2, in T1, T2, T3, T4 and T5 according to a preset algorithm to obtain a measurement result D1, and then compare D1 with a preset measurement result D2 stored in the trusted computing supervision unit 300 to determine whether the laser scanning unit 200 is trusted. It should be added that, when the initialization timing parameter is measured, measurement may be performed multiple times, for example, measurement of the whole parameter and measurement of a part of the whole parameter are performed simultaneously, and this is not limited herein.

By measuring the initialization timing sequence parameters of the laser scanning unit 200 at the initialization stage of the laser scanning unit 200, it is ensured that each functional module of the laser scanning unit 200 can be started within a preset starting time range, thereby ensuring correct initialization of the laser scanning unit 200 to generate an effective and reliable image.

The trusted computing supervision unit 300 may also select a suitable algorithm to measure the scanning timing parameter of the laser scanning unit 200 according to actual measurement requirements, referring to fig. 4, in another application scenario, when the image forming apparatus is a black and white printer, the black and white printer performs a scanning operation after initialization, and in a scanning stage, the signal timing of the black and white printer is as follows:

the first step is as follows: the LSU generates a row sync signal Hsync. The black and white printer starts scanning.

The second step is that: the LSU generates an image signal video.

The period T0 is a line scanning time, the period T11 is a time for controlling the margin on the left side of the scanning area, and the period T21 is a time for controlling the effective scanning area.

The third step: a scanning optical power correction signal S/H is generated.

Stage T31 is the time interval after the generation of the line synchronizing signal Hsync until the generation of the scanning optical power correction signal S/H.

The scanning optical power correction signal S/H is an optical power correction signal generated in a scanning stage, which controls an optical power that must be in a non-scanning area, otherwise, an optical power abnormality is caused, resulting in an image forming abnormality (deep or shallow).

The fourth step: the Beam Detector (BD) is activated.

The start signal BD enable of the beam detector is generated at a timing when the control line sync is generated.

That is, the scan timing parameters shown in fig. 4 are time parameters, including T0, T11, T21, and T31, the trusted computing and supervising unit 300 may measure the whole or part of the time parameters in the initialization timing of the color printer, and compare the measurement result with the preset measurement result to determine whether the laser scanning unit 200 is trusted, for example, the trusted computing and supervising unit 300 may measure the whole of T0, T11, T21, and T31 according to the preset algorithm to obtain a measurement result E1, and then compare E1 with the preset measurement result E2 stored in the trusted computing and supervising unit 300 to determine whether the laser scanning unit 200 is trusted; of course, the trusted computing supervision unit 300 may measure some parameters in 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 a preset measurement result F2 stored in the trusted computing supervision unit 300, so as to determine whether the laser scanning unit 200 is trusted.

It should be noted that, when the measurement is performed on the scan timing parameter, the measurement may be performed multiple times, for example, the measurement on the whole parameter and the measurement on a part of the whole parameter are performed simultaneously, which is not limited herein.

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 normally operate during the scanning phase to form an effective and reliable image.

The printing timing parameters of the laser scanning unit 200 include a first type of printing timing parameters and a second type of printing timing parameters. The first type of printing timing parameters includes OPC pitch and 1 line scan time. The trusted computing supervisor unit 300 or the imaging control unit 100 may convert the OPC spacing into a time parameter, thereby facilitating the metrics of the trusted computing supervisor unit 300. When the image forming device is a black-white printer, the second type of printing time sequence parameters comprise the time for starting imaging by using the powder box; when the image forming apparatus is a color printer, the second type of printing timing parameters includes a time for starting imaging by using each color (cyan, magenta, yellow, and black) cartridge and a time interval for starting imaging by using 2 cartridges of each color cartridge, for example, the sequence of the cartridges is yellow cartridge, cyan cartridge, magenta cartridge, and black cartridge, and the time intervals include a time interval between starting using the yellow cartridge and the cyan cartridge, a time interval between starting using the cyan cartridge and the magenta cartridge, a time interval between starting using the magenta cartridge and the black cartridge, and the like.

When the trusted computing supervision unit 300 measures the printing timing parameters of the laser scanning unit 200, the OPC intervals can be converted into time parameters, thereby facilitating the measurement of the trusted computing supervision unit 300. All the printing timing parameters can be measured integrally to obtain a measurement result P1, and then P1 is compared with a preset measurement result P2 stored in the trusted computing supervision unit 300, so as to determine whether the laser scanning unit 200 is trusted; the trusted computing supervision unit 300 may also measure a part of the first type of timing parameter and the second type of timing parameter, and then compare the measured value with a preset measurement result stored in the trusted computing supervision unit 300, so as to determine whether the laser scanning unit 200 is trusted.

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 the respective functional modules of the laser scanning unit 200 can normally perform the printing operation to generate an effective and reliable image.

It should be noted that in the embodiment of the present invention, when determining whether the laser scanning unit 200 is authentic, one or more of the authentic measurement of the initialization timing parameter, the authentic measurement of the scanning timing parameter, and the authentic measurement of the printing timing parameter may be executed. When the trusted computing supervision unit 300 determines that the laser scanning unit 200 is not trusted according to the comparison result, the imaging control unit 100 is further configured to control the laser scanning unit 200 to stop operating. In the initialization process of the laser scanning unit 200, if the laser scanning unit 200 is judged to be unreliable, the initialization of the laser scanning unit 200 is stopped; in the scanning process of the laser scanning unit 200, if the laser scanning unit 200 is determined to be unreliable, controlling the laser scanning unit 200 to stop scanning; during the printing process of the laser scanning unit 200, if the laser scanning unit 200 is determined to be not authentic, the laser scanning unit 200 is controlled to stop the printing operation.

According to the image forming device, the trusted computing and monitoring unit 300 or the imaging control unit 100 is used for obtaining the parameters of the laser scanning unit 200, the trusted computing and monitoring unit 300 or the imaging control unit 100 is used for measuring the parameters of the laser scanning unit 200 based on a preset algorithm to generate a target measurement value, the trusted computing and monitoring unit 300 is used for comparing the target measurement value with the preset measurement value to generate a comparison result, and judging whether the laser scanning unit 200 is trusted according to the comparison result, so that whether the laser scanning unit 200 meets requirements can be effectively detected, the situation that the laser scanning unit 200 which does not meet the requirements continues to operate is avoided, and the safety of parts in the image forming device and the fact that the image forming device forms effective and reliable images are guaranteed.

Example four

Referring to fig. 5, an embodiment of the invention further provides a method for detecting a laser scanning unit, which is applied to an image forming apparatus, and the method includes the following steps:

in step S01, parameters of the laser scanning unit are acquired.

And step S02, measuring the parameters of the laser scanning unit based on a preset algorithm to generate a target measurement value.

And step S03, comparing the target metric value with a preset metric value to generate a comparison result.

And step S04, judging whether the laser scanning unit is authentic according to the comparison result.

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

In one embodiment, the predetermined algorithm is a hash algorithm.

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.

In one embodiment, the parameters of the laser scanning unit include a time parameter and a distance parameter. The method further comprises the following steps: converting the distance parameter into a time parameter or converting the time parameter into the distance parameter.

In one embodiment, the method further includes: and when the laser scanning unit is not trusted, controlling the laser scanning unit to stop running.

According to the detection method of the laser scanning unit, the parameters of the laser scanning unit are obtained, the parameters of the laser scanning unit are measured based on the preset algorithm to generate the target measurement value, the target measurement value is compared with the preset measurement value to generate the comparison result, and whether the laser scanning unit is credible or not is judged according to the comparison result, so that whether the laser scanning unit meets the requirements or not can be effectively detected, the laser scanning unit which does not meet the requirements is prevented from continuously operating, and the safety of parts in an image forming device and the formation of effective and reliable images by the image forming device are guaranteed.

EXAMPLE five

The embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the detection method of the laser scanning unit, and the execution manner and the beneficial effects thereof are similar, and are not described herein again.

The embodiment provides an image forming apparatus, which includes a processor and a memory, where the memory is used to store at least one instruction, and the instruction is loaded and executed by the processor to implement the detection method of the laser scanning unit described above, and the execution manner and the beneficial effects are similar, and are not described herein again.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A detection method of a laser scanning unit is applied to an image forming device, and is characterized by comprising the following steps:

acquiring parameters of a laser scanning unit;

2. The method of claim 1, wherein the parameters of the laser scanning unit comprise characteristic parameters of the laser scanning unit.

3. The method of claim 1, wherein 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.

4. The method of claim 1, wherein the parameters of the laser scanning unit include a time parameter and a distance parameter; the method further comprises the following steps:

5. The method of claim 1, further comprising:

6. An image forming apparatus is characterized by comprising a trusted computing supervision unit, an imaging control unit and a laser scanning unit;

7. The image forming apparatus according to claim 6, wherein the parameter of the laser scanning unit includes a characteristic parameter of the laser scanning unit.

8. The image forming apparatus according to claim 6, wherein the parameters of the laser scanning unit include one or more of an initialization timing parameter, a scanning timing parameter, and a printing timing parameter of the laser scanning unit.

9. The image forming apparatus according to claim 6, wherein 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.

10. The image forming apparatus according to claim 6, wherein the image formation control unit is further configured to control the laser scanning unit to stop operating when the laser scanning unit is not trusted.

11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of detection of a laser scanning unit according to any one of claims 1 to 5.

12. An image forming apparatus, comprising:

a processor and a memory for storing at least one instruction which is loaded and executed by the processor to implement the method of detection of a laser scanning unit according to any of claims 1 to 5.