A method of inspecting optical diffusion film particle drop and a rubbing tester

Abstract

The application provides a method for detecting particle drop of an optical diffusion film and a rubbing testing machine. The method comprises the following steps: rubbing a detection tool with a surface of the diffusion film to be detected; and observing whether the surface of the diffusion film to be detected has a particle drop defect. The technical scheme can detect the bonding strength of the particles of the diffusion film, and guarantees the quality of a backlight module and an electronic product.

Description

Technical Field

[0001] This invention relates to the field of diffusion film testing technology, and in particular to a method for testing particle shedding in optical diffusion films and a friction testing machine. Background Technology

[0002] Optical diffusion films are mainly formed by uniformly coating a resin and high-refractive-index microspheres (materials such as PMMA, PS, silicone, Teflon, and polyurethane) onto the surface of polyethylene terephthalate (PET). Currently, the testing of optical diffusion films involves cutting six parallel lines (vertical and horizontal) on a prepared test plate with a cutting tool, applying transparent tape to the cut edges of the coating, and then uniformly removing the tape to inspect for damage to the cut coating. This testing method only measures the adhesion of the coating (the bond between the coating and the substrate) and cannot determine the adhesion of the particles. Furthermore, the bonding effect of microspheres of different materials in the resin varies. If the adhesion of the particles is insufficient, particle detachment is likely to occur during use or subsequent mechanical testing, directly affecting the quality of backlight modules and electronic products. Summary of the Invention

[0003] The main objective of this invention is to provide a method and a friction tester for inspecting the detachment of optical diffusion film particles, aiming to detect the adhesion strength of the diffusion film particles and ensure the quality of backlight modules and electronic products.

[0004] To achieve the above objectives, the present invention proposes a method for inspecting the shedding of particles from an optical diffusion film, the method comprising the following steps:

[0005] The detector is rubbed against the surface of the diffusion film to be tested.

[0006] Observe whether there are particle shedding defects on the surface of the diffusion film to be inspected.

[0007] In one embodiment of the present invention, the step of rubbing the detector device against the surface of the diffusion film to be tested includes:

[0008] Fix the detection device;

[0009] The diffusion film to be tested is rubbed against the friction surface of the testing instrument a preset number of times.

[0010] In one embodiment of the present invention, in the step of rubbing the diffusion film to be tested on the friction surface of the testing instrument a preset number of times, the preset number of times is defined as n, and n≥5 times.

[0011] In one embodiment of the present invention, before the step of rubbing the diffusion film to be tested against the friction surface of the testing instrument a predetermined number of times, the method further includes:

[0012] The diffusion film to be tested is pressed onto the friction surface of the testing device under a preset pressure.

[0013] In one embodiment of the present invention, in the step of pressing the diffusion membrane to be tested onto the friction surface of the detector with a preset pressure, the preset pressure is defined as g, and satisfies g≥100G.

[0014] In one embodiment of the present invention, the detection instrument is a PC board;

[0015] And / or, the friction surface of the detector has a plurality of rhomboid protrusions arranged side by side.

[0016] The present invention also proposes a friction testing machine, which can realize the method for inspecting the shedding of particles from an optical diffusion film as described in any of the preceding claims, the friction testing machine comprising:

[0017] Friction platform, wherein the friction platform is provided with friction surfaces; and

[0018] The pressure-applying component has a film-coated surface disposed opposite to the friction surface, and is translatably disposed relative to the friction surface along the plane direction of the friction surface.

[0019] In one embodiment of the present invention, the friction testing machine further includes a translation mechanism, which is provided with a cantilever.

[0020] The pressure-applying member is inserted through the cantilever and is movably disposed relative to the cantilever to move closer to or further away from the friction surface.

[0021] In one embodiment of the present invention, the cantilever is provided with a screw hole, and the outer surface of the pressure-applying member is provided with an external thread. The pressure-applying member is movably inserted into the cantilever through the mating shell of the external thread and the screw hole.

[0022] In one embodiment of the present invention, the friction platform includes a platform body and a PC plate, the PC plate is fixed to the surface of the platform body, and one side surface of the PC plate forms the friction surface;

[0023] And / or, the friction surface has a plurality of rhomboid protrusions arranged side by side.

[0024] The technical solution of this invention involves conducting a friction test on the diffusion film to simulate the friction between the diffusion film and the internal components of the electronic product during mechanical testing or use after assembly. This test detects the adhesion of particles on the diffusion film and determines whether the particles are easily detached. After such testing, diffusion films with particles that are not easily detached can be selected for use in LCD backlights and electronic products, thereby ensuring the quality of LCD backlights and electronic products. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a flowchart of the first embodiment of the method for detecting particle shedding from an optical diffusion film according to the present invention;

[0027] Figure 2 This is a flowchart of a second embodiment of the method for detecting particle shedding from an optical diffusion film according to the present invention;

[0028] Figure 3 This is a flowchart of the third embodiment of the method for detecting particle shedding from the optical diffusion film according to the present invention;

[0029] Figure 4 This is a flowchart of the fourth embodiment of the method for detecting particle shedding from the optical diffusion film according to the present invention;

[0030] Figure 5 This is a flowchart of the fifth embodiment of the method for detecting particle shedding from the optical diffusion film according to the present invention;

[0031] Figure 6 This is a structural diagram of an embodiment of the friction testing machine of the present invention.

[0032] Explanation of icon numbers:

[0033]

[0034]

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0040] This invention proposes a method for detecting particle shedding from optical diffusion films.

[0041] Please refer to Figure 1 In some embodiments of the method for detecting particle shedding of the optical diffusion film according to the present invention, the method includes the following steps:

[0042] Step S10: Rub the detector against the surface of the diffusion film to be tested.

[0043] Step S30: Observe whether there are particle shedding defects on the surface of the diffusion film to be inspected.

[0044] This application proposes a testing method for detecting whether the particles in an optical diffusion film are prone to detachment. It is understood that optical diffusion films, used in backlight modules and electronic products, primarily function to correct the diffusion angle, thereby increasing the light radiation area. Typically, the basic structure of an optical diffusion film consists of a coating formed by mixing light-diffusing particles and resin on both surfaces of a transparent substrate. After the diffusion film is assembled into the backlight module and electronic product, mechanical tests such as drop tests or simulated transportation vibration tests are required. During these tests or when the electronic product is used by the user, the optical diffusion film will rub against other components in the electronic product or backlight module. If the adhesion of the light-diffusing particles on the diffusion film is poor, it can easily lead to particle detachment, affecting the diffusion effect of the film on the light angle.

[0045] The method for testing particle shedding of optical diffusion films proposed in this application involves simulating a scenario where the diffusion film rubs against other objects before it is assembled and used, thereby detecting whether particles on the diffusion film are easily shed during friction. Specifically, the diffusion film to be tested is rubbed against the testing device. This can be done by fixing the diffusion film to be tested and rubbing it against the testing device, or by fixing the testing device and rubbing the diffusion film to be tested against the friction surface 131 of the testing device. Alternatively, the testing device and the diffusion film to be tested can be moved separately to rub against each other. The testing device can be any tool, or it can be a component that may rub against the diffusion film, selected based on the installation environment of the diffusion film. No limitation is made here. After the diffusion membrane under test is rubbed against the testing instrument, the presence of particle detachment defects on the surface of the diffusion membrane is detected. Understandably, when particles detach from the diffusion membrane surface, pits will appear at the detachment locations. At this point, it can be determined that the adhesion of particles on the diffusion membrane surface is insufficient, making them prone to detachment. Of course, since the particles on the diffusion membrane are all at the microparticle level, tools such as microscopes are needed for auxiliary observation. Alternatively, the presence of detached particles on the testing instrument can be used to determine whether the diffusion membrane has a particle detachment problem. However, since the particles are small and the friction surface 131 on the testing instrument is large, it is inconvenient to find particles on the testing instrument.

[0046] Therefore, it is understandable that the technical solution of the present invention simulates the friction between the diffusion film and the internal components of the electronic product during mechanical testing or use after the diffusion film is assembled into the electronic product. This allows for the detection of particle adhesion on the diffusion film and the determination of whether the particles are easily detached. After such testing, diffusion films with particles that are not easily detached can be selected for use in LCD backlights and electronic products, thereby ensuring the quality of LCD backlights and electronic products.

[0047] Please refer to Figure 2In some embodiments of the method for detecting particle shedding from an optical diffusion film according to the present invention, the step of rubbing the detector against the surface of the diffusion film to be tested includes:

[0048] Step S11: Fix the detector;

[0049] Step S13: The diffusion film to be tested is rubbed on the friction surface 131 of the testing instrument a preset number of times.

[0050] Understandably, this application simulates the scenario of friction on the diffusion membrane to determine whether the particles on the diffusion membrane are easy to detach. However, if the number of frictions is insufficient, the test results may be inaccurate. If the number of frictions is too high, problems such as heat generation or fatigue may occur, leading to particle detachment. This does not meet the actual use scenario and affects the test results. In addition, for different diffusion membranes, if the number of frictions in the test is inconsistent and there are other interfering factors, it is difficult to determine the specific reason for particle detachment.

[0051] In this embodiment, a fixed testing instrument is used. The diffusion film to be tested is rubbed on the friction surface 131 of the testing instrument. For diffusion films of the same batch or type, the rubbing positions of different diffusion films on the testing instrument are consistent, and the number of rubbing cycles is limited. This ensures consistent testing conditions for different diffusion films, making the test data more accurate and reliable, and more accurately identifying unqualified diffusion films, thus guaranteeing the quality of electronic products and backlight modules. Furthermore, for different types of diffusion films, such as different coating thicknesses, substrate hardness, or materials, different number of rubbing cycles or different testing instruments can be set, which is not limited here.

[0052] Please refer to Figure 3 In some embodiments of the method for testing the shedding of optical diffusion film particles according to the present invention, in the step of rubbing the diffusion film to be tested on the friction surface 131 of the testing instrument a preset number of times, the preset number of times is defined as n, and n≥5 times.

[0053] Understandably, when electronic products undergo mechanical testing or are used by users, the diffusion film under test needs to be subjected to multiple frictions and vibrations. In this embodiment, the diffusion film under test is rubbed on the friction surface 131 of the testing instrument at least 5 times. This ensures that the simulated testing scenario is closer to the friction phenomena that may occur when electronic products undergo mechanical testing or are used, thereby improving the authenticity and accuracy of the test and making it easier to determine whether the particles of the diffusion film are easily detached under specific testing and usage environments.

[0054] Please refer to Figure 4In some embodiments of the method for testing particle shedding of optical diffusion film according to the present invention, the method further includes, before the step of rubbing the diffusion film to be tested against the friction surface 131 of the testing instrument a predetermined number of times:

[0055] Step S12: Press the diffusion film to be tested onto the friction surface 131 of the testing instrument with a preset pressure.

[0056] Understandably, the testing method of this application aims to simulate the friction scenario that exists when the diffusion film is mechanically tested or used in electronic products, in order to detect the adhesion of particles on the diffusion film and whether the particles are easily detached during friction. The frictional force experienced by the particles on the diffusion film depends on the pressure between the diffusion film and the friction surface 131 of the testing instrument and the coefficient of friction between the two. If the pressure between the diffusion film and the friction surface 131 is too small, the frictional force experienced by the diffusion film will be small, making it difficult to play a good role in friction testing. Moreover, if the frictional force is different for the same batch or the same type, the test results may also be inaccurate. In this embodiment, the diffusion film to be tested is pressed against the friction surface 131 of the testing instrument with a preset pressure to ensure that the frictional force experienced by the same batch or the same type of diffusion film is consistent, so as to more accurately determine the good and defective products in the batch of diffusion films.

[0057] Please refer to Figure 5 In some embodiments of the method for testing the shedding of optical diffusion film particles according to the present invention, in the step of pressing the diffusion film to be tested onto the friction surface 131 of the testing instrument with a preset pressure, the preset pressure is defined as g, and satisfies g≥100G.

[0058] In this embodiment, the diffusion film to be tested is pressed onto the friction surface 131 of the testing instrument with a pressure of at least 100G for friction. This avoids the diffusion film being too weak to accurately detect diffusion films with insufficient particle adhesion due to insufficient friction force. It also ensures that diffusion films of the same batch or type are tested under the same friction force, thereby improving the accuracy of the test and effectively screening out diffusion films with insufficient particle adhesion that are easy to fall off, thus ensuring the quality of backlight modules and electronic products.

[0059] In some embodiments of the method for detecting particle shedding from an optical diffusion film according to the present invention, the detection instrument is a PC board 13;

[0060] And / or, the friction surface 131 of the detector has a plurality of rhomboid protrusions arranged side by side.

[0061] Understandably, the testing method of this application aims to simulate the friction scenario that exists when the diffusion film is mechanically tested or used in electronic products, in order to detect the adhesion of particles on the diffusion film and whether the particles are easily detached during friction. In electronic products, the component that directly contacts the diffusion film is generally a PC board 13, i.e., a polycarbonate board or a polyester board. In this embodiment, the PC board 13 is used as a testing instrument to rub against the diffusion film under test, thereby more accurately simulating the usage environment when the diffusion film is applied, resulting in more accurate test results.

[0062] Understandably, the frictional force on the particles on the diffusion film depends on the pressure between the diffusion film and the friction surface 131 of the detection device, as well as their coefficient of friction. One factor affecting the coefficient of friction is the roughness of the contact surface. If the surface of the detection device is a smooth plane, the coefficient of friction between the diffusion film and the friction surface 131 will be small, resulting in a small frictional force on the diffusion film, making it difficult to achieve a good friction test effect. In some embodiments, the friction surface 131 of the detection device has multiple prismatic protrusions arranged side by side. This can increase the frictional force on the diffusion film and make the detection environment more stringent, which is more conducive to screening out diffusion films with greater particle adhesion. This makes it less likely for particles to fall off when the diffusion film is applied, thus ensuring the quality of backlight modules and electronic products.

[0063] Please refer to Figure 6 The present invention also proposes a friction testing machine 100, which can realize the method for inspecting the shedding of optical diffusion film particles as described in any of the foregoing embodiments. The friction testing machine 100 includes:

[0064] Friction platform 10, wherein the friction platform 10 is provided with friction surface 131; and

[0065] The pressure-applying member 30 has a film-coating surface 31 disposed opposite to the friction surface 131, and the pressure-applying member 30 can be translated relative to the friction surface 131 along the plane direction of the friction surface 131.

[0066] The present invention also proposes a friction testing machine 100, which can be used to complete the inspection method in any of the foregoing embodiments. That is, it eliminates the need for the user to hold the testing instrument and the diffusion film for friction, thereby reducing manual labor and improving the degree of automation. Furthermore, by conducting the test with the friction testing machine 100, various factors in the friction testing process, such as friction speed, friction force and pressure, can be kept consistent, unlike the instability that occurs in manual testing, thus improving the detection accuracy. Specifically, the friction testing machine 100 proposed in this application includes a friction platform 10 and a pressure member 30. The friction platform 10 is provided with a friction surface 131, and the pressure member 30 is provided with a film-applying surface 31 opposite to the friction surface 131. The film-applying surface 31 is used to apply a diffusion film, and the diffusion film applied on the film-applying surface 31 is in contact with the friction surface 131. In addition, the pressure member 30 can be translated relative to the friction platform 10 to drive the diffusion film to rub on the friction surface 131 to perform a friction test on the diffusion film. During this process, since the distance between the pressure member 30 and the friction surface 131 remains unchanged, the force between the diffusion film and the friction surface 131 remains unchanged during the friction test, thus improving the accuracy of the test.

[0067] Please refer to Figure 6 In some embodiments of the friction testing machine 100 of the present invention, the friction testing machine 100 further includes a translation mechanism 50, which is provided with a cantilever 51;

[0068] The pressure-applying member 30 is inserted through the cantilever 51 and is movably disposed relative to the cantilever 51 to move closer to or further away from the friction surface 131.

[0069] In this embodiment, the friction testing machine 100 further includes a translation mechanism 50, which is connected to the pressure application member 30 to drive the pressure application member 30 to slide relative to the friction surface 131, thereby causing the diffusion film on the pressure application member 30 to rub against the friction surface 131 to perform a friction test on the diffusion film. The translation mechanism 50 can be a cylinder pushing mechanism, a screw drive mechanism, a guide rail slider mechanism, a belt drive mechanism, or any combination of two or more drive mechanisms, and is not limited thereto. In this embodiment, the translation mechanism 50 is provided with a cantilever 51, which extends from the edge of the friction platform 10 to the friction surface 131. The pressure application member 30 is then inserted through the cantilever 51 so that the film-coating surface 31 of the pressure application member 30 is positioned opposite to the friction surface 131. Furthermore, the pressure application member 30 is movably mounted on the cantilever 51 so that the pressure surface is close to... Alternatively, the distance between the pressure-applying element 30 and the friction surface 131 can be adjusted. This allows the pressure to be adjusted by varying the pressure between the diffusion film and the friction surface 131, preventing inaccurate test results due to insufficient friction. Adjusting the distance allows for better control of the friction force, ensuring accurate test results. Furthermore, the sliding nature of the pressure-applying element 30 allows it to be moved away from the friction surface 131 when applying or removing the diffusion film, increasing operating space and improving the ease of installation and removal.

[0070] The pressure-applying component 30 is slidably mounted on the cantilever 51. It can have several axially arranged buckles protruding from the outer wall of the pressure-applying component 30, and snap-fit ​​holes provided on the cantilever 51. When the pressure-applying component 30 is adjusted to a suitable position, the corresponding buckles engage with the snap-fit ​​holes. The buckles can also be in the form of elastic pins. Alternatively, several snap-fit ​​holes can be provided on the cantilever 51, allowing the buckles to engage in different snap-fit ​​holes to adjust the position of the pressure-applying component 30. Alternatively, it can be fixed by a set screw or by a threaded connection as described in the following embodiments, without specific limitations.

[0071] In some embodiments of the friction testing machine 100 of the present invention, the cantilever 51 is provided with a screw hole, the outer surface of the pressure applying member 30 is provided with an external thread, and the pressure applying member 30 is movably inserted into the cantilever 51 through the mating shell of the external thread and the screw hole.

[0072] In this embodiment, the cantilever 51 has a screw hole facing the friction surface 131, and at least part of the pressure-applying member 30 is configured as a screw. In this case, the pressure-applying member 30 is threadedly connected to the screw hole. By simply rotating the pressure-applying member 30, the pressure-applying member 30 can be raised and lowered in the screw hole, thereby causing the film-applying surface 31 and the diffusion film to move closer to or away from the friction surface 131. The threaded connection also has a self-locking function, which can keep the relative position of the pressure-applying member 30 and the cantilever 51 stable.

[0073] Furthermore, in some embodiments of the friction testing machine 100 of the present invention, the cantilever 51 has a through hole through which the pressure-applying member 30 passes, and a stop portion 33 protrudes from one end of the pressure-applying member 30 away from the friction surface 131, and the cross-section of the stop portion 33 is larger than the through hole.

[0074] In this embodiment, the pressure-applying member 30 has two ends facing away from each other. One end face forms a film-applying surface 31 for fixing the diffusion film, and the other end is provided with a stop portion 33. The cross-section of the stop portion 33 is larger than the cross-section of the through hole on the cantilever 51, which can prevent the pressure-applying member 30 from falling directly from the cantilever 51. It is also used to limit the minimum distance between the film-applying surface 31 and the friction surface 131, so as to prevent the film-applying surface 31 and the friction surface 131 from colliding with each other, which would damage the pressure-applying member 30 or affect the roughness of the friction surface 131.

[0075] Please refer to Figure 6 In some embodiments of the friction testing machine 100 of the present invention, the friction platform 10 includes:

[0076] Platform body 11; and

[0077] PC board 13 is fixed to the surface of the platform body 11, and the surface of the PC board 13 facing away from the platform body 11 forms the friction surface 131.

[0078] In this embodiment, the friction platform 10 includes a platform body 11 as the mounting base and a PC board 13 as the testing instrument. The translation mechanism 50 and the pressure application component 30 can both be mounted on the platform body 11 to improve the integrity of the overall structure and facilitate the overall handling and installation of the friction testing machine 100. It is understood that the testing method of this application aims to simulate the friction scenario present when the diffusion film is mechanically tested or used in electronic products, in order to detect the particle adhesion on the diffusion film and whether the particles are easily detached during friction. In electronic products, the component in direct contact with the diffusion film is generally the PC board 13, i.e., a polycarbonate board or polyester board. In this embodiment, the PC board 13 is used as a testing instrument for friction with the diffusion film under test, thereby more accurately simulating the usage environment when the diffusion film is applied, resulting in more accurate test results.

[0079] The PC board 13 can be fixed to the platform body 11 by means of adhesive bonding or by embedding it in grooves on the surface of the platform body 11, or by means of pressing with tape, pressure block or other pressing parts 15 as shown in the embodiment. Multiple pressing parts 15 can be provided to press onto the four corners or different sides of the PC board 13 respectively. The pressing parts 15 can also be provided as a ring structure to press onto the circumference of the PC board 13. No limitation is made here.

[0080] In some embodiments of the friction testing machine 100 of the present invention, the friction surface 131 has a plurality of rhomboid protrusions arranged side by side.

[0081] Understandably, the frictional force on the particles on the diffusion film depends on the pressure between the diffusion film and the friction surface 131 of the detection device, as well as their coefficient of friction. One factor affecting the coefficient of friction is the roughness of the contact surface. If the surface of the detection device is a smooth plane, the coefficient of friction between the diffusion film and the friction surface 131 will be small, resulting in a small frictional force on the diffusion film, making it difficult to achieve a good friction test effect. In this embodiment, the friction surface 131 of the detection device has multiple prismatic protrusions arranged side by side. This increases the frictional force on the diffusion film and makes the detection environment more stringent, which is more conducive to screening out diffusion films with greater particle adhesion. This makes it less likely for particles to fall off when the diffusion film is applied, thus ensuring the quality of the backlight module and electronic products.

[0082] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for detecting particle shedding from an optical diffusion film, characterized in that, The method for inspecting particle shedding from the optical diffusion film includes the following steps: A fixed testing device, wherein the friction surface of the testing device has multiple rhomboid protrusions arranged side by side, and the testing device is a PC board; The diffusion membrane to be tested is pressed onto the friction surface of the testing instrument under a preset pressure, wherein the preset pressure is g and satisfies g≥100G; The diffusion film to be tested is rubbed on the friction surface of the testing instrument a preset number of times, wherein the preset number of times is n, and n≥5 times; Observe whether there are particle shedding defects on the surface of the diffusion film to be inspected.

2. A friction testing machine, capable of implementing the method for inspecting particle shedding of optical diffusion film as described in claim 1, characterized in that, The friction testing machine includes: A friction platform, comprising a platform body and a PC board, wherein the PC board is fixed to the surface of the platform body, and the surface of the PC board facing away from the platform body forms a friction surface, the friction surface having a plurality of rhomboid protrusions arranged side by side; The pressure-applying component has a film-coated surface disposed opposite to the friction surface, and the pressure-applying component can be translated relative to the friction surface along the plane direction of the friction surface; A translation mechanism is provided, wherein the translation mechanism is provided with a cantilever, and the pressure applying member is passed through the cantilever. The pressure applying member is movably disposed relative to the cantilever to move closer to or further away from the friction surface. The cantilever is provided with a threaded hole, and the outer surface of the pressure applying member is provided with an external thread. The pressure applying member is movably passed through the cantilever through the cooperation of the external thread and the threaded hole.

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