Membrane material laminating roller and membrane material laminating device

Abstract

The embodiment of the invention discloses a membrane material laminating roller and a membrane material laminating device, and belongs to the technical field of electronic equipment manufacturing. The membrane material laminating roller comprises a roller shaft and an elastic sleeve, the roller shaft is sleeved with the elastic sleeve, the elastic sleeve comprises a plurality of rolling parts which are coaxially arranged, the rolling parts comprise at least one first rolling part and at least one second rolling part, and the elastic sleeve is configured in the mode that if the first rolling parts and the second rolling parts deform to be the same in thickness in the radial direction, the first rolling parts and the second rolling parts are separated from each other. And the elastic force generated by the first rolling part is greater than that generated by the second rolling part. In the laminating process, the first rolling part can apply larger pressure to the membrane material than the second rolling part, so that the part, rolled by the first rolling part, of the membrane material is laminated more firmly than the part, rolled by the second rolling part, of the membrane material. According to the film material laminating roller, different pressures can be applied to different areas of a film material in the laminating process, so that the laminating tightness degrees of the different areas of the film material are different, and different laminating effects are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment manufacturing, and in particular to a film material laminating roller and a film material laminating device including the film material laminating roller. Background Art

[0002] The display panel is an important structure of various electronic devices with display functions. A film material with certain functions, such as a protective film with a protective function, is usually attached to the display side of the display panel.

[0003] When laminating the film material, one side of the film material is generally placed on the surface of the display panel, and then a film laminating roller is used to roll the film material from one side to the other side to gradually laminate the film material to the surface of the display panel.

[0004] During the lamination process, if the pressure of the laminating roller on the film material is too high or too low, it may have an adverse effect, which is more obvious in foldable electronic devices. For example, if the pressure applied when laminating the film material is too low, when the electronic device is folded, there is a risk that the film material will separate from the display panel at the edge, especially at the bend; if the pressure applied when laminating the film material is too high, it may affect the function or display effect of the display panel. Summary of the invention

[0005] The embodiments of the present application provide a film laminating roller and a film laminating device, which can overcome the problems in the related art. The technical solution is as follows:

[0006] In the first aspect, an embodiment of the present application provides a film laminating roller, which includes a roller shaft and an elastic sleeve, wherein the elastic sleeve is arranged outside the roller shaft, and the elastic sleeve includes a plurality of coaxially arranged rolling parts, wherein the plurality of rolling parts include at least one first rolling part and at least one second rolling part, and the elastic sleeve is configured such that if the first rolling part and the second rolling part are deformed radially to the same thickness, the elastic force generated by the first rolling part is greater than the elastic force generated by the second rolling part.

[0007] Based on the above-mentioned film material bonding roller, an elastic sleeve is arranged outside the roller shaft. When bonding the film material, the film material bonding roller is pressed on the surface of the film material, the elastic sleeve contacts the film material, and the elastic sleeve is deformed to apply pressure to the film material. Since the elastic sleeve includes a plurality of coaxial rolling parts, wherein the first rolling part and the second rolling part generate different elastic forces when they are deformed radially to the same thickness, and the elastic force generated by the first rolling part is greater, the first rolling part can apply greater pressure to the film material during the bonding process, and the part of the film material rolled by the first rolling part is more firmly bonded than the part rolled by the second rolling part. In other words, the film material bonding roller can apply different amounts of pressure to different areas of the film material during the bonding process, so that different areas of the film material are bonded to different degrees of tightness, so as to achieve different bonding effects.

[0008] In some examples, the elastic modulus of the first rolling part is greater than the elastic modulus of the second rolling part. When the film material is pressed against the surface of the film material by the laminating roller, the first rolling part and the second rolling part are both in a compressed state, and the thickness after compression is basically the same. The size of the elastic modulus affects the size of the elastic force when elastic deformation occurs. When designing the elastic sleeve, the elastic modulus of the first rolling part and the second rolling part are configured so that the first rolling part can provide greater pressure than the second rolling part.

[0009] In some examples, the first rolling part includes a first sleeve, the second rolling part includes a second sleeve, the first sleeve and the second sleeve are respectively sleeved outside the roller shaft, and the elastic modulus of the first sleeve is greater than the elastic modulus of the second sleeve. By providing two sleeves with different elastic moduli, different pressures can be generated by the first sleeve and the second sleeve during the film lamination process, and the structure is simple and easy to design.

[0010] In some examples, the first rolling part also includes a third sleeve, the third sleeve is sleeved outside the roller shaft, the first sleeve is sleeved outside the third sleeve, and the elastic modulus of the third sleeve is the same as the elastic modulus of the second sleeve. The first rolling part includes a first sleeve and a third sleeve that are sleeved together, and the third sleeve is equivalent to a skeleton that supports the first sleeve. The first sleeve with a larger elastic modulus than the second sleeve is sleeved outside the third sleeve, so that the elastic modulus of the first rolling part can be greater than the elastic modulus of the second rolling part. By replacing the first sleeve with different elastic moduli, the elastic modulus of the first rolling part can be adjusted more flexibly, so that the elastic modulus of the first rolling part and the elastic modulus of the second rolling part better match the design requirements.

[0011] In some examples, the third housing and the second housing are an integral structure. The third housing and the second housing are integrally formed and have the same material and structure, so that the elastic modulus of the third housing is the same as the elastic modulus of the second housing. The integral structure is convenient for manufacturing.

[0012] In other examples, the second rolling part also includes a fourth sleeve, the fourth sleeve is sleeved outside the roller shaft, the second sleeve is sleeved outside the fourth sleeve, and the elastic modulus of the fourth sleeve is the same as the elastic modulus of the first sleeve. The second rolling part includes a second sleeve and a fourth sleeve that are sleeved together, the fourth sleeve is equivalent to a skeleton, supporting the second sleeve, and the second sleeve with a smaller elastic modulus than the first sleeve is sleeved outside the fourth sleeve, so that the elastic modulus of the second rolling part can be smaller than the elastic modulus of the first rolling part. By replacing the second sleeve with different elastic moduli, the elastic modulus of the second rolling part can be adjusted more flexibly, so that the elastic modulus of the first rolling part and the elastic modulus of the second rolling part better match the design requirements.

[0013] As an example, the fourth housing and the first housing are an integral structure.

[0014] In some examples, the natural thickness of the first rolling portion is greater than the natural thickness of the second rolling portion. When the film material laminating roller is pressed on the surface of the film material, one side of the elastic sleeve contacts the film material. The greater the pressure of the film material laminating roller on the surface of the film material, the greater the deformation degree of the side of the elastic sleeve in contact with the film material. However, since the roller shaft and the surface of the film material are parallel or approximately parallel during the laminating process, multiple rolling portions will deform to the same thickness in the axial direction of the elastic sleeve. Since the natural thickness of the first rolling portion is greater than the natural thickness of the second rolling portion, the deformation amount of the first rolling portion is greater when deformed to the same thickness. Even if the elastic modulus of the first rolling portion is the same as that of the second rolling portion, or even if the elastic modulus of the first rolling portion is smaller, the first rolling portion can generate a greater elastic force. This allows a wider range of material choices when making the elastic sleeve, and is not limited to using a material with a larger elastic modulus to make the first rolling portion. Of course, the elastic modulus of the first rolling part can also be greater than the elastic modulus of the second rolling part. Combining the two factors of elastic modulus and natural thickness, the force applied by the first rolling part and the second rolling part to the film material during the bonding process can match the design requirements.

[0015] As an example, the elastic modulus of the first rolling part is the same as that of the second rolling part, and the natural thickness of the first rolling part is greater than that of the second rolling part. Since the elastic modulus of the first rolling part and the second rolling part are the same, the difference in pressure of the two rolling parts on the film during the bonding process can be accurately designed only by the difference in their natural thicknesses.

[0016] In some examples, the plurality of rolling parts include at least two first rolling parts, and the rolling parts of the plurality of rolling parts except the two first rolling parts are all located between the two first rolling parts. At the edge of the display panel, especially in a foldable electronic device, at the edge where the display panel is folded, the film material is more likely to separate from the display panel. By setting the two rolling parts arranged at both ends of the plurality of rolling parts as the first rolling parts, the first rolling parts are used to provide a greater pressure, so that the film material fits more closely to the edge of the display panel, thereby preventing the film material from separating from the display panel.

[0017] In some examples, the multiple rolling parts include at least two second rolling parts, and at least one first rolling part among the multiple rolling parts is located between the two second rolling parts and is arranged adjacent to the two second rolling parts. For example, in some foldable electronic devices, in the middle of the back of the display panel, close to the folding area, there are some hard structures that can provide support for the display panel. In these supported areas, the first rolling part located between the two second rolling parts applies force so that the film material and the display panel can fit more firmly, while on both sides of the hard structure, the display panel lacks support, and the second rolling part is used to apply force to avoid damage to the display panel due to excessive force.

[0018] In some examples, the plurality of rolling parts include at least two second rolling parts, the plurality of rolling parts also include at least one third rolling part, at least one third rolling part among the plurality of rolling parts is located between the two second rolling parts, and is arranged adjacent to the two second rolling parts, and the elastic sleeve is configured so that if the second rolling part and the third rolling part are deformed to the same thickness in the radial direction, the elastic force generated by the second rolling part is greater than the elastic force generated by the third rolling part. Compared with the second rolling part, the pressure force applied to the film material by the third rolling part is smaller during the film material bonding process. For example, in some foldable electronic devices, there may be some sharp structures on the back of the display panel near the folding area. If the pressure applied to the display panel during the film material bonding process is relatively large, the display panel may be scratched or punctured by the sharp structure, resulting in damage to the display panel. A relatively small force is applied to these parts by the third rolling part to prevent the display panel from being damaged by these sharp structures.

[0019] In a second aspect, an embodiment of the present application further provides a film material laminating device, which includes a frame and any one of the film material laminating rollers described in the first aspect, wherein both ends of the roller shaft of the film material laminating roller are rotatably connected to the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a film material bonding process in the related art;

[0021] Figure 2 It is a structural schematic diagram of a foldable electronic device in the related art;

[0022] Figure 3 is a schematic top view of a display panel in the related art;

[0023] Figure 4 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0024] Figure 5 is a deformation schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0025] Figure 6 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0026] Figure 7 It is simulated Figure 6 The schematic diagram of the distribution of the pressure applied by the film laminating roller to the film when laminating the film is shown;

[0027] Figure 8 It is a partial structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0028] Fig. 9 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0029] Fig.10 is a schematic axial cross-sectional view of a film laminating roller provided in an embodiment of the present application;

[0030] Fig.11 is a schematic axial cross-sectional view of a film laminating roller provided in an embodiment of the present application;

[0031] Fig.12 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0032] Fig.13 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0033] Fig.14 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0034] Fig.15 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0035] Fig.16 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application;

[0036] Fig.17It is a structural schematic diagram of a film material bonding device provided in an embodiment of the present application.

[0037] Legend

[0038] 10. Roller 100, display panel 101, protective film 102, folding hinge

[0039] 103, support body 160, frame 161, placement table 162, movable bracket 163, bearing

[0040] 1001, shaft area 1002, non-shaft area 1021, swing arm 1001a, edge of shaft area

[0041] 1002a, camera hole 1024, first component 1025, second component 20, elastic sleeve

[0042] 21, first rolling part 22, second rolling part 23, third rolling part

[0043] 200, film material laminating roller 201, adhesive layer 211, first cover 221, second cover

[0044] 212, third set 222, fourth set 232, fifth set 231, sixth set DETAILED DESCRIPTION

[0045] The terms used in the implementation mode of the present application are only used to explain the embodiments of the present application, and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the implementation mode of the present application should be the common meanings understood by people with ordinary skills in the field to which the present application belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" and similar words mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] The surface of the display panel is usually laminated with a film material, such as a protective film. The protective film is laminated to the surface of the display panel to provide certain protection for the display panel, such as preventing the surface of the display panel from being scratched. Taking the protective film as an example, Figure 1 This is a schematic diagram of a film material bonding process in the related technology. Figure 1 As shown, during the lamination process, after one side of the protective film 101 is laminated to the surface of the display panel 100, the protective film 101 is gradually laminated to the surface of the display panel 100 by rolling the film laminating roller 200 on the surface of the protective film 101. During the rolling process of the film laminating roller 200, the film laminating roller 200 applies a pressure perpendicular or approximately perpendicular to the surface of the display panel 100 to the protective film 101. The magnitude of the pressure affects the tightness of the lamination of the protective film 101. The greater the pressure applied, the tighter the protective film 101 is laminated.

[0047] Figure 2 It is a structural schematic diagram of a foldable electronic device in the related art. Figure 2 The foldable electronic device is shown in the unfolded state. Figure 2 As shown, the foldable electronic device generally includes a display panel, a folding hinge 102 and two supporting bodies 103. In order to show the folding hinge 102, Figure 2 At least the display panel 100 is removed. Figure 2 Only part of the structure of the folding hinge 102 is schematically shown, and the actual positional relationship and connection relationship between the structures are not limited. The folding hinge 102 is connected between the two supporting bodies 103. The swing arm 1021 of the folding hinge 102 is connected to the supporting body 103, so that the two supporting bodies 103 can be relatively opened and closed. The folding hinge 102 also includes a cam 1022 and a torsion spring 1023. The cam 1022 and the torsion spring 1023 cooperate with each other to provide a certain damping for the opening and closing of the supporting body 103, or to keep the two supporting bodies 103 at certain specific angles. The display panel is arranged on the folding hinge 102 and the two supporting bodies 103. Figure 3 This is a top view of a display panel in the related art. In order to better illustrate the film material bonding process, Figure 3 The film material laminating roller 200 is also schematically shown in FIG. The display panel may be a flexible display panel in a foldable electronic device. Figure 3As shown, the display panel includes an axis area 1001 and a non-axis area 1002, wherein the non-axis area 1002 is connected to the supporting body 103, and the axis area 1001 is located at the folding hinge 102. During the folding process of the electronic device, the axis area 1001 of the display panel 100 is bent. During the bending process, due to the influence of stress, the edges of the display panel 100, especially the edge 1001a of the axis area 1001, the protective film 101 and the display panel 100 are at risk of separation from each other. With the increase in the number of bending times and the length of use time, the risk of separation of the protective film 101 and the display panel 100 will gradually increase. As an example, Figure 3 The display panel shown has a camera hole 1002a in the non-axis area 1002. A display panel without the camera hole 1002a also has the risks mentioned here.

[0048] In order to reduce the risk of the protective film 101 and the display panel 100 being separated from each other, the pressure of the film laminating roller on the protective film 101 can be increased during the laminating process of the protective film 101, so that the protective film 101 and the display panel 100 are more closely attached. However, the folding hinge structure is complex, the surface is not flat, and some parts can move relative to each other, such as Figure 1 As shown, the first component 1024 in the folding hinge can remain stable and stably support the display panel 100 during the process of laminating the film material, while the second component 1025 will move relative to the first component 1024 when subjected to external force, and cannot stably support the display panel 100. When the film material laminating roller 200 rolls to the position corresponding to the second component 1025, if the pressure is large, the display panel 100 will be concave. There are many structural forms of folding hinges. In different folding hinges, the structures corresponding to the first component 1024 and the second component 1025 may also be different. It can be seen that in the process of laminating the protective film 101, the film material laminating roller 200 exerts too much pressure on the protective film 101, which can easily cause the shaft area 1001 of the display panel 100 to become uneven, affecting the display effect. In severe cases, it may even cause damage to the display panel 100, affecting its function.

[0049] It can be seen that in the process of laminating the film, the requirements for the pressure of the film laminating roller in different areas are not necessarily the same. For example, at the edge of the display panel 100, especially at the edge 1001a of the axis area 1001, the film laminating roller needs to exert a greater pressure on the film, while in the axis area 1001, the film laminating roller 200 needs to exert a smaller pressure on the film.

[0050] The above description of the requirements for pressure in different areas during the film lamination process is only an example. There are usually structural differences between different electronic devices, and these structural differences may lead to different requirements for pressure in different areas during the film lamination process. In the related art, the film lamination roller 200 includes a roller shaft and a layer of soft material wrapped outside the roller shaft. The elastic modulus and thickness of the soft material are the same at all places. This structure makes the pressure of the film lamination roller on the film material at all places equal during the film lamination process, and it is impossible to adjust the pressure applied locally to the film material, and it is not possible to well match the requirements for pressure in different areas.

[0051] Figure 4 Schematic diagram of the structure of a film laminating roller provided in an embodiment of the present application. Figure 4 As shown, the film laminating roller comprises a roller shaft 10 and an elastic sleeve 20, wherein the elastic sleeve 20 is sleeved outside the roller shaft 10, and the elastic sleeve 20 comprises a plurality of coaxially arranged rolling parts, wherein the plurality of rolling parts comprises at least one first rolling part 21 and at least one second rolling part 22. The elastic sleeve 20 is configured such that if the first rolling part 21 and the second rolling part 22 are deformed to the same thickness in the radial direction, the elastic force generated by the first rolling part 21 is greater than the elastic force generated by the second rolling part 22.

[0052] The rolling part is cylindrical in a natural state, where the natural state refers to a state in which the elastic sleeve 20 is not squeezed and deformed. The thickness of the rolling part is the distance between the inner peripheral wall and the outer peripheral wall of the rolling part at the closest point. Figure 5 Schematic diagram of deformation of a film laminating roller provided in an embodiment of the present application. Figure 5 As shown by the dotted line in the figure, before the film bonding roller applies pressure to the film material, the elastic sleeve 20 is in a natural state, the inner circumferential wall and the outer circumferential wall of the rolling portion are both cylindrical, the thickness of the rolling portion is the difference between the radius of the outer circumferential wall and the radius of the inner circumferential wall, the elastic sleeve 20 is sleeved outside the roller shaft 10, and the radius of the inner circumferential wall is also the radius of the roller shaft 10; when the film bonding roller is pressed on the surface of the film material, the portion of the elastic sleeve 20 located between the roller shaft 10 and the film material is squeezed, and at the squeezing point, the rolling portion is deformed along the radial direction of the elastic sleeve 20, and the distance H between the inner circumferential wall and the outer circumferential wall is smaller than the difference between the radius of the outer circumferential wall and the radius of the inner circumferential wall in the natural state, and the thickness of the rolling portion becomes smaller.

[0053] By arranging an elastic sleeve 20 outside the roller shaft 10, when laminating the film material, the film laminating roller is pressed on the surface of the film material, the elastic sleeve 20 contacts the film material, and the elastic sleeve 20 is deformed to apply pressure to the film material. Since the elastic sleeve 20 includes a plurality of coaxial rolling parts, wherein the first rolling part 21 and the second rolling part 22 generate different elastic forces when they are deformed to the same thickness in the radial direction, and the elastic force generated by the first rolling part 21 is greater, the first rolling part 21 can apply greater pressure to the film material during the laminating process, and the part of the film material rolled by the first rolling part 21 is more firmly laminated than the part rolled by the second rolling part 22. In other words, the film laminating roller can apply different pressures to different areas of the film material during the laminating process, and can better match the requirements of different areas for pressure, so that different areas of the film material are laminated to different degrees of tightness, so as to achieve different laminating effects.

[0054] In some examples, the plurality of rolling parts include at least two first rolling parts 21 , and the rolling parts other than the two first rolling parts 21 in the plurality of rolling parts are all located between the two first rolling parts 21 .

[0055] As an example, Figure 6 Schematic diagram of the structure of a film laminating roller provided in an embodiment of the present application. Figure 6 As shown, in the film material laminating roller, the elastic sleeve 20 includes two first rolling parts 21 and a second rolling part 22, and the second rolling part 22 is located between the two first rolling parts 21. By arranging the two first rolling parts 21 at the end positions of the elastic sleeve 20, when laminating the film material, the two first rolling parts 21 roll the film material at the edge of the display panel 100, and the pressure applied by the first rolling parts 21 is relatively large, so that the film material at the edge of the display panel 100 is more closely attached, reducing the risk of separation between the film material and the display panel 100, especially the risk of separation at the edge of the axis area 1001; the second rolling part 22 rolls the film material at the middle of the display panel 100, and the pressure applied by the second rolling part 22 is relatively small, which can prevent the axis area 1001 of the display panel 100 from becoming uneven.

[0056] Figure 7 It is simulated Figure 6 The schematic diagram of the pressure distribution of the film material laminating roller when laminating the film material is shown. In order to further illustrate the difference between the pressure distribution of the film material laminating roller provided in the embodiment of the present application when laminating the film material and the film material laminating roller in the related art, Figure 7 The figure also shows the distribution of the pressure applied to the film material by the film laminating rollers of the same length and diameter in the related art as a comparison. Figure 7As shown, for the film laminating roller of the embodiment of the present application, when the pressure applied by the first rolling part 21 reaches F1, the pressure applied by the second rolling part 22 is F2, and F2 < F1; for the film laminating roller in the related art, when the pressure applied near the two ends of the film laminating roller reaches F1, the pressure applied in the middle of the film laminating roller is also F1. In other words, using Figure 6 When the film laminating rollers shown are laminating the film, the first rolling part 21 and the second rolling part 22 can apply different pressures to the film.

[0057] The elastic force that the rolling part can generate is affected by the elastic modulus and deformation amount of the rolling part. The elastic sleeve 20 can be configured based on at least one of the elastic modulus and deformation amount so that, if the first rolling part 21 and the second rolling part 22 are deformed radially to the same thickness, the elastic force generated by the first rolling part 21 is greater than the elastic force generated by the second rolling part 22, thereby achieving the purpose of the film bonding roller being able to apply different amounts of pressure to different parts of the film during the film bonding process.

[0058] In some examples, the elastic modulus of the first rolled portion 21 is greater than the elastic modulus of the second rolled portion 22 .

[0059] For two rolling parts with different elastic moduli, when the deformation amount is the same, the rolling part with a larger elastic modulus generates a larger elastic force, thereby being able to apply a larger pressure to the film material during the film bonding process. Since the material used to make the rolling part affects the elastic modulus of the rolling part, the elastic modulus of the first rolling part 21 can be made larger by selecting a suitable material to make the rolling part.

[0060] like Figure 6 As shown, the first rolling part 21 includes a first sleeve 211, and the second rolling part 22 includes a second sleeve 221. The first sleeve 211 and the second sleeve 221 are respectively sleeved outside the roller shaft 10. The elastic modulus of the first sleeve 211 is greater than that of the second sleeve 221.

[0061] exist Figure 6 In the example shown, each rolling part is a sleeve, and the entire elastic sleeve 20 includes a plurality of sleeves coaxially connected in sequence. The elastic modulus of the first sleeve 211 is the elastic modulus of the first rolling part 21, and the elastic modulus of the second sleeve 221 is the elastic modulus of the second rolling part 22. When manufacturing the film laminating roller, the first sleeve 211 and the second sleeve 221 can be manufactured by selecting materials according to the elastic modulus to be achieved by the first rolling part 21 and the second rolling part 22. This elastic sleeve 20 has a simple structure and is easy to manufacture.

[0062] Figure 8 Schematic diagram of the partial structure of a film laminating roller provided in an embodiment of the present application. Figure 8As shown, the adjacent rolling parts can be bonded by an adhesive layer 201. The adhesive layer 201 can be a double-sided adhesive. For another example, adhesives such as glue can also be used for bonding. When making a film material bonding roller, the arrangement order of the multiple rolling parts can be adjusted according to the electronic equipment to be adapted, and then bonding is performed.

[0063] The elastic sleeve 20 and the roller 10 may be interference fit to avoid relative movement between the elastic sleeve 20 and the roller 10 during the film lamination process. The elastic sleeve 20 and the roller 10 may also be bonded to each other to make the connection between the elastic sleeve 20 and the roller 10 more secure and avoid relative movement between the elastic sleeve 20 and the roller 10.

[0064] In some examples, the roller 10 may be a metal roller, that is, made of metal material. The metal roller has a relatively large rigidity compared to the elastic sleeve 20. During the process of laminating the film material, the deformation of the roller 10 is very small, which will not affect the lamination of the film material. In other examples, the roller 10 may also be made of non-metallic materials, such as plastic.

[0065] Fig. 9 Schematic diagram of the structure of a film laminating roller provided in an embodiment of the present application. Figure 6 The film laminating roller shown, such as Fig. 9 As shown, the first rolling part 21 of the film laminating roller includes a first sleeve 211 and a third sleeve 212, the third sleeve 212 is sleeved outside the roller shaft 10, and the first sleeve 211 is sleeved outside the third sleeve 212. The elastic modulus of the third sleeve 212 is the same as that of the second sleeve 221.

[0066] Exemplarily, the first sleeve 211 may be interference fit with the third sleeve 212 .

[0067] Fig. 9 In the film laminating roller shown, the elastic modulus of the first rolling portion 21 is affected by the first sleeve 211 and the third sleeve 212. Since the elastic modulus of the third sleeve 212 is the same as the elastic modulus of the second sleeve 221, the elastic modulus of the first rolling portion 21 can be adjusted by adjusting the first sleeve 211. For example, when manufacturing the elastic sleeve 20, at least one of the material and thickness of the first sleeve 211 can be adjusted so that the elastic modulus of the first rolling portion 21 meets the design requirements.

[0068] Fig.10 is a schematic diagram of an axial cross-section of a film laminating roller provided in an embodiment of the present application. As an example, Fig.10 As shown, the third sleeve 212 and the second sleeve 221 are an integral structure.

[0069] Since the elastic modulus of the third housing 212 is the same as that of the second housing 221, the third housing 212 and the second housing 221 can be made of the same material. The third housing 212 and the second housing 221 are arranged as an integral structure and are made by an integral molding process, which is more convenient to manufacture.

[0070] In this example, the outer diameter of the third sleeve 212 is smaller than the outer diameter of the second sleeve 221, and the outer diameter of the first sleeve 211 is the same as the outer diameter of the second sleeve 221. In other words, the outer peripheral wall of the first sleeve 211 is flush with the outer peripheral wall of the second sleeve 221, so that during the process of laminating the film material, the roller shaft 10 is kept parallel to the surface of the film material, and the deformation magnitude of the first rolling part 21 and the second rolling part 22 along the radial direction is the same.

[0071] Fig.11 Schematic diagram of the axial cross section of a film laminating roller provided in an embodiment of the present application. Figure 6 The film laminating roller shown, such as Fig.11 As shown, the second rolling part 22 of the film laminating roller includes a second sleeve 221 and a fourth sleeve 222, wherein the fourth sleeve 222 is sleeved outside the roller shaft 10, and the second sleeve 221 is sleeved outside the fourth sleeve 222. The elastic modulus of the fourth sleeve 222 is the same as that of the first sleeve 211.

[0072] Fig.11 In the film laminating roller shown, the elastic modulus of the second rolling portion 22 is jointly affected by the second sleeve 221 and the fourth sleeve 222. Since the elastic modulus of the fourth sleeve 222 is the same as the elastic modulus of the first sleeve 211, the elastic modulus of the second rolling portion 22 can be adjusted by adjusting the second sleeve 221. For example, when manufacturing the elastic sleeve 20, at least one of the material and thickness of the second sleeve 221 can be adjusted so that the elastic modulus of the second rolling portion 22 meets the design requirements.

[0073] As an example, the fourth housing 222 and the first housing 211 are an integral structure.

[0074] Since the elastic modulus of the fourth sleeve 222 is the same as that of the first sleeve 211, the fourth sleeve 222 and the first sleeve 211 can be made of the same material. The fourth sleeve 222 and the first sleeve 211 are set as an integral structure and made by an integral molding process, which is more convenient to manufacture.

[0075] In this example, the outer diameter of the fourth sleeve 222 is smaller than the outer diameter of the first sleeve 211, and the outer diameter of the second sleeve 221 is the same as the outer diameter of the first sleeve 211. In other words, the outer peripheral wall of the second sleeve 221 is flush with the outer peripheral wall of the first sleeve 211, so that during the process of laminating the film material, the roller shaft 10 is kept parallel to the surface of the film material, and the deformation magnitude of the first rolling part 21 and the second rolling part 22 along the radial direction is the same.

[0076] like Figures 4 to 11 In the example shown, the natural thickness of the first rolled portion 21 is equal to the natural thickness of the second rolled portion 22. The natural thickness of the rolled portion refers to the thickness of the rolled portion in a natural state. In a natural state, the rolled portion is cylindrical, and its thickness is the difference between the radius of the outer peripheral wall and the radius of the inner peripheral wall.

[0077] In some examples, the natural thickness of the first rolled portion 21 and the natural thickness of the second rolled portion 22 may not be equal.

[0078] Fig.12 Schematic diagram of the structure of a film laminating roller provided in an embodiment of the present application. Fig.12 As shown, in the film laminating roller, the natural thickness of the first rolling part 21 is greater than the natural thickness of the second rolling part 22 .

[0079] Since the natural thickness of the first rolling part 21 is greater than that of the second rolling part 22 , during the film bonding process, the radial deformation of the first rolling part 21 is greater than that of the second rolling part 22 , thereby applying greater pressure to the film.

[0080] As an example, the elastic modulus of the first rolling part 21 is the same as the elastic modulus of the second rolling part 22. According to Hooke's law, within the elastic limit, the stress of an elastic object is proportional to the strain. For two objects with the same elastic modulus, the larger the deformation of the object, the greater the elastic force generated. Since the elastic modulus of the first rolling part 21 and the second rolling part 22 are the same, the difference in pressure of the first rolling part 21 and the second rolling part 22 on the film material during the bonding process can be designed only by the difference in their natural thickness. The greater the difference in the natural thickness of the first rolling part 21 and the second rolling part 22, the greater the difference in pressure of the first rolling part 21 and the second rolling part 22 on the film material during the bonding process.

[0081] In addition, since the elastic modulus of the first rolling portion 21 is the same as that of the second rolling portion 22 , the first rolling portion 21 and the second rolling portion 22 can also be an integral structure, that is, made using an integral molding process, which is beneficial to reducing the difficulty of making the elastic sleeve 20 .

[0082] In other examples, the elastic modulus of the first rolling part 21 is greater than that of the second rolling part 22, and the natural thickness of the first rolling part 21 is also greater than that of the second rolling part 22. Compared with the second rolling part 22, the first rolling part 21 has a larger elastic modulus and a larger natural thickness, so that the first rolling part 21 can apply a greater pressure to the film during the film laminating roller laminating the film.

[0083] Since the difference in elastic modulus and the difference in natural thickness can both affect the pressure difference that different rolling parts can apply to the film material, therefore, by matching the difference in elastic modulus and the difference in natural thickness, when the elastic modulus of the first rolling part 21 is greater than the elastic modulus of the second rolling part 22, while the natural thickness of the first rolling part 21 is less than the natural thickness of the second rolling part 22, or when the elastic modulus of the first rolling part 21 is less than the elastic modulus of the second rolling part 22, while the natural thickness of the first rolling part 21 is greater than the natural thickness of the second rolling part 22, the first rolling part 21 can apply greater pressure to the film material during the process of laminating the film material.

[0084] As an example, Figure 6 to Figure 12 The film material laminating roller shown, the elastic sleeve 20 includes two first rolling parts 21 and one second rolling part 22, and the second rolling part 22 is located between the two first rolling parts 21. The number of rolling parts and the relative positions of different rolling parts can be set according to the structure of the specific electronic device, so that in the process of laminating the film material, the pressure applied to the film material by each rolling part can match the pressure requirements of different areas.

[0085] In some examples, the plurality of rolling parts include at least two second rolling parts 22 , at least one first rolling part 21 among the plurality of rolling parts is located between the two second rolling parts 22 , and the first rolling part 21 is arranged adjacent to the two second rolling parts 22 .

[0086] Fig.13 It is a structural schematic diagram of a film laminating roller provided in an embodiment of the present application. Fig.13 The distribution of multiple rolling parts is only schematically shown in FIG. 1 . For the structure of each rolling part, the natural thickness of different rolling parts, and the relationship between adjacent rolling parts, please refer to FIG. Figures 4 to 12 Any film laminating roller shown. The relationship between adjacent rolling parts includes but is not limited to, the adjacent rolling parts are an integral structure, or parts of the adjacent rolling parts are an integral structure, or the adjacent rolling parts are bonded. Fig.13As shown, in this example, the elastic sleeve 20 includes three first rolling parts 21 and two second rolling parts 22, and the three first rolling parts 21 and the two second rolling parts 22 are alternately distributed along the axial direction of the roller shaft 10, and one of the three first rolling parts 21 is distributed in the middle of the elastic sleeve 20. In a foldable electronic device, some structures in the folding hinge 102 have relatively flat surfaces that can support the display panel, such as the cam 1022 in the folding hinge 102, the swing arm 1021 used to connect the support body 103, etc. Taking the swing arm 1021 as an example, when the electronic device is in a flat state, since the swing arm 1021 provides support for the back of the display panel, when the film material is attached, the first rolling part 21 distributed in the middle of the elastic sleeve 20 can apply a large pressure on the front of the display panel opposite to the swing arm 1021, so that the film material and the display panel are closely attached. In the shaft area 1001 , other positions on both sides of the swing arm 1021 lack a relatively flat support structure, and the second rolling part 22 is used to fit the film material to avoid the shaft area 1001 becoming uneven due to excessive pressure.

[0087] Fig.14 Schematic diagram of the structure of a film laminating roller provided in an embodiment of the present application. Fig.14 As shown, in this example, the plurality of rolling parts include not only the first rolling part 21 and the second rolling part 22, but also the third rolling part 23. The third rolling part 23 is located between the two second rolling parts 22, and the third rolling part 23 is arranged adjacent to the two second rolling parts 22. The elastic sleeve 20 is configured such that if the second rolling part 22 and the third rolling part 23 are deformed to the same thickness in the radial direction, the elastic force generated by the second rolling part 22 is greater than the elastic force generated by the third rolling part 23.

[0088] During the process of laminating the film material, the pressure applied by the first rolling part 21 to the film material is greater than the pressure applied by the second rolling part 22, and the pressure applied by the second rolling part 22 to the film material is greater than the pressure applied by the third rolling part 23. In a foldable electronic device, there may be some structures with sharp protrusions in the folding hinge, such as the torsion spring 1023 in the folding hinge 102. The contact area between these protrusions and the display panel is small. During the process of laminating the film material, a relatively small pressure is applied by the third rolling part 23 at the front of the display panel opposite to the protrusion to avoid excessive pressure applied by the protrusion to the display panel, thereby damaging the display panel.

[0089] Fig.15 Schematic diagram of the structure of a film laminating roller provided in an embodiment of the present application. Fig.15As shown, in this example, the multiple rolling parts include 3 first rolling parts 21, 4 second rolling parts 22 and 2 third rolling parts 23, and the multiple rolling parts are distributed from one end of the roller shaft 10 to the other end as follows: first rolling part 21, second rolling part 22, third rolling part 23, second rolling part 22, first rolling part 21, second rolling part 22, third rolling part 23, second rolling part 22, first rolling part 21. In a foldable electronic device, there may be more than one sharp protrusion in the folding hinge, and the number and position of the third rolling part 23 can be set according to the distribution of the protrusions.

[0090] Fig.16 Schematic diagram of the structure of a film laminating roller provided in an embodiment of the present application. Fig.16 As shown, in this example, the multiple rolling parts include 5 first rolling parts 21, 6 second rolling parts 22 and 2 third rolling parts 23, and the multiple rolling parts are distributed from one end of the roller shaft 10 to the other end: the first rolling part 21, the second rolling part 22, the first rolling part 21, the second rolling part 22, the third rolling part 23, the second rolling part 22, the first rolling part 21, the second rolling part 22, the third rolling part 23, the second rolling part 22, the first rolling part 21, the second rolling part 22, and the first rolling part 21.

[0091] In some foldable electronic devices, the folding hinge may be connected to each supporting body with two or more swing arms. Fig.16 When the film material laminating roller is laminating the film material, two of the five first rolling parts 21 can apply relatively large pressure respectively at the position opposite to the two swing arms on the front of the display panel, so that the film material and the display panel are closely laminated. The two first rolling parts 21 are the second first rolling part 21 and the fourth first rolling part 21 counted from one end of the roller shaft 10 to the other end.

[0092] The structure of the third rolling part 23 may include one sleeve or two sleeves sleeved together. Fig.16 As shown, in this example, the first rolling part 21 includes a first sleeve 211, the second rolling part 22 includes a fourth sleeve 222 and a second sleeve 221 sleeved outside the fourth sleeve 222, the third rolling part 23 includes a fifth sleeve 232 and a sixth sleeve 231 sleeved outside the fifth sleeve 232, and the first sleeve 211, the fourth sleeve 222, and the fifth sleeve 232 are an integral structure. The outer diameter of the fourth sleeve 222 is equal to the outer diameter of the fifth sleeve 232, and the outer diameter of the first sleeve 211, the outer diameter of the second sleeve 221, and the outer diameter of the sixth sleeve 231 are equal.

[0093] Since the fourth sleeve 222 and the fifth sleeve 232 are an integral structure, the third rolling portion 23 is arranged adjacent to the second rolling portion 22, that is, when assembling the film material bonding roller, the positions of the second sleeve 221 and the sixth sleeve 231 can be interchanged to change the position of the third rolling portion 23, so that the film material bonding roller can better match electronic devices with different structures.

[0094] exist Fig.16 In the film laminating roller shown, the outer diameters of the rolling parts are the same, so that when the rolling parts press the film material onto the surface of the display panel, the deformation amounts generated by the rolling parts at different positions are the same. In other examples, the outer diameters of the first sleeve 211, the second sleeve 221, and the sixth sleeve 231 may also be different.

[0095] Exemplarily, the first sleeve 211, the second sleeve 221, the third sleeve 212, the fourth sleeve 222, the fifth sleeve 232, and the sixth sleeve 231 can be made of elastic materials such as resin, rubber, and foam. Sleeves with the same elastic modulus can be made of the same material, such as resin with the same chemical composition, and sleeves with different elastic moduli can be made of different materials, which can be resin, rubber, foam, etc., respectively, or they can all be resin, but resins with different chemical compositions are used.

[0096] Fig.17 Schematic diagram of the structure of a film laminating device provided in an embodiment of the present application. Fig.17 As shown, the film material laminating device comprises a frame 160 and a film material laminating roller. The film material laminating roller can be any of the aforementioned film material laminating rollers. Both ends of the roller shaft 10 of the film material laminating roller are rotatably connected to the frame 160. Both ends of the roller shaft 10 can be rotatably connected to the frame 160 through bearings 163 so that the roller shaft 10 can rotate flexibly.

[0097] As an example, the frame 160 may include a placement table 161 and a movable bracket 162, and both ends of the roller 10 are rotatably connected to the movable bracket 162. The placement table 161 is used to carry the electronic device to be laminated with the film material, and the movable bracket 162 is used to drive the roller 10 to approach or move away from the placement table 161, and drive the roller 10 to move in a direction parallel to the surface of the placement table 161 to fit the film material.

[0098] Fig.17 Only the movable bracket 162 is schematically shown in the figure. The structure of the movable bracket 162 only needs to be able to drive the roller 10 to move closer to or farther from the placement table 161 and to drive the roller 10 to move so as to perform film bonding.

[0099] The above description is only an embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A film laminating roller, characterized in that: The invention comprises a roller shaft (10) and an elastic sleeve (20), wherein the elastic sleeve (20) is sleeved outside the roller shaft (10), the elastic sleeve (20) comprises a plurality of coaxially arranged rolling parts, the plurality of rolling parts comprise at least one first rolling part (21) and at least one second rolling part (22), and the elastic sleeve (20) is configured such that, if the first rolling part (21) and the second rolling part (22) are deformed to the same thickness along the radial direction, the elastic force generated by the first rolling part (21) is greater than the elastic force generated by the second rolling part (22).

2. The film laminating roller according to claim 1, characterized in that: The elastic modulus of the first rolling portion (21) is greater than the elastic modulus of the second rolling portion (22).

3. The film laminating roller according to claim 2, characterized in that: The first rolling part (21) comprises a first sleeve (211), and the second rolling part (22) comprises a second sleeve (221); the first sleeve (211) and the second sleeve (221) are respectively sleeved outside the roller shaft (10); and the elastic modulus of the first sleeve (211) is greater than the elastic modulus of the second sleeve (221).

4. The film laminating roller according to claim 3, characterized in that: The first rolling part (21) further comprises a third sleeve (212), wherein the third sleeve (212) is sleeved outside the roller shaft (10), and the first sleeve (211) is sleeved outside the third sleeve (212), and the elastic modulus of the third sleeve (212) is the same as the elastic modulus of the second sleeve (221).

5. The film laminating roller according to claim 4, characterized in that: The third sleeve (212) and the second sleeve (221) are an integral structure.

6. The film laminating roller according to claim 3, characterized in that: The second rolling part (22) further comprises a fourth sleeve (222), wherein the fourth sleeve (222) is sleeved outside the roller shaft (10), and the second sleeve (221) is sleeved outside the fourth sleeve (222), and the elastic modulus of the fourth sleeve (222) is the same as the elastic modulus of the first sleeve (211).

7. The film laminating roller according to any one of claims 2 to 6, characterized in that: The natural thickness of the first rolled portion (21) is greater than the natural thickness of the second rolled portion (22).

8. The film laminating roller according to claim 1, characterized in that: The elastic modulus of the first rolled portion (21) is the same as the elastic modulus of the second rolled portion (22), and the natural thickness of the first rolled portion (21) is greater than the natural thickness of the second rolled portion (22).

9. The film laminating roller according to any one of claims 1 to 8, characterized in that: The plurality of rolling parts include at least two first rolling parts (21), and the rolling parts other than the two first rolling parts (21) among the plurality of rolling parts are all located between the two first rolling parts (21).

10. The film laminating roller according to any one of claims 1 to 8, characterized in that: The plurality of rolling parts include at least two second rolling parts (22), and at least one first rolling part (21) among the plurality of rolling parts is located between the two second rolling parts (22) and is arranged adjacent to the two second rolling parts (22).

11. The film laminating roller according to any one of claims 1 to 8, characterized in that: The plurality of rolling parts include at least two second rolling parts (22), and the plurality of rolling parts also include at least one third rolling part (23). At least one third rolling part (23) among the plurality of rolling parts is located between the two second rolling parts (22) and is arranged adjacent to the two second rolling parts (22). The elastic sleeve (20) is configured such that, if the second rolling part (22) and the third rolling part (23) are deformed to the same thickness along the radial direction, the elastic force generated by the second rolling part (22) is greater than the elastic force generated by the third rolling part (23).

12. A film laminating device, characterized in that: It comprises a frame (160) and a film material laminating roller as claimed in any one of claims 1 to 11, wherein both ends of a roller shaft (10) of the film material laminating roller are rotatably connected to the frame (160).

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