Curved surface fitting method

Abstract

The present application relates to a method for curved surface fitting. The method for curved surface fitting includes: placing an optical element on a carrier, and making the side of the optical element with the film-attaching curved surface face away from the carrier; then placing the optical film in an initial state on the carrier, and making the outer periphery of the fitting portion of the optical film coincide with the outer edge of the optical element; in the initial state, along the radial direction of the optical element, the distance between the outer periphery of the flat portion and the fitting portion is greater than nD, where n is greater than or equal to 3; the maximum distance along the axial direction of the optical element between the film-attaching curved surface and the outer edge of the optical element is D; using a fixing portion to fix the outer periphery of the flat portion relative to the carrier, and then using a pressing member to move relative to the carrier along the axial direction of the optical element, so that the fitting portion of the optical film is deformed under the action of the pressing member and thus fits the film-attaching curved surface. The above method for curved surface fitting improves the central strain concentration of the optical film and thus improves the optical properties.

Description

Technical Field

[0001] The present application relates to the technical field of film laminating equipment, and particularly to a method for curved surface lamination. Background Art

[0002] To endow an optical element with specific optical properties to meet application requirements, it is necessary to laminate an optical film onto the optical element. To achieve curved surface lamination, a curved surface laminating device is provided in the related art. The curved surface laminating device first fixes the optical film relative to the optical element, and then deforms the optical film to laminate it onto the optical element.

[0003] However, in the curved surface lamination method in the related art, the optical properties of the optical film are easily adversely affected after the optical film is laminated onto the optical element. Summary of the Invention

[0004] Based on this, in view of the problem that the optical properties of the optical film are easily adversely affected after the optical film is laminated onto the optical element in the curved surface lamination method in the related art, it is necessary to provide a curved surface lamination method that can improve the optical properties of the optical film after it is laminated onto the optical element.

[0005] According to one aspect of the present application, there is provided a curved surface lamination method for laminating an optical film onto an optical element. One side of the optical element along its axial direction has a film laminating curved surface, and the maximum distance along the axial direction of the optical element between the film laminating curved surface and the outer edge of the optical element is D; the optical film has a laminating portion for laminating onto the film laminating curved surface and a flat portion surrounding the laminating portion. The optical film has an initial state, in which the outer periphery of the laminating portion coincides with the outer edge of the optical element; the equipment applied to the curved surface lamination method includes:

[0006] A carrier for supporting the flat portion of the optical film and the optical element;

[0007] A fixing portion provided on the carrier for fixing the outer periphery of the flat portion relative to the optical element; and

[0008] A pressing member configured to be movable relative to the carrier along the axial direction of the optical element so that the laminating portion of the optical film laminates onto the film laminating curved surface;

[0009] The curved surface lamination method includes:

[0010] Placing the optical element on the carrier and making the side of the optical element with the film laminating curved surface face away from the carrier;

[0011] Then place the optical film in the initial state on the carrier, and make the outer periphery of the bonding part of the optical film coincide with the outer edge of the optical element; wherein, in the initial state, along the radial direction of the optical element, the distance between the outer periphery of the flat part and the bonding part is greater than nD, and n is greater than or equal to 3;

[0012] Use the fixing part to fix the outer periphery of the flat part relative to the carrier, and then use the pressing part to move relative to the carrier along the axial direction of the optical element, so that the bonding part of the optical film is deformed under the action of the pressing part and thus fits the film pasting curved surface.

[0013] In the above-mentioned curved surface fitting method, by setting that in the initial state, along the radial direction of the optical element, the distance between the outer periphery of the flat part and the bonding part is greater than nD, and n is greater than or equal to 3, the size of the flat part of the optical film along the radial direction of the optical element is increased. Therefore, when using the pressing part to deform the optical film to fit the film pasting curved surface, more of the optical film participates in sharing the stretching amount after fitting the film pasting curved surface, thereby improving the situation where the strain is concentrated at the center of the optical film, and further improving the optical properties of the optical film after fitting the optical element.

[0014] In one embodiment, in the initial state, along the radial direction of the optical element, the distance between the outer periphery of the flat part and the bonding part is less than 10D.

[0015] In one embodiment, in the initial state, along the radial direction of the optical element, the distance between the outer periphery of the flat part and the bonding part is less than 4D.

[0016] In one embodiment, in the initial state, along the radial direction of the optical element, the distance from any point on the outer periphery of the flat part to the bonding part is equal.

[0017] In one embodiment, the film pasting curved surface is configured as a concave surface that is recessed away from the optical film along the axial direction of the optical element; or

[0018] The film pasting curved surface is configured as a convex surface that protrudes towards the optical film along the axial direction of the optical element.

[0019] In one embodiment, the thickness of the optical film is less than 0.01D.

[0020] In one embodiment, the optical film includes one layer of optical sub-film; or

[0021] The optical film includes multiple layers of optical sub-films stacked along the axial direction of the optical element.

[0022] In one embodiment, the material of the optical film is metal or polymer.

[0023] In one embodiment, the carrier includes a first jig for supporting the flat portion of the optical film and the optical element;

[0024] The fixing portion includes a second jig disposed opposite to the first jig along the axial direction of the optical element, and the second jig is used to press and fix the outer periphery of the flat portion of the optical film to the first jig.

[0025] In one embodiment, the fixing portion includes an adhesive layer provided on the carrier;

[0026] The adhesive layer surrounds the outside of the optical element and is spaced apart from the outer edge of the optical element, and the adhesive layer is used to bond and fix the outer periphery of the flat portion.

[0027] In one embodiment, the fixing portion is configured as a plurality of vacuum adsorption holes provided on the carrier;

[0028] The plurality of vacuum adsorption holes are spaced apart from each other along the circumferential direction of the optical element and surround the outside of the optical element, and the vacuum adsorption holes are used to vacuum adsorb the outer periphery of the flat portion so that the outer periphery of the flat portion is fixed relative to the carrier. Description of the Drawings

[0029] Figure 1 It is a cross-sectional view of a curved surface fitting device, an optical element and an optical film in an initial state in the related art.

[0030] Figure 2 It is a strain distribution diagram of the optical film after being attached to the optical element in the related art.

[0031] Figure 3 It is a strain direction diagram of the optical film after being attached to the optical element in the related art.

[0032] Figure 4 It is a cross-sectional view of a device, an optical element and an optical film in an initial state applied to a curved surface fitting method in an embodiment of the present application.

[0033] Figure 5 For Figure 4 It is a cross-sectional view of a device, an optical element and a fitted optical film applied to a curved surface fitting method in the shown embodiment.

[0034] Figure 6 It is a strain distribution diagram of the optical film after being attached to the optical element in Comparative Example 1.

[0035] Figures 7a - 7eStrain distribution diagrams after the optical film is attached to the optical element in Embodiments 1 to 5.

[0036] Figure 8 Schematic diagrams of the maximum principal strain after the optical film is attached to the optical element in Embodiments 1 to 5 and Comparative Example 1.

[0037] Figure 9 Strain distribution diagram after the optical film is attached to the optical element in Comparative Example 2.

[0038] Figures 10a - 10e Strain distribution diagrams after the optical film is attached to the optical element in Embodiments 6 to 10.

[0039] Figure 11 Schematic diagrams of the maximum principal strain after the optical film is attached to the optical element in Embodiments 6 to 10 and Comparative Example 2.

[0040] Figures 12a - 12c Strain distribution diagrams after the optical film is attached to the optical element in Embodiments 11 to 13.

[0041] Figure 13 Schematic diagram of the strain at the center of the optical film after the optical film is attached to the optical element in Embodiments 11 to 13.

[0042] Figures 14a - 14c Strain distribution diagrams after the optical film is attached to the optical element in Embodiments 14 to 16.

[0043] Figure 15 Schematic diagram of the strain at the center of the optical film after the optical film is attached to the optical element in Embodiments 14 to 16.

[0044] Figure 16 Cross-sectional views of the device, optical element, and optical film in the initial state applied to the curved surface attachment method in an embodiment of the present application.

[0045] Figure 17 Cross-sectional views of the device, optical element, and optical film in the initial state applied to the curved surface attachment method in another embodiment of an embodiment of the present application.

[0046] Figure 18 Cross-sectional views of the device, optical element, and optical film in the initial state applied to the curved surface attachment method in another embodiment of an embodiment of the present application.

[0047] Brief description of component symbols:

[0048] 1, 100, device applied to the curved surface attachment method; 2, 10, carrier

[0049] 11, first jig; 20, fixing part

[0050] 21. Second jig 22. Adhesive layer

[0051] 23. Vacuum adsorption hole 3, 30. Pressing member

[0052] 4, 200. Optical film 201. Bonding part

[0053] 202. Laying - flat part 5, 300. Optical element

[0054] 6, 301. Film - pasting curved surface Detailed implementation manners

[0055] To make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the following describes the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0056] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counter - clockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0057] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plural", the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0058] In this application, unless otherwise clearly specified or limited, if terms such as "installed", "connected", "linked", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In this application, unless otherwise clearly specified or limited, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal level than the second feature.

[0060] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0061] Figure 1 is a cross-sectional view of a curved surface laminating device, an optical element and an optical film in an initial state in the related art; Figure 2 is a strain distribution diagram after the optical film is laminated on the optical element in the related art; Figure 3 is a strain direction diagram after the optical film is laminated on the optical element in the related art.

[0062] is to laminate the optical film 4 on the laminating curved surface 6 of the optical element 5, as Figure 1As shown, in the related art, a curved surface laminating device 1 is provided. The curved surface laminating device 1 includes a carrier 2 for supporting an optical element 5. During lamination, first, the undeformed optical film 4 is opposed to the optical element 5, and the outer periphery of the optical film 4 is supported by the carrier 2 and fixed relative to the carrier 2. Then, the pressing member 3 is used to deform the optical film 4 so as to laminate it on the film attaching curved surface 6 of the optical element 5. However, the curved surface laminating method in the related art includes: after laminating the optical film 4 on the optical element 5 by using the above-mentioned curved surface laminating device 1, it is easy to cause adverse effects on the optical properties of the optical film 4. For example, it is easy to affect the surface profile undulation, waviness, etc. of the optical film 4 after being laminated on the optical element 5.

[0063] Therefore, the inventor of the present application has conducted research and found by measuring the maximum principal strain of the optical film 4 after being laminated on the optical element 5 by using DIC (Digital Image Correlation) that the reason for the above problem is that after laminating the optical film 4 and the optical element 5 by using the above-mentioned curved surface laminating device 1, there is often a phenomenon that strain is concentrated at the center of the optical film 4, resulting in poor optical properties of the laminated optical film 4.

[0064] Therefore, it is necessary to provide a curved surface laminating method that can improve the optical properties of the optical film after being laminated on the optical lens.

[0065] Figure 4 It is a sectional view of the device, optical element and optical film in the initial state applied to the curved surface laminating method in an embodiment of the present application; Figure 5 is Figure 4 It is a sectional view of the device, optical element and laminated optical film in the shown embodiment applied to the curved surface laminating method.

[0066] Referring to Figures 4 - 5 , a device 100 applied to the curved surface laminating method provided in an embodiment of the present application is used to laminate an optical film 200 on an optical element 300. One side of the optical element 300 along its axis has a film attaching curved surface 301, and the maximum distance along the axis of the optical element 300 between the film attaching curved surface 301 and the outer edge of the optical element 300 is D. The optical film 200 has a attaching portion 201 for attaching to the film attaching curved surface 301 and a flat portion 202 surrounding the attaching portion 201. The optical film 200 has an initial state. In the initial state (see Figure 4 ), the outer periphery of the attaching portion 201 coincides with the outer edge of the optical element 300. The device 100 applied to the curved surface laminating method includes a carrier 10, a fixing portion 20 and a pressing member 30.

[0067] The carrier 10 is used to support the flat part 202 of the optical film 200 and the optical element 300. The fixing part 20 is provided on the carrier 10 to fix the outer periphery of the flat part 202 relative to the optical element 300. The pressing part 30 is configured to be movable relative to the carrier 10 along the axial direction of the optical element 300 so that the bonding part 201 of the optical film 200 adheres to the film - attaching curved surface 301. Wherein, in the initial state, along the radial direction of the optical element 300, the distance W between the outer periphery of the flat part 202 and the bonding part 201 is greater than nD, and n is greater than or equal to 3.

[0068] The device 100 applied to the curved - surface bonding method as described above provides a supporting effect for the flat part 202 of the optical film 200 and the optical element 300 respectively by setting the carrier 10. By setting the fixing part 20 on the carrier 10, when the optical film 200 is bonded to the optical element 300, the outer periphery of the flat part 202 of the optical film 200 is fixed relative to the optical element 300, so that the optical film 200 is positioned relative to the optical element 300 during bonding, which is beneficial to bonding and improving the bonding effect. By setting the pressing part 30, after the outer periphery of the flat part 202 of the optical film 200 is fixed relative to the optical element 300, the bonding part 201 of the optical film 200 can be deformed under the action of the pressing part 30 through the movement of the pressing part 30 relative to the carrier 10 along the axial direction of the optical element 300, so that the bonding part 201 of the optical film 200 adheres to the film - attaching curved surface 301. Since in the initial state, along the radial direction of the optical element 300, the distance W between the outer periphery of the flat part 202 and the bonding part 201 is greater than nD, and n is greater than or equal to 3, the size of the flat part 202 of the optical film 200 along the radial direction of the optical element 300 increases, and the area of the flat part 202 of the optical film 200 increases. Therefore, when the optical film 200 is deformed by the pressing part 30 to adhere to the film - attaching curved surface 301, more of the optical film 200 participates in sharing the tensile amount after adhering to the film - attaching curved surface 301, thereby improving the situation where the strain is concentrated at the center of the optical film 200, reducing the influence of the strain concentration at the center of the optical film 200 on the peak - valley value, surface profile undulation, waviness, transmittance, reflectivity, etc. of the optical film 200, and improving the optical properties after the optical film 200 is bonded to the optical element 300.

[0069] It should be noted that, as Figure 4 shown, in the initial state, neither the bonding part 201 nor the flat part 202 of the optical film 200 is deformed.

[0070] During actual use, first place the optical element 300 on the carrier 10, and make the side of the optical element 300 with the film-applying curved surface 301 face away from the carrier 10. Then place the optical film 200 in its initial state on the carrier 10, and make the outer periphery of the bonding portion 201 of the optical film 200 coincide with the outer edge of the optical element 300. Next, fix the outer periphery of the flat portion 202 relative to the carrier 10 by using the fixing portion 20, and then move the pressing member 30 axially relative to the carrier 10 along the optical element 300, so that the bonding portion 201 of the optical film 200 is deformed under the action of the pressing member 30 and thus adheres to the film-applying curved surface 301. After the adhesion is completed, the optical film 200 located outside the outer edge of the optical element 300 can be removed according to the usage requirements.

[0071] It should be understood that in the initial state, the distance W between the outer periphery of the optical film 200 and the bonding portion 201 is greater than or equal to nD, that is, the outer periphery of the optical film 200 can be the outer periphery of the flat portion 202, or the outer periphery of the optical film 200 can extend beyond the outer periphery of the flat portion 202, as long as the optical film 200 can be located between the fixing portion 20 and the carrier 10. The size of the optical film 200 is not limited herein. In addition, when the outer periphery of the optical film 200 extends beyond the outer periphery of the flat portion 202, the contour shape of the outer periphery of the optical film 200 is not limited.

[0072] It should be noted that the contour shape of the outer periphery of the flat portion 202 can also be set differently according to the usage requirements. For example, the contour shape of the outer periphery of the flat portion 202 can be square, rounded square, circular or elliptical, etc. The contour shape of the outer periphery of the flat portion 202 is not limited herein.

[0073] Figure 6 Strain distribution diagram of the optical film adhered to the optical element in Comparative Example 1; Figures 7a - 7e Strain distribution diagram of the optical film adhered to the optical element in Examples 1 to 5; Figure 8 Schematic diagram of the maximum principal strain of the optical film adhered to the optical element in Examples 1 to 5 and Comparative Example 1.

[0074] Optionally, the contour shape of the outer edge of the optical element 300 and the contour shape of the outer periphery of the flat portion 202 of the optical film 200 are both circular. Based on the flat portion 202 having different sizes along the radial direction of the optical element 300, different embodiments are provided: in Embodiments 1 to 5, the diameters of the outer peripheries of the flat portions 202 of the optical film 200 are 70 mm, 90 mm, 110 mm, 130 mm, and 150 mm respectively. In Comparative Example 1, the contour shape of the outer edge of the optical element 300 and the contour shape of the outer periphery of the flat portion 202 of the optical film 200 are both circular, and the diameter of the outer periphery of the flat portion 202 is 50 mm. From Figure 6 , Figures 7a - 7e and Figure 8 it can be seen that after the optical film 200 is attached to the optical element 300, the maximum principal strains of the optical film 200 in Embodiments 1 to 5 are all smaller than the maximum principal strain of the optical film 200 in Comparative Example 1. Therefore, by increasing the size of the flat portion 202 along the radial direction of the optical element 300, it is beneficial to reduce the maximum principal strain after the optical film 200 is attached to the optical element 300, that is, it can improve the situation where the strain is concentrated at the center of the optical film 200, thereby being beneficial to improving the optical properties after the optical film 200 is attached to the optical element 300.

[0075] It should be noted that the maximum principal strain refers to the strain in the direction where the shear strain of the optical film 200 is 0.

[0076] Figure 9 is the strain distribution diagram of the optical film attached to the optical element in Comparative Example 2; Figures 10a - 10e is the strain distribution diagram of the optical film attached to the optical element in Embodiments 6 to 10; Figure 11 is the schematic diagram of the maximum principal strain of the optical film attached to the optical element in Embodiments 6 to 10 and Comparative Example 2.

[0077] Optionally, the contour shape of the outer edge of the optical element 300 is circular, and the contour shape of the outer periphery of the flat portion 202 of the optical film 200 is square. Based on the flat portion 202 having different sizes along the radial direction of the optical element 300, different embodiments are provided: in Embodiments 6 to 10, the side lengths of the outer peripheries of the flat portions 202 of the optical film 200 are 70 mm, 90 mm, 110 mm, 130 mm, and 150 mm respectively. In Comparative Example 2, the contour shape of the outer edge of the optical element 300 is circular, the contour shape of the outer periphery of the flat portion 202 of the optical film 200 is square, and the side length of the outer periphery of the flat portion 202 is 50 mm. From Figure 9 , Figures 10a - 10e and Figure 11It can be seen that after the optical film 200 is attached to the optical element 300, the maximum principal strain of the optical film 200 in Examples VI to X is smaller than that of the optical film 200 in Comparative Example II. For example, in Example X, the maximum principal strain after the optical film 200 is attached is 4.25%, compared with 4.75% of the maximum principal strain of the optical film 200 in Comparative Example II, which improves the maximum principal strain after the optical film 200 is attached to the optical element 300 by 10%. Therefore, by increasing the size of the flat part 202 along the radial direction of the optical element 300, it is beneficial to reduce the maximum principal strain after the optical film 200 is attached, that is, it can improve the situation where the strain is concentrated at the center of the optical film 200, thereby being beneficial to improving the optical properties of the optical film 200 after being attached to the optical element 300.

[0078] In some embodiments, in the initial state, along the radial direction of the optical element 300, the distance W between the outer periphery of the flat part 202 and the attachment part 201 is less than 10D, so as to allow the optical film 200 to have a smaller size in design, thereby reducing the material waste of the optical film 200.

[0079] Furthermore, in the initial state, along the radial direction of the optical element 300, the distance W between the outer periphery of the flat part 202 and the attachment part 201 is less than 4D. It should be noted that the inventor found through simulation prediction that when the distance W between the outer periphery of the flat part 202 and the attachment part 201 along the radial direction of the optical element 300 is greater than 4D in the initial state, the change in the size of the outer periphery of the flat part 202 along the radial direction of the optical element 300 has a small impact on the maximum principal strain after the optical film 200 is attached. Therefore, by setting the distance W between the outer periphery of the flat part 202 and the attachment part 201 along the radial direction of the optical element 300 to be less than 4D in the initial state, it is possible to allow the size of the optical film 200 along the radial direction of the optical element 300 to be reduced in design, that is, it is beneficial to reduce the material of the optical film 200 used for attachment to the optical element 300, beneficial to reducing the cost, and the maximum principal strain of the optical film 200 after being attached to the optical element 300 is smaller, so that the optical film 200 after being attached to the optical element 300 has better optical properties.

[0080] Figures 12a - 12c FIG. is the strain distribution diagram of the optical film after being attached to the optical element in Examples XI to XIII; Figure 13 FIG. is a schematic diagram of the strain at the center of the optical film after the optical film in Examples XI to XIII is attached to the optical element.

[0081] Optionally, the contour shape of the outer edge of the optical element 300 and the contour shape of the outer periphery of the flat portion 202 of the optical film 200 are both circular. Based on the flat portion 202 having different sizes in the radial direction of the optical element 300, different embodiments are provided: in Embodiments Eleven to Thirteen, the outer diameters of the outer periphery of the flat portion 202 are L + 8D, L + 12D, and L + 16D respectively, where L is the radial dimension of the outer edge of the optical element 300. That is, in the initial state, along the radial direction of the optical element 300, the distances W between the outer periphery of the flat portion 202 and the bonding portion 201 in Embodiments Eleven to Thirteen are 4D, 6D, and 8D respectively. From Figures 12a - 12c and Figure 13 it can be seen that after the optical film 200 is bonded to the optical element 300, the difference between the maximum principal strains of the optical film 200 in Embodiments Eleven to Thirteen is small. Therefore, when setting the distance W between the outer periphery of the flat portion 202 of the optical film 200 and the bonding portion 201 along the radial direction of the optical element 300 in the initial state to be greater than 3D and less than 4D, it is beneficial to save the material of the optical film 200 and make the optical film 200 have good optical properties after being bonded to the optical element 300.

[0082] Figures 14a - 14c FIG. is the strain distribution diagram of the optical film after being bonded to the optical element in Embodiments Fourteen to Sixteen; Figure 15 FIG.

[0082] is a schematic diagram of the strain at the center of the optical film after the optical film is bonded to the optical element in Embodiments Fourteen to Sixteen.

[0083] Optionally, the contour shape of the outer edge of the optical element 300 is circular, and the contour shape of the outer periphery of the flat portion 202 of the optical film 200 is square. Based on the flat portion 202 having different sizes in the radial direction of the optical element 300, different embodiments are provided: in Embodiments Fourteen to Sixteen, the side lengths of the outer periphery of the flat portion 202 are L + 8D, L + 12D, and L + 16D respectively, where L is the radial dimension of the outer edge of the optical element 300. From Figures 14a - 14c and Figure 15 it can be seen that after the optical film 200 is bonded to the optical element 300, the difference between the maximum principal strains of the optical film 200 in Embodiments Fourteen to Sixteen is small. Therefore, when setting the distance W between the outer periphery of the flat portion 202 of the optical film 200 and the bonding portion 201 along the radial direction of the optical element 300 in the initial state to be greater than 3D and less than 4D, it is beneficial to save the material of the optical film 200 and make the optical film 200 have good optical properties after being bonded.

[0084] In one embodiment, L is 50 mm and D is 5 mm. In other embodiments, the sizes of L and D can also be set to other values according to application requirements, and the sizes of L and D are not limited herein.

[0085] In some embodiments, in the initial state, along the radial direction of the optical element 300, the distance W between any point on the outer periphery of the flat part 202 and the fitting part 201 is equal. In this way, the contour shape of the outer periphery of the flat part 202 is adapted to the contour shape of the outer edge of the optical element 300, which is further conducive to saving the material of the optical film 200 and thus reducing the cost.

[0086] Optionally, the contour shape of the outer edge of the optical element 300 and the contour shape of the outer periphery of the flat part 202 of the optical film 200 can be set to be both circular, both square, both elliptical, etc., which are not limited herein.

[0087] In other embodiments, in the initial state, the distance W along the radial direction of the optical element 300 between any point on the outer periphery of the flat part 202 and the fitting part 201 may not be equal.

[0088] In some embodiments, the thickness of the optical film 200 is less than 0.01D, so that the optical film 200 has a smaller thickness, which is convenient for more smoothly fitting the optical film 200 onto the film attaching curved surface 301 of the optical element 300, and can further improve the situation where the strain is concentrated at the center of the optical film 200 after fitting.

[0089] In some embodiments, the optical film 200 includes one layer of optical sub-film.

[0090] It should be noted that the type of the optical sub-film can be set according to the application requirements of the optical element 300. For example, the optical sub-film can be a reflective film, a beam splitting film, an anti-reflection film, etc., and the type of the optical sub-film is not limited herein.

[0091] In other embodiments, the optical film 200 includes multiple layers of optical sub-films stacked along the axial direction of the optical element 300, so that the optical element 300 can have different optical characteristics through different optical sub-films. During actual use, the multiple layers of optical sub-films can be first stacked and connected, and then the stacked and connected multiple layers of optical sub-films can be attached to the optical element 300 by using the device 100 applied to the curved surface attaching method.

[0092] Optionally, the sum of the thicknesses of the multiple layers of optical sub-films along the axial direction of the optical element 300 is less than 0.01D.

[0093] In some embodiments, the material of the optical film 200 is metal. For example, when aluminum, gold, silver, platinum or chromium, etc. are evaporated on a polished glass substrate, it can become a mirror.

[0094] In some other embodiments, the material of the optical film 200 is a polymer. Optionally, the material of the optical film 200 may be PMMA (poly(methylmethacrylate)), PC (Polycarbonate), PS (Polystyrene), PET (Polyethylene terephthalate), PVA (Polyvinyl alcohol), TAC (Triacetyl Cellulose), COP (Cyclo Olefin Polymer), or PI (Polyimide), etc.

[0095] Figure 16 A cross-sectional view of a device, an optical element, and an optical film in an initial state applied to a curved surface fitting method in an embodiment of the present application; Figure 17 A cross-sectional view of a device, an optical element, and an optical film in an initial state applied to a curved surface fitting method in another embodiment of an embodiment of the present application.

[0096] In some embodiments, as Figures 16 - 17 shown, the film-applying curved surface 301 is configured as a concave surface that is recessed away from the optical film 200 along the axial direction of the optical element 300, or the film-applying curved surface 301 is configured as a convex surface that protrudes toward the optical film 200 along the axial direction of the optical element 300. In this way, the device 100 applied to the curved surface fitting method can be respectively applied to the film-applying curved surface 301 that is concave or convex.

[0097] In some embodiments, as Figure 16 shown, the carrier 10 includes a flat part 202 for supporting the optical film 200 and a first jig 11 for the optical element 300. The fixing part 20 includes a second jig 21 that is disposed opposite to the first jig 11 along the axial direction of the optical element 300, and the second jig 21 is used to press and fix the outer periphery of the flat part 202 of the optical film 200 to the first jig 11.

[0098] During actual use, the outer periphery of the flat part 202 of the optical film 200 is pressed and fixed to the first jig 11 by the second jig 21, and then the optical film 200 is attached to the film-applying curved surface 301 of the optical element 300 by the pressing member 30.

[0099] Optionally, the second jig 21 is configured to be annular and is configured to fit the outer periphery of the flat part 202 of the optical film 200. For example, the radial dimension of the second jig 21 fits the radial dimension of the outer periphery of the flat part 202, and the shape of the second jig 21 fits the shape of the outer periphery of the flat part 202.

[0100] Specifically, the second fixture 21 is made of a flexible material to avoid damaging the optical film 200 when the second fixture 21 presses against the optical film 200. For example, the material of the second fixture 21 can be rubber.

[0101] In one embodiment, the second fixture 21 can be a rubber ring.

[0102] In some embodiments, the second fixture 21 is configured to be movable relative to the first fixture 11 along the axial direction of the optical element 300, so that the second fixture 21 and the first fixture 11 are spaced apart from each other along the axial direction of the optical element 300, or the outer periphery of the flat portion 202 of the optical film 200 is pressed and fixed between the second fixture 21 and the first fixture 11. In this way, it is convenient to place the optical film 200 on the first fixture 11 before bonding, and it is convenient to remove the optical film 200 from the first fixture 11 after the bonding is completed.

[0103] In other embodiments, as Figure 17 shown, the fixing portion 20 includes an adhesive layer 22 provided on the carrier 10. The adhesive layer 22 surrounds the outside of the optical element 300 and is spaced apart from the outer edge of the optical element 300. The adhesive layer 22 is used to bond and fix the outer periphery of the flat portion 202 of the optical film 200.

[0104] Figure 18 It is a cross-sectional view of the device, the optical element, and the optical film in the initial state applied to the curved surface bonding method in another embodiment of an embodiment of the present application.

[0105] In other embodiments, as Figure 18 shown, the fixing portion 20 is configured as a plurality of vacuum suction holes 23 provided on the carrier 10. The plurality of vacuum suction holes 23 are spaced apart from each other along the circumferential direction of the optical element 300 and surround the outside of the optical element 300. The vacuum suction holes 23 are used to vacuum-suck the outer periphery of the flat portion 202 of the optical film 200, so that the outer periphery of the flat portion 202 is fixed relative to the carrier 10.

[0106] Optionally, the optical element 300 is an optical lens.

[0107] In the present application, the optical element 300 after being bonded to the optical film 200 can be applied to various types of terminals. For example, the terminal can be glasses, AR (Augmented Reality) glasses, VR (Virtual Reality) glasses, or a lens, etc.

[0108] According to another aspect of the present application, a curved surface bonding method is provided, which uses the device 100 applied to the curved surface bonding method in any of the above embodiments for bonding.

[0109] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0110] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for curved surface fitting, which is used to fit an optical film onto an optical element, characterized in that, One side of the optical element along its axial direction has a film - attaching curved surface, and the maximum distance along the axial direction of the optical element between the film - attaching curved surface and the outer edge of the optical element is D; the optical film has a fitting portion for fitting to the film - attaching curved surface and a flat - lying portion surrounding the fitting portion. The optical film has an initial state, in which the outer periphery of the fitting portion coincides with the outer edge of the optical element. The device applied to the curved - surface fitting method includes: A carrier for supporting the flat - lying portion of the optical film and the optical element; A fixing portion provided on the carrier for fixing the outer periphery of the flat - lying portion relative to the optical element; and A pressing member configured to be movable relative to the carrier along the axial direction of the optical element so that the fitting portion of the optical film fits to the film - attaching curved surface; The curved - surface fitting method includes: Placing the optical element on the carrier with the side having the film - attaching curved surface facing away from the carrier; Then placing the optical film in the initial state on the carrier and making the outer periphery of the fitting portion of the optical film coincide with the outer edge of the optical element; wherein, in the initial state, along the radial direction of the optical element, the distance between the outer periphery of the flat - lying portion and the fitting portion is greater than nD, and n is greater than or equal to 3; Using the fixing portion to fix the outer periphery of the flat - lying portion relative to the carrier, and then using the pressing member to move relative to the carrier along the axial direction of the optical element, so that the fitting portion of the optical film is deformed under the action of the pressing member and fits to the film - attaching curved surface.

2. The curved surface fitting method according to claim 1, wherein In the initial state, along the radial direction of the optical element, the distance between the outer periphery of the flat - lying portion and the fitting portion is less than 10D.

3. The curved surface fitting method according to claim 2, characterized in that In the initial state, along the radial direction of the optical element, the distance between the outer periphery of the flat - lying portion and the fitting portion is less than 4D.

4. The curved surface fitting method according to claim 1, characterized in that, In the initial state, along the radial direction of the optical element, the distance from any point on the outer periphery of the flat - lying portion to the fitting portion is equal.

5. The curved surface fitting method according to claim 1, characterized in that The film - attaching curved surface is configured as a concave surface that is recessed away from the optical film along the axial direction of the optical element; or The film - attaching curved surface is configured as a convex surface that protrudes towards the optical film along the axial direction of the optical element.

6. The curved surface fitting method according to claim 1, wherein The thickness of the optical film is less than 0.01D.

7. The curved surface fitting method according to claim 1, wherein The optical film includes one layer of optical sub - film; or The optical film includes multiple layers of optical sub - films stacked along the axial direction of the optical element.

8. The curved surface fitting method according to claim 1, wherein The material of the optical film is metal or polymer.

9. The curved surface fitting method according to any one of claims 1 to 8, characterized in that, The carrier includes a first jig for supporting the flat - lying portion of the optical film and the optical element; The fixing portion includes a second jig disposed opposite to the first jig along the axial direction of the optical element, and the second jig is used to press - fix the outer periphery of the flat - lying portion of the optical film to the first jig.

10. The curved surface fitting method according to any one of claims 1 to 8, characterized in that, The fixing portion includes an adhesive layer provided on the carrier; The bonding layer surrounds the outer side of the optical element and is disposed at an interval from the outer edge of the optical element, and the bonding layer is used for adhesively fixing the outer periphery of the flat portion.

11. The curved surface fitting method according to any one of claims 1 to 8, characterized in that, The fixing portion is configured as a plurality of vacuum suction holes provided on the carrier; The plurality of vacuum suction holes surround the outer side of the optical element at intervals along the circumferential direction of the optical element, and the vacuum suction holes are used for vacuum-sucking the outer periphery of the flat portion so that the outer periphery of the flat portion is fixed relative to the carrier.

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