Preparation method and preparation device of lens module and lens module

Abstract

The invention discloses a preparation method and a preparation device of a lens module and the lens module. The preparation method of the lens module comprises the steps that a positioning ring is provided, the inner surface of the positioning ring comprises at least two annular positioning grooves arranged at intervals, and the at least two positioning grooves and the positioning ring are coaxial; a first optical lens is provided, the first optical lens comprises a body part and an installation part which are connected, and the positioning groove and the installation part are matched in shape; mounting a plurality of first optical lenses to the plurality of positioning grooves respectively, wherein a molding cavity is formed between the body parts of the adjacent first optical lenses; and casting is conducted from a casting opening formed in the positioning ring, so that the casting material enters the molding cavity, the casting material in the molding cavity forms a second optical lens, and the second optical lens and the first optical lens form the lens module. The first optical lenses can be coaxially arranged, so that the second optical lens and the first optical lenses can be coaxially arranged, and the eccentric difference and the inclination difference between the optical lenses can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of lens module preparation, and more specifically, to a lens module preparation method, a preparation device and a lens module. Background Art

[0002] The folded optical path (pancake) solution uses a semi-transparent and semi-reflective polarizing film lens system to fold the optical path. The light is folded back and forth multiple times between the phase delay plate and the reflective polarizer in a single or multi-piece optical lens, and finally emitted from the reflective polarizer into the human eye. When the multi-piece optical lens is fixed by gluing and lens barrel, eccentricity and tilt differences between the optical lenses will be generated. When the tilt and eccentricity are serious, it will lead to the loss of the final optical imaging. Therefore, a solution that can reduce the eccentricity and tilt differences of the multi-piece optical lens is urgently needed. Summary of the invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art, so as to solve the problem of large eccentricity difference and tilt difference of a multi-piece optical lens.

[0004] According to the first aspect of the present disclosure, a method for preparing a lens module includes providing a positioning ring, the inner surface of the positioning ring includes at least two annular positioning grooves arranged at intervals, and the at least two positioning grooves are coaxial with the positioning ring; providing a first optical lens, the first optical lens includes a connected main body and a mounting portion, and the shapes of the positioning groove and the mounting portion match; installing a plurality of the first optical lenses to the plurality of positioning grooves respectively, and forming a molding cavity between the main bodies of adjacent first optical lenses; casting from a casting port opened in the positioning ring so that a casting material enters the molding cavity, and the casting material in the molding cavity forms a second optical lens, and the second optical lens and the first optical lens form the lens module.

[0005] According to the second aspect of the present disclosure, the preparation device includes a positioning ring, which encloses a casting space, and the positioning ring is provided with a casting port connected to the casting space, and the inner surface of the positioning ring is provided with a plurality of positioning grooves.

[0006] According to the lens module of the third aspect embodiment of the present disclosure, the lens module is prepared by the preparation method described in any of the above embodiments. The preparation method includes providing a positioning ring, the inner surface of the positioning ring is provided with a plurality of positioning grooves, the plurality of positioning grooves are coaxially arranged, the first optical lens of the lens module includes a connected main body and a mounting portion, the positioning grooves and the mounting portion are matched in shape; a plurality of the first optical lenses are respectively installed to the plurality of positioning grooves, and a molding cavity is formed between the main bodies of adjacent first optical lenses; casting is performed from the casting port provided in the positioning ring so that the casting material enters the molding cavity, the casting material in the molding cavity forms a second optical lens, and the second optical lens and the first optical lens form the lens module.

[0007] In the preparation method, preparation device and lens module of the lens module of the disclosed embodiment, the shape of the positioning groove provided on the inner surface of the positioning ring matches the shape of the mounting portion of the first optical lens, so that the first optical lens can be fixedly installed in the positioning groove. The relative position between the plurality of positioning grooves can be specifically designed according to the pre-designed relative position relationship of the plurality of first optical lenses, which is conducive to the coaxial arrangement of the plurality of first optical lenses installed in the positioning grooves, thereby reducing the eccentricity difference and tilt difference between the plurality of first optical lenses. A molding cavity is formed between the bodies of adjacent first optical lenses, and after the casting material is injected into the molding cavity from the casting port, the casting material in the molding cavity can form a second optical lens, and the second optical lens and the first optical lens form a lens module. In the case where two adjacent first optical lenses are coaxially arranged, the second optical lens formed in the molding cavity between the two adjacent first optical lenses can also be coaxially arranged with the plurality of first optical lenses, which is conducive to reducing the eccentricity difference and tilt difference between the plurality of optical lenses in the lens module.

[0008] Additional aspects and advantages of the embodiments of the present disclosure will be given in part in the description below and in part will be obvious from the description below or will be learned through practice of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0010] Figure 1 is a schematic flow chart of a method for preparing a lens module according to some embodiments of the present disclosure;

[0011] Figure 2 is a schematic diagram of a scene of a method for preparing a lens module according to some embodiments of the present disclosure;

[0012] Figure 3 is a schematic diagram of a scene of a method for preparing a lens module according to some embodiments of the present disclosure;

[0013] Figure 4 is a schematic diagram of a scene of a method for preparing a lens module according to some embodiments of the present disclosure;

[0014] Figure 5 is a schematic flow chart of a method for preparing a lens module according to some embodiments of the present disclosure;

[0015] Figure 6 is a schematic flow chart of a method for preparing a lens module according to some embodiments of the present disclosure;

[0016] Figure 7 is a schematic diagram of a scene of a method for preparing a lens module according to some embodiments of the present disclosure;

[0017] Figure 8 is a schematic flow chart of a method for preparing a lens module according to some embodiments of the present disclosure;

[0018] Fig. 9 It is a schematic diagram of the structure of a lens module of certain embodiments of the present disclosure.

[0019] Reference numerals:

[0020] The lens module 100, the first optical lens 10, the main body 11, the mounting portion 12, the bottom surface 121, the side surface 122, the second optical lens 20, the optical film 30,

[0021] Preparation device 200, positioning ring 210, inner surface 211, second thread 2111, positioning groove 212, groove bottom 2121, groove wall 2122, casting space 213, molding cavity 2131, casting port 214, collar 220, first thread 221, positioning space 230, sealing member 240,

[0022] Casting material 300 and liquid crystal molecules 301 . DETAILED DESCRIPTION

[0023] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and cannot be understood as limiting the present disclosure.

[0024] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one feature. In the description of the present disclosure, the meaning of "plurality" is at least two, such as two, three, unless otherwise clearly and specifically defined.

[0026] The following describes a method for preparing a lens module, a preparation device 200 and a lens module 100 according to an embodiment of the present disclosure with reference to the accompanying drawings.

[0027] The light of the folded optical path solution is folded back and forth multiple times between the phase delay plate and the reflective polarizer, and finally emitted from the reflective polarizer into the human eye. The core idea is to compress the distance between the screen and the lens, and use multiple optical lenses to make the light path fold back multiple times, thereby expanding the total length of the light path so that it can achieve focus while expanding the field of view, thereby reducing the total length of the entire optical module. Compared with the aspheric lens and Fresnel lens solutions, the folded optical path solution compresses the distance between the screen and the lens, which greatly reduces the total track length (TTL) of the folded optical path solution. At present, the total length of the aspheric lens and Fresnel lens is about 40-50mm, and the total length of the lens of the folded optical path solution is basically about 18-25mm.

[0028] When generating a lens module of the folded optical path scheme, the current folded optical path scheme usually uses gluing and lens barrel methods to fix multiple optical lenses. For example, when fixing the multiple optical lenses, the optical lenses are placed in different molds for alignment and then fixed by gluing. However, the multiple molds may not be aligned, so the eccentricity difference and tilt difference between the optical lenses appear. When the eccentricity and tilt are serious, the final optical imaging will be lost. Although the alignment problem can now be controlled by optical alignment, such as using the modulation transfer function (MTF) of the focus to achieve alignment, the use of optical alignment will increase the manufacturing cost, which is not convenient for mass production and application. To solve this problem, the present disclosure uses multiple positioning grooves 212 in the positioning ring 210 to achieve the coaxial arrangement of multiple first optical lenses 10, so that the second optical lens 20 can also be coaxially arranged with the multiple first optical lenses 10, thereby facilitating the reduction of the eccentricity difference and tilt difference between the multiple optical lenses in the lens module 100.

[0029] According to the method for preparing the lens module of the embodiment of the present disclosure, please refer to Figures 1 to 4 , including the following steps:

[0030] S1: providing a positioning ring 210, wherein an inner surface 211 of the positioning ring 210 comprises at least two annular positioning grooves 212 arranged at intervals, and the at least two positioning grooves 212 are coaxial with the positioning ring 210;

[0031] S2: providing a first optical lens 10, wherein the first optical lens 10 comprises a main body portion 11 and a mounting portion 12 connected to each other, and the positioning groove 212 and the mounting portion 12 match in shape;

[0032] S3: installing a plurality of first optical lenses 10 to a plurality of positioning grooves 212 respectively, and forming a molding cavity 2131 between the main bodies 11 of adjacent first optical lenses 10;

[0033] S4: Casting is performed from the casting port 214 opened in the positioning ring 210 so that the casting material 300 enters the molding cavity 2131 , and the casting material 300 in the molding cavity 2131 forms the second optical lens 20 , and the second optical lens 20 and the first optical lens 10 form the lens module 100 .

[0034] Specifically, the preparation method of the lens module can be used in a preparation device 200 for making the lens module 100. The preparation device 200 can provide a positioning ring 210, which encloses a casting space 213 and is provided with a casting port 214 connected to the casting space 213. After the casting material 300 is injected into the casting space 213 through the casting port 214, the preparation device 200 can generate the lens module 100. The inner surface 211 of the positioning ring 210 is also provided with at least two positioning grooves 212, and the at least two positioning grooves 212 and the positioning ring 210 are coaxially arranged, that is, each positioning groove 212 is parallel to the central axis of the positioning ring 210, and the axis is located on the same horizontal line.

[0035] The lens module 100 includes a first optical lens 10, which is an optical element made of a light-transmitting material (such as glass, plastic or crystal, etc.), and mainly uses the refraction of light to transmit light in the optical path of the lens module 100. The first optical lens 10 includes a main body portion 11 and a mounting portion 12 connected, wherein the shapes of the positioning groove 212 and the mounting portion 12 match, that is, the shapes of the contact surfaces of the positioning groove 212 and the mounting portion 12 that contact each other are the same, so that the positioning groove 212 and the mounting portion 12 can stably contact each other. For example, the positioning groove 212 includes a groove bottom 2121 and a groove wall 2122 connected, and the mounting portion 12 includes a bottom surface 121 and a side surface 122. When the bottom surface 121 of the mounting portion 12 fits with the groove bottom 2121, the contact surface of the bottom surface 121 and the contact surface of the groove bottom 2121 have the same shape and size. When the side surface 122 of the mounting portion 12 fits with the groove wall 2122, the contact surface of the side surface 122 and the contact surface of the groove wall 2122 have the same shape and size, so that the positioning groove 212 and the mounting portion 12 can fit completely. At this time, the movement of the side surface 122 and the bottom surface 121 of the mounting portion 12 will be restricted by the positioning groove 212. Then, after the mounting portion 12 is installed in the corresponding positioning groove 212, the preparation device 200 can achieve the fixation of the first optical lens 10. At the same time, the relative positions between the multiple positioning grooves 212 can be specifically designed according to the pre-designed relative position relationship of the multiple first optical lenses 10. For example, the relative positions between the multiple positioning grooves 212 can be specifically designed according to the thicknesses of different first optical lenses 10, so that while the coaxial setting of the positioning grooves 212 is achieved, it is also beneficial for the multiple first optical lenses 10 installed in the positioning grooves 212 to achieve coaxial setting.

[0036] The angle between the groove bottom 2121 and the groove wall 2122, and the angle between the bottom surface 121 and the side surface 122 of the mounting portion 12 are not restricted. For example, the angle between the groove bottom 2121 and the groove wall 2122 can be an acute angle, a right angle or an obtuse angle, and the angle between the bottom surface 121 and the side surface 122 of the mounting portion 12 can also be an acute angle, a right angle or an obtuse angle. It is only necessary to ensure that the angle between the groove bottom 2121 and the groove wall 2122 is equal to the angle between the bottom surface 121 and the side surface 122 of the mounting portion 12, so that when the bottom surface 121 of the mounting portion 12 and the groove bottom 2121 are in contact, the side surface 122 of the mounting portion 12 and the groove wall 2122 can also be in contact.

[0037] The positioning grooves 212 may all be annular grooves, but the specific shape of the annular grooves is not limited, and the preparation device 200 may be specifically configured according to the shape of the first optical lens 10. In one embodiment, the shape of the annular groove is circular, and the shape of the first optical lens 10 is circular. In another embodiment, the shape of the annular groove is rectangular, and the shape of the first optical lens 10 is rectangular.

[0038] The first optical lens 10 can be made by an injection molding process, and the basic process of the injection molding process includes raw material processing, mold closing, injection molding, V / P conversion (i.e., when the cavity is about to be filled during the injection molding filling process, the movement of the screw is converted from flow rate control to pressure control), pressure holding, cooling, mold opening, ejection and product removal. When generating the first optical lens 10, the preparation device 200 can inject a liquid monomer, such as methyl methacrylate (PMMA), cyclic olefin copolymer (COC / COP) or glass, between the concave mold and the convex mold, and then polymerize the injection molding material by heating and pressurizing to generate the first optical lens 10. Among them, the thickness, size and surface shape of the first optical lens 10 can be controlled by controlling the shape and gap of the molds on both sides. The thickness and size of the multiple first optical lenses 10 in the lens module 100 can be the same or different, and the thickness and size of the corresponding multiple positioning grooves 212 can be the same or different. It only needs to ensure that the multiple positioning grooves 212 can be coaxially arranged, which is conducive to the coaxial arrangement of the multiple first optical lenses 10. The surface shape of the first optical lens 10 is not limited, for example, it can be a spherical surface or an aspherical surface, or a flat surface. The injection molding process has fewer restrictions on materials and can be widely applied to production lines. Therefore, the injection-molded first optical lens 10 can be mass-produced to improve the production efficiency of the first optical lens 10, thereby facilitating the improvement of the production efficiency of the lens module 100.

[0039] The preparation device 200 can install multiple first optical lenses 10 into multiple positioning grooves 212 respectively, wherein the number of first optical lenses 10 in each positioning groove 212 is not limited, and the number of first optical lenses 10 in one positioning groove 212 can be 1, 2 or more. The coaxially arranged multiple positioning grooves 212 are conducive to realizing the coaxial arrangement of multiple first optical lenses 10, thereby reducing the eccentricity difference (i.e., the position deviation between the optical centers of different optical lenses) and the tilt difference (i.e., the position deviation between the central axes of different optical lenses) between the multiple first optical lenses 10. After the multiple first optical lenses 10 are installed in the multiple positioning grooves 212, a molding cavity 2131 will be formed between the main bodies 11 of adjacent first optical lenses 10, and the preparation device 200 can use the molding cavity 2131 to generate the second optical lens 20. It can be understood that the thickness of the molding cavity 2131 is determined by the distance between the main bodies 11 of two adjacent first optical lenses 10, so the thickness and surface shape of the molding cavity 2131 can be set by setting the distance between adjacent positioning grooves 212 and the surface shape of the first optical lens 10, and then the second optical lens 20 with a specific thickness and surface shape can be obtained. In addition, the preparation device 200 can also control the shape of the second optical lens 20 by controlling the shape of the first optical lens 10. For example, when the first optical lens 10 is circular, the space enclosed by the molding cavity 2131 is also circular, so that the shape of the generated second optical lens 20 is also circular.

[0040] The casting port 214 is also connected to the molding cavity 2131. The preparation device 200 can inject the casting material 300 into the molding cavity 2131 through the casting port 214. The casting material 300 and the materials on the surfaces of the two body parts 11 that it contacts together form the second optical lens 20, so that the second optical lens 20 can also connect the two adjacent first optical lenses 10 to form the lens module 100. The refractive index of the first optical lens 10 is not equal to the refractive index of the second optical lens 20.

[0041] Since the two adjacent first optical lenses 10 are coaxially arranged, the molding cavity 2131 generated by the two first optical lenses 10 is coaxially arranged with the two first optical lenses 10, so that the second optical lens 20 can also be coaxially arranged with the adjacent multiple first optical lenses 10, which is beneficial to reducing the eccentricity difference and tilt difference between the multiple optical lenses in the lens module 100, and further beneficial to improving the imaging effect of the lens module 100.

[0042] In some embodiments, the lens module 100 may also be provided with an optical film 30 to improve the imaging effect of the lens module 100. The optical film 30 is a functional film that works by utilizing the effect of the film on light. The optical film 30 can achieve functions such as spectral transmission, spectral reflection or spectral absorption, as well as light anti-reflection, light enhancement, beam splitting, high pass, low pass or narrow band filtering in terms of changing the light intensity. For example, when manufacturing the first optical lens 10, the preparation device 200 can plate a layer of optical film 30 in the first optical lens 10, so that after the second optical lens 20 is generated, the optical film 30 is located between the first optical lens 10 and the second optical lens 20, thereby utilizing the optical film 30 to improve the imaging effect of the lens module 100.

[0043] The shape of the positioning groove 212 provided on the inner surface 211 of the positioning ring 210 of the method for preparing the lens module of the disclosed embodiment matches the shape of the mounting portion 12 of the first optical lens 10, so that the first optical lens 10 can be fixedly mounted in the positioning groove 212. The relative positions between the plurality of positioning grooves 212 can be specifically designed according to the pre-designed relative position relationship of the plurality of first optical lenses 10, which is conducive to the coaxial arrangement of the plurality of first optical lenses 10 mounted in the positioning grooves 212, thereby reducing the eccentricity difference and tilt difference between the plurality of first optical lenses 10. A molding cavity 2131 is formed between the bodies of adjacent first optical lenses 10, and after the casting material 300 is injected into the molding cavity 2131 from the casting port 214, the casting material 300 in the molding cavity 2131 can form a second optical lens 20, and the second optical lens 20 and the first optical lens 10 form a lens module 100. When two adjacent first optical lenses 10 are coaxially arranged, the second optical lens 20 formed in the molding cavity 2131 between the two adjacent first optical lenses 10 can also be coaxially arranged with multiple first optical lenses 10, which is beneficial to reducing the eccentricity difference and tilt difference between the multiple optical lenses in the lens module 100, thereby improving the imaging effect of the lens module 100.

[0044] Compared with the current solution of aligning multiple optical lenses using multiple molds, the preparation device 200 disclosed in the present invention uses multiple positioning grooves 212 and a molding cavity 2131 in a positioning ring 210 to achieve alignment between multiple first optical lenses 10 and second optical lenses 20, which is conducive to ensuring that multiple first optical lenses 10 and second optical lenses 20 are coaxially arranged, and avoiding the problem of eccentricity and tilt difference between multiple optical lenses caused by misalignment of multiple molds, thereby reducing the optical alignment cost of the lens module 100. In addition, when the second optical lens 20 is generated, it will automatically connect with the two adjacent first optical lenses 10, without the need to glue the first optical lens 10 and the second optical lens 20, thereby reducing the number of gluing times and simplifying the gluing process.

[0045] In addition, in the folded optical path solution, the light is folded back and forth multiple times in the optical lens, which makes it easy for the light to have double refraction, and the double refraction phenomenon easily leads to ghosting. At present, the injection molding process is usually used to manufacture the lens module in the folded optical path solution. The double refraction phenomenon is related to the material of the optical lens and the injection molding process. The filling pressure, filling time or cooling time may cause the surface shape of the optical lens to deviate, thereby causing the problem of double refraction. Although it is currently possible to reduce the occurrence of double refraction by adding lenses or changing the surface shape of the lenses, improving the lens materials, and optimizing the optical path, thereby suppressing ghosting. However, the injection molding process actually has requirements for the thickness ratio (the ratio between the edge thickness of the optical lens and the center thickness of the optical lens) and the diameter ratio (the ratio between the edge thickness of the optical lens and the diameter of the optical lens) of the optical lens, which makes it sometimes difficult for optical lenses made using the injection molding process to effectively reduce the probability of the occurrence of double refraction problems. For example, when the thickness ratio of the optical lens is greater than 2.5 or the diameter ratio is greater than 25, the flow length ratio of the optical lens will increase, and the injection resistance will increase. If the flow length ratio is too long, the injection speed and injection pressure of the injection machine will be heavy, which may easily lead to unstable production, such as weld line phenomenon, internal stress difference or surface shape difference phenomenon, which may cause the preparation device to be unable to effectively control the surface shape and thickness of the optical lens during the production process, and further cause the light to easily undergo birefringence when entering the lens module. For optical lenses with relatively small thickness ratios and diameter ratios, the injection molding process can be used directly. For example, the thickness ratio and diameter ratio of the first optical lens 10 are generally small, so the injection molding process can be used to make the first optical lens 10. For optical lenses with relatively large thickness ratios and diameter ratios, other methods need to be used to make them.

[0046] The casting process has relatively low requirements on the thickness ratio and diameter ratio of the optical lens, so that when the preparation device 200 uses the casting process to generate the second optical lens 20, it is actually not necessary to consider whether the second optical lens 20 with the required thickness ratio and diameter ratio can be made. It only needs to adjust the thickness of the molding cavity 2131 according to the required thickness ratio and diameter ratio, and then the preparation device 200 can use the casting process to generate the second optical lens 20 with the required thickness ratio and diameter ratio. At the same time, when the preparation device 200 uses the casting process to make the second optical lens 20, the problems of weld line and injection molding fluidity can also be avoided, thereby further ensuring the imaging effect of the second optical lens 20. Therefore, the preparation device 200 of the present disclosure can stably make more second optical lenses 20 with a variety of thickness ratios and diameter ratios, so that the preparation device 200 is less restricted when making the lens module 100, and thus the lens module 100 has a certain processability. In particular, for some second optical lenses 20 that are difficult to injection mold, such as second optical lenses 20 with large thickness ratios and diameter ratios, the casting process can also stably manufacture these second optical lenses 20 and ensure that the imaging effects of these second optical lenses 20 are better, thereby reducing the probability of the occurrence of birefringence problems. Therefore, compared to the solution of using only the injection molding process to manufacture the lens module 100, the preparation device 200 disclosed in the present invention can generate lens modules 100 with more thickness ratios and diameter ratios, that is, the preparation device 200 disclosed in the present invention can effectively increase the optical design space of the lens module 100, and the imaging effects of these lens modules 100 are better optical lenses.

[0047] In some embodiments, the method for preparing the lens module further includes the following steps: Figure 3 and Figure 5 As shown:

[0048] S5: providing a collar 220 , wherein the collar 220 comprises a first thread 221 , and an inner surface 211 of the positioning ring 210 further comprises a second thread 2111 ;

[0049] S6: Install the collar 220 to the positioning ring 210 through the first thread 221 and the second thread 2111 so that the collar 220 contacts the first optical lens 10 .

[0050] Specifically, the preparation device 200 further includes a collar 220, the outer surface of the collar 220 forms a first thread 221, and the inner surface 211 of the positioning ring 210 forms a second thread 2111. The collar 220 and the positioning groove 212 form a positioning space 230, wherein the groove bottom 2121, the groove wall 2122 of the positioning groove 212 and the contact surface of the collar 220 (i.e., the surface where the collar 220 contacts the first optical lens 10) enclose the positioning space 230. When the preparation device 200 installs the first optical lens 10, the mounting portion 12 will be located in the positioning space 230, so that the preparation device 200 can use the positioning space 230 to achieve the positioning of the first optical lens 10. The collar 220 and the positioning ring 210 can be screwed together through the first thread 221 and the second thread 2111. After placing multiple first optical lenses 10 into multiple positioning grooves 212 in sequence, the preparation device 200 can install the ring 220 into the positioning ring 210 so that the ring 220 contacts the first optical lens 10 and seals the positioning groove 212. At this time, the movement of the first optical lens 10 will be restricted by the ring 220. Under the restriction of the ring 220, the first optical lens 10 cannot be detached from the positioning groove 212, thereby further enhancing the fixing effect of the first optical lens 10.

[0051] The relative positions of the multiple positioning grooves 212 can be specifically designed according to the pre-designed relative position relationship of the multiple first optical lenses 10, and the groove bottoms 2121 of the multiple positioning grooves 212 are parallel. Therefore, as long as it is ensured that each first optical lens 10 can completely interfere with the corresponding ring 220 and each ring 220 can be completely embedded in the positioning ring 210, the preparation device 200 can ensure that the bottom surface 121 of the first optical lens 10 is parallel to the groove bottom 2121 of the corresponding positioning groove 212, thereby ensuring that the axes of the multiple first optical lenses 10 are aligned.

[0052] The collar 220 and the positioning ring 210 are screwed together through the first thread 221 and the second thread 2111. If a first optical lens 10 is tilted toward the positioning groove 212, for example Figure 3In the figure, the first optical lens 10 is located on the right side. At this time, the bottom surface 121 of the mounting portion 12 of the first optical lens 10 cannot fit with the groove bottom 2121, and the side surface 122 of the mounting portion 12 cannot fit with the groove wall 2122. Part of the structure of the mounting portion 12 extends out of the positioning groove 212, resulting in the first thread 221 being unable to be completely screwed together with the second thread 2111, and part of the structure of the ring 220 extending out of the positioning ring 210. Therefore, the preparation device 200 can determine the fit between the mounting portion 12 and the positioning groove 212 according to the screwing condition of the first thread 221 and the second thread 2111, and further determine whether the mounting portion 12 of the first optical lens 10 connected to the ring 220 is inclined to the positioning groove 212. In the case where the first thread 221 and the second thread 2111 are not completely screwed together, that is, when the first optical lens 10 is inclined to the positioning groove 212 ... for example Figure 3 L in the figure is used to determine the inclination of the first optical lens 10 corresponding to the collar 220, so as to adjust the installation of the first optical lens 10 according to the inclination, so that the first optical lens 10 can completely contact the corresponding collar 220, thereby facilitating the coaxial arrangement of multiple first optical lenses 10. Figure 3 The first optical lens 10 on the right side is adjusted so that the bottom surface 121 of the first optical lens 10 on the right side is parallel to the bottom 2121 of the corresponding positioning groove 212, and the Figure 4 The effect of the two first optical lenses 10 being parallel.

[0053] Therefore, the preparation device 200 can use the ring 220 to detect whether the multiple first optical lenses 10 are tilted, which is conducive to achieving the coaxial setting of the multiple first optical lenses 10. On the other hand, the ring 220 is used to strengthen the fixing effect of the first optical lens 10 to ensure that the first optical lens 10 will not shake after the coaxial setting is achieved, causing the multiple first optical lenses 10 to tilt again, which is conducive to ensuring that the second optical lens 20 and the multiple first optical lenses 10 are coaxially set, improving the accuracy of optical alignment, and reducing the cost of optical alignment.

[0054] In some embodiments, the method for preparing the lens module further includes the following steps: Figure 4 and Figure 6 As shown:

[0055] S7: The casting port 214 is closed.

[0056] Specifically, the preparation device 200 further includes a sealing member 240, which can seal the casting port 214. After the casting material 300 fills the molding cavity 2131, the sealing member 240 can be used to seal the casting port 214. At this time, the bottom surface 241 of the sealing member 240 is flush with the inner surface 211 of the positioning ring 210 to prevent the casting material 300 from overflowing the molding cavity 2131, ensuring that the thickness of the second optical lens 20 is the same as the thickness of the molding cavity 2131, and the surface shape of the second optical lens 20 is the same as the surface shape of the molding cavity 2131, so as to ensure that the light can be refracted according to the required path when passing through the second optical lens 20, thereby ensuring the imaging effect of the lens module 100.

[0057] In some embodiments, the casting material 300 includes an amorphous thermoplastic or a light-curable plastic, such as Figure 4 Alternatively, in some other embodiments, the casting material 300 includes liquid crystal molecules 301 and amorphous thermoplastic plastic, or liquid crystal molecules 301 and photocurable plastic, such as Figure 7 shown.

[0058] Specifically, the casting material 300 needs to be a curable fluid material. During casting, the casting material 300 can be injected into the molding cavity 2131 and fill the entire molding cavity 2131, and the casting material 300 can be cured to generate the second optical lens 20 and connect the two connected first optical lenses 10. In order to ensure the casting effect, the minimum thickness of the casting material 300 is 100um. The casting material 300 includes amorphous thermoplastic plastics or photocurable plastics, such as one of polycarbonate (PC), polymethyl methacrylate (PMMA), polyacrylate (PA), alicyclic polycarbonate copolymer, thermoplastic polyurethane, polyamide, polysulfone, polyester and polyetheretherketone. After casting is completed using these casting materials 300, the second optical lens 20 is a plastic lens, such as Figure 4 The casting material 300 in the embodiment is amorphous thermoplastic or light-curing plastic. Figure 4 The second optical lens 20 is a plastic lens.

[0059] The casting material 300 may further include liquid crystal molecules 301, so that the second optical lens 20 is a liquid crystal lens, for example Figure 7Then, during casting, the casting material 300 may be liquid crystal molecules 301 and amorphous thermoplastic plastics, or the casting material 300 may be liquid crystal molecules 301 and photocurable plastics. After the amorphous thermoplastic plastics or photocurable plastics are cured, the liquid crystal molecules 301 are also fixed, and thus the preparation device 200 generates the second optical lens 20 of the liquid crystal lens type. Since the liquid crystal molecules 301 have a polarization effect, after adding the liquid crystal molecules 301, the second optical lens 20 can selectively pass polarized light with a preset polarization angle, so that the second optical lens 20 can achieve a polarization effect.

[0060] The phase distribution of the liquid crystal molecules 301 can be adjusted by electrical control, so the preparation device 200 can change the phase distribution of the liquid crystal molecules 301 along the horizontal direction by appropriate voltage control, so as to change the curvature of the second optical lens 20 by using the liquid crystal molecules 301, thereby adjusting the refractive index and focal length of the second optical lens 20, so that the second optical lens 20 can achieve different imaging effects. Therefore, lens modules 100 with different curvatures and containing multiple optical lenses can be made by using the preparation device 200. For example, the phase distribution of the liquid crystal molecules 301 can be adjusted according to the phase distribution of the aspherical surface, spherical surface or Fresnel lens, so that the curvature of the second optical lens 20 is equal to the curvature of the corresponding lens type, so that the preparation device 200 can generate the lens module 100 of the corresponding surface type. Of course, the preparation device 200 can also adjust the curvature of the molding cavity 2131 by adjusting the curvature of the first optical lens 10, thereby controlling the curvature of the second optical lens 20, thereby generating lens modules 100 with different curvatures and achieving different imaging effects.

[0061] For example, the preparation device 200 can adjust the curvature of the first optical lens 10 and the second optical lens 20 according to the curvature of the optical lens corresponding to the degree of myopia, or use the liquid crystal molecules 301 to adjust the curvature of the second optical lens 20, so as to obtain the lens module 100 of the corresponding curvature. After the lens module 100 is placed on different devices, users whose myopia corresponds to the curvature of the lens module 100 can directly use the device without having to wear an extra pair of myopia glasses. For example, when producing virtual reality (VR) head-mounted display devices, such as VR glasses, lens modules 100 with different curvatures can be used to make VR glasses that can correct the user's vision, such as VR glasses A with a myopia degree of 300 degrees corresponding to the lens module 100 and VR glasses B with a myopia degree of 0 degrees corresponding to the lens module 100. Then, when using VR glasses, users without myopia can directly wear VR glasses B, and users with myopia of 300 degrees can wear VR glasses A to clearly see the images displayed in the VR glasses, without having to wear a pair of myopia glasses on top of the VR glasses, which would increase the burden on the user and affect the user's experience. In this way, myopic users and non-myopic users can get the same experience, and myopic users no longer need to wear myopia glasses when using the corresponding equipment, thereby improving the user's experience.

[0062] The preparation device 200 may also add auxiliary materials to the casting material 300 to improve the casting effect. In one embodiment, the preparation device 200 may add acrylate to the casting material 300 to improve the viscosity of the casting material 300 by copolymerization of acrylate monomers and match the thermal expansion coefficient of the casting material 300. In another embodiment, the preparation device 200 may add nanofillers such as nanosilane, nanooxide or nanoclay to the casting material 300 to improve the mechanical properties and thermal stability of the casting material 300. In another embodiment, the preparation device 200 may add a compatibilizer to the casting material 300, such as adding a styrene-acrylate copolymer or an acrylate compatibilizer, to improve the interfacial compatibility of the casting material 300. In another embodiment, the preparation device 200 may add a photoinitiator and a photohardening compound having vinyl or the like to the casting material 300 to assist the casting material 300 in forming a mixture.

[0063] In some embodiments, the method for preparing the lens module further includes the following steps: Figure 4 and Figure 8 As shown:

[0064] S8: solidifying the casting material 300;

[0065] S9: After the casting material 300 is solidified, the collar 220 and the positioning ring 210 are removed to obtain the lens module 100 .

[0066] Specifically, after closing the casting port 214, the preparation device 200 can solidify the casting material 300, for example, by using a thermal curing or photocuring method to change the casting material 300 from a liquid state to a solid state, so as to generate the second optical lens 20, thereby generating the lens module 100. Of course, if the casting material 300 is in a liquid state, the second optical lens 20 can also be generated and connected to the first optical lens 10, and the casting material 300 may not be solidified. After the casting material 300 is solidified, the preparation device 200 can remove the collar 220 and the positioning ring 210, for example, by using a laser or a CNC machine tool to cut off the collar 220 and the positioning ring 210, so as to obtain the lens module 100, such as Fig. 9 shown.

[0067] The positioning ring 210 is sleeved on the mounting parts 12 at both ends of the first optical lens 10. The second optical lens 20 and the main body 11 of the first optical lens 10 are not blocked by the positioning ring 210 and the sleeve ring 220. Therefore, if the positioning ring 210 and the sleeve ring 220 do not affect the use of the lens module 100, after the lens module 100 is generated, the sleeve ring 220 and the positioning ring 210 can be installed together with the lens module 100 on the corresponding device without removing the sleeve ring 220 and the positioning ring 210. For example, directly Figure 7 The shown collar 220 , positioning ring 210 and lens module 100 are installed together on corresponding equipment to reduce the steps of the manufacturing process, thereby reducing the manufacturing cost of the lens module 100 .

[0068] According to the preparation device 200 provided in the embodiment of the present disclosure, Figure 3 As shown, the preparation device 200 includes a positioning ring 210, the positioning ring 210 encloses a casting space 213, the positioning ring 210 is provided with a casting port 214 connected to the casting space 213, and the inner surface 211 of the positioning ring 210 is provided with a plurality of positioning grooves 212. The preparation device 200 can implement the preparation method in the above embodiment, and for the sake of brevity, it will not be repeated here.

[0069] According to the lens module 100 provided in the embodiment of the present disclosure, Fig. 9 As shown, the lens module 100 can be prepared by the preparation method in the above embodiment, which will not be described again for the sake of brevity.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0071] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0072] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0073] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A method for preparing a lens module, characterized in that: include: Providing a positioning ring, wherein the inner surface of the positioning ring comprises at least two annular positioning grooves arranged at intervals, and the at least two positioning grooves are coaxial with the positioning ring; Providing a first optical lens, the first optical lens comprising a main body portion and a mounting portion connected to each other, wherein the positioning groove and the mounting portion match in shape; Installing a plurality of the first optical lenses to the plurality of the positioning grooves respectively, and forming a molding cavity between the body parts of adjacent first optical lenses; Casting is performed from the casting port opened in the positioning ring so that the casting material enters the molding cavity, and the casting material in the molding cavity forms a second optical lens, and the second optical lens and the first optical lens form the lens module.

2. The preparation method according to claim 1, characterized in that: Also includes: Providing a collar, the collar comprising a first thread, the inner surface of the positioning ring also forming a second thread; The collar is mounted to the positioning ring via the first thread and the second thread so that the collar contacts the first optical lens.

3. The preparation method according to claim 1, characterized in that: Also includes: The casting gate is closed.

4. The preparation method according to claim 1, characterized in that: The casting material includes amorphous thermoplastic plastic or photocurable plastic; or, the casting material includes liquid crystal molecules and amorphous thermoplastic plastic, or liquid crystal molecules and photocurable plastic.

5. The preparation method according to claim 2, characterized in that: Also includes: curing the casting material; After the casting material is solidified, the sleeve ring and the positioning ring are removed to obtain the lens module.

6. A preparation device, characterized in that: include: A positioning ring is provided, wherein the positioning ring encloses a casting space, the positioning ring is provided with a casting port connected to the casting space, and a plurality of positioning grooves are provided on the inner surface of the positioning ring.

7. The preparation device according to claim 6, characterized in that: Also includes: A collar, wherein a first thread is formed on an outer surface of the collar, and a second thread is formed on an inner surface of the positioning ring. The collar and the positioning ring can be screwed together through the first thread and the second thread, and the collar and the positioning groove form a positioning space.

8. The preparation device according to claim 6, characterized in that: The positioning groove is configured to install the first optical lens of the lens module, the first optical lens includes a connected main body portion and a mounting portion, and the shapes of the positioning groove and the mounting portion match.

9. The preparation device according to claim 8, characterized in that: The positioning groove includes a groove bottom and a groove wall that are connected, and the mounting portion includes a bottom surface and a side surface. The bottom surface of the mounting portion is in contact with the groove bottom, and the side surface of the mounting portion is in contact with the groove wall.

10. The preparation device according to claim 6, characterized in that: A sealing member is also included, and the sealing member can seal the casting port. In the sealed state, the bottom surface of the sealing member is flush with the inner surface of the positioning ring.

11. A lens module, characterized in that: The lens module is prepared by the preparation method described in any one of claims 1-5.

12. The lens module according to claim 11, characterized in that: The second optical lens is a plastic lens or a liquid crystal lens.

Images