Mold for making optical module, method for making optical module, and optical module

Abstract

The present application provides a mold for making an optical module, a method for making an optical module, and an optical module, wherein a main body is formed with a receiving cavity, a first plane and a convex surface are provided at the position corresponding to the receiving cavity, the convex surface is convex relative to the first plane, and the convex surface is arranged at the center of the first plane, a second plane and an annular surface are also provided at the position corresponding to the receiving cavity, the annular surface is arranged around the second plane and is not coplanar with the second plane, wherein the first plane and the second plane are parallel or colinearly arranged to each other, the convex surface and the annular surface include any one or a combination of inclined surfaces, spherical surfaces, aspherical surfaces, or free-form surfaces, wherein the receiving cavity is configured to be injected with molten light-transmitting material, the molten light-transmitting material adheres to the first plane and the convex surface, the second plane and the annular surface and is solidified to form an optical module, requiring thicker light-transmitting or transparent materials, reducing the loss of material cutting, and thus lowering the cost.

Description

Technical Field

[0001] The present application belongs to the field of optical manufacturing technology, and more specifically, relates to a mold for manufacturing an optical module, an optical module manufacturing method, and an optical module. Background Art

[0002] AR (Augmented Reality) is a technology that combines virtual information with the real world. The optical module is one of the core components of AR products, and is mainly responsible for the imaging of AR products. AR is different from VR. Although their optical display systems are usually composed of micro-displays and optical components, and both use a series of optical imaging components to form a distant virtual image of the pixels on the display and project it into the human eye, the difference is that AR products require see-through - both seeing the real external world and seeing virtual information.

[0003] The optical module is the core component of the near-eye display. Different preparation processes are required for different optical modules. For example, a thicker transparent substrate is usually prepared first, and then the transparent substrate is machined to obtain an optical module of a specific shape. Then, the unnecessary parts are removed by precise cutting according to the specific curve or shape. However, the above often involves thicker substrates, which are more expensive. In addition, the subsequent cutting has particularly high requirements on the position accuracy, especially millimeters, microns, etc., which takes a long time and is costly, and there is also a lot of material waste. Summary of the invention

[0004] The embodiments of the present application provide a mold for manufacturing an optical module, a method for manufacturing an optical module, and an optical module.

[0005] The mold for making an optical module in the embodiment of the present application is applied to a near-eye display device, which includes a main body, a receiving cavity is formed on the main body, a first plane and a convex surface are provided at the position corresponding to the receiving cavity, the convex surface is convex relative to the first plane, and the convex surface is arranged at the center of the first plane, and a second plane and an annular surface are also provided at the position corresponding to the receiving cavity, the annular surface is arranged around the second plane and is not coplanar with the second plane, wherein the first plane and the second plane are parallel or colinearly arranged to each other, the convex surface and the annular surface include any one or a combination of inclined surfaces, spherical surfaces, aspherical surfaces or free-form surfaces, wherein the receiving cavity is configured to be injected with molten light-transmitting material, the molten light-transmitting material adheres to the first plane and the convex surface, the second plane and the annular surface and solidifies to form the optical module.

[0006] The method for manufacturing an optical module according to the embodiment of the present application, wherein the optical module is manufactured using the mold as described above, comprises:

[0007] injecting molten light-transmitting material into the accommodating cavity;

[0008] Pressing the molten light-transmitting material to a preset thickness, so that the molten light-transmitting material is fully in contact with the first plane and the convex surface, the second plane and the annular surface;

[0009] The temperature of the molten light-transmitting material is sufficiently cooled and solidified;

[0010] The cured light-transmitting material is demolded to form an optical module, wherein the optical module includes a first flat wall, a recessed wall lower than the first flat wall, a second flat wall and an annular wall, the second flat wall is parallel to the first flat wall, the annular wall surrounds the second flat wall, and the optical module also includes a second side wall connecting the first flat wall and the annular wall.

[0011] The optical module according to the embodiment of the present application is manufactured using the above-mentioned method for manufacturing the optical module.

[0012] The mold for making an optical module, the method for making an optical module, and the optical module of the embodiments of the present application can directly inject molten material into the accommodating cavity of the mold body, so that the molten material and the corresponding design surface are fitted, and finally solidified into shape. There is no need for thicker light-transmitting or transparent materials, which reduces the loss of material cutting and thus has lower costs.

[0013] Other aspects and advantages of the embodiments of the present disclosure will be set forth in part in the following description, or may be learned from the description, or may be learned through practice of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 A structural schematic diagram of an embodiment of a mold for making an optical module provided in an embodiment of the present application;

[0016] Figure 2 A structural schematic diagram of another embodiment of a mold for making an optical module provided in an embodiment of the present application;

[0017] Figure 3 A structural schematic diagram of another embodiment of a mold for making an optical module provided in an embodiment of the present application;

[0018] Figure 4 A structural schematic diagram of another embodiment of a mold for making an optical module provided in an embodiment of the present application;

[0019] Figure 5A structural schematic diagram of another embodiment of a mold for making an optical module provided in an embodiment of the present application;

[0020] Figure 6 A structural schematic diagram of another embodiment of a mold for making an optical module provided in an embodiment of the present application;

[0021] Figure 7 A schematic structural diagram of an embodiment of injecting molten material into a mold for making an optical module provided in an embodiment of the present application;

[0022] Figure 8 A schematic structural diagram of an embodiment of the mold for making an optical module provided in an embodiment of the present application after molten material is injected and pressed together;

[0023] Fig. 9 A schematic diagram of a process of manufacturing an optical module according to an embodiment of the present application;

[0024] Fig.10 A schematic structural diagram of an optical module according to an embodiment of the present application is provided;

[0025] Fig.11 A bottom-view structural schematic diagram of an optical module according to an embodiment of the present application is provided;

[0026] Fig.12 A bottom-view structural schematic diagram of another embodiment of an optical module is provided for the embodiment of the present application;

[0027] Fig.13 A structural schematic diagram of an embodiment of an optical module application scenario is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] 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 the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] A mold for making an optical module provided in an embodiment of the present application is now described, wherein the optical module is applied to a near-eye display device, and the near-eye display device 200 can be augmented reality display glasses or existing glasses, such as myopia, hyperopia, sports glasses, goggles or smart glasses, etc. As augmented reality display glasses or smart glasses, it can also include an optical machine, which can be Micro-LED (Micro Light-Emitting Diode, micro-luminescent semiconductor), uLED (micro light-emitting diode), Micro-oled (Micro Organic Light-Emitting Diode, micro organic light-emitting diode), LCoS (Liquid Crystal On Silicon, silicon-based liquid crystal), LCD (Liquid Crystal Display, liquid crystal display), DMD (Digital Micromirror Device, digital micromirror device) / DLP (Digital LightProcessing, digital light processing) or LBS (Laser Beam Scanning, laser beam scanning), etc., or any combination of these technologies. The optical machine can provide an image source, such as text, video, information prompts, etc. The light of the optical machine passes through the optical module and can be imaged onto the human retina later.

[0033] See also Figure 1-12The mold for making the optical module includes: a body 4, which may include a combination of one or more molds, the body 4 is formed with a receiving cavity 40, the receiving cavity 40 may be an integral inner cavity, or may be a combination of a plurality of small receiving cavities arranged in an array, when there are a plurality of receiving cavities 40, they may have a uniform size, or may have different sizes, at which time they may form a regular size arrangement, for example, the size along a certain direction increases sequentially or at intervals. A first plane 22 and a convex surface 21 are provided at the position corresponding to the receiving cavity 40, the convex surface 21 is convex relative to the first plane 22, and the convex surface 21 is arranged at the center of the first plane 22, a second plane 31 and an annular surface 32 are also provided at the position corresponding to the receiving cavity 40, the annular surface 32 is arranged around the second plane 31 and is not coplanar with the second plane 31, it can be understood that the first plane 22 and the second plane 31 may be flat or substantially flat surfaces in the naked eye, of course, their surfaces may have a certain degree of roughness that is not obviously visible to the naked eye. The position of the corresponding accommodation cavity 40 mentioned above can be understood as a sealed cavity or a cavity with a gap, such as a complete cavity formed by the pressed mold, and can also be understood as a cavity with a gap formed by pressing two or three molds. For example, in one embodiment, it includes two upper and lower molds, the upper mold is roughly plate-shaped, and the lower mold is provided with an accommodation cavity. In this case, although the upper mold is not directly inside the accommodation cavity, the upper mold is a part that cooperates with each other during the pressing process of the upper and lower molds after the molten light-transmitting material is injected. At this time, the vertical projection area of ​​the accommodation cavity of the upper mold corresponding to the lower mold should also be understood as the corresponding position of the accommodation cavity 40, that is, as long as the vertical projection area of ​​the accommodation cavity 40 can cover the area of ​​the mold, it can be understood as the corresponding position of the accommodation cavity 40. It can be understood that when the molten material is not injected, the area directly facing the accommodation cavity 40 but not on the inner wall or inner side of the accommodation cavity 40 should also be understood as the corresponding position of the accommodation cavity 40.

[0034] In some embodiments, the size of the accommodating cavity 40 can be between 0.4 cubic millimeters and 4 cubic centimeters, for example, 0.4 cubic millimeters, 1 cubic millimeter, 8 cubic millimeters, 1 cubic centimeter, 2 cubic centimeters, 4 cubic centimeters, etc. The space is so small that the size of the single mirror body 50 finally formed appears relatively small to the naked eye, and it is relatively easy to integrate into various other devices, such as glasses or other head-mounted devices, etc., without affecting the appearance or large-area structure of the original device, and has a good adaptation space.

[0035] Among them, the first plane 22 and the second plane 31 are parallel or collinearly arranged with each other. For example, the first plane 22 and the second plane have different height differences on the same side, that is, they are parallel. If their height differences are the same, they are collinear. The first plane 22 and the second plane are on the same side or on different sides respectively. The first plane 22 and the convex surface 21 are a group at the first end, and the second plane 31 and the annular surface 32 are a group at the second end. The first end and the second end are parallel, or the first plane 22 and the convex surface 21, the second plane 31 and the annular surface 32 are at the same end.

[0036] In this case, they can be arranged in parallel. The convex surface 21 and the annular surface 32 include any one or a combination of an inclined surface, a spherical surface, an aspherical surface or a free-form surface, wherein the accommodating cavity 40 is configured to inject a molten light-transmitting material, and the molten light-transmitting material adheres to the first plane 22 and the convex surface 21, the second plane 31 and the annular surface 32 and solidifies to form an optical module 10. The molten light-transmitting material can be any one of polymethyl methacrylate, polycarbonate, plastic, resin or glass, and optionally, can be a transparent molten material.

[0037] The present application injects molten material between the accommodating cavities, so that the molten material and the correspondingly designed first plane 22 and convex surface 21, second plane 31 and annular surface 32 fit each other, and finally solidify into shape. There is no need for thicker light-transmitting or transparent materials in similar cutting processes, which reduces the loss of material cutting, thereby lowering the cost. In addition, it also reduces the impact of cutting on optical surfaces and other effects.

[0038] In some embodiments, the size of a single accommodating cavity 40 corresponding to the first plane 22 and the convex surface 21, the second plane 31 and the annular surface 32 may be between 1 cubic millimeter and 3 cubic centimeters, that is, the size of the formed optical module 10 appears small to the naked eye.

[0039] In some embodiments, see Figure 1-6 The accommodating cavity 40 may include a plurality of accommodating cavities arranged in a straight line or in an array, the lateral dimension of the first plane 22 corresponding to each accommodating cavity 40 is equal to the lateral dimension of the annular surface 32, and the lateral dimension of the convex surface 21 may be equal to or smaller than the lateral dimension of the second plane 31. In some embodiments, refer to Figure 1-6 The accommodating cavity 40 may include a plurality of accommodating cavities arranged in a straight line or in an array, and the lateral dimension of the first plane 22 corresponding to each accommodating cavity 40 is equal to the lateral dimension of the annular surface 32 and gradually increases along the first direction. For example, a plurality of accommodating cavities 40 arranged in a straight line or in an array, wherein the size of each accommodating cavity 40 is uniform, but the other number of accommodating cavities 40 have different sizes, such as increasing or decreasing from left to right, so that optical arrays of different sizes can be produced at one time to meet different design requirements.

[0040] In some embodiments, see Figure 1-6The body 4 includes: a first mold 20, a first plane 22 and a convex surface 21 are arranged on the first mold 20, a second mold 30 is arranged at a distance from the first mold 20 and configured to be pressed against the first mold 20, a second plane 31 and an annular surface 32 are arranged on the second mold 30, the first mold 20 and the second mold 30 are aligned, and the convex surface 21 and the second plane 31 correspond coaxially; a first side wall 33, the first side wall 33 is arranged in an annular manner on the first mold 20 and / or the second mold 30 to form an accommodating cavity 40. It can be understood that the first side wall 33 can be arranged on only one of the first mold 20 and the second mold 30, or on both molds at the same time. The first side wall 33 can be an integral body formed by the first mold 20 and the second mold 30, or can be a separate design from the first mold 20 and the second mold 30. It can be understood that the first side wall 33 is a surrounding design so that a groove can be formed to accommodate the molten light-transmitting material. Figure 1 As shown, the accommodating cavity 40 is formed as a whole, but the corresponding position thereof is still formed with the corresponding design surface. At this time, an integral optical module is formed after molding. As long as the position of each design surface is predetermined and controlled, the optical module array after demoulding can find the accurate preset position during cutting and the separation of a single optical module can also be achieved.

[0041] In some embodiments, see Figure 2-4 The mold body 4 further includes a plurality of second side walls 34, which may be a part of the first mold 20 or a part of the second mold 30, or may be independent parts set on the first mold 20 or the second mold 30, wherein the height of the second side wall 34 is the same as the height of the first side wall 33, and the second side wall 34 is set in the first mold 20 and / or the second mold 30 and is located between the first side walls 33, and the plurality of second side walls 34 are arranged at intervals to separate the accommodating cavities 40. It can be understood that the second side walls 34 can block the entry of the molten light-transmitting material, so that the solidified molten material has a gap 17 ( Fig.10 ),For example Fig.10 The optical module array shown can quickly find the segmentation position, which is beneficial to the subsequent cutting of the optical module array. In addition, the gap 17 is also beneficial for clamping or positioning by a fixture.

[0042] In some embodiments, see Figure 1-8After the first mold 20 and the second mold 30 are pressed together, there is a gap D2 between the highest end surface of the first mold 20 and the highest end surface of the second mold 30. The cross section in the direction perpendicular to the gap line is not flush with the annular surface 32, and the gap distance meets the preset value. The highest end surface here can be regarded as the mold as a whole, that is, the highest end surface formed as a whole is used as a reference. For example, when the first side wall 33 and the second side wall 34 involved in the following embodiment are located on the mold, it can be understood that the side wall and the mold are a whole, and the corresponding side wall is the highest, which is the highest end surface. The gap D2 can be about 500 microns, so that the optical module array formed subsequently is a whole, which is convenient for subsequent processing, such as batch clamping, transportation, cutting, etc. It can be understood that Figure 7 As shown, after the molten material is injected into the first mold 20 and the second mold 30, there is a gap D1 between the first mold 20 and the second mold 30. In order to ensure that the material and the design surface are fully fitted, they can be pressurized in a step, for example, the first mold 20 and the second mold 30 are further pressed together, so that there is a shorter gap D2 between the first mold 20 and the second mold 30. At this time, the excess molten material in the pressing process (pressing from D1 to D2) can overflow from the gap D1 or D2. Optionally, since the annular surface 32 is outside the second plane 31, it is not a regular vertical surface. In order to ensure that the annular surface 32 can still maintain any one or combination of the inclined surface, spherical surface, aspherical surface or free-form surface of the expected design during the pressing process, that is, to reduce the deformation of the annular surface 32 caused by the overflow process being too close to the gap, it is necessary to ensure that the gap opening is as far away from the annular surface 32 as possible, that is, to ensure that the cross section in the direction of the vertical gap line is not flush with the annular surface 32, for example, higher or lower than the position of the gap D1 or D2, which is conducive to maintaining the formation of the reference surface of the annular surface.

[0043] In some embodiments, the gap D2 may not exist, and the optical module 10 after demoulding is a single independent unit rather than a whole connected in an array, which is conducive to the personalized design in the subsequent process.

[0044] In some embodiments, see Figure 2, the second mold 30 is provided with a first side wall 33 and a plurality of second side walls 34 to form a plurality of accommodating cavities 40, the second plane 31 and the annular surface 32 are located on the inner wall of the accommodating cavity 40, and the first mold 20 is provided with a first plane 22 and a convex surface 21 in the vertical projection area corresponding to the accommodating cavity 40. It can be understood that the accommodating cavity 40 is formed only on the second mold 30, and there is a gap D2 after pressing between the end faces of the first side wall 33 and the second side wall 34 and the first plane 22 of the first mold 20, and the distance between the first plane 22 and the second plane 31 is the thickness of the optical module, so that only the height of the first side wall 33 or the second side wall 34 of one of the molds needs to be controlled, and then the pressing can be performed through another mold including the convex surface 21, and the position of the overflow gap is the farthest distance from the annular surface 32, which is conducive to the formation of the reference surface of the annular surface 32, and the first plane 22 is a flat surface, and the influence of the overflow on it can be ignored during the pressing process.

[0045] In some embodiments, see Figure 3 The first mold 20 is provided with a first side wall 33 and a plurality of second side walls 34 to form a plurality of accommodating cavities 40, the first plane 22 and the convex surface 21 are located on the inner wall of the accommodating cavity 40, and the second mold 30 is provided with a second plane 31 and an annular surface 32 in the vertical projection area corresponding to the accommodating cavity 40. Figure 2 What is different from the embodiment is that in this embodiment, the order of the first side wall 33 and the plurality of second side walls 34 is reversed, and the side walls are provided on the simpler first mold 20 which has only the first plane 22 and the convex surface 21, thereby simplifying the mold design workload.

[0046] In some embodiments, see Figure 4 The first mold 20 is provided with a first side wall 33 and a plurality of second side walls 34 to form a plurality of first accommodating cavities 41, the first plane 22 and the convex surface 21 are located on the inner wall of the first accommodating cavity 41, the second mold 30 is provided with a first side wall 33 and a plurality of second side walls 34 to form a plurality of second accommodating cavities 42, the second plane 31 and the annular surface 32 are located on the inner wall of the second accommodating cavity 42, the first accommodating cavity 41 and the second accommodating cavity 42 are arranged up and down to form the accommodating cavity 40, the first plane 22 and the convex surface 21, the second plane 31 and the annular surface 32 are located on different mold sides. Figure 2 , 3The difference from the embodiment is that the present application simultaneously sets a first side wall 33 and a plurality of second side walls 34 on the first mold 20 and the second mold 30, and the first accommodating cavity 41 and the second accommodating cavity 42 can have the same height so that the two molds can have the same height, which is beneficial to the early mold design. In addition, the height relationship of the side walls on the first mold 20 and the second mold 30 can be flexibly designed, so that the overall design flexibility is higher. In some embodiments, the first accommodating cavity 41 and the second accommodating cavity 42 can also have different heights, as long as it is ensured that the combined whole can meet the thickness requirements of the preset optical module. Compared with designing the accommodating cavity 40 only on one side, setting the accommodating cavity on both sides can appropriately share the height of the accommodating cavity designed only on one mold, which is beneficial to the injection of molten light-transmitting material.

[0047] In some embodiments, see Figure 5-6 The body 4 includes: a first mold 20; a second mold 30, which is configured to be pressed together with the first mold 20, and the second mold 30 is provided with a receiving cavity 40, wherein the receiving cavity 40 includes at least one third receiving cavity 43 and a fourth receiving cavity 44, for example, the third receiving cavity 43 and the fourth receiving cavity 44 are arranged alternately, and of course, a combination of multiple third receiving cavities 43 arranged in sequence and multiple fourth receiving cavities 44 arranged in sequence can also be used. The first plane 22 and the convex surface 21 are arranged in the third receiving cavity 43, the second plane 31 and the annular surface 32 are arranged in the fourth receiving cavity 44, and the first plane 22 and the convex surface 21, the second plane 31 and the annular surface 32 are located on one side of the same mold. It can be understood that the first plane 22 and the convex surface 21, the second plane 31 and the annular surface 32 will simultaneously form walls of corresponding shapes by injecting molten material and then pressing the mold together. At this time, in the subsequent process, such as coating, they can be operated together, reducing the operation steps of the subsequent process of the optical module, improving the production efficiency and reducing the cost.

[0048] In some embodiments, see Figure 5 , the second mold 30 is provided with a first side wall 33 and a plurality of second side walls 34 of the same height to form a third accommodating cavity 43 and a second accommodating cavity 44 arranged along the first direction, the first plane 22 and the convex surface 21 are located on the inner wall of the third accommodating cavity 43, the second plane 31 and the annular surface 32 are located on the inner wall of the fourth accommodating cavity 44, and the first mold 20 is in the shape of a flat plate, which can greatly simplify the design time and cost of the mold. The third accommodating cavity 43 and the second accommodating cavity 44 can have the same height, so as to ensure that the pressure of the injected molten material is as consistent as possible and the uniformity of the distribution of the packaged molten light-transmitting material. In other embodiments, the third accommodating cavity 43 and the second accommodating cavity 44 can also have different heights, which can be considered based on the difficulty of the molten material to fit with the corresponding design surface. For example, if the annular surface 32 requires greater pressure to fit, the corresponding fourth accommodating cavity 44 can be relatively deeper.

[0049] In some embodiments, see Figure 6 The second mold 30 is provided with a first side wall 33 and a plurality of second side walls 34 to form a third accommodating cavity 43 and a fourth accommodating cavity 44 arranged along the first direction. The first plane 22 and the convex surface 21 are located on the inner wall of the third accommodating cavity 43, and the second plane 31 and the annular surface 32 are located on the inner wall of the fourth accommodating cavity 44. The first mold 20 is provided with a first side wall 33 and a plurality of second side walls 34 to form a fifth accommodating cavity 45 arranged along the first direction. Each fifth accommodating cavity 45 is aligned with each third accommodating cavity 43 and has the same lateral size. Each fifth accommodating cavity 45 is aligned with each fourth accommodating cavity 44 and has the same lateral size. Figure 5 The difference from the embodiment is that this embodiment can further form a fifth accommodating cavity 45 on the first mold 20, so that the height of the first side wall 33 and the second side wall 34 of the second mold 30 can be reduced, and the weight of the second mold 30 can be reduced. In addition, the position of the overflow port can be controlled in the middle position to facilitate the fitting of the molten material and their respective corresponding surfaces.

[0050] In some embodiments, the distance of the gap D2 may be between 100-500 microns. It is understandable that if it is too thin, it will be difficult to ensure the overall structural strength of the optical module array, and if it is too thick, it will be difficult to perform mechanical cutting for subsequent separation of the optical module array.

[0051] The present application also provides an embodiment of a method for manufacturing an optical module. The optical module is applied to a near-eye display device. The method for manufacturing the optical module is made by using the mold of the above embodiment. Fig. 9 , the manufacturing method of the optical module includes:

[0052] Inject molten light-transmitting material into the accommodating cavity 40; the molten light-transmitting material can refer to the above embodiment, which will not be described again. The molten material can be injected into the top, side, bottom, etc. of the accommodating cavity 40, as long as it can be injected conveniently.

[0053] The molten light-transmitting material is pressed to a preset thickness so that the molten light-transmitting material is fully in contact with the first plane 22 and the raised surface 21, the second plane 31 and the annular surface 32; a pressure mechanism can be used to press the wall of the accommodating cavity 40. For example, when the accommodating cavity includes an upper and lower mold, the upper and lower molds can be pressed close to each other.

[0054] The temperature of the molten light-transmitting material is sufficiently cooled to solidify to form an optical module 10. For example, the temperature of the molten light-transmitting material can be cooled to below the solidification point of the corresponding material so that it is fully solidified, wherein the optical module includes a first flat wall 12, a recessed wall 11 lower than the first flat wall 12, the optical module 10 also includes a second flat wall 13 and an annular wall 14, the second flat wall 13 is parallel to the first flat wall 12, the annular wall 14 surrounds the second flat wall 13, and the optical module 10 also includes a side wall 15 connecting the first flat wall 12 and the annular wall 14; wherein the shapes of the recessed wall 11 and the convex surface 21 are complementary to each other, and the shapes of the annular wall 14 and the annular surface 32 are complementary to each other, that is, if one of them is a convex surface, the other is a recessed surface.

[0055] The cured optical module 10 is demoulded; for example, a clamp or the like can be used to clamp the corresponding mold and demould it.

[0056] In some embodiments, after demolding the solidified molten light-transmitting material to form the optical module 10, the optical module 10 is further coated with a film on the recessed wall 11 and the annular wall 14. Physical vapor deposition or chemical vapor deposition, such as mask coating, sputtering coating or ion plating, can be used to provide a metal or metal alloy reflective layer on the recessed wall 11 and the annular wall 14, such as silver, aluminum, aluminum-magnesium alloy, etc. In some embodiments, a corresponding baffle can be provided, the shielding area of ​​the baffle shields the first flat wall (12) and the second flat wall (13), and the hollow area of ​​the baffle corresponds to the recessed wall 11 and the annular wall 14.

[0057] The present application also provides an optical module embodiment, in conjunction with Fig.13 The optical module is applied to the near-eye display device 200, which may include a frame 201 and a lens, and the optical module may be arranged on the frame 201 or the lens. The optical module 10 is manufactured by the manufacturing method of the above embodiment.

[0058] In some embodiments, in conjunction with Figure 7-8 10-12, the optical module 10 includes a plurality of arrays 100, and there is a gap 17 and a connecting layer 16 between two adjacent optical modules 10. The connecting layer 16 is arranged along the entire circumference of each optical module 10 so that the entire array can be more stable. In some embodiments, the connecting layer 16 is arranged at intervals along the circumference of each optical module 10, so that the injected light-transmitting material can be reduced and the cost can be reduced. It can be understood that the connecting layer 11 is formed by the gap D2 of the above embodiment, and the thickness of the connecting layer 11 can be 100-500 microns. In this way, the structural strength of the entire optical module array is ensured, and it is not difficult to perform mechanical cutting later.

[0059] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A mold for making an optical module, wherein the optical module is applied to a near-eye display device, characterized in that: include: A body (4), wherein the body (4) is formed with a receiving cavity (40); A first plane (22) and a convex surface (21) are provided corresponding to the position of the accommodating cavity (40), the convex surface (21) is convex relative to the first plane (22), and the convex surface (21) is arranged at the center of the first plane (22); A second plane (31) and an annular surface (32) are also provided at the position corresponding to the accommodating cavity (40); the annular surface (32) is arranged around the second plane (31) and is not coplanar with the second plane (31); wherein the first plane (22) and the second plane (31) are parallel to or colinear with each other; the convex surface (21) and the annular surface (32) include any one or a combination of inclined surfaces, spherical surfaces, aspherical surfaces or free-form surfaces; wherein the accommodating cavity (40) is configured to be injected with molten light-transmitting material; the molten light-transmitting material adheres to the first plane (22) and the convex surface (21), the second plane (31) and the annular surface (32) and is solidified to form an optical module (10).

2. The mold for making an optical module according to claim 1, characterized in that: The accommodating cavities (40) include a plurality of accommodating cavities arranged in a straight line or in an array, and the lateral dimension of the first plane (22) corresponding to each accommodating cavity (40) is equal to the lateral dimension of the annular surface (32).

3. The mold for making an optical module according to claim 1, wherein: The accommodating cavities (40) include a plurality of accommodating cavities arranged in a straight line or in an array, and along a first direction, the lateral dimensions of the first plane (22) and the lateral dimensions of the annular surface (32) corresponding to the accommodating cavities (40) gradually increase.

4. The mold for making an optical module according to claim 1, wherein: The body (4) comprises: A first mold (20), wherein the first plane (22) and the convex surface (21) are arranged on the first mold (20), a second mold (30) arranged at a distance from the first mold (20) and configured to be pressed together with the first mold (20); the second plane (31) and the annular surface (32) are arranged on the second mold (30); the first mold (20) and the second mold (30) are aligned; and the convex surface (21) and the second plane (31) are coaxially corresponding; A first side wall (33), wherein the first side wall (33) is disposed around the first mold (20) and / or the second mold (30) to form the accommodating cavity (40).

5. The mold for making an optical module according to claim 4, characterized in that: It also includes a plurality of second side walls (34), wherein the height of the second side walls (34) is the same as the height of the first side walls (33), the second side walls (34) are arranged on the first mold (20) and / or the second mold (30) and are located between the first side walls (33), and the plurality of second side walls (34) are arranged at intervals to separate the accommodating cavities (40).

6. The mold for manufacturing an optical module according to claim 1, characterized in that: After the first mold (20) and the second mold (30) are pressed together, a gap (D2) is provided between the first molds (20), a cross section perpendicular to the gap line is not flush with the annular surface (32), and the gap distance meets a preset value.

7. The mold for manufacturing an optical module according to claim 5, characterized in that: The second mold (30) is provided with the first side wall (33) and a plurality of second side walls (34) to form a plurality of the accommodating cavities (40); the second plane (31) and the annular surface (32) are located on the inner wall of the accommodating cavity (40); and the first mold (20) is provided with the first plane (22) and the convex surface (21) in a vertical projection area corresponding to the accommodating cavity (40).

8. The mold for manufacturing an optical module according to claim 5, characterized in that: The first mold (20) is provided with the first side wall (33) and a plurality of second side walls (34) to form a plurality of accommodating cavities (40); the first plane (22) and the convex surface (21) are located on the inner wall of the accommodating cavity (40); and the second mold (30) is provided with the second plane (31) and an annular surface (32) in a vertical projection area corresponding to the accommodating cavity (40).

9. The mold for manufacturing an optical module according to claim 5, characterized in that: The first mold (20) is provided with the first side wall (33) and a plurality of second side walls (34) to form a plurality of first accommodating cavities (41); the first plane (22) and the convex surface (21) are located on the inner wall of the first accommodating cavity (41); the second mold (30) is provided with the first side wall (33) and a plurality of second side walls (34) to form a plurality of second accommodating cavities (42); the second plane (31) and the annular surface (32) are located on the inner wall of the second accommodating cavity (42); the first accommodating cavity (41) and the second accommodating cavity (42) are arranged up and down to form the accommodating cavity (40); the first plane (22) and the convex surface (21), the second plane (31) and the annular surface (32) are located on different mold sides.

10. The mold for manufacturing an optical module according to claim 1, characterized in that: The body (4) comprises: A first mold (20); The second mold (30) is configured to be pressed together with the first mold (20), and the second mold (30) is provided with the accommodating cavity (40), wherein the accommodating cavity (40) includes at least a third accommodating cavity (43) and a fourth accommodating cavity (44), the first plane (22) and the convex surface (21) are arranged in the third accommodating cavity (43), the second plane (31) and the annular surface (32) are arranged in the fourth accommodating cavity (44), and the first plane (22) and the convex surface (21), the second plane (31) and the annular surface (32) are located on one side of the same mold.

11. The mold for manufacturing an optical module according to claim 10, characterized in that: The second mold (30) is provided with a first side wall (33) and a plurality of second side walls (34) of the same height to form a third accommodating cavity (43) and a second accommodating cavity (44) arranged along a first direction; the first plane (22) and the convex surface (21) are located on the inner wall of the third accommodating cavity (43); the second plane (31) and the annular surface (32) are located on the inner wall of the fourth accommodating cavity (44); and the first mold (20) is in the shape of a flat plate.

12. The mold for manufacturing an optical module according to claim 10, characterized in that: The second mold (30) is provided with a first side wall (33) and a plurality of second side walls (34) to form a third accommodating cavity (43) and a fourth accommodating cavity (44) arranged along a first direction, the first plane (22) and the convex surface (21) are located on the inner wall of the third accommodating cavity (43), the second plane (31) and the annular surface (32) are located on the inner wall of the fourth accommodating cavity (44), the first mold (20) is provided with a first side wall (33) and a plurality of second side walls (34) to form a fifth accommodating cavity (45) arranged along the first direction, each of the fifth accommodating cavities (45) is aligned with each of the third accommodating cavities (43) and has the same lateral size, and each of the fifth accommodating cavities (45) is aligned with each of the fourth accommodating cavities (44) and has the same lateral size.

13. A method for manufacturing an optical module, wherein the optical module is applied to a near-eye display device, characterized in that: The optical module is manufactured by using the mold according to any one of claims 1 to 13, and the ... injecting molten light-transmitting material into the accommodating cavity (40); Pressing the molten light-transmitting material to a preset thickness, so that the molten light-transmitting material is fully in contact with the first plane (22) and the convex surface (21), the second plane (31) and the annular surface (32); Cooling the molten light-transmitting material sufficiently to solidify it; The cured light-transmitting material is demoulded to form the optical module (10), wherein the optical module comprises a first flat wall (12), a recessed wall (11) lower than the first flat wall (12), the optical module (10) further comprises a second flat wall (13) and an annular wall (14), the second flat wall (13) is parallel to the first flat wall (12), the annular wall (14) surrounds the second flat wall (13), and the optical module (10) further comprises a second side wall (15) connecting the first flat wall (12) and the annular wall (14).

14. The method for manufacturing an optical module according to claim 13, wherein: After demoulding the solidified molten light-transmitting material to form the optical module (10), the method further comprises: coating the recessed wall (11) and the annular wall (14) of the optical module (10) with a reflective film.

15. An optical module, applied to a near-eye display device, characterized in that: The optical module is manufactured using the manufacturing method described in any one of claims 13-14.

16. The optical module according to claim 15, wherein: The optical modules (10) include a plurality of optical modules (10), and a gap (17) and a connecting layer (16) are provided between two adjacent optical modules (10). The connecting layer (16) is arranged along the entire circumference of each optical module (10), or the connecting layer (16) is arranged at intervals along the circumference of each optical module (10).

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