Preparation method of optical waveguide lens

Abstract

The invention relates to the technical field of optical waveguide lens manufacturing, in particular to a preparation method of an optical waveguide lens. When the optical waveguide lens is manufactured, the first opening is filled with the second optical cement into the glue injection space, and air is exhausted from the inside of the glue injection space to the outside by means of the second opening, so that the glue injection space is filled with the second optical cement, and the light transmittance of the finally manufactured optical waveguide lens can be improved. As the air in the glue injection space is pumped out when the second optical glue is filled, the air in the glue injection space can be effectively pumped out, the generation of bubbles in the process of filling the second optical glue is reduced, and the light transmittance of the optical waveguide lens is improved. In addition, the pressure in the glue injection space can be reduced through air exhaust, negative pressure is formed, the second optical cement can better flow into all corners of the cavity, the uniformity and integrity of the second optical cement are improved, and the display impression of the optical waveguide lens is further improved.

Description

Technical Field

[0001] This application relates to the technical field of manufacturing optical waveguide lenses, and particularly to a method for preparing an optical waveguide lens. Background Art

[0002] The development of augmented reality technology has driven the demand for new display devices. Due to advantages such as being thin, having a wide viewing angle, and low power consumption, optical waveguide technology is widely used in augmented reality glasses and head-mounted display devices.

[0003] Currently, it is difficult to perform roll lamination on the display area of an optical waveguide sheet, resulting in a pain point in solving the problem of light loss in the display area of the optical waveguide sheet, which affects the display perception of the optical waveguide lens. Summary of the Invention

[0004] Based on this, this application provides a method for preparing an optical waveguide lens to improve the display perception of the optical waveguide lens.

[0005] An embodiment of this application provides a method for preparing an optical waveguide lens, including:

[0006] Providing a first laminating member and a second laminating member, the first laminating member including a middle portion and an edge portion surrounding the middle portion;

[0007] Setting a first optical adhesive on the edge portion, laminating the first laminating member, the second laminating member, and the first optical adhesive to form an initial laminate; the first laminating member, the second laminating member, and the first optical adhesive jointly enclose an injection space, and the initial laminate has a first opening and a second opening, both the first opening and the second opening communicate the injection space with the outside;

[0008] Performing a curing treatment on the first optical adhesive of the initial laminate to make the initial laminate form a laminate;

[0009] Injecting a second optical adhesive into the injection space of the laminate through the first opening, and extracting the gas in the injection space of the laminate to the outside through the second opening, so that the second optical adhesive fills the injection space of the laminate and forms an optical waveguide lens to be cured;

[0010] Performing a curing treatment on the first optical adhesive and the second optical adhesive of the optical waveguide lens to be cured to form an optical waveguide lens.

[0011] In one embodiment, both the first optical adhesive and the second optical adhesive are photo-curable adhesives; injecting the second optical adhesive into the injection space of the laminate through the first opening, and extracting the gas in the injection space of the laminate to the outside through the second opening, so that the second optical adhesive fills the injection space of the laminate and forms an optical waveguide lens to be cured, including:

[0012] Heat-treat the cured laminate to raise the temperature of the second optical adhesive to the target temperature and keep the target temperature constant.

[0013] In one embodiment, the second optical adhesive is injected into the injection space of the laminate through the first opening, and the gas in the injection space of the laminate is pumped out to the outside through the second opening, so that the second optical adhesive fills the injection space of the laminate and forms a light waveguide lens to be cured. It further includes:

[0014] Obtain the position information of the injection liquid level in the injection space of the laminate;

[0015] Determine and control the injection rate of the second optical adhesive according to the position information of the injection liquid level.

[0016] In one embodiment, before injecting the second optical adhesive into the injection space of the laminate through the first opening and pumping out the gas in the injection space of the laminate to the outside through the second opening, so that the second optical adhesive fills the injection space of the laminate and forms a light waveguide lens to be cured, it includes:

[0017] Place the laminate in the target pose; when the laminate is in the target pose, the direction in which the first fitting member points to the second fitting member is parallel to the direction of gravity;

[0018] Determining and controlling the injection rate of the second optical adhesive according to the position information of the injection liquid level includes:

[0019] When the ratio of the height of the injection liquid level to the target size is less than or equal to 0.3, determine and control the injection rate of the second optical adhesive to be the first target rate;

[0020] When the ratio of the height of the injection liquid level to the target size is greater than 0.3 and less than 0.9, determine and control the injection rate of the second optical adhesive to be the second target rate;

[0021] When the ratio of the height of the injection liquid level to the target size is greater than or equal to 0.9, determine and control the injection rate of the second optical adhesive to be the third target rate;

[0022] Wherein, the first target rate is greater than the second target rate, and the second target rate is greater than the third target rate; the height of the injection liquid level is the distance between the injection liquid level and the bottom surface of the injection space along the direction of gravity, and the target size is the distance between the two side surfaces of the inner wall of the injection space along the direction of gravity.

[0023] In one embodiment, the first target rate is 8 ml / min to 10 ml / min; and / or

[0024] The second target rate is 4 ml / min to 6 ml / min; and / or

[0025] The third target rate is from 1 ml / min to 3 ml / min.

[0026] In one embodiment, a first optical adhesive is disposed on the edge portion, and the first fitting member, the second fitting member, and the first optical adhesive are pressed together to form an initial pressed body, which includes:

[0027] A glue masking layer is disposed on the edge portion;

[0028] Disposing the first optical adhesive on the edge portion and pressing the first fitting member, the second fitting member, and the first optical adhesive together to form a pressed body, which includes:

[0029] Disposing the first optical adhesive on the glue masking layer.

[0030] In one embodiment, disposing a glue masking layer on the edge portion includes:

[0031] The glue masking layer is formed by an electrohydrodynamic printing process using a first preset ink; wherein, the viscosity of the first preset ink is greater than 5 centipoise and less than 500 centipoise, and the thickness of the glue masking layer is less than 10 microns.

[0032] In one embodiment, the first optical adhesive includes a base adhesive and microparticles filled in the base adhesive; and / or

[0033] The viscosity of the first optical adhesive is greater than 5000 centipoise and less than 200000 centipoise; and / or

[0034] The viscosity of the second optical adhesive is greater than 10 centipoise and less than 3000 centipoise.

[0035] In one embodiment, after curing the first optical adhesive and the second optical adhesive of the waveguide lens to be cured to form a waveguide lens, it further includes:

[0036] A light shielding layer is disposed on the circumferential side surface of the waveguide lens.

[0037] In one embodiment, disposing a light shielding layer on the circumferential side surface of the waveguide lens includes:

[0038] The light shielding layer is formed by an electrohydrodynamic printing process using a second preset ink;

[0039] wherein, the viscosity of the second preset ink is greater than 5 centipoise and less than 500 centipoise, and the thickness of the light shielding layer is less than 10 microns.

[0040] In the method for preparing the above optical waveguide lens, when manufacturing the optical waveguide lens, the second optical adhesive is filled into the injection space through the first opening, and air is evacuated from the injection space through the second opening, so that the second optical adhesive fills the injection space. This can improve the light transmittance of the finally manufactured optical waveguide lens. This is because, when filling the second optical adhesive in this application, the gas in the injection space is evacuated to the outside, which can effectively evacuate the air in the injection space, reduce the generation of bubbles during the filling of the second optical adhesive, and improve the light transmittance of the optical waveguide lens. In addition, evacuating air can also reduce the pressure in the injection space to form a negative pressure, which helps the second optical adhesive flow better into all corners of the cavity, improving the uniformity and integrity of the second optical adhesive, and further enhancing the display perception of the optical waveguide lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 FIG. is a flowchart of an embodiment of the method for preparing an optical waveguide lens provided by the present application.

[0042] Figure 2 FIG. is a schematic flow diagram of step S410 in some embodiments of the present application.

[0043] Figure 3 FIG. is a schematic flow diagram of step S420 and step S430 in some embodiments of the present application.

[0044] Figure 4 FIG. is a schematic flow diagram of step Se in some embodiments of the present application.

[0045] Figure 5 FIG. is a schematic flow diagram of step S431 in some embodiments of the present application.

[0046] Figure 6 FIG. is a schematic flow diagram of step SA in some embodiments of the present application.

[0047] Figure 7 FIG. is a schematic flow diagram of step S210 in some embodiments of the present application.

[0048] Figure 8 FIG. is a schematic flow diagram of step Sa in some embodiments of the present application.

[0049] Figure 9 FIG. is a schematic flow diagram of step S600 in some embodiments of the present application.

[0050] Figure 10 FIG. is a schematic flow diagram of step S610 in some embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0052] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship in the accompanying drawings. These 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. Therefore, it should not be construed as a limitation to the present application.

[0053] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0054] In the present application, unless otherwise clearly specified and limited, if terms such as "install", "connect", "join", "fix", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0055] In this application, unless otherwise clearly defined and limited, when a first feature is described as being "on" or "under" a second feature or the like, it 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, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0057] This application provides a method for preparing an optical waveguide lens, which can be referred to Figure 1 , Figure 1 is a flowchart of an embodiment of the method for preparing an optical waveguide lens provided by this application. The method for preparing an optical waveguide lens includes the following steps:

[0058] Step S100: Provide a first fitting and a second fitting. The first fitting includes a middle part and an edge part surrounding the middle part;

[0059] Step S200: Dispose a first optical glue on the edge part, and press the first fitting, the second fitting and the first optical glue to form an initial pressed body; the first fitting, the second fitting and the first optical glue jointly enclose a glue injection space. The initial pressed body has a first opening and a second opening, and both the first opening and the second opening communicate with the glue injection space and the outside;

[0060] Step S300: Cure the first optical glue of the initial pressed body to make the initial pressed body form a pressed body;

[0061] Step S400: Inject a second optical glue into the glue injection space of the pressed body through the first opening, and extract the gas in the glue injection space of the pressed body to the outside through the second opening, so that the second optical glue fills the glue injection space of the pressed body and forms an optical waveguide lens to be cured;

[0062] Step S500: Cure the first optical glue and the second optical glue of the optical waveguide lens to be cured to form an optical waveguide lens.

[0063] In step S100, a first fitting member and a second fitting member are provided. The first fitting member includes a middle portion and an edge portion surrounding the middle portion.

[0064] Specifically, the middle portion of the first fitting member can be a grating or a waveguide, and the edge portion surrounding the middle portion is the part to be sealed. The second fitting member is a flat or complementary structure substrate. In addition, a third fitting member, a fourth fitting member, etc. can be added. The number of fitting members is not limited and is set according to the requirements of the optical waveguide lens.

[0065] In step S200, a first optical adhesive is disposed on the edge portion, and the first fitting member, the second fitting member, and the first optical adhesive are pressed together to form an initial pressed body. The first fitting member, the second fitting member, and the first optical adhesive jointly enclose a glue injection space. The initial pressed body has a first opening and a second opening, and both the first opening and the second opening communicate with the glue injection space and the outside.

[0066] Specifically, the gas generated during the pressing process can be discharged to the outside through the first opening or the second opening, so that the first fitting member and the second fitting member can be closely attached together.

[0067] Before performing this step, that is, before pressing the first fitting member, the second fitting member, and the first optical adhesive, a dispensing step is required. In some embodiments, the first optical adhesive needs to be coated on the surface of the first fitting member located below. For example, when the placement order is the first fitting member, the optical adhesive, and the second fitting member, the first fitting member is located below the second fitting member, and the first optical adhesive is coated on the surface of the first fitting member. The embodiments of the present application do not limit this. It should be noted that the execution subject of this dispensing action can be the same as the execution subject of the pressing or different execution subjects. The embodiments of the present application do not specifically limit this.

[0068] In step S300, the first optical adhesive of the initial pressed body is cured to make the initial pressed body form a pressed body.

[0069] Among them, the curing treatment is carried out by ultraviolet light. The first optical adhesive can be an acrylate-based optical adhesive, an epoxy resin-based optical adhesive, etc. The curing rate is faster by using ultraviolet light, which improves the production efficiency.

[0070] In step S400, a second optical adhesive is injected into the glue injection space of the pressed body through the first opening, and the gas in the glue injection space of the pressed body is pumped out through the second opening, so that the second optical adhesive fills the glue injection space of the pressed body and forms an optical waveguide lens to be cured.

[0071] According to the principle of fluid mechanics, gas always flows from a high-pressure area to a low-pressure area. When the gas in the glue injection space is pumped out, the gas pressure in the glue injection space decreases, forming a negative pressure. Under a negative pressure environment, the second optical glue is affected by the external atmospheric pressure and is more likely to fill into every corner of the glue injection space, improving the uniformity and filling efficiency of glue injection.

[0072] Specifically, the first opening and the second opening can be respectively arranged on opposite sides of the glue injection space. In this way, the second optical glue is injected from one side, and the gas is pumped out from the other side, forming a natural flow path, which is beneficial to the uniform filling of the second optical glue, reduces the retention of gas in the glue injection space, and improves the air extraction efficiency. And the negative pressure helps to pump out the bubbles generated during the glue injection process from the material, reducing the bubbles remaining in the glue injection space and improving the quality of the manufactured optical waveguide lens.

[0073] In step S500, the first optical glue and the second optical glue of the optical waveguide lens to be cured are cured to form an optical waveguide lens.

[0074] Specifically, ultraviolet light can be used to cure the second optical glue and the first optical glue that has undergone primary curing treatment.

[0075] The curing treatment in step S300 can completely cure the first optical glue or may not be completely cured. The curing treatment in step S500 can thoroughly cure the first optical glue and the second optical glue, prevent the remaining uncured part, reduce the deformation caused by the shrinkage of the first optical glue and the second optical glue, improve the interfacial bonding strength between the first optical glue and the second optical glue and the first fitting and the second fitting, and improve the quality of the optical waveguide lens. Reduce the refractive index non-uniformity or scattering caused by uncured glue, making the refractive index difference of the optical waveguide lens precisely controllable.

[0076] The method provided by the embodiments of the present application forms an initial laminate by disposing a first optical adhesive on the edge portion and pressing the first laminate, the second laminate and the first optical adhesive together, and then curing the initial laminate to form a laminate with an injection space. Then, a second optical adhesive is injected into the injection space through a first opening, and the gas in the injection space is pumped out through a second opening. The pumping out of the gas reduces impurities and bubbles in the injection space, reducing the risk of bonding defects between the first laminate and the second laminate. If air is filled in the cavity, multiple reflections of light waves at the air interface generate stray light. In the present application, the second optical adhesive is used to replace air and fill the injection space, reducing multiple reflections and scattering of light waves in the air layer, and improving the display perception of the waveguide lens. Moreover, when filling the second optical adhesive, pumping out the gas in the injection space can effectively pump out the air in the cavity, reducing the generation of bubbles during the filling process of the second optical adhesive and improving the light transmittance of the waveguide lens. In addition, pumping air can also reduce the pressure in the injection space, forming a negative pressure, which helps the second optical adhesive flow better into all corners of the injection space, improving the uniformity and integrity of the second optical adhesive, and further improving the display perception of the waveguide lens.

[0077] In some embodiments, referring to Figure 2 , Figure 2 is a schematic flow chart of step S410 in some embodiments of the present application. Step S400 includes the following steps:

[0078] Step S410: Heat the cured laminate to raise the temperature of the second optical adhesive to a first target temperature and keep the first target temperature unchanged.

[0079] In this way, since both the first optical adhesive and the second optical adhesive are photo-curable adhesives, the increase in temperature can make the second optical adhesive more evenly distributed throughout the injection space, and heating increases the fluidity of the second optical adhesive, helping bubbles and impurities to be discharged from the second opening, reducing bonding defects, and improving the uniformity and consistency of bonding.

[0080] It should be noted that the first target temperature is 40°C to 50°C. The specific value of the first target temperature can be selected and set according to the actually used first optical adhesive and second optical adhesive, different laminates, and curing requirements. The embodiments of the present application do not make specific limitations on this.

[0081] In some embodiments, referring to Figure 3 , Figure 3 is a schematic flow chart of step S420 and step S430 in some embodiments of the present application; step S400 further includes the following steps:

[0082] Step S420: Obtain the position information of the glue injection liquid level in the glue injection space of the press-fitting body;

[0083] Step S430: Determine and control the injection rate of the second optical glue according to the position information of the glue injection liquid level.

[0084] In step S420, obtaining the position information of the glue injection liquid level in real time can monitor the progress of the glue injection process, change the glue injection strategy, and enable the second optical glue to fill the glue injection space as expected.

[0085] In step S430, by adjusting the injection rate of the second optical glue in real time, the second optical glue can be evenly distributed in the glue injection space, preventing the phenomenon of local over-thickness or over-thinness of the optical waveguide lens, and reducing the formation of bubbles and defects. An overly fast glue injection rate may cause gas to be trapped in the second optical glue, forming bubbles. An appropriate glue injection rate can allow the gas to have enough time to escape, improving the quality of the optical waveguide lens.

[0086] In some embodiments, referring to Figure 4 and Figure 5 , Figure 4 is a schematic flowchart of step Se in some embodiments of the present application, Figure 5 is a schematic flowchart of step S431 in some embodiments of the present application.

[0087] Before step S400, the following steps are further included:

[0088] Step Se: Place the press-fitting body in a target pose; when the press-fitting body is in the target pose, the direction in which the first fitting member points to the second fitting member is parallel to the gravity direction.

[0089] Step S430 further includes the following steps:

[0090] Step S431: When the ratio of the height of the glue injection liquid level to the target size is less than or equal to 0.3, determine and control the injection rate of the second optical glue as the first target rate;

[0091] When the ratio of the height of the glue injection liquid level to the target size is greater than 0.3 and less than 0.9, determine and control the injection rate of the second optical glue as the second target rate;

[0092] When the ratio of the height of the glue injection liquid level to the target size is greater than or equal to 0.9, determine and control the injection rate of the second optical glue as the third target rate;

[0093] Among them, the first target rate is greater than the second target rate, and the second target rate is greater than the third target rate; the height of the glue injection liquid level is the distance from the glue injection liquid level to the bottom surface of the glue injection space in the gravity direction, and the target size is the distance between the two side surfaces of the inner wall of the glue injection space in the gravity direction.

[0094] In step Se, placing the normal direction of the laminate parallel to the direction of gravity can make the contact between the first fitting and the second fitting more stable and flat. This placement helps to reduce the deviation caused by gravity and improve the display perception of the optical waveguide lens.

[0095] In step S431, when the ratio of the height of the glue injection liquid level to the target size is less than or equal to 0.3, that is, when initially injecting the second optical glue into the glue injection space, the first target rate can be adopted to quickly inject glue into the glue injection space. Injecting glue quickly in the initial stage can shorten the total process time. High-speed glue injection flushes the front of the second optical glue through kinetic energy, destroys the bubble nuclei formed by surface tension in the initial stage, and inhibits the retention of bubbles at the front end of the glue injection space.

[0096] When the ratio of the height of the glue injection liquid level to the target size is greater than 0.3 and less than 0.9, the injection rate of the second optical glue is adjusted to the second target rate to further reduce the residual rate of bubbles in the glue injection space.

[0097] When the ratio of the height of the glue injection liquid level to the target size is greater than or equal to 0.9, slow injection with a smaller third target rate can reduce the risk of overflow of the second optical glue and reduce subsequent cleaning work.

[0098] Specifically, a glue injection device controlled by air pressure can be adopted. The air control system has high stability during operation, can effectively prevent glue injection quality problems caused by air pressure fluctuations. And the air control device has a fast response speed to air pressure changes and can quickly adjust the air pressure to meet different glue injection requirements.

[0099] In some embodiments, the first target rate is 8 ml / min to 10 ml / min; and / or, the second target rate is 4 ml / min to 6 ml / min; and / or, the third target rate is 1 ml / min to 3 ml / min.

[0100] The applicant found that when the ratio of the height of the glue injection liquid level to the target size is less than or equal to 0.3, the first target rate is selected as 8 ml / min to 10 ml / min. In this way, both rapid glue injection is achieved and the glue will not get out of control or overflow due to being too fast, achieving a balance between speed and control.

[0101] When the ratio of the height of the glue injection liquid level to the target size is greater than 0.3 and less than 0.9, the second target rate is selected as 4 ml / min to 6 ml / min. As the height of the glue injection liquid level increases, the risk of overflow also gradually increases. When the rate is between 4 ml / min and 6 ml / min, the flow of the glue can be effectively controlled, reducing the possibility of overflow of the second optical glue.

[0102] When the ratio of the height of the glue injection liquid surface to the target size is greater than or equal to 0.9, the glue injection rate of the second optical glue is 1 ml / min to 3 ml / min. When the size ratio is close to 1, the glue injection space is relatively small. Reducing the glue injection rate can prevent too much or too little glue, enabling the second optical glue to be filled more evenly.

[0103] In some embodiments, referring to Figure 6 and Figure 7 , Figure 6 is a schematic flow chart of step SA in some embodiments of the present application, Figure 7 is a schematic flow chart of step S210 in some embodiments of the present application. Before step S200, the following steps are further included:

[0104] Step SA: Set a glue masking layer at the edge part.

[0105] Step S200 further includes the following steps:

[0106] Step S210: Set the first optical glue on the glue masking layer.

[0107] In step SA, before setting the first optical glue on the first fitting member, a glue masking layer is set. Specifically, the so-called glue masking layer is essentially a coating that covers the first optical glue subsequently. By setting the glue masking layer, the first optical glue applied later can be hidden, making the appearance of the manufactured optical waveguide lens neater and more beautiful.

[0108] In step S210, the first optical glue is set on the glue masking layer, and the first optical glue is evenly distributed in the area where the glue masking layer is set, so that the cured first optical glue can be located on the glue masking layer. When in use, the first optical glue is blocked by the glue masking layer, improving the aesthetics.

[0109] In this way, setting the glue masking layer at the edge part effectively covers the first optical glue applied later, making the appearance of the optical waveguide lens neater and more beautiful. When the user observes, only the uniform and smooth glue masking layer can be seen, and the glue cannot be directly seen, thus greatly improving the visual satisfaction of the optical waveguide lens.

[0110] In some embodiments, referring to Figure 8 , Figure 8 is a schematic flow chart of step Sa in some embodiments of the present application. Step SA includes the following steps:

[0111] Step Sa: The glue masking layer is formed by electrohydrodynamic printing technology and using a first preset ink; wherein, the viscosity of the first preset ink is greater than 5 centipoise and less than 500 centipoise, and the thickness of the glue masking layer is less than 10 micrometers.

[0112] In step Sa, specifically, the electrohydrodynamic printing process can achieve a resolution of micrometers or even nanometers, which enables very precise control of the thickness and distribution of the masking layer when setting it, meeting the requirements of high-precision manufacturing. The electrohydrodynamic printing process can use a first preset ink with high viscosity, which provides greater flexibility in selecting the masking layer material, allowing for the selection of a suitable viscosity and thickness to improve the uniformity and stability of the masking layer. By flexibly adjusting parameters such as voltage and air pressure, the printing effect of the masking layer can be optimized.

[0113] The applicant has found that when the masking layer is selected as a first preset ink with a viscosity greater than 5 centipoises and less than 500 centipoises and a thickness less than 10 micrometers, it can be stably ejected onto the first fitting without excessive flow, and setting the masking layer to a thickness of less than 10 micrometers can achieve a high-resolution printing effect.

[0114] In some embodiments, the first optical adhesive includes a base adhesive and microparticles filled in the base adhesive. The microparticles play a major supporting role, so that their particle size can be set as needed to obtain a support gap between the first fitting and the second fitting. The base adhesive mainly binds the microparticles together and provides the adhesion to bond the first fitting and the second fitting. Here, the shape of the microparticles can be spherical, so that when doped in the base adhesive, the formed support height is consistent, thereby improving the overall flatness of the cured first optical adhesive. Of course, the shape of the microparticles is not limited and can be a cube, a cylinder, etc. The material of the base adhesive is epoxy resin, polyurethane, polystyrene or acrylic resin, which has strong adhesion and a small shrinkage rate, thereby improving the stability and adhesion of the cured first optical adhesive. At the same time, the material of the microparticles can be selected as a polymer resin or silica and can be selected according to needs.

[0115] Compared with a flowing colloid, the microparticles can provide a more accurate support height, so that the gap between the first fitting and the second fitting can be precisely controlled, improving the surface parallelism of the optical waveguide lens, ensuring that there is no optical path deflection in the optical path transmission, and thus improving the quality of the optical waveguide lens.

[0116] Optionally, the viscosity of the first optical adhesive is greater than 5000 centipoises and less than 200000 centipoises. Optionally, the viscosity of the second optical adhesive is greater than 10 centipoises and less than 3000 centipoises.

[0117] The applicant has found that setting the viscosity of the first optical adhesive to be greater than 5000 cP and less than 200000 cP can balance high fluidity and good stability. Within this viscosity range, the first optical adhesive can smoothly fill the parts to be bonded without overflowing or deforming due to excessive fluidity. Setting the viscosity of the second optical adhesive to be greater than 10 cP and less than 3000 cP can balance moderate fluidity and rapid curing. This viscosity makes the second optical adhesive easy to operate during filling and can also cure quickly subsequently, improving production efficiency.

[0118] In some embodiments, referring to Figure 9 , Figure 9 FIG. shows a schematic flow chart of step S600 in some embodiments of the present application. After step S500, it further includes:

[0119] Step S600: A light-shielding layer is provided on the circumferential side surface of the core layer member.

[0120] In this way, the setting of the light-shielding layer can absorb or reflect the light leaking from the side, prevent stray light from interfering with the main optical path, and further improve the display effect of the optical waveguide lens. Moreover, the light-shielding layer can cover the side of the core layer to prevent external ambient light from intruding or the internal structure from being exposed. It reduces the erosion of the core layer by dust and moisture in the injection space, prevents the risk of a decrease in light transmission efficiency caused by side scratches, and extends the service life of the optical waveguide lens.

[0121] In some embodiments, referring to Figure 10 , Figure 10 FIG. shows a schematic flow chart of step S610 in some embodiments of the present application. Step S600 includes the following steps:

[0122] Step S610: The light-shielding layer is formed by an electrohydrodynamic printing process and using a second preset ink; wherein, the viscosity of the second preset ink is greater than 5 cP and less than 500 cP, and the thickness of the light-shielding layer is less than 10 μm.

[0123] Specifically, carbon black or organic black dye is added to the second preset ink, which can absorb more than 99% of the stray light, reduce reflection interference, and there are no volatile substances after the second preset ink is cured, reducing the pollution to the first fitting. The second preset ink printed by the electrohydrodynamic printing process can achieve nanoscale uniformity and is not prone to cracking.

[0124] Selecting the viscosity of the second preset ink to be greater than 5 cP and less than 500 cP can not only prevent the second preset ink from spreading excessively due to too low surface tension, but also prevent the second preset ink from being stably drawn by the electric field in the electrohydrodynamic printing process. However, too high viscosity will cause difficulties in droplet ejection or nozzle blockage, improving the stability and uniformity of ink printing.

[0125] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0126] The above embodiments only express several implementation manners of the present application, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for preparing an optical waveguide lens, characterized in that: include: Providing a first fitting member and a second fitting member, wherein the first fitting member includes a middle portion and an edge portion surrounding the middle portion; Disposing a first optical adhesive on the edge portion, and pressing the first bonding member, the second bonding member, and the first optical adhesive to form an initial pressed body; The first bonding member, the second bonding member and the first optical adhesive jointly enclose a glue injection space, the initial pressing body has a first opening and a second opening, and the first opening and the second opening are both connected to the glue injection space and the outside; Curing the first optical adhesive of the initial pressed body to form a pressed body; Injecting the second optical glue into the glue injection space of the press-fit body through the first opening, and extracting the gas in the glue injection space of the press-fit body to the outside through the second opening, so that the second optical glue fills the glue injection space of the press-fit body and forms an optical waveguide lens to be cured; The first optical adhesive and the second optical adhesive of the optical waveguide lens to be cured are cured to form the optical waveguide lens.

2. The method for preparing an optical waveguide lens according to claim 1, characterized in that: The first optical glue and the second optical glue are both photocurable glues; the second optical glue is injected into the glue injection space of the press-fit body through the first opening, and the gas in the glue injection space of the press-fit body is extracted to the outside through the second opening, so that the second optical glue fills the glue injection space of the press-fit body and forms an optical waveguide lens to be cured, comprising: The cured pressed body is subjected to a heating treatment so that the temperature of the second optical adhesive is raised to a target temperature and the target temperature is kept unchanged.

3. The method for preparing an optical waveguide lens according to claim 1, characterized in that: The method further comprises: injecting the second optical glue into the glue injection space of the press-fit body through the first opening, and extracting the gas in the glue injection space of the press-fit body to the outside through the second opening, so that the second optical glue fills the glue injection space of the press-fit body and forms an optical waveguide lens to be cured. Acquiring position information of the glue injection liquid level in the glue injection space of the pressed body; The injection rate of the second optical adhesive is determined and controlled according to the position information of the adhesive injection liquid surface.

4. The method for preparing an optical waveguide lens according to claim 3, characterized in that: The second optical glue is injected into the glue injection space of the press-fit body through the first opening, and the gas in the glue injection space of the press-fit body is extracted to the outside through the second opening, so that the second optical glue fills the glue injection space of the press-fit body and forms an optical waveguide lens to be cured, which includes: Placing the pressed body in a target posture; when the pressed body is in the target posture, the direction from the first pasting piece to the second pasting piece is parallel to the direction of gravity; Determining and controlling the injection rate of the second optical adhesive according to the position information of the adhesive injection liquid surface includes: When the ratio of the height of the injection liquid surface to the target size is less than or equal to 0.3, the rate of injecting the second optical adhesive is determined and controlled to be the first target rate; When the ratio of the height of the injection liquid surface to the target size is greater than 0.3 and less than 0.9, the rate of injecting the second optical adhesive is determined and controlled to be a second target rate; When the ratio of the height of the injection liquid surface to the target size is greater than or equal to 0.9, the rate of injecting the second optical adhesive is determined and controlled to be a third target rate; Among them, the first target rate is greater than the second target rate, and the second target rate is greater than the third target rate; the height of the injection liquid surface is the distance between the injection liquid surface and the bottom surface of the injection space along the gravity direction, and the target size is the distance between the two side surfaces of the inner wall of the injection space along the gravity direction.

5. The method for preparing an optical waveguide lens according to claim 4, characterized in that: The first target rate is 8 ml / min to 10 ml / min; and / or The second target rate is 4 ml / min to 6 ml / min; and / or The third target rate is 1 ml / min to 3 ml / min.

6. The method for preparing an optical waveguide lens according to claim 1, characterized in that: The first optical adhesive is arranged on the edge portion, and the first bonding member, the second bonding member and the first optical adhesive are pressed together to form an initial pressed body, which includes: A masking layer is provided on the edge portion; The first optical adhesive is arranged on the edge portion, and the first bonding member, the second bonding member and the first optical adhesive are pressed together to form a pressed body, including: The first optical adhesive is disposed on the masking layer.

7. The method for preparing an optical waveguide lens according to claim 6, characterized in that: The step of providing a masking layer at the edge portion includes: The masking layer is formed by an electrohydrodynamic printing process and using a first preset ink; wherein the viscosity of the first preset ink is greater than 5 centipoise and less than 500 centipoise, and the thickness of the masking layer is less than 10 microns.

8. The method for preparing an optical waveguide lens according to any one of claims 1 to 7, characterized in that: The first optical adhesive comprises a base adhesive and particles filled in the base adhesive; and / or The viscosity of the first optical adhesive is greater than 5000 centipoise and less than 200000 centipoise; and / or The viscosity of the second optical adhesive is greater than 10 centipoise and less than 3000 centipoise.

9. The method for preparing an optical waveguide lens according to claim 1, characterized in that: The first optical adhesive and the second optical adhesive of the optical waveguide lens to be cured are cured to form the optical waveguide lens, and then the method further comprises: A light shielding layer is provided on the peripheral side surface of the optical waveguide lens.

10. The method for preparing an optical waveguide lens according to claim 9, characterized in that: The light shielding layer is provided on the peripheral side of the light waveguide lens, comprising: The light shielding layer is formed by an electrohydrodynamic printing process and using a second preset ink; Wherein, the viscosity of the second preset ink is greater than 5 centipoise and less than 500 centipoise, and the thickness of the light-shielding layer is less than 10 microns.

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