Method of manufacturing eye tracking glasses

Abstract

This application provides a method for manufacturing eye-tracking glasses, comprising the following steps: providing a substrate portion, wherein a functional film is disposed on the surface of the substrate portion, and electronic components are disposed on the surface of the functional film; providing an injection mold, wherein the injection mold is fastened to the substrate portion to form an injection cavity, and the surface of the functional film where the electronic components are disposed faces the inside of the injection cavity; injecting an optical adhesive into the injection cavity and molding it to form a lens, wherein the electronic components are embedded in the lens; demolding the injection mold from the lens and detaching the functional film from the substrate portion to obtain the eye-tracking glasses.

Description

Technical Field

[0001] This application relates to the field of head-mounted device technology, and more particularly to a method for manufacturing eye-tracking glasses. Background Technology

[0002] Eye-tracking technology is a technique that uses various detection methods, including mechanical, electronic, and optical methods, to obtain the user's current "gaze direction." With the rapid development of computer vision, artificial intelligence, and digital technology, eye-tracking technology has become a hot research area and has wide applications in human-computer interaction, such as virtual reality, augmented reality, driver assistance systems, user experience, and cognitive impairment diagnosis. When implementing eye-tracking technology in head-mounted products such as virtual reality and augmented reality devices, it is usually necessary to install light sources and cameras within the head-mounted devices. To ensure a good user experience and avoid obstructing the user's view, the light source needs to be placed in an appropriate position.

[0003] Eye-tracking technology can generally be categorized into methods such as pupil-corneal reflection, retinal imaging, and calculating the visual center after eye modeling, retinal reflected light intensity, and corneal reflected light intensity. Among these classifications, the first method (pupil-corneal reflection), the second (retinal imaging), and the third (calculating the visual center after eye modeling) all require the use of a camera. Specifically, the first method (pupil-corneal reflection) and the second method (retinal imaging) involve processing the eye image and extracting feature points using a computer to obtain the eye's visual center. The third method (calculating the visual center after eye modeling) requires reconstructing a 3D model of the eye using a camera (infrared camera, depth camera) before calculating the visual center. The fourth method (retinal reflected light intensity) and the fifth method (corneal reflected light intensity) can only obtain the eye's visual center by capturing the intensity of reflected light from one or a few photosensitive sensor components; the reflected light may originate from the corneal center or the retina. Clearly, using photosensitive sensors for eye tracking has certain advantages. However, in existing technologies, the main process steps for placing a photosensitive sensor on a lens are: first, encapsulating the substrate containing the photosensitive sensor; then, attaching a solid optical adhesive to the substrate to adhere the photosensitive sensor to the lens surface. However, this process is very lengthy, requiring multiple coating, drying, and shaping processes, and it is difficult to control the uniformity of each layer, resulting in unstable yield of the final product. How to manufacture eye-tracking glasses with a photosensitive sensor using a stable and efficient process is a question that those skilled in the art need to consider. Summary of the Invention

[0004] To address the problems in the prior art, this application provides a method for manufacturing eye-tracking glasses.

[0005] This application provides a method for preparing eye-tracking glasses, including the following steps:

[0006] A substrate is provided, wherein a functional film is disposed on the surface of the substrate, and electronic components are disposed on the surface of the functional film;

[0007] An injection mold is provided, which is fastened to the substrate to form an injection cavity, and the surface of the functional film on which the electronic components are disposed faces the inside of the injection cavity.

[0008] An optical adhesive is injected into the injection cavity and molded to form a lens, and the electronic components are embedded in the lens;

[0009] The injection mold is demolded from the lens, and the functional film is detached from the substrate to obtain the eye-tracking glasses.

[0010] In one embodiment, the optical adhesive includes optical glue or optical water-based adhesive.

[0011] In one embodiment, the refractive index of the optical adhesive is greater than or equal to 1.

[0012] In one embodiment, the refractive index of the optical adhesive is in the range of 1.48 to 1.53.

[0013] In one embodiment, the electronic component includes at least one of a vertical cavity surface-emitting laser and an infrared light-emitting diode.

[0014] In one embodiment, the substrate portion further includes a carrier plate and a matching film. The matching film is disposed on the surface of the carrier plate, and the functional film is disposed on the surface of the matching film away from the carrier plate. The functional film and the matching film are in separable contact. The electronic component is located on the side of the functional film away from the matching film. The material of the functional film includes polyimide.

[0015] In one embodiment, the injection mold is configured to be recessed inward to form the injection cavity, the injection mold has an opening, and the injection mold is separably engaged with the substrate portion such that the opening is covered by the functional film, or the opening is not covered by the functional film, thus exposing the injection cavity.

[0016] In one embodiment, the injection mold is further provided with an injection through hole and a vacuum through hole, the injection through hole and the vacuum through hole being connected to the injection cavity, and both the injection through hole and the vacuum through hole being located on the side of the injection cavity away from the opening.

[0017] In one embodiment, the injection cavity is configured to have a thinner middle region and a thicker outer region for forming the lens in the shape of a concave lens. The injection through-hole and the vacuum through-hole are both provided corresponding to the outer region of the injection cavity, and the injection through-hole and the vacuum through-hole are spaced apart on both sides of the middle region of the injection cavity.

[0018] In one embodiment, after the injection mold is demolded from the lens, the lens is shaped and polished; after the functional film is detached from the substrate, the functional film is shaped and electrically connected.

[0019] Understandably, the method for manufacturing eye-tracking glasses in this application involves pre-setting electronic components for eye tracking on the surface of a functional film. An injection mold is then provided, with the surface of the functional film containing the electronic components facing the interior of the injection molding cavity. An optical adhesive is injected into the injection molding cavity; the liquid optical adhesive enters the cavity and fills various areas within it through flow. During this process, the functional film containing the electronic components comes into contact with the optical adhesive, and at least a portion of the electronic components on the surface is covered by the optical adhesive. The optical adhesive then solidifies, embedding the electronic components within the lens. This avoids the unavoidable problems of uneven adhesive layer thickness and complex encapsulation processes that inevitably occur when directly attaching electronic components to the surface of a pre-formed lens via an adhesive layer. Attached Figure Description

[0020] Figure 1 This is a schematic flowchart illustrating a method for preparing eye-tracking glasses according to an embodiment of this application.

[0021] Figure 2 This is a partial flowchart illustrating the fabrication method of eye-tracking glasses according to an embodiment of this application.

[0022] Figure 3 This is a partial flowchart illustrating the fabrication method of eye-tracking glasses according to an embodiment of this application.

[0023] Figure 4 This is a partial flowchart illustrating the fabrication method of eye-tracking glasses according to an embodiment of this application.

[0024] Figure 5 This is a partial flowchart illustrating the fabrication method of eye-tracking glasses according to an embodiment of this application.

[0025] Figure 6 This is a partial flowchart illustrating the fabrication method of eye-tracking glasses according to an embodiment of this application.

[0026] Figure 7This is a partial flowchart illustrating the fabrication method of eye-tracking glasses according to an embodiment of this application.

[0027] Figure 8 This is a partial flowchart illustrating the fabrication method of eye-tracking glasses according to an embodiment of this application.

[0028] Explanation of main component symbols

[0029] Eye-tracking glasses 10

[0030] Board part 11

[0031] Bearing plate 111

[0032] Matching membrane 112

[0033] Functional membrane 113

[0034] Electronic Components 114

[0035] Injection mold 12

[0036] Injection cavity 120

[0037] Injection through hole 121

[0038] Vacuum through hole 122

[0039] Opening 123

[0040] Release film 124

[0041] Lens 14

[0042] Optical adhesives 15

[0043] Steps S1, S2, S3, S4

[0044] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0045] The following description will refer to the accompanying drawings to provide a more complete picture of the present application. The drawings illustrate exemplary embodiments of the present application. However, the present application may be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components.

[0046] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to limit the application. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to also include the plural forms. Furthermore, when used herein, “comprising” and / or “including” and / or “having,” integers, steps, operations, components, and / or components, but does not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components, and / or groups thereof.

[0047] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Furthermore, unless expressly defined herein, terms such as those defined in a general dictionary should be interpreted as having the same meaning as they have in the relevant art and in the content of this application, and will not be interpreted as having an idealized or overly formal meaning.

[0048] Eye-tracking technology can generally be categorized into methods such as pupil-corneal reflection, retinal imaging, and calculating the visual center after eye modeling, retinal reflective light intensity, and corneal reflective light intensity. Among these classifications, the first method (pupil-corneal reflection), the second (retinal imaging), and the third (calculating the visual center after eye modeling) all require the use of a camera. Specifically, the first method (pupil-corneal reflection) and the second method (retinal imaging) involve processing the eye image and extracting feature points using a computer to obtain the visual center. The third method (calculating the visual center after eye modeling) requires reconstructing a 3D model of the eye using a camera (infrared camera, depth camera) before calculating the visual center. The fourth method (retinal reflective light intensity) and the fifth method (corneal reflective light intensity) can only obtain the visual center by capturing the intensity of reflected light from the eye using one or a few photosensitive sensor components; the reflected light may originate from the center of the cornea or the retina.

[0049] Clearly, using photosensors for eye tracking has certain advantages. However, in current technology, the main steps for placing photosensors on lenses are: first, encapsulating the substrate containing the photosensor; then, attaching solid optical adhesive to the substrate to adhere the photosensor to the lens surface. This process is extremely lengthy, requiring multiple coating, drying, and shaping steps, and it is difficult to control the uniformity of each layer, resulting in inconsistent yield of the final product.

[0050] Correspondingly, this application provides a method for manufacturing eye-tracking glasses, including the following steps: providing a substrate portion, wherein a functional film is disposed on the surface of the substrate portion, and electronic components are disposed on the surface of the functional film; providing an injection mold, wherein the injection mold is fastened to the substrate portion to form an injection cavity, and the surface of the functional film where the electronic components are disposed faces the inside of the injection cavity; injecting an optical adhesive into the injection cavity and molding it to form a lens, wherein the electronic components are embedded in the lens; demolding the injection mold from the lens, and detaching the functional film from the substrate portion to obtain the eye-tracking glasses.

[0051] Therefore, the method for manufacturing eye-tracking glasses according to this application involves pre-setting electronic components for eye tracking on the surface of a functional film. An injection mold is then provided, with the surface of the functional film containing the electronic components facing the interior of the injection cavity. An optical adhesive is injected into the injection cavity; the liquid optical adhesive enters the cavity and fills various areas within it through flow. During this process, the electronic components on the functional film come into contact with the optical adhesive, and at least a portion of the electronic components on the surface is covered by the optical adhesive. The optical adhesive then solidifies, embedding the electronic components within the lens. This avoids the unavoidable problems of uneven adhesive layer thickness and complex encapsulation processes that are inherent in directly attaching electronic components to the surface of a pre-formed lens via an adhesive layer.

[0052] As will be understood by those skilled in the art, “electronic components” refers to electronic elements and components of small machines and instruments, which are often composed of several parts and can be used in similar products.

[0053] As will be understood by those skilled in the art, a "vertical-cavity surface-emitting laser" refers to a semiconductor in which the laser is emitted perpendicularly to the top surface. Its English name is Vertical-Cavity Surface-Emitting Laser, abbreviated as VCSEL, also translated as Vertical Resonant Cavity Surface-Emitting Laser.

[0054] As will be understood by those skilled in the art, a "vertical cavity surface-emitting laser" refers to a diode that emits infrared light, also known as an IR LED.

[0055] As will be understood by those skilled in the art, "polyimide" refers to a class of polymers containing an imide ring (-CO-NR-CO-) in the main chain, which has good optical properties. Its English name is Polyimide, abbreviated as PI.

[0056] As will be understood by those skilled in the art, "optical adhesives" refer to materials with good light transmittance, such as OCA (Optically Clear Adhesive) or OCR (Optical Clear Resin). Among them, OCR is liquid and is also called liquid optical adhesive, optical water adhesive or LOCA. After curing, OCR is colorless and transparent with a light transmittance of over 98%, and has the characteristics of low curing shrinkage and resistance to yellowing.

[0057] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0058] like Figure 1 As shown in the figure, this application provides a method for preparing eye-tracking glasses 10, including the following steps:

[0059] Step S1: Further integration Figure 2 and Figure 8 As shown, a substrate portion 11 is provided, a functional film 113 is disposed on the surface of the substrate portion 11, and electronic components 114 are disposed on the surface of the functional film 113.

[0060] In this embodiment, the positions of electronic components 114 are pre-determined by placing them on the surface of the functional film 113. It is understood that the functional film 113 can serve as a carrier for the electronic components 114. Fixing the electronic components 114 to the surface of the functional film 113 determines the relative positions of multiple electronic components 114. Simultaneously, traces used to connect the electronic components 114 to each other or to external circuits (e.g., flexible circuit boards) can also be placed on the surface of the functional film 113, allowing for the pre-layout of these traces through the support of the functional film 113.

[0061] In one embodiment, the substrate portion 11 further includes a carrier plate 111 and a matching film 112. The matching film 112 is disposed on the surface of the carrier plate 111, and a functional film 113 is disposed on the surface of the matching film 112 away from the carrier plate 111. The functional film 113 is in separable contact with the matching film 112, and the electronic component 114 is located on the side of the functional film 113 away from the matching film 112. The material of the functional film 113 includes polyimide.

[0062] Understandably, the functional film 113 will be attached to the surface of the spectacle lens 14 after subsequent processing. The functional film 113 should be made of a material with good optical properties (e.g., polyimide, PI). Similarly, to minimize the impact of the functional film 113 on the optical performance of the lens 14, it is preferably a thin film material. However, thin film materials may have poor support properties, making the processing more difficult or negatively impacting overall processing efficiency. Therefore, a rigid carrier plate 111 is needed, which can be made of glass. The functional film 113 is supported on the rigid carrier plate 111, facilitating subsequent processing and the placement of electronic components 114. Considering potential problems with the adhesion between the glass carrier plate 111 and the polyimide functional film 113—for example, the functional film 113 shrinking and wrinkling on the surface of the carrier plate 111 due to temperature changes—further considerations are needed. Therefore, a matching film 112 needs to be introduced between the carrier plate 111 and the functional film 113 to allow the functional film 113 to adhere better to the surface of the carrier plate 111 and to prevent deformation. Meanwhile, the selection of the material for the matching film 112 mainly considers the adhesion effect between the carrier plate 111 and the functional film 113. Its optical performance may not meet the requirements of the lens 14. Therefore, the matching film 112 needs to be designed to be in a separable contact with the functional film 113, allowing the matching film 112 to detach from the functional film 113 and facilitating the separation of the functional film 113 from the carrier plate 111.

[0063] In one embodiment, the electronic component 114 includes at least one of a vertical cavity surface-emitting laser and an infrared light-emitting diode.

[0064] Understandably, vertical-cavity surface-emitting lasers (VCSELs) and infrared light-emitting diodes (LEDs) can be applied to eye-tracking glasses 10. By placing the VCSELs and LEDs in the peripheral area of ​​the eye-tracking glasses 10 and extending the wiring connecting the VCSELs and LEDs outwards to the edge of the eye-tracking glasses 10, the tracking of the wearer's eyes can be achieved.

[0065] In one embodiment, the electronic component 114 may further include a component with signal relay function connected to the vertical cavity surface-emitting laser and the infrared light-emitting diode. The component with signal relay function is not located in the injection molding cavity 120, but is located outside the lens 14 and is used for electrical connection between the lens 14 and the external circuit.

[0066] Step S2: Further integration Figure 3 and Figure 8 As shown, an injection mold 12 is provided, which is fastened to the substrate portion 11 to form an injection cavity 120, and the surface of the functional film 113 on which the electronic components 114 are disposed faces the inside of the injection cavity 120.

[0067] In one embodiment, the injection mold 12 is configured to be recessed to form an injection cavity 120. The injection mold 12 has an opening 123. The injection mold 12 and the substrate portion 11 are separably fastened together, such that the opening 123 is covered by a functional film 113, or the opening 123 is not covered by the functional film 113, thus exposing the injection cavity 120.

[0068] Understandably, the injection cavity 120 is used to injection mold the lens body of the eye-tracking glasses 10. The eye-tracking glasses 10 should have the basic optical characteristics of glasses. The eye-tracking glasses 10 can be set in the shape of a concave lens to meet the basic optical characteristics of glasses. One side of the concave lens is relatively flat, while the other side has an uneven thickness distribution. In order to reduce the difficulty of the manufacturing process, in this embodiment, the substrate portion 11 is set in a relatively flat state and is set to correspond to the opening 123 of the injection mold 12. The injection mold 12 is constructed in an inwardly concave shape to adjust the thickness of each part of the concave lens, thereby realizing the casting of the eye-tracking glasses 10.

[0069] In one embodiment, the injection mold 12 is further provided with an injection through hole 121 and a vacuum through hole 122. The injection through hole 121 and the vacuum through hole 122 are respectively connected to the injection cavity 120. The injection through hole 121 and the vacuum through hole 122 are both located on the side of the injection cavity 120 away from the outlet 123.

[0070] Understandably, the injection through-hole 121 can be used to inject liquid optical adhesive into the injection cavity 120, and the vacuum through-hole 122 can be used to help reduce the vacuum level in the injection cavity 120, so that the injection process can be completed smoothly.

[0071] In one embodiment, the injection cavity 120 is configured to have a thinner middle region and a thicker outer region for forming a concave lens 14. The injection through hole 121 and the vacuum through hole 122 are both provided corresponding to the outer region of the injection cavity 120, and the injection through hole 121 and the vacuum through hole 122 are spaced apart on both sides of the middle region of the injection cavity 120.

[0072] Understandably, the injection through-hole 121 and the vacuum through-hole 122 can respectively correspond to the two areas with the greatest thickness on the outer side, so that the liquid optical adhesive 15 can have a better filling degree in the injection cavity 120, and the molded eye-tracking glasses 10 can have a better production yield.

[0073] Step S3: Further integration Figure 4 and Figure 8 As shown, optical adhesive 15 is injected into the injection cavity and molded to form a lens 14, and electronic components 114 are embedded in the lens 14.

[0074] Understandably, after the liquid optical adhesive 15 is injected into the injection cavity 120, the liquid optical adhesive 15 gradually fills all areas of the injection cavity 120 before solidification. During this process, the originally exposed surface of the electronic component 114 will be covered and wrapped by the liquid optical adhesive 15. After the liquid optical adhesive 15 solidifies, the electronic component 114 will be embedded and installed on the lens 14.

[0075] Understandably, this application uses injection molding to obtain the lens 14, which allows for the simultaneous fabrication of the lens 14 and its connection to the electronic components 114 in a single step, improving yield while simplifying the process and increasing efficiency. Compared to existing technologies, the eye-tracking glasses manufacturing method of this application has higher processing efficiency and a shorter manufacturing cycle.

[0076] In one embodiment, the optical adhesive 15 includes optical adhesive or optical water adhesive.

[0077] Understandably, the optical adhesive 15 can be OCA (Optically Clear Adhesive) or OCR (Optical Clear Resin), preferably OCR.

[0078] In one embodiment, the refractive index of the optical adhesive 15 is greater than or equal to 1.

[0079] In one embodiment, the refractive index of the optical adhesive 15 is in the range of 1.48 to 1.53.

[0080] Understandably, controlling the refractive index of the optical adhesive 15 to be greater than or equal to 1, preferably 1.48 to 1.53, can give the eye-tracking glasses 10 better overall optical performance.

[0081] Step S4: Further integration Figures 5 to 8 As shown, the injection mold 12 is demolded from the lens 14, and the functional film 113 is separated from the substrate portion 11 to obtain the eye-tracking glasses 10.

[0082] In one embodiment, to facilitate the demolding of the lens 14 from the injection mold 12, a release film 124 connected to the injection mold 12 can be provided on the inner surface of the injection mold 12 corresponding to the injection cavity 120. In other embodiments, the optical adhesive 15 can be easily removed from the injection mold 12 by adjusting the materials of the injection mold 12 and the optical adhesive 15.

[0083] In one embodiment, after the injection mold 12 is demolded from the lens 14, the lens 14 is shaped and polished; after the functional film 113 is detached from the substrate portion 11, the functional film 113 is shaped and electrically connected.

[0084] Further integration Figure 5and Figure 6 As shown, after the injection mold 12 is demolded from the lens 14, there will be excess material on the surface of the lens 14, such as excess molding material corresponding to the injection through-hole 121 and the vacuum through-hole 122, or other burrs. It is necessary to use laser or other means to remove the excess material from the lens 14 to ensure that the optical structure of the lens 14 is not damaged.

[0085] Further integration Figure 7 and Figure 8 As shown, after removing the excess portion of the lens 14, the surface of the lens 14 can be polished to give the lens 14 a high degree of flatness and obtain the eye-tracking glasses 10.

[0086] Understandable. Figure 8 The proportions of the eye-tracking glasses 10 and its components, including the lens 14 and functional film 113, shown in the illustration are for illustrative purposes only, to illustrate the structural and positional relationship between the lens 14 and the functional film 113, and do not represent the actual size and proportions of the product. When applied to an actual product, the size of the lens 14 corresponds to a thickness commonly found in actual products, and the thickness of the functional film 113 should be significantly smaller than the thickness of the lens 14. The functional film 113 should cover the main surface of the lens 14 or further enclose the edge of the lens 14. Any portion of the functional film 113 extending beyond the edge of the lens 14 can be removed by cutting in a previous step.

[0087] Understandably, the method for manufacturing the eye-tracking glasses 10 of this application involves pre-setting electronic components 114 for eye tracking on the surface of a functional film 113. An injection mold 12 is then provided, with the surface of the functional film 113 containing the electronic components 114 facing the interior of the injection cavity 120. An optical adhesive 15 is injected into the injection cavity 120. The liquid optical adhesive 15 enters the injection cavity 120 and fills various areas within the cavity through flow. During this process, the functional film 113, containing the electronic components 114, comes into contact with the optical adhesive 15, and at least a portion of the electronic components 114 on this surface is covered by the optical adhesive 15. The optical adhesive 15 then solidifies, embedding the electronic components 114 into the lens 14. This avoids the unavoidable problems of uneven adhesive layer thickness and complex encapsulation processes that occur when directly attaching the electronic components 114 to the surface of the molded lens 14 via an adhesive layer.

[0088] The specific embodiments of this application have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and substitutions can be made to the specific embodiments of this application without departing from the scope of this application. All such changes and substitutions fall within the scope defined by this application.

Claims

1. A method for preparing eye-tracking glasses, characterized in that, Includes the following steps: A substrate is provided, wherein a functional film is disposed on the surface of the substrate, and electronic components are disposed on the surface of the functional film; An injection mold is provided, which is fastened to the substrate to form an injection cavity, and the surface of the functional film on which the electronic components are disposed faces the inside of the injection cavity. An optical adhesive is injected into the injection cavity and molded to form a lens, and the electronic components are embedded in the lens; The injection mold is demolded from the lens, and the functional film is detached from the substrate to obtain the eye-tracking glasses.

2. The method for preparing eye-tracking glasses as described in claim 1, characterized in that, The optical adhesives include optical glues or optical water-based adhesives.

3. The method for preparing eye-tracking glasses as described in claim 1, characterized in that, The refractive index of the optical adhesive is greater than or equal to 1.

4. The method for preparing eye-tracking glasses as described in claim 1, characterized in that, The refractive index of the optical adhesive ranges from 1.48 to 1.

53.

5. The method for preparing eye-tracking glasses as described in claim 1, characterized in that, The electronic components include at least one of a vertical cavity surface-emitting laser and an infrared light-emitting diode.

6. The method for preparing eye-tracking glasses as described in claim 1, characterized in that, The substrate portion further includes a carrier plate and a matching film. The matching film is disposed on the surface of the carrier plate, and the functional film is disposed on the surface of the matching film away from the carrier plate. The functional film and the matching film are in separable contact. The electronic components are located on the side of the functional film away from the matching film. The material of the functional film includes polyimide.

7. The method for preparing eye-tracking glasses as described in claim 1, characterized in that, The injection mold is configured to be recessed inward to form the injection cavity. The injection mold has an opening. The injection mold and the substrate portion are separably fastened together, such that the opening is covered by the functional film, or the opening is not covered by the functional film, thus exposing the injection cavity.

8. The method for preparing eye-tracking glasses as described in claim 7, characterized in that, The injection mold is also provided with an injection through hole and a vacuum through hole. The injection through hole and the vacuum through hole are respectively connected to the injection cavity. The injection through hole and the vacuum through hole are both located on the side of the injection cavity away from the opening.

9. The method for preparing eye-tracking glasses as described in claim 8, characterized in that, The injection cavity is constructed with a thinner middle region and a thicker outer region to form the lens in the shape of a concave lens. The injection through-hole and the vacuum through-hole are both provided corresponding to the outer region of the injection cavity, and the injection through-hole and the vacuum through-hole are spaced apart on both sides of the middle region of the injection cavity.

10. The method for preparing eye-tracking glasses as described in claim 1, characterized in that, After the injection mold is demolded from the lens, the lens is shaped and polished; after the functional film is detached from the substrate, the functional film is shaped and electrically connected.

Images