Eye movement tracking light-emitting assembly and AR device

Abstract

The utility model provides an eye movement tracking light-emitting assembly and AR equipment. The eye movement tracking light emitting assembly includes: a light source; the light reflecting element is located on the light emitting side of the light source and comprises a transparent substrate layer and one or more transparent medium layers, at least one transparent medium layer is located on the surface of the side, away from the light source, of the transparent substrate layer, and the at least one transparent medium layer is of a cambered surface structure. The cambered surface structure is located on the backlight side of at least one transparent medium layer, the cambered surface structure and the light source are oppositely arranged, and a first reflective film is arranged on the cambered surface structure. The eye movement tracking light-emitting assembly solves the problem that an eye movement tracking light-emitting assembly in the prior art is large in size.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging equipment, and in particular to an eye-tracking light-emitting component and an AR device. Background Art

[0002] In recent years, AR devices have continued to develop in the market and the demand has increased. As a key component of AR devices, eye tracking light-emitting components track eye movements by measuring the position of the human eye's gaze point or the movement of the eye relative to the head. By recording indicators such as eye gaze time, position, and trajectory, we can understand people's acquisition of real-time information.

[0003] Usually, the eye tracking light-emitting component uses infrared light to illuminate the human eye, receives the infrared light reflected by the human eye through the detector, and then uses image processing technology to obtain the image of the human eye to determine the user's gaze direction. Since the eye tracking light-emitting component needs to emit infrared light to the human eye and cannot block the human eye, and needs to be integrated into the AR device, if the overall volume of the eye tracking light-emitting component is too large, it will be difficult to integrate and will also affect the user experience.

[0004] That is to say, the eye tracking light-emitting components in the prior art have the problem of being large in size. Utility Model Content

[0005] The main purpose of the utility model is to provide an eye-tracking light-emitting component and an AR device to solve the problem of large volume of the eye-tracking light-emitting component in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, an eye tracking light-emitting component is provided, comprising: a light source; a reflective element, the reflective element is located on the light-emitting side of the light source, the reflective element comprises a transparent base layer and a transparent medium layer, the transparent medium layer is one or more layers, at least one transparent medium layer is located on the surface of the transparent base layer on the side away from the light source, at least one transparent medium layer has a curved surface structure, the curved surface structure is located on the backlight side of at least one transparent medium layer, and the curved surface structure is arranged opposite to the light source, and a first reflective film is arranged on the curved surface structure.

[0007] Furthermore, a surface of the reflective element facing the light source has a light incident surface and a light emitting surface, the light incident surface is connected to the light emitting surface or is spaced apart from the light incident surface, and a projection of the arc surface structure on the light incident surface at least partially covers the light incident surface.

[0008] Furthermore, the curved surface structure is a convex surface, and the vertical distance from the side of the curved surface structure away from the light-emitting surface to the transparent base layer is smaller than the vertical distance from the side of the curved surface structure close to the light-emitting surface to the transparent base layer; and / or the vertical distance from the curved surface structure to the transparent base layer gradually increases from the side away from the light-emitting surface to the side close to the light-emitting surface.

[0009] Furthermore, the reflective element further comprises an anti-reflection film, and at least one of the light incident surface and the light emitting surface is provided with the anti-reflection film; and / or the light incident surface is a plane, and the light emitting surface is a plane or a convex surface.

[0010] Furthermore, when the transparent medium layer is a single layer, the light incident surface is connected to the light emitting surface and both the light incident surface and the light emitting surface are located on the transparent base layer; when the transparent medium layer is a multi-layer layer, the multi-layer transparent medium layer includes a first transparent medium layer and a second transparent medium layer, the first transparent medium layer is located on the surface of the side of the transparent base layer away from the light source, the second transparent medium layer is located on the surface of the side of the transparent base layer facing the light source, the light incident surface and the light emitting surface are spaced apart and both the light incident surface and the light emitting surface are located on the second transparent medium layer.

[0011] Furthermore, when the transparent medium layer is a multilayer, the reflective element also includes a second reflective film and a third reflective film, the second reflective film is arranged on the side surface of the second transparent medium layer facing the light source and is located between the light incident surface and the light emitting surface, the third reflective film is located on the side surface of the first transparent medium layer away from the light source, the projection of the third reflective film on the light emitting surface at least partially covers the light emitting surface, and the projection of the third reflective film on the second reflective film at least partially covers the second reflective film.

[0012] Furthermore, the ratio of the maximum height of the curved surface structure to the diameter of the curved surface structure is less than or equal to 0.5; and / or the diameter of the curved surface structure is greater than or equal to 0.05 mm, and the maximum inclination angle α of the curved surface structure is greater than 0° and less than 65°.

[0013] Furthermore, the ratio of the refractive index of the transparent medium layer to the refractive index of the transparent base layer is greater than or equal to 1; and / or the refractive index of the transparent base layer is greater than or equal to 1 and less than or equal to 5, and the thickness of the transparent base layer is greater than 0 mm and less than or equal to 0.5 mm.

[0014] Furthermore, the ratio of the distance from the light source to the curved surface structure to the maximum height of the curved surface structure is greater than 0 and less than or equal to 100; and / or the light emitting angle of the light source is greater than 0° and less than or equal to 20°, and the central wavelength of the light beam emitted by the light source is greater than or equal to 850nm and less than or equal to 940nm.

[0015] According to another aspect of the utility model, an AR device is provided, including: a frame; a light-emitting module, the light-emitting module is arranged on the frame, the light-emitting module includes a micro-electromechanical galvanometer assembly and the above-mentioned eye-tracking light-emitting assembly, the micro-electromechanical galvanometer assembly is located on the light-emitting path of the eye-tracking light-emitting assembly, the micro-electromechanical galvanometer assembly is used to receive the light beam emitted by the eye-tracking light-emitting assembly; a detection module, the light beam emitted by the light-emitting module is irradiated on the human eye, and the detection module is used to receive the light beam reflected by the human eye.

[0016] Applying the technical solution of the utility model, the eye tracking light-emitting component includes a light source and a reflective element, the reflective element is located on the light emitting side of the light source, the reflective element includes a transparent base layer and a transparent medium layer, the transparent medium layer is one or more layers, at least one transparent medium layer is located on the surface of the transparent base layer on the side away from the light source, at least one transparent medium layer has a curved surface structure, the curved surface structure is located on the backlight side of at least one transparent medium layer, and the curved surface structure is arranged opposite to the light source, and a first reflective film is arranged on the curved surface structure.

[0017] The light emitted by the light source outputs parallel light after passing through the reflective element, and then shines on the human eye to detect and identify the dynamics of the human eye. By planning the reflective element to include a transparent base layer and a transparent medium layer, and setting at least one transparent medium layer on the surface of the side of the transparent base layer away from the light source, since the refractive index of the transparent base layer is greater than the refractive index of air, the light beam with a divergence angle emitted by the light source can achieve the contraction of the divergence angle after passing through the transparent base layer in sequence. When the position of the emitted light is the same, the distance between the light source and the reflective element can be reduced by adding a transparent base layer, thereby reducing the light transmission distance and reducing the volume of the eye tracking light emitting component. By setting a curved surface structure with a first reflective film on the backlight side of at least one transparent medium layer, and planning the curved surface structure to be arranged relative to the light source, the light beam emitted by the light source can be stably received and reflected by the curved surface structure, realizing the change of the light transmission direction. At the same time, the curved surface structure can realize the effect of focusing, avoiding the loss of light, and ensuring the light transmission efficiency. At the same time, the deflection and folding of the light transmission path are realized by the curved surface structure, which is conducive to further reducing the volume of the eye tracking light emitting component. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 The light path diagram of the eye tracking light emitting assembly of the first embodiment of the utility model is shown;

[0020] Figure 2 The light path diagram of the eye tracking light emitting assembly of the second embodiment of the utility model is shown;

[0021] Figure 3 A light path diagram of a light emitting module of an AR device according to an optional embodiment of the utility model is shown;

[0022] Figure 4 A schematic diagram showing the structure of an AR device according to an optional embodiment of the present utility model is shown;

[0023] Figure 5A schematic diagram of an eye-tracking light-emitting assembly with light sources at different positions when a transparent substrate is provided and when no transparent substrate is provided is shown;

[0024] Figure 6 The light path diagram of the eye tracking light emitting assembly of the utility model when a transparent substrate is provided and when a transparent substrate is not provided;

[0025] Figure 7 A schematic diagram of the eye-tracking light-emitting component of the utility model is shown when a transparent substrate is provided and when a transparent substrate is not provided, and when the emitted light beams are consistent.

[0026] The above drawings include the following reference numerals:

[0027] 1. Light-emitting module; 2. Detection module; 3. Human eye; 4. Frame; 11. Reflective element; 12. Light source; 13. MEMS galvanometer assembly; 111. Transparent medium layer; 1111. First transparent medium layer; 1112. Second transparent medium layer; 112. Transparent base layer; 113. Arc surface structure; 114. Light incident surface; 115. Second reflective film; 116. Light emitting surface; 117. Third reflective film. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0030] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0031] In order to solve the problem of large volume of the eye-tracking light-emitting component in the prior art, the utility model provides an eye-tracking light-emitting component and an AR device.

[0032] like Figures 1 to 7As shown, the eye tracking light-emitting component includes a light source 12 and a reflective element 11, wherein the reflective element 11 is located on the light-emitting side of the light source 12, and the reflective element 11 includes a transparent base layer 112 and a transparent medium layer 111, wherein the transparent medium layer 111 is one or more layers, and at least one transparent medium layer 111 is located on a surface of the transparent base layer 112 on a side away from the light source 12, and at least one transparent medium layer 111 has a curved surface structure 113, and the curved surface structure 113 is located on the backlight side of at least one transparent medium layer 111, and the curved surface structure 113 is arranged opposite to the light source 12, and a first reflective film is arranged on the curved surface structure 113.

[0033] The light emitted by the light source 12 outputs parallel light after passing through the reflective element 11, and then shines on the human eye 3 to detect and identify the dynamics of the human eye 3. The reflective element 11 is designed to include a transparent base layer 112 and a transparent medium layer 111, and at least one transparent medium layer 111 is disposed on the surface of the transparent base layer 112 on the side away from the light source 12. Since the refractive index of the transparent base layer 112 is greater than the refractive index of the air, the light beam with a divergent angle emitted by the light source 12 can achieve a contraction of the divergent angle after passing through the transparent base layer 112 in sequence. When the position of the emitted light is the same, the distance between the light source 12 and the reflective element 11 can be reduced by adding the transparent base layer 112, thereby reducing the light transmission distance, and further reducing the volume of the eye tracking light emitting component. By arranging a curved surface structure 113 having a first reflective film on the backlight side of at least one transparent medium layer 111, and planning the curved surface structure 113 to be arranged opposite to the light source 12, the light beam emitted by the light source 12 can be stably received and reflected by the curved surface structure 113, thereby realizing a change in the light transmission direction. At the same time, the curved surface structure 113 can realize the function of focusing light, avoid light loss, and ensure light transmission efficiency. At the same time, the deflection and folding of the light transmission path are realized through the curved surface structure 113, which is conducive to further reducing the volume of the eye tracking light-emitting component.

[0034] It should be noted that in the present application, the spot area of ​​the light beam emitted by the light source 12 on the backlight surface of at least one transparent medium layer 111 is less than or equal to the area of ​​the curved surface structure 113, which is conducive to ensuring that the light beam emitted by the light source 12 can be completely received by the curved surface structure 113, thereby ensuring the light utilization efficiency. The first reflective film completely covers the curved surface structure 113, and the first reflective film and the curved surface structure 113 jointly realize the function of reflecting light. The transparent medium layer 111 is a glue layer.

[0035] like Figure 1 and Figure 2 As shown, the side surface of the reflective element 11 facing the light source 12 has a light incident surface 114 and a light emitting surface 116, that is, the light incident side and the light emitting side of the reflective element 11 are located on the same side of the reflective element 11 and the light incident surface 114 and the light emitting surface 116 are located on the same side surface of the reflective element 11. Figure 1 In the embodiment shown, the light incident surface 114 and the light emitting surface 116 are spaced apart. Figure 2 In the illustrated embodiment, the light incident surface 114 is connected to the light emitting surface 116. The projection of the curved surface structure 113 on the light incident surface 114 mostly covers the light incident surface 114. In the preferred embodiment of the present application, the projection of the curved surface structure 113 on the light incident surface 114 completely covers the light incident surface 114. The area of ​​the light incident surface 114 is smaller than the area of ​​the light emitting surface 116, and the area of ​​the curved surface structure 113 is less than or equal to the area of ​​the light emitting surface 116.

[0036] Specifically, the arc surface structure 113 is a convex surface. Specifically, the arc surface structure 113 is convexly arranged in a direction away from the light source 12, and the arc surface structure 113 is arranged non-axisymmetrically. The vertical distance from the side of the arc surface structure 113 away from the light emitting surface 116 to the transparent base layer 112 is smaller than the vertical distance from the side of the arc surface structure 113 close to the light emitting surface 116 to the transparent base layer 112. It should be noted that in Figure 1 and Figure 2 In the figure, the side of the curved surface structure 113 away from the light emitting surface 116 is the right side, and the side of the curved surface structure 113 close to the light emitting surface 116 is the left side. In an optional embodiment of the present application, the vertical distance between the curved surface structure 113 and the transparent base layer 112 gradually increases from the side away from the light emitting surface 116 to the side close to the light emitting surface 116. By rationally planning the shape and curved surface trend of the curved surface structure 113, on the one hand, it is beneficial for the curved surface structure 113 to receive all the light beams emitted by the light source 12, and at the same time, it is beneficial for the curved surface structure 113 to focus the received light beams and transmit them in the direction of the light emitting surface 116.

[0037] In addition, since the vertical distance from the side of the curved surface structure 113 away from the light emitting surface 116 to the transparent base layer 112 is smaller than the vertical distance from the side of the curved surface structure 113 close to the light emitting surface 116 to the transparent base layer 112, and the convex vertex of the curved surface structure 113 is located on the side away from the light emitting surface 116, such a setting is conducive to the right side of the curved surface structure 113 receiving the light that deviates greatly from the required transmission direction to achieve a large deflection of the transmission direction, so as to effectively control the deflection direction of the curved surface structure 113 incident on the curved surface structure 113 from different directions, which is conducive to ensuring the light transmission efficiency.

[0038] In addition, the light beam emitted by the light source 12 enters the transparent base layer 112 from the air and is reflected by the curved surface structure 113. Since the refractive index of the transparent base layer 112 is greater than that of the air, the light emission angle of the light source 12 is reduced at this time, which is beneficial to reducing the area of ​​the curved surface structure 113. This is because the angle of the reflected light is the same. If the light emission angle of the light source 12 is reduced, the range of the curved surface structure 113 will also become smaller, and the sagittal height of the curved surface structure 113, that is, the distance between the convex vertex of the curved surface structure 113 and the lowest point will also become smaller. The reduction of the sagittal height is beneficial to the realization of processing.

[0039] Specifically, the ratio of the maximum height of the curved surface structure 113 to the diameter of the curved surface structure 113 is less than or equal to 0.5. Preferably, the ratio of the maximum height of the curved surface structure 113 to the diameter of the curved surface structure 113 is greater than 0 and less than or equal to 0.5. Such a setting is conducive to ensuring that the size and height of the curved surface structure 113 meet the light focusing requirements, while avoiding the situation where the overall thickness of the reflective element 11 increases due to the curved surface structure 113 being too high, which is conducive to ensuring the rationality of the size of the curved surface structure 113. In the present application, the diameter of the curved surface structure 113 is greater than or equal to 0.05 mm, and the maximum inclination angle α of the curved surface structure 113 is greater than 0° and less than 65°.

[0040] It should be noted that the maximum height of the curved surface structure 113 specifically refers to the maximum sagittal height of the curved surface structure 113, the diameter of the curved surface structure 113 specifically refers to the distance between the side of the curved surface structure 113 away from the light-emitting surface 116 and the side close to the light-emitting surface 116, and the maximum inclination angle of the curved surface structure 113 specifically refers to the distance between its edge and the horizontal plane. Figure 1 The angle between the horizontal planes shown.

[0041] exist Figure 1 and Figure 2 In the embodiment, the reflective element 11 further includes an anti-reflection film, and at least one of the light incident surface 114 and the light emitting surface 116 is provided with an anti-reflection film. In the specific embodiment of the present application, the light incident surface 114 and the light emitting surface 116 are both provided with an anti-reflection film that completely covers the incident light beam and the outgoing light beam. The anti-reflection film is provided to increase the light incident efficiency and the light outgoing efficiency, and reduce energy loss.

[0042] In addition, in the embodiment of the present application, the light emitting angle of the light source 12 is greater than 0° and less than or equal to 20°. The light emitting angle of the light source 12 should not be too large. If the light emitting angle is too large, the edge light cannot be reflected by the curved surface structure 113, resulting in energy loss. Reducing the light emitting angle can completely reflect the light emitted by the light source 12, increase the brightness, reduce power consumption, and at the same time help to shrink the distance between the light source 12 and the reflective element 11, ensuring the miniaturization of the eye tracking light emitting component.

[0043] Specifically, the light source 12 includes an LED light source or a VCSEL light source, and the central wavelength of the light beam emitted by the light source 12 is greater than or equal to 850nm and less than or equal to 940nm. Since the light emitted by the light source 12 in the eye tracking light-emitting component should be invisible to the human eye 3, a near-infrared light with a central wavelength of 850nm to 940nm is selected.

[0044] like Figure 5 As shown, the figure shows two positions of the light source 12 when the transparent base layer 112 is set and when it is not set. The light source N is the position when the transparent base layer 112 is set, and the light source M is the position when the transparent base layer 112 is not set. For the convenience of comparison, the two light sources are shown in the same figure at the same time. It can be seen from the figure that the light emitted by the light source N is refracted after passing through the transparent base layer 112, and the light emitted by the light source M does not pass through the transparent base layer 112, and the light is emitted along the original angle. When the position of the emitted light is the same, the light source N is closer to the curved surface structure 113 than the light source M, that is, the existence of the transparent base layer 112 will reduce the light propagation distance and reduce the volume of the structure.

[0045] like Figure 6 As shown, the left side is a light path diagram of the eye-tracking light-emitting component with a transparent base layer 112, and the right side is a light path diagram of the eye-tracking light-emitting component without the transparent base layer 112. It can be seen from the figure that compared with the eye-tracking light-emitting component with a transparent base layer 112, if the surface shape and curvature of the arc structure 113 remain unchanged, the angle and position deviation of the reflected light are larger, and the corresponding position of the eye-tracking light-emitting component without the transparent base layer 112 can be understood as a layer of air, and the light is not refracted.

[0046] like Figure 7As shown, the left side is a light path diagram of the eye-tracking light-emitting component with a transparent base layer 112, and the right side is a light path diagram of the eye-tracking light-emitting component without the transparent base layer 112. It can be seen from the figure that if the light output angle is consistent with the position, it is necessary to increase the vector height h of the curved structure 113 of the eye-tracking light-emitting component without the transparent base layer 112. A large vector height h makes the process difficult to process. It should also be noted that when the light output angle is consistent with the position, the absence of a transparent base layer 112 has the following defects relative to the provision of a transparent base layer 112 in the present application: when the light of the eye-tracking light-emitting component with a transparent base layer 112 is emitted, the light deflection angle increases due to refraction. If the eye-tracking light-emitting component without a transparent base layer 112 wants to achieve the same output position, it must either increase the vector height h of the arc structure 113 or move the light source 12 away from the arc structure 113. However, increasing the vector height h of the arc structure 113 makes the arc structure 113 difficult to process. At the same time, increasing the distance between the light source 12 and the arc structure 113 will increase the overall volume. In addition, increasing the distance between the light source 12 and the arc structure 113 will reduce the proportion of light reflected by the arc structure 113, thereby increasing energy loss.

[0047] Specifically, the material of the transparent base layer 112 includes one of optical glass and optical plastic, which is conducive to ensuring that the refractive index of the transparent base layer 112 is greater than the refractive index of air. By reasonably constraining the material of the transparent base layer 112, it is conducive to the stable transmission of light therein, while ensuring the focusing effect of the transparent base layer 112.

[0048] In a specific embodiment of the present application, the refractive index of the transparent substrate layer 112 is greater than or equal to 1 and less than or equal to 5. Each optical material has its corresponding refractive index. Since the refractive index of the transparent substrate layer 112 is greater than that of air, the angle range of the light will become smaller after the light enters the transparent substrate layer 112. The sagittal height of the arc surface structure 113 also becomes smaller due to the smaller light range, and the processing difficulty becomes smaller. Through the refractive index of the transparent substrate layer 112 and the curvature of the arc surface structure 113, the optical distribution in the required direction can be obtained according to the law of refraction and reflection.

[0049] Specifically, the thickness of the transparent base layer 112 is greater than 0 mm and less than or equal to 0.5 mm. By reasonably restricting the thickness of the transparent base layer 112, while ensuring that the thickness of the transparent base layer 112 is increased to achieve the light convergence effect, the transparent base layer 112 is prevented from being too thick, which is conducive to ensuring that the reflective element 11 is light and thin.

[0050] It should be noted that the light beam emitted by the light source 12 is reflected at least once after entering the transparent base layer 112. If the sag height of the arc surface structure 113 is low to ensure easy processing and no requirement on the beam width, the light reflected by the arc surface structure 113 to form parallel light can be directly transmitted out without multiple reflections in the transparent medium layer 111 to finally form an ideal light beam.

[0051] Specifically, the ratio of the refractive index of the transparent medium layer 111 to the refractive index of the transparent base layer 112 is greater than or equal to 1. The reflective element 11 can be realized by processes such as embossing, injection molding, and machining. Since the transparent base layer 112 cannot be processed into different surface shapes by embossing, the desired surface shape can be realized by embossing technology by arranging the transparent medium layer 111 on the reflective element 11, and the transparent medium layer 111 can be processed by photolithography and embossing. By rationally planning the refractive index ratio range of the transparent medium layer 111 and the transparent base layer 112, it is beneficial for the transparent medium layer 111 and the transparent base layer 112 to jointly reduce the beam angle of the light source 12.

[0052] Specifically, the ratio of the distance from the light source 12 to the curved surface structure 113 to the maximum height of the curved surface structure 113 is greater than 0 and less than or equal to 100. By controlling the distance from the light source 12 to the curved surface structure 113 and the maximum height of the curved surface structure 113, it is beneficial to compress the distance from the light source 12 to the curved surface structure 113, thereby reducing the distance from the light source 12 to the reflective element 11, and at the same time, it is possible to constrain the height of the curved surface structure 113 to avoid an increase in height, which is beneficial to miniaturizing the eye tracking light-emitting component.

[0053] The following is a detailed explanation of plastic injection molding, nanoimprint technology and machining.

[0054] Plastic injection molding is a processing method for manufacturing plastic products. This method heats plastic particles or granular plastic materials to a molten state, then injects the molten plastic material into a mold, and after cooling and solidification, it is made into the desired plastic product. The plastic used for optical products is usually PC or PMMA.

[0055] Nanoimprint technology is a processing method for preparing nanostructures. It uses pressure at the nanoscale to imprint materials into the desired shape and size. This technology can be used to manufacture functional materials, devices and structures at the nanoscale. In nanoimprint technology, an imprint mold or template is usually used, whose surface has a nanoscale structure of the desired shape. The material is placed on the template surface and then pressure is applied to replicate the structure on the template at the nanoscale. This method can achieve high resolution, accuracy and repeatability on different types of materials.

[0056] Nanoimprint technology includes the following steps:

[0057] Template preparation: Template preparation requires designing the desired nanostructure pattern first, and then using electron beam exposure, laser etching or ion beam etching to create nanoscale structures on the template surface. Templates are usually made of silicon, glass or other materials.

[0058] Imprinting: Place the prepared material to be manufactured on the imprinting machine table, and place the prepared template on the material surface. Apply pressure to make the template contact with the material, and then apply force at a certain temperature and pressure to transfer the structure of the template to the material surface.

[0059] Curing or Treatment: After the imprinting is completed, the material is cured or treated to make the structure more stable or for subsequent processing if required.

[0060] Demolding: Removing the template from the material surface, leaving the desired nanostructure or pattern. Since the nanoimprinting process uses mechanical means to transfer the pattern, the resolution of the final pattern is only related to the resolution of the template. In addition, the template can be used repeatedly, which undoubtedly greatly reduces the processing cost and shortens the processing time.

[0061] The mechanical processing method is to process the structure on the mold through a machine tool, or it can be processed on a transparent material by laser marking.

[0062] The eye tracking light emitting component of the present application is described below in conjunction with specific embodiments and drawings.

[0063] The present application provides two embodiments, in which the structures of the reflective element 11 of the eye-tracking light-emitting assembly are different.

[0064] Embodiment 1

[0065] like Figure 1 , an eye tracking light emitting assembly of embodiment 1 is described. The eye tracking light emitting assembly comprises a light source 12 and a reflective element 11 disposed on the light emitting side of the light source 12 , wherein the reflective element 11 comprises a transparent substrate layer 112 and a transparent medium layer 111 disposed on the transparent substrate layer 112 .

[0066] In this embodiment, the transparent medium layer 111 is multi-layered, and the multi-layered transparent medium layer 111 includes a first transparent medium layer 1111 and a second transparent medium layer 1112. The first transparent medium layer 1111 is located on the side surface of the transparent base layer 112 away from the light source 12, and the second transparent medium layer 1112 is located on the side surface of the transparent base layer 112 facing the light source 12. The light incident surface 114 and the light emitting surface 116 are arranged at intervals, and the light incident surface 114 and the light emitting surface 116 are both located on the second transparent medium layer 1112. In this embodiment, the light incident surface 114 is a plane, and the light emitting surface 116 is a convex surface or a plane. The transparent base layer 112 has two surfaces on both sides that are plane, and the surfaces of the first transparent medium layer 1111 and the second transparent medium layer 1112 that are bonded to the transparent base layer 112 are both planes. The first transparent medium layer 1111 and the second transparent medium layer 1112 are both adhesive layers.

[0067] Specifically, the reflective element 11 further includes a second reflective film 115 and a third reflective film 117. The second reflective film 115 is disposed on a surface of the second transparent medium layer 1112 facing the light source 12 and is located between the light incident surface 114 and the light emitting surface 116. The third reflective film 117 is located on a surface of the first transparent medium layer 1111 away from the light source 12 and the surface where the third reflective film 117 is located transitions sequentially with the arc surface structure 113. The projection of the third reflective film 117 on the light emitting surface 116 at least partially covers the light emitting surface 116, and the projection of the third reflective film 117 on the second reflective film 115 completely covers the second reflective film 115. The area of ​​the light incident surface 114 is smaller than the area of ​​the second reflective film 115 and the area of ​​the light incident surface 114 is smaller than the area of ​​the light emitting surface 116. The area of ​​the arc surface structure 113 is smaller than the area of ​​the third reflective film 117.

[0068] like Figure 1 As shown, the light beam emitted by the light source 12 enters the reflective element 11 through the light incident surface 114 with the anti-reflection film, enters the first transparent medium layer 1111 through the refraction of the second transparent medium layer 1112 and the transparent base layer 112 in turn, and then is incident on the curved surface structure 113 with the first reflective film on the upper surface of the first transparent medium layer 1111, so as to reflect the light beam with a divergent angle of the light source 12 at different angles, and the reflected light beam is parallel light or nearly parallel light. Since the refractive index of the transparent base layer 112 is greater than 1, according to Snell's law, the refracted light passing through it is offset in the normal direction, and the refraction angle is less than the incident angle, thereby changing the divergence angle of the light. Since the divergence angle of the light becomes smaller, the area of ​​the curved surface structure 113 becomes smaller and the sagittal height is reduced, which is conducive to reducing the difficulty of processing.

[0069] However, if the sagittal height of the curved surface structure 113 is still large during actual processing, making the processing difficult, or the range of the emitted light is small, the sagittal height of the curved surface structure 113 can be reduced so that the light reflected by the curved surface structure 113 is not parallel light, but light with a certain divergence angle. At this time, the light beam reflected by the curved surface structure 113 is incident on the surface where the second reflective film 115 is located through the transparent base layer 112 and the second transparent medium layer 1112, and is thus reflected by the second reflective film 115. The reflected light beam then passes through the transparent base layer 112 and enters the first transparent medium layer 1111, and is incident on the third reflective film 117. After being reflected by the third reflective film 117, it is emitted from the light emitting surface 116. If the light beam formed by the reflection of the third reflective film 117 is itself parallel light, the light emitting surface 116 is a plane. Figure 1 For example, if the light beam formed by the reflection of the third reflective film 117 is not parallel light, but is light that diverges at a certain angle, the light-emitting surface 116 is a convex surface to achieve a collimation effect and ensure stable output of parallel light. The incident light and the outgoing light do not affect each other, and the incident light or the outgoing light can be changed separately without affecting other light paths. By changing the light-incoming surface 114, the curved surface structure 113 and the light-emitting surface 116, light with an ideal outgoing angle and a diffusion angle can be obtained.

[0070] When the light-emitting surface 116 is a convex surface, the ratio of the maximum height of the convex surface to the diameter of the convex surface is greater than 0 and less than or equal to 0.5, the diameter of the convex surface is greater than or equal to 0.05 mm, and the maximum inclination angle β of the convex surface is greater than 0 and less than 65°. By reasonably constraining the height, diameter and β of the convex surface, it is helpful to ensure the rationality of the size of the convex surface and avoid the situation where the height of the convex surface is too high. At the same time, it can ensure that the convex surface can adjust the light-emitting angle of non-parallel light, thereby outputting parallel light. It should be noted here that the maximum height of the convex surface is the maximum vector height of the convex surface, and the diameter of the convex surface is Figure 1 The distance from the leftmost to the rightmost side of the convex surface. The maximum inclination angle of the convex surface is the angle between the edge of the convex surface and the horizontal plane.

[0071] Specifically, the first transparent medium layer 1111 and the second transparent medium layer 1112 are arranged on the two side surfaces of the transparent base layer 112 by a nanoimprinting method, or in other optional embodiments, the reflective element 11 of the present application can be formed by injection molding, mechanical processing, etc., then there is no need to use the transparent medium layer 111, and the structure can be directly processed on the transparent base layer 112.

[0072] Embodiment 2

[0073] like Figure 2 As shown, the eye tracking light emitting component of embodiment 2 is described.

[0074] The difference between this embodiment and the first embodiment is that the transparent medium layer 111 is a single layer, and the light beam emitted by the light source 12 is reflected only on one side in the reflective element 11. The transparent medium layer 111 is located on the surface of the side of the transparent base layer 112 away from the base, the light incident surface 114 is connected to the light emitting surface 116, and both the light incident surface 114 and the light emitting surface 116 are located on the surface of the side of the transparent base layer 112 away from the transparent medium layer 111, the light incident surface 114 is a plane, and the light emitting surface 116 is a plane or a convex surface.

[0075] Specifically, since the light incident surface 114 is connected to the light emitting surface 116, a layer of anti-reflection film may be provided on the light incident surface 114 and the light emitting surface 116, and the layer of anti-reflection film covers the light incident surface 114 and the light emitting surface 116. The light beam emitted by the light source 12 enters the transparent base layer 112 through the light incident surface 114, and then enters the curved surface structure 113 on the transparent medium layer 111, and is reflected by the curved surface structure 113, so as to make the light emitted by the light source 12 reflect at a certain angle, and make the reflected light become parallel light or nearly parallel light, and the reflected light enters the transparent base layer 112 through the transparent medium layer 111, and then exits from the light emitting surface 116.

[0076] In addition, if the light reflected by the curved surface structure 113 is parallel light, the light emitting surface 116 is a plane. If the light reflected by the curved surface structure 113 is non-parallel light, the light emitting surface 116 is set to be a convex surface to collimate the light so that the emitted light is parallel light. Figure 2 The incident light and the outgoing light do not affect each other, and the incident light or the outgoing light can be changed separately without affecting other light paths. By changing the light incident surface 114, the arc surface structure 113 and the light outgoing surface 116, the light with an ideal outgoing angle and diffusion angle can be obtained.

[0077] like Figure 3 and Figure 4 As shown, the present application further provides an AR device, the AR device includes a frame 4, a light emitting module 1 and a detection module 2. The light emitting module 1 is arranged on the frame 4. Figure 3 The light path diagram of the light emitting module 1 is shown. The light emitting module 1 includes a micro-electromechanical galvanometer assembly 13 and the above-mentioned eye-tracking light emitting assembly. The micro-electromechanical galvanometer assembly 13 is located on the light emitting path of the eye-tracking light emitting assembly. The micro-electromechanical galvanometer assembly 13 is used to receive the light beam emitted by the eye-tracking light emitting assembly. The light beam emitted by the light source 12 is modulated to form parallel light after passing through the reflective element 11, and then emitted to the micro-electromechanical galvanometer assembly 13, and then irradiated to the human eye 3 through the micro-electromechanical galvanometer assembly 13. The detection module 2 is used to receive the light beam reflected by the human eye 3.

[0078] In this application, if Figure 4As shown, the AR device may be an AR glasses, the frame body 4 may be a spectacle frame, which is composed of a frame mounted on the nose and temples, the light emitting module 1 is arranged on the temples and is located on the side of the temples close to the spectacle frame, the detection module 2 is a detector, and the detector is located on the reflection path of the human eye 3. The light emitted by the light source 12 is first transmitted through the transparent base layer 112, then reflected by the curved surface structure 113, and then returned to the transparent base layer 112 and then transmitted out, and the emitted light is parallel light, which is irradiated onto the human eye 3 through the micro-electromechanical galvanometer assembly 13, and the micro-electromechanical galvanometer assembly 13 emits a parallel light beam through the eye tracking light emitting assembly to form a light beam propagating to the human eye 3. The reflected light of the human eye 3 is received by the detector, and the position of the detector is not limited. By adopting the above-mentioned eye tracking light emitting assembly, it is beneficial to ensure the brightness of the eye tracking light emitting assembly, and at the same time, the volume of the eye tracking light emitting assembly can be reduced and the power consumption can be reduced, thereby compressing the overall volume and power consumption of the light emitting module 1, which is beneficial to the integration of the light emitting module 1 in the AR device.

[0079] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0082] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An eye tracking light emitting component, characterized in that: include: Light source (12); A reflective element (11), the reflective element (11) being located on the light emitting side of the light source (12), the reflective element (11) comprising a transparent base layer (112) and a transparent medium layer (111), the transparent medium layer (111) being one or more layers, at least one transparent medium layer (111) being located on a side of the transparent base layer (112) away from the light source (12), the at least one transparent medium layer (111) having a curved surface structure (113), the curved surface structure (113) being located on the backlight side of the at least one transparent medium layer (111), and the curved surface structure (113) being arranged opposite to the light source (12), and a first reflective film being arranged on the curved surface structure (113).

2. The eye-tracking light-emitting assembly according to claim 1, characterized in that: The reflective element (11) has a light incident surface (114) and a light emitting surface (116) on one side of the surface facing the light source (12); the light incident surface (114) and the light emitting surface (116) are connected or spaced apart; and the projection of the arc surface structure (113) on the light incident surface (114) at least partially covers the light incident surface (114).

3. The eye-tracking light-emitting assembly according to claim 2, characterized in that: The arc surface structure (113) is a convex surface. The vertical distance from the side of the curved surface structure (113) away from the light emitting surface (116) to the transparent base layer (112) is smaller than the vertical distance from the side of the curved surface structure (113) close to the light emitting surface (116) to the transparent base layer (112); and / or The vertical distance between the arc surface structure (113) and the transparent base layer (112) gradually increases from a side far from the light emitting surface (116) to a side close to the light emitting surface (116).

4. The eye-tracking light-emitting assembly according to claim 2, characterized in that: The reflective element (11) further comprises an anti-reflection film, and the anti-reflection film is arranged on at least one of the light incident surface (114) and the light emitting surface (116); and / or The light incident surface (114) is a plane, and the light exit surface (116) is a plane or a convex surface.

5. The eye-tracking light-emitting assembly according to claim 2, characterized in that: When the transparent medium layer (111) is a single layer, the light incident surface (114) is connected to the light emitting surface (116), and both the light incident surface (114) and the light emitting surface (116) are located on the transparent base layer (112); When the transparent medium layer (111) is multi-layered, the multi-layered transparent medium layer (111) comprises a first transparent medium layer (1111) and a second transparent medium layer (1112), the first transparent medium layer (1111) being located on a side surface of the transparent base layer (112) away from the light source (12), the second transparent medium layer (1112) being located on a side surface of the transparent base layer (112) facing the light source (12), the light incident surface (114) being spaced from the light emitting surface (116), and both the light incident surface (114) and the light emitting surface (116) being located on the second transparent medium layer (1112).

6. The eye-tracking light-emitting assembly according to claim 5, characterized in that: When the transparent medium layer (111) is a multilayer, the reflective element (11) further comprises a second reflective film (115) and a third reflective film (117); the second reflective film (115) is arranged on a side surface of the second transparent medium layer (1112) facing the light source (12) and is located between the light incident surface (114) and the light emitting surface (116); the third reflective film (117) is located on a side surface of the first transparent medium layer (1111) away from the light source (12); a projection of the third reflective film (117) on the light emitting surface (116) at least partially covers the light emitting surface (116), and a projection of the third reflective film (117) on the second reflective film (115) at least partially covers the second reflective film (115).

7. The eye-tracking light-emitting assembly according to any one of claims 1 to 6, characterized in that: The ratio between the maximum height of the curved surface structure (113) and the diameter of the curved surface structure (113) is less than or equal to 0.5; and / or The diameter of the arc surface structure (113) is greater than or equal to 0.05 mm, and the maximum inclination angle α of the arc surface structure (113) is greater than 0° and less than 65°.

8. The eye tracking light emitting assembly according to any one of claims 1 to 6, characterized in that: The ratio between the refractive index of the transparent medium layer (111) and the refractive index of the transparent base layer (112) is greater than or equal to 1; and / or the refractive index of the transparent base layer (112) is greater than or equal to 1 and less than or equal to 5, and the thickness of the transparent base layer (112) is greater than 0 mm and less than or equal to 0.5 mm.

9. The eye tracking light emitting assembly according to any one of claims 1 to 6, characterized in that: The ratio of the distance from the light source (12) to the curved surface structure (113) to the maximum height of the curved surface structure (113) is greater than 0 and less than or equal to 100; and / or The light emitting angle of the light source (12) is greater than 0° and less than or equal to 20°, and the central wavelength of the light beam emitted by the light source (12) is greater than or equal to 850 nm and less than or equal to 940 nm.

10. An AR device, characterized in that: include: Frame (4); A light-emitting module (1), wherein the light-emitting module (1) is arranged on the frame (4), and the light-emitting module (1) comprises a micro-electromechanical galvanometer component (13) and an eye-tracking light-emitting component according to any one of claims 1 to 9, wherein the micro-electromechanical galvanometer component (13) is located on a light-emitting path of the eye-tracking light-emitting component, and the micro-electromechanical galvanometer component (13) is used to receive a light beam emitted by the eye-tracking light-emitting component; A detection module (2), wherein the light beam emitted by the light emitting module (1) irradiates a human eye, and the detection module (2) is used to receive the light beam reflected by the human eye.

Images