CN117666146A - Composite lens, optical module, head-mounted display device and virtual display system - Google Patents
Composite lens, optical module, head-mounted display device and virtual display system Download PDFInfo
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- CN117666146A CN117666146A CN202311673611.8A CN202311673611A CN117666146A CN 117666146 A CN117666146 A CN 117666146A CN 202311673611 A CN202311673611 A CN 202311673611A CN 117666146 A CN117666146 A CN 117666146A
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Abstract
The invention relates to the technical field of optical imaging, in particular to a compound lens, an optical module, head-mounted display equipment and a virtual display system; the composite lens comprises a first lens layer made of a glass material and a second lens layer made of a resin material, wherein an optical film layer is arranged between the first lens layer and the second lens layer, and the first lens layer, the optical film layer and the second lens layer are mutually attached; the optical film layer is one or a combination of more of a beam splitting layer, a phase delay layer, an anti-reflection layer and a polarization layer; the composite lens adopts the design scheme that the first lens layer, the second lens layer and the optical film layer which are made of different materials are compounded, chromatic aberration and aberration are reduced in a VR optical module, and the surface reflection can be reduced by adopting the composite design, so that ghosts are reduced, and imaging quality is improved. In addition, the glass and resin composite structure is adopted, so that the weight of the optical module is reduced while the overall structural strength is ensured.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a compound lens, an optical module, head-mounted display equipment and a virtual display system.
Background
Virtual Reality (VR) combines with various technical achievements such as three-dimensional graphic display, multimedia, simulation and the like of a computer, and a realistic Virtual world with various sensory experiences such as three-dimensional vision, touch sense, smell sense and the like is generated by means of equipment such as the computer. VR technology is continually evolving towards ultra-high definition displays, such as 2.5K, 4K resolution display technologies. For the design of a high-resolution VR ray machine, more than 2 lenses are generally matched to play the best display effect.
One of the prior art adopts a combination scheme of a plurality of pieces of spherical glass, but the common spherical glass has the problems of heavy weight and large spherical aberration, and the combination of the plurality of pieces of spherical glass can correct the spherical aberration and the chromatic aberration, but the weight can be further increased, which is not beneficial to controlling the weight of the optical machine; is not in line with the light-weight development route of the prior VR ray machine; in the second prior art, a scheme of adopting a plurality of resin aspherical lenses is adopted, but the stress birefringence during the molding of the resin aspherical lenses has larger influence on imaging; meanwhile, the existing multi-piece lens design such as a combination scheme of multi-piece spherical glass or a scheme of multi-piece resin aspherical lens has the problems that reflection between adjacent lens surfaces is more and imaging Ghost is easy to generate in the use process; thereby degrading the imaging quality.
Disclosure of Invention
In order to solve the above problems, the present application provides a composite lens, an optical module, a head-mounted display device and a virtual display system, which not only reduce the overall quality of a VR optical machine and improve the imaging quality by the bonding design between a first lens layer made of a glass material, a second lens layer made of a resin material and an optical film layer; and imaging Ghost can be reduced, and the image forming effect can be improved.
In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:
in a first aspect, the present application provides a composite lens, including a first lens layer made of a glass material, and a second lens layer made of a resin material, wherein an optical film layer is disposed between the first lens layer and the second lens layer, and the first lens layer, the optical film layer and the second lens layer are mutually attached; the optical film layer is one or more of a beam splitting layer, a phase delay layer, an anti-reflection layer and a polarization layer.
It will be appreciated that the present application provides a composite lens with an innovative design of mutual fit between a first lens layer made of a glass material, a second lens layer made of a resin material and an optical film layer; the second lens layer of the composite lens is prepared from the resin material, so that the characteristic of light weight of the resin material can be utilized, the overall quality of the composite lens is reduced, the light weight of the head-mounted display device is facilitated, and the wearing comfort of a human body is improved; the characteristic of strong plasticity of the resin material can be utilized, so that the surface shape of the optical design surface of the second lens can be designed differently according to actual requirements, and the composite lens can obtain more design freedom degree as a whole, thereby effectively reducing CRA (principal ray angle);
Meanwhile, the composite lens comprises a first lens layer and a second lens layer which are prepared from two different materials, and the refractive index matching of light between glass and resin of different materials can be utilized, so that the overall chromatic aberration of the composite lens is greatly reduced; and the first lens layer, the optical film layer and the second lens layer are tightly attached to each other, so that the inter-plane reflection between the adjacent lens layers and/or the optical film layers can be reduced, the imaging Ghost (Ghost) is reduced, and the imaging quality is further improved.
In an alternative embodiment of the present application, the optical film layer is attached to the surface of the first lens layer or the surface of the second lens layer by means of gluing or coating.
Coating is understood to mean the process of coating the surface of an optical component with one or more thin films of metal or medium. The purpose of coating film on the surface of the optical part is to reduce or increase the requirements of light reflection, beam splitting, color separation, light filtering, polarization and the like. The common coating methods include vacuum coating (one of physical coating) and chemical coating; therefore, in the embodiment, the optical film layer is arranged on the surface of the first lens layer by adopting a film coating process, so that the connection stability between the optical film layer and the first lens layer or the second lens layer can be improved, and the whole composite lens can meet the requirements of reducing or increasing light reflection, beam splitting, color separation, light filtering, polarization and the like; meanwhile, the overall thickness of the composite lens obtained by adopting the coating process is thinner.
The optical film layer and the first lens layer or the second lens layer are suitable for the film material with certain thickness of the optical film layer in a gluing mode, and the film material can be independently formed in a large batch and then glued with the first lens layer or the second lens layer, so that the performance of the film material can be independently controlled.
In an alternative embodiment of the present application, the second lens layer is adhered to the surface of the optical film layer by means of gluing or injection molding.
It is understood that injection molding, also known as injection molding, is a method of injection and molding. The injection molding method has the advantages of high production speed, high efficiency, automation in operation, multiple patterns, various shapes, large size, accurate product size, easy updating of the product, and capability of forming parts with complex shapes, and is suitable for the field of mass production, products with complex shapes and other molding processing; therefore, in this embodiment, the injection molding process is adopted to set the second lens on the surface of the optical film layer, so that not only can the connection stability between the optical film layer and the second lens layer be improved, but also the connection gap between the optical film layer and the second lens layer can be reduced, and the imaging Ghost (Ghost) can be reduced; meanwhile, the second lens layer with the specific surface shape can be obtained through injection molding according to actual needs. In addition, the thickness of the second lens layer can be made thinner by adopting an injection molding process, so that the overall thickness of the composite lens obtained by compounding is made thinner.
In an optional embodiment of the present application, the first lens layer, the optical film layer and the second lens layer are attached to each other in a manner that at least one of the following is satisfied:
the mode of mutual lamination among the first lens layer, the optical film layer and the second lens layer comprises at least one of the following:
case 1: the optical film layer is glued on the surface of the first lens layer, and the second lens layer is glued on the surface of the optical film layer;
case 2: the optical film layer is glued to the surface of the first lens layer, and the surface of the optical film layer is subjected to injection molding to obtain the second lens layer;
case 3: the surface of the first lens layer is coated with a film to obtain the optical film layer, and the second lens layer is glued on the surface of the optical film layer;
case 4: the surface of the first lens layer is coated with a film to obtain the optical film layer, and the surface of the optical film layer is injection molded to obtain the second lens layer;
case 5: the surface of the second lens layer is coated with a film to obtain the optical film layer, and the first lens layer is glued on the surface of the optical film layer;
case 6: and the surface of the optical film layer is subjected to injection molding to obtain a second lens layer, and the first lens layer is glued on the surface of the optical film layer.
In an alternative embodiment of the present application, the combined optical surface of the first and second lens layers with respect to the optical film layer satisfies at least one of:
the combined optical surface between the first lens layer and the second lens layer is arranged in a plane;
it can be appreciated that if the combined optical surfaces between the first lens layer and the second lens layer are arranged in a plane, the process difficulty is lower when the optical film layer and the first lens layer are glued and when the second lens layer and the optical film layer are glued, thereby being beneficial to reducing the processing cost.
The combined optical surfaces between the first lens layer and the second lens layer are arranged in a cambered surface manner, and the specific cambered surface can be a concave surface and/or a convex surface;
it can be appreciated that if the combined optical surface between the first lens layer and the second lens layer is configured as an arc surface, compared with the above-mentioned combined optical surface configured as a plane, the arc surface has a converging or diverging function for light transmission, which is equivalent to adding an optical design surface to the light path design, and can improve imaging quality in a limited module space.
In an alternative embodiment of the present application, an optical surface of a side of the first lens layer, which is close to the optical film layer, is provided with a spherical surface;
the optical surface of one side of the second lens layer far away from the optical film layer is provided with an aspheric surface or a free curved surface.
In an alternative embodiment of the present application, the central thickness of the first lens layer along the optical axis direction is set as D1, the central thickness of the second lens layer along the optical axis direction is set as H2, and the following relational expressions are satisfied by H1 and H2: H2/H1 is more than or equal to 0.1 and less than or equal to 2.
Preferably, the H1 and H2 satisfy the following relation: H2/H1 is more than or equal to 0.1 and less than or equal to 1.
More preferably, the H1 and H2 satisfy the following relation: H2/H1 is more than or equal to 0.1 and less than or equal to 0.6.
In an alternative embodiment of the present application, the diameter of the first lens layer is set to be D1, the diameter of the second lens layer is set to be D2, the diameter of the optical film layer is set to be D3, and the following relational expressions are satisfied by D1, D2, and D3: d3 < D1 and D3 < D2.
It will be appreciated that the diameter reduction of the optical film layer does not affect optical imaging, and only the central region of the optical film is used for optical imaging, i.e. the optical film layer is smaller than the first lens layer and the second lens layer by one turn, and in the resin injection molding process of the second lens layer, the second lens layer covers the periphery of the optical film layer, i.e. most of the second lens layer covers the surface of the optical film layer, and the outer ring of the second lens layer covers the surface of the first lens layer, thereby improving the stability of the composite lens.
In a second aspect, the present application provides an optical module comprising a display screen, a first retardation layer, a partially transmissive partially reflective layer, a second retardation layer, a reflective polarizing layer, and the compound lens of the first aspect; the display screen, the first phase delay layer, the partial transmission partial reflection layer, the second phase delay layer and the reflection polarization layer are sequentially arranged;
the optical film layer arranged in the composite lens is any one or more of a first phase delay layer, a partial transmission partial reflection layer, a second phase delay layer and a reflection polarization layer of the optical module, and the position of the composite lens corresponds to the position of the optical film layer.
Specifically, the structure of the optical module may include at least one of the following:
case 1: the optical module comprises a display screen, a first phase delay layer, a second phase delay layer, a reflective polarizing layer and a composite lens, wherein an optical film layer in the composite lens is a partial transmission partial reflection layer; the first phase delay layer, the compound lens, the second phase delay layer and the reflective polarizing layer are sequentially arranged along the light emitting direction of the display screen; the display light beam emitted by the display screen sequentially passes through the first phase delay layer, the compound lens, the second phase delay layer and the reflective polarizing layer and then enters human eyes.
Case 2: the optical module comprises a display screen, a first phase delay layer, a second phase delay layer, a partial transmission partial reflection layer and a composite lens, wherein an optical film layer in the composite lens is a reflection polarization layer; the display screen comprises a first phase delay layer, a partial transmission partial reflection layer, a second phase delay layer and a compound lens which are sequentially arranged along the light emitting direction of the display screen; the display light beam emitted by the display screen sequentially passes through the first phase delay layer, the partial transmission and partial reflection layer, the second phase delay layer and the compound lens and then enters human eyes; wherein the first lens layer of the compound lens is disposed proximate to the human eye.
In an alternative embodiment of the present application, the partially transmissive and partially reflective layer is disposed on an optical surface of the second lens layer away from the first lens layer, and the optical surface of the second lens layer away from the first lens layer is an aspheric surface or a free-form surface.
It can be understood that the effect of disposing the partially transmissive and partially reflective layer on the aspherical surface of the second lens layer is that, in the folded optical path, the reflection of the partially transmissive and partially reflective layer contributes significantly to the optical power of the optical module, and the degree of freedom of designing the optical path by disposing the semi-transmissive and semi-reflective layer on the aspherical surface is higher, so that the imaging quality can be improved better by designing the aspherical surface.
In an alternative embodiment of the present application, the first lens layer of the compound lens is disposed near one side of the human eye, and the second lens layer of the compound lens is disposed near one side of the display screen.
It can be understood that the first lens made of glass is used as an appearance surface, so that the structural strength is higher, the wear resistance and the corrosion resistance are stronger, and the service life of the optical module can be effectively prolonged.
In a third aspect, the present application provides a head-mounted display device, in which an optical module is configured, the optical module being any one of the optical modules in the second aspect.
In a fourth aspect, the present application provides a virtual display system, where the virtual display system includes an external controller and the head-mounted display device described in the third aspect, and the external controller is connected with the head-mounted display device.
The beneficial effects are that:
the embodiment of the application provides a composite lens, through the innovative design of mutual lamination among a first lens layer made of a glass material, a second lens layer made of a resin material and an optical film layer, the second lens layer of the composite lens is made of the resin material, so that the composite lens not only can utilize the characteristic of light weight of the resin material, but also can reduce the overall quality of the composite lens, and is beneficial to realizing the light weight of head-mounted display equipment and improving the wearing comfort of a human body; and the characteristic of strong plasticity of the resin material can be utilized, so that the surface shape of the optical design surface of the second lens layer can be designed differently according to actual requirements, and the whole composite lens can obtain more design freedom, thereby effectively reducing CRA (principal ray angle).
In addition, the composite lens comprises a first lens layer and a second lens layer which are prepared from two different materials, and the refractive index matching of light between glass and resin with different materials can be utilized, so that the overall chromatic aberration of the composite lens is greatly reduced; and the first lens layer, the optical film layer and the second lens layer are tightly attached to each other, so that the inter-plane reflection between the adjacent lens layers and/or the optical film layers can be reduced, the imaging Ghost (Ghost) is reduced, and the imaging quality is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The methods, systems, and/or programs in the accompanying drawings will be described further in terms of exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. These exemplary embodiments are non-limiting exemplary embodiments, wherein the exemplary numbers represent like mechanisms throughout the various views of the drawings.
Fig. 1 is a schematic structural diagram of a first compound lens provided in the present application.
Fig. 2 is a schematic structural diagram of a second compound lens provided in the present application.
Fig. 3 is a schematic structural diagram of a third compound lens provided in the present application.
Fig. 4 is a schematic structural diagram of a fourth compound lens provided in the present application.
Fig. 5 is a schematic structural diagram of a first optical module provided in the present application.
Fig. 6 is a schematic structural diagram of a second optical module provided in the present application.
Fig. 7 is a diagram showing the optical path design of a conventional optical module without using a compound lens.
FIG. 8 is a schematic diagram of a conventional optical module without using a compound lens.
Fig. 9 is an MTF graph of a conventional optical module that does not employ a compound lens.
Fig. 10 is a light path design diagram of an optical module employing the compound lens of the present application.
FIG. 11 is a schematic diagram of chromatic aberration of an optical module employing a compound lens of the present application.
Fig. 12 is an MTF graph of an optical module employing a compound lens of the present application.
Fig. 13 is a light path design diagram of another optical module employing a compound lens of the present application.
Fig. 14 is an MTF plot for another optical module employing a compound lens of the present application.
Fig. 15 is a light path design diagram of another optical module employing the compound lens of the present application.
Fig. 16 is an MTF graph of another optical module employing a compound lens of the present application.
Fig. 17 is a schematic structural view of the head-mounted display device of the present application.
Reference numerals illustrate: a compound lens 01, a first lens layer 001, a second lens layer 002, an optical film layer 003, an optical module 02, a display 021, a first phase retardation layer 022, a partially transmitting partially reflecting layer 023, a second phase retardation layer 024, a reflective polarizing layer 025, and a head-mounted display device 03.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Example 1
The application provides a compound lens suitable for application to optical modules and head mounted display devices (Head mounted display, HMD), such as VR head mounted display devices. The VR head mounted display device may include, for example, VR smart glasses or VR smart helmets, etc., to which the embodiments of the present application are not limited in terms of the specific form of the head mounted display device. Of course, the optical module provided in the embodiment of the application may also be applied to other types of electronic devices.
Virtual Reality (VR) combines with various technical achievements such as three-dimensional graphic display, multimedia, simulation and the like of a computer, and a realistic Virtual world with various sensory experiences such as three-dimensional vision, touch sense, smell sense and the like is generated by means of equipment such as the computer. VR technology is continually evolving towards ultra-high definition displays, such as 2.5K, 4K resolution display technologies. For the design of a high-resolution VR ray machine, more than 2 lenses are generally matched to play the best display effect. One of the prior art adopts a combination scheme of a plurality of pieces of spherical glass, but adopts a single piece of common spherical glass to solve the problems of heavy weight and large spherical aberration, and adopts a combination of a plurality of pieces of spherical glass to correct spherical aberration and chromatic aberration, but further increases the weight, is not beneficial to controlling the weight of the optical machine, and is inconsistent with the light weight development route of the existing VR optical machine; in addition, as the surface of the glass lens is difficult to form an aspheric surface, the cost is high, and the glass lens is generally designed in a spherical shape, the degree of freedom of the design is lower when the glass lens is applied in an optical module, and the imaging quality is not improved; in the second prior art, a scheme of adopting a plurality of resin aspherical lenses is adopted, but the stress birefringence during the molding of the resin aspherical lenses has larger influence on imaging; meanwhile, in the existing multi-piece lens design such as a combination scheme of a plurality of spherical glass pieces and a scheme of a plurality of resin aspheric lenses, gaps exist between adjacent lenses, more reflection exists between the adjacent lens faces in the use process, the problem of imaging Ghost (Ghost) is easy to generate, and the imaging quality is reduced.
Against the above background, the present application provides a composite lens, as shown in any one of fig. 1 to 4, comprising a first lens layer 001 made of a glass material, a second lens layer 002 made of a resin material, an optical film layer 003 provided between the first lens layer 001 and the second lens layer 002, and the first lens layer 001, the optical film layer 003 and the second lens layer 002 being bonded to each other; the optical film layer 003 is a combination of one or more of a beam splitting layer, a phase retardation layer, an antireflection layer, and a polarizing layer.
In this embodiment, the beam splitting layer is preferably a partially transmissive partially reflective material, the phase retardation layer is preferably a quarter-phase retardation material, and the polarizing layer is preferably a polarizing beam splitting material, including a reflective polarizing material and an absorptive polarizing material.
The first lens layer 001 made of glass material, the second lens layer 002 made of resin material and the optical film layer 003 are mutually attached, so that the second lens layer 002 of the composite lens 01 is prepared from the resin material; therefore, the composite lens 01 not only can utilize the characteristic of light weight of the resin material, so that the overall quality of the composite lens 01 is reduced, thereby being beneficial to realizing the light weight of the head-mounted display equipment and improving the wearing comfort of a human body; and the characteristic of strong plasticity of the resin material can be utilized, so that the surface shape of the optical design surface of the second lens layer 002 can be designed differently according to actual requirements, and more design freedom can be obtained for the whole composite lens 01, thereby effectively reducing CRA (principal ray angle).
In addition, the composite lens 01 comprises a first lens layer 001 and a second lens layer 002 which are prepared from two different materials, and the refractive index matching of light between glass and resin with different materials can be utilized, so that the overall chromatic aberration of the composite lens 01 is greatly reduced; and the first lens layer 001, the optical film layer 003 and the second lens layer 002 are tightly adhered to each other, so that the inter-plane reflection between the adjacent lens layers and/or the optical film layer 003 can be reduced, the imaging Ghost (Ghost) is reduced, and the imaging quality is further improved.
As shown in fig. 1; in this embodiment, when the optical film layer 003 is provided as one layer, the structure of the compound lens 01 includes at least one of the following:
single layer structure 1: the compound lens 01 includes a first lens layer 001, a second lens layer 002, and a beam splitting layer; the beam splitting layer is adhered and arranged between the first lens layer 001 and the second lens layer 002;
single layer structure 2: the compound lens 01 includes a first lens layer 001, a second lens layer 002, and a phase retardation layer; the phase delay layer is adhered and arranged between the first lens layer 001 and the second lens layer 002;
single layer structure 3: the compound lens 01 comprises a first lens layer 001, a second lens layer 002 and an anti-reflection layer; the anti-reflection layer is adhered between the first lens layer 001 and the second lens layer 002;
Single layer structure 4: the compound lens 01 includes a first lens layer 001, a second lens layer 002, and a polarizing layer; the polarizing layer is arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
as shown in fig. 2; in this embodiment, when the optical film layer 003 is provided as a double layer, the structure of the compound lens 01 includes at least one of the following:
bilayer structure 1: the compound lens 01 comprises a first lens layer 001, a second lens layer 002 beam splitting layer and a phase delay layer; the beam splitting layer and the phase delay layer are attached and arranged between the first lens layer 001 and the second lens layer 002;
bilayer structure 2: the compound lens 01 comprises a first lens layer 001, a second lens layer 002, a beam splitting layer and an anti-reflection layer; the beam splitting layer and the anti-reflection layer are arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
bilayer structure 3: the compound lens 01 includes a first lens layer 001, a second lens layer 002, a beam splitting layer and a polarizing layer; the beam splitting layer and the polarizing layer are arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
bilayer structure 4: the compound lens 01 comprises a first lens layer 001, a second lens layer 002, a phase retardation layer and an anti-reflection layer; the phase delay layer and the anti-reflection layer are arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
Double layer structure 5: the compound lens 01 includes a first lens layer 001, a second lens layer 002, a phase retardation layer, and a polarizing layer; the phase retardation layer and the polarization layer are attached between the first lens layer 001 and the second lens layer 002;
double layer structure 6: the compound lens 01 comprises a first lens layer 001, a second lens layer 002, an anti-reflection layer and a polarization layer; the anti-reflection layer and the polarization layer are arranged between the first lens layer 001 and the second lens layer 002 in a laminating way;
as shown in fig. 3; in this embodiment, when the optical film layer 003 is provided as three layers, the structure of the compound lens 01 includes at least one of the following:
three-layer structure 1: the compound lens 01 comprises a first lens layer 001, a second lens layer 002, a beam splitting layer, a phase delay layer and an antireflection layer; the beam splitting layer, the phase delay layer and the anti-reflection layer are arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
three-layer structure 2: the compound lens 01 includes a first lens layer 001, a second lens layer 002, a beam splitting layer, a phase retardation layer, and a polarizing layer; the beam splitting layer, the phase delay layer and the polarization layer are arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
three-layer structure 3: the compound lens 01 comprises a first lens layer 001, a second lens layer 002, a beam splitting layer, an anti-reflection layer and a polarizing layer; the beam splitting layer, the anti-reflection layer and the polarizing layer are arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
Three-layer structure 4: the compound lens 01 comprises a first lens layer 001, a second lens layer 002, a phase retardation layer, an anti-reflection layer and a polarization layer; the phase delay layer, the anti-reflection layer and the polarization layer are arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
as shown in fig. 4; in this embodiment, when the optical film layer 003 is provided as four layers, the structure of the compound lens 01 may include at least one of the following:
four-layer structure 1: the compound lens 01 comprises a first lens layer 001, a second lens layer 002, a beam splitting layer, a phase retardation layer, an anti-reflection layer and a polarization layer; the beam splitting layer, the phase delay layer, the anti-reflection layer and the polarization layer are arranged between the first lens layer 001 and the second lens layer 002 in a bonding way;
in a preferred embodiment, the optical film layer 003 is adhered to the surface of the first lens layer 001 or the surface of the second lens layer by means of gluing or coating.
Coating is understood to mean the process of coating the surface of an optical component with one or more thin films of metal or medium. The purpose of coating film on the surface of the optical part is to reduce or increase the requirements of light reflection, beam splitting, color separation, light filtering, polarization and the like. The common coating method comprises vacuum coating and chemical coating, wherein the vacuum coating is one of physical coating; in this embodiment, the optical film layer 003 is covered on the surface of the first lens layer 001 or the surface of the second lens layer 002 by adopting a film plating process, so that not only the structural stability between the optical film layer 003 and the first lens layer 001 can be improved, but also the composite lens 01 can integrally meet the requirements of reducing or increasing the reflection, beam splitting, color separation, light filtering, polarization and the like of light; meanwhile, the overall thickness of the composite lens 01 obtained by adopting the coating process is thinner.
In addition, the optical film layer 003 and the first lens layer 001 or the second lens layer 002 are suitable for a film material with a certain thickness of the optical film layer 003 in a gluing mode, and the film material can be independently formed in a large batch and then glued with the first lens layer 001 or the second lens layer 002, so that the performance of the film material can be independently controlled.
In a preferred embodiment, the second lens layer 002 is adhered to the surface of the optical film layer 003 by gluing or injection molding.
It is understood that injection molding, also known as injection molding, is a method of injection and molding. The injection molding method has the advantages of high production speed, high efficiency, automation in operation, multiple patterns, various shapes, large size, accurate product size, easy updating of the product, and capability of forming parts with complex shapes, and is suitable for the field of mass production, products with complex shapes and other molding processing; therefore, in this embodiment, the second lens layer 002 is disposed on the surface of the optical film layer 003 by adopting an injection molding process, so that not only the connection stability between the optical film layer 003 and the second lens layer 002 can be improved, but also the connection gap between the optical film layer 003 and the second lens layer 002 can be reduced, and the inter-plane reflection is reduced, so that the imaging Ghost (Ghost) is reduced; meanwhile, the second lens layer 002 with a specific surface shape can be obtained through molding according to actual needs, and the method is simple and convenient. The thickness of the second lens layer obtained by molding can be controlled in a thinner range by adopting an injection molding process, so that the overall thickness of the obtained composite lens 01 is thinner.
In a preferred embodiment, the first lens layer 001, the optical film layer 003 and the second lens layer 002 are adhered to each other in a manner comprising at least one of the following:
case 1: the optical film layer 003 is glued on the surface of the first lens layer 001, and the second lens layer 002 is glued on the surface of the optical film layer 003;
case 2: the optical film layer 003 is glued on the surface of the first lens layer 001, and the surface of the optical film layer 003 is subjected to injection molding to obtain a second lens layer 002;
case 3: coating the surface of the first lens layer 001 to obtain an optical film layer 003, and bonding the second lens layer 002 on the surface of the optical film layer 003;
case 4: coating a film on the surface of the first lens layer 001 to obtain an optical film layer 003, and performing injection molding on the surface of the optical film layer 003 to obtain a second lens layer 002;
case 5: coating a film on the surface of the second lens layer 002 to obtain an optical film layer 003, and bonding the first lens layer 001 on the surface of the optical film layer 003;
case 6: the surface of the optical film layer 003 is injection molded to obtain the second lens layer 002, and the first lens layer 001 is glued to the surface of the optical film layer 003.
In the application, the forming mode of the condition 4 is preferably adopted, on one hand, when the surface of the glass lens is coated with the film, the stability of the film layer is higher, the optical performance is more stable, and compared with the film-sticking process, the process difficulty of film coating on a curved surface is lower, so that the cost can be effectively controlled; on the other hand, in the process of forming the second lens layer by injection molding after coating the film on the glass lens, the coated glass lens is required to be placed into the injection molding cavity, the glass substrate can provide enough strength, the yield of injection molding and the quality of the composite lens are improved, and compared with the mode of independently injection molding the second lens layer and then gluing the second lens layer with a glass lens, the second lens layer is directly injection molded on the glass lens substrate, so that the second lens layer with thinner thickness can be obtained.
In the molding process of the above case 4, the film material is a material suitable for electroplating. For the film material suitable for film sticking, the molding method of the above case 2 or 6 may be adopted. In the molding process of the above case 2, it is necessary to attach the optical film layer 003 to the surface of the first lens layer 001, and then mold the second lens layer 002 with the attached glass lens as a substrate. The glass lens is used as a substrate for injection molding, and the glass substrate can provide enough strength, so that the injection molding yield and the quality of the composite lens are improved. Similarly, the molding thickness of the second lens layer 002 can be made thinner, and the optical module can be made thinner.
In the molding process of the above case 6, the difference from the case 2 is that after the optical film layer 003 is molded separately, the optical film layer 003 is placed into the injection molding cavity, the second lens layer 002 is injection molded on the surface of the optical film layer 003, and finally the composite optical film layer 003 and the second lens layer 002 are glued on the first lens layer 001.
In a preferred embodiment, the combined optical surface of the first lens layer 001, and the second lens layer 002 with respect to the optical film layer 003 comprises at least one of the following:
the combined optical surface between the first lens layer 001 and the second lens layer 002 is arranged in a plane;
the combined optical surfaces between the first lens layer 001 and the second lens layer 002 are arranged as arc surfaces, and the specific arc surfaces can be concave surfaces and/or convex surfaces.
It can be appreciated that when the combined optical surfaces between the first lens layer 001 and the second lens layer 002 are arranged in a plane, the optical film layer 003 is glued to the first lens layer 001 or the second lens layer 002, and the flat-attached optical film has lower process difficulty and lower production cost compared with curved-attached optical films.
When the combined optical surface between the first lens layer 001 and the second lens layer 002 is arranged in a cambered surface, compared with the combined optical surface arranged in a plane, the cambered surface has a converging or diverging function for light transmission, and the optical design is equivalent to adding an optical design surface for optimizing an optical path, so that the imaging quality can be improved in a limited module space; in addition, the first lens layer 001 and the second lens layer 002 are in concave-convex surface matching, so that the structural reliability of the compound lens 01 is also higher.
In a preferred embodiment, the optical surface of the side of the first lens layer 001 near the optical film layer 003 is spherical; the optical surface of the side of the second lens layer 002 away from the optical film layer 003 is aspheric or free-form. In other embodiments, the optical surface of the first lens layer 001 near the optical film layer 003 may be aspheric.
The first lens layer is made of glass, and the optical surface of the first lens layer is designed to be spherical, so that the molding difficulty and cost can be greatly reduced, and the aspheric surface design brings more degrees of freedom to the light path design although the cost is increased, and is beneficial to improving the optical performance.
Because the second lens layer is made of resin materials, the second lens layer is easier to form a specific aspheric surface shape through injection molding, the degree of freedom of optical design is increased, and the application of the second lens layer in an optical module can be beneficial to improving optical performance.
Further, the diameters of the first lens layer 001 and the second lens layer 002 are D1 and D2, respectively, and the diameters of the optical film layer 003 are D3, respectively, and the following relational expressions are satisfied for D1, D2, and D3: d3 < D1 and D3 < D2. Preferably, the d1=d2, and D1 and D3 satisfy the following relation: D1-D3.ltoreq.2 mm, more preferably, D1 and D3 satisfy the following relation: D1-D3 is less than or equal to 1mm.
It can be appreciated that when the compound lens is applied to the optical module, the diameter of the optical film layer 003 is reduced, so that the diameter of the optical film layer 003 is smaller than that of the first lens layer 001 and the second lens layer 002, the optical imaging of the optical module is not affected, and only the middle region of the optical film is used for effective optical imaging. Because the optical film is smaller than the first lens layer and the second lens layer by one circle, in the resin injection molding process of the second lens layer, the second lens layer can cover the periphery of the optical film, namely, most of the second lens layer covers the surface of the optical film, and the outer ring of the second lens layer covers the surface of the glass lens, so that the stability of the composite lens can be improved.
Example 2
As shown in fig. 5 or 6, the present embodiment provides an optical module including a display screen 021, a first retardation layer 022, a partially transmissive and partially reflective layer 023, a second retardation layer 024, a reflective polarizing layer 025 and the above-mentioned compound lens 01; the display screen 021, the first phase retardation layer 022, the partially transmissive partially reflective layer 023, the second phase retardation layer 024, and the reflective polarizing layer 025 are provided in this order.
The optical film layer 003 disposed in the compound lens 01 is any one or more of a first retardation layer 022, a partially transmissive partially reflective layer 023, a second retardation layer 024, and a reflective polarizing layer 025 of the optical module, and the position of the compound lens 01 corresponds to the position of the optical film layer 003.
In this embodiment, the partially transmissive and partially reflective layer is preferably a transflective layer, and the first and second retardation layers are preferably quarter wave plates.
Specifically, the structure of the optical module includes at least one of the following:
as shown in fig. 5, the optical module of the present embodiment includes a display screen 021, a first phase retardation layer 022, a second phase retardation layer 024, a reflective polarizing layer 025 and a compound lens 01, wherein an optical film 003 in the compound lens 01 is a partially transmissive and partially reflective layer 023; specifically, a first phase retardation layer 022, a compound lens 01, a second phase retardation layer 024, and a reflective polarizing layer 025, which are sequentially disposed along the light-emitting direction of the display screen 021; the display light beam emitted from the display screen 021 sequentially passes through the first phase retardation layer 022, the compound lens 01, the second phase retardation layer 024 and the reflective polarizing layer 025 and then enters the human eye.
In this embodiment, the optical module may be a single lens module, i.e. only one compound lens 01 is disposed, and the first phase retardation layer 022, the second phase retardation layer 024 and the reflective polarizing layer 025 may be disposed on two optical surfaces outside the compound lens respectively, or may form a compound film with the partially transmissive and partially reflective layer 023 and be disposed in an interlayer of the compound lens 01. In other embodiments, the optical module may be a multi-lens module, that is, another common lens or a compound lens may be added on the basis of providing one compound lens 01, and the first phase retardation layer 022, the second phase retardation layer 024 and the reflective polarizing layer 025 may be provided on the optical surface of the other lens.
As shown in fig. 6, in another preferred embodiment, the optical module includes a display screen 021, a first retardation layer 022, a second retardation layer 024, a partially transmissive partially reflective layer 023 and a compound lens 01, wherein an optical film 003 in the compound lens 01 is a reflective polarizing layer 025; specifically, a first phase retardation layer 022, a partially transmissive partially reflective layer 023, a second phase retardation layer 024, and a compound lens 01 are sequentially disposed along the light-emitting direction of the display screen 021; the display light beam emitted by the display screen 021 sequentially passes through the first phase delay layer 022, the partial transmission and partial reflection layer 023, the second phase delay layer 024 and the compound lens 01 and then enters human eyes; wherein the first lens layer 001 of the compound lens 01 is arranged close to the human eye.
Similarly, in the present embodiment, the optical module may be a single lens module or a multi-lens module. The single lens module is to set only one compound lens, and the first phase retardation layer 022, the second phase retardation layer 024 and the partial transmission and partial reflection layer 023 can be set on two optical surfaces outside the compound lens 01, or can be a composite film formed by compositing reflection type polarization layers and set in an interlayer of the compound lens 01. When the optical module is a multi-lens module, the first phase retardation layer 022, the second phase retardation layer 024, and the partially transmissive and partially reflective layer 023 can also be disposed on the optical surface of another common lens.
In other embodiments, the optical film layer 003 in the sandwich structure of the compound lens 01 of the optical module may be a phase retardation layer or an anti-reflection layer, as can be seen in conjunction with fig. 10.
In the application, the optical module adopts a pancake folded light path design and is applied to VR and MR products. The compound lens in embodiment 1 can be applied to an optical module to improve optical performance.
In table 1 below, a lens data table of an optical module without using a compound lens is shown, and fig. 7 is a light path design diagram of a corresponding optical module, which is a folded light path design of three lenses. The thickness of the optical module is 24.24mm, and the thickness of the optical module refers to the distance between the first optical surface close to the human eye and the display screen.
As can be seen from fig. 8, the vertical chromatic aberration of the optical module is less than 10um. As can be seen in conjunction with the MTF graph of fig. 9, the spatial frequency is at 70lp/mm and the central field of view of the optical module is less than 0.4.
Table 1: lens data table of optical module without composite lens
In table 2 below, a lens data table of an optical module employing a compound lens is shown, and fig. 10 is a light path design diagram of a corresponding optical module, which is also a folded light path design of three lenses, wherein the lens located in the middle is a compound lens. The thickness of the optical module is 24.24mm, which is consistent with the thickness of the existing optical module which does not adopt the compound lens.
As can be seen from fig. 11, the vertical chromatic aberration of the optical module is less than 7um. As can be seen in conjunction with the MTF graph of fig. 12, the spatial frequency of the optical module is at 70lp/mm with a center field of view greater than 0.55. Obviously, the optical module adopting the compound lens has higher imaging definition and effectively improves imaging quality compared with the optical module not adopting the compound lens under the condition that the thickness of the module is kept consistent, and the chromatic aberration phenomenon can be obviously reduced by adopting the compound lens scheme.
Table 2 lens data table of optical module using compound lens
In the present embodiment, the thickness H1 of the first lens layer 001 is 2.99mm, the thickness H2 of the second lens layer 002 is 1.46mm, and h2/h1=0.49. The object plane size of the screen is 43.2×43.2mm, and the field angle of the optical module is 100 °.
In table 3 below, a lens data table of another optical module employing a compound lens is shown, and fig. 13 is a light path design diagram of the corresponding optical module, which is also a folded light path design of three lenses, wherein the lens located in the middle is a compound lens.
Table 3 lens data table of another optical module using compound lens
In the present embodiment, the thickness H1 of the first lens layer 001 is 3mm, the thickness H2 of the second lens layer 002 is 2.5mm, and h2/h1=0.83. The object plane size of the screen is 43.2×43.2mm, and the field angle of the optical module is 100 °.
As can be seen in conjunction with the MTF graph of fig. 14, the optical module to which the compound lens 01 is applied has a central field of view close to 0.5 at a spatial frequency of 70 lp/mm.
In table 4 below, a lens data table of another optical module using a compound lens is shown, and fig. 15 is a light path design diagram of the corresponding optical module, which is also a folded light path design of three lenses, wherein the lens located in the middle is the compound lens.
Table 4 lens data table of another optical module using compound lens
In the present embodiment, the thickness H1 of the first lens layer 001 is 6.12mm, the thickness H2 of the second lens layer 002 is 3.5mm, and h2/h1=1.75. The object plane size of the screen is 43.2×43.2mm, and the field angle of the optical module is 100 °.
As can be seen in conjunction with the MTF graph of fig. 16, the optical module to which the compound lens 01 is applied has a central field of view approaching 0.45 at a spatial frequency of 70 lp/mm.
In this embodiment, the thickness H1 of the first lens layer 001 refers to the center thickness of the first lens layer 001 along the optical axis direction thereof, and the thickness H2 of the second lens layer 002 refers to the center thickness of the second lens layer 002 along the optical axis direction thereof. The thickness H1 and the thickness H2 satisfy the following relation: H2/H1 is more than or equal to 0.1 and less than or equal to 2.
Preferably, the thickness H1 and the thickness H2 satisfy the following relation: H2/H1 is more than or equal to 0.1 and less than or equal to 1.
More preferably, the thickness H1 and the thickness H2 satisfy the following relation: H2/H1 is more than or equal to 0.1 and less than or equal to 0.6.
In summary, when the optical module uses the display screen 021 with the same size and obtains the same viewing angle, the optical performance of the optical module is better when the thickness ratio of the thickness H1 to the thickness H2 is between 0.1 and 0.6.
In addition, for the molding process, when the second lens layer 002 is compounded with the first lens layer 001 by injection molding, the thinner second lens layer 002 has lower requirements on the molding process, and the molded compound lens has higher structural stability and more stable optical performance.
In this application, the center thickness H0 of the compound lens 01 in the optical axis direction thereof satisfies the following condition: h0 is more than or equal to 1mm and less than or equal to 20mm. In one embodiment, the composite lens may be an ultrathin lens, and the thicknesses of the first lens layer 001 and the second lens layer 002 are respectively approximately 0.5mm and 0.5mm, and the thickness of the center of the first lens layer 001 and the second lens layer 002 after being combined with the optical film layer 003 is as thin as 1mm, so that the optical module is lighter and thinner.
In addition, the compound lens can also be a thick lens, and the thickness of the center of the compound lens along the optical axis reaches 20mm. The composite lens may include two lens layers including one glass lens and one resin lens, and may further include three or more lens layers including at least one glass lens and at least one resin lens. In one embodiment, taking a compound lens with three lens layers as an example, the compound lens may be composed of one glass lens and two resin lenses, the glass lens is located in the middle, the resin lenses are located at two sides of the glass lens, in one design, the central thickness of the glass lens along the optical axis direction is approximately 8mm, the central thicknesses of the two resin lenses along the optical axis direction are respectively approximately 6mm, and the thickness of the whole compound lens is 20mm.
Preferably, the H0 satisfies the following condition: h0 is more than or equal to 3mm and less than or equal to 10mm. The composite lens with the thickness of 3mm is adopted, and in the forming process, the forming process is simpler and the processing cost is lower. The compound lens with the thickness of 10mm is adopted, so that the degree of freedom of the surface type design of the compound lens is higher in the optical design, and meanwhile, the optical module can be lighter and thinner.
Further, in a preferred embodiment, a partially transmissive partially reflective layer 023 is provided on the aspherical surface of the second lens layer 002.
It can be understood that the effect of disposing the partially transmissive and partially reflective layer 023 on the aspherical surface of the second lens layer 002 is that, in the folded optical path, the reflection of the partially transmissive and partially reflective layer 023 contributes more to the optical power of the optical module, and the disposition of the partially transmissive and partially reflective layer 023 on the aspherical surface has a higher degree of freedom in designing the optical path, so that the imaging quality can be improved better by designing the aspherical surface.
In an alternative embodiment of the present application, the first lens layer 001 of the compound lens 01 is disposed near one side of the human eye, and the second lens layer 002 of the compound lens 01 is disposed near one side of the display screen 021.
It can be understood that the glass of the first lens layer 001 is used as an appearance surface, so that the structural strength is higher, the wear resistance and the corrosion resistance are stronger, and the service life of the optical module can be effectively prolonged.
Example 3
As shown in fig. 17, the present application provides a head-mounted display device, in which an optical module 02 is disposed in the head-mounted display device 03, and the optical module is any one of the optical modules in the second aspect.
Example 4
The application also provides a virtual display system, which comprises an external controller and the head-mounted display device 03 in the third aspect, wherein the external controller is connected with the head-mounted display device, and the external controller can be a handle.
The specific implementation manner of the electronic device in the embodiment of the present application may refer to each embodiment of the optical module, so at least the technical solution of the foregoing embodiment has all the beneficial effects, which are not described herein in detail.
The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.
Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (15)
1. The composite lens is characterized by comprising a first lens layer made of a glass material and a second lens layer made of a resin material, wherein an optical film layer is arranged between the first lens layer and the second lens layer, and the first lens layer, the optical film layer and the second lens layer are mutually attached; the optical film layer is one or more of a beam splitting layer, a phase delay layer, an anti-reflection layer and a polarization layer.
2. The compound lens of claim 1, wherein: the optical film layer is attached to the surface of the first lens layer or the surface of the second lens layer in a gluing or coating mode.
3. The compound lens of claim 1, wherein: the second lens layer is attached to the surface of the optical film layer in a gluing or injection molding mode.
4. The compound lens of claim 1, wherein: the first lens layer, the optical film layer and the second lens layer are mutually attached in a mode of at least one of the following:
the optical film layer is glued on the surface of the first lens layer, and the second lens layer is glued on the surface of the optical film layer;
the optical film layer is glued to the surface of the first lens layer, and the surface of the optical film layer is subjected to injection molding to obtain the second lens layer;
The surface of the first lens layer is coated with a film to obtain the optical film layer, and the second lens layer is glued on the surface of the optical film layer;
the surface of the first lens layer is coated with a film to obtain the optical film layer, and the surface of the optical film layer is injection molded to obtain the second lens layer;
the surface of the second lens layer is coated with a film to obtain the optical film layer, and the first lens layer is glued on the surface of the optical film layer;
and the surface of the optical film layer is subjected to injection molding to obtain a second lens layer, and the first lens layer is glued on the surface of the optical film layer.
5. The compound lens of claim 1, wherein: the combined optical surface of the first lens layer and the second lens layer with respect to the optical film layer satisfies at least one of:
the combined optical surface between the first lens layer and the second lens layer is arranged in a plane;
the combined optical surface between the first lens layer and the second lens layer is arranged in a cambered surface.
6. The compound lens of claim 1, wherein: the optical surface of one side of the first lens layer, which is close to the optical film layer, is spherically arranged;
the optical surface of one side of the second lens layer far away from the optical film layer is provided with an aspheric surface or a free curved surface.
7. The compound lens of claim 1, wherein: the center thickness of the first lens layer along the optical axis direction is set as H1, the center thickness of the second lens layer along the optical axis direction is set as H2, and the H1 and H2 satisfy the following relation: H2/H1 is more than or equal to 0.1 and less than or equal to 2.
8. The compound lens of claim 7, wherein: the H1 and H2 satisfy the following relation: H2/H1 is more than or equal to 0.1 and less than or equal to 1.
9. The compound lens of claim 8, wherein: the H1 and H2 satisfy the following relation: H2/H1 is more than or equal to 0.1 and less than or equal to 0.6.
10. The compound lens of claim 1, wherein: let the diameter of first lens layer be D1 respectively, the diameter of second lens layer be D2, the diameter of optical film layer be D3, D1, D2, D3 satisfy following relational expression: d3 < D1 and D3 < D2.
11. An optical module, characterized in that: a composite lens according to any one of claims 1 to 9 comprising a display screen, a first phase retardation layer, a partially transmissive partially reflective layer, a second phase retardation layer, a reflective polarizing layer; the display screen, the first phase delay layer, the partial transmission partial reflection layer, the second phase delay layer and the reflection polarization layer are sequentially arranged;
The optical film layer arranged in the composite lens is any one or more of a first phase delay layer, a partial transmission partial reflection layer, a second phase delay layer and a reflection polarization layer of the optical module, and the position of the composite lens corresponds to the position of the optical film layer.
12. The optical module of claim 11, wherein: the partial transmission partial reflection layer is arranged on the optical surface, far away from the first lens layer, of the second lens layer, and the optical surface, far away from the first lens layer, of the second lens layer is an aspheric surface or a free-form surface.
13. An optical module according to claim 11 or 12, characterized in that: the first lens layer of the compound lens is arranged close to one side of a human eye, and the second lens layer of the compound lens is arranged close to one side of the display screen.
14. A head mounted display device, characterized by: an optical module is configured in the head-mounted display device, and the optical module is an optical module according to any one of claims 11-13.
15. A virtual display system, characterized by: the virtual display system comprises an external controller and the head-mounted display device described in claim 14, wherein the external controller is connected with the head-mounted display device.
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| CN101019044A (en) * | 2005-05-13 | 2007-08-15 | 三洋电机株式会社 | Multilayer optical device |
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| CN218003854U (en) * | 2022-06-30 | 2022-12-09 | 歌尔光学科技有限公司 | Optical module and head-mounted display equipment |
| CN117666147A (en) * | 2023-12-07 | 2024-03-08 | 广州纳立多科技有限公司 | Compound optical module, wearable equipment and VR system |
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| CN101019044A (en) * | 2005-05-13 | 2007-08-15 | 三洋电机株式会社 | Multilayer optical device |
| CN106501955A (en) * | 2015-09-03 | 2017-03-15 | 3M创新有限公司 | Amplifying device |
| US20170068095A1 (en) * | 2015-09-04 | 2017-03-09 | Thalmic Labs Inc. | Systems, articles, and methods for integrating holographic optical elements with eyeglass lenses |
| CN218003854U (en) * | 2022-06-30 | 2022-12-09 | 歌尔光学科技有限公司 | Optical module and head-mounted display equipment |
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