Laminated mirror group, optical module and head-mounted display device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GOERTEK OPTICAL TECH CO LTD
- Filing Date
- 2023-05-31
- Publication Date
- 2026-07-21
AI Technical Summary
The low optical axis alignment accuracy of existing cemented lenses leads to high processing costs and low efficiency.
A positioning structure, including an eccentric positioning post and an inclined positioning hole, is introduced between the lenses of the cemented lens to limit the movement and rotation of the lens in the XY plane and to limit it in the Z direction, ensuring the optical axis alignment accuracy.
High-precision optical axis alignment was achieved, reducing processing costs and improving the yield of cemented lens assemblies.
Smart Images
Figure CN116679415B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical technology, and more specifically, to a cemented lens assembly, an optical module, and a head-mounted display device. Background Technology
[0002] Cemented lenses are required in some optical path architectures. They can reduce the size of optical modules, for example, in the thickness direction, and more importantly, eliminate chromatic aberration. However, the production of cemented lenses suffers from low alignment accuracy between the two lenses, which significantly affects their optical performance. Currently, one method in cemented lens processing is to use specialized equipment to align the optical axes of the two lenses, which is not only costly but also inefficient. Another method is CCD imaging alignment, but this has the disadvantages of large errors in CCD equipment and high precision requirements for lens injection molding, making it difficult to achieve the required optical axis alignment accuracy. Summary of the Invention
[0003] The purpose of this application is to provide a new technical solution for a cemented lens assembly, an optical module, and a head-mounted display device, which solves the problem of low optical axis alignment accuracy between different lenses in the existing cemented lens assembly manufacturing process.
[0004] In a first aspect, this application provides a cemented lens assembly. The cemented lens assembly includes at least a first lens and a second lens, wherein an adhesive layer is formed between the first lens and the second lens;
[0005] The first lens and the second lens are also aligned and fitted together by a positioning structure so that the optical axis of the first lens and the optical axis of the second lens can coincide; wherein, the positioning structure includes a first positioning component and a second positioning component, the first positioning component is used to restrict the movement or rotation of the first lens and the second lens in the XY plane, and the second positioning component is used to limit the first lens and the second lens in the Z direction.
[0006] Optionally, the first positioning component includes an eccentric positioning post and an eccentric positioning hole, and the eccentric positioning post and the eccentric positioning hole are configured in a one-to-one correspondence.
[0007] One of the eccentric positioning post and the eccentric positioning hole is located outside the optically effective area of the first lens, and the other of the eccentric positioning post and the eccentric positioning hole is located outside the optically effective area of the second lens.
[0008] Optionally, at least two eccentric positioning posts and at least two eccentric positioning holes are provided; wherein, the at least two eccentric positioning holes include a circular hole and a runway-shaped hole, and the circular hole and the runway-shaped hole are arranged opposite to each other.
[0009] Optionally, the depth of the eccentric positioning hole is greater than the height of the eccentric positioning post; when the eccentric positioning post is inserted into the corresponding eccentric positioning hole, a target gap is formed between the eccentric positioning post and the eccentric positioning hole in the Z direction.
[0010] Optionally, the second positioning component includes an inclined positioning post and an inclined positioning hole, and the inclined positioning post and the inclined positioning hole are configured in a one-to-one correspondence.
[0011] One of the tilted positioning post and the tilted positioning hole is located outside the optically effective area of the first lens, and the other of the tilted positioning post and the tilted positioning hole is located outside the optically effective area of the second lens.
[0012] Optionally, at least one inclined positioning post and at least one inclined positioning hole are provided to control the inclination of the optical axis of the first lens relative to the optical axis of the second lens; each inclined positioning post can be inserted into the corresponding inclined positioning hole, and the insertion end of the inclined positioning post abuts against the bottom wall of the inclined positioning hole.
[0013] Optionally, the first positioning component and the second positioning component are circumferentially offset on the side where the first lens and the second lens are glued together.
[0014] Optionally, the two surfaces on which the first lens and the second lens are bonded together are a first surface and a second surface, respectively, and the adhesive layer is located between the optically effective area of the first surface and the optically effective area of the second surface.
[0015] Secondly, this application provides an optical module, the optical module comprising:
[0016] As described in the first aspect, the cemented lens assembly.
[0017] Thirdly, this application provides a head-mounted display device. The head-mounted display device includes:
[0018] The outer casing; and
[0019] The optical module as described in the second aspect.
[0020] The beneficial effects of this application are as follows:
[0021] According to an embodiment of this application, a cemented lens assembly can control the eccentricity and tilt of the two cemented lenses by adding a positioning structure between them. This allows for the achievement of the optical axis alignment accuracy requirements of the two cemented lenses. Furthermore, it features a simple alignment method, low cost, and high alignment accuracy, thereby improving the processing yield of the cemented lens assembly.
[0022] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description
[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.
[0024] Figure 1 This is one of the structural schematic diagrams of the cemented lens assembly provided in the embodiments of this application;
[0025] Figure 2 This is a schematic diagram of the structure of the first lens provided in an embodiment of this application;
[0026] Figure 3 This is a schematic diagram of the structure of the second lens provided in an embodiment of this application;
[0027] Figure 4 This is a second schematic diagram of the structure of the cemented lens assembly provided in the embodiments of this application;
[0028] Figure 5 for Figure 4 Enlarged view of point A in the middle;
[0029] Figure 6 for Figure 4 Enlarged view of point B in the middle;
[0030] Figure 7 This is the third schematic diagram of the structure of the cemented lens assembly provided in the embodiments of this application;
[0031] Figure 8 for Figure 7 Enlarged view of point C in the middle.
[0032] Figure label:
[0033] 1. First lens; 11. First surface; 2. Second lens; 21. Second surface; 3. Adhesive layer; 4. Eccentric positioning post; 5. Eccentric positioning hole; 6. Inclined positioning post; 7. Inclined positioning hole; 8. First optical film; 9. Second optical film. Detailed Implementation
[0034] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.
[0036] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.
[0037] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0039] The adhesive lens assembly, optical module, and head-mounted display device provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0040] According to one embodiment of this application, a cemented lens assembly is provided that can be used in various optical modules. For example, the cemented lens assembly can be used in a direct-view optical architecture, and of course, it can also be used in a folding optical architecture. The cemented lens assembly can, for example, be used to eliminate chromatic aberration.
[0041] It should be noted that the key point of the technical solution provided in this application embodiment lies in the positioning and mating part between the two lenses, that is, the design of the edge parts of the two cemented lenses. The instruction manual for the cemented lens assembly provided in this application embodiment is attached. Figure 1 , Figure 4 and Figure 7 The lens surface design is hidden in the middle.
[0042] According to the cemented lens assembly provided in the embodiments of this application, see [link to relevant documentation]. Figures 1 to 3 The cemented lens assembly includes at least a first lens 1 and a second lens 2, with an adhesive layer 3 formed between the first lens 1 and the second lens 2. Furthermore, the first lens 1 and the second lens 2 are aligned via a positioning structure to ensure that the optical axes of the first lens 1 and the second lens 2 coincide. The positioning structure includes a first positioning component and a second positioning component. The first positioning component restricts the movement or rotation of the first lens 1 and the second lens 2 in the XY plane, and the second positioning component limits the position of the first lens 1 and the second lens 2 in the Z direction.
[0043] According to the cemented lens assembly provided in the above embodiments of this application, by adding a positioning structure between the cemented first lens 1 and the second lens 2, the eccentricity and tilt of the two cemented lenses can be controlled, thereby achieving the alignment accuracy requirements of the optical axes of the first lens 1 and the second lens 2, so that the optical axis of the first lens 1 and the optical axis of the second lens 2 can coincide.
[0044] The positioning structure added in this embodiment can simplify the alignment of the first lens 1 and the second lens 2 during bonding, achieve high alignment accuracy and low cost, and improve the yield of bonded lens assemblies.
[0045] The first lens 1 and the second lens 2 are, for example, plastic lenses.
[0046] The first lens 1 and the second lens 2 can be formed by injection molding. The optical axis alignment method provided in this application embodiment has low requirements for the injection molding precision of the first lens 1 and the second lens 2, effectively overcoming the defects caused by CCD imaging alignment. Traditional CCD imaging alignment methods have very high requirements for the injection molding precision of the cemented lenses.
[0047] According to the embodiments described above, the positioning structure includes a first positioning component and a second positioning component. These components can achieve cementing alignment between the first lens 1 and the second lens 2 in different directions, ensuring that the cemented first lens 1 and second lens 2 have their optical axes coincident. Specifically, the first positioning component restricts the movement or rotation of the first lens 1 and the second lens 2 in the XY plane, preventing eccentricity between them. The second positioning component limits the first lens 1 and the second lens 2 in the Z direction, preventing relative tilt and ensuring flatness, thus enabling precise control of the lens tilt angle.
[0048] It should be noted that the cemented lens assembly provided in the embodiments of this application includes, but is not limited to, the cementation of two lenses, and may also include the cementation of three or more lenses. The same applies to the scheme of this application. The number of cemented lenses is not limited in this application.
[0049] Optionally, see Figure 1 A first optical film 8 may be added between the first lens 1 and the adhesive layer 3, and / or a second optical film may be added between the second lens 2 and the adhesive layer 3. This allows the cemented lens assembly to possess other optical properties or improve existing optical properties. This application does not limit the type or quantity of optical films introduced.
[0050] See some examples in this application. Figure 2 and Figure 3 The first positioning component includes an eccentric positioning post 4 and an eccentric positioning hole 5, and the eccentric positioning post 4 and the eccentric positioning hole 5 are arranged in a one-to-one correspondence. One of the eccentric positioning post 4 and the eccentric positioning hole 5 is located outside the optically effective area on the first lens 1, and the other of the eccentric positioning post 4 and the eccentric positioning hole 5 is located outside the optically effective area on the second lens 2.
[0051] Based on the example above, see Figure 2 and Figure 3 An eccentric positioning post 4 can be provided on the first lens 1 in the cemented lens assembly. At this time, an eccentric positioning hole 5 needs to be provided on the second lens 2. In this way, the eccentricity of the cemented first lens 1 and the second lens 2 can be controlled by the engagement of the eccentric positioning post 4 and the eccentric positioning hole 5.
[0052] It should be noted that when an eccentric positioning hole 5 is provided on the first lens 1, an eccentric positioning post 4 is provided on the second lens 2.
[0053] According to the above example, the eccentric positioning post 4 and the eccentric positioning hole 5 are respectively disposed on the first lens 1 and the second lens 2, and are both located outside the optical effective area of the corresponding lens, that is, on the edge area of the lens. This design will not affect the optical performance of the lens.
[0054] In some examples of this application, the eccentric positioning post 4 and the eccentric positioning hole 5 are respectively set to at least two; wherein, the at least two eccentric positioning holes 5 include a circular hole and a racetrack-shaped hole, and the circular hole and the racetrack-shaped hole are arranged opposite to each other.
[0055] In order to control the eccentricity of the first lens 1 and the second lens 2 during bonding, the eccentric positioning post 4 needs to be set to two or more, so as to effectively prevent the first lens 1 and the second lens 2 from moving or rotating relative to each other during bonding.
[0056] Since each eccentric positioning post 4 is inserted into a corresponding eccentric positioning hole 5, the number of eccentric positioning holes 5 should be consistent with the number of eccentric positioning posts 4.
[0057] In one example, two eccentric positioning posts 4 are provided, and each eccentric positioning post 4 is cylindrical. In this case, two corresponding eccentric positioning holes 5 are provided. See [link / reference needed]. Figure 3One of the eccentric positioning holes 5 is a circular hole, while the other eccentric positioning hole 5 is designed as a racetrack-shaped hole. These two eccentric positioning holes 5 are positioned opposite each other on the same straight line, which better restricts the movement and rotation of the glued first lens 1 and second lens 2 in the XY plane. Furthermore, the introduction of the racetrack-shaped hole prevents the eccentric positioning post 4 from being overly constrained during assembly, thus avoiding assembly difficulties.
[0058] See some examples in this application. Figures 4 to 6 The depth of the eccentric positioning hole 5 is greater than the height of the eccentric positioning post 4. When the eccentric positioning post 4 is inserted into the corresponding eccentric positioning hole 5, a target gap is formed between the eccentric positioning post 4 and the eccentric positioning hole 5 in the Z direction.
[0059] See Figure 5 and Figure 6 In the Z direction, the eccentric positioning post 4 and the corresponding eccentric positioning hole 5 have a large gap, and it is not used for Z-direction positioning.
[0060] For some examples in this application, please continue to see Figure 2 and Figure 3 The second positioning component includes an inclined positioning post 6 and an inclined positioning hole 7, and the inclined positioning post 6 and the inclined positioning hole 7 are arranged in a one-to-one correspondence; one of the inclined positioning post 6 and the inclined positioning hole 7 is located outside the optically effective area on the first lens 1, and the other of the inclined positioning post 6 and the inclined positioning hole 7 is located outside the optically effective area on the second lens 2.
[0061] Based on the example above, see Figure 2 and Figure 3 An inclined positioning post 6 can be provided on the first lens 1 in the cemented lens assembly. At this time, an inclined positioning hole 7 needs to be provided on the second lens 2. In this way, by engaging the inclined positioning post 6 with the inclined positioning hole 7, the tilt of the cemented first lens 1 and the second lens 2 can be controlled, thereby avoiding the optical axes of the two from forming an inclined angle.
[0062] It should be noted that when an inclined positioning hole 7 is provided on the first lens 1, an inclined positioning post 6 is provided on the second lens 2.
[0063] According to the above example, the tilted positioning post 6 and the tilted positioning hole 7 are respectively disposed on the first lens 1 and the second lens 2, and are both located outside the optical effective area of the corresponding lens, that is, on the edge area of the lens, so as not to affect the optical performance of the lens.
[0064] See some examples in this application. Figure 2 and Figure 3Each of the aforementioned tilting positioning posts 6 and tilting positioning holes 7 is provided at least one, to control the tilt of the optical axis of the first lens 1 relative to the optical axis of the second lens 2; wherein each of the tilting positioning posts 6 can be inserted into the corresponding tilting positioning hole 7, and the insertion end of the tilting positioning post 6 abuts against the bottom wall of the tilting positioning hole 7, see [reference]. Figure 7 and Figure 8 .
[0065] It should be noted that when bonding the first lens 1 and the second lens 2, if each of the eccentric positioning posts 4 is already inserted into the corresponding eccentric positioning holes 5 under the action of the first positioning component, a Z-direction positioning effect can also be formed. Based on this, only a set of mutually cooperating inclined positioning posts 6 and inclined positioning holes 7 are needed to prevent relative tilting between the first lens 1 and the second lens 2.
[0066] As a preferred example of this application, see [link to relevant documentation]. Figure 2 and Figure 3 Three tilting positioning posts 6 and three tilting positioning holes 7 are respectively provided. By controlling the flatness of the mating surfaces of these three tilting positioning posts 6 and tilting positioning holes 7, precise control of the tilt of the optical axes of the two cemented lenses can be achieved. This control method offers higher precision and can further improve the yield rate of cemented lens assemblies.
[0067] In some examples of this application, the first positioning component and the second positioning component are circumferentially offset on the side where the first lens 1 and the second lens 2 are glued together.
[0068] In this way, the first positioning component and the second positioning component will not interfere with each other.
[0069] In this application, see Figure 2 and Figure 3 By introducing the first positioning component and the second positioning component described above between the cemented first lens 1 and the second lens 2, the eccentricity and tilt control of the cemented first lens 1 and the second lens 2 can be achieved simultaneously.
[0070] See some examples in this application. Figure 4 The first lens 1 and the second lens 2 are bonded together on two surfaces, namely the first surface 11 and the second surface 21, and the adhesive layer 3 is located between the optically effective area of the first surface 11 and the optically effective area of the second surface 21.
[0071] The adhesive layer 3 can be, for example, an optical adhesive, which can stably bond the first lens 1 and the second lens 2 together without affecting the optical performance of the lenses.
[0072] The eccentric positioning hole 5 and the inclined positioning hole 7 can be designed as circular, elliptical, polygonal and other shapes, and this application does not limit them.
[0073] According to another embodiment of this application, an optical module is provided. The optical module includes a cemented lens assembly as described above.
[0074] The optical module may include one or more cemented lens assemblies, and may also include individual lenses. The use of cemented lens assemblies in the optical module can eliminate chromatic aberration.
[0075] According to another embodiment of this application, a head-mounted display device is provided. The head-mounted display device includes a housing and an optical module as described above.
[0076] The head-mounted display device includes smart glasses or smart helmets, etc., and this application embodiment does not limit this.
[0077] The specific implementation of the optical module and head-mounted display device in this application can be referred to the above-described embodiments of the laminated lens assembly. Therefore, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.
[0078] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.
[0079] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.
Claims
1. A type of cemented mirror assembly, characterized in that, It includes at least a first lens (1) and a second lens (2), with an adhesive layer (3) formed between the first lens (1) and the second lens (2); The first lens (1) and the second lens (2) are also aligned through a positioning structure so that the optical axis of the first lens (1) and the optical axis of the second lens (2) can coincide; wherein, the positioning structure includes a first positioning component and a second positioning component, the first positioning component is used to restrict the movement or rotation of the first lens (1) and the second lens (2) in the XY plane, and the second positioning component is used to limit the first lens (1) and the second lens (2) in the Z direction; The first positioning component includes an eccentric positioning post (4) and an eccentric positioning hole (5), and the eccentric positioning post (4) and the eccentric positioning hole (5) are configured in a one-to-one correspondence; One of the eccentric positioning post (4) and the eccentric positioning hole (5) is located outside the optically effective area on the first lens (1), and the other of the eccentric positioning post (4) and the eccentric positioning hole (5) is located outside the optically effective area on the second lens (2). The eccentric positioning pin (4) and the eccentric positioning hole (5) are each provided in at least two configurations; Among them, at least two of the eccentric positioning holes (5) include a circular hole and a runway-shaped hole, wherein the circular hole and the runway-shaped hole are arranged opposite to each other; The depth of the eccentric positioning hole (5) is greater than the height of the eccentric positioning post (4); When the eccentric positioning post (4) is inserted into the corresponding eccentric positioning hole (5), a target gap is formed between the eccentric positioning post (4) and the eccentric positioning hole (5) in the Z direction; The second positioning component includes an inclined positioning post (6) and an inclined positioning hole (7), and the inclined positioning post (6) and the inclined positioning hole (7) are configured in a one-to-one correspondence; One of the inclined positioning post (6) and the inclined positioning hole (7) is located outside the optically effective area on the first lens (1), and the other of the inclined positioning post (6) and the inclined positioning hole (7) is located outside the optically effective area on the second lens (2). The inclined positioning post (6) and the inclined positioning hole (7) are respectively set to at least one, so as to control the inclination of the optical axis of the first lens (1) relative to the optical axis of the second lens (2); Each of the inclined positioning pins (6) can be inserted into the corresponding inclined positioning hole (7), and the insertion end of the inclined positioning pin (6) abuts against the bottom wall of the inclined positioning hole (7).
2. The cemented mirror assembly according to claim 1, characterized in that, The first positioning component and the second positioning component are staggered circumferentially on the side where the first lens (1) and the second lens (2) are glued together.
3. The cemented mirror assembly according to claim 1, characterized in that, The first lens (1) and the second lens (2) are bonded together on two surfaces, namely the first surface (11) and the second surface (21), and the adhesive layer (3) is located between the optically effective area of the first surface (11) and the optically effective area of the second surface (21).
4. An optical module, characterized in that, include: The cemented mirror assembly as described in any one of claims 1-3.
5. A head-mounted display device, characterized in that, include: shell; as well as, The optical module as described in claim 4.