Mold for waveguide lens and waveguide lens
Through the multi-mold process, the grating structure of the lens is integrated, and the problem of large lens thickness of existing augmented reality equipment is solved, and the lens thickness is reduced and the production efficiency is improved.
Patent Information
- Application Number
- CN202420410781.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-03-04
AI Technical Summary
The large thickness of lenses used in existing augmented reality devices leads to technical challenges.
By adopting a multi-mold process, the grating structure is pre-processed on the second mold and the second mold is integrated into the lens when the first mold is clamped with the second mold, and then the grating structure is clamped with the first mold. When forming the second lens on the lens surface, the thickness of the entire lens is reduced.
Without the need for a gluing process, the thickness of the waveguide lens is reduced and the thinness and production efficiency of the lens are improved.
Smart Images
Figure CN222346098U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of waveguide lens processing, and in particular to a mold for a waveguide lens and a waveguide lens. Background Art
[0002] Most of the lenses used in augmented reality devices are made by processing a grating structure on a waveguide substrate, and then gluing the waveguide substrate to the eyepiece and objective lens, resulting in a larger thickness of the entire lens. Utility Model Content
[0003] The present application provides a mold for a waveguide lens and a waveguide lens to solve the problem of thick lenses used in augmented reality devices in the known technology.
[0004] In a first aspect, the present application provides a mold for a waveguide lens, comprising a first mold, a second mold and a third mold, wherein a first groove is provided on one side of the first mold for molding a first lens; the second mold is used to be molded with the first mold, and the second mold has a first surface on the side facing the first mold, and the first surface is provided with a first grating structure, and the first surface closes the first groove, and the first grating structure extends into the first groove or is connected to the first groove, and is used to integrally mold a second grating structure on the first lens; the third mold is used to be molded with the first mold, and a second groove is provided on one side of the third mold, and the second groove is used to mold a second lens on the surface of the first lens.
[0005] In a possible implementation, the first grating structure has a groove structure recessed in the first surface, and the groove structure is connected to the first groove body, so that the second grating structure is convexly provided on the first lens.
[0006] In a possible implementation, the first grating structure further includes a plurality of grating protrusions, the plurality of grating protrusions are disposed in the groove structure, the plurality of grating protrusions are arranged at intervals, and a sub-groove is formed between any two adjacent grating protrusions, and the sub-groove is connected to the first groove body.
[0007] In a possible implementation manner, the protrusion length of the grating protrusion is the same as the depth of the groove structure.
[0008] In a possible implementation, the first surface is located on a side of the second mold close to the first mold, and the first grating structure is a protruding structure convexly provided on the first surface and extending into the first groove body, so that the second grating structure is concavely provided on the first lens.
[0009] In a possible implementation, the second groove body is connected to the second grating structure so as to integrally form a third grating structure on the second lens.
[0010] In a possible implementation, the first lens has a second surface, the second surface is provided with the second grating structure, and the outer diameter of the second surface is not less than the diameter of the second groove body.
[0011] In a possible implementation manner, the first grating structure is provided in plurality, and the plurality of first grating structures are provided on the first surface at intervals along the radial direction of the second mold.
[0012] In a second aspect, an embodiment of the present application further provides a waveguide lens, which is made using the above-mentioned mold for a waveguide lens, and includes a grating structure, and a first lens and a second lens stacked together, wherein the first lens and the second lens are integrally formed, and the grating structure is located between the first lens and the second lens, and is integrally formed with the first lens and the second lens.
[0013] In a possible implementation, the waveguide lens further includes a third lens, and the third lens is located between the first lens and the second lens and is integrally formed with the first lens and the second lens.
[0014] The mold for the waveguide lens of the present application pre-processes the first grating structure on the second mold, and when the second mold and the first mold are molded together to process the first lens, the second grating structure is directly integrally molded on the first lens, and the second lens is directly integrally molded on the surface of the molded first lens after the third mold is molded together with the first mold, so that the final waveguide lens does not need to adopt a gluing process, thereby reducing the thickness of the entire waveguide lens. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic structural diagram of the first mold and the second mold of the mold for the waveguide lens in Example 1 of the present application.
[0016] Figure 2 This is a schematic structural diagram of the first mold and the third mold of the mold for the waveguide lens in Example 1 of the present application.
[0017] Figure 3 This is a schematic structural diagram of a first mold and a second mold of a mold for a waveguide lens in Example 2 of the present application.
[0018] Figure 4 This is a schematic structural diagram of the first mold and the third mold of the mold for the waveguide lens in Example 2 of the present application.
[0019] Figure 5 This is a schematic structural diagram of a waveguide lens of the present application being prepared and formed using the mold for waveguide lens in Example 1.
[0020] Figure 6 This is a schematic structural diagram of a waveguide lens of the present application being prepared and formed using the mold for waveguide lens in Example 2.
[0021] Figure 7 FIG. 1 is a schematic diagram of the structural separation of the waveguide lens of the present application in another embodiment.
[0022] Description of main component symbols:
[0023] Molds 100a, 100b for waveguide lenses
[0024] Waveguide lenses 200a, 200b, 200c
[0025] First surface P1
[0026] Second surface P2
[0027] Grating structure 1
[0028] First molds 10a, 10b
[0029] First tank bodies 11a, 11b
[0030] Second molds 20a, 20b
[0031] First grating structure 30a, 30b
[0032] Groove structure 311
[0033] Grating protrusion 312
[0034] Subslot 313
[0035] Raised structure 314
[0036] Forming groove 315
[0037] Third molds 40a, 40b
[0038] Second grooves 41a, 41b
[0039] First lenses 50a, 50b
[0040] Second grating structures 60a, 60b
[0041] Projection 61
[0042] First grating protrusion 62
[0043] First grating groove 63
[0044] Second lenses 70a, 70b
[0045] The third grating structure 80
[0046] The second grating protrusion 81
[0047] The third lens 90
[0048] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0049] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.
[0050] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include the plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the existence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.
[0051] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.
[0052] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.
[0053] like Figure 1 and Figure 2 See Figure 5 , this embodiment 1 provides a mold 100a for a waveguide lens, including a first mold 10a, a second mold 20a and a third mold 40a.
[0054] A first groove 11a is provided on one side of the first mold 10a for molding a first lens 50a. The first lens 50a is used as an eyepiece or an objective lens. The first lens 50a is a spherical lens, an aspherical lens or a double aspherical lens. The shape of the first groove 11a is adapted to the shape of the first lens 50a to process the first lens 50a in a desired shape. The first lens 50a is cast and molded using optical lens materials such as cycloolefin copolymer (COC), polymethyl methacrylate (PMMA), and polycarbonate (PC). The optical refractive index thereof is 1.4 to 2.0, and the transmittance is above 90%.
[0055] The second mold 20a is used to be molded with the first mold 10a. The second mold 20a has a first surface P1 on the side facing the first mold 10a. The first surface P1 is provided with a first grating structure 30a. The first surface P1 closes the first groove 11a, so that the optical lens material is injected into the first groove 11a and the first lens 50a is formed after cooling. When the second mold 20a is molded with the first mold 10a, the first grating structure 30a extends into the first groove 11a or communicates with the first groove 11a, so as to integrally mold the second grating structure 60a on the first lens 50a.
[0056] The third mold 40a is used to be molded with the first mold 10a. A second groove 41a is provided on one side of the third mold 40a. The second groove 41a is used to mold the second lens 70a on the surface of the first lens 50a. When the third mold 40a is molded with the first mold 10a, the surface of the first lens 50a molded with the second grating structure 60a closes the second groove 41a, so that the second lens 70a is directly molded on the surface of the first lens 50a, and the second grating structure 60a is located between the first lens 50a and the second lens 70a.
[0057] The second lens 70a is used as an objective lens or an eyepiece. The second lens 70a is a spherical lens, an aspherical lens or a double aspherical lens. The shape of the second groove 41a is adapted to the shape of the second lens 70a to process the second lens 70a of a desired shape. The second lens 70a is cast and molded using optical lens materials such as cycloolefin copolymer (COC), polymethyl methacrylate (PMMA), and polycarbonate (PC). Its optical refractive index is 1.4 to 2.0, and its transmittance is above 90%.
[0058] In this way, the mold 100a for the waveguide lens of the present application pre-processes the first grating structure 30a on the second mold 20a, and when the second mold 20a and the first mold 10a are molded together to process the first lens 50a, the second grating structure 60a is directly integrally formed on the first lens 50a, and the second lens 70a is directly integrally formed on the surface of the molded first lens 50a after the third mold 40a is molded together with the first mold 10a, so that the final waveguide lens does not need to adopt a gluing process, thereby reducing the thickness of the entire waveguide lens.
[0059] Please combine again Figure 1 and Figure 2 , and see Figure 5 In Example 1, the first lens 50a has a second surface P2. When the first lens 50a is formed in the first groove 11a, the surface of the first lens 50a close to the second mold 20a is set as the second surface P2, and the second grating structure 60a is integrally formed on the second surface P2. The outer diameter of the second surface P2 is not less than the diameter of the second groove 41a, so as to ensure that the second surface P2 can completely close the second groove 41a and ensure the smooth casting of the second lens 70a.
[0060] The first grating structure 30a is provided in plurality, and the plurality of first grating structures 30a are provided on the first surface P1 at intervals along the radial direction of the second mold 20a. The first grating structure 30a has a groove structure 311 recessed on the first surface P1. The number of the groove structures 311 is two, and the two groove structures 311 are provided on the first surface P1 at intervals.
[0061] It is understandable that, when other embodiments are adopted, the number of the groove structure 311 can be one, and one groove structure 311 is approximately located at the center of the first surface P1. In addition, the number of the groove structure 311 can also be three or more, and three or more groove structures 311 are evenly distributed on the first surface P1 at intervals.
[0062] When the second mold 20a is molded with the first mold 10a, the groove structure 311 is connected to the first groove body 11a to jointly form a casting cavity, so that the first lens 50a is molded in the casting cavity, and when the first lens 50a is molded, the second grating structure 60a is directly integrally molded on the surface of the first lens 50a.
[0063] Furthermore, the first grating structure 30a also includes a plurality of grating protrusions 312. The plurality of grating protrusions 312 are arranged in the groove structure 311 and protrude outward from the bottom wall of the groove structure 311. The plurality of grating protrusions 312 are arranged at intervals, and a sub-groove 313 is formed between any two adjacent grating protrusions 312, and the sub-groove 313 is connected to the first groove body 11a. When the second mold 20a is molded with the first mold 10a, the plurality of sub-grooves 313 are filled with optical lens materials, so that when the first lens 50a is molded, a plurality of convex portions 61 are directly molded on the surface of the first lens 50a. The plurality of convex portions 61 are arranged corresponding to the plurality of sub-grooves 313, and the shape and size of the convex portions 61 are the same as those of the sub-grooves 313. The plurality of convex portions 61 are arranged at intervals to form the second grating structure 60a.
[0064] In particular, the protruding length of the grating protrusion 312 is the same as the depth of the groove structure 311, so that the depth of the formed sub-groove 313 is the same as the depth of the groove structure 311, and further the protrusion 61 formed after pouring the optical lens material in the sub-groove 313 is the same as the protruding length of the grating protrusion 312.
[0065] It is understandable that the convex portion 61 may be a rectangular structure, a trapezoidal structure, a columnar structure, or other structures of different shapes. The convex portion 61 may also extend perpendicularly to the surface of the first lens 50a, or the convex portion 61 may extend obliquely to the surface of the first lens 50a. A plurality of convex portions 61 may be arranged side by side at intervals in one direction, or may be arranged at intervals in the circumferential direction.
[0066] The specific shape and arrangement of the protrusions 61 can be adaptively selected according to the specific type of the second grating structure 60a. The second grating structure 60a can be a one-dimensional grating or a two-dimensional grating. Among them, the one-dimensional grating can be specifically a tilted grating, a trapezoidal grating, a rectangular grating and a blazed grating.
[0067] Please combine again Figure 3 and Figure 4 , and see Figure 6 , this embodiment 2 provides a mold 100b for a waveguide lens, including a first mold 10b, a second mold 20b and a third mold 40b. The first grating structure 30b is a protruding structure 314 protruding from the first surface P1. There are multiple protruding structures 314, and the multiple protruding structures 314 are arranged at intervals along a direction, and a molding groove 315 is formed between any two adjacent protruding structures 314. When the second mold 20b is molded with the first mold 10b, the protruding structure 314 extends into the first trough body 11b, and the multiple molding grooves 315 are connected to the first trough body 11b to form a casting cavity. When the optical lens material is injected into the above-mentioned casting cavity, a first grating protrusion 62 is formed in the molding groove 315.
[0068] The number of the first grating protrusions 62 is the same as the number of the molding grooves 315, and the structure and shape of the first grating protrusions 62 are the same as the molding grooves 315. A first grating groove 63 is formed between each of the two adjacent first grating protrusions 62, and the number, shape and structure of the first grating grooves 63 are the same as those of the protrusion structure 314. The plurality of first grating grooves 63 constitute the second grating structure 60b, so that the second grating structure 60b is concavely provided on the first lens 50b.
[0069] Please combine again Figure 3 and Figure 4 , and see Figure 6 In the second embodiment, the second groove body 41b is connected to the second grating structure 60b so as to integrally form the third grating structure 80 on the second lens 70b.
[0070] When the third mold 40b is molded with the second mold 20b, the first lens 50b is located in the first groove 11b, which is used to close the second groove 41b. The plurality of first grating grooves 63 are connected to the second groove 41b to form a casting cavity. When the optical lens material is injected into the casting cavity, the second grating protrusions 81 are formed in the first grating grooves 63, and the second lens 70b is formed in the second groove 41b, that is, the third grating structure 80 composed of the plurality of second grating protrusions 81 is integrally formed on the surface of the second lens 70b, and the second lens 70b is integrally connected to the first lens 50b.
[0071] Except for the above structure, the structures and principles of other components of Example 2 are the same as those of Example 1 and will not be described in detail.
[0072] like Figures 5 to 7 See Figure 1 The embodiment of the present application also provides a waveguide lens 200a, which is made using the above-mentioned mold 100a for waveguide lenses. The waveguide lens 200a can be in a circular, elliptical, rectangular or square shape. The waveguide lens 200a includes a grating structure 1, and a first lens 50a and a second lens 70a stacked. The first lens 50a and the second lens 70a are integrally formed, and the grating structure 1 is located between the first lens 50a and the second lens 70a, and is integrally formed with the first lens 50a and the second lens 70a.
[0073] In the waveguide lens 200a manufactured by using the mold 100a for the waveguide lens in the above-mentioned embodiment 1, its grating structure 1 is the second grating structure 60a integrally formed on the first lens 50a in embodiment 1, and light is transmitted through the second grating structure 60a.
[0074] In the waveguide lens 200 b made by using the mold for the waveguide lens in the above-mentioned embodiment 2, its grating structure 1 is the third grating structure 80 integrally formed on the second lens 70 b in embodiment 2, and light is transmitted through the third grating structure 80 .
[0075] like Figure 7 As shown, it can be understood that when other embodiments are adopted, the grating structure 1 can also include a second grating structure 60a integrally formed on the first lens 50a, and a third grating structure 80 integrally formed on the second lens 70b.
[0076] Furthermore, if Figure 7 See Figure 3 and Figure 4 The waveguide lens 200c also includes a third lens 90, which is located between the first lens 50a and the second lens 70b and is integrally formed with the first lens 50a and the second lens 70b. During processing, another mold is used to mold with the first mold 10a having the first lens 50a formed thereon to obtain the integrally formed first lens 50a and third lens 90. Subsequently, the surface of the third lens 90 away from the first lens 50a is closed with the second groove 41b of the third mold 40b, so that the second lens 70b is integrally formed on the third lens 90.
[0077] It is understandable that the number of the third lenses 90 may be two or more, and the grating structure 1 may be integrally formed on the third lenses 90 in the above-mentioned manner.
[0078] In the above, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and substitutions are all within the scope defined by the present application.
Claims
1. A mold for a waveguide lens, characterized in that: include: A first mold, one side of which is provided with a first groove for molding a first lens; a second mold, used for molding with the first mold, the second mold having a first surface on a side facing the first mold, the first surface being provided with a first grating structure, the first surface enclosing the first groove body, the first grating structure extending into the first groove body or communicating with the first groove body, and being used for integrally molding the second grating structure on the first lens; The third mold is used to be molded together with the first mold. A second groove is opened on one side of the third mold. The second groove is used to form a second lens on the surface of the first lens.
2. The mold for a waveguide lens according to claim 1, characterized in that: The first grating structure has a groove structure concavely arranged on the first surface, and the groove structure is connected to the first groove body, so that the second grating structure is convexly arranged on the first lens.
3. The mold for a waveguide lens according to claim 2, characterized in that: The first grating structure further includes a plurality of grating protrusions, the plurality of grating protrusions are arranged in the groove structure, the plurality of grating protrusions are arranged at intervals, and a sub-groove is formed between any two adjacent grating protrusions, and the sub-groove is connected to the first groove body.
4. The mold for a waveguide lens according to claim 3, characterized in that: The protrusion length of the grating protrusion is the same as the depth of the groove structure.
5. The mold for a waveguide lens according to claim 1, characterized in that: The first grating structure is a protruding structure convexly disposed on the first surface and extending into the first groove body, so as to make the second grating structure concavely disposed on the first lens.
6. The mold for a waveguide lens according to claim 5, characterized in that: The second groove body is connected to the second grating structure so as to integrally form a third grating structure on the second lens.
7. The mold for a waveguide lens according to claim 1, characterized in that: The first lens has a second surface, the second surface is provided with the second grating structure, and the outer diameter of the second surface is not less than the diameter of the second slot body.
8. The mold for a waveguide lens according to claim 1, characterized in that: The first grating structure is provided in plurality, and the plurality of first grating structures are arranged on the first surface at intervals along the radial direction of the second mold.
9. A waveguide lens, characterized in that: The mold for a waveguide lens as claimed in any one of claims 1 to 8 is used, comprising a grating structure, and a first lens and a second lens stacked, wherein the first lens and the second lens are integrally formed, and the grating structure is located between the first lens and the second lens, and is integrally formed with the first lens and the second lens.
10. The waveguide lens according to claim 9, wherein: The waveguide lens also includes a third lens, which is located between the first lens and the second lens and is integrally formed with the first lens and the second lens.