TWM657833U - Molds for waveguide lens and waveguide lens - Google Patents

Abstract

The invention relates to molds for waveguide lens and waveguide lens. The molds for waveguide lens comprise a first mold, a second mold and a third mold. A side of the first mold is provided with a first groove body for forming a first lens. The second mold is used to join the first mold, the second mold is provided with a first surface towards the first mold, the first surface is provided with a first grating structure, the first surface is closed into the first groove body, the first grating structure extends into the first groove body or connects the first groove body, and is used to form a second grating structure on the first lens; the third mold is used to join the first mold, and a second groove is arranged on one side of the third mold, which is used to form a second lens on the surface of the first lens.

Description

Mold for waveguide lens and waveguide lens

The present application relates to the field of waveguide lens processing technology, and more specifically, to a mold for a waveguide lens and a waveguide lens.

Most 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 relatively large thickness of the entire lens.

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 prior art.

The embodiment of this application is implemented as follows:

A mold for a waveguide lens comprises 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 together 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 together 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.

In a possible implementation manner, the first grating structure has a groove structure recessed on the first surface, and the groove structure is connected to the first groove body, so that the second grating structure is convexly disposed on the first lens.

In a possible implementation manner: 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.

In a possible implementation manner: the convex extension of the grating protrusion is the same as the depth of the groove structure.

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.

In a possible implementation manner, the second groove is connected to the second grating structure to integrally form a third grating structure on the second lens.

In a possible implementation manner: 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.

In a possible implementation manner, a plurality of the first grating structures are provided, and the plurality of the first grating structures are arranged on the first surface at intervals along the radial direction of the second mold.

A waveguide lens is manufactured using the above-mentioned mold for waveguide lenses, 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.

In a possible implementation manner: 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.

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 formed integrally on the first lens, and the second lens is directly formed integrally 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.

The following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. When an element is considered to be "set on" another element, it may be directly set on the other element or there may be a central element at the same time. The terms "left", "right" and similar expressions used herein are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of this application. The terms used herein in the specification of this application are only for the purpose of describing specific implementations and are not intended to limit this application. The term "or/and" used herein includes any and all combinations of one or more related listed items.

Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

As shown in FIG. 1 and FIG. 2 , and referring to FIG. 5 , this embodiment 1 provides a mold 100 a for a waveguide lens, including a first mold 10 a, a second mold 20 a, and a third mold 40 a.

A first groove 11a is provided on one side of the first mold 10a for molding the 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 of the desired shape. The first lens 50a is injection 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%.

The second mold 20a is used to be molded with the first mold 10a. The second mold 20a has a first surface P1 on one 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 then 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 is connected to the first groove 11a, so as to integrally form the second grating structure 60a on the first lens 50a.

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.

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 the required shape. The second lens 70a is cast by optical lens materials such as cycloolefin copolymer (COC), polymethyl methacrylate (PMMA), polycarbonate (PC), etc., and has an optical refractive index of 1.4 to 2.0 and a transmittance of more than 90%.

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 formed integrally on the first lens 50a, and the second lens 70a is directly formed integrally on the surface of the molded first lens 50a after the third mold 40a and the first mold 10a are molded together, so that the final waveguide lens does not need to adopt a gluing process, thereby reducing the thickness of the entire waveguide lens.

Please refer to FIG. 1 and FIG. 2 and FIG. 5 again. In Embodiment 1, the first lens 50a has a second surface P2. When the first lens 50a is molded 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 molded on the second surface P2. The outer diameter of the second surface P2 is not less than the diameter of the second groove 41a to ensure that the second surface P2 can completely close the second groove 41a, and ensure the smooth casting molding of the second lens 70a.

There are multiple first grating structures 30a, which are arranged 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. There are two groove structures 311, which are arranged on the first surface P1 at intervals.

It is understandable that, when other implementations 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.

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 form a casting cavity together, so that the first lens 50a is formed in the casting cavity, and when the first lens 50a is formed, the second grating structure 60a is directly formed on the surface of the first lens 50a.

Furthermore, the first grating structure 30a further includes a plurality of grating protrusions 312. The plurality of grating protrusions 312 are disposed in the groove structure 311 and protrude outward from the bottom wall of the groove structure 311. The plurality of grating protrusions 312 are disposed 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 and the first mold 10a are molded together, 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 disposed 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. A plurality of protrusions 61 are disposed at intervals to form a second grating structure 60a.

Particularly, the convex extension 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 convex portion 61 formed after pouring the optical lens material in the sub-groove 313 is the same as the convex extension of the grating protrusion 312.

It is understood 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. Multiple convex portions 61 may be arranged side by side at intervals in one direction, or may be arranged at intervals in a circumferential direction.

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 shining grating.

Please refer to FIG. 3 and FIG. 4 and FIG. 6. 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 protrusion structure 314 protruding from the first surface P1. There are multiple protrusion structures 314, and the multiple protrusion structures 314 are arranged at intervals along a direction, and a molding groove 315 is formed between any two adjacent protrusion structures 314. When the second mold 20b and the first mold 10b are molded together, the protrusion structure 314 extends into the first groove body 11b, and the multiple molding grooves 315 are connected to the first groove body 11b to form a casting cavity. When the optical lens material is injected into the above-mentioned casting cavity, the first grating protrusion 62 is formed in the molding groove 315.

The number of the first grating protrusions 62 is the same as the number of the forming grooves 315, and the structure and shape of the first grating protrusions 62 are the same as the forming grooves 315. A first grating groove 63 is formed between two adjacent first grating protrusions 62, and the number, shape and structure of the first grating groove 63 are the same as those of the protrusion structure 314. The plurality of first grating grooves 63 constitute a second grating structure 60b, so that the second grating structure 60b is concavely provided on the first lens 50b.

Please refer to FIG. 3 and FIG. 4 and FIG. 6 . In Embodiment 2, the second groove 41 b is connected to the second grating structure 60 b so as to integrally form a third grating structure 80 on the second lens 70 b.

When the third mold 40b and the second mold 20b are molded together, the first lens 50b is located in the first groove 11b to close the second groove 41b. The plurality of first grating grooves 63 are connected to the second groove 41b to form a pouring cavity. When the optical lens material is injected into the above-mentioned pouring 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.

Except for the above structure, the structure and principle of other elements of Embodiment 2 are the same as those of Embodiment 1 and will not be described in detail.

As shown in FIGS. 5 to 7 and referring to FIG. 1 , the present application embodiment also provides a waveguide lens 200a, which is made by using the mold 100a for waveguide lenses. The waveguide lens 200a can be circular, elliptical, rectangular or square. 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.

In the waveguide lens 200a manufactured by using the mold 100a for the waveguide lens in the above-mentioned embodiment 1, the grating structure 1 is the second grating structure 60a integrally formed on the first lens 50a in the embodiment 1, and light is transmitted through the second grating structure 60a.

In the waveguide lens 200b manufactured by using the mold 100b for the waveguide lens in the above-mentioned embodiment 2, the grating structure 1 is the third grating structure 80 integrally formed on the second lens 70b in the embodiment 2, and light is transmitted through the third grating structure 80.

As shown in FIG. 7 , it is understandable that, when other implementations are adopted, the grating structure 1 may 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.

Furthermore, as shown in FIG. 7 and referring to FIG. 3 and FIG. 4 , the waveguide lens 200c further 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 the third lens 90. Subsequently, the second groove 41b of the third mold 40b is closed with the third lens 90 away from the surface of the first lens 50a, so that the second lens 70b is integrally formed on the third lens 90.

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.

The above implementations are only used to illustrate the technical solution of this application and are not intended to limit it. Although this application is described in detail with reference to the above preferred implementations, ordinary technical personnel in this field should understand that the technical solution of this application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of this application.

200a, 200b, 200c: waveguide lens 100a, 100b: mold for waveguide lens P1: first surface P2: second surface 1: grating structure 10a, 10b: first mold 11a, 11b: first groove 20a, 20b: second mold 30a, 30b: first grating structure 311: groove structure 312: grating protrusion 313: sub-groove 314: protrusion structure 315: molding groove 40a, 40b: third mold 41a, 41b: second groove 50a, 50b: first lens 60a, 60b: second grating structure 61: protrusion 62: first grating protrusion 63: First grating groove 70a, 70b: Second lens 80: Third grating structure 81: Second grating protrusion 90: Third lens

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technical personnel in this field, other related drawings can be obtained based on these drawings without creative labor.

FIG. 1 is a schematic diagram of the structure of a first mold and a second mold of a mold for a waveguide lens in Embodiment 1 of the present application.

FIG. 2 is a schematic diagram of the structure of the first mold and the third mold of the mold for the waveguide lens in Embodiment 1 of the present application.

FIG3 is a schematic diagram of the structure of the first mold and the second mold of the mold for the waveguide lens in Embodiment 2 of the present application.

FIG. 4 is a schematic diagram of the structure of the first mold and the third mold of the mold for the waveguide lens in Embodiment 2 of the present application.

FIG5 is a schematic diagram of the structure of the waveguide lens of the present application being prepared and formed using the mold for waveguide lens in Embodiment 1.

FIG6 is a schematic diagram of the structure of the waveguide lens of the present application being prepared and formed using the mold for waveguide lens in Embodiment 2.

FIG. 7 is a schematic diagram showing the structural separation of the waveguide lens in another embodiment of the present application.

100a: Mold for waveguide lens

P1: First surface

10a: First mold

11a: First tank

20a: Second mold

30a: First grating structure

311: Groove structure

312: Grating bulge

313: Subslot

Claims (10)

A mold for a waveguide lens, which is improved in that it includes: A first mold, one side of which is provided with a first groove body, used for molding a first lens; A second mold, used for molding with the first mold, the second mold has a first surface on the side facing the first mold, the first surface is provided with a first grating structure, the first surface closes the first groove body, the first grating structure extends into the first groove body or connects to the first groove body, and is used for integrally molding a second grating structure on the first lens; A third mold, used for molding with the first mold, one side of the third mold is provided with a second groove body, and the second groove body is used for molding a second lens on the surface of the first lens. A mold for a waveguide lens as described in claim 1, wherein: The first grating structure has a groove structure recessed on the first surface, the groove structure is connected to the first groove body, and is used to make the second grating structure protrude on the first lens. A mold for a waveguide lens as described in claim 2, wherein: 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. A mold for a waveguide lens as described in claim 3, wherein: The convex extension of the grating protrusion is the same as the depth of the groove structure. A mold for a waveguide lens as described in claim 1, wherein: The first grating structure is a protruding structure convexly disposed on the first surface and extending into the first groove body, so as to concavely provide the second grating structure on the first lens. A mold for a waveguide lens as described in claim 5, wherein: The second groove body is connected to the second grating structure to integrally form a third grating structure on the second lens. A mold for a waveguide lens as described in claim 1, wherein: 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. A mold for a waveguide lens as described in claim 1, wherein: 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. A waveguide lens, which is improved in that it is made using a mold for a waveguide lens as described in any one of claims 1 to 8, including a grating structure, and a first lens and a second lens stacked, the first lens and the second lens being integrally formed, the grating structure being located between the first lens and the second lens, and being integrally formed with the first lens and the second lens. A waveguide lens as described in claim 9, wherein: The waveguide lens further includes a third lens, 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.

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