CN117075252B - Geometric optical waveguide and preparation method thereof - Google Patents
Geometric optical waveguide and preparation method thereof Download PDFInfo
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- CN117075252B CN117075252B CN202311319610.3A CN202311319610A CN117075252B CN 117075252 B CN117075252 B CN 117075252B CN 202311319610 A CN202311319610 A CN 202311319610A CN 117075252 B CN117075252 B CN 117075252B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 485
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 239000000758 substrate Substances 0.000 claims abstract description 205
- 239000000463 material Substances 0.000 claims abstract description 121
- 239000012788 optical film Substances 0.000 claims abstract description 60
- 238000005520 cutting process Methods 0.000 claims abstract description 41
- 239000000853 adhesive Substances 0.000 claims abstract description 39
- 230000001070 adhesive effect Effects 0.000 claims abstract description 39
- 210000002268 wool Anatomy 0.000 claims abstract description 37
- 238000000576 coating method Methods 0.000 claims abstract description 32
- 239000011248 coating agent Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000010408 film Substances 0.000 claims description 9
- 238000003618 dip coating Methods 0.000 claims description 4
- 238000007639 printing Methods 0.000 claims description 4
- 238000004528 spin coating Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims 1
- 238000005498 polishing Methods 0.000 abstract description 15
- 238000005482 strain hardening Methods 0.000 abstract description 14
- 238000011049 filling Methods 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000000227 grinding Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
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- 230000003190 augmentative effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- Optics & Photonics (AREA)
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Abstract
The application provides a geometric optical waveguide and a preparation method thereof, wherein the method comprises the following steps: inserting a flat plate sheet with an optical film between adjacent optical substrates, and bonding the flat plate sheet into an optical module through optical adhesive; wherein the roughness of the optical film is less than the roughness of the optical substrate; cutting the optical module to form a rough piece; coating a first optical material layer on the opposite surfaces of the wool sheet; wherein, the refractive indexes of the substrate, the optical substrate, the first optical material layer and the optical adhesive of the flat plate sheet are approximately the same. And carrying the optical film by the flat plate substrate, filling optical adhesive with similar refractive index on the rough surface of the optical substrate after cutting, and adhering and fixing the optical film and the flat plate. The optical adhesive material has good fluidity, can fill the hollow surface of each part without dead angle, and achieves the polishing purpose of cold working, so that the optical substrate is not required to be polished, the preparation process of the optical waveguide is simplified, and the geometrical optical waveguide is manufactured in a simpler mode.
Description
Technical Field
The application relates to the technical field of optical waveguides, in particular to a geometric optical waveguide and a preparation method thereof.
Background
With the development of near-eye display technology, the requirements on the performance of the geometric optical waveguide are also higher and higher flatness of the geometric optical waveguide is required to meet the performance of the optical waveguide. Therefore, the current flow in the geometric optical waveguide preparation process generally adopts: optical substrate cutting, cold working grinding and polishing, film plating, bonding, cutting, and cold working grinding and polishing. In the above process, two cold working processes are required, and the cold working process time is longest and the loss is greatest, which greatly increases the processing cost and the production period of several optical waveguides.
Disclosure of Invention
The application provides a geometric optical waveguide and a preparation method thereof, which are used for reducing the processing cost and the production period of the geometric optical waveguide.
In a first aspect, a method for preparing a geometric optical waveguide is provided, the method for preparing a geometric optical waveguide comprising the steps of:
arranging the optical substrates in a single row;
inserting a flat plate sheet with an optical film between adjacent optical substrates, and bonding the adjacent optical substrates and the flat plate sheet into an optical module through optical adhesive; wherein the flat sheet includes a flat sheet substrate laminated along an arrangement direction of the optical substrates, and an optical film; the refractive indexes of the optical substrate, the flat plate substrate and the optical adhesive are approximately the same; and the roughness of the optical film is smaller than the roughness of the optical substrate;
cutting the optical module to form a rough piece; wherein the cutting direction is along the arrangement direction of the plurality of optical substrates;
coating a first optical material layer on two opposite surfaces formed by cutting on the wool sheet respectively; wherein the refractive index of the first optical material layer is substantially the same as that of the optical substrate.
In the technical scheme, the optical film is borne by the flat plate substrate, the rough surface of the optical substrate after cutting is filled with optical adhesive with similar refractive index, and the optical film and the flat plate are adhered and fixed. The optical adhesive material has good fluidity, can fill the hollow surface of each part without dead angle, and achieves the polishing purpose of cold working, so that the optical substrate is not required to be polished, the preparation process of the optical waveguide is simplified, and the geometrical optical waveguide is manufactured in a simpler mode.
In a specific embodiment, the refractive indices of the optical substrate, the flat substrate and the optical adhesive are substantially the same, specifically:
the refractive index deviation of the flat plate sheet and the optical substrate is less than 1.54%;
the refractive index deviation of the optical adhesive and the optical substrate is less than 1.54%.
In a specific embodiment, the optical film is a multi-angle spectroscopic film.
In a specific embodiment, the refractive index of the first optical material layer and the refractive index of the optical substrate are substantially the same, specifically: the refractive index deviation of the first optical material layer from the optical substrate is less than 1.54%.
In a specific embodiment, when the two opposite surfaces of the fleece formed by cutting are coated with a first optical material layer, respectively, the roughness of the surface of the first optical material layer facing away from the fleece is smaller than the roughness of the fleece.
In a specific embodiment, the method further comprises the steps of:
respectively laminating optical flat plates on two opposite surfaces of the wool sheet, and fixedly connecting the optical flat plates with the wool sheet through the first optical material layer; wherein the refractive index of the optical flat sheet is substantially the same as the refractive index of the optical substrate;
coating a second optical material layer on one side of the optical flat plate away from the wool sheet; the refractive index of the second optical material layer is approximately the same as that of the optical substrate, and the roughness of the surface of the second optical material layer, which faces away from the optical flat sheet, is smaller than that of the surface of the optical flat sheet, which faces away from the rough sheet.
In a specific embodiment, the refractive index of the second optical material layer and the refractive index of the optical substrate are substantially the same, specifically:
the refractive index of the optical flat sheet deviates from the refractive index of the optical substrate by less than 1.54%.
In a second aspect, a geometric optical waveguide is provided, the geometric optical waveguide comprising a blank and a first layer of optical material; wherein, the flat slice is connected with the adjacent optical substrate through optical adhesive;
the flat sheet slice comprises flat sheet base undercut slices and optical film slices which are stacked along the arrangement direction of the optical substrate slices;
the refractive indexes of the flat sheet base slice, the optical adhesive and the optical substrate slice are approximately the same;
the roughness of the surface of the optical film slice is smaller than that of the surface of the optical substrate slice in two surfaces of the optical film slice opposite to the adjacent optical substrate slice;
the refractive index of the first optical material layer is approximately the same as that of the optical substrate slice
In the technical scheme, the optical film is borne by the flat plate substrate, the rough surface of the optical substrate after cutting is filled with optical adhesive with similar refractive index, and the optical film and the flat plate are adhered and fixed. The optical adhesive material has good fluidity, can fill the hollow surface of each part without dead angle, and achieves the polishing purpose of cold working, so that the optical substrate is not required to be polished, the preparation process of the optical waveguide is simplified, and the geometrical optical waveguide is manufactured in a simpler mode.
In a specific embodiment, the refractive index deviation of the planar sheet base undercut sheet from the optical substrate slice is less than 1.54%;
the refractive index deviation of the optical adhesive and the optical substrate slice is less than 1.54%.
In a specific embodiment, the optical film slices are specifically multi-angle spectroscopic film slices.
In a specific embodiment, the surface of the first layer of optical material facing away from the fleece has a roughness that is less than the roughness of the fleece.
In a specific embodiment, the optical device further comprises an optical flat sheet and a second optical material layer; wherein,
the optical flat sheet is fixedly connected with the wool sheet through the first optical material layer; and the optical flat sheet and the rough sheet are arranged on two opposite sides of the first optical material layer;
the second optical material layer covers one side of the optical flat plate away from the first optical material layer; wherein the refractive index of the second optical material layer is substantially the same as the refractive index of the optical substrate slice;
the roughness of the surface of the second optical material layer, which faces away from the optical flat sheet, is smaller than the roughness of the surface of the optical flat sheet, which faces away from the rough sheet.
In a specific embodiment, the refractive index of the optical flat sheet deviates from the refractive index of the optical substrate slice by less than 1.54%.
Drawings
FIG. 1 is a flow chart of a method for fabricating a geometric optical waveguide according to an embodiment of the present application;
FIG. 2 is a schematic diagram of cutting an optical material according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a cut optical substrate according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of an arrangement of an optical substrate and a flat sheet according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating cutting of an optical module according to an embodiment of the present disclosure;
fig. 7 is a schematic structural view of a wool sheet according to an embodiment of the present application;
FIG. 8 is a schematic diagram illustrating the cooperation between the first optical material layer and the wool patch according to an embodiment of the present disclosure;
FIG. 9 is a schematic structural diagram of a geometric optical waveguide according to an embodiment of the present disclosure;
FIG. 10 is a schematic diagram illustrating the cooperation between the second optical material layer and the optical flat and the blank according to the embodiment of the present application;
fig. 11 is a schematic structural diagram of another geometric optical waveguide according to an embodiment of the present disclosure.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
It is noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In order to facilitate understanding of the preparation method of the optical waveguide provided by the embodiment of the application, an application scene of the optical waveguide is first introduced. The preparation method of the optical waveguide provided by the embodiment of the application is used for preparing the optical waveguides applied to different display scenes such as AR (Augmented Reality ) or VR (Virtual Reality). In the prior art, a plurality of cold working steps are needed in the preparation process of the optical waveguide, for example, before coating, the optical substrate formed by cutting the optical material needs to be subjected to cold working, grinding and polishing, and then coating is carried out. The cold working step takes a long time to cool, which greatly affects the manufacturing efficiency of the optical waveguide. Therefore, the embodiment of the application provides a preparation method of the optical waveguide so as to improve the preparation efficiency of the optical waveguide. The following detailed description is made with reference to the specific drawings and examples.
Referring to fig. 1, fig. 1 shows a flowchart of a method for manufacturing a geometric optical waveguide according to an embodiment of the present application. The flow of the preparation method of the geometric optical waveguide provided by the embodiment of the application comprises the following steps:
step 001: arranging the optical substrates in a single row;
specifically, referring to fig. 2 and 3, the optical material 100 is cut into optical substrates 10 of a desired size. Wherein the desired dimensions can be determined based on the optical waveguide being fabricated. The cutting mode adopted in cutting is not limited to the cutting modes such as linear cutting, laser cutting, linear cutting, multi-cutter cutting, internal circular cutting and the like. In addition, in cutting, it is necessary to ensure the accuracy of the surface shape after cutting. The surface accuracy refers to the surface accuracy of the surface formed at the time of cutting.
The optical material 100 includes, but is not limited to, glass, resin, silica gel, etc., but any substrate having optical properties may be used in the embodiments of the present application.
When a plurality of optical substrates 10 are arranged in a single row, the optical substrates 10 are arranged in a desired size and position according to the requirements of the geometric optical waveguides (hereinafter simply referred to as optical waveguides) to be formed.
Step 002: inserting a flat sheet between adjacent optical substrates, and bonding the adjacent optical substrates and the flat sheet into an optical module through optical adhesive;
specifically, referring to fig. 4, a flat sheet 20 is interposed between optical substrates 10 arranged in a single row, wherein the flat sheet 20 includes a flat sheet base 21 and an optical film 22 laminated along the arrangement direction of the optical substrates 10. And the optical film 22 is oriented toward one optical substrate 10 adjacent to the flat sheet 20 and the flat sheet base 21 is oriented toward the other optical substrate 10 adjacent to the flat sheet 20. Referring to fig. 5, when the flat sheet 20 and the optical substrate 10 are bonded by the optical adhesive, the optical substrate 10 and the optical film 22 of the flat sheet 20 are bonded by the optical adhesive 30. That is, along the arrangement direction of the optical substrate 10, the optical adhesive 30, the optical film 22, the flat sheet substrate 21, and the optical film 22 are arranged to form a single unit to form an integral optical module.
As an alternative, the optical film 22 may be a multi-angle spectroscopic film. The main characteristics are that: the light has a specific proportion reflection effect when the light is approximately incident at an angle of 10-40 degrees; light has a low reflection at an approximate incidence angle of 50-89 deg.. The optical film 22 is incorporated into an optical waveguide to provide a light splitting effect to enhance the optical performance of the optical waveguide.
When the refractive index deviation between the optical cement 30 and the optical substrate 10 is too large, total reflection occurs when light is conducted between the optical substrate 10, the optical cement 30, and the flat sheet substrate 21. Therefore, the refractive index between the optical substrate 10, the optical paste 30, and the flat sheet substrate 21 needs to be considered in forming the optical module to ensure the optical performance of the formed optical waveguide. In a specific arrangement, the refractive indices of the optical substrate 10, the flat substrate 21, and the optical cement 30 are substantially the same, so that total reflection between different layer structures is avoided, and the optical performance of the formed optical waveguide is ensured. The substantially same means that the refractive indices of the optical substrate 10, the flat substrate 21, and the optical cement 30 are identical, or that the deviation of the refractive indices of the optical substrate 10, the flat substrate 21, and the optical cement 30 satisfies the total reflection angle of 80 ° or more.
In a specific embodiment, the optical substrate 10 is exemplified by refractive indices of 1.5, 1.7, 2.0 according to the total reflection calculation method, and the calculation results are shown in table 1.
TABLE 1
Referring to table 1, the total reflection angle was already less than 80 ° at a refractive index deviation of 1.54%, in which case the optical waveguide conduction efficiency was low, and performance advantages were not obtained. Therefore, in the embodiment of the present application, the following relationship is satisfied between refractive indexes among the optical substrate 10, the optical paste 30, and the flat sheet substrate 21: the refractive index deviation of the flat sheet base 21 from the optical substrate 10 is less than 1.54%; the refractive index deviation of the optical cement 30 and the optical substrate 10 is less than 1.54%. As an example, a refractive index deviation of 1.54%, 1.5%, 1.2%, 0.8%, 0.4%, or the like of the optical cement 30 from the optical substrate 10 may be employed as a value of any less than 1.54%. In the same manner, the refractive index deviation between the flat sheet base 21 and the optical substrate 10 is 1.54%, 1.5%, 1.2%, 0.8%, 0.4%, or the like, which is arbitrarily smaller than 1.54%. Thereby ensuring that the optical module can meet the optical performance of the optical waveguide when being prepared into the optical waveguide.
The optical film 22 and the optical substrate 10 satisfy: the roughness of the optical film 22 is less than the roughness of the optical substrate 10. I.e. the planarity of the surface of the optical film 22 facing the optical substrate 10 is greater than the planarity of the surface of the optical substrate 10 facing the optical film 22. When the roughness of the surface on which the optical film 22 is formed is smaller than that of the surface of the optical substrate 10, the optical film 22 is formed by plating the optical film 22 on the flat substrate 21 having high flatness. As a specific example, in disposing the optical film 22 on the flat sheet substrate 21, the optical film 22 may be prepared on the flat sheet 20 by coating the optical film 22. Among them, the coating modes are various, including but not limited to roll coating, spray coating, dip coating, spin coating, printing, and the like.
When the optical substrate 10 and the optical film 22 are bonded by the optical cement 30, the optical cement 30 with similar refractive index can be filled, so that each hollow on the surface of the optical substrate 10 can be filled without dead angle by good fluidity of the optical cement 30, and the flatness of the optical film 22 when being bonded with the optical substrate 10 is ensured. Compared with the prior art, the preparation mode does not need to cool, grind and polish the optical substrate 10, thereby reducing the preparation process of the optical waveguide and reducing the production cost of the optical waveguide.
The materials of the flat sheet substrate 21 include, but are not limited to, glass, resin, silica gel, etc., but any substrate having optical properties may be used in the embodiments of the present application.
In addition, the thickness of the flat sheet base 21 in the arrangement direction of the optical substrate 10 is smaller than the thickness of the optical substrate 10. Illustratively, the thickness of the optical substrate 10 is between 1.0 mm and 20 mm, while the thickness of the flat sheet base 21 is below 0.2mm, so the thickness of the optical substrate 10 is much greater than the thickness of the flat sheet base 21. Under the same coating yield, the cost of directly coating the flat plate substrate 21 used in the embodiments of the present application is lower than that of coating the optical film 22 on the optical substrate 10 in the prior art.
In summary, when the optical film 22 is prepared on the optical substrate 10 by the preparation method in the prior art, the optical film 22 needs to be coated on the surface of the optical substrate 10 by a film plating method, and the optical substrate 10 needs to be surface ground and polished, which is costly. Meanwhile, coating in this way causes cost loss due to the influence of yield. In the preparation method provided by the application, the optical film 22 is directly coated on the flat plate substrate 21, and then the optical film 22 is adhered to the optical substrate 10 through the optical adhesive 30. The steps such as grinding and polishing are not required for the optical substrate 10, and the process is simplified. In addition, the technical scheme of the application can be compared with the scheme in the prior art: the surface of the flat sheet substrate 21 in the embodiment of the present application is smooth, and the implementation manner may be implemented without polishing, and the smooth effect may be achieved in a manner with lower cost, for example: stretching, injection molding, float, stamping, etc. As can be seen from a comparison of the prior art in which polishing of an optical substrate is required, the cost of purchasing the flat sheet substrate 21 is much less than the cost of polishing an optical substrate, since the flat sheet substrate 21 does not require polishing and the thickness of the flat sheet substrate 21 is much less than the thickness of an optical substrate. In addition, in the present application, the optical film 22 is prepared on the flat plate substrate 21, compared with the solution of directly preparing the optical film onto the optical substrate in the prior art, in the case of failure of film coating, only one optical film 22 needs to be worn out, one optical substrate 10 needs to be worn out in the prior art, and the cost of one optical film 22 is far less than that of one optical substrate 10, so that the preparation cost can be reduced under the same yield.
Step 003: cutting the optical module to form a rough piece;
specifically, after the optical substrate 10 and the flat sheet 20 are bonded together to form an optical module, the optical module is cut, and the cutting method to be used is not limited to the cutting method such as wire cutting, laser cutting, linear cutting, multi-blade cutting, and inner circle cutting. Wherein the cutting direction is along the arrangement direction of the plurality of optical substrates 10.
Referring to fig. 6, after bonding the optical substrate 10 and the flat sheet 20 in a desired manner, secondary dicing is performed in a desired angular direction to cut a piece of wool having a waveguide form, the structure of which is shown in fig. 7. After dicing, the optical substrate 10 forms an optical substrate slice 110 and the flat sheet 20 forms a flat sheet slice 210.
It should be understood that the above-mentioned cutting direction along the arrangement direction of the plurality of optical substrates 10 means that the cutting direction is parallel to the arrangement direction of the optical substrates 10, or the cutting direction is at an angle to the arrangement direction of the optical substrates 10. But in any of the ways described above, it is ensured that each optical substrate 10 and flat sheet 20 are cut at the time of dicing.
Step 004: coating a first optical material layer on two opposite surfaces formed by cutting on the wool sheet respectively;
specifically, as shown in fig. 8 and 9, an optical material is applied to the surface of the wool sheet, and a first optical material layer is formed. The surface of the rough piece is a surface perpendicular to the arrangement direction of the optical substrate 10, that is, a surface formed when cutting in step 003.
The material used for the first optical material layer 40 provided in this embodiment may be optical glue or curable optical material, for example, optical materials such as UV optical glue, organic photo-curing material, silica gel, etc., so that different materials may be used as the first optical material layer 40 to prepare on the wool sheet.
In particular coating the first optical material layer 40, different coating modes may be employed, which may include, but are not limited to, roll coating, spray coating, dip coating, spin coating, printing, and the like. The preparation of the first optical material layer 40 on the wool sheet may thus be accomplished by a variety of coating processes.
In addition, the refractive index of the first optical material layer 40 is substantially the same as that of the optical substrate 10 to ensure the optical performance of the optical waveguide. Specifically, the refractive index deviation of the first optical material layer 40 from the optical substrate 10 is less than 1.54%. Illustratively, the refractive index deviation of the first optical material layer 40 from the optical substrate 10 is any value less than 1.54%, 1.5%, 1.2%, 0.8%, 0.4%, etc. The refractive index of the first optical material layer 40 and the refractive index of the optical substrate 10 can refer to the refractive index relationship between the optical adhesive 30, the flat substrate 21, etc. and the optical substrate 10 in table 1, and will not be described in detail herein.
As an alternative, to improve the flatness of the light-emitting surface of the optical waveguide, when the first optical material layer 40 is provided, the roughness of the surface of the first optical material layer 40 facing away from the burr is smaller than that of the burr. Thus, the concave region on the surface of the rough piece can be filled with the first optical material layer 40, and the concave region on the surface of the rough piece can be filled without dead angles by utilizing the flowability of the material in the first optical material layer 40. And a relatively low roughness, i.e., a relatively high planarity, of the surface of the coated first optical material layer 40 can be ensured during the coating process. Compared with the cold working grinding and polishing process adopted in the prior art, the method of coating the first optical material layer 40 to change the surface flatness of the optical waveguide can greatly reduce the preparation time of the optical waveguide and improve the production efficiency of the optical waveguide. In addition, the first optical material layer 40 is coated on the rough piece, and compared with the polishing mode in the prior art, the surface with better, smoother and more uniform roughness can be obtained, so that the emergent rays of the formed geometric optical waveguide are more uniform.
A roughened topography is formed on the cut surface of the optical substrate 10 and the substrate surface is polished clear by cold working in a conventional manner. Since the roughened surface of the optical substrate 10 after dicing is essentially pitted, scattering is excessive, and thus a frosted surface is formed. Thus, in the production method provided in the embodiment of the present application, such a roughened surface can be eliminated by filling it with an optical medium (optical cement 30) of similar refractive index. The optical cement 30 and the curable optical material with similar refractive indexes have good fluidity, can fill the hollow surfaces of each part without dead angles, and achieve the polishing purpose of cold working, thereby simplifying the preparation process of the optical waveguide and realizing the optical waveguide by simpler preparation.
In addition to the optical waveguides illustrated above, other configurations of the optical waveguides may be used. Therefore, the preparation method of the optical waveguide provided by the embodiment of the application also has the preparation method of the optical waveguide corresponding to other structural forms. Referring to fig. 4, the last step in another method of fabricating an optical waveguide is illustrated in fig. 4. Other steps in the preparation method of the optical waveguide can refer to the steps 001 to 004 in the above example. The steps illustrated in fig. 4 are described in detail below.
Step 005: and respectively laminating optical flat plates on two opposite surfaces of the wool sheet, and fixedly connecting the first optical material layer with the wool sheet through the first optical material layer.
Specifically, the description of the first optical material layer 40 may be referred to as shown in step 004. Referring to fig. 9 and 10, when the optical flat sheet 50 is bonded to the wool sheet, the bonding and fixing are performed by the first optical material layer 40. The material of the optical flat sheet 50 may be the same as that of the optical substrate 10, and includes, but is not limited to, glass, resin, silica gel, etc., but any substrate having optical properties may be used in the embodiments of the present application.
The refractive index of the optical flat sheet 50 is substantially the same as that of the optical substrate 10. Illustratively, the refractive index deviation of the optical flat sheet 50 from the optical substrate 10 is less than 1.54%. For example, the refractive index deviation of the optical flat sheet 50 from the optical substrate 10 is 1.54%, 1.5%, 1.2%, 0.8%, 0.4%, etc. which is arbitrarily smaller than 1.54% to ensure the optical performance of the optical waveguide.
In the manufacturing method of the present embodiment, since the optical flat sheet 50 is attached, there is no requirement for the roughness of the first optical material layer 40.
Step 006, coating a second optical material layer 60 on one side of the optical flat plate away from the rough plate;
specifically, referring to fig. 10 and 11, the second optical material layer 60 may be an optical adhesive or a cured material, so that different materials may be used as the second optical material layer 60 to prepare the optical flat 50.
The second layer of optical material 60 may be attached to the optical flat 50 by coating. In particular coating, different coating modes may be employed, which may include, but are not limited to, roll coating, spray coating, dip coating, spin coating, printing, and the like. The preparation of the second optical material layer 60 on the wool sheet may thus be accomplished by a variety of coating processes.
In addition, the refractive index of the second optical material layer 60 is substantially the same as that of the optical substrate 10 to ensure the optical performance of the optical waveguide. Specifically, the refractive index deviation of the second optical material layer 60 from the optical substrate 10 is less than 1.54%. Illustratively, the refractive index deviation of the second optical material layer 60 from the optical substrate 10 is any value less than 1.54%, 1.5%, 1.2%, 0.8%, 0.4%, etc. The refractive index of the second optical material layer 60 and the refractive index of the optical substrate 10 can refer to the refractive index relationship between the optical adhesive 30, the flat substrate 21, etc. and the optical substrate 10 in table 1. And will not be described in detail herein.
In order to improve the flatness of the light exit surface of the optical waveguide, when the second optical material layer 60 is provided, the roughness of the surface of the second optical material layer 60 facing away from the optical flat sheet 50 is smaller than the roughness of the surface of the Yu Guangxue flat sheet 50 facing away from the rough sheet. Thus, the recessed areas on the surface of the optical flat sheet 50 can be filled with the second optical material layer 60, and during the coating process, it can be ensured that the roughness of the surface of the coated second optical material layer 60 is relatively low, i.e. the flatness is relatively high. By adopting the steps, the optical flat sheet 50 does not need to be subjected to cooling, grinding and polishing, and the preparation efficiency of the optical waveguide is improved.
Referring to fig. 9 and 11, embodiments of the present application also provide a geometric optical waveguide including a blank and a first optical material layer 40; wherein the first optical material layer 40 covers opposite surfaces of the fleece. Specifically, the wool top and the first optical material layer 40 may refer to the wool top and the first optical material layer 40 formed in steps 001 to 004 of the above-mentioned preparation method.
The structure of the blank sheet may be specifically a single row of optical substrate slices 110 and flat sheet slices 210 distributed between any adjacent optical substrate slices 110, that is, the optical substrate slices 110 and the flat sheet slices 210 are alternately arranged. In addition, the flat sheet slice 210 is bonded to the adjacent optical substrate 110 by the optical adhesive 310, thereby forming a whole.
The flat sheet slice 210 includes a flat sheet base undercut slice 211 and an optical film slice 212 stacked in the arrangement direction of the optical substrate slice 110. When the flat sheet 21 is connected to the optical substrate slice 110, the flat sheet base slice 211 and the optical film slice 212 are bonded to the adjacent optical substrate slice 110 by the optical adhesive 30 in a one-to-one correspondence manner. Namely, the arrangement mode of the structures of all parts in the wool sheet is as follows: optical substrate slice 110, optical adhesive 30, optical film slice 212, flat sheet base undercut slice 211, optical adhesive 30, optical substrate slice 110 … ….
The optical film slice 212 is a film layer plated on the flat plate substrate undercut slice 211, and the optical film slice 212 is specifically a multi-angle spectroscopic film. Reference is made in particular to the relevant description in step 002.
In a specific arrangement, the refractive indices of the flat sheet base undercut piece 211, the optical adhesive 30 and the optical substrate slice 110 are substantially the same, and the roughness of the surface of the optical film slice 212 is smaller than the roughness of the surface of the optical substrate slice 110, of the two surfaces of the optical film slice 212 opposite to the adjacent optical substrate slice 110. The refractive indexes of the flat substrate undercut 211, the optical adhesive 30 and the optical substrate slice 110 are the refractive indexes of the flat substrate 21, the optical adhesive 30 and the optical substrate 10. Illustratively, the refractive index deviation of the planar sheet base undercut piece 211 from the optical substrate slice 110 is less than 1.54%; the refractive index deviation of the optical cement 30 from the optical substrate slice 110 is less than 1.54%. Specific reference is made to the description of steps 001 to 003, and detailed description thereof will not be repeated here.
When the first optical material layer 40 is disposed, the first optical material layer 40 covers the flat sheet substrate slice 211, the optical film slice 212, the optical adhesive 30 and the optical substrate slice 110, and forms a sandwich structure with the rough sheet. The refractive index of the first optical material layer 40 is substantially the same as that of the optical substrate slice 110. As an alternative, the surface of the first layer of optical material 40 facing away from the fleece has a roughness less than the roughness of the fleece. Reference may be made specifically to the relevant description in step 004, and this is not repeated here.
In an alternative, the optical waveguide may further comprise an optical slab 50 and a second layer of optical material 60. Wherein the optical flat sheet 50 is fixedly connected with the wool sheet through the first optical material layer 40; and the optical flat sheet 50 is arranged on opposite sides of the first optical material layer 40 from the wool sheet. Wherein the refractive index of the optical flat 60 is substantially the same as the refractive index of the optical substrate slice 110, e.g., the refractive index deviation of both is less than 1.54%. Reference is made specifically to the relevant descriptions in step 005 and step 006.
When the second optical material layer 60 is specifically disposed, the second optical material layer 60 covers a side of the optical flat sheet 50 facing away from the first optical material layer 40; wherein the refractive index of the second optical material layer 60 and the refractive index of the first optical material layer 40 are substantially the same as the refractive index of the optical substrate slice 110; illustratively, the refractive index of the optical flat sheet 50 deviates less than 1.54% from the refractive index of the optical substrate slice 110. In addition, the surface of the second layer of optical material 60 facing away from the optical flat sheet 50 has a roughness less than the roughness of the Yu Guangxue flat sheet 50. Reference is made specifically to the relevant descriptions in step 005 and step 006.
As can be seen from the above description, in the optical waveguide provided in the embodiments of the present application, the optical film is carried by the flat plate substrate, and the rough surface of the optical substrate after cutting is filled with the optical adhesive with similar refractive index, so that the optical substrate and the flat plate are adhered and fixed. The optical cement material with similar refractive index has good fluidity, can fill the hollow surface of each part without dead angle, and achieves the polishing purpose of cold working, so that the optical substrate is not required to be polished, the preparation process of the optical waveguide is simplified, and the geometrical optical waveguide is manufactured in a simpler mode.
The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the disclosure, are therefore intended to be included within the scope of the disclosure.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for preparing a geometric optical waveguide, comprising the steps of:
arranging the optical substrates in a single row;
inserting a flat sheet between adjacent optical substrates, and bonding the adjacent optical substrates and the flat sheet into an optical module through optical adhesive; wherein the flat sheet includes a flat sheet base laminated along an arrangement direction of the optical substrates and an optical film; the refractive indexes of the optical substrate, the flat sheet base and the optical adhesive are approximately the same; and the roughness of the optical film is smaller than the roughness of the optical substrate;
cutting the optical module to form a rough piece; wherein the cutting direction is along the arrangement direction of the plurality of optical substrates;
coating a first optical material layer on two opposite surfaces formed by cutting on the wool sheet respectively; wherein, the refractive index deviation between the first optical material layer and the optical substrate is between 0.4% and 1.54%; the coating mode can comprise one of rolling coating, spraying, dip coating, spin coating or printing;
when two opposite surfaces formed by cutting are respectively coated with a first optical material layer on the wool sheet, the roughness of the surface of the first optical material layer, which faces away from the wool sheet, is smaller than that of the wool sheet; in particular, during the coating process, the roughness of the surface of the coated first optical material layer is lower than the roughness of the wool sheet.
2. The method according to claim 1, wherein the refractive indices of the optical substrate, the flat sheet substrate, and the optical adhesive are substantially the same, specifically:
the refractive index deviation of the flat sheet substrate and the optical substrate is less than 1.54%;
the refractive index deviation of the optical adhesive and the optical substrate is less than 1.54%.
3. The method of claim 1, wherein the optical film is a multi-angle spectroscopic film.
4. The preparation method according to any one of claims 1 to 3, further comprising the steps of:
respectively laminating optical flat plates on two opposite surfaces of the wool sheet, and fixedly connecting the first optical material layer with the wool sheet through the first optical material layer; wherein the refractive index of the optical flat sheet is substantially the same as the refractive index of the optical substrate;
coating a second optical material layer on one side of the optical flat plate away from the wool sheet; the refractive index of the second optical material layer is approximately the same as that of the optical substrate, and the roughness of the surface of the second optical material layer, which faces away from the optical flat sheet, is smaller than that of the surface of the optical flat sheet, which faces away from the rough sheet.
5. The method according to claim 4, wherein the refractive index of the second optical material layer is substantially the same as that of the optical substrate, specifically:
the refractive index of the optical flat sheet deviates from the refractive index of the optical substrate by less than 1.54%.
6. A geometric optical waveguide, comprising a wool sheet and a first optical material layer, wherein the first optical material layer covers two opposite surfaces of the wool sheet; wherein,
the wool sheet comprises optical substrate slices which are arranged in a single row, and flat sheet slices which are distributed among any adjacent optical substrate slices; wherein, the flat slice is connected with the adjacent optical substrate through optical adhesive;
the flat sheet slice comprises flat sheet base undercut slices and optical film slices which are stacked along the arrangement direction of the optical substrate slices;
the refractive indexes of the flat sheet base slice, the optical adhesive and the optical substrate slice are approximately the same;
the roughness of the surface of the optical film slice is smaller than that of the surface of the optical substrate slice in two surfaces of the optical film slice opposite to the adjacent optical substrate slice;
the refractive index of the first optical material layer is different from that of the optical substrate slice, and the refractive index deviation of the first optical material layer and the optical substrate slice is between 0.4% and 1.54%;
the roughness of the surface of the first optical material layer facing away from the wool sheet is smaller than that of the wool sheet; in particular, during the coating process, the roughness of the surface of the coated first optical material layer is lower than the roughness of the wool sheet.
7. A geometric optical waveguide according to claim 6 wherein,
the refractive index deviation of the flat sheet base undercut sheet and the optical substrate slice is less than 1.54%;
the refractive index deviation of the optical adhesive and the optical substrate slice is less than 1.54%.
8. A geometric optical waveguide according to claim 6, wherein the optical film slices are in particular multi-angle spectroscopic film slices.
9. A geometric optical waveguide according to any one of claims 6 to 8, further comprising an optical slab and a second layer of optical material; wherein,
the optical flat sheet is fixedly connected with the wool sheet through the first optical material layer; and the optical flat sheet and the rough sheet are arranged on two opposite sides of the first optical material layer;
the second optical material layer covers one side of the optical flat plate away from the first optical material layer; wherein the refractive index of the second optical material layer is substantially the same as the refractive index of the optical substrate slice;
the roughness of the surface of the second optical material layer, which faces away from the optical flat sheet, is smaller than the roughness of the surface of the optical flat sheet, which faces away from the rough sheet.
10. A geometric optical waveguide according to claim 9 wherein,
the refractive index of the optical flat sheet deviates from the refractive index of the optical substrate slice by less than 1.54%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000199810A (en) * | 1998-10-30 | 2000-07-18 | Toyo Commun Equip Co Ltd | Manufacture of optical device |
| CN101191904A (en) * | 2006-11-23 | 2008-06-04 | 亚洲光学股份有限公司 | Process for preparing optical assembly |
| CN107111135A (en) * | 2014-12-25 | 2017-08-29 | 鲁姆斯有限公司 | The method of substrate-guided optics for manufacturing |
| CN108235739A (en) * | 2016-10-09 | 2018-06-29 | 鲁姆斯有限公司 | Use the aperture multiplier of rectangular waveguide |
| CN113661359A (en) * | 2019-04-15 | 2021-11-16 | 鲁姆斯有限公司 | Method for manufacturing light guide optical element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022259234A1 (en) * | 2021-06-07 | 2022-12-15 | Lumus Ltd. | Methods of fabrication of optical aperture multipliers having rectangular waveguide |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000199810A (en) * | 1998-10-30 | 2000-07-18 | Toyo Commun Equip Co Ltd | Manufacture of optical device |
| CN101191904A (en) * | 2006-11-23 | 2008-06-04 | 亚洲光学股份有限公司 | Process for preparing optical assembly |
| CN107111135A (en) * | 2014-12-25 | 2017-08-29 | 鲁姆斯有限公司 | The method of substrate-guided optics for manufacturing |
| CN108235739A (en) * | 2016-10-09 | 2018-06-29 | 鲁姆斯有限公司 | Use the aperture multiplier of rectangular waveguide |
| CN113661359A (en) * | 2019-04-15 | 2021-11-16 | 鲁姆斯有限公司 | Method for manufacturing light guide optical element |
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