CN116125590A - Optical waveguide assembly method based on granularity standard substance - Google Patents
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- 230000003287 optical effect Effects 0.000 title claims abstract description 72
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- 230000001070 adhesive effect Effects 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims description 63
- 239000003292 glue Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
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- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000011282 treatment Methods 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 2
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229920005990 polystyrene resin Polymers 0.000 claims description 2
- 229920005749 polyurethane resin Polymers 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 1
- 239000006185 dispersion Substances 0.000 abstract description 7
- 238000003475 lamination Methods 0.000 description 14
- 239000011325 microbead Substances 0.000 description 7
- 238000003384 imaging method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000010030 laminating Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
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- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/13—Integrated optical circuits characterised by the manufacturing method
-
- 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
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
-
- 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
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2555—Alignment or adjustment devices for aligning prior to splicing
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B2006/12083—Constructional arrangements
- G02B2006/12107—Grating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention belongs to the technical field of assembly, and provides an optical waveguide assembly method based on a granularity standard substance, which comprises the steps of firstly obtaining the size distribution of the diameter of the granularity standard substance, and mixing the granularity standard substance meeting the requirement after statistical analysis with a binder according to a preset proportion; then, mixing the reserved granularity standard substance with a binder according to a preset proportion; finally, the adhesive mixed with the granularity standard substances is used for fixing the edges of the two optical waveguide sheets to be overlapped, and the granularity standard substances screened out after statistical analysis are used, so that the design of intervals of different optical waveguide sheets is realized, the parallelism between the optical waveguides can be ensured, and the multi-layer optical waveguide sheets after being overlapped can well realize the improvement of dispersion.
Description
Technical Field
The invention belongs to the technical field of assembly, and particularly relates to an optical waveguide assembly method based on a granularity standard substance.
Background
In AR glasses, total reflection is critical to achieve lossless transmission of light. Total reflection needs to satisfy two conditions: the transmission medium, i.e. the waveguide material, needs to have a higher refractive index than the surrounding medium; the angle of incidence of the light into the waveguide needs to be greater than the critical angle. Optical waveguides can be generally classified into geometric optical waveguides, which are so-called array optical waveguides, which realize output of an image and expansion of an eyebox by stacking array mirrors, and diffractive optical waveguides; the diffraction optical waveguide mainly comprises a surface relief grating waveguide manufactured by utilizing a photoetching technology and a holographic body grating waveguide manufactured based on a holographic interference technology.
The same diffraction grating will correspond to different diffraction angles for different wavelengths, each color comprising a different wavelength band, and the path length that light will experience per complete total reflection will be different due to this angle. In addition, even the diffraction efficiency of the same color is floated depending on the angle of incidence, which results in that the distribution ratio of red, green and blue three-color light is different in the entire view angle range, that is, a so-called rainbow effect occurs.
The inventor finds that in order to improve the dispersion problem, red, green and blue three-color light can be coupled into the three-layer waveguide respectively by a multilayer optical waveguide sheet superposition mode, and the diffraction grating of each layer is optimized only for one color, so that the color uniformity at the final exit pupil position can be improved, and the rainbow effect is reduced. The traditional mode of directly laminating the multi-layer optical waveguide sheets by using glue according to certain interval requirements cannot ensure the parallelism between the optical waveguides, the traditional mode of mixing the microbeads and the glue for lamination has the problem that the microbead precision is not matched with the lamination precision, the multi-layer optical waveguide sheets laminated by the two methods cannot well realize the problem of improving dispersion, and the imaging requirement of the laminated optical waveguide sheets is difficult to meet.
Disclosure of Invention
In order to solve the problems, the invention provides an optical waveguide assembly method based on a granularity standard substance, which mixes the granularity standard substance subjected to statistical analysis with a binder according to a certain proportion, and then overlaps the optical waveguide sheets, and precisely controls the interval precision of different optical waveguide sheets by using the granularity standard substance screened after the statistical analysis, so that the parallelism between the optical waveguides can be ensured, and the overlapped multilayer optical waveguide sheets can well realize the improvement of dispersion.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the invention provides an optical waveguide assembly method based on a granularity standard substance, which comprises the following steps:
carrying out statistical analysis on a plurality of granularity standard substances to obtain the size distribution of the granularity standard substances;
if the size of the particle size standard substances in the preset quantity meets the preset requirement in the size distribution, mixing a plurality of particle size standard substances with the binder according to a preset proportion; otherwise, carrying out statistical analysis on other multiple granularity standard substances until the sizes of the granularity standard substances with preset numbers in the multiple granularity standard substances meet preset requirements;
and fixing the preset relative positions of the two optical waveguide sheets to be overlapped by using an adhesive mixed with the granularity standard substance.
Further, the granularity standard substance is resin or silicon dioxide; the particle size standard substance is set as solid beads or hollow beads.
Further, the binder is epoxy resin, polyurethane, polystyrene or acrylic resin.
Further, mixing the granularity standard substance with the binder, uniformly coating the mixture on the edges of the two optical waveguide sheets to be overlapped, and curing; the superposition gap between the two optical waveguide sheets is controlled by the granularity standard substance, and the relative position between the two optical waveguide sheets is controlled by the adhesive.
Further, the granularity standard substance and the binder are mixed according to the proportion of 1% -5%.
Further, the particle size standard substance and the binder are subjected to stirring, dispersing and defoaming treatment.
Further, a plurality of granularity standard substances are placed into a screen, and the granularity standard substances which meet the preset target diameter are screened out through ultrasonic vibration and swing vibration.
Further, images of a plurality of granularity standard substances are acquired, and the diameters of the granularity standard substances are obtained through an image recognition method.
Further, the plurality of granularity standard substances are subjected to statistical analysis, the granularity standard substances are sequenced according to the sequence from small particle size to large particle size, the last 30% of the sequencing result is extracted for independent analysis, and if the particle size of the last 30% of the granularity standard substances meets the particle size requirement, the plurality of granularity standard substances and the binder are mixed according to the preset proportion.
Further, the adhesive is UV glue.
Compared with the prior art, the invention has the beneficial effects that:
1. firstly, obtaining the size distribution of the diameter of a granularity standard substance through statistical analysis, and mixing the granularity standard substance meeting the requirement after the statistical analysis with a binder according to a preset proportion; finally, fixing the relative positions of the two optical waveguide sheets to be overlapped by using an adhesive mixed with the granularity standard substances, and precisely controlling the intervals of different optical waveguide sheets by using the granularity standard substances screened after statistical analysis, so that the parallelism between the optical waveguides can be ensured, and the multi-layer optical waveguide sheets after being overlapped can well realize the improvement of the chromatic dispersion problem;
2. according to the invention, the size distribution of the diameters of the granularity standard substances is obtained through statistical analysis, so that the particle sizes which actually act during assembly are obtained, the problem that the precision of the granularity standard substances is not matched with the assembly precision is solved, meanwhile, the problem that the parallelism between the overlapped optical waveguide sheets is poor due to the lower precision of the granularity standard substances is solved, and the imaging requirement of the overlapped optical waveguide sheets is met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification, illustrate and explain the embodiments and together with the description serve to explain the embodiments.
FIG. 1 is a cross-sectional view showing an example of lamination of an optical waveguide sheet according to embodiment 1 of the present invention;
FIG. 2 is a diagram showing the relationship between the size of the particle size standard substance and the lamination gap in example 1 of the present invention;
FIG. 3 is a statistical diagram of the size distribution of the particle size standard substance according to example 1 of the present invention;
1, a first optical waveguide sheet; 2. a second optical waveguide sheet; 3. a binder; 4. a particle size standard; 41. a first class of particle size standard; 42. a second class of particle size standard substances.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1:
as described in the background art, the parallelism between the optical waveguides cannot be ensured in the traditional mode of directly laminating the multilayer optical waveguide sheets by using glue according to a certain interval requirement, the problem that the precision of the microbeads is not matched with the lamination precision exists in the traditional mode of laminating by using the microbeads and the glue, the problem of improving dispersion cannot be well realized by the multilayer optical waveguide sheets laminated by the two methods, and the imaging requirement of the laminated optical waveguide sheets is difficult to meet; in view of the above problems, the present embodiment provides an optical waveguide assembly method based on a particle size standard substance, including:
carrying out statistical analysis on a plurality of granularity standard substances to obtain the size distribution of the granularity standard substances;
if the size of the particle size standard substances in the preset quantity meets the preset requirement in the size distribution, mixing a plurality of particle size standard substances with the binder according to a preset proportion; otherwise, carrying out statistical analysis on other multiple granularity standard substances until the sizes of the granularity standard substances with preset numbers in the multiple granularity standard substances meet preset requirements;
and fixing the preset relative positions of the two optical waveguide sheets to be overlapped by using an adhesive mixed with the granularity standard substance.
Firstly, obtaining detailed size distribution of a granularity standard substance through statistical analysis; then, mixing the granularity standard substance meeting the precision requirement after statistical analysis with a binder according to a preset proportion; finally, the adhesive mixed with the granularity standard substances is used for fixing the edges of the two optical waveguide sheets to be overlapped, and the granularity standard substances screened out after statistical analysis are used, so that the accurate control of the intervals of different optical waveguide sheets is realized, the parallelism between the optical waveguides can be ensured, and the multi-layer optical waveguide sheets after being overlapped can well realize the improvement of the chromatic dispersion problem.
When the multi-layer optical waveguide sheet is overlapped and fixed by adopting a mixture of granularity standard substances and adhesives, the problem of lower precision exists in a plurality of directly selected granularity standard substances, and the problem of unmatched granularity standard substances and overlapping precision is caused, so that the parallelism among the overlapped multi-layer optical waveguide sheets is poor, and the imaging requirement of the overlapped lenses is difficult to meet; according to the method, the detailed size distribution of the granularity standard substance and the size tolerance of particles actually playing a role in superposition are obtained through statistical analysis, so that the problem that the parallelism between the superposed optical waveguide sheets is poor due to the fact that the granularity standard substance precision is low and the granularity standard substance precision is not matched with the superposition precision is solved, and the imaging requirement of the superposed optical waveguide sheets is met. Specifically, the diameter of the screened granularity standard substance has a definite tolerance range, and the granularity standard substance playing a role in interval control in the superposition process is a part with positive deviation of tolerance, namely the granularity standard substance 41 of the first type with larger granularity in fig. 2; the second type of particle size standard substance 42 with smaller particle size in fig. 2, which is a part of the negative deviation of the tolerance, cannot be contacted with the upper and lower lamination surfaces at the same time, so that the second type of particle size standard substance does not work in the lamination process, and therefore, only a part of the particle size range with the positive deviation of the tolerance is counted, and the part which actually plays a role in interval control is analyzed according to the counting result, so that the high-precision control of the lamination gap can be realized by adopting the microbeads with lower precision.
Specifically, the main purpose of the present embodiment is to provide a method for controlling lens lamination accuracy based on the result of statistical analysis of the bead particle size, which aims to improve the parallelism between the mating surfaces after lens lamination.
As shown in fig. 1, materials used for lamination are a first optical waveguide sheet 1, a second optical waveguide sheet 2, a binder 3, and a particle size standard substance 4. The flatness requirement of the used waveguide sheet is high, and the flatness directly influences the final superposition precision; in other embodiments, besides the waveguide sheets, the laminated material may be other transparent planar objects, and the lamination process may be that two layers of waveguide sheets are laminated, or that multiple layers of waveguide sheets are laminated.
The binder 3 may be epoxy, polyurethane, polystyrene or acrylic. The particle size standard substance 4 can be resin or silicon dioxide, and the form of the particle size standard substance can be solid microbeads or hollow microbeads.
And mixing the granularity standard substance 4 with the adhesive 3, uniformly coating the mixture on the edges of the first optical waveguide sheet 1 and the second optical waveguide sheet 2, curing, controlling the superposition gap between the two waveguide sheets by using the granularity standard substance 4, and controlling the relative position between the two waveguide sheets by using the adhesive 3.
As shown in fig. 2, the particle size standard substance 4 is optionally screened, a high-precision screen is adopted, and the particle size standard substance with a target diameter is screened through the actions of ultrasonic vibration and swing vibration, wherein the diameter of the particle size standard substance 4 is optionally 10-200 μm, 40 μm is selected in the embodiment, and the tolerance of the particle size is controlled to be plus or minus 2 μm. And photographing the obtained granularity standard substances under an electron microscope, and obtaining the particle sizes of the granularity standard substances by an image recognition method, wherein the number of the photographed granularity standard substances is not less than 2500 in order to ensure that the obtained statistical result is closer to a true value. And (3) carrying out statistical analysis on the particle size of the obtained particle size standard substance, sorting according to the order of the particle sizes from small to large, extracting the last 30% of the sorting result, carrying out independent analysis, and counting the particle size distribution range. When the mixing ratio of the granularity standard substance and the adhesive 3 is 1% -5%, the granularity standard substance of the last 30% can be uniformly distributed to each dispensing area, the part of the granularity standard substance is the part which actually plays a role in interval control in the lamination process, and the tolerance range is the approximate lamination error range.
As shown in table 1, the assembly results were obtained under conditions of constant temperature and humidity at 25 ° and 45% relative humidity without dust:
TABLE 1 Assembly results
The adhesive 3 is UV glue, and the particle size standard substance subjected to statistical analysis is mixed with the UV glue according to the mass fraction of 1% -5%, and the mixing proportion can ensure that the mixture can not cause the phenomenon of needle tube blockage in the dispensing process. Stirring, dispersing and defoaming treatment are realized by adopting a vacuum centrifugal stirring mode, and a mixture which is uniformly mixed and has no bubbles is obtained.
The glue mixed with the granularity standard substance is smeared on the edge of the optical waveguide sheet in a pneumatic dispensing mode, so that the uniform glue outlet amount is ensured, the other layer of optical waveguide sheet to be overlapped is overlapped to the other side, and is cured by an ultraviolet curing lamp, wherein the wave band of the curing lamp is 365nm or 395nm; if the multi-layer optical waveguide sheet is required to be overlapped, continuing to overlap according to the dispensing and curing modes, and overlapping one layer each time until the overlapping is finished. And after the superposition is completed, measuring the film thickness by adopting a distance meter, and verifying the superposition accuracy.
The above description is only a preferred embodiment of the present embodiment, and is not intended to limit the present embodiment, and various modifications and variations can be made to the present embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. An optical waveguide assembly method based on a particle size standard substance, comprising:
carrying out statistical analysis on a plurality of granularity standard substances to obtain the size distribution of the granularity standard substances;
if the size of the particle size standard substances in the preset quantity meets the preset requirement in the size distribution, mixing a plurality of particle size standard substances with the binder according to a preset proportion; otherwise, carrying out statistical analysis on other multiple granularity standard substances until the sizes of the granularity standard substances with preset numbers in the multiple granularity standard substances meet preset requirements;
and fixing the preset relative positions of the two optical waveguide sheets to be overlapped by using an adhesive mixed with the granularity standard substance.
2. The method for assembling an optical waveguide based on a particle size standard substance according to claim 1, wherein the particle size standard substance is resin or silica; the particle size standard substance is set as solid beads or hollow beads.
3. The method for assembling an optical waveguide based on a particle size standard substance according to claim 1, wherein the binder is epoxy resin, polyurethane, polystyrene or acrylic resin.
4. The method for assembling an optical waveguide based on a particle size standard substance according to claim 1, wherein the particle size standard substance is mixed with a binder, uniformly coated on edges of two optical waveguide sheets to be laminated and cured; the superposition gap between the two optical waveguide sheets is controlled by the granularity standard substance, and the relative position between the two optical waveguide sheets is controlled by the adhesive.
5. A method of assembling an optical waveguide based on a particle size standard according to claim 1, wherein the particle size standard is mixed with the binder in a proportion of 1% -5%.
6. The method for assembling an optical waveguide based on a particle size standard substance according to claim 5, wherein the particle size standard substance and the binder are subjected to stirring, dispersing and defoaming treatments.
7. The method for assembling an optical waveguide based on a particle size standard substance according to claim 1, wherein a plurality of particle size standard substances are placed in a screen, and the particle size standard substances conforming to a preset target diameter are screened out by ultrasonic vibration and oscillation vibration.
8. The method for assembling an optical waveguide based on a particle size standard substance according to claim 7, wherein the plurality of particle size standard substances are statistically analyzed, sorted in order of particle size from smaller to larger, and the last 30% of the sorted result is extracted for individual analysis, and if the particle size of the last 30% of the particle size standard substance meets the particle size requirement, the plurality of particle size standard substances and the binder are mixed according to a preset ratio.
9. The method for assembling an optical waveguide based on a particle size standard substance according to claim 7, wherein an image of the particle size standard substance is obtained, and the diameter of the particle size standard substance is obtained by an image recognition method.
10. A method of assembling an optical waveguide based on a particle size standard according to claim 1, wherein the adhesive is UV glue.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090220742A1 (en) * | 2008-02-29 | 2009-09-03 | Eternal Chemical Co., Ltd., | Brightness enhancement reflective film |
| CN112965254A (en) * | 2021-03-31 | 2021-06-15 | 歌尔股份有限公司 | Optical waveguide lens overlapping structure and manufacturing method thereof |
| CN113933990A (en) * | 2020-07-13 | 2022-01-14 | 宁波舜宇光电信息有限公司 | Near-eye display device, optical structure suitable for near-eye display device and assembling method thereof |
| CN113933992A (en) * | 2020-07-14 | 2022-01-14 | 宁波舜宇光电信息有限公司 | Near-to-eye display device, optical structure and wafer-level preparation method thereof |
| CN115291387A (en) * | 2022-04-29 | 2022-11-04 | 舜宇奥来半导体光电(上海)有限公司 | Optical waveguide structure and optical waveguide module |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090220742A1 (en) * | 2008-02-29 | 2009-09-03 | Eternal Chemical Co., Ltd., | Brightness enhancement reflective film |
| CN113933990A (en) * | 2020-07-13 | 2022-01-14 | 宁波舜宇光电信息有限公司 | Near-eye display device, optical structure suitable for near-eye display device and assembling method thereof |
| WO2022012244A1 (en) * | 2020-07-13 | 2022-01-20 | 宁波舜宇光电信息有限公司 | Near-eye display device, optical structure suitable for near-eye display device, and assembly method for optical structure |
| CN113933992A (en) * | 2020-07-14 | 2022-01-14 | 宁波舜宇光电信息有限公司 | Near-to-eye display device, optical structure and wafer-level preparation method thereof |
| WO2022012245A1 (en) * | 2020-07-14 | 2022-01-20 | 宁波舜宇光电信息有限公司 | Near-eye display device, optical structure, and wafer-level preparation method therefor |
| CN112965254A (en) * | 2021-03-31 | 2021-06-15 | 歌尔股份有限公司 | Optical waveguide lens overlapping structure and manufacturing method thereof |
| CN115291387A (en) * | 2022-04-29 | 2022-11-04 | 舜宇奥来半导体光电(上海)有限公司 | Optical waveguide structure and optical waveguide module |
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