CN113933991A - Optical waveguide assembly method in AR device and AR device - Google Patents
Optical waveguide assembly method in AR device and AR deviceDownload PDFInfo
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- CN113933991A CN113933991ACN202010672434.1ACN202010672434ACN113933991ACN 113933991 ACN113933991 ACN 113933991ACN 202010672434 ACN202010672434 ACN 202010672434ACN 113933991 ACN113933991 ACN 113933991A
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- 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
- G02B27/0176—Head mounted characterised by mechanical features
- 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
- 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
- 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
- G02B27/0149—Head-up displays characterised by mechanical features
- G02B2027/0161—Head-up displays characterised by mechanical features characterised by the relative positioning of the constitutive elements
- 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
- G02B27/0149—Head-up displays characterised by mechanical features
- G02B2027/0169—Supporting or connecting means other than the external walls
- 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
- G02B2027/0178—Eyeglass type
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- Optical Couplings Of Light Guides (AREA)
Abstract
Description
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to an optical waveguide assembly assembling method in an AR apparatus and an AR apparatus.
Background
Compared with Virtual Reality (VR) technology, Augmented Reality (AR) technology can construct a Virtual scene based on a real physical environment, thereby bringing a completely new experience to a user, and thus near-eye display devices applying AR technology are receiving increasing attention. The AR technology includes a light source, a scheme of a projection lens and an optical waveguide sheet, and a conventional Birdbath scheme, and for the former scheme, only one optical waveguide sheet is needed before the eyes of a user, so the AR technology is more compact and beautiful, and the user experience is better, and for the latter scheme, the AR technology is difficult to obtain the favor of the user due to reasons of larger volume, difficult further improvement of the field angle, relatively poor experience, and the like.
The optical waveguide sheet projects an image into the optical waveguide sheet through the optical machine, and then the optical waveguide sheet performs two-dimensional pupil expansion on the image, and then the image is projected into human eyes. The image quality projected by the optical machine directly determines the image quality received by human eyes, and the waveguide sheet has an angle requirement on the received light when the two-dimensional pupil expansion is carried out on the image. The prior art generally adopts the traditional single physical alignment mode to determine the relative position between the optical machine and the optical waveguide sheet, the final optical quality is not necessarily optimal, and particularly, the good or optimal optical quality of products produced in batches can not be ensured under the condition of mass production.
The statements in this section are for the purpose of facilitating an understanding of the present application and are not to be assumed to have belonged to the prior art merely by virtue of their inclusion in this section.
Disclosure of Invention
In view of the above, the present invention provides an optical waveguide assembly assembling method in an AR device and an AR device, which can solve or at least alleviate one or more of the above problems and other problems.
First, according to a first aspect of the present invention, there is provided an optical waveguide assembly assembling method in an AR device including a holder, an optical engine, and an optical waveguide, comprising the steps of:
fixedly mounting the optical machine on the bracket;
arranging the optical waveguide to be assembled with respect to the holder with a gap therebetween;
determining whether an outgoing image coupled out of the optical waveguide via the optical engine meets a predetermined image space pose and distortion tolerance criteria: if not, adjusting the relative position between the optical waveguide and the support until the optical waveguide and the support are matched; if so, determining and maintaining a current relative position between the optical waveguide and the support; and
fixing the current relative position at least by applying glue within at least a portion of the gap, thereby securing the optical waveguide to the bracket.
In the optical waveguide fitting assembling method in the AR device according to the present invention, optionally, the holder is provided with an accommodating space into which the optical waveguide to be fitted is partially inserted, and then the current relative position is determined by performing an adjusting operation on the position of the optical waveguide within the accommodating space.
In the optical waveguide fitting assembling method in the AR device according to the present invention, optionally, the gap is set to 0.25mm to 1mm, which is preferably 0.55 mm.
In the optical waveguide fitting assembling method in the AR device according to the present invention, optionally, the preset image space orientation and distortion tolerance criteria include: whether the emergent image received by the image receiving device is aligned with a preset reference image in the image receiving device or not, wherein the preset reference image comprises a cross image.
In the optical waveguide fitting assembling method in the AR device according to the present invention, optionally, the preset image space orientation and distortion tolerance criterion further includes: whether the brightness of the received emergent image meets a preset image brightness uniformity standard or not.
Secondly, as an alternative, according to a second aspect of the present invention, there is also provided an optical waveguide assembling method in an AR apparatus including a holder, an optical engine, and an optical waveguide, comprising the steps of:
fixedly mounting the optical machine on the bracket;
arranging the optical waveguide to be assembled with respect to the holder with a gap therebetween;
aligning the optical waveguide and the holder based on corresponding identifiers for positional matching therebetween to determine and maintain a current relative position between the optical waveguide and the holder; and
fixing the current relative position at least by applying glue within at least a portion of the gap, thereby securing the optical waveguide to the bracket.
In the optical waveguide fitting assembling method in the AR device according to the present invention, optionally, the holder is provided with an accommodating space, the corresponding identification parts include first and second identification parts provided on the optical waveguide and the holder respectively in matching, the optical waveguide to be assembled is partially inserted into the accommodating space, and then the current relative position is determined and held by performing a positioning operation on the optical waveguide and the holder based on the first and second identification parts.
In the optical waveguide member assembling method in the AR device according to the present invention, optionally, the gap is set to 30 μm to 50 μm.
Further, in the optical waveguide assembling method in the AR device according to the present invention as described above, optionally, a glue dispensing area is provided on at least one side of the optical waveguide, one or more through holes corresponding to the glue dispensing area are provided on the holder, and after the current relative position is determined, the current relative position is fixed by applying glue to the glue dispensing area via the through holes and the gap.
In the above-described optical waveguide fitting assembling method in an AR device according to the present invention, optionally, the holder is configured to have:
the glue overflow part is communicated with the gap and is used for accommodating the glue overflowing from the gap;
an anti-overflow portion provided at an edge of the holder for preventing the adhesive from overflowing from the gap onto the optical waveguide; and/or
And an adhesion enhancing part which is provided on a surface of the holder opposed to the optical waveguide, and which increases a contact area of the adhesive between the holder and the optical waveguide.
In the above-mentioned optical waveguide assembling method in an AR device according to the present invention, optionally, the glue overflow portion is configured in a groove shape, and/or an outer contour shape of the adhesion enhancing portion includes a continuous protrusion shape including a rectangle, a triangle, a circular arc, or a combination thereof.
In the above-mentioned method for assembling an optical waveguide in an AR device according to the present invention, optionally, the support is constructed in a split type including a first portion and at least one second portion independent from each other, the first portion being connected to the optical engine and the optical waveguide, the second portion being connected to at least the optical waveguide, the first portion and the second portion being respectively located at both sides of the optical waveguide and spaced apart from the optical waveguide by a first gap and a second gap, respectively, the first gap and the second gap being equal or different.
In the optical waveguide assembling method in the AR device according to the present invention described above, optionally, the opto-engine and the optical waveguide are both arranged in parallel or perpendicularly, and/or the opto-engine is arranged to be located on the same side or on a different side of the optical waveguide from a receiving position of an outgoing image coupled out of the optical waveguide therethrough.
In the above-described optical waveguide piece assembling method in an AR device according to the present invention, optionally, further comprising the steps of:
one or more prisms are mounted in the AR device and disposed between the opto-engine and the optical waveguide for causing light output by the opto-engine to be refracted through the prisms and then coupled into the optical waveguide.
In the above-mentioned method for assembling an optical waveguide in an AR device according to the present invention, optionally, the optical engine and the bracket are relatively positioned by a limiting structure, and the relative position between the optical engine and the bracket is fixed by at least applying glue.
In the above-mentioned optical waveguide assembling method in the AR device according to the present invention, optionally, the position limiting structure includes a step bearing surface and a positioning hole provided on the optical engine and/or the bracket, and/or a glue dispensing area is provided on the bracket, and the relative position between the optical engine and the bracket is fixed by applying glue to the glue dispensing area.
Further, according to a third aspect of the present invention, there is provided an AR device including a support, and an optical machine and an optical waveguide connected to the support, with a gap provided between the optical waveguide and the support, for fixing a current relative position between the optical waveguide and the support by applying glue at least in a part of the gap, the current relative position being determined such that an outgoing image coupled out of the optical waveguide via the optical machine meets a preset image space posture and distortion tolerance standard, based on the current relative position determined at the time of assembly.
In the AR device according to the present invention, optionally, the holder is provided with an accommodating space for partially inserting the optical waveguide into the accommodating space when the optical waveguide is assembled, and then the current relative position is determined by performing an adjusting operation on the position of the optical waveguide within the accommodating space; or
The holder is provided with an accommodating space, and the optical waveguide and the holder are respectively provided with a first identification part and a second identification part for positioning matching, so that the optical waveguide is partially inserted into the accommodating space when being assembled, and then the current relative position is determined by performing an alignment operation on the optical waveguide and the holder based on the first identification part and the second identification part.
In the AR device according to the invention, optionally, in the adjustment mode of operation, the gap is set to 0.25mm-1mm, preferably 0.55 mm; alternatively, in the alignment mode of operation, the gap is set to 30 μm to 50 μm.
In the AR device according to the present invention, optionally, the preset image space pose and distortion tolerance criteria include: whether the emergent image received by the image receiving device is aligned with a preset reference image in the image receiving device or not, wherein the preset reference image comprises a cross image.
In the AR apparatus according to the present invention, optionally, the preset image space pose and distortion tolerance criteria further include: whether the brightness of the emergent image received by the image receiving device meets a preset image brightness uniformity standard or not.
In the AR device according to the present invention, optionally, at least one side of the optical waveguide is provided with a glue dispensing area, and the bracket is provided with one or more through holes corresponding to the glue dispensing area for fixing the current relative position by applying glue to the glue dispensing area via the through holes and the gap after the current relative position is determined.
In the AR device according to the present invention, optionally, the support is configured to have:
the glue overflow part is communicated with the gap and is used for accommodating the glue overflowing from the gap;
an anti-overflow portion provided at an edge of the holder for preventing the adhesive from overflowing from the gap onto the optical waveguide; and/or
And an adhesion enhancing part which is provided on a surface of the holder opposed to the optical waveguide, and which increases a contact area of the adhesive between the holder and the optical waveguide.
In the AR device according to the present invention, optionally, the glue overflow is configured as a groove, and/or an outer contour shape of the adhesion enhancing part comprises a continuous protrusion shape comprising a rectangle, a triangle, a circular arc, or a combination thereof.
In the AR device according to the present invention, optionally, the support is constructed in a split type including a first portion and at least one second portion independent from each other, the first portion being connected to the optical engine and the optical waveguide, the second portion being connected to at least the optical waveguide, the first portion and the second portion being respectively located at both sides of the optical waveguide and spaced apart from the optical waveguide by a first gap and a second gap, respectively, the first gap and the second gap being equal or different.
In the AR device according to the present invention, optionally, the optical engine is arranged in parallel or perpendicular to both of the optical waveguide and/or the optical engine is arranged to be located on the same side or on the opposite side of the optical waveguide from the receiving position of the exit image.
In the AR device according to the present invention, optionally, the AR device further includes one or more prisms disposed between the optical engine and the optical waveguide, so that the light output from the optical engine is refracted by the prisms and then coupled into the optical waveguide.
In the AR device according to the present invention, optionally, the optical engine and the bracket are relatively positioned by a limiting structure, and the relative position between the optical engine and the bracket is fixed by at least applying glue.
In the AR device according to the present invention, optionally, the limiting structure includes a step bearing surface and a positioning hole provided on the optical machine and/or the bracket, and/or a glue dispensing area is provided on the bracket, and the relative position between the optical machine and the bracket is fixed by applying glue to the glue dispensing area.
The principles, features, characteristics, advantages and the like of various aspects according to the present invention will be clearly understood from the following detailed description taken in conjunction with the accompanying drawings. The optical waveguide device has the advantages of simple structure and process and convenient assembly operation, can ensure that the coupled light and the surface of the optical waveguide device are incident at the optimal angle by carrying out real-time calibration or alignment operation on the optical waveguide device, effectively reduces or eliminates the adverse effects on the imaging quality of the AR device in the aspects of assembly tolerance, grating engraving error, adhesive deformation and the like, improves the efficiency of the optical waveguide device on light transmission, and is beneficial to manufacturing the AR device with higher imaging quality, thereby improving the product competitiveness and the user experience.
Drawings
The present invention will be described in further detail below with reference to the following drawings and examples, but it should be understood that these drawings are merely illustrative for purposes of explanation and are not necessarily drawn to scale.
FIG. 1A is a flow chart of an embodiment of a method of assembling an optical waveguide in an AR device according to the present invention.
FIG. 1B is a flow chart of another embodiment of a method for assembling an optical waveguide in an AR device according to the present invention.
Fig. 2, 3 and 4 are schematic diagrams of two different perspective structures and a schematic diagram of a top view structure of a first embodiment of the AR device according to the present invention.
Fig. 5 is a schematic partial perspective view of an optical engine and a mount in a first embodiment of an AR apparatus according to the present invention.
Fig. 6 and 7 are schematic perspective views of an optical waveguide in a first embodiment of an AR device according to the present invention, respectively, from different side views.
Fig. 8 is a schematic diagram of a partial side view of an optical waveguide and a holder in a first embodiment of an AR device according to the present invention.
Fig. 9 is a schematic partial top view of an optical waveguide and a holder in a first embodiment of an AR device according to the present invention.
Fig. 10 is a partial perspective view of an alternative example of the light engine and carriage of fig. 9.
Fig. 11 to 13 are schematic views for explaining three different examples of performing the collation in the embodiment of the optical waveguide fitting assembling method in the AR device according to the present invention, respectively.
Fig. 14, 15 and 16 are two different perspective views and a top view of a second embodiment of an AR device according to the present invention.
Fig. 17 is a partial perspective view of an optical engine, a prism and a bracket in a second embodiment of the AR device.
Fig. 18 and 19 are schematic perspective views of an optical waveguide in a second embodiment of an AR device according to the present invention, respectively, from different side viewing angles.
Fig. 20, 21 and 22 are two different perspective views and a top view of a third embodiment of the AR device according to the present invention.
Fig. 23 and 24 are a schematic perspective view and a schematic top view of a fourth embodiment of an AR apparatus according to the present invention, respectively.
Detailed Description
First, it should be noted that the method for assembling an optical waveguide member in an AR device according to the present invention, and the steps, composition, structural arrangement, advantages and the like of the AR device will be described below by way of example, however, all descriptions should not be construed as limiting the present invention in any way. In this document, the technical term "connected" encompasses that a certain component is directly connected to another component and/or indirectly connected to another component, and the technical terms "upper", "lower", "right", "left", "vertical", "horizontal" and derivatives thereof should be taken in relation to the orientation in the figures, and it is to be understood that the invention may assume various alternative orientations, and the technical term "substantially" is intended to include insubstantial errors associated with the measurement of the certain quantity, which may include a range of ± 8%, ± 5%, or ± 2%, etc. of the given value.
Furthermore, any single feature described or implicit in an embodiment herein, or shown or implicit in each figure, may still allow any combination or permutation to continue between the features (or their equivalents) without any technical impediment, and thus further embodiments according to the present invention should be considered within the scope of this disclosure. In addition, for the sake of brevity, the same or similar components and features may be labeled only at one or several places in the same drawing, and general matters already known to those skilled in the art, such as various existing assembly tools, industrial cameras, visual alignment equipment, etc. available for use in the AR device assembly process, are not repeated herein.
In fig. 1A and 1B, flow charts of two different embodiments of the method of assembling an optical waveguide in an AR device according to the present invention are given, respectively, in an exemplary manner, and also in fig. 2 to 24, several embodiments of AR devices according to the present invention are shown, by which the solution of the present invention will be described in detail.
Referring first to fig. 1A in conjunction with the AR device embodiments shown in the other figures, in this given embodiment of the method for assembling an optical waveguide, an AR device comprising an optical machine, a holder and an optical waveguide can be made by the following steps:
in step S11, theoptical machine 1 may be first assembled to thebracket 2 so that the two are fixedly connected. In practical applications, the method of the present invention does not impose any limitations on the specific configuration, dimensions, materials used, etc. of the opto-mechanical device 1 and thesupport 2 themselves, nor on the specific manner of how they are assembled together (e.g. screwing, gluing, laser welding, etc. or any combination thereof). By way of example only, reference may be made to fig. 5 or 17, for example, by providing any feasible limiting structure (e.g., thestep bearing surface 26 and thepositioning hole 25 provided on the bracket 2) on theoptical machine 1 and/or theoptical machine 1 for limiting the relative position therebetween during assembly, and then fixing the relative position between theoptical machine 1 and thebracket 2 by any feasible connection means, such as glue already applied in theglue groove 27 on thebracket 2.
Then, in step S12, theoptical waveguides 3 to be assembled may be arranged with respect to theholder 2 such that there is agap 4 therebetween after being arranged. It should be noted that depending on the application, theoptical waveguide 3 may have a gap between only one side thereof and thesupport 2, or may have gaps between both sides and thesupport 2, and the gaps on both sides may be allowed to be equal or different in size from each other according to the application requirements. Unlike the prior art, such clearance is actively provided in the present invention not only to reserve space for theglue 5 used to connect theoptical waveguide 3 and theholder 2 together, but also to provide space for handling during subsequent assembly when adjustment of the relative position between theoptical waveguide 3 and theholder 2 may be required. In the prior art, there may also be a certain gap between the optical waveguide and the holder, which however is entirely passive and is based on mechanical connection considerations, since the applied adhesive material takes up a certain amount of space, otherwise such a gap will be removed. With respect to the gaps in the present invention, a more detailed discussion will follow.
After the preliminary arrangement has formed the relative position between theoptical waveguide 3 and theholder 2, the exit image coupled out of theoptical waveguide 3 by the opto-engine 1 may be judged and analyzed in step S13 to determine whether the arrangement position meets the expected requirements according to the inventive concept, for example, whether the currently obtained exit image meets the preset image space pose and distortion tolerance criteria.
Specifically, theoptical waveguide 3 is usually provided with a coupling-inarea 31, a turning and coupling-out area 32, the coupling-inarea 31 is used to receive the light projected by theoptical engine 1, so that the light can be transmitted and two-dimensionally expanded in theoptical waveguide 3, and the final image light can be emitted after passing through the turning and coupling-out area 32. If the received emergent image is judged not to be in conformity, since thegap 4 has been reserved between theoptical waveguide 3 and thesupport 2 in the previous step, the adjustment operation of the relative position between theoptical waveguide 3 and thesupport 2 can be performed in step S14 by means of the operable space provided by thegap 4 until it can be judged that the current emergent image has been in conformity with the image space posture and distortion tolerance standards after the adjustment. The above adjustment process may be completed by one or two operations, and may take more operations to achieve the target.
On the contrary, once it is determined that the outgoing image has met the image spatial attitude and distortion tolerance criteria, the current relative position between theoptical waveguide 3 and theholder 2 is determined and maintained so that the above relative position can be fixed in the subsequent step.
For the above-mentioned image space pose and distortion tolerance criteria, it can be flexibly selected and set according to various practical application situations. For example, an image receiving device may be used to receive the emergent image and align it with a reference image (e.g., a cross image, dots, etc.) preset in the image receiving device as an image space pose and distortion tolerance criteria during assembly, which is exemplarily illustrated in fig. 11-13.
For example, as shown in fig. 11, after theoptical engine 1 projects a cross image, the image receiving device receives the cross image a' acted by theoptical waveguide 3, and then identifies and determines the relative position between the cross image a and the cross image a in the image receiving device. When the two cross images a 'and a are misaligned (although the two cross images are parallel, there is a distance difference between the centers of the two cross images), the tilt angle of theoptical waveguide 3 can be adjusted to rotate around the Y-axis and the Z-axis (refer to fig. 2 or fig. 3), i.e. the fov (field of view) pointing of the image, which appears as an offset feature of the image in the image receiving device, can be adjusted in the above two degrees of freedom until the above two cross images a' and a are aligned to coincide. It will be appreciated that the cross image described above may be replaced by any suitable other image, for example by the five dot images shown in figure 12 or the five small ten digital images shown in figure 13, etc., the basic adjustment principles of which are the same or similar.
As another example, as an optional case, the above-mentioned image space posture and distortion tolerance standard may further include determining whether a brightness of the emergent image received by the image receiving device meets a preset image brightness uniformity standard. For example, when the brightness of the received outgoing image does not reach the uniform standard, theoptical waveguide 3 may be adjusted to be translated in the Y-axis and Z-axis directions (refer to fig. 2 or fig. 3) until the brightness of the received outgoing image reaches the standard, in which theoptical waveguide 3 is adjusted in four degrees of freedom. With the above optional shading test adjustment operation, a further optimized determination of a better relative position between theoptical waveguide 3 and theholder 2 is possible. For example, as shown in fig. 2, in the specific adjustment operation, the position adjustment may be performed on the YOX plane and the YOZ plane with respect to theoptical waveguide 3 based on the above-mentioned criterion of whether to align, and then the position adjustment may be performed on the Y axis, the X axis, and the Z axis with respect to theoptical waveguide 3 based on the above-mentioned criterion of brightness and darkness to further ensure the uniformity of the brightness. Of course, the image space pose and distortion tolerance criteria are fully allowed to include any other suitable content without departing from the spirit of the present invention.
The image receiving device is typically an industrial camera, the specific parameters of which are selected in relation to the AR device to be manufactured, and by which it is desired to simulate the human eye as much as possible (schematically indicated by thenumeral 7 in fig. 3), such as usually requiring an entrance pupil front, the higher the resolution, the better the angle of view is, the larger the angle of view of the AR device is, the distance between it and the optical waveguide is arranged to be 1cm-2cm (simulated human eye distance), etc.
After the current relative position between theoptical waveguide 3 and thesupport 2 has been determined and maintained by the above steps, it is then possible to fix the current relative position between theoptical waveguide 3 and thesupport 2 in step S15 by, for example, applying glue to a part or all of thegap 4, thereby fixing them together, thus making an AR device in which theoptical machine 1, theoptical waveguide 3 and thesupport 2 have been assembled into one.
Since it is considered that the relative position between the optical waveguide and the holder can be actively adjusted based on the image space posture and the distortion tolerance standard in the above assembling process, so that the incident light can be caused to enter at substantially the optimum angle with respect to the surface of the optical waveguide, which will effectively avoid the problems that the transmission efficiency of the optical waveguide is affected due to the improper angle of the incident light with respect to the surface of the optical waveguide, and the observed emergent image is distorted, etc., the assembled AR device can stably provide an image with high imaging quality.
Moreover, it should be noted that, after a great deal of research, the inventor of the present application found that the AR device and its component parts may have adverse effects on the final imaging quality of the AR device due to factors related to, for example, manufacturing processes, assembling processes, etc., but the industry has not paid sufficient attention to the adverse effects due to the fact that it has been common to all over the world, or even neglects the adverse effects completely.
For example, there are more or less process errors in grating the optical waveguide and assembly tolerances in assembling the optical bench, the optical waveguide and the holder, and the prior art generally relies on process equipment accuracy, manufacturer skill level, etc. to control these errors within a reasonable range as expected, but does not consider the effect of compensating for or eliminating as much as possible adverse factors such as process errors and/or assembly tolerances by actively adjusting the relative position between the optical waveguide and the holder during assembly.
For another example, the inventors have noticed that the adhesive may deform during assembly, and when the deformation is applied to the optical waveguide, the incident light will form an angle deviation when entering the optical waveguide, which may cause distortion of the final projected image when reaching the human eye and reduce the efficiency of the optical waveguide for transmitting light. As previously mentioned, in some embodiments, the adhesive may be applied by providing a gap between both sides of the optical waveguide and the support, so as to effectively balance the effect of adhesive deformation on the optical waveguide, thereby facilitating the incident light to form a proper coupling angle with the surface of the optical waveguide for obtaining the best outgoing image quality.
The general procedure of the steps of the method for assembling an optical waveguide member in an AR device according to the present invention is exemplarily described above by fig. 1A, and it is understood that the present invention allows more implementations according to practical situations without departing from the gist of the present application, and is not intended to be limited only to the method steps discussed above.
For example, in different situations, the adjustment of the position of the optical waveguide relative to the holder may be performed in many possible ways during assembly. For example, in some embodiments, as shown in fig. 2, 14, 20, 23, etc., theholder 2 in the AR apparatus may be configured to have a receivingspace 21 to allow theoptical waveguide 3 to be partially inserted into the receivingspace 21 at the time of assembly, and then a position adjustment operation (e.g., two, three, four, five degrees of freedom may be adjusted, or active calibration may be performed on six degrees of freedom of the Y-axis, X-axis, Z-axis, YOX plane, YOZ plane) may be performed on theoptical waveguide 3 located in the receivingspace 21 to determine an appropriate relative position between it and theholder 2 so as to achieve a desired image space attitude and distortion tolerance standard. When the real-time adjustment and calibration method is adopted, the single-side gap or the double-side gap between the optical waveguide and the support can be optionally set to be 0.25mm-1mm (for example, the gap can be preferably set to be substantially 0.55mm), and when the gap distance is adopted, the problems that the interference between the optical waveguide and the support is possibly caused due to the insufficient reserved adjustment space can be avoided, and meanwhile, the difficult curing caused by the excessive adhesive due to the overlarge gap, the reliability reduction caused by the large shrinkage during curing and the like can be avoided.
In addition, in fig. 1B, general steps of another embodiment of an optical waveguide member assembling method in an AR device according to the present invention are also shown, wherein the same or similar processing steps as in the example of fig. 1A, and the like, may be referred to the foregoing description and are not repeated herein, unless otherwise specified.
First, in step S21, the optical engine may be fixed to the bracket;
then, in step S22, the optical waveguides to be assembled may be arranged with respect to the support with a gap therebetween;
next, in step S23, both the optical waveguide and the holder may be subjected to an alignment operation based on, for example, corresponding identifiers respectively provided on the optical waveguide and the holder for positioning matching therebetween, such an alignment operation may require one, two, or more operations to be performed when actually performed, so that the current relative position therebetween can be determined and maintained thereby;
subsequently, in step S24, the optical waveguide may be mounted to the support by fixing the determined current relative position, for example, by applying glue in a portion or all of the gap between the optical waveguide and the support, thereby completing the assembly of the optical waveguide in the AR device.
With the above method embodiment, as a further illustration, in an alternative case, theholder 2 may be configured to have theaccommodation space 21, and first identification parts (e.g., two or more identification points or the like respectively provided at two opposite corners or the like of the optical waveguide 3) may be provided on theoptical waveguide 3, while second identification parts adapted to the above first identification parts are provided on theholder 2, so that an alignment matching operation between theoptical waveguide 3 and theholder 2 can be achieved by means of these identification parts at the time of assembly. Specifically, after theoptical waveguide 3 to be assembled is partially inserted into theaccommodating space 21 of theholder 2, they may be aligned using a visual alignment device based on the first identification portion on theoptical waveguide 3 and the second identification portion on theholder 2, thereby determining an appropriate relative position between theoptical waveguide 3 and theholder 2 to meet the intended image space posture and distortion tolerance standards. The existing visual alignment equipment generally adopts a plurality of cyclic processes of 'photographing alignment identification, adjustment, …, photographing alignment identification' in the whole alignment process, namely, as long as the alignment between target objects is found to be inaccurate, the previous steps are repeated until the target objects are finally aligned accurately. When the above alignment operation mode is adopted, the single-side gap or the double-side gap between the optical waveguide and the support can be optionally set to be 30 μm-50 μm, and the specific setting value can be selected and set according to specific application situations, which is beneficial to avoiding the undesirable influence on the aspects of interference, reduction of the reliability of installation quality and the like caused by insufficient or excessive gap distance reservation during assembly as described above.
It should be noted that the method of the invention allows for more possible implementations depending on the component composition of the AR device itself. By way of illustration, one ormore prisms 6 may optionally be added between the opto-engine 1 and theoptical waveguide 3 when assembling the AR device, for example as shown in fig. 14-17, so that the light output via the opto-engine 1 is coupled into theoptical waveguide 3 after being refracted by such aprism 6. Alternatively, theprism 6 and thesupport 2 may be pre-attached by any suitable retaining structure and may be secured to thesupport 2 by any suitable means, such as by applying glue in aglue dispensing slot 28. Also for example, during the assembly of the AR device, theoptical engine 1 and theoptical waveguide 3 may be selectively assembled into a vertical arrangement (fig. 2) or may be considered to be arranged in parallel (fig. 14), depending on the actual situation. As a further example, in an alternative case, the method of the invention also allows to arrange thelight engine 1 on the same side of theoptical waveguide 3 as the receiving position of the outgoing image, or on two different sides, respectively.
Furthermore, in some embodiments of the method according to the invention, this is achieved in particular by glue application areas 33 (the particular shape, size and layout etc. of which can be flexibly set as the case may be) provided at suitable positions on one or both sides of theoptical waveguide 3, and one or more through holes 22 (the particular number, shape, size and layout etc. of which can also be selectively set) provided in theholder 2 in correspondence with the above-mentionedglue application areas 33, so that after the suitable relative position between theoptical waveguide 3 and theholder 2 has been determined, theglue 5 can be very conveniently applied to theglue application areas 33 of theoptical waveguide 3 via the throughholes 22 and thegap 4, so that both theoptical waveguide 3 and theholder 2 can be fixed together as described before. In addition, the method of the invention also allows, in some embodiments, the possibility of applying glue from one or both sides, the top and/or the bottom, etc. of the receivingspace 21 communicating with thegap 4. Of course, in other embodiments, it is also possible to combine the sizing operations discussed above.
The present invention allows for a variety of possible structural optimizations of thestent 2 in an AR device in view of facilitating the sizing operation. For example, thebracket 2 may be configured to have the adhesion-enhancedportion 23, theflash portion 24, and/or the spill-proof portion as an alternative. The adhesion-promotingportion 23 may be provided on the surface of theholder 2 opposite to theoptical waveguide 3 so as to increase the contact area of the adhesive 5 therebetween to improve the adhesion force. By way of example, the outer contour of theadhesion enhancing part 23 may be configured to include, but not limited to, for example, continuous triangular/saw-tooth shaped protrusions, rectangular protrusions, circular arc shaped protrusions, or combinations thereof, which are schematically illustrated in fig. 9 and 10. As further shown in fig. 4, etc., theflash 24 is disposed in communication with thegap 4 to accommodate excess adhesive that may overflow from thegap 4. in practice, theflash 24 may be configured as a trough or other suitable shape. It is possible for the spill-proof portion to be provided at the edge of theholder 2 in order to prevent that theglue 5 may spill from thegap 4 onto theoptical waveguide 3, so that contamination of the optical area of theoptical waveguide 3 can be avoided.
Alternatively, it is also possible to construct theholder 2 as a split structure, e.g. as shown in fig. 23-24, i.e. it will comprise abody part 2 and an additional part 2', which is separate from the former and arranged on either side of theoptical waveguide 3 and connected thereto, respectively, at a distance 4' from theoptical waveguide 3 and at adistance 4 from the latter, respectively, which may or may not be equal. Furthermore, it is to be understood that such a design may be very beneficial in certain situations, as for the above-mentioned additional part 2', which in practical applications may be provided in two, three or more at the same time. It should be noted that the additional portion 2' may further be connected to thebody portion 2 by suitable structural connection means, such as screws. By applying the split structure, the double-sided glue distribution can be implemented more conveniently and flexibly, which can effectively balance the influence of the deformation of theviscose glue 5 on theoptical waveguide 3 after the solidification.
With respect to the viscose mentioned throughout the text, the method of the present invention is not particularly limited with respect to its specific kind, curing manner, etc. The adhesive may be any suitable adhesive material, such as UV glue, thermosetting glue, UV thermosetting glue, or other types of adhesive that are cured using natural light or moisture, etc. In addition, in the case where the connection has been achieved using glue, the method of the invention also allows for the additional application of one or more other connection means (such as screwing, magnetic connection, etc.).
As a further aspect which is clearly superior to the prior art, the concept according to the invention also provides an AR device which may comprise an optical guide, a support and an optical waveguide which are assembled into a single body, wherein a gap is provided between the optical waveguide and the support, so that when the optical waveguide is assembled to the support, the appropriate relative position between the optical waveguide and the support can be adjusted and determined, depending on whether an outgoing image coupled out of the optical waveguide via the optical guide already mounted to the support meets image space pose and distortion tolerance criteria, and then fixed at least by applying glue in at least a part of the gap.
Four different AR device embodiments, namelyAR devices optical engine 1 and thesupport 2 are arranged along the X-axis and the Y-axis, respectively, to form a vertical type layout with a double-sided gap between theoptical waveguide 3 and theoptical engine 1; the second embodiment also uses a monolithic structure, but theoptical bench 1 and thesupport 2 are arranged along the Y-axis to form a parallel layout, and theoptical waveguide 3 and theoptical bench 1 have a double-sided gap therebetween; the third embodiment also adopts an integral structure, and theoptical engine 1 and thebracket 2 are respectively arranged along the X axis and the Y axis to form a vertical layout, and theoptical waveguide 3 and theoptical engine 1 only have a single-side gap; the fourth embodiment adopts a split structure, and theoptical bench 1 and thebracket 2 are respectively arranged along the X-axis and the Y-axis to form a vertical layout, and theoptical waveguide 3 and theoptical bench 1 have a double-sided gap. Unless otherwise indicated, features or structures using the same reference numerals in the different embodiments are the same or similar to each other, and since the structural configurations, compositions, assemblies, etc. of the embodiments of the AR apparatus have been described in detail in the foregoing description of the method of the present invention, reference may be made to the detailed description of the corresponding parts directly, which is not repeated herein.
It should be noted that although some existing AR devices also employ adhesive means to assemble the optical waveguide and the holder together and due to the volume of the adhesive agent, they appear to have some gap between the optical waveguide and the holder passively in appearance, as discussed above, these existing AR devices do not pay attention to the fact that the coupling-in light rays are not adjusted to the desired coupling-in angle with the surface of the optical waveguide due to many possible reasons to provide images with high image quality, as in the present invention, and especially under mass production conditions, by inspecting the manufactured existing AR device products, they cannot be mass-produced like the AR devices of the present invention because the coupling-in light rays into the optical waveguide can be realized to form, for example, the optimal coupling-in angle with the surface of the optical waveguide, thereby stably and reliably manufacturing AR devices with high image quality in mass, by performing the above tests, it is possible to find a significant difference between the AR device of the present invention and existing AR devices and to fully appreciate the outstanding advantages of the present invention over the prior art.
The method for assembling an optical waveguide member in an AR device and the AR device according to the present invention are explained in detail above by way of examples only, which are provided only for illustrating the principles of the present invention and the embodiments thereof, and not for limiting the present invention, and those skilled in the art may make various modifications and improvements without departing from the spirit and scope of the present invention. For example, although the AR device generally employs an optical waveguide sheet having a sheet-like structure in many cases, the optical waveguide in the present invention may also be configured in any other suitable manner, such as partially forming bumps or the like. Accordingly, all equivalents are intended to be included within the scope of this invention and defined in the claims which follow.
Claims (18)
Translated fromChinesePriority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011438809.4ACN113933994A (en) | 2020-07-14 | 2020-07-14 | AR device |
| CN202010672434.1ACN113933991A (en) | 2020-07-14 | 2020-07-14 | Optical waveguide assembly method in AR device and AR device |
| CN202011438782.9ACN113933993A (en) | 2020-07-14 | 2020-07-14 | AR device |
| CN202180060909.4ACN116235096A (en) | 2020-07-14 | 2021-07-06 | Optical waveguide assembling method in AR device and AR device |
| PCT/CN2021/104693WO2022012374A1 (en) | 2020-07-14 | 2021-07-06 | Method for assembling optical waveguide in ar device, and ar device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010672434.1ACN113933991A (en) | 2020-07-14 | 2020-07-14 | Optical waveguide assembly method in AR device and AR device |
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| CN202011438809.4ADivisionCN113933994A (en) | 2020-07-14 | 2020-07-14 | AR device |
| CN202011438782.9ADivisionCN113933993A (en) | 2020-07-14 | 2020-07-14 | AR device |
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| CN202010672434.1APendingCN113933991A (en) | 2020-07-14 | 2020-07-14 | Optical waveguide assembly method in AR device and AR device |
| CN202011438782.9APendingCN113933993A (en) | 2020-07-14 | 2020-07-14 | AR device |
| CN202011438809.4APendingCN113933994A (en) | 2020-07-14 | 2020-07-14 | AR device |
| CN202180060909.4APendingCN116235096A (en) | 2020-07-14 | 2021-07-06 | Optical waveguide assembling method in AR device and AR device |
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| CN202011438809.4APendingCN113933994A (en) | 2020-07-14 | 2020-07-14 | AR device |
| CN202180060909.4APendingCN116235096A (en) | 2020-07-14 | 2021-07-06 | Optical waveguide assembling method in AR device and AR device |
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| WO (1) | WO2022012374A1 (en) |
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| CN113933993A (en)* | 2020-07-14 | 2022-01-14 | 宁波舜宇光电信息有限公司 | AR device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113885205B (en)* | 2021-10-07 | 2022-07-26 | 北京蜂巢世纪科技有限公司 | A kind of smart glasses and manufacturing method thereof |
| CN118295094B (en)* | 2024-06-06 | 2024-10-11 | 歌尔股份有限公司 | Pose control method, pose control device and storage medium for optical machine and waveguide sheet |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113933993A (en) | 2022-01-14 |
| CN113933994A (en) | 2022-01-14 |
| CN116235096A (en) | 2023-06-06 |
| WO2022012374A1 (en) | 2022-01-20 |
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