CN106291940B - A kind of design of virtual reality goggles and manufacturing method - Google Patents
A kind of design of virtual reality goggles and manufacturing method Download PDFInfo
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- CN106291940B CN106291940B CN201610887497.2A CN201610887497A CN106291940B CN 106291940 B CN106291940 B CN 106291940B CN 201610887497 A CN201610887497 A CN 201610887497A CN 106291940 B CN106291940 B CN 106291940B
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- eyepiece
- fresnel
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- planar substrates
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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
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
Abstract
The present invention relates to a kind of design of virtual reality goggles and manufacturing methods, including：Meet the eyepiece aspherical with biconvex of optical performance requirements at 90 ° or so according to design field angle；One surface is changed to planar substrates Fresnel surface, and parameter to planar substrates Fresnel surface and another surface parameter optimize simultaneously, obtain the eyepiece with planar substrates Fresnel surface；The planar substrates of eyepiece are changed to aspheric substrate, to aspheric substrate Surface Parameters, Fresnel tooth parameter and another surface parameter are carried out at the same time optimization thereon, obtain the eyepiece with aspheric substrate Fresnel surface；All crowns of aspheric substrate Fresnel surface in the designed eyepiece with aspheric substrate Fresnel surface are connected to become base curve, and use eyepiece of the injection molding manner batch production with base curve；Single point diamond cutting processing is carried out to the base curve in the eyepiece with base curve of injection formed, removes the base curve fill part because connecting crown.
Description
Technical field
The invention belongs to the technical fields such as virtual reality, augmented reality, eyepiece imaging.
Background technology
Virtual reality (VR, VirtualReality) is that the void of a three dimensions is generated using computer or mobile phone simulation
The quasi- world, provides simulation of the user about sense organs such as vision, the sense of hearings, allows user as on the spot in person, can in time, do not have
The things in three dimensions is observed with limitation.VR glasses are the key tools for realizing virtual reality technology.A VR glasses energy
It is no that user is allowed to have the design and manufacture for feeling to depend primarily on VR eyepieces on the spot in person.Eyepiece focal length gets over short sight times magnification
Rate is bigger, and vision granular sensation is stronger；Focal length is bigger, and enlargement ratio is smaller, then feeling of immersion is poorer.Existing eyepiece product includes mainly
Two kinds of forms, one is double-sized non-spherical eyepiece, another kind is planar substrates Fresnel eyepiece.
With the increase of field of view angle, double aspherical formula eyepiece center thickness and edge thickness differ greatly, so processing
Difficulty increased dramatically, and therefore, double aspherical formula eyepiece field of view angles can only generally accomplish 90 ° or so.Planar substrates Fresnel eyepiece
Appearance solve the problems, such as center and peripheral thickness ratio, field of view angle can accomplish 110 °, but with the increase of field angle,
The curvature of field and coma also can be with increases.The imaging inconsistency of center and peripheral can allow user to feel dizziness.Therefore, it designs
And it manufactures a high performance Fresnel eyepiece and plays an important role in the fields VR are applied.
Invention content
It is an object of the invention to provide a kind of new designs of VR eyepieces and manufacturing method so that the eyepiece made can have big
Field angle avoids center and peripheral thickness than problem, and curvature of field when reducing big field angle and coma, and it is strongly heavy to meet the fields VR
Soak the needs of sense.Technical scheme is as follows：
A kind of design of virtual reality goggles and manufacturing method, include the following steps：
1) according to design requirement, design field angle meets the aspherical with biconvex of optical performance requirements at 90 ° or so
Eyepiece；
2) surface in the eyepiece designed by step 1) is changed to planar substrates Fresnel surface, to increase system field angle
Parameter and another surface parameter to meeting design requirement, and to planar substrates Fresnel surface optimize simultaneously, obtain meeting and set
Count the desired eyepiece with planar substrates Fresnel surface；
3) step 2) design is had plane by the parameter with the aspherical eyepiece of biconvex designed by step 1
The planar substrates of the eyepiece of substrate Fresnel surface are changed to aspheric substrate, to aspheric substrate Surface Parameters, thereon Fresnel tooth
Parameter and another surface parameter are carried out at the same time optimization, obtain the mesh with aspheric substrate Fresnel surface for meeting design requirement
Mirror so that the system curvature of field and coma are reduced；
4) the aspheric substrate Fresnel surface institute in the designed eyepiece with aspheric substrate Fresnel surface is with teeth
Point is connected to become base curve, and uses eyepiece of the injection molding manner batch production with base curve；
5) single point diamond cutting processing is carried out to the base curve in the eyepiece with base curve of injection formed, removed
Because connecting the base curve fill part of crown, final aspheric substrate Fresnel surface is obtained to get to finally with aspheric
The eyepiece of face substrate Fresnel surface.
2. design according to claim 1 and manufacturing method, which is characterized in that the facewidth of Fresnel tooth is according to imaging
Performance preferably, the facewidth such as can be used or wait the high mode of teeth in 20 μm~60 μ ms.
3. design according to claim 1 and manufacturing method, which is characterized in that for further be thinned eyepiece thickness and
Curvature of field when reducing big visual field and coma, planar substrates Fresnel surface or aspheric substrate Fresnel are also changed to by another surface
Face.
Fresnel structure is added in the present invention on the aspheric substrate of VR eyepieces, and the center for being effectively thinned VR eyepieces is thick
Degree, and the curvature of field and coma of big visual field system are reduced, image quality is significantly improved.So that wearer has preferably
Feeling of immersion.Meanwhile proposing the processing method that injection molding is combined with Single point diamond turning o, that is, it ensure that device is inexpensive, big
The production of batch also ensures efficient, high-precision Fresnel structure processing.
Description of the drawings
Fig. 1 aspheric substrate Fresnel VR goggle structure figures
Fig. 2 (a) and (b) are respectively aspheric substrate Fresnel surface after base curve and cutting
The aspherical VR goggle structures figure (scheme one) of Fig. 3 biconvexs
The aspherical VR eyepieces disc of confusion (scheme one) of Fig. 4 biconvexs
The aspherical VR eyepieces curvature of field distortion figure (scheme one) of Fig. 5 biconvexs
Fig. 6 planar Fresnel VR goggle structures figures (scheme two)
Fig. 7 planar Fresnel VR eyepieces figure of optical lens preferred embodiment (scheme two)
Fig. 8 planar Fresnel VR eyepiece curvature of field distortion figures (scheme two)
Fig. 9 aspheric substrate Fresnel VR eyepieces figure of optical lens preferred embodiment (scheme three)
Figure 10 aspheric substrate Fresnel VR eyepiece curvature of field distortion figures (scheme three)
The two-sided Fresnel VR goggle structures figures (scheme four) of Figure 11
The two-sided Fresnel VR eyepieces figure of optical lens preferred embodiment (scheme four) of Figure 12
The two-sided Fresnel VR eyepieces of Figure 13 more curvature of field distortion figure (scheme four)
Specific implementation mode
The image-forming principle of VR eyepieces is the light that pixel is sent out on screen parallel incidence human eye, human eye after eyepiece
When exit pupil position is observed, the image being equivalent on screen is imaged on infinite distant positions.The image of left and right eye observation comes respectively
Two screens, to produce 3D visual effects.If the peripheral field curvature of field and coma of system are excessive, edge imaging is in
The clarity of heart imaging is inconsistent, can cause user dizzy during using VR glasses, to lose big field angle
Meaning.The present invention proposes aspheric substrate Fresnel eyepiece design scheme, can greatly reduce the curvature of field that big field angle is brought and
Coma.
The concrete structure of the present invention is as shown in Figure 1, in one aspherical face of VR eyeglasses of aspheric design or two aspheric
It is superimposed Fresnel tooth on the face of face, i.e., a series of broached-tooth designs in the round diameter directional spreding of device, is on one side vertical aspheric
The vertical edge on face surface, another is the curved surface side with certain curvature, and the spacing between each tooth is tooth pitch.The Fresnel tooth
It is rotarily formed loop configuration in circular, circumferential.There are two types of distribution forms for Fresnel tooth：One kind for etc. the facewidth, generally with curved surface side
The tooth height of edge to central Fresnel tooth can be smaller and smaller；Another kind is high to wait teeth, and this structure is from curved edges to center phenanthrene alunite
You can gradually increase the tooth pitch of tooth.Consider from design and machining angle, the Fresnel tooth of the facewidth such as selection is relatively conventional.
In the design, based on the aspherical eyepiece of the good biconvex of optimization design, first one of surface is changed to put down
Face substrate Fresnel surface increases system field angle, Fresnel planar substrates is then changed to aspheric substrate, final optimization pass Cheng Fei
Spherical substrate Fresnel eyepiece reduces the system curvature of field and coma.Field when for eyepiece thickness is further thinned and reduces big visual field
Bent and coma, can further expand by scheme, another surface is changed to planar substrates Fresnel surface or aspheric substrate is luxuriant and rich with fragrance
The faces Nie Er.In the design, the Fresnel facewidth causes it is important to note that the too small facewidth can bring visual diffraction phenomena
Image blur, while bringing numerous difficulties for processing；And the excessive facewidth is then for imaging performance without too big improvement.Synthesis is examined
Consider, the Fresnel facewidth can be in 20 μm~60 μ ms.In specific implementation, optical design part is easily by with certain experiences
Design engineer completes.
There are mainly two types of forms for the processing of Fresnel tooth：Injection molding and Single point diamond turning o.Injection molding can meet greatly
The needs of batch production inexpensive can in high volume manufacture device, but smaller, toothing has vertically by Fresnel tooth pitch
While the design feature blocked, structure after injection molding is due to contraction distortion, it is difficult to ensure that the high-precision modeling of Fresnel tooth, and
And the Fresnel facewidth is smaller, the face shape washing shrinkage after injection molding is more serious, and surface figure accuracy is also more difficult to guarantee.For proposed by the present invention
Aspheric substrate Fresnel curved surface improves processing surface figure accuracy as possible in the case where ensureing processing efficiency, and the present invention proposes note
It is moulded into the processing method that type is combined with Single point diamond turning o, i.e. injection molding base curve first, then uses single-point diamond
Stone turning mode only processes Fresnel tooth.Wherein base curve is that Fresnel crown is linked to be in aspheric substrate Fresnel surface shape
Face shape, as shown in Figure 2.The base curve being molded fills out the face shape for being filled with Fresnel tooth, therefore, in single-point diamond vehicle
Fill part need to only be removed when the mode of cutting is processed, form the aspheric substrate Fresnel surface finally needed.This processing method is
The low-cost, high-volume production needs of injection molding have been taken into account, while ensure that efficient, high-precision Fresnel structure add
Work.
It is embodied in case, the technical indicator for proposing meter VR eyepieces is mainly：Screen size：5.5 inches, focal length：
38mm, field angle：105 °, operating distance：15mm, exit pupil diameter：10mm.Biconvex non-spherical structure design scheme (scheme one) is such as
Shown in Fig. 3, since the aspherical structure of biconvex is limited, field of view angle can only accomplish 90 °, if angle is big again, the center of lens
Cause injection molding extremely difficult greatly very much with the thickness ratio at edge.A surface in scheme one is modified to planar substrates Fresnel
It optimizes, and increases field of view angle to 105 °, obtain structure chart shown in fig. 6 (scheme two).It is brought to reduce big visual field
The curvature of field and coma, advanced optimize Fresnel substrate, finally obtained aspheric substrate Fresnel eyepiece (scheme three), such as scheme
Shown in 1.To further decrease the thickness ratio of device center and edge, another surface is changed to planar substrates Fresnel, is such as schemed
(scheme four) shown in 11.
The image of the disc of confusion of four schemes is respectively as shown in Fig. 4, Fig. 7, Fig. 9 and Figure 12；Curvature of field figure respectively as Fig. 5,
Shown in Fig. 8, Figure 10 and Figure 13.The magnitude of the main structure parameters of four schemes, maximum/minimum disc of confusion and the curvature of field is aggregated into
In table 1, it can be seen that the scheme of addition aspheric substrate Fresnel surface can simultaneously effective increase field angle, reduce lens
The thickness ratio of center and peripheral reduces the optical parallaxs such as disc of confusion and the curvature of field.
1 each scheme structural parameters of subordinate list, optical performance parameter contrast table
| Scheme | Field angle | Edge thickness | Center thickness | Maximum disc of confusion | Minimum disc of confusion | The curvature of field |
| Scheme one | 90° | 2.0mm | 16.3mm | 305.0um | 107.0um | <5.0mm |
| Scheme two | 105° | 1.8mm | 4.0mm | 227.0um | 88.0um | <5.0mm |
| Scheme three | 105° | 1.8mm | 7.0mm | 183.0um | 69.0um | <2.0mm |
| Scheme four | 105° | 1.8mm | 4.0mm | 184.0um | 62.0um | <2.0mm |
Claims (3)
1. a kind of virtual reality goggles design and manufacturing method, include the following steps：
1) according to design requirement, design field angle meets the eyepiece aspherical with biconvex of optical performance requirements at 90 °；
2) surface in the eyepiece designed by step 1) is changed to planar substrates Fresnel surface, to increase system field angle to symbol
Design requirement is closed, and parameter to planar substrates Fresnel surface and another surface parameter optimize simultaneously, obtains meeting design and want
The eyepiece with planar substrates Fresnel surface asked；
3) step 2) design is had planar substrates by the parameter with the aspherical eyepiece of biconvex designed by step 1)
The planar substrates of the eyepiece of Fresnel surface are changed to aspheric substrate, to aspheric substrate Surface Parameters, Fresnel tooth parameter thereon
And another surface parameter is carried out at the same time optimization, obtains the eyepiece with aspheric substrate Fresnel surface for meeting design requirement,
So that the system curvature of field and coma are reduced；
4) all crowns of aspheric substrate Fresnel surface in the designed eyepiece with aspheric substrate Fresnel surface are connected
It is connected into as basic curved surface, and uses eyepiece of the injection molding manner batch production with base curve；
5) single point diamond cutting processing is carried out to the base curve in the eyepiece with base curve of injection formed, removed because even
The base curve fill part for connecing crown obtains final aspheric substrate Fresnel surface to get to finally with aspheric base
The eyepiece of bottom Fresnel surface.
2. design according to claim 1 and manufacturing method, which is characterized in that the facewidth of Fresnel tooth is according to imaging performance
Selected in 20 μm~60 μ ms, using etc. the facewidth or wait the high mode of teeth.
3. design according to claim 1 and manufacturing method, which is characterized in that for eyepiece thickness and reduction is further thinned
Another surface is also changed to planar substrates Fresnel surface or aspheric substrate Fresnel surface by curvature of field when big visual field and coma.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405820A (en) | 2016-10-14 | 2017-02-15 | 浙江舜宇光学有限公司 | Eye lens |
| CN107263024A (en) * | 2017-05-27 | 2017-10-20 | 中国科学院上海技术物理研究所 | A kind of ray machine integrated mirror part and manufacture method |
| WO2019010938A1 (en) | 2017-07-14 | 2019-01-17 | 浙江舜宇光学有限公司 | Eyepiece and display device comprising same |
| WO2019033284A1 (en) * | 2017-08-15 | 2019-02-21 | 深圳市柔宇科技有限公司 | Head-mounted display device |
| CN107632388B (en) * | 2017-10-24 | 2024-04-02 | 歌尔光学科技有限公司 | Eyepiece and head-mounted display device |
| US20210157035A1 (en) * | 2018-07-24 | 2021-05-27 | Nikon Corporation | Ocular optical system and head mounted display |
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| WO2014073093A1 (en) * | 2012-11-09 | 2014-05-15 | パイオニア株式会社 | Optical element, head-up display, and optical element manufacturing method |
| CN105388609A (en) * | 2015-11-16 | 2016-03-09 | 厦门灵境信息科技有限公司 | Optical eyepiece lens and head-mounted display device |
| CN105511078A (en) * | 2015-12-31 | 2016-04-20 | 北京小鸟看看科技有限公司 | Ocular lens, head-mounted display optical system and head-mounted equipment |
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| US9285591B1 (en) * | 2014-08-29 | 2016-03-15 | Google Inc. | Compact architecture for near-to-eye display system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014073093A1 (en) * | 2012-11-09 | 2014-05-15 | パイオニア株式会社 | Optical element, head-up display, and optical element manufacturing method |
| CN105388609A (en) * | 2015-11-16 | 2016-03-09 | 厦门灵境信息科技有限公司 | Optical eyepiece lens and head-mounted display device |
| CN105511078A (en) * | 2015-12-31 | 2016-04-20 | 北京小鸟看看科技有限公司 | Ocular lens, head-mounted display optical system and head-mounted equipment |
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