CN106405842A - Optical system of virtual reality - Google Patents
Optical system of virtual reality Download PDFInfo
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- CN106405842A CN106405842A CN201611050377.3A CN201611050377A CN106405842A CN 106405842 A CN106405842 A CN 106405842A CN 201611050377 A CN201611050377 A CN 201611050377A CN 106405842 A CN106405842 A CN 106405842A
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- Prior art keywords
- speculum
- optical system
- entrance pupil
- face
- pupil face
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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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The purpose of the application is to provide an optical system of virtual reality. The optical system comprises an entrance pupil plane, a mirror, and a display. The mirror includes a first surface and a second surface, and the first surface is adjacent to the entrance pupil plane. Light emitted by the display is reflected by the first surface of the mirror and then received by the entrance pupil plane. As the optical system uses the mirror, light is reflected by the first surface of the mirror and is not transmitted through the mirror, there is no dispersion, and chromatic aberration is eliminated. Moreover, as the light emitted by the display needs to be received by the entrance pupil plane after being reflected by the first surface of the mirror, the mirror is designed into a tilting structure, and the length of the optical system is shortened effectively.
Description
Technical field
The application is related to optical field, more particularly, to a kind of optical system of virtual reality.
Background technology
Virtual reality (Virtual Reality, VR) be a kind of maximally effective simulation people in natural environment depending on, listen, dynamic
Deng the senior human-computer interaction technology of behavior, participant is made can directly to explore effect in local environment for the virtual objects and change,
Seemingly place oneself in the midst of in virtual real world, produce feeling of immersion, imagine and realize interactivity.With virtual reality technology in military affairs
The extensive application in the various field such as simulation, industrial simulation, digital city, digital entertainment and ecommerce, various in the market
Virtual reality products emerge in an endless stream, and some VR equipment optical systems adopt refractive optical system, camera lens layout such as Fig. 1 at present
Shown, including entrance pupil face 01, refractor 02 and display screen 03, the light sending from display screen needs through refractor, leads to
Superrefraction eyeglass becomes the virtual image, then is received by entrance pupil face, and the length of this refractive optical system is overall longer, and because different ripple
Long light has different refractive indexes, and light enters refractor and has dispersion, thus bringing the optical problem of aberration, affects picture
Matter, poor user experience.
Content of the invention
The purpose of the application is to provide a kind of optical system of virtual reality, to solve refractive optical system in prior art
System length is overall longer and the problem that has aberration to affect image quality.
One side according to the application, there is provided a kind of optical system of virtual reality device is it is characterised in that include
Entrance pupil face, speculum and display screen, wherein, described speculum includes first surface and second surface, described first surface and institute
State that entrance pupil face is adjacent, the light that described display screen sends after the first surface of described speculum reflects, by described entrance pupil face
Receive.
Further, in above-mentioned optical system, described second surface scribbles base material.
Further, in above-mentioned optical system, described first surface scribbles reflectance coating.
Further, in above-mentioned optical system, the axis of described speculum is more than or equal to 45 with the optical axis included angle in entrance pupil face
Degree, described display screen is installed on the vertical direction of described speculum and is more than or equal to 20 with the angle of the axis of described speculum
Degree.
Further, in above-mentioned optical system, the horizontal field of view angle in described entrance pupil face is 100 degree and vertical field of view angle is 40
Degree.
Further, in above-mentioned optical system, the distance between center of described entrance pupil face and described speculum is more than etc.
Beeline between 30mm, described entrance pupil face and described speculum is more than or equal to 15mm.
Further, in above-mentioned optical system, the first surface of described speculum is free form surface.
Further, in above-mentioned optical system, the first surface of described speculum is aspherical.
Further, the first surface of described speculum is rotational symmetric aspheric.
Further, the first surface of described speculum is polynomial surface.
Further, the surface configuration of the first surface of described speculum meets below equation：
Wherein, z represents horizontal coordinate, and r represents the base radius on surface, and k represents circular cone coefficient, AiRepresentative polynomial coefficient, c
Represent the inverse of base radius, Ei(x, y) represents the polynomial expression formula of described first surface corresponding face type, and N represents multinomial
Formula maxitem, i=1,2 ... N.
Compared with prior art, the optical system of herein described virtual reality, including entrance pupil face, speculum and display
Screen, wherein, described speculum includes first surface and second surface, and described first surface is adjacent with described entrance pupil face, described aobvious
The light that display screen sends, after the first surface of described speculum reflects, is received by described entrance pupil face, using the light of speculum
System makes light reflect in the first surface of speculum, does not pass through speculum, thus without there being dispersion, eliminates
Aberration；Meanwhile, because needing to meet the light that display screen sends after the first surface reflection of described speculum by described entrance pupil
Face receives, and therefore design speculum is tilting, effectively shortens the length of optical system.
Further, scribble reflectance coating on the first surface of speculum in this application so that reflection occurs in speculum
Surface, compared to refractive optical system, light will not pass through speculum, thus eliminating aberration.In addition, reflectance coating has
High reflectance, so that the light being sent by display screen is more reflected onto entrance pupil face, increases the brightness of display, high reflection simultaneously
Veiling glare can be eliminated and color of image distortion is little, improve the quality of imaging.
Further, the angle between the optical axis in the axis of speculum and entrance pupil face is more than or equal to 45 degree in this application,
Display screen is installed on the vertical direction of described speculum and the angle and the axis of described speculum between is more than or equal to 20 degree,
So ensure that display screen has enough installing spaces and position on the crown wearing user, by tilt the speculum installed and
Display screen, the sized fraction of optical system length direction is transferred on vertical direction, can effectively reduce the length of optical system
Degree, makes more compact structure.
Further, the distance between center of entrance pupil face and speculum is more than or equal to 30mm, entrance pupil face in this application
Beeline and speculum between be more than or equal to 15mm, with ensure speculum will not with wear user nose interfere.
Further, in the application, the face type of the first surface of speculum selects more multiple, can be free form surface, non-
Any one in sphere and polynomial surface, wherein, free form surface has more frees degree, can preferably balance aberration；Non-
The sphere free degree is few, more preferably processes with respect to free form surface, and aspherical preferably rotational symmetric aspheric, advantageously in eyeglass
Processing, measurement and assembling, and non-spherical reflector is compared to spherical reflector and can preferably correct optical aberration；Many
Formula curved surface can be rotational symmetric can also be non-rotationally-symmetric.
Further, in the application, the angle of visual field is larger, and horizontal field of view angle is 100 degree, and vertical field of view angle is 40 degree, larger
The angle of visual field can be closer to wear the angle of eyes of user, and the imaging watched is more true to nature, increased immersing of VR equipment
Sense.
Brief description
By reading the detailed description that non-limiting example is made made with reference to the following drawings, other of the application
Feature, objects and advantages will become more apparent upon：
Fig. 1 illustrates the camera lens layout of refractive optical system in prior art；
Fig. 2 illustrates a kind of camera lens layout of the optical system of virtual reality of the application one side；
Fig. 3 illustrates the schematic diagram according to the camera lens resolving power of optical system in the application one embodiment；
Fig. 4 illustrates the schematic diagram according to the camera lens aberration of optical system in the application one embodiment.
In accompanying drawing, same or analogous reference represents same or analogous part.
Specific embodiment
Below in conjunction with the accompanying drawings the application is described in further detail.
A kind of one side according to the application, there is provided optical system, as shown in Figure 2 according to the application on one side
A kind of optical system camera lens layout, including entrance pupil face 1, speculum 2 and display screen 3, wherein, described speculum 2 includes
First surface 21 and second surface 22, described first surface 21 is adjacent with described entrance pupil face 1, the light that described display screen 3 sends
After the first surface 21 of described speculum 2 reflects, received by described entrance pupil face 1, the optical system using speculum makes
Light reflects in the first surface of speculum, does not pass through speculum, thus without there being dispersion, eliminates aberration, meanwhile,
The light sending because needing to meet display screen 3 is connect by described entrance pupil face 1 after first surface 21 reflection of described speculum 2
Receive, therefore design speculum 2 is tilting, effectively shortens the length of optical system.
Alternatively, described second surface 22 scribbles base material.Because the reflection of speculum 2 is located against the table of base material
The effect of face plated film, substrate can be any shapes such as plane, curved surface, simultaneously substrate can also be any be easy to injection mo(u)lding and
The material of plated film, any thickness, for example, base material can be acrylic (PMMA), Merlon (Polycarb), polyethylene
Deng.
Alternatively, described first surface 21 scribbles reflectance coating.Here, reflectance coating is scribbled on first surface 21 making to reflect
Occur on the surface of speculum, compared to refractive optical system, light will not pass through speculum, thus eliminating aberration.The
The reflectance coating that one surface 21 is applied has high reflectance so that the light being sent by display screen 3 is more reflected onto entrance pupil face
1, increase the brightness of display, high reflection can eliminate veiling glare and color of image distortion is little simultaneously, improve the quality of imaging.
In the application one embodiment, with continued reference to Fig. 2, entrance pupil face 1 in described optical system, speculum 2 and display screen 3
Meet following condition installing：Angle between the axis 23 of speculum 2 and the optical axis 11 in entrance pupil face 1 is more than or equal to 45 degree,
Display screen 3 is installed on the vertical direction of described speculum 2 and the angle and the axis 23 of described speculum 2 between is more than or equal to
20 degree, so ensure that display screen 3 wear user the crown have enough installing spaces and position, by tilt install anti-
Penetrate mirror and display screen, the sized fraction of optical system length direction is transferred on vertical direction, can effectively reduce optical system
The length of system, makes more compact structure, is applied in virtual reality device so that the novel appearance of the virtual reality device of entirety.
In the application one embodiment, the distance between center of entrance pupil face 1 and speculum 2 is more than or equal to 30mm, entrance pupil face 1
Beeline and speculum 2 between is more than or equal to 15mm, to ensure that speculum 2 will not be dry with the nose generation wearing user
Relate to.
Alternatively, the first surface 21 of described speculum 2 can be appointing in free form surface, aspherical and polynomial surface
One kind, wherein, free form surface has more frees degree, can preferably balance aberration；Non-spherical free degree is few, with respect to freedom
Curved surface is more preferably processed, aspherical preferably rotational symmetric aspheric, advantageously in the processing of eyeglass, measures and assembles, non-
The property of sphere determines speculum and is compared to spherical reflector can preferably correct optical aberration；Each on polynomial surface
Point position coordinates meet polynomial equation, can be rotational symmetric can also be non-rotationally-symmetric.
In the application one embodiment, the surface configuration of the first surface of described speculum meets below equation：
Wherein, z represents horizontal coordinate, and r represents the base radius on surface, and k represents circular cone coefficient, AiRepresentative polynomial coefficient, c
Represent the inverse of base radius, Ei(x, y) represents the polynomial expression formula of described first surface corresponding face type, and N represents multinomial
Formula maxitem, i=1,2 ... N.According to coefficient r, AiAnd multinomial EiThe determination of (x, y) etc. is determined in mirror surface
Each point coordinates, and then by the determination of point coordinates each in mirror surface is assured that with the surface shape on this surface
Shape, gradient that can be installed with the face type of the mirror surface being used, speculum etc. is matched so that effectively correcting camera lens
Optical aberration needed for performance, it is ensured that image quality, determines distortion, image space etc., it should be noted that above-mentioned speculum
The equation that surface configuration meets is only the application one preferred embodiment, other speculum tables that are existing or being likely to occur from now on
The equation that face shape meets, is such as applicable to the application, within also should being included in the application protection domain, and here is to quote
Mode is incorporated herein.
In the application one embodiment, the optical system of virtual reality adopts tilting mirror design, meets the camera lens of Fig. 2
The situation of layout, speculum 2 first surface 21 adopts free form surface, and this optical system parameter is as shown in table 1：
| Entry pupil diameters | 4mm |
| Distance of exit pupil | >30mm |
| Horizontal field of view angle | 100 degree |
| Vertical field of view angle | 40 degree |
| Screen size | >2.5 it is very little |
| Wave band | R,G,B |
Table 1
As shown in Table 1, optical system described herein has larger Entry pupil diameters and distance of exit pupil, and wherein, entrance pupil is straight
Footpath is 4mm, and distance of exit pupil is more than 30mm so that physiologically more comfortable during user's viewing；The angle of visual field is larger, and horizontal field of view angle is
100 degree, vertical field of view angle is 40 degree, and wide-angle can be closer to wear the angle of eyes of user, and the image seen more is forced
Very, increased the feeling of immersion of VR equipment.It should be noted that installing speculum 2 and during display screen 3, speculum axis with enter
Angle between the optical axis of pupil face, and the angle between speculum axis and display screen can change the angle of visual field, the level in table 1 regards
Rink corner and vertical field of view angle are that the angle meeting between speculum axis and entrance pupil face optical axis is more than or equal to 45 degree, speculum axis
Angle and display screen between is reached under conditions of being more than or equal to 20 degree.The size of display screen elect as more than 2.5 cun be with
Horizontal field of view angle in table 1 and vertical field of view angle match, and select corresponding angle of visual field during relatively small display screen also can become
Little.Wave band in table 1 elects R as, G, B be three primary colors, other photochromic can be by R, G, B mix, and meanwhile, this is also this Shen
Please in embodiment the display screen luminescence unit of optical system color.
It should be noted that each value is all only system in the design of tilting reflective optical system in above-described embodiment table 1
The citing of parameter, other systematic parameters that are existing or being likely to occur from now on, such as it is applicable to the application, also should be included in this Shen
Please be within protection domain, and here is incorporated herein with way of reference.
In the application one specific embodiment, under conditions of each parameter in meeting above-mentioned table 1, meet above-mentioned speculum simultaneously
First surface face type formulaOther characteristics of this optical system such as table 2：
Table 2
Those skilled in the art will be understood that optical design is formed according to certain sequential combination by face one by one,
In optical system described herein, in table 2, sequence number correspondence in face illustrates each face characteristic, and wherein, standard type refers to sphere, plane etc.
Conventional face type, coordinate breakpoint is commonly used in the optical system of inclination for rotating, and represents the Virtual table of pitch system coordinate system
Face, face sequence number 3 extension multinomial face is free form surface, is the face type of the first surface of speculum.
It should be noted that each value is all only each face in the design of tilting reflective optical system in above-described embodiment table 2
The citing of the value of the corresponding characteristic of sequence number, other each face sequence numbers that are existing or being likely to occur from now on correspond to the value of characteristic, such as can fit
For the application, within also should being included in the application protection domain, and here is incorporated herein with way of reference.
In above-mentioned specific embodiment, when the greatest coefficient N in the type formula of speculum first surface face takes 100, normalization
When coefficient value is 2, the multinomial coefficient A in the type formula of first surface faceiValue as follows：
It should be noted that XiYj representative polynomial coefficient Ai, Xi represents the i power of X-coordinate, and Yi represents j time of Y-coordinate
Side, wherein, A1Contain two X1Y0 and X0Y1, A2Contain 3：X1Y0, X1Y1 and X0Y1, A3Contain 4：X1Y0、
X2Y1, X1Y2 and X0Y1, high-order the like.
In the application specific embodiment, by the determination of above-mentioned each multinomial coefficient, obtain optics described herein
The camera lens resolving power of system as shown in figure 3, wherein, transverse axis representation space frequency, unit line is to representing black and white in the range of 1mm
Demand pairs, the longitudinal axis represents the mtf value under this spatial frequency, and scope is 0～1, represents the resolving power of camera lens, and T represents visual field footpath
To resolving power, S represents the resolving power with radial direction vertical direction.
By the speculum 2 in optical system is carried out with above-mentioned design, aberration such as Fig. 4 of described optical system lens
Shown, wherein, abscissa represents distance, and unit is micron, and ordinate represents that different wave length light is on imaging surface 4 when visual field
Position, with respect to the range difference of reference wavelength light, represents the separate degree of the light of different wave length under different visual fields, different wave length
On imaging surface 4, position is got over and is concentrated, and after imaging, effect is better.R can be seen by Fig. 4, G, B three coloured light is overlapped with Y-axis, this reflection
Formula optical system no color differnece generation.
It should be noted that the value of multinomial coefficient is only for example in above-described embodiment, other are existing or from now on may
The value of the multinomial coefficient occurring, is such as applicable to the application, within also should being included in the application protection domain, and here is to draw
It is incorporated herein with mode.
In sum, speculum 2 and display screen 3 are installed relative dip angle, the face type of speculum 2 first surface 21,
Design of optical system parameter etc. can affect the image quality of final camera lens, resolving power, aberration, and this optical system is using tilting
Formula speculum effectively reduces the entire length of VR equipment so that tying compared to refractive optical system of the prior art design
Structure is more compact and eliminates aberration, thus image quality is good, brings more preferable feeling of immersion to user, lifts Consumer's Experience.Work as void
The optical system intending reality meets following condition：The axis of speculum is more than or equal to 45 degree with the optical axis included angle in entrance pupil face, described
When display screen is installed on the vertical direction of described speculum and is more than or equal to 20 degree with the angle of the axis of described speculum, protect
Having demonstrate,proved display screen has enough installing spaces and position on the crown of VR equipment wearing user；In addition, entrance pupil face and speculum
The distance between center is more than or equal to 30mm, and the beeline between entrance pupil face and speculum is more than or equal to 15mm, effectively prevents
Wear the interference that the nose of user is occurred with speculum.
Above in conjunction with accompanying drawing, exemplary description is carried out to optical system described herein it is clear that described herein
The realization of optical system is not subject to the restrictions described above, as long as employing method design and the skill of herein described optical system
The various improvement that art scheme is carried out, or the not improved design by optical system described herein and technical scheme directly apply
In other occasions, all in the protection domain of the application.
It is obvious to a person skilled in the art that the application is not limited to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of spirit herein or essential characteristic, the application can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present application is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the application.Any reference in claim should not be considered as limiting involved claim.This
Outward it is clear that " inclusion " one word is not excluded for other units or step, odd number is not excluded for plural number.In device claim, statement is multiple
Unit or device can also be realized by software or hardware by a unit or device.The first, the second grade word is used for table
Show title, and be not offered as any specific order.
Claims (11)
1. a kind of optical system of virtual reality device is it is characterised in that include entrance pupil face, speculum and display screen, wherein, institute
State speculum and include first surface and second surface, described first surface is adjacent with described entrance pupil face, and described display screen sends
Light, after the first surface of described speculum reflects, is received by described entrance pupil face.
2. optical system according to claim 1 is it is characterised in that scribble base material on described second surface.
3. optical system according to claim 1 and 2 is it is characterised in that scribble reflectance coating on described first surface.
4. optical system according to claim 1 is it is characterised in that the light axle clamp in the axis of described speculum and entrance pupil face
Angle is more than or equal to 45 degree, and described display screen is installed on the vertical direction of described speculum and the folder with the axis of described speculum
Angle is more than or equal to 20 degree.
5. optical system according to claim 4 it is characterised in that described entrance pupil face horizontal field of view angle be 100 degree and
Vertical field of view angle is 40 degree.
6. optical system according to claim 1 is it is characterised in that between described entrance pupil face and the center of described speculum
Distance be more than or equal to 30mm, the beeline between described entrance pupil face and described speculum be more than or equal to 15mm.
7. optical system according to claim 1 is it is characterised in that the first surface of described speculum is free form surface.
8. optical system according to claim 1 is it is characterised in that the first surface of described speculum is aspherical.
9. optical system according to claim 8 is it is characterised in that the first surface of described speculum is rotationally symmetrical non-
Sphere.
10. optical system according to claim 1 is it is characterised in that the first surface of described speculum is multinomial song
Face.
11. optical systems according to any one of claim 7 to 10 are it is characterised in that the first surface of described speculum
Surface configuration meet below equation：
Wherein, z represents horizontal coordinate, and r represents the base radius on surface, and k represents circular cone coefficient, AiRepresentative polynomial coefficient, c represents
The inverse of base radius, Ei(x, y) represents the polynomial expression formula of described first surface corresponding face type, and N representative polynomial is
Big item number, i=1,2 ... N.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611050377.3A CN106405842A (en) | 2016-11-24 | 2016-11-24 | Optical system of virtual reality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611050377.3A CN106405842A (en) | 2016-11-24 | 2016-11-24 | Optical system of virtual reality |
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| Publication Number | Publication Date |
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| CN106405842A true CN106405842A (en) | 2017-02-15 |
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ID=58082667
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611050377.3A Pending CN106405842A (en) | 2016-11-24 | 2016-11-24 | Optical system of virtual reality |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665624A (en) * | 2019-03-06 | 2020-09-15 | 厦门雅迅网络股份有限公司 | HUD optical system |
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| US20040057138A1 (en) * | 2002-09-25 | 2004-03-25 | Minolta Co., Ltd. | Optical system and display apparatus |
| US20070236800A1 (en) * | 2006-03-03 | 2007-10-11 | Ozan Cakmakci | Imaging systems for eyeglass-based display devices |
| WO2010047212A1 (en) * | 2008-10-20 | 2010-04-29 | コニカミノルタオプト株式会社 | Video display device |
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| CN111665624A (en) * | 2019-03-06 | 2020-09-15 | 厦门雅迅网络股份有限公司 | HUD optical system |
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Effective date of registration: 20190428 Address after: 200030 Room 3178, 3rd floor, 2879 Longteng Avenue, Xuhui District, Shanghai Applicant after: Shanghai Whale Investment Management Co., Ltd. Address before: Room 305, Room 4 # 3145, 509 Ganghui Road, Nanhui New Town, Pudong New Area, Shanghai, 20106 Applicant before: Shanghai Le Wo Information technology company limited |
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Application publication date: 20170215 |