CN107300777A - A kind of imaging system reflected based on double free form surfaces - Google Patents
A kind of imaging system reflected based on double free form surfaces Download PDFInfo
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- CN107300777A CN107300777A CN201710713877.9A CN201710713877A CN107300777A CN 107300777 A CN107300777 A CN 107300777A CN 201710713877 A CN201710713877 A CN 201710713877A CN 107300777 A CN107300777 A CN 107300777A
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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
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0605—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors
- G02B17/0621—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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Abstract
The invention discloses a kind of imaging system reflected based on double free form surfaces, include free form surface one, free form surface two, one projecting lens and image source, free form surface one and free form surface two have semi-transparent semi-reflecting effect to the light of visible light wave range, described image source emits beam after the transmission of projecting lens, incide on free form surface one, free form surface again and again reflects away light, the light that light from outdoor scene light is transmitted and reflected with free form surface one by free form surface two is overlapped, human eye at emergent pupil then observes the image of actual situation superposition.The present invention utilizes two panels sheet type free form surface reflecting surface, maintains the correction ability to virtual image aberration as free curved surface prism；The light of outdoor scene is by there is the two of free air gap thin optical windows to enter human eye simultaneously, it is possible to achieve observation of the human eye to outdoor scene is not almost distorted and aberration, it is no longer necessary to outdoor scene is compensated using compensating prism.
Description
Technical field
The present invention relates to optical design techniques field, more particularly to a kind of imaging system reflected based on double free form surfaces.
Background technology
Augmented reality (Augmented Reality, " AR ") is that one kind produces virtual image using computer system
Information increases the technology that user perceives to real world.It is different from the effect immersed completely that virtual reality technology is reached,
AR technologies are directed to the dummy object for generating computer, image, the information such as word, and be added to real scene, creates a void
The real world combined, and by image recognition, track and registration technology, cloud etc. realizes the interaction of actual situation scene, so that real
Now to " enhancing " of real world.
In recent years, with microelectronics, the continuous progress of the technology such as photoelectron and optical design, script weight weight volume is big
Helmet-type show system, be developing progressively as small power consumption, lightweight, the wearable intelligent glasses system of compact is (also known as
Video eyeglasses), the most important thing as wearable technology.Augmented reality glasses are from being only applied to national defence and aerospace field is fast
The violent application for developing into various industries scene and ordinary consumer.
Augmented reality intelligent glasses system mainly shows source, optical imaging system, positioning sensor system, circuit control by image
Make and connection system, the composition such as Weighting system.With increasingly mature, the current image source of high resolution flat micro-display device
Gradually the miniature plate display device such as LCD, OLED, LCoS and DLP is replaced by from the miniature CRT of early stage.
The performance of optical system not only influences the imaging effect of image source, the also volume with intelligent glasses, weight and uses
Impression etc. has close relationship.Augmented reality glasses often use penetration light path.Wearer is it is seen that image source is passed through
Amplification and the virtual image of lens error correction formation.Virtual image forming 3 meters of remote positions before eyes, wearer can obtain image source simultaneously
The real information of virtual information and outer scene.
Optical system needs to consider the angle of visual field in design, brightness, distance of exit pupil, exit pupil diameter, binocular interpupillary distance, as
The coordination optimization of the parameter such as difference and magnifying power and overall volume weight and cost.Existing light path design scheme is come out of the same industry
See, such as the prismatic reflection formula light path of Google Google-glass, the holographic optical lattice wave of Microsoft's Hololens glasses
Guide path, the laminated array geometry waveguide scheme and the free curved surface prism scheme of Beijing Institute of Technology of Lumus companies of Israel
Deng；While the compact of the optimal and volume weight of optical parametric is realized, with higher difficulty and challenge.
It is complete interior in slab guide element using light using geometry waveguide or the intelligent glasses of holographical wave guide scheme
Reflection and optical grating diffraction effectively reduce the thickness of optical element, but slab guide element can not provide focal power, it is necessary to match somebody with somebody
Complicated relaying light path is closed to use.
In imaging optical system design, optical surface experienced sphere, conical surface (Conic curved surfaces), traditional aspheric
Face, the development course of free form surface, the both at home and abroad research to free form surface have been carried out for many years.With going deep into for research, and
The development of modern processing detection technique by representative of ultraprecision diamond turning technology, free form surface is in imaging optical system
Application advantage constantly embodies, and is increasingly becoming the study hotspot in image optics field.
The nearly eye displaying scheme of free curved surface prism is as follows：The image of micro projection screen passes through freeform optics surface prism
The refraction and total reflection of three free form surfaces realize Co-factor propagation in the virtual scene of human eye front projection with real world object.Due to certainly
There is focal power by curved surface prism itself and higher aberration correction ability, be can be obtained by without using lens by amplification and picture
The virtual image of difference correction.But image formation prism produces notable skew to the light of real scene, causes huge aberration, it is necessary to compensate
Prism is compensated.Compensating prism makes program light path part volume become heavy, limits further lightening.Also,
Because first face of free curved surface prism often uses the design of high-order free form surface, setting for compensating prism below can be caused
The entire field of outdoor scene can not be fully compensated in meter, cause the imaging of outdoor scene not good.
The content of the invention
The object of the invention is exactly that there is provided a kind of imaging reflected based on double free form surfaces in order to make up the defect of prior art
System.
The present invention is achieved by the following technical solutions：
A kind of imaging system reflected based on double free form surfaces, includes free form surface one, free form surface two, a projection
Lens and image source, free form surface one and free form surface two have semi-transparent semi-reflecting effect to the light of visible light wave range, described
Image source emit beam after the transmission of projecting lens, incide on free form surface one, free form surface is anti-by light again and again
It is shot out, the light that the light from outdoor scene light is transmitted and reflected with free form surface one by free form surface two is overlapped,
Human eye at emergent pupil then observes the image of actual situation superposition, and the virtual image formed by image source is located at 3 meters before human eye of position.
Described free form surface one and free form surface two is optical plastic or optical glass, and thickness is no more than 1.5mm.
Two surfaces of described free form surface one, free form surface two and projecting lens are carried out to increase reflection plated film.
The ranges of incidence angles of described free form surface one is 45-60 degree；The ranges of incidence angles of free form surface two is 15-25
Degree.
The surface of the remote emergent pupil of free form surface two adheres to silver halide microcrystal by absorbing process.
Described image source is one kind in LCD, OLED, DLP, LCoS type Micro display element.
Described free form surface one and free form surface two are XY polynomial free curved surfaces, and expression is：
Wherein c is surface curvature；K is secondary aspherical constant；cmnIt is the coefficient of different rank, p is polynomial highest
Power, meets 1≤m+n≤p；Select even power x, it is ensured that symmetry of the face type on YOZ faces.
Described free form surface one and free form surface two are Zernike polynomial free curved surfaces, expression
For：
Wherein Z (x, y) is that Section 1 is Conic curvature portions on the right of the rise amount of optical surface, equal sign, and c is that surface is bent
Rate, k is secondary aspherical constant, and Section 2 is Zernike multinomials, AiIt is Zernike multinomial coefficients, EiIt is Zernike many
Item formula, ρ, θ is the polynomial variables of Zernike respectively.
Described free form surface one and free form surface two are double-curved surface, and its mathematical description equation is as follows：
Wherein, cxIt is radius of curvature of the curved surface in X-Z plane, cyIt is radius of curvature of the curved surface in Y-Z plane, kxIt is
Curved surface is in the quadratic surface coefficient in sagitta of arc direction, kyIt is quadratic surface coefficient of the curved surface in meridian direction, Ai is on Z axis rotation
Symmetrical asphericity coefficient, Bi is rotation asymmetry coefficient.
Current freeform optics surface prism relies primarily on high-accuracy diamond turning techniques and is processed.In process by
There is the face type of three free form surfaces in free curved surface prism, it is necessary to which clamping realizes the processing of three face types for three times successively.It is such
Clamping will introduce the site error than three larger face types repeatedly, and be asked for injection molding method there is also same
Topic.For diamond turning, face type error is easier to ensure that.And two kinds of processing methods can all have larger structure and miss
Difference.
The nearly eye display light path scheme reflected based on double free form surfaces with projecting lens proposed by the invention.Described two
Individual free form surface is to be utilized respectively in diamond turning lathe processing and manufacturing, process to only need to guarantee face type error；By special
The structural mount of door design carrys out the relative position of element in fixed light path.So there is certain assembling free degree to miss structure
Difference is adjusted, it is possible to achieve very low structural failure, difficulty of processing and assembly difficulty will all be substantially reduced.
It is an advantage of the invention that：The present invention utilizes two panels sheet type free form surface reflecting surface, maintains and free form surface rib
The same correction ability to virtual image aberration of mirror；The light of outdoor scene is by there is the two of free air gap thin optical window to enter simultaneously
Human eye, it is possible to achieve observation of the human eye to outdoor scene does not almost distort and aberration, it is no longer necessary to entered using compensating prism to outdoor scene
Row compensation.For the traditional free curved surface prism light path of contrast, furthermore achieved that light path light and handyization and image quality it is excellent
Change.
Brief description of the drawings
Fig. 1 is fundamental diagram of the invention.
Embodiment
As shown in figure 1, a kind of imaging system reflected based on double free form surfaces, includes free form surface 1, free form surface
22, projecting lens 3 and an image source 4, the light of 22 pairs of visible light wave ranges of free form surface 1 and free form surface have semi-transparent
Half anti-effect, described image source 4 emits beam after the transmission of projecting lens 3, incides on free form surface 1, from
Light is reflected away again by curved surface 1, the light from outdoor scene light 5 transmit and and free form surface by free form surface 22
The light of one 1 reflections is overlapped, and the human eye at emergent pupil 6 then observes the image of actual situation superposition, the virtual image formed by image source 4
3 meters of the position before human eye.The face shape parameter of two free form surface windows can be carried out according to the image quality of virtual image
Optimization, is corrected meridian and sagitta of arc aberration.
Described free form surface 1 and free form surface 22 is optical plastic or optical glass, and thickness is no more than
1.5mm, to realize the undistorted transmission to outdoor scene light.
Two surfaces of described free form surface 1, free form surface 22 and projecting lens 3 are carried out to increase reflection plated film,
Improve the reflectivity in visible light wave range.The thickness for increasing reflection plated film is optimized according to certain angle of incidence of light scope.
The ranges of incidence angles of described free form surface 1 is 45-60 degree；The ranges of incidence angles of free form surface 22 is 15-25
Degree.
The surface of the remote emergent pupil of free form surface 22 adheres to silver halide microcrystal by absorbing process, according to photochromic mutual
Become reversible reaction principle, attachment can fully absorb ultraviolet under daylight and ultraviolet intense irradiation, it is rapid dimmed, to visible ray
In neutrality absorption；Dark place is returned to, and can fast quick-recovery water white transparency.So there is no need to by frequently changing optical filter come adaptive
The change transmitted light intensity answered, can improve the contrast and observation effect of actual situation scene superposition.
Described image source 4 is one kind in LCD, OLED, DLP, LCoS type Micro display element, autonomous for OLED etc.
Luminescent screen, can be placed directly within object plane, and the Micro display element such as LCoS and DLP belongs to passive emission type, it is necessary to by PBS
Prism or PBS spectro-films.Image planes position and the Image display position of OLED Micro display elements match in this programme, Ke Yizhi
Connect applicable；LCoS Micro display elements, adding image planes position after PBS prisms needs the image with LCoS Micro display elements to show
Position slightly has adjustment.
Described free form surface 1 and free form surface 22 is to be utilized respectively diamond turning lathe processing and manufacturing, processed
Guarantee face type error is only needed in journey；By the structural mount specially designed is come the relative position of element in fixed light path.So
There can be certain assembling free degree that structural failure is adjusted, very low structural failure, difficulty of processing and dress can be achieved
It will all be substantially reduced with difficulty.
Described free form surface one and free form surface two are XY polynomial free curved surfaces, and expression is：
Wherein c is surface curvature；K is secondary aspherical constant；cmnIt is the coefficient of different rank, p is polynomial highest
Power, meets 1≤m+n≤p；Select even power x, it is ensured that symmetry of the face type on YOZ faces.
Described free form surface one and free form surface two are Zernike polynomial free curved surfaces, expression
For：
Wherein Z (x, y) is that Section 1 is Conic curvature portions on the right of the rise amount of optical surface, equal sign, and c is that surface is bent
Rate, k is secondary aspherical constant, and Section 2 is Zernike multinomials, AiIt is Zernike multinomial coefficients, EiIt is Zernike many
Item formula, ρ, θ is the polynomial variables of Zernike respectively.
Described free form surface one and free form surface two are double-curved surface, and its mathematical description equation is as follows：
Wherein, cxIt is radius of curvature of the curved surface in X-Z plane, cyIt is radius of curvature of the curved surface in Y-Z plane, kxIt is
Curved surface is in the quadratic surface coefficient in sagitta of arc direction, kyIt is quadratic surface coefficient of the curved surface in meridian direction, Ai is on Z axis rotation
Symmetrical asphericity coefficient, Bi is rotation asymmetry coefficient.
According to the specific embodiment of the present invention, shown in the following Tables 1 and 2 of parameter of each optical surface.
The optical component parameter table of table 1
The freeform optics surface parameter list of table 2.
Claims (9)
1. a kind of imaging system reflected based on double free form surfaces, it is characterised in that：Include free form surface one, free form surface
2nd, a projecting lens and image source, free form surface one and free form surface two have semi-transparent semi-reflecting to the light of visible light wave range
Effect, described image source emits beam after the transmission of projecting lens, incides on free form surface one, free form surface one
Light is reflected away again, the light that the light from outdoor scene light is transmitted and reflected with free form surface one by free form surface two
It is overlapped, the human eye at emergent pupil then observes the image of actual situation superposition, the virtual image formed by image source is located at before human eye 3 meters
Position.
2. a kind of imaging system reflected based on double free form surfaces according to claim 1, it is characterised in that：It is described from
It is optical plastic or optical glass by curved surface one and free form surface two, and thickness is no more than 1.5mm.
3. a kind of imaging system reflected based on double free form surfaces according to claim 1, it is characterised in that：Will be described
Two surfaces of free form surface one, free form surface two and projecting lens carry out increasing reflection plated film.
4. a kind of imaging system reflected based on double free form surfaces according to claim 1, it is characterised in that：It is described from
It is 45-60 degree by the ranges of incidence angles of curved surface one；The ranges of incidence angles of free form surface two is 15-25 degree.
5. a kind of imaging system reflected based on double free form surfaces according to claim 1, it is characterised in that：Free form surface
The surface of two remote emergent pupil adheres to silver halide microcrystal by absorbing process.
6. a kind of imaging system reflected based on double free form surfaces according to claim 1, it is characterised in that：Described figure
Image source is one kind in LCD, OLED, DLP, LCoS type Micro display element.
7. a kind of imaging system reflected based on double free form surfaces according to claim 1, it is characterised in that：It is described from
It is XY polynomial free curved surfaces by curved surface one and free form surface two, expression is：
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Meet 1≤m+n≤p；Select even power x, it is ensured that symmetry of the face type on YOZ faces.
8. a kind of imaging system reflected based on double free form surfaces according to claim 1, it is characterised in that：Described is freely bent
Face one and free form surface two are Zernike polynomial free curved surfaces, and expression is：
Wherein Z (x, y) is that Section 1 is Conic curvature portions on the right of the rise amount of optical surface, equal sign, and c is surface curvature, k
It is secondary aspherical constant, Section 2 is Zernike multinomials, AiIt is Zernike multinomial coefficients, EiIt is Zernike multinomial
Formula, ρ, θ is the polynomial variables of Zernike respectively.
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It is double-curved surface by curved surface one and free form surface two, its mathematical description equation is as follows：
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Wherein, cxIt is radius of curvature of the curved surface in X-Z plane, cyIt is radius of curvature of the curved surface in Y-Z plane, kxIt is curved surface
Quadratic surface coefficient in sagitta of arc direction, kyIt is quadratic surface coefficient of the curved surface in meridian direction, Ai is rotationally symmetrical on Z axis
Asphericity coefficient, Bi is rotation asymmetry coefficient.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710713877.9A CN107300777A (en) | 2017-08-18 | 2017-08-18 | A kind of imaging system reflected based on double free form surfaces |
| DE212018000009.3U DE212018000009U1 (en) | 2017-08-18 | 2018-03-12 | A dual freeform surface reflection based imaging system and augmented reality device |
| PCT/CN2018/078726 WO2019033748A1 (en) | 2017-08-18 | 2018-03-12 | Imaging system based on dual-free-form surface reflection and augmented reality device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710713877.9A CN107300777A (en) | 2017-08-18 | 2017-08-18 | A kind of imaging system reflected based on double free form surfaces |
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| CN107300777A true CN107300777A (en) | 2017-10-27 |
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|---|---|---|---|
| CN201710713877.9A Pending CN107300777A (en) | 2017-08-18 | 2017-08-18 | A kind of imaging system reflected based on double free form surfaces |
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| Country | Link |
|---|---|
| CN (1) | CN107300777A (en) |
| DE (1) | DE212018000009U1 (en) |
| WO (1) | WO2019033748A1 (en) |
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| CN108646419A (en) * | 2018-07-03 | 2018-10-12 | 杭州光粒科技有限公司 | The rear-projection projection-based augmented reality display system of bright spot can be eliminated |
| WO2019033748A1 (en) * | 2017-08-18 | 2019-02-21 | 深圳惠牛科技有限公司 | Imaging system based on dual-free-form surface reflection and augmented reality device |
| CN109375459A (en) * | 2018-12-10 | 2019-02-22 | 杭州炽云科技有限公司 | A kind of virtual image forming system using free form surface |
| CN109782441A (en) * | 2017-11-14 | 2019-05-21 | 塔普翊海（上海）智能科技有限公司 | A kind of aobvious optical system of the see-through head of nearly eye |
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| CN112083562A (en) * | 2020-08-14 | 2020-12-15 | 清华大学 | Off-axis two-mirror imaging system with real exit pupil |
| CN112162368A (en) * | 2020-10-23 | 2021-01-01 | 深圳市都乐精密制造有限公司 | Free-form surface reflective coupling lens |
| CN112649957A (en) * | 2019-10-10 | 2021-04-13 | 华为技术有限公司 | Display device module and head-mounted display device |
| CN112649953A (en) * | 2019-10-10 | 2021-04-13 | 华为技术有限公司 | Display device module and head-mounted display device |
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