CN106646884A - Projection objective and three-dimensional display device - Google Patents
Projection objective and three-dimensional display device Download PDFInfo
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- CN106646884A CN106646884A CN201611270016.XA CN201611270016A CN106646884A CN 106646884 A CN106646884 A CN 106646884A CN 201611270016 A CN201611270016 A CN 201611270016A CN 106646884 A CN106646884 A CN 106646884A
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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
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a projection objective with a large field of view. The projection objective comprises a light splitting device, a relay lens group and a light splitting assembly. The relay lens group comprises an aspherical lens group and a nanometer lens. The nanometer lens with a diffractive surface is introduced in an optical system to replace a doublet lens so as to reduce system weight. The projection objective designed in the invention is used in conjunction with a DMD, LCD or LCOS display device and a corresponding illumination light source to collect a light beam reflected by the display device at an exit pupil. The exit pupil is outside the projection structure and matches a subsequent nano-waveguide lens to construct a three-dimensional display device, especially a near-eye three-dimensional display device. The projection objective has the characteristics of displaying high field of view, high image quality and high light utilization efficiency.
Description
Technical field
The present invention relates to display device technical field, more particularly, it relates to a kind of projection objective and three-dimensional display apparatus.
Background technology
Augmented reality (AR) technology is a kind of by the integrated new skill of real world information and virtual world information " seamless "
Art, be script in the certain hour spatial dimension of real world be difficult experience entity information (visual information, sound,
Taste, tactile etc.), by science and technology such as computers, it is superimposed again after analog simulation, by virtual Information application to real world,
Perceived by human sensory, so as to reach the sensory experience of exceeding reality.Real environment and virtual object are superimposed in real time
Same picture is arrived or space has existed simultaneously.
The optical system of augmented reality (AR) technology is an image enhancement system, the image produced by micro-display by
Optical system amplify, before human eye at a certain distance from present one amplification the virtual image, user is immersed in completely virtual
Among situation, do not disturbed by external information.If input 3D video signals, without the need for other auxiliary device, you can be directly realized by
3D stereo displays.
As semiconductor technology develops, such as digital micro-mirror chip (Digital micro-mirror device, DMD),
Display panels (LCD panel) and silicon wafer chip (Lcos chip) are increasingly miniaturized while pixel is improved, to the helmet
Show that miniaturization provides condition, AR optical systems are just gradually to big visual field, high resolution, low weight and small size etc. in terms of
Exhibition.Optical projection system is the important component part of Helmet Mounted Display.Optical projection system design not only affects image displaying quality quality, also
Volume, the weight of Helmet Mounted Display, and the level of comfort of observer are affected, the visual experience of observer is decide.
United States Patent (USP) US2014/0211322A1 proposes a kind of projection optical system, the reflective plano-convex in the case of big visual field
The bore of lens 238 can be very big, causes whole optical system volume to become big.As shown in Figure 1.
Based on this, it would be highly desirable to a kind of miniaturization, big visual field, the projection lens of high pixel and its three-dimensional display apparatus.
The content of the invention
In view of this, the invention provides a kind of miniaturization, big visual field, the projection objective of high pixel and its three dimensional display dress
Put.
To reach above-mentioned purpose, technical scheme is as follows：
A kind of projection objective, including light-splitting device, relay lens group, spectrum groupware, the relay lens group includes：
Using the non-spherical lens group of Aspherical corrector aberration；
And/or including at least a piece of nano lens being provided with as diffraction surfaces.
The present invention is introduced in optical system and is provided with diffraction surfaces nano lens, is replaced with nano lens for achromatic double
Balsaming lenss, can both play achromatic effect, and the weight of system can be substantially reduced again.
Preferably, the emergent pupil of the projection objective is located at the outside of the plus lens for collimated ray.
Preferably, the relay lens group is respectively provided with along the direction order that light is propagated：It is first plus lens, second just saturating
Mirror, the first minus lenses, nano lens, the 3rd plus lens, the second minus lenses.
Preferably, first plus lens are aspheric convex lenss for two faces, and second plus lens are two
Face is aspheric convex lenss, and first minus lenses are the lens that two faces are concave surface, and the 3rd plus lens are two
Individual face is the lens of convex surface, and second minus lenses are aspheric concavees lens for two concave surfaces.
Preferably, the nano lens are one side or two-sided are carved with the saturating of the ascending concentric circles optical grating construction of radius
Mirror.
Preferably, the spectrum groupware includes plus lens in emergent pupil direction.
By the projection objective of present invention design, coordinating to DMD, LCD or LCOS display part and corresponding lighting source makes
With, by the beam collection of display device reflection at emergent pupil, emergent pupil convergence nano lens ripple outside projection structure and follow-up
Lead eyeglass matching, the three-dimensional display apparatus of structure, particularly near eye three-dimensional display apparatus, with the big visual field of display, height as matter, light
The high feature of utilization ratio.
Preferably, plus lens of the spectrum groupware in emergent pupil direction are planoconvex lenss.
Preferably, the nano lens diffraction surfaces are near the conjugate planes of projection objective emergent pupil.
Preferably, the spectrum groupware includes respectively from light direction of propagation order：Amici prism, reflecting lens are used for
The plus lens of collimated ray.
Preferably, the light splitting surface of the Amici prism is half-reflection and half-transmission face；The reflecting lens are glued on Amici prism；
The convex surface of reflecting lens is coated with the reflectance coating for making incident ray be reflected back Amici prism；Plus lens for collimated ray are glued at
Amici prism is on the face of emergent pupil.
Preferably, the convex surface of the reflecting lens is aspheric surface.
Preferably, the projection objective is respectively provided with along the direction order that light is propagated：Including light-splitting device, relay lenss
Group, spectrum groupware；Relay lens group is respectively provided with along the direction order that light is propagated：First plus lens, the second plus lens, first
Minus lenses, nano lens, the 3rd plus lens, the second minus lenses, first plus lens are aspheric convex lens for two faces
Mirror, second plus lens are aspheric convex lenss for two faces, and first minus lenses are that two faces are concave surface
Lens, the 3rd plus lens are that two faces are convex lens, and second minus lenses are aspheric for two concave surfaces
Concavees lens.
Using Aspherical corrector aberration and nano lens correction system aberration in relay lens group, it is ensured that large viewing field condition
Under picture matter.
Preferably, the diffraction surfaces of nano lens are near the conjugate planes of projection objective emergent pupil.
Preferably, press as follows containing aspheric shape in first plus lens, the second plus lens and the second minus lenses
Multinomial draws：
Wherein Z represents point in aspheric surface from aspheric vertex of surface with a distance from optical axis direction；R represents that the point in aspheric surface is arrived
The distance of optical axis；C represents aspheric curvature of centre；K represents rate of taper；A4, a6, a8, a10 represent aspheric surface high order term system
Number.
Preferably, beam splitting lenses group includes respectively from light direction of propagation order：
Amici prism, reflecting lens, for the plus lens of collimated ray.
Preferably, the light splitting surface of the Amici prism is half-reflection and half-transmission face；The reflecting lens are glued on Amici prism；
The convex surface of reflecting lens is coated with the reflectance coating for making incident ray be reflected back Amici prism；Plus lens for collimated ray are glued at
Amici prism is on the face of emergent pupil.
Preferably, the emergent pupil of projection objective is located at the outside of the plus lens for collimated ray.Preferably, the throwing
A nanometer waveguide eyeglass is provided with the emergent pupil of shadow object lens.
The present invention also provides a kind of three-dimensional display apparatus, including any of the above-described described projection objective, and image information life
Into device.
Preferably, described image information generation device includes DMD, LCD or LCOS display part, and lighting source.
Description of the drawings
Technical scheme in order to be illustrated more clearly that embodiment of the present invention technology, below will be in the description of embodiment technology
The required accompanying drawing for using is briefly described, it should be apparent that, drawings in the following description are only some realities of the present invention
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the structural representation of prior art；
Fig. 2 is the structural representation of projection objective of the present invention；
Fig. 3 is the schematic diagram of nano lens
It respectively for wavelength is 459nm that Fig. 4-6 is, wavelength is 525nm, the aberration value that wavelength is observed for 618nm
Curve.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
A kind of projection objective, including light-splitting device, relay lens group, spectrum groupware, the spectrum groupware is in emergent pupil direction
It is provided with plus lens.
The present invention arranges plus lens in emergent pupil direction, and preferred planoconvex lenss can be very good to expand angular field of view.
Preferably, plus lens of the spectrum groupware in emergent pupil direction are planoconvex lenss.
The relay lens group includes：
Using the non-spherical lens group of Aspherical corrector aberration；
Can be substituted for at least a piece of nano lens for being provided with diffraction surfaces in relay lens group achromatic double glued
Lens, the nano lens are one side or the two-sided lens for being carved with ascending concentric circles optical grating construction, are as shown in Figure 3
The situation of a piece of nano lens is set up, it is also possible to replace associated lens component with more nano lens, both for correcting system
Aberration, while the weight of relay lens group can be substantially reduced.
The present invention is introduced in optical system and is provided with diffraction surfaces nano lens, is replaced with nano lens for achromatic double
Balsaming lenss, can substantially reduce the weight of system.By the projection objective of present invention design, with DMD, LCD or LCOS display part
And corresponding lighting source is used cooperatively, the beam collection that display device is reflected at emergent pupil, emergent pupil outside projection structure,
Match with follow-up convergence nano lens waveguide eyeglass, the three-dimensional display apparatus of structure, with the big visual field of display, height as matter, light
The high feature of utilization ratio.
As shown in Fig. 2 in certain embodiments, along the direction of beam propagation display device 5 is followed successively by, light-splitting device 1, in
After lens group 2 and spectrum groupware 3, when three-dimensional display apparatus are built, image information light beam (light) is by (the image of display device 5
Information generation device) send, Jing after light-splitting device 1 (can typically adopt Amici prism), converged by relay lens group 2 and be imaged on
Near the light splitting surface of the Amici prism 31 of spectrum groupware 3, then after being collimated by spectrum groupware 3, enter from the concentration of emergent pupil 4 follow-up
In nanometer waveguide eyeglass or other three dimensional display components, finally will be schemed by nano lens waveguide eyeglass or other three dimensional display components
Virtual three dimensional image as being converged to amplification in space of the information in human eye or in front of human eye.
In embodiment of the present invention, the selection of each parameter is determined as needed, and for example, the parameter of projection objective can be：Greatly
60 ° of visual field, display device size can be selected as 0.37 inch, f=8.6mm, emergent pupil size 4mm, and emergent pupil is after plus lens 33
At 5mm.
Display device 5 described in the embodiment of the present invention can be DMD, LCD or LCOS various ways, the photograph of display device 5
Bright mode can be LED, OLED or the various lighting systems of laser；Light-splitting device 1 can be anti-for Amici prism, polarizing prism or half
Various spectroscopic modes such as semi-transparent eyeglass.
In certain embodiments, the projection objective is respectively provided with along the direction order that light is propagated：Including light-splitting device
1st, relay lens group 2, spectrum groupware 3；Relay lens group 2 is respectively provided with along the direction order that light is propagated：First plus lens 21,
Second plus lens 22, the first minus lenses 23, nano lens 24, the 3rd plus lens 25, the second minus lenses 26, first plus lens
21 are aspheric convex lenss for two faces, and second plus lens 22 are aspheric convex lenss for two faces, described
First minus lenses 23 are the lens that two faces are concave surface, the nano lens 24 for one side or it is two-sided be carved with it is ascending with one heart
The lens of toroidal optical grating construction, the 3rd plus lens 25 are convex lens for two faces, and second minus lenses 26 are
Two concave surfaces are aspheric concavees lens.
Using Aspherical corrector aberration and nano lens correction system aberration in relay lens group, it is ensured that large viewing field condition
Under picture matter, the use of nano lens 24, because the nano lens 24 as diffraction optical element have unique negative dispersion special
Point, introduces the nano lens 24 for being provided with diffraction surfaces in optical system, is replaced for achromatic double glued with nano lens 24
Lens can substantially reduce the weight of system.In relay lens group, the diffraction surfaces of nano lens 24 near the conjugate planes of emergent pupil,
The bore of lens in light path can be reduced by this conjugated manner, so as to reduce aberration, be conducive to aberration correction.
For reduces cost, at least piece of plastic eyeglass can be included in relay lens assemblies 2, in order to ensure it is good into
As quality, other eyeglasses are made using glass material.
Preferably, the aspheric shape for containing in first plus lens 21, the second plus lens 22 and the second minus lenses 26
Shape can be drawn by following multinomial：
Wherein Z represents point in aspheric surface from aspheric vertex of surface with a distance from optical axis direction；R represents that the point in aspheric surface is arrived
The distance of optical axis；C represents aspheric curvature of centre；K represents rate of taper；A4, a6, a8, a10 represent aspheric surface high order term system
Number.
In certain embodiments, the spectrum groupware 3 described in the embodiment of the present invention includes respectively along light direction of propagation order：
Amici prism 31, reflecting lens 32, for the plus lens 33 of collimated ray；The light splitting surface of the Amici prism 31 is half-reflection and half-transmission
Face；The reflecting lens 32 are glued on Amici prism 31；The convex surface of reflective planoconvex lenss 32 is aspheric surface, reflecting lens 32
Convex surface is coated with the reflectance coating for making incident ray be reflected back Amici prism 31；Plus lens 33 for collimated ray are glued at light splitting rib
Mirror 31 is on the face of emergent pupil.
After beam splitting lenses component 3, the collimated simultaneously outgoing of Jing emergent pupils 4 of light, and follow-up nanometer waveguide eyeglass matching.Instead
The use of optical lens 32, the delivery altitude in subsequent optical path is efficiently reduced using reflecting surface, so as to reduce the bore of lens,
It is equally beneficial for reducing aberration.
Emergent pupil 4 described in the embodiment of the present invention is located at behind plus lens 33 at 5mm, and emergent pupil size is 4mm, and emergent pupil 4 is located at
Projection objective structure outside, has using the matching with follow-up nanometer waveguide lens, effectively improves the utilization ratio of luminous energy.
The projection objective of present embodiment, its aberration, the curvature of field and distortion are respectively as shown in Fig. 4 to Fig. 6.Fig. 4 to Fig. 6 distinguishes
Be for wavelength be 459nm, wavelength is 525nm, the aberration value curve that wavelength is observed for 618nm.Found out by Fig. 4, projected
The chromatic longitudiinal aberration of object lens is less than 5 microns.Curve T and S are respectively meridianal curvature of field (tangential field in Fig. 5
Curvature) characteristic curve and Sagittal field curvature (sagittal fieldcurvature) characteristic curve.It can be seen that, meridianal curvature of field value
It is controlled in the range of (- 0.25mm, 0.25mm) with Sagittal field curvature value, curve dis is distortion performance curve, as shown in Figure 5, abnormal
Variable be controlled in (- 1%, 1%) in the range of.Found out by Fig. 6, full filed optical transfer function MTF under 601p/mm spatial frequencys
>40%.As can be seen here, the aberration of projection objective, the curvature of field, distortion can be controlled (amendment) in less scope.
Preferably, a nanometer waveguide eyeglass is provided with the emergent pupil of the projection objective.
The present invention also provides a kind of three-dimensional display apparatus, including any of the above-described described projection objective, and image information life
Into device.
Preferably, described image information generation device includes DMD, LCD or LCOS display part, and lighting source.
Above-mentioned projection objective and the three-dimensional display apparatus built using it particularly couple the nearly eye in big visual field that nearly eye shows
Display device, has the characteristics that：
1) nano lens with diffraction surfaces are added, using being used in conjunction with for refraction-diffraction hybrid system and illuminator, is increased
Degree of freedom during optical design can break through many limitations of conventional optical systems, and image quality is improved system body is reduced
The aspect such as product and weight, optimization system gravity position, reduces cost has the unrivaled advantage of conventional optical systems.Nanometer is thoroughly
Mirror wave lead eyeglass can add it is a piece of, it is also possible to add 2,3 even more multi-discs as needed.
2) use of plus lens 33, favorably in the case of big visual field, reduces the bore of reflecting lens 32, so as to reduce entirety
Light path volume, and realize beam path alignment using Amici prism group 3, accurately say, after plus lens 33, emergent light becomes and is defined
Direct light, realizes the collimation of light path.
3) intermediary image that display device 5 generates image (is located at the position that label 6 is indicated in Fig. 2 in Amici prism 31
Put), it is easy to reduce light path overall volume in the case of big visual field.
4) outside projection objective, the matching of convenient and follow-up nanometer waveguide eyeglass is used projection objective emergent pupil, there is utilization
The platycoria of overall light path and optimization are as matter.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment similar portion mutually referring to.To stating in the disclosed embodiments
It is bright, professional and technical personnel in the field is realized or using the present invention.To various modifications of these embodiments to this area
Will be apparent for professional and technical personnel, generic principles defined herein can be in the spirit without departing from the present invention
Or in the case of scope, realize in other embodiments.Therefore, the present invention will not be limited and these enforcements shown in this article
Example, and it is to fit to the most wide scope consistent with principles disclosed herein and features of novelty.
Claims (12)
1. a kind of projection objective, including light-splitting device, relay lens group, spectrum groupware, it is characterised in that the relay lens group
Including：
Using the non-spherical lens group of Aspherical corrector aberration；
And/or including at least a piece of nano lens being provided with as diffraction surfaces.
2. projection objective according to claim 1, it is characterised in that the relay lens group is suitable along the direction that light is propagated
Sequence is respectively provided with：First plus lens, the second plus lens, the first minus lenses, nano lens, the 3rd plus lens, the second minus lenses.
3. projection objective according to claim 2, it is characterised in that first plus lens are aspheric surface for two faces
Convex lenss, second plus lens are aspheric convex lenss for two faces, and first minus lenses are for two faces
The lens of concave surface, the 3rd plus lens are the lens that two faces are convex surface, and second minus lenses are for two concave surfaces
Aspheric concavees lens.
4. projection objective according to claim 2, it is characterised in that the nano lens are for one side or two-sided are carved with radius
The lens of ascending concentric circles optical grating construction.
5. projection objective according to claim 2, it is characterised in that the nano lens diffraction surfaces go out located at projection objective
Near the conjugate planes of pupil.
6. according to the arbitrary described projection objective of claim 1 to 5, it is characterised in that the spectrum groupware is wrapped in emergent pupil direction
Include plus lens.
7. projection objective according to claim 6, it is characterised in that plus lens of the spectrum groupware in emergent pupil direction are
Planoconvex lenss.
8. projection objective according to claim 6, it is characterised in that the emergent pupil of the projection objective is located at described for standard
The outside of the plus lens of direct light line.
9. according to the arbitrary described projection objective of claim 1 to 5, it is characterised in that the spectrum groupware is from light propagation side
Include respectively to order：Amici prism, reflecting lens, for the plus lens of collimated ray.
10. projection objective according to claim 9, it is characterised in that the light splitting surface of the Amici prism is half-reflection and half-transmission
Face；The reflecting lens are glued on Amici prism；The convex surface of reflecting lens is coated with makes incident ray be reflected back Amici prism
Reflectance coating；Plus lens for collimated ray are glued at Amici prism near the face of emergent pupil.
11. projection objectives according to claim 10, it is characterised in that the convex surface of the reflecting lens is aspheric surface.
12. a kind of three-dimensional display apparatus, it is characterised in that include the projection objective as described in claim 1 to 5 is arbitrary, and figure
As information generation device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611270016.XA CN106646884B (en) | 2016-12-30 | 2016-12-30 | Projection objective and three-dimensional display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611270016.XA CN106646884B (en) | 2016-12-30 | 2016-12-30 | Projection objective and three-dimensional display device |
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| CN106646884A true CN106646884A (en) | 2017-05-10 |
| CN106646884B CN106646884B (en) | 2020-03-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324833A (en) * | 2016-09-07 | 2017-01-11 | 吉林大学 | Method of designing projection-type helmet objective lens with ideal retina imaging as target |
| WO2018121010A1 (en) * | 2016-12-30 | 2018-07-05 | 苏州苏大维格光电科技股份有限公司 | Projection objective and three-dimensional display device |
| CN110646940A (en) * | 2019-09-29 | 2020-01-03 | 上海意扬数码科技有限公司 | Folding optical system for motorcycle helmet |
| WO2023206782A1 (en) * | 2022-04-28 | 2023-11-02 | 歌尔光学科技有限公司 | Projection system and electronic device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324833A (en) * | 2016-09-07 | 2017-01-11 | 吉林大学 | Method of designing projection-type helmet objective lens with ideal retina imaging as target |
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| WO2023206782A1 (en) * | 2022-04-28 | 2023-11-02 | 歌尔光学科技有限公司 | Projection system and electronic device |
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| Publication number | Publication date |
|---|---|
| CN106646884B (en) | 2020-03-20 |
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