CN202975475U - A holographic optical waveguide helmet display optical system - Google Patents
A holographic optical waveguide helmet display optical system Download PDFInfo
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- CN202975475U CN202975475U CN 201220600218 CN201220600218U CN202975475U CN 202975475 U CN202975475 U CN 202975475U CN 201220600218 CN201220600218 CN 201220600218 CN 201220600218 U CN201220600218 U CN 201220600218U CN 202975475 U CN202975475 U CN 202975475U
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- optical waveguide
- holographic optical
- reflecting surface
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Abstract
The utility model provides a holographic optical waveguide helmet display optical system which is composed of a relay collimating optical system, a holographic optical waveguide assembly, and a displaying image source. Having been collimated by the relay collimated optical system, the light of the displaying image source enters the holographic optical waveguide assembly in a coupling manner. When transmitted in the holographic optical waveguide assembly, a light wave partly diffracts to generate a holographic optical waveguide. In the meantime, the light of an external scene passes through the holographic optical waveguide assembly, so users see an image coupling the holographic optical waveguide is superposed on the external scene in a projecting manner. The advantages of the holographic optical waveguide helmet display optical system is that holographic technology and waveguide technology are combined by using the holographic technology and the waveguide technology. Therefore, off-axis transmission of a light path is resolved effectively, system imaging quality is guaranteed, clear imaging and low distortion are satisfied, and weight and size of the system are reduced. As a result, overall performance of the system is increased and a problem of large difficulty in conventional optical design and production is resolved.
Description
Technical field
The utility model relates to a kind of optical system, specifically a kind of helmet display optical system.
Background technology
Helmet Mounted Display is as a kind of important optoelectronic display device, and playing provides crucial observing and controlling information, the key effect that improves the situation perceptibility for aircraft or tank driver, individual soldier, spacefarer etc.Helmet Mounted Display, under the prerequisite that satisfies function and reliability, its weight and version are constantly proposed Secretary, weight reduction can reduce the personnel's of wearing load, good version can guarantee the head centroid position, thereby delay wearer's degree of fatigue, prevent that impact from causing that neck is sprained etc.
Traditional helmet display optical system is installed in order to adapt to the helmet, assurance realizes good Presentation Function, requires tightly for the curvature tolerance of safety goggles, and the relay lens group eyeglass need to be from axle and inclination, make the relay lens build-up tolerance tight, optical distortion, larger from the axle residual aberration, emergent pupil and the visual field of system are less, cause the global design difficulty large, processing and the cycle of debuging are long, cost is high, the optical lens group complex structure, and quality, volume are larger.
The utility model content
The technical problems to be solved in the utility model is to provide that a kind of effective solution light path is clear from axle transmission problem, system imaging, the weight and volume of little distortion, system is little, and the holographic optical waveguide helmet display optical system of easily making.
the utility model solves the problems of the technologies described above by the following technical solutions: a kind of holographic optical waveguide helmet display optical system, by the relaying collimating optical system, the holographic optical waveguide assemblies, show that image source consists of, the light that shows image source collimates through the relaying collimating optical system, afterwards, be coupled into the holographic optical waveguide assemblies, light wave is through the transmission of holographic optical waveguide assemblies the time, light wave part diffraction goes out the holographic optical waveguide, simultaneously, the light of outer scene sees through the holographic optical waveguide assemblies, the user sees that the image that is coupled out the holographic optical waveguide is superimposed upon on outer scene with projection pattern.
the utility model can further be optimized for: the holographic optical waveguide assemblies is comprised of two planar light waveguides: horizontal holographic optical waveguide and vertical holographic optical waveguide, horizontal holographic optical waveguide is made respectively a holographic reflecting element away from the two ends of the one side of incident light: the first holographic reflecting surface, the second holographic reflecting surface, vertical holographic optical waveguide is also made respectively a holographic reflecting element away from the two ends of the one side of incident light: the 3rd holographic reflecting surface, the 4th holographic reflecting surface, the plate face of horizontal holographic optical waveguide and vertical holographic optical waveguide is mutually vertical, and the second holographic reflecting surface is parallel to the 3rd holographic reflecting surface.
light after the first holographic reflecting surface collimates the relaying collimating optical system is coupled into horizontal holographic optical waveguide, light wave transmits in the horizontal direction, when being transferred to the second holographic reflecting surface, part light is diffracted goes out horizontal holographic optical waveguide, and zero order light remains in horizontal holographic optical waveguide to front transmission, run into the second holographic reflecting surface at every turn and be coupled out portion of energy, the luminous energy that horizontal holographic optical waveguide diffraction is coupled out, the 3rd holographic reflecting surface by vertical holographic optical waveguide receives, be coupled into vertical holographic optical waveguide, light wave transmits in the vertical direction, when being transferred to the 4th holographic reflecting surface, part light is diffracted goes out vertical holographic optical waveguide, the residue zero order light remains on vertical holographic optical waveguide and transmits forward.
The utility model can further be optimized for: described relaying collimating optical system is selected three lens arrangements, intermediate lens is cemented doublet, preferably a plano-convex lens and a plano-concave lens glue together, the first lens of both sides and the 3rd lens are plano-convex lens, and preferred, the convex surface of three lens is the even aspheric surface, and convex surface is all towards horizontal holographic optical waveguide.
More specifically, the described first holographic reflecting surface and the 3rd holographic reflecting surface use first-order diffraction, and on the second holographic reflecting surface and the 4th holographic reflecting surface, each zero level and first-order diffraction efficient remain unchanged, to its zero level and by formula (1) distribution of first-order diffraction efficient;
Wherein: η---holographic optical waveguide decoupling efficient; ρ
0---be zeroth-order efficiency; ρ
l---first-order diffraction efficient; K---diffraction number of times;
The diffraction number of times rounds: the k=[L/ Δ] (2)
Wherein: L---the holographic facet width; The interval of Δ---light beam;
The interval of light beam: Δ=2ttan θ (3)
Wherein: Δ---the interval of light beam; T---planar waveguide thickness; θ---angle of diffraction;
Angle of diffraction:
Wherein: θ---angle of diffraction; D---space periodic; M---the order of diffraction is inferior; λ---lambda1-wavelength;
I---incident angle;
Space periodic:
Wherein: λ
of---object light and reference light wavelength;
---object light and angle between reference;
the first holographic reflecting surface and the 3rd holographic reflecting surface use positive first-order diffraction, the second holographic reflecting surface and the 3rd holographic reflecting surface use negative first-order diffraction, utilize formula (4), (5) determine the angle of object light and reference light in conjunction with field angle and holographic optical waveguide index, according to exit pupil diameter, eye-point distance, the size of the 4th holographic reflecting surface is determined in the visual field, according to formula (1) ~ (5) and field angle, determine the thickness of vertical holographic optical waveguide in conjunction with the coupling efficiency of the suitable width of light beam that collimates outgoing and the 3rd holographic reflecting surface, and then provide the size of the second holographic reflecting surface and the 3rd holographic reflecting surface, in like manner determine the thickness of horizontal holographic optical waveguide and the size of the first holographic reflecting surface.
The optical design index of described holographic optical waveguide helmet display optical system is:
Eye-point distance: 25mm;
Field angle: 20 ° * 15 °;
Image source: 0.67 inch; 4:3;
Emergent pupil: 10mm;
Spectral range: 495 ~ 530nm.
The utility model has the advantage of: utilize holography and guide technology, holography is combined with guide technology, effectively solve light path from the axle transmission problem, guarantee the system imaging quality, satisfy imaging clearly, little distortion has reduced the weight and volume of system, thereby the combination property of height-adjusting system has solved the traditional optical design problem large with making upper difficulty.
The holographic optical waveguide helmet display optical system of designing, 20 ° * 15 ° of field angle, general assembly (TW) is less than 40 grams, back work distance is 13.5mm, maximum disc of confusion diameter 30 μ m, and distortion is less than 0.6%, maximum disc of confusion diameter is less than 10 μ m in 10 ° * 10 ° field ranges, wherein, relay system weight is less than 10 grams, the long 35.6mm of relay system.
Description of drawings
Fig. 1 is the structure principle chart of the utility model holographic optical waveguide helmet display optical system.
Fig. 2 is the waveguide of horizontal direction expansion light holographic optical.
Fig. 3 is the waveguide of vertical direction expansion light holographic optical.
Fig. 4 is the structure principle chart of relaying collimating optical system.
Fig. 5 is 0 ° * 15 ° 121 the two-dimentional point range figures of visual field point.
Fig. 6 is 10 ° * 10 ° 121 the two-dimentional point range figures of visual field point.
Embodiment
As shown in Figure 1, the utility model holographic optical waveguide helmet display optical system comprises relaying collimating optical system 1, holographic optical waveguide assemblies, shows image source, show that the light of image source through relaying collimating optical system collimation, afterwards, is coupled into the holographic optical waveguide assemblies.
The holographic optical waveguide assemblies comprises two planar light waveguides: horizontal holographic optical waveguide 22 and vertical holographic optical waveguide 24.Consult simultaneously Fig. 2 and shown in Figure 3, the two ends away from the one side of incident light 42 of horizontal holographic optical waveguide 22 make respectively a holographic reflecting element: the first holographic reflecting surface 222, the second holographic reflecting surface 224, the two ends away from the one side of incident light 52 of vertical holographic optical waveguide 24 also make respectively a holographic reflecting element: the 3rd holographic reflecting surface 242, the 4th holographic reflecting surface 244.The plate face of horizontal holographic optical waveguide 22 and vertical holographic optical waveguide 24 is mutually vertical, and the second holographic reflecting surface 224 is parallel to the 3rd holographic reflecting surface 242.
Light after the first holographic reflecting surface 222 collimates relaying collimating optical system 1 is coupled into horizontal holographic optical waveguide 22, light wave 44 transmits in the horizontal direction, when being transferred to the second holographic reflecting surface 224, part light is diffracted to be gone out horizontal holographic optical waveguide 22 and forms diffraction emergent lights 46, and that zero order light remains on horizontal holographic optical waveguide 22 is interior to front transmission, runs into the second 224 of holographic reflectings surface at every turn and is coupled out portion of energy.The diffraction emergent light 46 of horizontal holographic optical waveguide 22 is received by the 3rd holographic reflecting surface 242 of vertical holographic optical waveguide 24, incident light 52 as vertical holographic optical waveguide 24, be coupled into vertical holographic optical waveguide 24, light wave 54 transmits in the vertical direction, when being transferred to the 4th holographic reflecting surface 244, same part light is diffracted to be gone out vertical holographic optical waveguide 24 and forms diffraction emergent lights 56, and the residue zero order light remains on vertical holographic optical waveguide 24 and transmits forward.
Like this, in the expansion of level and vertical both direction, the system of assurance has larger emergent pupil to the arrow beam of light of relaying collimating optical system 1 by effectively, and relaying collimating optical system 1 has less bore and gets final product, and makes mass of system alleviate.Simultaneously, reasonably design the spatial frequency of holographic reflecting surface, control the inferior energy distribution of zero level and diffraction decoupling level, can optimize the utilization factor of luminous energy, in conjunction with the selection to optical waveguide thickness t and Refractive Index of Material, can control the order of reflection of light wave in the holographic optical waveguide, interval V and the H of outgoing beam, reduce the intensity modulated effect that human eye rocks generation.
It is below the design of optical system parameter.
According to the comparison to conventional helmet display system design objective, following optical design index is proposed:
Eye-point distance: 25mm;
Field angle: 20 ° * 15 °;
Image source: 0.67 inch; 4:3;
Emergent pupil: 10mm;
Spectral range: 495 ~ 530nm;
Whole system adopts reverse light path design, relaying collimating optical system 1 is born the focal power of whole system, see also shown in Figure 4, described relaying collimating optical system 1 is selected three lens arrangements, intermediate lens is cemented doublet, it is a plano-convex lens and plano-concave lens gummed, with adequate compensation holographic optical waveguide device aberration, the first lens of both sides and the 3rd lens are plano-convex lens, proofread and correct senior aberration, and the convex surface of three lens is the even aspheric surface, and convex surface is all towards horizontal holographic optical waveguide 22.
The design of holographic optical waveguiding structure is considered, the pupil diameter of human eye is generally 3 ~ 5mm, thereby the interval of a certain visual field outgoing beam must be less than 3mm, in order to avoid rocking, human eye loses the visual field, simultaneously, reduce as far as possible interval V and the H of same visual field outgoing beam, the uniform distribution diffraction energy is to alleviate the light intensity modulation effect.Due to the directional light of the light that enters the holographic optical waveguide for collimation, thereby holographic reflecting element can use the manufacture craft of holographic grating.Object light in design and reference light are directional light, and its angle, wavelength, photosensitive material determine the spatial frequency of holographic facet, select He-Ne optical maser wavelength 632.8nm as the structure wavelength of holographic optical waveguide; Waveguide plate material selection high-index material, angle of total reflection less can reduce the outgoing beam interval, but mass of system will increase, and select K9 glass here.
The inferior energy distribution that reaches of the order of diffraction, the first holographic reflecting surface 222 and the 3rd 242 of holographic reflectings surface play the effect that the coupling light wave enters corresponding holographic optical waveguide, for guaranteeing coupling efficiency, reduce or avoid re-diffraction occurring on this face, only use first-order diffraction, the first holographic reflecting surface 222 and the 3rd holographic reflecting surface 242 adopt high efficiency holographic element, and this order diffraction efficient can near 100%, guarantee to be coupled into the energy as much as possible of holographic optical waveguide; By the thickness t of holographic optical waveguide is set, the width of the first holographic reflecting surface 222 and the 3rd holographic reflecting surface 242, the size of angle of diffraction makes light wave by predetermined light paths transmission needs, avoids re-diffraction occurring on the first holographic reflecting surface 222 and the 3rd holographic reflecting surface 242.The second holographic reflecting surface 224 and the 4th holographic reflecting surface 244 play the effect that light wave is coupled out holographic optical waveguide and extensible beam, for guaranteeing enough energy decoupling efficient, be located on the second holographic reflecting surface 224 and the 4th holographic reflecting surface 244, each zero level and first-order diffraction efficient remain unchanged, to its zero level and by formula (1) distribution of first-order diffraction efficient;
η---holographic optical waveguide decoupling efficient;
ρ
0---be zeroth-order efficiency;
ρ
l---first-order diffraction efficient;
K---diffraction number of times;
The diffraction number of times rounds
k=【L/Δ】 （2）
L---holographic facet width;
The interval of Δ---light beam;
The interval of light beam
Δ=2t·tanθ （3）
The interval of Δ---light beam;
T---planar waveguide thickness;
θ---angle of diffraction;
Angle of diffraction
θ---angle of diffraction;
D---space periodic;
M---the order of diffraction is inferior;
λ---lambda1-wavelength;
I---incident angle;
Space periodic
λ
of---object light and reference light wavelength;
The aberration of introducing in order to reduce holographic reflecting surface dispersion, the first holographic reflecting surface 222 and the 3rd holographic reflecting surface 242 use positive first-order diffraction in design, the second holographic reflecting surface 224 and the 3rd holographic reflecting surface 244 use negative first-order diffraction, to offset most aberration.Utilize formula (4), (5) consideration field angle and substrate refractive index can determine the angle of object light and reference light.Determine the size of second holographic optical waveguide holographic facet d according to exit pupil diameter, eye-point distance, visual field.According to formula (1) ~ (5) and field angle, the suitable width of light beam of consideration collimation outgoing and the coupling efficiency of holographic facet c are determined the thickness of second holographic optical waveguide substrate, and then provide holographic facet c, b size, in like manner determine the thickness of first holographic optical waveguide substrate and the size of a.
Determine the structural parameters of system according to above method after, utilize Code V optics software design and optimize.Image quality is estimated by point range figure and distortion figure, as shown in Fig. 5 ~ 6.
Design result, optical system general assembly (TW) are less than 40 grams, and back work distance is 13.5mm, maximum disc of confusion diameter 30 μ m, distortion is less than 0.6%, and maximum disc of confusion diameter is less than 10 μ m in 10 ° * 10 ° scopes, wherein, relay system weight is less than 10 grams, the long 35.6mm of relay system.Can find out from Fig. 5,6, although between holographic facet and the relay system comprehensive compensation most of aberration, system appoints the certain remaining aberration of right existence, but whole color spot radius is less, satisfies the aberration requirement.
The utility model holographic optical waveguide helmet display optical system is that the hologram with particular design is embedded into optical waveguide substrate (horizontal holographic optical waveguide 22 and vertical holographic optical waveguide 24), consist of holographic optical waveguide component (the first holographic reflecting surface 222, the second holographic reflecting surface 224, the 3rd holographic reflecting surface 242, the 4th holographic reflecting surface 244), light wave is limited in horizontal holographic optical waveguide 22 and vertical holographic optical waveguide 24 and transmits by particular path.Holographic optical waveguide-coupled light wave makes it satisfy total reflection light waveguide condition, and light wave is controlled light wave part diffraction and gone out the holographic optical waveguide through the holographic optical waveguide time.Simultaneously, the light of outer scene well sees through this holographic optical waveguide, and the user can see that the image that is coupled out the holographic optical waveguide is superimposed upon on outer scene with projection pattern like this.In addition, this system has very large emergent pupil, display is installed on the helmet for the user like this dirigibility is provided.Because thin glass substrate is used in the holographic optical waveguide, the relaying collimating optical system is in coaxial, and the mitigation system quality, guarantee the image quality that system is good simultaneously so effectively.
The preferred embodiment that the above is only created for the utility model; do not create in order to limit the utility model; all any modifications of doing within spirit that the utility model is created and principle, be equal to and replace and improvement etc., within all should being included in the protection domain that the utility model creates.
Claims (7)
1. holographic optical waveguide helmet display optical system, it is characterized in that: comprise relaying collimating optical system, holographic optical waveguide assemblies, show image source, show that the light of image source is after relaying collimating optical system collimation, be coupled into the holographic optical waveguide assemblies, the image that is coupled out the holographic optical waveguide assemblies is superimposed upon on light through the outer scene of holographic optical waveguide assemblies with projection pattern.
2. holographic optical waveguide helmet display optical system as claimed in claim 1, it is characterized in that: the holographic optical waveguide assemblies is comprised of two planar light waveguides: horizontal holographic optical waveguide and vertical holographic optical waveguide, horizontal holographic optical waveguide is made respectively a holographic reflecting element away from the two ends of the one side of incident light: the first holographic reflecting surface, the second holographic reflecting surface, vertical holographic optical waveguide is also made respectively a holographic reflecting element away from the two ends of the one side of incident light: the 3rd holographic reflecting surface, the 4th holographic reflecting surface, the plate face of horizontal holographic optical waveguide and vertical holographic optical waveguide is mutually vertical, and the second holographic reflecting surface is parallel to the 3rd holographic reflecting surface.
3. holographic optical waveguide helmet display optical system as claimed in claim 2, it is characterized in that: described relaying collimating optical system is selected three lens arrangements, intermediate lens is cemented doublet, the first lens of both sides and the 3rd lens are plano-convex lens, and convex surface is all towards horizontal holographic optical waveguide.
4. holographic optical waveguide helmet display optical system as claimed in claim 3 is characterized in that: described intermediate lens is a plano-convex lens and plano-concave lens gummed, and convex surface is all towards horizontal holographic optical waveguide.
5. holographic optical waveguide helmet display optical system as claimed in claim 4 is characterized in that:, the convex surface of described three lens is the even aspheric surface.
6. holographic optical waveguide helmet display optical system as described in claim 1 to 5 any one, it is characterized in that: the first holographic reflecting surface and the 3rd holographic reflecting surface use positive first-order diffraction, the second holographic reflecting surface and the 3rd holographic reflecting surface use negative first-order diffraction, on the second holographic reflecting surface and the 4th holographic reflecting surface, each zero level and first-order diffraction efficient remain unchanged.
7. holographic optical waveguide helmet display optical system as claimed in claim 6, it is characterized in that: the optical design index of described holographic optical waveguide helmet display optical system is:
Eye-point distance: 25mm;
Field angle: 20 ° * 15 °;
Image source: 0.67 inch; 4:3;
Emergent pupil: 10mm;
Spectral range: 495 ~ 530nm.
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| CN 201220600218 CN202975475U (en) | 2012-11-14 | 2012-11-14 | A holographic optical waveguide helmet display optical system |
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| CN 201220600218 CN202975475U (en) | 2012-11-14 | 2012-11-14 | A holographic optical waveguide helmet display optical system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928981A (en) * | 2012-11-14 | 2013-02-13 | 中航华东光电有限公司 | Optical system of holographic optical waveguide helmet display |
| CN104035157A (en) * | 2014-05-26 | 2014-09-10 | 北京理工大学 | Waveguide display based on diffractive optical element |
| CN105700143A (en) * | 2016-03-01 | 2016-06-22 | 陈超平 | Optical display device facing augment reality |
| CN106461851A (en) * | 2014-06-03 | 2017-02-22 | 大日本印刷株式会社 | Hologram, light transmitting reflective plate, screen, and projection system |
| JP2017090562A (en) * | 2015-11-05 | 2017-05-25 | セイコーエプソン株式会社 | Light flux diameter expansion element and display |
| CN111175976A (en) * | 2020-01-17 | 2020-05-19 | 歌尔股份有限公司 | Optical waveguide component, display system, augmented reality device and display method |
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2012
- 2012-11-14 CN CN 201220600218 patent/CN202975475U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928981A (en) * | 2012-11-14 | 2013-02-13 | 中航华东光电有限公司 | Optical system of holographic optical waveguide helmet display |
| CN102928981B (en) * | 2012-11-14 | 2016-08-03 | 中航华东光电有限公司 | Optical system of holographic optical waveguide helmet display |
| CN104035157A (en) * | 2014-05-26 | 2014-09-10 | 北京理工大学 | Waveguide display based on diffractive optical element |
| CN106461851A (en) * | 2014-06-03 | 2017-02-22 | 大日本印刷株式会社 | Hologram, light transmitting reflective plate, screen, and projection system |
| CN106461851B (en) * | 2014-06-03 | 2019-06-14 | 大日本印刷株式会社 | Hologram, translucency reflecting plate, screen and optical projection system |
| JP2017090562A (en) * | 2015-11-05 | 2017-05-25 | セイコーエプソン株式会社 | Light flux diameter expansion element and display |
| CN105700143A (en) * | 2016-03-01 | 2016-06-22 | 陈超平 | Optical display device facing augment reality |
| WO2017148232A1 (en) * | 2016-03-01 | 2017-09-08 | 上海群英软件有限公司 | Optical display device for augmented reality |
| CN111175976A (en) * | 2020-01-17 | 2020-05-19 | 歌尔股份有限公司 | Optical waveguide component, display system, augmented reality device and display method |
| CN111175976B (en) * | 2020-01-17 | 2022-02-22 | 歌尔股份有限公司 | Optical waveguide component, display system, augmented reality device and display method |
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Granted publication date: 20130605 |
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