WO2022141383A1 - Système optique oculaire de grand angle de champ de visualisation et dispositif d'affichage monté sur la tête - Google Patents

Système optique oculaire de grand angle de champ de visualisation et dispositif d'affichage monté sur la tête Download PDF

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Publication number
WO2022141383A1
WO2022141383A1 PCT/CN2020/142070 CN2020142070W WO2022141383A1 WO 2022141383 A1 WO2022141383 A1 WO 2022141383A1 CN 2020142070 W CN2020142070 W CN 2020142070W WO 2022141383 A1 WO2022141383 A1 WO 2022141383A1
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lens
lens group
optical
optical system
eyepiece
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PCT/CN2020/142070
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English (en)
Chinese (zh)
Inventor
曹鸿鹏
郭健飞
彭华军
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深圳纳德光学有限公司
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Priority to PCT/CN2020/142070 priority Critical patent/WO2022141383A1/fr
Publication of WO2022141383A1 publication Critical patent/WO2022141383A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • 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

Definitions

  • the present invention relates to the field of optical technology, and more particularly, to an eyepiece optical system with a large viewing angle and a head-mounted display device.
  • wearable computing a new model based on "people-oriented” and “human-machine integration” has become possible.
  • Applications continue to emerge in military, industrial, medical, education, consumer and other fields.
  • the head-mounted display device is a key component.
  • the head-mounted display device guides the video image light emitted by the miniature image display (such as transmissive or reflective liquid crystal display, organic electroluminescent device, DMD device) to the user's pupil through optical technology, and the user's near vision
  • the scope realizes virtual and enlarged images, and provides users with intuitive and visible images, videos, and text information.
  • the eyepiece optical system is the core of the head-mounted display device, which realizes the function of displaying a miniature image in front of the human eyes to form a virtual magnified image.
  • the head-mounted display device is developing towards the direction of compact size, light weight, easy to wear on the head and lightening of the load.
  • large field of view and visual comfort have gradually become the key factors to measure the quality of head-mounted display devices.
  • Large field of view determines the effect of high-presence visual experience, and high image quality and low distortion determine the comfort of visual experience.
  • Spend. To meet these requirements, it is necessary for the eyepiece optical system to achieve a large field of view, high image resolution, low distortion, small field curvature, and small volume as much as possible. At the same time, satisfying the above optical performance is very important for system design and aberration optimization. challenge.
  • Patent Document 1 Choinese Patent Publication No. CN109416469A
  • Patent Document 2 Choinese Patent Publication No. CN105759424B
  • Patent Document 3 Choinese Patent Publication No. CN107015361B
  • Patent Document 4 Choinese Patent Publication No. CN111381371A
  • Patent Document 1 and Patent Document 3 completely rely on Fresnel lenses
  • Patent Documents 2 and 4 are Fresnel lenses and single and double positive lenses. Combined, it is inevitable that it is difficult to make achievements in the aberration of the optical system, and there is a large distortion and spherical aberration.
  • Patent Document 5 Choinese Patent Publication No. CN105278109A provides an optical system using a combination of positive, negative, and positive lens groups, and provides an optical system that uses a combination of positive, negative, and positive lens groups. It is a traditional spherical and even-order aspheric optical system. Although it has great advantages in aberration correction, it is extremely cumbersome under the same optical system parameters.
  • the technical problem to be solved by the present invention is to provide an eyepiece optical system and a head-mounted display device with a large field of view in view of the above-mentioned defects of the prior art, which can achieve a large field of view, high image resolution, low distortion, and a small field of view. Curve, small volume and other indicators.
  • the technical solution adopted by the present invention to solve the technical problem is: constructing an eyepiece optical system with a large field of view, comprising a first lens group, a first lens group, The second lens group and the third lens group, and the effective focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive combinations; the first lens group is composed of two The first lens group includes at least two Fresnel optical surfaces; the first lens includes at least one Describe the Fresnel optical surface;
  • the effective focal length of the optical system is set to F, and the effective focal length of the first lens group is set to f 1 , then F and f 1 satisfy the following relational formula (1):
  • the second lens group is composed of two optical lenses; wherein the second lens group includes a third lens and a fourth lens adjacent to the first lens group and arranged in sequence along the optical axis; the third lens and the fourth lens is a negative lens;
  • the third lens group is composed of two optical lenses; wherein the third lens group includes a fifth lens and a sixth lens adjacent to the second lens group and arranged in sequence along the optical axis; the fifth lens is a positive lens; the sixth lens is a negative lens;
  • the material properties of the first lens and the second lens satisfy the following relational expressions (2) and (3):
  • Nd 11 and Nd 12 are the refractive indices of the first lens and the second lens at the d-line, respectively.
  • the effective focal length f 11 of the first lens and the effective focal length f 1 of the first lens group satisfy the following relational formula (4):
  • the effective focal length of the optical system is F;
  • the optical power of the second lens group is set to f 2 , and F and f 2 satisfy the following relational formula (5):
  • f 1 and f 3 satisfy the following relational formula (6):
  • each of the first lens and the second lens includes one of the Fresnel optical surfaces.
  • the two Fresnel optical surfaces are arranged adjacently.
  • the two Fresnel optical surfaces are both plane base Fresnel optical surfaces.
  • one or more optical surfaces of the first lens and the second lens are even-order aspheric surfaces; the optical surfaces of the third lens and the fourth lens are even-order aspheric surfaces.
  • the third lens is a biconcave lens.
  • the fifth lens is a biconvex lens.
  • the material of the third lens, the fourth lens and the sixth lens is optical glass or optical plastic.
  • the present invention also provides a head-mounted display device, comprising a miniature image display and an eyepiece; the eyepiece is located between the human eye and the microscopic image display; the eyepiece is the eyepiece optical system described in any one of the foregoing.
  • the micro-image display is an organic electroluminescence light-emitting device, a transmissive liquid crystal display or a reflective liquid crystal display.
  • the head-mounted display device includes two identical and symmetrically arranged eyepiece optical systems.
  • the beneficial effects of the invention are: a combination of a double Fresnel optical surface type and a traditional optical spherical surface and aspherical surface type is adopted, and the combination of positive, negative and positive lens groups and the focal length of each lens can meet specific matching conditions. While achieving the advantages of large field of view, high image quality, low distortion, small field curvature, small volume and other indicators under the condition of It reduces the sensitivity of each optical component, facilitates the processing and assembly of the components, further improves the field of view, field curvature, distortion and other indicators in the optical system, and greatly improves the user's visual comfort experience. Through the eyepiece optical system of the present invention, an observer can watch a large-scale picture with full-frame high-definition, no distortion, and uniform image quality, so as to achieve a high-presence visual experience.
  • FIG. 1 is a schematic structural diagram of an eyepiece optical system according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of a diffused spot array of the eyepiece optical system according to the first embodiment of the present invention
  • Fig. 3 is the distortion schematic diagram of the eyepiece optical system of the first embodiment of the present invention.
  • FIG. 4 is a schematic diagram of the optical transfer function MTF of the eyepiece optical system according to the first embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an eyepiece optical system according to a second embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a speckle array of an eyepiece optical system according to a second embodiment of the present invention.
  • Fig. 7 is the distortion schematic diagram of the eyepiece optical system of the second embodiment of the present invention.
  • FIG. 8 is a schematic diagram of the optical transfer function MTF of the eyepiece optical system according to the second embodiment of the present invention.
  • the present invention constructs an eyepiece optical system with a large field of view, comprising a first lens group, a second lens group and a third lens group which are coaxially arranged in sequence along the optical axis from the observation side of the human eye to the side of the micro-image display, and
  • the effective focal lengths of the first lens group, the second lens group and the third lens group are a combination of positive, negative and positive;
  • the first lens group is composed of two optical lenses, which are the first lens close to the human eye and the first lens away from the human eye.
  • the effective focal length of the optical system is set to F, and the effective focal length of the first lens group is set to f 1 , then F and f 1 satisfy the following relational formula (1):
  • f 1 /F can be 0.5, 0.53, 0.67, 0.87, 0.99, 1.21, 1.29, 0.33 and so on.
  • the second lens group is composed of two optical lenses; the second lens group includes a third lens and a fourth lens adjacent to the first lens group and arranged in sequence along the optical axis; the third lens and the fourth lens are both negative lenses ;
  • the third lens group is composed of two optical lenses; the third lens group includes a fifth lens and a sixth lens that are adjacent to the second lens group and are arranged in sequence along the optical axis; the fifth lens is a positive lens; the sixth lens is a negative lens lens;
  • Nd 11 and Nd 12 are the refractive indices of the first lens and the second lens at the d-line, respectively.
  • the wavelength of the d-line is 589.3 nm.
  • the materials of the first lens and the second lens are optional: E48R, K26R, EP3000, OKP1, etc.
  • the first lens group, the second lens group and the third lens group adopt the combination of positive, negative and positive
  • the second lens group and each lens in the third lens group adopt the combination of negative, negative, positive and negative
  • the aberration of the system is corrected and the optical resolution of the system is improved.
  • the structure of double Fresnel surfaces is adopted in the first lens group, which shares most of the optical power in the optical system, effectively reduces the difference in the outer diameter of each lens, and reduces the size of the eyepiece.
  • the overall size of the optical system improves the reliability of subsequent mass production.
  • the second lens group can provide enough negative refractive power to ensure that the eyepiece optical system can achieve a large enough angle of view.
  • optical indicators such as large field of view, low distortion, low chromatic aberration, low field curvature, and low astigmatism are realized.
  • the observer can watch a large picture with full-frame high-definition, no distortion and uniform image quality. Achieving a highly immersive visual experience.
  • This product is intended for use with head mounted displays and similar devices.
  • FIG. 1 it includes a first lens group, a second lens group, and a third lens group arranged in sequence along the optical axis direction from the observation side of the human eye to the micro-image display;
  • the surface number is 1, and so on (from left to right: 2, 3, 4, 5, 6...), the light emitted from the micro-image display goes through the third lens group, the second lens group , After the first lens group is refracted, it enters the human eye.
  • the effective focal length f 11 of the first lens and the effective focal length f 1 of the first lens group satisfy the following relational formula (4):
  • f 11 /f 1 can be 1.5, 1.62, 1.83, 1.95, 2.21, 2.75, 2.98, 3.5, 3.89, 4.31, 4.48 and so on.
  • the effective focal length of the optical system is F; the optical power of the second lens group is set to f 2 , and F and f 2 satisfy the following relational formula (5):
  • f 2 /F can be -0.98, -0.95, -0.82, -0.77, -0.57, -0.49, -0.41, -0.38, -0.35 and so on.
  • the effective focal length of the first lens group is f 1
  • the optical power of the third lens group is set to f 3 , then f 1 and f 3 satisfy the following relational formula (6):
  • f 1 /f 3 can be 0.02, 0.32, 0.47, 0.67, 0.89, 1.32, 1.55, 1.89, 2.01, 2.11, 2.15 and so on.
  • f 1 /F, f 11 /f 1 , f 2 /F and f 1 /f 3 are closely related to the correction of system aberrations, the processing difficulty of optical components, and the sensitivity of optical component assembly deviations.
  • the value of f 1 /F in formula (1) is greater than 0.5, so that the aberration of the system can be fully corrected, so as to achieve high-quality optical effects, and the value of f 1 /F is less than 1.33, which improves the machinability of the optical elements in the system; relation;
  • the value of f 11 /f 1 is greater than 1.5, so that the aberration of the system can be fully corrected, thereby achieving high-quality optical effects, and the value of f 11 /f 1 is less than 4.48, which improves the processability of the optical elements in the system;
  • the value of f 1 /f 3 in the relation (6) is greater than 0.02, so that the aberration of the system can be fully corrected, thereby achieving high-quality optical effects, and the value of f 1 /f 3 is less than 2.15, which improves the machinability of the optical elements in the system .
  • f 2 /F in the relationship (5) is greater than -0.95, so that the corresponding lens can provide sufficient negative power, so as to better balance and correct system aberrations and achieve good optical effects. Less than -0.35 reduces the difficulty of spherical aberration correction and facilitates the realization of large optical apertures.
  • the first lens and the second lens respectively include a Fresnel optical surface.
  • the two Fresnel optical surfaces are arranged adjacently.
  • both Fresnel optical surfaces are planar base Fresnel optical surfaces.
  • the double Fresnel optical surfaces in the eyepiece optical system are respectively arranged on the first lens and the second lens, and are arranged in an adjacent manner, that is, the optical surface of the first lens away from the human eye is Fresnel.
  • the ear surface, the optical surface of the second lens close to the human eye side is the Fresnel surface.
  • the structure of double Fresnel surfaces is adopted, which shares most of the optical power in the optical system, effectively reduces the difference in the outer diameter of each lens, reduces the overall size of the eyepiece optical system, and improves the follow-up volume. production reliability.
  • one or more optical surfaces in the first lens and the second lens are even-order aspheric surfaces; and the optical surfaces in the third lens and the fourth lens are even-order aspheric surfaces.
  • the aberrations at all levels of the optical system are further optimized and corrected.
  • the optical performance of the eyepiece optical system is further improved.
  • the expression for the aspheric surface is:
  • z is the sag of the optical surface
  • c is the curvature at the vertex of the aspheric surface
  • k is the aspheric coefficient
  • ⁇ 2, 4, 6... are the coefficients of each order
  • r is the distance coordinate from the point on the surface to the optical axis of the lens system.
  • the aberrations of the optical system are fully corrected, which is beneficial for the eyepiece optical system to achieve a large field of view .
  • the image quality of the central field of view and the edge of the field of view is further improved, the difference between the image quality of the center and the edge of the field of view is reduced, and the image quality and low distortion in the full frame are more uniform.
  • the third lens is a biconcave lens.
  • the fifth lens is a biconvex lens.
  • the material of the third lens, the fourth lens and the sixth lens is optical glass or optical plastic.
  • the above-mentioned embodiments further improve aberrations such as astigmatism and field curvature of the system, which is beneficial for the eyepiece system to achieve a high-resolution optical effect of uniform image quality across the entire frame.
  • the diaphragm E may be the exit pupil of the eyepiece optical system for imaging, which is a virtual light exit aperture.
  • the pupil of the human eye is at the diaphragm position, the best imaging effect can be observed.
  • the eyepiece design data of the first embodiment are shown in Table 1 below:
  • 1 is a 2D structural diagram of the eyepiece optical system of the first embodiment, including a first lens group D1, a second lens group D2 and a first lens group D1, a second lens group D2 and The third lens group D3, the first lens group is composed of a first lens L1 and a second lens L2, the second and third optical surfaces of the first lens group D1 are composed of two Fresnel surfaces, and the second lens group D2 is The negative refractive power lens group composed of two negative refractive power optical lenses is the third lens L3 and the fourth lens L4 respectively; the third lens group D3 is composed of a positive refractive power optical lens and a negative refractive power optical lens.
  • the positive refractive power lens group formed by the lenses is the fifth lens L5 and the sixth lens L6 respectively.
  • the focal length F of the optical system is 21.17
  • the effective focal length f1 of the first lens group D1 is 17.53
  • the refractive power f2 of the second lens group D2 is -17.27
  • the refractive power f3 of the third lens group D3 is 25.72
  • the effective focal length f 11 of the Fresnel lens close to the human eye is 78.50, that is, f 1 /F is 0.83
  • f 11 /f 1 is 4.48
  • f 2 /F is -0.82
  • f 1 /f 3 is 0.68 .
  • Accompanying drawing 2, accompanying drawing 3, accompanying drawing 4 are the scattered spot array diagram, the distortion diagram and the optical transfer function MTF diagram of the optical system, respectively, reflecting the light of each field of view in the present embodiment on the image plane (display device (IMG)
  • the unit pixel of 1) has very high resolution and very little optical distortion, the resolution per 10mm per unit period reaches more than 0.5, the aberration of the optical system is well corrected, and uniform, high optical quality can be observed through the eyepiece optical system. Display portrait of performance.
  • the eyepiece design data of the second embodiment are shown in Table 2 below:
  • FIG. 5 is a 2D structural diagram of the eyepiece optical system of the second embodiment, including a first lens group D1, a second lens group D2 and a first lens group D1, a second lens group D2 and The third lens group D3, the first lens group is composed of a first lens L1 and a second lens L2, the second and third optical surfaces of the first lens group D1 are composed of two Fresnel surfaces, and the second lens group D2 is The negative refractive power lens group composed of two negative refractive power optical lenses is the third lens L3 and the fourth lens L4 respectively; the third lens group D3 is composed of a positive refractive power optical lens and a negative refractive power optical lens.
  • the positive refractive power lens group formed by the lenses is the fifth lens L5 and the sixth lens L6 respectively.
  • the main feature of the second embodiment is that its various optical indicators are slightly lower, and the imaging quality is good.
  • the focal length F of the optical system is 20.79
  • the effective focal length f1 of the first lens group D1 is 14.90
  • the refractive power f2 of the second lens group D2 is -11.95
  • the refractive power f3 of the third lens group D3 is 17.76
  • the effective focal length f 11 of the Fresnel lens close to the human eye is 25.75, that is, f 1 /F is 0.72
  • f 11 /f 1 is 1.73
  • f 2 /F is -0.57
  • f 1 /f 3 is 0.84 .
  • Fig. 6, Fig. 7, Fig. 8 are the scattered spot array diagram, the distortion diagram and the optical transfer function MTF diagram of the optical system, respectively, reflecting the light of each field of view in the present embodiment on the image plane (display device (IMG)
  • the unit pixel of 1) has very high resolution and very little optical distortion, the resolution per 10mm per unit period reaches more than 0.8, the aberration of the optical system is well corrected, and uniform, high optical quality can be observed through the eyepiece optical system. Display portrait of performance.
  • the eyepiece design data of the third embodiment are shown in Table 3 below:
  • FIG. 9 is a 2D structural diagram of the eyepiece optical system of the third embodiment, including a first lens group D1, a second lens group D2 and a first lens group D1, a second lens group D2 and The third lens group D3, the first lens group is composed of a first lens L1 and a second lens L2, the second and third optical surfaces of the first lens group D1 are composed of two Fresnel surfaces, and the second lens group D2 is The negative refractive power lens group composed of two negative refractive power optical lenses is the third lens L3 and the fourth lens L4 respectively; the third lens group D3 is composed of a positive refractive power optical lens and a negative refractive power optical lens.
  • the positive refractive power lens group formed by the lenses is the fifth lens L5 and the sixth lens L6 respectively.
  • the main feature of the second embodiment is that its various optical indicators are slightly lower, and the imaging quality is good.
  • the focal length F of the optical system is 18.22
  • the optical focal length f1 of the first lens group D1 is 12.71
  • the optical power f2 of the second lens group D2 is -11.03
  • the optical power f3 of the third lens group D3 is 15.24
  • the optical focal length f 11 of the Fresnel lens close to the human eye is 27.89, that is, f 1 /F is 0.70
  • f 11 /f 1 is 2.19
  • f 2 /F is -0.61
  • f 1 /f 3 is 0.83 .
  • Fig. 10, Fig. 11, Fig. 12 are the diffused spot array diagram, distortion diagram and optical transfer function MTF diagram of the optical system, respectively, which reflect the light of each field of view in this embodiment on the image plane (display device (IMG)
  • the unit pixel of I) has very high resolution and very little optical distortion, the resolution per 10mm per unit period reaches more than 0.65, the aberration of the optical system is well corrected, and uniform, high optical quality can be observed through the eyepiece optical system. Display portrait of performance.
  • the present invention also provides a head-mounted display device, comprising a miniature image display and an eyepiece; the eyepiece is located between the human eye and the miniature image display; the eyepiece is the eyepiece optical system of any one of the foregoing.
  • the miniature image display is an organic electroluminescent device, a transmissive liquid crystal display or a reflective liquid crystal display.
  • the head mounted display device comprises two identical and symmetrically arranged eyepiece optical systems.
  • the eyepiece optical system of the above-mentioned embodiments of the present invention adopts a combination of a double Fresnel optical surface and a traditional optical spherical and aspherical surface, combined with a combination of positive, negative and positive lens groups and each lens
  • the focal length of the optical system achieves its advantages of large field of view, high image quality, low distortion, small field curvature, small volume and other indicators under the condition of meeting specific matching conditions, and also greatly reduces the weight of the optical system.
  • the system aberration is greatly eliminated, the sensitivity of each optical component is reduced, the processing and assembly of the components are easy, and the field of view, field curvature, distortion and other indicators in the optical system are further improved, and the user's visual comfort experience is greatly improved.
  • an observer can watch a large-scale picture with full-frame high-definition, no distortion and uniform image quality, so as to achieve a visual experience with a high sense of presence.

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Abstract

L'invention concerne un système optique oculaire de grand champ de visualisation et un dispositif d'affichage monté sur la tête. Le système optique oculaire comprend un premier groupe de lentilles (D1), un deuxième groupe de lentilles (D2), et un troisième groupe de lentilles (D3) qui sont disposés coaxialement en séquence d'un côté d'observation de l'œil humain à un affichage d'image miniature (IMG) le long de la direction d'un axe optique, et des longueurs focales effectives du premier groupe de lentilles (D1), le deuxième groupe de lentilles (D2) et le troisième groupe de lentilles (D3) sont une combinaison positive, négative et positive. Le premier groupe de lentilles (D1) comprend une première lentille (L1) proche du côté de l'œil humain et une deuxième lentille (L2) à distance du côté œil humain ; le premier groupe de lentilles (D1) comprend au moins deux surfaces optiques de Fresnel ; la première lentille (L1) comprend au moins une surface optique de Fresnel. Le deuxième groupe de lentilles (D2) comprend une troisième lentille (L3) et une quatrième lentille (L4) qui sont adjacentes au premier groupe de lentilles (D1) et agencées en séquence le long de L'axe optique ; la troisième lentille (L3) et la quatrième lentille (L4) sont toutes deux des lentilles négatives. Le troisième groupe de lentilles (D3) comprend une cinquième lentille (L5) et une sixième lentille (L6) qui sont adjacentes au deuxième groupe de lentilles (D2) et agencées en séquence le long de l'axe optique ; la cinquième lentille (L5) est une lentille positive ; la sixième lentille (L6) est une lentille négative. La présente invention présente les avantages d'un grand angle de champ de vision, d'une qualité d'image élevée, d'une faible distorsion, d'une petite courbure de champ et d'un petit volume.
PCT/CN2020/142070 2020-12-31 2020-12-31 Système optique oculaire de grand angle de champ de visualisation et dispositif d'affichage monté sur la tête WO2022141383A1 (fr)

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