CN112630978A - Large-field-angle eyepiece optical system and head-mounted display device - Google Patents
Large-field-angle eyepiece optical system and head-mounted display device Download PDFInfo
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- G02B27/01—Head-up displays
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- G—PHYSICS
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Abstract
本发明涉及一种大视场角的目镜光学系统及头戴显示装置，该系统包括从人眼观察侧到微型图像显示器侧沿光轴方向共轴依次排列的第一透镜组、第二透镜组和第三透镜组，第一透镜组、第二透镜组以及第三透镜组的有效焦距为正、负、正组合；第一透镜组包括靠近人眼侧的第一透镜和远离人眼侧的第二透镜；第一透镜组包括至少两个菲涅耳光学面；第一透镜包括至少一个菲涅耳光学面；第二透镜组沿光轴依次排列的第三透镜和第四透镜；第三透镜及第四透镜均为负透镜；第三透镜组包括沿光轴依次排列的第五透镜、第六透镜和第七透镜；第五透镜和第七透镜为正透镜；第六透镜为负透镜；观察者可观看到全画幅高清、无失真、像质均匀的画面，达到高临场感的视觉体验。
The invention relates to an eyepiece optical system with a large field of view and a head-mounted display device. The system comprises a first lens group and a second lens group which are coaxially arranged along the optical axis direction from the human eye observation side to the micro-image display side. and the third lens group, 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 includes a first lens close to the human eye side and a the second lens; the first lens group includes at least two Fresnel optical surfaces; the first lens includes at least one Fresnel optical surface; the second lens group includes a third lens and a fourth lens arranged in sequence along the optical axis; the third lens The lens and the fourth lens are both negative lenses; the third lens group includes a fifth lens, a sixth lens and a seventh lens arranged in sequence along the optical axis; the fifth lens and the seventh lens are positive lenses; the sixth lens is a negative lens ; Observers can watch full-frame high-definition, distortion-free, uniform image quality, and achieve a highly immersive visual experience.
Description
Technical Field
The invention relates to the technical field of optics, in particular to an eyepiece optical system with a large field angle and a head-mounted display device.
Background
With the continuous development of electronic devices towards ultra-miniaturization and the development of new computer, micro-electronics, photoelectric devices and communication theory and technology, the novel mode based on human-oriented and man-machine-in-one of wearable computing becomes possible. The method is continuously applied to the fields of military affairs, industry, medical treatment, education, consumption and the like. In a typical wearable computing system architecture, the head mounted display device is a key component. The head-mounted display device guides video image light emitted by a miniature image display (such as a transmission type or reflection type liquid crystal display, an organic electroluminescent device and a DMD device) to pupils of a user through an optical technology, realizes virtual and enlarged images in the near-eye range of the user, and provides visual and visible images, videos and character information for the user. The eyepiece optical system is the core of the head-mounted display device and realizes the function of displaying the miniature image in front of human eyes to form a virtual amplified image.
The head-mounted display device is developed in the directions of compact size, light weight, convenience in head mounting, load reduction and the like. Meanwhile, the large field angle and the visual comfort experience gradually become key factors for measuring the quality of the head-mounted display device, the large field angle determines the visual experience effect with high telepresence, and the high image quality and low distortion determine the comfort level of the visual experience. Meeting these requirements requires that the eyepiece optical system achieve as large an angle of view, high image resolution, low distortion, small curvature of field, small volume, etc., as possible, and meeting the above optical performance is a great challenge to the design and aberration optimization of the system.
Although the fresnel structures respectively adopted in patent document 1 (chinese patent publication No. CN109416469A), patent document 2 (chinese patent publication No. CN105759424B), patent document 3 (chinese patent publication No. CN107015361B), and patent document 4 (chinese patent publication No. CN111381371A) can achieve a good focusing effect in the optical system, the fresnel lenses are completely relied on in patent document 1 and patent document 3, and the fresnel lenses are combined with the single-piece and double-piece positive lenses in patent document 2 and patent document 4, which inevitably makes it difficult to build a tree in the aberration of the optical system, and has large distortion and spherical aberration.
Patent document 5 (chinese patent publication No. CN105278109A) provides an optical system using a combination of positive, negative, and positive lens groups, and provides an optical system using a combination of positive, negative, and positive lens groups, but patent document 5 uses a conventional spherical, even-order aspherical optical system, which has great advantages in correcting aberrations, but is extremely heavy under the same optical system parameters.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an eyepiece optical system and a head-mounted display device with a large angle of view, which achieve indexes such as a large angle of view, high image resolution, low distortion, small curvature of field, and small volume.
The technical scheme adopted by the invention for solving the technical problems is as follows: an eyepiece optical system with a large field angle is constructed, and comprises a first lens group, a second lens group and a third lens group which are coaxially and sequentially arranged along an optical axis direction from a human eye observation side to a miniature image display side, wherein 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 consists of two optical lenses, namely a first lens close to the human eye side and a second lens far away from the human eye side; the first lens group comprises at least two Fresnel optical surfaces; the first lens comprises at least one Fresnel optical surface;
the effective focal length of the optical system is set to be F, and the effective focal length of the first lens group is set to be F1Then F and F1Satisfies the following relation (1):
0.50≤f1/F≤1.33 (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 order along an optical axis; the third lens and the fourth lens are both negative lenses;
the third lens group is composed of two optical lenses; wherein the third lens group includes a fifth lens, a sixth lens, and a seventh lens arranged in order along an optical axis adjacent to the second lens group; the fifth lens and the seventh lens are positive lenses; 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):
1.49<Nd11<1.65 (2)；
1.49<Nd12<1.65 (3)；
wherein, Nd11、Nd12The refractive indexes of the first lens and the second lens at the d line are respectively.
Further, an effective focal length f of the first lens11And effective focal length f of the first lens group1Satisfies the following relation (4):
1.50≤f11/f1≤4.48 (4)。
further, the effective focal length of the optical system is F; an effective focal length of the second lens group is set to f2Then F, f2Satisfies the following relation (5):
-0.98≤f2/F≤-0.35 (5)。
further, the first lens group has an effective focal length f1An effective focal length of the third lens group is set to f3Then f is1、f3Satisfies the following relation (6):
0.02≤f1/f3≤2.15 (6)。
further, the first lens and the second lens respectively comprise one Fresnel optical surface.
Further, the two Fresnel optical surfaces are adjacently arranged.
Further, the two fresnel optical faces are both planar base fresnel optical faces.
Further, one or more optical surfaces of the first lens and the second lens are even aspheric surfaces; and the optical surfaces of the third lens and the fourth lens are both even aspheric surfaces.
Further, the third lens is a biconcave lens; the optical surface of the fourth lens far away from the human eye is convex to the human eye direction.
Further, the fifth lens is a biconvex lens; the optical surface of the sixth lens close to the human eye is concave towards the human eye direction; the optical surfaces of the seventh lens are all convex towards the human eyes.
Further, the third lens, the fourth lens and the sixth lens are made of optical glass or optical plastic.
Further, the expression of the aspherical surface is:
the invention also provides a head-mounted display device, which comprises a miniature image display and an eyepiece; the eyepiece is positioned between the human eye and the miniature image display; the eyepiece is the eyepiece optical system of any one of the preceding.
Further, the miniature image display is a transmissive liquid crystal display or a reflective liquid crystal display.
Further, the head mounted display device includes two identical and symmetrically arranged eyepiece optical systems.
The invention has the beneficial effects that: the combination of a double Fresnel optical surface type, a traditional optical spherical surface type and a traditional aspheric surface type is adopted, the combination of a positive lens group, a negative lens group and a positive lens group and the index advantages of large field angle, high image quality, low distortion, small curvature of field, small volume and the like of each lens are realized under the condition that the focal length of each lens meets the specific collocation condition, meanwhile, the weight of the optical system is also greatly reduced, the system aberration is greatly eliminated, the sensitivity of each optical component is reduced, the processing and the assembly of the components are easy, the indexes of field angle, curvature of field, distortion and the like in the optical system are further improved, and the visual comfort experience of a user is greatly improved. An observer can watch a full-frame high-definition large-size picture without distortion and uniform image quality through the eyepiece optical system, so that the visual experience of high telepresence is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only part of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the accompanying drawings:
fig. 1 is a schematic structural view of an eyepiece optical system of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a diffuse speckle array of an eyepiece optical system of a first embodiment of the present invention;
fig. 3 is a schematic distortion diagram of an eyepiece optical system of the first embodiment of the present invention;
fig. 4 is a schematic view of an optical transfer function MTF of the eyepiece optical system of the first embodiment of the present invention;
fig. 5 is a schematic configuration diagram of an eyepiece optical system of a second embodiment of the present invention;
FIG. 6 is a schematic diagram of a diffuse speckle array of an eyepiece optics system according to a second embodiment of the invention;
fig. 7 is a schematic distortion diagram of an eyepiece optical system of a second embodiment of the present invention;
fig. 8 is a schematic view of an optical transfer function MTF of an eyepiece optical system of a second embodiment of the present invention;
fig. 9 is a schematic configuration diagram of an eyepiece optical system of a third embodiment of the present invention;
FIG. 10 is a schematic view of a diffuse speckle array of an eyepiece optical system of a third embodiment of the present invention;
fig. 11 is a schematic distortion diagram of an eyepiece optical system of a third embodiment of the present invention;
fig. 12 is a schematic view of an optical transfer function MTF of an eyepiece optical system of a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
The invention constructs an eyepiece optical system with a large field angle, which comprises a first lens group, a second lens group and a third lens group which are coaxially and sequentially arranged along the direction of an optical axis from the observation side of a human eye to the side of a miniature image display, wherein the effective focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive; the first lens group consists of two optical lenses, namely a first lens close to the human eye side and a second lens far away from the human eye side; the first lens group comprises at least two Fresnel optical surfaces; the first lens comprises at least one Fresnel optical surface;
the effective focal length of the optical system is set to be F, and the effective focal length of the first lens group is set to be F1Then F and F1Satisfies the following relation (1):
0.50≤f1/F≤1.33 (1)；
wherein f is1The value of/F can be 0.50, 0.53, 0.67, 0.87, 0.99, 1.21, 1.29, 0.33, and the like.
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 order along an optical axis; the third lens and the fourth lens are both negative lenses;
the third lens group is composed of two optical lenses; wherein the third lens group includes a fifth lens, a sixth lens, and a seventh lens arranged in order along an optical axis adjacent to the second lens group; the fifth lens and the seventh lens are positive lenses; 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):
1.49<Nd11<1.65 (2)；
1.49<Nd12<1.65 (3)；
wherein, Nd11、Nd12The refractive indexes of the first lens and the second lens at the d line are respectively. The wavelength of the d line is 589.3nm, such as: E48R, K26R, EP3000, OKP1, and the like.
The first lens group, the second lens group and the third lens group are combined in a positive, negative and positive mode, and the lenses in the second lens group and the third lens group are combined in a negative, positive, negative and positive mode, so that aberration of the system is fully corrected, and optical resolution of the system is improved. More importantly, the first lens group adopts a double-Fresnel-surface structure, so that most of effective focal lengths in the optical system are shared, the difference of the outer diameters of the lenses is effectively reduced, the overall size of the eyepiece optical system is reduced, and the reliability of subsequent mass production is improved. And the second lens group can provide enough negative effective focal length to ensure that the eyepiece optical system can realize a sufficiently large field angle. Meanwhile, optical indexes such as a large field angle, low distortion, low chromatic aberration, low field curvature, low astigmatism and the like are realized, and an observer can watch a large-scale picture with full picture, high definition, no distortion and uniform image quality through the eyepiece optical system, so that the visual experience of high telepresence is achieved. The product is suitable for head-mounted displays and similar devices.
As shown in fig. 1, the lens comprises a first lens group, a second lens group and a third lens group which are sequentially arranged along the optical axis direction from the observation side of human eyes to the miniature image display; wherein, the serial number of the optical surface close to the side E of the human eye is 1, and so on (2, 3, 4, 5 and 6 from left to right), the light emitted from the miniature image display enters the human eye after being refracted by the third lens group, the second lens group and the first lens group in sequence.
In a further embodiment, the effective focal length f of the first lens is11And effective focal length f of the first lens group1Satisfies the following relation (4):
1.50≤f11/f1≤4.48 (4)。
wherein f is11/f1Values may be 1.50, 1.62, 1.83, 1.95, 2.21, 2.75, 2.98, 3.5, 3.89, 4.31, 4.48, etc.
In a further embodiment, the effective focal length of the optical system is F; effective focal length of the second lens group is set to f2，F、f2Satisfies the following relation (5):
-0.98≤f2/F≤-0.35 (5)。
wherein f is2The value of/F can be-0.98, -0.95, -0.82, -0.77, -0.57, -0.49, -0.41, -0.38, -0.35, etc.
In a further embodiment, the first lens group has an effective focal length f1The effective focal length of the third lens group is set to f3Then f is1、f3Satisfies the following relation (6):
0.02≤f1/f3≤2.15 (6)。
wherein f is1/f3Values may be taken as 0.02, 0.32, 0.47, 0.67, 0.89, 1.32, 1.55, 1.89, 2.01, 2.11, 2.15, etc.
F above1/F、f11/f1、f2(iv) F and F1/f3The value range of (a) is closely related to the correction of system aberration, the processing difficulty of the optical element and the sensitivity of the assembling deviation of the optical element, and f in the relational expression (1)1The value of/F is more than 0.5, so that the aberration of the system can be fully corrected, thereby realizing a high-quality optical effect, the value of the/F is less than 1.33, and the processability of an optical element in the system is improved; f in relation (4)11/f1The value of (A) is more than 1.5, so that the aberration of the system can be fully corrected, thereby realizing a high-quality optical effect, and the value of (B) is less than 4.48, thereby improving the processability of optical elements in the system; f in the relation (6)1/f3The value of (A) is more than 0.02, so that the aberration of the system can be fully corrected, thereby realizing a good optical effect, and the value of (B) is less than 2.15, thereby improving the processability of optical elements in the system. Relational expression (5)) In f2The value of/F is more than-0.95, so that the corresponding lens can provide enough negative effective focal length, the aberration of the correction system can be well balanced, a good optical effect is realized, the value of/F is less than-0.35, the correction difficulty of spherical aberration is reduced, and the realization of a large optical aperture is facilitated.
In a further embodiment, the first lens and the second lens each comprise a fresnel optical surface.
In a further embodiment, the two fresnel optical surfaces are adjacently disposed.
In a further embodiment, both Fresnel optical faces are planar base Fresnel optical faces.
In the above embodiment, the double fresnel optical surfaces in the eyepiece optical system are respectively disposed on the first lens and the second lens, and are disposed adjacently, that is, the optical surface of the first lens on the side away from the human eye is the fresnel surface, and the optical surface of the second lens on the side close to the human eye is the fresnel surface. The structure of double Fresnel surfaces is adopted, most effective focal lengths in the optical system are shared, the difference of the outer diameters of the lenses is effectively reduced, the overall size of the eyepiece optical system is reduced, and the reliability of follow-up mass production is improved.
In a further embodiment, one or more optical surfaces of the first lens and the second lens are even aspheric surfaces; and the optical surfaces of the third lens and the fourth lens are both even aspheric surfaces.
And further optimally correcting all levels of aberrations of the optical system. The optical performance of the eyepiece optical system is further improved.
In a further embodiment, the expression aspheric surface is:
wherein z is the rise of the optical surface, c is the curvature at the vertex of the aspheric surface, k is the aspheric coefficient, α 2,4,6 … are coefficients of each order, and r is the distance coordinate from a point on the surface to the optical axis of the lens system.
The aberration (including spherical aberration, coma, distortion, field curvature, astigmatism, chromatic aberration and other high-order aberrations) of the optical system is fully corrected, the eyepiece optical system is favorable for realizing large field angle and large aperture, further improving the image quality of a central field of view and an edge field of view, reducing the difference of the image quality of the central field of view and the edge field of view, and realizing more uniform image quality and low distortion in a full frame.
In a further embodiment, the third lens is a biconcave lens; the optical surface of the fourth lens far away from the human eye is convex to the human eye direction.
In a further embodiment, the fifth lens is a biconvex lens; the optical surface of the sixth lens close to the human eye is concave towards the human eye; the optical surfaces of the seventh lens are all convex towards the human eyes.
The embodiment further improves the astigmatic aberration, field curvature aberration and other aberrations of the system, and is beneficial to the eyepiece system to realize the high-resolution optical effect of uniform image quality of the whole picture.
The principle, scheme and display result of the eyepiece optical system are further described by the following more specific embodiments.
In the following embodiments, the stop E may be an exit pupil imaged by the eyepiece optical system, and is a virtual exit aperture, and when the pupil of the human eye is at the stop position, the best imaging effect can be observed.
First embodiment
The first embodiment eyepiece design data is shown in table one below:
FIG. 1 is a 2D structural view of an eyepiece optical system of a first embodiment, including a first lens group D1, a second lens group D2, and a third lens group D3 coaxially arranged in this order in the optical axis direction from the observation side of a human eye to the display device (IMG) side, the first lens group being composed of a first lens L1 and a second lens L2, and the first lens group D1 having two 2 nd and 3 rd optical surfacesA fresnel surface, the second lens group D2 is a negative effective focal length lens group composed of two negative effective focal length optical lenses, a third lens L3 and a fourth lens L4; the third lens group D3 is a positive effective focal length lens group composed of two positive effective focal length optical lenses and one negative effective focal length optical lens, and is a fifth lens L5, a sixth lens L6, and a seventh lens L7, respectively. Wherein the focal length F of the optical system is 29.30, and the effective focal length F of the first lens group D1114.65, the effective focal length f of the second lens group D22An effective focal length f of the third lens group D3 of-10.26315.48, the effective focal length f of the Fresnel lens closest to the human eye11Is 65.63, i.e. f1Has a/F of 0.50, F11/f1Is 4.48, f2A ratio of/F of-0.35, F1/f3Is 0.95.
Fig. 2, fig. 3 and fig. 4 are respectively a diffuse speckle array diagram, a distortion diagram and an optical transfer function MTF diagram of the optical system, which reflect that the light of each field of view of the present embodiment has a very high resolution and a very small optical distortion in a unit pixel of an image plane (display device (IMG)), the resolution per 10mm of a unit period reaches above 0.9, the aberration of the optical system is well corrected, and a uniform and high-optical-performance display image can be observed through the eyepiece optical system.
Second embodiment
The second embodiment eyepiece design data is shown in table two below:
watch two
FIG. 5 is a 2D structural view of an eyepiece optical system of a second embodiment including a first lens group D1, a second lens group D2, and a third lens group D3 coaxially arranged in this order in the optical axis direction from the observation side of a human eye to the display device (IMG) side, a first lens groupThe lens group consists of a first lens L1 and a second lens L2, the 2 nd optical surface and the 3 rd optical surface of the first lens group D1 are two Fresnel surfaces, the second lens group D2 is a negative effective focal length lens group consisting of two negative effective focal length optical lenses, namely a third lens L3 and a fourth lens L4; the third lens group D3 is a positive effective focal length lens group composed of two positive effective focal length optical lenses and one negative effective focal length optical lens, and is a fifth lens L5, a sixth lens L6, and a seventh lens L7, respectively. Compared with the first embodiment and the second embodiment, the main characteristics of the second embodiment are that each optical index is slightly lower, and the imaging quality is good. Wherein the focal length F of the optical system is 16.83, and the effective focal length F of the first lens group D1112.87, the effective focal length f of the second lens group D22An effective focal length f of the third lens group D3 of-16.493643.50, wherein the effective focal length f of the Fresnel lens is that close to the human eye11Is 19.30, i.e. f1Has a/F of 0.76, F11/f1Is 1.50, f2A ratio of/F of-0.98, F1/f3Is 0.02.
Fig. 6, 7 and 8 are respectively a diffuse speckle array diagram, a distortion diagram and an optical transfer function MTF diagram of the optical system, which reflect that the light of each field of view of the present embodiment has a high resolution and a small optical distortion in a unit pixel of an image plane (display device (IMG)), the resolution per 10mm of a unit period reaches above 0.8, the aberration of the optical system is well corrected, and a uniform display image with high optical performance can be observed through the eyepiece optical system.
Third embodiment
The third embodiment eyepiece design data is shown in table three below:
watch III
FIG. 9 is a 2D structural view of an eyepiece optical system of a third embodiment including a first lens group D1, a second lens group D2, and a third lens group D3 coaxially arranged in this order in the optical axis direction from the observation side of a human eye to the display device (IMG) sideThe first lens group consists of a first lens L1 and a second lens L2, the 2 nd and 3 rd optical surfaces of the first lens group D1 are two Fresnel surfaces, and the second lens group D2 is a negative effective focal length lens group consisting of two negative effective focal length optical lenses, namely a third lens L3 and a fourth lens L4; the third lens group D3 is a positive effective focal length lens group composed of two positive effective focal length optical lenses and one negative effective focal length optical lens, and is a fifth lens L5, a sixth lens L6, and a seventh lens L7, respectively. Compared with the first embodiment and the second embodiment, the main characteristics of the second embodiment are that each optical index is slightly lower, and the imaging quality is good. Wherein the focal length F of the optical system is 17.20, and the effective focal length F of the first lens group D1122.88, the effective focal length f of the second lens group D22An effective focal length f of the third lens group D3 of-15.63Is 10.64, wherein the effective focal length f of the Fresnel lens is that close to the human eye11Is 34.78, i.e. f1A ratio of/F of 1.33, F11/f1Is 1.52, f2A ratio of/F of-0.91, F1/f3Is 2.15.
Fig. 10, 11 and 12 are respectively a diffuse speckle array diagram, a distortion diagram and an optical transfer function MTF diagram of the optical system, which reflect that the light of each field of view of the present embodiment has a high resolution and a small optical distortion in a unit pixel of an image plane (display device (IMG)), and the resolution of a unit period per 10mm reaches above 0.9, the aberration of the optical system is well corrected, and a uniform and high-optical-performance display image can be observed through the eyepiece optical system.
The data of the above embodiments one to three all satisfy the parameter requirements recorded in the summary of the invention, and the results are shown in the following table four:
watch four
| f1/F | f11/f1 | f2/F | f1/f3 | |
| Example one | 0.50 | 4.48 | -0.35 | 0.95 |
| Example two | 0.76 | 1.50 | -0.98 | 0.02 |
| EXAMPLE III | 1.33 | 1.52 | -0.91 | 2.15 |
The invention also provides a catadioptric eyepiece optical device comprising two miniature image displays corresponding to the left and right eye positions of a person respectively, comprising the objective optical system as in any one of the above.
Preferably, the miniature image display is an organic electroluminescent device, a transmissive liquid crystal display or a reflective liquid crystal display.
In summary, the eyepiece optical system of each embodiment of the present invention utilizes the polarization property of light to realize refraction and reflection of a light path, and shorten the total length of the optical system, and in cooperation with the "positive, negative, and positive" combined lens group, the optical system can reduce the sensitivity of each optical component, and is easy to process and assemble the components, and particularly, optical indexes such as a large field angle, low distortion, low chromatic aberration, low curvature of field, low astigmatism, and the like are simultaneously realized.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (14)
1. An eyepiece optical system with a large field angle, characterized in that: the miniature image display device comprises a first lens group, a second lens group and a third lens group which are coaxially and sequentially arranged along the direction of an optical axis from the observation side of human eyes to the miniature image display side, wherein the effective focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive; the first lens group consists of two optical lenses, namely a first lens close to the human eye side and a second lens far away from the human eye side; the first lens group comprises at least two Fresnel optical surfaces; the first lens comprises at least one Fresnel optical surface;
the effective focal length of the optical system is set to be F, and the effective focal length of the first lens group is set to be F1Then F and F1Satisfies the following relation (1):
0.50≤f1/F≤1.33 (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 order along an optical axis; the third lens and the fourth lens are both negative lenses;
the third lens group is composed of two optical lenses; wherein the third lens group includes a fifth lens, a sixth lens, and a seventh lens that are adjacent to the second lens group and are arranged in order along an optical axis; the fifth lens and the seventh lens are positive lenses; 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):
1.49<Nd11<1.65 (2)；
1.49<Nd12<1.65 (3)；
wherein, Nd11、Nd12The refractive indexes of the first lens and the second lens at the d line are respectively.
2. The large-field-angle eyepiece optical system of claim 1, wherein an effective focal length f of the first lens is11And effective focal length f of the first lens group1Satisfies the following relation (4):
1.50≤f11/f1≤4.48 (4)。
3. a large-field-angle eyepiece optical system according to claim 1, wherein the effective focal length of the optical system is F; an effective focal length of the second lens group is set to f2Then F, f2Satisfies the following relation (5):
-0.98≤f2/F≤-0.35 (5)。
4. a large-field-angle eyepiece optical system according to claim 1, wherein an effective focal length of the first lens group is f1An effective focal length of the third lens group is set to f3Then f is1、f3Satisfies the following relation (6):
0.02≤f1/f3≤2.15 (6)。
5. an eyepiece optical system with a large field angle as recited in claim 1, wherein each of said first lens and said second lens includes one of said fresnel optical surfaces.
6. The large-field-angle eyepiece optical system of claim 5, wherein the two fresnel optical surfaces are adjacently disposed.
7. A large field angle eyepiece optical system as recited in claim 5, wherein both Fresnel optical faces are planar base Fresnel optical faces.
8. The large-field-angle eyepiece optical system according to claim 1, wherein one or more optical surfaces of the first lens and the second lens are even aspheric surfaces; and the optical surfaces of the third lens and the fourth lens are both even aspheric surfaces.
9. The large-field-angle eyepiece optical system according to claim 1, wherein the third lens is a biconcave lens; the optical surface of the fourth lens far away from the human eye is convex to the human eye direction.
10. The large-field-angle eyepiece optical system according to claim 1, wherein the fifth lens is a biconvex lens; the optical surface of the sixth lens close to the human eye is concave towards the human eye direction; the optical surfaces of the seventh lens are all convex towards the human eyes.
11. The large-field-angle eyepiece optical system of claim 1, wherein the material of the third lens, the fourth lens, and the sixth lens is optical glass or optical plastic.
12. A head-mounted display device includes a miniature image display and an eyepiece; the eyepiece is positioned between the human eye and the miniature image display; characterized in that the eyepiece is the eyepiece optical system of any one of claims 1-11.
13. The head-mounted display device of claim 12, wherein the miniature image display is an organic electroluminescent device, a transmissive liquid crystal display, or a reflective liquid crystal display.
14. The head mounted display device of claim 12 or 13, wherein the head mounted display device comprises two identical and symmetrically arranged eyepiece optical systems.
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