CN112630975B - Eyepiece optical system with large field angle and head-mounted display device - Google Patents
Eyepiece optical system with large field angle and head-mounted display device Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 224
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- 239000005304 optical glass Substances 0.000 claims description 3
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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Abstract
The invention relates to an eyepiece optical system with a large field angle and a head-mounted display device, wherein the system comprises a first lens group, a second lens group and a third lens group which are coaxially and sequentially arranged along the optical axis direction from the observation side of human eyes to the micro display side, and the optical 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 includes at least one fresnel optical surface; the second lens group comprises a third lens and a fourth lens which are adjacent to the first lens group and are sequentially arranged along the optical axis; the third lens and the fourth lens are both negative lenses; the third lens group is composed of one piece of optical lens; the third lens group includes a fifth lens; the fifth lens is a positive lens; the optical lens has the advantages of large field angle, high image quality, low distortion, small field curvature, small volume and the like.
Description
Technical Field
The present invention relates to the field of optical technology, and more particularly, to an eyepiece optical system with a large angle of view and a head-mounted display device.
Background
With the continuous development of electronic devices to ultra-miniaturization and the development of new computer, microelectronic, photoelectric devices and communication theory and technology, wearable computing has become possible in a novel mode based on "artificial basis" and "man-machine integration". The method is continuously applied in the fields of military, industry, medical treatment, education, consumption and the like. In a typical wearable computing system architecture, a head mounted display device is a critical 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 screen, an organic electroluminescent device and a DMD device) to the pupil 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 image, video and text information for the user. The eyepiece optical system is a core of the head-mounted display device, and achieves the function of displaying a miniature image in front of human eyes to form a virtual enlarged image.
The head-mounted display device is compact in size, light in weight, convenient to wear, and capable of reducing load and the like. Meanwhile, the large field angle and the visual comfort experience gradually become key factors for measuring the advantages and disadvantages of the head-mounted display device, the large field angle determines the visual experience effect of high realistic sensation, and the high image quality and the low distortion determine the comfort level of the visual experience. Meeting these requirements requires that eyepiece optics achieve as large an angle of view, high image resolution, low distortion, small curvature of field, small volume, etc. as possible, while meeting the above optical performance is a great challenge for system design and aberration optimization.
The fresnel structures adopted in patent document 1 (chinese patent publication No. CN109416469 a), patent document 2 (chinese patent publication No. CN 105759424B), patent document 3 (chinese patent publication No. CN 107015361B) and patent document 4 (chinese patent publication No. CN111381371 a) each achieve a good focusing effect in the optical system, but the fresnel lenses are completely relied on in patent document 1 and patent document 3, and the fresnel lenses are combined with single-piece and double-piece positive lenses in patent document 2 and patent document 4, which inevitably have a built-in tree in aberration of the optical system, and have a large distortion and spherical aberration.
Patent document 5 (chinese patent publication No. CN105278109 a) provides an optical system using a combination of positive, negative, and positive lens groups, but patent document 5 uses a conventional spherical, even aspherical optical system, which is extremely heavy under the same optical system parameters, although it has great advantages in correction of aberrations.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an eyepiece optical system with a large field angle and a head-mounted display device aiming at the defects in the prior art, and the eyepiece optical system and the head-mounted display device realize indexes such as large field angle, high image resolution, low distortion, small field curvature, small volume and the like.
The technical scheme adopted for solving the technical problems is as follows: constructing a large-field-angle eyepiece optical system, which 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 micro display side, wherein optical 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; said first lens comprising at least one of said fresnel optical faces;
the optical focal length of the optical system is set to be F, the optical focal length of the first lens group is set to be F 1, and F 1 satisfy 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 sequentially arranged along an optical axis; the third lens and the fourth lens are both negative lenses;
The third lens group is composed of one optical lens; wherein the third lens group includes a fifth lens adjacent to the second lens group; the fifth lens is a positive lens;
The material characteristics of the first and second lenses satisfy the following relational expressions (2), (3):
1.49<Nd11<1.70 (2)；
1.49<Nd12<1.70 (3)；
Wherein Nd 11、Nd12 is the refractive index of the first lens and the second lens at d-line, respectively.
Further, the optical focal length f 11 of the first lens and the optical focal length f 1 of the first lens group satisfy the following relation (4):
1.50≤f11/f1≤4.48 (4)。
further, each of the first lens and the second lens comprises one Fresnel optical surface.
Further, the two Fresnel optical surfaces are adjacently arranged.
Further, the basal surfaces of the two Fresnel optical surfaces are plane or aspheric surfaces.
Further, the optical focal length of the optical system is F; the optical power of the second lens group is set to f 2,F、f2 to satisfy the following relation (5):
-0.98≤f2/F≤-0.35 (5)。
Further, the optical focal length of the first lens group is f 1, the optical power of the third lens group is f 3, and f 1、f3 satisfies the following relational expression (6):
0.02≤f1/f3≤2.15 (6)。
further, the two Fresnel optical surfaces are both plane-based Fresnel optical surfaces.
Further, the expression of the aspherical surface is:
Further, the first lens and the second lens each comprise at least one even aspherical optical surface; the optical surfaces of the third lens and the fourth lens are even aspheric surfaces.
Further, the third lens is a biconcave lens.
Further, the materials of the third lens, the fourth lens and the fifth lens are all optical glass or optical resin.
Further, the fifth lens is a biconvex lens.
Further, the fourth lens is far away from the optical film on the human eye side and protrudes towards the human eye direction.
The invention also provides a head-mounted display device, which comprises a micro display and an ocular; the ocular is positioned between the human eye and the micro display; the eyepiece is the eyepiece optical system of any one of the preceding claims.
Further, the micro display is an organic electroluminescent light emitting device, a transmissive liquid crystal display or a reflective liquid crystal display.
Further, the head-mounted display device includes two identical and symmetrically disposed eyepiece optical systems.
The invention has the beneficial effects that: the combination of the double Fresnel optical surface type and the traditional optical spherical surface and the aspheric surface type is adopted, and the combination of the positive lens group, the negative lens group and the positive lens group and the focal length of each lens are combined under the condition that specific collocation conditions are met, so that the advantages of indexes such as large field angle, high image quality, low distortion, small field curvature and small volume are realized, meanwhile, the weight of an optical system is greatly reduced, the aberration of the system is greatly eliminated, the sensitivity of each optical component is reduced, the processing and the assembly of the components are easy, the indexes such as field angle, field curvature and distortion in the optical system are further improved, and the visual comfort experience of a user is greatly improved. The observer can observe a large picture with high definition, no distortion and uniform image quality through the ocular optical system of the invention, thereby achieving the visual experience of high realistic sensation.
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, in which the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained by those skilled in the art without inventive effort:
Fig. 1 is a schematic structural view of an eyepiece optical system according to a first embodiment of the invention;
FIG. 2 is a schematic view of a diffuse spot array of an eyepiece optical system according to a first embodiment of the invention;
fig. 3 is a schematic view showing distortion of an eyepiece optical system according to a first embodiment of the invention;
fig. 4 is a schematic view of the optical transfer function MTF of the eyepiece optical system of the first embodiment of the invention;
Fig. 5 is a schematic structural view of an eyepiece optical system according to a second embodiment of the invention;
FIG. 6 is a schematic view of a diffuse spot array of an ocular optical system of a second embodiment of the present invention;
Fig. 7 is a schematic view of distortion of an eyepiece optical system according to a second embodiment of the invention;
FIG. 8 is a schematic view of the optical transfer function MTF of an eyepiece optical system according to a second embodiment of the invention;
fig. 9 is a schematic structural view of an eyepiece optical system according to a third embodiment of the invention;
FIG. 10 is a schematic view of a diffuse spot array of an ocular optical system of a third embodiment of the present invention;
fig. 11 is a distortion schematic diagram of an eyepiece optical system according to a third embodiment of the invention;
fig. 12 is a schematic view of the optical transfer function MTF of the eyepiece optical system according to the third embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following description will be made in detail with reference to the technical solutions in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments 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 optical axis direction from the observation side of human eyes to the micro display side, wherein the optical 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 includes at least one fresnel optical surface;
The optical focal length of the optical system is F, and the optical focal length of the first lens group is F 1, so that F and F 1 satisfy the following relation (1):
0.50≤f1/F≤1.33 (1)；
Wherein, F 1/F can take on values of 0.50, 0.53, 0.67, 0.87, 0.99, 1.21, 1.29, 0.33, etc.
The second lens group is composed of two optical lenses; wherein the second lens group comprises a third lens and a fourth lens which are adjacent to the first lens group and are sequentially arranged along the optical axis; the third lens and the fourth lens are both negative lenses;
The third lens group is composed of one piece of optical lens; wherein the third lens group includes a fifth lens adjacent to the second lens group; the fifth lens is a positive lens;
The material characteristics of the first lens and the second lens satisfy the following relational expressions (2), (3):
1.49<Nd11<1.70 (2)；
1.49<Nd12<1.70 (3)；
Wherein Nd 11、Nd12 is the refractive index of the first lens and the second lens at d-line, respectively. The d-line wavelength is 589.3nm, and the materials of the first lens and the second lens are selected from: E48R, K26R, EP3000, OKP1, etc.
And under the condition that the first lens group, the second lens group and the third lens group adopt positive, negative and positive combinations, the aberration of the system is fully corrected by adopting the negative, negative and positive combinations of the lenses in the second lens group and the third lens group, and the optical resolution of the system is improved. More importantly, the first lens group adopts a structure with double Fresnel surfaces, so that most of optical power in the optical system is shared, the difference between 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 a sufficiently negative optical power to ensure that the eyepiece optical system can achieve a sufficiently large angle of view. Meanwhile, optical indexes such as large field angle, low distortion, low chromatic aberration, low field curvature, low astigmatism and the like are realized, and an observer can observe a large-scale picture with high definition, no distortion and uniform image quality through the eyepiece optical system, so that the visual experience of high presence is achieved. The product is suitable for head-mounted displays and similar devices.
As shown in fig. 1, the lens system 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 a miniature image display; wherein, the optical surface number near the E side of the human eye is 1, and the like (from left to right, 2, 3, 4, 5 and 6), the light emitted from the miniature image display is refracted by the third lens group, the second lens group and the first lens group in sequence and then enters the human eye.
In a further embodiment, the optical focal length f 11 of the first lens and the optical focal length f 1 of the first lens group satisfy the following relation (4):
1.50≤f11/f1≤4.48 (4)。
Wherein f 11/f1 can take on values of 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, each of the first lens and the second lens includes a fresnel optical surface.
In a further embodiment, the two fresnel optical surfaces are disposed adjacent one another.
In the above embodiment, the two fresnel optical surfaces in the eyepiece optical system are disposed on the first lens and the second lens, respectively, and are disposed in an adjacent manner, that is, the optical surface of the first lens away from the human eye side is a fresnel surface, and the optical surface of the second lens close to the human eye side is a fresnel surface. The structure of double Fresnel surfaces is adopted, most of focal power in the optical system is shared, the difference between 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.
In a further embodiment, the optical focal length of the optical system is F; the optical power of the second lens group is set to f 2,F、f2 to satisfy the following relation (5):
-0.98≤f2/F≤-0.35 (5)。
wherein, F 2/F can take the values of-0.98, -0.95, -0.82, -0.77, -0.57, -0.49, -0.41, -0.38, -0.35 and the like.
In a further embodiment, the optical focal length of the first lens group is f 1, the optical power of the third lens group is f 3, and f 1、f3 satisfies the following relation (6):
0.02≤f1/f3≤2.15 (6)。
Wherein f 1/f3 can take on values of 0.02, 0.32, 0.47, 0.67, 0.89, 1.32, 1.55, 1.89, 2.01, 2.11, 2.15, etc.
The value ranges of F 1/F、f11/f1、f2/F and F 1/f3 are closely related to the correction of system aberration, the processing difficulty of the optical element and the sensitivity of the assembly deviation of the optical element, and the value of F 1/F in the relational expression (1) is larger than 0.5, so that the system aberration is sufficiently corrected, a high-quality optical effect is realized, the value of the system aberration is smaller than 1.33, and the processability of the optical element in the system is improved; the value of f 11/f1 in the relational expression (4) is larger than 1.5, so that the aberration of the system is sufficiently corrected, thereby realizing a high-quality optical effect, the value of the value is smaller than 4.48, and the processability of an optical element in the system is improved; the value of f 1/f3 in the relation (6) is more than 0.02, so that the aberration of the system is sufficiently corrected, thereby realizing a high-quality optical effect, the value of f 1/f3 is less than 2.15, and the processability of an optical element in the system is improved. The value of F 2/F in the relational expression (5) is larger than-0.95, so that the corresponding lens can provide enough negative focal power, thereby better balancing and correcting the system aberration, realizing good optical effect, reducing the correction difficulty of spherical aberration and being convenient for realizing large optical aperture.
In a further embodiment, the base surfaces of the two fresnel optical faces are planar or aspherical.
In a further embodiment, the first lens and the second lens each comprise at least one even aspherical optical surface; the optical surfaces of the third lens and the fourth lens are even aspheric surfaces.
The aberration of each stage of the optical system is further optimally corrected. Further improving the optical performance of the eyepiece optical system.
In a further embodiment, the expression for the aspheric surface is:
Where z is the sagittal height of the optical surface, c is the curvature at the apex of the aspheric surface, k is the aspheric coefficients, α2,4,6 … are the coefficients of each order, and r is the distance coordinate from the point on the surface to the optical axis of the lens system.
The optical system has the advantages that the aberration (including spherical aberration, coma, distortion, field curvature, astigmatism, chromatic aberration and other higher-order aberrations) of the optical system is sufficiently corrected, so that the eyepiece optical system is beneficial to realizing a large field angle and a large aperture, further improving the image quality of a central view field and an edge view field, reducing the difference of the image quality of the central view field and the edge view field, and realizing more uniform image quality and low distortion in a full picture.
In a further embodiment, the third lens is a biconcave lens.
In a further embodiment, the fifth lens is a biconvex lens.
In a further embodiment, the fourth lens projects away from the optical film on the human eye side towards the human eye.
The embodiment further improves the aberration such as astigmatism, field curvature and the like of the system, and is beneficial to realizing the high-resolution optical effect of uniform image quality of the whole picture by the eyepiece system.
In a further embodiment, the material of the third lens, the fourth lens and the fifth lens is optical glass or optical resin. The ocular optical system can fully correct all levels of aberration and simultaneously control the manufacturing cost of the optical element and the weight of the optical system.
The principle, scheme and display result of the eyepiece optical system are further described below through more specific embodiments.
In the following embodiments, the aperture E may be an exit pupil imaged by an eyepiece optical system, and is a virtual exit aperture, and the pupil of the human eye can observe the best imaging effect when the aperture is in the position.
First embodiment
The first embodiment eyepiece design data is shown in table one below:
List one
Fig. 1 is a 2D block diagram of an eyepiece optical system according to a first embodiment, which includes a first lens group D1, a second lens group D2, and a third lens group D3 coaxially and sequentially arranged in an optical axis direction from a human eye observation side to a display device (IMG) side, wherein the first lens group D1 is composed of a first lens L1 and a second lens L2, an optical surface 2 and an optical surface 3 of the first lens group D1 are composed of two fresnel surfaces, and the second lens group D2 is a negative power lens group composed of two negative power optical lenses, namely, a third lens L3 and a fourth lens L4; the third lens group D3 is a positive power lens group composed of one piece of positive power optical lens, that is, a fifth lens L5. Wherein the focal length F of the optical system is 20.71, the optical focal length F 1 of the first lens group D1 is 10.36, the optical power F 2 of the second lens group D2 is-20.30, the optical power F 3 of the third lens group D3 is 518.12, wherein the optical focal length F 11 of the fresnel lens close to the human eye is 46.41, i.e., F 1/F is 0.50, F 11/f1 is 4.48, F 2/F is-0.98, and F 1/f3 is 0.02.
Fig. 2, fig. 3, and fig. 4 are a speckle array diagram, a distortion diagram, and an optical transfer function MTF diagram of the optical system, respectively, which reflect that the light rays of each field of view in this embodiment have very high resolution and very small optical distortion in a unit pixel of an image plane (display device (IMG)), and the resolution of each unit period is more than 0.8 per 10mm, so that 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 II
Fig. 5 is a 2D block diagram of an eyepiece optical system according to a second embodiment, which includes a first lens group D1, a second lens group D2, and a third lens group D3 coaxially and sequentially arranged in the optical axis direction from the human eye viewing side to the display device (IMG) side, wherein the optical surfaces 2 and 3 of the first lens group are composed of two fresnel surfaces, the second lens group D2 is a negative power lens group composed of two negative power optical lenses, and the third lens group D3 is a positive power lens group composed of one positive power optical lens. Wherein the focal length F of the optical system is 22.22, the optical focal length F 1 of the first lens group D1 is 14.88, the optical power F 2 of the second lens group D2 is-12.96, the optical power F 3 of the third lens group D3 is 25.29, wherein the optical focal length F 11 of the fresnel lens near the human eye is 27.37, i.e., F 1/F is 0.67, F 11/f1 is 1.84, F 2/F is-0.583, and F 1/f3 is 0.588.
Fig. 6, fig. 7, and fig. 8 are respectively a speckle array diagram, a distortion diagram, and an optical transfer function MTF diagram of the optical system, which reflect that the light rays of each field of view in this embodiment have very high resolution and very small optical distortion in a unit pixel of an image plane (display device (I MG)), the resolution of each unit period is more than 0.8 per 10mm, 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.
Third embodiment
The third embodiment eyepiece design data is shown in table three below:
Watch III
Fig. 9 is a 2D block diagram of an eyepiece optical system according to a third embodiment, which includes a first lens group D1, a second lens group D2, and a third lens group D3 coaxially and sequentially arranged in the optical axis direction from the human eye observation side to the display device (IMG) side, wherein the optical surface 2, the optical surface 3, of the first lens group D1 are composed of two fresnel surfaces, the second lens group D2 is a negative power lens group composed of two negative power optical lenses, and the third lens group D3 is a positive power lens group composed of one piece of positive power optical lenses. Wherein the focal length F of the optical system is 17.88, the optical focal length F 1 of the first lens group D1 is 23.78, the optical power F 2 of the second lens group D2 is-6.26, the optical power F 3 of the third lens group D3 is 11.06, wherein the optical focal length F 11 of the fresnel lens near the human eye is 35.67, i.e., F 1/F is 1.33, F 11/f1 is 1.50, F 2/F is-0.35, and F 1/f3 is 2.15.
Fig. 10, 11 and 12 are respectively a speckle array diagram, a distortion diagram and an optical transfer function MTF diagram of the optical system, which reflect that the light rays of each field of view in the embodiment have high resolution and small optical distortion in a unit pixel of an image plane (display device (IMG)), the resolution of each unit period is more than 0.7 per 10mm, 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.
Each of the data of the first to third embodiments satisfies the parameter requirements recorded in the summary of the invention, and the results are shown in the following table four:
Table four
| f1/F | f11/f1 | f2/F | f1/f3 | |
| Example 1 | 0.50 | 4.48 | -0.98 | 0.02 |
| Example two | 1.33 | 1.50 | -0.35 | 2.15 |
| Example III | 0.67 | 1.89 | -0.74 | 0.55 |
The invention also provides a head-mounted display device, which comprises a micro display and an ocular; the ocular is positioned between the human eye and the micro display; the eyepiece is an eyepiece optical system of any one of the preceding claims.
Preferably, the micro display is an organic electroluminescent light emitting device, a transmissive liquid crystal display, or a reflective liquid crystal display.
Preferably, the head mounted display device comprises two identical and symmetrically arranged eyepiece optics.
In summary, the eyepiece optical system according to the above embodiments of the present invention adopts a combination of a dual fresnel optical surface type and a traditional optical spherical surface and an aspherical surface type, and combines the positive, negative, and positive lens group combinations and the focal lengths of the lenses to achieve the advantages of the indexes such as large field angle, high image quality, low distortion, small field curvature, and small volume under the condition of meeting specific matching conditions, and simultaneously greatly reduces the weight of the optical system, greatly eliminates the aberration of the system, reduces the sensitivity of each optical component, facilitates the processing and assembly of the components, and further improves the indexes such as field angle, field curvature, distortion, etc. in the optical system, thereby greatly improving the visual comfort experience of users. The observer can observe a large picture with high definition, no distortion and uniform image quality through the ocular optical system of the invention, thereby achieving the visual experience of high realistic sensation.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (9)
1. An eyepiece optical system with a large field angle, characterized in that: the optical focal length of the first lens group, the second lens group and the third lens group is positive, negative and positive combination; 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; said first lens comprising at least one of said fresnel optical faces;
the optical focal length of the optical system is set to be F, the optical focal length of the first lens group is set to be F 1, and F 1 satisfy 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 sequentially arranged along an optical axis; the third lens and the fourth lens are both negative lenses;
The third lens group is composed of one optical lens; wherein the third lens group includes a fifth lens adjacent to the second lens group; the fifth lens is a positive lens;
the material characteristics of the first and second lenses satisfy the following relational expressions (2), (3):
1.49< Nd11<1.70 （2）；
1.49< Nd12<1.70 （3）；
Wherein Nd 11、Nd12 is the refractive index of the first lens and the second lens at d-line respectively; the optical focal length f 11 of the first lens and the optical focal length f 1 of the first lens group satisfy the following relation (4):
1.50≤f11/f1≤4.48 (4)；
The optical focal length of the optical system is F; the optical power of the second lens group is set to f 2,F、f2 to satisfy the following relation (5):
-0.98 ≤ f2/F ≤ -0.35 （5）；
The optical focal length of the first lens group is f 1, and the optical power of the third lens group is f 3, f 1、f3 satisfies the following relational expression (6):
0.02 ≤ f1/f3 ≤2.15 （6）；
The third lens is a biconcave lens; the fifth lens is a biconvex lens; the optical surface of the fourth lens far away from the human eye side is convex towards the human eye direction.
2. The large field angle eyepiece optical system of claim 1 wherein each of the first lens and the second lens comprises one of the fresnel optical facets.
3. The large field angle eyepiece optical system of claim 2 wherein the two fresnel optical surfaces are disposed adjacent.
4. The large field angle eyepiece optical system of claim 2 wherein the base surfaces of the two fresnel optical surfaces are planar or aspheric.
5. The large field angle eyepiece optical system of claim 1 wherein the first lens and the second lens each comprise at least one even aspherical optical surface; the optical surfaces of the third lens and the fourth lens are even aspheric surfaces.
6. The large field angle eyepiece optical system of claim 1 wherein the materials of the third lens, the fourth lens, and the fifth lens are all optical glass or optical resin.
7. A head-mounted display device comprises a micro-display and an eyepiece; the ocular is positioned between the human eye and the micro display; characterized in that the eyepiece is an eyepiece optical system according to any one of claims 1-6.
8. The head mounted display device of claim 7, wherein the micro-display is an organic electroluminescent device, a transmissive liquid crystal display, or a reflective liquid crystal display.
9. The head mounted display device of claim 7 or 8, comprising two identical and symmetrically arranged eyepiece optics.
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| WO2022141380A1 (en) * | 2020-12-31 | 2022-07-07 | 深圳纳德光学有限公司 | Optical eyepiece system with large angle of view and head-mounted display device |
| CN114706223B (en) * | 2022-04-15 | 2023-09-19 | 青岛虚拟现实研究院有限公司 | Lens group, optical module and head-mounted display device |
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