CN213934401U - 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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Abstract
The utility model relates to an eyepiece optical system with a large field angle and a head-mounted display device, the system 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 side of a miniature image display, and 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 comprises 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 second lens group comprises third lenses which are adjacent to the first lens group and are sequentially arranged along the optical axis; the third lens is a negative lens; the third lens group comprises a fourth lens and a fifth lens which are adjacent to the second lens group and are sequentially arranged along the optical axis; the fourth lens is a positive lens; the fifth lens is a negative lens; the system can realize the indexes of large field angle, high image quality, low distortion, small curvature of field, small volume and the like.
Description
Technical Field
The utility model relates to the field of optical technology, more specifically say, relate to an eyepiece optical system and head mounted display device of big angle of vision.
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.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, adopt novel optics face type fresnel surface, carry out creative reasonable collocation with traditional sphere, aspheric surface face type, construct eyepiece optical system and the head-mounted display device of a big angle of vision, realize indexes such as big angle of vision, high image resolution, low distortion, little curvature of field, little volume.
The utility model provides a technical scheme that its technical problem adopted is: 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 third lenses adjacent to the first lens group and sequentially arranged along an optical axis; the third lens is a negative lens;
the third lens group is composed of two optical lenses; wherein the third lens group includes a fourth lens and a fifth lens which are arranged in order along an optical axis adjacent to the second lens group; the fourth lens is a positive lens; the fifth 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 basal surfaces of the two Fresnel optical surfaces are plane or aspheric surfaces.
Further, the third lens and the fifth lens are both biconcave lenses; the fourth lens is a biconvex lens.
Further, the expression of the aspherical surface is:
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 are all even-order aspheric surfaces.
Further, the material of the third lens and the fifth lens is optical glass or optical plastic.
The utility model also provides a head-mounted display device, which comprises a miniature image display and an ocular lens; 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 an organic electroluminescent device, 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 beneficial effects of the utility model reside in 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. The observer can pass through the utility model discloses an eyepiece optical system watches full picture high definition, undistorted, the even picture by a wide margin of quality of image, reaches the visual experience of high telepresence.
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 below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:
fig. 1 is a schematic structural view of an eyepiece optical system according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a diffuse spot array of an eyepiece optical system according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of distortion of an eyepiece optical system of a first embodiment of the present invention;
fig. 4 is a schematic diagram of an optical transfer function MTF of an eyepiece optical system according to a first embodiment of the present invention;
fig. 5 is a schematic structural view of an eyepiece optical system according to a second embodiment of the present invention;
fig. 6 is a schematic diagram of a diffuse spot array of an eyepiece optical system according to a second embodiment of the present invention;
fig. 7 is a schematic diagram of distortion of an eyepiece optical system of a second embodiment of the present invention;
fig. 8 is a schematic diagram of an optical transfer function MTF of an eyepiece optical system according to a second embodiment of the present invention;
fig. 9 is a schematic structural view of an eyepiece optical system according to a third embodiment of the present invention;
fig. 10 is a schematic view of a diffuse spot array of an eyepiece optical system according to 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 diagram of an optical transfer function MTF of an eyepiece optical system according to 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, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The utility model 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 human eyes to the side of a miniature image display, and 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 F, and the effective focal length of the first lens group is set to F1Then F and F1Satisfies the following relation (1):
0.50≤f1/F≤1.33 (1)；
wherein f is1The value of/F can be 0.5, 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; the second lens group comprises third lenses which are adjacent to the first lens group and are sequentially arranged along the optical axis; the third lens is a negative lens;
the third lens group is composed of two optical lenses; the third lens group comprises a fourth lens and a fifth lens which are adjacent to the second lens group and are sequentially arranged along the optical axis; the fourth lens is a positive lens; the fifth 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 and negative 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 (from left to right, 2, 3, 4, 5, 6. cndot. cndot.), 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 the further implementationIn an embodiment, the 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)。
wherein f is11/f1Values may be 1.5, 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 f2Then 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/f3Is greater than 0.02, so that the system aberration is reducedAre sufficiently calibrated to achieve a good optical effect, with values less than 2.15, improving the processability of the optical elements in the system. F in relation (5)2The 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, the base surfaces of the two fresnel optical surfaces are planar or aspherical.
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, the third lens and the fifth lens are both biconcave lenses; the fourth lens is a biconvex lens.
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 are all even-order 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 material of the third lens and the fifth lens is optical glass or optical plastic. The method can fully correct all levels of aberration of the eyepiece optical system, 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 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 the 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 D1 including a first lens L1 and a second lens L2; optical surface 2 and light in first lens L1 and second lens L2The optical surfaces 3 are all fresnel surfaces which are arranged adjacently, and the second lens group D2 is a negative effective focal length lens group consisting of a negative effective focal length optical lens and respectively comprises a third lens L3; the third lens group D3 is a positive effective focal length lens group composed of a positive effective focal length optical lens and a negative effective focal length optical lens, and includes a fourth lens L4 and a fifth lens L5, respectively. Wherein the focal length F of the optical system is 26.48, and the effective focal length F of the first lens group D1113.24, the effective focal length f of the second lens group D22An effective focal length f of the third lens group D3 of-9.273591.36, where the effective focal length f of the Fresnel lens is closer to the human eye11Is 59.32, i.e. f1Has a/F of 0.50, F11/f1Is 4.48, f2A ratio of/F of-0.35, F1/f3Is 0.02.
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, the first lens group D1 comprisingA first lens L1 and a second lens L2; the optical surfaces 2 and 3 of the first lens L1 and the second lens L2 are all fresnel surfaces arranged adjacently, and the second lens group D2 is a negative effective focal length lens group composed of a negative effective focal length optical lens, and includes a third lens L3; the third lens group D3 is a positive effective focal length lens group composed of a positive effective focal length optical lens and a negative effective focal length optical lens, and includes a fourth lens L4 and a fifth lens L5, 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 15.15, and the effective focal length F of the first lens group D1120.15, the effective focal length f of the second lens group D22An effective focal length f of the third lens group D3 of-10.3839.37, wherein the effective focal length f of the Fresnel lens is that close to the human eye11Is 30.64, i.e. f1A ratio of/F of 1.33, F11/f1Is 1.52, f2The ratio of/F is-0.69, F1/f3Is 2.15.
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 0.6, 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 shows a third embodimentA 2D configuration diagram of an eyepiece optical system including a first lens group D1, a second lens group D2, and a third lens group D3 coaxially arranged in this order in an optical axis direction from a human eye viewing side to a display device (IMG) side, the first lens group D1 including a first lens L1 and a second lens L2; the optical surfaces 2 and 3 of the first lens L1 and the second lens L2 are all fresnel surfaces arranged adjacently, and the second lens group D2 is a negative effective focal length lens group composed of a negative effective focal length optical lens, and includes a third lens L3; the third lens group D3 is a positive effective focal length lens group composed of a positive effective focal length optical lens and a negative effective focal length optical lens, and includes a fourth lens L4 and a fifth lens L5, respectively. Compared with the first embodiment and the third embodiment, the optical imaging device has the main characteristics of higher optical indexes and good imaging quality. Wherein the focal length F of the optical system is 14.27, and the effective focal length F of the first lens group D1113.73, the effective focal length f of the second lens group D22An effective focal length f of the third lens group D3 of-13.983Is 11.73, wherein the effective focal length f of the Fresnel lens is closer to the human eye11Is 20.63, i.e. f1a/F of 0.96, F11/f1Is 1.50, f2A ratio of/F of-0.98, F1/f3Is 1.17.
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 0.8, 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 item of data in the above embodiments one to three satisfies the parameter requirements recorded in the contents of the utility model, 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 | 0.02 |
| Example two | 1.33 | 1.52 | -0.69 | 2.15 |
| EXAMPLE III | 0.96 | 1.50 | -0.98 | 1.17 |
The utility model also provides a head-mounted display device, which comprises a micro display and an ocular lens; the eyepiece is positioned between the human eyes and the micro display; the eyepiece is the eyepiece optical system of any one of the preceding.
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 includes two identical and symmetrically arranged eyepiece optical systems.
To sum up, the utility model discloses an eyepiece optical system of above-mentioned each embodiment has adopted the combination of a two fresnel optical surface types and traditional optics sphere and aspheric surface type, combine just, burden, the focus of positive lens group combination and each lens realizes the big angle of vision that it had under the circumstances that satisfies specific collocation condition, high image quality, low distortion, little curvature of field, when index advantages such as little volume, also very big reduction optical system's weight, system's aberration is eliminated by a wide margin, reduce the sensitivity of each optical component, easily processing and the equipment of part, further angle of vision in the optical system, curvature of field, index such as distortion, the comfortable experience of user's vision of very big improvement. The observer can pass through the utility model discloses an eyepiece optical system watches full picture high definition, undistorted, the even picture by a wide margin of quality of image, reaches the visual experience of high telepresence.
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 considered to be within the scope of the invention as defined by the following claims.
Claims (13)
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 third lenses adjacent to the first lens group and sequentially arranged along an optical axis; the third lens is a negative lens;
the third lens group is composed of two optical lenses; wherein the third lens group includes a fourth lens and a fifth lens adjacent to the second lens group and arranged in order along an optical axis; the fourth lens is a positive lens; the fifth 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. The large-field-angle eyepiece optical system of claim 5, wherein the base surfaces of the two Fresnel optical surfaces are planar or aspheric.
8. The large-field-angle eyepiece optical system according to claim 1, wherein each of the third lens and the fifth lens is a biconcave lens; the fourth lens is a biconvex lens.
9. 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 are all even-order aspheric surfaces.
10. The large-field-angle eyepiece optical system of claim 1, wherein the material of the third lens and the fifth lens is optical glass or optical plastic.
11. 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 1-10.
12. The head-mounted display device of claim 11, wherein the miniature image display is an organic electroluminescent device, a transmissive liquid crystal display, or a reflective liquid crystal display.
13. The head mounted display device of claim 11 or 12, wherein the head mounted display device comprises two identical and symmetrically arranged eyepiece optical systems.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460747A (en) * | 2021-11-30 | 2022-05-10 | 歌尔光学科技有限公司 | Optical system and head-mounted display device |
| WO2022141386A1 (en) * | 2020-12-31 | 2022-07-07 | 深圳纳德光学有限公司 | Eyepiece optical system having large field of view and head-mounted display device |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022141386A1 (en) * | 2020-12-31 | 2022-07-07 | 深圳纳德光学有限公司 | Eyepiece optical system having large field of view and head-mounted display device |
| CN114460747A (en) * | 2021-11-30 | 2022-05-10 | 歌尔光学科技有限公司 | Optical system and head-mounted display device |
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