CN112630978B - 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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- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- 210000000887 face Anatomy 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000005304 optical glass Substances 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 8
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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
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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 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 combinations; 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 includes at least one fresnel optical surface; a third lens and a fourth lens, the second lens group being arranged in order along the optical axis; the third lens and the fourth lens are both negative lenses; the third lens group includes a fifth lens, a sixth lens, and a seventh lens sequentially arranged along the optical axis; the fifth lens and the seventh lens are positive lenses; the sixth lens is a negative lens; the observer can observe the pictures with high definition, no distortion and uniform image quality of the whole picture, thereby achieving the visual experience of high presence.
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 comprising a first lens group, a second lens group and a third lens group 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; said first lens comprising at least one of said fresnel optical faces;
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 F 1, so that F 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 two optical lenses; wherein the third lens group includes a fifth lens, a sixth lens, and a seventh lens, which are sequentially arranged 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 characteristics of the first and second lenses satisfy the following relational expressions (2), (3):
1.49<Nd11<1.65 (2)；
1.49<Nd12<1.65 (3)；
Wherein Nd 11、Nd12 is the refractive index of the first lens and the second lens at d-line, respectively.
Further, the effective focal length f 11 of the first lens and the effective focal length f 1 of the first lens group satisfy the following relation (4):
1.50≤f11/f1≤4.48 (4)。
further, the effective focal length of the optical system is F; if the effective focal length of the second lens group is f 2, F, f 2 satisfies the following relation (5):
-0.98≤f2/F≤-0.35 (5)。
Further, the effective focal length of the first lens group is f 1, and the effective focal length of the third lens group is f 3, f 1、f3 satisfies the following relational expression (6):
0.02≤f1/f3≤2.15 (6)。
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 two Fresnel optical surfaces are both plane-based Fresnel optical surfaces.
Further, one or more optical surfaces of the first lens and the second lens are even-order aspheric surfaces; the optical surfaces in the third lens and the fourth lens are even aspheric surfaces.
Further, the third lens is a biconcave lens; the optical surface of the fourth lens far away from the human eye side is convex towards the human eye direction.
Further, the fifth lens is a biconvex lens; the optical surface of the sixth lens, which is close to the human eye side, is concave towards the human eye; the optical surfaces on the seventh lens are all convex towards the direction of human eyes.
Further, the materials of the third lens, the fourth lens and the sixth lens are 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 ocular; the ocular is positioned between the human eye and the miniature image display; the eyepiece is the eyepiece optical system of any one of the preceding claims.
Further, the micro 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 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 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 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 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 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 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 two optical lenses; wherein the third lens group includes a fifth lens, a sixth lens, and a seventh lens, which are sequentially arranged 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 characteristics of the first and second lenses satisfy the following relational expressions (2), (3):
1.49<Nd11<1.65 (2)；
1.49<Nd12<1.65 (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, such as: 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 second lens group and each lens in the third lens group adopt negative, positive, negative and positive combinations, thereby fully correcting the aberration of the system and improving the optical resolution of the system. More importantly, the first lens group adopts a structure with double Fresnel surfaces, so that most of effective focal lengths in the optical system are 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 effective focal length to ensure that the eyepiece optical system can achieve a sufficiently large field angle. 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 is1, and the like (2, 3,4, 5 and 6 from left to right), 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 effective focal length f 11 of the first lens and the effective 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, the effective focal length of the optical system is F; the effective focal length 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 effective focal length of the first lens group is f 1, and the effective focal length 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 effective focal length, 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, each of the first lens and the second lens includes a fresnel optical surface.
In a further embodiment, the two fresnel optical faces are disposed adjacently.
In a further embodiment, both fresnel optical faces are planar base fresnel optical faces.
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, so that most of effective focal lengths in the optical system are 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, one or more optical surfaces of the first lens and the second lens are even aspheric; the optical surfaces in 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; the optical surface of the fourth lens far away from the human eye side is convex towards 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 side is concave towards the human eye; the optical surfaces on the seventh lens are all convex towards the human eye direction.
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.
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, including 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, the first lens group being composed of a first lens L1 and a second lens L2, the first lens group D1 being two fresnel surfaces on the 2 nd and 3 rd optical surfaces, the second lens group D2 being a negative effective focal length lens group composed of two negative effective focal length optical lenses, the third lens L3 and the fourth lens L4, respectively; 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, the effective focal length F 1 of the first lens group D1 is 14.65, the effective focal length F 2 of the second lens group D2 is-10.26, the effective focal length F 3 of the third lens group D3 is 15.48, wherein the effective focal length F 11 of the fresnel lens near the human eye is 65.63, i.e., F 1/F is 0.50, F 11/f1 is 4.48, F 2/F is-0.35, and F 1/f3 is 0.95.
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 0.9 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 an optical axis direction from a human eye viewing side to a display device (IMG) side, the first lens group being composed of a first lens L1 and a second lens L2, the first lens group D1 being two fresnel surfaces on the 2 nd and 3 rd optical surfaces, the second lens group D2 being a negative effective focal length lens group composed of two negative effective focal length optical lenses, the third lens L3 and the fourth lens L4, respectively; 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, the second embodiment is mainly characterized in that various optical indexes are slightly low, and imaging quality is good. Wherein the focal length F of the optical system is 16.83, the effective focal length F 1 of the first lens group D1 is 12.87, the effective focal length F 2 of the second lens group D2 is-16.49, the effective focal length F 3 of the third lens group D3 is 643.50, wherein the effective focal length F 11 of the fresnel lens near the human eye is 19.30, i.e., F 1/F is 0.76, F 11/f1 is 1.50, F 2/F is-0.98, and F 1/f3 is 0.02.
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 (IMG)), 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 viewing side to the display device (IMG) side, the first lens group being composed of a first lens L1 and a second lens L2, the first lens group D1 being two fresnel surfaces on the 2 nd and 3 rd optical surfaces, the second lens group D2 being a negative effective focal length lens group composed of two negative effective focal length optical lenses, the third lens L3 and the fourth lens L4, respectively; 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, the second embodiment is mainly characterized in that various optical indexes are slightly low, and imaging quality is good. Wherein the focal length F of the optical system is 17.20, the effective focal length F 1 of the first lens group D1 is 22.88, the effective focal length F 2 of the second lens group D2 is-15.6, and the effective focal length F 3 of the third lens group D3 is 10.64, wherein the effective focal length F 11 of the fresnel lens near the human eye is 34.78, i.e., F 1/F is 1.33, F 11/f1 is 1.52, F 2/F is-0.91, 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 0.9 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 | -0.35 | 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 which comprises two miniature image displays respectively corresponding to the left eye position and the right eye position of a person, and comprises any item of lens optical system.
Preferably, the micro image display is an organic electroluminescent device, a transmissive liquid crystal display, or a reflective liquid crystal display.
In summary, the eyepiece optical system according to the above embodiments of the present invention utilizes the polarization of light to realize refraction and reflection of the optical path, shortens the total length of the optical system, and combines the lens group of "positive, negative and positive" combination, so that the optical system can reduce the sensitivity of each optical component, and is easy to process and assemble the components, and especially realizes the optical indexes of large field angle, low distortion, low color difference, low field curvature, low astigmatism and the like.
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 eyepiece optical system with the large field angle has three lens groups; 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 human eye observation side 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 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 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 F 1, so that F 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 three optical lenses; wherein the third lens group includes a fifth lens, a sixth lens, and a seventh lens adjacent to the second lens group and sequentially arranged along an optical axis; the fifth lens and the seventh lens are positive lenses; the sixth lens is a negative lens;
the material characteristics of the first and second lenses satisfy the following relational expressions (2), (3):
1.49<Nd11<1.65 （2）；
1.49<Nd12<1.65 （3）；
Wherein Nd 11、Nd12 is the refractive index of the first lens and the second lens at d-line respectively; the effective focal length f 11 of the first lens and the effective focal length f 1 of the first lens group satisfy the following relation (4):
1.50≤f11/f1≤4.48 (4)；
the effective focal length of the optical system is F; if the effective focal length of the second lens group is f 2, F, f satisfies the following relation (5):
-0.98 ≤ f2/F ≤ -0.35 （5）；
The effective focal length of the first lens group is f 1, and the effective focal length of the third lens group is f 3, f1 and f3 satisfy the following relation (6):
0.02 ≤ f1/f3 ≤2.15 （6）；
The third lens is a biconcave lens; the optical surface of the fourth lens far away from the human eye side protrudes towards the human eye direction;
The fifth lens is a biconvex lens; the optical surface of the sixth lens, which is close to the human eye side, is concave towards the human eye; the optical surfaces on the seventh lens are all convex towards the direction of human eyes;
Under the condition that the first lens group, the second lens group and the third lens group adopt positive, negative and positive combinations, each lens in the second lens group and the third lens group adopts negative, positive, negative and positive combinations, thereby correcting aberration of the system and improving optical resolution of the system; the first lens group adopts a structure with double Fresnel surfaces, and the effective focal length in the optical system is shared.
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 facets are disposed adjacent.
4. The large field angle eyepiece optical system of claim 2 wherein the two fresnel optical facets are both planar base fresnel optical facets.
5. The large field angle eyepiece optical system of claim 1 wherein one or more of the optical surfaces of the first lens and the second lens are even-order aspheric surfaces; the optical surfaces in the third lens and the fourth lens are even aspheric surfaces.
6. 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 an optical glass or an optical plastic.
7. A head-mounted display device comprises a miniature image display and an ocular; the ocular is positioned between the human eye and the miniature image 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 miniature image 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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| CN202011627037.9A CN112630978B (en) | 2020-12-31 | 2020-12-31 | Eyepiece optical system with large field angle and head-mounted display device |
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| WO2022141382A1 (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 |
| WO2023236176A1 (en) * | 2022-06-10 | 2023-12-14 | 深圳纳德光学有限公司 | Eyepiece optical system and head-mounted display device |
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