CN214669865U - Diopter-adjustable eyepiece optical system and head-mounted display device - Google Patents

Abstract

The utility model relates to an eyepiece optical system with adjustable diopter and a head-mounted display device, the system comprises a first lens group, a second lens group and a third lens group which are arranged in sequence along the optical axis direction from the observation side of human eyes to the miniature image display; the effective focal length of the first lens group is a positive value; the effective focal length of the second lens group is a negative value; the optical surface of the third lens group close to the miniature image display protrudes to the direction of the miniature image display; the first lens group is fixed relative to human eyes; when the focal length of the optical system is increased, the second lens group and the third lens group move towards the human eye direction along the optical axis; the user crowd who makes different diopters focuses according to specific in-service behavior fixed point through optics zoom, avoids zooming the problem that the in-process appears the image skew, presents the image of big angle of vision, high definition, distortionless and no image skew for the user, has guaranteed the uniformity of the image that different users watched, has enlarged the user crowd scope, improves and uses experience.

Description

Diopter-adjustable eyepiece optical system and head-mounted display device

Technical Field

The utility model relates to the field of optical technology, more specifically say, relate to an adjustable diopter's eyepiece optical system and wear display device.

Background

With the continuous development of electronic devices towards ultra-miniaturization and the development of new computer, micro-electronics, photoelectric devices and communication theory and technology, the novel mode based on human-oriented and man-machine-in-one of wearable computing becomes possible. The method is continuously applied to the fields of military affairs, industry, medical treatment, education, consumption and the like. In a typical wearable computing system architecture, the head mounted display device is a key component. The head-mounted display device guides video image light emitted by a miniature image display (such as a transmission type or reflection type liquid crystal display, an organic electroluminescent device and a DMD device) to pupils of a user through an optical technology, realizes virtual and enlarged images in the near-eye range of the user, and provides visual and visible images, videos and character information for the user. The eyepiece optical system is the core of the head-mounted display device and realizes the function of displaying the miniature image in front of human eyes to form a virtual amplified image.

The head-mounted display device is compact in size, light in weight, convenient to wear, capable of reducing load and the like, simultaneously capable of meeting higher requirements for larger optical view field and better optical imaging effect, thin and light, and capable of further expanding consumer groups wearing micro-display products.

Patent document 1 (chinese patent publication No. CN 107683432A), patent document 2 (chinese patent publication No. CN 107024766B), patent document 3 (chinese patent publication No. CN 105278109B), and patent document 4 (chinese patent publication No. CN 106526851A) respectively provide eyepiece optical systems that use a combination of a conventional optical spherical surface and an even aspheric surface, wherein the optical systems of patent document 1, patent document 2, patent document 3, and patent document 4 are all fixed focus optical systems, and fixed point zooming cannot be performed according to the use conditions of different users, and although the eyepiece optical system that uses a positive combination and a negative combination is used in patent document 4, the problem of image shift is easily generated during zooming, which results in the inconsistency of images viewed by different users.

Patent document 5 (chinese patent publication No. CN 108490592A) and patent document 6 (chinese patent publication No. CN 207882560U) provide eyepiece optical systems using zooming, and although high-quality imaging is ensured, the number of lenses is too large, the overall size and weight of the product are increased, and the eyepiece optical systems are not favorable for comfortable wearing experience, and the lens surface shape is complicated, and is not favorable for mass production.

Disclosure of Invention

The utility model discloses the technical problem that solve lies in that current optical system is the tight optical system, is difficult to satisfy most consumers ' demand, and optical system's weight is heavy on the left and the volume is big on the right side simultaneously, to the above-mentioned defect of prior art, provides an adjustable diopter's eyepiece optical system and wear display device.

The utility model provides a technical scheme that its technical problem adopted is: an eyepiece optical system with adjustable diopter and a head-mounted display device are constructed, and the eyepiece optical system comprises a first lens group, a second lens group and a third lens group which are sequentially arranged along the direction of an optical axis from the observation side of human eyes to the miniature image display; the effective focal length of the first lens group is set to f₁，f₁Is a positive value; an effective focal length of the second lens group is set to f₂，f₂Is a negative value; the optical surface of the third lens group close to the miniature image display protrudes to the direction of the miniature image display;

the first lens group is fixed relative to human eyes; when the focal length of the optical system is increased, the second lens group and the third lens group move towards the human eye direction along the optical axis;

an effective focal length of the third lens group is set to f₃(ii) a The effective focal length of the optical system is set to f_wThen f is₁、f₂、f₃、f_wSatisfies the following relations (1), (2), (3):

0.32≤f₁/f_w≤0.61 （1）；

-3.38≤f₂/f_w≤-0.47 （2）；

2.84≤│f₃/f_w│ （3）。

further, the first lens group has an effective focal length f₁An effective focal length of the second lens group is f₂Then f is₁And f₂Satisfies the following relation (4):

-0.18 ≤f₁/ f₂≤ -0.70 （4）。

further, a distance between an optical surface of the first lens group on the side close to the human eye and the miniature image display along the system optical axis direction is set as D_wThe effective focal length of the optical system is set to f_wThen D is_wAnd f_wSatisfies the following relation (5):

1.02≤ f_w/D_w≤ 1.54 (5)。

further, a distance between the first lens group and the second lens group in a system optical axis direction is set to D₁₂(ii) a The distance between the second lens group and the third lens group along the optical axis direction of the system is set as D₂₃(ii) a Wherein, in the 0 diopter correction state of the eyepiece optical system, the distance between the first lens group and the second lens group in the system optical axis direction is set as D₁₂₀And the distance between the second lens group and the third lens group along the optical axis direction of the system is set as D₂₃₀；

In the X diopter correction state of the eyepiece optical system, the distance between the first lens group and the second lens group along the system optical axis direction is set as D_12XAnd the distance between the second lens group and the third lens group along the optical axis direction of the system is set as D_23XThen D is₁₂₀、D₂₃₀、D_12X、D_23XSatisfies the following relation (6):

0.78≤（D_23X-D₂₃₀)/（D_12X-D₁₂₀）≤2.74 （6）。

further, the first lens group includes a first lens; the first lens is a biconvex positive lens.

Further, the first lens group comprises a first lens and a second lens, and the first lens is a double convex positive lens; the effective focal length of the first lens is set to f₁₁An effective focal length of the first lens group is f₁Then f is₁₁And f₁Satisfies the following relation (7):

0.468 ≤ f₁₁/ f₁ (7)。

furthermore, the material of the second lens is optical resin; the material property of the second lens satisfies the following relation (8):

V_d1≤31 （8）；

wherein, the above V_d1The abbe number of the second lens on the d line.

Further, the curvature radius of the optical surface of the first lens on the side close to the human eye is R₁₁₀The curvature radius of the optical surface of the first lens close to the side of the miniature image display is set as R₁₁₁And R is₁₁₀And R₁₁₁Satisfies the following relation (9):

0.1≤│R₁₁₀/R₁₁₁│≤1.83 （9）。

further, the second lens group includes a third lens; the third lens is a negative lens.

Further, the third lens group includes a fourth lens; the curvature radius of the optical surface of the fourth lens far away from the miniature image display is R₁₃₀The curvature radius of the optical surface of the fourth lens close to the side of the miniature image display is set as R₁₃₁And R is₁₃₀And R₁₃₁Satisfies the following relation (10):

0.71≤ R₁₃₀/R₁₃₁≤0.80 （10）。

further, the material characteristics of the fourth lens satisfy the following relational expressions (11), (12):

N_d3≥1.80 （11）；

V_d3≤41 （12）；

wherein, the above-mentioned N_d3The refractive index of the fourth lens on a d line; above V_d3The abbe number of the fourth lens on the d line is shown.

Further, the first lens group and the second lens group comprise one or more even aspheric surface types; the even aspheric surface type satisfies the relation (13):

（13）。

the utility model also provides a wear display device, including miniature image display and eyepiece, the eyepiece be located people's eye with between the miniature image display, the eyepiece be anyone of the aforesaid eyepiece optical system.

Further, the miniature image display is an organic electroluminescent device.

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: an optical system with adjustable diopter is provided, which adopts a combination of a positive first lens group and a negative second lens group, and a third lens group is arranged at the side of the second lens group far away from the human eye, when the focal length of the optical system is increased, the second lens group of the negative lens group and the third lens group with the effective focal length larger than the total focal length of the optical system move to the human eye side, the distance between the first lens group and the second lens group is reduced, the distance between the third lens group and a miniature image display is increased, the distance between the second lens group and the third lens group is reduced, the using crowd with different diopter can fix the focus at the fixed point according to the using condition of a specific user by optical zooming, and under the action of the third lens group, the problem of image deviation in the zooming process is avoided, and the user can present images with large field angle, high definition, no distortion and no image deviation in front of the eye, the consistency of the images watched by different users is further ensured, the range of the user groups is greatly enlarged, and the use experience is improved.

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 light path diagram of a myopia 700-degree eyepiece optical system according to a first embodiment of the present invention;

fig. 2 is a diffuse speckle array diagram of the eyepiece optical system according to the first embodiment of the present invention;

fig. 3a is a field curvature diagram of the eyepiece optical system of the first embodiment of the present invention, and fig. 3b is a distortion curve diagram of the eyepiece optical system of the first embodiment of the present invention;

fig. 4 is a graph of MTF of a myopic 700-degree eyepiece optical system of the first embodiment of the present invention;

FIG. 5 is a light path diagram of a 300-degree myopia eyepiece optical system according to a first embodiment of the present invention;

fig. 6 is a graph of MTF of a 300-degree myopic eyepiece optical system according to the first embodiment of the present invention;

fig. 7 is an optical path diagram of a 0 diopter eyepiece optical system of the first embodiment of the present invention;

fig. 8 is a graph of the MTF of the 0 diopter eyepiece optical system of the first embodiment of the present invention;

fig. 9 is an optical path diagram of a 700-degree myopia eyepiece optical system according to a second embodiment of the present invention;

fig. 10 is a diffuse speckle array diagram of an eyepiece optical system according to a second embodiment of the present invention;

fig. 11a is a field curvature diagram of an eyepiece optical system according to a second embodiment of the present invention, and fig. 11b is a distortion curve diagram of an eyepiece optical system according to a second embodiment of the present invention;

fig. 12 is a graph of MTF of a myopic 700-degree eyepiece optical system of the second embodiment of the present invention;

fig. 13 is an optical path diagram of a 300-degree myopia eyepiece optical system according to a second embodiment of the present invention;

fig. 14 is a graph of MTF of a 300-degree myopic eyepiece optical system according to a second embodiment of the present invention;

figure 15 is an optical path diagram of a 0 diopter eyepiece optical system of a second embodiment of the present invention;

figure 16 is a 0 diopter eyepiece optics MTF plot of the second embodiment of the present invention;

fig. 17 is an optical path diagram of a 700-degree myopia eyepiece optical system according to a third embodiment of the present invention;

fig. 18 is a diffuse speckle array diagram of an eyepiece optical system according to a third embodiment of the present invention;

fig. 19a is a field curvature diagram of an eyepiece optical system according to a third embodiment of the present invention, and fig. 19b is a distortion curve diagram of an eyepiece optical system according to a third embodiment of the present invention;

fig. 20 is a graph of MTF of a myopic 700-degree eyepiece optical system of the third embodiment of the present invention;

fig. 21 is an optical path diagram of a 300-degree myopia eyepiece optical system according to a third embodiment of the present invention;

fig. 22 is a graph of MTF of a 300-degree myopic eyepiece optical system according to a third embodiment of the present invention;

figure 23 is an optical path diagram of a 0 diopter eyepiece optical system of a third embodiment of the present invention;

figure 24 is a graph of the MTF of a 0 diopter eyepiece optical system of the third embodiment of the present invention;

fig. 25 is an optical path diagram of a 700-degree myopia eyepiece optical system according to a fourth embodiment of the present invention;

fig. 26 is a diffuse speckle array diagram of an eyepiece optical system according to a fourth embodiment of the present invention;

fig. 27a is a field curvature diagram of an eyepiece optical system according to a fourth embodiment of the present invention, and fig. 27b is a distortion curve diagram of an eyepiece optical system according to a fourth embodiment of the present invention;

fig. 28 is a graph of MTF of a myopic 700-degree eyepiece optical system in a fourth embodiment of the present invention;

fig. 29 is an optical path diagram of a 300-degree myopia eyepiece optical system according to a fourth embodiment of the present invention;

fig. 30 is a graph of MTF of a 300-degree myopic eyepiece optical system according to the fourth embodiment of the present invention;

figure 31 is an optical path diagram of a 0 diopter eyepiece optical system of the fourth embodiment of the present invention;

fig. 32 is a graph of the MTF of a 0 diopter eyepiece optical system of the fourth embodiment of the present invention;

fig. 33 is an optical path diagram of a 700-degree myopia eyepiece optical system according to a fifth embodiment of the present invention;

fig. 34 is a diffuse speckle array diagram of an eyepiece optical system according to a fifth embodiment of the present invention;

fig. 35a is a field curvature diagram of an eyepiece optical system according to a fifth embodiment of the present invention, and fig. 35b is a distortion curve diagram of an eyepiece optical system according to a fifth embodiment of the present invention;

fig. 36 is a graph of MTF of a myopic 700-degree eyepiece optical system of a fifth embodiment of the present invention;

fig. 37 is an optical path diagram of a 300-degree myopia eyepiece optical system according to a fifth embodiment of the present invention;

fig. 38 is a graph of MTF of a 300-degree myopic eyepiece optical system of the fifth embodiment of the present invention;

fig. 39 is an optical path diagram of a 0 diopter eyepiece optical system according to a fifth embodiment of the present invention;

fig. 40 is a graph of the MTF of the 0 diopter eyepiece optical system of the fifth 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 adjustable diopter and a head-mounted display device, which comprises a first lens group, a second lens group and a third lens group which are arranged in sequence along the optical axis direction from the observation side of human eyes to the miniature image display; the effective focal length of the first lens group is set as f₁，f₁Is a positive value; effective focal length of the second lens group is set to f₂，f₂Is a negative value; the optical surface of the third lens group close to the miniature image display protrudes to the direction of the miniature image display;

the first lens group is fixed relative to human eyes; when the focal length of the optical system is increased, the second lens group and the third lens group move towards the human eye direction along the optical axis; the distance between the first lens group and the second lens group is reduced, the distance between the third lens group and the miniature image display is increased, and the distance between the second lens group and the third lens group is reduced.

Effective focal length of the third lens group is set to f₃(ii) a Effective focal length of optical system is set to f_wThen f is₁、f₂、f3、f_wSatisfies the following relations (1), (2), (3):

0.32≤f₁/f_w≤0.61 （1）；

-3.38≤f₂/f_w≤-0.47 （2）；

2.84≤│f₃/f_w│ （3）。

wherein f is₁/f_wValues of 0.32,0.35,0.38,0.41,0.47,0.50,0.53,0.61, etc.; f. of₂/f_wCan take the values of-3.38, -3.1, -2.95, -2.13, -1.88, -1.55, -1.05, -0.51, -0.47, etc.; f₃/f_wValues of | may be 2.84, 3.3, 5.7, 7.1, 8.3, 8.7, 8.8, 9.2, etc.

In the above embodiment, by providing an optical system with adjustable diopter, a first lens group and a second lens group which are combined positively and negatively are adopted, and a third lens group is arranged on the side of the second lens group far away from the human eye, when the focal length of the optical system becomes larger, the second lens group of the negative lens group and the third lens group with effective focal length larger than the total focal length of the optical system move to the human eye side, the distance between the first lens group and the second lens group is reduced, the distance between the third lens group and the miniature image display is increased, the distance between the second lens group and the third lens group is reduced, and the user groups with different diopter are focused according to the use condition of a specific user through optical zooming.

More importantly, on the basis of the characteristics, the third lens group adjacent to the second lens group is arranged on the first lens group and the second lens group which are combined positively and negatively, namely, under the action of the third lens group, the problem of image offset in the zooming process is avoided, a user can see an image with a large field angle, high definition, no distortion and no image offset in front of the eye, the consistency of images watched by different users is further ensured, the range of the user population is greatly expanded, and the use experience is improved.

F in the above relational expressions (1), (2) and (3)₁/f_w、f₂/f_w、│f₃/f_wThe value range of | 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 relation (1)₁/f_wThe value of (2) is more than or equal to 0.32, so that the aberration of the system can be fully corrected, thereby realizing a good optical effect, and the value of less than or equal to 0.61 improves the processability of optical elements in the system; f in relation (2)₂/f_wThe value is more than-3.38, the processability of the optical element in the system is improved, and the value is less than-0.47, so that the aberration of the system is fully corrected, and a better optical effect is realized. | f in relation (3)₃/f_wThe value of | is greater than 2.84, improving the processability of the optical elements in the system.

In a further embodiment, the first lens group has an effective focal length f₁A second lens groupHas an effective focal length of f₂Then f is₁And f₂Satisfies the following relation (4):

-0.18 ≤f₁/ f₂≤ -0.70 （4）。

wherein f is₁/ f₂Can take values of-0.18, -0.25, -0.33, -0.41, -0.47, -0.55, -0.53, -0.67, -0.7, etc.

By further optimizing the value ranges of the effective focal lengths of the first lens group and the second lens group, the optical performance and the processing and manufacturing difficulty of the optical system are better balanced.

In a further embodiment, the first lens group includes a first lens and a second lens, and the first lens is a double convex positive lens; the effective focal length of the first lens is set to f₁₁The effective focal length of the first lens group is f₁Then f is₁₁And f₁Satisfies the following relation (7):

0.468 ≤ f₁₁/ f₁ (7)。

wherein f is₁₁/ f₁Values may be 0.468, 0.57, 1.75, 2.1, 3.3, 5.7, 8.8, 9.2, etc.

The value of the relation (7) is more than 0.468, so as to reduce the processing and manufacturing difficulty of the third lens and the requirement on high refractive index of the material.

In a further embodiment, a distance between an optical surface of the first lens group on the side close to the human eye and the miniature image display in the direction of the optical axis of the system is set as D_wThe effective focal length of the optical system is set to f_wThen D is_wAnd f_wSatisfies the following relation (5):

1.02≤ f_w/D_w≤ 1.54 (5)。

wherein f is_w/D_wValues may be 1.02,1.13,1.25,1.29,1.33,1.43,1.47,1.51,1.54, and so forth.

F in the above relation (5)_w/D_wThe lower limit value of (2) is more than 1.02, the correction difficulty of the off-axis aberration of the system is reduced, the central view field and the edge view field are ensured to simultaneously achieve higher image quality, and the image quality in the full picture is uniformAnd the value of the total length of the system is less than 1.54, so that the total length of the system is convenient to reduce, and the miniaturization of products is facilitated.

In a further embodiment, a distance between the first lens group and the second lens group in a system optical axis direction is set to D₁₂(ii) a The distance between the second lens group and the third lens group along the optical axis direction of the system is set as D₂₃(ii) a Wherein, in the 0 diopter correction state of the ocular optical system, the distance between the first lens group and the second lens group along the optical axis direction of the system is set as D₁₂₀The distance between the second lens group and the third lens group along the optical axis direction of the system is set as D₂₃₀；

In the X diopter correction state of the eyepiece optical system, the distance between the first lens group and the second lens group along the optical axis direction of the system is set as D_12XThe distance between the second lens group and the third lens group along the optical axis direction of the system is set as D_23XThen D is₁₂₀、D₂₃₀、D_12X、D_23XSatisfies the following relation (6):

0.78≤（D_23X-D₂₃₀)/（D_12X-D₁₂₀）≤2.74 （6）。

wherein (D)_23X-D₂₃₀)/（D_12X-D₁₂₀) Can be taken to be 0.78, 0.83,1.75,1.79,2.30,

2.45,2.60,2.74, etc.

In the above embodiment, D in the eyepiece optical system is adjusted₁₂And D₂₃To adjust the diopter of the ocular lens system, and D_wAnd keeping the same, and moving the second lens group and the third lens group along the same direction of the optical axis of the system.

In a further embodiment, the first lens group comprises a first lens; the first lens is a biconvex positive lens.

In a further embodiment, the second lens is made of optical resin; the material property of the second lens satisfies the following relation (8):

V_d1≤31 （8）；

wherein, the above V_d1Abbe number of the second lens in d-line.

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.

In a further embodiment, the radius of curvature of the optical surface of the first lens on the side close to the human eye is set to R₁₁₀The curvature radius of the optical surface of the first lens near the miniature image display is R₁₁₁And R is₁₁₀And R₁₁₁Satisfies the following relation (9):

0.1≤│R₁₁₀/R₁₁₁│≤1.83 （9）。

wherein | R₁₁₀/R₁₁₁The values of | can be 0.1, 0.15, 0.35, 0.45, 0.55, 0.72, 1.32, 1.45, 1.65, 1.83, etc.

Wherein the relationship is | < R > in (9)₁₁₀/R₁₁₁The lower limit value condition of | is greater than 0.1, makes first lens can provide sufficient positive focal power to can balance the correction system aberration better, realize good optical effect, its value is less than 1.83, has reduced the correction degree of difficulty of spherical aberration, is convenient for realize big optical aperture.

In a further embodiment, the second lens group comprises a third lens; the third lens is a negative lens.

In a further embodiment, the third lens group includes a fourth lens; the radius of curvature of the optical surface of the fourth lens away from the miniature image display is R₁₃₀The radius of curvature of the optical surface of the fourth lens near the side of the miniature image display is R₁₃₁And R is₁₃₀And R₁₃₁Satisfies the following relation (10):

0.71≤ R₁₃₀/R₁₃₁≤0.80 （10）。

wherein R is₁₃₀/R₁₃₁Values may be taken as 0.71,0.73,0.75,0.767,0.789,0.798,0.80, etc.

The second lens is ensured to have good manufacturability while the aberration of each stage of the optical system is well optimized.

In a further embodiment, the material properties of the fourth lens satisfy the following relations (11), (12):

N_d3≥1.80 （11）；

V_d3≤41 （12）；

wherein, the above-mentioned N_d3The refractive index of the fourth lens at the d line; above V_d3Abbe number of the fourth lens in d-line.

In a further embodiment, the first lens group and the second lens group include one or more even aspheric surface types; the even aspheric surface type satisfies the relation (13):

（13）。

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 is the coefficient of each order 2,4,6 …, and r is the distance coordinate from the 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.

The principle, scheme and display result of the eyepiece optical system are further described by the following more specific embodiments.

In the following embodiments, as shown in fig. 1, the liquid crystal display device includes a first lens group T1, a second lens group T2, and a third lens group T3 arranged in this order in the optical axis direction from the human eye viewing side to the miniature image display; the diaphragm EYE can be an exit pupil imaged by the ocular optical system and is a virtual light exit aperture, and when the pupil of the human EYE is at the diaphragm position, the best imaging effect can be observed. By analogy with the optical surface number of 1 on the side close to the diaphragm EYE (2, 3, 4, 5, 6, 7 and 8 from left to right), the miniature image display is IMG, and light emitted from the miniature image display sequentially passes through the third lens group T3, the second lens group T2 and the first lens group T1 and then enters human EYEs.

First embodiment

The ocular design data of the first embodiment are shown in the following tables I and II:

fig. 1 is a view of a first embodiment of a 700-degree optical structure 2D for near vision, which includes a first lens group T1 group, a second lens group T2 and a third lens group T3 arranged in this order from the EYE observation side to the miniature image display IMG along the optical axis direction, wherein the first lens group is a positive lens group, the second lens group is a negative lens group, the first lens group T1 is fixed with respect to the EYE, when the focal length of the optical system becomes larger, the second lens group T2 and the third lens group T3 group, which are negative lens groups, move toward the EYE side, as shown in fig. 1 and tables i and ii, the distance from C to B to a between the first lens group T1 and the second lens group T2 is reduced, the distance from the third lens group T3 to the miniature image display IMG is increased, and the distance between the second lens group T2 and the third lens group T3 is reduced. The first lens group T1 in the optical system is composed of a first lens T11 of a double convex positive lens and a second lens T12 of a meniscus lens; the second lens group T2 is composed of a third lens T21 which is a piece of biconcave lens, and the second lens material is OKP 1; the third lens group T3 is composed of a fourth lens T31 which is a meniscus lens. Wherein the maximum focal length of the optical system is f_w(MAX) 59.6, minimum focal Length f_w (MIN) 47.3, D_w42.87, the focal length f of the first lens group T1₁19.24, focal length f of the second lens group T2₂A focal length f of the third lens group T3 of-27.56₃Is-433.02, then f_w、f₁、f₂And f₃Relationship f₁/f_w(MAX) is 0.323, f₁/f_w(MIN) 0.407, f₂/f_w(MAX) is-0.4624, f₂/f_w(MIN) 0.58, f₃/f_w(MAX) is-7.265, f₃/f_w(MIN) 9.15, f_w/D_w(MAX) is 1.39, f_w/D_w(MIN) 1.1, f₁/ f₂Is-0.698. Distance D₁₂And said distance D₂₃Distances D in the 0 diopter correction state of the eyepiece optical system₁₂₀And D₂₃₀Distances in the X diopter correction state of the eyepiece optical system are respectively D_12XAnd D_23X，（D_23X-D₂₃₀)/（D_12X-D₁₂₀) The maximum value was 0.297 and the minimum value was 0.285. The fourth lens T31 of the third lens group T3 is distant from the radius of curvature R of the optical surface of the micro image display IMG₁₃₀A radius of curvature R of the optical surface near the IMG of the miniature image display at-14.08₁₃₁Is-19.578, R₁₃₀/R₁₃₁Is 0.72; the radius of curvature R of the optical surface of the first lens T11 of the first lens group T1 away from the miniature image display IMG is₁₁₀27.48, radius of curvature R of optical surface near to the micro image display IMG₁₁₁Is-37.63, | R₁₁₀/R₁₁₁And | is 0.73.

Fig. 2, fig. 3a, fig. 3b and fig. 4 are respectively a scattered spot array diagram, a field curvature, a distortion diagram and a transfer function MTF graph of the optical system at 700 degrees of myopia, fig. 5 and fig. 6 are an optical structure diagram and a transfer function MTF graph under 300 degrees of myopia, fig. 7 and fig. 8 are an optical structure diagram and a transfer function MTF graph under 0 diopter, which reflect that each field ray of the embodiment has very high resolution and very small optical distortion in a unit pixel of an image plane (micro image display IMG), the resolution reaches above 0.8 per 10mm of a unit period, the aberration and image drift of the optical system are well corrected, and a uniform and high-optical performance display of an image can be observed through the eyepiece optical system.

Second embodiment

The second embodiment eyepiece design data is shown in tables three and four below:

fig. 9 is a 2D image of a 700 degree optical structure for near vision of the second embodiment, which includes a first lens group T1 positive lens group, a second lens group T2 and a third lens group T3 arranged in order from the EYE side to the miniature image display IMG in the optical axis direction, wherein the first lens group T1 is a positive lens group, the second lens group T2 is a negative lens group, the first lens group T1 is fixed with respect to the EYE, when the focal length of the optical system becomes larger, the second lens group T2 and the third lens group T3 which are negative lens groups move to the EYE side, as shown in fig. 9 and table three and table four, the distance from C to B to a between the first lens group T1 and the second lens group T2 is reduced, the distance between the third lens group T3 and the miniature image display IMG is increased, and the distance between the second lens group T2 and the third lens group T3 is reduced. The first lens group T1 in the optical system is composed of a first lens T11 which is a single piece of biconvex positive lens; the second lens group T2 is composed of a second lens T21 of a meniscus negative lens, and is made of OKP4 HT; the third lens group T3 is composed of a third lens T31 of a meniscus lens. Wherein the maximum focal length of the optical system is f_w(MAX) 57.14, minimum focal length f_w (MIN) 46.7, D_w43.46, the focal length f of the first lens group T1₁23.26, focal length f of the second lens group T2₂A focal length f of the third lens group T3 of-42.95₃Is-289.52, then fw, f₁、f₂And f₃Relationship f₁/f_w(MAX) is 0.407, f₁/f_w(MIN) 0.498, f₂/f_w(MAX) is-0.752, f₂/f_w(MIN) is-0.92, f₃/f_w(MAX) is-5.067, f₃/f_w(MIN) is-6.2, f_w/D_w(MAX) is 1.31, f_w/D_w(MIN) 1.07, f₁/ f₂Is-0.542. Distance D₁₂And a distance D₂₃Distances D in the 0 diopter correction state of the eyepiece optical system₁₂₀And D₂₃₀Distances in the X diopter correction state of the eyepiece optical system are respectively D_12XAnd D_23X，（D_23X-D₂₃₀)/（D_12X-D₁₂₀) The maximum value is 0.463 and the minimum value is 0.325. The third lens T31 of the third lens group T3 is distant from the radius of curvature R of the optical surface of the micro image display IMG₁₃₀A radius of curvature R of the optical surface near the IMG of the miniature image display at-17.23₁₃₁Is-21.61, R₁₃₀/R₁₃₁Is 0.797; the radius of curvature R of the optical surface of the first lens T11 of the first lens group T1 away from the miniature image display IMG is₁₁₀42.65, radius of curvature R of optical surface near to the micro image display IMG₁₁₁Is-23.37, | R₁₁₀/R₁₁₁And | is 1.82.

Fig. 10, 11a, 11b and 12 are respectively a scattered spot array diagram, a field curvature, a distortion diagram and a transfer function MTF graph of the optical system at 700 degrees of myopia, fig. 13 and 14 are an optical structure diagram and a transfer function MTF graph under 300 degrees of myopia, fig. 15 and 16 are an optical structure diagram and a transfer function MTF graph under 0 diopter, which reflect that each field ray of the embodiment has very high resolution and very small optical distortion in a unit pixel of an image plane (micro image display IMG), the resolution reaches above 0.7 per 5mm of a unit period, the aberration and image drift of the optical system are well corrected, and a uniform and high-optical performance display of an image can be observed through the eyepiece optical system.

Third embodiment

The third embodiment eyepiece design data is shown in tables five and six below:

FIG. 17 is a 2D diagram showing an optical configuration of a zooming process according to a third embodiment, including a first lens group T1, a second lens group T2 and a third lens group T3 arranged in order from an EYE EYE side to a miniature image in an optical axis direction, wherein the first lens group T1 is a positive lens group, the second lens group T2 is a negative lens group, and the first lens group T1 is fixed with respect to the EYE EYE when the optical system is in a stationary stateWhen the focal length of (B) becomes larger, the second lens group T2 and the third lens group T3, which are negative lens groups, move to the EYE side, and as shown in fig. 17 and tables five and six, the distance from C to B to a between the first lens group T1 and the second lens group T2 decreases, the distance between the third lens group T3 and the miniature image display IMG increases, and the distance between the second lens group T2 and the third lens group T3 decreases. The first lens group T1 in the optical system is composed of a first lens T11 which is a double convex positive lens and a second lens T12 which is a meniscus negative lens; the second lens group T2 is composed of a third lens T21 which is a double concave negative lens and is made of EP 4000; the third lens group is composed of a fourth lens T31 of a meniscus lens. Wherein the maximum focal length of the optical system is f_w(MAX) 59.6, minimum focal Length f_w(MIN) 47.3, D_w42.81, the focal length f of the first lens group T1₁27.99, the focal length f of the second lens group T2₂A focal length f of the third lens group T3 of-49.24₃If it is-433, fw, f₁、f₂And f₃Relationship f₁/f_w(MAX) is 0.47, f₁/f_w(MIN) 0.59, f₂/f_w(MAX) is-0.826, f₂/f_w(MIN) is-1.04, f₃/f_w(MAX) is-7.27, f₃/f_w(MIN) 9.15, f_w/D_w(MAX) is 1.39, f_w/D_w(MIN) 1.1, f₁/ f₂Is-0.568. Distance D₁₂And a distance D₂₃Distances D in the 0 diopter correction state of the eyepiece optical system₁₂₀And D₂₃₀Distances in the X diopter correction state of the eyepiece optical system are respectively D_12XAnd D_23X，（D_23X-D₂₃₀)/（D_12X-D₁₂₀) The maximum value is 1.976 and the minimum value is 0.788. Radius of curvature R of lens T31 in the third lens group T3 away from the optical surface of the miniature image display IMG₁₃₀A radius of curvature R of the optical surface near the IMG of the miniature image display of-15.52₁₃₁Is-19.45, R₁₃₀/R₁₃₁Is 0.798; the first lens T11 in the first lens group T1 is far away from the micro lensRadius of curvature R of optical surface of IMG of mode image display₁₁₀31.75, radius of curvature R of optical surface near to the micro image display IMG₁₁₁Is-28.37, | R₁₁₀/R₁₁₁| is 1.12.

Fig. 18, 19a, 19b and 20 are respectively a diffuse speckle array diagram, a field curvature, a distortion diagram and a transfer function MTF graph of the optical system at 700 degrees of myopia, fig. 21 and 22 are an optical structure diagram and a transfer function MTF graph under 300 degrees of myopia, fig. 23 and 24 are an optical structure diagram and a transfer function MTF graph under 0 diopter, which reflect that each field ray of the embodiment has very high resolution and very small optical distortion in a unit pixel of an image plane (micro display screen IMG), the resolution reaches above 0.7 per 5mm of a unit period, the aberration and image drift of the optical system are well corrected, and a uniform and high-optical performance display image can be observed through the ocular optical system.

Fourth embodiment

The fourth embodiment eyepiece design data is shown in tables seven and eight below:

fig. 25 is a 2D diagram of an optical configuration of a zooming process according to a fourth embodiment, which includes a first lens group T1, a second lens group T2, and a third lens group T3 arranged in this order from the EYE side to the miniature image display IMG in the optical axis direction, wherein the first lens group T1 is a positive lens group, the second lens group T2 is a negative lens group, the first lens group T1 is fixed with respect to the EYE, and when the focal length of the optical system becomes larger, the second lens group T2 and the third lens group T3, which are negative lens groups, move to the EYE side, as shown in fig. 25, table seven, and table eight, the distance from C to B to a between the first lens group T1 and the second lens group T2 is reduced, the distance between the third lens group T3 and the miniature image display IMG is increased, and the distance between the second lens group T2 and the third lens group T3 is reduced. The first lens group T1 in the optical system is composed of a first lens T11 of a double convex positive lens and a meniscus negative lensA second lens T12 of the mirror; the second lens group T2 is composed of a third lens T21 of a negative meniscus lens, and is made of EP 4000; the third lens group T3 is composed of a fourth lens T31 which is a meniscus lens. Wherein the maximum focal length of the optical system is f_w (MAX) 52.46 for minimum focal length f_w(MIN) 45.47, D_w44.79, the focal length f of the first lens group T1₁27.77, the focal length f of the first lens T11₁₁13.02, the focal length f of the second lens group T2₂A focal length f of the third lens group T3 of-153.65₃Is-209.4, then f_w、f₁、f₂And f₃Relationship f₁/f_w(MAX) is 0.61, f₁/f_w(MIN) 0.53, f₂/f_w(MAX) is-3.38, f₂/f_w(MIN) is-2.93, f₃/f_w(MAX) is-4.6, f₃/f_w(MIN) is-3.99, f_w/D_w(MAX) is 1.02, f_w/D_w(MIN) 1.17, f₁/ f₂Is-0.18, f₁₁/ f₁Is 0.47. Distance D₁₂And said distance D₂₃Distances in the 0 diopter correction state of the eyepiece optical system are D₁₂₀And D₂₃₀Distances in the X diopter correction state of the eyepiece optical system are respectively D_12XAnd D_23X，（D_23X-D₂₃₀)/（D_12X-D₁₂₀) The maximum value was 2.74 and the minimum value was 0.95. Radius of curvature R of lens T31 of the third lens group T3 away from the optical surface of the miniature image display IMG₁₃₀A radius of curvature R of the optical surface near the IMG of the miniature image display of-12.68₁₃₁Is-16.96, R_130/R₁₃₁Is 0.75; radius of curvature R of lens T11 of the first lens group T1 lens group away from the optical surface of the miniature image display IMG₁₁₀28.1, radius of curvature R of optical surface near to the micro image display IMG₁₁₁Is-11.95, | R₁₁₀/R₁₁₁| is 2.35.

Fig. 26, 27a, 27b and 28 are respectively a diffuse speckle array diagram, a field curvature, a distortion diagram and a transfer function MTF graph of the optical system at 700 degrees of myopia, fig. 29 and 30 are an optical structure diagram and a transfer function MTF graph under 300 degrees of myopia, fig. 31 and 32 are an optical structure diagram and a transfer function MTF graph under 0 diopter, which reflect that each field ray of the embodiment has very high resolution and very small optical distortion in a unit pixel of an image plane (micro image display IMG), the resolution reaches above 0.7 per 5mm of a unit period, the aberration and image drift of the optical system are well corrected, and a uniform and high-optical performance display image can be observed through the eyepiece optical system.

Fifth embodiment

The fifth embodiment eyepiece design data is shown in tables nine and ten below:

fig. 33 is a 2D diagram of an optical configuration of a zooming process according to a fifth embodiment, which includes a first lens group T1, a second lens group T2, and a third lens group T3 arranged in order from the EYE side to the miniature image display IMG in the optical axis direction, wherein the first lens group T1 is a positive lens group, the second lens group T2 is a negative lens group, the first lens group T1 is fixed with respect to the EYE, the second lens group T2 and the third lens group T3, which are negative lens groups, move toward the EYE side as the focal length of the optical system becomes larger, as shown in fig. 33 and tables nine and ten, the distance from C to B to a between the first lens group T1 and the second lens group T2 is smaller, the distance between the third lens group T3 and the miniature image display IMG is larger, and the distance between the second lens group T2 and the third lens group T3 is smaller. The first lens group T1 in the optical system is composed of a first lens T11 which is a double convex positive lens and a second lens T12 which is a meniscus negative lens; the second lens group T2 is composed of a third lens T21 which is a double concave negative lens and is made of EP 4000; the third lens group T3 is composed of a fourth lens T31 which is a meniscus lens. Wherein the maximum focal length of the optical system is f_w (MAX) is 83.13 and the minimum focal length is f_w (MIN) 59.55, D_wIs 54.13, focal length f of the first lens group T1₁29.6, focal length f of the first lens T11₁₁59.01, the focal length f of the second lens group T2₂A focal length f of the third lens group T3 of-43.43₃Is-236.12, then fw, f₁、f₂And f₃Relationship f₁/f_w(MAX) is 0.36, f₁/f_w(MIN) 0.50, f₂/f_w(MAX) is-0.522, f₂/f_w(MIN) is-0.73, f₃/f_w(MAX) is-2.84, f₃/f_w(MIN) is-3.96, f₁/ f₂Is-0.68, f_w/D_w(MAX) is 1.54, f_w/D_w(MIN) 1.1, f₁/ f₂Is-0.68, f₁₁/ f₁Is 1.99. Distance D₁₂And said distance D₂₃Distances D in the 0 diopter correction state of the eyepiece optical system₁₂₀And D₂₃₀Distances in the X diopter correction state of the eyepiece optical system are respectively D_12XAnd D_23X，（D_23X-D₂₃₀)/（D_12X-D₁₂₀) The maximum value is 1.22 and the minimum value is 1. A fourth lens T31 of the third lens group T3 is distant from a radius of curvature R of an optical surface of the micro image display IMG₁₃₀A radius of curvature R of the optical surface near the IMG of the miniature image display of-13.68₁₃₁Is-19.07, R_130/R₁₃₁Is 0.72; a radius of curvature R of a first lens T11 of the first lens group T1 lens group away from an optical surface of the miniature image display IMG₁₁₀39.18, radius of curvature R of optical surface near to the micro image display IMG₁₁₁Is-371.3, | R₁₁₀/R₁₁₁| is 0.10.

Fig. 34, 35a, 35b and 36 are respectively a diffuse speckle array diagram, a field curvature, a distortion diagram and a transfer function MTF graph of the optical system at 700 degrees of myopia, fig. 37 and 38 are respectively an optical structure diagram and a transfer function MTF graph under 300 degrees of myopia, fig. 39 and 40 are respectively an optical structure diagram and a transfer function MTF graph under 0 diopter, which reflect that each field ray of the embodiment has very high resolution and very small optical distortion in a unit pixel of an image plane (micro display screen IMG), the resolution reaches above 0.8 per 5mm of a unit period, the aberration and image drift of the optical system are well corrected, and a uniform and high-optical performance display image can be observed through the eyepiece optical system.

Each item of data of the above embodiments one to five all satisfies the parameter requirements recorded in the contents of the utility model, and the results are shown in the following table eleven:

the utility model also provides a wear display device, including miniature image display and eyepiece, the eyepiece is located people's eye and miniature image display between, and the eyepiece is the eyepiece optical system of any one of the aforesaid.

Preferably, the miniature image display is an organic electroluminescent device.

Preferably, the head mounted display device includes two identical and symmetrically arranged eyepiece optical systems.

In the specific implementation and application process, the display content on the miniature image display is respectively watched by the left eye and the right eye of an observer through the eyepiece optical system to form clear enlarged visual experience, the observer can adjust the second lens group and the third lens group, the second lens group and the third lens group move to the human eye side, the distance between the first lens group and the second lens group is reduced, the distance between the third lens group and the miniature image display is increased, the distance between the second lens group and the third lens group is reduced, and the user groups with different diopters can fix the fixed point and focus according to the use condition of a specific user through optical zooming. And under the action of the third lens group, the problem of image deviation in the zooming process is avoided, and a user can view pictures consistent with other people.

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 (15)

1. An eyepiece optical system capable of diopter adjustment, characterized in that: comprises a first lens group, a second lens group and a third lens group which are sequentially arranged along the direction of an optical axis from the observation side of human eyes to the miniature image display; the effective focal length of the first lens group is set to f₁，f₁Is a positive value; an effective focal length of the second lens group is set to f₂，f₂Is a negative value; the optical surface of the third lens group close to the miniature image display protrudes to the direction of the miniature image display;

the first lens group is fixed relative to human eyes; when the focal length of the optical system is increased, the second lens group and the third lens group move towards the human eye direction along the optical axis;

an effective focal length of the third lens group is set to f₃(ii) a The effective focal length of the optical system is set to f_wThen f is₁、f₂、f₃、f_wSatisfies the following relations (1), (2), (3):

0.32≤f₁/f_w≤0.61 （1）；

-3.38≤f₂/f_w≤-0.47 （2）；

2.84≤│f₃/f_w│ （3）。

2. diopter adjustable eyepiece optical system of claim 1, wherein said first lens group has an effective focal length f₁An effective focal length of the second lens group is f₂Then f is₁And f₂Satisfies the following relation (4):

-0.18 ≤f₁/ f₂≤ -0.70 （4）。

3. diopter adjustable eyepiece optical system according to claim 1, wherein a distance in a system optical axis direction between an optical surface on a human eye side in the first lens group and the miniature image display deviceIs set to D_wThe effective focal length of the optical system is set to f_wThen D is_wAnd f_wSatisfies the following relation (5):

1.02≤ f_w/D_w≤ 1.54 (5)。

4. an diopter adjustable eyepiece optical system according to claim 1, wherein a distance between said first lens group and said second lens group in a system optical axis direction is set to D₁₂(ii) a The distance between the second lens group and the third lens group along the optical axis direction of the system is set as D₂₃(ii) a Wherein, in the 0 diopter correction state of the eyepiece optical system, the distance between the first lens group and the second lens group in the system optical axis direction is set as D₁₂₀And the distance between the second lens group and the third lens group along the optical axis direction of the system is set as D₂₃₀；

In the X diopter correction state of the eyepiece optical system, the distance between the first lens group and the second lens group along the system optical axis direction is set as D_12XAnd the distance between the second lens group and the third lens group along the optical axis direction of the system is set as D_23XThen D is₁₂₀、D₂₃₀、D_12X、D_23XSatisfies the following relation (6):

0.78≤（D_23X-D₂₃₀)/（D_12X-D₁₂₀）≤2.74 （6）。

5. a diopter adjustable eyepiece optical system according to claim 1, wherein said first lens group comprises a first lens; the first lens is a biconvex positive lens.

6. A diopter adjustable eyepiece optical system according to claim 1, wherein said first lens group includes a first lens and a second lens, and said first lens is a double convex positive lens; the effective focal length of the first lens is set to f₁₁An effective focal length of the first lens group is f₁Then f is₁₁And f₁Satisfies the following relation (7):

0.468 ≤ f₁₁/ f₁ (7)。

7. an eyepiece optical system with adjustable diopter according to claim 5, wherein the material of said second lens is optical resin; the material property of the second lens satisfies the following relation (8):

V_d1≤31 （8）；

wherein, the above V_d1The abbe number of the second lens on the d line.

8. An diopter adjustable eyepiece optical system according to claim 5 or 6, wherein a radius of curvature of an optical surface of said first lens on a side close to the human eye is set to R₁₁₀The curvature radius of the optical surface of the first lens close to the side of the miniature image display is set as R₁₁₁And R is₁₁₀And R₁₁₁Satisfies the following relation (9):

0.1≤│R₁₁₀/R₁₁₁│≤1.83 （9）。

9. a diopter adjustable eyepiece optical system according to claim 1, wherein said second lens group includes a third lens; the third lens is a negative lens.

10. A diopter adjustable eyepiece optical system according to claim 1, wherein said third lens group includes a fourth lens; the curvature radius of the optical surface of the fourth lens far away from the miniature image display is R₁₃₀The curvature radius of the optical surface of the fourth lens close to the side of the miniature image display is set as R₁₃₁And R is₁₃₀And R₁₃₁Satisfies the following relation (10):

0.71≤ R₁₃₀/R₁₃₁≤0.80 （10）。

11. diopter adjustable eyepiece optical system according to claim 10, wherein the material properties of the fourth lens satisfy the following relations (11), (12):

N_d3≥1.80 （11）；

V_d3≤41 （12）；

wherein, the above-mentioned N_d3The refractive index of the fourth lens on a d line; above V_d3The abbe number of the fourth lens on the d line is shown.

12. A diopter adjustable eyepiece optical system according to claim 1, wherein said first lens group and said second lens group include one or more even-order aspherical surface types therein; the even aspheric surface type satisfies the relation (13):

（13）。

13. a head-mounted display device comprising a miniature image display and an eyepiece, said eyepiece being positioned between a human eye and said miniature image display, characterized by: the eyepiece is the eyepiece optical system of any one of claims 1 to 12.

14. The head-mounted display apparatus of claim 13, wherein the miniature image display is an organic electroluminescent device.

15. The head mounted display device of claim 13, wherein the head mounted display device comprises two identical and symmetrically arranged eyepiece optical systems.

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