CN210835439U - An eyepiece optical system and equipment with a large field of view and high image quality - Google Patents

Abstract

The utility model relates to an eyepiece optical system and equipment with a large viewing angle and high image quality, comprising a first lens group and a second lens group arranged in sequence along the optical axis direction from the observation side of the human eye to the microdisplay; The lens group consists of one or more lenses, and the second lens group includes a Fresnel lens; the Fresnel lens includes a Fresnel surface; by using a new optical surface type Fresnel surface type and traditional optical spherical and aspherical surfaces When the focal length of each lens and lens group meets specific conditions, the system aberration can be greatly eliminated, the sensitivity of each optical component is reduced, the processing and assembly of components are easy, and especially a large field of view is achieved at the same time. Angle, low distortion, low chromatic aberration, low field curvature, low astigmatism and other optical indicators, the observer can watch the full-frame high-definition, distortion-free, uniform image quality through the eyepiece optical system of the utility model, and achieve a high sense of presence. visual experience.

Description

An eyepiece optical system and equipment with a large field of view and high image quality

technical field

The utility model relates to an optical system of a head-mounted display device, in particular to an eyepiece optical system and device with a large viewing angle and high image quality.

Background technique

With the continuous development of electronic devices towards ultra-miniaturization, as well as the development of new computer, microelectronics, optoelectronic devices and communication theories and technologies, wearable computing, a new model based on "people-oriented" and "human-machine integration" has become possible. . Applications continue to emerge in military, industrial, medical, education, consumer and other fields. In a typical wearable computing system architecture, the head-mounted display device is a key component. The head-mounted display device guides the video image light emitted by the miniature image display (such as transmissive or reflective liquid crystal display, organic electroluminescent device, DMD device) to the user's pupil through optical technology, and the user's near vision The scope realizes virtual and enlarged images, and provides users with intuitive and visible images, videos, and text information. The eyepiece optical system is the core of the head-mounted display device, which realizes the function of displaying a miniature image in front of the human eyes to form a virtual magnified image.

The head-mounted display device is developing towards the direction of compact size, light weight, easy to wear on the head and lightening of the load. At the same time, large field of view and visual comfort have gradually become the key factors to measure the quality of head-mounted display devices. Large field of view determines the effect of high-presence visual experience, and high image quality and low distortion determine the comfort of visual experience. Spend. To meet these requirements, it is necessary for the eyepiece optical system to achieve a large field of view, high image resolution, low distortion, small field curvature, and small volume as much as possible. At the same time, satisfying the above optical performance is very important for system design and aberration optimization. challenge.

Utility model content

The technical problem to be solved by the present invention is that the existing optical structure has low image quality, distortion and insufficient field of view. Aiming at the above-mentioned defects of the prior art, an eyepiece optical structure, system and equipment are provided.

The technical scheme adopted by the utility model to solve the technical problem is as follows: the novel Fresnel surface shape and the traditional spherical surface and aspheric surface shape are used for creative and reasonable matching to construct a high image quality, large field of view, easy to use Machined eyepiece optics.

An eyepiece optical system with a large field of view and high image quality is constructed, which includes a first lens group and a second lens group sequentially arranged along the optical axis from the observation side of the human eye to the microdisplay; the first lens group is composed of consisting of one or more lenses, the second lens group includes a Fresnel lens; the Fresnel lens includes a Fresnel surface;

The Fresnel surface can be divided into N segments from the center to the edge, wherein the frequency in the nth segment is fn, and N and n satisfy the following relational expressions (1) and (2):

N≥1 (1);

1≤n≤N (2);

The focal length of the Fresnel lens is F4, the total focal length of the optical system is F, and F4 and F satisfy the following relational formula (3):

0.3≤|F4/F| (3).

As a further scheme of the present utility model: the clear aperture of the Fresnel lens is D4, and D4 and F4 satisfy the following relational formula (4):

|D4/F4|≤2.5 (4).

As a further scheme of the present utility model: the distance from the optical surface of the Fresnel lens close to the side of the micro-display device to the micro-display device is fd, and fd and F satisfy the following relational formula (5):

0.05≤fd/F≤1.0 (5).

As a further scheme of the present utility model: described F4 and F further satisfy the following relational formula (6):

0.3455≤|F4/F| (6).

As a further scheme of the present utility model: the D4 and F4 further satisfy the following relational formula (7):

|D4/F4|≤2.05 (7).

As a further scheme of the present utility model: the fd and F further satisfy the following relational formula (8):

0.095≤fd/F≤0.89 (8).

As a further solution of the present invention, each lens of the first lens group and the second lens group is made of glass material or plastic material.

As a further solution of the present invention, the Fresnel lens further includes a common optical surface; the common optical surface is a plane, spherical or aspherical surface.

As a further solution of the present invention: the surface type of each lens in the first lens group is a spherical surface type, an even-order aspherical surface type or a Fresnel surface type, and the first lens group and the first lens group are There is at least one axisymmetric aspheric lens in the two lens groups.

The utility model also provides an eyepiece optical device with a large field of view and high image quality, which includes two micro display devices corresponding to the positions of the left and right eyes of a human, and also includes the optical system according to any one of the foregoing, wherein the The optical system is arranged between the human eye and the micro display device, and projects the picture displayed by the micro display device to the human eye with the characteristics of high image quality, low distortion and large viewing angle.

The beneficial effects of the present utility model are: the utility model adopts the combination of the novel Fresnel surface type and the traditional optical spherical surface and aspherical surface type, and the focal length of each lens and lens group is realized under the condition that specific conditions are met. The system aberration is largely eliminated, the sensitivity of each optical component is reduced, the processing and assembly of the components are easy, especially the optical indicators such as large field of view, low distortion, low chromatic aberration, low field curvature, and low astigmatism are realized. Through the eyepiece optical system of the present invention, a large picture with full-frame high-definition, no distortion and uniform image quality can be viewed, thereby achieving a high-presence visual experience.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the present utility model will be further described below with reference to the accompanying drawings and embodiments. The accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings:

Fig. 1 is the surface profile schematic diagram of the Fresnel surface of the present utility model;

Fig. 2 is the sectional enlarged view of A-A place in Fig. 1 of the utility model;

3 is a schematic structural diagram of the eyepiece optical system according to Embodiment 1 of the present invention;

4 is a schematic diagram of a diffused spot array of the eyepiece optical system according to Embodiment 1 of the present invention;

5 is a schematic diagram of the distortion of the eyepiece optical system according to the first embodiment of the present invention;

6 is a schematic diagram of the optical transfer function MTF of the eyepiece optical system according to the first embodiment of the present invention;

7 is a schematic structural diagram of an eyepiece optical system according to Embodiment 2 of the present invention;

8 is a schematic diagram of a diffused spot array of the eyepiece optical system according to Embodiment 2 of the present invention;

9 is a schematic diagram of the distortion of the eyepiece optical system according to the second embodiment of the present invention;

10 is a schematic diagram of the optical transfer function MTF of the eyepiece optical system according to the second embodiment of the present invention;

11 is a schematic structural diagram of an eyepiece optical system according to Embodiment 3 of the present invention;

12 is a schematic diagram of a diffused speckle array of the eyepiece optical system according to Embodiment 3 of the present invention;

13 is a schematic diagram of the distortion of the eyepiece optical system according to the third embodiment of the present invention;

14 is a schematic diagram of the optical transfer function MTF of the eyepiece optical system according to the third embodiment of the present invention;

15 is a schematic structural diagram of the eyepiece optical system according to the fourth embodiment of the present invention;

16 is a schematic diagram of a diffused speckle array of the eyepiece optical system according to the fourth embodiment of the present invention;

17 is a schematic diagram of the distortion of the eyepiece optical system according to the fourth embodiment of the present invention;

18 is a schematic diagram of the optical transfer function MTF of the eyepiece optical system according to the fourth embodiment of the present invention;

19 is a schematic structural diagram of an eyepiece optical system according to Embodiment 5 of the present invention;

20 is a schematic diagram of a diffused spot array of the eyepiece optical system according to the fifth embodiment of the present invention;

21 is a schematic diagram of the distortion of the eyepiece optical system according to the fifth embodiment of the present invention;

22 is a schematic diagram of the optical transfer function MTF of the eyepiece optical system according to the fifth embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the following will describe clearly and completely the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are part of the implementation of the present utility model. examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

An eyepiece optical system with a large field of view and high image quality of the present invention is shown in Figures 1 and 2, providing an eyepiece optical system with a large field of view and high image quality, including the observation side from the human eye to the microdisplay The first lens group A1 and the second lens group A2 are arranged in sequence along the optical axis direction; the first lens group A1 is composed of one or more lenses, and the second lens group A2 includes a Fresnel lens; the Fresnel lens includes Fresnel surface;

The Fresnel surface can be divided into N segments from the center to the edge, where the frequency in the nth segment is fn, and N and n satisfy the following relations (1), (2):

N≥1 (1);

1≤n≤N (2);

In the above relational formula (2), the value of n is 1, 2, 3, 4, 5...N. The frequencies fn in different segments may be different. As shown in Table 1, the combined data of the Fresnel surface are as follows:

Table 1 Combination data of Fresnel surface

The focal length of the Fresnel lens is F4, the total focal length of the optical system is F, and F4 and F satisfy the following relationship (3):

0.3≤|F4/F| (3);

In the above relational formula (3), the values of |F4/F| can be 0.3, 0.3455, 1.193, 0.3479, 0.3787, 0.472, and 10.61.

In the above embodiment, a combination of a new type of Fresnel surface type and traditional optical spherical surface and aspheric surface type is adopted, and the focal length of each lens and lens group can greatly eliminate the system aberration under the condition that specific conditions are met, The sensitivity of each optical component is reduced, the processing and assembly of the components are easy, and the optical indicators such as large field of view, low distortion, low chromatic aberration, low field curvature, and low astigmatism are realized.

In a further embodiment, the clear aperture of the Fresnel lens is D4, and D4 and F4 satisfy the following relational formula (4):

|D4/F4|≤2.5 (4);

In the above relational formula (4), the values of |D4/F4| can be 2.05, 0.073, 0.338, 0.45, 1.45, and 2.5.

In a further embodiment, the distance from the optical surface of the Fresnel lens close to the side of the micro-display device to the micro-display device is fd, and fd and F satisfy the following relational formula (5):

0.05≤fd/F≤1.0 (5);

In the above relational formula (5), the value of fd/F may be 0.05, 0.095, 0.2, 0.355, 0.499, 0.87, 0.89, and 1.0.

In a further embodiment, F4 and F further satisfy the following relational formula (6):

0.3455≤|F4/F| (6).

In a further embodiment, D4 and F4 further satisfy the following relational formula (7):

|D4/F4|≤2.05 (7).

In a further embodiment, fd and F further satisfy the following relational formula (8):

0.095≤fd/F≤0.89 (8).

By further optimizing the value range of the effective focal length of the Fresnel lens, the optical performance of the optical system and the difficulty of processing and manufacturing are better balanced.

In a further embodiment, each lens of the first lens group A1 and the second lens group A2 is made of glass material or plastic material, so that the aberrations of the eyepiece optical system are fully corrected at all levels, and at the same time, the The manufacturing cost of the optical element and the weight of the optical system.

In a further embodiment, the Fresnel lens further includes a common optical surface; the common optical surface is a plane, spherical or aspherical surface.

In a further embodiment, the surface type of each lens in the first lens group A1 is a spherical surface type, an even-order aspherical surface type or a Fresnel surface type, and the first lens group A1 and the second lens group A2 There is at least one axially symmetric aspherical lens; a combination of a new type of Fresnel surface and traditional optical spherical and aspherical surfaces is used, and the focal length of each lens and lens group can achieve system aberration under certain conditions It is greatly eliminated, the sensitivity of each optical component is reduced, the processing and assembly of the components are easy, and the optical indicators such as large field of view, low distortion, low chromatic aberration, low field curvature, and low astigmatism are realized.

In the above embodiment, the expression of the aspheric surface is

Among them, z is the sag of the optical surface, c is the curvature at the vertex of the aspheric surface, k is the aspheric coefficient, 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.

Below in conjunction with the description of the drawings and the specific embodiments, the present utility model will be further described: in the light path diagrams of the following embodiments, the light emitted from the microdisplay enters the personnel after passing through the Fresnel lens and the first lens group A1 in turn, The diaphragm can be the exit pupil of the eyepiece optical system imaging, which is a virtual light exit aperture. When the pupil of the human eye EYE is at the diaphragm position, the best imaging effect can be observed.

Example 1

The eyepiece design data of Example 1 are shown in the following table:

The eyepiece design data of the first embodiment of table 2

3 is a 2D structural diagram of the eyepiece optical system of the first embodiment, the optical structure is composed of four optical lenses, the first lens group A1 is composed of a first lens L1, a second lens L2 and a third lens L3, wherein the first lens group A1 is composed of a first lens L1, a second lens L2 and a third lens L3. The lens L1 and the third lens L3 are positive lenses, the second lens L2 is a negative lens, and the first optical surface 1, the third optical surface 3, the fourth optical surface 4, the fifth optical surface 5 and the sixth optical surface 6 are convex. The spherical or aspherical surface type facing the human eye, the second optical surface 2 is an even-order aspherical surface type concave to the human eye; the Fresnel lens in the second lens group A2 is L4, and the seventh optical surface 7 is an even-order aspherical surface type. Subaspherical surface, the eighth optical surface 8 is a Fresnel surface; wherein, the fourth-order coefficient of the parameters of the Fresnel surface of the eighth optical surface 8 is 1.57e-06, and the sixth-order coefficient is 6.9e-10 , the coefficient of the eighth term is -7.75e-13, and the coefficient of the tenth term is 4.4e-16. The focal length of the Fresnel lens is F4, the clear aperture of the Fresnel surface is D4, the total focal length of the optical structure system is F, and the distance from the eighth optical surface 8 to the micro display device is fd, where |F4/F| is 1.193, |D4/F4| is 1.425, and fd/F is 0.605.

Accompanying drawing 4, accompanying drawing 5, accompanying drawing 6 are respectively the scattered spot array diagram, distortion diagram and optical transfer function MTF diagram of the optical system, reflecting the light of each field of view of this embodiment on the image plane (display device I) The unit pixel has high resolution and small optical distortion. The resolution per 10mm per unit period is more than 0.78. The aberration of the optical system is well corrected. The display image with uniform and high optical performance can be observed through the eyepiece optical system.

Embodiment 2

The eyepiece design data of the second embodiment is shown in the following table:

The eyepiece design data of the second embodiment of table 3

7 is a 2D structural diagram of the eyepiece optical system of the second embodiment. Compared with the first embodiment, the main feature of the second embodiment is that the optical structure is composed of two optical lenses, and the first lens group A1 is composed of the first lens L1. , wherein, the first lens L1 is a negative lens; the surfaces of the first optical surface 1 and the second optical surface 2 are even-order aspherical surfaces convex to the human eye, and the Fresnel lens in the second lens group A2 is The second lens L2, wherein the third optical surface 3 is an even-order aspheric surface, and the fourth optical surface 4 is a Fresnel surface; the fourth-order coefficient of the parameters of the Fresnel surface of the fourth optical surface 4 is -4.1467078e -05, the coefficient of the sixth term is 2.5702072e-07, the coefficient of the eighth term is -1.1292358e-09, and the coefficient of the tenth term is 2.4473554e-12. The focal length of the Fresnel lens is F4, the clear aperture of the Fresnel surface is D4, the total focal length of the optical structure is F, and the distance from the fourth optical surface 4 to the micro display device is fd, where |F4/F| is 0.3479, |D4/F4| was 1.993, and fd/F was 0.941.

Fig. 8, Fig. 9, Fig. 10 are the scattered spot array diagram, the distortion diagram and the MTF diagram of the optical transfer function of the optical system, respectively, which reflect the light of each field of view of the present embodiment on the image plane (display device I) The unit pixel has high resolution and small optical distortion. The resolution per 10mm per unit period is more than 0.15. The aberration of the optical system is well corrected, and the display image with uniform and high optical performance can be observed through the eyepiece optical system.

Embodiment 3

The eyepiece design data of the third embodiment is shown in the following table:

The eyepiece design data of the third embodiment of table 4

11 is a 2D structural diagram of the eyepiece optical system of the third embodiment. Compared with the first embodiment and the second embodiment, the main feature of the third embodiment is that the optical structure consists of three optical lenses, wherein the first lens group A1 consists of the first The lens L1 and the second lens L2 are composed, wherein the first lens L1 is a positive lens, and the second lens L2 is a negative lens; Spherical surface, the second optical surface 2 and the third optical surface 3 are even-order aspherical surfaces concave to the human eye; the Fresnel lens in the second lens group A2 is the third lens L3, and the fifth optical surface 5 is an even-order aspheric surface, and the sixth optical surface 6 is a Fresnel surface. The focal length of the Fresnel lens is F4, the clear aperture of the Fresnel surface is D4, the total focal length of the optical structure is F, the distance from the sixth optical surface to the microdisplay device is fd, and its |F4/F| is 0.3787 , |D4/F4| is 2.0, and fd/F is 0.791.

Fig. 12, Fig. 13, Fig. 14 are respectively the scattered spot array diagram, the distortion diagram and the MTF diagram of the optical transfer function of the optical system, reflecting the light of each field of view in the present embodiment on the image plane (display device I) The unit pixel has high resolution and small optical distortion. The resolution per 10mm per unit period is more than 0.50. The aberration of the optical system is well corrected. The display image with uniform and high optical performance can be observed through the eyepiece optical system. .

Embodiment 4

The eyepiece design data of the fourth embodiment is shown in the following table:

The eyepiece design data of the fourth embodiment of table 5

15 is a 2D structural diagram of the eyepiece optical system of the fourth embodiment. Compared with the first embodiment, the second embodiment and the third embodiment, the main feature of the fourth embodiment is that the optical structure consists of three optical lenses, and the first lens The group A1 includes a Fresnel lens, wherein the first lens group A1 is composed of a first lens L1 and a second lens L2, and the first lens L1 is a positive lens, and the second lens L2 is a Fresnel lens; The surface shape of one optical surface 1 is an even-order aspheric surface that is convex to the human eye, the surface shape of the second optical surface 2 is a spherical surface that is concave to the human eye, and the surface shape of the third optical surface 3 is concave to the human eye. Even-order aspheric surface; the Fresnel lens in the second lens group A2 is the third lens L3, the fifth optical surface 5 is an even-order aspheric surface, and the sixth optical surface 6 is a Fresnel surface. The parameters of the Fresnel surface of the sixth optical surface 6 have a fourth-order coefficient of -4.8396642e-05, a sixth-order coefficient of 9.6819004e-08, an eighth-order coefficient of -1.60209e-10, and a tenth-order coefficient of -1.60209e-10. The term coefficient is 1.294112e-13. The focal length of the Fresnel lens is F4, the clear aperture of the Fresnel surface is D4, the total focal length of the optical structure is F, and the distance from the sixth optical surface 6 to the micro display device is fd, where |F4/F| is 0.472, |D4/F4| was 1.45, and fd/F was 0.93.

Fig. 16, Fig. 17, Fig. 18 are respectively the scattered spot array diagram, the distortion diagram and the MTF diagram of the optical transfer function of the optical system, which reflect the light of each field of view in this embodiment on the image plane (display device I) The unit pixel has high resolution and small optical distortion, the resolution per 10mm per unit period is more than 0.30, the aberration of the optical system is well corrected, and the display image with uniform and high optical performance can be observed through the eyepiece optical system. .

Embodiment 5

The eyepiece design data of the fifth embodiment is shown in the following table:

The eyepiece design data of the fifth embodiment of table 6

19 is a 2D structural diagram of the eyepiece optical system of the fifth embodiment. Compared with other embodiments, the main feature of the fifth embodiment is that the optical structure is composed of four optical lenses, and the first lens group A1 is composed of the first lens L1 , a second lens L2 and a third lens L3, wherein the first lens L1 and the third lens L3 are positive lenses, the second lens L2 is a negative lens, and the surface of the first optical surface 1 is convex to the human eye. Spherical surface, the third optical surface 3, the fourth optical surface 4, and the fifth optical surface 5 are even-order aspherical surfaces that are convex to the human eye, and the surfaces of the second optical surface 2 and the sixth optical surface 6 are The type is an even-order aspherical surface concave to the human eye; the Fresnel optical lens in the second lens group A2 is L4, and the seventh optical surface 7 is an even-order aspherical surface, and the eighth optical surface 8 is Fresnel. noodle. The parameters of the Fresnel surface of the eighth optical surface have a fourth-order coefficient of -1.6683367e-06, a sixth-order coefficient of 1.3777189e-10, an eighth-order coefficient of -1.2996377e-11, and a tenth-order coefficient of -1.2996377e-11. The coefficient is 6.9607322e-15. The focal length of the Fresnel lens is F4, the clear aperture of the Fresnel surface is D4, the total focal length of the optical structure is F, and the distance from the sixth optical surface 6 to the micro display device is fd, where |F4/F| is 10.61, |D4/F4| was 0.073, and fd/F was 0.62.

Fig. 20, Fig. 21, Fig. 22 are respectively the scattered spot array diagram, the distortion diagram and the MTF diagram of the optical transfer function of the optical system, which reflect the light of each field of view in the present embodiment on the image plane (display device I) The unit pixel has high resolution and small optical distortion. The resolution per 10mm per unit period is more than 0.50. The aberration of the optical system is well corrected. The display image with uniform and high optical performance can be observed through the eyepiece optical system. .

The data of the above-mentioned embodiment one to the fifth embodiment all meet the parameter requirements recorded in the content of the utility model, and the results are shown in Table 7 below:

The data of table 7 embodiment 1 to embodiment 5

F4/F D4/F4 fd/F Example 1 1.193 1.425 0.605 Embodiment 2 0.3479 1.993 0.941 Embodiment 3 0.3787 2.0 0.791 Embodiment 4 0.472 1.45 0.93 Embodiment 5 10.61 0.073 0.62

In another embodiment, the present invention also provides an eyepiece optical device with a large field of view and high image quality. The eyepiece optical device includes two microdisplay devices corresponding to the positions of the left and right eyes of a human, and also includes the aforementioned Optical system, the optical system is set at the position between the human eye and the micro display device, and the aberration of the system is fully corrected through the combination of the first lens group A1 and the Fresnel lens A2 through the positive and negative lenses, and the use of convex The first lens L1 of the eye and the Fresnel lens that can provide enough positive refractive power project the picture displayed by the micro display device to the human eye with the characteristics of high image quality, low distortion and large field of view; the observer can Through the eyepiece optical equipment, you can watch a large picture with full-frame high-definition, no distortion, and uniform image quality, achieving a high-presence visual experience. Wherein, the micro display device is an organic electroluminescence device or a transmissive liquid crystal display.

It should be understood that, for those skilled in the art, improvements or transformations can be made according to the above description, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.

Claims (10)

1. An eyepiece optical system with a large field of view and high image quality, characterized in that it comprises a first lens group and a second lens group that are sequentially arranged along the optical axis direction from the observation side of the human eye to the microdisplay; the The first lens group is composed of one or more lenses, the second lens group includes a Fresnel lens; the Fresnel lens includes a Fresnel surface; The Fresnel surface can be divided into N segments from the center to the edge, wherein the frequency in the nth segment is fn, and N and n satisfy the following relational expressions (1) and (2): N≥1 (1); 1≤n≤N (2); The focal length of the Fresnel lens is F4, the total focal length of the optical system is F, and F4 and F satisfy the following relational formula (3): 0.3≤|F4/F| (3). 2. eyepiece optical system according to claim 1, is characterized in that, the clear aperture of described Fresnel lens is D4, and D4 and F4 satisfy following relational formula (4): |D4/F4|≤2.5 (4). 3. eyepiece optical system according to claim 1, is characterized in that, the distance from the optical surface of described Fresnel lens close to one side of microdisplay device to microdisplay device is fd, and fd and F satisfy following relational formula ( 5): 0.05≤fd/F≤1.0 (5). 4. eyepiece optical system according to claim 1, is characterized in that, described F4 and F further satisfy following relational formula (6): 0.3455≤|F4/F| (6). 5. eyepiece optical system according to claim 2, is characterized in that, described D4 and F4 further satisfy following relational formula (7): |D4/F4|≤2.05 (7). 6. eyepiece optical system according to claim 3, is characterized in that, described fd and F further satisfy following relational formula (8): 0.095≤fd/F≤0.89 (8). 7 . The eyepiece optical system according to claim 1 , wherein each lens of the first lens group and the second lens group is made of glass material or plastic material. 8 . 8 . The eyepiece optical system according to claim 1 , wherein the Fresnel lens further comprises a common optical surface; and the common optical surface is a plane, spherical or aspherical surface. 9 . 9 . The eyepiece optical system according to claim 1 , wherein the surface type of each lens in the first lens group is a spherical surface type, an even-order aspherical surface type or a Fresnel surface type, and the There is at least one axisymmetric aspheric lens in the first lens group and the second lens group. 10. An eyepiece optical device with a large angle of view and high image quality, comprising two miniature display devices corresponding to the positions of the left and right eyes of a human, and further comprising the optical system as claimed in claims 1-9, The optical system is arranged at a position between the human eye and the micro display device, and projects the picture displayed by the micro display device to the human eye with the characteristics of high image quality, low distortion and large viewing angle.

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