Optical system and VR glasses

Abstract

The utility model discloses an optical system and VR glasses, and relates to the technical field of VR equipment, and the optical system comprises a first lens, a second lens and a third lens which are sequentially arranged from the image side to the object side. Wherein the end face, close to the image side, of the first lens is plated with a semi-reflective semi-permeable film, the end face, close to the object side, of the first lens is plated with an AR antireflection film, and the first lens is movably arranged between the second lens and the image side in the optical axis direction and used for adjusting the diopter of the optical system; the end face, close to the image side, of the second lens is plated with an AR antireflection film, the end face, close to the object side, of the second lens is glued with a quarter-wave plate film, and the end face, away from the second lens, of the quarter-wave plate film is glued with a linear polarization film. The two end faces, close to the image side and the object side, of the third lens are plated with AR antireflection films. The diopter of the optical system in the scheme is adjustable, so that the requirements of different diopters of different users can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of VR devices, and particularly relates to an optical system and a VR glasses. Background Art

[0002] With the advent of the digital age, people rely more and more on electronic devices for work and entertainment. Long-term screen contact has led to an increasingly common eyesight problem, especially the incidence of myopia is rising continuously among teenagers. Therefore, the market demand for products that can effectively relieve visual fatigue and prevent and treat myopia is increasing. After years of development, virtual reality (VR) technology has expanded from the fields of games and entertainment to multiple industries such as education and medical care. Especially in the medical field, VR technology has been used for pain management, rehabilitation training, etc. This provides a technical basis and innovative ideas for developing vision exercise devices using VR technology.

[0003] At present, there have been some products for vision exercise on the market, such as vision training software, eye massagers, etc. However, these products cannot be adjusted individually according to the different eyesights of different users, lack personalized settings, and have poor universality. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose an optical system and a VR glasses, aiming to solve the problem that the existing vision exercise products lack personalized settings and have poor adaptability.

[0005] To achieve the above purpose, the utility model proposes an optical system. The optical system has an object side and an image side that are oppositely arranged along the extending direction of the optical axis. The optical system includes a first lens, a second lens, and a third lens that are sequentially arranged from the image side to the object side.

[0006] Wherein, a semi-reflective and semi-transmissive film is coated on the end face of the first lens close to the image side, and an AR anti-reflection film is coated on the end face close to the object side. The first lens is movably arranged between the second lens and the image side along the optical axis direction to adjust the diopter of the optical system.

[0007] An AR anti-reflection film is coated on the end face of the second lens close to the image side, and a quarter-wave plate film is glued on the end face close to the object side. A linear polarizing film is glued on the end face of the quarter-wave plate film facing away from the second lens.

[0008] AR anti-reflection films are coated on both end faces of the third lens close to the image side and the object side.

[0009] In an embodiment, the light rays from the image side of the optical system sequentially pass through the first lens, the second lens, and the quarter-wave plate film, and are reflected by the linear polarizing film to form a primary reflected light.

[0010] The primary reflected light sequentially passes through the quarter-wave plate film, the second lens, and the first lens, and is reflected by the semi-transparent and semi-reflective film on the end face of the first lens close to the image side to form secondary reflected light;

[0011] The secondary reflected light sequentially passes through the first lens, the second lens, the quarter-wave plate film, and the linear polarization film, and reaches the object side of the optical system.

[0012] In one embodiment, the diopter of the optical system is between -7D and +3D.

[0013] In one embodiment, the first lens is a biconvex lens;

[0014] The second lens is a plano-concave lens, and its image-side surface is concave;

[0015] The third lens is a convex-concave lens, and its image-side surface is concave.

[0016] In one embodiment, the optical power of the first lens is positive;

[0017] The optical power of the second lens is negative;

[0018] The optical power of the second lens is positive.

[0019] In one embodiment, the expansion coefficient of the first lens is P1, where 50 < P1 < 70;

[0020] The expansion coefficient of the second lens is P2, where 50 < P2 < 70;

[0021] The expansion coefficient of the third lens is P3, where 50 < P3 < 70.

[0022] In one embodiment, at least one of the first lens, the second lens, and the third lens is an aspherical lens.

[0023] In one embodiment, the material of at least one of the first lens, the second lens, and the third lens is a plastic material.

[0024] In one embodiment, the surface shape of the aspherical surface of any one of the first lens, the second lens, and the third lens satisfies Formula I, and Formula I is:

[0025]

[0026] Among them, c is the curvature corresponding to the radius, y is the radial coordinate and its unit is the same as the lens length unit, k is the conic quadratic curve coefficient, and a1 to a8 are the coefficients corresponding to each radial coordinate.

[0027] The present utility model also provides a VR glasses, which includes:

[0028] A housing;

[0029] The above-mentioned optical system, which is disposed in the housing. The optical system has an object side and an image side that are oppositely arranged along the extending direction of the optical axis. The optical system includes a first lens, a second lens, and a third lens that are sequentially arranged from the image side to the object side;

[0030] Wherein, a semi-reflective and semi-transmissive film is coated on the end face of the first lens close to the image side, and an AR anti-reflection film is coated on the end face close to the object side. The first lens is movably arranged between the second lens and the image side along the optical axis direction to adjust the diopter of the optical system;

[0031] An AR anti-reflection film is coated on the end face of the second lens close to the image side, and a quarter-wave plate film is glued on the end face close to the object side. A linear polarizing film is glued on the end face of the quarter-wave plate film facing away from the second lens;

[0032] AR anti-reflection films are coated on both end faces of the third lens close to the image side and the object side;

[0033] A display component, which is disposed in the housing and is oppositely arranged with the image side of the optical system, and is used to project an image to the optical system;

[0034] A control component, which is signal-connected to the display component and is used to control the display content of the display component.

[0035] According to the technical solution of the present utility model, by movably arranging the first lens on the optical axis, the diopter of the optical system can be adjusted, so as to adapt to the requirements of different users with different diopters, and the applicability of the optical system is wider. Further, on the light propagation path, by adding a phase compensation element on the optical path between the first lens, the second lens and the linear polarizing film to perform polarization compensation on the polarized light transmitted between the lens module and the linear polarizing film, the polarized light incident on the linear polarizing film is the corresponding linear polarized light; in this way, the light depolarization caused by the birefringence effect of the lens can be effectively compensated, which is beneficial to eliminating ghost images and ensuring the light effect, thereby improving the imaging quality and the viewing effect of users. Description of the Drawings

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0037] Figure 1 Schematic structural diagram of an embodiment of the optical system provided by the present invention;

[0038] Figure 2 For Figure 1 Optical path diagram of the optical system at 0 diopters in

[0039] Figure 3 For Figure 1 Optical path diagram of the optical system at +3 diopters in

[0040] Figure 4 For Figure 1 Optical path diagram of the optical system at -7 diopters in

[0041] Figure 5 For Figure 1 MTF schematic diagram of the optical system at 0 diopters in

[0042] Figure 6 For Figure 1 MTF schematic diagram of the optical system at +3 diopters in

[0043] Figure 7 For Figure 1 MTF schematic diagram of the optical system at -7 diopters in

[0044] Explanation of the reference numerals in the drawings:

[0045] 1. First lens; 2. Second lens; 3. Third lens; 4. Quarter-wave plate film; 5. Linear polarizing film; 6. Image side; 7. Object side.

[0046] The realization of the objectives, functional features, and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0048] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0049] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0050] With the advent of the digital age, people increasingly rely on electronic devices for work and entertainment. Long hours of screen contact have led to an increasingly common eyesight problem, especially the increasing incidence of myopia among teenagers. Therefore, the market demand for products that can effectively relieve eye fatigue and prevent and treat myopia is growing. After years of development, virtual reality (VR) technology has expanded from the fields of gaming and entertainment to multiple industries such as education and healthcare. Especially in the medical field, VR technology has been used for pain management, rehabilitation training, etc. This provides a technical basis and innovative ideas for developing vision exercise devices using VR technology.

[0051] Currently, there are already some products for vision exercise on the market, such as vision training software, eye massagers, etc. However, these products cannot be adjusted according to the different eyesight of different users, lack personalized settings, and have poor universality.

[0052] The main purpose of the present utility model is to propose an optical system and a VR glasses, aiming to solve the problem that the existing vision exercise products lack personalized settings and have poor adaptability.

[0053] Please refer to Figure 1, the present utility model provides an optical system. The optical system has an object side 7 and an image side 6 that are oppositely arranged along the extending direction of the optical axis. The optical system includes a first lens 1, a second lens 2, and a third lens 3 that are sequentially arranged from the image side 6 to the object side 7. Among them, a semi-reflective and semi-transmissive film is coated on the end face of the first lens 1 close to the image side 6, and an AR anti-reflection film is coated on the end face close to the object side 7. The first lens 1 is movably arranged between the second lens 2 and the image side 6 along the optical axis direction to adjust the diopter of the optical system. An AR anti-reflection film is coated on the end face of the second lens 2 close to the image side 6, and a quarter-wave plate film 4 is glued on the end face close to the object side 7. A linear polarizing film 5 is glued on the end face of the quarter-wave plate film 4 facing away from the second lens 2. AR anti-reflection films are coated on both end faces of the third lens 3 close to the image side 6 and the object side 7.

[0054] According to the technical solution of the present utility model, by movably arranging the first lens 1 on the optical axis, the diopter of the optical system can be adjusted, so as to adapt to the requirements of different diopters of different users, and the applicability of the optical system is wider. Further, on the light propagation path, by adding a phase compensation element on the optical path between the first lens 1, the second lens 2 and the linear polarizing film 5, polarization compensation is performed on the polarized light transmitted between the lens module and the linear polarizing film 5, so that the polarized light incident on the linear polarizing film 5 is the corresponding linear polarized light. In this way, the depolarization of light caused by the birefringence effect of the lens can be effectively compensated, which is beneficial to eliminating ghost images and ensuring the light effect, thereby improving the imaging quality and improving the viewing effect of users.

[0055] In an embodiment of the present utility model, please refer to Figure 1 , the light transmission path is as follows: The light from the image side 6 of the optical system sequentially passes through the first lens 1, the second lens 2, and the quarter-wave plate film 4, and is reflected by the linear polarizing film 5 to form a primary reflected light. The primary reflected light sequentially passes through the quarter-wave plate film 4, the second lens 2, and the first lens 1, and is reflected by the semi-reflective and semi-transmissive film on the end face of the first lens 1 close to the image side 6 to form a secondary reflected light. The secondary reflected light sequentially passes through the first lens 1, the second lens 2, the quarter-wave plate film 4, and the linear polarizing film 5 and reaches the object side 7 of the optical system.

[0056] Specifically, in this embodiment, when the primary reflected light sequentially passes through the quarter-wave plate film 4, the second lens 2, and the first lens 1 from the linear polarizing film 5, the polarization state between the quarter-wave plate film 4 and the second lens 22 is vertical linear polarization, and the polarization state between the second lens 2 and the first lens 1 is counterclockwise circular polarization. When the secondary reflected light sequentially passes through the first lens 1, the second lens 2, the quarter-wave plate 3 film, and the linear polarizing film 5 and reaches the object side 7 of the optical system, the polarization state between the first lens 1 and the second lens 2 is clockwise circular polarization, the polarization state between the second lens 2 and the quarter-wave plate film 4 is clockwise circular polarization, the polarization state between the quarter-wave plate film 4 and the linear polarizing film 5 is horizontal linear polarization, and the polarization state between the second lens 2 and the object side 7 is horizontal linear polarization.

[0057] Further, please refer to Figures 2 to 4 , and adjust the diopter of the optical system so that the optical system can adapt to myopic users, hyperopic users, and users with normal vision. Specifically, the diopter of the optical system is between -7D and +3D, and the corresponding virtual image distances are approximately -0.143m and +0.333m at this time.

[0058] In a specific embodiment, please refer to Figure 1 , the first lens 1 is a biconvex lens; the second lens 2 is a plano-concave lens, and its image side 6 surface is concave; the third lens 3 is a convex-concave lens, and its image side 6 surface is concave.

[0059] Specifically, the optical power of the first lens 1 is positive, which focuses the light rays, bears a relatively large optical power of the system, changes the propagation direction of the light beam, and is more conducive to the light beam imaging on the image plane; the optical power of the second lens 2 is negative, which is conducive to the collection of light rays of the optical system and can effectively increase the field of view; the optical power of the third lens 3 is positive, which further focuses the light rays. Through the reasonable setting of the optical powers of the three lenses and the conditional limitation of the optical system, finally, the optical system can achieve clear imaging.

[0060] The expansion coefficients of the first lens 1, the second lens 2, and the third lens 3 can specifically be set to 52, 54, 56, 58, 60, 62, 64, 66, 68, etc. The parameter of the expansion coefficient characterizes the change of the length of the lens with temperature when the temperature changes. The change of temperature will cause changes in the curvature, aperture, and thickness of the lens. Whether it is the change of refractive index or the change of length will cause the change of the optical power of the lens, and then cause the displacement of the focal plane of the entire optical system. Therefore, select appropriate materials so that the expansion coefficient of the lens can meet the imaging requirements of the optical system.

[0061] It should be noted that within the above expansion coefficient range, it can ensure the smooth transmission of light in the optical system, which is beneficial to eliminating ghost images and ensuring light efficiency, thereby improving the imaging quality and the user's viewing effect. As a preferred embodiment of this embodiment, the expansion coefficient P1 of the first lens 1 is 60, the expansion coefficient P2 of the second lens 2 is 60, and the expansion coefficient P3 of the third lens 3 is 60.

[0062] Specifically, at least one of the first lens 1, the second lens 2, and the third lens 3 is made of plastic material. Compared with the setting of glass material, plastic material is more preferred. Plastic material is lighter, and using plastic aspheric surfaces can better correct aberrations.

[0063] Specifically, at least one of the first lens 1, the second lens 2, and the third lens 3 is an aspheric lens. Because aspheric lenses are flatter, thinner, and provide a more realistic view. Most VR lenses use aspheric lenses, so that the picture we see can be restored more realistically without local deformation and distortion. While spherical lenses will produce slight distortion of the image at the edge field of view, reducing spherical aberration.

[0064] In this embodiment, the surface shape of the aspheric surface of any one of the first lens 1 and the second lens 2 satisfies Formula I, and Formula I is:

[0065]

[0066] Wherein, c is the curvature corresponding to the radius, y is the radial coordinate with the same unit as the lens length unit, k is the conic quadratic curve coefficient, and a1 to a8 are the coefficients corresponding to each radial coordinate.

[0067] In this embodiment, taking F8.7 as an example, the actual design parameters of a VR-pancake with a focal length of 36.1mm are as shown in Table 1. For the convenience of description, the two opposite end faces of the first lens 1 are respectively the first lens S1 and the first lens S2; the two opposite end faces of the second lens 2 are respectively the second lens S1 and the second lens S2; the two opposite end faces of the third lens 3 are respectively the third lens S1 and the third lens S2.

[0068] Table 1

[0069] Surface number Type Radius R Thickness Optical material Aperture OBJ Object surface Infinity -1500 - Third lens S2 Spherical surface 59.513 2.182 H-ZLAF50E 13.9 Third lens S1 Spherical surface 135.629 0.879 14.1 Second lens S2 Spherical surface Infinity 1.339 H-ZF72A 20.1 Second lens S1 Spherical surface 197.421 3.700 20.2 First lens S2 Aspherical surface 142.203 8.252 APL5013VH 21.3 First lens S1 Aspherical surface -139.653 - -

[0070] Furthermore, in this embodiment, the coefficients of the first lens S2 and the first lens S1 are as shown in Table 2 and Table 3.

[0071] Table 2 Coefficients of the first lens S2

[0072] Coefficient k 18.493 <![CDATA[a1]]> 0 <![CDATA[a2]]> 7.156E-07 <![CDATA[a3]]> 3.052E-09 <![CDATA[a4]]> -3.380E-12 <![CDATA[a5]]> -6.111E-16 <![CDATA[a6]]> -8.261E-18 <![CDATA[a7]]> 1.915E-20 <![CDATA[a8]]> -4.647E-23

[0073] Coefficients of the first lens S1 in Table 3

[0074]

[0075]

[0076] It should be noted that in the above table, the two opposite end faces of the first lens 1 are S1 of the first lens and S2 of the first lens respectively; the two opposite end faces of the second lens 2 are S1 of the second lens and S2 of the second lens respectively, and the two opposite end faces of the third lens 3 are S1 of the third lens and S2 of the third lens respectively. Among them, the end face of each lens close to the image side 6 of the optical system is S1, and the end face close to the object side 7 of the optical system is S2.

[0077] Figures 5 to 7 It is the MTF graph of the optical system at different diopters. It can be seen from the graph that the MTF basically exceeds 0.35 at different diopters, basically meeting the requirements of high-quality imaging.

[0078] The present utility model also provides a VR glasses, which includes a housing, an optical system, a display component and a control component. The optical system is arranged in the housing, and the specific structure of the optical system refers to the above-mentioned embodiment. The display component is arranged in the housing and is oppositely arranged with the image side 6 of the optical system for projecting an image to the optical system. The control component is signal-connected to the display component for controlling the display content of the display component.

[0079] Since the VR glasses include the optical system, and the specific structure of the optical system refers to the above-mentioned embodiment. Since the optical system of this VR glasses adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0080] It can be understood that the control component can be remotely controlled by a Bluetooth controller or can be a control button arranged on the housing. This solution does not make specific restrictions on this.

[0081] The technical solution provided by the present utility model can be used for vision training more conveniently at any time and place. By watching VR stereoscopic videos of the display component, etc., it can simulate far vision and near vision activities, and then can train the ciliary muscle function, relieve ciliary muscle spasm, and then can relieve visual fatigue and slow down the progression of myopia; by operating the control component to interact with the display component, the purpose of intelligent vision training can be achieved.

[0082] The following is the vision training method of the VR glasses in an embodiment, and the specific steps include:

[0083] a. Detect eyesight;

[0084] b. Basic training;

[0085] c. Enhancement training;

[0086] d. Relaxation training.

[0087] Step a is to wear VR glasses. The display component plays an eye chart, and the operation control component is controlled by voice prompts to detect eyesight. Without a paper eye chart, eyesight can be detected. When detecting, one side of the micro display on the VR glasses lights up, and the other side does not. The eye chart is played on the lit micro display. The person being tested observes a certain eyesight mark on the eye chart according to the voice prompts and gives feedback through the operation control component, so as to judge the eyesight of the person being tested.

[0088] Step b is to wear VR glasses. The glasses play dynamic icons that continuously zoom in and out and move along a certain trajectory. By playing dynamic icons that continuously zoom in and out and move along a certain trajectory through the display component, the eyes are guided to make multi-directional movements such as up and down, left and right, figure-eight, square, near and far along the icon movement trajectory, so as to exercise the ciliary muscle and strengthen the function of the ciliary muscle to adjust the lens, thereby improving eyesight.

[0089] Step c is to wear VR glasses. The display component calls and plays black-and-white dynamic markers and anti-color static markers corresponding to the actual detected eyesight (for example: left eye 0.7, right eye 1.0) value according to step a. The black-and-white dynamic marker is a white background with a black E-shaped or C-shaped marker that continuously moves from far to near, from clear to blurred, from large to small, and in different orientations, and covers the right eye (monocular training) to let the left eye distinguish and judge the orientation of the E-shaped or C-shaped marker, and then operate the control component to confirm. If correct, enter the next-level marker; if incorrect, return to the previous-level marker, and repeat the recognition exercise; the anti-color static marker is a red background with a randomly positioned and stationary green E-shaped or C-shaped marker or a blue background with a randomly positioned and stationary yellow E-shaped or C-shaped marker, and the human eye is asked to judge the orientation of the E-shaped or C-shaped marker, and then operate the control component to confirm. If correct, enter the next-level marker; if incorrect, return to the previous-level marker, and repeat the recognition exercise. In this way, while exercising the ciliary muscle, the ability of the human brain to analyze and adjust images is strengthened, realizing the dual exercise of the ciliary muscle and the visual function of the brain.

[0090] Step d is to wear VR glasses. The display component plays markers or pictures that gradually change from near to far and from bright to dark. In this way, it can simulate looking into the distance and light attenuation, further exercising the muscles around the eyes and relaxing the ciliary muscle.

[0091] Among them, step b is 5 minutes, step c is 50 minutes, and step d is 10 minutes; the dynamic icon is a dot or other regular polygon; the indicator is an E-shaped or C-shaped indicator.

[0092] In a specific case, after step a, the binocular uncorrected visual acuity is detected to be 0.7. Under the frequency of training once a day, after several months of training, step a is detected again, and the binocular uncorrected visual acuity is 0.7, and the increase in myopia degree is effectively controlled. There is no obvious change in the refractive power of the human eye and binocular visual function (such as stereopsis and accommodation amplitude) after wearing the VR device, while the choroid thickness of the human eye will thicken. The thickening of the choroid may be related to myopic defocus, so it can delay the deepening of myopia.

[0093] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An optical system, characterized in that, The optical system has an object side and an image side that are relatively arranged along the extending direction of the optical axis. The optical system includes a first lens, a second lens, and a third lens that are sequentially arranged from the image side to the object side. Wherein, a semi-reflective and semi-transmissive film is coated on the end face of the first lens close to the image side, and an AR anti-reflection film is coated on the end face close to the object side. The first lens is movably arranged between the second lens and the image side along the optical axis direction to adjust the diopter of the optical system. An AR anti-reflection film is coated on the end face of the second lens close to the image side, and a quarter-wave plate film is glued on the end face close to the object side. A linear polarizing film is glued on the end face of the quarter-wave plate film facing away from the second lens. AR anti-reflection films are coated on both end faces of the third lens close to the image side and the object side.

2. The optical system according to claim 1, wherein The light rays from the image side of the optical system sequentially pass through the first lens, the second lens, and the quarter-wave plate film, and are reflected by the linear polarizing film to form a primary reflected light. The primary reflected light sequentially passes through the quarter-wave plate film, the second lens, and the first lens, and is reflected by the semi-reflective and semi-transmissive film on the end face of the first lens close to the image side to form a secondary reflected light. The secondary reflected light sequentially passes through the first lens, the second lens, the quarter-wave plate film, and the linear polarizing film, and reaches the object side of the optical system.

3. The optical system according to claim 1, characterized in that, The diopter of the optical system is between -7D and +3D.

4. The optical system according to claim 1, wherein, The first lens is a biconvex lens. The second lens is a plano-concave lens, and its image-side surface is concave. The third lens is a convex-concave lens, and its image-side surface is concave.

5. The optical system according to claim 1, wherein The optical power of the first lens is positive. The optical power of the second lens is negative. The optical power of the second lens is positive.

6. The optical system according to claim 1, wherein The expansion coefficient of the first lens is P1, where 50 < P1 < 70. The expansion coefficient of the second lens is P2, where 50 < P2 < 70. The expansion coefficient of the third lens is P3, where 50 < P3 < 70.

7. The optical system according to claim 1, characterized in that, At least one of the first lens, the second lens, and the third lens is made of plastic material.

8. The optical system according to claim 1, wherein At least one of the first lens, the second lens, and the third lens is an aspherical lens.

9. The optical system according to claim 8, wherein The surface shape of the aspherical surface of any one of the first lens, the second lens, and the third lens satisfies Formula I, and Formula I is: Wherein, c is the curvature corresponding to the radius, y is the radial coordinate whose unit is the same as the lens length unit, k is the conic quadratic curve coefficient, and a1 to a8 are the coefficients corresponding to each radial coordinate.

10. A VR glasses, characterized in that, Including: A housing; The optical system according to any one of claims 1 to 9, and the optical system is arranged in the housing; A display component, arranged in the housing and relatively arranged with the image side of the optical system, for projecting an image to the optical system; A control component, signal-connected to the display component, for controlling the display content of the display component.

Images