CN216956526U - Near-to-eye display device optical system and near-to-eye display device - Google Patents
Near-to-eye display device optical system and near-to-eye display device Download PDFInfo
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Abstract
The application provides a near-eye display device optical system and near-eye display device, this optical system includes image generator, relay mirror group and optical combiner, image generator is used for sending image light, relay mirror group is used for leading image light to optical combiner, optical combiner includes first optical surface and second optical surface, first optical surface is the plane, the second optical surface is the sphere, image light incides to the second optical surface through first optical surface to from first optical surface outgoing to people's eye formation image after the second optical surface reflection, first optical surface and second optical surface still are used for transmitting ambient light to people's eye. A near-eye display device includes the optical system. The application provides an optical system, optical combiner's first optical surface is the plane, and the second optical surface is the sphere, and processing is simpler, has solved the complicated problem of current aspheric surface camera lens processing.
Description
Technical Field
The application relates to the technical field of display, in particular to a near-eye display device optical system and a near-eye display device.
Background
AR glasses (Augmented Reality glasses) are a common near-eye display device. The current AR glasses generally include an optical engine (light engine) and an optical combiner (optical combiner), where the optical engine is used as an image system and can display virtual information, light of the virtual information can enter human eyes through reflection of the optical combiner, so that a user can observe the virtual information, and the optical combiner can maintain a certain transmittance for ambient light while forming an image by reflecting the virtual display information, so as to enable the user to observe a real scene and virtual information at the same time. However, the conventional optical combiner is an aspherical mirror, and has the problems of complicated processing and the like, which leads to high cost of the AR glasses.
SUMMERY OF THE UTILITY MODEL
An object of the present application is to provide an optical system of a near-eye display device and a near-eye display device, so as to solve the above problems. The present application achieves the above object by the following technical solutions.
In a first aspect, an embodiment of the present application provides an optical system of a near-eye display device, where the optical system includes an image generator, a relay lens group, and an optical combiner, the image generator is configured to emit image light, the relay lens group is configured to guide the image light to the optical combiner, the optical combiner includes a first optical surface and a second optical surface, the first optical surface is a plane, the second optical surface is a spherical surface, the image light enters the second optical surface through the first optical surface, and is reflected by the second optical surface and then exits from the first optical surface to human eyes to form an image, and the first optical surface and the second optical surface are further configured to transmit ambient light to human eyes.
In a second aspect, an embodiment of the present application provides a near-eye display device, including a housing and the optical system of the first aspect, where the optical system is disposed in the housing.
According to the optical system and the near-to-eye display device provided by the embodiment of the application, the first optical surface of the optical combiner is a plane, the second optical surface of the optical combiner is a spherical surface, the processing is simpler, and the problem that the existing aspheric lens is complex to process is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical system provided in an embodiment of the present application.
Fig. 2 is an optical path diagram of an optical system provided in an embodiment of the present application.
Fig. 3 is a modulation transfer function representation of an optical system provided by an embodiment of the present application.
Fig. 4 is a tolerance curve of an optical system provided by an embodiment of the present application.
Fig. 5 is a distorted grid diagram of an optical system provided in an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a near-eye display device according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 and fig. 2 together, an optical system 100 for a near-eye display device is provided in an embodiment of the present application. Optical system 100 may include an image generator 110, a relay lens group 120, and an optical combiner 130. The image generator 110 may be a laser Light source such as a DLP (Digital Light Processing), so that the optical system 100 has the advantages of good directivity, high brightness, narrow wavelength bandwidth, high energy efficiency, and the like. Of course, in other embodiments, the image generator 110 may be a self-emitting display such as Micro-LED (Micro light emitting diode) or Micro-OLED (Micro organic light emitting diode), or an LCD (liquid crystal display) with backlight.
The image generator 110 is configured to emit image light, the relay lens group 120 and the optical combiner 130 are sequentially disposed on an emergent light path of the image generator 110, the relay lens group 120 is configured to guide the image light to the optical combiner 130, the optical combiner 130 includes a first optical surface 131 and a second optical surface 132, the first optical surface 131 is a plane, the second optical surface 132 is a spherical surface, the image light enters the second optical surface 132 through the first optical surface 131, is reflected by the second optical surface 132, and then is emitted from the first optical surface 131 to human eyes to form an image, and the first optical surface 131 and the second optical surface 132 are further configured to transmit ambient light to human eyes. Image light and environment light are superposed at human eyes, so that a user can observe a real scene and virtual information at the same time.
In the optical system 100 provided in the embodiment of the present application, the first optical surface 131 of the optical combiner 130 is a plane, and the second optical surface 132 is a spherical surface, which are simpler to process compared with an aspheric surface, and the problem of complex processing of the existing aspheric lens is solved.
In this embodiment, the relay lens group 120 is used for guiding the image light to the optical combiner 130 and simultaneously for magnifying the image. The image source displayed by the image generator 110 is amplified by the relay lens group 120 and then reflected to the human eye through the second optical surface 132, so that the human eye observes the amplified virtual image.
When the optical system 100 is worn on the head of a human body, the first optical surface 131 is located on the side of the second optical surface 132 facing the human eye. The second optical surface 132 may be an inner optical surface of the optical combiner 130, and the second optical surface 132 may be plated with a transflective film, which may be specifically implemented by a polarization-selective plating film, an inverse mode resonance film, or a discrete type plating reflective film. The second optical surface 132 may reflect incident image light to the first optical surface 131 through the transflective film and may also transmit ambient light to human eyes. The surface of the transflective film corresponding to the second optical surface 132 is a spherical surface.
In this embodiment, the optical system 100 may further include a transparent cover plate (not shown), such as a glass cover plate, where the transparent cover plate is covered on the light emitting surface of the image generator 110 to protect the image generator 110. The light-emitting surface of the image generator 110 is generally rectangular, and the image light is emitted through the light-emitting surface of the image generator 110, and the light-emitting surface of the image generator 110 is perpendicular to the optical axis of the image generator 110.
In some embodiments, the relay lens group 120 includes a first lens 121, a second lens 122, a third lens 123, a fourth lens 124, a fifth lens 125, a reflector 126, and a sixth lens 127, where the first lens 121, the second lens 122, the third lens 123, the fourth lens 124, the fifth lens 125, the reflector 126, and the sixth lens 127 are sequentially disposed along an exit optical path of the image generator 110, and are not coaxial with each other, that is, any two adjacent lenses of the first lens 121, the second lens 122, the third lens 123, the fourth lens 124, the fifth lens 125, the reflector 126, and the sixth lens 127 are not coaxial.
In this embodiment, the relay lens group 120 adopts an off-axis design, so that the exit pupil diameter and the exit pupil distance of the optical system 100 are relatively large. The optical combiner 130 is located on an exit light path of the sixth lens 127, and the mirror 126 is configured to reflect the image light exiting from the fifth lens 125 to the sixth lens 127, and refracts the image light to the optical combiner 130 through the sixth lens 127, so that the light path is folded, the optical system 100 is more compact, and the volume of the optical system 100 can be effectively reduced.
In some embodiments, the first lens 121 and the third lens 123 may be spherical lenses, the second lens 122, the fourth lens 124, the fifth lens 125, and the sixth lens 127 are aspherical lenses, and the reflecting mirror 126 is an aspherical reflecting mirror. The reflecting mirror 126 has a reflecting surface for reflecting the image light emitted from the fifth lens 125 to the sixth lens 127. The reflecting mirror 126 is an aspherical reflecting mirror, which means that the reflecting surface of the reflecting mirror 126 is aspherical. Through the lens combination, the field of view of the system can be enlarged, the divergent light rays can be collimated, and aberration correction can be performed on the light rays of each field of view.
In some embodiments, at least a portion of the light passes through the object-side and image-side surfaces of first lens 121, second lens 122, third lens 123, fourth lens 124, fifth lens 125, sixth lens 127, the reflective surface of mirror 126, the apex of first optical surface 131, and second optical surface 132.
In some embodiments, the first lens 121 and the third lens 123 are glass lenses, and have high light transmittance and high temperature resistance. The second lens 122, the fourth lens 124, the fifth lens 125, the sixth lens 127 and the reflector 126 may be plastic lenses made of the same plastic optical material. The plastic mirror can be manufactured in an injection molding mode, the injection molding mode can save mass production cost compared with cold processing, and the second lens 122, the fourth lens 124, the fifth lens 125, the sixth lens 127 and the reflector 126 are made of the same plastic optical material, so that only one mold is needed in the processing process, the number of the molds is reduced, and the processing and manufacturing are convenient.
As an example, the plastic optical material may be a resin material K26R, and has a refractive index of 1.535 and an abbe number of 56.
Further, a system coordinate system is established, the positive direction of the X axis is the horizontal direction when the human eyes of the wearer of the near-eye display device look straight ahead, the positive direction of the Z axis is the vertical upward direction, and the positive direction of the Y axis is determined according to the right-hand rule. Meanwhile, a reference plane ZOY is established, the reference plane ZOY is perpendicular to the X-axis, and the first optical surface 131 may be parallel to the reference plane ZOY.
In some embodiments, the angle between the light emitting surface of the image generator 110 and the reference plane ZOY is-30.49 to-37.27 °, the angle between the optical axis of the first lens 121 and the reference plane ZOY is-50.12 to-61.34 °, the angle between the optical axis of the second lens 122 and the reference plane ZOY is 13.26 to 16.20 °, the angle between the optical axis of the third lens 123 and the reference plane ZOY is-15.98 to-19.52 °, the angle between the optical axis of the fourth lens 124 and the reference plane ZOY is-11.48 to-14.04 °, the angle between the optical axis of the fifth lens 125 and the reference plane ZOY is 31.5 to 38.5 °, the angle between the optical axis of the reflector 126 and the reference plane ZOY is 28.44 to 34.76 °, and the angle between the optical axis of the sixth lens 127 and the reference plane ZOY is 76.5 to 93.5 °.
Taking the reference plane ZOY as a reference, clockwise rotating the reference plane ZOY to make the reference plane ZOY parallel to the light-emitting surface of the image generator 110 and the optical axes of the lenses, and making an included angle formed by the reference plane ZOY, the light-emitting surface of the image generator 110 and the optical axes of the lenses be a positive number; rotating the reference plane ZOY counterclockwise makes the reference plane ZOY parallel to the light-emitting surface of the image generator 110 and the optical axes of the lenses, and the included angle formed by the reference plane ZOY, the light-emitting surface of the image generator 110 and the optical axes of the lenses is negative. Under the control of the above conditions, the light path design of the relay lens group 120 satisfies structural rationality and lightness, and manufacturability and assemblability of the relay lens group 120 are improved.
The optical system 100 provided by the embodiment of the application has a large field angle, the horizontal field angle is 15.39-18.81 degrees, the vertical field angle is 9-11 degrees, the exit pupil diameter is in the range of 3.6-4.4 mm, and the exit pupil distance is in the range of 16.2-19.8 mm.
The horizontal field angle is the maximum viewing angle of the sight line of the wearer along the horizontal direction of the image when the wearer watches the image, and the vertical field angle is the maximum viewing angle of the sight line of the wearer along the vertical direction of the image when the wearer watches the image. For convenience of explanation, the horizontal direction and the vertical direction herein are exemplified by an image observed by the wearer as a two-dimensional image, the horizontal direction may be understood as a width direction of the image observed by the wearer, and the vertical direction may be understood as a height direction of the image observed by the wearer.
As an alternative embodiment, the design parameters of each optical surface of the optical system 100 may be as shown in table 1 below. An included angle between the light emitting surface of the image generator 110 and the reference plane is-33.88 degrees, an included angle between the optical axis of the first lens 121 and the reference plane is-55.74 degrees, an included angle between the optical axis of the second lens 122 and the reference plane is 14.73 degrees, an included angle between the optical axis of the third lens 123 and the reference plane is-17.76 degrees, an included angle between the optical axis of the fourth lens 124 and the reference plane is-12.76 degrees, an included angle between the optical axis of the fifth lens 125 and the reference plane is 35 degrees, an included angle between the optical axis of the reflector 126 and the reference plane is 31.6 degrees, and an included angle between the optical axis of the sixth lens 127 and the reference plane is 85 degrees. In this alternative embodiment, the exit pupil diameter of the optical system 100 is 4mm, the horizontal field of view is 10 °, the vertical field of view is 17.1 °, and the exit pupil distance is 18 mm.
Table 1: design parameter table for each optical surface
As shown in table 1, the image-side surface (surface number 20) of the first lens element 121 is convex, and the object-side surface (surface number 19) of the first lens element 121 is concave. The image-side surface (surface number 18) of the second lens element 122 is convex, and the object-side surface (surface number 17) of the second lens element 122 is convex. The image-side surface (surface number 16) of the third lens element 123 is concave, and the object-side surface (surface number 15) of the third lens element 123 is convex. The image-side surface (surface number 14) of the fourth lens element 124 is convex, and the object-side surface (surface number 13) of the fourth lens element 124 is concave. The image-side surface (surface number 12) of the fifth lens element 125 is concave, and the object-side surface (surface number 11) of the fifth lens element 125 is concave. The reflecting surface (surface number 10) of the reflecting mirror 126 is a concave surface. The image-side surface (surface number 9) of the sixth lens element 127 is concave, and the object-side surface (surface number 8) of the sixth lens element 127 is convex. The first optical surface 131 (surface numbers 7 and 5) is a flat surface, and the second optical surface 132 (surface number 6) is a convex surface. The object side surface is an exit surface of the image light, and the image side surface is an incident surface of the image light.
Further, aspheric parameters of the image-side surface (surface number 18) and the object-side surface (surface number 17) of the second lens 122 are shown in tables 2 and 3, respectively, aspheric parameters of the image-side surface (surface number 14) and the object-side surface (surface number 13) of the fourth lens 124 are shown in tables 4 and 5, respectively, aspheric parameters of the image-side surface (surface number 12) and the object-side surface (surface number 11) of the fifth lens 125 are shown in tables 6 and 7, respectively, aspheric parameters of the reflection surface (surface number 10) of the reflecting mirror 126 are shown in table 8, and aspheric parameters of the image-side surface (surface number 9) and the object-side surface (surface number 8) of the sixth lens 127 are shown in tables 9 and 10, respectively.
Table 2: aspheric parameter table of image side surface (surface number 18) of second lens element 122
| Parameter(s) | Value of |
| Curvature | -0.253686361 |
| Radius of sphere | -3.941875295 |
| Conic constant (K) | -39.12832924 |
| Coefficient of 4 th order (A) | -0.075610865 |
| Coefficient of order 6 (B) | 0.02668906 |
| Coefficient of order 8 (C) | -0.006645869 |
| Coefficient of order 10 (D) | 0.000464503 |
| Coefficient of order 12 (E) | 1.01E-05 |
| Coefficient of order 14 (F) | -8.92E-11 |
| Coefficient of order 16 (G) | 2.97E-16 |
| Coefficient of 18 th order (H) | 2.70E-19 |
| Coefficient of order 20 (J) | -1.53E-20 |
Table 3: aspheric parameters of the object-side surface (surface number 17) of the second lens 122
| Parameter(s) | Value of |
| Curvature of a circle | -0.172591812 |
| Radius of sphere | -5.794017615 |
| Conic constant (K) | -50 |
| Coefficient of 4 th order (A) | -0.01040956 |
| Coefficient of order 6 (B) | 0.019720548 |
| Coefficient of order 8 (C) | -0.006024154 |
| Coefficient of order 10 (D) | 0.001128571 |
| Coefficient of order 12 (E) | 1.25E-05 |
| Coefficient of order 14 (F) | 9.07E-06 |
| Coefficient of order 16 (G) | -1.36E-06 |
| Coefficient of 18 th order (H) | -4.54E-10 |
| Coefficient of order 20 (J) | -2.15E-13 |
Table 4: aspheric parameter of image-side surface (surface number 14) of fourth lens 124
Table 5: aspheric parameter of object-side surface (surface number 13) of fourth lens 124
| Parameter(s) | Value of |
| Curvature | 0.21274146 |
| Radius of sphere | 4.700541213 |
| Conic constant (K) | -19.70682537 |
| Coefficient of order 4 (A) | 0.018666384 |
| Coefficient of order 6 (B) | -0.004742329 |
| Coefficient of order 8 (C) | 0.000934054 |
| Coefficient of order 10 (D) | -9.91E-05 |
| Coefficient of order 12 (E) | 5.14E-06 |
| Coefficient of order 14 (F) | 2.73E-07 |
| Coefficient of order 16 (G) | -1.86E-07 |
| Coefficient of 18 th order (H) | 3.36E-08 |
| Coefficient of order 20 (J) | -1.91E-09 |
Table 6: aspheric parameter of image side surface (surface number 12) of fifth lens element 125
| Parameter(s) | Value of |
| Curvature | 0.087851769 |
| Radius of sphere | 11.38281007 |
| Conic constant (K) | -40.29196812 |
| Coefficient of 4 th order (A) | 0.00130015 |
| Coefficient of order 6 (B) | -0.000141246 |
| Coefficient of order 8 (C) | 6.20E-06 |
| Coefficient of order 10 (D) | 4.24E-07 |
| Coefficient of order 12 (E) | -2.45E-08 |
| Coefficient of order 14 (F) | -1.92E-09 |
| Coefficient of order 16 (G) | 3.50E-11 |
| Coefficient of 18 th order (H) | 1.10E-11 |
| Coefficient of order 20 (J) | -4.06E-13 |
Table 7: aspheric parameters of the object-side surface (surface number 11) of the fifth lens element 125
Table 8: aspherical surface parameter of reflecting surface (surface No. 10) of mirror 126
| Parameter(s) | Value of |
| Curvature of a circle | 0.010115946 |
| Radius of sphere | 98.85383026 |
| Conic constant (K) | 50 |
| Coefficient of order 4 (A) | 0.000171669 |
| Coefficient of order 6 (B) | -6.20E-07 |
| Coefficient of order 8 (C) | -4.56E-09 |
| Coefficient of order 10 (D) | -2.08E-11 |
| Coefficient of order 12 (E) | -1.59E-12 |
| Coefficient of order 14 (F) | -1.61E-14 |
| Coefficient of order 16 (G) | 2.06E-16 |
| Coefficient of 18 th order (H) | 3.47E-18 |
| Coefficient of order 20 (J) | -2.57E-20 |
Table 9: aspheric parameter of image-side surface (surface number 9) of sixth lens element 127
| Parameter(s) | Value of |
| Curvature | -0.028815222 |
| Radius of sphere | -34.70387981 |
| Conic constant (K) | -50 |
| Coefficient of order 4 (A) | 0.000182304 |
| Coefficient of order 6 (B) | 2.55E-07 |
| Coefficient of order 8 (C) | -1.39E-08 |
| Coefficient of order 10 (D) | -1.11E-10 |
| Coefficient of order 12 (E) | -4.17E-13 |
| Coefficient of order 14 (F) | 2.73E-15 |
| Coefficient of order 16 (G) | 7.99E-17 |
| Coefficient of 18 th order (H) | 1.98E-18 |
| Coefficient of order 20 (J) | -1.46E-20 |
Table 10: aspherical surface parameter of object side surface (surface number 8) of sixth lens element 127
The optical performance of the optical system 100 is demonstrated by specific experiments.
The Modulation Transfer Function (MTF) representation of optical system 100 is shown in fig. 3, where the ordinate represents the Modulation Transfer Function value and the abscissa represents the spatial frequency in cycles/mm (cycles per millimeter). As can be seen from fig. 3, when the number of line pairs per millimeter in an image is 30, the MTF of the full field is greater than 0.3, and the integrated resolution level of the optical system 100 is high.
The tolerance curve of the optical system 100 is shown in fig. 4, and it can be seen from the graph that the optical system 100 has strong tolerance resistance and high production yield.
As shown in fig. 5, the distortion grid of the optical system 100 is a graph in which the abscissa represents the horizontal field angle range and the ordinate represents the vertical field angle range, and it can be seen from fig. 5 that the distortion of the near-eye display device 100 is controllable to less than 10%.
Referring to fig. 2 and fig. 6, an embodiment of the present disclosure further provides a near-eye display device 200, where the near-eye display device 200 may include a housing 210 and the optical system 100 of any of the embodiments, and the optical system 100 is disposed in the housing 210.
In the near-to-eye display device 200 provided in the embodiment of the present application, the first optical surface 131 of the optical combiner 130 is a plane, and the second optical surface 132 is a spherical surface, which are simpler to process compared with aspheric surfaces, and thus the problem of complex processing of the existing aspheric lens is solved.
The near-eye display device 200 may be AR glasses, an AR helmet, or the like, and the present embodiment will be described with the near-eye display device 200 taken as AR glasses as an example. Corresponding to AR glasses, the housing 210 is a frame.
In this embodiment, the frame may include a frame 211, an arm 212, and a temple 213, wherein the arm 212 is connected to the frame 211, and the temple 213 is rotatably connected to an end of the arm 212 away from the frame 211. The optical combiner 130 is disposed on the lens frame 211, and the image generator 110 and the relay lens group 120 are disposed on the lens arm 212.
Specifically, the number of the two mirror arms 212 is two, the two mirror arms 212 are respectively and fixedly connected to two ends of the mirror frame 211 in the length direction, and each mirror arm 212 can be perpendicular to the mirror frame 211. The optical combiner 130 includes two optical combiners 130, and the two optical combiners 130 are both fixed to the frame 211 and are arranged at intervals along the length direction of the frame 211 to respectively correspond to the left and right eyes of the human body. Accordingly, the image generator 110 and the relay lens group 120 each include two groups, which are respectively disposed on the two lens arms 212. The number of the temples 213 is also two, and the two temples 213 are connected to the two temples 212, respectively.
For detailed structural features of the optical system 100, refer to the related descriptions of the above embodiments. Since the near-eye display device 200 includes the optical system 100 in the above embodiments, all the advantages of the optical system 100 are provided, and are not described herein again.
Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a near-to-eye display device optical system, its characterized in that, optical system includes image generator, relay mirror group and optical combiner, image generator is used for sending image light, relay mirror group is used for with image light guides to optical combiner, optical combiner includes first optical surface and second optical surface, first optical surface is the plane, second optical surface is the sphere, image light is incided to second optical surface through first optical surface to follow after the second optical surface reflection first optical surface is emergent to people's eye and is formed the image, first optical surface with second optical surface still is used for transmitting ambient light to people's eye.
2. The optical system of claim 1, wherein the relay lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a reflector and a sixth lens, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the reflector and the sixth lens are sequentially arranged along an emergent optical path of the image generator and are not coaxial with each other.
3. The optical system according to claim 2, wherein the first lens and the third lens are spherical lenses, the second lens, the fourth lens, the fifth lens and the sixth lens are aspherical lenses, and the mirror is an aspherical mirror.
4. The optical system of claim 2, wherein the second lens, the fourth lens, the fifth lens, the sixth lens and the reflector are plastic lenses made of the same plastic optical material.
5. The optical system of claim 2, wherein the first lens and the third lens are glass lenses.
6. The optical system according to claim 2, wherein an angle between a light emitting surface of the image generator and a reference plane is-30.49 ° to-37.27 °, an angle between an optical axis of the first lens and the reference plane is-50.12 ° to-61.34 °, an angle between an optical axis of the second lens and the reference plane is 13.26 ° to 16.20 °, an angle between an optical axis of the third lens and the reference plane is-15.98 ° to-19.52 °, an angle between an optical axis of the fourth lens and the reference plane is-11.48 ° to-14.04 °, an angle between an optical axis of the fifth lens and the reference plane is 31.5 ° to 38.5 °, an angle between an optical axis of the reflector and the reference plane is 28.44 ° to 34.76 °, and an angle between an optical axis of the sixth lens and the reference plane is 76.5 ° to 93.5 °; wherein the reference plane and the first optical surface are parallel to each other.
7. The optical system as claimed in claim 2, wherein the image-side surface and the object-side surface of the first lens element are respectively convex and concave, the image-side surface and the object-side surface of the second lens element are respectively convex, the image-side surface and the object-side surface of the third lens element are respectively concave and convex, the image-side surface and the object-side surface of the fourth lens element are respectively convex and concave, the image-side surface and the object-side surface of the fifth lens element are respectively concave, the reflective surface of the reflective mirror is concave, and the image-side surface and the object-side surface of the sixth lens element are respectively concave and convex.
8. The optical system according to any one of claims 1 to 7, wherein the horizontal angle of view of the optical system is 15.39 ° to 18.81 ° and the vertical angle of view is 9 ° to 11 °.
9. An optical system as claimed in any one of claims 1 to 7, characterized in that the exit pupil diameter of the optical system is 3.6mm to 4.4 mm.
10. A near-eye display device comprising a housing and the optical system of any one of claims 1-9 disposed on the housing.
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