An augmented reality optical system and device

Abstract

The application provides an augmented reality optical system and device, the augmented reality optical system comprising a receiver, a lens group and an image display, the lens group comprising a first lens, a second lens and a third lens; wherein a composite film is arranged on the third optical side, the composite film comprising a first polarizing film and a polarization reflection film; a quarter-wave plate is arranged on the sixth optical side; a semi-transparent semi-reflective film is arranged on the seventh optical side; the augmented reality optical system satisfies the following conditional expression: 0.20 <= TD / TTL <= 0.26. By designing the first lens, the second lens and the third lens to cooperate to form a three-piece optical path folding structure, and arranging the first polarizing film, the polarization reflection film, the quarter-wave plate and the semi-transparent semi-reflective film, higher optical performance can be obtained, and the imaging quality of the augmented reality optical system is improved. Moreover, the augmented reality optical system can have a smaller size under the condition of satisfying the above conditional expression, so that miniaturization is realized.

Description

[Technical Field] This invention relates to the field of virtual reality equipment technology, and more particularly to an augmented reality optical system and device. [Background Technology] In related technologies, with the continuous advancement of technology and the gradual rise of interactive devices such as Augmented Reality (AR), the application scope of projection optical systems is becoming increasingly wide. AR devices project virtual images onto the human eye through near-eye display devices, allowing users to simultaneously receive information from both the real and virtual worlds, thus obtaining a super-sensory visual experience. However, current AR devices are large in size and have poor image quality.

[0001] Therefore, it is necessary to provide a new augmented reality optical system. [Summary of the Invention] The purpose of this invention is to provide an augmented reality optical system and device that can solve the technical problems of large size and poor imaging quality of AR devices in related technologies.

[0002] The technical solution of the present invention is as follows: An augmented reality optical system includes a receiver, a lens group, and an image display arranged sequentially from the light-emitting side to the light-receiving side. The lens group includes a first lens, a second lens, and a third lens arranged sequentially from the light-emitting side to the light-receiving side. The first lens has a first optical side and a second optical side arranged opposite to each other. The second lens has a third optical side, a fourth optical side, and a fifth optical side connected sequentially. The third lens has a sixth optical side and a seventh optical side arranged opposite to each other. The third optical side is positioned opposite to the second optical side, and the fourth optical side is positioned opposite to the sixth optical side. The image display is positioned opposite to the fifth optical side, and the receiver is positioned opposite to the first optical side. A light beam emitted by the image display passes sequentially through the fifth optical side, the fourth optical side, the third optical side, the fourth optical side, the sixth optical side, the seventh optical side, the sixth optical side, the fourth optical side, the third optical side, the second optical side, and the first optical side, and is received by the receiver. The third optical side is provided with a composite film, which includes a first polarizing film and a polarizing reflection film; the sixth optical side is provided with a quarter-wave plate; the seventh optical side is provided with a semi-transparent and semi-reflective film; the augmented reality optical system satisfies the following condition: 0.20≤TD / TTL≤0.26; Wherein, TD is the on-axis distance from the first optical side to the seventh optical side, and TTL represents the total optical length of the augmented reality optical system.

[0003] Optionally, the augmented reality optical system satisfies the following condition: 55mm≤TTL≤70mm.

[0004] Optionally, the augmented reality optical system satisfies the following condition: 45°≤FOV≤56°; Wherein, FOV represents the field of view of the augmented reality optical system.

[0005] Optionally, the augmented reality optical system satisfies the following condition: eye relief ≥ 18mm; Wherein, eyerelief refers to the distance between the receiver and the first optical side.

[0006] Optionally, the image display may be moved relative to the fifth optical side along the optical axis to adjust the diopter of the augmented reality optical system, the diopter adjustment range being -6D to 0D.

[0007] Optionally, the reflectivity of the polarizing reflective film is greater than or equal to 95%, the reflectivity of the semi-transparent and semi-reflective film is in the range of 40%-60%, and the transmittance of the semi-transparent and semi-reflective film is in the range of 40%-60%.

[0008] Optionally, the first optical side is an aspherical surface or a plane, and the sixth optical side is an aspherical surface or a plane.

[0009] Optionally, the lens group further includes a fourth lens disposed between the image display and the second lens, the fourth lens being a plastic lens.

[0010] Optionally, a second polarizing film is provided on the side of the image display closest to the fifth optical side.

[0011] Optionally, the third lens has positive optical power, the light-emitting side of the third lens is convex at the paraxial position, the light-incident side of the third lens is convex at the paraxial position, and the augmented reality optical system also satisfies the following condition: 1.05≤f³ / f≤1.15; 0.052≤d6 / TTL≤0.072; Wherein, f represents the focal length of the augmented reality optical system, f3 represents the focal length of the third lens, and d6 represents the on-axis thickness of the third lens.

[0012] Optionally, the augmented reality optical system satisfies the following condition: 0.99≤SD4 / SD6≤1.06; Wherein, SD4 represents the aperture of the fourth optical side, and SD6 represents the aperture of the sixth optical side.

[0013] Optionally, the first lens and the second lens are bonded and fixed together.

[0014] The beneficial effects of this invention are as follows: by designing a three-piece optical path folding structure with the first, second, and third lenses working together, and by setting a first polarizing film and a polarizing reflection film on the third optical side of the second lens, a quarter-wave plate on the sixth optical side of the third lens, and a semi-transparent and semi-reflective film on the seventh optical side, higher optical performance can be obtained, thereby improving the imaging quality of the augmented reality optical system. Furthermore, under the condition of satisfying the above-mentioned conditions, the augmented reality optical system can have a smaller size, thus achieving miniaturization. [Attached Image Description] Figure 1 A schematic diagram of the structure of the eyebox center under 0D refractive power in the first embodiment of the present invention; Figure 2 A dot array diagram of the center of the eyebox under 0D refractive power, as provided in the first embodiment of the present invention; Figure 3 A schematic diagram of field curvature and distortion at the center of the eyebox under 0D refractive power, provided by the first embodiment of the present invention; Figure 4 A schematic diagram of the magnification chromatic aberration at the center of the eyebox under 0D diopter, provided by the first embodiment of the present invention; Figure 5 A schematic diagram of the structure of the eyebox edge at +3.5 and -1.5 under 0D refractive power according to the first embodiment of the present invention; Figure 6 The first embodiment of the present invention provides a dot array diagram of the eyebox edge at +3.5 and -1.5 under 0D refractive power; Figure 7 A schematic diagram of field curvature and distortion at +3.5 and -1.5 at the eyebox edge under 0D refractive power, according to the first embodiment of the present invention; Figure 8 A schematic diagram of the color difference at magnifications of +3.5 and -1.5 at the edge of the eyebox under 0D diopter according to the first embodiment of the present invention; Figure 9 A schematic diagram of the structure of the eyebox center under -6D diopter according to the first embodiment of the present invention; Figure 10 A dot array diagram of the eyebox center under -6D refractive power, as provided in the first embodiment of the present invention; Figure 11A schematic diagram of the field curvature and distortion at the center of the eyebox under -6D refractive power, provided for the first embodiment of the present invention; Figure 12 A schematic diagram of the magnification chromatic aberration at the center of the eyebox under -6D diopter, provided by the first embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of the eyebox center under 0D refractive power according to the second embodiment of the present invention; Figure 14 A dot array diagram of the center of the eyebox under 0D refractive power, as provided in the second embodiment of the present invention; Figure 15 This is a schematic diagram of the field curvature and distortion at the center of the eyebox under 0D refractive power, provided by the second embodiment of the present invention. Figure 16 This is a schematic diagram of the magnification chromatic aberration at the center of the eyebox under 0D diopter, according to the second embodiment of the present invention. Figure 17 A schematic diagram of the structure of the eyebox edge at +3.5 and -1.5 under 0D refractive power according to the second embodiment of the present invention; Figure 18 The second embodiment of the present invention is a dot array diagram of the eyebox edge at +3.5 and -1.5 under 0D refractive power; Figure 19 A schematic diagram of field curvature and distortion at +3.5 and -1.5 at the eyebox edge under 0D refractive power, according to the second embodiment of the present invention; Figure 20 A schematic diagram of the color difference at magnifications of +3.5 and -1.5 at the edge of the eyebox under 0D diopter according to the second embodiment of the present invention; Figure 21 This is a schematic diagram of the structure of the eyebox center under -6D diopter according to the second embodiment of the present invention; Figure 22 A dot array diagram of the eyebox center under -6D diopter, as provided in the second embodiment of the present invention; Figure 23 A schematic diagram of the field curvature and distortion at the center of the eyebox under -6D refractive power, provided by the second embodiment of the present invention; Figure 24 This is a schematic diagram of the magnification chromatic aberration at the center of the eyebox under -6D diopter, according to the second embodiment of the present invention. Figure 25 A schematic diagram of the structure of the eyebox center under 0D refractive power in the third embodiment of the present invention; Figure 26The dot array diagram of the eyebox center under 0D refractive power provided by the third embodiment of the present invention; Figure 27 A schematic diagram of the field curvature and distortion at the center of the eyebox under 0D refractive power, provided by the third embodiment of the present invention; Figure 28 A schematic diagram of the magnification chromatic aberration at the center of the eyebox under 0D diopter, provided by the third embodiment of the present invention; Figure 29 A schematic diagram of the structure of the eyebox edge at +3.5 and -1.5 under 0D refractive power in the third embodiment of the present invention; Figure 30 The third embodiment of the present invention provides a dot array diagram of the eyebox edge at +3.5 and -1.5 under 0D refractive power; Figure 31 A schematic diagram of field curvature and distortion at +3.5 and -1.5 at the eyebox edge under 0D refractive power, according to the third embodiment of the present invention; Figure 32 A schematic diagram of the color difference at magnifications of +3.5 and -1.5 at the edge of the eyebox under 0D diopter according to the third embodiment of the present invention; Figure 33 A schematic diagram of the structure of the eyebox center under -6D diopter according to the third embodiment of the present invention; Figure 34 A dot array diagram of the eyebox center under -6D diopter, as provided in the third embodiment of the present invention; Figure 35 A schematic diagram of the field curvature and distortion at the center of the eyebox under -6D refractive power, provided for the third embodiment of the present invention; Figure 36 A schematic diagram of the magnification chromatic aberration at the center of the eyebox under -6D diopter, provided by the third embodiment of the present invention; Figure 37 A schematic diagram of the structure of the eyebox center under 0D refractive power in the fourth embodiment of the present invention; Figure 38 The fourth embodiment of the present invention is a dot array diagram of the center of the eyebox under 0D refractive power; Figure 39 A schematic diagram of the field curvature and distortion at the center of the eyebox under 0D refractive power, provided by the fourth embodiment of the present invention; Figure 40 This is a schematic diagram of the magnification chromatic aberration at the center of the eyebox under 0D diopter, provided by the fourth embodiment of the present invention. Figure 41A schematic diagram of the structure of the eyebox edge at +3.5 and -1.5 under 0D refractive power according to the fourth embodiment of the present invention; Figure 42 The fourth embodiment of the present invention provides a dot array diagram of the eyebox edge at +3.5 and -1.5 under 0D refractive power; Figure 43 A schematic diagram of field curvature and distortion at +3.5 and -1.5 at the eyebox edge under 0D refractive power according to the fourth embodiment of the present invention; Figure 44 A schematic diagram of the color difference at magnifications of +3.5 and -1.5 at the edge of the eyebox under 0D diopter according to the fourth embodiment of the present invention; Figure 45 A schematic diagram showing the assembly of the composite film and the second lens, the quarter-wave plate and the third lens, and the semi-transparent and semi-reflective film and the third lens provided by the present invention. Figure 46 A schematic diagram showing the dimensional relationship of the rectangular eye box provided by the present invention.

Detailed Implementation Methods

[0015] The present invention provides an augmented reality device, including an augmented reality optical system 100, wherein the augmented reality device can be AR smart glasses.

[0016] Please see Figure 1 , Figure 5 , Figure 9 , Figure 13 , Figure 17 , Figure 21 , Figure 25 , Figure 29 , Figure 33 , Figure 37 , Figure 41 ,as well as Figure 45The augmented reality optical system 100 includes a receiver 5, a lens group 10, and an image display 4 arranged sequentially from the light-emitting side to the light-receiving side. The lens group 10 includes a first lens 1, a second lens 2, and a third lens 3 arranged sequentially from the light-emitting side to the light-receiving side. The first lens 1 has a first optical side 11 and a second optical side 12 arranged opposite to each other. The second lens 2 has a third optical side 21, a fourth optical side 22, and a fifth optical side 23 connected in sequence. The third lens 3 has a sixth optical side 31 and a seventh optical side 32 arranged opposite to each other. The third optical side 21 is arranged opposite to the second optical side 12, and the fourth optical side 22 is arranged opposite to the sixth optical side 31. The image display 4 is positioned opposite the fifth optical side 23, and the receiver 5 is positioned opposite the first optical side 11. The light beam emitted by the image display 4 passes sequentially through the fifth optical side 23, the fourth optical side 22, the third optical side 21, the fourth optical side 22, the sixth optical side 31, the seventh optical side 32, the sixth optical side 31, the fourth optical side 22, the third optical side 21, the second optical side 12, and the first optical side 11, and is received by the receiver 5. Wherein, as... Figure 45 As shown, a composite film CM is disposed on the third optical side 21, the composite film CM including a first polarizing film (not shown in the figure) and a polarizing reflection film (not shown in the figure); a quarter-wave plate QWP is disposed on the sixth optical side 31; a semi-transparent and semi-reflective film BS is disposed on the seventh optical side 32; the augmented reality optical system 100 satisfies the following condition: 0.20≤TD / TTL≤0.26; Wherein, TD is the on-axis distance from the first optical side 11 to the seventh optical side 32; TTL represents the total optical length of the augmented reality optical system 100, that is, the distance the central ray travels along the optical axis from the receiver 5 to the image display 4.

[0017] By designing a three-piece optical path folding structure with the first lens 1, the second lens 2, and the third lens 3 working together, and by setting a first polarizing film and a polarizing reflection film on the third optical side 21 of the second lens 2, and a quarter-wave plate (QWP) on the sixth optical side and a semi-transparent and semi-reflective film (BS) on the seventh optical side of the third lens 3, higher optical performance can be obtained, thereby improving the imaging quality of the augmented reality optical system 100. Furthermore, under the aforementioned conditions, the augmented reality optical system 100 can be made to have a smaller size, thus achieving miniaturization.

[0018] It should be noted that the first polarizing film can convert the natural light emitted by the image display 4 into linearly polarized light of a specific direction before it enters the subsequent optical system, avoiding crosstalk from non-target polarized light, ensuring image clarity, achieving higher optical performance, and improving the contrast of the virtual image. The polarizing reflective film can maintain a high reflectivity, thereby maximizing the retention of light energy of the virtual image in low-light environments, improving the brightness of the virtual image, and making the augmented reality optical system 100 more clearly visible in dim environments; moreover, the polarizing reflective film allows polarized light of a certain direction to pass through while reflecting polarized light perpendicular to it. In the pancake (folded light path) path, it selectively reflects light of different polarization states to achieve "folding" of the light path inside the lens. The quarter-wave plate (QWP) can precisely control the polarization state to ensure that image light enters the human eye efficiently. The semi-transparent and semi-reflective film (BS) can simultaneously achieve partial light reflection and partial light transmission, completing the "enhancement" superposition, and can also reduce the size and thickness of the lens.

[0019] In the technical solution of this invention, the first lens 1 and the second lens 2 can be prisms, and the third lens 3 can be a biconvex lens. The first lens 1, the second lens 2, and the third lens 3 are all made of plastic. It should be noted that each lens can also be made of other materials.

[0020] In the technical solution of the present invention, the augmented reality optical system 100 satisfies the following conditional expression: 55mm≤TTL≤70mm. Within this conditional range, it is beneficial to achieve ultra-thinness in the augmented reality optical system 100.

[0021] In the technical solution of the present invention, the augmented reality optical system 100 satisfies the following conditional expression: 45°≤FOV≤56°; Here, FOV represents the field of view of the augmented reality optical system 100. Within this conditional range, the field of view of the augmented reality optical system 100 can be kept from being too small, ensuring a better field of view.

[0022] In the technical solution of the present invention, the augmented reality optical system 100 satisfies the following conditional expression: eye relief ≥ 18mm; Here, eyerelief represents the distance between receiver 5 and the first optical side 11. This allows for a shorter overall system length while maintaining eye comfort, which is beneficial for miniaturization. Preferably, 18mm ≤ eyerelief ≤ 19mm.

[0023] It should be noted that other mechanical structures may be placed between the receiver 5 and the first lens 1.

[0024] In the technical solution of this invention, the reflectivity of the polarizing reflective film is greater than or equal to 95%, such as 95%, 96%, 97%, 98%, etc.; the reflectivity of the semi-transparent and semi-reflective film BS ranges from 40% to 60%, such as 40%, 45%, 50%, 60%, etc., and the transmittance of the semi-transparent and semi-reflective film BS ranges from 40% to 60%, such as 40%, 45%, 50%, 60%, etc. Thus, the polarizing reflective film can maintain a high reflectivity, thereby maximizing the retention of light energy of the virtual image in low-light environments, improving the brightness of the virtual image, and making it more clearly visible in dim environments.

[0025] In the technical solution of this invention, the first optical side 11 is an aspherical or planar surface, and the sixth optical side 31 is an aspherical or planar surface. This facilitates reducing the overall optical length of the optical system and correcting aberrations; furthermore, it allows for an increase in the size of the image display 4, expanding its application range.

[0026] In the technical solution of this invention, the lens group 10 further includes a fourth lens 6, which is disposed between the image display 4 and the second lens 2. The fourth lens 6 is a plastic lens. This balances aberrations and increases sharpness. The fourth lens 6 can be an aspherical lens.

[0027] In the technical solution of the present invention, a second polarizing film 7 is provided on the side of the image display 4 near the fifth optical side 23. The second polarizing film 7 can convert the light emitted by the image display 4 into polarized light, and the second polarizing film 7 can eliminate ghosting when combined with a quarter-wave plate (QWP).

[0028] Depending on the actual needs, the image display 4 can be a display screen, such as a 0.68-inch OLED, and the second polarizing film 7 can convert the light emitted by the image display 4 into left-handed circularly polarized light LCP.

[0029] In the technical solution of this invention, the image display 4 can move relative to the fifth optical side 23 along the optical axis to adjust the diopter of the augmented reality optical system 100, with the diopter adjustment range being -6D to 0D. Thus, by moving the image display 4, the distance between it and the second lens 2 can be changed, thereby changing the distance between the image display 4 and the optical components in the augmented reality optical system 100, achieving adjustment under different diopter conditions. This is compatible with nearsighted users, allowing them to have a good experience wearing the head-mounted AR device.

[0030] In the technical solution of this invention, the receiver 5 is a rectangular eye box. The dimensions of the rectangular eye box in the X direction satisfy: EyeboxX = EPD + |EyeshiftX| × 2, and the dimensions of the rectangular eye box in the Y direction satisfy: EyeboxY = EPD + |EyeshiftY| × 2. In this invention, as... Figure 46As shown, the center of the stop is the reference point. The stop simulates the position of the human eye, and its diameter EPD = 4.00 mm. The maximum unidirectional eye movement distance of the human eye in the X direction, with the center of the stop as the reference, is EyeshiftX = 3.5 mm (i.e., the bidirectional eye movement range in the X direction is ±3.5 mm), and the maximum unidirectional eye movement distance in the Y direction is EyeshiftY = 1.5 mm (i.e., the bidirectional eye movement range in the Y direction is ±1.5 mm). In this invention, the eye box size is 11 mm × 7 mm.

[0031] In the technical solution of the present invention, the third lens 3 has positive optical power, the light-emitting side of the third lens 3 is convex at the paraxial position, the light-incident side of the third lens 3 is convex at the paraxial position, and the augmented reality optical system also satisfies the following condition: 1.05 ≤ f3 / f ≤ 1.15; where f represents the focal length of the augmented reality optical system, and f3 represents the focal length of the third lens 3. Within this conditional range, the outgoing light from the third lens 3 is nearly parallel light, which can match the natural focusing of the human eye.

[0032] 0.052≤d6 / TTL≤0.072; where d6 represents the on-axis thickness of the third lens 3. Within this conditional range, the thickness of the third lens 3 is relatively thin, which can eliminate the feeling of pressure when wearing it and is beneficial to the miniaturization of the optical system.

[0033] In the technical solution of the present invention, the augmented reality optical system satisfies the following conditional expression: 0.99≤SD4 / SD6≤1.06; where SD4 represents the aperture of the fourth optical side 22, and SD6 represents the aperture of the sixth optical side 31. Aperture refers to the height in the X direction. Within this conditional range, the aperture sizes of adjacent surfaces can be reasonably set, which helps the light to transition smoothly under different eye shifts, resulting in better imaging quality for the system.

[0034] In the technical solution of this invention, the first lens 1 and the second lens 2 are bonded and fixed, while the second lens 1 and the third lens 3 are separated. Thus, the first lens 1 and the second lens 2 are bonded together to form a cemented lens, which can accurately correct aberrations and improve image quality.

[0035] The augmented reality optical system 100 of the present invention will be illustrated below with examples.

[0036] (First Implementation) Table 1 shows some design data for the augmented reality optical system 100 according to the first embodiment of the present invention.

[0037] Table 1

[0038] The meanings of each symbol are as follows: STOP: Aperture stop; where STOP is the position of the eye, STOP represents the "observation window" of the system; the light path is most complete when the pupil of the human eye coincides with this STOP (exit pupil); S1: First optical side 11; S2: Second optical side 12; S3: Third optical side 21; S4: Fourth optical side 22; S5: Fifth optical side 23; S6: Sixth optical side 31; S7: Seventh optical side 32; S8: Object side of the second polarizing film 7; S9: Image side of image display 4; R: Radius of curvature at the center of the optical side; d: Axial thickness of the lens, axial distance between lenses; d0: The position where the system forms a virtual image; d1: The on-axis distance between receiver 5 and the first optical side 11; d2: On-axis thickness of the first lens 1; d3: Axial thickness of the composite membrane CM; d4: On-axis thickness of the second lens 2; d5: The on-axis distance between the fourth optical side 22 and the sixth optical side 31; d6: On-axis thickness of the third lens 3; d7: The on-axis distance between the fourth optical side 22 and the fifth optical side 23; d8: The on-axis distance between the fifth optical side 23 and the second polarizing film 7; d9: On-axis thickness of the second polarizing film 7; d10: On-axis thickness of image display 4; nd: Refractive index of the d-line; nd1: Refractive index of the first lens 1; nd2: Refractive index of the second lens 2; nd3: Refractive index of the third lens 3; ndf: Refractive index of the composite film CM; ndp: Refractive index of the second polarizing film 7; ng: The refractive index of the image display 4; vd: Abbe number; v1: Abbe number of the first lens 1; v2: Abbe number of the second lens 2; v3: Abbe number of the third lens 3; vf: Abbe number of the composite membrane CM; vp: Abbe number of the second polarizing film 7; vg: Abbe number of image display 4.

[0039] Table 2 shows the aspherical data of each lens in the augmented reality optical system 100 of the first embodiment of the present invention.

[0040] Table 2

[0041] For convenience, the aspherical surfaces of each lens surface are those shown in the following formula. However, the present invention is not limited to the aspherical polynomial form expressed by this formula.

[0042] ; Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, and A16 are aspheric coefficients, c is the curvature at the optical side center, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and the tangent plane at the vertex of the aspheric optical axis).

[0043] Table 3 shows another part of the design data for the augmented reality optical system 100 of the first embodiment of the present invention.

[0044] Table 3

[0045] The meanings of each symbol are as follows: f: Focal length of augmented reality optical system 100; f3: Focal length of the third lens 3; FOV: Field of view of Augmented Reality Optics System 100; TD: The total thickness of the first lens 1, the second lens 2, and the third lens 3; TTL: Total optical length of Augmented Reality Optical System 100.

[0046] Table 4 shows the data for d0 and d9 at different diopters in the augmented reality optical system 100 according to the first embodiment of the present invention.

[0047] Table 4

[0048] In this embodiment, the system parameters and performance are as follows: Please refer to Figure 2 , Figure 6 and Figure 10 , Figure 2 This is a dot array diagram of the center of the eyebox under 0D refractive power. Figure 6 This is a dot array diagram of the eyebox edges at +3.5 and -1.5 diopters under 0D refractive power. Figure 10 This is a dot array diagram of the center of the eyebox at -6D diopter. As can be seen from the diagram, the maximum value of the image points in the dot array diagram of the augmented reality optical system 100 is relatively small across the entire field of view, resulting in clear imaging.

[0049] It should be noted that "eyebox edge +3.5, -1.5" means that the EPD is moved to a position of +x3.5cm, -y1.5cm, and the +z direction is the optical axis direction.

[0050] Please refer to Figure 3 , Figure 7 and Figure 11 , Figure 3 This is a schematic diagram of field curvature and distortion at the center of the eyebox under 0D refractive power. Figure 7 This is a schematic diagram of field curvature and distortion at the eyebox edge at +3.5 and -1.5 diopters under 0D refractive power. Figure 11 This is a schematic diagram of the field curvature and distortion at the center of the eyebox under -6D refractive power; among which... Figure 3 , Figure 7 and Figure 11 The left image shows a field curvature diagram, where the horizontal axis represents the field curvature value in millimeters and the vertical axis represents the field of view in degrees. The right image shows a distortion diagram, where the horizontal axis represents the distortion rate as a percentage and the vertical axis represents the field of view in degrees. As can be seen from the images, the maximum field curvature does not exceed 0.4 mm, and the distortion is no greater than 6%, indicating relatively small field curvature and distortion. Field curvature and distortion reflect the differences in the position of the sharp imaging plane at different fields of view.

[0051] Please see Figure 4 , Figure 8 and Figure 12 , Figure 4 This is a schematic diagram of the chromatic aberration at the center of the eyebox under 0D diopter. Figure 8 This is a schematic diagram showing the color difference at the eyebox edge at magnifications of +3.5 and -1.5 under 0D diopter. Figure 12 This is a schematic diagram of the chromatic aberration at the center of the eyebox under -6D diopter; where... Figure 4 , Figure 8 and Figure 12The horizontal axis represents the chromatic aberration difference at magnification, in micrometers, and the vertical axis represents the image height, in millimeters. As can be seen from the figure, the maximum chromatic aberration at magnification is less than 80 μm, indicating small field-of-view chromatic aberration and clear, accurate imaging. Chromatic aberration reflects the difference in the imaging position of different wavelengths of light at different fields of view on the image plane.

[0052] In this embodiment, the entrance pupil diameter (ENPD) of the augmented reality optical system 100 is 10.0 mm, which can be adjusted from 0D to 6D diopter, making it compatible with myopic users and allowing them to have a good experience when wearing the head-mounted AR device.

[0053] (Second Implementation) Table 5 shows some design data for the augmented reality optical system 100 according to the second embodiment of the present invention.

[0054] Table 5

[0055] Table 6 shows the aspherical data of each lens in the augmented reality optical system 100 according to the second embodiment of the present invention.

[0056] Table 6

[0057] Table 7 shows another part of the design data for the augmented reality optical system 100 according to the second embodiment of the present invention.

[0058] Table 7

[0059] Table 8 shows the data for d0 and d9 at different diopters in the augmented reality optical system 100 according to the second embodiment of the present invention.

[0060] Table 8

[0061] In this embodiment, the system parameters and performance are as follows: Please refer to Figure 14 , Figure 18 and Figure 22 , Figure 14 This is a dot array diagram of the center of the eyebox under 0D refractive power. Figure 18 This is a dot array diagram of the eyebox edges at +3.5 and -1.5 diopters under 0D refractive power. Figure 22 This is a dot array diagram of the center of the eyebox at -6D diopter. As can be seen from the diagram, the maximum value of the image points in the dot array diagram of the augmented reality optical system 100 is relatively small across the entire field of view, resulting in clear imaging.

[0062] Please refer to Figure 15 , Figure 19 and Figure 23 , Figure 15 This is a schematic diagram of field curvature and distortion at the center of the eyebox under 0D refractive power. Figure 19 This is a schematic diagram of field curvature and distortion at the eyebox edge at +3.5 and -1.5 diopters under 0D refractive power. Figure 23 This is a schematic diagram of the field curvature and distortion at the center of the eyebox under -6D refractive power; among which... Figure 15 , Figure 19 and Figure 23 The left image is a schematic diagram of field curvature, where the horizontal axis represents the field curvature value in millimeters and the vertical axis represents the field of view in degrees. The right image is a schematic diagram of distortion, where the horizontal axis represents the distortion rate as a percentage and the vertical axis represents the field of view in degrees. As can be seen from the images, the maximum field curvature does not exceed 0.3 mm, and the distortion is no greater than 8%, indicating relatively small field curvature and distortion.

[0063] Please see Figure 16 , Figure 20 and Figure 24 , Figure 16 This is a schematic diagram of the chromatic aberration at the center of the eyebox under 0D diopter. Figure 20 This is a schematic diagram showing the color difference at the eyebox edge at magnifications of +3.5 and -1.5 under 0D diopter. Figure 24 This is a schematic diagram of the chromatic aberration at the center of the eyebox under -6D diopter; where... Figure 16 , Figure 20 and Figure 24 The horizontal axis represents the chromatic aberration difference in micrometers, and the vertical axis represents the image height in millimeters. As can be seen from the figure, the maximum field-of-view chromatic aberration is less than 50 μm, indicating low field-of-view chromatic aberration and clear, accurate imaging.

[0064] In this embodiment, the entrance pupil diameter (ENPD) of the augmented reality optical system 100 is 10.0 mm, which can be adjusted from 0D to 6D diopter, making it compatible with myopic users and allowing them to have a good experience when wearing the head-mounted AR device.

[0065] (Third implementation method) Table 9 shows some design data for the augmented reality optical system 100 according to the third embodiment of the present invention.

[0066] Table 9

[0067] Table 10 shows the aspherical data of each lens in the augmented reality optical system 100 according to the third embodiment of the present invention.

[0068] Table 10

[0069] Table 11 shows another part of the design data for the augmented reality optical system 100 according to the third embodiment of the present invention.

[0070] Table 11

[0071] Table 12 shows the data for d0 and d9 at different diopters in the augmented reality optical system 100 according to the third embodiment of the present invention.

[0072] Table 12

[0073] In this embodiment, the system parameters and performance are as follows: Please refer to Figure 26 , Figure 30 and Figure 34 , Figure 26 This is a dot array diagram of the center of the eyebox under 0D refractive power. Figure 30 This is a dot array diagram of the eyebox edges at +3.5 and -1.5 diopters under 0D refractive power. Figure 34 This is a dot array diagram of the center of the eyebox at -6D diopter. As can be seen from the diagram, the maximum value of the image points in the dot array diagram of the augmented reality optical system 100 is relatively small across the entire field of view, resulting in clear imaging.

[0074] Please refer to Figure 27 , Figure 31 and Figure 35 , Figure 27 This is a schematic diagram of field curvature and distortion at the center of the eyebox under 0D refractive power. Figure 31 This is a schematic diagram of field curvature and distortion at the eyebox edge at +3.5 and -1.5 diopters under 0D refractive power. Figure 35 This is a schematic diagram of the field curvature and distortion at the center of the eyebox under -6D refractive power; among which... Figure 27 , Figure 31 and Figure 35 The left image shows a field curvature diagram, where the horizontal axis represents the field curvature value in millimeters and the vertical axis represents the field of view in degrees. The right image shows a distortion diagram, where the horizontal axis represents the distortion rate as a percentage and the vertical axis represents the field of view in degrees. As can be seen from the images, the maximum field curvature does not exceed 0.3 mm, and the distortion is no greater than 1.2%, indicating relatively small field curvature and distortion.

[0075] Please see Figure 28 , Figure 32 and Figure 36 , Figure 28 This is a schematic diagram of the chromatic aberration at the center of the eyebox under 0D diopter. Figure 32 This is a schematic diagram showing the color difference at the eyebox edge at magnifications of +3.5 and -1.5 under 0D diopter. Figure 36 This is a schematic diagram of the chromatic aberration at the center of the eyebox under -6D diopter; where... Figure 28 , Figure 32 and Figure 36 The horizontal axis represents the chromatic aberration difference in micrometers, and the vertical axis represents the image height in millimeters. As can be seen from the figure, the maximum field-of-view chromatic aberration is less than 50 μm, indicating low field-of-view chromatic aberration and clear, accurate imaging.

[0076] In this embodiment, the entrance pupil diameter (ENPD) of the augmented reality optical system 100 is 10.0 mm, which can be adjusted from 0D to 6D diopter, making it compatible with myopic users and allowing them to have a good experience when wearing the head-mounted AR device.

[0077] (Fourth Implementation) Table 13 shows some design data for the augmented reality optical system 100 according to the fourth embodiment of the present invention.

[0078] Table 13

[0079] The meanings of each symbol are as follows: S10: The light-emitting side of the fourth lens 6; S11: The incident light side of the fourth lens 6; d11: On-axis thickness of the fourth lens 6; d12: The on-axis distance between the fourth lens 6 and the second polarizing film 7; nd4: Refractive index of the fourth lens 6; v4: Abbe number of the fourth lens 6.

[0080] Table 14 shows the aspherical data of each lens in the augmented reality optical system 100 according to the fourth embodiment of the present invention.

[0081] Table 14

[0082] Table 15 shows another portion of the design data for the augmented reality optical system 100 according to the fourth embodiment of the present invention.

[0083] Table 15

[0084] In this embodiment, the system parameters and performance are as follows: Please refer to Figure 38 and Figure 42 , Figure 38This is a dot array diagram of the center of the eyebox under 0D refractive power. Figure 42 This is a dot array diagram of the eyebox edges at +3.5 and -1.5 diopters under 0D diopter. As can be seen from the diagram, across the entire field of view, the maximum value of the image points in the dot array diagram of the augmented reality optical system 100 is relatively small, resulting in clear imaging.

[0085] Please refer to Figure 39 and Figure 43 , Figure 39 This is a schematic diagram of field curvature and distortion at the center of the eyebox under 0D refractive power. Figure 43 This is a schematic diagram of field curvature and distortion at +3.5 and -1.5 at the eyebox edge under 0D refractive power; among which, Figure 39 and Figure 43 The left image shows a field curvature diagram, where the horizontal axis represents the field curvature value in millimeters and the vertical axis represents the field of view in degrees. The right image shows a distortion diagram, where the horizontal axis represents the distortion rate as a percentage and the vertical axis represents the field of view in degrees. As can be seen from the images, the maximum field curvature does not exceed 0.3 mm, and the distortion is no greater than 6%, indicating relatively small field curvature and distortion.

[0086] Please see Figure 40 and Figure 44 , Figure 40 This is a schematic diagram of the chromatic aberration at the center of the eyebox under 0D diopter. Figure 44 This is a schematic diagram of color difference at the eyebox edge with magnifications of +3.5 and -1.5 at 0D diopter; where, Figure 40 and Figure 44 The horizontal axis represents the chromatic aberration difference in micrometers, and the vertical axis represents the image height in millimeters. As can be seen from the figure, the maximum field-of-view chromatic aberration is less than 80 μm, indicating low field-of-view chromatic aberration and clear, accurate imaging.

[0087] The above are merely embodiments of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. An augmented reality optical system, characterized in that, The augmented reality optical system includes a receiver, a lens group, and an image display arranged sequentially from the light-emitting side to the light-receiving side. The lens group includes a first lens, a second lens, and a third lens arranged sequentially from the light-emitting side to the light-receiving side. The first lens has a first optical side and a second optical side that are oppositely distributed. The second lens has a third optical side, a fourth optical side, and a fifth optical side that are connected in sequence. The third lens has a sixth optical side and a seventh optical side that are oppositely distributed. The third optical side is positioned opposite to the second optical side, and the fourth optical side is positioned opposite to the sixth optical side. The image display is positioned opposite to the fifth optical side, and the receiver is positioned opposite to the first optical side. The light beam emitted by the image display passes sequentially through the fifth optical side, the fourth optical side, the third optical side, the fourth optical side, the sixth optical side, the seventh optical side, the sixth optical side, the fourth optical side, the third optical side, the second optical side, and the first optical side, and is received by the receiver. The third optical side is provided with a composite film, which includes a first polarizing film and a polarizing reflection film; the sixth optical side is provided with a quarter-wave plate; the seventh optical side is provided with a semi-transparent and semi-reflective film; the augmented reality optical system satisfies the following condition: 0.20≤TD / TTL≤0.26; Wherein, TD is the on-axis distance from the first optical side to the seventh optical side, and TTL represents the total optical length of the augmented reality optical system.

2. The augmented reality optical system according to claim 1, characterized in that, The augmented reality optical system satisfies the following condition: 55mm≤TTL≤70mm.

3. The augmented reality optical system according to claim 1, characterized in that, The augmented reality optical system satisfies the following condition: 45°≤FOV≤56°; Wherein, FOV represents the field of view of the augmented reality optical system.

4. The augmented reality optical system according to claim 1, characterized in that, The augmented reality optical system satisfies the following condition: eye relief ≥ 18mm; Wherein, eyerelief refers to the distance between the receiver and the first optical side.

5. The augmented reality optical system according to claim 1, characterized in that, The image display can be moved relative to the fifth optical side along the optical axis to adjust the diopter of the augmented reality optical system, the diopter adjustment range being -6D to 0D.

6. The augmented reality optical system according to claim 1, characterized in that, The polarizing reflective film has a reflectivity greater than or equal to 95%, the reflectivity of the semi-transparent and semi-reflective film ranges from 40% to 60%, and the transmittance of the semi-transparent and semi-reflective film ranges from 40% to 60%.

7. The augmented reality optical system according to claim 1, characterized in that, The first optical side is an aspherical surface or a plane, and the sixth optical side is an aspherical surface or a plane.

8. The augmented reality optical system according to claim 1, characterized in that, The lens group further includes a fourth lens, which is disposed between the image display and the second lens, and the fourth lens is a plastic lens.

9. The augmented reality optical system according to claim 1, characterized in that, The image display has a second polarizing film disposed on the side closest to the fifth optical side.

10. The augmented reality optical system according to claim 1, characterized in that, The third lens has positive optical power, the light-emitting side of the third lens is convex at the paraxial position, the light-incident side of the third lens is convex at the paraxial position, and the augmented reality optical system also satisfies the following condition: 1.05≤f³ / f≤1.15; 0.052≤d6 / TTL≤0.072; Wherein, f represents the focal length of the augmented reality optical system, f3 represents the focal length of the third lens, and d6 represents the on-axis thickness of the third lens.

11. The augmented reality optical system according to claim 1, characterized in that, The augmented reality optical system satisfies the following condition: 0.99≤SD4 / SD6≤1.06; Wherein, SD4 represents the aperture of the fourth optical side, and SD6 represents the aperture of the sixth optical side.

12. The augmented reality optical system according to claim 1, characterized in that, The first lens and the second lens are bonded and fixed together.

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