Eyepiece optical system

Abstract

The invention provides an eyepiece optical system. The eyepiece optical system is configured to enable imaging light from a display picture to enter eyes of an observer through the eyepiece optical system so as to form an image. The eyepiece optical system sequentially comprises a first lens and a second lens from the eye side to the display side along the optical axis. The eyepiece optical system further comprises a linear polarizing film, a reflective polarizing film, a quarter-wavelength sheet and a partial reflector. The quarter-wavelength sheet is arranged on the reflective polarizing film, the reflective polarizing film is arranged on the linear polarizing film, and the linear polarizing film is arranged on the plane of the optical axis area of the display side face of the first lens. The optical axis area of the eye side surface of the second lens is a convex surface.

Description

Technical Field

[0001] The invention relates to an optical system, in particular to an eyepiece optical system. Background Art

[0002] The eyepiece optical systems currently used in VR on the market can be mainly divided into three categories: aspherical optical components, Fresnel optical components and pancake optical components. The advantages of aspherical optical components are low manufacturing costs and fewer stray light problems such as flare and ghost, but they are heavy and large in size. The advantages of Fresnel optical components are light weight and improved half-viewing angle, but the manufacturing cost is higher than that of aspherical optical components, and the disadvantage is that there is a more serious flare problem. The advantage of pancake optical components is that the weight and volume can be less than half of aspherical optical components, and there is no flare problem. However, since the cost of optical film materials is half of the cost of the lens, and the film-mounting process and assembly precision and calibration are difficult, the manufacturing cost is about 10 to 40 times that of aspherical optical components, and there is a problem of ghosting.

[0003] Based on the above, the lightweight advantage of biscuit optical components makes it the mainstream of the current industry development, but the production yield is low and the cost is high, so how to solve the above problems is one of the research and development directions of the industry. In addition, how to increase the half-angle of view, make the eyepiece optical system lightweight and improve the imaging quality, the above problems still need to be improved. Summary of the invention

[0004] The present invention provides an eyepiece optical system, which not only meets consumers' demands for image quality and magnification, but also can reduce the weight and volume of the eyepiece optical system and further reduce the production cost of the eyepiece optical system.

[0005] The present invention provides an eyepiece optical system, which is configured to allow imaging light from a display screen to enter the observer's eyes through the eyepiece optical system to form an image, wherein the side facing the eye is the eye side and the side facing the display screen is the display side. The eyepiece optical system includes a first lens and a second lens in sequence along an optical axis from the eye side to the display side. The first lens to the second lens each include an eye side surface facing the eye side and allowing the imaging light to pass through, and a display side surface facing the display side and allowing the imaging light to pass through. The eyepiece optical system also includes a linear polarization film, a reflective polarization film, a quarter-wave plate and a partial reflector. The quarter-wave plate is arranged on the reflective polarization film, the reflective polarization film is arranged on the linear polarization film, and the linear polarization film is arranged on a plane in an optical axis area of ​​the display side of the first lens. An optical axis area of ​​the eye side surface of the second lens is a convex surface. The eyepiece optical system satisfies the following conditional formulas: TTL / BFL≤8.200 and ImgH / (T1+G12)≥2.900, wherein TTL is the distance from the eyepiece side of the first lens to the display screen on the optical axis, BFL is the distance from the display side of the second lens to the display screen on the optical axis, ImgH is the maximum image height of the eyepiece optical system, T1 is the thickness of the first lens on the optical axis, and G12 is the distance from the display side of the first lens to the eyepiece side of the second lens on the optical axis.

[0006] The present invention further provides an eyepiece optical system, which is configured to allow imaging light from a display screen to pass through the eyepiece optical system and enter the observer's eye to form an image, wherein the side facing the eye is the eye side and the side facing the display screen is the display side. The eyepiece optical system includes a first lens and a second lens in sequence along an optical axis from the eye side to the display side. The first lens to the second lens each include an eye side surface facing the eye side and allowing the imaging light to pass through, and a display side surface facing the display side and allowing the imaging light to pass through. The eyepiece optical system also includes a linear polarization film, a reflective polarization film, a quarter-wave plate and a partial reflector. The quarter-wave plate is disposed on the reflective polarization film, the reflective polarization film is disposed on the linear polarization film, and the linear polarization film is disposed on a plane in an optical axis area of ​​the display side surface of the first lens. An optical axis area of ​​the eye side surface of the second lens is a convex surface. The eyepiece optical system satisfies the following conditional formulas: 2.100≤TTL / BFL≤8.200 and (ImgH+BFL) / (T1+G12)≥3.200, wherein TTL is the distance from the eyepiece side of the first lens to the display screen on the optical axis, BFL is the distance from the display side of the second lens to the display screen on the optical axis, ImgH is the maximum image height of the eyepiece optical system, T1 is the thickness of the first lens on the optical axis, and G12 is the distance from the display side of the first lens to the eyepiece side of the second lens on the optical axis.

[0007] The present invention further provides an eyepiece optical system, which is configured to allow imaging light from a display screen to pass through the eyepiece optical system and enter the observer's eye to form an image, wherein the side facing the eye is the eye side and the side facing the display screen is the display side. The eyepiece optical system includes a first lens and a second lens in sequence along an optical axis from the eye side to the display side. The first lens to the second lens each include an eye side surface facing the eye side and allowing the imaging light to pass through, and a display side surface facing the display side and allowing the imaging light to pass through. The eyepiece optical system also includes a linear polarizing film, a reflective polarizing film, a quarter-wave plate, and a partial reflector. An optical axis region of the display side surface of the first lens is a plane. An optical axis region of the eye side surface of the second lens is a convex surface, and a circumferential region of the eye side surface of the second lens is a concave surface. The eyepiece optical system satisfies the following conditional formula: (ImgH+BFL) / (T1+G12)≥3.500, where ImgH is the maximum image height of the eyepiece optical system, BFL is the distance from the display side of the second lens to the display screen on the optical axis, T1 is the thickness of the first lens on the optical axis, and G12 is the distance from the display side of the first lens to the eye side of the second lens on the optical axis.

[0008] Based on the above, the beneficial effects of the eyepiece optical system of the embodiment of the present invention are: by satisfying the optical design conditions and arranging the linear polarization film, the reflective polarization film and the quarter-wave plate on the plane of the display side of the first lens, it is helpful to reduce the film application process to reduce the manufacturing cost, and it is helpful to reduce the weight of the eyepiece optical system. In addition, when the optical axis area of ​​the eye side of the second lens is a convex surface, it can effectively collect the incident light. In addition, arranging a partial reflector on the display side of the second lens is also beneficial to increase the half field of view angle through the principle of reflection and polarization, and meet the consumer's demand for a wide field of view of the image screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The present invention is a schematic diagram illustrating how imaging light emitted by a display screen enters the eye through the eyepiece optical system.

[0010] Figure 2 It is a schematic diagram illustrating the surface structure of a lens.

[0011] Figure 3 It is a schematic diagram illustrating the concave-convex structure of a lens surface and the intersection of light rays.

[0012] Figure 4 is a schematic diagram illustrating the surface structure of a lens of Example 1.

[0013] Figure 5 is a schematic diagram illustrating the surface structure of a lens of Example 2.

[0014] Figure 6is a schematic diagram illustrating the surface structure of a lens of Example 3.

[0015] Figure 7 It is a schematic diagram of the eyepiece optical system of the first embodiment of the present invention.

[0016] Fig. 8A This is a diagram of the longitudinal spherical aberration field of view of the eyepiece optical system of the first embodiment when the wavelength is 546nm.

[0017] Figure 8B This is a half-viewing angle diagram of the field curvature (sagittal direction) on the display screen of the eyepiece optical system of the first embodiment when the wavelength is 546nm.

[0018] Figure 8C This is a half-viewing angle diagram of the field curvature (meridional direction) on the display screen of the eyepiece optical system of the first embodiment when the wavelength is 546nm.

[0019] Fig.8D This is a diagram of the distorted half-viewing angle of the eyepiece optical system of the first embodiment when the wavelength is 546nm.

[0020] Fig. 9 Detailed optical data of the eyepiece optical system of the first embodiment of the present invention is shown.

[0021] Fig.10 The aspheric parameters of the eyepiece optical system of the first embodiment of the present invention are shown.

[0022] Fig.11 It is a schematic diagram of the eyepiece optical system of the second embodiment of the present invention.

[0023] Fig. 12A This is a diagram of the longitudinal spherical aberration field of view of the eyepiece optical system of the second embodiment when the wavelength is 546nm.

[0024] Fig. 12B This is a half-viewing angle diagram of the field curvature (sagittal direction) on the display screen of the eyepiece optical system of the second embodiment when the wavelength is 546nm.

[0025] Fig. 12C This is a half-viewing angle diagram of the field curvature (meridian direction) on the display screen when the wavelength is 546nm for the eyepiece optical system of the second embodiment.

[0026] Fig.12D This is a diagram of the distorted half-viewing angle of the eyepiece optical system of the second embodiment when the wavelength is 546 nm.

[0027] Fig.13 Detailed optical data of the eyepiece optical system of the second embodiment of the present invention is shown.

[0028] Fig.14The aspheric parameters of the eyepiece optical system of the second embodiment of the present invention are shown.

[0029] Fig.15 It is a schematic diagram of the eyepiece optical system of the third embodiment of the present invention.

[0030] Fig.16A This is a diagram of the longitudinal spherical aberration field of view of the eyepiece optical system of the third embodiment when the wavelength is 546nm.

[0031] Fig. 16B This is a half-viewing angle diagram of the field curvature (sagittal direction) on the display screen of the eyepiece optical system of the third embodiment when the wavelength is 546nm.

[0032] Fig. 16C This is a half-viewing angle diagram of the field curvature (meridian direction) on the display screen when the wavelength is 546nm for the eyepiece optical system of the third embodiment.

[0033] Fig.16D This is a diagram of the distorted half-viewing angle of the eyepiece optical system of the third embodiment when the wavelength is 546nm.

[0034] Fig.17 Detailed optical data of the eyepiece optical system of the third embodiment of the present invention is shown.

[0035] Fig.18 The aspheric parameters of the eyepiece optical system of the third embodiment of the present invention are shown.

[0036] Fig.19 It is a schematic diagram of the eyepiece optical system of the fourth embodiment of the present invention.

[0037] Fig. 20A This is a diagram of the longitudinal spherical aberration field of view of the eyepiece optical system of the fourth embodiment when the wavelength is 546nm.

[0038] Fig. 20B This is a half-viewing angle diagram of the field curvature (sagittal direction) on the display screen of the eyepiece optical system of the fourth embodiment when the wavelength is 546nm.

[0039] Fig. 20C This is a half-viewing angle diagram of the field curvature (meridian direction) on the display screen when the wavelength is 546nm for the eyepiece optical system of the fourth embodiment.

[0040] Fig.20D This is a diagram of the distorted half-viewing angle of the eyepiece optical system of the fourth embodiment when the wavelength is 546 nm.

[0041] Fig.21 Detailed optical data of the eyepiece optical system of the fourth embodiment of the present invention is shown.

[0042] Fig. 22 The aspheric parameters of the eyepiece optical system of the fourth embodiment of the present invention are shown.

[0043] Fig.23 It is a schematic diagram of the eyepiece optical system of the fifth embodiment of the present invention.

[0044] Fig.24A This is a diagram of the longitudinal spherical aberration field of view of the eyepiece optical system of the fifth embodiment when the wavelength is 546nm.

[0045] Fig. 24B This is a half-viewing angle diagram of the field curvature (sagittal direction) on the display screen of the eyepiece optical system of the fifth embodiment when the wavelength is 546nm.

[0046] Fig.24C This is a half-viewing angle diagram of the field curvature (meridian direction) on the display screen when the eyepiece optical system of the fifth embodiment has a wavelength of 546 nm.

[0047] Fig.24D This is a diagram of the distorted half-viewing angle of the eyepiece optical system of the fifth embodiment when the wavelength is 546 nm.

[0048] Fig.25 Detailed optical data of the eyepiece optical system of the fifth embodiment of the present invention are shown.

[0049] Fig.26 The aspheric parameters of the eyepiece optical system of the fifth embodiment of the present invention are shown.

[0050] Fig. 27 It is a schematic diagram of the eyepiece optical system of the sixth embodiment of the present invention.

[0051] Fig.28A This is a diagram of the longitudinal spherical aberration field of view of the eyepiece optical system of the sixth embodiment when the wavelength is 546nm.

[0052] Fig.28B This is a half-viewing angle diagram of the field curvature (sagittal direction) on the display screen of the eyepiece optical system of the sixth embodiment when the wavelength is 546nm.

[0053] Fig.28C This is a half-viewing angle diagram of the field curvature (meridian direction) on the display screen of the eyepiece optical system of the sixth embodiment when the wavelength is 546nm.

[0054] Fig.28D This is a diagram of the distorted half-viewing angle of the eyepiece optical system of the sixth embodiment when the wavelength is 546 nm.

[0055] Fig.29 Detailed optical data of the eyepiece optical system of the sixth embodiment of the present invention are shown.

[0056] Fig.30 The aspheric parameters of the eyepiece optical system of the sixth embodiment of the present invention are shown.

[0057] Fig.31 It is a schematic diagram of the eyepiece optical system of the seventh embodiment of the present invention.

[0058] Fig.32A This is a diagram of the longitudinal spherical aberration field of view of the eyepiece optical system of the seventh embodiment when the wavelength is 546nm.

[0059] Fig.32B This is a half-viewing angle diagram of the field curvature (sagittal direction) on the display screen when the eyepiece optical system of the seventh embodiment has a wavelength of 546 nm.

[0060] Fig.32C This is a half-viewing angle diagram of the field curvature (meridian direction) on the display screen when the wavelength is 546nm for the eyepiece optical system of the seventh embodiment.

[0061] Fig.32D This is a diagram of the distorted half-viewing angle of the eyepiece optical system of the seventh embodiment when the wavelength is 546 nm.

[0062] Fig.33 Detailed optical data of the eyepiece optical system of the seventh embodiment of the present invention are shown.

[0063] Fig.34 The aspheric parameters of the eyepiece optical system of the seventh embodiment of the present invention are shown.

[0064] Fig.35 A numerical value 1 is shown in the relationship formula of the parameters of the eyepiece optical system of the first to seventh embodiments of the present invention.

[0065] Fig.36 Numerical value 2 of the relationship formula showing the parameters of the eyepiece optical system of the first to seventh embodiments of the present invention.

[0066] Fig.37 Numerical value three of the relationship equation showing the parameters of the eyepiece optical system of the first to seventh embodiments of the present invention.

[0067] Explanation of symbols:

[0068] 0: pupil; 1: first lens; 10, V100: eyepiece optical system

[0069] 100, 200, 300, 400, 500: lens;

[0070] 130: assembly part; 15, 25, 35, 45: side surface of the eye;

[0071] 151, 161, 251, 261, Z1: optical axis area;

[0072] 153, 163, 253, 263, Z2: circumferential area;

[0073] 16, 26, 36, 46: Display side view;

[0074] 2: second lens; 211, 212: parallel light rays;

[0075] 3: Linear polarizing film plus reflective polarizing film; 4: Quarter wavelength film;

[0076] 5: Part of the reflector; 99, V50: Display screen;

[0077] A1: eye side; A2: display side; CP: center point;

[0078] CP1: first center point; CP2: second center point; EL: extension line;

[0079] I: optical axis; Lc: principal ray; Lm: marginal ray; M, R: intersection point;

[0080] OB: optical boundary; TP1: first transition point; TP2: second transition point;

[0081] V60: eye; VD: visual distance; VI: imaging light;

[0082] VV: magnified virtual image; Z3: relay zone; ω: half viewing angle. DETAILED DESCRIPTION

[0083] Generally speaking, the light direction of the eyepiece optical system V100 is that an imaging light VI is emitted from the display screen V50, enters the eye V60 through the eyepiece optical system V100, focuses on the retina of the eye V60, and generates an enlarged virtual image VV at the clear vision distance VD, such as Figure 1 As shown. The judgment criteria for the optical specifications of this case are as follows: it is assumed that the direction of the light is reversely tracked as a parallel imaging light from the eye side through the eyepiece optical system to the display screen to focus the image. On the other hand, Figure 1 Where ω is the half visual angle, that is, the maximum angle of half the visual field of the eye V60.

[0084] The terms "optical axis region", "circumferential region", "concave surface" and "convex surface" used in this specification and the claims should be interpreted based on the definitions listed in this specification.

[0085] The optical system of this specification includes at least one lens, which receives the imaging light of the incident optical system that is parallel to the optical axis and within a half-viewing angle (HFOV) relative to the optical axis. The imaging light is imaged on the imaging plane through the optical system. The so-called "a lens having a positive refractive power (or a negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The so-called "eye side (or display side) of the lens" is defined as a specific range where the imaging light passes through the lens surface. The imaging light includes at least two types of light: the chief ray Lc and the marginal ray Lm (such as Figure 2 The eye side (or display side) of the lens can be divided into different areas according to different positions, including an optical axis area, a circumferential area, or one or more relay areas in some embodiments. The description of these areas will be described in detail below.

[0086] Figure 2 is a radial cross-sectional view of the lens 100. Two reference points on the surface of the lens 100 are defined: a center point and a transition point. The center point of the lens surface is an intersection of the surface and the optical axis I. Figure 2 As shown in the example, the first center point CP1 is located on the eye side 110 of the lens 100, and the second center point CP2 is located on the display side 120 of the lens 100. A transition point is a point on the lens surface, and the tangent of the point is perpendicular to the optical axis I. The optical boundary OB of the lens surface is defined as the point where the radially outermost edge ray Lm passing through the lens surface intersects with the lens surface. All transition points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, the surface of the lens 100 may have no transition points or at least one transition point. If a single lens surface has multiple transition points, the transition points are named in sequence from the first transition point in the radial outward direction. For example, the first transition point TP1 (closest to the optical axis I), the second transition point TP2 (closest to the optical axis I), and the second transition point TP2 (closest to the optical axis I). Figure 5 as shown) and the Nth conversion point (farthest from the optical axis I).

[0087] When the lens surface has at least one transition point, the range from the center point to the first transition point TP1 is defined as the optical axis area, wherein the optical axis area includes the center point. The area radially outward from the transition point farthest from the optical axis I (the Nth transition point) to the optical boundary OB is defined as the circumferential area. In some embodiments, a relay area between the optical axis area and the circumferential area may be further included, and the number of relay areas depends on the number of transition points. When the lens surface does not have a transition point, 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, and 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential area.

[0088] When a light ray parallel to the optical axis I passes through an area, if the light ray is deflected toward the optical axis I and the intersection with the optical axis I is located at the display side A2 of the lens, then the area is convex. When a light ray parallel to the optical axis I passes through an area, if the intersection of the extended line of the light ray and the optical axis I is located at the eye side A1 of the lens, then the area is concave.

[0089] In addition, see Figure 2 The lens 100 may further include an assembly portion 130 extending radially outward from the optical boundary OB. The assembly portion 130 is generally used for assembling the lens 100 to a corresponding component (not shown) of the optical system. The imaging light does not reach the assembly portion 130. The structure and shape of the assembly portion 130 are merely examples for illustrating the present invention and are not intended to limit the scope of the present invention. The assembly portion 130 of the lens discussed below may be partially or completely omitted in the drawings.

[0090] See also Figure 3 , define the area between the center point CP and the first transition point TP1 as the optical axis area Z1. Define the area between the first transition point TP1 and the optical boundary OB of the lens surface as the circumferential area Z2. Figure 3 As shown, after passing through the optical axis area Z1, the parallel light 211 intersects with the optical axis I at the display side A2 of the lens 200, that is, the focus of the parallel light 211 passing through the optical axis area Z1 is located at point R on the display side A2 of the lens 200. Since the light intersects with the optical axis I at the display side A2 of the lens 200, the optical axis area Z1 is a convex surface. On the contrary, the parallel light 212 diverges after passing through the circumferential area Z2. Figure 3 As shown, the extended line EL of the parallel light 212 after passing through the circumferential area Z2 intersects with the optical axis I at the eye side A1 of the lens 200, that is, the focus of the parallel light 212 passing through the circumferential area Z2 is located at the point M on the eye side A1 of the lens 200. Since the extended line EL of the light intersects with the optical axis I at the eye side A1 of the lens 200, the circumferential area Z2 is a concave surface. Figure 3 In the lens 200 shown, the first transition point TP1 is the boundary between the optical axis area and the circumferential area, that is, the first transition point TP1 is the boundary point where the convex surface turns into the concave surface.

[0091] On the other hand, the surface convexity of the optical axis area can also be determined according to the judgment method of the general knowledgeable person in the field, that is, the convexity of the surface shape of the optical axis area of ​​the lens can be determined by the positive and negative signs of the curvature radius of the paraxial axis (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet of optical design software. For the eye side, when the R value is positive, the optical axis area of ​​the eye side is determined to be convex; when the R value is negative, the optical axis area of ​​the eye side is determined to be concave. On the contrary, for the display side, when the R value is positive, the optical axis area of ​​the display side is determined to be concave; when the R value is negative, the optical axis area of ​​the display side is determined to be convex. The result of this method is consistent with the result of the above-mentioned determination method by the intersection of the light / light extension line and the optical axis. The determination method of the intersection of the light / light extension line and the optical axis is to determine the surface convexity by locating the focus of a light parallel to the optical axis on the eye side or the display side of the lens. The terms “a region is convex (or concave)”, “a region is convex (or concave)” or “a convex (or concave) region” described in this specification can be used interchangeably.

[0092] Figures 4 to 6 Examples are provided for determining the surface shape and area boundaries of lens areas in various situations, including the aforementioned optical axis area, circumferential area, and relay area.

[0093] Figure 4 is a radial cross-sectional view of the lens 300. Figure 4 , the display side surface 320 of the lens 300 has only one transition point TP1 within the optical boundary OB. The optical axis area Z1 and the circumferential area Z2 of the display side surface 320 of the lens 300 are as follows: Figure 4 As shown, the R value of the display side surface 320 is positive (ie, R>0), and therefore, the optical axis region Z1 is a concave surface.

[0094] Generally speaking, the shapes of the areas bounded by the conversion point are opposite to those of the adjacent areas. Therefore, the conversion point can be used to define the transition of the surface shape, that is, from concave to convex or from convex to concave. Figure 4 In the figure, since the optical axis area Z1 is a concave surface, the surface shape changes at the transition point TP1, so the circumferential area Z2 is a convex surface.

[0095] Figure 5 is a radial cross-sectional view of the lens 400. Figure 5 , there is a first transition point TP1 and a second transition point TP2 on the eye side surface 410 of the lens 400. The area between the optical axis I and the first transition point TP1 is defined as an optical axis region Z1 of the eye side surface 410. The R value of the eye side surface 410 is positive (ie, R>0), and therefore, the optical axis region Z1 is a convex surface.

[0096] The area between the second transition point TP2 and the optical boundary OB of the eye side surface 410 of the lens 400 is defined as a circumferential area Z2, and the circumferential area Z2 of the eye side surface 410 is also a convex surface. In addition, the area between the first transition point TP1 and the second transition point TP2 is defined as a relay area Z3, and the relay area Z3 of the eye side surface 410 is a concave surface. Figure 5 The eye-side surface 410 includes, radially outward from the optical axis I, an optical axis region Z1 between the optical axis I and the first conversion point TP1, a relay region Z3 between the first conversion point TP1 and the second conversion point TP2, and a circumferential region Z2 between the second conversion point TP2 and the optical boundary OB of the eye-side surface 410 of the lens 400. Since the optical axis region Z1 is a convex surface, the surface shape changes from the first conversion point TP1 to a concave surface, so the relay region Z3 is a concave surface, and the surface shape changes from the second conversion point TP2 to a convex surface, so the circumferential region Z2 is a convex surface.

[0097] Figure 6 is a radial cross-sectional view of the lens 500. The eye side surface 510 of the lens 500 has no transition point. For a lens surface without a transition point, such as the eye side surface 510 of the lens 500, 0% to 50% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the optical axis area, and 50% to 100% of the distance from the optical axis I to the optical boundary OB of the lens surface is defined as the circumferential area. Figure 6 The lens 500 shown in the figure defines the optical axis region Z1 of the eye side surface 510 as 50% of the distance from the optical axis I to the optical boundary OB of the lens 500 surface. The R value of the eye side surface 510 is positive (i.e., R>0), so the optical axis region Z1 is a convex surface. Since the eye side surface 510 of the lens 500 has no transition point, the circumferential region Z2 of the eye side surface 510 is also a convex surface. The lens 500 may further have an assembly portion (not shown) extending radially outward from the circumferential region Z2.

[0098] Figure 7 It is a schematic diagram of the eyepiece optical system of the first embodiment of the present invention. FIG. 8A to FIG. 8D The longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the first embodiment. Figure 7 The eyepiece optical system 10 of the first embodiment of the present invention includes a first lens 1, a linear polarization film plus a reflective polarization film 3, a quarter-wave plate 4, a second lens 2 and a partial reflector 5 in sequence from the eye side A1 to the display side A2 along an optical axis I of the eyepiece optical system 10. Figure 7 The light emitted by the display screen 99 shown in the figure enters an eye (such as Figure 7 The pupil 0) of the observer shown forms an image, and this image is a magnified virtual image.

[0099] In this embodiment, the first lens 1, the second lens 2, the linear polarization film plus reflective polarization film 3, and the quarter-wave plate 4 each have an eye-side surface 15, 25, 35, and 45 facing the eye side A1 and allowing the imaging light to pass through, and a display side surface 16, 26, 36, and 46 facing the display side A2 and allowing the imaging light to pass through. In this embodiment, the first lens 1 is placed between the pupil 0 and the second lens 2.

[0100] The first lens 1 has a positive refractive power. The optical axis region 151 and the circumferential region 153 of the eye side surface 15 of the first lens 1 are both convex surfaces. The optical axis region 161 and the circumferential region 163 of the display side surface 16 of the first lens 1 are both flat surfaces.

[0101] The second lens 2 has a positive refractive power. The optical axis region 251 of the eye side surface 25 of the second lens 2 is a convex surface, and the circumferential region 253 thereof is a concave surface. The optical axis region 261 and the circumferential region 263 of the display side surface 26 of the second lens 2 are both convex surfaces.

[0102] The reflective polarizing film is disposed on the linear polarizing film, and in the subsequent figures, the linear polarizing film and the reflective polarizing film 3 are collectively represented. The linear polarizing film is disposed on the plane of the optical axis region 161 of the display side surface 16 of the first lens 1 to reflect the imaging light having one of the linear polarization states and to allow the imaging light having another of the linear polarization states to pass. Specifically, the linear polarizing film and the reflective polarizing film 3 can be directly disposed on the entire display side surface 16 of the first lens 1.

[0103] The quarter-wave plate 4 is disposed on the reflective polarizing film, specifically in the direction of the optical axis I. The quarter-wave plate 4 is disposed between the linear polarizing film and the reflective polarizing film 3 and the second lens 2. The quarter-wave plate 4 is used to convert the imaging light in the circular polarization state into the imaging light in the linear polarization state, or convert the imaging light in the linear polarization state into the imaging light in the circular polarization state. Specifically, the quarter-wave plate 4 is disposed between the display side surface 16 of the first lens 1 and the eye side surface 25 of the second lens 2.

[0104] The partial reflector 5 is disposed on the display side surface 26 of the second lens 2 to reflect part of the energy of the imaging light. Specifically, in this embodiment, the partial reflector 5 is disposed on the optical axis region 261 of the display side surface 26 of the second lens 2, but the present invention is not limited thereto. The partial reflector 5 has an average optical reflectivity of at least 30% in a plurality of desired wavelengths, and in this embodiment, the partial reflector 5 is a half reflector.

[0105] In this embodiment, the eye-side surfaces 15, 25 and the display side surface 26 are all aspherical surfaces, so the part of the reflector 5 disposed on the display side surface 26 is substantially disposed conformally with the display side surface 26, and can also be an aspherical surface. In other words, the eye-side surfaces 15, 25 and the display side surface 26 can also be all aspherical surfaces.

[0106] Specifically, in this embodiment, the display screen (such as Figure 7 The display screen 99 shown provides imaging light with one of the circular polarization states, which passes through the second lens 2 to the quarter-wave plate 4 to form imaging light with one of the linear polarization states. The imaging light with one of the linear polarization states is transmitted to the linear polarization film and the reflective polarization film 3, and is reflected to produce imaging light with one of the linear polarization states. The imaging light with one of the linear polarization states passes through the quarter-wave plate 4 again to form imaging light with the other circular polarization state. After the imaging light with the other circular polarization state passes through the second lens 2, it is transmitted to the display side 26 of the second lens 2 including a partial reflector 5 to reflect the imaging light with the other circular polarization state. After the imaging light with the other circular polarization state passes through the second lens 2 again, it is transmitted to the quarter-wave plate 4 to form imaging light with the other linear polarization state. Finally, the imaging light with the other linear polarization state passes through the linear polarization film plus the reflective polarization film 3, and is transmitted to the first lens 1 to enter the observer's eyes (such as Figure 7 The pupil 0) of the observer shown forms a magnified virtual image.

[0107] Other detailed optical data of the first embodiment are as follows Fig. 9 As shown, the effective focal length (EFL) of the eyepiece optical system 10 of the first embodiment is 26.397 mm, the half field of view (HFOV) is 55.153 degrees, the TTL is 24.338 mm, the aperture value (F-number, Fno) is 6.597, and the maximum image height (Imageheight, ImgH) is 22.189 mm, wherein TTL refers to the distance from the eye side surface 11 of the first lens 1 to the display screen 99 on the optical axis I. It is worth mentioning that in Fig. 9 In the embodiments described below, the thickness or distance in the table has directionality, wherein the direction of the light toward the eye side A1 is defined as positive, and the direction of the light toward the display side A2 is defined as negative.

[0108] In addition, in this embodiment, the eye side surfaces 15, 25 and the display side surface 26 of the aspheric surface are general even asphere surfaces. These aspheric surfaces are defined according to the following formula (1):

[0109]

[0110] in:

[0111] R: radius of curvature of the lens surface at the near optical axis I;

[0112] Z: Depth of the aspherical surface (the vertical distance between the point on the aspherical surface that is Y away from the optical axis I and the tangent plane that is tangent to the vertex on the aspherical optical axis I);

[0113] Y: the vertical distance between the point on the aspheric curve and the optical axis I;

[0114] K: conic constant;

[0115] a i : i-th order aspheric coefficient.

[0116] The various aspheric coefficients of the eye side and display side of the above components are as follows: Fig.10 In this embodiment and the following embodiments, the cone coefficient and the second-order aspheric coefficient a2 are both 0, so the cone coefficient and the spherical coefficient a2 are omitted in the table.

[0117] In addition, the definition of the "inflection point" of the above-mentioned aspheric surface is to obtain the Y value when the second derivative of the function Z(Y) in formula (1) is equal to 0 after the second derivative of this function Z(Y). The point where this Y value is located is the inflection point, that is, this inflection point is a point on this aspheric surface, and the distance from the optical axis I is this Y value.

[0118] on the other hand, Figure 35 to Figure 37 The numerical values ​​of the relationship between the important parameters of the eyepiece optical system of the first to seventh embodiments of the present invention are shown. The relationship between the important parameters in the eyepiece optical system 10 of the first embodiment is as follows Figure 35 to Figure 37 shown.

[0119] in,

[0120] EFL is the system effective focal length of the eyepiece optical system 10;

[0121] HFOV is half field of view, the maximum angle of half the observer’s field of view;

[0122] ImgH is the maximum image height of the eyepiece optical system 10, which is half of the ICD (Image circle diameter);

[0123] Fno is the aperture value of the eyepiece optical system 10;

[0124] ObjH is the maximum height of the virtual image produced by the eyepiece optical system 10;

[0125] ObjD is the distance from the pupil 0 of the observer to the virtual image produced by the eyepiece optical system 10 on the optical axis I;

[0126] SL is the system length of the eyepiece optical system 10, the distance from the pupil 0 of the observer to the display screen 99 on the optical axis I;

[0127] TTL is the distance from the eye side surface 15 of the first lens 1 to the display screen 99 on the optical axis I;

[0128] ALT is the sum of the thicknesses of the first lens 1 and the second lens 2 on the optical axis I, that is, the sum of T1 and T2;

[0129] TL is the distance between the eye side surface 15 of the first lens 1 and the display side surface 26 of the second lens 2 on the optical axis I;

[0130] ER (Eye relief) is the exit pupil distance, that is, the distance from the observer's pupil 0 to the first lens 1 on the optical axis I;

[0131] Tlp+Trp+Tqwp is the sum of the thickness of the linear polarizing film plus the reflective polarizing film 3 and the quarter-wavelength plate 4 on the optical axis I;

[0132] T1 is the thickness of the first lens 1 on the optical axis I;

[0133] G12 is the distance between the display side surface 16 of the first lens 1 and the eye side surface 25 of the second lens 2 on the optical axis I;

[0134] T2 is the thickness of the second lens 2 on the optical axis I;

[0135] BFL is the distance from the display side surface 26 of the second lens 2 to the display screen 99 on the optical axis I;

[0136] V1 is the Vd Abbe number of the first lens 1;

[0137] V2 is the Vd Abbe number of the second lens 2;

[0138] n1 is the nd refractive index of the first lens 1;

[0139] n2 is the nd refractive index of the second lens 2;

[0140] AAG is the distance between the display side surface 15 of the first lens 1 and the eye side surface 26 of the second lens 2 on the optical axis I, i.e., G12;

[0141] OXR11 is the optical maximum radius of the eye side surface 15 of the first lens 1;

[0142] OXR12 is the optical maximum radius of the display side surface 16 of the first lens 1;

[0143] OXR21 is the optical maximum radius of the eye side surface 25 of the second lens 2;

[0144] OXR22 is the optical maximum radius of the display side surface 26 of the second lens 2;

[0145] Sag12 is the Sag value of the display side surface 16 of the first lens 1 at the optical maximum radius, wherein Sag is the depth of the aspheric surface calculated by the aspheric surface formula (the vertical distance between a point on the aspheric surface at a distance Y from the optical axis I and a tangent plane tangent to the vertex on the aspheric surface optical axis I);

[0146] Sag21 is the Sag value of the eye side surface 25 of the second lens 2 at the optical maximum radius;

[0147] Sag22 is the Sag value of the display side surface 26 of the second lens 2 at the optical maximum radius.

[0148] In addition, define:

[0149] EPD (Exit pupil diameter) is the exit pupil diameter of the eyepiece optical system 10, corresponding to the diameter of the observer's pupil 0, and is equal to EFL / Fno;

[0150] f1 is the focal length of the first lens 1;

[0151] f2 is the focal length of the second lens 2.

[0152] Also refer to FIG. 8A to FIG. 8D , Fig. 8A The diagram of the first embodiment illustrates the longitudinal spherical aberration (Longitudinal Spherical Aberration) on the display screen 99 when the representative wavelength is 546 nanometers (nm). Figure 8B and Figure 8C The figures respectively illustrate the field curvature aberration in the sagittal direction and the field curvature aberration in the tangential direction on the display screen 99 of the first embodiment when the wavelength is 546nm. Fig.8D The diagram of FIG. 1 illustrates the distortion aberration of the first embodiment on the display screen 99 when the wavelength is 546 nm. The longitudinal spherical aberration of the first embodiment is as follows: Fig. 8AAs shown, the curves formed by the above wavelengths are very close and close to the middle, indicating that the off-axis light rays at different heights are all concentrated near the imaging point. It can be seen from the deflection amplitude of the wavelength curve that the imaging point deviation of the off-axis light rays at different heights is controlled within the range of ±0.120 mm. Therefore, the first embodiment does significantly improve the spherical aberration of the same wavelength.

[0153] exist Figure 8B and Figure 8C In the two field curvature aberration diagrams, the focal length variation of the representative wavelength in the entire field of view falls within ±0.200 mm, indicating that the optical system of the first embodiment can effectively eliminate aberrations. Fig.8D The distortion diagram shows that the distortion of the present embodiment is maintained within the range of ±50%, indicating that the distortion of the present first embodiment has met the imaging quality requirements of the optical system. This shows that compared with the existing eyepiece optical system, the present first embodiment can still provide good imaging quality under the condition that the TTL has been shortened to 24.338 mm. Therefore, the present first embodiment can have a larger half viewing angle, a smaller volume, and excellent imaging quality while maintaining good optical performance.

[0154] Fig.11 FIG. 4 is a schematic diagram of an eyepiece optical system according to a second embodiment of the present invention. FIG. 12A to FIG. 12D This is a diagram of the longitudinal spherical aberration and various aberrations of the eyepiece optical system of the second embodiment. Fig.11 The second embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients, and parameters between the first lens 1 and the second lens 2 are more or less different. It should be noted that, in order to clearly display the drawing, Fig.11 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0155] The detailed optical data of the eyepiece optical system 10 of the second embodiment are as follows: Fig.13 As shown, the EFL of the eyepiece optical system 10 of the second embodiment is 23.749 mm, the HFOV is 54.418 degrees, the TTL is 24.589 mm, the Fno is 5.935, and the ImgH is 20.167 mm.

[0156] Fig.14 The aspheric coefficients of the side surfaces 15, 25, 35 and 45 of the second embodiment and the side surfaces 16, 26, 36 and 46 in the above formula (1) are also shown.

[0157] In addition, the relationship between the important parameters in the eyepiece optical system 10 of the second embodiment is as follows: Figure 35 to Figure 37 shown.

[0158] Fig. 12AThe longitudinal spherical aberration of the second embodiment is shown, and the imaging point deviation of off-axis light rays at different heights is controlled within the range of ±0.060 mm. Fig. 12B and Fig. 12C In the two field curvature aberration diagrams, the focal length variation of the wavelength in the entire field of view falls within ±0.120 mm. Fig.12D The distortion diagram shows that the distortion of this embodiment is maintained within the range of ±40%.

[0159] It can be known from the above description that the aperture of the second embodiment is larger than that of the first embodiment. Therefore, compared with the first embodiment, the second embodiment has a larger amount of light entering. In addition, the longitudinal spherical aberration of the second embodiment is smaller than that of the first embodiment, the field curvature aberration of the second embodiment is smaller than that of the first embodiment, and the distortion aberration of the second embodiment is smaller than that of the first embodiment, and has better imaging quality.

[0160] Fig.15 FIG. 4 is a schematic diagram of an eyepiece optical system according to a third embodiment of the present invention. FIG. 16A to FIG. 16D The longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the third embodiment. Fig.15 The third embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients, and parameters between the first lens 1, the second lens 2, the linear polarization film plus the reflective polarization film 3, and the quarter-wave plate 4 are more or less different. It should be noted here that in order to clearly display the drawings, Fig.15 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0161] The detailed optical data of the eyepiece optical system 10 of the third embodiment are as follows: Fig.17 As shown, the EFL of the eyepiece optical system 10 of the third embodiment is 26.234 mm, the HFOV is 55.113 degrees, the TTL is 20.864 mm, the Fno is 6.557, and the ImgH is 22.360 mm.

[0162] Fig.18 The aspheric coefficients of the side surfaces 15, 25, 35, 45 of the third embodiment and the side surfaces 16, 26, 36, 46 in the above formula (1) are also shown.

[0163] In addition, the relationship between the important parameters in the eyepiece optical system 10 of the third embodiment is as follows: Figure 35 to Figure 37 shown.

[0164] Fig.16A The longitudinal spherical aberration of the third embodiment is shown, and the imaging point deviation of off-axis light rays at different heights is controlled within the range of ±0.030 mm. Fig. 16B and Fig. 16C In the two field curvature aberration diagrams, the focal length variation of the wavelength in the entire field of view falls within ±0.200 mm. Fig.16D The distortion diagram shows that the distortion of this embodiment is maintained within the range of ±50%.

[0165] It can be known from the above description that the system length of the third embodiment is shorter than that of the first embodiment. Therefore, compared with the first embodiment, the third embodiment has a smaller volume. The aperture of the third embodiment is larger than that of the first embodiment. Therefore, compared with the first embodiment, the third embodiment has a larger amount of light entering. The image height of the third embodiment is larger than that of the first embodiment. Therefore, compared with the first embodiment, the third embodiment has a better brightness sensitivity. In addition, the longitudinal spherical aberration of the third embodiment is smaller than that of the first embodiment, and has a better imaging quality.

[0166] Fig.19 FIG. 4 is a schematic diagram of an eyepiece optical system according to a fourth embodiment of the present invention. FIG. 20A to FIG. 20D This is a diagram of the longitudinal spherical aberration and various aberrations of the eyepiece optical system of the fourth embodiment. Fig.19 The fourth embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients, and parameters between the first lens 1, the second lens 2, the linear polarization film plus the reflective polarization film 3, and the quarter-wave plate 4 are more or less different. In addition, in this embodiment, the circumferential area 153 of the eye side surface 15 of the first lens 1 is a concave surface. It should be noted here that in order to clearly show the drawing, Fig.19 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0167] The detailed optical data of the eyepiece optical system 10 of the fourth embodiment are as follows: Fig.21 As shown, the EFL of the eyepiece optical system 10 of the fourth embodiment is 26.295 mm, the HFOV is 55.164 degrees, the TTL is 25.000 mm, the Fno is 6.572, and the ImgH is 22.080 mm.

[0168] Fig. 22 The aspheric coefficients of the side surfaces 15, 25, 35, 45 and the side surfaces 16, 26, 36, 46 in the above formula (1) of the fourth embodiment are also shown.

[0169] In addition, the relationship between the important parameters in the eyepiece optical system 10 of the fourth embodiment is as follows: Figure 35 to Figure 37 shown.

[0170] Fig. 20AThe longitudinal spherical aberration of the fourth embodiment is shown, and the imaging point deviation of off-axis light rays at different heights is controlled within the range of ±0.040 mm. Fig. 20B and Fig. 20C In the two field curvature aberration diagrams, the focal length variation of the wavelength in the entire field of view falls within ±0.400 mm. Fig.20D The distortion diagram shows that the distortion of this embodiment is maintained within the range of ±50%.

[0171] It can be known from the above description that the half viewing angle of the fourth embodiment is greater than the half viewing angle of the first embodiment. Therefore, compared with the first embodiment, the fourth embodiment has a larger angle range for receiving images. The aperture of the fourth embodiment is greater than the aperture of the first embodiment. Therefore, compared with the first embodiment, the fourth embodiment has a larger amount of light entering. The image height of the fourth embodiment is greater than the image height of the first embodiment. Therefore, compared with the first embodiment, the fourth embodiment has better brightness sensitivity. In addition, the longitudinal spherical aberration of the fourth embodiment is smaller than the longitudinal spherical aberration of the first embodiment, and has better imaging quality.

[0172] Fig.23 FIG. 4 is a schematic diagram of an eyepiece optical system according to a fifth embodiment of the present invention. FIG. 24A to FIG. 24D The longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the fifth embodiment. Fig.23 The fifth embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients, and parameters between the first lens 1, the second lens 2, the linear polarization film plus the reflective polarization film 3, and the quarter-wave plate 4 are more or less different. It should be noted here that in order to clearly display the drawings, Fig.23 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0173] The detailed optical data of the eyepiece optical system 10 of the fifth embodiment are as follows: Fig.25 As shown, the EFL of the eyepiece optical system 10 of the fifth embodiment is 25.390 mm, the HFOV is 55.143 degrees, the TTL is 25.000 mm, the Fno is 6.347, and the ImgH is 21.790 mm.

[0174] Fig.26 The aspheric coefficients of the side surfaces 15, 25, 35, 45 of the fifth embodiment and the side surfaces 16, 26, 36, 46 in the above formula (1) are also shown.

[0175] In addition, the relationship between the important parameters in the eyepiece optical system 10 of the fifth embodiment is as follows: Figure 35 to Figure 37 shown.

[0176] Fig.24AThe longitudinal spherical aberration of the fifth embodiment is shown, and the imaging point deviation of off-axis light rays at different heights is controlled within the range of ±0.10 mm. Fig. 24B and Fig.24C In the two field curvature aberration diagrams, the focal length variation of the representative wavelength in the entire field of view falls within ±0.800 mm. Fig.24D The distortion diagram shows that the distortion of this embodiment is maintained within the range of ±50%.

[0177] From the above description, it can be known that the aperture of the fifth embodiment is larger than that of the first embodiment. Therefore, compared with the first embodiment, the fifth embodiment has a larger amount of light entering. The image height of the fifth embodiment is larger than that of the first embodiment. Therefore, compared with the first embodiment, the fifth embodiment has a better brightness sensitivity. In addition, the longitudinal spherical aberration of the fifth embodiment is smaller than that of the first embodiment, and has a better imaging quality.

[0178] Fig. 27 FIG. 4 is a schematic diagram of an eyepiece optical system according to a sixth embodiment of the present invention. FIG. 28A to FIG. 28D The longitudinal spherical aberration and various aberration diagrams of the eyepiece optical system of the sixth embodiment. Fig. 27 The sixth embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients, and parameters between the first lens 1, the second lens 2, the linear polarization film plus the reflective polarization film 3, and the quarter-wave plate 4 are more or less different. In addition, in this embodiment, the circumferential area 153 of the eye side surface 15 of the first lens 1 is a concave surface. It should be noted here that in order to clearly show the drawing, Fig. 27 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0179] The detailed optical data of the eyepiece optical system 10 of the sixth embodiment are as follows: Fig.29 As shown, the EFL of the eyepiece optical system 10 of the sixth embodiment is 25.416 mm, the HFOV is 55.203 degrees, the TTL is 24.837 mm, the Fno is 6.352, and the ImgH is 21.173 mm.

[0180] Fig.30 The aspheric coefficients of the side surfaces 15, 25, 35, 45 of the sixth embodiment and the side surfaces 16, 26, 36, 46 in the above formula (1) are also shown.

[0181] In addition, the relationship between the important parameters in the eyepiece optical system 10 of the sixth embodiment is as follows: Figure 35 to Figure 37 shown.

[0182] Fig.28AThe longitudinal spherical aberration of the sixth embodiment is shown, and the imaging point deviation of off-axis light rays at different heights is controlled within the range of ±0.050 mm. Fig.28B and Fig.28C In the two field curvature aberration diagrams, the focal length variation of the wavelength in the entire field of view falls within ±0.16 mm. Fig.28D The distortion diagram shows that the distortion of this embodiment is maintained within the range of ±50%.

[0183] It can be known from the above description that the half viewing angle of the sixth embodiment is greater than the half viewing angle of the first embodiment. Therefore, compared with the first embodiment, the sixth embodiment has a larger angle range for receiving images. The aperture of the sixth embodiment is greater than the aperture of the first embodiment. Therefore, compared with the first embodiment, the sixth embodiment has a larger amount of light entering. In addition, the longitudinal spherical aberration of the sixth embodiment is smaller than the longitudinal spherical aberration of the first embodiment, and has better imaging quality.

[0184] Fig.31 FIG. 4 is a schematic diagram of an eyepiece optical system according to a seventh embodiment of the present invention. FIG. 32A to FIG. 32D This is a diagram of the longitudinal spherical aberration and various aberrations of the eyepiece optical system of the seventh embodiment. Fig.31 The seventh embodiment of the eyepiece optical system 10 of the present invention is substantially similar to the first embodiment, and the differences between the two are as follows: the optical data, aspheric coefficients, and parameters between the first lens 1, the second lens 2, the linear polarization film plus the reflective polarization film 3, and the quarter-wave plate 4 are more or less different. It should be noted here that in order to clearly display the drawings, Fig.31 Part of the numbers of the optical axis area and the circumferential area having a surface shape similar to that of the first embodiment are omitted.

[0185] The detailed optical data of the eyepiece optical system 10 of the seventh embodiment are as follows: Fig.33 As shown, the EFL of the eyepiece optical system 10 of the seventh embodiment is 25.462 mm, the HFOV is 55.161 degrees, the TTL is 23.400 mm, the Fno is 6.363, and the ImgH is 21.688 mm.

[0186] Fig.34 The aspheric coefficients of the side surfaces 15, 25, 35, 45 of the seventh embodiment and the side surfaces 16, 26, 36, 46 in the above formula (1) are also shown.

[0187] In addition, the relationship between the important parameters in the eyepiece optical system 10 of the seventh embodiment is as follows: Figure 35 to Figure 37 shown.

[0188] Fig.32A The longitudinal spherical aberration of the seventh embodiment is shown, and the imaging point deviation of off-axis light rays at different heights is controlled within the range of ±0.040 mm. Fig.32B and Fig.32C In the two field curvature aberration diagrams, the focal length variation of the wavelength in the entire field of view falls within ±0.120 mm. Fig.32D The distortion diagram shows that the distortion of this embodiment is maintained within the range of ±50%.

[0189] It can be known from the above description that the system length of the seventh embodiment is shorter than that of the first embodiment. Therefore, compared with the first embodiment, the seventh embodiment has a smaller volume. The aperture of the seventh embodiment is larger than that of the first embodiment. Therefore, compared with the first embodiment, the seventh embodiment has a larger amount of light entering. The image height of the seventh embodiment is larger than that of the first embodiment. Therefore, compared with the first embodiment, the seventh embodiment has better brightness sensitivity. In addition, the longitudinal spherical aberration of the seventh embodiment is smaller than that of the first embodiment, and the field curvature aberration of the seventh embodiment is smaller than that of the first embodiment, and the field curvature aberration of the seventh embodiment is smaller than that of the first embodiment, and has better imaging quality.

[0190] In one embodiment of the present invention, when the linear polarizing film and the reflective polarizing film 3 and the quarter-wave plate 4 are arranged on the plane of the display side 16 of the first lens 1, it is beneficial to reduce the film application process to reduce the manufacturing cost. And when the optical axis area 251 of the eye side 25 of the second lens 2 is convex, the incident light can be effectively collected. When the above is matched with TTL / BFL≤8.200, it is beneficial to shorten the system length and increase the half viewing angle. The preferred limit is 2.100≤TTL / BFL≤8.200. When the above is matched with ImgH / (T1+G12)≥2.900, it is beneficial to reduce the size of the display by controlling the thickness of the lens, and it is beneficial to reduce the volume and weight of the display, thereby reducing the volume and weight of the eyepiece optical system 10. The preferred limit is 7.100≥ImgH / (T1+G12)≥2.900. When the first lens has a positive refractive power and the second lens has a positive refractive power, the imaging quality can be improved.

[0191] In one embodiment of the present invention, when the linear polarizing film and the reflective polarizing film 3 and the quarter-wave plate 4 are arranged on the plane of the display side 16 of the first lens 1, it is beneficial to reduce the film application process to reduce the manufacturing cost. And when the optical axis area 251 of the eye side 25 of the second lens 2 is convex, the incident light can be effectively collected. When the above is matched with TTL / BFL≤8.200, it is beneficial to shorten the system length and increase the half viewing angle. The preferred limit is 2.100≤TTL / BFL≤8.200. When the above is matched with (ImgH+BFL) / (T1+G12)≥3.200, it is beneficial to reduce the volume and weight of the display, thereby reducing the volume and weight of the eyepiece optical system 10. It is beneficial to maintain the image height while maintaining the optimal distance of the optical back focus. The preferred limit is 10.100≥(ImgH+BFL) / (T1+G12)≥3.200. When the first lens has a positive refractive power and the second lens has a positive refractive power, the imaging quality can be improved.

[0192] In one embodiment of the present invention, when the linear polarizing film and the reflective polarizing film 3 and the quarter-wave plate 4 are arranged on the plane of the display side 16 of the first lens 1, it is beneficial to reduce the film application process to reduce the manufacturing cost. And when the optical axis area 251 of the eye side surface 25 of the second lens 2 is convex, the incident light can be effectively collected. The above setting plus the condition that the circumferential area 253 of the eye side surface 25 of the second lens 2 is concave is beneficial to increase the half field angle through the principle of reflection and polarization. The above combination (ImgH+BFL) / (T1+G12)≥3.500 is beneficial to reduce the volume and weight of the display, and then reduce the volume and weight of the eyepiece optical system 10. It is beneficial to maintain the image height while maintaining the optimal distance of the optical back focus. The preferred limit is 10.100≥(ImgH+BFL) / (T1+G12)≥3.700. When the first lens has a positive refractive power and the second lens has a positive refractive power, the imaging quality can be improved.

[0193] In one embodiment of the present invention, when the linear polarizing film and the reflective polarizing film 3 and the quarter-wave plate 4 are arranged on the plane of the display side 16 of the first lens 1, it is beneficial to reduce the film application process to reduce the manufacturing cost. And when the optical axis area 251 of the eye side 25 of the second lens 2 is convex, it can effectively collect the incident light. The above arrangement plus the partial reflector 5 arranged on the convex surface of the display side 26 of the second lens 2 is beneficial to increase the half field angle through the principle of reflection and polarization. When the first lens has a positive refractive power and the second lens has a positive refractive power, the imaging quality can be improved.

[0194] Furthermore, the eyepiece optical system 10 can satisfy the following conditional formula: 4.800≦ImgH / T1; or 1.700≦ImgH / T2; or 3.900≦ImgH / G12; or 5.000≦(ImgH+TTL) / (T1+G12); or 2.100≦(ImgH+TTL) / TL; or 2.900≦(ImgH+TTL) / ALT. The above conditions are helpful to reduce the volume and weight of the display (i.e., the display providing the display screen 99), thereby reducing the volume and weight of the eyepiece optical system 10. Preferred range: 5.200≦ImgH / T1≦11.200; or 1.900≦ImgH / T2≦2.400; or 4.200≦ImgH / G12≦18.900; or 5.600≦(ImgH+TTL) / (T1+G12)≦14.700; or 2.300≦(ImgH+TTL) / TL≦3.600; or 3.200≦(ImgH+TTL) / ALT≦3.900.

[0195] Furthermore, the eyepiece optical system 10 can satisfy the following conditional expressions: 5.500≦EFL / T1; or EFL / T2≦3.000; or EFL / G12≦24.600; or 3.000≦EFL / (T1+G12); or 3.400≦(EFL+BFL) / (T1+G12); or 5.500≦(EFL+TTL) / (T1+G12); or 2.300≦(EFL+TTL) / TL; or 3.100≦(EFL+TTL) / ALT; or 2.400≦TTL / (T1+G12); or TTL / TL≦2.100; or TTL / ALT≦2.300. The above conditions are helpful to shorten the system length, thereby reducing the volume and weight of the eyepiece optical system 10. Preferred range: 6.200≦EFL / T1≦13.300; or 2.200≦EFL / T2≦2.800; or 5.000≦EFL / G12≦22.400; or 3.400≦EFL / (T1+G12)≦8.400; or 3.700≦(EFL+BFL) / (T1+G12)≦11.400; or 6.100≦(EFL+T TL) / (T1+G12)≦16.100; or 2.500≦(EFL+TTL) / TL≦3.900; or 3.400≦(EFL+TTL) / ALT≦4.300; or 2.700≦TTL / (T1+G12)≦7.700; or 1.100≦TTL / TL≦2.000; or 1.500≦TTL / ALT≦2.100.

[0196] Furthermore, the eyepiece optical system 10 can satisfy the following conditional formula: 6.400 degrees / mm≦HFOV / (T1+G12); or 12.100 degrees / mm≦HFOV / T1; or 4.300 degrees / mm≦HFOV / T2; or 9.500 degrees / mm≦HFOV / G12. In accordance with the above conditions, the system length can be shortened while maintaining a good half viewing angle, which is beneficial to reducing the volume and weight of the eyepiece optical system 10. The preferred range is: 7.100 degrees / mm≦HFOV / (T1+G12)≦17.500 degrees / mm; or 13.400 degrees / mm≦HFOV / T1≦27.900 degrees / mm; or 4.700 degrees / mm≦HFOV / T2≦6.400 degrees / mm; or 10.500 degrees / mm≦HFOV / G12≦47.500 degrees / mm.

[0197] Furthermore, the eyepiece optical system 10 can satisfy the following conditional formula: 1.000≦OXR11 / ImgH≦1.800; or 1.300≦OXR12 / ImgH≦1.800; or 1.400≦OXR21 / ImgH≦1.800; or 1.400≦OXR22 / ImgH≦1.800. The above conditions are helpful to reduce the volume and weight of the display (i.e., the display providing the display screen 99), thereby reducing the volume and weight of the eyepiece optical system 10.

[0198] Furthermore, the eyepiece optical system 10 can satisfy the following conditional formula: 7.300≦OXR11 / T1≦19.100; or 7.300≦OXR12 / T1≦19.100; or 2.700≦OXR21 / T2≦4.200; or 2.700≦OXR22 / T2≦4.200. The above conditions are conducive to maintaining the thickness and size of the first lens 1 and the second lens 2 within a suitable range to increase the manufacturing yield.

[0199] Furthermore, the eyepiece optical system 10 can satisfy the following conditional formula: 1.600≦(OXR11+OXR12) / (ImgH+BFL)≦3.200; or 1.800≦(OXR21+OXR22) / (ImgH+BFL)≦3.300. The above conditions are helpful to improve the magnification of the virtual image formed by the display screen 99 while reducing the volume and weight of the display.

[0200] Furthermore, the eyepiece optical system 10 can satisfy the following condition: 4.300≦|OXR22 / Sag22|≦6.200, which is beneficial to increase the manufacturing yield while reducing the volume and weight of the display.

[0201] In summary, the beneficial effects of the eyepiece optical system of the embodiment of the present invention are: by satisfying the optical design conditions and arranging the linear polarization film, the reflective polarization film and the quarter-wave plate on the plane of the display side of the first lens, it is helpful to reduce the film application process to reduce the manufacturing cost, and it is helpful to reduce the weight of the eyepiece optical system. In addition, when the optical axis area of ​​the eye side of the second lens is a convex surface, it can effectively collect the incident light. In addition, arranging a partial reflector on the display side of the second lens is also beneficial to increase the half field of view angle through the principle of reflection and polarization, and meet the consumer's demand for a wide field of view of the image screen.

[0202] The contents disclosed in each embodiment of the present invention include but are not limited to optical parameters such as focal length, lens thickness, and Abbe number. For example, the present invention discloses an optical parameter A and an optical parameter B in each embodiment, wherein the ranges covered by these optical parameters, the comparison relationship between the optical parameters, and the conditional ranges covered by multiple embodiments are specifically explained as follows:

[0203] (1) The range covered by the optical parameter, for example: α2≦A≦α1 or β2≦B≦β1, α1 is the maximum value of the optical parameter A in multiple embodiments, α2 is the minimum value of the optical parameter A in multiple embodiments, β1 is the maximum value of the optical parameter B in multiple embodiments, and β2 is the minimum value of the optical parameter B in multiple embodiments.

[0204] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0205] (3) The conditional range covered by multiple embodiments, specifically, the combination relationship or proportional relationship obtained by possible calculation of multiple optical parameters of the same embodiment, these relationships are defined as E. E can be, for example: A+B or AB or A / B or A*B or (A*B)1 / 2, and E satisfies the conditional expression E≦γ1 or E≧γ2 or γ2≦E≦γ1, γ1 and γ2 are the values ​​obtained by calculating the optical parameters A and B of the same embodiment, and γ1 is the maximum value among multiple embodiments of the present invention, and γ2 is the minimum value among multiple embodiments of the present invention.

[0206] The ranges covered by the above optical parameters, the comparison relationship between the optical parameters, and the maximum and minimum values ​​of the conditional expressions, as well as the numerical ranges within the maximum and minimum values, are all features that can be implemented by the present invention and are within the scope disclosed by the present invention. The above is only an example and should not be limited to this.

[0207] All embodiments of the present invention can be implemented, and some feature combinations can be extracted from the same embodiment. Compared with the prior art, the feature combination can also achieve unexpected effects of the present case. The feature combination includes but is not limited to the combination of features such as face shape, refractive index and conditional formula. The disclosure of the implementation mode of the present invention is a specific embodiment to illustrate the principle of the present invention, and the present invention should not be limited to the disclosed embodiment. In other words, the embodiment and its drawings are only for demonstration of the present invention and are not limited thereto.

Claims

1. An eyepiece optical system, configured to allow imaging light from a display screen to pass through the eyepiece optical system and enter an observer's eye to form an image, wherein a side facing the eye is an eye side and a side facing the display screen is a display side, the eyepiece optical system comprises a first lens and a second lens in sequence along an optical axis from the eye side to the display side, the first lens to the second lens each comprising an eye side surface facing the eye side and allowing the imaging light to pass through and a display side surface facing the display side and allowing the imaging light to pass through, characterized in that: The eyepiece optical system also includes a linear polarizing film, a reflective polarizing film, a quarter-wave plate and a partial reflector; The quarter-wave plate is arranged on the reflective polarizing film, the reflective polarizing film is arranged on the linear polarizing film, and the linear polarizing film is arranged on a plane of an optical axis region of the display side surface of the first lens; The first lens has a positive refractive power; the second lens has a positive refractive power; An optical axis region of the eye-side surface of the second lens is a convex surface; The eyepiece optical system satisfies the following conditional formulas: TTL / BFL≤8.200 and ImgH / (T1+G12)≥2.900, wherein TTL is the distance from the eyepiece side of the first lens to the display screen on the optical axis, BFL is the distance from the display side of the second lens to the display screen on the optical axis, ImgH is the maximum image height of the eyepiece optical system, T1 is the thickness of the first lens on the optical axis, and G12 is the distance from the display side of the first lens to the eyepiece side of the second lens on the optical axis.

2. An eyepiece optical system, configured to allow imaging light from a display screen to pass through the eyepiece optical system and enter an observer's eye to form an image, wherein a side facing the eye is an eye side and a side facing the display screen is a display side, the eyepiece optical system comprises a first lens and a second lens in sequence along an optical axis from the eye side to the display side, the first lens to the second lens each comprising an eye side surface facing the eye side and allowing the imaging light to pass through and a display side surface facing the display side and allowing the imaging light to pass through, characterized in that: The eyepiece optical system also includes a linear polarizing film, a reflective polarizing film, a quarter-wave plate and a partial reflector; The quarter-wave plate is arranged on the reflective polarizing film, the reflective polarizing film is arranged on the linear polarizing film, and the linear polarizing film is arranged on a plane of an optical axis region of the display side surface of the first lens; The first lens has a positive refractive power; the second lens has a positive refractive power; An optical axis region of the eye-side surface of the second lens is a convex surface; The eyepiece optical system satisfies the following conditional formulas: 2.100≤TTL / BFL≤8.200 and (ImgH+BFL) / (T1+G12)≥3.200, wherein TTL is the distance from the eyepiece side of the first lens to the display screen on the optical axis, BFL is the distance from the display side of the second lens to the display screen on the optical axis, ImgH is the maximum image height of the eyepiece optical system, T1 is the thickness of the first lens on the optical axis, and G12 is the distance from the display side of the first lens to the eyepiece side of the second lens on the optical axis.

3. The eyepiece optical system according to claim 1 or 2, characterized in that: The eyepiece optical system further satisfies the following formula: (ImgH+TTL) / (T1+G12)≥5.

000.

4. The eyepiece optical system according to claim 1 or 2, characterized in that: The eyepiece optical system further satisfies the following formula: (ImgH+TTL) / TL≥2.100, wherein TL is the distance from the eye side of the first lens to the display side of the second lens on the optical axis.

5. The eyepiece optical system according to claim 1 or 2, characterized in that: The eyepiece optical system further satisfies the following formula: (ImgH+TTL) / ALT≥2.900, wherein ALT is the sum of the thicknesses of the first lens and the second lens on the optical axis.

6. The eyepiece optical system according to claim 1 or 2, characterized in that: The eyepiece optical system further satisfies the following formula: (EFL+TTL) / (T1+G12)≥5.500, wherein EFL is the system focal length of the eyepiece optical system.

7. An eyepiece optical system, configured to allow imaging light from a display screen to pass through the eyepiece optical system and enter the eye of an observer to form an image, wherein a side facing the eye is an eye side and a side facing the display screen is a display side, the eyepiece optical system comprises a first lens and a second lens in sequence along an optical axis from the eye side to the display side, the first lens to the second lens each comprising an eye side surface facing the eye side and allowing the imaging light to pass through and a display side surface facing the display side and allowing the imaging light to pass through, characterized in that: The eyepiece optical system also includes a linear polarizing film, a reflective polarizing film, a quarter-wave plate and a partial reflector; An optical axis region of the display side surface of the first lens is a plane; the first lens has a positive refractive power; The second lens has a positive refractive power; an optical axis region of the eye side surface of the second lens is a convex surface, and a circumferential region of the eye side surface of the second lens is a concave surface; The eyepiece optical system satisfies the following conditional formula: (ImgH+BFL) / (T1+G12)≥3.500, wherein ImgH is the maximum image height of the eyepiece optical system, BFL is the distance from the display side of the second lens to the display screen on the optical axis, T1 is the thickness of the first lens on the optical axis, and G12 is the distance from the display side of the first lens to the eye side of the second lens on the optical axis.

8. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: ImgH / T1≥4.

800.

9. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: ImgH / T2≥1.700, wherein T2 is the thickness of the second lens on the optical axis.

10. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: ImgH / G12≥3.

900.

11. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: EFL / T1≥5.500, wherein EFL is the system focal length of the eyepiece optical system.

12. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: EFL / T2≤3.000, wherein EFL is the system focal length of the eyepiece optical system, and T2 is the thickness of the second lens on the optical axis.

13. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: EFL / G12≤24.600, wherein EFL is the system focal length of the eyepiece optical system.

14. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: EFL / (T1+G12)≥3.000, wherein EFL is the system focal length of the eyepiece optical system.

15. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: (EFL+BFL) / (T1+G12)≥3.400, wherein EFL is the system focal length of the eyepiece optical system.

16. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: 1.300≤OXR12 / ImgH≤1.800, wherein OXR12 is the optical maximum radius of the display side of the first lens.

17. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: 2.700≤OXR22 / T2≤4.200, wherein OXR22 is the optical maximum radius of the display side of the second lens, and T2 is the thickness of the second lens on the optical axis.

18. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: 1.600≤(OXR11+OXR12) / (ImgH+BFL)≤3.200, wherein OXR11 is the optical maximum radius of the eye side of the first lens, and OXR12 is the optical maximum radius of the display side of the first lens.

19. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: 7.300≤OXR12 / T1≤19.100, wherein OXR12 is the optical maximum radius of the display side of the first lens.

20. The eyepiece optical system according to any one of claims 1, 2 and 7, characterized in that: The eyepiece optical system further satisfies the following formula: 4.300≤|OXR22 / Sag22|≤6.200, wherein OXR22 is the optical maximum radius of the display side of the second lens, and Sag22 is the Sag value of the display side of the second lens at the optical maximum radius.

21. An eyepiece optical system, configured to allow imaging light from a display screen to pass through the eyepiece optical system and enter an observer's eye to form an image, wherein a side facing the eye is an eye side and a side facing the display screen is a display side, the eyepiece optical system comprises a first lens and a second lens in sequence along an optical axis from the eye side to the display side, the first lens to the second lens each comprising an eye side surface facing the eye side and allowing the imaging light to pass through and a display side surface facing the display side and allowing the imaging light to pass through, characterized in that: The eyepiece optical system also includes a linear polarizing film, a reflective polarizing film, a quarter-wave plate and a partial reflector; The first lens has a positive refractive power; the second lens has a positive refractive power; An optical axis region of the display side surface of the first lens is a plane; An optical axis region of the eye side surface of the second lens is a convex surface, and an optical axis region of the display side surface of the second lens is a convex surface.

Images