Visual system and electronic device

Abstract

This application provides a visual system and an electronic device. The visual system includes a lens barrel, an auxiliary lens barrel element, a lens group, and an image surface. The lens group includes: a first lens; a reflective polarizing element; a first quarter-wave plate; a second lens; a second quarter-wave plate; and a polarizer, the second side surface of which is at least partially attached to the image surface. The lens group also includes a first spacer element. The visual system satisfies: 2.40 < CT1 / Lb < 4.55; 1.05 < L / (CTR+CTQ1+CT2) < 1.75; 3.30 <(f1+f2) / (d1s+d1m)<4.20; CT1 is the center thickness of the first lens, Lb is the maximum height of the auxiliary lens element, L is the maximum height of the lens barrel, CTR is the center thickness of the reflective polarizing element, CTQ1 is the center thickness of the first quarter-wave plate, CT2 is the center thickness of the second lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, d1s is the inner diameter of the first side surface of the first spacer element, and d1m is the inner diameter of the second side surface of the first spacer element. This visual system can reduce stray light spots.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to a visual system and electronic equipment. Background Technology

[0002] Visual systems are widely used in medical, industrial, and aerospace fields, and their optical performance is crucial. Currently, the demands for miniaturization and high-precision imaging place higher requirements on the compactness, lightweight design, and imaging quality of visual systems.

[0003] Stray light is one of the key negative factors affecting the imaging quality of visual systems. These stray lights can form obvious light spots, halos, or hazy backgrounds in the image, which will not only reduce the contrast of the image and make the boundary between the target and the background unclear, but also cover up the details in the image. In severe cases, it can even lead to a decrease in imaging accuracy. Summary of the Invention

[0004] One aspect of this application provides a visual system including a lens barrel, auxiliary lens barrel elements, a lens group assembled within the lens barrel, and an image surface. The visual system includes: a first lens with positive optical power, the first side surface of which is convex; a reflective polarizing element; a first quarter-wave plate, the first side surface of which is at least partially attached to the reflective polarizing element; a second lens with positive optical power, wherein the first side surface of the second lens is at least partially attached to the second side surface of the first quarter-wave plate, the first side surface of the second lens is concave, and the second side surface of the second lens is convex; a second quarter-wave plate; and a polarizer, the first side surface of which is at least partially attached to the second quarter-wave plate, and the second side surface of which is at least partially attached to the image surface. The lens group further includes a first spacer element located between the first lens and the second lens. The visual system satisfies the following conditions: 2.40 < CT1 / Lb < 4.55; 1.05 < L / (CTR+CTQ1+CT2) < 1.75; 3.30 < (f1+f2) / (d1s+d1m) < 4.20; where CT1 is the center thickness of the first lens, Lb is the maximum height of the auxiliary lens barrel element, L is the maximum height of the lens barrel, CTR is the center thickness of the reflective polarizing element, CTQ1 is the center thickness of the first quarter-wave plate, CT2 is the center thickness of the second lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, d1s is the inner diameter of the first side surface of the first spacer element, and d1m is the inner diameter of the second side surface of the first spacer element.

[0005] According to an embodiment of this application, the radius of curvature R1 of the first side surface of the first lens and the inner diameter d0bs of the first side surface of the auxiliary lens element satisfy: 1.15 < R1 / d0bs < 2.55.

[0006] According to the embodiments of this application, the outer diameter D0bs of the first side surface of the auxiliary lens element, the inner diameter d0bs of the first side surface of the auxiliary lens element, and the maximum height Lb of the auxiliary lens element satisfy: 2.40≤(D0bs-d0bs) / Lb≤6.99.

[0007] According to an embodiment of this application, the maximum thickness CP1 of the first spacer element and the axial distance T12 from the second side surface of the first lens to the first side surface of the second lens satisfy: 0.70≤CP1 / T12≤1.73.

[0008] According to an embodiment of this application, the inner diameter d0m of the second side surface of the lens barrel, the outer diameter D0m of the second side surface of the lens barrel, and the radius of curvature R4 of the second side surface of the second lens satisfy: -1.70<(d0m+D0m) / R4<-1.10.

[0009] According to an embodiment of this application, the axial distance TD between the first side surface of the first lens and the second side surface of the second lens, and the distance EPb1 between the first side surface of the auxiliary lens element and the first side surface of the first spacer element along the optical axis direction, satisfy: 2.73≤TD / EPb1≤5.00.

[0010] According to an embodiment of this application, the radius of curvature R2 of the second side surface of the first lens and the outer diameter D1s of the first side surface of the first spacer element first satisfy: 2.55 < |R2| / D1s < 7.40.

[0011] According to the embodiments of this application, the effective focal length f of the visual system, the distance EP01 between the first side surface of the lens barrel and the first side surface of the first spacer element along the optical axis, and the maximum thickness CP1 of the first spacer element satisfy: 2.50 < f / (EP01+CP1) < 3.50.

[0012] According to an embodiment of this application, the inner diameter d0s of the first side surface of the lens barrel and the axial distance TD from the first side surface of the first lens to the second side surface of the second lens satisfy: 2.00 < d0s / TD < 2.60.

[0013] According to an embodiment of this application, the radius of curvature R3 of the first side surface of the second lens and the outer diameter D1m of the second side surface of the first spacer element satisfy: -5.60 < R3 / D1m < -2.00.

[0014] According to the embodiments of this application, the center thickness CT1 of the first lens, the outer diameter D0bm of the second side surface of the auxiliary lens element, and the inner diameter d0bm of the second side surface of the auxiliary lens element satisfy: 1.20 < CT1 / (D0bm - d0bm) < 3.95.

[0015] According to an embodiment of this application, the outer diameter D0s of the first side surface of the lens barrel and the inner diameter d0bs of the first side surface of the auxiliary lens barrel element satisfy: 1.25 < D0s / d0bs < 1.45.

[0016] According to an embodiment of this application, the effective focal length f1 of the first lens and the inner diameter d0bm of the second side surface of the auxiliary lens element satisfy: 2.45 < f1 / d0bm < 2.90.

[0017] Another aspect of this application provides an electronic device including the visual system provided in any embodiment of this application.

[0018] According to the technical solution of this application embodiment, under the conditions of 2.40 < CT1 / Lb < 4.55 and 1.05 < L / (CTR+CTQ1+CT2) < 1.75, stray light interference is easily generated between the first lens and the second lens in the visual system. Therefore, this application, by constraining 3.30 < (f1+f2) / (d1s+d1m) < 4.20 and reasonably designing the focal length of the first lens, the second lens, and the inner diameter of the first spacer element, can significantly reduce stray light spots and improve the clarity and contrast of the visual system image. At this time, the target in the center of the image is clear, with only a very small amount of weak stray light at the extreme edges, and the light spots are almost invisible. The overall image is clean, with high contrast and complete detail. When it is below the lower limit of (f1+f2) / (d1s+d1m), a large number of diffuse stray light spots are distributed outside the target area in the center of the image. The light spots are large in area and high in brightness, and some areas have overlapping light spots, blurring the target outline. When the upper limit of (f1+f2) / (d1s+d1m) is exceeded, dense dot-like stray lights appear at the edges and around the image surface. The number of light spots is large and the distribution is uneven, resulting in poor overall image transparency and serious loss of details. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0020] Figure 1 The image shows a spot pattern of the visual system provided in at least one embodiment of this application when CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=2.7.

[0021] Figure 2 The image shows a spot pattern of the visual system provided in at least one embodiment of this application when CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=3.9.

[0022] Figure 3The image shows a spot pattern with CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=4.6 provided in at least one embodiment of this application;

[0023] Figure 4 A schematic diagram showing the dimensions of a visual system according to this application is provided.

[0024] Figure 5 Example 1 is shown. A schematic diagram of the visual system of Figure 1;

[0025] Figure 6 Example 1 is shown. A schematic diagram of the visual system in Figure 2;

[0026] Figure 7 Example 1 is shown. A schematic diagram of the visual system of Figure 3;

[0027] Figure 8 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 1 is shown;

[0028] Figure 9 Example 2 is shown. A schematic diagram of the visual system of Figure 1;

[0029] Figure 10 Example 2 is shown. A schematic diagram of the visual system in Figure 2;

[0030] Figure 11 Example 2 is shown. A schematic diagram of the visual system of Figure 3;

[0031] Figure 12 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 2 is shown;

[0032] Figure 13 Example 3 is shown. A schematic diagram of the visual system of Figure 1;

[0033] Figure 14 Example 3 is shown. A schematic diagram of the visual system in Figure 2;

[0034] Figure 15 Example 3 is shown. A schematic diagram of the visual system of Figure 3; and

[0035] Figure 16 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 3 is shown. Detailed Implementation

[0036] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] It should be noted that in this specification, the terms "first," "second," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens, and the second lens may also be referred to as the first lens.

[0038] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0039] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region.

[0040] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0041] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The features, principles and other aspects of this application are described in detail below.

[0044] A visual system according to an exemplary embodiment of this application includes a lens barrel, auxiliary lens barrel elements, a lens assembly and an image surface mounted within the lens barrel. The lens assembly includes a first lens, a reflective polarizing element, a first quarter-wave plate, a second lens, a first spacer element, a second quarter-wave plate, and a polarizer. The first lens, reflective polarizing element, first quarter-wave plate, second lens, second quarter-wave plate, and polarizer are arranged sequentially along the optical axis from a first side to a second side. The first spacer element is located between the first lens and the second lens to space them apart. The first lens has positive optical power, and its first side surface is convex; the second lens also has positive optical power. The first side surface of the first quarter-wave plate is at least partially attached to the reflective polarizing element; the first side surface of the second lens is at least partially attached to the second side surface of the first quarter-wave plate; the first side surface of the second lens is concave, and the second side surface of the second lens is convex; the first side surface of the polarizer is at least partially attached to the second quarter-wave plate, and the second side surface of the polarizer is at least partially attached to the image surface. The visual system satisfies the following conditions: 2.40 < CT1 / Lb < 4.55; 1.05 < L / (CTR+CTQ1+CT2) < 1.75; 3.30 < (f1+f2) / (d1s+d1m) < 4.20. CT1 is the center thickness of the first lens, Lb is the maximum height of the auxiliary lens element, L is the maximum height of the lens barrel, CTR is the center thickness of the reflective polarizing element, CTQ1 is the center thickness of the first quarter-wave plate, CT2 is the center thickness of the second lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, d1s is the inner diameter of the first side surface of the first spacer element, and d1m is the inner diameter of the second side surface of the first spacer element.

[0045] The embodiments provided in this application, through reasonable design of the focal lengths of the first lens and the second lens, and the inner diameter of the first spacer element, can significantly reduce stray light spots and improve the clarity and contrast of the visual system's imaging. At this time, the target in the center of the image is clear, with only a very small amount of weak stray light at the extreme edges; the light spots are almost invisible, the overall image is clean, has high contrast, and complete detail. When the value is below the lower limit of (f1+f2) / (d1s+d1m), a large number of diffuse stray light spots are distributed outside the target area in the center of the image. These spots are large in area and high in brightness, and some areas show overlapping spots, blurring the target outline. When the value exceeds the upper limit of (f1+f2) / (d1s+d1m), dense dot-like stray light appears at the edges and around the image surface. The number of spots is large and unevenly distributed, resulting in poor overall image clarity and severe loss of detail.

[0046] In an exemplary embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The visual system can be used, for example, in a VR device. The image surface is, for example, the physical surface in the display of a VR device where pixels emit light, such as an LCD screen or an OLED screen, and is the "starting point" of the light path. Light emitted from the image surface passes through a lens group and enters the human eye, thereby allowing the viewer to see the virtual image.

[0047] In an exemplary embodiment, the auxiliary lens barrel element may be located on the first side of the lens barrel and serves as a mounting mechanism for the lens barrel. For example, the auxiliary lens barrel element may fit against the upper and lower edges of the first lens, acting as a positioning flange for the first lens and the lens barrel to limit the displacement of the first lens.

[0048] In an exemplary embodiment, the first spacer element is located between the first lens and the second lens.

[0049] The second side surface of the polarizer is attached to the image plane, and the first side surface of the polarizer is attached to the second quarter-wave plate.

[0050] In an exemplary embodiment, the visual system of this application may further include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be disposed at an appropriate position in the visual system; for example, the aperture stop can be located between a first side (e.g., the human eye side) and a first lens.

[0051] Figure 1 The image shows a spot pattern of the visual system provided in at least one embodiment of this application when CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=2.7. Figure 2 The image shows a spot pattern of the visual system provided in at least one embodiment of this application when CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=3.9. Figure 3The image shows a spot pattern with CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=4.6 provided in at least one embodiment of this application.

[0052] like Figure 1 As shown, the spot pattern was obtained under the conditions of CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=2.7. Figure 1 In the image, a large number of diffuse stray light spots are distributed outside the central target area. These spots are large in area and high in brightness. In some areas, the spots overlap, blurring the target outline.

[0053] like Figure 2 As shown, the spot pattern was obtained under the conditions of CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=3.9. Figure 2 The central target in the image is clear, with only a very small amount of faint stray light at the very edge. The light spots are almost invisible, and the overall image is clean, with high contrast and complete detail.

[0054] like Figure 3 As shown, the spot pattern was obtained under the conditions of CT1 / Lb=3.5, L / (CTR+CTQ1+CT2)=1.4 and (f1+f2) / (d1s+d1m)=4.6. Figure 3 Dense, dotted stray lights appear at the edges and around the center of the image, with numerous and unevenly distributed light spots, resulting in poor overall image clarity and severe loss of detail.

[0055] Therefore, under the conditions of 2.40 < CT1 / Lb < 4.55 and 1.05 < L / (CTR+CTQ1+CT2) < 1.75, stray light interference is easily generated between the first and second lenses in the visual system. Therefore, this application, by constraining 3.30 < (f1+f2) / (d1s+d1m) < 4.20 and rationally designing the focal lengths of the first and second lenses and the inner diameter of the first spacer element, can significantly reduce stray light spots and improve the clarity and contrast of the visual system image. At this point, the target in the center of the image is clear, with only a very small amount of weak stray light at the extreme edges, and the light spots are almost invisible. The overall image is clean, with high contrast and complete detail.

[0056] In an exemplary embodiment, the radius of curvature R1 of the first side surface of the first lens and the inner diameter d0bs of the first side surface of the auxiliary lens element satisfy the condition: 1.15 < R1 / d0bs < 2.55. This embodiment reasonably controls the conditional range of the radius of curvature R1 of the first side surface of the first lens and the inner diameter d0bs of the first side surface of the auxiliary lens element, which can improve the light-gathering efficiency, enhance the assembly stability of the first lens and the lens barrel, and reduce optical deviation.

[0057] In an exemplary embodiment, the outer diameter D0bs of the first side surface of the auxiliary lens element, the inner diameter d0bs of the first side surface of the auxiliary lens element, and the maximum height Lb of the auxiliary lens element satisfy the condition: 2.40 ≤ (D0bs - d0bs) / Lb ≤ 6.99. This embodiment reasonably controls the conditional range of the outer diameter D0bs of the first side surface of the auxiliary lens element, the inner diameter d0bs of the first side surface of the auxiliary lens element, and the maximum height Lb of the auxiliary lens element. This allows the auxiliary lens element to achieve a lightweight design while ensuring sufficient structural strength, avoiding system redundancy due to excessive lens thickness or deformation caused by excessive thinness. Simultaneously, it allows the wall thickness and height of the auxiliary lens element to be adapted, providing stable support for internal optical components and ensuring the stability of the imaging optical path.

[0058] In an exemplary embodiment, the maximum thickness CP1 of the first spacer element and the axial distance T12 between the second side surface of the first lens and the first side surface of the second lens satisfy the condition: 0.70 ≤ CP1 / T12 ≤ 1.73. This embodiment reasonably controls the conditional range of the maximum thickness CP1 of the first spacer element and the axial distance T12 between the second side surface of the first lens and the first side surface of the second lens, ensuring that the first spacer element has sufficient support strength to stabilize the lens spacing, while also adapting the thickness of the first spacer element to the axial distance between the lenses, thus reducing optical path deviation.

[0059] In an exemplary embodiment, the inner diameter d0m of the second side surface of the lens barrel, the outer diameter D0m of the second side surface of the lens barrel, and the radius of curvature R4 of the second side surface of the second lens satisfy: -1.70 < (d0m + D0m) / R4 < -1.10. This embodiment reasonably controls the conditional range of the inner diameter d0m of the second side surface of the lens barrel, the outer diameter D0m of the second side surface of the lens barrel, and the radius of curvature R4 of the second side surface of the second lens, which can ensure the assembly compatibility between the second lens and the lens barrel and improve imaging stability.

[0060] In an exemplary embodiment, the axial distance TD between the first side surface of the first lens and the second side surface of the second lens, and the distance EPb1 along the optical axis between the first side surface of the auxiliary lens element and the first side surface of the first spacer element, satisfy the condition: 2.73 ≤ TD / EPb1 ≤ 5.00. This embodiment reasonably controls the conditional range of the axial distance TD between the first side surface of the first lens and the second side surface of the second lens, and the distance EPb1 along the optical axis between the first side surface of the auxiliary lens element and the first side surface of the first spacer element, thus providing reasonable installation space for optical components and ensuring the stability of the system structure.

[0061] In an exemplary embodiment, the radius of curvature R2 of the second side surface of the first lens and the outer diameter D1s of the first side surface of the first spacer element satisfy: 2.55 < |R2| / D1s < 7.40. This embodiment reasonably controls the range of the conditional formulas for the radius of curvature R2 of the second side surface of the first lens and the outer diameter D1s of the first side surface of the first spacer element, which can correct spherical aberration and at the same time ensure the coaxiality of the assembly of the first lens and the first spacer element to improve image sharpness.

[0062] In an exemplary embodiment, the effective focal length f of the visual system, the distance EP01 between the first side surface of the lens barrel and the first side surface of the first spacer element along the optical axis, and the maximum thickness CP1 of the first spacer element satisfy the condition: 2.50 < f / (EP01+CP1) < 3.50. This embodiment reasonably controls the conditional range of the effective focal length f of the visual system, the distance EP01 between the first side surface of the lens barrel and the first side surface of the first spacer element along the optical axis, and the maximum thickness CP1 of the first spacer element, which can optimize the light transmission efficiency in the optical path and reduce light energy loss. It can also improve the system's image reproduction accuracy and help achieve high-quality imaging.

[0063] In an exemplary embodiment, the inner diameter d0s of the first side surface of the lens barrel and the axial distance TD from the first side surface of the first lens to the second side surface of the second lens satisfy the condition: 2.00 < d0s / TD < 2.60. This embodiment reasonably controls the conditional range of the inner diameter d0s of the first side surface of the lens barrel and the axial distance TD from the first side surface of the first lens to the second side surface of the second lens, ensuring efficient light entry into the system and a stable transmission path, reducing edge light loss, thereby improving imaging brightness and uniformity, and enhancing the optical performance of the visual system.

[0064] In an exemplary embodiment, the radius of curvature R3 of the first side surface of the second lens and the outer diameter D1m of the second side surface of the first spacer element satisfy: -5.60 < R3 / D1m < -2.00. This embodiment reasonably controls the range of the conditional formulas for the radius of curvature R3 of the first side surface of the two lenses and the outer diameter D1m of the second side surface of the first spacer element, which can optimize the refraction path of light, effectively suppress aberrations such as coma, thereby improving the sharpness of imaging and ensuring the observation quality of the visual system.

[0065] In an exemplary embodiment, the center thickness CT1 of the first lens, the outer diameter D0bm of the second side surface of the auxiliary lens element, and the inner diameter d0bm of the second side surface of the auxiliary lens element satisfy the condition: 1.20 < CT1 / (D0bm - d0bm) < 3.95. This embodiment reasonably controls the conditional range of the center thickness CT1 of the first lens, the outer diameter D0bm of the second side surface of the auxiliary lens element, and the inner diameter d0bm of the second side surface of the auxiliary lens element, balancing the structural stability of the first lens with the support strength of the lens barrel, avoiding lens deformation or lens barrel loosening, thereby ensuring optical path stability and improving the reliability of the visual system imaging.

[0066] In an exemplary embodiment, the outer diameter D0s of the first side surface of the lens barrel and the inner diameter d0bs of the first side surface of the auxiliary lens barrel element satisfy the condition: 1.25 < D0s / d0bs < 1.45. This embodiment reasonably controls the conditional range of the outer diameter D0s of the first side surface of the lens barrel and the inner diameter d0bs of the first side surface of the auxiliary lens barrel element, ensuring the tightness and coaxiality of their assembly, avoiding optical path offset caused by fitting gaps, thereby improving the structural stability of the system and providing reliable support for high-quality imaging.

[0067] In an exemplary embodiment, the effective focal length f1 of the first lens and the inner diameter d0bm of the second side surface of the auxiliary lens element satisfy the condition: 2.45 < f1 / d0bm < 2.90. This embodiment reasonably controls the conditional range of the effective focal length f1 of the first lens and the inner diameter d0bm of the second side surface of the auxiliary lens element, which can optimize the light-gathering effect of the first lens, ensure efficient light transmission to subsequent optical elements, thereby reducing light energy loss and improving the imaging brightness and clarity of the visual system.

[0068] It should be noted that, in the embodiments of this application, the first side surface of each lens or element refers to the side surface away from the image surface, and the second side surface refers to the side surface closer to the image surface.

[0069] Figure 4 A schematic diagram showing the dimensions of a visual system according to this application is provided. Figure 4The figures clearly show the outer diameter D0s of the first side surface of the lens barrel, the inner diameter d0s of the first side surface of the lens barrel, the inner diameter d0bs of the first side surface of the auxiliary lens barrel element, the outer diameter D0bs of the first side surface of the auxiliary lens barrel element, the outer diameter D1s of the first side surface of the first spacer element, the inner diameter d1s of the first side surface of the first spacer element, the outer diameter D0bm of the second side surface of the auxiliary lens barrel element, the inner diameter d0bm of the second side surface of the auxiliary lens barrel element, the outer diameter D1m of the second side surface of the first spacer element, the inner diameter d1m of the second side surface of the first spacer element, the inner diameter d0m of the second side surface of the lens barrel, and the outer diameter D0m of the second side surface of the lens barrel, etc., to clearly and intuitively understand the meaning of these parameters. For ease of description of the visual system and the specific lens shape, these parameters will not be shown in the figures when describing specific embodiments thereafter.

[0070] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters applicable to the visual system described above.

[0071] It should be noted that Example 1 exists in the following Example 1. 1. Example 1 2. Example 1 Three examples in 3, Example 2 contains Example 2. 1. Example 2 2. Example 2 Three examples are given in Example 3, with Example 3 existing in Example 3. 1. Example 3 2. Example 3 Three examples of 3. In the three examples of the visual system in the same embodiment, the parameters of the optical system are the same. Specifically, the parameters such as the radius of curvature, center thickness, etc. of the first lens to the second lens of the visual system, as well as the spacing distance between the lenses and the higher-order coefficients, can be the same. However, the parameters shown, such as the thickness, inner diameter, and outer diameter of the lens barrel and the first spacer element, are different.

[0072] It should be noted that any one of the examples in Embodiments 1 to 3 described below is applicable to all implementations of this application.

[0073] Example 1

[0074] like Figures 5 to 7 As shown, the visual system of Embodiment 1 is described. Figure 5 Example 1 is shown. A schematic diagram of the visual system of Figure 1. Figure 6 Example 1 is shown. A schematic diagram of the visual system in Figure 2. Figure 7 Example 1 is shown. A schematic diagram of the visual system of 3.

[0075] like Figures 5 to 7 As shown, the visual system according to an exemplary embodiment of this application includes a lens barrel P0, an auxiliary lens barrel element P0b, a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a third lens E3, a second quarter-wave plate QWP2, and a polarizer LP, which are sequentially disposed in the lens barrel P0 from the first side to the second side along the optical axis. The visual system also includes a first spacer element P1 disposed between the first lens and the second lens.

[0076] The second side surface of the first quarter-wave plate QWP1 is attached to the first side surface of the second lens. The reflective polarizing element RP is attached to the first side surface of the first quarter-wave plate QWP1, and the first side surface of the reflective polarizing element RP is attached to the second side surface of the first lens E1. The first spacer element P1, for example, abuts against the first lens E1. A partial reflective element BS is also provided on the second side surface of the second lens E2.

[0077] In practical use, the visual system according to the exemplary embodiments of this application can be used as a VR lens, for example, where the first side corresponds to the human eye side and the second side corresponds to the display or image surface side. The second side of the visual system may also have a display or image surface IMG. The second side surface of the polarizer LP is attached to the image surface or display, and the second quarter-wave plate QWP2 is attached to the first side surface of the polarizer LP.

[0078] In the embodiments of this application, the beam emitted from the image plane IMG passes sequentially through the polarizer LP and the second quarter-wave plate QWP2. The polarized light is then transmitted through the second lens E2, and then incident on the reflective polarizing element RP via the first quarter-wave plate QWP1. At the reflective polarizing element RP, the beam is reflected and passes again through the first quarter-wave plate QWP1 and the second lens E2 to reach the partial reflective element BS. Afterward, the beam is reflected again at the partial reflective element BS and passes sequentially through the second lens E2, the first quarter-wave plate QWP1, the reflective polarizing element RP, and the first lens E1 towards the first side (e.g., ...). Figure 5 The light exits at the aperture STO in the image. The visual system provided in this application folds the required optical path without affecting the projection quality by combining light reflection and refraction, effectively shortening the overall length of the visual system.

[0079] like Figure 5 As shown, this is Example 1. A schematic diagram of the visual system of figure 1. For example, an auxiliary lens element P0b is snapped into the lens barrel P0, and one end of the auxiliary lens element P0b abuts against the first lens to restrict the position of the first lens E1. A first spacer element P1 is disposed between the first lens E1 and the second lens E2. In the light transmission path, from the first side to the second side, the system sequentially includes: a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a second quarter-wave plate QWP2, a polarizer LP, and an image plane IMG.

[0080] like Figure 6 As shown, this is Example 1. A schematic diagram of the visual system in Figure 2. In this example, the structure of the visual system is similar to that in the embodiment above, and will not be described again here.

[0081] like Figure 7 As shown, this is Example 1. A schematic diagram of the visual system in Figure 3. In this example, the structure of the visual system is similar to that of the embodiment described above, and will not be repeated here.

[0082] Figures 5 to 7 In the visual system, the optical parameters are the same, but the structural parameters are different, that is, the dimensions of some structural parameters of the lens barrel, auxiliary lens barrel element and first spacer element in the visual system are different.

[0083] The visual system of Embodiment 1 in Embodiment 1 1. Example 1 2. Example 1 The basic parameters for step 3 are shown in Table 1 (unit: mm).

[0084] Table 1

[0085]

[0086] In this embodiment, the second side surface of the second lens is an aspherical surface, and the surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0087]

[0088] in, For an aspherical surface along the optical axis at a height of h When the position is such that the distance from the vertex of the aspherical surface is the sag; c For the paraxial curvature of an aspherical surface, c =1 / R (i.e., paraxial curvature) c (The reciprocal of the radius of curvature R in Table 1 above). k The conic coefficient; Ai Is it an aspherical first i-th order correction coefficients. Table 2 below shows the higher-order coefficients A4, A6, A8, A9, and A10 that can be used for the aspherical mirrors S3, S7, S16-S17 in this embodiment. 10 A 12 A 14 A 16 A 18 and A 20 .

[0089] Table 2

[0090]

[0091] Figure 8 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 1 is shown.

[0092] Figure 8 As shown in the astigmatism curves, the deviations between the meridional curve and the sagittal curve are relatively small, therefore, the astigmatism is relatively small. Figure 8 As shown in the distortion curve, the deviation is small, which ensures that there is no obvious distortion in the image.

[0093] Example 2

[0094] like Figures 9 to 11 As shown, the visual system of Embodiment 2 is described. Figure 9 Example 2 is shown. A schematic diagram of the visual system of Figure 1. Figure 10 Example 2 is shown. A schematic diagram of the visual system in Figure 2. Figure 11 Example 2 is shown. A schematic diagram of the visual system of 3.

[0095] like Figures 9 to 11 As shown, the visual system according to an exemplary embodiment of this application includes a lens barrel P0, an auxiliary lens barrel element P0b, a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a third lens E3, a second quarter-wave plate QWP2, and a polarizer LP, which are sequentially disposed in the lens barrel P0 from the first side to the second side along the optical axis. The visual system also includes a first spacer element P1 disposed between the first lens and the second lens.

[0096] The components included in the visual system are similar to those described above; please refer to the description above.

[0097] In the embodiments of this application, the beam emitted from the image plane IMG passes sequentially through the polarizer LP and the second quarter-wave plate QWP2. The polarized light is then transmitted through the second lens E2, and then incident on the reflective polarizing element RP via the first quarter-wave plate QWP1. At the reflective polarizing element RP, the beam is reflected and passes again through the first quarter-wave plate QWP1 and the second lens E2 to reach the partial reflective element BS. Afterward, the beam is reflected again at the partial reflective element BS and passes sequentially through the second lens E2, the first quarter-wave plate QWP1, the reflective polarizing element RP, and the first lens E1 towards the first side (e.g., ...). Figure 9 The light exits at the aperture STO in the image. The visual system provided in this application folds the required optical path without affecting the projection quality by combining light reflection and refraction, effectively shortening the overall length of the visual system.

[0098] like Figure 9 As shown, this is Example 2. A schematic diagram of the visual system of figure 1. For example, an auxiliary lens element P0b is snapped into the lens barrel P0, and one end of the auxiliary lens element P0b abuts against the first lens to restrict the position of the first lens E1. A first spacer element P1 is disposed between the first lens E1 and the second lens E2. In the light transmission path, from the first side to the second side, the system sequentially includes: a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a second quarter-wave plate QWP2, a polarizer LP, and an image plane IMG.

[0099] like Figure 10 As shown, this is Example 2. A schematic diagram of the visual system in Figure 2. The structure of this visual system is similar to that of the embodiment described above, and will not be repeated here.

[0100] like Figure 11 As shown, this is Example 2. A schematic diagram of the visual system of figure 3. Further details are omitted here.

[0101] Figures 9 to 11 In the visual system, the optical parameters are the same, but the structural parameters are different, that is, the dimensions of some structural parameters of the lens barrel, auxiliary lens barrel element and first spacer element in the visual system are different.

[0102] The visual system in Example 2 1. Example 2 2. Example 2 The basic parameters for step 3 are shown in Table 3 (unit: mm).

[0103] Table 3

[0104]

[0105] In this embodiment, the second side surface of the second lens is an aspherical surface, and the surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0106]

[0107] in, For an aspherical surface along the optical axis at a height of h When the position is such that the distance from the vertex of the aspherical surface is the sag; c For the paraxial curvature of an aspherical surface, c =1 / R (i.e., paraxial curvature) c (The reciprocal of the radius of curvature R in Table 3 above). k The conic coefficient; Ai Is it an aspherical first i -th order correction coefficients. Table 4 below shows the higher-order term coefficients A4, A6, A8, A16, and A17 that can be used for each aspherical mirror S3, S7, S16-S17 in this embodiment. 10 A 12 A 14 A 16 A 18 and A 20 .

[0108] Table 4

[0109]

[0110] Figure 12 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 2 is shown.

[0111] Figure 12 As shown in the astigmatism curves, the deviations between the meridional curve and the sagittal curve are relatively small, therefore, the astigmatism is relatively small. Figure 12 As shown in the distortion curve, the deviation is small, which ensures that there is no obvious distortion in the image.

[0112] Example 3

[0113] like Figures 13 to 15 As shown, the visual system of Embodiment 3 is described. Figure 13 Example 3 is shown. A schematic diagram of the visual system of Figure 1. Figure 14 Example 3 is shown. A schematic diagram of the visual system in Figure 2. Figure 15 Example 3 is shown. A schematic diagram of the visual system of 3.

[0114] like Figures 13 to 15As shown, the visual system according to an exemplary embodiment of this application includes a lens barrel P0, an auxiliary lens barrel element P0b, a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a third lens E3, a second quarter-wave plate QWP2, and a polarizer LP, which are sequentially disposed in the lens barrel P0 from the first side to the second side along the optical axis. The visual system also includes a first spacer element P1 disposed between the first lens and the second lens.

[0115] The components included in the visual system are similar to those described above; please refer to the description above.

[0116] In the embodiments of this application, the beam emitted from the image plane IMG passes sequentially through the polarizer LP and the second quarter-wave plate QWP2. The polarized light is then transmitted through the second lens E2, and then incident on the reflective polarizing element RP via the first quarter-wave plate QWP1. At the reflective polarizing element RP, the beam is reflected and passes again through the first quarter-wave plate QWP1 and the second lens E2 to reach the partial reflective element BS. Afterward, the beam is reflected again at the partial reflective element BS and passes sequentially through the second lens E2, the first quarter-wave plate QWP1, the reflective polarizing element RP, and the first lens E1 towards the first side (e.g., ...). Figure 13 The light exits at the aperture STO in the image. The visual system provided in this application folds the required optical path without affecting the projection quality by combining light reflection and refraction, effectively shortening the overall length of the visual system.

[0117] like Figure 13 As shown, this is Example 3. A schematic diagram of the visual system of figure 1. For example, an auxiliary lens element P0b is snapped into the lens barrel P0, and one end of the auxiliary lens element P0b abuts against the first lens to restrict the position of the first lens E1. A first spacer element P1 is disposed between the first lens E1 and the second lens E2. In the light transmission path, from the first side to the second side, the system sequentially includes: a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a second quarter-wave plate QWP2, a polarizer LP, and an image plane IMG.

[0118] like Figure 14 As shown, this is Example 3. A schematic diagram of the visual system in Figure 2. The structure of this visual system is similar to that of the embodiment described above, and will not be repeated here.

[0119] like Figure 15 As shown, this is Example 3. A schematic diagram of the visual system of figure 3. Further details are omitted here.

[0120] Figures 13 to 15In the visual system, the optical parameters are the same, but the structural parameters are different, that is, the dimensions of some structural parameters of the lens barrel, auxiliary lens barrel element and first spacer element in the visual system are different.

[0121] The visual system in Example 3 1. Example 3 2. Example 3 The basic parameters for step 3 are shown in Table 5 (unit: mm).

[0122] Table 5

[0123]

[0124] In this embodiment, the first side surface of the first lens and the second side surface of the second lens are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0125]

[0126] in, For an aspherical surface along the optical axis at a height of h When the position is such that the distance from the vertex of the aspherical surface is the sag; c For the paraxial curvature of an aspherical surface, c =1 / R (i.e., paraxial curvature) c (The reciprocal of the radius of curvature R in Table 5 above). k The conic coefficient; Ai Is it an aspherical first i -th order correction coefficients. Table 6 below shows the higher-order term coefficients A4, A6, A8, A16, and A17 that can be used for each aspherical mirror S3, S7, S16-S17 in this embodiment. 10 A 12 A 14 A 16 A 18 and A 20 .

[0127] Table 6

[0128]

[0129] Figure 16 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 3 is shown.

[0130] Figure 16 As shown in the astigmatism curves, the deviations between the meridional curve and the sagittal curve are relatively small, therefore, the astigmatism is relatively small. Figure 16 As shown in the distortion curve, the deviation is small, which ensures that there is no obvious distortion in the image.

[0131] The optical parameters of the visual systems in Examples 1, 2, and 3 are shown in Table 7 (unit: mm). The structural parameters of the visual systems in Examples 1, 2, and 3 are shown in Table 8 (unit: mm). The conditional expressions satisfied by the visual systems in Examples 1, 2, and 3 are shown in Table 9. In Tables 7-9, 1-1, 1-2, and 1-3 correspond to Examples 1-1, 1-2, and 1-3 in Example 1, respectively; 2-1, 2-2, and 2-3 correspond to Examples 2-1, 2-2, and 2-3 in Example 2, respectively; and 3-1, 3-2, and 3-3 correspond to Examples 3-1, 3-2, and 3-3 in Example 3, respectively.

[0132] Table 7

[0133]

[0134] Table 8

[0135]

[0136] Table 9

[0137]

[0138] Furthermore, this application also provides an electronic device that includes the visual system provided in any embodiment of this application. This electronic device is, for example, a VR device, which may include the visual system provided in any of the above embodiments, with the first side being the human eye side and the second side being the display / image surface side.

[0139] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A visual system, comprising a lens barrel, auxiliary lens barrel elements, a lens group assembled within the lens barrel, and an image surface, characterized in that, The lens group comprises, sequentially from the first side to the second side along the optical axis: A first lens having positive optical power, wherein the first side surface of the first lens is convex; Reflective polarizing element; A first quarter-wave plate, wherein a first side surface of the first quarter-wave plate is at least partially attached to a reflective polarizing element; A second lens having positive optical power, wherein the first side surface of the second lens is at least partially in contact with the second side surface of the first quarter-wave plate, the first side surface of the second lens is concave, and the second side surface of the second lens is convex; Second quarter-wave plate; A polarizer, wherein a first side surface of the polarizer is at least partially attached to a second quarter-wave plate, and a second side surface of the polarizer is at least partially attached to an image plane; The lens group further includes a first spacer element located between the first lens and the second lens. The visual system satisfies the following: 2.40<CT1 / Lb<4.55; 1.05<L / (CTR+CTQ1+CT2)<1.75; 3.30<(f1+f2) / (d1s+d1m)<4.20; Wherein, CT1 is the center thickness of the first lens, Lb is the maximum height of the auxiliary lens element, L is the maximum height of the lens barrel, CTR is the center thickness of the reflective polarizing element, CTQ1 is the center thickness of the first quarter-wave plate, CT2 is the center thickness of the second lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, d1s is the inner diameter of the first side surface of the first spacer element, and d1m is the inner diameter of the second side surface of the first spacer element.

2. The visual system according to claim 1, characterized in that, The radius of curvature R1 of the first side surface of the first lens and the inner diameter d0bs of the first side surface of the auxiliary lens element satisfy: 1.15 < R1 / d0bs < 2.

55.

3. The visual system according to claim 1, characterized in that, The outer diameter D0bs of the first side surface of the auxiliary lens element, the inner diameter d0bs of the first side surface of the auxiliary lens element, and the maximum height Lb of the auxiliary lens element satisfy the following: 2.40≤(D0bs-d0bs) / Lb≤6.

99.

4. The visual system according to claim 1, characterized in that, The maximum thickness CP1 of the first spacer element and the axial distance T12 from the second side surface of the first lens to the first side surface of the second lens satisfy the following: 0.70≤CP1 / T12≤1.

73.

5. The visual system according to claim 1, characterized in that, The inner diameter d0m of the second side surface of the lens barrel, the outer diameter D0m of the second side surface of the lens barrel, and the radius of curvature R4 of the second side surface of the second lens satisfy the following: -1.70<(d0m+D0m) / R4<-1.

10.

6. The visual system according to claim 1, characterized in that, The axial distance TD between the first side surface of the first lens and the second side surface of the second lens, and the distance EPb1 between the first side surface of the auxiliary lens element and the first side surface of the first spacer element along the optical axis direction, satisfy the following: 2.73≤TD / EPb1≤5.

00.

7. The visual system according to claim 1, characterized in that, The radius of curvature R2 of the second side surface of the first lens and the outer diameter D1s of the first side surface of the first spacer element satisfy: 2.55 < |R2| / D1s < 7.

40.

8. The visual system according to claim 1, characterized in that, The effective focal length f of the visual system, the distance EP01 between the first side surface of the lens barrel and the first side surface of the first spacer element along the optical axis, and the maximum thickness CP1 of the first spacer element satisfy the following: 2.50 < f / (EP01+CP1) < 3.

50.

9. The visual system according to claim 1, characterized in that, The inner diameter d0s of the first side surface of the lens barrel and the axial distance TD from the first side surface of the first lens to the second side surface of the second lens satisfy the following: 2.00 < d0s / TD < 2.

60.

10. The visual system according to claim 1, characterized in that, The radius of curvature R3 of the first side surface of the second lens and the outer diameter D1m of the second side surface of the first spacer element satisfy: -5.60 < R3 / D1m < -2.

00.

11. The visual system according to claim 1, characterized in that, The center thickness CT1 of the first lens, the outer diameter D0bm of the second side surface of the auxiliary lens element, and the inner diameter d0bm of the second side surface of the auxiliary lens element satisfy the following: 1.20<CT1 / (D0bm-d0bm)<3.

95.

12. The visual system according to claim 1, characterized in that, The outer diameter D0s of the first side surface of the lens barrel and the inner diameter d0bs of the first side surface of the auxiliary lens barrel element satisfy the following: 1.25 < D0s / d0bs < 1.

45.

13. The visual system according to claim 1, characterized in that, The effective focal length f1 of the first lens and the inner diameter d0bm of the second side surface of the auxiliary lens element satisfy: 2.45 < f1 / d0bm < 2.

90.

14. An electronic device comprising a visual system according to any one of claims 1-13.

Images