Visual optical system

Abstract

This application discloses a visual optical system, including a lens group, a plurality of support members, and a lens barrel for accommodating the lens group and the plurality of support members. The lens group, along the optical axis from a first side to a second side, sequentially includes: a first lens with positive optical power, wherein the near-optical axis region of its first side is concave and the near-optical axis region of its second side is convex; a second lens with positive optical power, wherein its first side is planar, wherein a quarter-wave plate and a reflective polarizing element are sequentially disposed on the first side of the second lens, and a partially reflective layer is disposed on the second side of the second lens; and a third lens with optical power. The plurality of support members include: a first support member located on the first side of the second lens and partially in contact with the first side of the second lens; and a second support member located on the first side of the third lens and partially in contact with the first side of the third lens. The visual optical system satisfies: 10.0 < (f23 + f) / (EP01 + EP12) < 14.8.

Description

Technical Field

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

[0002] Virtual Reality (VR) and Augmented Reality (AR), based on computer science and interwoven with multiple disciplines such as graphics processing and optical display, are breaking through the limitations of traditional space. AR and VR are computer-generated, interactive, and immersive three-dimensional visual virtual environments. They can integrate diverse information to create dynamic three-dimensional scenes and generate various virtual environments as needed, playing an important role in many fields such as entertainment, urban planning, driver training, and interior design.

[0003] Since the concept of the "metaverse" was proposed, AR / VR has ushered in its second opportunity for development. Visual optical systems, as the entry point for human-computer interaction in AR / VR devices, play a crucial role. At the same time, users are placing more stringent demands on the projection quality and user experience of visual optical systems.

[0004] Current visual optical systems generally suffer from drawbacks such as large size, heavy weight, and the ability to cause dizziness. Therefore, miniaturization, lightweighting, and high projection quality have become paramount factors in improving the consumer experience. How to eliminate the shortcomings of current visual optical systems, improve projection quality and manufacturability, and reduce overall system length by rationally setting the optical power and surface shape of optical components such as lenses, appropriately matching optical components and support structures, and setting the main technical parameters of the optical system, has become one of the urgent challenges for many visual optical system designers. Summary of the Invention

[0005] This application provides a visual optical system. The visual optical system includes: a lens group, a plurality of support members, and a lens barrel for accommodating the lens group and the plurality of support members. The lens group, along the optical axis from a first side to a second side, sequentially includes: a first lens with positive optical power, wherein the near-optical axis region of its first side is concave and the near-optical axis region of its second side is convex; a second lens with positive optical power, wherein its first side is planar, wherein a quarter-wave plate and a reflective polarizing element are sequentially disposed on the first side of the second lens, and a partially reflective layer is disposed on the second side of the second lens; and a third lens with optical power. The plurality of support members include: a first support member located on the first side of the second lens and in partial contact with the first side of the second lens; and a second support member located on the first side of the third lens and in partial contact with the first side of the third lens. The visual optical system can satisfy: 10.0 < (f23 + f) / (EP01 + EP12) < 14.8, where f23 is the combined focal length of the second and third lenses, f is the total effective focal length of the visual optical system, EP01 is the distance between the first side end of the lens barrel and the first side of the first support member along the optical axis, and EP12 is the distance between the second side of the first support member and the first side of the second support member along the optical axis.

[0006] In one embodiment, at least one of the mirror surfaces of the first side surface of the first lens to the second side surface of the third lens is an aspherical mirror surface.

[0007] In one embodiment, the visual optical system may satisfy: 2.5 < F2 / EP12 < 4.0, where F2 is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the second lens, and EP12 is the distance between the second side of the first support member and the first side of the second support member along the optical axis.

[0008] In one embodiment, the visual optical system may satisfy: -4.8 < f1 / R2 / (CT1 / EP01) < -2.5, where f1 is the effective focal length of the first lens, R2 is the radius of curvature of the second side surface of the first lens, CT1 is the center thickness of the first lens on the optical axis, and EP01 is the distance between the first side end of the lens barrel and the first side surface of the first support member in the direction along the optical axis.

[0009] In one embodiment, the visual optical system may satisfy: 10.0 < f23 / (EP12+CT3) < 15.8, where f23 is the combined focal length of the second lens and the third lens, EP12 is the distance between the second side of the first support member and the first side of the second support member along the optical axis, and CT3 is the center thickness of the third lens along the optical axis.

[0010] In one embodiment, the visual optical system can satisfy: -2.0 < (R4 + R5) / (d2s + d2m) < 1.0, where R4 is the radius of curvature of the second side surface of the second lens, R5 is the radius of curvature of the first side surface of the third lens, d2s is the inner diameter of the first side surface of the second support member, and d2m is the inner diameter of the second side surface of the second support member.

[0011] In one embodiment, the visual optical system can satisfy: 1.5 < d2s / D0s × N1 < 2.5, where d2s is the inner diameter of the first side of the second support member, D0s is the outer diameter of the first side end of the lens barrel, and N1 is the refractive index of the first lens.

[0012] In one embodiment, the first side surface of the third lens is convex; and the visual optical system can satisfy: 62.0 < CP2 / T23 < 88.5, where CP2 is the maximum thickness of the second support member and T23 is the air gap between the second lens and the third lens on the optical axis.

[0013] In one embodiment, the visual optical system can satisfy: 21.5 < f23 / (CP1+CP2) < 31.0, where f23 is the combined focal length of the second lens and the third lens, CP1 is the maximum thickness of the first support member, and CP2 is the maximum thickness of the second support member.

[0014] In one embodiment, the visual optical system can satisfy: 1.2 < L / (CTRP+CTQWP+CT2) < 2.2, where L is the maximum height of the lens barrel, CTRP is the center thickness of the reflective polarizing element on the optical axis, CTQWP is the center thickness of the quarter-wave plate on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0015] In one embodiment, the visual optical system can satisfy: 32.0 mm < d2s / ((NRP+NQWP) / N2) < 34.0 mm, where d2s is the inner diameter of the first side of the second support member, NRP is the refractive index of the reflective polarizing element, NQWP is the refractive index of the quarter-wave plate, and N2 is the refractive index of the second lens.

[0016] In one embodiment, the visual optical system can satisfy: 15.0mm < TD / (d0m / d0s) < 18.5mm, where TD is the distance on the optical axis from the first side surface of the first lens to the second side surface of the third lens, d0s is the inner diameter of the first side end of the lens barrel, and d0m is the inner diameter of the second side end of the lens barrel.

[0017] In one embodiment, the plurality of bearing members further includes an auxiliary bearing member located on a first side of the first lens and in contact with a portion of the first side surface of the first lens. The visual optical system can satisfy: R1 / R2 / dbs < 5.0mm-1 Where R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, and dbs is the inner diameter of the first side surface of the auxiliary support member.

[0018] In one embodiment, the first side of the auxiliary support member is in at least partial contact with the inner wall of the lens barrel, and the visual optical system can satisfy: 1.5 < f1 / dbm < 2.5, where f1 is the effective focal length of the first lens and dbm is the inner diameter of the second side of the auxiliary support member.

[0019] In one embodiment, the visual optical system may satisfy: 0.9 < EPb1 / (CT1+T12) < 1.5, where EPb1 is the distance between the second side of the auxiliary support member and the first side of the first support member along the optical axis, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

[0020] In one embodiment, the first and second sides of the reflective polarizing element are both planar; and the first and second sides of the quarter-wave plate are both planar.

[0021] In one embodiment, the visual optical system may satisfy: d0m / d0s≥1.55, where d0s is the inner diameter of the first side end of the lens barrel and d0m is the inner diameter of the second side end of the lens barrel.

[0022] In the exemplary embodiments of this application, by reasonably setting the three lenses, the optical power and surface shape of each lens, the reflective polarizing element, the quarter-wave plate, the partial reflective layer, the support component, and the lens barrel, and by combining 10.0 < (f23 + f) / (EP01 + EP12) < 14.8, the visual optical system provided by this application can have characteristics such as good projection quality, small total length, and high manufacturability. For example, by setting the optical power of each lens and setting the near-optical axis region of the first lens as a meniscus, it is beneficial to allow light to pass smoothly through the first lens, thereby improving the projection quality of the visual optical system; by setting the first side of the second lens as a plane, it is beneficial to attach the reflective polarizing element and the quarter-wave plate to the first side of the second lens; by controlling 10.0 < (f23 + f) / (EP01 + EP12) < 14.8, it is beneficial to ensure that the light in the system has good optical performance before and after reflection, and it is also beneficial to compress the total length of the system as much as possible to achieve structural compactness, and it also makes the lens barrel and the second lens more manufacturable. Attached Figure Description

[0023] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figures 1A to 1C These are schematic diagrams of the visual optical system under three different implementation methods in Example 1;

[0025] Figures 2A to 2C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual optical system of Example 1 are shown respectively.

[0026] Figures 3A to 3C These are schematic diagrams of the visual optical system under three implementation methods in Example 2;

[0027] Figures 4A to 4C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual optical system of Example 2 are shown respectively.

[0028] Figures 5A to 5C These are schematic diagrams of the visual optical system under three different implementation methods in Example 3;

[0029] Figures 6A to 6C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the visual optical system of Example 3 are shown respectively.

[0030] Figure 7 This is a schematic diagram of some parameters of the visual optical system according to an embodiment of this application;

[0031] Figure 8 This is a partially enlarged schematic diagram of a visual optical system according to an embodiment of this application; and

[0032] Figure 9 This is a schematic diagram of the light path in a visual optical system according to an embodiment of this application. Detailed Implementation

[0033] 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.

[0034] It should be noted that in this specification, the terms "first," "second," "third," 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 or the third lens, and the first support member may also be referred to as the second support member.

[0035] 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.

[0036] In this document, the axial region refers to the region adjacent to 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 axial 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 axial region. The first side refers to, for example, the side closer to the user's eye, and the second side refers to, for example, the side closer to the display screen, where the display screen may have an image source surface. The surface of each lens closest to the first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens. It should be understood that the surface of each support member closest to the second side is called the second side surface of the support member, and the surface of each support member closest to the first side is called the first side surface of the support member. The surface of the lens barrel closest to the second side is called the second side end of the lens barrel, and the surface of the lens barrel closest to the first side is called the first side end of the lens barrel.

[0037] 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.

[0038] 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 the 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.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the lens group, lens barrel structure, and support member in each embodiment of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel structure, support member, etc. of that embodiment. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] The features, principles and other aspects of this application are described in detail below.

[0041] A visual optical system according to an exemplary embodiment of this application may include three lenses with optical power, namely a first lens, a second lens, and a third lens. These three lenses are arranged sequentially along the optical axis from the first side to the second side. Any two adjacent lenses among the first to third lenses may have a gap distance between them.

[0042] According to an exemplary embodiment of this application, each of the first to third lenses may have an optical region for optical imaging and a non-optical region extending outward from the outer periphery of the optical region. Generally speaking, the optical region refers to the area of ​​the lens used for optical imaging, while the non-optical region is the structural area of ​​the lens. During the assembly of the visual optical system, support members can be provided at the non-optical regions of each lens using processes such as adhesive bonding, and each lens can be connected to the lens barrel. During the projection process of the visual optical system, the optical regions of each lens can transmit light from the second side to form an optical path, forming the final optical image; while the non-optical regions of each assembled lens are housed in the lens barrel, which cannot transmit light, thus the non-optical regions do not directly participate in the projection process of the visual optical system. It should be noted that, for ease of description, this application describes each lens as divided into two parts: an optical region and a non-optical region. However, it should be understood that the optical region and the non-optical region of the lens can be formed as a whole during the manufacturing process, rather than as two separate parts.

[0043] A visual optical system according to an exemplary embodiment of this application may include at least one of a first support member, a second support member, and an auxiliary support member. Exemplarily, the first support member may be located on a first side of a second lens and partially contact a first side surface of the second lens; the second support member may be located on a first side of a third lens and partially contact a first side surface of the third lens; and the auxiliary support member may be located on a first side of the first lens and partially contact a first side surface of the first lens. Exemplarily, the first support member may contact a non-optical region of the first side surface of the second lens, and simultaneously contact a non-optical region of the second side surface of the first lens. For example, the second side surface of the first support member may contact a non-optical region of the first side surface of the second lens, and the first side surface of the first support member may contact a non-optical region of the second side surface of the first lens. Similarly, the second side surface of the second support member may contact a non-optical region of the first side surface of the third lens, and the first side surface of the second support member may contact a non-optical region of the second side surface of the second lens.

[0044] A visual optical system according to an exemplary embodiment of this application may include a lens barrel housing a lens group and multiple support members. Exemplarily, the lens barrel may be a one-piece lens barrel. Exemplarily, the first support member, the second support member, and the auxiliary support member may each include at least one spacer. By reasonably setting the number, thickness, inner diameter, and outer diameter of the spacers, it is beneficial to improve the assembly of the visual optical system, to block stray light, and to improve the projection quality of the visual optical system.

[0045] In an exemplary implementation, such as Figure 8 As shown, the visual optical system according to this application further includes a reflective polarizing element RP and a quarter-wave plate QWP located on the first side of the second lens E2. The quarter-wave plate QWP can be attached to the first side of the second lens E2. The reflective polarizing element RP can be attached to the surface of the quarter-wave plate QWP. In other words, the second side of the quarter-wave plate QWP can be attached to the first side of the second lens E2. The second side of the reflective polarizing element RP can be attached to the first side of the quarter-wave plate QWP.

[0046] In an exemplary implementation, such as Figure 9 As shown, the visual optical system according to this application also includes a partially reflective layer BS attached to the second side of the second lens E2. The partially reflective layer BS can be a semi-reflective and semi-transparent film, that is, it can be configured to allow a portion of the light to pass through while the other portion of the light is reflected.

[0047] In an exemplary implementation, such as Figure 9As shown, the visual optical system according to this application also includes an aperture STO disposed on the first side and a display screen S9 disposed on the second side. The user's eyes can view the image projected by the display screen S9 at the position of the aperture STO. That is, the image light on the display screen S9 is finally projected to the user's eyes after multiple refractions and reflections through the third lens E3, the partial reflective layer BS, the second lens E2, the quarter-wave plate QWP, the reflective polarizing element RP, and the first lens E1.

[0048] This application, by reasonably setting up a reflective polarizing element RP, a quarter-wave plate QWP, a partial reflective layer BS, and multiple lenses such as the first lens E1, the second lens E2, and the third lens E3, can compress the length of the lens group required for system projection without affecting the projection quality by utilizing light reflection and / or refraction.

[0049] According to exemplary embodiments of this application, such as Figure 9 As shown, the image light emitted by the light source can exit from the display screen S9 on the second side and pass sequentially through the third lens E3 and the second lens E2 to the first side of the quarter-wave plate QWP, where it is reflected to form the first reflected image light. The first reflected image light passes through the quarter-wave plate QWP to the partial reflective layer BS of the second lens E2, where it is reflected again to form the second reflected image light. The second reflected image light passes sequentially through the second lens E2, the quarter-wave plate QWP, the reflective polarizing element RP, and the first lens E1 to the aperture stop STO (i.e., the position where the user's eye views the image). This application can fold the required optical path by combining light reflection and refraction, effectively shortening the length of the visual optical system.

[0050] In an exemplary embodiment, the first lens may have positive optical power, and the near-optical axis region of its first side may be concave, while the near-optical axis region of its second side may be convex; the second lens may have positive optical power, and its first side may be planar.

[0051] In an exemplary embodiment, the visual optical system according to this application can satisfy: 10.0 < (f23 + f) / (EP01 + EP12) < 14.8, where f23 is the combined focal length of the second lens and the third lens, f is the total effective focal length of the visual optical system, EP01 is the distance between the first side end of the lens barrel and the first side of the first support member along the optical axis, and EP12 is the distance between the second side of the first support member and the first side of the second support member along the optical axis.

[0052] This application, through the reasonable arrangement of three lenses, the optical power and surface shape of each lens, the reflective polarizing element, the quarter-wave plate, the partial reflective layer, the supporting component, and the lens barrel, and by combining 10.0 < (f23 + f) / (EP01 + EP12) < 14.8, enables the visual optical system provided by this application to have characteristics such as good projection quality, small overall length, and high manufacturability. For example, by setting the optical power of each lens and setting the near-optical axis region of the first lens as a meniscus, it is beneficial to allow light to pass smoothly through the first lens, thereby improving the projection quality of the visual optical system; by setting the first side of the second lens as a plane, it is beneficial to attach the reflective polarizing element and the quarter-wave plate to the first side of the second lens; by controlling 10.0 < (f23 + f) / (EP01 + EP12) < 14.8, it is beneficial to ensure that the light in the system has good optical performance before and after reflection, and it is also beneficial to compress the overall length of the system as much as possible to achieve structural compactness, and it also makes the lens barrel and the second lens more manufacturable.

[0053] In an exemplary embodiment, the visual optical system according to this application satisfies: 2.5 < F2 / EP12 < 4.0, where F2 is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the second lens, and EP12 is the distance between the second side of the first support member and the first side of the second support member along the optical axis. Satisfying 2.5 < F2 / EP12 < 4.0 allows for the control of the contribution of the second lens aberration by reasonably allocating the combined focal length of the reflective polarizing element, the quarter-wave plate, and the second lens, thus partially canceling out the aberrations generated by other lenses and keeping the system aberrations within a reasonable range. Simultaneously, by controlling the distance between the first and second support members, the edge thickness of the second lens can be effectively controlled, giving the second lens a better forming structure and assembly stability within a certain range.

[0054] In an exemplary embodiment, the visual optical system according to this application satisfies: -4.8 < f1 / R2 / (CT1 / EP01) < -2.5, where f1 is the effective focal length of the first lens, R2 is the radius of curvature of the second side surface of the first lens, CT1 is the center thickness of the first lens on the optical axis, and EP01 is the distance between the first side end of the lens barrel and the first side surface of the first support member along the optical axis. Satisfying -4.8 < f1 / R2 / (CT1 / EP01) < -2.5 can reasonably limit the structural shape of the first lens, thereby helping to reduce the optical sensitivity of the first lens and improve the assembly performance yield.

[0055] In an exemplary embodiment, the visual optical system according to this application satisfies: 10.0 < f23 / (EP12+CT3) < 15.8, where f23 is the combined focal length of the second and third lenses, EP12 is the distance between the second side of the first support member and the first side of the second support member along the optical axis, and CT3 is the center thickness of the third lens along the optical axis. Satisfying 10.0 < f23 / (EP12+CT3) < 15.8 allows the edge thickness of the second lens and the center thickness of the third lens to be controlled within a certain range. Simultaneously, by controlling the combined focal length of the second and third lenses, while meeting optical performance requirements, it is beneficial to make the overall structure of the visual optical system more compact and to reduce the manufacturing difficulty of the second and third lenses.

[0056] In an exemplary embodiment, the visual optical system according to this application satisfies: -2.0 < (R4 + R5) / (d2s + d2m) < 1.0, where R4 is the radius of curvature of the second side surface of the second lens, R5 is the radius of curvature of the first side surface of the third lens, d2s is the inner diameter of the first side surface of the second support member, and d2m is the inner diameter of the second side surface of the second support member. Satisfying -2.0 < (R4 + R5) / (d2s + d2m) < 1.0 allows for reasonable control of the light path near the second and third lenses. Simultaneously, by controlling the inner diameters of the first and second sides of the second support member, stray light generated by the second and third lenses can be effectively blocked, thereby improving the imaging quality of the system.

[0057] In an exemplary embodiment, the visual optical system according to this application satisfies: 1.5 < d2s / D0s × N1 < 2.5, where d2s is the inner diameter of the first side of the second support member, D0s is the outer diameter of the first side end of the lens barrel, and N1 is the refractive index of the first lens. Satisfying 1.5 < d2s / D0s × N1 < 2.5 allows for effective control of the optical power of the first lens by controlling its refractive index, resulting in better imaging performance and a larger image plane for the entire visual optical system. It also facilitates the use of low-stress materials for the first lens.

[0058] In an exemplary embodiment, the first side surface of the third lens is convex. The visual optical system according to this application satisfies: 62.0 < CP2 / T23 < 88.5, where CP2 is the maximum thickness of the second support member, and T23 is the air gap between the second and third lenses on the optical axis. Satisfying 62.0 < CP2 / T23 < 88.5 allows for a relatively large thickness of the second support member, thereby ensuring its strength. Simultaneously, it ensures that the thickness of the second support member is not excessive. Given a fixed air gap between the second and third lenses on the optical axis, it ensures the edge thickness of the second and third lenses, thus guaranteeing their manufacturability.

[0059] In an exemplary embodiment, the visual optical system according to this application satisfies: 21.5 < f23 / (CP1+CP2) < 31.0, where f23 is the combined focal length of the second and third lenses, CP1 is the maximum thickness of the first support member, and CP2 is the maximum thickness of the second support member. By satisfying 21.5 < f23 / (CP1+CP2) < 31.0, the compactness of the visual optical system can be improved by reasonably allocating the maximum thicknesses of the first and second support members. Simultaneously, by reasonably controlling the combined focal length of the second and third lenses, their edge thickness can be controlled within a certain range while ensuring the optical performance of the second and third lenses, thus guaranteeing a certain degree of manufacturability.

[0060] In an exemplary embodiment, the visual optical system according to this application satisfies: 1.2 < L / (CTRP+CTQWP+CT2) < 2.2, where L is the maximum height of the lens barrel, CTRP is the center thickness of the reflective polarizing element on the optical axis, CTQWP is the center thickness of the quarter-wave plate on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. Satisfying 1.2 < L / (CTRP+CTQWP+CT2) < 2.2 allows for reasonable limitation of the thickness of the reflective polarizing element and the quarter-wave plate, which is beneficial for improving the transmittance of the reflective polarizing element and the quarter-wave plate, reducing their haze, and thus improving the imaging quality of the entire visual optical system.

[0061] In an exemplary embodiment, the visual optical system according to this application satisfies the following condition: 32.0 mm < d2s / ((NRP+NQWP) / N2) < 34.0 mm, where d2s is the inner diameter of the first side of the second support member, NRP is the refractive index of the reflective polarizing element, NQWP is the refractive index of the quarter-wave plate, and N2 is the refractive index of the second lens. Satisfying 32.0 mm < d2s / ((NRP+NQWP) / N2) < 34.0 mm reasonably limits the refractive indices of the reflective polarizing element, the quarter-wave plate, and the second lens, facilitating their selection and preventing a significant difference in refractive indices from reducing the imaging quality of the visual optical system.

[0062] In an exemplary embodiment, the visual optical system according to this application satisfies the following condition: 15.0 mm < TD / (d0m / d0s) < 18.5 mm, where TD is the distance on the optical axis from the first side surface of the first lens to the second side surface of the third lens, d0s is the inner diameter of the first side end of the lens barrel, and d0m is the inner diameter of the second side end of the lens barrel. Satisfying 15.0 mm < TD / (d0m / d0s) < 18.5 mm allows for control over the overall dimensions of the visual optical system, thereby minimizing the overall system size and improving the user experience. Simultaneously, it keeps the axial and radial dimensions of the system within a certain proportional range, which is beneficial for improving the stability and reliability of the visual optical system.

[0063] In an exemplary embodiment, the visual optical system according to this application satisfies the following condition: R1 / R2 / dbs < 5.0mm -1 Where R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, and dbs is the inner diameter of the first side surface of the auxiliary support. The condition R1 / R2 / dbs < 5.0 mm must be met. -1 The optical power of the first lens can be limited by controlling the radius of curvature of the first lens, so that its light direction is better. By setting auxiliary support components, the support of the first lens can be made more stable.

[0064] In an exemplary embodiment, the first side of the auxiliary support member is at least partially in contact with the inner wall of the lens barrel. The visual optical system according to this application satisfies: 1.5 < f1 / dbm < 2.5, where f1 is the effective focal length of the first lens, and dbm is the inner diameter of the second side of the auxiliary support member. Satisfying 1.5 < f1 / dbm < 2.5 effectively controls the focal length of the first lens, thereby helping to constrain the direction of light and avoiding the problem of excessive sensitivity of the first lens caused by excessively steep light paths.

[0065] In an exemplary embodiment, the visual optical system according to this application satisfies the following condition: 0.9 < EPb1 / (CT1+T12) < 1.5, where EPb1 is the distance between the second side of the auxiliary support member and the first side of the first support member along the optical axis, CT1 is the center thickness of the first lens along the optical axis, and CT2 is the center thickness of the second lens along the optical axis. By satisfying 0.9 < EPb1 / (CT1+T12) < 1.5, the ratio of the center thickness to the edge thickness of the first lens can be effectively controlled within a reasonable range by reasonably allocating the center thickness of the first lens and the distance between the second side of the auxiliary support member and the first side of the first support member along the optical axis, thus ensuring the manufacturability of the first lens.

[0066] In an exemplary embodiment, both the first and second sides of the reflective polarizing element are planar; and both the first and second sides of the quarter-wave plate are planar. By setting both sides of the reflective polarizing element and the quarter-wave plate to be planar, this application facilitates the bonding of the reflective polarizing element and the quarter-wave plate to the surface of the second lens while controlling light reflection and changes in light state.

[0067] In an exemplary embodiment, the visual optical system according to this application satisfies the following condition: d0m / d0s ≥ 1.55, where d0s is the inner diameter of the first side end of the lens barrel and d0m is the inner diameter of the second side end of the lens barrel. Satisfying d0m / d0s ≥ 1.55 allows for reasonable control of the structural shape of the inner wall of the lens barrel, avoiding excessively large differences between the inner diameters of the second and first sides of the lens barrel, thereby improving its manufacturability.

[0068] In an exemplary embodiment, the visual optical system according to this application may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the second side.

[0069] The visual optical system according to the above embodiments of this application can employ multiple lenses, such as the three lenses mentioned above. By rationally allocating the structure of each lens and the on-axis spacing between them, the size of the visual optical system can be effectively reduced and its manufacturability improved, making it more suitable for manufacturing and portable electronic products. The visual optical system configured as described above features small size, light weight, good assembly stability, less stray light, high manufacturability, compact structure, and good projection quality, which can well meet the usage requirements of various portable electronic products in projection scenarios. In the visual optical system of the above embodiments of this application, by setting a support member between adjacent lenses and designing the inner and outer diameters of the support member according to the optical path, stray light can be effectively blocked and eliminated, improving the imaging quality of the visual optical system.

[0070] In embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface; that is, at least one mirror surface from the first side surface of the first lens to the second side surface of the third lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during projection can be eliminated as much as possible, thereby improving projection quality. Optionally, at least one of the first and second side surfaces of each of the first, second, and third lenses is an aspherical mirror surface. Optionally, the second side surface of the second lens, and the first and second side surfaces of the first and third lenses are all aspherical mirror surfaces.

[0071] However, those skilled in the art will understand that the number of lenses constituting the visual optical system can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although three lenses are described as an example in the embodiments, the visual optical system is not limited to including three lenses. If desired, the visual optical system may also include other numbers of lenses.

[0072] Specific embodiments of the visual optical system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0073] Example 1

[0074] The following is for reference Figures 1A to 2C A visual optical system according to Embodiment 1 of this application is described. Figures 1A to 1C The visual optical systems in three different implementations of Example 1 are shown respectively.

[0075] like Figures 1A to 1C The visual optical system includes, from the first side to the second side, the following components in sequence: aperture STO (not shown), first lens E1, reflective polarizing element RP, quarter-wave plate QWP, second lens E2, partial reflective layer BS, third lens E3, and display screen S9.

[0076] The first lens E1 has positive optical power, with its first side surface S1 being concave and its second side surface S2 being convex. The second lens E2 has positive optical power, with its first side surface S5 being planar and its second side surface S6 being convex. The third lens E3 has positive optical power, with its first side surface S7 being convex and its second side surface S8 being concave. A quarter-wave plate QWP is attached to the first side surface S5 of the second lens E1. A reflective polarizing element RP is attached to the first side surface of the quarter-wave plate QWP. A partial reflective layer BS is attached to the second side surface S6 of the second lens E2.

[0077] In this example, a light source may be provided on the display screen S9. Image light from the display screen S9 sequentially passes through the third lens E3, the second lens E2, and reaches the first side of the quarter-wave plate QWP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP and reaches the partial reflective layer BS on the second side of the second lens E2, where it undergoes a second reflection. The light after the second reflection sequentially passes through the second lens E2, the quarter-wave plate QWP, the reflective polarizing element RP, and the first lens E1, and is finally projected onto a target object (not shown) in space. For example, when this visual optical system is mounted on an electronic device such as VR, the light after the two reflections is finally projected into the eyes of the user.

[0078] Table 1 shows the basic parameters of the visual optical system of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0079]

[0080] Table 1

[0081] In this example, the effective focal length f1 of the first lens is 91.145 mm, the effective focal length f2 of the second lens is 231.132 mm, the effective focal length f3 of the third lens is 1220.790 mm, the total effective focal length f of the visual optical system is 28.717 mm, the combined focal length F2 of the reflective polarizing element, quarter-wave plate and second lens is 35.653 mm, and half of the maximum field of view (Semi-FOV) of the visual optical system is 53°.

[0082] like Figures 1A to 1C As shown, the visual optical system may include three support components: an auxiliary support component P0b, a first support component P1, and a second support component P2. The visual optical system may also include a lens barrel P0 that houses a first lens E1, a second lens E2, a third lens E3, the auxiliary support component P0b, the first support component P1, and the second support component P2.

[0083] Table 2 shows the structural parameters of each support component under three implementations of the visual optical system of Embodiment 1, wherein the unit of each structural parameter in Table 2 is millimeters (mm).

[0084] Structural parameters Implementation Method 1 Implementation Method 2 Implementation Method 3 d2s 66.338 66.338 66.338 d2m 68.014 68.014 68.014 dbs 43.221 43.221 43.221 dbm 43.221 43.221 43.221 d0s 44.510 44.510 44.510 d0m 74.406 74.406 74.406 D0s 50.506 50.506 50.506 EP01 10.366 10.738 10.738 CP1 0.100 0.100 0.100 EP12 11.499 11.127 12.244 CP2 7.493 7.493 6.224 EPb1 8.366 8.738 8.738 L 32.308 32.308 32.308

[0085] Table 2

[0086] It should be understood that this example only exemplifies the structure and parameters of each support component under three implementation methods, and does not explicitly limit the specific structure and actual parameters of each support component. In actual production, the specific structure and actual parameters of each support component can be set in any suitable manner.

[0087] In Embodiment 1, the second side surface of the second lens E2, the first side surface of the first lens E1, and the second side surface of the third lens E3 are all aspherical surfaces. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0088]

[0089] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the conic coefficient k and higher-order coefficients A4, A6, A8 and A1 that can be used for each aspherical mirror in Example 1. 10 .

[0090] Face number A4 A6 A8 A10 k S1 -4.61E-01 9.27E-03 8.57E-03 2.84E-03 0.0000 S2 -2.30E-01 1.53E-01 -2.10E-02 -8.32E-03 0.0000 S6 -7.11E-02 -1.16E-02 8.33E-04 1.27E-04 0.0000 S7 5.90E-01 -3.02E-01 3.98E-02 4.44E-02 0.0000 S8 -1.80E+00 4.45E-01 -9.24E-02 2.25E-02 0.0000

[0091] Table 3

[0092] Figure 2A The on-axis chromatic aberration curve of the visual optical system of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the visual optical system. Figure 2B The astigmatism curves of the visual optical system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 2C The distortion curves of the visual optical system of Embodiment 1 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 2A to 2C It can be seen that the visual optical system given in Example 1 can achieve good imaging quality.

[0093] Example 2

[0094] The following is for reference Figures 3A to 4C A visual optical system according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figures 3A to 3C The visual optical systems in three different implementations of Example 2 are shown respectively.

[0095] like Figures 3A to 3C , Figure 8As shown, the visual optical system includes, from the first side to the second side, the following components in sequence: aperture STO (not shown), first lens E1, reflective polarizing element RP, quarter-wave plate QWP, second lens E2, partial reflective layer BS, third lens E3, and display screen S9.

[0096] The first lens E1 has positive optical power, with its first side surface S1 being concave and its second side surface S2 being convex. The second lens E2 has positive optical power, with its first side surface S5 being planar and its second side surface S6 being convex. The third lens E3 has positive optical power, with its first side surface S7 being convex and its second side surface S8 being concave. A quarter-wave plate QWP is attached to the first side surface S5 of the second lens E1. A reflective polarizing element RP is attached to the first side surface of the quarter-wave plate QWP. A partial reflective layer BS is attached to the second side surface S6 of the second lens E2.

[0097] In this example, a light source may be provided on the display screen S9. Image light from the display screen S9 sequentially passes through the third lens E3, the second lens E2, and reaches the first side of the quarter-wave plate QWP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP and reaches the partial reflective layer BS on the second side of the second lens E2, where it undergoes a second reflection. The light after the second reflection sequentially passes through the second lens E2, the quarter-wave plate QWP, the reflective polarizing element RP, and the first lens E1, and is finally projected onto a target object (not shown) in space. For example, when this visual optical system is mounted on an electronic device such as VR, the light after the two reflections is finally projected into the eyes of the user.

[0098] In this example, the effective focal length f1 of the first lens is 90.487 mm, the effective focal length f2 of the second lens is 231.978 mm, the effective focal length f3 of the third lens is 1328.611 mm, the total effective focal length f of the visual optical system is 28.000 mm, the combined focal length F2 of the reflective polarizing element, quarter-wave plate and second lens is 35.318 mm, and half of the maximum field of view (Semi-FOV) of the visual optical system is 53°.

[0099] like Figures 3A to 3C As shown, the visual optical system may include three support components: an auxiliary support component P0b, a first support component P1, and a second support component P2. The visual optical system may also include a lens barrel P0 that houses a first lens E1, a second lens E2, a third lens E3, the auxiliary support component P0b, the first support component P1, and the second support component P2.

[0100] It should be understood that this example only exemplifies the structure and parameters of each support component under three implementation methods, and does not explicitly limit the specific structure and actual parameters of each support component. In actual production, the specific structure and actual parameters of each support component can be set in any suitable manner.

[0101] Table 4 shows the basic parameters of the visual optical system of Embodiment 2, where the units of radius of curvature and thickness / distance are millimeters (mm). Table 5 shows the structural parameters of each support component under the three implementations of the visual optical system of Embodiment 2, where the units of each structural parameter in Table 5 are millimeters (mm). Table 6 shows the conic coefficient and higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, where each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0102]

[0103] Table 4

[0104]

[0105]

[0106] Table 5

[0107] Face number A4 A6 A8 A10 k S1 -1.65E-01 4.50E-02 -2.54E-03 -1.20E-03 0.0000 S2 1.41E+00 6.93E-01 -1.44E-01 -7.73E-03 0.0000 S6 1.60E-02 -1.92E-02 2.92E-03 -9.66E-05 0.0000 S7 4.33E-01 -3.92E-01 9.94E-02 4.34E-02 0.0000 S8 4.62E-01 2.11E-01 -3.03E-02 -6.12E-02 0.0000

[0108] Table 6

[0109] Figure 4A The on-axis chromatic aberration curve of the visual optical system of Embodiment 2 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the visual optical system. Figure 4B The astigmatism curves of the visual optical system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 4C The distortion curves of the visual optical system of Embodiment 2 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 4A to 4C It can be seen that the visual optical system given in Example 2 can achieve good imaging quality.

[0110] Example 3

[0111] The following is for reference Figures 5A to 6C A visual optical system according to Embodiment 3 of this application is described. Figures 5A to 5C The visual optical systems in three different implementations of Example 3 are shown respectively.

[0112] like Figures 5A to 3CAs shown, the visual optical system includes, from the first side to the second side, the following components in sequence: aperture STO (not shown), first lens E1, reflective polarizing element RP, quarter-wave plate QWP, second lens E2, partial reflective layer BS, third lens E3, and display screen S9.

[0113] The first lens E1 has positive optical power, with its first side surface S1 being concave and its second side surface S2 being convex. The second lens E2 has positive optical power, with its first side surface S5 being planar and its second side surface S6 being convex. The third lens E3 has positive optical power, with its first side surface S7 being concave and its second side surface S8 being convex. A quarter-wave plate QWP is attached to the first side surface S5 of the second lens E1. A reflective polarizing element RP is attached to the first side surface of the quarter-wave plate QWP. A partial reflective layer BS is attached to the second side surface S6 of the second lens E2.

[0114] In this example, a light source may be provided on the display screen S9. Image light from the display screen S9 sequentially passes through the third lens E3, the second lens E2, and reaches the first side of the quarter-wave plate QWP, where it undergoes a first reflection. The light after the first reflection passes through the quarter-wave plate QWP and reaches the partial reflective layer BS on the second side of the second lens E2, where it undergoes a second reflection. The light after the second reflection sequentially passes through the second lens E2, the quarter-wave plate QWP, the reflective polarizing element RP, and the first lens E1, and is finally projected onto a target object (not shown) in space. For example, when this visual optical system is mounted on an electronic device such as VR, the light after the two reflections is finally projected into the eyes of the user.

[0115] In this example, the effective focal length f1 of the first lens is 89.767 mm, the effective focal length f2 of the second lens is 233.549 mm, the effective focal length f3 of the third lens is 496.006 mm, the total effective focal length f of the visual optical system is 29.438 mm, the combined focal length F2 of the reflective polarizing element, quarter-wave plate and second lens is 35.950 mm, and half of the maximum field of view (Semi-FOV) of the visual optical system is 53°.

[0116] like Figures 5A to 5C As shown, the visual optical system may include three support components: an auxiliary support component P0b, a first support component P1, and a second support component P2. The visual optical system may also include a lens barrel P0 that houses a first lens E1, a second lens E2, a third lens E3, the auxiliary support component P0b, the first support component P1, and the second support component P2.

[0117] It should be understood that this example only exemplifies the structure and parameters of each support component under three implementation methods, and does not explicitly limit the specific structure and actual parameters of each support component. In actual production, the specific structure and actual parameters of each support component can be set in any suitable manner.

[0118] Table 7 shows the basic parameters of the visual optical system of Embodiment 3, where the units of radius of curvature and thickness / distance are millimeters (mm). Table 8 shows the structural parameters of each support component under the three implementations of the visual optical system of Embodiment 3, where the units of each structural parameter in Table 8 are millimeters (mm). Table 9 shows the conic coefficient and higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, where each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0119]

[0120] Table 7

[0121]

[0122]

[0123] Table 8

[0124] Face number A4 A6 A8 A10 k S1 3.01E-01 -4.88E-02 8.36E-03 -1.35E-03 0.0000 S2 1.35E-01 5.54E-02 -1.04E-02 -5.73E-03 0.0000 S6 2.35E-02 -9.41E-03 -4.71E-04 2.56E-04 0.0000 S7 -1.24E-01 -4.11E-02 7.79E-03 1.58E-02 0.0000 S8 -1.24E-01 -4.11E-02 7.79E-03 1.58E-02 0.0000

[0125] Table 9

[0126] Figure 6A The on-axis chromatic aberration curve of the visual optical system of Embodiment 3 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the visual optical system. Figure 6B The astigmatism curves of the visual optical system of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 6C The distortion curves of the visual optical system of Embodiment 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. According to... Figures 6A to 6C It can be seen that the visual optical system given in Example 3 can achieve good imaging quality.

[0127] In summary, Examples 1 to 3 can satisfy the relationships shown in Tables 10-1, 10-2 and 10-3, respectively.

[0128]

[0129]

[0130] Table 10-1

[0131]

[0132] Table 10-2

[0133]

[0134]

[0135] Table 10-3

[0136] This application also provides an optical device, which can be a stand-alone projection device such as a projector, or a projection module integrated into a mobile electronic device such as a VR device. This optical device is equipped with the visual optical system described above.

[0137] 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 the invention 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 inventive concept. 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 optical system, characterized in that, The visual optical system includes, sequentially from the first side to the second side along the optical axis, a lens group and a display screen; the visual optical system also includes multiple support members and a lens barrel, the lens barrel being used to house the lens group and the multiple support members; wherein... The lens group comprises, sequentially from the first side to the second side along the optical axis: A first lens with positive optical power has a concave surface on its first side near the optical axis and a convex surface on its second side near the optical axis. A second lens with positive optical power has a first side surface that is planar and a second side surface that is convex in the near-optical axis region. A quarter-wave plate is disposed on the first side surface of the second lens, and a reflective polarizing element is disposed on the first side surface of the quarter-wave plate. A partially reflective layer, which is a semi-reflective and semi-transparent film, is disposed on the second side surface of the second lens. A third lens with positive optical power; The plurality of supporting components include: A first support member is located on a first side of the second lens and partially contacts a first side surface of the second lens; and The second support member is located on the first side of the third lens and is in contact with the first side surface portion of the third lens; The number of lenses with optical power in the visual optical system is three; The visual optical system satisfies: 10.83≤(f23+f) / (EP01+EP12)≤14.40, where f23 is the combined focal length of the second lens and the third lens, f is the total effective focal length of the visual optical system, EP01 is the distance between the first side end of the lens barrel and the first side surface of the first support member along the optical axis, and EP12 is the distance between the second side surface of the first support member and the first side surface of the second support member along the optical axis.

2. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies: 2.83≤F2 / EP12≤3.68, where F2 is the combined focal length of the reflective polarizing element, the quarter-wave plate, and the second lens, and EP12 is the distance between the second side of the first support member and the first side of the second support member along the optical axis.

3. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies: -4.47≤f1 / R2 / (CT1 / EP01)≤-2.69, where f1 is the effective focal length of the first lens, R2 is the radius of curvature of the second side surface of the first lens, CT1 is the center thickness of the first lens on the optical axis, and EP01 is the distance between the first side end of the lens barrel and the first side surface of the first support member along the optical axis.

4. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies: 10.27≤f23 / (EP12+CT3)≤15.40, where f23 is the combined focal length of the second lens and the third lens, EP12 is the distance between the second side of the first support member and the first side of the second support member along the optical axis, and CT3 is the center thickness of the third lens along the optical axis.

5. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies: -1.72≤(R4+R5) / (d2s+d2m)≤0.72, where R4 is the radius of curvature of the second side surface of the second lens, R5 is the radius of curvature of the first side surface of the third lens, d2s is the inner diameter of the first side surface of the second support member, and d2m is the inner diameter of the second side surface of the second support member.

6. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies: 1.83≤d2s / D0s×N1≤1.96, where d2s is the inner diameter of the first side of the second support member, D0s is the outer diameter of the first side end of the lens barrel, and N1 is the refractive index of the first lens.

7. The visual optical system according to claim 1, characterized in that, The first side surface of the third lens is convex; and The visual optical system satisfies: 62.24≤CP2 / T23≤88.03, where CP2 is the maximum thickness of the second support member and T23 is the air gap between the second lens and the third lens on the optical axis.

8. The visual optical system according to claim 7, characterized in that, The visual optical system satisfies: 22.00≤f23 / (CP1+CP2)≤30.65, where f23 is the combined focal length of the second lens and the third lens, CP1 is the maximum thickness of the first support member, and CP2 is the maximum thickness of the second support member.

9. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies: 1.55≤L / (CTRP+CTQWP+CT2)≤2.05, where L is the maximum height of the lens barrel, CTRP is the center thickness of the reflective polarizing element on the optical axis, CTQWP is the center thickness of the quarter-wave plate on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

10. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies the following: 32.92mm≤d2s / ((NRP+NQWP) / N2)≤33.50 mm, where d2s is the inner diameter of the first side of the second support member, NRP is the refractive index of the reflective polarizing element, NQWP is the refractive index of the quarter-wave plate, and N2 is the refractive index of the second lens.

11. The visual optical system according to claim 1, characterized in that, The visual optical system satisfies the following: 15.62mm≤TD / (d0m / d0s)≤18.16 mm, where TD is the distance from the first side surface of the first lens to the second side surface of the third lens on the optical axis, d0s is the inner diameter of the first side end of the lens barrel, and d0m is the inner diameter of the second side end of the lens barrel.

12. The visual optical system according to claim 1, characterized in that, The plurality of support members also include an auxiliary support member located on a first side of the first lens and in contact with a portion of the first side surface of the first lens. The visual optical system satisfies: 0.11 mm -1 ≤R1 / R2 / dbs≤4.76 mm -1 Wherein, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, and dbs is the inner diameter of the first side surface of the auxiliary support member.

13. The visual optical system according to any one of claims 1-11, characterized in that, The plurality of supporting members further includes an auxiliary supporting member located on a first side of the first lens and in contact with a portion of the first side surface of the first lens, wherein... The first side of the auxiliary support member is in at least partial contact with the inner wall of the lens barrel; and The visual optical system satisfies: 1.89≤f1 / dbm≤2.11, where f1 is the effective focal length of the first lens and dbm is the inner diameter of the second side of the auxiliary support member.

14. The visual optical system according to any one of claims 1-11, characterized in that, The plurality of supporting members further includes an auxiliary supporting member located on a first side of the first lens and in contact with a portion of the first side surface of the first lens, wherein... The visual optical system satisfies: 1.02≤EPb1 / (CT1+T12)≤1.33, where EPb1 is the distance between the second side of the auxiliary support member and the first side of the first support member along the optical axis, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.

15. The visual optical system according to any one of claims 1-12, characterized in that, The first and second sides of the reflective polarizing element are both planar; and Both the first and second sides of the quarter-wave plate are planar.

16. The visual optical system according to any one of claims 1-12, characterized in that, The visual optical system satisfies: 1.56≤d0m / d0s≤1.67, where d0s is the inner diameter of the first side end of the lens barrel and d0m is the inner diameter of the second side end of the lens barrel.

Images