Visual system and electronic device
By rationally designing the radius of curvature of the third lens and the inner diameter of the spacer element, the stray light problem in VR devices was solved, improving imaging quality and system performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG SUNNY OPTICAL CO LTD
- Filing Date
- 2026-01-14
- Publication Date
- 2026-07-24
AI Technical Summary
Existing VR headsets with folding-out visual systems are prone to stray light issues near the third lens, affecting image quality.
By rationally designing the radius of curvature of the second side surface of the third lens and the inner diameter of the third spacer element, stray light that deviates towards the third lens is blocked, thus suppressing stray light propagation.
It effectively suppressed the propagation of stray light, improving the imaging quality of VR devices and the optical performance of the system.
Smart Images
Figure CN121679909B_ABST
Abstract
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] Virtual Reality (VR) technology provides users with immersive experiences and can be applied to many fields such as education, entertainment, and healthcare, offering advantages such as enhanced learning outcomes, immersive entertainment experiences, and therapeutic support. As VR technology continues to develop, the mainstream visual system solution for VR headsets has shifted from the Fresnel method to the flexographic method, which offers a shorter overall system length and better display performance. Summary of the Invention
[0003] This application provides a visual system, including a lens barrel and a lens assembly assembled within the lens barrel. The lens assembly sequentially includes, from a first side to a second side, the following along the optical axis: a first lens with positive optical power, wherein a first side surface of the first lens is convex; a reflective polarizing element, wherein a first side surface of the reflective polarizing element is at least partially attached to a second side surface of the first lens; a first quarter-wave plate, wherein a first side surface of the first quarter-wave plate is at least partially attached to a second side surface of the reflective polarizing element; a second lens with positive optical power, wherein a first side surface of the second lens is at least partially attached to a second side surface of the first quarter-wave plate; a third lens with positive optical power, wherein a first side surface of the third lens is at least partially attached to a second side surface of the second lens, and the second side surface of the third lens is convex; and a third spacer element abutting against the third lens. Two side surfaces; a second quarter-wave plate; a polarizer, wherein 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 plane; wherein the visual system satisfies: 1.90 < d0s / EP03 < 2.40 and 3.30 ≤ CT3 / CP3 ≤ 6.04; -3.20 < (d3s + d3m) / R6 < -2.10; wherein d0s is the inner diameter of the first side surface of the lens barrel, EP03 is the distance from the first side surface of the lens barrel to the first side surface of the third spacer element along the optical axis, CT3 is the center thickness of the third lens, CP3 is the maximum thickness of the third spacer element, d3s is the inner diameter of the first side surface of the third spacer element, d3m is the inner diameter of the second side surface of the third spacer element, and R6 is the radius of curvature of the second side surface of the third lens.
[0004] In one embodiment, the center thickness CT1 of the first lens, the outer diameter D0s of the first side surface of the lens barrel, and the inner diameter d0s of the first side surface of the lens barrel satisfy: 0.40 < CT1 / (D0s-d0s) < 1.05.
[0005] In one embodiment, the effective focal length f3 of the third lens and the outer diameter D3s of the first side surface of the third spacer element satisfy: 1.12≤f3 / D3s≤2.80.
[0006] In one embodiment, the effective focal length f2 of the second lens and the maximum height L of the lens barrel satisfy: 6.02≤f2 / L≤9.30.
[0007] In one embodiment, the combined focal length f23 of the second lens and the third lens, and the distance EP03 from the first side surface of the lens barrel to the first side surface of the third spacer element along the optical axis satisfy: 2.35 < f23 / EP03 < 4.55.
[0008] In one embodiment, the sum of the inner diameter d0m of the second side surface of the lens barrel, the center thickness of the first lens, the center thickness of the second lens, and the center thickness of the third lens, ∑CT, satisfies: 2.00 < d0m / ∑CT < 2.40.
[0009] In one embodiment, the outer diameter D0m of the second side surface of the lens barrel, the inner diameter d0m of the second side surface of the lens barrel, and the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis satisfy: 1.15 < (D0m - d0m) / EP3L < 4.15.
[0010] In one embodiment, the outer diameter D3m of the second side surface of the third spacer element and the axial distance TD from the first side surface of the first lens to the second side surface of the third lens satisfy: 1.95≤D3m / TD≤2.30.
[0011] In one embodiment, the maximum height L of the lens barrel, the center thickness CTR of the reflective polarizing element, the center thickness CTQ1 of the first quarter-wave plate, and the center thickness CT2 of the second lens satisfy: 1.85 < L / (CTR+CTQ1+CT2) < 2.30.
[0012] In one embodiment, the maximum height L of the lens barrel and the entrance pupil diameter of the visual system satisfy: 2.80 < L / EPD < 3.90.
[0013] In one embodiment, the effective focal length f of the visual system, the maximum thickness CP3 of the third spacer element, and the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis satisfy: 4.75 < f / (CP3+EP3L) < 10.05.
[0014] In one embodiment, the inner diameter d3s of the first side surface of the third spacer element, the outer diameter D3s of the first side surface of the third spacer element, and the combined focal length f23 of the second lens and the third lens satisfy: 1.17≤(d3s+D3s) / f23≤2.35.
[0015] In one embodiment, the effective focal length f3 of the third lens and the outer diameter D0m of the second side surface of the lens barrel satisfy: 1.03≤f3 / D0m≤2.60.
[0016] The visual system provided in this application exhibits stray light issues near the third lens under the conditions of 1.90 < d0s / EP03 < 2.40 and 3.30 ≤ CT3 / CP3 ≤ 6.04. Therefore, this application addresses this by constraining the range of -3.20 < (d3s + d3m) / R6 < -2.10 and rationally designing the radius of curvature of the second side surface of the third lens and the inner diameter of the third spacer element to block stray light offset towards the third lens, thus directly suppressing stray light propagation at the optical path blocking level. When (d3s + d3m) / R6 is less than -3.20, the inner diameter of the third spacer element is too large and cannot effectively block stray light offset towards the edge of the third lens; when (d3s + d3m) / R6 is greater than -2.10, stray light undergoes multiple reflections between the contact surface of the third lens and the third spacer element, forming diffuse stray light. Attached Figure Description
[0017] 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: Figure 1 The image shows a spot pattern of the visual system provided in at least one embodiment of this application when d0s / EP03=2.2, CT3 / CP3=4.5 and (d3s+d3m) / R6=-1.6. Figure 2 The image shows a spot pattern of the visual system provided in at least one embodiment of this application when d0s / EP03=2.2, CT3 / CP3=4.5 and (d3s+d3m) / R6=-2.6. Figure 3The image shows a spot pattern of the visual system provided in at least one embodiment of this application when d0s / EP03=2.2, CT3 / CP3=4.5 and (d3s+d3m) / R6=-3.9. Figure 4 A schematic diagram showing the dimensions of a visual system according to this application is provided. 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 Figure 3; Figure 8 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 1 is shown; 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 Figure 3; Figure 12 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 2 is shown; 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 Figure 3; and Figure 16 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 3 is shown. Detailed Implementation
[0018] 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.
[0019] 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.
[0020] 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.
[0021] 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.
[0022] 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.
[0023] 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.
[0024] 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.
[0025] The features, principles and other aspects of this application are described in detail below.
[0026] A visual system according to an exemplary embodiment of this application includes a lens barrel and a lens assembly 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 third lens, a third spacer element, a second quarter-wave plate, and a polarizer. The first lens, reflective polarizing element, first quarter-wave plate, second lens, third lens, third spacer element, second quarter-wave plate, and polarizer are arranged sequentially along the optical axis from a first side to a second side. The first lens has positive optical power, and its first side surface is convex; the second lens has positive optical power, the third lens has positive optical power, and its second side surface is convex. The first side surface of the reflective polarizing element is at least partially attached to the second side surface of the first lens; the first side surface of the first quarter-wave plate is at least partially attached to the second side surface of 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 third lens is at least partially attached to the second side surface of the second lens; a third spacer element abuts against the second side surface of the third lens; 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 plane. This visual system satisfies: 1.90 < d0s / EP03 < 2.40 and 3.30 ≤ CT3 / CP3 ≤ 6.04; -3.20 < (d3s + d3m) / R6 < -2.10. d0s is the inner diameter of the first side surface of the lens barrel, EP03 is the distance from the first side surface of the lens barrel to the first side surface of the third spacer element along the optical axis, CT3 is the center thickness of the third lens, CP3 is the maximum thickness of the third spacer element, d3s is the inner diameter of the first side surface of the third spacer element, d3m is the inner diameter of the second side surface of the third spacer element, and R6 is the radius of curvature of the second side surface of the third lens.
[0027] The embodiments provided in this application, by rationally designing the radius of curvature of the second side surface of the third lens and the inner diameter of the third spacer element in the visual system, block stray light that deviates towards the third lens, directly suppressing stray light propagation from the optical path blocking level. When (d3s+d3m) / R6 is less than -3.20, the inner diameter of the third spacer element is too large and cannot effectively block stray light that deviates towards the edge of the third lens; when (d3s+d3m) / R6 is greater than -2.10, the stray light undergoes multiple reflections between the contact surface of the third lens and the third spacer element, forming diffuse reflection stray light.
[0028] 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.
[0029] In an exemplary embodiment, the first side surface of the third lens is cemented to the second side surface of the second lens. That is, the third lens and the second lens form a cemented lens. Alternatively, the first lens, the reflective polarizing element, the first quarter-wave plate, and the second lens can also form a cemented lens. The cemented lens configuration provides the system with a high-quality lens material, offering advantages such as lightweight, good light transmission, and wear resistance, making it more suitable for VR device lens manufacturing and improving lens quality and fit.
[0030] In an exemplary embodiment, a third spacer element is disposed on the second side surface of the third lens.
[0031] 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.
[0032] In an exemplary embodiment, the visual system of this application may 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.
[0033] Figure 1 The image shows a spot pattern of the visual system provided in at least one embodiment of this application when d0s / EP03=2.2, CT3 / CP3=4.5 and (d3s+d3m) / R6=-1.6. Figure 2 The image shows a spot pattern of the visual system provided in at least one embodiment of this application when d0s / EP03=2.2, CT3 / CP3=4.5 and (d3s+d3m) / R6=-2.6. Figure 3 The image shows a spot pattern of a visual system provided in at least one embodiment of this application when d0s / EP03=2.2, CT3 / CP3=4.5 and (d3s+d3m) / R6=-3.9.
[0034] like Figure 1 As shown, the spot pattern was obtained under the conditions of d0s / EP03=2.2, CT3 / CP3=4.5 and (d3s+d3m) / R6=-1.6. Figure 1 The appearance of a "continuously diffused light region" is a characteristic of diffuse stray light. After being scattered by the surface, the light diffuses in multiple directions, thus exhibiting a large-scale, continuous distribution of light energy. As shown in the light spot diagram, when (d3s+d3m) / R6 is greater than -2.10, the stray light undergoes multiple reflections between the contact surface of the third lens and the third spacer element, forming diffuse stray light.
[0035] like Figure 2As shown, this spot pattern was obtained under the conditions of d0s / EP03=2.2, CT3 / CP3=4.5, and (d3s+d3m) / R6=-2.6. As this spot pattern indicates, there is little stray light interference in the image, and the visual system exhibits good imaging quality.
[0036] like Figure 3 As shown, the spot pattern was obtained under the conditions of d0s / EP03=2.2, CT3 / CP3=4.5 and (d3s+d3m) / R6=-3.9. Figure 3 Concentrated bright spots appear in the image; these bright spots are manifestations of stray light energy accumulation. As shown in the image, when (d3s+d3m) / R6 is less than -3.20, the inner diameter of the third spacer element is too large and cannot effectively block stray light that deviates towards the edge of the third lens, resulting in stray light in the visual system.
[0037] Therefore, given that the visual system will generate stray light near the third lens under the conditions of 1.90 < d0s / EP03 < 2.40 and 3.30 ≤ CT3 / CP3 ≤ 6.04, the embodiments of this application, by constraining the range of -3.20 < (d3s + d3m) / R6 < -2.10, rationally design the radius of curvature of the second side surface of the third lens and the inner diameter of the third spacer element, thereby blocking stray light that deviates towards the lens and directly suppressing stray light propagation from the optical path blocking level.
[0038] In an exemplary embodiment, the center thickness CT1 of the first lens, the outer diameter D0s of the first side surface of the lens barrel, and the inner diameter d0s of the first side surface of the lens barrel satisfy the following condition: 0.40 < CT1 / (D0s - d0s) < 1.05. This embodiment reasonably controls the parameter ranges of the center thickness CT1 of the first lens, the outer diameter D0s of the first side surface of the lens barrel, and the inner diameter d0s of the first side surface of the lens barrel, thereby improving the manufacturability of the first lens while ensuring the aforementioned performance.
[0039] In an exemplary embodiment, the effective focal length of the third lens and the outer diameter D3s of the first side surface of the third spacer element satisfy: 1.12 ≤ f3 / D3s ≤ 2.80. This embodiment reasonably controls the parameter range of the effective focal length of the third lens and the outer diameter D3s of the first side surface of the third spacer element, controls the angle at which the light emitted from the screen enters the second lens, and optimizes system performance.
[0040] In an exemplary embodiment, the effective focal length of the second lens and the maximum height L of the lens barrel satisfy the condition: 6.02 ≤ f² / L ≤ 9.30. This embodiment reasonably controls the parameter range of the effective focal length of the second lens and the maximum height L of the lens barrel, ensuring the system performance after optical path folding.
[0041] In an exemplary embodiment, the combined focal length f23 of the second and third lenses and the distance EP03 along the optical axis from the first side surface of the lens barrel to the first side surface of the third spacer element satisfy: 2.35 < f23 / EP03 < 4.55. This embodiment reasonably controls the parameter range of the combined focal length f23 of the second and third lenses and the distance EP03 along the optical axis from the first side surface of the lens barrel to the first side surface of the third spacer element, thereby controlling the position and angle of the light emitted from the screen when it first passes through the film surface, and optimizing system performance.
[0042] In an exemplary embodiment, the inner diameter d0m of the second side surface of the lens barrel, the center thickness of the first lens, the center thickness of the second lens, and the sum of the center thicknesses of the third lens, ∑CT, satisfy: 2.00 < d0m / ∑CT < 2.40. This embodiment reasonably controls the parameter range of the inner diameter d0m of the second side surface of the lens barrel, the center thickness of the first lens, the center thickness of the second lens, and the sum of the center thicknesses of the third lens, ∑CT, ensuring the performance of the visual system while reducing the system thickness, making the system thinner and lighter.
[0043] In an exemplary embodiment, the outer diameter D0m of the second side surface of the lens barrel, the inner diameter d0m of the second side surface of the lens barrel, and the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis satisfy: 1.15 < (D0m - d0m) / EP3L < 4.15. This embodiment reasonably controls the parameter ranges of the outer diameter D0m of the second side surface of the lens barrel, the inner diameter d0m of the second side surface of the lens barrel, and the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis, which can prevent insufficient lens barrel wall thickness and control the positional relationship between the third spacer element and the lens barrel, thus ensuring the feasibility of lens barrel manufacturing.
[0044] In an exemplary embodiment, the outer diameter D3m of the second side surface of the third spacer element and the axial distance TD between the first side surface of the first lens and the second side surface of the third lens satisfy: 1.95 ≤ D3m / TD ≤ 2.30. This embodiment reasonably controls the parameter range of the outer diameter D3m of the second side surface of the third spacer element and the axial distance TD between the first side surface of the first lens and the second side surface of the third lens, which can control the overall thickness of the lens after bonding, reduce the overall size of the system, and make the product thinner and lighter.
[0045] In an exemplary embodiment, the maximum height L of the lens barrel, the center thickness CTR of the reflective polarizing element, the center thickness CTQ1 of the first quarter-wave plate, and the center thickness CT2 of the second lens satisfy the condition: 1.85 < L / (CTR + CTQ1 + CT2) < 2.30. This embodiment reasonably controls the parameter ranges of the maximum height L of the lens barrel, the center thickness CTR of the reflective polarizing element, the center thickness CTQ1 of the first quarter-wave plate, and the center thickness CT2 of the second lens, thereby increasing the optical path of the reflected light and reducing the overall length of the system, making the product thinner and lighter.
[0046] In an exemplary embodiment, the maximum height L of the telescope barrel and the entrance pupil diameter of the visual system satisfy the condition: 2.80 < L / EPD < 3.90. This embodiment reasonably controls the parameter range of the maximum height L of the telescope barrel and the entrance pupil diameter of the visual system, ensuring that the human eye has sufficient space to receive the system image.
[0047] In an exemplary embodiment, the effective focal length f of the visual system, the maximum thickness CP3 of the third spacer element, and the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis satisfy: 4.75 < f / (CP3 + EP3L) < 10.05. This embodiment reasonably controls the parameter range of the effective focal length f of the visual system, the maximum thickness CP3 of the third spacer element, and the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis, ensuring the system's control over the magnification of the screen image and the size of the virtual image distance.
[0048] In an exemplary embodiment, the inner diameter d3s of the first side surface of the third spacer element, the outer diameter D3s of the first side surface of the third spacer element, and the combined focal length f23 of the second and third lenses satisfy: 1.17 ≤ (d3s + D3s) / f23 ≤ 2.35. This embodiment reasonably controls the parameter range of the inner diameter d3s of the first side surface of the third spacer element, the outer diameter D3s of the first side surface of the third spacer element, and the combined focal length f23 of the second and third lenses. By adjusting the light path through the negative focal length combination, the field of view can be expanded while suppressing edge distortion, which is suitable for the wide viewing angle requirements of VR devices. At the same time, it can ensure the mechanical strength of the third spacer element, preventing structural fragility due to excessive size or increased weight due to excessive size.
[0049] In an exemplary embodiment, the effective focal length f3 of the third lens and the outer diameter D0m of the second side surface of the lens barrel satisfy the condition: 1.03 ≤ f3 / D0m ≤ 2.60. This embodiment reasonably controls the parameter range of the effective focal length f3 of the third lens and the outer diameter D0m of the second side surface of the lens barrel, which can reduce light energy loss, make the image plane illumination more uniform, and especially improve the brightness consistency of the edge area; at the same time, it blocks non-imaging light rays, reduces ghosting and glare, and improves contrast.
[0050] Figure 4 A schematic diagram showing the dimensions of a visual system according to this application is provided. Figure 4 The diagram clearly shows the outer diameter D0s of the first side surface of the lens barrel, the outer diameter D3s of the first side surface of the third spacer element, the inner diameter d3s of the first side surface of the third spacer element, the inner diameter d0s of the first side surface of the lens barrel, the inner diameter d3m of the second side surface of the third spacer element, the outer diameter D3m of the second side surface of the third spacer element, 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, the distance EP03 between the first side surface of the lens barrel and the first side surface of the third spacer element along the optical axis, the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis, the maximum height L of the lens barrel, and the maximum thickness CP3 of the third spacer element, 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 accompanying drawings when describing specific embodiments.
[0051] 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.
[0052] 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 third 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 third spacer element, are different.
[0053] 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.
[0054] Example 1 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.
[0055] like Figures 5 to 7 As shown, the visual system according to an exemplary embodiment of this application includes a lens barrel P0 and a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a third lens E3, a third spacer element P3, a second quarter-wave plate QWP2, and a polarizer LP, which are sequentially arranged in the lens barrel P0 from the first side to the second side along the optical axis.
[0056] A first side surface of a reflective polarizing element RP is attached to a second side surface of lens E1, and a first side surface of a first quarter-wave plate QWP1 is attached to a second side surface of the reflective polarizing element RP. Simultaneously, the second side surface of the first quarter-wave plate QWP1 is attached to a first side surface of the second lens. For example, the second lens E2 and the third lens E3 form a cemented lens. A third spacer element P3 abuts against a second side surface of the third lens E3. A partial reflective element BS is disposed between the second lens E2 and the third lens E3.
[0057] 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 first side surface of the polarizer LP is attached to the second quarter-wave plate QWP2.
[0058] In the embodiments of this application, the polarized light emitted from the image plane IMG passes sequentially through the polarizer LP and the second quarter-wave plate QWP2, and then is transmitted sequentially through the third lens E3 and the second lens E2. It then passes through the first quarter-wave plate QWP1 and is incident on the reflective polarizing element RP. At the reflective polarizing element RP, the light 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 light 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.
[0059] like Figure 5 As shown, this is Example 1. A schematic diagram of the visual system of 1. In this example, the third spacer element P3 abuts against the second side surface of the lens E3.
[0060] like Figure 6 As shown, this is Example 1. A schematic diagram of the visual system of figure 2. In this example, the third spacer element P3 abuts against the second side surface of the lens E3. The structure of this visual system is similar to that of the embodiment described above, and will not be repeated here.
[0061] like Figure 7 As shown, this is Example 1. A schematic diagram of the visual system of figure 3. In this example, the third spacer element P3 abuts against the second side surface of the lens E3. The structure of this visual system is similar to that of the embodiment described above, and will not be repeated here.
[0062] Figures 5-7 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 and the third spacer element are different.
[0063] 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).
[0064] Table 1
[0065] In this embodiment, the second side surface of the second lens, the first side surface of the third lens, and the second side surface of the third lens are all aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:
[0066] 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 non-spherical 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 A16 A 18 and A 20 .
[0067] Table 2
[0068] Figure 8 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 1 is shown.
[0069] 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.
[0070] Example 2 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.
[0071] like Figures 9 to 11 As shown, the visual system according to an exemplary embodiment of this application includes a lens barrel P0 and a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a third lens E3, a third spacer element P3, a second quarter-wave plate QWP2, and a polarizer LP, which are sequentially arranged in the lens barrel P0 from the first side to the second side along the optical axis.
[0072] The components included in the visual system are similar to those described above; please refer to the description above.
[0073] In the embodiments of this application, the polarized light emitted from the image plane IMG passes sequentially through the polarizer LP and the second quarter-wave plate QWP2, and then is transmitted sequentially through the third lens E3 and the second lens E2. It then passes through the first quarter-wave plate QWP1 and is incident on the reflective polarizing element RP. At the reflective polarizing element RP, the light 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 light 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 9The 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.
[0074] like Figure 9 As shown, this is Example 2. A schematic diagram of the visual system of 1.
[0075] 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.
[0076] like Figure 11 As shown, this is Example 2. A schematic diagram of the visual system of figure 3. Further details are omitted here.
[0077] Figure 9-11 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 and the third spacer element are different.
[0078] 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).
[0079] Table 3
[0080] In this embodiment, the first side surface of the first lens, the second side surface of the second lens, the first side surface of the third lens, and the second side surface of the third lens are all aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:
[0081] in, Here, is the distance vector from the vertex of the aspherical surface at a height of 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 3 above); k is the conic coefficient; Ai is the i-th order correction coefficient for the aspherical surface. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirrors S3, S7, and S16-S17 in this embodiment.
[0082] Table 4
[0083] Figure 12 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 2 is shown.
[0084] 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.
[0085] Example 3 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.
[0086] like Figures 13 to 15 As shown, the visual system according to an exemplary embodiment of this application includes a lens barrel P0 and a first lens E1, a reflective polarizing element RP, a first quarter-wave plate QWP1, a second lens E2, a third lens E3, a third spacer element P3, a second quarter-wave plate QWP2, and a polarizer LP, which are sequentially arranged in the lens barrel P0 from the first side to the second side along the optical axis.
[0087] The components included in the visual system are similar to those described above; please refer to the description above.
[0088] In the embodiments of this application, the polarized light emitted from the image plane IMG passes sequentially through the polarizer LP and the second quarter-wave plate QWP2, and then is transmitted sequentially through the third lens E3 and the second lens E2. It then passes through the first quarter-wave plate QWP1 and is incident on the reflective polarizing element RP. At the reflective polarizing element RP, the light 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 light 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.
[0089] like Figure 13 As shown, this is Example 3. A schematic diagram of the visual system of 1.
[0090] 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.
[0091] like Figure 15 As shown, this is Example 3. A schematic diagram of the visual system of figure 3. Further details are omitted here.
[0092] Figure 13-15 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 and the third spacer element are different.
[0093] 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).
[0094] Table 5
[0095] In this embodiment, the first side surface of the first lens, the second side surface of the second lens, the first side surface of the third lens, and the second side surface of the third lens are all aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:
[0096] in, Here, is the distance vector from the vertex of the aspherical surface at a height of 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 5 above); k is the conic coefficient; Ai is the i-th order correction coefficient for the aspherical surface. Table 6 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirrors S3, S7, and S16-S17 in this embodiment.
[0097] Table 6
[0098] Figure 16 A schematic diagram of the astigmatism and distortion curves of the visual system according to Embodiment 3 is shown.
[0099] 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 16As shown in the distortion curve, the deviation is small, which ensures that there is no obvious distortion in the image.
[0100] 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.
[0101] Table 7
[0102] Table 8
[0103] Table 9
[0104] 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.
[0105] 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 and a lens assembly assembled within the lens barrel, 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; A reflective polarizing element, wherein a first side surface of the reflective polarizing element is at least partially attached to a second side surface of the first lens; A first quarter-wave plate, wherein a first side surface of the first quarter-wave plate is at least partially attached to a second side surface of a reflective polarizing element; A second lens having positive optical power, wherein a first side surface of the second lens is at least partially in contact with a second side surface of the first quarter-wave plate; A third lens having positive optical power, wherein a first side surface of the third lens is at least partially in contact with a second side surface of the second lens, and the second side surface of the third lens is convex. A third spacer element is disposed against the second side surface of the third lens; 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 visual system satisfies the following: 1.90 < d0s / EP03 < 2.40 and 3.30 ≤ CT3 / CP3 ≤ 6.04; -3.20<(d3s+d3m) / R6<-2.10; Wherein, d0s is the inner diameter of the first side surface of the lens barrel, EP03 is the distance from the first side surface of the lens barrel to the first side surface of the third spacer element along the optical axis, CT3 is the center thickness of the third lens, CP3 is the maximum thickness of the third spacer element, d3s is the inner diameter of the first side surface of the third spacer element, d3m is the inner diameter of the second side surface of the third spacer element, and R6 is the radius of curvature of the second side surface of the third lens.
2. The visual system according to claim 1, characterized in that, The center thickness CT1 of the first lens, the outer diameter D0s of the first side surface of the lens barrel, and the inner diameter d0s of the first side surface of the lens barrel satisfy the following: 0.40<CT1 / (D0s-d0s)<1.
05.
3. The visual system according to claim 1, characterized in that, The effective focal length f3 of the third lens and the outer diameter D3s of the first side surface of the third spacer element satisfy: 1.12≤f3 / D3s≤2.
80.
4. The visual system according to claim 1, characterized in that, The effective focal length f2 of the second lens and the maximum height L of the lens barrel satisfy the following: 6.02≤f2 / L≤9.
30.
5. The visual system according to claim 1, characterized in that, The combined focal length f23 of the second lens and the third lens, and the distance EP03 from the first side surface of the lens barrel to the first side surface of the third spacer element along the optical axis, satisfy the following: 2.35 < f23 / EP03 < 4.
55.
6. The visual system according to claim 1, characterized in that, The sum of the inner diameter d0m of the second side surface of the lens barrel, the center thickness of the first lens, the center thickness of the second lens, and the center thickness of the third lens, ∑CT, satisfies: 2.00 < d0m / ∑CT < 2.
40.
7. The visual system according to claim 1, characterized in that, The outer diameter D0m of the second side surface of the lens barrel, the inner diameter d0m of the second side surface of the lens barrel, and the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis satisfy the following: 1.15<(D0m-d0m) / EP3L<4.
15.
8. The visual system according to claim 1, characterized in that, The outer diameter D3m of the second side surface of the third spacer element and the axial distance TD from the first side surface of the first lens to the second side surface of the third lens satisfy the following: 1.95≤D3m / TD≤2.
30.
9. The visual system according to claim 1, characterized in that, The maximum height L of the lens barrel, the center thickness CTR of the reflective polarizing element, the center thickness CTQ1 of the first quarter-wave plate, and the center thickness CT2 of the second lens satisfy the following: 1.85<L / (CTR+CTQ1+CT2)<2.
30.
10. The visual system according to claim 1, characterized in that, The maximum height L of the lens barrel and the entrance pupil diameter EPD of the visual system satisfy the following: 2.80 < L / EPD < 3.
90.
11. The visual system according to claim 1, characterized in that, The effective focal length f of the visual system, the maximum thickness CP3 of the third spacer element, and the distance EP3L between the second side surface of the third spacer element and the second side surface of the lens barrel along the optical axis satisfy the following: 4.75<f / (CP3+EP3L)<10.
05.
12. The visual system according to claim 1, characterized in that, The inner diameter d3s of the first side surface of the third spacer element, the outer diameter D3s of the first side surface of the third spacer element, and the combined focal length f23 of the second lens and the third lens satisfy the following: 1.17≤(d3s+D3s) / f23≤2.
35.
13. The visual system according to claim 1, characterized in that, The effective focal length f3 of the third lens and the outer diameter D0m of the second side surface of the lens barrel satisfy the following: 1.03≤f3 / D0m≤2.
60.
14. An electronic device comprising a visual system according to any one of claims 1-13.