Visual system

Abstract

The utility model discloses a visual system, which comprises a lens barrel, and a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens and a partial reflection element which are assembled in the lens barrel and are sequentially arranged from a first side to a second side along an optical axis, the second lens has positive focal power and a plano-convex surface type, and the second side surface of the third lens is a convex surface; a first spacing element is arranged between the first lens and the second lens, and a second spacing element is arranged between the second lens and the third lens. The curvature radius R1 of the first side face of the first lens and the outer diameter D0s of the end face of the first side of the lens barrel meet the condition that R1 / D0s is larger than or equal to 1.37 and smaller than or equal to 1.80. The outer diameter D1s and the inner diameter d1s of the first side face of the first spacing element and the center thickness CT1 of the first lens meet the condition that (D1s-d1s) / CT1 is larger than or equal to 0.14 and smaller than or equal to 2.04. The axial distance EP01 from the first side end face of the lens barrel to the first side face of the first spacer element, the maximum thickness CP1 of the first spacer element and the axial distance EP12 of the first spacer element and the second spacer element satisfy 0.99 < = (EP01 + CP1) / EP12 < = 2.47.

Description

Technical Field

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

[0002] Metaverse, as a highly realistic virtual shared space supporting real-time interaction, is gradually becoming one of the important tools for driving teaching innovation in the education field, thanks to its superior information technology support. Among them, AR / VR (Augmented Reality / Virtual Reality) devices with human-computer interaction are developing rapidly and gaining increasing popularity. However, the existing devices generally use a folding optical solution based on optical path deflection, which has problems such as large size, excessive weight, and poor wearing comfort. Furthermore, the surface of the first lens in the optical system is prone to deformation under stress, affecting the overall sensitivity of the lens, as well as the assembly yield and stability, which urgently need to be addressed. Against this background, in order to meet market demands, a vision system needs to be designed to optimize the user's visual experience in the metaverse environment. Utility Model Content

[0003] This application provides a visual system that may include a lens barrel and a lens group and a spacer group assembled within the lens barrel. The lens group includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens, and a partially reflective element arranged sequentially along the optical axis from a first side to a second side. The first lens has positive optical power, with a first convex side and a second convex side; the second lens has positive optical power, with a first planar side and a second convex side; and the third lens has either positive or negative optical power, with a second convex side. The spacer group includes a first spacer element located between the first and second lenses and abutting against a second side of the first lens, and a second spacer element located between the second and third lenses and abutting against a second side of the second lens. The visual system can satisfy the conditions 1.37≤R1 / D0s≤1.80, 0.14≤(D1s-d1s) / CT1≤2.04 and 0.99≤(EP01+CP1) / EP12≤2.47, where R1 is the radius of curvature of the first side of the first lens, D0s is the outer diameter of the first side end face of the lens barrel, D1s is the outer diameter of the first side of the first spacer element, d1s is the inner diameter of the first side of the first spacer element, CT1 is the center thickness of the first lens on the optical axis, EP01 is the distance on the optical axis from the first side end face of the lens barrel to the first side of the first spacer element, CP1 is the maximum thickness of the first spacer element, and EP12 is the distance on the optical axis from the second side of the first spacer element to the first side of the second spacer element.

[0004] In one embodiment, the effective focal length f of the visual system and the inner diameter d0m of the second side end face of the lens barrel and the inner diameter d0s of the first side end face of the lens barrel can satisfy: 2.75≤f / (d0m-d0s)≤4.43.

[0005] In one embodiment, the distance L along the optical axis from the first end face of the lens barrel to the second end face of the lens barrel can satisfy the following condition with respect to the entrance pupil diameter EPD of the visual system: 1.05. <L / EPD<3.0。

[0006] In one embodiment, the distance TD between the first side surface of the first lens and the second side surface of the third lens on the optical axis can satisfy the following condition: 6.15. <TD / CP2<9.65。

[0007] In one embodiment, the effective focal length f3 of the third lens and the inner diameter d2m of the second side of the second spacer element can satisfy: 2.38≤|f3| / d2m≤4.45.

[0008] In one embodiment, the center thickness CT2 of the second lens on the optical axis and the distance EP12 from the second side of the first spacer element to the first side of the second spacer element on the optical axis can satisfy: 1.2 <CT2 / EP12<3.1。

[0009] In one embodiment, the center thickness CT3 of the third lens on the optical axis, the outer diameter D2m of the second side of the second spacer element, and the inner diameter d2m of the second side of the second spacer element can satisfy: 1.9 <CT3 / (D2m-d2m)<4.8。

[0010] In one embodiment, the distance T23 between the second side surface of the second lens and the first side surface of the third lens on the optical axis, the outer diameter D2s of the first side surface of the second spacer element, and the inner diameter d2s of the first side surface of the second spacer element can satisfy: 1.4≤T23 / (D2s-d2s)≤2.65.

[0011] In one embodiment, the inner diameter d1m of the second side of the first spacer element and the dispersion coefficient V2 of the second lens and the refractive index N2 of the second lens can satisfy: 0.9 <d1m / (V2 / N2)<1.1。

[0012] In one embodiment, the outer diameter D0m of the second side end face of the lens barrel and the outer diameter D1m of the second side face of the first spacer element can satisfy: 1.05 <D0m / D1m<1.2。

[0013] In one embodiment, the effective focal length f1 of the first lens and the inner diameter d0s of the first side end face of the lens barrel and the inner diameter d1s of the first side face of the first spacer element can satisfy: 1.0 <f1 / (d0s+d1s)<1.65。

[0014] In one embodiment, the radius of curvature R6 of the second side of the third lens, the radius of curvature R5 of the first side of the third lens, and the maximum thickness CP2 of the second spacer element can satisfy: 0.20mm≤|R6 / R5|×CP2≤3.91mm.

[0015] In one embodiment, the distance L on the optical axis from the first side end face to the second side end face of the lens barrel, the center thickness CTR of the reflective polarizing element on the optical axis, the center thickness CTQ of the quarter-wave plate on the optical axis, and the center thickness CT2 of the second lens on the optical axis can satisfy: 2.50≤L / (CTR+CTQ+CT2)≤3.67.

[0016] In one embodiment, the effective focal length f of the visual system and the distance EP01 on the optical axis from the first side end face of the lens barrel to the first side face of the first spacer element can satisfy: 4.35 <f / EP01<11.05。

[0017] In one embodiment, the distance L along the optical axis from the first end face to the second end face of the lens barrel can satisfy the following condition: 1.4 <L / (D0m-d0s)<1.7。

[0018] The visual system disclosed in this application includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens, and a partially reflective element arranged sequentially along the optical axis from a first side to a second side, all mounted in a lens barrel. The first lens has positive optical power, and its first side surface is convex, and its second side surface is convex. The second lens has positive optical power, and its first side surface is planar, and its second side surface is convex. The third lens has positive or negative optical power, and its second side surface is convex. A first spacer element abutting against the second side surface of the first lens is provided between the first lens and the second lens, and a second spacer element abutting against the second side surface of the second lens is provided between the second lens and the third lens. By rationally configuring the visual system and controlling the curvature radius R1 of the first side of the first lens and the outer diameter D0s of the first side end face of the lens barrel to satisfy the condition 1.37≤R1 / D0s≤1.80; the outer diameter D1s of the first side of the first spacer element, the inner diameter d1s of the first side of the first spacer element and the center thickness CT1 of the first lens on the optical axis to satisfy the condition 0.14≤(D1s-d1s) / CT1≤2.04; the distance EP01 from the first side end face of the lens barrel to the first side of the first spacer element on the optical axis, the maximum thickness CP1 of the first spacer element and the distance EP12 from the second side of the first spacer element to the first side of the second spacer element on the optical axis to satisfy the condition 0.99≤(EP01+CP1) / EP12≤2.47; the shape of the first lens can be rationally constrained, the problem of assembling the first lens and the lens can be well solved, and the assembly yield and stability can be improved. Attached Figure Description

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

[0020] Figure 1 A schematic diagram showing the structure and some parameters of a visual system according to an exemplary embodiment of this application is provided;

[0021] Figure 2 A schematic diagram of the visual system according to Embodiment 1 of this application is shown;

[0022] Figure 3 A schematic diagram of the visual system according to Embodiment 2 of this application is shown;

[0023] Figure 4 A schematic diagram of the visual system according to Embodiment 3 of this application is shown;

[0024] Figure 5 The MTF (Modulation Transfer Function) curves of the visual systems according to Embodiments 1, 2 and 3 of this application are shown;

[0025] Figure 6 A schematic diagram of the visual system according to Embodiment 4 of this application is shown;

[0026] Figure 7 A schematic diagram of the visual system according to Embodiment 5 of this application is shown;

[0027] Figure 8 A schematic diagram of the visual system according to Embodiment 6 of this application is shown;

[0028] Figure 9 The MTF curves of the visual systems according to Embodiments 4, 5 and 6 of this application are shown;

[0029] Figure 10 A schematic diagram of the visual system according to Embodiment 7 of this application is shown;

[0030] Figure 11 A schematic diagram of the visual system according to Embodiment 8 of this application is shown;

[0031] Figure 12 A schematic diagram of the visual system according to Embodiment 9 of this application is shown;

[0032] Figure 13 MTF curves of the visual systems according to Embodiments 7, 8 and 9 of this application are shown. 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.

[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 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.

[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 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.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This 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 system according to an exemplary embodiment of this application may include a lens barrel and a lens assembly and a spacer assembly mounted within the lens barrel.

[0042] In an exemplary embodiment, the lens group may include a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens, and a partially reflective element arranged sequentially along the optical axis from the first side to the second side.

[0043] In an exemplary embodiment, the first lens may have positive optical power, and its first side surface may be convex, and its second side surface may be convex.

[0044] In an exemplary embodiment, the second lens may have positive optical power, and its first side surface may be a plane and its second side surface may be a convex surface.

[0045] In an exemplary embodiment, the third lens may have positive or negative optical power, and its second side surface may be convex.

[0046] In an exemplary embodiment, the spacer group may include a first spacer element located between the first lens and the second lens, and the first spacer element may abut against a second side of the first lens.

[0047] In an exemplary embodiment, the spacer group may include a second spacer located between the second lens and the third lens, and the second spacer may abut against a second side of the second lens.

[0048] Understandably, along the optical axis, the surface of each element or structure in the visual system that is closer to the first side and farther from the second side can be the first side surface of the element or structure, and the surface of each element that is closer to the second side and farther from the first side can be the second side surface of the element or structure.

[0049] In an exemplary embodiment, the first side may be, for example, the human eye side, and the second side may be, for example, the display side. The visual system may be used in various VR devices or apparatuses.

[0050] In an exemplary embodiment, the visual system of this application can satisfy the condition 1.37≤R1 / D0s≤1.80, where R1 is the radius of curvature of the first side surface of the first lens, and D0s is the outer diameter of the first side end face of the lens barrel. It can be understood that the first side end face of the lens barrel can be the end face or surface of the lens barrel closest to the first side and perpendicular or approximately perpendicular to the optical axis; the second side end face of the lens barrel can be the end face or surface of the lens barrel closest to the second side and perpendicular or approximately perpendicular to the optical axis.

[0051] In an exemplary embodiment, the visual system of this application can satisfy the condition 0.14≤(D1s-d1s) / CT1≤2.04, where D1s is the outer diameter of the first side of the first spacer element, d1s is the inner diameter of the first side of the first spacer element, and CT1 is the center thickness of the first lens on the optical axis.

[0052] In an exemplary embodiment, the visual system of this application can satisfy the condition 0.99≤(EP01+CP1) / EP12≤2.47, where EP01 is the distance on the optical axis from the first side end face of the lens barrel to the first side face of the first spacer element, CP1 is the maximum thickness of the first spacer element, and EP12 is the distance on the optical axis from the second side face of the first spacer element to the first side face of the second spacer element. It can be understood that the thickness of the spacer element can refer to the thickness of the spacer element along the optical axis or parallel to the optical axis.

[0053] The visual system provided according to an exemplary embodiment of this application includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens, and a partially reflective element arranged sequentially along the optical axis from a first side to a second side, all mounted in a lens barrel. The first lens has positive optical power, with a first convex side and a second convex side; the second lens has positive optical power, with a first planar side and a second convex side; the third lens has either positive or negative optical power, with a second convex side; a first spacer element abutting against the second side of the first lens is provided between the first lens and the second lens; and a second spacer element abutting against the second side of the second lens is provided between the second lens and the third lens. By rationally configuring the visual system and controlling the curvature radius R1 of the first side of the first lens and the outer diameter D0s of the first side end face of the lens barrel to satisfy the condition 1.37≤R1 / D0s≤1.80; the outer diameter D1s of the first side of the first spacer element, the inner diameter d1s of the first side of the first spacer element and the center thickness CT1 of the first lens on the optical axis to satisfy the condition 0.14≤(D1s-d1s) / CT1≤2.04; the distance EP01 from the first side end face of the lens barrel to the first side of the first spacer element on the optical axis, the maximum thickness CP1 of the first spacer element and the distance EP12 from the second side of the first spacer element to the first side of the second spacer element on the optical axis to satisfy the condition 0.99≤(EP01+CP1) / EP12≤2.47; the shape of the first lens can be rationally constrained, the problem of assembling the first lens and the lens can be well solved, and the assembly yield and stability can be improved.

[0054] In an exemplary embodiment, under stress, the structure of the non-effective diameter region of the first side surface of the first lens will deform, and the center point and edge point of the first side surface of the first lens will be displaced, resulting in a change in surface shape accuracy. The amount of surface shape change of the first side surface of the first lens (i.e., structural sensitivity) can be represented by ΔS1PV. Specifically, ΔS1PV can represent the difference between the displacement of the center point and the displacement of the edge point of the first side surface of the first lens. The smaller the value of ΔS1PV, the better the structural sensitivity.

[0055] The table below shows the analysis of structural sensitivity, optical sensitivity, and overall sensitivity for three different visual system schemes, specifically the change in the surface shape of the first side L1S1 of the first lens. (The table includes information on these parameters.)

[0056] The conditional expressions R1 / D0s, (D1s-d1s) / CT1, and (EP01+CP1) / EP12 of the visual system 1 in the first scheme satisfy the constraints 1.37≤R1 / D0s≤1.80, 0.14≤(D1s-d1s) / CT1≤2.04, and 0.99≤(EP01+CP1) / EP12≤2.47, respectively. R1 / D0s=1.55, (D1s-d1s) / CT1=1.1, and (EP01+CP1) / EP12=1.57.

[0057] The values ​​of the conditional expressions R1 / D0s, (D1s-d1s) / CT1, and (EP01+CP1) / EP12 of the second scheme's visual system 2 are all less than the lower limits defined by 1.37≤R1 / D0s≤1.80, 0.14≤(D1s-d1s) / CT1≤2.04, and 0.99≤(EP01+CP1) / EP12≤2.47, respectively. R1 / D0s=1.1, (D1s-d1s) / CT1=0.05, and (EP01+CP1) / EP12=0.64;

[0058] The values ​​of the conditional expressions R1 / D0s, (D1s-d1s) / CT1, and (EP01+CP1) / EP12 of the third scheme's visual system 3 are all greater than the upper limits defined by 1.37≤R1 / D0s≤1.80, 0.14≤(D1s-d1s) / CT1≤2.04, and 0.99≤(EP01+CP1) / EP12≤2.47, respectively. R1 / D0s=2.0, (D1s-d1s) / CT1=2.2, and (EP01+CP1) / EP12=3.41.

[0059]

[0060] In this table, 0.8S.Peak can be the peak value of the S-curve of the MTF curve at a field of view of 0.8, and 0.8M.Peak can be the peak value of the M-curve of the MTF curve at a field of view of 0.8, where "S" represents the sagittal curve and "M" represents the meridional curve. When ΔS1PV changes, 0.8S.Peak and / or 0.8M.Peak will change accordingly, and the amount of change in 0.8S.Peak and / or 0.8M.Peak can be considered as optical sensitivity. Specifically, the row containing S1+ shows the change in optical sensitivity when ΔS1PV increases by 1 μm, and the row containing S1- shows the change in optical sensitivity when ΔS1PV decreases by 1 μm. The overall sensitivity in the table can be the product of structural sensitivity and optical sensitivity. The smaller the absolute value of the overall sensitivity, the better the overall sensitivity of the L1S1 surface.

[0061] As can be seen from the table, the conditional expressions R1 / D0s, (D1s-d1s) / CT1, and (EP01+CP1) / EP12 of the visual system 1 in the first scheme all satisfy the constraints of 1.37≤R1 / D0s≤1.80, 0.14≤(D1s-d1s) / CT1≤2.04, and 0.99≤(EP01+CP1) / EP12≤2.47, respectively. The absolute value of the overall sensitivity of the visual system 1 is smaller than that of the other two cases, the overall sensitivity of the visual system 1 is better, and the system stability is superior. The visual systems of the second and third schemes, R1 / D0s, (D1s-d1s) / CT1, and (EP01+CP1) / EP12, respectively do not satisfy the constraints of 1.37≤R1 / D0s≤1.80, 0.14≤(D1s-d1s) / CT1≤2.04, and 0.99≤(EP01+CP1) / EP12≤2.47. Therefore, their overall sensitivity is relatively poor and their system stability is also relatively poor.

[0062] Therefore, the visual system according to this application, by controlling the conditions 1.37≤R1 / D0s≤1.80, 0.14≤(D1s-d1s) / CT1≤2.04 and 0.99≤(EP01+CP1) / EP12≤2.47, can reasonably constrain the shape of the first lens, effectively solve the problem of assembling the first lens and the lens assembly, and improve the assembly yield and stability.

[0063] In an exemplary embodiment, the visual system of this application can satisfy the condition 2.75≤f / (d0m-d0s)≤4.43, where f is the effective focal length of the visual system, d0m is the inner diameter of the second side end face of the lens barrel, and d0s is the inner diameter of the first side end face of the lens barrel. By reasonably controlling the range of this condition, the shape of the first lens is constrained, the wall thickness of the lens barrel is controlled, which is beneficial to the miniaturization of the lens; at the same time, it is beneficial to the assembly of the lens elements and can reduce the deformation after the lens and spacer elements are assembled.

[0064] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.05 < L / EPD < 3.0, where L is the distance on the optical axis from the first side end face of the lens barrel to the second side end face of the lens barrel, and EPD is the entrance pupil diameter of the visual system. By reasonably controlling the range of this conditional formula, on the one hand, it can help enhance the immersive experience of the VR lens, and on the other hand, it can make the height dimension of the lens barrel as small as possible, thereby reducing the overall size of the machine.

[0065] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 6.15 < TD / CP2 < 9.65, where TD is the distance on the optical axis from the first side face of the first lens to the second side face of the third lens, and CP2 is the maximum thickness of the second spacer element. By reasonably controlling the range of this conditional formula, the length of the lens barrel can be further controlled, and the overall focal length of the optical system can be made small, making the on-axis distance from the first side face of the first lens to the second side face of the third lens as close as possible, meeting the requirements of the miniaturized design of the visual system.

[0066] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 2.38 ≤ |f3| / d2m ≤ 4.45, where f3 is the effective focal length of the third lens, and d2m is the inner diameter of the second side face of the second spacer element. By reasonably controlling the range of this conditional formula, the field angle of the system is indirectly restricted, so that the system meets the characteristics of a large field angle of the VR lens, and it is beneficial to improve the stability of lens support.

[0067] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.2 < CT2 / EP12 < 3.1, where CT2 is the central thickness of the second lens on the optical axis, and EP12 is the distance on the optical axis from the second side face of the first spacer element to the first side face of the second spacer element. By reasonably controlling the range of this conditional formula, the thickness ratio of the second lens can be guaranteed, which is beneficial to the molding of the second lens.

[0068] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.9 < CT3 / (D2m - d2m) < 4.8, where CT3 is the central thickness of the third lens on the optical axis, D2m is the outer diameter of the second side face of the second spacer element, and d2m is the inner diameter of the second side face of the second spacer element. By reasonably controlling the range of this conditional formula, it is beneficial to restrict the total length of the optical system, ensure the thickness ratio of the third lens, is beneficial to the molding of the lens, and at the same time improves the stability of lens assembly.

[0069] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.4 ≤ T23 / (D2s - d2s) ≤ 2.65, where T23 is the distance on the optical axis from the second side surface of the second lens to the first side surface of the third lens, D2s is the outer diameter of the first side surface of the second spacer element, and d2s is the inner diameter of the first side surface of the second spacer element. By reasonably controlling the range of this conditional formula, the center thickness and edge thickness of the second and third lenses can be restricted within a certain range, which is beneficial to the molding of the second and third lenses and the assembly stability of the glued components; at the same time, the molding feasibility of the second spacer element can be ensured, and the stray light risk can be reduced.

[0070] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 0.9 < d1m / (V2 / N2) < 1.1, where d1m is the inner diameter of the second side surface of the first spacer element, V2 is the dispersion coefficient of the second lens, and N2 is the refractive index of the second lens. By reasonably controlling the range of this conditional formula, it is beneficial to correct the chromatic aberration of the optical system and more reasonably select optical materials with conventional properties, thereby improving the user experience of consumers.

[0071] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.05 < D0m / D1m < 1.2, where D0m is the outer diameter of the second side end face of the lens barrel, and D1m is the outer diameter of the second side surface of the first spacer element. By reasonably controlling the range of this conditional formula, on the one hand, the size of the lens barrel can be controlled to achieve a miniaturized design of the lens barrel; on the other hand, the wall thickness of the lens barrel can be indirectly controlled, and the molding feasibility of the lens barrel can be ensured.

[0072] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.0 < f1 / (d0s + d1s) < 1.65, where f1 is the effective focal length of the first lens, d0s is the inner diameter of the first side end face of the lens barrel, and d1s is the inner diameter of the first side surface of the first spacer element. By reasonably controlling the range of this conditional formula, it is beneficial to restrict the volume of the lens barrel and make the system meet the requirements of miniaturized design.

[0073] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 0.20 mm ≤ |R6 / R5| × CP2 ≤ 3.91 mm, where R6 is the curvature radius of the second side surface of the third lens, R5 is the curvature radius of the first side surface of the third lens, and CP2 is the maximum thickness of the second spacer element. By reasonably controlling the range of this conditional formula, the curvatures of the first and second side surfaces of the third lens can be controlled, the surface shape of the third lens can be restricted, which is beneficial to reducing the lens sensitivity; at the same time, the thin-to-thick ratio of the third lens can be controlled, which is beneficial to the molding of the third lens.

[0074] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 2.50 ≤ L / (CTR + CTQ + CT2) ≤ 3.67, where L is the distance on the optical axis from the first side end face of the lens barrel to the second side end face of the lens barrel, CTR is the central thickness on the optical axis of the reflective polarizing element, CTQ is the central thickness on the optical axis of the quarter-wave plate, and CT2 is the central thickness on the optical axis of the second lens. By reasonably controlling the range of this conditional formula, it is beneficial to restrict the field angle of the system, meet the wide-angle requirements of the device, and can restrict the thickness of the reflective polarizing element, which is beneficial to film adhesion.

[0075] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 4.35 < f / EP01 < 11.05, where f is the effective focal length of the visual system, and EP01 is the distance on the optical axis from the first side end face of the lens barrel to the first side face of the first spacer element. By reasonably controlling the range of this conditional formula, on the one hand, it is beneficial to the shaping of the lens barrel and the lens; on the other hand, it can make the lens have the characteristic of a large field angle.

[0076] In an exemplary embodiment, the visual system of the present application can satisfy the conditional formula 1.4 < L / (D0m - d0s) < 1.7, where L is the distance on the optical axis from the first side end face of the lens barrel to the second side end face of the lens barrel, D0m is the outer diameter of the second side end face of the lens barrel, and d0s is the inner diameter of the first side end face of the lens barrel. By reasonably controlling the range of this conditional formula, the volume size of the lens barrel is directly restricted, meeting the requirements of the system miniaturization design.

[0077] In an exemplary embodiment, the visual system of the present application may include at least one aperture stop. The aperture stop can restrict the light path and control the light intensity. The aperture stop can be set at an appropriate position in the visual system as needed. For example, the aperture stop can be set between the first side (the human eye side) and the first lens.

[0078] In an exemplary embodiment, optionally, the above visual system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0079] On one hand, according to the above-described embodiment of the present application, the visual system comprises a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens, and a partially reflective element arranged sequentially along the optical axis from the first side to the second side in a lens barrel. The first lens has positive optical power, with a first convex side and a second convex side; the second lens has positive optical power, with a first planar side and a second convex side; the third lens has either positive or negative optical power, with a second convex side. A first spacer element is provided between the first and second lenses and abuts against the second side of the first lens, and a second spacer element is provided between the second and third lenses and abuts against the second side of the second lens. Simultaneously, the radius of curvature R1 of the first side of the first lens and the first side of the lens barrel are controlled. The outer diameter D0s of the end face satisfies the condition 1.37≤R1 / D0s≤1.80; the outer diameter D1s of the first side of the first spacer element, the inner diameter d1s of the first side of the first spacer element, and the center thickness CT1 of the first lens on the optical axis satisfy the condition 0.14≤(D1s-d1s) / CT1≤2.04; and the distance EP01 from the first end face of the lens barrel to the first side of the first spacer element on the optical axis, the maximum thickness CP1 of the first spacer element, and the distance EP12 from the second side of the first spacer element to the first side of the second spacer element on the optical axis satisfy the condition 0.99≤(EP01+CP1) / EP12≤2.47; this can reasonably constrain the shape of the first lens, effectively solve the problem of assembling the first lens and the lens, and improve the assembly yield and stability.

[0080] On the other hand, the visual system according to the above-described embodiments of this application comprises a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens, and a partially reflective element arranged sequentially along the optical axis from the first side to the second side in a lens barrel. The first lens has positive optical power, with a first convex side and a second convex side; the second lens has positive optical power, with a first planar side and a second convex side; the third lens has either positive or negative optical power, with a second convex side. A first spacer element is provided between the first and second lenses and abuts against the second side of the first lens, and a second spacer element is provided between the second and third lenses and abuts against the second side of the second lens. Simultaneously, the first side of the first lens is controlled. The radius of curvature R1 and the outer diameter D0s of the first side end face of the lens barrel satisfy the condition 1.37≤R1 / D0s≤1.80; the outer diameter D1s of the first side face of the first spacer element, the inner diameter d1s of the first side face of the first spacer element, and the center thickness CT1 of the first lens on the optical axis satisfy the condition 0.14≤(D1s-d1s) / CT1≤2.04; and the effective focal length f of the visual system and the inner diameter d0m of the second side end face of the lens barrel and the inner diameter d0s of the first side end face of the lens barrel satisfy the condition 2.75≤f / (d0m-d0s)≤4.43; can reasonably constrain the shape of the first lens, control the wall thickness of the lens barrel, which is conducive to the miniaturization of the lens; at the same time, it is conducive to the assembly of the lens and can reduce the deformation after the lens and spacer element are assembled.

[0081] Furthermore, this application also provides a VR device that may include the visual system provided in any of the above embodiments, wherein the first side is the human eye side and the second side is the display side. This VR device may have at least one of the following beneficial effects: miniaturization, lightweight design, and high image quality, enabling users to obtain a better application experience.

[0082] Specific embodiments of the visual system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0083] Example 1

[0084] The following is for reference Figure 2 A visual system according to Embodiment 1 of this application is described. Figure 2 A schematic diagram of the visual system according to Embodiment 1 of this application is shown.

[0085] like Figure 2As shown, the visual system includes a lens barrel P0 and, mounted within the lens barrel P0, the following components arranged sequentially along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS. The quarter-wave plate QWP is located on the first side of the second lens E2, the reflective polarizing element RP is located on the first side of the quarter-wave plate QWP, and the partial reflective element BS is located on the second side of the third lens E3. The first lens E1 has positive optical power, with its first side S2 being convex and its second side S3 being convex; the second lens E2 has positive optical power, with its first side S14 being flat and its second side S15 being convex; the third lens E3 has positive optical power, with its first side S16 being convex and its second side S17 being convex.

[0086] In this embodiment, the visual system further includes: a first spacer element P1 located between the first lens E1 and the second lens E2, and the first spacer element P1 abutting against the second side surface of the first lens E1; and a second spacer element P2 located between the second lens E2 and the third lens E3, and the second spacer element P2 abutting against the second side surface of the second lens E2.

[0087] In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane (IMG).

[0088] Table 1 shows the basic parameters of the visual system of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0089]

[0090]

[0091] Table 1

[0092] In Embodiment 1, the first side surface S2 and the second side surface S3 of the first lens E1, the second side surface S15 of the second lens E2, and the first side surface S16 and the second side surface S17 of the third lens E3 are all aspherical surfaces. The shape of each aspherical surface can be defined using, but is not limited to, the following aspherical formula:

[0093]

[0094] Where x 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 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17 that can be used for each aspherical surface S2-S3 and S15-S17 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0095] coefficient\surface S2 S3 S15 S16 S17 A4 1.3684E-05 2.0827E-05 -6.8853E-06 -1.5870E-05 -2.2182E-06 A6 -1.6485E-08 -5.2540E-09 -1.6186E-08 9.8354E-09 4.1994E-09 A8 -1.2739E-11 -6.4922E-11 8.4979E-11 -1.6458E-12 -3.6128E-12 A10 -1.2571E-14 -4.3976E-14 -7.2568E-14 6.6756E-15 1.0073E-14 A12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0096] Table 2

[0097] Referring to Table 7, the values ​​of the following structural parameters in this embodiment are shown in the 'Embodiment 1' column of Table 7: d1s is the inner diameter of the first side of the first spacer element P1; d1m is the inner diameter of the second side of the first spacer element P1; D1s is the outer diameter of the first side of the first spacer element P1; D1m is the outer diameter of the second side of the first spacer element P1; d2s is the inner diameter of the first side of the second spacer element P2; d2m is the inner diameter of the second side of the second spacer element P2; D2s is the outer diameter of the first side of the second spacer element P2; D2m is the outer diameter of the second side of the second spacer element P2; d0s is The inner diameter of the first side end face of the lens barrel P0; d0m is the inner diameter of the second side end face of the lens barrel P0; D0s is the outer diameter of the first side end face of the lens barrel P0; D0m is the outer diameter of the second side end face of the lens barrel P0; EP01 is the distance on the optical axis from the first side end face of the lens barrel P0 to the first side surface of the first spacer element P1; CP1 is the maximum thickness of the first spacer element P1; EP12 is the distance on the optical axis from the second side surface of the first spacer element P1 to the first side surface of the second spacer element P2; CP2 is the maximum thickness of the second spacer element P2; and L is the distance on the optical axis from the first side end face of the lens barrel P0 to its second side end face. The units of all the parameters shown in Table 7 are millimeters (mm), and a schematic diagram of the above parameters in the visual system structure diagram can be found by referring to... Figure 1 .

[0098] Example 2

[0099] The following is for reference Figure 3 A visual system according to Embodiment 2 of this application is described.

[0100] like Figure 3As shown, in this embodiment, the visual system also includes a lens barrel P0 and, mounted in the lens barrel P0, sequentially arranged along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS; wherein, the quarter-wave plate QWP is disposed on the first side of the second lens E2, the reflective polarizing element RP is disposed on the first side of the quarter-wave plate QWP, and the partial reflective element BS is disposed on the second side of the third lens E3. In this embodiment, the first lens E1 has positive optical power, its first side S2 is convex, and its second side S3 is convex; the second lens E2 has positive optical power, its first side S14 is flat, and its second side S15 is convex; the third lens E3 has positive optical power, its first side S16 is convex, and its second side S17 is convex.

[0101] The visual system of this embodiment also includes a first spacer element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens E1, and a second spacer element P2 located between the second lens E2 and the third lens E3 and abutting against the second side of the second lens E2. In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane IMG.

[0102] The basic parameter table of the visual system in this embodiment is the same as Table 1 in Embodiment 1, and the table of higher-order coefficients of the aspherical mirror is the same as Table 2 in Embodiment 1.

[0103] The numerical values ​​of the structural parameters of the visual system in this embodiment are shown in the 'Embodiment 2' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0104] Example 3

[0105] The following is for reference Figure 4 A visual system according to Embodiment 3 of this application is described.

[0106] like Figure 4As shown, in this embodiment, the visual system also includes a lens barrel P0 and, mounted in the lens barrel P0, sequentially arranged along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS; wherein, the quarter-wave plate QWP is disposed on the first side of the second lens E2, the reflective polarizing element RP is disposed on the first side of the quarter-wave plate QWP, and the partial reflective element BS is disposed on the second side of the third lens E3. In this embodiment, the first lens E1 has positive optical power, its first side S2 is convex, and its second side S3 is convex; the second lens E2 has positive optical power, its first side S14 is flat, and its second side S15 is convex; the third lens E3 has positive optical power, its first side S16 is convex, and its second side S17 is convex.

[0107] The visual system of this embodiment also includes a first spacer element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens E1, and a second spacer element P2 located between the second lens E2 and the third lens E3 and abutting against the second side of the second lens E2. In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane IMG.

[0108] The basic parameter table of the visual system in this embodiment is the same as Table 1 in Embodiment 1, and the table of higher-order coefficients of the aspherical mirror is the same as Table 2 in Embodiment 1.

[0109] The numerical values ​​of the structural parameters of the visual system in this embodiment are shown in the 'Embodiment 3' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0110] Figure 5 The MTF curves of the visual systems in Embodiments 1, 2, and 3 are shown. The MTF curves can represent the optical modulation function values ​​corresponding to different spatial frequencies. Figure 5 It is evident that the visual systems provided in Examples 1, 2, and 3 can achieve good imaging quality.

[0111] Example 4

[0112] The following is for reference Figure 6 A visual system according to Embodiment 4 of this application is described.

[0113] like Figure 6As shown, in this embodiment, the visual system includes a lens barrel P0 and, mounted in the lens barrel P0, the following components arranged sequentially along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS. The quarter-wave plate QWP is disposed on the first side of the second lens E2, the reflective polarizing element RP is disposed on the first side of the quarter-wave plate QWP, and the partial reflective element BS is disposed on the second side of the third lens E3. In this embodiment, the first lens E1 has positive optical power, with its first side S2 being convex and its second side S3 being convex; the second lens E2 has positive optical power, with its first side S14 being planar and its second side S15 being convex; and the third lens E3 has positive optical power, with its first side S16 being convex and its second side S17 being convex.

[0114] In this embodiment, the visual system further includes: a first spacer element P1 located between the first lens E1 and the second lens E2, and the first spacer element P1 abutting against the second side surface of the first lens E1; and a second spacer element P2 located between the second lens E2 and the third lens E3, and the second spacer element P2 abutting against the second side surface of the second lens E2.

[0115] In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane (IMG).

[0116] Table 3 shows the basic parameters of the visual system in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm). In this embodiment, the first side surface S2 and the second side surface S3 of the first lens E1, the second side surface S15 of the second lens E2, and the first side surface S16 and the second side surface S17 of the third lens E3 are all aspherical surfaces. Table 4 shows the higher-order coefficients A4, A6, A8, and A17 that can be used for each aspherical surface S2-S3, S15-S17 in Embodiment 4. 10 A 12 A 14 A 16 A 18 and A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0117]

[0118] Table 3

[0119] coefficient\surface S2 S3 S15 S16 S17 A4 -5.6489E-06 -6.7623E-06 -6.1341E-07 -8.5880E-06 -3.4515E-07 A6 -1.3799E-09 2.2317E-08 -2.8462E-09 1.4528E-09 -3.2155E-10 A8 0.0000E+00 0.0000E+00 -1.8260E-12 -1.3237E-12 -1.5081E-12 A10 0.0000E+00 0.0000E+00 1.7415E-14 0.0000E+00 0.0000E+00 A12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0120] Table 4

[0121] Referring to Table 7, the values ​​of each structural parameter of the visual system in this embodiment are shown in the 'Embodiment 4' column of Table 7. The specific description of the meaning of each parameter is the same as that in Embodiment 1 above, and will not be repeated here.

[0122] Example 5

[0123] The following is for reference Figure 7 A visual system according to Embodiment 5 of this application is described.

[0124] like Figure 7 As shown, in this embodiment, the visual system also includes a lens barrel P0 and, mounted in the lens barrel P0, sequentially arranged along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS; wherein, the quarter-wave plate QWP is disposed on the first side of the second lens E2, the reflective polarizing element RP is disposed on the first side of the quarter-wave plate QWP, and the partial reflective element BS is disposed on the second side of the third lens E3. In this embodiment, the first lens E1 has positive optical power, its first side S2 is convex, and its second side S3 is convex; the second lens E2 has positive optical power, its first side S14 is flat, and its second side S15 is convex; the third lens E3 has positive optical power, its first side S16 is convex, and its second side S17 is convex.

[0125] The visual system of this embodiment also includes a first spacer element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens E1, and a second spacer element P2 located between the second lens E2 and the third lens E3 and abutting against the second side of the second lens E2. In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane IMG.

[0126] The basic parameter table of the visual system in this embodiment is the same as Table 3 in Embodiment 4, and the table of higher-order coefficients of the aspherical mirror is the same as Table 4 in Embodiment 4.

[0127] The numerical values ​​of the structural parameters of the visual system in this embodiment are shown in the 'Embodiment 5' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0128] Example 6

[0129] The following is for reference Figure 8 A visual system according to Embodiment 6 of this application is described.

[0130] like Figure 8As shown, in this embodiment, the visual system also includes a lens barrel P0 and, mounted in the lens barrel P0, sequentially arranged along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS; wherein, the quarter-wave plate QWP is disposed on the first side of the second lens E2, the reflective polarizing element RP is disposed on the first side of the quarter-wave plate QWP, and the partial reflective element BS is disposed on the second side of the third lens E3. In this embodiment, the first lens E1 has positive optical power, its first side S2 is convex, and its second side S3 is convex; the second lens E2 has positive optical power, its first side S14 is flat, and its second side S15 is convex; the third lens E3 has positive optical power, its first side S16 is convex, and its second side S17 is convex.

[0131] The visual system of this embodiment also includes a first spacer element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens E1, and a second spacer element P2 located between the second lens E2 and the third lens E3 and abutting against the second side of the second lens E2. In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane IMG.

[0132] The basic parameter table of the visual system in this embodiment is the same as Table 3 in Embodiment 4, and the table of higher-order coefficients of the aspherical mirror is the same as Table 4 in Embodiment 4.

[0133] The numerical values ​​of the structural parameters of the visual system in this embodiment are shown in the 'Embodiment 6' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0134] Figure 9 The MTF curves of the visual systems in Examples 4, 5, and 6 are shown. Figure 9 As can be seen, the visual systems given in Examples 4, 5 and 6 can achieve good imaging quality.

[0135] Example 7

[0136] The following is for reference Figure 10 A visual system according to Embodiment 7 of this application is described. Figure 10 A schematic diagram of the visual system according to Embodiment 7 of this application is shown.

[0137] like Figure 10As shown, in this embodiment, the visual system includes a lens barrel P0 and, mounted in the lens barrel P0, the following components arranged sequentially along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS. The quarter-wave plate QWP is disposed on the first side of the second lens E2, the reflective polarizing element RP is disposed on the first side of the quarter-wave plate QWP, and the partial reflective element BS is disposed on the second side of the third lens E3. In this embodiment, the first lens E1 has positive optical power, with its first side S2 being convex and its second side S3 being convex; the second lens E2 has positive optical power, with its first side S14 being planar and its second side S15 being convex; and the third lens E3 has negative optical power, with its first side S16 being concave and its second side S17 being convex.

[0138] In this embodiment, the visual system further includes: a first spacer element P1 located between the first lens E1 and the second lens E2, and the first spacer element P1 abutting against the second side surface of the first lens E1; and a second spacer element P2 located between the second lens E2 and the third lens E3, and the second spacer element P2 abutting against the second side surface of the second lens E2.

[0139] In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane (IMG).

[0140] Table 5 shows the basic parameters of the visual system of Embodiment 7, where the units for radius of curvature and thickness / distance are millimeters (mm). In this embodiment, the first side surface S2 and the second side surface S3 of the first lens E1, the second side surface S15 of the second lens E2, and the first side surface S16 and the second side surface S17 of the third lens E3 are all aspherical surfaces. Table 6 shows the higher-order coefficients A4, A6, A8, and A17 of each aspherical surface S2-S3, S15-S17 that can be used in Embodiment 7. 10 A 12 A 14 A 16 A 18 and A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0141]

[0142] Table 5

[0143]

[0144]

[0145] Table 6

[0146] Referring to Table 7, the values ​​of each structural parameter of the visual system in this embodiment are shown in the 'Embodiment 7' column of Table 7. The specific description of the meaning of each parameter is the same as that in Embodiment 1 above, and will not be repeated here.

[0147] Example 8

[0148] The following is for reference Figure 11 A visual system according to Embodiment 8 of this application is described.

[0149] like Figure 11 As shown, in this embodiment, the visual system also includes a lens barrel P0 and, mounted in the lens barrel P0, the following elements arranged sequentially along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS; wherein, the quarter-wave plate QWP is disposed on the first side of the second lens E2, the reflective polarizing element RP is disposed on the first side of the quarter-wave plate QWP, and the partial reflective element BS is disposed on the second side of the third lens E3. In this embodiment, the first lens E1 has positive optical power, its first side S2 is convex, and its second side S3 is convex; the second lens E2 has positive optical power, its first side S14 is flat, and its second side S15 is convex; the third lens E3 has negative optical power, its first side S16 is concave, and its second side S17 is convex.

[0150] The visual system of this embodiment also includes a first spacer element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens E1, and a second spacer element P2 located between the second lens E2 and the third lens E3 and abutting against the second side of the second lens E2. In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane IMG.

[0151] The basic parameter table of the visual system in this embodiment is the same as Table 5 in Embodiment 7, and the table of higher-order coefficients of the aspherical mirror is the same as Table 6 in Embodiment 7.

[0152] The numerical values ​​of the structural parameters of the visual system in this embodiment are shown in the 'Embodiment 8' column of Table 7. The specific descriptions of the meanings represented by each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0153] Example 9

[0154] The following is for reference Figure 12 A visual system according to Embodiment 9 of this application is described.

[0155] like Figure 12 As shown, in this embodiment, the visual system also includes a lens barrel P0 and, mounted in the lens barrel P0, the following elements arranged sequentially along the optical axis from the first side to the second side: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, a third lens E3, and a partial reflective element BS; wherein, the quarter-wave plate QWP is disposed on the first side of the second lens E2, the reflective polarizing element RP is disposed on the first side of the quarter-wave plate QWP, and the partial reflective element BS is disposed on the second side of the third lens E3. In this embodiment, the first lens E1 has positive optical power, its first side S2 is convex, and its second side S3 is convex; the second lens E2 has positive optical power, its first side S14 is flat, and its second side S15 is convex; the third lens E3 has negative optical power, its first side S16 is concave, and its second side S17 is convex.

[0156] The visual system of this embodiment also includes a first spacer element P1 located between the first lens E1 and the second lens E2 and abutting against the second side of the first lens E1, and a second spacer element P2 located between the second lens E2 and the third lens E3 and abutting against the second side of the second lens E2. In this embodiment, the first side can be, for example, the human eye side, and the second side can be, for example, the display side. The second side of the visual system has an image plane IMG.

[0157] The basic parameter table of the visual system in this embodiment is the same as Table 5 in Embodiment 7, and the table of higher-order coefficients of the aspherical mirror is the same as Table 6 in Embodiment 7.

[0158] The numerical values ​​of the structural parameters of the visual system in this embodiment are shown in column 'Embodiment 9' of Table 7. The specific descriptions of the meanings of each parameter are the same as those in Embodiment 1 above, and will not be repeated here.

[0159] Figure 13 The MTF curves of the visual systems in Examples 7, 8, and 9 are shown. Figure 13 As can be seen, the visual systems given in Examples 7, 8 and 9 can achieve good imaging quality.

[0160] Parameters / Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 d1s 33.871 33.745 34.105 39.029 38.928 39.083 34.796 35.140 34.530 d1m 34.311 34.466 34.243 39.029 38.928 39.083 35.474 35.304 35.512 D1s 35.047 34.911 34.931 45.419 45.419 45.419 36.156 36.006 36.090 D1m 35.555 35.177 35.355 45.419 45.419 45.419 36.580 36.391 36.480 d2s 35.638 35.755 35.816 45.207 44.189 45.117 36.199 36.332 36.542 d2m 36.415 36.562 36.527 45.448 45.366 45.492 36.583 36.408 36.691 D2s 36.854 36.775 36.783 46.182 45.716 46.301 37.263 37.178 37.343 D2m 37.469 37.511 37.374 46.502 46.382 46.574 38.152 37.952 37.970 d0s 33.968 33.818 33.968 44.308 44.072 44.039 35.384 35.278 35.441 d0m 40.087 39.919 40.129 48.115 48.177 48.059 41.420 41.285 41.452 D0s 36.456 36.683 36.456 45.987 46.230 45.947 37.435 37.316 37.619 D0m 41.807 41.703 41.852 49.479 49.416 49.381 42.795 42.738 42.859 EP01 3.647 3.753 3.894 2.377 2.526 2.340 1.653 2.108 1.653 CP1 1.060 1.060 0.813 0.100 0.100 0.100 1.427 1.043 1.427 EP12 2.423 2.448 2.423 1.789 1.753 2.457 1.275 1.275 1.861 CP2 1.844 1.819 1.844 2.138 2.174 1.470 2.103 2.103 1.517 L 11.843 11.949 11.897 8.697 8.847 8.695 10.470 10.540 10.470

[0161] Table 7

[0162] Furthermore, in Examples 1 to 9, the effective focal length f of the visual system, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the entrance pupil diameter EPD of the visual system, and the distance TD on the optical axis from the first side surface of the first lens to the second side surface of the third lens are shown in Table 8 below.

[0163] Parameters / Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 f(mm) 16.96 16.96 16.96 16.86 16.86 16.86 18.21 18.21 18.21 f1(mm) 70.64 70.64 70.64 115.75 115.75 115.75 114.49 114.49 114.49 f2 (mm) 890596.73 890596.73 890596.73 330.04 330.04 330.04 58.14 58.14 58.14 f3 (mm) 90.15 90.15 90.15 108.26 108.26 108.26 -162.09 -162.09 -162.09 EPD (mm) 4.00 4.00 4.00 8.00 8.00 8.00 4.00 4.00 4.00 TD(mm) 15.80 15.80 15.80 13.47 13.47 13.47 14.59 14.59 14.59

[0164] Table 8 and Examples 1 to 9 respectively satisfy the conditions shown in Table 9 below.

[0165]

[0166]

[0167] Table 9

[0168] This application also provides an imaging device equipped with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. This imaging device is equipped with the visual system described above.

[0169] 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, characterized in that, It includes a lens barrel and a lens assembly and a spacer element assembly assembled within the lens barrel, wherein, The lens group includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens, and a partially reflective element arranged sequentially along the optical axis from the first side to the second side. The first lens has positive optical power, with a convex first side and a convex second side. The second lens has positive optical power, with a flat first side and a convex second side. The third lens has either positive or negative optical power, with a convex second side. The spacer element group includes: a first spacer element located between the first lens and the second lens, and abutting against a second side surface of the first lens; and a second spacer element located between the second lens and the third lens, and abutting against a second side surface of the second lens. The visual system satisfies: 1.37≤R1 / D0s≤1.80; 0.14≤(D1s-d1s) / CT1≤2.04; 0.99≤(EP01+CP1) / EP12≤2.47; Wherein, R1 is the radius of curvature of the first side surface of the first lens, D0s is the outer diameter of the first side end face of the lens barrel, D1s is the outer diameter of the first side surface of the first spacer element, d1s is the inner diameter of the first side surface of the first spacer element, CT1 is the center thickness of the first lens on the optical axis, EP01 is the distance from the first side end face of the lens barrel to the first side surface of the first spacer element on the optical axis, CP1 is the maximum thickness of the first spacer element, and EP12 is the distance from the second side surface of the first spacer element to the first side surface of the second spacer element on the optical axis.

2. The visual system according to claim 1, characterized in that, The effective focal length f of the visual system satisfies the following conditions: the inner diameter d0m of the second side end face of the lens barrel and the inner diameter d0s of the first side end face of the lens barrel. 2.75≤f / (d0m-d0s)≤4.

43.

3. The visual system according to claim 1, characterized in that, The distance L from the first end face of the lens barrel to the second end face of the lens barrel on the optical axis satisfies the following condition with respect to the entrance pupil diameter EPD of the visual system: 1.05 <L / EPD<3.0。 4. The visual system according to claim 1, characterized in that, The distance TD between the first side surface of the first lens and the second side surface of the third lens on the optical axis satisfies the following condition: 6.15 <TD / CP2<9.65。 5. The visual system according to claim 1, characterized in that, The effective focal length f3 of the third lens and the inner diameter d2m of the second side surface of the second spacer element satisfy the following: 2.38≤|f3| / d2m≤4.

45.

6. The visual system according to claim 1, characterized in that, The center thickness CT2 of the second lens on the optical axis and the distance EP12 from the second side of the first spacer element to the first side of the second spacer element on the optical axis satisfy the following: 1.2 <CT2 / EP12<3.1。 7. The visual system according to claim 1, characterized in that, The center thickness CT3 of the third lens on the optical axis satisfies the following conditions: the outer diameter D2m of the second side surface of the second spacer element and the inner diameter d2m of the second side surface of the second spacer element. 1.9 <CT3 / (D2m-d2m)<4.8。 8. The visual system according to claim 1, characterized in that, The distance T23 from the second side surface of the second lens to the first side surface of the third lens on the optical axis satisfies the following conditions: the outer diameter D2s of the first side surface of the second spacer element and the inner diameter d2s of the first side surface of the second spacer element. 1.4≤T23 / (D2s-d2s)≤2.

65.

9. The visual system according to claim 1, characterized in that, The inner diameter d1m of the second side of the first spacer element satisfies the following relationship with the dispersion coefficient V2 and refractive index N2 of the second lens: 0.9 <d1m / (V2 / N2)<1.1。 10. The visual system according to claim 1, characterized in that, The outer diameter D0m of the second side end face of the lens barrel and the outer diameter D1m of the second side face of the first spacer element satisfy the following: 1.05 <D0m / D1m<1.2。 11. The visual system according to claim 1, characterized in that, The effective focal length f1 of the first lens satisfies the following conditions: the inner diameter d0s of the first side end face of the lens barrel and the inner diameter d1s of the first side face of the first spacer element. 1.0 <f1 / (d0s+d1s)<1.65。 12. The visual system according to claim 1, characterized in that, The radius of curvature R6 of the second side surface of the third lens, the radius of curvature R5 of the first side surface of the third lens, and the maximum thickness CP2 of the second spacer element satisfy the following: 0.20mm≤|R6 / R5|×CP2≤3.91mm.

13. The visual system according to claim 1, characterized in that, The distance L from the first end face of the lens barrel to the second end face of the lens barrel on the optical axis satisfies the following conditions: the center thickness CTR of the reflective polarizing element on the optical axis, the center thickness CTQ of the quarter-wave plate on the optical axis, and the center thickness CT2 of the second lens on the optical axis. 2.50≤L / (CTR+CTQ+CT2)≤3.

67.

14. The visual system according to claim 1, characterized in that, The effective focal length f of the visual system and the distance EP01 from the first side end face of the lens barrel to the first side face of the first spacer element on the optical axis satisfy the following: 4.35 <f / EP01<11.05。 15. The visual system according to claim 1, characterized in that, The distance L from the first end face of the lens barrel to the second end face of the lens barrel on the optical axis satisfies the following conditions: the outer diameter D0m of the second end face of the lens barrel and the inner diameter d0s of the first end face of the lens barrel. 1.4 <L / (D0m-d0s)<1.7。

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