Optical imaging system and VR device including the optical imaging system

Abstract

The application discloses an optical imaging system, which comprises a first lens, a reflective polarizing element, a second lens, a quarter-wave plate and a third lens arranged in sequence from a first side to a second side along an optical axis, wherein the second side of the third lens is provided with a partial reflection layer; the refractive index N1 of the first lens, the refractive index N2 of the second lens and the refractive index N3 of the third lens satisfy N2>N1 or N2>N3; the effective focal length f1 of the first lens, the refractive index N1 of the first lens and the curvature radius R2 of the second side of the first lens satisfy -4.0< f1*N1 / R2< -2.0. The application further discloses a VR device comprising the optical imaging system.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical imaging system and a VR device including the optical imaging system. Background Technology

[0002] With the development of technology, virtual reality (VR) devices have generally gone through three optical scheme development stages: aspherical lenses, Fresnel lenses, and folding structures. Among them, the optical system of aspherical lenses and Fresnel lenses is too long, resulting in large size and heavy weight of the device. Folding structures can realize the folding of the light path, which greatly shortens the total length of the system and is the main direction of development of virtual reality devices.

[0003] However, current folding mirror structures generally suffer from problems such as a small field of view, heavy weight, and significant chromatic aberration, affecting the system's imaging quality and the user's immersive experience. Therefore, for the widely used three-element folding mirror structure, those skilled in the art hope to achieve this by more rationally designing the lenses included in the system. This can be achieved by, for example, rationally controlling the lens's radius of curvature, shape, and effective focal length, as well as by appropriately selecting lens materials and controlling parameters such as refractive index. This would allow for more effective correction of chromatic aberration, an increased system field of view, further reduction in size, and simultaneous improvement in system performance and imaging quality, ultimately enhancing the user's immersive experience. Summary of the Invention

[0004] This application provides an optical imaging system that, along the optical axis from a first side to a second side, may sequentially include a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, and a third lens, wherein the second side of the third lens has a partially reflective layer. The optical imaging system can satisfy N2>N1 or N2>N3, and can satisfy -4.0<f1×N1 / R2<-2.0, where N2 is the refractive index of the second lens, N1 is the refractive index of the first lens, N3 is the refractive index of the third lens, f1 is the effective focal length of the first lens, and R2 is the radius of curvature of the second side of the first lens.

[0005] In one embodiment, the optical imaging system further includes an emitting unit located on the second side, wherein half of the diagonal length of the effective pixel area on the emitting unit, ImgH, and half of the maximum field of view (Semi-FOV) of the optical imaging system can respectively satisfy: ImgH < 13.0 mm and Semi-FOV > 50°.

[0006] In one embodiment, the first side surface of the second lens is a plane, and the reflective polarizing element is attached to the first side surface of the second lens; and the refractive index NRP of the reflective polarizing element and the refractive index N2 of the second lens can satisfy: NRP <N2。

[0007] In one embodiment, the center thickness CT3 of the third lens on the optical axis, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis can satisfy: CT3>CT1>CT2.

[0008] In one embodiment, the refractive index NBS of the partial reflective layer and the refractive index N3 of the third lens can satisfy: NBS = N3.

[0009] In one embodiment, the second side surface of the second lens is concave, and the quarter-wave plate is attached to the second side surface of the second lens; and the refractive index Nqwp of the quarter-wave plate and the refractive index N2 of the second lens can satisfy: Nqwp <N2。

[0010] In one embodiment, the center thickness CT2 of the second lens on the optical axis and the air gap T12 between the first lens and the second lens on the optical axis can satisfy: 1.5 <CT2 / T12<7.6。

[0011] In one embodiment, the effective focal length f of the optical imaging system and the radius of curvature R1 of the first side surface of the first lens can satisfy: -0.2 <f / R1<0.2。

[0012] In one embodiment, the effective focal length f3 of the third lens, the radius of curvature R5 of the first side surface of the third lens, and the radius of curvature R6 of the second side surface of the third lens can satisfy: -5.0 <f3 / (R5+R6)<15.0。

[0013] In one embodiment, the effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the radius of curvature R4 of the second side surface of the second lens can satisfy: -3.0 <f2×N2 / R4<1.5。

[0014] In one embodiment, the air gap T23 between the second lens and the third lens on the optical axis and the sum of the air gaps ∑AT between any two adjacent lenses with optical power in the optical imaging system on the optical axis can satisfy: 0.5 < T23 / ∑AT < 1.0.

[0015] In one embodiment, the effective focal length f1 of the first lens, the refractive index N1 of the first lens, the radius of curvature R1 of the first side surface of the first lens, and the radius of curvature R2 of the second side surface of the first lens can satisfy: -1.5 < f1 × N1 / (R1 - R2) < 0.5.

[0016] In one embodiment, the maximum effective radius DT32 of the second side surface of the third lens and the maximum effective radius DT11 of the first side surface of the first lens can satisfy: 1.0 < DT32 / DT11 < 1.6.

[0017] On the other hand, this application also provides a VR device, which may include the optical imaging system provided in any of the above embodiments, wherein the first side is the receiving side and the second side is the transmitting side.

[0018] The optical imaging system disclosed in this application includes, sequentially from the first side to the second side along the optical axis, a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, and a third lens, wherein the second side of the third lens has a partially reflective layer. The refractive indices N1, N2, and N3 of the first, second, and third lenses satisfy the condition N2>N1 or N2>N3; the effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the radius of curvature R2 of the second side of the first lens satisfy the condition -4.0<f1×N1 / R2<-2.0. By setting a reflective polarizing element and a quarter-wave plate on the first and second sides of the second lens respectively, the reflective polarizing element can transmit light with a certain polarization direction and reflect polarized light orthogonal to that polarization direction; the quarter-wave plate can convert between linearly polarized light and circularly polarized light; combined with the partially reflective layer of the third lens, optical path refraction can be achieved, shortening the length of the optical system and facilitating the miniaturization of virtual reality devices. By controlling the refractive indices of the first, second, and third lenses—making the refractive index of the second lens greater than that of the first lens, or vice versa—the shape of the lenses can be controlled, which facilitates the convergence of edge light rays and corrects chromatic aberration in the system. Controlling the effective focal length, refractive index, and radius of curvature of the second side surface of the first lens increases the system's field of view and reduces the height at which the edge field of view converges on the image plane, thus helping to reduce the screen size. Attached Figure Description

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

[0020] Figure 1 The diagram shows the propagation path of light within the optical imaging system according to Embodiment 1 of this application;

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

[0022] Figure 3 , Figure 4 and Figure 5 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Embodiment 1 of this application are shown respectively.

[0023] Figure 6 The diagram shows the propagation path of light within the optical imaging system according to Embodiment 2 of this application;

[0024] Figure 7 A schematic diagram of the structure of an optical imaging system according to Embodiment 2 of this application is shown;

[0025] Figure 8 , Figure 9 and Figure 10 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Embodiment 2 of this application are shown respectively.

[0026] Figure 11 The diagram shows the propagation path of light within the optical imaging system according to Embodiment 3 of this application;

[0027] Figure 12 A schematic diagram of the structure of an optical imaging system according to Embodiment 3 of this application is shown;

[0028] Figure 13 , Figure 14 and Figure 15 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Embodiment 3 of this application are shown respectively.

[0029] Figure 16 A diagram showing the propagation path of light within an optical imaging system according to Embodiment 4 of this application is provided.

[0030] Figure 17 A schematic diagram of the structure of an optical imaging system according to Embodiment 4 of this application is shown;

[0031] Figure 18 , Figure 19 and Figure 20 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Embodiment 4 of this application are shown respectively.

[0032] Figure 21 A diagram showing the propagation path of light within an optical imaging system according to Embodiment 5 of this application is provided.

[0033] Figure 22A schematic diagram of the structure of an optical imaging system according to Embodiment 5 of this application is shown; and

[0034] Figure 23 , Figure 24 and Figure 25 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Embodiment 5 of this application are shown respectively. Detailed Implementation

[0035] 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.

[0036] 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 side discussed below may also be referred to as the second side, the second side may also be referred to as the first side, and the first lens may also be referred to as the second lens, etc.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The features, principles and other aspects of this application are described in detail below.

[0043] An optical imaging system according to an exemplary embodiment of this application may include a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, and a third lens arranged sequentially along an optical axis from a first side to a second side, wherein the second side of the third lens may have a partially reflective layer.

[0044] In an exemplary embodiment, the optical imaging system of this application can satisfy the condition N2>N1 or N2>N3, and can also satisfy the condition -4.0<f1×N1 / R2<-2.0, where N2 is the refractive index of the second lens, N1 is the refractive index of the first lens, N3 is the refractive index of the third lens, f1 is the effective focal length of the first lens, and R2 is the radius of curvature of the second side surface of the first lens.

[0045] In an exemplary embodiment, the first side may be, for example, the receiving side, and the second side may be, for example, the transmitting side. In an exemplary embodiment, the receiving side may be, for example, the human eye side, and the transmitting side may be, for example, the display side. The optical imaging system can be used in various VR display devices. In the optical imaging system, the first side of each element is the surface of the optical element that is near the receiving / human eye side and away from the transmitting / display side, and the second side is the surface of the optical element that is near the transmitting / display side and away from the receiving / human eye side.

[0046] An optical imaging system according to an exemplary embodiment of this application comprises a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, and a third lens arranged sequentially along the optical axis from the first side to the second side, wherein the second side of the third lens has a partially reflective layer; and the refractive indices N1, N2, and N3 of the first, second, and third lenses are controlled to satisfy the condition N2>N1 or N2>N3, and the effective focal length f1 of the first lens, its refractive index N1, and the radius of curvature R2 of its second side satisfy the condition -4.0<f1×N1 / R2<-2.0. This system can achieve optical path reflection, shorten the length of the optical system, and facilitate the miniaturization of virtual reality devices; it can reasonably control the shape of the lenses, which is beneficial for the convergence of edge rays and the correction of chromatic aberration in the system; at the same time, it can help increase the field of view of the system, reduce the height at which the edge field of view converges at the image plane, and help reduce the size of the screen.

[0047] In an exemplary embodiment, the first side of the second lens can be a plane, and the reflective polarizing element can be attached to the first side of the second lens, that is, the second side of the reflective polarizing element can be attached to the first side of the second lens.

[0048] In an exemplary embodiment, the second side surface of the second lens can be concave, and the quarter-wave plate can be attached to the second side surface of the second lens, that is, the first side surface of the quarter-wave plate can be attached to the second side surface of the second lens.

[0049] In an exemplary embodiment, the second side of the third lens may have a partially reflective layer. The first side of the partially reflective layer may be attached to the second side of the third lens.

[0050] The following will refer to Figure 1 and Figure 2 An exemplary description of an optical imaging system is provided. For example... Figure 1 and Figure 2As shown, the optical imaging system according to an exemplary embodiment of the present application may include a first lens E1, a reflective polarizing element RP, a second lens E2, a quarter-wave plate QWP, and a third lens E3 arranged in sequence from the first side (reception part side J) to the second side (emission part side F). Among them, the second side surface of the reflective polarizing element RP is adhered to the first side surface of the second lens E2, the first side surface of the quarter-wave plate QWP is adhered to the second side surface of the second lens E2, and the second side surface of the third lens E3 has a partial reflection layer BS. In actual use, the optical imaging system according to an exemplary embodiment of the present application can be used as a VR lens. At this time, the reception part side J corresponds to the human eye side, and the emission part side F corresponds to the display side. The light beam emitted from the emission part side F (such as a light source display) can sequentially pass through the partial reflection layer BS located on the second side surface of the third lens E3, the third lens E3, the quarter-wave plate QWP, and the second lens E2, reach the reflective polarizing element RP, be reflected at the reflective polarizing element RP and then pass through the second lens E2, the quarter-wave plate QWP, and the third lens E3 again, reach the partial reflection layer BS located on the second side surface of the third lens E3. After that, the light beam is reflected again at the partial reflection layer BS and sequentially passes through the third lens E3, the quarter-wave plate QWP, the second lens E2, the reflective polarizing element RP, and the first lens E1 to be emitted toward the reception part side J (such as the human eye side). In the exemplary embodiment, the partial reflection layer BS may be a semi-transmissive and semi-reflective film layer plated on the second side surface of the third lens E3.

[0051] In the exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expressions ImgH < 13.0 mm and Semi-FOV > 50°, where ImgH is half of the diagonal length of the effective pixel area on the emission part located on the second side of the optical imaging system, and Semi-FOV is half of the maximum viewing angle of the optical imaging system. By controlling the half of the diagonal length of the effective pixel area on the emission part located on the second side of the optical imaging system and the half of the maximum viewing angle of the optical imaging system within this range respectively, the height of the light is reduced, which is beneficial to reducing the size of the screen and the miniaturization of the device; at the same time, the viewing angle of the system is increased, which is beneficial to enhancing the immersive experience of the user.

[0052] In the exemplary embodiment, the first side surface of the second lens may be a plane, the reflective polarizing element may be attached to the first side surface of the second lens, and the optical imaging system of the present application may satisfy the conditional expression NRP < N2, where NRP is the refractive index of the reflective polarizing element and N2 is the refractive index of the second lens. By controlling the refractive indices of the reflective polarizing element and the second lens, making the refractive index of the second lens greater than that of the reflective polarizing element, it is beneficial to reducing the influence of the thickness change of the reflective polarizing element on the performance of the optical system.

[0053] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula CT3 > CT1 > CT2, where CT3 is the central thickness of the third lens on the optical axis, CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis. By controlling the central thicknesses of the first lens, the second lens, and the third lens, such that the central thickness of the third lens is greater than that of the first lens, and the central thickness of the first lens is greater than that of the second lens. On the one hand, increasing the central thickness of the third lens is conducive to increasing the length of the reflection path of the refracted light, shortening the total length of the optical system, and miniaturizing the VR device. On the other hand, appropriate central thickness is conducive to the processing and shaping of the lens.

[0054] In an exemplary embodiment, the second side of the third lens has a partial reflection layer, and the optical imaging system of the present application can satisfy the conditional formula NBS = N3, where NBS is the refractive index of the partial reflection layer located on the second side of the third lens, and N3 is the refractive index of the third lens. By controlling the refractive index of the partial reflection layer located on the second side of the third lens and the refractive index of the third lens, and making the refractive indices of the two equal, the direction of light can be reasonably controlled, so that the change in light when passing through the third lens from the partial reflection layer is small, which is conducive to correcting the chromatic aberration of the system, thereby improving the imaging quality of the system.

[0055] In an exemplary embodiment, the second side of the second lens can be a concave surface, the quarter-wave plate can be attached to the second side of the second lens, and the optical imaging system of the present application can satisfy the conditional formula Nqwp < N2, where Nqwp is the refractive index of the quarter-wave plate, and N2 is the refractive index of the second lens. By controlling the second side of the second lens to be a concave surface, and controlling the refractive index of the second lens and the refractive index of the quarter-wave plate, such that the optical power of the second side of the second lens is negative, it is conducive to the convergence of light when the system increases the field of view, thereby improving the imaging quality. Additionally, controlling the refractive index of the second lens to be greater than the refractive index of the quarter-wave plate is conducive to reducing the influence of the thickness change of the quarter-wave plate on the optical system, thereby selecting a polarizing element with the optimal polarization state.

[0056] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 1.5 < CT2 / T12 < 7.6, where CT2 is the central thickness of the second lens on the optical axis, and T12 is the air gap between the first lens and the second lens on the optical axis. By controlling the ratio of the central thickness of the second lens on the optical axis to the air gap between the first lens and the second lens on the optical axis within this range, while ensuring the formability of the lens, the first lens and the second lens are arranged compactly, which is conducive to the miniaturization of the VR device.

[0057] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula -0.2 < f / R1 < 0.2, where f is the effective focal length of the optical imaging system, and R1 is the radius of curvature of the first side surface of the first lens. By controlling the ratio of the effective focal length of the optical imaging system to the radius of curvature of the first side surface of the first lens within this range, while controlling the shape of the first lens, it is beneficial to increase the field angle of the system.

[0058] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula -5.0 < f3 / (R5 + R6) < 15.0, where f3 is the effective focal length of the third lens, R5 is the radius of curvature of the first side surface of the third lens, and R6 is the radius of curvature of the second side surface of the third lens. By controlling the effective focal length of the third lens and the radii of curvature of the first and second side surfaces of the third lens to satisfy the conditional formula -5.0 < f3 / (R5 + R6) < 15.0, on the one hand, it restricts the shape of the third lens, which is beneficial to reducing the height of the light rays, thereby reducing the size of the screen; on the other hand, it is beneficial to reducing the intensity of the ghost image generated by the reflection between the second lens and the screen.

[0059] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula -3.0 < f2×N2 / R4 < 1.5, where f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and R4 is the radius of curvature of the second side surface of the second lens. By controlling the effective focal length and refractive index of the second lens and the radius of curvature of the second side surface of the second lens to satisfy the conditional formula -3.0 < f2×N2 / R4 < 1.5, the bending shape and optical power of the second side surface of the second lens are reasonably controlled, which is beneficial to the attachment of the quarter-wave plate; in addition, it is beneficial to the convergence of the refolded light rays, thereby improving the imaging quality.

[0060] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 0.5 < T23 / ∑AT < 1.0, where T23 is the air gap between the second lens and the third lens on the optical axis, and ∑AT is the sum of the air gaps between any two adjacent lenses with optical power on the optical axis in the optical imaging system. For example, ∑AT can be equal to the sum of T12 and T23. By controlling the ratio of the air gap between the second lens and the third lens on the optical axis to the sum of the air gaps between any two adjacent lenses with optical power between the first lens and the lens closest to the second side (emitting part side) on the optical axis within this range, the arrangement of the lenses is made compact, shortening the total length of the optical system, which is beneficial to reducing the volume and weight of the VR device.

[0061] In an exemplary embodiment, the optical imaging system of this application can satisfy the condition -1.5 < f1 × N1 / (R1 - R2) < 0.5, where f1 is the effective focal length of the first lens, N1 is the refractive index of the first lens, R1 is the radius of curvature of the first side surface of the first lens, and R2 is the radius of curvature of the second side surface of the first lens. By controlling the effective focal length and refractive index of the first lens, as well as the radii of curvature of the two sides of the first lens, to satisfy the condition -1.5 < f1 × N1 / (R1 - R2) < 0.5, the shape of the lens can be reasonably controlled, which is beneficial to increasing the field of view of the system.

[0062] In an exemplary embodiment, the optical imaging system of this application can satisfy the condition 1.0 < DT32 / DT11 < 1.6, where DT32 is the maximum effective radius of the second side surface of the third lens, and DT11 is the maximum effective radius of the first side surface of the first lens. By controlling the ratio of the maximum effective radius of the second side surface of the third lens to the maximum effective radius of the first side surface of the first lens within this range, while keeping the maximum effective radius of the second side surface of the third lens constant, increasing the maximum effective radius of the first side surface of the first lens is beneficial for increasing the field of view at the same image height.

[0063] In an exemplary embodiment, the optical imaging 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 optical imaging system; for example, the aperture stop can be located between the first side (receiving side) and the first lens.

[0064] In an exemplary embodiment, the optical imaging system may optionally include a protective glass for protecting a photosensitive element, such as that on a light source display, located on the emitting side.

[0065] In an exemplary embodiment, the lens included in the optical imaging system may have at least one aspherical mirror. Aspherical mirrors have better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. By using aspherical mirrors, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0066] The optical imaging system according to the above-described embodiment of the present application sequentially includes, from the first side to the second side along the optical axis, a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, and a third lens. Among them, the second side surface of the third lens has a partial reflection layer. The refractive indices N1, N2, and N3 of the first lens, the second lens, and the third lens satisfy the conditional formula N2 > N1 or N2 > N3; the effective focal length f1 of the first lens, the refractive index N1 of the first lens, and the curvature radius R2 of the second side surface of the first lens satisfy the conditional formula -4.0 < f1 × N1 / R2 < -2.0. By providing a reflective polarizing element and a quarter-wave plate on the first side and the second side of the second lens respectively, where the reflective polarizing element can transmit light of a certain polarization direction and reflect polarized light orthogonal to this polarization direction; the quarter-wave plate can convert between linearly polarized light and circularly polarized light; combined with the partial reflection layer of the third lens, the folding and reflection of the optical path can be achieved, shortening the length of the optical system, which is beneficial to the miniaturization of virtual reality devices. By controlling the refractive indices of the first lens, the second lens, and the third lens, making the refractive index of the second lens greater than the refractive index of the first lens or the refractive index of the second lens greater than the refractive index of the third lens, the shape of the lens can be controlled, which is beneficial to the convergence of marginal rays and the correction of chromatic aberration of the system. By controlling the effective focal length, refractive index, and the curvature radius of the second side surface of the first lens, it is beneficial to increase the field angle of the system, reduce the height at which the marginal field converges on the image plane, and is beneficial to reducing the size of the screen.

[0067] On the other hand, an exemplary embodiment of the present application further provides an optical imaging system, which includes a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, and a third lens arranged in sequence from the first side to the second side along the optical axis. Among them, the second side surface of the third lens has a partial reflection layer; and, the central thickness CT2 of the second lens on the optical axis and the air gap T12 between the first lens and the second lens on the optical axis satisfy the conditional formula 1.5 < CT2 / T12 < 7.6. By such an arrangement of the optical imaging system, the folding and reflection of the optical path can be achieved, shortening the length of the optical system; at the same time, while ensuring the formability of the lens, the first lens and the second lens can be arranged compactly, which is beneficial to the miniaturization and thinning of virtual reality devices.

[0068] On the other hand, an exemplary embodiment of the present application further provides an optical imaging system, which includes a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, and a third lens arranged in sequence along the optical axis from the first side to the second side. Among them, the second side of the third lens has a partial reflection layer; and, the effective focal length f3 of the third lens and the curvature radii R5 and R6 of the first side and the second side of the third lens satisfy the conditional formula -5.0 < f3 / (R5 + R6) < 15.0. Through this setting of the optical imaging system, the refraction and reflection of the optical path can be achieved, the length of the optical system can be shortened, which is beneficial to the miniaturization of virtual reality devices; in addition, the shape of the third lens can be reasonably constrained, which is beneficial to reducing the height of light rays, thereby reducing the size of the screen; at the same time, it is also beneficial to reducing the intensity of ghost images generated by reflection between the second lens and the screen, and improving the imaging quality.

[0069] On the other hand, an exemplary embodiment of the present application further provides an optical imaging system, which includes a first lens, a reflective polarizing element, a second lens, a quarter-wave plate, and a third lens arranged in sequence along the optical axis from the first side to the second side. Among them, the second side of the third lens has a partial reflection layer; and, the effective focal length f2 of the second lens, the refractive index N2 of the second lens, and the curvature radius R4 of the second side of the second lens satisfy the conditional formula -3.0 < f2×N2 / R4 < 1.5. Through this setting of the optical imaging system, the refraction and reflection of the optical path can be achieved, the length of the optical system can be shortened, which is beneficial to the miniaturization of virtual reality devices; the bending shape and optical power of the second side of the second lens can be reasonably controlled, which is beneficial to the attachment of the quarter-wave plate; at the same time, it is also beneficial to the convergence of the refracted and reflected light rays, thereby improving the imaging quality.

[0070] On yet another aspect, the present application further provides a VR device, which includes the optical imaging system provided in any of the above exemplary embodiments of the present application. For this VR device, its first side / receiving part side can be the human eye side, and its second side / transmitting part side can be the display side.

[0071] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number and form of lenses constituting the optical imaging system can be reasonably set to obtain the various results and advantages described in this specification, and the present application does not make specific limitations in this regard.

[0072] Next, a specific embodiment of the optical imaging system applicable to the above embodiments will be further described with reference to the accompanying drawings.

[0073] Example 1

[0074] The following refers to Figure 1 and Figure 2 describe the optical imaging system according to Embodiment 1 of the present application. Figure 1 The diagram shows the propagation path of light within the optical imaging system according to this embodiment. Figure 2 A schematic diagram of the optical imaging system of this embodiment is shown.

[0075] like Figure 2 As shown, the optical imaging system includes, from the first side to the second side, an aperture stop STO, a first lens E1, a reflective polarizing element RP, a second lens E2, a quarter-wave plate QWP, a third lens E3, and a partially reflective layer BS along the optical axis. The first side is the receiving side, and the second side can be the emitting side. The reflective polarizing element RP is attached to the first side of the second lens E2 (near the receiving side surface), the quarter-wave plate QWP is attached to the second side of the second lens E2 (near the emitting side surface), and the partially reflective layer BS is attached to the second side of the third lens E3 (near the emitting side surface).

[0076] In this embodiment, the first lens E1 has a first side surface S1 and a second side surface S2, wherein the first side surface S1 is concave and the second side surface S2 is convex. The second lens E2 has a first side surface S3 and a second side surface S4, wherein the first side surface S3 is planar and the second side surface S4 is concave. The third lens E3 has a first side surface S5 and a second side surface S6, wherein the first side surface S5 is convex and the second side surface S6 is convex.

[0077] like Figure 1 As shown, and in combination Figure 2 In this embodiment, the light beam emitted from the emitting unit F (e.g., a display) passes sequentially through the partial reflective layer BS, the third lens E3, the quarter-wave plate QWP, and the second lens E2, and reaches the reflective polarizing element RP. The light beam is reflected at the reflective polarizing element RP and passes again through the second lens E2, the quarter-wave plate QWP, and the third lens E3, reaching the partial reflective layer BS located on the second side of the third lens E3. After that, the light beam is reflected again at the partial reflective layer BS and passes sequentially through the third lens E3, the quarter-wave plate QWP, the second lens E2, the reflective polarizing element RP, and the first lens E1 to exit toward the receiving unit J (e.g., a human eye).

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

[0079]

[0080] Table 1

[0081] In this embodiment, the first side surface S1 and the second side surface S2 of the first lens E1, the second side surface S4 of the second lens E2, and the first side surface S5 and the second side surface S6 of the third lens E3 are all aspherical surfaces. The surface shape of the aspherical lens... The following aspherical formulas can be used for limitation:

[0082] (1)

[0083] 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 gives the conic coefficients that can be used for aspherical mirrors S1, S2, S4, S5 and S6 in this embodiment. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 .

[0084]

[0085] Table 2

[0086] Figure 3 The on-axis chromatic aberration curve of the optical imaging system of Embodiment 1 is shown, which represents the deviation of the convergence focal point after light of different wavelengths passes through the optical imaging system. Figure 4 The astigmatism curves of the optical imaging system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curves of the optical imaging system of Example 1 are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 3 to 5 It can be seen that the optical imaging system given in Example 1 can achieve good imaging quality.

[0087] Example 2

[0088] The following is for reference Figure 6 and Figure 7 Describes an optical imaging system according to Embodiment 2 of this application. Figure 6 The diagram shows the propagation path of light within the optical imaging system according to this embodiment. Figure 7 A schematic diagram of the optical imaging system of this embodiment is shown.

[0089] like Figure 7 As shown, the optical imaging system includes, from the first side to the second side, an aperture stop STO, a first lens E1, a reflective polarizing element RP, a second lens E2, a quarter-wave plate QWP, a third lens E3, and a partially reflective layer BS along the optical axis. The first side is the receiving side, and the second side can be the emitting side. The reflective polarizing element RP is attached to the first side of the second lens E2 (near the receiving side surface), the quarter-wave plate QWP is attached to the second side of the second lens E2 (near the emitting side surface), and the partially reflective layer BS is attached to the second side of the third lens E3 (near the emitting side surface).

[0090] In this embodiment, the first lens E1 has a first side surface S1 and a second side surface S2, wherein the first side surface S1 is concave and the second side surface S2 is convex. The second lens E2 has a first side surface S3 and a second side surface S4, wherein the first side surface S3 is planar and the second side surface S4 is concave. The third lens E3 has a first side surface S5 and a second side surface S6, wherein the first side surface S5 is convex and the second side surface S6 is convex.

[0091] like Figure 6 As shown, and in combination Figure 7 In this embodiment, the light beam emitted from the emitting unit F (e.g., a display) passes sequentially through the partial reflective layer BS, the third lens E3, the quarter-wave plate QWP, and the second lens E2, and reaches the reflective polarizing element RP. The light beam is reflected at the reflective polarizing element RP and passes again through the second lens E2, the quarter-wave plate QWP, and the third lens E3, reaching the partial reflective layer BS located on the second side of the third lens E3. After that, the light beam is reflected again at the partial reflective layer BS and passes sequentially through the third lens E3, the quarter-wave plate QWP, the second lens E2, the reflective polarizing element RP, and the first lens E1 to exit toward the receiving unit J (e.g., a human eye).

[0092] Table 3 shows the basic parameters of the optical imaging system in this embodiment, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the first side surface S1 and the second side surface S2 of the first lens E1, the second side surface S4 of the second lens E2, and the first side surface S5 and the second side surface S6 of the third lens E3 are all aspherical surfaces. Table 4 shows the conic coefficients of the aspherical mirror surfaces S1, S2, S4, S5, and S6 that can be used in this embodiment. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0093]

[0094] Table 3

[0095]

[0096] Table 4

[0097] Figure 8 The on-axis chromatic aberration curve of the optical imaging system of Embodiment 2 is shown, which represents the deviation of the convergence focal point after light of different wavelengths passes through the optical imaging system. Figure 9 The astigmatism curves of the optical imaging system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 10 The distortion curves of the optical imaging system of Example 2 are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 8 to 10 It can be seen that the optical imaging system given in Example 2 can achieve good imaging quality.

[0098] Example 3

[0099] The following is for reference Figure 11 and Figure 12 Describes an optical imaging system according to Embodiment 3 of this application. Figure 11 The diagram shows the propagation path of light within the optical imaging system according to this embodiment. Figure 12 A schematic diagram of the optical imaging system of this embodiment is shown.

[0100] like Figure 12 As shown, the optical imaging system includes, from the first side to the second side, an aperture stop STO, a first lens E1, a reflective polarizing element RP, a second lens E2, a quarter-wave plate QWP, a third lens E3, and a partially reflective layer BS along the optical axis. The first side is the receiving side, and the second side can be the emitting side. The reflective polarizing element RP is attached to the first side of the second lens E2 (near the receiving side surface), the quarter-wave plate QWP is attached to the second side of the second lens E2 (near the emitting side surface), and the partially reflective layer BS is attached to the second side of the third lens E3 (near the emitting side surface).

[0101] In this embodiment, the first lens E1 has a first side surface S1 and a second side surface S2, wherein the first side surface S1 is convex and the second side surface S2 is convex. The second lens E2 has a first side surface S3 and a second side surface S4, wherein the first side surface S3 is planar and the second side surface S4 is concave. The third lens E3 has a first side surface S5 and a second side surface S6, wherein the first side surface S5 is convex and the second side surface S6 is convex.

[0102] like Figure 11 As shown, and in combination Figure 12 In this embodiment, the light beam emitted from the emitting unit F (e.g., a display) passes sequentially through the partial reflective layer BS, the third lens E3, the quarter-wave plate QWP, and the second lens E2, and reaches the reflective polarizing element RP. The light beam is reflected at the reflective polarizing element RP and passes again through the second lens E2, the quarter-wave plate QWP, and the third lens E3, reaching the partial reflective layer BS located on the second side of the third lens E3. After that, the light beam is reflected again at the partial reflective layer BS and passes sequentially through the third lens E3, the quarter-wave plate QWP, the second lens E2, the reflective polarizing element RP, and the first lens E1 to exit toward the receiving unit J (e.g., a human eye).

[0103] Table 5 shows the basic parameters of the optical imaging system in this embodiment, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the first side surface S1 and the second side surface S2 of the first lens E1, the second side surface S4 of the second lens E2, and the first side surface S5 and the second side surface S6 of the third lens E3 are all aspherical surfaces. Table 6 shows the conic coefficients of the aspherical mirror surfaces S1, S2, S4, S5, and S6 that can be used in this embodiment. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 ,A 12 , A 14 , A 16 , A 18 , A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0104]

[0105] Table 5

[0106]

[0107] Table 6

[0108] Figure 13 The on-axis chromatic aberration curve of the optical imaging system of this embodiment is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the optical imaging system. Figure 14 The astigmatism curves of the optical imaging system of this embodiment are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 15 The distortion curves of the optical imaging system of this embodiment are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 13 to 15 As can be seen, the optical imaging system provided in this embodiment can achieve good imaging quality.

[0109] Example 4

[0110] The following is for reference Figure 16 and Figure 17 An optical imaging system according to Embodiment 4 of this application is described. Figure 16 The diagram shows the propagation path of light within the optical imaging system according to this embodiment. Figure 17 A schematic diagram of the optical imaging system of this embodiment is shown.

[0111] like Figure 17 As shown, the optical imaging system includes, from the first side to the second side, an aperture stop STO, a first lens E1, a reflective polarizing element RP, a second lens E2, a quarter-wave plate QWP, a third lens E3, and a partially reflective layer BS along the optical axis. The first side is the receiving side, and the second side can be the emitting side. The reflective polarizing element RP is attached to the first side of the second lens E2 (near the receiving side surface), the quarter-wave plate QWP is attached to the second side of the second lens E2 (near the emitting side surface), and the partially reflective layer BS is attached to the second side of the third lens E3 (near the emitting side surface).

[0112] In this embodiment, the first lens E1 has a first side surface S1 and a second side surface S2, wherein the first side surface S1 is concave and the second side surface S2 is convex. The second lens E2 has a first side surface S3 and a second side surface S4, wherein the first side surface S3 is planar and the second side surface S4 is concave. The third lens E3 has a first side surface S5 and a second side surface S6, wherein the first side surface S5 is convex and the second side surface S6 is convex.

[0113] like Figure 16 As shown, and in combination Figure 17 In this embodiment, the light beam emitted from the emitting unit F (e.g., a display) passes sequentially through the partial reflective layer BS, the third lens E3, the quarter-wave plate QWP, and the second lens E2, and reaches the reflective polarizing element RP. The light beam is reflected at the reflective polarizing element RP and passes again through the second lens E2, the quarter-wave plate QWP, and the third lens E3, reaching the partial reflective layer BS located on the second side of the third lens E3. After that, the light beam is reflected again at the partial reflective layer BS and passes sequentially through the third lens E3, the quarter-wave plate QWP, the second lens E2, the reflective polarizing element RP, and the first lens E1 to exit toward the receiving unit J (e.g., a human eye).

[0114] Table 7 shows the basic parameters of the optical imaging system in this embodiment, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the first side surface S1 and the second side surface S2 of the first lens E1, the second side surface S4 of the second lens E2, and the first side surface S5 and the second side surface S6 of the third lens E3 are all aspherical surfaces. Table 8 shows the conic coefficients of the aspherical mirror surfaces S1, S2, S4, S5, and S6 that can be used in this embodiment. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0115]

[0116] Table 7

[0117]

[0118] Table 8

[0119] Figure 18 The on-axis chromatic aberration curve of the optical imaging system of this embodiment is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the optical imaging system. Figure 19 The astigmatism curves of the optical imaging system of this embodiment are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 20 The distortion curves of the optical imaging system of this embodiment are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 18 to 20 As can be seen, the optical imaging system provided in this embodiment can achieve good imaging quality.

[0120] Example 5

[0121] The following is for reference Figure 21 and Figure 22 An optical imaging system according to Embodiment 5 of this application is described. Figure 21 The diagram shows the propagation path of light within the optical imaging system according to this embodiment. Figure 22 A schematic diagram of the optical imaging system of this embodiment is shown.

[0122] like Figure 22 As shown, the optical imaging system includes, from the first side to the second side, an aperture stop STO, a first lens E1, a reflective polarizing element RP, a second lens E2, a quarter-wave plate QWP, a third lens E3, and a partially reflective layer BS along the optical axis. The first side is the receiving side, and the second side can be the emitting side. The reflective polarizing element RP is attached to the first side of the second lens E2 (near the receiving side surface), the quarter-wave plate QWP is attached to the second side of the second lens E2 (near the emitting side surface), and the partially reflective layer BS is attached to the second side of the third lens E3 (near the emitting side surface).

[0123] In this embodiment, the first lens E1 has a first side surface S1 and a second side surface S2, wherein the first side surface S1 is concave and the second side surface S2 is convex. The second lens E2 has a first side surface S3 and a second side surface S4, wherein the first side surface S3 is planar and the second side surface S4 is concave. The third lens E3 has a first side surface S5 and a second side surface S6, wherein the first side surface S5 is convex and the second side surface S6 is convex.

[0124] like Figure 21 As shown, and in combination Figure 22In this embodiment, the light beam emitted from the emitting unit F (e.g., a display) passes sequentially through the partial reflective layer BS, the third lens E3, the quarter-wave plate QWP, and the second lens E2, and reaches the reflective polarizing element RP. The light beam is reflected at the reflective polarizing element RP and passes again through the second lens E2, the quarter-wave plate QWP, and the third lens E3, reaching the partial reflective layer BS located on the second side of the third lens E3. After that, the light beam is reflected again at the partial reflective layer BS and passes sequentially through the third lens E3, the quarter-wave plate QWP, the second lens E2, the reflective polarizing element RP, and the first lens E1 to exit toward the receiving unit J (e.g., a human eye).

[0125] Table 9 shows the basic parameters of the optical imaging system in this embodiment, where the units for radius of curvature and thickness are millimeters (mm). In this embodiment, the first side surface S1 and the second side surface S2 of the first lens E1, the second side surface S4 of the second lens E2, and the first side surface S5 and the second side surface S6 of the third lens E3 are all aspherical surfaces. Table 10 shows the conic coefficients of the aspherical mirror surfaces S1, S2, S4, S5, and S6 that can be used in this embodiment. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0126]

[0127] Table 9

[0128]

[0129] Table 10

[0130] Figure 23 The on-axis chromatic aberration curve of the optical imaging system of this embodiment is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the optical imaging system. Figure 24 The astigmatism curves of the optical imaging system of this embodiment are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 25The distortion curves of the optical imaging system of this embodiment are shown, representing the distortion magnitude values ​​corresponding to different half-field angles. According to... Figures 23 to 25 As can be seen, the optical imaging system provided in this embodiment can achieve good imaging quality.

[0131] Furthermore, in Examples 1 to 5, the effective focal length f1 of the first lens E1, the effective focal length f2 of the second lens E2, the effective focal length f3 of the third lens E3, half of the maximum field of view of the optical imaging system (Semi-FOV), and half of the diagonal length of the effective pixel area on the emitting part (e.g., display) of the optical imaging system (ImgH) are shown in Table 11.

[0132]

[0133] Table 11

[0134] Examples 1 to 5 respectively satisfy the conditions shown in Table 12.

[0135]

[0136] Table 12

[0137] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of 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. An optical imaging system, characterized by, comprises, in order from the first side to the second side along the optical axis, a first lens, a reflective polarizing element, a second lens, a quarter wave plate, and a third lens, wherein the first lens has positive refractive power, and a second side surface thereof is a convex surface; the second lens has negative refractive power, and a first side surface thereof is a plane, and a second side surface thereof is a concave surface; the third lens has positive refractive power, and a first side surface thereof is a convex surface, and a second side surface thereof is a convex surface; the second side surface of the third lens has a partial reflection layer; the number of lenses having refractive power in the optical imaging system is three; and the optical imaging system satisfies: N2>N1 or N2>N3; and satisfies: -3.86≤f1×N1 / R2≤-2.36, -4.62≤f3 / (R5+R6)≤-2.83, -3.0<f2×N2 / R4≤-2.54; wherein N2 is the refractive index of the second lens, N1 is the refractive index of the first lens, N3 is the refractive index of the third lens, f1 is the effective focal length of the first lens, R2 is the curvature radius of the second side surface of the first lens, f3 is the effective focal length of the third lens, R5 is the curvature radius of the first side surface of the third lens, R6 is the curvature radius of the second side surface of the third lens, f2 is the effective focal length of the second lens, and R4 is the curvature radius of the second side surface of the second lens.

2. The optical imaging system of claim 1, wherein, the optical imaging system further comprises an emitting portion located at the second side, and a half of the diagonal length of an effective pixel area on the emitting portion ImgH and a half of the maximum field of view angle of the optical imaging system Semi-FOV satisfy: 12.71mm≤ImgH<13.0mm and 51°≤Semi-FOV≤52.7°.

3. The optical imaging system of claim 1, wherein, the reflective polarizing element is attached to the first side surface of the second lens; and the refractive index NRP of the reflective polarizing element and the refractive index N2 of the second lens satisfy: NRP<N2.

4. The optical imaging system of claim 1, wherein, the central thickness CT3 of the third lens on the optical axis, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: CT3>CT1>CT2.

5. The optical imaging system of claim 1, wherein, the refractive index NBS of the partial reflection layer and the refractive index N3 of the third lens satisfy: NBS=N3.

6. The optical imaging system of claim 1, wherein, the quarter wave plate is attached to the second side surface of the second lens; and the refractive index Nqwp of the quarter wave plate and the refractive index N2 of the second lens satisfy: Nqwp<N2.

7. The optical imaging system of claim 1, wherein, the central thickness CT2 of the second lens on the optical axis and the air gap T12 of the first lens and the second lens on the optical axis satisfy: 1.64≤CT2 / T12≤7.

54.

8. The optical imaging system according to any one of claims 1 to 7, characterized in that, the effective focal length f of the optical imaging system and the curvature radius R1 of the first side surface of the first lens satisfy: -0.13≤f / R1≤0.

1.

9. The optical imaging system according to any one of claims 1 to 7, characterized in that, the air gap T23 of the second lens and the third lens on the optical axis and the sum ∑AT of the air gaps of any two adjacent lenses having refractive power in the optical imaging system on the optical axis satisfy: 0.5 < T23 / ∑AT ≤ 0.

86.

10. The optical imaging system of any one of claims 1 to 7, wherein, An effective focal length f1 of the first lens, a refractive index N1 of the first lens, a curvature radius R1 of a first side of the first lens, and a curvature radius R2 of a second side of the first lens satisfy: -1.5 < f1 x N1 / (R1 - R2) ≤ 0.

41.

11. The optical imaging system of any one of claims 1 to 7, wherein, A maximum effective radius DT32 of the second side of the third lens and a maximum effective radius DT11 of the first side of the first lens satisfy: 1.33 ≤ DT32 / DT11 ≤ 1.

51.

12. A VR device comprising the optical imaging system of any of claims 1-11, wherein, The first side is a receiving portion side, and the second side is a transmitting portion side.

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