Virtual reality device

Abstract

The utility model discloses a virtual reality device. The virtual reality device comprises a first optical system and a second optical system, the first optical system sequentially comprises a first lens, a reflective polarizing element, a quarter-wave plate, a second lens and a third lens from the first side to the second side along the first optical axis, and the second side face of the third lens is a convex face. The second optical system sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from the object side to the image side along the second optical axis; a seventh lens with positive focal power and an eighth lens with positive focal power; the axial distance TD'from the first side surface of the first lens to the second side surface of the third lens, the total effective focal length f 'of the first optical system, the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens and the total effective focal length f of the second optical system satisfy 4.5 lt; (TD ' / f') * (TD / f) lt; and 8.6.

Description

Technical Field

[0001] The present application relates to the field of optical devices, and in particular to a virtual reality device. Background Art

[0002] With the development of virtual reality technology, virtual reality devices have gradually transitioned from a single magnifying projection tool to a linkage interaction device. In order to meet the needs of linkage interaction, virtual reality devices usually include two forms of lenses, such as a visual lens and a positioning lens. The positioning lens obtains environmental information, and when used with the visual lens, it can connect the real world with the virtual world to achieve interaction between the real world and the virtual world. However, this virtual reality device composed of multiple lenses is large in size and heavy in weight, which seriously affects the user's immersive experience. Utility Model Content

[0003] The present application provides a virtual reality device that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0004] One aspect of the present application provides a virtual reality device, which includes a first optical system and a second optical system; the first optical system includes a first lens, a reflective polarizing element, a quarter-wave plate, a second lens and a third lens in sequence from the first side to the second side along the first optical axis, and the second side surface of the third lens is a convex surface; the second optical system includes in sequence from the object side to the image side along the second optical axis: a first lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens with negative optical power, whose object side surface is concave and whose image side surface is concave; a third lens with positive optical power, whose object side surface is convex and whose image side surface is concave; a fourth lens with positive optical power, whose image side surface is convex; a fifth lens with positive optical power, whose object side surface is convex and whose image side surface is concave. The surface is convex; the sixth lens with negative optical power has a concave object side surface; the seventh lens with positive optical power has a convex object side surface; and the eighth lens with positive optical power has a convex object side surface and a concave image side surface; wherein the real image formed by the second optical system is transmitted to the display screen on the second side of the first optical system in the form of an electrical signal, and the first optical system is used to project the virtual image of the display screen and the real image transmitted to the display screen; the axial distance TD' from the first side surface of the first lens to the second side surface of the third lens, the total effective focal length f' of the first optical system, the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens and the total effective focal length f of the second optical system satisfy: 4.5<(TD' / f')×(TD / f)<8.6.

[0005] According to an exemplary embodiment of the present application, the total effective focal length f' of the first optical system, the entrance pupil diameter EPD' of the first optical system, the total effective focal length f of the second optical system and the entrance pupil diameter EPD of the second optical system satisfy: 2.4<(f' / EPD') / (f / EPD)<5.2.

[0006] According to an exemplary embodiment of the present application, the sum ΣCT' of the center thickness of each lens of the first lens to the third lens on the first optical axis and the sum ΣCT of the center thickness of each lens of the first lens to the eighth lens on the second optical axis satisfy: 0.7<ΣCT' / ΣCT<2.5.

[0007] According to an exemplary embodiment of the present application, the maximum field of view FOV' of the first optical system and the maximum field of view FOV of the second optical system satisfy: 103°<(FOV-FOV')<119°.

[0008] According to an exemplary embodiment of the present application, the combined focal length f23' of the second lens and the third lens and the combined focal length fz' of the first lens, the reflective polarizing element and the quarter-wave plate satisfy: 0.4 <f23' / |fz'|<1.0。

[0009] According to an exemplary embodiment of the present application, the axial distance T12' from the second side surface of the first lens to the first side surface of the second lens, the center thickness CTR of the reflective polarizing element on the first optical axis, and the center thickness CTQ of the quarter-wave plate on the first optical axis satisfy: 2.2 <T12' / (CTR+CTQ)<3.6。

[0010] According to an exemplary embodiment of the present application, the curvature radius R1' of the first side surface of the first lens and the curvature radius R3' of the first side surface of the second lens satisfy: 0.1 <R1' / R3'<0.7。

[0011] According to an exemplary embodiment of the present application, the total effective focal length f' of the first optical system, the effective focal length f2' of the second lens and the effective focal length f3' of the third lens satisfy: -0.5 <f' / (f2'+f3')<0.1。

[0012] According to an exemplary embodiment of the present application, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the total effective focal length f of the second optical system satisfy: -7.7<(f1+f2) / f<-6.5.

[0013] According to an exemplary embodiment of the present application, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens satisfy: 0.5 <f3 / (f4+f5)<0.9。

[0014] According to an exemplary embodiment of the present application, the effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the effective focal length f7 of the seventh lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: 1.6<(f6 / R11)×(f7 / R13)<3.4.

[0015] According to an exemplary embodiment of the present application, the effective focal length f8 of the eighth lens and the center thickness CT8 of the eighth lens on the second optical axis satisfy: 4.2 <f8 / CT8<5.0。

[0016] According to an exemplary embodiment of the present application, the center thickness CT2 of the second lens on the second optical axis, the center thickness CT3 of the third lens on the second optical axis, the center thickness CT4 of the fourth lens on the second optical axis, and the center thickness CT5 of the fifth lens on the second optical axis satisfy: 2.6<(CT4+CT5) / (CT2+CT3)<3.0.

[0017] The virtual reality device provided by the present application is configured as a structure in which a first optical system and a second optical system are combined. The first optical system includes three lenses, a reflective polarizing element and a quarter wave plate. After the light passes through the quarter wave plate, the polarization state of the light changes. The light after the polarization state changes is reflected or transmitted at the reflective polarizing element, so that the light is refracted between the first lens and the third lens, effectively shortening the main body length of the first optical system. At the same time, the second lens and the third lens are similar to high-refractive index and low-refractive index cemented lenses, which is conducive to correcting the chromatic aberration of the first optical system; the second optical system uses eight lenses, and the first two lenses have negative focal lengths, which is conducive to increasing the field of view of the second optical system. Under the premise that the screen size of the first optical system and the chip size of the second optical system are determined, the focal lengths of the first optical system and the second optical system are basically determined. By controlling the ratio of the on-axis distance from the first side surface of the first lens to the second side surface of the third lens to the focal length of the first optical system and the ratio of the on-axis distance from the object side surface of the first lens to the image side surface of the eighth lens to the focal length of the second optical system, and constraining the product of these two ratios within a reasonable range, it is conducive to controlling the total length of the two optical systems, thereby realizing the miniaturization of the virtual reality device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0019] Figure 1A A schematic plan view of a virtual reality device according to the present application is shown;

[0020] Figure 1Bshows a front view of a virtual reality device according to the present application;

[0021] Figure 1C shows a rear view of a virtual reality device according to the present application;

[0022] Figure 2 A schematic structural diagram of a first optical system according to Embodiment 1 of the present application is shown;

[0023] FIG. 3A to FIG. 3C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system according to the first embodiment of the present application are respectively shown;

[0024] Figure 4 A schematic structural diagram of a first optical system according to Embodiment 2 of the present application is shown;

[0025] FIG. 5A to FIG. 5C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system according to the second embodiment of the present application are respectively shown;

[0026] Figure 6 A schematic structural diagram of a first optical system according to Embodiment 3 of the present application is shown;

[0027] FIG. 7A to FIG. 7C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system according to the third embodiment of the present application are respectively shown;

[0028] Figure 8 A schematic structural diagram of a first optical system according to a fourth embodiment of the present application is shown;

[0029] 9A to 9C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the first optical system according to the fourth embodiment of the present application are respectively shown;

[0030] Fig.10 A schematic structural diagram of a second optical system according to Embodiment 5 of the present application is shown;

[0031] Fig.11A and Fig. 11B The axial chromatic aberration curve and the astigmatism curve of the second optical system according to the fifth embodiment of the present application are respectively shown;

[0032] Fig.12 A schematic structural diagram of a second optical system according to Embodiment 6 of the present application is shown;

[0033] Fig.13A and Fig. 13B The axial chromatic aberration curve and the astigmatism curve of the second optical system according to the sixth embodiment of the present application are respectively shown;

[0034] Fig.14shows a schematic structural diagram of a second optical system according to Embodiment 7 of the present application; and

[0035] Fig.15A and Fig. 15B The axial chromatic aberration curve and the astigmatism curve of the second optical system according to the seventh embodiment of the present application are respectively shown. DETAILED DESCRIPTION

[0036] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

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

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

[0039] In this article, the paraxial area refers to the area near the optical axis. If the surface of the lens and / or the lens is convex and the position of the convex surface is not defined, it means that the surface of the lens and / or the lens is convex at least in the paraxial area; if the surface of the lens and / or the lens is concave and the position of the concave surface is not defined, it means that the surface of the lens and / or the lens is concave at least in the paraxial area. The surface of each lens closest to the first side (such as the human eye side) is called the first side of the lens, and the surface of each lens closest to the second side (such as the display screen side) is called the second side of the lens. The surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.

[0040] It should also be understood that the terms "include", "comprising", "having", "including" 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. In addition, when describing embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0041] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

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

[0044] refer to Figures 1A to 1C In the first aspect of the present application, a virtual reality device is provided, which may include a first optical system and a second optical system. The second optical system is used to image a real scene (such as a picture in the surrounding environment or a user's posture), and the real image is transmitted to a display screen on the second side of the first optical system in the form of an electrical signal. The first optical system is used to project a virtual image of the display screen and the real image transmitted to the display screen. The virtual image here refers to a virtual image of the display screen. By combining the first optical system and the second optical system, virtual reality fusion of the virtual reality device can be achieved. The first optical system may be configured as a catadioptric optical system, and the number thereof may be one or more. The second optical system may be configured as a positioning optical system, and the number thereof may be one or more. In one example, the virtual reality device may include two first optical systems arranged symmetrically. In one example, the virtual reality device may also include a third optical system.

[0045] In an exemplary embodiment, the first optical system may include a first lens, a reflective polarizing element, a quarter wave plate, a second lens, and a third lens arranged in sequence from the first side to the second side along the first optical axis. The second side surface of the third lens may be a convex surface. The first optical system in the present application includes three lenses, a reflective polarizing element, and a quarter wave plate. The polarization state of the light changes after passing through the quarter wave plate. The light after the polarization state changes is reflected or transmitted at the reflective polarizing element, so that the light is refracted between the first lens and the third lens, effectively shortening the main body length of the first optical system. At the same time, the second lens and the third lens are similar to high refractive index and low refractive index cemented lenses, which are conducive to correcting the chromatic aberration of the first optical system.

[0046] In an exemplary embodiment, the first side may be the human eye side, and the second side may be the display screen side. Accordingly, the first side of each element (first lens, second lens, third lens, reflective polarizing element, quarter wave plate) may be referred to as the side near the human eye, and the second side may be referred to as the side near the screen.

[0047] In an exemplary embodiment, the reflective polarizing element is bonded to the quarter wave plate and attached to the second side surface of the first lens. Compared with the quarter wave plate, the reflective polarizing element is closer to the second side surface of the first lens. By combining the reflective polarizing element and the quarter wave plate to form a film layer, the number of attached surfaces of the film layer can be reduced, and the attachment yield of the film layer can be improved.

[0048] As an example, the second side surface of the first lens is configured as a plane, and a film layer formed by laminating a reflective polarizing element and a quarter-wave plate is attached to the second side surface of the first lens. Adopting a planar film laminating method to attach the composite film layer to the plane is conducive to improving the stability of the film layer after attachment, thereby improving the external field performance of the first optical system.

[0049] In an exemplary embodiment, the first optical system may further include a partial reflective layer, which may be attached to the second side surface of the third lens. The partial reflective layer has a semi-transmissive and semi-reflective effect on light. By arranging a partial reflective layer on the second side surface of the third lens and combining a reflective polarizing element and a quarter-wave plate, the light can be refracted multiple times, effectively reducing the main body length of the first optical system.

[0050] In an exemplary embodiment, the first optical system may further include a first aperture, which may be, for example, disposed between the first side and the first lens. The image light on the display screen is refracted and reflected multiple times by the third lens, the second lens, the quarter-wave plate, the reflective polarizing element, the first lens, etc., and is finally projected to the user's eyes.

[0051] In an exemplary embodiment, an image surface may be provided on the second side of the first optical system. The image surface may, for example, be provided with a display screen. The image light from the display screen may sequentially pass through the third lens, the second lens, and the quarter-wave plate to reach the reflective polarizing element located on the second side of the first lens, and then be reflected at the reflective polarizing element to form a first reflected image light. The first reflected image light passes through the quarter-wave plate, the second lens, the third lens and reaches the partial reflective layer located on the second side of the third lens, and then is reflected at the partial reflective layer to form a second reflected image light. The second reflected image light sequentially passes through the third lens, the second lens, the quarter-wave plate, the reflective polarizing element, the first lens to the first aperture and is finally projected into the eyes of the user. The first optical system provided in the present application folds the required optical path without affecting the projection quality by combining light reflection and refraction, thereby effectively shortening the main body length of the first optical system.

[0052] In an exemplary embodiment, the second optical system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in order from the object side to the image side along the second optical axis. An air gap may be provided between adjacent two lenses of the first to eighth lenses.

[0053] In an exemplary embodiment, the first lens may have a negative optical power, and its object side surface may be convex, and the image side surface may be concave. The second lens may have a negative optical power, and its object side surface may be concave, and the image side surface may be concave. The third lens may have a positive optical power, and its object side surface may be convex, and the image side surface may be concave. The fourth lens may have a positive optical power, and its image side surface may be convex. The fifth lens may have a positive optical power, and its object side surface may be convex, and the image side surface may be convex. The sixth lens may have a negative optical power, and its object side surface may be concave. The seventh lens may have a positive optical power, and its object side surface may be convex. The eighth lens may have a positive optical power, and its object side surface may be convex, and the image side surface may be concave. The second optical system in the present application uses eight lenses, and the first two lenses have negative optical power, which is conducive to increasing the field of view angle of the second optical system.

[0054] In an exemplary embodiment, the second optical system may further include a second stop, and the second stop may be disposed between the third lens and the fourth lens.

[0055] In an exemplary embodiment, the axial distance TD' from the first side surface of the first lens to the second side surface of the third lens, the total effective focal length f' of the first optical system, the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens, and the total effective focal length f of the second optical system may satisfy: 4.5<(TD' / f')×(TD / f)<8.6. The virtual reality device provided in the present application is configured as a structural form of a combination of the first optical system and the second optical system. Under the premise that the screen size of the first optical system and the chip size of the second optical system are determined, the focal lengths of the first optical system and the second optical system are basically determined. By controlling the ratio of the axial distance from the first side surface of the first lens to the second side surface of the third lens to the focal length of the first optical system and the ratio of the axial distance from the object side surface of the first lens to the image side surface of the eighth lens to the focal length of the second optical system, and constraining the product of these two ratios within a reasonable range, it is beneficial to control the total length of the two optical systems, thereby realizing the miniaturization of the virtual reality device.

[0056] In an exemplary embodiment, the total effective focal length f' of the first optical system, the entrance pupil diameter EPD' of the first optical system, the total effective focal length f of the second optical system and the entrance pupil diameter EPD of the second optical system may satisfy: 2.4<(f' / EPD') / (f / EPD)<5.2. By controlling the ratio of the total effective focal length of the first optical system to the entrance pupil diameter and the ratio of the total effective focal length of the second optical system to the entrance pupil diameter, and constraining the ratio of these two ratios within a reasonable range, it is beneficial to control the focal lengths of the two optical systems, and make the focal lengths of the two optical systems smaller, thereby increasing the field of view angles of the two optical systems.

[0057] In an exemplary embodiment, the sum of the center thicknesses ΣCT' of each lens from the first lens to the third lens on the first optical axis and the sum of the center thicknesses ΣCT of each lens from the first lens to the eighth lens on the second optical axis may satisfy: 0.7<ΣCT' / ΣCT<2.5. By constraining the ratio of the sum of the center thicknesses of each lens from the first lens to the third lens on the first optical axis to the sum of the center thicknesses of each lens from the first lens to the eighth lens on the second optical axis within a reasonable range, the total lengths of the two optical systems can be made closer, which is beneficial to controlling the uniformity of the virtual reality device.

[0058] In an exemplary embodiment, the maximum field of view FOV' of the first optical system and the maximum field of view FOV of the second optical system can satisfy: 103° < (FOV-FOV') < 119°. By constraining the difference between the maximum field of view of the second optical system and the first optical system within a reasonable range, the second optical system can have a larger field of view, which is conducive to ensuring that the second optical system can capture more scenes or actions in the real world.

[0059] In an exemplary embodiment, the combined focal length f23' of the second lens and the third lens and the combined focal length fz' of the first lens, the reflective polarizing element, and the quarter-wave plate may satisfy: 0.4 < f23' / |fz'| < 1.0. By constraining the ratio of the combined focal length of the second lens and the third lens to the combined focal length of the first lens, the reflective polarizing element, and the quarter-wave plate, the optical power of the first optical system can be reasonably distributed, which is beneficial to controlling the aberration of the first optical system.

[0060] In an exemplary embodiment, the on-axis distance T12' from the second side surface of the first lens to the first side surface of the second lens, the central thickness CTR of the reflective polarizing element on the first optical axis, and the central thickness CTQ of the quarter-wave plate on the first optical axis may satisfy: 2.2 < T12' / (CTR + CTQ) < 3.6. By controlling the ratio of the on-axis distance from the second side surface of the first lens to the first side surface of the second lens to the sum of the central thicknesses of the reflective polarizing element and the quarter-wave plate, the on-axis distance from the second side surface of the first lens to the first side surface of the second lens can be constrained within a reasonable range, which is beneficial to avoiding interference between the quarter-wave plate and the second lens and is also beneficial to the assembly of the first lens and the second lens.

[0061] In an exemplary embodiment, the radius of curvature R1' of the first side surface of the first lens and the radius of curvature R3' of the first side surface of the second lens may satisfy: 0.1 < R1' / R3' < 0.7. By controlling the ratio of the radius of curvature of the first side surface of the first lens to the radius of curvature of the first side surface of the second lens, the first side surface of the first lens can have a smaller radius of curvature, while the second side surface of the second lens can have a larger radius of curvature, which is beneficial to the first lens for converging light, thereby reducing the incident height of light on the second lens and the third lens. At the same time, it is also beneficial to reducing the sensitivity of the first side surface of the second lens and improving the performance yield of the first optical system.

[0062] In an exemplary embodiment, the total effective focal length f' of the first optical system, the effective focal length f2' of the second lens, and the effective focal length f3' of the third lens may satisfy: -0.5 < f' / (f2' + f3') < 0.1. By controlling the ratio of the total effective focal length of the first optical system to the sum of the effective focal lengths of the second lens and the third lens, the optical power of the first optical system can be reasonably distributed, which is beneficial to the rational design of the architecture of the first optical system.

[0063] In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the total effective focal length f of the second optical system may satisfy: -7.7 < (f1 + f2) / f < -6.5. By controlling the ratio of the sum of the effective focal lengths of the first lens and the second lens to the total effective focal length of the second optical system, the focal lengths of the first lens and the second lens can be made to be relatively large negative values, enabling the second optical system to satisfy the wide-angle characteristic, which is conducive to increasing the field angle of the second optical system.

[0064] In an exemplary embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens may satisfy: 0.5 < f3 / (f4 + f5) < 0.9. By controlling the ratio of the effective focal length of the third lens to the sum of the effective focal lengths of the fourth lens and the fifth lens, the focal lengths of the third lens, the fourth lens, and the fifth lens can all be positive values. When paired with the two front negative lenses, it is conducive to reducing the monochromatic aberration of the second optical system, and the symmetry of the third lens and the fourth lens is conducive to reducing the lateral aberration of the second optical system.

[0065] In an exemplary embodiment, the effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the effective focal length f7 of the seventh lens, and the curvature radius R13 of the object side surface of the seventh lens may satisfy: 1.6 < (f6 / R11)×(f7 / R13) < 3.4. By controlling the ratio of the effective focal length of the sixth lens to the curvature radius of the object side surface of the sixth lens and the ratio of the effective focal length of the seventh lens to the curvature radius of the object side surface of the seventh lens, and restricting the product of these two ratios within a reasonable range, it is conducive to controlling the shapes of the sixth lens and the seventh lens, thereby facilitating the molding of the sixth lens and the seventh lens.

[0066] In an exemplary embodiment, the effective focal length f8 of the eighth lens and the central thickness CT8 of the eighth lens on the second optical axis may satisfy: 4.2 < f8 / CT8 < 5.0. By controlling the ratio of the effective focal length of the eighth lens to the central thickness, the curvatures of the object side surface and the image side surface of the eighth lens can be indirectly restricted, and the curvatures of the object side surface and the image side surface of the eighth lens are approximately the same, which is conducive to reducing the sensitivity of the eighth lens and improving the assembly yield of the second optical system.

[0067] In an exemplary embodiment, the center thickness CT2 of the second lens on the second optical axis, the center thickness CT3 of the third lens on the second optical axis, the center thickness CT4 of the fourth lens on the second optical axis, and the center thickness CT5 of the fifth lens on the second optical axis may satisfy: 2.6<(CT4+CT5) / (CT2+CT3)<3.0. By controlling the ratio of the sum of the center thicknesses of the fourth lens and the fifth lens to the sum of the center thicknesses of the second lens and the third lens, the fourth lens and the fifth lens may have a larger center thickness, and the fourth lens and the fifth lens may diverge the light passing through the second aperture, thereby facilitating matching with the chip of the second optical system.

[0068] The virtual reality device according to the above embodiment of the present application may include a first optical system and a second optical system, wherein the first optical system may use multiple lenses, such as the three lenses described above, and the second optical system may use multiple lenses, such as the eight lenses described above. By reasonably configuring the parameters of the first optical system and the second optical system, the imaging quality and visual immersion of the virtual reality device can be improved. And the virtual reality device with the above configuration has the characteristics of miniaturization and good imaging quality, which can well meet the use requirements of various portable electronic products in projection scenes.

[0069] In an embodiment of the present application, at least one of the surfaces of each lens in the first lens to the third lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Similarly, at least one of the surfaces of each lens in the first lens to the eighth lens is an aspherical surface.

[0070] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of constituent lenses and / or mirrors may be changed to obtain the various results and advantages described in this specification.

[0071] refer to Figures 1A to 1CAccording to a second aspect of the present application, a virtual reality device may include a first optical system and a second optical system; the first optical system includes a first lens, a reflective polarizing element, a quarter wave plate, a second lens and a third lens arranged in sequence from the first side to the second side along the first optical axis, and the second side surface of the third lens may be a convex surface; the second optical system includes in sequence from the object side to the image side along the second optical axis: a first lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens with negative optical power, whose object side surface is concave and whose image side surface is concave; a third lens with positive optical power, whose object side surface is convex and whose image side surface is concave; a fourth lens with positive optical power, whose image side surface is convex; a fifth lens with positive optical power, whose object side surface is convex and whose image side surface is convex; a sixth lens with negative optical power, whose object side surface is concave; a seventh lens with positive optical power, whose object side surface is convex; and an eighth lens with positive optical power, whose object side surface is convex and whose image side surface is concave.

[0072] Among them, the total effective focal length f' of the first optical system, the entrance pupil diameter EPD' of the first optical system, the total effective focal length f of the second optical system and the entrance pupil diameter EPD of the second optical system can satisfy: 2.4<(f' / EPD') / (f / EPD)<5.2. The virtual reality device provided in the present application is configured as a structural form of a combination of a first optical system and a second optical system. The first optical system includes three lenses, a reflective polarizing element and a quarter-wave plate. The polarization state of light changes after passing through the quarter-wave plate. The light with the changed polarization state is reflected or transmitted at the reflective polarizing element, so that the light is refracted between the first lens and the third lens, effectively shortening the main body length of the first optical system. At the same time, the second lens and the third lens are similar to high-refractive index and low-refractive index cemented lenses, which are conducive to correcting the chromatic aberration of the first optical system; the second optical system uses eight lenses, and the first two lenses have negative optical focal length, which is conducive to increasing the field of view of the second optical system. In addition, by controlling the ratio of the total effective focal length of the first optical system to the entrance pupil diameter and the ratio of the total effective focal length of the second optical system to the entrance pupil diameter, and constraining the ratio of these two ratios within a reasonable range, it is beneficial to control the focal lengths of the two optical systems and make the focal lengths of the two optical systems smaller, thereby increasing the field of view angles of the two optical systems.

[0073] Specific embodiments of the first optical system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0074] Embodiment 1

[0075] The following reference Figures 2 to 3C The first optical system according to the first embodiment of the present application is described.

[0076] like Figure 2As shown, the first optical system 100 includes a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2' and a third lens E3' arranged in sequence from the first side to the second side along the first optical axis. The first aperture STO1 may be arranged between the first side and the first lens E1'. The second side of the third lens E3' may also be provided with a partial reflective layer BS. In this embodiment, the first side refers to the human eye side, and the second side refers to the display screen side. The first side of each element (the first lens E1', the reflective polarizing element RP, the quarter wave plate QWP, the second lens E2', the third lens E3') is referred to as the side near the human eye, and the second side is referred to as the side near the screen.

[0077] The first lens E1' has positive focal power, and its side surface S1 near the human eye is convex, and its side surface S2 near the screen is flat. The reflective polarizing element RP has a side surface near the human eye and a side surface near the screen, and the side surface near the human eye of the reflective polarizing element RP is attached to the side surface S2 near the screen of the first lens E1'. The quarter-wave plate QWP has a side surface near the human eye and a side surface near the screen, and its side surface near the human eye is attached to the side surface near the screen of the reflective polarizing element RP. The second lens E2' has positive focal power, and its side surface S3 near the human eye is convex, and its side surface S4 near the screen is convex. The third lens E3' has positive focal power, and its side surface S5 near the human eye is concave, and its side surface S6 near the screen is convex. The partial reflection layer BS can be attached to the side surface S6 near the screen of the third lens E3'.

[0078] The second side of the first optical system 100 may be provided with an image surface IMG, and the image surface IMG may be provided with a display screen. The image light from the image surface IMG passes through the third lens E3', the second lens E2', the quarter-wave plate QWP in sequence and reaches the reflective polarizer RP located on the near-screen side S2 of the first lens E1', and then undergoes a first reflection at the reflective polarizer RP. The light reflected for the first time passes through the quarter-wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflective layer BS located on the near-screen side S6 of the third lens E3', and then undergoes a second reflection at the partial reflective layer BS. The light reflected for the second time passes through the third lens E3', the second lens E2', the quarter-wave plate QWP, the reflective polarizer RP, the first lens E1' to the first aperture STO1 in sequence and is finally projected into the eyes of the user. For example, the light of the first optical system 100 after two reflections is finally projected into the eyes of the user.

[0079] Table 1 shows the basic parameters of the first optical system of the first embodiment, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). The image light from the image plane IMG passes through the components in the order of sequence number 19 to sequence number 1 and is finally projected into the human eye.

[0080]

[0081] Table 1

[0082] In this embodiment, the total effective focal length f' of the first optical system is 28.26 mm, the combined focal length fz' of the first lens, the reflective polarizing element and the quarter-wave plate is 172.57 mm, the combined focal length f23' of the second lens and the third lens is 109.59 mm, the effective focal length f2' of the second lens is 170.50 mm, the effective focal length f3' of the third lens is 292.23 mm, the maximum field of view FOV' of the first optical system is 96.00°, and the entrance pupil diameter EPD' of the first optical system is 5.00 mm.

[0083] In this embodiment, the side surface S1 near the human eye of the first lens E1', the side surface S3 near the human eye and the side surface S4 near the screen of the second lens E2', and the side surface S5 near the human eye and the side surface S6 near the screen of the third lens E3' are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0084]

[0085] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0086] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S1 1.7237E+00 -1.0531E-02 1.8280E-02 1.1790E-02 1.9481E-03 -2.2963E-03 4.9674E-04 0.0000E+00 0.0000E+00 S3 -1.7897E-01 -4.5955E-02 3.6542E-02 -2.4898E-03 -5.2026E-03 4.4163E-03 -1.1827E-03 0.0000E+00 0.0000E+00 S4 -2.0077E-01 -2.0784E-01 -3.5027E-02 3.7970E-03 1.8428E-02 1.3874E-02 -7.2088E-04 0.0000E+00 0.0000E+00 S5 -1.7781E+00 -4.2544E-01 -1.1943E-01 -2.8744E-02 5.6071E-03 9.3229E-03 1.8844E-03 0.0000E+00 0.0000E+00 S6 -1.0784E-01 -6.9805E-02 -8.2343E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0087] Table 2

[0088] Figure 3A The axial chromatic aberration curve of the first optical system 100 of the first embodiment is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the first optical system. Figure 3B The astigmatism curve of the first optical system 100 of the first embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 3C The distortion curve of the first optical system 100 of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 3A to FIG. 3CIt can be seen that the first optical system 100 provided in the first embodiment can achieve good imaging quality.

[0089] Embodiment 2

[0090] The following reference Figures 4 to 5C The first optical system according to the second embodiment of the present application is described.

[0091] like Figure 4 As shown, the first optical system 100 includes a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2' and a third lens E3' arranged in sequence from the first side to the second side along the first optical axis. The first aperture STO1 may be arranged between the first side and the first lens E1'. The second side of the third lens E3' may also be provided with a partial reflective layer BS. In this embodiment, the first side refers to the human eye side, and the second side refers to the display screen side. The first side of each element (the first lens E1', the reflective polarizing element RP, the quarter wave plate QWP, the second lens E2', the third lens E3') is referred to as the side near the human eye, and the second side is referred to as the side near the screen.

[0092] The first lens E1' has positive focal power, and its side surface S1 near the human eye is convex, and its side surface S2 near the screen is flat. The reflective polarizing element RP has a side surface near the human eye and a side surface near the screen, and the side surface near the human eye of the reflective polarizing element RP is attached to the side surface S2 near the screen of the first lens E1'. The quarter-wave plate QWP has a side surface near the human eye and a side surface near the screen, and its side surface near the human eye is attached to the side surface near the screen of the reflective polarizing element RP. The second lens E2' has negative focal power, and its side surface S3 near the human eye is convex, and its side surface S4 near the screen is concave. The third lens E3' has positive focal power, and its side surface S5 near the human eye is convex, and its side surface S6 near the screen is convex. The partial reflection layer BS can be attached to the side surface S6 near the screen of the third lens E3'.

[0093] The second side of the first optical system 100 may be provided with an image surface IMG, and the image surface IMG may be provided with a display screen. The image light from the image surface IMG passes through the third lens E3', the second lens E2', the quarter-wave plate QWP in sequence and reaches the reflective polarizer RP located on the near-screen side S2 of the first lens E1', and then undergoes a first reflection at the reflective polarizer RP. The light reflected for the first time passes through the quarter-wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflective layer BS located on the near-screen side S6 of the third lens E3', and then undergoes a second reflection at the partial reflective layer BS. The light reflected for the second time passes through the third lens E3', the second lens E2', the quarter-wave plate QWP, the reflective polarizer RP, the first lens E1' to the first aperture STO1 in sequence and is finally projected into the eyes of the user. For example, the light of the first optical system 100 after two reflections is finally projected into the eyes of the user.

[0094] Table 3 shows the basic parameters of the first optical system of the second embodiment, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). The image light from the image plane IMG passes through the components in the order of sequence number 19 to sequence number 1 and is finally projected into the human eye.

[0095]

[0096] Table 3

[0097] In this embodiment, the total effective focal length f' of the first optical system is 15.66 mm, the combined focal length fz' of the first lens, the reflective polarizing element and the quarter-wave plate is 113.80 mm, the combined focal length f23' of the second lens and the third lens is 109.20 mm, the effective focal length f2' of the second lens is -82.65 mm, the effective focal length f3' of the third lens is 48.66 mm, the maximum field of view FOV' of the first optical system is 96.00°, and the entrance pupil diameter EPD' of the first optical system is 5.00 mm.

[0098] In this embodiment, the side surface S1 near the human eye of the first lens E1', the side surface S3 near the human eye and the side surface S4 near the screen of the second lens E2', and the side surface S5 near the human eye and the side surface S6 near the screen of the third lens E3' are all aspherical surfaces. Table 4 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A64, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0099] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S1 -6.1153E-01 -3.3166E-01 8.0580E-03 -1.1441E-02 -2.5244E-03 8.2930E-03 1.6853E-03 0.0000E+00 0.0000E+00 S3 -6.0641E-01 2.6268E-01 -7.4653E-02 8.7985E-02 -2.9213E-02 1.9815E-03 -7.5513E-04 0.0000E+00 0.0000E+00 S4 -1.0827E+00 -2.2629E-01 -5.0583E-02 5.2634E-02 -2.9721E-02 1.0318E-02 5.9363E-04 0.0000E+00 0.0000E+00 S5 -1.6093E+00 -1.2201E-01 1.8394E-02 -3.2984E-02 1.2357E-02 -1.0253E-02 1.6463E-03 0.0000E+00 0.0000E+00 S6 4.2211E-03 -1.3171E-02 -1.4171E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0100] Table 4

[0101] Figure 5A The axial chromatic aberration curve of the first optical system 100 of the second embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the first optical system. Figure 5B The astigmatism curve of the first optical system 100 of the second embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 5C The distortion curve of the first optical system 100 of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 5A to FIG. 5C It can be seen that the first optical system 100 provided in the second embodiment can achieve good imaging quality.

[0102] Embodiment 3

[0103] The following reference Figures 6 to 7C The first optical system according to the third embodiment of the present application is described.

[0104] like Figure 6 As shown, the first optical system 100 includes a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2' and a third lens E3' arranged in sequence from the first side to the second side along the first optical axis. The first aperture STO1 may be arranged between the first side and the first lens E1'. The second side of the third lens E3' may also be provided with a partial reflective layer BS. In this embodiment, the first side refers to the human eye side, and the second side refers to the display screen side. The first side of each element (the first lens E1', the reflective polarizing element RP, the quarter wave plate QWP, the second lens E2', the third lens E3') is referred to as the side near the human eye, and the second side is referred to as the side near the screen.

[0105] The first lens E1' has positive focal power, and its side surface S1 near the human eye is convex, and its side surface S2 near the screen is flat. The reflective polarizing element RP has a side surface near the human eye and a side surface near the screen, and the side surface near the human eye of the reflective polarizing element RP is attached to the side surface S2 near the screen of the first lens E1'. The quarter-wave plate QWP has a side surface near the human eye and a side surface near the screen, and its side surface near the human eye is attached to the side surface near the screen of the reflective polarizing element RP. The second lens E2' has positive focal power, and its side surface S3 near the human eye is convex, and its side surface S4 near the screen is concave. The third lens E3' has positive focal power, and its side surface S5 near the human eye is convex, and its side surface S6 near the screen is convex. The partial reflection layer BS can be attached to the side surface S6 near the screen of the third lens E3'.

[0106] The second side of the first optical system 100 may be provided with an image surface IMG, and the image surface IMG may be provided with a display screen. The image light from the image surface IMG passes through the third lens E3', the second lens E2', the quarter-wave plate QWP in sequence and reaches the reflective polarizer RP located on the near-screen side S2 of the first lens E1', and then undergoes a first reflection at the reflective polarizer RP. The light reflected for the first time passes through the quarter-wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflective layer BS located on the near-screen side S6 of the third lens E3', and then undergoes a second reflection at the partial reflective layer BS. The light reflected for the second time passes through the third lens E3', the second lens E2', the quarter-wave plate QWP, the reflective polarizer RP, the first lens E1' to the first aperture STO1 in sequence and is finally projected into the eyes of the user. For example, the light of the first optical system 100 after two reflections is finally projected into the eyes of the user.

[0107] Table 5 shows the basic parameters of the first optical system of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). The image light from the image plane IMG passes through the components in the order of sequence number 19 to sequence number 1 and is finally projected into the human eye.

[0108]

[0109]

[0110] Table 5

[0111] In this embodiment, the total effective focal length f' of the first optical system is 15.99 mm, the combined focal length fz' of the first lens, the reflective polarizing element and the quarter-wave plate is 121.98 mm, the combined focal length f23' of the second lens and the third lens is 77.77 mm, the effective focal length f2' of the second lens is 3289.20 mm, the effective focal length f3' of the third lens is 79.22 mm, the maximum field of view FOV' of the first optical system is 96.00°, and the entrance pupil diameter EPD' of the first optical system is 5.00 mm.

[0112] In this embodiment, the side surface S1 near the human eye of the first lens E1', the side surface S3 near the human eye and the side surface S4 near the screen of the second lens E2', and the side surface S5 near the human eye and the side surface S6 near the screen of the third lens E3' are all aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A 10 , A 12 , A 14 , A 16 , A 18 and A20 .

[0113] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S1 -7.7832E-02 -8.0278E-02 -4.4280E-02 1.4286E-02 -4.7680E-03 -5.9445E-04 -3.2749E-04 0.0000E+00 0.0000E+00 S3 -5.2647E-01 1.7378E-02 1.4687E-03 -5.6363E-04 -5.7278E-03 -2.4342E-03 4.0963E-04 0.0000E+00 0.0000E+00 S4 -2.6318E-01 1.4742E-01 -2.4382E-01 4.3098E-02 -4.1613E-03 -1.4102E-02 3.0397E-03 0.0000E+00 0.0000E+00 S5 -6.2284E-01 1.6363E-01 -1.1425E-01 1.3515E-02 6.2756E-03 -5.2626E-03 1.3959E-03 0.0000E+00 0.0000E+00 S6 6.3214E-03 -1.1485E-02 -1.2245E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0114] Table 6

[0115] Fig. 7A The axial chromatic aberration curve of the first optical system 100 of the third embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the first optical system. Figure 7B The astigmatism curve of the first optical system 100 of the third embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Figure 7C The distortion curve of the first optical system 100 of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. FIG. 7A to FIG. 7C It can be seen that the first optical system 100 provided in the third embodiment can achieve good imaging quality.

[0116] Embodiment 4

[0117] The following reference Figures 8 to 9C Describe the first optical system according to the fourth embodiment of the present application.

[0118] like Figure 8 As shown, the first optical system 100 includes a first lens E1', a reflective polarizing element RP, a quarter wave plate QWP, a second lens E2' and a third lens E3' arranged in sequence from the first side to the second side along the first optical axis. The first aperture STO1 may be arranged between the first side and the first lens E1'. The second side of the third lens E3' may also be provided with a partial reflective layer BS. In this embodiment, the first side refers to the human eye side, and the second side refers to the display screen side. The first side of each element (the first lens E1', the reflective polarizing element RP, the quarter wave plate QWP, the second lens E2', the third lens E3') is referred to as the side near the human eye, and the second side is referred to as the side near the screen.

[0119] The first lens E1' has negative focal power, and its side surface S1 near the human eye is concave, and its side surface S2 near the screen is convex. The reflective polarizing element RP has a side surface near the human eye and a side surface near the screen, and the side surface near the human eye of the reflective polarizing element RP is attached to the side surface S2 near the screen of the first lens E1'. The quarter-wave plate QWP has a side surface near the human eye and a side surface near the screen, and its side surface near the human eye is attached to the side surface near the screen of the reflective polarizing element RP. The second lens E2' has positive focal power, and its side surface S3 near the human eye is concave, and its side surface S4 near the screen is convex. The third lens E3' has negative focal power, and its side surface S5 near the human eye is concave, and its side surface S6 near the screen is convex. The partial reflection layer BS can be attached to the side surface S6 near the screen of the third lens E3'.

[0120] The second side of the first optical system 100 may be provided with an image surface IMG, and the image surface IMG may be provided with a display screen. The image light from the image surface IMG passes through the third lens E3', the second lens E2', the quarter-wave plate QWP in sequence and reaches the reflective polarizer RP located on the near-screen side S2 of the first lens E1', and then undergoes a first reflection at the reflective polarizer RP. The light reflected for the first time passes through the quarter-wave plate QWP, the second lens E2', the third lens E3' and reaches the partial reflective layer BS located on the near-screen side S6 of the third lens E3', and then undergoes a second reflection at the partial reflective layer BS. The light reflected for the second time passes through the third lens E3', the second lens E2', the quarter-wave plate QWP, the reflective polarizer RP, the first lens E1' to the first aperture STO1 in sequence and is finally projected into the eyes of the user. For example, the light of the first optical system 100 after two reflections is finally projected into the eyes of the user.

[0121] Table 7 shows the basic parameters of the first optical system of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm). The image light from the image plane IMG passes through the components in the order of sequence number 19 to sequence number 1 and is finally projected into the human eye.

[0122]

[0123] Table 7

[0124] In this embodiment, the total effective focal length f' of the first optical system is 14.39 mm, the combined focal length fz' of the first lens, the reflective polarizing element and the quarter-wave plate is -228.45 mm, the combined focal length f23' of the second lens and the third lens is 109.38 mm, the effective focal length f2' of the second lens is 56.52 mm, the effective focal length f3' of the third lens is -139.15 mm, the maximum field of view FOV' of the first optical system is 96.00°, and the entrance pupil diameter EPD' of the first optical system is 5.00 mm.

[0125] In this embodiment, the side surface S1 near the human eye and the side surface S2 near the screen of the first lens E1', the side surface S3 near the human eye and the side surface S4 near the screen of the second lens E2', and the side surface S5 near the human eye and the side surface S6 near the screen of the third lens E3' are all aspherical surfaces. Table 8 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0126] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S1 -1.1242E-01 2.1702E-02 1.8514E-01 -2.8267E-03 1.3801E-02 -1.4578E-02 3.2945E-03 0.0000E+00 0.0000E+00 S2 -5.2829E-02 1.0902E-01 3.1306E-02 6.8431E-03 1.6485E-03 6.1464E-04 -9.2957E-04 0.0000E+00 0.0000E+00 S3 -1.5098E+00 3.4975E-01 -2.2104E-01 4.1582E-02 -5.3277E-02 1.1293E-02 -9.2157E-03 0.0000E+00 0.0000E+00 S4 -3.9932E-01 -3.5499E-02 7.9833E-02 1.7820E-02 3.6225E-02 -4.3785E-03 1.6630E-03 0.0000E+00 0.0000E+00 S5 1.1224E+00 -1.0458E-01 6.5785E-02 -1.9573E-02 2.5698E-02 -3.9078E-03 3.1698E-03 0.0000E+00 0.0000E+00 S6 9.3449E-03 -1.3907E-03 -1.2398E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0127] Table 8

[0128] Fig.9A The axial chromatic aberration curve of the first optical system 100 of the fourth embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the first optical system. Fig. 9B The astigmatism curve of the first optical system 100 of the fourth embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different field angles. Fig. 9C The distortion curve of the first optical system 100 of the fourth embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. 9A to 9C It can be seen that the first optical system 100 provided in the fourth embodiment can achieve good imaging quality.

[0129] Specific embodiments of the second optical system applicable to the above-mentioned embodiment will be further described below with reference to the accompanying drawings.

[0130] Embodiment 5

[0131] The following reference Figures 10 to 11B The second optical system according to the fifth embodiment of the present application is described.

[0132] like Fig.10 As shown, the second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and an eighth lens E8 arranged in sequence from the object side to the image side along the second optical axis. The second aperture STO2 can be disposed between the third lens E3 and the fourth lens E4.

[0133] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0134] Table 9 shows the basic parameters of the second optical system of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0135]

[0136]

[0137] Table 9

[0138] In this embodiment, the total effective focal length f of the second optical system is 1.35 mm, the maximum field of view FOV of the second optical system is 214.00°, and the entrance pupil diameter EPD of the second optical system is 1.23 mm.

[0139] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the eighth lens E8 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0140]

[0141] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 9 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 10 lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0142]

[0143]

[0144] Table 10

[0145] Fig.11A The axial chromatic aberration curve of the second optical system 200 of the fifth embodiment is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the second optical system. Fig. 11B The astigmatism curve of the second optical system 200 of the fifth embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.11Aand Fig. 11B It can be seen that the second optical system 200 provided in the fifth embodiment can achieve good imaging quality.

[0146] Embodiment 6

[0147] The following reference Figures 12 to 13B The second optical system according to the sixth embodiment of the present application is described.

[0148] like Fig.12 As shown, the second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and an eighth lens E8 arranged in sequence from the object side to the image side along the second optical axis. The second aperture STO2 can be disposed between the third lens E3 and the fourth lens E4.

[0149] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0150] Table 11 shows the basic parameters of the second optical system of Example 6, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0151]

[0152]

[0153] Table 11

[0154] In this embodiment, the total effective focal length f of the second optical system is 1.34 mm, the maximum field of view FOV of the second optical system is 202.00°, and the entrance pupil diameter EPD of the second optical system is 1.16 mm.

[0155] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the eighth lens E8 are aspherical surfaces. Table 12 lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0156] Face number A4 A6 A8 A10 A12 A14 A16 S3 1.9987E-02 -1.6848E-02 1.1134E-02 -2.2323E-03 -2.4485E-03 2.4963E-03 -1.1952E-03 S4 -5.0110E-02 6.2263E-01 -3.6739E+00 1.3123E+01 -3.1226E+01 5.1782E+01 -6.1288E+01 S5 2.3432E-02 5.8218E-02 -5.4002E-01 2.7098E+00 -8.3554E+00 1.7106E+01 -2.4144E+01 S6 5.2119E-02 -1.5136E-01 1.6432E+00 -9.8676E+00 3.8576E+01 -1.0325E+02 1.9520E+02 S7 1.2812E-02 -1.3419E-01 6.1118E-01 -1.7113E+00 3.1608E+00 -3.9713E+00 3.4317E+00 S8 -6.2137E-03 3.2400E-02 -8.7964E-02 1.6088E-01 -1.9338E-01 1.5572E-01 -8.4430E-02 S9 -1.5919E-02 2.9486E-02 -5.9112E-02 8.4854E-02 -8.4951E-02 6.0790E-02 -3.1632E-02 S10 -4.0138E-02 -5.6636E-02 3.1177E-01 -5.7356E-01 5.9120E-01 -3.8443E-01 1.6582E-01 S11 3.2474E-02 4.0008E-02 1.0180E-01 -3.7124E-01 4.8048E-01 -3.5872E-01 1.7516E-01 S12 3.7724E-03 -6.2199E-03 1.7303E-01 -3.6198E-01 3.9588E-01 -2.8029E-01 1.3856E-01 S13 8.1641E-03 -1.6852E-01 3.5812E-01 -4.4539E-01 3.7008E-01 -2.1728E-01 9.2866E-02 S14 1.6613E-01 -5.5545E-01 7.9649E-01 -7.3807E-01 4.8203E-01 -2.2864E-01 7.9778E-02 S15 1.2515E-01 -3.9724E-01 5.3906E-01 -4.8697E-01 3.0946E-01 -1.4157E-01 4.7324E-02 S16 6.9940E-02 -6.1026E-02 8.4757E-03 1.0427E-02 -6.4209E-03 1.2153E-03 2.8799E-04 Face number A18 A20 A22 A24 A26 A28 A30 S3 3.6438E-04 -7.6028E-05 1.1042E-05 -1.1013E-06 7.2059E-08 -2.7880E-09 4.8359E-11 S4 5.2394E+01 -3.2403E+01 1.4352E+01 -4.4360E+00 9.0824E-01 -1.1064E-01 6.0673E-03 S5 2.4007E+01 -1.6962E+01 8.4714E+00 -2.9238E+00 6.6340E-01 -8.9016E-02 5.3500E-03 S6 -2.6495E+02 2.5927E+02 -1.8136E+02 8.8471E+01 -2.8592E+01 5.5027E+00 -4.7751E-01 S7 -2.0246E+00 7.9262E-01 -1.9370E-01 2.6010E-02 -1.3839E-03 0.0000E+00 0.0000E+00 S8 3.0389E-02 -6.9552E-03 9.1579E-04 -5.2800E-05 0.0000E+00 0.0000E+00 0.0000E+00 S9 1.2062E-02 -3.3657E-03 6.7866E-04 -9.6185E-05 9.0828E-06 -5.1279E-07 1.3088E-08 S10 -4.8185E-02 9.2546E-03 -1.0806E-03 5.3441E-05 3.2352E-06 -5.9128E-07 2.4221E-08 S11 -5.8969E-02 1.3982E-02 -2.3347E-03 2.6874E-04 -2.0255E-05 8.9524E-07 -1.7428E-08 S12 -4.9358E-02 1.2784E-02 -2.3894E-03 3.1422E-04 -2.7592E-05 1.4527E-06 -3.4689E-08 S13 -2.9266E-02 6.8005E-03 -1.1509E-03 1.3791E-04 -1.1088E-05 5.3648E-07 -1.1806E-08 S14 -2.0534E-02 3.8756E-03 -5.2802E-04 5.0377E-05 -3.1831E-06 1.1922E-07 -1.9951E-09 S15 -1.1639E-02 2.1014E-03 -2.7495E-04 2.5353E-05 -1.5613E-06 5.7619E-08 -9.6345E-10 S16 -2.3465E-04 6.8461E-05 -1.1848E-05 1.3129E-06 -9.1891E-08 3.7173E-09 -6.6421E-11

[0157] Table 12

[0158] Fig.13A The axial chromatic aberration curve of the second optical system 200 of the sixth embodiment is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the second optical system. Fig. 13B The astigmatism curve of the second optical system 200 of the sixth embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.13A and Fig. 13B It can be seen that the second optical system 200 provided in the sixth embodiment can achieve good imaging quality.

[0159] Embodiment 7

[0160] The following reference Figures 14 to 15B The second optical system according to the seventh embodiment of the present application is described.

[0161] like Fig.14 As shown, the second optical system 200 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7 and an eighth lens E8 arranged in sequence from the object side to the image side along the second optical axis. The second aperture STO2 can be disposed between the third lens E3 and the fourth lens E4.

[0162] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0163] Table 13 shows the basic parameters of the second optical system of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0164]

[0165] Table 13

[0166] In this embodiment, the total effective focal length f of the second optical system is 1.41 mm, the maximum field of view FOV of the second optical system is 200.00°, and the entrance pupil diameter EPD of the second optical system is 1.23 mm.

[0167] In this embodiment, the object side surface and the image side surface of any one of the second lens E2 to the eighth lens E8 are aspherical surfaces. Table 14 lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0168]

[0169]

[0170] Table 14

[0171] Fig.15AThe axial chromatic aberration curve of the second optical system 200 of the seventh embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the second optical system. Fig. 15B The astigmatism curve of the second optical system 200 of the seventh embodiment is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.15A and Fig. 15B It can be seen that the second optical system 200 provided in the seventh embodiment can achieve good imaging quality.

[0172] refer to Figures 1A to 1C The virtual reality device 10 provided in the present application may include the first optical system 100 in any of the above embodiments and the second optical system 200 in any of the above embodiments. The first optical system and the second optical system are combined in pairs to form 12 virtual reality devices, that is, the virtual reality device has 12 examples. Among them,

[0173] Example 1: The virtual reality device includes the first optical system of Example 1 and the second optical system of Example 5;

[0174] Example 2: The virtual reality device includes the first optical system of Example 1 and the second optical system of Example 6;

[0175] Example 3: The virtual reality device includes the first optical system of embodiment 1 and the second optical system of embodiment 7;

[0176] Example 4: The virtual reality device includes the first optical system of Example 2 and the second optical system of Example 5;

[0177] Example 5: The virtual reality device includes the first optical system of Example 2 and the second optical system of Example 6;

[0178] Example 6: The virtual reality device includes the first optical system of Example 2 and the second optical system of Example 7;

[0179] Example 7: The virtual reality device includes the first optical system of Example 3 and the second optical system of Example 5;

[0180] Example 8: The virtual reality device includes the first optical system of Example 3 and the second optical system of Example 6;

[0181] Example 9: The virtual reality device includes the first optical system of Example 3 and the second optical system of Example 7;

[0182] Example 10: The virtual reality device includes the first optical system of Example 4 and the second optical system of Example 5;

[0183] Example 11: The virtual reality device includes the first optical system of Example 4 and the second optical system of Example 6;

[0184] Example 12: The virtual reality device includes the first optical system of Example 4 and the second optical system of Example 7.

[0185] It should be understood that if Figure 1A As shown, the virtual reality device 10 provided in the present application may further include a third optical system 300 , and the structure of the third optical system 300 may be different from the structures of the first optical system 100 and the second optical system 200 .

[0186] In summary, Table 15 shows the values ​​of the conditional expressions of each of Examples 1 to 12.

[0187] Conditional / Example 1 2 3 4 5 6 (TD' / f')×(TD / f) 5.81 6.24 7.40 6.61 7.10 8.42 (f' / EPD') / (f / EPD) 5.13 4.91 4.91 2.84 2.72 2.72 ∑CT' / ∑CT 2.49 2.38 1.77 1.75 1.68 1.24 f23' / |fz'| 0.64 0.64 0.64 0.96 0.96 0.96 T12' / (CTR+CTQ) 3.50 3.50 3.50 2.59 2.59 2.59 R1' / R3' 0.54 0.54 0.54 0.13 0.13 0.13 FOV-FOV' 118.00 106.00 104.00 118.00 106.00 104.00 (f1+f2) / f -7.62 -6.61 -6.52 -7.62 -6.61 -6.52 f3 / (f4+f5) 0.59 0.68 0.78 0.59 0.68 0.78 (f6 / R11)×(f7 / R13) 1.68 3.30 3.13 1.68 3.30 3.13 f8 / CT8 4.37 4.46 4.92 4.37 4.46 4.92 f' / (f2'+f3') 0.061 0.061 0.061 -0.461 -0.461 -0.461 (CT4+CT5) / (CT2+CT3) 2.84 2.79 2.88 2.84 2.79 2.88 Conditional / Example 7 8 9 10 11 12 (TD' / f')×(TD / f) 6.68 7.17 8.51 4.52 4.85 5.76 (f' / EPD') / (f / EPD) 2.90 2.78 2.78 2.61 2.50 2.50 ∑CT' / ∑CT 1.78 1.71 1.26 1.07 1.02 0.76 f23' / |fz'| 0.64 0.64 0.64 0.48 0.48 0.48 T12' / (CTR+CTQ) 3.50 3.50 3.50 2.25 2.25 2.25 R1' / R3' 0.40 0.40 0.40 0.60 0.60 0.60 FOV-FOV' 118.00 106.00 104.00 118.00 106.00 104.00 (f1+f2) / f -7.62 -6.61 -6.52 -7.62 -6.61 -6.52 f3 / (f4+f5) 0.59 0.68 0.78 0.59 0.68 0.78 (f6 / R11)×(f7 / R13) 1.68 3.30 3.13 1.68 3.30 3.13 f8 / CT8 4.37 4.46 4.92 4.37 4.46 4.92 f' / (f2'+f3') 0.005 0.005 0.005 -0.174 -0.174 -0.174 (CT4+CT5) / (CT2+CT3) 2.84 2.79 2.88 2.84 2.79 2.88

[0188] Table 15

[0189] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other.

Claims

1. A virtual reality device, comprising a first optical system and a second optical system, characterized in that: The first optical system includes a first lens, a reflective polarizing element, a quarter wave plate, a second lens and a third lens in sequence from the first side to the second side along the first optical axis, and the second side surface of the third lens is a convex surface; The second optical system includes, in order from the object side to the image side along the second optical axis: A first lens having negative optical power, wherein the object side surface is convex and the image side surface is concave; A second lens element with negative optical power, whose object side surface is concave and image side surface is concave; A third lens element having positive power, whose object side surface is convex and image side surface is concave; a fourth lens element having positive power, the image side surface of which is convex; A fifth lens element having positive power, whose object side surface is convex and whose image side surface is convex; a sixth lens element having negative optical power, the object side surface of which is concave; a seventh lens element having positive power, the object side surface of which is convex; and An eighth lens element having positive power, whose object side surface is convex and whose image side surface is concave; Among them, the real image formed by the second optical system is transmitted to the display screen on the second side of the first optical system in the form of an electrical signal, and the first optical system is used to project the virtual image of the display screen and the real image transmitted to the display screen; the axial distance TD' from the first side surface of the first lens to the second side surface of the third lens, the total effective focal length f' of the first optical system, the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens and the total effective focal length f of the second optical system satisfy: 4.5<(TD' / f')×(TD / f)<8.

6.

2. The virtual reality device according to claim 1, characterized in that: The total effective focal length f' of the first optical system, the entrance pupil diameter EPD' of the first optical system, the total effective focal length f of the second optical system and the entrance pupil diameter EPD of the second optical system satisfy: 2.4<(f' / EPD') / (f / EPD)<5.

2.

3. The virtual reality device according to claim 1, characterized in that: A sum ΣCT' of center thicknesses of each lens from the first lens to the third lens on the first optical axis and a sum ΣCT of center thicknesses of each lens from the first lens to the eighth lens on the second optical axis satisfy: 0.7<ΣCT' / ΣCT<2.

5.

4. The virtual reality device according to claim 1, characterized in that: The maximum field of view FOV' of the first optical system and the maximum field of view FOV of the second optical system satisfy the following: 103°<(FOV-FOV')<119°.

5. The virtual reality device according to any one of claims 1 to 4, characterized in that: The combined focal length f23' of the second lens and the third lens and the combined focal length fz' of the first lens, the reflective polarizing element and the quarter-wave plate satisfy: 0.4 <f23' / |fz'|<1.0。 6. The virtual reality device according to any one of claims 1 to 4, characterized in that: The axial distance T12' from the second side surface of the first lens to the first side surface of the second lens, the center thickness CTR of the reflective polarizing element on the first optical axis, and the center thickness CTQ of the quarter-wave plate on the first optical axis satisfy: 2.2 <T12' / (CTR+CTQ)<3.6。 7. The virtual reality device according to any one of claims 1 to 4, characterized in that: The curvature radius R1' of the first side surface of the first lens and the curvature radius R3' of the first side surface of the second lens satisfy: 0.1 <R1' / R3'<0.7。 8. The virtual reality device according to any one of claims 1 to 4, characterized in that: The total effective focal length f' of the first optical system, the effective focal length f2' of the second lens and the effective focal length f3' of the third lens satisfy: -0.5 <f' / (f2'+f3')<0.1。 9. The virtual reality device according to any one of claims 1 to 4, characterized in that: The effective focal length f1 of the first lens, the effective focal length f2 of the second lens and the total effective focal length f of the second optical system satisfy: -7.7<(f1+f2) / f<-6.

5.

10. The virtual reality device according to any one of claims 1 to 4, characterized in that: The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: 0.5 <f3 / (f4+f5)<0.9。 11. The virtual reality device according to any one of claims 1 to 4, characterized in that: The effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the effective focal length f7 of the seventh lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: 1.6<(f6 / R11)×(f7 / R13)<3.

4.

12. The virtual reality device according to any one of claims 1 to 4, characterized in that: The effective focal length f8 of the eighth lens and the center thickness CT8 of the eighth lens on the second optical axis satisfy: 4.2 <f8 / CT8<5.0。 13. The virtual reality device according to any one of claims 1 to 4, characterized in that: The center thickness CT2 of the second lens on the second optical axis, the center thickness CT3 of the third lens on the second optical axis, the center thickness CT4 of the fourth lens on the second optical axis and the center thickness CT5 of the fifth lens on the second optical axis satisfy: 2.6<(CT4+CT5) / (CT2+CT3)<3.0.

Images