CN220626783U - Virtual reality device - Google Patents

Virtual reality device Download PDF

Info

Publication number
CN220626783U
CN220626783U CN202322100218.1U CN202322100218U CN220626783U CN 220626783 U CN220626783 U CN 220626783U CN 202322100218 U CN202322100218 U CN 202322100218U CN 220626783 U CN220626783 U CN 220626783U
Authority
CN
China
Prior art keywords
lens
optical system
focal length
virtual reality
reality device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202322100218.1U
Other languages
Chinese (zh)
Inventor
袁鸣
张晓彬
宋立通
游金兴
金银芳
赵烈烽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Sunny Optics Co Ltd
Original Assignee
Zhejiang Sunny Optics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Sunny Optics Co Ltd filed Critical Zhejiang Sunny Optics Co Ltd
Priority to CN202322100218.1U priority Critical patent/CN220626783U/en
Application granted granted Critical
Publication of CN220626783U publication Critical patent/CN220626783U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Lenses (AREA)

Abstract

The application discloses a virtual reality device, which comprises a first optical system and a second optical system, wherein the first optical system sequentially comprises a first element group and a second element group with positive optical power from a first side to a second side along a first optical axis, the first element group comprises a reflective polarizing element, a first lens, a quarter wave plate and a second lens, and the second element group comprises a third lens; the second optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an image side along a second optical axis; the sum Σct of the axial distance TD between the first side surface of the first lens and the second side surface of the third lens, the center thickness of each of the first lens to the third lens on the first optical axis, and the sum Σct of the axial distance TD between the object side surface of the first lens and the image side surface of the sixth lens and the center thickness of each of the first lens to the sixth lens on the second optical axis satisfy: 13.5< (TD '×ΣCT')/(TD×ΣCT) <17.5.

Description

Virtual reality device
Technical Field
The application relates to the field of optical devices, in particular to a virtual reality device.
Background
With the development of virtual reality technology, a higher requirement is put on a virtual reality device, for example, the virtual reality device needs to perform double-end capturing on a real scene and a virtual picture, so that an output image has both virtual and real properties.
In order to make the output image possess both the virtual and the real properties, the virtual reality device is generally configured in a combined structure of a catadioptric optical system and a transmissive optical system. However, this combination of multiple systems may result in a larger overall volume of the virtual reality device, and the transmissive optical system may be visible on the outer surface of the device, which may affect the appearance of the virtual reality device.
Disclosure of Invention
The present application provides a virtual reality device that may at least solve or partially solve at least one problem or other problems occurring in the prior art.
An aspect of the present application provides a virtual reality device including a first optical system and a second optical system, the first optical system including a first element group and a second element group in order from a first side to a second side along a first optical axis, wherein the first element group has positive optical power and includes a reflective polarizing element, a first lens, a quarter wave plate, and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; the second optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along a second optical axis, wherein the first lens and the sixth lens have negative focal power, the second lens and the fifth lens have positive focal power, and the focal power of the third lens and the fourth lens are opposite in sign; the second optical system is used for transmitting a virtual image of the display screen and the real image transmitted to the display screen, and the sum of the axial distances TD' of the first side surface of the first lens to the second side surface of the third lens and the central thicknesses of the lenses of the first lens to the third lens on the first optical axis and the sum of the axial distances TD of the object side surface of the first lens to the image side surface of the sixth lens and the sum of the axial distances Sigma CT of the central thicknesses of the lenses of the first lens to the sixth lens on the second optical axis are as follows: 13.5< (TD '×ΣCT')/(TD×ΣCT) <17.5.
According to an exemplary embodiment of the present application, the maximum field angle FOV' of the first optical system and the maximum field angle FOV of the second optical system satisfy: 16 ° < FOV-FOV' <24.2 °.
According to an exemplary embodiment of the present application, the effective focal length FG1 'of the first element group, the effective focal length FG2' of the second element group, the combined focal length f34 of the third lens and the fourth lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 0< | (FG 1'/FG 2')X (f 34/f 56) | <0.6.
According to an exemplary embodiment of the present application, the radius of curvature R1' of the first side of the first lens, the radius of curvature R3' of the first side of the second lens, and the effective focal length FG1' of the first element group satisfy: 7.5< |r1' +r3' |/FG1' <12.5.
According to an exemplary embodiment of the present application, the center thickness CT1 'of the first lens on the first optical axis, the center thickness CT2' of the second lens on the first optical axis, 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: 0.9< (CT 2 '+CTQ)/(CT 1' +CTR) <5.4.
According to an exemplary embodiment of the present application, the total effective focal length f ' of the first optical system, the maximum field angle FOV ' of the first optical system, and the on-axis distance TD ' from the first side of the first lens to the second side of the third lens satisfy: 2.3< (f ' ×tan (FOV '/2))/TD ' <2.8.
According to an exemplary embodiment of the present application, the radius of curvature R3 'of the first side of the second lens, the radius of curvature R4' of the second side of the second lens, the radius of curvature R5 'of the first side of the third lens and the radius of curvature R6' of the second side of the third lens satisfy: 0.2< (R5 '+R6')/(R3 '+R4') <0.7.
According to one exemplary embodiment of the present application, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 1.5< (f 1/f 2) × (f 3/f 4) <3.0.
According to an exemplary embodiment of the present application, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -0.1< (f5+f6)/(f5-f 6) <0.9.
According to one exemplary embodiment of the present application, the radius of curvature R2 of the image side surface of the first lens, the center thickness CT1 of the first lens on the second optical axis, and the air interval T12 of the first lens and the second lens on the second optical axis satisfy: 0.8< R2/(CT1+T12) <1.4.
According to an exemplary embodiment of the present application, the on-axis distance TD from the object side of the first lens to the image side of the sixth lens satisfies the combined focal length f234 of the second lens, the third lens and the fourth lens: 1.4< TD/f234<2.7.
According to an exemplary embodiment of the present application, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, and the center thickness CT2 of the second lens on the second optical axis satisfy: 6.7< (R3-R4)/CT 2<7.7.
According to an exemplary embodiment of the present application, the center thickness CT3 of the third lens on the second optical axis, the radius of curvature R6 of the image side of the third lens, the center thickness CT4 of the fourth lens on the second optical axis, and the radius of curvature R7 of the object side of the fourth lens satisfy: 2.3< (CT 4/CT 3) × (R7/R6) <4.7.
According to an exemplary embodiment of the present application, the sum Σct of the center thicknesses of each of the first to sixth lenses on the second optical axis, the air interval T12 of the first and second lenses on the second optical axis, and the air interval T56 of the fifth and sixth lenses on the second optical axis satisfy: 1.6< Σct/(t12+t56) <2.1.
The virtual reality device is configured into a structural form of combining the first optical system and the second optical system, and by restraining the sum of the axial distances from the first side surface of the first lens to the second side surface of the third lens in the first optical system, the center thickness of each lens, the axial distances from the object side surface of the first lens to the image side surface of the sixth lens in the second optical system and the center thickness of each lens, the first optical system can have a larger axial dimension, the second optical system has a smaller axial dimension, the dimensional design and the mold forming of the large-diameter lens in the first optical system and the small-diameter lens in the second optical system are facilitated, and aberration such as distortion can be effectively corrected while the space utilization rate and the compression volume of the virtual reality device are improved, and the visual immersion sense of the virtual reality device is further improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 shows a schematic plan view of a virtual reality device according to this application;
fig. 2 shows a schematic perspective view (front view) of a virtual reality device according to this application;
fig. 3 shows a schematic perspective view (rear view) of a virtual reality device according to this application;
fig. 4 shows a schematic structural view of a first optical system according to a first embodiment of the present application;
fig. 5A to 5C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the first optical system according to the first embodiment of the present application, respectively;
fig. 6 shows a schematic structural diagram of a first optical system according to a second embodiment of the present application;
fig. 7A to 7C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the first optical system according to the second embodiment of the present application, respectively;
fig. 8 shows a schematic structural view of a first optical system according to a third embodiment of the present application;
fig. 9A to 9C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the first optical system according to the third embodiment of the present application, respectively;
Fig. 10 shows a schematic structural view of a second optical system according to a fourth embodiment of the present application;
fig. 11A to 11C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the second optical system according to the fourth embodiment of the present application, respectively;
fig. 12 shows a schematic structural diagram of a second optical system according to a fifth embodiment of the present application;
fig. 13A to 13C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the second optical system according to fifth embodiment of the present application;
fig. 14 shows a schematic structural view of a second optical system according to a sixth embodiment of the present application;
fig. 15A to 15C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the second optical system according to the sixth embodiment of the present application, respectively;
fig. 16 shows a schematic structural view of a second optical system according to a seventh embodiment of the present application; and
fig. 17A to 17C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the second optical system according to the seventh embodiment of the present application, respectively.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification.
It should be noted that in the present 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 feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size and shape of the lenses and/or lenses have been slightly exaggerated for convenience of illustration. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens and/or lens surface is convex and the convex location is not defined, then it is meant that the lens and/or lens surface is convex at least in the paraxial region; if the lens and/or lens surface is concave and the concave location is not defined, it is meant that the lens and/or lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side (e.g., the human eye side) is referred to as the first side of the lens, and the surface of each lens closest to the second side (e.g., the display screen side) is referred to as the second side of the lens. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
Referring to fig. 1-3, a first aspect of the present application provides a virtual reality device that may include a first optical system and a second optical system. The second optical system is used for imaging a real scene, and the formed real image is transmitted to a display screen on the second side of the first optical system in an electric signal mode, and the first optical system is used for projecting a virtual image of the display screen and the real image transmitted to the display screen, wherein the virtual image 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 realized. The first optical system may be configured as a catadioptric optical system, the number of which may be one or more, and the second optical system may be configured as a transmissive optical system, the number of which may be one or more. In an example, the virtual reality device may include two first optical systems symmetrically disposed. In an example, the virtual reality device further includes a body, the first optical system may be disposed on an inner side of the body, and the second optical system may be disposed on an outer side of the body. In an example, the virtual reality device may further include a third optical system.
In an exemplary embodiment, the first optical system may include a first element group and a second element group sequentially arranged from a first side to a second side along the first optical axis. The first element group may include a reflective polarizing element, a first lens, a quarter wave plate, and a second lens. The second element group may include a third lens. The first element set and the second element set have an air space therebetween. In one example, the first element group has positive optical power. The second element group has positive or negative optical power.
In an exemplary embodiment, the first side may be a human eye side and the second side may be a 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 near-eye side, and the second side may be referred to as the near-screen side.
In an exemplary embodiment, the first optical system may further include a partially reflective layer, which may be attached to the second side of the third lens, for example. The partially reflective layer has a transflective effect on light. By arranging the partial reflecting layer on the second side surface of the third lens and combining the reflecting type polarized light element and the quarter wave plate, light rays can be reflected repeatedly, and the length of the body of the first optical system is effectively reduced.
In an exemplary embodiment, the first optical system may further comprise a diaphragm, which may be arranged, for example, between the first side and the first lens. The image light on the display screen is refracted and reflected for many times by the third lens, the second lens, the quarter wave plate, the first lens, the reflective polarizing element and the like, and finally projected to eyes of a user.
In an exemplary embodiment, image light from the display screen may sequentially pass through the third lens, the second lens, the quarter-wave plate, the first lens, reach the reflective polarizing element, and then be reflected at the reflective polarizing element to form first reflected image light. The first reflected image light passes through the first lens, the quarter wave plate, the second lens, the third lens and reaches the partially reflective layer, and then is reflected at the partially reflective layer to form second reflected image light. The second reflected image light passes through the third lens, the second lens, the quarter-wave plate, the first lens, the reflective polarizing element to the diaphragm in sequence and finally is projected into eyes of a user. In other examples, the order in which the image light, the first reflected image light, and the second reflected image light pass through the second lens and the quarter wave plate may be interchanged. The first optical system provided by the application folds the required optical path on the premise of not influencing the projection quality in a light reflection and refraction combined mode, and the length of the body of the first optical system is effectively shortened.
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, and a sixth lens, which are sequentially arranged from an object side to an image side along the second optical axis. An air space may be provided between adjacent two of the first lens to the sixth lens. In one example, the first lens and the sixth lens each have negative optical power, the second lens and the fifth lens each have positive optical power, and the optical powers of the third lens and the fourth lens are opposite in sign.
The first optical system in the application is used for transmitting the virtual image of the display screen to eyes of a user, the second optical system is used for imaging a real scene, the formed real image is transmitted to the display screen of the first optical system through the chip of the second optical system, and the first optical system transmits the real image on the display screen to the user, so that the user can watch the image fused by the virtual picture and the real scene, and visual immersion of the virtual reality device is improved.
In an exemplary embodiment, an on-axis distance TD 'of the first side surface of the first lens to the second side surface of the third lens, a sum Σct' of center thicknesses of the respective lenses of the first lens to the third lens on the first optical axis, an on-axis distance TD of the object side surface of the first lens to the image side surface of the sixth lens, and a sum Σct of center thicknesses of the respective lenses of the first lens to the sixth lens on the second optical axis may satisfy: 13.5< (TD '×ΣCT')/(TD×ΣCT) <17.5. Through controlling the conditional expression, the first optical system can have larger axial dimension, the second optical system has smaller axial dimension, the dimension design and the mold forming of the large-diameter lens in the first optical system and the small-diameter lens in the second optical system are facilitated, the space utilization rate and the compression volume of the virtual reality device can be improved, meanwhile, aberration such as distortion can be effectively corrected, the imaging quality of the virtual reality device is improved, and the visual immersion feeling of the virtual reality device is further improved.
In an exemplary embodiment, the maximum field angle FOV' of the first optical system and the maximum field angle FOV of the second optical system may satisfy: 16 ° < FOV-FOV' <24.2 °. The difference value of the maximum field angle of the second optical system and the maximum field angle of the first optical system are restrained within a reasonable range, so that the connection of the fields of view of the two systems is regulated, the picture fusion effect is guaranteed, and meanwhile, the problem of picture edge deletion caused by insufficient picture ingestion can be avoided by enabling the maximum field angle of the second optical system to be larger than the maximum field angle of the first optical system, and further the problems of residual light shielding and potential safety hazard formation caused by the picture edge deletion are avoided.
In an exemplary embodiment, the effective focal length FG1 'of the first element group, the effective focal length FG2' of the second element group, the combined focal length f34 of the third lens and the fourth lens, and the combined focal length f56 of the fifth lens and the sixth lens may satisfy: 0< | (FG 1'/FG 2')X (f 34/f 56) | <0.6. The effective focal length ratio of the first element group and the second element group and the combined focal length ratio of the third lens and the fourth lens and the combined focal length ratio of the fifth lens and the sixth lens are restrained, so that focal length distribution of respective systems and focal length connection of the combined systems are facilitated, the product of the two ratios is limited in a smaller range, the axial distance and the visual field are indirectly controlled, the whole machine volume and the design of larger perspective and projection visual fields are facilitated, visual immersion is ensured, and the light weight of the virtual reality device is facilitated.
In an exemplary embodiment, the radius of curvature R1' of the first side of the first lens, the radius of curvature R3' of the first side of the second lens, and the effective focal length FG1' of the first element group may satisfy: 7.5< |r1' +r3' |/FG1' <12.5. Through controlling the conditional expression, the first side surfaces of the first lens and the second lens can have larger curvature radius so as to facilitate the attachment of the reflective polarizing element and the quarter-wave plate, and meanwhile, the effective focal length of the first element group is restrained to indirectly control the entrance pupil light and the exit pupil distance, so that the lens is suitable to wear.
In an exemplary embodiment, a center thickness CT1 'of the first lens on the first optical axis, a center thickness CT2' of the second lens on the first optical axis, a center thickness CTR of the reflective polarizing element on the first optical axis, and a center thickness CTQ of the quarter-wave plate on the first optical axis may satisfy: 0.9< (CT 2 '+CTQ)/(CT 1' +CTR) <5.4. Through controlling the conditional expression, the central thicknesses of the first lens, the second lens, the reflective polarizing element and the quarter wave plate can be reasonably distributed, the refractive length of polarized light rays can be controlled, the body length of the first optical system is compressed, and therefore the volume of the virtual reality device is controlled.
In an exemplary embodiment, the total effective focal length f ' of the first optical system, the maximum field angle FOV ' of the first optical system, and the on-axis distance TD ' of the first side of the first lens to the second side of the third lens may satisfy: 2.3< (f ' ×tan (FOV '/2))/TD ' <2.8. The total effective focal length and the maximum field angle of the first optical system can be constrained by controlling the above conditions, so that the size of the display screen is indirectly controlled, and the selection of the display screen is facilitated; meanwhile, the axial distance from the first side surface of the first lens to the second side surface of the third lens can be limited, the first optical system is limited to be small and reasonable in size in the axial direction and the longitudinal direction, and the whole virtual reality device is convenient to lighten.
In an exemplary embodiment, the radius of curvature R3 'of the first side of the second lens, the radius of curvature R4' of the second side of the second lens, the radius of curvature R5 'of the first side of the third lens, and the radius of curvature R6' of the second side of the third lens may satisfy: 0.2< (R5 '+R6')/(R3 '+R4') <0.7. The ratio of the sum of the curvature radiuses of the first side surface and the second side surface of the third lens to the sum of the curvature radiuses of the first side surface and the second side surface of the second lens is limited in a reasonable range, so that the third lens is favorably provided with a reasonable curvature radius to compensate marginal ray aberration generated by the second lens due to the limitation of the curvature setting of the quarter wave plate, and the main value parameter is convenient to regulate and control.
In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens may satisfy: 1.5< (f 1/f 2) × (f 3/f 4) <3.0. Through controlling the conditional expression, the effective focal length ratio of the first lens and the second lens and the effective focal length ratio of the third lens and the fourth lens can be restrained, the product of the two ratios is restrained within a reasonable range, the focal length distribution and the control of the entrance pupil field of view of adjacent positive and negative lenses are facilitated, the incident light range and the brightness can be indirectly controlled, and the problems of composite picture color display conflict and the like caused by overlarge information difference between a real scene and a virtual picture brightness and the like are avoided.
In an exemplary embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens may satisfy: -0.1< (f5+f6)/(f5-f 6) <0.9. The ratio of the sum of the effective focal lengths of the fifth lens and the sixth lens to the difference between the effective focal lengths of the fifth lens and the sixth lens is limited in a reasonable range, so that the effective focal lengths of the fifth lens and the sixth lens can be reasonably distributed, and the emergent ray range of the second optical system can be controlled at intervals, so that a chip matched with the chip can be conveniently selected.
In an exemplary embodiment, the radius of curvature R2 of the image side surface of the first lens, the center thickness CT1 of the first lens on the second optical axis, and the air interval T12 of the first lens and the second lens on the second optical axis may satisfy: 0.8< R2/(CT1+T12) <1.4. The ratio of the curvature radius of the image side surface of the first lens to the sum of the thicknesses of the first lens and the air gap thereof is limited in a reasonable range, so that the ultrathin and miniaturized first lens can be further realized on the basis of ensuring the molding strength and the assembling interval of the first lens, the exposed surface area of the second optical system is reduced, and the visual abrupt sense of the second optical system is weakened.
In an exemplary embodiment, the on-axis distance TD from the object side of the first lens to the image side of the sixth lens and the combined focal length f234 of the second, third and fourth lenses may satisfy: 1.4< TD/f234<2.7. The ratio of the axial distance from the object side surface of the first lens to the image side surface of the sixth lens to the combined focal length of the second lens, the third lens and the fourth lens is constrained within a reasonable range, so that the focal length of the lenses is reasonably distributed on the basis of ensuring that the second optical system has smaller total optical length, the second optical system is compact in structure while ensuring performance, and the second optical system is miniaturized.
In an exemplary embodiment, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, and the center thickness CT2 of the second lens on the second optical axis may satisfy: 6.7< (R3-R4)/CT 2<7.7. The ratio of the difference value of the curvature radiuses of the object side surface and the image side surface of the second lens to the midthickness of the second lens is constrained within a reasonable range, so that the second lens has positive focal power on the basis of ensuring the molding and strength of the second lens, the light rays are conveniently converged, and the edge aberration of the second optical system is corrected.
In an exemplary embodiment, the center thickness CT3 of the third lens on the second optical axis, the radius of curvature R6 of the image side surface of the third lens, the center thickness CT4 of the fourth lens on the second optical axis, and the radius of curvature R7 of the object side surface of the fourth lens may satisfy: 2.3< (CT 4/CT 3) × (R7/R6) <4.7. By controlling the conditional expression, the ratio of the middle thickness of the fourth lens to the third lens and the ratio of the curvature radius of the object side surface of the fourth lens to the image side surface of the third lens can be restrained, the product of the two ratios is limited in a reasonable range, the forming of the third lens and the fourth lens is facilitated, the third lens and the fourth lens can have opposite focal power, so that the off-axis aberration such as astigmatism, distortion and the like can be optimized, and the imaging quality of the second optical system can be improved.
In an exemplary embodiment, a sum Σct of center thicknesses of each of the first to sixth lenses on the second optical axis, an air interval T12 of the first and second lenses on the second optical axis, and an air interval T56 of the fifth and sixth lenses on the second optical axis may satisfy: 1.6< Σct/(t12+t56) <2.1. By controlling the conditional expressions, the positions of the first lens, the second lens, the fifth lens and the sixth lens can be reasonably distributed, and the lenses are prevented from interfering on the basis that the lenses meet the assembly conditions; meanwhile, the optical total length of the second optical system can be compressed, and miniaturization of the second optical system is facilitated.
The virtual reality device according to the above embodiment of the present application is composed of a first optical system and a second optical system, wherein the first optical system may employ a plurality of lenses, such as the three lenses described above, and the second optical system may employ a plurality of lenses, such as the six lenses described above. By reasonably configuring parameters of the first optical system and the second optical system, imaging quality and visual immersion of the virtual reality device can be improved. The virtual reality device with the configuration has the characteristics of miniaturization, good imaging quality and the like, and can well meet the use requirements of various portable electronic products in projection scenes.
In an embodiment of the present application, at least one of the mirrors of each of the first to third lenses is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies 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 radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality. Similarly, at least one of the mirrors of each of the first lens to the sixth lens is an aspherical mirror.
However, those skilled in the art will appreciate that the number of lenses and/or lenses can be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein.
Referring to fig. 1 to 3, a second aspect of the present application provides a virtual reality device, which may include a first optical system and a second optical system, the first optical system including a first element group and a second element group in order from a first side to a second side along a first optical axis, wherein the first element group has positive optical power and includes a reflective polarizing element, a first lens, a quarter wave plate, and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; the second optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along a second optical axis, wherein the first lens and the sixth lens have negative focal power, the second lens and the fifth lens have positive focal power, and the focal power of the third lens and the fourth lens are opposite in sign;
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 an electric signal mode, the first optical system is used for projecting a virtual image of the display screen and the real image transmitted to the display screen, and the maximum field angle FOV' of the first optical system and the maximum field angle FOV of the second optical system can be satisfied: 16 ° < FOV-FOV' <24.2 °. The difference value of the maximum field angle of the second optical system and the maximum field angle of the first optical system are restrained within a reasonable range, so that the connection of the fields of view of the two systems is regulated, the basic picture fusion effect is guaranteed, and meanwhile, the problem of picture edge deletion caused by insufficient view intake can be avoided by enabling the maximum field angle of the second optical system to be larger than the maximum field angle of the first optical system, and further the problems of residual light shielding and potential safety hazard formation caused by the picture edge deletion are avoided.
Referring to fig. 1 to 3, a third aspect of the present application provides a virtual reality device, which may include a first optical system and a second optical system, the first optical system including a first element group and a second element group in order from a first side to a second side along a first optical axis, wherein the first element group has positive optical power and includes a reflective polarizing element, a first lens, a quarter wave plate, and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens; the second optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along a second optical axis, wherein the first lens and the sixth lens have negative focal power, the second lens and the fifth lens have positive focal power, and the focal power of the third lens and the fourth lens are opposite in sign;
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 an electrical signal mode, the first optical system is used for projecting a virtual image of the display screen and the real image transmitted to the display screen, and the effective focal length FG1 'of the first element group, the effective focal length FG2' of the second element group, the combined focal length f34 of the third lens and the fourth lens and the combined focal length f56 of the fifth lens and the sixth lens can satisfy the following conditions: 0< | (FG 1'/FG 2')X (f 34/f 56) | <0.6. The effective focal length ratio of the first element group and the second element group and the combined focal length ratio of the third lens and the fourth lens and the combined focal length ratio of the fifth lens and the sixth lens are restrained, so that focal length distribution of respective systems and focal length connection of the combined systems are facilitated, the product of the two ratios is limited in a smaller range, the axial distance and the view field are indirectly controlled, the design of a smaller whole machine volume and a larger perspective and projection view field is facilitated, and the light weight of the virtual reality device is facilitated while visual immersion is ensured.
Specific examples of the first optical system applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
A first optical system according to a first embodiment of the present application is described below with reference to fig. 4 to 5C.
As shown in fig. 4, the first optical system 100 includes a first element group and a second element group sequentially arranged from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first lens E1', a quarter wave plate QWP, and a second lens E2'. The second element group includes a third lens E3'. 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 (first lens E1', second lens E2', third lens E3', reflective polarizing element RP, quarter wave plate QWP) is referred to as the near-eye side, and the second side is referred to as the near-screen side.
The first lens E1' has negative focal power, and the near-human-eye side S2 is concave and the near-screen side S3 is convex. The reflective polarizing element RP has a near-eye side surface S1 and a near-screen side surface, and the near-screen side surface of the reflective polarizing element RP is attached to the near-eye side surface S2 of the first lens E1'. The second lens E2' has positive optical power, and its near-eye side S5 is concave and near-screen side S6 is convex. The quarter wave plate QWP has a near-eye side S4 and a near-screen side attached to the near-eye side S5 of the second lens E2'. The third lens E3' has positive optical power, and the near-human-eye side S7 is concave and the near-screen side S8 is convex. The partially reflective layer BS may be attached to the near-screen side S8 of the third lens E3'.
In this example, the second side of the first optical system 100 may be provided with an image surface S9, and the image surface S9 may be provided with a display screen, for example. After the image light from the display screen passes through the third lens E3', the second lens E2', the quarter wave plate QWP, the first lens E1' and reaches the reflective polarizing element RP in order, the first reflection occurs at the reflective polarizing element RP. After the light reflected once passes through the first lens E1', the quarter wave plate QWP, the second lens E2', the third lens E3', and reaches the partially reflective layer BS, a second reflection occurs at the partially 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 first lens E1', the reflective polarizing element RP, and finally, the target object (not shown) in the projection space in this order. For example, the light reflected by the first optical system 100 is finally projected into the eyes of the user.
Table 1 shows a basic parameter table of the first optical system of the first embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm). Image light from the display screen passes through the elements in the order of serial number 22 to serial number 1 and is finally projected into the human eye.
TABLE 1
In this embodiment, the effective focal length FG1' of the first element group has a value of 26.53mm, the effective focal length FG2' of the second element group has a value of 1632.73mm, the total effective focal length f ' of the first optical system has a value of 27.01mm, the maximum field angle FOV ' of the first optical system has a value of 106.0 °, and the entrance pupil diameter EPD ' of the first optical system has a value of 4.75mm.
In the present embodiment, the near-eye side surface S2 and the near-screen side surface S3 of the first lens E1', the near-eye side surface S5 and the near-screen side surface S6 of the second lens E2', and the near-eye side surface S7 and the near-screen side surface S8 of the third lens E3' are all aspheric, and the surface profile x of each aspheric lens can be defined by, but not limited to, the following aspheric formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R '(i.e., paraxial curvature c is the inverse of radius of curvature R' in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 shows the higher order coefficients A that can be used for the aspherical mirror surfaces S2-S3, S5-S8 in example one 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
Face number S2 S3 S5 S6 S7 S8
A4 -7.9810E-02 -7.4618E-02 1.8085E-01 -2.0494E-02 5.0107E-02 -1.2494E-01
A6 2.1117E-01 1.1100E-02 1.5478E-01 2.3710E-01 -2.2870E-01 1.3742E-01
A8 -2.5673E-02 -4.0165E-02 1.0655E-01 3.5318E-02 5.5880E-02 -2.4228E-02
A10 -2.1089E-03 8.2333E-02 6.5995E-02 5.5384E-02 7.6164E-02 -2.3920E-03
A12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
TABLE 2
Fig. 5A shows an on-axis chromatic aberration curve of the first optical system of the first embodiment, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the first optical system. Fig. 5B shows an astigmatism curve of the first optical system of the first embodiment, which represents a meridional image plane curvature and a sagittal image plane curvature corresponding to different angles of view. Fig. 5C shows a distortion curve of the first optical system of the first embodiment, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 5A to 5C, the first optical system according to the first embodiment can achieve good imaging quality.
Example two
The first optical system according to the second embodiment of the present application is described below with reference to fig. 6 to 7C.
As shown in fig. 6, the first optical system 100 includes a first element group and a second element group sequentially arranged from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first lens E1', a quarter wave plate QWP, and a second lens E2'. The second element group includes a third lens E3'. 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 (first lens E1', second lens E2', third lens E3', reflective polarizing element RP, quarter wave plate QWP) is referred to as the near-eye side, and the second side is referred to as the near-screen side.
The first lens E1' has negative focal power, and the near-human-eye side S2 is concave and the near-screen side S3 is convex. The reflective polarizing element RP has a near-eye side surface S1 and a near-screen side surface, and the near-screen side surface of the reflective polarizing element RP is attached to the near-eye side surface S2 of the first lens E1'. The second lens E2' has positive optical power, and its near-eye side S5 is concave and near-screen side S6 is convex. The quarter wave plate QWP has a near-eye side S4 and a near-screen side attached to the near-eye side S5 of the second lens E2'. The third lens E3' has negative optical power, and the near-human-eye side S7 is concave and the near-screen side S8 is convex. The partially reflective layer BS may be attached to the near-screen side S8 of the third lens E3'.
In this example, the second side of the first optical system 100 may be provided with an image surface S9, and the image surface S9 may be provided with a display screen, for example. After the image light from the display screen passes through the third lens E3', the second lens E2', the quarter wave plate QWP, the first lens E1' and reaches the reflective polarizing element RP in order, the first reflection occurs at the reflective polarizing element RP. After the light reflected once passes through the first lens E1', the quarter wave plate QWP, the second lens E2', the third lens E3', and reaches the partially reflective layer BS, a second reflection occurs at the partially 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 first lens E1', the reflective polarizing element RP, and finally, the target object (not shown) in the projection space in this order. For example, the light reflected by the first optical system 100 is finally projected into the eyes of the user.
Table 3 shows a basic parameter table of the first optical system of the second embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm). Image light from the display screen passes through the elements in the order of serial number 22 to serial number 1 and is finally projected into the human eye.
TABLE 3 Table 3
In this embodiment, the effective focal length FG1' of the first element group has a value of 25.97mm, the effective focal length FG2' of the second element group has a value of-245.99 mm, the total effective focal length f ' of the first optical system has a value of 27.00mm, the maximum field angle FOV ' of the first optical system has a value of 106.0 °, and the entrance pupil diameter EPD ' of the first optical system has a value of 4.75mm.
In the present embodiment, the near-eye side surface S2 and the near-screen side surface S3 of the first lens E1', the near-eye side surface S5 and the near-screen side surface S6 of the second lens E2', and the near-eye side surface S7 and the near-screen side surface S8 of the third lens E3' are aspherical surfaces. Table 4 shows the higher order coefficients A that can be used for the aspherical mirror surfaces S2-S3, S5-S8 in example two 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
Face number S2 S3 S5 S6 S7 S8
A4 -3.7851E-02 -1.4285E-01 2.4411E-01 5.6199E-02 -1.3414E-01 -2.8145E-02
A6 1.0873E-01 -2.0271E-01 1.2509E-02 2.4299E-01 -1.9244E-01 -1.5688E-03
A8 -2.6907E-02 1.2802E-01 7.1883E-02 -8.7751E-02 1.2306E-01 -1.2098E-02
A10 -4.2128E-03 -2.3350E-03 -3.2997E-02 -4.8852E-03 8.4233E-03 1.4049E-02
A12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
TABLE 4 Table 4
Fig. 7A shows an on-axis chromatic aberration curve of the first optical system of the second embodiment, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the first optical system. Fig. 7B shows an astigmatism curve of the first optical system of the second embodiment, which represents a meridional image plane curvature and a sagittal image plane curvature corresponding to different angles of view. Fig. 7C shows a distortion curve of the first optical system of the second embodiment, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 7A to 7C, the first optical system according to the second embodiment can achieve good imaging quality.
Example III
The first optical system according to the third embodiment of the present application is described below with reference to fig. 8 to 9C.
As shown in fig. 8, the first optical system 100 includes a first element group and a second element group sequentially arranged from a first side to a second side along a first optical axis. The first element group includes a reflective polarizing element RP, a first lens E1', a second lens E2', and a quarter wave plate QWP. The second element group includes a third lens E3'. 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 (first lens E1', second lens E2', third lens E3', reflective polarizing element RP, quarter wave plate QWP) is referred to as the near-eye side, and the second side is referred to as the near-screen side.
The first lens E1' has negative focal power, and the near-human-eye side S2 is concave and the near-screen side S3 is convex. The reflective polarizing element RP has a near-eye side surface S1 and a near-screen side surface, and the near-screen side surface of the reflective polarizing element RP is attached to the near-eye side surface S2 of the first lens E1'. The second lens E2' has negative focal power, and its near-eye side S4 is concave and near-screen side S5 is convex. The quarter wave plate QWP has a near-human eye side and a near-screen side S6, which is attached to the near-screen side S5 of the second lens E2'. The third lens E3' has positive optical power, and the near-human-eye side S7 is concave and the near-screen side S8 is convex. The partially reflective layer BS may be attached to the near-screen side S8 of the third lens E3'.
In this example, the second side of the first optical system 100 may be provided with an image surface S9, and the image surface S9 may be provided with a display screen, for example. After the image light from the display screen passes through the third lens E3', the quarter wave plate QWP, the second lens E2', the first lens E1' and reaches the reflective polarizing element RP in order, the first reflection occurs at the reflective polarizing element RP. After the light reflected once passes through the first lens E1', the second lens E2', the quarter wave plate QWP, the third lens E3', and reaches the partially reflective layer BS, a second reflection occurs at the partially reflective layer BS. The light reflected the second time passes through the third lens E3', the quarter wave plate QWP, the second lens E2', the first lens E1', the reflective polarizing element RP, and finally, the target object (not shown) in the projection space in this order. For example, the light reflected by the first optical system 100 is finally projected into the eyes of the user.
Table 5 shows a basic parameter table of the first optical system of the third embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm). Image light from the display screen passes through the elements in the order of serial number 22 to serial number 1 and is finally projected into the human eye.
TABLE 5
In this embodiment, the effective focal length FG1' of the first element group has a value of 28.43mm, the effective focal length FG2' of the second element group has a value of 124.49mm, the total effective focal length f ' of the first optical system has a value of 26.98mm, the maximum field angle FOV ' of the first optical system has a value of 106.0 °, and the entrance pupil diameter EPD ' of the first optical system has a value of 4.75mm.
In the present embodiment, the near-eye side surface S2 and the near-screen side surface S3 of the first lens E1', the near-eye side surface S4 and the near-screen side surface S5 of the second lens E2', and the near-eye side surface S7 and the near-screen side surface S8 of the third lens E3' are aspherical surfaces. Table 6 shows the higher order coefficients A that can be used for the aspherical mirror surfaces S2-S5, S7-S8 in example three 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
Face number S2 S3 S4 S5 S7 S8
A4 1.0056E-01 -2.3882E-02 -1.4669E-01 -7.6522E-03 2.2820E-01 5.9068E-02
A6 1.5297E-01 -2.7677E-01 6.1747E-03 2.0020E-01 -1.0397E-01 8.5962E-02
A8 -1.0683E-02 -2.9121E-02 9.8231E-02 1.0100E-01 -4.5125E-02 -1.5147E-03
A10 -7.8235E-03 -5.7033E-03 6.1498E-02 3.8433E-02 -1.5031E-02 3.8758E-03
A12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A16 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A18 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
A20 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
TABLE 6
Fig. 9A shows an on-axis chromatic aberration curve of the first optical system of the third embodiment, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the first optical system. Fig. 9B shows an astigmatism curve of the first optical system of the third embodiment, which represents a meridional image plane curvature and a sagittal image plane curvature corresponding to different angles of view. Fig. 9C shows a distortion curve of the first optical system of the third embodiment, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 9A to 9C, the first optical system according to the third embodiment can achieve good imaging quality.
Specific examples of the second optical system applicable to the above-described embodiments are further described below with reference to the drawings.
Example IV
The second optical system according to the fourth embodiment of the present application is described below with reference to fig. 10 to 11C.
As shown in fig. 10, 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, and a sixth lens E6, which are sequentially arranged from the object side to the image side along the second optical axis. The stop STO may be disposed between the first lens E1 and the second lens E2.
The first lens element E1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein the object-side surface S3 is convex, and the image-side surface S4 is convex. The third lens element E3 has positive refractive power, the object-side surface S5 thereof is concave, and the image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein the object-side surface S7 is concave, and the image-side surface S8 is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, and its object-side surface S11 is concave and its image-side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 7 shows a basic parameter table of the second optical system of the fourth embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 7
In this embodiment, the total effective focal length f of the second optical system is 2.08mm, the maximum field angle FOV of the second optical system is 130.08 °, the combined focal length f234 of the second lens, the third lens and the fourth lens is 3.17mm, the combined focal length f34 of the third lens and the fourth lens is-6.80 mm, and the combined focal length f56 of the fifth lens and the sixth lens is 2.76mm.
In the present embodiment, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspheric, and the surface shape x of each aspheric lens can be defined by, but not limited to, the following aspheric formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 8 shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S12 in example four 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
Face number A4 A6 A8 A10 A12 A14 A16
S1 5.3530E-03 5.5944E-03 -5.1516E-02 8.5538E-02 -6.6786E-02 2.5677E-02 -3.9256E-03
S2 6.7215E-02 -9.6751E-02 9.3328E-01 -3.6338E+00 7.6131E+00 -7.8087E+00 3.2575E+00
S3 -3.2741E-02 5.2083E-02 -4.0829E-01 1.3047E+00 -2.3728E+00 2.1906E+00 -8.5286E-01
S4 -2.0206E-01 6.5647E-04 4.3282E-01 -8.2242E-01 8.5986E-01 -5.1282E-01 1.2783E-01
S5 -2.6645E-01 -5.4066E-02 -2.1073E-01 1.4248E+00 -2.3947E+00 1.7886E+00 -5.0080E-01
S6 -9.1744E-02 1.0603E+00 -3.1389E+00 4.5815E+00 -3.6242E+00 1.5133E+00 -2.6515E-01
S7 -1.7928E-01 1.6012E+00 -4.2264E+00 5.5655E+00 -3.9303E+00 1.4426E+00 -2.1762E-01
S8 -1.8054E-01 -7.8645E-02 1.1473E-02 1.8240E-01 -2.1140E-01 1.2065E-01 -2.5802E-02
S9 1.3650E-01 -2.7011E-01 2.7449E-01 -2.3475E-01 1.5100E-01 -5.4015E-02 7.8118E-03
S10 -1.3580E-01 4.9439E-01 -7.3243E-01 5.7346E-01 -2.6691E-01 7.4026E-02 -9.1947E-03
S11 -3.8551E-02 -1.9620E-01 2.7493E-01 -1.7859E-01 7.3786E-02 -1.8022E-02 1.9325E-03
S12 -1.6484E-01 3.0050E-02 3.1251E-02 -2.8981E-02 1.0768E-02 -1.9716E-03 1.2498E-04
TABLE 8
Fig. 11A shows an on-axis chromatic aberration curve of the second optical system of the fourth embodiment, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the second optical system. Fig. 11B shows an astigmatism curve of the second optical system of the fourth embodiment, which represents meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Fig. 11C shows a distortion curve of the second optical system of the fourth embodiment, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 11A to 11C, the second optical system according to the fourth embodiment can achieve good imaging quality.
Example five
A second optical system according to a fifth embodiment of the present application is described below with reference to fig. 12 to 13C.
As shown in fig. 12, 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, and a sixth lens E6, which are sequentially arranged from the object side to the image side along the second optical axis. The stop STO may be disposed between the first lens E1 and the second lens E2.
The first lens element E1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein the object-side surface S3 is convex, and the image-side surface S4 is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, the object-side surface S9 thereof is concave, and the image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, and its object-side surface S11 is concave and its image-side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 9 shows a basic parameter table of the second optical system of the fifth embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 9
In this embodiment, the total effective focal length f of the second optical system is 2.08mm, the maximum field angle FOV of the second optical system is 130.01 °, the combined focal length f234 of the second lens, the third lens and the fourth lens is 1.95mm, the combined focal length f34 of the third lens and the fourth lens is 6.09mm, and the combined focal length f56 of the fifth lens and the sixth lens is-9.57 mm.
In the present embodiment, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. TABLE 10 shows the higher order term coefficient A applicable to each of the aspherical mirror surfaces S1 to S12 in embodiment five 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
Face number A4 A6 A8 A10 A12 A14 A16
S1 7.5887E-03 -1.7130E-02 7.4595E-03 3.8535E-03 -5.3059E-03 2.0347E-03 -2.7219E-04
S2 7.8517E-02 -1.2575E-01 7.7041E-01 -2.3239E+00 4.0801E+00 -3.6416E+00 1.3468E+00
S3 -2.4704E-02 2.7609E-02 -3.7068E-01 1.0432E+00 -1.7148E+00 1.4439E+00 -5.2895E-01
S4 -8.0427E-02 -1.0804E-01 -1.9391E-01 1.1513E+00 -1.6314E+00 9.8870E-01 -2.2806E-01
S5 -2.9455E-01 7.9995E-01 -3.0975E+00 6.0917E+00 -6.3764E+00 3.4653E+00 -7.7278E-01
S6 -1.9388E-01 1.1210E+00 -3.1683E+00 4.8531E+00 -4.1726E+00 1.9367E+00 -3.7969E-01
S7 -7.7450E-02 9.9294E-02 6.1611E-02 -6.0148E-01 8.8645E-01 -4.9832E-01 9.9316E-02
S8 6.1741E-02 -7.8135E-01 1.2150E+00 -8.6289E-01 2.7553E-01 -1.0065E-02 -6.4964E-03
S9 1.6078E-01 -6.5052E-01 4.5306E-01 5.2481E-01 -9.0612E-01 4.7171E-01 -8.7235E-02
S10 -2.9990E-02 4.0891E-02 -3.0933E-01 5.8714E-01 -4.4380E-01 1.4261E-01 -1.4748E-02
S11 -1.7737E-01 -1.5765E-03 2.1500E-01 -2.0450E-01 7.6347E-02 -6.6406E-03 -1.2598E-03
S12 -2.9377E-01 2.1673E-01 -1.2184E-01 4.9745E-02 -1.5595E-02 3.4638E-03 -4.0341E-04
Table 10
Fig. 13A shows an on-axis chromatic aberration curve of the second optical system of the fifth embodiment, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the second optical system. Fig. 13B shows an astigmatism curve of the second optical system of the fifth embodiment, which represents meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Fig. 13C shows a distortion curve of the second optical system of the fifth embodiment, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 13A to 13C, the second optical system according to the fifth embodiment can achieve good imaging quality.
Example six
The second optical system according to the sixth embodiment of the present application is described below with reference to fig. 14 to 15C.
As shown in fig. 14, 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, and a sixth lens E6, which are sequentially arranged from the object side to the image side along the second optical axis. The stop STO may be disposed between the first lens E1 and the second lens E2.
The first lens element E1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein the object-side surface S3 is convex, and the image-side surface S4 is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein the object-side surface S9 thereof is convex, and the image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, and its object-side surface S11 is concave and its image-side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 11 shows a basic parameter table of the second optical system of the sixth embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm).
TABLE 11
In this embodiment, the total effective focal length f of the second optical system is 2.08mm, the maximum field angle FOV of the second optical system is 122.01 °, the combined focal length f234 of the second lens, the third lens and the fourth lens is 1.72mm, the combined focal length f34 of the third lens and the fourth lens is 3.00mm, and the combined focal length f56 of the fifth lens and the sixth lens is-2.82 mm.
In the present embodiment, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 12 shows the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1-S12 in example six 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
Table 12
Fig. 15A shows an on-axis chromatic aberration curve of the second optical system of the sixth embodiment, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the second optical system. Fig. 15B shows an astigmatism curve of the second optical system of the sixth embodiment, which represents meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Fig. 15C shows a distortion curve of the second optical system of the sixth embodiment, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 15A to 15C, the second optical system according to the sixth embodiment can achieve good imaging quality.
Example seven
A second optical system according to a seventh embodiment of the present application is described below with reference to fig. 16 to 17C.
As shown in fig. 16, 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, and a sixth lens E6, which are sequentially arranged from the object side to the image side along the second optical axis. The stop STO may be disposed between the first lens E1 and the second lens E2.
The first lens element E1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein the object-side surface S3 is convex, and the image-side surface S4 is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, and its object-side surface S11 is concave and its image-side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 13 shows a basic parameter table of the second optical system of the seventh embodiment, in which the unit of curvature radius, thickness/distance is millimeter (mm).
/>
TABLE 13
In this embodiment, the total effective focal length f of the second optical system is 2.08mm, the maximum field angle FOV of the second optical system is 122.04 °, the combined focal length f234 of the second lens, the third lens and the fourth lens is 2.15mm, the combined focal length f34 of the third lens and the fourth lens is 13.10mm, and the combined focal length f56 of the fifth lens and the sixth lens is 13.92mm.
In the present embodiment, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 14 shows the higher order term coefficients A that can be used for S1-S12 in example seven 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
Face number A4 A6 A8 A10 A12 A14 A16
S1 3.5258E-02 -7.4437E-02 6.2196E-02 -2.9202E-02 7.7591E-03 -1.0417E-03 5.1269E-05
S2 -3.9109E-02 2.4254E-01 -5.6360E-01 5.1938E-01 8.9814E-01 -2.0271E+00 1.1933E+00
S3 -2.4740E-02 5.7415E-02 -6.0086E-01 1.9089E+00 -3.3620E+00 3.0000E+00 -1.1153E+00
S4 -1.0416E-01 -7.4064E-02 -1.6498E-01 1.1300E+00 -1.7557E+00 1.1533E+00 -2.8467E-01
S5 -2.9177E-01 7.9142E-01 -3.1417E+00 6.5931E+00 -7.4649E+00 4.3826E+00 -1.0496E+00
S6 -2.7139E-01 1.5701E+00 -4.3663E+00 6.8713E+00 -6.2278E+00 3.0603E+00 -6.3087E-01
S7 -1.6134E-01 4.8812E-01 -7.3209E-01 4.3901E-01 -3.0129E-02 -2.0669E-02 -7.8021E-03
S8 -9.0941E-02 -3.4152E-01 6.2125E-01 -3.6946E-01 -1.2646E-01 2.4610E-01 -7.3715E-02
S9 1.3064E-01 -5.1378E-01 7.0942E-01 -4.8505E-01 1.5673E-01 -7.5675E-03 -5.9642E-03
S10 -1.7475E-02 7.9186E-03 -1.5756E-01 3.4862E-01 -2.9490E-01 1.1230E-01 -1.6133E-02
S11 -1.6983E-01 -6.1748E-02 2.9700E-01 -2.4291E-01 7.7272E-02 -3.1978E-03 -1.8396E-03
S12 -2.5001E-01 1.2718E-01 -2.7560E-02 -8.4084E-03 4.6545E-03 -1.7606E-04 -1.4694E-04
TABLE 14
Fig. 17A shows an on-axis chromatic aberration curve of the second optical system of the seventh embodiment, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the second optical system. Fig. 17B shows an astigmatism curve of the second optical system of the seventh embodiment, which represents meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Fig. 17C shows a distortion curve of the second optical system of the seventh embodiment, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 17A to 17C, the second optical system according to the seventh embodiment can achieve good imaging quality.
Referring to fig. 1, a virtual reality device 10 provided in this application may include a first optical system 100 in any of the above embodiments and a second optical system 200 in any of the above embodiments, where the first optical system and the second optical system are combined two by two to form 12 virtual reality devices, i.e. the virtual reality device has 12 examples. Wherein,
example 1: the virtual reality device includes the first optical system of the first embodiment and the second optical system of the fourth embodiment;
example 2: the virtual reality device includes the first optical system of the first embodiment and the second optical system of the fifth embodiment;
example 3: the virtual reality device includes the first optical system of the first embodiment and the second optical system of the sixth embodiment;
example 4: the virtual reality device includes the first optical system of the first embodiment and the second optical system of the seventh embodiment;
example 5: the virtual reality device includes the first optical system of the second embodiment and the second optical system of the fourth embodiment;
example 6: the virtual reality device includes the first optical system of the second embodiment and the second optical system of the fifth embodiment;
example 7: the virtual reality device includes the first optical system of the second embodiment and the second optical system of the sixth embodiment;
Example 8: the virtual reality device includes the first optical system of the second embodiment and the second optical system of the seventh embodiment;
example 9: the virtual reality device includes the first optical system of the third embodiment and the second optical system of the fourth embodiment;
example 10: the virtual reality device includes the first optical system of the third embodiment and the second optical system of the fifth embodiment;
example 11: the virtual reality device includes the first optical system of the third embodiment and the second optical system of the sixth embodiment; and
example 12: the virtual reality device includes the first optical system of the third embodiment and the second optical system of the seventh embodiment.
It should be understood that, as shown in fig. 1, the virtual reality device 10 provided in this 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.
In summary, table 15 shows the values of the conditional expressions of each of examples 1 to 12.
TABLE 15
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (14)

1. The virtual reality device comprises a first optical system and a second optical system, and is characterized in that,
the first optical system sequentially comprises a first element group and a second element group from a first side to a second side along a first optical axis, wherein the first element group has positive focal power and comprises a reflective polarizing element, a first lens, a quarter wave plate and a second lens; the second element group has positive optical power or negative optical power and comprises a third lens;
the second optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an image side along a second optical axis, wherein the first lens and the sixth lens have negative focal power, the second lens and the fifth lens have positive focal power, and the focal power of the third lens and the fourth lens are opposite in sign;
wherein a real image formed by the second optical system is transmitted to a display screen on the second side of the first optical system in an electric signal manner, the first optical system is used for projecting a virtual image of the display screen and the real image transmitted to the display screen, and
An on-axis distance TD 'from the first side surface of the first lens to the second side surface of the third lens, a sum Σct' of center thicknesses of each of the first lens to the third lens on the first optical axis, an on-axis distance TD from the object side surface of the first lens to the image side surface of the sixth lens, and a sum Σct of center thicknesses of each of the first lens to the sixth lens on the second optical axis satisfy: 13.5< (TD '×ΣCT')/(TD×ΣCT) <17.5.
2. The virtual reality device of claim 1, wherein a maximum field angle FOV' of the first optical system and a maximum field angle FOV of the second optical system satisfy: 16 ° < FOV-FOV' <24.2 °.
3. The virtual reality device of claim 1, wherein an effective focal length FG1 'of the first element group, an effective focal length FG2' of the second element group, a combined focal length f34 of the third lens and the fourth lens and a combined focal length f56 of the fifth lens and the sixth lens satisfy: 0< | (FG 1'/FG 2')X (f 34/f 56) | <0.6.
4. The virtual reality device of claim 1, wherein a radius of curvature R1' of the first side of the first lens, a radius of curvature R3' of the first side of the second lens, and an effective focal length FG1' of the first element group satisfy: 7.5< |r1' +r3' |/FG1' <12.5.
5. The virtual reality device according to claim 1, wherein a center thickness CT1 'of the first lens on the first optical axis, a center thickness CT2' of the second lens on the first optical axis, a center thickness CTR of the reflective polarizing element on the first optical axis, and a center thickness CTQ of the quarter wave plate on the first optical axis satisfy: 0.9< (CT 2 '+CTQ)/(CT 1' +CTR) <5.4.
6. The virtual reality device of claim 1, wherein a total effective focal length f ' of the first optical system, a maximum field angle FOV ' of the first optical system, and an on-axis distance TD ' from the first side of the first lens to the second side of the third lens satisfy: 2.3< (f ' ×tan (FOV '/2))/TD ' <2.8.
7. The virtual reality device of claim 1, wherein a radius of curvature R3 'of the first side of the second lens, a radius of curvature R4' of the second side of the second lens, a radius of curvature R5 'of the first side of the third lens, and a radius of curvature R6' of the second side of the third lens satisfy: 0.2< (R5 '+R6')/(R3 '+R4') <0.7.
8. The virtual reality device of any one of claims 1-7, wherein an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, and an effective focal length f4 of the fourth lens satisfy: 1.5< (f 1/f 2) × (f 3/f 4) <3.0.
9. The virtual reality device of any one of claims 1-7, wherein an effective focal length f5 of the fifth lens and an effective focal length f6 of the sixth lens satisfy: -0.1< (f5+f6)/(f5-f 6) <0.9.
10. The virtual reality device of any one of claims 1 to 7, wherein a radius of curvature R2 of an image side surface of the first lens, a center thickness CT1 of the first lens on the second optical axis, and an air gap T12 of the first lens and the second lens on the second optical axis satisfy: 0.8< R2/(CT1+T12) <1.4.
11. The virtual reality device of any one of claims 1-7, wherein an on-axis distance TD from an object side of the first lens to an image side of the sixth lens and a combined focal length f234 of the second lens, the third lens, and the fourth lens satisfy: 1.4< TD/f234<2.7.
12. The virtual reality device of any one of claims 1 to 7, wherein a radius of curvature R3 of an object side surface of the second lens, a radius of curvature R4 of an image side surface of the second lens, and a center thickness CT2 of the second lens on the second optical axis satisfy: 6.7< (R3-R4)/CT 2<7.7.
13. The virtual reality device of any one of claims 1 to 7, wherein a center thickness CT3 of the third lens on the second optical axis, a radius of curvature R6 of an image side of the third lens, a center thickness CT4 of the fourth lens on the second optical axis, and a radius of curvature R7 of an object side of the fourth lens satisfy: 2.3< (CT 4/CT 3) × (R7/R6) <4.7.
14. The virtual reality device of any one of claims 1 to 7, wherein a sum Σct of center thicknesses of each of the first to sixth lenses on the second optical axis, an air interval T12 of the first and second lenses on the second optical axis, and an air interval T56 of the fifth and sixth lenses on the second optical axis satisfy: 1.6< Σct/(t12+t56) <2.1.
CN202322100218.1U 2023-08-04 2023-08-04 Virtual reality device Active CN220626783U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202322100218.1U CN220626783U (en) 2023-08-04 2023-08-04 Virtual reality device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202322100218.1U CN220626783U (en) 2023-08-04 2023-08-04 Virtual reality device

Publications (1)

Publication Number Publication Date
CN220626783U true CN220626783U (en) 2024-03-19

Family

ID=90225468

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202322100218.1U Active CN220626783U (en) 2023-08-04 2023-08-04 Virtual reality device

Country Status (1)

Country Link
CN (1) CN220626783U (en)

Similar Documents

Publication Publication Date Title
CN114660783B (en) Optical lens, camera module and electronic equipment
CN220626783U (en) Virtual reality device
CN117031751A (en) Virtual reality device
CN220626781U (en) Virtual reality system
CN220626785U (en) Virtual reality device
CN220626763U (en) Optical system
CN220626780U (en) Virtual reality system
CN220357327U (en) Optical system
CN220650992U (en) Virtual reality module
CN114755810B (en) Imaging lens group, camera module and electronic equipment
CN220340488U (en) Virtual reality device
CN220709459U (en) Visual system and VR equipment comprising same
CN220626779U (en) Virtual reality system
CN220154725U (en) Optical system
CN114114624B (en) Optical lens group
CN118131488A (en) Virtual reality device
CN116859609A (en) Virtual reality system
CN116699808A (en) Visual optical system
CN118011638A (en) Virtual reality system
CN118091962A (en) Virtual reality device
CN116880072A (en) Virtual reality device
CN116880071A (en) Virtual reality device
CN117310997A (en) Optical system
CN116859607A (en) Virtual reality device
CN117950190A (en) Virtual reality device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant