CN117008343A - Optical system and VR equipment - Google Patents
Optical system and VR equipment Download PDFInfo
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- CN117008343A CN117008343A CN202311263054.2A CN202311263054A CN117008343A CN 117008343 A CN117008343 A CN 117008343A CN 202311263054 A CN202311263054 A CN 202311263054A CN 117008343 A CN117008343 A CN 117008343A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 199
- 210000001747 pupil Anatomy 0.000 claims abstract description 18
- 230000014509 gene expression Effects 0.000 claims description 19
- 230000001953 sensory effect Effects 0.000 abstract description 6
- 238000003384 imaging method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000007654 immersion Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 208000001491 myopia Diseases 0.000 description 5
- 230000004379 myopia Effects 0.000 description 5
- 206010020675 Hypermetropia Diseases 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000004305 hyperopia Effects 0.000 description 4
- 201000006318 hyperopia Diseases 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000004438 eyesight Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229920001621 AMOLED Polymers 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 230000004424 eye movement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000012771 pancakes Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0129—Head-up displays characterised by optical features comprising devices for correcting parallax
Abstract
The invention discloses an optical system and VR equipment, wherein the optical system consists of four groups with focal power, and the optical system sequentially comprises the following components from the human eye side to the display screen side: a first group having positive optical power; a second group having positive optical power; a third group having positive optical power; a fourth group having negative optical power. The optical system adopts a straight-through optical structure, and the optical power and the surface shape of thirteen lenses are reasonably matched, so that the system has the advantages of larger field angle, larger exit pupil distance, large diopter adjustment range, high light efficiency and high resolution, is carried on VR equipment for use, and can bring excellent sensory experience to users.
Description
Technical Field
The present invention relates to the field of optical lenses, and in particular, to an optical system and VR device.
Background
In recent years, with the commercial popularization of 5G, the development of VR/AR industry is continuously accelerated, and the VR/AR is widely applied to a plurality of fields such as games, social contact, education, medical treatment and the like.
With the development of Virtual Reality (VR) technology, the forms and types of VR devices are increasingly more and the application fields are also increasingly more and more extensive, and in the current VR devices, an output image is usually transmitted to human eyes after a display screen in the device is transmitted and amplified through an optical system, so that the human eyes receive a Virtual image of the amplified display screen, and the purpose of large-screen viewing is realized through the VR devices.
In order to provide a user with an excellent sensory experience, VR devices need to have a large angle of view, a large eye distance, a large eye range, and high quality imaging, while also requiring diopter adjustability in order to meet users of different myopia. At present, 2-6 folding optical systems are often adopted as an optical system carried in VR equipment, however, the current folding optical system has the defects of smaller angle of view, poor diopter adjustment, low light efficiency and the like, and cannot well meet diversified market demands.
Disclosure of Invention
Therefore, the present invention aims to provide an optical system and VR device having the advantages of large angle of view, large diopter adjustable range, high optical efficiency and high imaging quality.
The embodiment of the invention realizes the aim through the following technical scheme.
In one aspect, the present invention provides an optical system consisting of four groups having optical power, the optical system comprising, in order from a human eye side to a display screen side: a first group having positive optical power; a second group having positive optical power; a third group having positive optical power; a fourth group having negative optical power; the optical system satisfies the following conditional expression: -1<f Q1 /f<-0.1，-1.5<f Q2 /f<-0.2，-2<f Q3 /f<-0.2，1<f Q4 /f<8，-30mm<f<-15mm，85°<FOV<100°，4mm<EPD<6mm, wherein f represents the focal length of the optical system, f Q1 Representing the focal length, f, of the first group Q2 Representing the focal length, f, of the second group Q3 Representing the focal length, f, of the third group Q4 Representing the focal length of the fourth group, FOV represents the maximum field angle of the optical system, EPD represents the entrance pupil diameter of the optical system.
In another aspect, the present invention also provides a VR device, including a display screen, an optical system as described above; the display screen is used for emitting optical signals, and the optical signals comprise image information; the optical system is arranged in the light emitting direction of the display screen, and is used for modulating and transmitting the light signals sent by the display screen to human eyes.
According to the optical system and the VR equipment provided by the invention, thirteen lenses with specific focal power are adopted, and each lens is matched through specific surface shapes, so that the optical system has a larger angle of view and higher resolution, the immersion of a user is improved, and the through optical structure enables the light efficiency to be high, so that better experience is brought to the user; meanwhile, the optical system also has larger exit pupil distance and smaller distortion, and diopter adjustment from-8D to +5D can be realized by adjusting the distance between the display screen and the whole optical system, so that excellent sensory experience can be brought to a user.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural view of an optical system according to a first embodiment of the present invention;
fig. 2 is an astigmatic chart of an optical system provided by a first embodiment of the present invention;
FIG. 3 is a graph of f-tan θ distortion of an optical system provided by a first embodiment of the present invention;
fig. 4 is a schematic structural view of an optical system according to a second embodiment of the present invention;
FIG. 5 is an astigmatic diagram of an optical system according to a second embodiment of the present invention;
FIG. 6 is a graph of f-tan θ distortion of an optical system provided by a second embodiment of the present invention;
fig. 7 is a schematic structural view of an optical system according to a third embodiment of the present invention;
fig. 8 is an astigmatic chart of an optical system according to a third embodiment of the present invention;
FIG. 9 is a graph of f-tan θ distortion of an optical system provided by a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of a VR device according to a fourth embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
In this context, near the optical axis means the area near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region.
With the development of display technology, VR display technology has received extensive attention, and has been widely used in various fields such as games, social, educational and medical fields. In the aspect of VR display, most manufacturers choose to adopt a Pancake type folding light path structure in order to make VR equipment lighter and thinner, the thickness of the VR optical structure can be greatly reduced, but because the folding light path structure needs to introduce polarized light, the light has large return transmission loss after multiple times, and the light efficiency is low; and serious stray light is brought, imaging defects such as ghosting and the like are easy to form, and the watching effect of a user is influenced. Therefore, there is a need to propose an optical system with high light efficiency and high imaging quality to meet the diversified market demands.
Based on this, the present invention provides a straight-through optical system, which is applied in VR devices, and the light transmission is as follows: transmitting and amplifying an image in a display screen of the VR equipment to human eyes through the optical system, wherein a virtual image amplified by the display screen is received by the human eyes through the optical system; that is, light is emitted from the display screen, and after being transmitted through the optical system, an enlarged inverted virtual image is observed on the human eye side.
Specifically, the optical system is divided into a first group, a second group, a third group and a fourth group in sequence from the human eye side to the display screen side according to the distribution position of the lenses, wherein the first group has positive focal power, the second group has positive focal power, the third group has positive focal power and the fourth group has negative focal power. Wherein, the first group includes from the human eye side to the display screen side in proper order: a first lens, a second lens, a third lens, and a fourth lens; the second group comprises, in order from the human eye side to the display screen side: a fifth lens and a sixth lens; the third group comprises, in order from the human eye side to the display screen side: a seventh lens, an eighth lens, a ninth lens; the fourth group sequentially comprises from the human eye side to the display screen side: tenth lens, eleventh lens, twelfth lens, thirteenth lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens each comprise a mesh side surface and a display side surface, wherein the surface, close to the eye side, of each lens is the mesh side surface, and the surface, close to the display screen side, of each lens is the display side surface.
The optical system adopts a straight-through structure, light does not need to be folded back for many times in the system and transmitted along the same straight line, the optical efficiency is high, the resolution power is high, the optical system is mounted on AR equipment for use, the immersion of a user is effectively improved, and better experience can be brought to the user.
In some embodiments, the optical system satisfies the following conditional expression:
-1<f Q1 /f<-0.1；
-1.5<f Q2 /f<-0.2；
-2<f Q3 /f<-0.2；
1<f Q4 /f<8；
wherein f represents the focal length of the optical system, f Q1 Representing the firstFocal length of group, f Q2 Representing the focal length, f, of the second group Q3 Representing the focal length, f, of the third group Q4 Representing the focal length of the fourth group. The optical system has the advantages that the effective focal length duty ratio of the four groups is reasonably matched, so that the optical system has larger exit pupil distance and entrance pupil diameter, and simultaneously, a larger field angle can be provided, the optical system is carried on AR equipment for use, the immersion of a user is effectively improved, and better experience is brought to the user.
In some embodiments, the optical system satisfies the following conditional expression:
-30mm<f<-15mm；
85°<FOV<100°；
where f represents the effective focal length of the optical system and FOV represents the maximum field angle of the optical system. The optical system is applied to VR equipment, an image in a display screen is transmitted to human eyes after being transmitted and amplified by the optical system, at the moment, the human eyes receive inverted virtual images of the display screen after being amplified by the optical system, namely, the integral focal length of the optical system is negative, and therefore the human eyes realize the purpose of large-screen viewing through the VR equipment. The optical system has the effect of approaching to the field of vision of human eyes and has a larger negative focal length, so that the system has a larger field angle, and can be matched with a display screen with a larger size to realize high-definition imaging, thereby bringing better visual experience to users.
In some embodiments, the optical system satisfies the following conditional expression:
12mm<ED<15mm；
4mm<EPD<6mm；
where ED represents the exit pupil distance of the optical system and EPD represents the entrance pupil diameter of the optical system. When the optical system is used, the position of the human eye is equivalent to the diaphragm of the optical system, the above conditions are met, the pupil size (i.e. the entrance pupil diameter EPD) of the optical system is equivalent to the pupil of the human eye, and the first lens of the human eye is at a proper distance (i.e. the exit pupil distance ED) from the optical system, so that the immersion of a user can be effectively improved, and better experience is brought to the user.
In some embodiments, the optical system satisfies the following conditional expression:
1<f1/f Q1 <6；
1<f2/f Q1 <7；
1<f3/f Q1 <6；
-5<f4/f Q1 <-1；
wherein f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens. The focal length of the four lenses in the first group is reasonably distributed, so that the turning degree of light rays can be effectively increased, the system has a larger field angle, and the effect close to the field of vision of human eyes is achieved; meanwhile, the aberration of the optical system is corrected, and the imaging quality of the optical system is improved.
In some embodiments, the optical system satisfies the following conditional expression:
0.2<f1/f2<2；
-4<f3/f4<-1；
wherein f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens. The optical system has a larger visual field range and provides a larger eye movement range by reasonably matching the focal length relation of the first lens to the fourth lens.
In some embodiments, the optical system satisfies the following conditional expression:
-8<f5/f Q2 <-1；
0.2<f6/f Q2 <2；
where f5 denotes a focal length of the fifth lens, and f6 denotes a focal length of the sixth lens. The above conditions are satisfied, and the focal length of each lens in the second group is reasonably corrected, so that the distortion of the lens can be well corrected, and the lens has good resolution quality.
In some embodiments, the optical system satisfies the following conditional expression:
-4<f7/f Q3 <-0.5；
1<f8/f Q3 <5；
0.3<f9/f Q3 <3；
wherein f7 denotes a focal length of the seventh lens, f8 denotes a focal length of the eighth lens, and f9 denotes a focal length of the ninth lens. The above conditions are met, and the focal length ratio of each lens in the third group is reasonably controlled, so that the structure is more compact, and the total length of the optical system is reduced; meanwhile, the correction difficulty of system distortion can be reduced, and the imaging quality of the system is improved.
In some embodiments, the optical system satisfies the following conditional expression:
-1<f10/f Q4 <-0.05；
0.1<f11/f Q4 <2；
-1<f12/f13<-0.1；
wherein f10 denotes a focal length of the tenth lens, f11 denotes a focal length of the eleventh lens, f12 denotes a focal length of the twelfth lens, and f13 denotes a focal length of the thirteenth lens. The focal length of each lens in the fourth group can be reasonably controlled, the high-grade spherical aberration of the lens can be effectively corrected, and the relative illuminance of the lens can be improved to be at a higher level; meanwhile, the aberration of the optical system under different diopter conditions can be corrected, imaging quality can be improved, and users with different myopia or hyperopia degrees wear the optical system with better sensory experience.
As an implementation mode, the optical system adopts thirteen lenses with specific focal power, and each lens can adopt the following surface shape collocation of different combinations, so that the optical system has a better imaging effect.
The first lens has positive focal power, the object side surface of the first lens is concave or convex, and the display side surface of the first lens is convex.
The second lens has positive focal power, the object side surface is a convex surface, and the display side surface is a concave surface or a convex surface.
The third lens has positive focal power, the object side surface is a convex surface, and the display side surface is a concave surface.
The fourth lens has negative focal power, the object side surface is a concave surface, and the display side surface is a concave surface.
The fifth lens has negative focal power, the object side surface is concave, and the display side surface is convex.
The sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, and the display side surface of the sixth lens is a convex surface.
The seventh lens has negative focal power, the object side surface is concave, and the display side surface is convex.
The eighth lens has positive focal power, the object side surface is concave, and the display side surface is convex.
The ninth lens has positive focal power, the object side surface of the ninth lens is a convex surface, the display side surface of the ninth lens is a concave surface, or the object side surface of the ninth lens is a concave surface and the display side surface of the ninth lens is a convex surface.
The tenth lens has positive focal power, the object side surface of the tenth lens is a convex surface, and the display side surface of the tenth lens is a convex surface.
The eleventh lens has negative focal power, the object side surface of the eleventh lens is concave, the tenth lens and the eleventh lens form a bonding lens, and the display side surface of the tenth lens and the object side surface of the eleventh lens form a bonding surface.
One of the twelfth lens and the thirteenth lens has positive optical power, and the other lens has negative optical power; the display side surface in the thirteenth lens is convex.
As an embodiment, each lens in the optical system may employ a spherical lens or an aspherical lens, and alternatively, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the tenth lens, and the eleventh lens may each employ a spherical lens, and the eighth lens, the ninth lens, the twelfth lens, and the thirteenth lens may each employ an aspherical lens; in other embodiments, thirteen lenses in the optical system may each be spherical lenses, which is not limited herein.
In this example, as one embodiment, when the lens surface in the optical system is an aspherical lens, the aspherical surface type satisfies the following equation:
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h in the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient conic, A 2i The aspherical surface profile coefficient of the 2 i-th order.
The invention is further illustrated in the following examples. In the following embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical system are different, and the specific differences can be seen from the parameter table of each embodiment. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical system 100 according to a first embodiment of the present invention is shown, wherein the optical system 100 is composed of thirteen lenses, and is sequentially divided into a first group Q1, a second group Q2, a third group Q3 and a fourth group Q4 from a human eye side to a display screen side S28 according to distribution positions of the lenses; wherein the first group Q1, the second group Q2, and the third group Q3 have positive power, and the fourth group Q4 has negative power. The entrance pupil position on the human eye side is the stop ST of the optical system 100.
The first group Q1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in order from the human eye side to the display screen side S28 along the optical axis.
The first lens L1 has positive optical power, and its object side S1 is convex, and its display side S2 is convex.
The second lens L2 has positive power, the object side surface S3 thereof is convex, and the display side surface S4 thereof is concave.
The third lens L3 has positive power, the object side surface S5 thereof is convex, and the display side surface S6 thereof is concave.
The fourth lens L4 has negative optical power, the object side surface S7 thereof is concave, and the display side surface S8 thereof is concave.
The second group Q2 sequentially includes, along the optical axis from the human eye side to the display screen side S28: a fifth lens L5 and a sixth lens L6.
The fifth lens L5 has negative refractive power, the object-side surface S9 thereof is concave, and the display-side surface S10 thereof is convex.
The sixth lens L6 has positive optical power, the object side surface S11 thereof being convex, and the display side surface S12 thereof being convex.
The third group Q3 sequentially includes, along the optical axis from the human eye side to the display screen side S28: a seventh lens L7, an eighth lens L8, and a ninth lens L9.
The seventh lens L7 has negative power, the object side surface S13 is concave, and the display side surface S14 is convex.
The eighth lens L8 has positive optical power, the object side surface S15 thereof being concave, and the display side surface S16 thereof being convex.
The ninth lens L9 has positive optical power, the object side surface S17 thereof being concave, and the display side surface S18 thereof being convex.
The fourth group Q4 sequentially includes, along the optical axis from the human eye side to the display screen side S28: tenth lens L10, eleventh lens L11, twelfth lens L12, thirteenth lens L13.
The tenth lens L10 has positive power, and its object side S19 is convex, and its display side is convex.
The eleventh lens L11 has negative power, a concave object-side surface thereof, and a convex display-side surface S21 thereof; and the tenth lens L10 and the eleventh lens L11 constitute a cemented lens, and the display side surface of the tenth lens and the mesh side surface of the eleventh lens constitute a cemented surface S20.
The twelfth lens L12 has negative optical power, the object side S22 of which is concave, and the display side S23 of which is concave.
The thirteenth lens L13 has positive power, its object side S24 being convex, and its display side S25 being convex.
The eye side surface S26 of the cover glass G1 is a plane, and the display side surface S27 is a plane.
When the optical system 100 provided by the invention is mounted on VR equipment, diopter adjustment from-8D (diopter D, a unit representing the refractive power) to +5D can be realized by adjusting the positions of the display screen and the whole optical system 100 on the optical axis, and the optical system has higher imaging quality under different diopters, so that the wearing requirements of users with different myopia or hyperopia degrees can be met.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the tenth lens L10 and the eleventh lens L11 may all adopt glass spherical lenses, and the eighth lens L8, the ninth lens L9, the twelfth lens L12 and the thirteenth lens L13 may all adopt glass aspherical lenses, and by adopting reasonable collocation of glass spherical and aspherical lenses, the system can have better imaging quality.
The relevant parameters of each lens in the optical system 100 according to the first embodiment of the present invention are shown in table 1.
TABLE 1
The surface profile coefficients of the aspherical surfaces of the optical system 100 provided in the first embodiment of the present invention are shown in table 2.
TABLE 2
Referring to fig. 2, an astigmatic chart of the optical system 100 is shown, in which the horizontal axis represents the amount of offset (in mm) and the vertical axis represents the angle of view (in degrees). As can be seen from fig. 2, the meridional field curvature and the sagittal field curvature of different wavelengths are within ±0.4mm, indicating that the astigmatism of the optical system 100 is well corrected.
Referring to FIG. 3, an f-tan θ distortion graph of an optical system 100 is shown, wherein the horizontal axis represents the distortion percentage and the vertical axis represents the angle of view (in degrees). As can be seen from fig. 3, the f-tan θ distortion at different image heights on the imaging plane is controlled within-15% and negative, indicating that the distortion of the optical system 100 is well corrected.
Second embodiment
Referring to fig. 4, a schematic diagram of an optical system 200 according to a second embodiment of the present invention is shown, and the optical system 200 according to the second embodiment of the present invention has substantially the same structure as the optical system 100 according to the first embodiment, except that the radius of curvature, thickness, and material selection of each lens are different.
Referring to table 3, the parameters of each lens in the optical system 200 according to the second embodiment of the invention are shown.
TABLE 3 Table 3
Referring to table 4, the surface coefficients of each aspheric surface of the optical system 200 according to the second embodiment of the present invention are shown.
TABLE 4 Table 4
Referring to fig. 5, an astigmatic chart of the optical system 200 is shown, and as can be seen from fig. 5, both the meridional field curvature and the sagittal field curvature of different wavelengths are within ±0.65mm, which indicates that the astigmatic effect of the optical system 200 is well corrected.
Referring to fig. 6, a graph of f-tan θ distortion of the optical system 200 is shown, and as can be seen from fig. 6, f-tan θ distortion at different image heights on the imaging plane is controlled within-15% and is negative, which indicates that the distortion of the optical system 200 is well corrected.
Third embodiment
Referring to fig. 7, a schematic diagram of an optical system 300 according to a third embodiment of the present invention is shown, and the optical system 300 according to the third embodiment of the present invention has substantially the same structure as the optical system 100 according to the first embodiment, except that: the eye side surface S1 of the first lens is a concave surface; the display screen side S4 of the second lens is a convex surface; the eye side surface S17 of the ninth lens is a convex surface, and the side surface S18 of the display screen is a concave surface; the twelfth lens L12 has positive focal power, the mesh side surface S22 of the twelfth lens is a convex surface, and the display screen side surface S23 is a convex surface; the thirteenth lens L13 has negative focal power, and the eye side surface S24 of the thirteenth lens is a concave surface; and the radius of curvature and the material selection of the lenses are different.
Referring to table 5, the parameters of each lens in the optical system 300 according to the third embodiment of the invention are shown.
TABLE 5
Referring to fig. 8, an astigmatic chart of the optical system 300 is shown, and as can be seen from fig. 8, both the meridional field curvature and the sagittal field curvature of different wavelengths are within ±0.65mm, which indicates that the astigmatic effect of the optical system 300 is well corrected.
Referring to fig. 9, a graph of f-tan θ distortion of the optical system 300 is shown, and as can be seen from fig. 9, f-tan θ distortion at different image heights on the imaging plane is controlled within-15% and is negative, which indicates that the distortion of the optical system 300 is well corrected.
Referring to table 6, the optical characteristics of the optical systems provided by the above three embodiments mainly include a maximum field angle FOV, a focal length f, an exit pupil distance ED, an entrance pupil diameter EPD, an optical total length TTL (representing a distance from a mesh side surface of the first lens to the display screen), an image height IH (representing a radius of a circle of a display area of the display screen), and the like, and the related values corresponding to each of the foregoing conditional expressions.
TABLE 6
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In summary, the optical system provided by the invention has the following advantages:
(1) Thirteen lenses with specific focal power are adopted, and the lenses are matched through specific surface shapes, so that the optical system has smaller optical distortion and higher resolution (can be matched with a 4K display screen), and the imaging quality of VR equipment is improved.
(2) And the folding light path structure commonly adopted in the market adopts a thirteen-piece straight-through optical structure, so that the invention has high light efficiency and higher resolution, is mounted on AR equipment for use, effectively improves the immersion of a user, and can bring better experience to the user.
(3) According to the invention, the positions of the display screen and the whole optical system on the optical axis are adjusted, so that the diopter adjustment (-8D to +5D) in a larger range can be realized, the imaging quality is higher under different diopters, the wearing requirements of users with different myopia or hyperopia degrees can be met, meanwhile, the display screen has a larger angle of view (the FOV can reach more than 90 degrees) and a larger exit pupil distance (the ED can reach more than 13 mm), and better experience can be provided for the users.
Fourth embodiment
As shown in fig. 10, a schematic structural diagram of a VR device 400 according to a fourth embodiment of the present invention is provided, where the VR device 400 includes a display 10 and an optical system (e.g., the optical system 100) in any of the above embodiments.
The display screen 10 is configured to emit an optical signal including image information. Preferably, the display 10 may be one of Micro LED and OLED, LCD, LCOS, M-OLED, and in this embodiment, the display 10 may be a 4K AM-OLED display, which can provide high-definition image information for the optical system 100.
The optical system 100 is located between the user's eye 20 and the display screen 10, the optical system 100 is disposed in the light emitting direction of the display screen 10, and the thirteenth lens L13 is disposed closer to the display screen 10 than the first lens L1, and the optical system 100 is configured to modulate and transmit the light signal emitted by the display screen 10 to the human eye.
In summary, in the VR device 400, the light transmission direction of the optical system is: light is transmitted from the display screen side to the human eye side (the light path transmission is shown as a solid line OX in the figure), the image information emitted from the display screen 10 enters the eyes 20 of the user to be imaged through the optical system 100, and a high-definition amplified virtual image can be observed in the eyes of the user, so that the high-definition amplified virtual image has a very realistic sensory experience.
The VR device 400 provided in this embodiment includes an optical system, and since the optical system has the advantages of large exit pupil distance, large angle of view, high optical efficiency, high resolution, and adjustable diopter, the VR device 400 with the optical system also has the advantages of large angle of view, high optical efficiency, high resolution, and adjustable diopter, so that users with different myopia or hyperopia degrees wear the device with good sensory experience.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (10)
1. An optical system consisting of four groups having optical power, characterized in that the optical system comprises, in order from the human eye side to the display screen side:
a first group having positive optical power;
a second group having positive optical power;
a third group having positive optical power;
a fourth group having negative optical power;
the optical system satisfies the following conditional expression:
-1<f Q1 /f<-0.1；
-1.5<f Q2 /f<-0.2；
-2<f Q3 /f<-0.2；
1<f Q4 /f<8；
-30mm<f<-15mm；
85°<FOV<100°；
4mm<EPD<6mm；
wherein f represents the focal length of the optical system, f Q1 Representing the focal length, f, of the first group Q2 Representing the focal length, f, of the second group Q3 Representing the focal length, f, of the third group Q4 Representing the focal length of the fourth group, FOV represents the maximum field angle of the optical system, EPD represents the entrance pupil diameter of the optical system.
2. The optical system of claim 1, wherein the optical system satisfies the following conditional expression:
12mm<ED<15mm；
where ED represents the exit pupil distance of the optical system.
3. The optical system of claim 1, wherein the first group comprises, in order from the human eye side to the display screen side: the first lens, the second lens, the third lens and the fourth lens, and the optical system satisfies the following conditional expression:
1<f1/f Q1 <6；
1<f2/f Q1 <7；
wherein f1 represents the focal length of the first lens, and f2 represents the focal length of the second lens.
4. An optical system according to claim 3, wherein the optical system satisfies the following conditional expression:
1<f3/f Q1 <6；
-5<f4/f Q1 <-1；
wherein f3 represents a focal length of the third lens, and f4 represents a focal length of the fourth lens.
5. An optical system according to claim 3, wherein the optical system satisfies the following conditional expression:
0.2<f1/f2<2；
-4<f3/f4<-1；
wherein f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens.
6. The optical system of claim 1, wherein the second group comprises, in order from the human eye side to the display screen side: a fifth lens and a sixth lens; the optical system satisfies the following conditional expression:
-8<f5/f Q2 <-1；
0.2<f6/f Q2 <2；
where f5 denotes a focal length of the fifth lens, and f6 denotes a focal length of the sixth lens.
7. The optical system of claim 1, wherein the third group comprises, in order from the human eye side to the display screen side: a seventh lens, an eighth lens, a ninth lens; the optical system satisfies the following conditional expression:
-4<f7/f Q3 <-0.5；
1<f8/f Q3 <5；
0.3<f9/f Q3 <3；
wherein f7 denotes a focal length of the seventh lens, f8 denotes a focal length of the eighth lens, and f9 denotes a focal length of the ninth lens.
8. The optical system of claim 1, wherein the fourth group comprises, in order from the human eye side to the display screen side: a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens; the optical system satisfies the following conditional expression:
-1<f10/f Q4 <-0.05；
0.1<f11/f Q4 <2；
wherein f10 denotes a focal length of the tenth lens, and f11 denotes a focal length of the eleventh lens.
9. The optical system of claim 8, wherein the optical system satisfies the following conditional expression:
-1<f12/f13<-0.1；
where f12 denotes a focal length of the twelfth lens, and f13 denotes a focal length of the thirteenth lens.
10. A VR device comprising:
the display screen is used for emitting optical signals, and the optical signals comprise image information;
the optical system according to any one of claims 1-9, wherein the optical system is disposed in a light emitting direction of the display screen, and the optical system is configured to modulate an optical signal emitted by the display screen and transmit the modulated optical signal to a human eye.
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Cited By (1)
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| CN117310998A (en) * | 2023-11-29 | 2023-12-29 | 江西联昊光电有限公司 | Optical system and near-eye display device |
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| CN117008343B (en) | 2024-01-05 |
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