CN116540397A - Visual system and VR equipment comprising same - Google Patents
Visual system and VR equipment comprising same Download PDFInfo
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- CN116540397A CN116540397A CN202310588661.XA CN202310588661A CN116540397A CN 116540397 A CN116540397 A CN 116540397A CN 202310588661 A CN202310588661 A CN 202310588661A CN 116540397 A CN116540397 A CN 116540397A
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- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
-
- 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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- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The application discloses a visual system, which comprises a lens barrel, a first lens group, a second lens group and a third lens group, wherein the first lens group, the second lens group and the third lens group are assembled in the lens barrel and are sequentially arranged from a first side to a second side along an optical axis, and the first lens group comprises a first lens, a reflective polarizing element and a quarter wave plate; the second lens group comprises a second lens with positive or negative focal power, and the second side surface of the second lens group is a concave surface; the third lens group includes a third lens having positive optical power; the center thickness of the first lens on the optical axis is smaller than that of the second lens on the optical axis; the second side of the second lens has a second spacer element in contact with the second side portion of the second lens. The radius of curvature R3 of the first side of the second lens, the thickness CP2 of the second spacer element in a direction parallel to the optical axis and the inner diameter d2m of the second side of the second spacer element satisfy-20 mm < R3×CP2/d2m <0mm; the maximum field angle FOV of the visual system, the effective focal length f3 of the third lens, and the maximum height L of the lens barrel in the optical axis direction satisfy 0< tan (FOV/4) ×f3/L <13.
Description
Technical Field
The present application relates to the field of optical elements, and more particularly, to a vision system and VR device including the same.
Background
In recent years, the metauniverse industry is continuously updated, and Virtual Reality (VR) technology is rapidly developed. The virtual reality technology is a technology for simulating a real scene and providing a high immersion feeling through computer graphics, sounds and other sensory inputs, and has a great application prospect in the fields of entertainment, education training, artistic culture, teleoffice collaboration, medical treatment and the like.
Among other things, the resolution of VR devices is an important factor affecting the user's immersion. However, in the practical design process of the optical system of the VR device, there may be irrational issues of the end face opening and the angle of view of the optical system, and these irrational issues may result in the optical system having poor resolution, and thus may result in poor immersion feeling for the user using the optical system.
Accordingly, in view of the above problems, those skilled in the art have focused their efforts on optimizing the design of the relevant parameters and structural forms of the various optical components, such as lenses, spacer elements, and lens barrels, etc., constituting the system to provide a visual optical system, so that the visual field of the visual optical system can be ensured to a reasonable extent to improve the resolution of the system, and at the same time, the optical system can have better image quality and enhance the immersive experience of the user.
Disclosure of Invention
The application provides a visual system, which can comprise a lens barrel, a first lens group, a second lens group and a third lens group, wherein the first lens group, the second lens group and the third lens group are assembled in the lens barrel and are sequentially arranged from a first side to a second side along an optical axis, and the first lens group comprises a first lens, a reflective polarizing element and a quarter wave plate; the second lens group comprises a second lens with positive focal power or negative focal power, and the second side surface of the second lens group is a concave surface; the third lens group includes a third lens having positive optical power; the center thickness of the first lens on the optical axis is smaller than the center thickness of the second lens on the optical axis; the vision system also includes a second spacer element positioned on a second side of the second lens and in contact with a second side portion of the second lens. The radius of curvature R3 of the first side of the second lens, the thickness CP2 of the second spacer element in a direction parallel to the optical axis, and the inner diameter d2m of the second side of the second spacer element may satisfy-20 mm < R3×CP2/d2m <0mm. The maximum field angle FOV of the visual system, the effective focal length f3 of the third lens, and the maximum height L of the barrel in the optical axis direction may satisfy 0< tan (FOV/4) ×f3/L <13.
In one embodiment, a sum Σct of an outer diameter D0m of the second side end surface of the lens barrel, an effective focal length f of the visual system, and center thicknesses of the first lens, the second lens, and the third lens on the optical axis, respectively, may satisfy: 4< D0 m/Lxf/ΣCT <15.
In one embodiment, the radius of curvature R6 of the second side surface of the third lens, the inner diameter d0m of the second side end surface of the lens barrel, and the entrance pupil diameter EPD of the visual system may satisfy: 12mm < R6/d0 mXEPD <0mm.
In one embodiment, the first side surface of the first lens is convex, and the radius of curvature R1 of the first side surface of the first lens, the inner diameter d0m of the second side end surface of the lens barrel, and the inner diameter d0s of the first side end surface of the lens barrel may satisfy: 0< R1/(d0m+d0s) <88.
In one embodiment, the abbe number Vr of the reflective polarizing element, the abbe number Vp of the quarter wave plate, the abbe number V2 of the second lens, the outer diameter D2s of the first side of the second spacer element, and the inner diameter D2s of the first side of the second spacer element may satisfy: 1< (Vr+Vp)/V2 XD 2s/D2s <4.
In one embodiment, the refractive index Nr of the reflective polarizing element, the refractive index Np of the quarter wave plate, the outer diameter D0s of the first side end surface of the lens barrel, and the effective focal length f of the visual system may satisfy: 4< (Nr+Np). Times.D0s/f < 10.
In one embodiment, the effective focal length f2 of the second lens and the outer diameter D2s of the first side of the second spacer element may satisfy: 0mm < |f2|/(D2s+d2m) ×CP2<8mm.
In one embodiment, the radius of curvature R4 of the second side of the second lens, the inner diameter d2s of the first side of the second spacer element, the radius of curvature R5 of the first side of the third lens, and the center thickness CT2 of the second lens on the optical axis may satisfy: 10mm < |R4/d2s+R5/d2m|XCT 2<41mm.
In one embodiment, the radius of curvature of the first side surface and the second side surface of the reflective polarizing element are the same, and the radius of curvature RRP1 of the first side surface and the inner diameter d0m of the second side end surface of the lens barrel of the reflective polarizing element may satisfy: 0< |R3/RRP1|× (d 0m-d2 m) <30.
In one embodiment, an outer diameter D0m of the second side end surface of the lens barrel, a distance TD between the first side surface of the first lens and the second side surface of the third lens on the optical axis, a center thickness dr of the reflective polarizing element on the optical axis, and a center thickness dp of the quarter wave plate on the optical axis may satisfy: 1< D0 m/(TD+dr+dp) <5.
In one embodiment, the visual system further comprises a first spacer element located on the second side of the first lens and in contact with the second side portion of the first lens; the effective focal length F1 of the first lens group, the radius of curvature R2 of the second side surface of the first lens, the outer diameter D1m of the second side surface of the first spacer element, the inner diameter D1s of the first side surface of the first spacer element, and the thickness CP1 of the first spacer element in a direction parallel to the optical axis may satisfy: -40< (F1/R2) × (D1 m-D1 s)/CP 1<0.
In one embodiment, the visual system further comprises a first spacer element located on the second side of the first lens and in contact with the second side portion of the first lens; the refractive index N1 of the first lens, the thickness CP1 of the first spacer element in a direction parallel to the optical axis, the refractive index N3 of the third lens, and the pitch EP12 of the first spacer element and the second spacer element on the optical axis may satisfy: 0< (N1×CP1+N3×CP2)/EP 12<4.
In one embodiment, the quarter wave plate is attached to the reflective polarizing element, and the reflective polarizing element is attached to the second side of the first lens.
In one embodiment, each of the first to third lenses has at least one aspherical surface.
In one embodiment, the visual system further comprises a pressing ring structure positioned on the first side of the lens barrel and matched with the lens barrel through a threaded structure or a concave-convex embedded structure.
In one embodiment, the lens barrel has a protruding portion at a position inside the lens barrel near the first side, the first lens is located at the first side of the protruding portion, the second side of the first lens is in contact with the first side of the protruding portion, and the first side of the first lens is in contact with the second side of the press ring structure; the second lens is located at a second side of the protruding portion, and a first side of the second lens is in contact with a second side of the protruding portion.
In another aspect, the present application further provides a VR device, where the VR device includes a visual system provided in at least one of the foregoing embodiments, and the first side is a human eye side and the second side is a display side.
The visual system comprises a first lens group, a second lens group and a third lens group which are assembled in a lens barrel and are sequentially arranged from a first side to a second side along an optical axis, wherein the first lens group comprises a first lens, a reflective polarizing element and a quarter wave plate; the second lens group comprises a second lens with positive focal power or negative focal power, and the second side surface of the second lens group is a concave surface; the third lens group includes a third lens having positive optical power; and the center thickness of the first lens on the optical axis is smaller than the center thickness of the second lens on the optical axis; and the visual system further comprises a second spacer element positioned on a second side of the second lens and in contact with a second side portion of the second lens; meanwhile, controlling the curvature radius R3 of the first side surface of the second lens, the thickness CP2 of the second spacing element along the direction parallel to the optical axis and the inner diameter d2m of the second side surface of the second spacing element to satisfy the condition-20 < R3×CP2/d2m <0; the maximum field angle FOV of the visual system, the effective focal length f3 of the third lens, and the maximum height L of the lens barrel in the optical axis direction satisfy the condition 0< tan (FOV/4) ×f3/L <13. This kind of setting of visual system that this application disclosed can guarantee that marginal light passes through, guarantees the realization of the half angle of view Semi-FOV of maximum, can also guarantee that the light that the system pupil sent is last to be imaged on the display to can guarantee second interval element mould shaping processing needs, simultaneously, also can produce positive influence to the distortion and the astigmatic size of whole system, and then can make the system satisfy the requirement of definition and color reproducibility better.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 illustrates a schematic view of the structure and some parameters of a visual system according to an exemplary embodiment of the present application;
FIGS. 2, 3 and 4 show schematic structural views of a visual system according to example 1 of the present application in three embodiments, respectively;
FIGS. 5, 6 and 7 show on-axis chromatic aberration curves, astigmatism curves and distortion curves, respectively, for the visual system of example 1;
FIGS. 8, 9 and 10 show schematic structural views of a visual system according to example 2 of the present application in three embodiments, respectively;
FIGS. 11, 12 and 13 show on-axis chromatic aberration curves, astigmatism curves and distortion curves, respectively, for the visual system of example 2;
FIGS. 14, 15 and 16 show schematic structural views of a visual system according to example 3 of the present application in three embodiments, respectively;
FIGS. 17, 18 and 19 show on-axis chromatic aberration curves, astigmatism curves and distortion curves, respectively, for the visual system of example 3;
FIG. 20 illustrates a propagation path diagram of light rays through a vision system of an exemplary embodiment of the present application; and
Fig. 21 is an enlarged view of a portion of a propagation path diagram of the light rays shown in fig. 20 through a visual system according to an exemplary embodiment of the present application.
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. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
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 have been slightly exaggerated for convenience of explanation. In particular, 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 surface is convex and the convex position is not defined, then 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.
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 a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. 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 following examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. 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.
The visual system according to an exemplary embodiment of the present application may include a lens barrel, and a first lens group, a second lens group, and a third lens group, which are assembled in the lens barrel, sequentially arranged from a first side to a second side along an optical axis.
In an exemplary embodiment, the first lens group may include at least a first lens, a reflective polarizing element, and a quarter wave plate. The second lens group may include at least a second lens. The third lens group may include at least a third lens.
In an exemplary embodiment, the second lens may have positive or negative optical power, and the second side of the second lens may be concave. The third lens may have positive optical power.
In an exemplary embodiment, the center thickness of the first lens on the optical axis may be smaller than the center thickness of the second lens on the optical axis.
In an exemplary embodiment, the visual system may include a second spacer element located on a second side of the second lens, and the second spacer element may be in contact with a second side portion of the second lens.
In an exemplary embodiment, the visual system may further include a first spacer element located on the second side of the first lens, and the first spacer element may be in contact with the second side portion of the first lens. Wherein, it is understood that the surface of each element in the visual system that is closer to the first side and farther from the second side is the first side of the element; the surface of each element that is closer to the second side and farther from the first side is the second side of the element.
In an exemplary embodiment, the first side may be, for example, a human eye side, and the second side may be, for example, a display side. The visual system may be used, for example, in a variety of VR display devices.
In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression-20 mm < r3×cp2/d2m <0mm, where R3 is a radius of curvature of the first side of the second lens, CP2 is a thickness of the second spacer element in a direction parallel to the optical axis, and d2m is an inner diameter of the second side of the second spacer element. By controlling the radius of curvature of the first side of the second lens, the thickness of the second spacing element along the direction parallel to the optical axis and the inner diameter of the second side of the second spacing element to meet the condition-20 mm < R3×CP2/d2m <0mm, marginal light can be ensured to pass through, the realization of the maximum half field angle Semi-FOV is ensured, the final imaging of the light emitted by the pupils of the system on a display is ensured, the distortion and astigmatism of the whole system are controlled, and the system meets the requirements of definition and color reduction.
In an exemplary embodiment, the vision system of the present application may satisfy a conditional expression of 0< tan (FOV/4) ×f3/L <13, where FOV is a maximum field angle of the vision system, f3 is an effective focal length of the third lens, and L is a maximum height of the lens barrel in the optical axis direction. The maximum field angle of the visual system, the effective focal length of the third lens and the maximum height of the lens barrel along the optical axis direction are controlled to meet the condition 0< tan (FOV/4) multiplied by f3/L <13, so that edge light passing is guaranteed, the realization of the maximum half field angle Semi-FOV is guaranteed, the light emitted by the pupil of the system can be finally imaged on a display, the molding processing requirement of a second interval element mold is guaranteed, meanwhile, distortion of the whole system and control of astigmatism are facilitated, and the system meets the requirements of definition and color reduction.
In an exemplary embodiment, the vision system of the present application may satisfy the condition 4< dym/lxf/Σct <15, where D0m is an outer diameter of a second side end surface of the lens barrel (i.e., an end surface or surface of the lens barrel closest to the second side), L is a maximum height of the lens barrel in the optical axis direction, f is an effective focal length of the vision system, Σct is a sum of center thicknesses of the first lens, the second lens, and the third lens, respectively, on the optical axis. The total sum of the outer diameter of the second side end surface of the lens barrel, the maximum height of the lens barrel along the optical axis direction, the effective focal length of the visual system and the central thicknesses of the first lens, the second lens and the third lens on the optical axis respectively meets the condition 4< D0 m/Lxf/ΣCT <15, so that the height of the lens and the height of the lens barrel can be controlled simultaneously, on one hand, the height size of the lens barrel can be made to be as small as possible, and the size of the whole lens can be reduced; on the other hand, the lens barrel height and the lens height can be maintained in a certain proportion, and the uniform wall thickness of the lens barrel is favorable for forming stability and the reliability requirement of the whole system.
In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression-12 mm < R6/d0m×epd <0mm, where R6 is a radius of curvature of the second side surface of the third lens, d0m is an inner diameter of the second side end surface of the lens barrel, and EPD is an entrance pupil diameter of the vision system. The curvature radius of the second side surface of the third lens, the inner diameter of the second side end surface of the lens barrel and the entrance pupil diameter of the visual system are controlled to meet the condition that 12mm is less than R6/d0m multiplied by EPD is less than 0mm, so that the system can meet the size of an eye box of an ergonomic human eye, and immersion experience of a VR lens is facilitated; can ensure that all source light on the display can be received; the external dimension of the lens barrel can be determined, which is beneficial to miniaturization, thinness and thinness; meanwhile, the deflection of light rays to the display can be limited, and the system performance is guaranteed.
In an exemplary embodiment, the first side of the first lens may be convex. The visual system of the present application may satisfy the condition 0< R1/(d0m+d0s) <88, where R1 is a radius of curvature of the first side surface of the first lens, d0m is an inner diameter of the second side end surface of the barrel, and d0s is an inner diameter of the first side end surface of the barrel (i.e., an end surface or surface of the barrel closest to the first side). By controlling the radius of curvature of the first side surface of the first lens, the inner diameter of the second side end surface of the lens barrel and the inner diameter of the first side end surface of the lens barrel to satisfy the condition 0< R1/(d0m+d0s) <88, the bending degree of light can be ensured, and the required light deflection occurs on the first side surface of the first lens, so that the incident light is ensured to be within the human eye entrance pupil range; meanwhile, the effective incidence of light can be ensured.
In an exemplary embodiment, the vision system of the present application may satisfy the condition 1< (vr+vp)/v2×d2s/D2s <4, where Vr is the dispersion coefficient of the reflective polarizing element, vp is the dispersion coefficient of the quarter wave plate, V2 is the dispersion coefficient of the second lens, D2s is the outer diameter of the first side of the second spacer element, and D2s is the inner diameter of the first side of the second spacer element. The chromatic aberration on the axis can be effectively reduced by controlling the chromatic aberration coefficient of the reflective polarizing element, the chromatic aberration coefficient of the quarter wave plate, the chromatic aberration coefficient of the second lens, the outer diameter of the first side surface of the second spacing element and the inner diameter of the first side surface of the second spacing element to satisfy the condition 1< (Vr+Vp)/V2 xD 2s/D2s <4, thereby being beneficial to clear imaging of the whole visual system and ensuring the color reduction effect of the whole visual system; and, can guarantee the lens assemblage stability and air interval needs.
In an exemplary embodiment, the visual system of the present application may satisfy the conditional expression 4< (nr+np) ×d0s/f <10, where Nr is the refractive index of the reflective polarizing element, np is the refractive index of the quarter wave plate, D0s is the outer diameter of the first side end surface of the lens barrel, and f is the effective focal length of the visual system. The refractive index of the reflective polarizing element, the refractive index of the quarter wave plate, the outer diameter of the first side end surface of the lens barrel and the effective focal length of the visual system are controlled to meet the condition that 4< (Nr+Np) x D0s/f <10, the view angle of the system can be effectively restrained, and therefore the system meets the characteristic of a large view field of a VR lens; in addition, the structural compactness of the whole visual system can be ensured; the whole visual field can be effectively observed by human eyes, and the influence of adverse light rays can be blocked; meanwhile, the refractive indexes of the polarizing element and the quarter wave plate are reasonably set, so that the refractive index of the polarizing element and the quarter wave plate can be ensured to be close or similar to that of the lens, and the stray light phenomenon is avoided.
In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression 0mm < |f2|/(d2s+d2m) ×cp2<8mm, where f2 is an effective focal length of the second lens, D2s is an outer diameter of the first side of the second spacer element, D2m is an inner diameter of the second side of the second spacer element, and CP2 is a thickness of the second spacer element in a direction parallel to the optical axis. The effective focal length of the second lens, the outer diameter of the first side surface of the second spacing element, the inner diameter of the second side surface of the second spacing element and the thickness of the second spacing element along the direction parallel to the optical axis are controlled to meet the condition that 0mm < |f2|/(D2s+d2m) multiplied by CP2<8mm, so that the second lens can be used as a relay transition lens of the first lens and the third lens, the focal length of the whole visual system is reasonably influenced, and the compact structure can be ensured; the second interval element mold forming processing requirement can be ensured, meanwhile, the distortion and the astigmatic magnitude of the whole system can be reasonably controlled, and the system is favorable for meeting the requirements of definition and color reproducibility.
In an exemplary embodiment, the vision system of the present application may satisfy the conditional expression 10mm < |r4/d2s+r5/d2m|×ct2<41mm, where R4 is a radius of curvature of the second side of the second lens, d2s is an inner diameter of the first side of the second spacer element, R5 is a radius of curvature of the first side of the third lens, d2m is an inner diameter of the second side of the second spacer element, and CT2 is a center thickness of the second lens on the optical axis. The curvature radius of the second side surface of the second lens, the inner diameter of the first side surface of the second spacing element, the curvature radius of the first side surface of the third lens, the inner diameter of the second side surface of the second spacing element and the central thickness of the second lens on the optical axis are controlled to meet the condition that 10mm < -R4/d2s+R5/d2m|XCT 2 is less than 41mm, so that the reasonable control of the focal power of the lens is facilitated, and the aberration correction of the VR lens such as field curvature and astigmatism is facilitated; meanwhile, the second lens can be ensured to have a certain thickness, so that the thickness from the center to the edge of the lens is uniform, and the stability of the molding surface type is ensured.
In an exemplary embodiment, the radius of curvature of the first side of the reflective polarizing element may be the same as the radius of curvature of the second side thereof. The visual system of the present application may satisfy the condition 0< |r3/rrp1|× (d 0m-d2 m) <30, where R3 is a radius of curvature of the first side of the second lens, RRP1 is a radius of curvature of the first side of the reflective polarizing element, d0m is an inner diameter of the second side end surface of the lens barrel, and d2m is an inner diameter of the second side of the second spacer element. By controlling the radius of curvature of the first side of the second lens, the radius of curvature of the first side of the reflective polarizing element, the inner diameter of the second side end surface of the barrel, and the inner diameter of the second side of the second spacer element to satisfy the condition 0< |r3/rrp1|× (d 0m-d2 m) <30, it is possible to ensure that the thickness of the polarizing element from the center to the edge remains uniform, it is possible to ensure that wrinkles and warpage do not occur during the bonding with the lens surface, and it is advantageous to ensure that linearly polarized light vibrates only in one direction.
In an exemplary embodiment, the visual system of the present application may satisfy the condition 1< dym/(td+dr+dp) <5, where D0m is an outer diameter of the second side end surface of the lens barrel, TD is a distance on the optical axis between the first side surface of the first lens and the second side surface of the third lens, dr is a center thickness of the reflective polarizing element on the optical axis, and dp is a center thickness of the quarter wave plate on the optical axis. By controlling the outer diameter of the second side end face of the lens barrel, the distance between the first side face of the first lens and the second side face of the third lens on the optical axis, the central thickness of the reflective polarizing element on the optical axis and the central thickness of the quarter wave plate on the optical axis to meet the condition 1< D0 m/(TD+dr+dp) <5, the wall thickness of the rear end (close to the second side end) of the lens barrel can be reasonably controlled, and the size matching with the display of the rear end can be ensured; and the optical path after the refraction of the folding system can be reasonably controlled, so that the refractive optical path is not too large, and the distance between the front end and the rear end of the system can be correspondingly reduced, thereby being beneficial to controlling the whole length of the system and being beneficial to lightening and thinning the system.
In an exemplary embodiment, the visual system further comprises a first spacer element located on the second side of the first lens and in contact with the second side portion of the first lens. The visual system of the present application may satisfy the conditional expression-40 < (F1/R2) × (D1 m-D1 s)/CP 1<0, where F1 is the effective focal length of the first lens group, R2 is the radius of curvature of the second side of the first lens, D1m is the outer diameter of the second side of the first spacer element, D1s is the inner diameter of the first side of the first spacer element, and CP1 is the thickness of the first spacer element in a direction parallel to the optical axis. The effective focal length of the first lens group, the curvature radius of the second side surface of the first lens, the outer diameter of the second side surface of the first spacing element, the inner diameter of the first side surface of the first spacing element and the thickness of the first spacing element along the direction parallel to the optical axis are controlled to meet the condition that-40 < (F1/R2) × (D1 m-D1 s)/CP 1<0, so that the contact area between the flange surface of the lens and the end surface of the spacing element during assembly can be ensured, the stability after assembly and the uniform dispensing requirement on the periphery are ensured, and the reasonable distribution of the edge thickness and the central thickness of the lens is ensured, namely the thickness ratio of the formed lens is controlled within a reasonable range and necessary guarantee is provided; meanwhile, the bending degree of the first lens can be ensured to be in a reasonable range, and the molding quality of the lens is ensured.
In an exemplary embodiment, the visual system further comprises a first spacer element located on the second side of the first lens and in contact with the second side portion of the first lens. The visual system of the present application may satisfy the condition 0< (n1×cp1+n3×cp2)/EP 12<4, where N1 is a refractive index of the first lens, CP1 is a thickness of the first spacer element in a direction parallel to the optical axis, N3 is a refractive index of the third lens, CP2 is a thickness of the second spacer element in a direction parallel to the optical axis, and EP12 is a distance between the first spacer element and the second spacer element on the optical axis, that is, a distance between the second side of the first spacer element to the first side of the second spacer element on the optical axis. The refractive index of the first lens, the thickness of the first spacing element along the direction parallel to the optical axis, the refractive index of the third lens, the thickness of the second spacing element along the direction parallel to the optical axis and the distance between the first spacing element and the second spacing element on the optical axis are controlled to meet the condition 0< (N1×CP1+N3×CP2)/EP 12<4, so that the light deflection angle of the folded light path can be ensured, and the system can be ensured to reach the maximum field angle; and moreover, the whole system is compact in structure and light and thin in thickness, meanwhile, the processing manufacturability of the spacing element can be guaranteed, and the spacing element can meet certain strength and thickness.
In an exemplary embodiment, the quarter wave plate may be attached to the reflective polarizing element, and the reflective polarizing element may be attached to the second side of the first lens. More specifically, the first side of the quarter wave plate may be bonded to the second side of the reflective polarizing element, and the first side of the reflective polarizing element may be bonded to the second side of the first lens. That is, the first lens, the reflective polarizing element, and the quarter wave plate may be sequentially arranged from the first side to the second side along the optical axis. The polarizing element is attached to the quarter wave plate and is attached to the light emitting side of the first lens, so that the distance between the lens and the display can be greatly shortened, the size of the whole imaging module is reduced, and the decisive effect is played for the weight thinning of the whole imaging module. In addition, the two can be attached to each other, so that a larger half field angle Semi-FOV and a better imaging experience can be brought.
In an exemplary embodiment, at least one of the first and second sides of each of the first to third lenses may be aspherical. The near display surface and the far display surface of each lens of the first lens to the third lens are aspheric, so that the optical aberration of each lens, namely, spherical aberration, astigmatism, field curvature and the like, can be greatly reduced, the optical aberration of the whole system can be eliminated as much as possible, the imaging definition of the system is improved, and the high-quality restoring effect of the color of the whole system is guaranteed.
In an exemplary embodiment, the visual system may further include a pressing ring structure, which may be disposed at an end of the lens barrel near the first side, and the pressing ring structure may be engaged with an outer side surface of the lens barrel near the end of the first side by, for example, a screw structure or a concave-convex engagement structure. The lens barrel far display end (first side end) is provided with a thread structure, the inner side end surface of the pressing ring structure can be used for fixing the flange surface of the far display side (first side) of the first lens, so that the first lens is fixed reliably, after the thread is screwed and fixed, the other side (second side of the first lens) can be subjected to dispensing solidification, the mode of direct glue solidification is better than that of direct glue solidification, and the exposed most areas around the un-light-receiving part of the far display surface of the first lens can be structurally protected. It should be noted that, in other exemplary embodiments, the connection or the matching manner of the pressing ring structure and the lens barrel may be adjusted according to the need, and the description of the present application is merely exemplary and not limiting.
In an exemplary embodiment, the lens barrel may have a protruding portion at a position near the first side end portion inside the lens barrel. The first lens may be located at a first side of the protruding portion, and the second side of the first lens may be in contact with the first side of the protruding portion. In an exemplary embodiment, the first lens may be located between the pressing ring structure and the protruding portion of the lens barrel, i.e., the first side of the first lens may contact the second side of the pressing ring structure, and the second side of the first lens may contact the first side of the protruding portion of the lens barrel. In an exemplary embodiment, the second lens may be located at a second side of the protruding portion of the lens barrel, and the first side of the second lens may contact the second side of the protruding portion. The lens barrel is internally provided with a protruding part which is used for bearing against the near display surface (the second side surface) of the first lens and the far display surface (the first side surface) of the second lens, and the bearing area is equivalent to the flange bearing surfaces of the first lens and the second lens, so that the stability of the vertical shaft of the group in the direction can be ensured, the protruding part has a certain thickness, and the certain pressure born by the group can be ensured.
Fig. 20 illustrates a propagation path diagram of light rays through a vision system of an exemplary embodiment of the present application. Fig. 21 is a partially enlarged view of fig. 20. As shown in fig. 20 and 21, the optical system according to the exemplary embodiment of the present application may include a first lens L1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens L2, and a third lens L3, which are sequentially arranged from a first side to a second side. In actual use, the optical system according to the exemplary embodiment of the present application may be used as a VR lens, in which case the first side corresponds to the human eye side and the second side corresponds to the display side. The optical system may further comprise an image plane IMG located at the display side. The light beam emitted from the image plane IMG sequentially passes through the third lens L3, the second lens L2, and the quarter wave plate QWP to the reflective polarizing element RP, is reflected at the reflective polarizing element RP and passes through the quarter wave plate QWP, the second lens L2, and the third lens L3 again to the second side of the third lens L3, and the light beam is reflected again at the second side of the third lens L3 and sequentially passes through the third lens L3, the second lens L2, the quarter wave plate QWP, the reflective polarizing element RP, and the first lens L1 to exit toward the human eye side. In an exemplary embodiment, the second side of the third lens L3 may be provided with a partially reflective element, for example, and in particular, the partially reflective element may be a semi-transparent and semi-reflective film layer plated on the second side of the third lens L3, for example.
In an exemplary embodiment, the vision system of the present application may include at least one aperture. The diaphragm can restrict the light path and control the intensity of light. The aperture may be provided in a suitable position of the visual system as desired, for example, the aperture may be provided between the first side (the human eye side) and the first lens.
In an exemplary embodiment, the above-described visual system may optionally further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.
According to the visual system of the above-described embodiment of the present application, by providing a first lens group, a second lens group, and a third lens group, which are assembled in a lens barrel, in order from a first side to a second side along an optical axis, wherein the first lens group includes a first lens, a reflective polarizing element, and a quarter wave plate; the second lens group comprises a second lens with positive focal power or negative focal power, and the second side surface of the second lens group is a concave surface; the third lens group includes a third lens having positive optical power; and the center thickness of the first lens on the optical axis is smaller than the center thickness of the second lens on the optical axis; and the visual system further comprises a second spacer element positioned on a second side of the second lens and in contact with a second side portion of the second lens; meanwhile, controlling the curvature radius R3 of the first side surface of the second lens, the thickness CP2 of the second spacing element along the direction parallel to the optical axis and the inner diameter d2m of the second side surface of the second spacing element to satisfy the condition-20 < R3×CP2/d2m <0; and controls the maximum field angle FOV of the visual system, the effective focal length f3 of the third lens, and the maximum height L of the lens barrel in the optical axis direction to satisfy the condition 0< tan (FOV/4) ×f3/L <13. The method can ensure the passing of marginal light, the realization of the maximum half field angle Semi-FOV of the system, the final imaging of the light emitted by the pupil of the system on a display, the molding processing requirement of the second interval element mold, and meanwhile, the distortion and the astigmatic size of the whole system can be positively influenced, so that the system can better meet the requirements of definition and color reduction degree.
According to the visual system of the exemplary embodiment of the application, the visual system has the characteristics of being lighter, thinner, high-performance and easy to manufacture, can provide better comprehensive look and feel and use experience for users, and can also realize reduction of production cost and improvement of production efficiency.
Specific examples of visual systems applicable to the above embodiments are further described below with reference to the accompanying drawings.
Example 1
The following describes a visual system according to embodiment 1 of the present application with reference to fig. 2, 3, 4, and 5, 6, and 7. Fig. 2, 3 and 4 show schematic structural views of the visual system according to example 1 of the present application in three different embodiments (embodiment 1-1, embodiment 1-2, embodiment 1-3), respectively.
As shown in fig. 2, 3 and 4, the visual system includes a lens barrel P0 and a lens assembly mounted in the lens barrel P0, arranged in order from a first side (human eye side) to a second side (display side) along an optical axis: a first lens L1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens L2, and a third lens L3.
In this embodiment, the first lens L1, the reflective polarizing element RP and the quarter wave plate QWP may form a first lens group, specifically, a first side (a surface near the human eye side, a surface far from the display side) of the quarter wave plate QWP is attached to a second side (a surface near the display side, a surface far from the human eye side) of the reflective polarizing element RP, and a first side (a surface near the human eye side, a surface far from the display side) of the reflective polarizing element RP is attached to a second side (a surface near the display side, a surface far from the human eye side) of the first lens L1.
In embodiments 1-1 and 1-2, the visual system further includes a first spacer element P1 located between the first lens L1 and the second lens L2, the first spacer element P1 being in partial contact with a second side (a surface on the side closer to the display, on the side farther from the human eye) of the first lens L1; and a second spacer element P2 between the second lens L2 and the third lens L3, the second spacer element P2 being in partial contact with a second side (a surface on the side closer to the display, away from the human eye) of the second lens L2.
In embodiments 1 to 3, the visual system includes a pressing ring structure M disposed at an end of the first side of the lens barrel P0, the pressing ring structure M being engaged with an outer side surface of the lens barrel P0 near the end of the first side by a screw structure or a concave-convex fitting structure. The barrel P0 has a protruding portion T inside near the first side end. The first lens L1 is located at a first side of the protruding portion T, and a second side of the first lens L1 contacts the first side of the protruding portion T. More specifically, the first lens L1 is located between the press ring structure M and the protruding portion T, i.e., the first side of the first lens L1 is in contact with the second side of the press ring structure M, and the second side of the first lens L1 is in contact with the first side of the protruding portion T. The second lens L2 is located at the second side of the protruding portion T, and the first side of the second lens L2 is in contact with the second side of the protruding portion T. The visual system further comprises a second spacer element P2 located between the second lens L2 and the third lens L3, the second spacer element P2 being in partial contact with a second side (surface on the side closer to the display, away from the side of the human eye) of the second lens L2.
Table 1 shows the basic parameters of the visual system of example 1, wherein the radius of curvature and the thickness/distance are both in millimeters (mm).
| Face number | Surface name | Surface type | Radius of curvature | Thickness/distance | Refractive index | Coefficient of dispersion | Coefficient of taper |
| Spherical surface | Infinity is provided | Infinity is provided | |||||
| STO | Diaphragm (STO) | Spherical surface | Infinity is provided | 15.0000 | |||
| S1 | First lens (L1) | Aspherical surface | 8754.5421 | 1.3840 | 1.5460 | 55.9235 | 0.0000 |
| S2 | Reflective polarizing element (RP) | Aspherical surface | -190.8169 | 0.1167 | 1.5000 | 57.0000 | 0.0000 |
| S3 | Quarter Wave Plate (QWP) | Aspherical surface | -190.8169 | 0.1167 | 1.5000 | 57.0000 | |
| S4 | Aspherical surface | -190.8169 | 1.6060 | ||||
| S5 | Second lens (L2) | Aspherical surface | -184.0565 | 2.6232 | 1.5460 | 55.9235 | 0.0000 |
| S6 | Aspherical surface | 497.6533 | 1.9633 | 0.0000 | |||
| S7 | Third lens (L3) | Aspherical surface | 148.1683 | 8.1906 | 1.5460 | 55.9235 | 0.0000 |
| S8 | Partially reflective layer (BS) | Aspherical surface | -79.0573 | -8.1906 | 1.5460 | 55.9235 | 0.0000 |
| S7 | Aspherical surface | 148.1683 | -1.9633 | ||||
| S6 | Partially reflective layer (BS) | Aspherical surface | 497.6533 | -2.6232 | 1.5460 | 55.9235 | |
| S5 | Aspherical surface | -184.0565 | -1.6060 | ||||
| S4 | Reflective polarizing element (RP) | Aspherical surface | -190.8169 | -0.1167 | 1.5000 | 57.0000 | |
| S3 | Quarter Wave Plate (QWP) | Aspherical surface | -190.8169 | 0.1167 | 1.5000 | 57.0000 | |
| S2 | Aspherical surface | -190.8169 | 1.6060 | ||||
| S5 | Second lens (L2) | Aspherical surface | -184.0565 | 2.6232 | 1.5460 | 55.9235 | |
| S6 | Aspherical surface | 497.6533 | 1.9633 | ||||
| S7 | Third lens (L3) | Aspherical surface | 148.1683 | 8.1906 | 1.5460 | 55.9235 | |
| S8 | Aspherical surface | -79.0573 | 3.9996 |
TABLE 1
In embodiment 1, the first side S1, the second side S2, and the first side S5, the second side S6 of the first lens L1 and the first side S7, the second side S8 of the third lens L3 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 below shows the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1 to S2, S5 to S8 in example 1 4 、A 6 、A 8 、A 10 And A 12 。
| Face number/coefficient | A4 | A6 | A8 | A10 | A12 |
| S1 | -2.8696E+00 | -1.4092E-01 | 7.0513E-02 | 2.1664E-02 | 2.1644E-03 |
| S2 | -3.2158E+00 | 5.5279E-01 | 3.4760E-01 | 5.3632E-02 | 0.0000E+00 |
| S5 | -4.4011E-01 | 5.2211E-01 | 4.6823E-02 | -2.1850E-02 | -4.3901E-03 |
| S6 | -6.8752E+00 | -4.5557E-01 | 2.7056E-01 | 1.2383E-01 | 1.5685E-02 |
| S7 | -1.0170E+01 | -1.7265E+00 | -3.7244E-01 | -4.8996E-02 | -4.7041E-03 |
| S8 | -1.8905E+00 | -9.9943E-02 | 1.7689E-02 | 6.7021E-03 | 1.4276E-03 |
TABLE 2
The relevant parameter values in this embodiment are shown in table 7, in combination with fig. 2, 3, 4 and 1, respectively, wherein d1s is the inner diameter of the first side of the first spacer element P1; d1m is the outer diameter of the second side of the first spacer element P1; d2s is the inner diameter of the first side of the second spacer element P2; d2m is the inner diameter of the second side of the second spacer element P2; d2s is the outer diameter of the first side of the second spacer element P2; d0s is the inner diameter of the first side end face of the lens barrel P0; d0m is the inner diameter of the second side end surface of the lens barrel P0; d0s is the outer diameter of the first side end surface of the lens barrel P0; d0m is the outer diameter of the second side end face of the lens barrel P0; CP1 is the thickness of the first spacer element P1 in the direction parallel to the optical axis; EP12 is the distance on the optical axis from the second side of the first spacer element P1 to the first side of the second spacer element P2; CP2 is the thickness of the second spacer element P2 in the direction parallel to the optical axis; and L is the maximum height of the lens barrel P0 in the optical axis direction. The unit of each of the above parameters shown in Table 7 is millimeter (mm).
Fig. 5 shows on-axis chromatic aberration curves for the vision system of example 1, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6 shows astigmatism curves for the visual system of example 1, which represent meridional and sagittal image surface curvature. Fig. 7 shows distortion curves for the visual system of example 1, which represent distortion magnitude values for different field angles. As can be seen from fig. 5 to 7, the visual system according to embodiment 1 can achieve good imaging quality.
Example 2
A visual system according to embodiment 2 of the present application is described below with reference to fig. 8, 9, 10, and 11, 12, and 13. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 8, 9 and 10 show schematic structural views of the visual system according to example 2 of the present application in three different embodiments (embodiment 2-1, embodiment 2-2, embodiment 2-3), respectively.
As shown in fig. 8, 9, and 10, the visual system includes a lens barrel P0 and a lens assembly mounted in the lens barrel P0, arranged in order from a first side (human eye side) to a second side (display side) along an optical axis: a first lens L1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens L2, and a third lens L3.
In this embodiment, the first lens L1, the reflective polarizing element RP and the quarter wave plate QWP may form a first lens group, specifically, a first side (a surface near the human eye side, a surface far from the display side) of the quarter wave plate QWP is attached to a second side (a surface near the display side, a surface far from the human eye side) of the reflective polarizing element RP, and a first side (a surface near the human eye side, a surface far from the display side) of the reflective polarizing element RP is attached to a second side (a surface near the display side, a surface far from the human eye side) of the first lens L1.
In embodiments 2-1 and 2-3, the visual system further includes a first spacer element P1 located between the first lens L1 and the second lens L2, the first spacer element P1 being in partial contact with a second side (a surface on the side closer to the display, away from the human eye) of the first lens L1; and a second spacer element P2 between the second lens L2 and the third lens L3, the second spacer element P2 being in partial contact with a second side (a surface on the side closer to the display, away from the human eye) of the second lens L2.
In embodiment 2-2, the visual system includes a pressing ring structure M disposed at an end of the first side of the lens barrel P0, the pressing ring structure M being engaged with an outer side surface of the lens barrel P0 near the end of the first side by a screw structure or a concave-convex engagement structure. The barrel P0 has a protruding portion T inside near the first side end. The first lens L1 is located at a first side of the protruding portion T, and a second side of the first lens L1 contacts the first side of the protruding portion T. More specifically, the first lens L1 is located between the press ring structure M and the protruding portion T, i.e., the first side of the first lens L1 is in contact with the second side of the press ring structure M, and the second side of the first lens L1 is in contact with the first side of the protruding portion T. The second lens L2 is located at the second side of the protruding portion T, and the first side of the second lens L2 is in contact with the second side of the protruding portion T. The visual system further comprises a second spacer element P2 located between the second lens L2 and the third lens L3, the second spacer element P2 being in partial contact with a second side (surface on the side closer to the display, away from the side of the human eye) of the second lens L2.
Table 3 shows the basic parameters of the visual system of example 2, wherein the radius of curvature and the thickness/distance are both in millimeters (mm). In this embodiment, the first side S1, the second side S2 of the first lens L1, the first side S5, the second side S6 of the second lens L2, and the first side S7, the second side S8 of the third lens L3 are aspherical, and Table 4 shows the higher order coefficients A of the aspherical mirrors S1 to S2, S5 to S8 that can be used in embodiment 2 4 、A 6 、A 8 、A 10 And A 12 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
| Face number | Surface name | Surface type | Radius of curvature | Thickness/distance | Refractive index | Coefficient of dispersion | Coefficient of taper |
| Spherical surface | Infinity is provided | Infinity is provided | |||||
| STO | Diaphragm (STO) | Spherical surface | Infinity is provided | 15.0000 | |||
| S1 | First lens (L1) | Aspherical surface | 2789.1272 | 1.0043 | 1.5460 | 55.9235 | 0.0000 |
| S2 | Reflective polarizing element (RP) | Aspherical surface | 2470.3815 | 0.1167 | 1.5000 | 57.0000 | 0.0000 |
| S3 | Quarter Wave Plate (QWP) | Aspherical surface | 2470.3815 | 0.1167 | 1.5000 | 57.0000 | |
| S4 | Aspherical surface | 2470.3815 | 0.5021 | ||||
| S5 | Second lens (L2) | Aspherical surface | -8214.3861 | 5.7586 | 1.5460 | 55.9235 | 0.0000 |
| S6 | Aspherical surface | -69.5470 | 0.5926 | 0.0000 | |||
| S7 | Third lens (L3) | Aspherical surface | -244.5231 | 5.4280 | 1.5460 | 55.9235 | 0.0000 |
| S8 | Partially reflective layer (BS) | Aspherical surface | -84.8873 | -5.4280 | 1.5460 | 55.9235 | 0.0000 |
| S7 | Aspherical surface | -244.5231 | -0.5926 | ||||
| S6 | Partially reflective layer (BS) | Aspherical surface | -69.5470 | -5.7586 | 1.5460 | 55.9235 | |
| S5 | Aspherical surface | -8214.3861 | -0.5021 | ||||
| S4 | Reflective polarizing element (RP) | Aspherical surface | 2470.3815 | -0.1167 | 1.5000 | 57.0000 | |
| S3 | Quarter Wave Plate (QWP) | Aspherical surface | 2470.3815 | 0.1167 | 1.5000 | 57.0000 | |
| S2 | Aspherical surface | 2470.3815 | 0.5021 | ||||
| S5 | Second lens (L2) | Aspherical surface | -8214.3861 | 5.7586 | 1.5460 | 55.9235 | |
| S6 | Aspherical surface | -69.5470 | 0.5926 | ||||
| S7 | Third lens (L3) | Aspherical surface | -244.5231 | 5.4280 | 1.5460 | 55.9235 | |
| S8 | Aspherical surface | -84.8873 | 3.9999 |
TABLE 3 Table 3
| Face number/coefficient | A4 | A6 | A8 | A10 | A12 |
| S1 | -3.6018E+00 | 1.2695E+00 | 4.7443E-01 | 7.1528E-02 | -1.4922E-03 |
| S2 | -9.4220E-01 | 8.9412E-01 | 1.7058E-02 | -3.3960E-02 | 0.0000E+00 |
| S5 | 5.1424E+00 | 1.3650E+00 | 2.4407E-01 | 3.2280E-02 | 1.7383E-03 |
| S6 | 8.0121E+00 | 3.6713E+00 | 8.8309E-01 | 1.3423E-01 | 8.2026E-03 |
| S7 | 9.0265E-01 | 2.4468E+00 | 8.3286E-01 | 1.6586E-01 | 1.3741E-02 |
| S8 | -1.1466E+00 | 4.9872E-01 | 1.7023E-01 | 3.2630E-02 | 3.4093E-03 |
TABLE 4 Table 4
The values of the relevant parameters in example 2 are shown in Table 7, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 7 are millimeters (mm).
Fig. 11 shows on-axis chromatic aberration curves for the vision system of example 2, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12 shows astigmatism curves for the visual system of example 2, which represent meridional image surface curvature and sagittal image surface curvature. Fig. 13 shows distortion curves of the visual system of example 2, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 11 to 13, the visual system according to embodiment 2 can achieve good imaging quality.
Example 3
The following describes a visual system according to embodiment 3 of the present application with reference to fig. 14, 15, 16, and 17, 18, and 19. Fig. 14, 15 and 16 show schematic structural views of the visual system according to example 3 of the present application in three different embodiments (embodiment 3-1, embodiment 3-2, embodiment 3-3), respectively.
As shown in fig. 14, 15, and 16, the visual system includes a lens barrel P0 and a lens assembly mounted in the lens barrel P0, arranged in order from a first side (human eye side) to a second side (display side) along an optical axis: a first lens L1, a reflective polarizing element RP, a quarter wave plate QWP, a second lens L2, and a third lens L3.
In this embodiment, the first lens L1, the reflective polarizing element RP and the quarter wave plate QWP may form a first lens group, specifically, a first side (a surface near the human eye side, a surface far from the display side) of the quarter wave plate QWP is attached to a second side (a surface near the display side, a surface far from the human eye side) of the reflective polarizing element RP, and a first side (a surface near the human eye side, a surface far from the display side) of the reflective polarizing element RP is attached to a second side (a surface near the display side, a surface far from the human eye side) of the first lens L1.
In embodiments 3-1 and 3-2, the visual system further includes a first spacer element P1 located between the first lens L1 and the second lens L2, the first spacer element P1 being in partial contact with a second side (a surface on the side closer to the display, away from the human eye) of the first lens L1; and a second spacer element P2 between the second lens L2 and the third lens L3, the second spacer element P2 being in partial contact with a second side (a surface on the side closer to the display, away from the human eye) of the second lens L2.
In embodiment 3-3, the visual system includes a pressing ring structure M disposed at an end of the first side of the lens barrel P0, the pressing ring structure M being engaged with an outer side surface of the lens barrel P0 near the end of the first side by a screw structure or a concave-convex fitting structure. The barrel P0 has a protruding portion T inside near the first side end. The first lens L1 is located at a first side of the protruding portion T, and a second side of the first lens L1 contacts the first side of the protruding portion T. More specifically, the first lens L1 is located between the press ring structure M and the protruding portion T, i.e., the first side of the first lens L1 is in contact with the second side of the press ring structure M, and the second side of the first lens L1 is in contact with the first side of the protruding portion T. The second lens L2 is located at the second side of the protruding portion T, and the first side of the second lens L2 is in contact with the second side of the protruding portion T. The visual system further comprises a second spacer element P2 located between the second lens L2 and the third lens L3, the second spacer element P2 being in partial contact with a second side (surface on the side closer to the display, away from the side of the human eye) of the second lens L2.
Table 5 shows the basic parameters of the visual system of example 3, wherein the radius of curvature and the thickness/distance are both in millimeters (mm). In this embodiment, the first side S1, the second side S2 of the first lens L1, the first side S5, the second side S6 of the second lens L2, and the first side S7, the second side S8 of the third lens L3 are aspherical, and Table 6 shows the higher order coefficients A that can be used for the aspherical mirrors S1 to S2, S5 to S8 in embodiment 3 4 、A 6 、A 8 、A 10 And A 12 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 5
| Face number/coefficient | A4 | A6 | A8 | A10 | A12 |
| S1 | -3.0330E+00 | 3.6707E-01 | 5.0305E-02 | -3.5976E-02 | -1.3539E-02 |
| S2 | -7.2934E-01 | 1.5132E+00 | 2.6397E-01 | -6.8650E-03 | 0.0000E+00 |
| S5 | 3.7524E+00 | 6.8796E-01 | -1.0104E-01 | -3.6767E-02 | -3.5757E-03 |
| S6 | 3.8298E+00 | 3.1386E+00 | 7.8452E-01 | 1.3239E-01 | 1.0056E-02 |
| S7 | -8.5055E-01 | 3.6336E+00 | 1.3345E+00 | 2.6875E-01 | 2.3008E-02 |
| S8 | -1.2873E+00 | 4.7125E-01 | 2.2297E-01 | 4.9171E-02 | 5.5000E-03 |
TABLE 6
The values of the relevant parameters in example 3 are shown in Table 7, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 7 are millimeters (mm).
Fig. 17 shows on-axis chromatic aberration curves for the vision system of example 3, which represent the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 18 shows astigmatism curves for the visual system of example 3, which represent meridional image surface curvature and sagittal image surface curvature. Fig. 19 shows distortion curves of the visual system of example 3, which represent distortion magnitude values corresponding to different angles of view. As can be seen from fig. 17 to 19, the visual system according to embodiment 3 can achieve good imaging quality.
| Parameters/embodiments | 1-1 | 1-2 | 1-3 | 2-1 | 2-2 | 2-3 | 3-1 | 3-2 | 3-3 |
| d1s | 49.9212 | 49.9212 | / | 47.6464 | / | 47.6464 | 42.1287 | 43.1412 | / |
| D1m | 54.5023 | 54.5023 | / | 50.6864 | / | 50.6864 | 48.8000 | 47.5000 | / |
| d2s | 50.3062 | 53.3875 | 50.3062 | 48.7403 | 48.7403 | 48.2521 | 43.6902 | 43.6902 | 43.6902 |
| d2m | 50.3062 | 52.4519 | 50.3062 | 48.7403 | 48.7403 | 48.2521 | 43.6902 | 43.6902 | 43.6902 |
| D2s | 59.6000 | 58.8935 | 59.6000 | 53.0000 | 53.0000 | 51.4000 | 50.4000 | 50.4000 | 50.4000 |
| d0s | 46.1900 | 46.1900 | 54.6253 | 41.8197 | 50.3851 | 41.8197 | 37.9104 | 37.9104 | 47.3516 |
| d0m | 62.7682 | 62.7682 | 62.7682 | 56.1059 | 56.1059 | 56.1059 | 46.7214 | 46.0415 | 52.9991 |
| D0s | 54.5076 | 54.5076 | 55.8136 | 49.6543 | 51.9000 | 49.6543 | 46.7214 | 46.0415 | 49.6714 |
| D0m | 64.0000 | 64.0000 | 64.0000 | 57.0000 | 57.0000 | 57.0000 | 54.0000 | 54.0000 | 54.0000 |
| CP1 | 1.6423 | 1.6423 | / | 3.3299 | / | 3.3299 | 0.1000 | 1.7894 | / |
| EP12 | 2.8168 | 1.9788 | / | 2.1214 | / | 2.0214 | 2.4487 | 2.4487 | / |
| CP2 | 2.8168 | 0.9380 | 0.1000 | 0.1000 | 0.1000 | 0.0500 | 0.1000 | 0.1000 | 0.1000 |
| L | 12.2396 | 13.6000 | 13.8983 | 13.0000 | 11.3100 | 13.0000 | 13.5000 | 13.5000 | 11.8274 |
TABLE 7
Further, in embodiments 1 to 3, the effective focal length f of the visual system, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the center thickness dr of the reflective polarizing element on the optical axis, the center thickness dp of the quarter wave plate on the optical axis, the sum Σct of the center thicknesses of the first lens, the second lens, and the third lens on the optical axis, the distance TD between the first side surface of the first lens to the second side surface of the third lens on the optical axis, and the maximum field angle FOV of the visual system are shown in table 8.
| Parameters/embodiments | 1 | 2 | 3 |
| f(mm) | 27.5796 | 20.0897 | 21.1036 |
| f1(mm) | 342.0668 | -39644.6826 | 214.7058 |
| f2(mm) | -245.7568 | 128.4338 | 2735.7769 |
| f3(mm) | 95.6359 | 235.3232 | 112.7273 |
| dr(mm) | 0.1167 | 0.1167 | 0.1167 |
| dp(mm) | 0.1167 | 0.1167 | 0.1167 |
| ΣCT(mm) | 12.1978 | 12.1909 | 13.8713 |
| TD(mm) | 16.0004 | 13.5189 | 15.1566 |
| FOV(°) | 100.0000 | 90.0000 | 90.0000 |
TABLE 8
Examples 1 to 3 each satisfy the conditions shown in table 9.
| Condition/example | 1-1 | 1-2 | 1-3 | 2-1 | 2-2 | 2-3 | 3-1 | 3-2 | 3-3 |
| tan(FOV/4)×f3/L | 3.6436 | 3.2791 | 3.2087 | 7.4980 | 8.6184 | 7.4980 | 3.4588 | 3.4588 | 3.9479 |
| R3×CP2/d2m(mm) | -10.3059 | -3.2915 | -0.3659 | -16.8534 | -16.8534 | -8.5119 | -0.4821 | -0.4821 | -0.4821 |
| R6/d0m×EPD(mm) | -6.9966 | -6.9966 | -6.9966 | -8.4046 | -8.4046 | -8.4046 | -6.2711 | -6.3637 | -5.5283 |
| D0m/L×f/ΣCT | 11.8228 | 10.6402 | 10.4118 | 7.2255 | 8.3052 | 7.2255 | 6.0855 | 6.0855 | 6.9461 |
| R1/(d0m+d0s) | 80.3477 | 80.3477 | 74.5743 | 28.4821 | 26.1912 | 28.4821 | 1.9773 | 1.9933 | 1.6676 |
| (Vr+Vp)/V2×D2s/d2s | 2.4151 | 2.2487 | 2.4151 | 2.2167 | 2.2167 | 2.1715 | 2.3516 | 2.3516 | 2.3516 |
| (Nr+Np)×D0s/f | 5.9291 | 5.9291 | 6.0712 | 7.4149 | 7.7502 | 7.4149 | 6.6417 | 6.5451 | 7.0611 |
| D0m/(TD+dr+dp) | 3.9424 | 3.9424 | 3.9424 | 4.1448 | 4.1448 | 4.1448 | 3.5088 | 3.5088 | 3.5088 |
| |f2|/(D2s+d2m)×CP2(mm) | 6.2985 | 2.0703 | 0.2236 | 0.1262 | 0.1262 | 0.0644 | 2.9076 | 2.9076 | 2.9076 |
| |R4/d2s+R5/d2m|×CT2(mm) | 33.6758 | 31.8620 | 33.6758 | 37.1068 | 37.1068 | 37.4823 | 14.1456 | 14.1456 | 14.1456 |
| |R3/RRP1|×(d0m-d2m) | 12.0205 | 9.9508 | 12.0205 | 24.4917 | 24.4917 | 26.1151 | 1.6431 | 1.2746 | 5.0460 |
| (N1×CP1+N3×CP2)/EP12 | 2.4474 | 2.0159 | / | 2.4996 | / | 2.5850 | 0.1263 | 1.1929 | / |
| (F1/R2)×(D1m-d1s)/CP1 | -5.0005 | -5.0005 | / | -14.6509 | / | -14.6509 | -36.8601 | -1.3459 | / |
TABLE 9
The present application also provides an imaging device provided with an electron-sensitive element for imaging, which may be a photosensitive coupling element (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor element (Complementary Metal Oxide Semiconductor, CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the above-described visual system.
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 should be understood by those skilled in the art that the scope of protection referred to in this application is not limited to the specific combination of the above technical features, but also encompasses other technical solutions formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. 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 (10)
1. The visual system is characterized by comprising a lens barrel, a first lens group, a second lens group and a third lens group which are assembled in the lens barrel and are sequentially arranged from a first side to a second side along an optical axis, wherein,
the first lens group comprises a first lens, a reflective polarizing element and a quarter wave plate;
the second lens group comprises a second lens with positive focal power or negative focal power, and the second side surface of the second lens group is a concave surface;
the third lens group includes a third lens having positive optical power;
the center thickness of the first lens on the optical axis is smaller than the center thickness of the second lens on the optical axis;
The visual system further includes a second spacer element positioned on a second side of the second lens and in contact with a second side portion of the second lens; and
the visual system satisfies:
-20mm < R3×CP2/d2m <0mm, and
0<tan(FOV/4)×f3/L<13，
wherein R3 is a radius of curvature of the first side surface of the second lens, CP2 is a thickness of the second spacer element in a direction parallel to the optical axis, d2m is an inner diameter of the second side surface of the second spacer element, FOV is a maximum field angle of the visual system, f3 is an effective focal length of the third lens, and L is a maximum height of the lens barrel in the direction of the optical axis.
2. The visual system according to claim 1, wherein a sum Σct of an outer diameter D0m of the second side end face of the lens barrel, an effective focal length f of the visual system, and center thicknesses of the first lens, the second lens, and the third lens on the optical axis, respectively, satisfies:
4<D0m/L×f/ΣCT<15。
3. the visual system according to claim 1, wherein a radius of curvature R6 of the second side surface of the third lens, an inner diameter d0m of the second side end surface of the lens barrel, and an entrance pupil diameter EPD of the visual system satisfy:
-12mm<R6/d0m×EPD<0mm。
4. the visualization system of claim 1, wherein the first side of the first lens is convex, and
The radius of curvature R1 of the first side surface of the first lens, the inner diameter d0m of the second side end surface of the lens barrel, and the inner diameter d0s of the first side end surface of the lens barrel satisfy:
0<R1/(d0m+d0s)<88。
5. the visual system of claim 1, wherein the refractive index Vr of the reflective polarizing element, the refractive index Vp of the quarter wave plate, the refractive index V2 of the second lens, the outer diameter D2s of the first side of the second spacer element, and the inner diameter D2s of the first side of the second spacer element satisfy:
1<(Vr+Vp)/V2×D2s/d2s<4。
6. the visual system according to claim 1, wherein a refractive index Nr of the reflective polarizing element, a refractive index Np of the quarter wave plate, an outer diameter D0s of the first side end face of the lens barrel, and an effective focal length f of the visual system satisfy:
4<(Nr+Np)×D0s/f<10。
7. the visual system of claim 1, wherein the effective focal length f2 of the second lens and the outer diameter D2s of the first side of the second spacer element satisfy:
0mm<|f2|/(D2s+d2m)×CP2<8mm。
8. the visual system of claim 1, wherein a radius of curvature R4 of the second side of the second lens, an inner diameter d2s of the first side of the second spacer element, a radius of curvature R5 of the first side of the third lens, and a center thickness CT2 of the second lens on the optical axis satisfy:
10mm<|R4/d2s+R5/d2m|×CT2<41mm。
9. The visual system of claim 1 wherein the first and second sides of the reflective polarizing element have the same radius of curvature and
the radius of curvature RRP1 of the first side surface of the reflective polarizing element and the inner diameter d0m of the second side end surface of the lens barrel satisfy:
0<|R3/RRP1|×(d0m-d2m)<30。
10. the VR device comprising the visual system of at least one of claims 1 to 9, wherein the first side is a human eye side and the second side is a display side.
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