CN219936197U - Visual lens - Google Patents

Abstract

The utility model provides a visual lens, which comprises a first lens, a second lens and a third lens which are sequentially arranged from the eye side to the display side; the first spacer is at least partially in contact with a surface of the first lens facing the display side; the second spacer is at least partially contacted with the surface of the second lens facing the display side, and the outer ring surfaces of the first spacer and the second spacer are abutted against the inner wall surface of the lens barrel; at least one of the surfaces of the lens facing the display side or the surface facing the human eye side has a partially reflective layer; a reflective polarizing element; a quarter wave plate, a reflective polarizing element and the quarter wave plate being located on the human eye side or the display side of the first lens; the curvature radius R3 of the surface of the second lens facing the human eye side, the curvature radius R4 of the surface of the second lens facing the display side, and the distance EP12 between the first spacer and the second spacer on the optical axis satisfy: -138< (R3+R4)/EP 12< -68.0. The utility model solves the problem that miniaturization and Gao Zuzhuang yield of the visual lens are difficult to be compatible in the prior art.

Description

Visual lens

Technical Field

The utility model relates to the technical field of optical imaging equipment, in particular to a visual lens.

Background

With the progress and development of technology, the AR/VR lens is coming into the opportunity for the second development. The AR/VR lens plays an important role in the human-computer interaction process, and the AR/VR lens has the advantages of miniaturization and light weight. In the process of the gradual development of AR/VR shots, users are increasingly demanding on their imaging quality and are required to be smaller and smaller. For miniaturized AR/VR lenses, the length is small, the width is smaller, the size of the lens is gradually reduced, and the processing difficulty of the lens is increased. Meanwhile, the miniaturized lens is not easy to assemble into the lens barrel, and particularly for the lens positioned in the middle of the whole optical system, as the lens needs to be assembled to the middle position of the lens barrel, the sight line is worst in the middle position of the lens assembly, and the lens assembly position is easy to deviate in the process of assembling the lens in the middle of the optical system, so that the assembly yield of the lens is reduced.

That is, in the prior art, there is a problem that miniaturization and Gao Zuzhuang yield are difficult to be compatible.

Disclosure of Invention

The utility model mainly aims to provide a visual lens, which solves the problem that miniaturization and Gao Zuzhuang yield of the visual lens are difficult to be compatible in the prior art.

In order to achieve the above object, the present utility model provides a visual lens comprising: a lens barrel; a first lens, a second lens and a third lens which are sequentially arranged from the human eye side to the display side along the optical axis of the visual lens; a first spacer at least partially contacting a surface of the first lens facing the display side; a second spacer in at least partial contact with a surface of the second lens facing the display side, outer annular surfaces of the first spacer and the second spacer being in abutment with an inner wall surface of the lens barrel; at least one of the surfaces of the lens facing the display side or the surface facing the human eye side has a partially reflective layer; a reflective polarizing element; a quarter wave plate, a reflective polarizing element and the quarter wave plate being located on the human eye side or the display side of the first lens; wherein, the curvature radius R3 of the surface of the second lens facing the human eye side, the curvature radius R4 of the surface of the second lens facing the display side, and the distance EP12 between the first spacer and the second spacer on the optical axis satisfy the following conditions: -138< (R3+R4)/EP 12< -68.0.

Further, the reflective polarizing element is located near the human eye side with respect to the quarter wave plate, and both the reflective polarizing element and the quarter wave plate have a surface facing the human eye side and a surface facing the display side.

Further, a distance EP01 between the surface of the lens barrel facing the human eye side and the surface of the first spacer facing the human eye side on the optical axis, a center thickness CTQ of the quarter-wave plate, and a center thickness CTB of the reflective polarizing element satisfy: EP 01/(ctq+ctb) <1.5.

Further, the visual lens further includes a second auxiliary spacer at least partially contacting a surface of the second spacer facing the display side.

Further, the combined focal length f23 of the second lens and the third lens, the maximum thickness CP2 of the second separator in the extending direction of the optical axis, and the maximum thickness CP2b of the second auxiliary separator in the extending direction of the optical axis satisfy: 4.0< f 23/(CP2+CP2b) <11.0.

Further, the surface of the first lens facing the human eye side or the surface of the first lens facing the display side is a plane.

Further, a reflective polarizing element or a quarter wave plate is in contact with at least a portion of the plane of the first lens.

Further, the effective focal length f2 of the second lens, the distance EP12 on the optical axis between the first spacer and the second spacer satisfies: 125.5< f2/EP12<200.

Further, the inner diameter d0m of the surface of the lens barrel facing the display side, the inner diameter d0s of the surface of the lens barrel facing the human eye side, the maximum height L of the lens barrel, and the distance TD on the optical axis between the surface of the first lens facing the human eye side to the surface of the third lens facing the display side satisfy: 1.5< d0m/d0s+L/TD <4.0.

Further, the inner diameter d1s of the surface of the first spacer facing the human eye side, the radius of curvature R2 of the surface of the first lens facing the display side, the effective focal length f1 of the first lens, and the abbe number V1 of the first lens satisfy: 3.0< d1s/R2+f1/V1<5.5.

Further, the effective focal length f of the visual lens, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens, and the maximum height L of the lens barrel satisfy: 7.5< f1/f+CT1/L <11.0.

Further, the inner diameter D0m of the surface of the lens barrel facing the display side, the outer diameter D2m of the surface of the second spacer facing the display side, and half of the maximum field angle Semi-FOV of the visual lens satisfy: 0.8< d0m/D2m TAN (Semi-FOV) <2.0.

Further, the maximum height L of the lens barrel, the maximum thickness CP1 of the first spacer in the extending direction of the optical axis, the distance EP01 on the optical axis from the surface of the lens barrel facing the human eye side to the surface of the first spacer facing the human eye side, the distance EP12 on the optical axis between the first spacer and the second spacer, the air space T23 on the optical axis between the second lens and the third lens, and the center thickness CT3 of the third lens satisfy: 0.5< (L-EP 01-CP1-EP 12)/(T23+CT3) <4.0.

Further, the combined focal length F1 of the reflective polarizing element, the quarter-wave plate, and the first lens, the distance EP01 on the optical axis between the surface of the barrel facing the human eye side and the surface of the first spacer facing the human eye side satisfy: 29.0< F1/EP01<58.

By applying the technical scheme of the utility model, the visual lens comprises a lens barrel, a first lens, a second lens and a third lens which are sequentially arranged from the human eye side to the display side along the optical axis of the visual lens, and also comprises a first separator, a second separator, a reflective polarizing element and a quarter wave plate, wherein the first separator is at least partially contacted with the surface of the first lens facing the display side; the second spacer is at least partially contacted with the surface of the second lens facing the display side, and the outer ring surfaces of the first spacer and the second spacer are abutted against the inner wall surface of the lens barrel; at least one of the surfaces of the lens facing the display side or the surface facing the human eye side has a partially reflective layer; the reflective polarizing element and the quarter-wave plate are positioned on the human eye side or the display side of the first lens; wherein, the curvature radius R3 of the surface of the second lens facing the human eye side, the curvature radius R4 of the surface of the second lens facing the display side, and the distance EP12 between the first spacer and the second spacer on the optical axis satisfy the following conditions: -138< (R3+R4)/EP 12< -68.0.

The utility model relates to a three-piece type visual lens, which can control the shape of a second lens by reasonably setting the relation between the curvature radius of the surface of the second lens facing the eye side and the surface facing the display side and the distance between a first isolation piece and a second isolation piece, reduces the forming difficulty of the second lens on the basis of ensuring the miniaturization of the second lens, and simultaneously controls the shape of the second lens within a reasonable range, thereby being beneficial to the accurate bearing and leaning together of the second lens and the first isolation piece and the second isolation piece and the rapid and accurate assembly of the second lens. Meanwhile, the first and second spacers are controlled to bear against the inner wall surface of the lens barrel, the straight dimension is reasonably controlled, the requirement on the contour line of the matched parts of the lens barrel and the first and second spacers is reduced, the lens and the spacers are favorably assembled into the lens barrel, the difficulty of the lens assembly process is reduced, the assembly yield of the lens is improved, and the high yield is realized on the basis of ensuring miniaturization. In addition, by arranging the reflective polarizing element, the quarter wave plate and the partial reflecting layer on the lens, the optical path of light in the visual lens can be increased, the imaging quality of the visual lens is increased on the basis of ensuring miniaturization, and the visual lens has the advantages of miniaturization, high image quality and high yield.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic structural diagram of a visual lens according to an alternative embodiment of the present utility model;

fig. 2 to 4 are schematic structural views showing a vision lens according to an example one of the present utility model in a first state, a second state, and a third state;

fig. 5 to 7 show an on-axis chromatic aberration curve, an astigmatic curve, and a distortion curve, respectively, of example one of the present utility model;

fig. 8 to 10 are schematic structural views showing a visual lens according to example two of the present utility model in a first state, a second state, and a third state;

fig. 11 to 13 show an on-axis chromatic aberration curve, an astigmatic curve, and a distortion curve, respectively, of example two of the present utility model;

fig. 14 to 16 are schematic views showing the structure of a visual lens of example three of the present utility model in a first state, a second state, and a third state;

fig. 17 to 19 show an on-axis chromatic aberration curve, an astigmatic curve, and a distortion curve, respectively, of example three of the present utility model;

Fig. 20 shows a ray pattern of a visual lens according to an alternative embodiment of the utility model.

Wherein the above figures include the following reference numerals:

RP, reflective polarizing element; s1, a surface of a reflective polarizing element facing a human eye side; s2, the surface of the reflective polarizing element facing the display (the surface of the quarter wave plate facing the human eye); QWP, quarter wave plate; s3, the surface of the quarter wave plate facing the display side (the surface of the first lens facing the human eye side); e1, a first lens; s4, the surface of the first lens facing the display side; e2, a second lens; s5, the surface of the second lens facing the human eye side; s6, the surface of the second lens facing the display side; e3, a third lens; s7, the surface of the third lens facing the human eye side; s8, the surface of the third lens facing the display side; s9, a display.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that 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 utility model belongs unless otherwise indicated.

In the present utility model, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present utility model.

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 utility model.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens 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. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). The surface facing the human eye side is determined to be convex when the R value is positive, and is determined to be concave when the R value is negative; the surface facing the display side is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The utility model provides a visual lens, which aims to solve the problem that miniaturization and Gao Zuzhuang yield are difficult to be compatible in the prior art.

As shown in fig. 1 to 20, the visual lens includes a lens barrel, a first lens, a second lens, and a third lens arranged in order from the human eye side to the display side along an optical axis of the visual lens, and further includes a first spacer, a second spacer, a reflective polarizing element, and a quarter wave plate, the first spacer being at least partially in contact with a surface of the first lens facing the display side; the second spacer is at least partially contacted with the surface of the second lens facing the display side, and the outer ring surfaces of the first spacer and the second spacer are abutted against the inner wall surface of the lens barrel; at least one of the surfaces of the lens facing the display side or the surface facing the human eye side has a partially reflective layer; the reflective polarizing element and the quarter-wave plate are positioned on the human eye side or the display side of the first lens; wherein, the curvature radius R3 of the surface of the second lens facing the human eye side, the curvature radius R4 of the surface of the second lens facing the display side, and the distance EP12 between the first spacer and the second spacer on the optical axis satisfy the following conditions: -138< (R3+R4)/EP 12< -68.0.

The application relates to a three-piece type visual lens, which can control the shape of a second lens by reasonably setting the relation between the curvature radius of the surface of the second lens facing the eye side and the surface facing the display side and the distance between a first isolation piece and a second isolation piece, reduces the forming difficulty of the second lens on the basis of ensuring the miniaturization of the second lens, and simultaneously controls the shape of the second lens within a reasonable range, thereby being beneficial to the accurate bearing and leaning together of the second lens and the first isolation piece and the second isolation piece and the rapid and accurate assembly of the second lens. Meanwhile, the first and second spacers are controlled to bear against the inner wall surface of the lens barrel, the straight dimension is reasonably controlled, the requirement on the contour line of the matched parts of the lens barrel and the first and second spacers is reduced, the lens and the spacers are favorably assembled into the lens barrel, the difficulty of the lens assembly process is reduced, the assembly yield of the lens is improved, and the high yield is realized on the basis of ensuring miniaturization. In addition, by arranging the reflective polarizing element, the quarter wave plate and the partial reflecting layer on the lens, the optical path of light in the visual lens can be increased, the imaging quality of the visual lens is increased on the basis of ensuring miniaturization, and the visual lens has the advantages of miniaturization, high image quality and high yield.

Preferably, the radius of curvature R3 of the surface of the second lens facing the human eye side, the radius of curvature R4 of the surface of the second lens facing the display side, and the distance EP12 between the first spacer and the second spacer on the optical axis satisfy: -137.5< (r3+r4)/EP 12< -68.5.

In this embodiment, the reflective polarizing element is located close to the human eye side with respect to the quarter-wave plate, and both the reflective polarizing element and the quarter-wave plate have a surface facing the human eye side and a surface facing the display side. The setting of quarter wave plate and reflective polarizing element is favorable to increasing the total length that light was turned over in the visual lens, and as far as possible increases the angle of view when satisfying the focusing, increases user's visual experience, sets up reflective polarizing element and quarter wave plate in the visual lens simultaneously, can not lead to the visual lens too big under the prerequisite of effectively improving imaging quality, is favorable to the miniaturization of visual lens.

In the present embodiment, a distance EP01 between the surface of the lens barrel facing the human eye side and the surface of the first spacer facing the human eye side on the optical axis, a center thickness CTQ of the quarter-wave plate, and a center thickness CTB of the reflective polarizing element satisfy: EP 01/(ctq+ctb) <1.5. The distance from the surface of the lens barrel facing the human eye side to the first isolation piece and the relation between the quarter wave plate and the central thickness of the reflective polarizing element are controlled, so that the thin rear ratio of the edge thickness to the central thickness of the first lens is controlled, the first lens is formed conveniently, the limit process is avoided from being adopted for the first lens forming, and the forming yield of the first lens is improved. Preferably 0.7< ep 01/(ctq+ctb) <1.3.

In this embodiment, the visual lens further includes a second auxiliary spacer, the second auxiliary spacer being at least partially in contact with a surface of the second spacer facing the display side. The arrangement of the second auxiliary isolating piece is beneficial to controlling the maximum thickness of the second isolating piece and improving the forming process of the second isolating piece, and is beneficial to improving the stability of the visual lens.

In the present embodiment, the combined focal length f23 of the second lens and the third lens, the maximum thickness CP2 of the second separator in the extending direction of the optical axis, and the maximum thickness CP2b of the second auxiliary separator in the extending direction of the optical axis satisfy between: 4.0< f 23/(CP2+CP2b) <11.0. Through controlling f 23/(CP2+CP2b) in reasonable scope, be favorable to restricting the thickness of second spacer and second auxiliary spacer in reasonable scope, be favorable to the shaping of second spacer and second auxiliary spacer, second spacer and second auxiliary spacer can absorb the unnecessary light of boundary simultaneously, reduce stray light and enter into imaging system in, improved the imaging quality of visual camera lens. Preferably, 4.5< f 23/(CP 2+ CP2 b) <11.0.

In this embodiment, the surface of the first lens facing the human eye side or the surface of the first lens facing the display side is a plane. One side of the first lens is set to be a plane, which is favorable for connecting the reflective polarizing element or the quarter wave plate with the first lens and improving the attaching precision.

In this embodiment, the reflective polarizing element or the quarter wave plate is in contact with at least a portion of the plane of the first lens. The reflective polarizing element or the quarter wave plate is attached to the first lens, wherein when the surface of the first lens facing the human eye side is a plane, the quarter wave plate is attached to the surface of the first lens facing the human eye side, and the reflective polarizing element and the quarter wave plate are positioned on the human eye side of the first lens; when the surface of the first lens facing the display side is a plane, the reflective polarizing element is attached to the surface of the first lens facing the display side, and the reflective polarizing element and the quarter-wave plate are located between the first lens and the second lens.

In the present embodiment, the effective focal length f2 of the second lens, the distance EP12 on the optical axis between the first spacer and the second spacer satisfies: 125.5< f2/EP12<200. By limiting f2/EP12 within a reasonable range, the thickness and position of the non-optical effective portion of the second lens can be limited, which is beneficial to improving the processability of the second lens, controlling the emergent angle of the second lens and ensuring the imaging quality of the visual lens. Preferably 125.8< f2/EP12<200.

In the present embodiment, the inner diameter d0m of the surface of the lens barrel facing the display side, the inner diameter d0s of the surface of the lens barrel facing the human eye side, the maximum height L of the lens barrel, and the distance TD on the optical axis between the surface of the first lens facing the human eye side to the surface of the third lens facing the display side satisfy: 1.5< d0m/d0s+L/TD <4.0. The d0m/d0s+L/TD is limited in a reasonable range, so that the overall size of the visual lens is effectively restrained, the later matching with other modules is facilitated, the overall size of the lens barrel is restrained, the size of the lens barrel is reduced on the premise of ensuring the processability of the lens barrel, and the size of the visual lens is further reduced. Preferably, 1.8< d0m/d0s+L/TD <3.5.

In the present embodiment, the inner diameter d1s of the surface of the first spacer facing the human eye side, the radius of curvature R2 of the surface of the first lens facing the display side, the effective focal length f1 of the first lens, and the abbe number V1 of the first lens satisfy: 3.0< d1s/R2+f1/V1<5.5. The d1s/R2+f1/V1 is controlled within a reasonable range, so that the focal power of the first lens, the curvature radius of the surface facing the display side and the Abbe number of the first lens are controlled within a reasonable range, the shape of the first lens is controlled, the excessive light generated at the edge after the light is refracted and reflected by the second lens is blocked by the first isolating piece, the effective light is refracted or reflected by the first lens, the optimal image quality is obtained, and the imaging quality is improved. Preferably 3.4< d1s/R2+f1/V1<5.0.

In the present embodiment, the effective focal length f of the visual lens, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens, and the maximum height L of the lens barrel satisfy: 7.5< f1/f+CT1/L <11.0. Through controlling f1/f+CT1/L in a reasonable range, the focal power of each lens in the visual lens can be reasonably distributed, the mutual offset of positive and negative spherical differences between the front group lens and the rear group lens is facilitated, the off-axis aberration is facilitated to be corrected, the overall image quality of the system is improved, and meanwhile, the miniaturization and the structural compactness of the visual lens are facilitated. Preferably, 7.8< f1/f+CT1/L <10.8.

In the present embodiment, the inner diameter D0m of the surface of the lens barrel facing the display side, the outer diameter D2m of the surface of the second spacer facing the display side, and half of the maximum field angle Semi-FOV of the visual lens satisfy: 0.8< d0m/D2m TAN (Semi-FOV) <2.0. By controlling D0m/D2m TAN (Semi-FOV) within a reasonable range, the viewing angle of the visual lens can be constrained, so that the visual lens can be constrained on the premise of having a large viewing angle, and the inner diameter of the surface facing the display side and the outer diameter of the surface of the second spacer facing the display side can be constrained, thereby being beneficial to reducing the step structure of the visual lens in the radial direction and improving the assembly yield of the lens. Preferably, 1.1< d0m/D2m TAN (Semi-FOV) <1.7.

In the present embodiment, the maximum height L of the lens barrel, the distance EP01 between the surface of the lens barrel facing the human eye side and the surface of the first spacer facing the human eye side on the optical axis, the distance EP12 between the first spacer and the second spacer on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, and the center thickness CT3 of the third lens satisfy: 0.5< (L-EP 01-CP1-EP 12)/(T23+CT3) <4.0. The (L-EP 01-CP1-EP 12)/(T23+CT3) is controlled within a reasonable range, so that the thickness of each part in the lens barrel is reasonably distributed, the structural strength of each part is ensured, and the assembly yield of the lens is improved. Meanwhile, the front end of the lens barrel is guaranteed to have a certain wall thickness, and the reliability of the visual lens is improved effectively. Preferably, 1.0< (L-EP 01-CP1-EP 12)/(T23+CT3) <3.8.

In the present embodiment, the combined focal length F1 of the reflective polarizing element, the quarter-wave plate, and the first lens, the distance EP01 on the optical axis between the surface of the barrel toward the human eye side and the surface of the first spacer toward the human eye side satisfy: 29.0< F1/EP01<58. Through controlling F1 EP01 in reasonable within range, be favorable to rationally distributing the focal power of first lens, reflective polarizing element and quarter wave plate, guarantee the limit thickness size of first lens simultaneously, under the circumstances that is favorable to first lens shaping, improve the stability of assemblage of first lens, be favorable to improving the equipment yield of visual camera lens. Preferably 29.3< F1/EP01<57.

The visual lens in the present application may employ a plurality of lenses, for example, three as described above. By reasonably distributing the effective focal length, the surface shape, the center thickness of each lens, the axial distance between each lens and the like, the image quality of the visual lens can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the visual lens is more beneficial to production and machining and can be suitable for portable electronic equipment such as smart phones and the like.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, those skilled in the art will appreciate that the various results and advantages described in this specification can be obtained by varying the number of lenses making up a visual lens without departing from the claimed application. For example, although three lenses are described as an example in the embodiment, the visual lens is not limited to including three lenses. The visual lens may also include other numbers of lenses, if desired.

Fig. 1 shows a schematic structural diagram of a visual lens of the present application. Parameters d0s, d1s, etc. are also marked in fig. 1 to clearly and intuitively understand the meaning of the parameters. In order to facilitate the presentation of the visual lens structure and the specific surface shape, these parameters will not be shown in the drawings when specific examples are described later.

Wherein Dis refers to the maximum outer diameter of the surface of the i-th spacer facing the human eye side, dis refers to the minimum inner diameter of the surface of the i-th spacer facing the human eye side, dim refers to the maximum outer diameter of the surface of the i-th spacer facing the display side, dim refers to the minimum inner diameter of the surface of the i-th spacer facing the display side, wherein i is a value from 1 and 2. EP12 is the distance from the surface of the first spacer facing the display side to the surface of the second spacer facing the human eye side, d0s is the minimum inner diameter of the surface of the lens barrel facing the human eye side, and d0m is the minimum inner diameter of the surface of the lens barrel facing the display side.

Examples of specific surface types and parameters applicable to the visual lens of the above embodiment are further described below with reference to the drawings.

In the following examples, the first state, the second state, and the third state exist, and parameters such as the radius of curvature, the center thickness, and the distance between the lenses and the high order image coefficient of the first lens to the third lens of the visual lens in the first state, the second state, and the third state in the same example are the same, but the parameters such as the lens barrel P0, the thickness of the spacer, the inner diameter of the spacer, the outer diameter of the spacer, and the distance between the spacers are different, and the shape of a part of the lenses is different. Or the primary structure for imaging is the same, while the secondary structure for imaging is different.

Any of the following examples one to three is applicable to all embodiments of the present application.

Example one

As shown in fig. 2 to 7, a visual lens of example one of the present application is described. Fig. 2 shows a schematic structural diagram of the first-example visual lens in the first state, fig. 3 shows a schematic structural diagram of the first-example visual lens in the second state, and fig. 4 shows a schematic structural diagram of the first-example visual lens in the third state.

As shown in fig. 2, the visual lens sequentially comprises, from the human eye to the display: a reflective polarizing element RP, a quarter wave plate QWP, a first lens E1, a second lens E2 and a third lens E3.

In fig. 2, a first spacer P1 is provided between a first lens E1 and a second lens in the visual lens, and a second spacer P2 is provided between a second lens E2 and a third lens E3.

The second state shown in fig. 3 is similar to the first state shown in fig. 2, except that the spacers are slightly different in size.

The third state shown in fig. 4 is similar to the second state shown in fig. 3, except that the spacers are slightly different in size.

Table 1 shows a basic structural parameter table of a visual lens of example one, in which the unit of curvature radius, thickness/distance is millimeter mm, and in table 1, the arrangement order of the surface numbers is the order of passage of light rays, and refraction/reflection is the refraction or reflection effect of the light rays upon this passage.

Face number

Surface type

Radius of curvature

Thickness of (L)

Refractive index

Coefficient of dispersion

Refraction/reflection

Spherical surface

Infinite number of cases

Infinite number of cases

Refraction by refraction

STO

Diaphragm

Spherical surface

Infinite number of cases

15.0000

Refraction by refraction

S1

Reflective polarizing element (RP)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Refraction by refraction

S2

Quarter wave plate (QWR)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Refraction by refraction

S3

First lens (E1)

Spherical surface

Infinite number of cases

7.7731

1.545

56.0

Refraction by refraction

S4

Aspherical surface

-157.3057

2.8870

Refraction by refraction

S5

Second lens (E2)

Aspherical surface

-154.7712

3.5732

1.545

56.0

Refraction by refraction

S6

Partially reflective layer

Aspherical surface

-106.0013

-3.5732

1.545

56.0

Reflection of

S5

Aspherical surface

-154.7712

-2.8870

Refraction by refraction

S4

Aspherical surface

-157.3057

-7.7731

1.545

56.0

Refraction by refraction

S3

Quarter wave plate (QWR)

Spherical surface

Infinite number of cases

-0.2000

1.502

57.0

Refraction by refraction

S2

Reflective polarizing element (RP)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Reflection of

S3

Spherical surface

Infinite number of cases

7.7731

1.545

56.0

Refraction by refraction

S4

Aspherical surface

-157.3057

2.8870

Refraction by refraction

S5

Second lens (E2)

Aspherical surface

-154.7712

3.5732

1.545

56.0

Refraction by refraction

S6

Aspherical surface

-106.0013

0.9677

Refraction by refraction

S7

Third lens (E3)

Aspherical surface

47.1735

11.5989

1.545

56.0

Refraction by refraction

S8

Aspherical surface

-364.2246

2.9900

Refraction by refraction

S9

Display device

Spherical surface

Infinite number of cases

0.0000

TABLE 1

In example one, the surface of a part of the lenses of the first lens E1 to the third lens E3 facing the human eye and the surface facing the display are aspherical, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical 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 aspherical surface, c=1/R, i.e. paraxial curvature c is the reciprocal of the radius of curvature R in table 1 above; k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The cone coefficients and higher order coefficients A4, A6, A8, A10 that can be used for each of the aspherical mirror surfaces S4-S8 in example one are given in Table 2 below.

Face number	Coefficient of taper	A4	A6	A8	A10
						S4	0.0000	-1.12E-02	5.49E-02	-4.04E-03	6.23E-03
S5	0.0000	1.66E-01	-1.74E-01	4.65E-02	1.45E-02
						S6	0.0000	1.81E-01	-8.73E-02	1.66E-02	3.63E-03
S7	0.0000	-1.13E+00	1.01E-01	2.33E-02	1.02E-02
						S8	0.0000	4.88E-02	-6.33E-02	-4.22E-02	3.36E-02

TABLE 2

Fig. 6 shows an on-axis chromatic aberration curve of a vision lens of example one, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the vision lens. Fig. 7 shows an astigmatism curve of the visual lens of example one, which indicates meridional image surface curvature and sagittal image surface curvature. Fig. 8 shows distortion curves of the visual lens of example one, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 6 to 8, the visual lens provided in example one can achieve good imaging quality.

Example two

As shown in fig. 8 to 13, a visual lens of example two of the present application is described. Fig. 8 shows a schematic structural diagram of the second example visual lens in the first state, fig. 9 shows a schematic structural diagram of the second example visual lens in the second state, and fig. 10 shows a schematic structural diagram of the second example visual lens in the third state. For brevity, a description of some parts similar to those of the example one will be omitted.

As shown in fig. 8, the visual lens sequentially comprises, from the human eye to the display: a reflective polarizing element RP, a quarter wave plate QWP, a first lens E1, a second lens E2 and a third lens E3.

In fig. 8, a first spacer P1 is provided between the first lens E1 and the second lens in the visual lens, and a second spacer P2 is provided between the second lens E2 and the third lens E3.

The second state shown in fig. 9 differs from the first state shown in fig. 8 in that a second auxiliary spacer P2b is further included, the second auxiliary spacer P2b being located between the second spacer P2 and the third lens E3.

The third state shown in fig. 10 is similar to the second state shown in fig. 9, except that the spacers are slightly different in size.

Table 3 shows the basic structural parameter table of the visual lens of example two, in which the unit of curvature radius, thickness/distance is millimeter mm, and in table 3, the arrangement order of the surface numbers is the passing order of the light rays, and refraction/reflection is the refraction or reflection effect of the light rays at this time of the passing.

Face number

Surface type

Radius of curvature

Thickness of (L)

Refractive index

Coefficient of dispersion

Refraction/reflection

Spherical surface

Infinite number of cases

Infinite number of cases

Refraction by refraction

STO

Diaphragm

Spherical surface

Infinite number of cases

15.0000

Refraction by refraction

S1

Reflective polarizing element (RP)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Refraction by refraction

S2

Quarter wave plate (QWR)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Refraction by refraction

S3

First lens (E1)

Spherical surface

Infinite number of cases

5.0746

1.545

56.0

Refraction by refraction

S4

Aspherical surface

-135.5062

1.6509

Refraction by refraction

S5

Second lens (E2)

Aspherical surface

-244.3208

3.4593

1.545

56.0

Refraction by refraction

S6

Partially reflective layer

Aspherical surface

-135.4521

-3.4593

1.545

56.0

Reflection of

S5

Aspherical surface

-244.3208

-1.6509

Refraction by refraction

S4

Aspherical surface

-135.5062

-5.0746

1.545

56.0

Refraction by refraction

S3

Quarter wave plate (QWR)

Spherical surface

Infinite number of cases

-0.2000

1.502

57.0

Refraction by refraction

S2

Reflective polarizing element (RP)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Reflection of

S3

Spherical surface

Infinite number of cases

5.0746

1.545

56.0

Refraction by refraction

S4

Aspherical surface

-135.5062

1.6509

Refraction by refraction

S5

Second lens (E2)

Aspherical surface

-244.3208

3.4593

1.545

56.0

Refraction by refraction

S6

Aspherical surface

-135.4521

0.9571

Refraction by refraction

S7

Third lens (E3)

Aspherical surface

39.8803

4.2841

1.545

56.0

Refraction by refraction

S8

Aspherical surface

57.2991

14.3561

Refraction by refraction

S9

Display device

Spherical surface

Infinite number of cases

0.0000

TABLE 3 Table 3

The cone coefficients and higher order coefficients that can be used for each of the aspherical mirror surfaces S4-S8 in example two are given in table 4, and the surface shape of each of the aspherical lenses can be defined by, but not limited to, equation (1) in example one.

Face number	Coefficient of taper	A4	A6	A8	A10
						S4	0.0000	-3.58E-01	1.47E-01	-1.91E-02	-2.31E-03
S5	0.0000	1.63E-01	-1.54E-01	6.68E-02	-1.24E-02
						S6	0.0000	1.03E-01	-9.52E-02	3.61E-02	-3.42E-03
S7	0.0000	-1.11E+00	1.58E-01	4.94E-02	-4.89E-02
						S8	0.0000	1.48E+00	-2.30E-01	3.99E-02	-3.19E-02

TABLE 4 Table 4

Fig. 11 shows an on-axis chromatic aberration curve of a visual lens of example two, which indicates the convergence focus deviation of light rays of different wavelengths after passing through the visual lens. Fig. 12 shows an astigmatism curve of the visual lens of example two, which represents meridional image surface curvature and sagittal image surface curvature. Fig. 13 shows distortion curves of the visual lens of example two, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 11 to 13, the visual lens provided in example two can achieve good imaging quality.

Example three

As shown in fig. 14 to 19, a visual lens of example three of the present application is described. Fig. 14 shows a schematic structural view of the visual lens of example three in the first state, fig. 15 shows a schematic structural view of the visual lens of example three in the second state, and fig. 16 shows a schematic structural view of the visual lens of example three in the third state. For brevity, a description of some parts similar to those of the example one will be omitted.

As shown in fig. 14, the visual lens sequentially includes, from the human eye to the display: a reflective polarizing element RP, a quarter wave plate QWP, a first lens E1, a second lens E2 and a third lens E3.

In fig. 14, a first spacer P1 is provided between a first lens E1 and a second lens in the visual lens, and a second spacer P2 is provided between a second lens E2 and a third lens E3.

The second state shown in fig. 15 differs from the first state shown in fig. 14 in that a second auxiliary spacer P2b is further included, the second auxiliary spacer P2b being located between the second spacer P2 and the third lens E3.

The third state shown in fig. 16 is similar to the second state shown in fig. 15, except that the spacers are slightly different in size.

Table 5 shows the basic structural parameter table of the visual lens of example three, in which the unit of curvature radius, thickness/distance is millimeter mm, and in table 5, the arrangement order of the surface numbers is the passing order of light rays, and refraction/reflection is the refraction or reflection effect of the light rays at this time of passing.

Face number

Surface type

Radius of curvature

Thickness of (L)

Refractive index

Coefficient of dispersion

Refraction/reflection

Spherical surface

Infinite number of cases

Infinite number of cases

Refraction by refraction

STO

Diaphragm

Spherical surface

Infinite number of cases

15.0000

Refraction by refraction

S1

Reflective polarizing element (RP)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Refraction by refraction

S2

Quarter wave plate (QWR)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Refraction by refraction

S3

First lens (E1)

Spherical surface

Infinite number of cases

4.8900

1.545

56.0

Refraction by refraction

S4

Aspherical surface

-129.1119

1.7404

Refraction by refraction

S5

Second lens (E2)

Aspherical surface

-217.1750

3.3539

1.545

56.0

Refraction by refraction

S6

Partially reflective layer

Aspherical surface

-133.5351

-3.3539

1.545

56.0

Reflection of

S5

Aspherical surface

-217.1750

-1.7404

Refraction by refraction

S4

Aspherical surface

-129.1119

-4.8900

1.545

56.0

Refraction by refraction

S3

Quarter wave plate (QWR)

Spherical surface

Infinite number of cases

-0.2000

1.502

57.0

Refraction by refraction

S2

Reflective polarizing element (RP)

Spherical surface

Infinite number of cases

0.2000

1.502

57.0

Reflection of

S3

Spherical surface

Infinite number of cases

4.8900

1.545

56.0

Refraction by refraction

S4

Aspherical surface

-129.1119

1.7404

Refraction by refraction

S5

Second lens (E2)

Aspherical surface

-217.1750

3.3539

1.545

56.0

Refraction by refraction

S6

Aspherical surface

-133.5351

2.1430

Refraction by refraction

S7

Third lens (E3)

Aspherical surface

41.2768

4.4036

1.545

56.0

Refraction by refraction

S8

Aspherical surface

62.8945

13.2511

Refraction by refraction

S9

Display device

Spherical surface

Infinite number of cases

TABLE 5

The cone coefficients and higher order coefficients that can be used for each of the aspherical mirror surfaces S4-S8 in example three are given in table 6, and the surface shape of each of the aspherical lenses can be defined by, but not limited to, equation (1) in example one.

TABLE 6

Fig. 17 shows an on-axis chromatic aberration curve of the vision lens of example three, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the vision lens. Fig. 18 shows an astigmatism curve of the visual lens of example three, which represents meridional image surface curvature and sagittal image surface curvature. Fig. 19 shows distortion curves of the visual lens of example three, which represent distortion magnitude values corresponding to different angles of view.

As can be seen from fig. 17 to 19, the visual lens given in example three can achieve good imaging quality.

In summary, in the first to third examples, the reflective polarizing element RP, the quarter-wave plate QWP and the first lens are glued together, that is, the surface S2 of the reflective polarizing element RP facing the display side and the surface S2 of the quarter-wave plate QWP facing the human eye side are the same surface, and the surface S3 of the quarter-wave plate QWP facing the display side and the surface S3 of the first lens facing the human eye side are the same surface.

In examples one to three, the partially reflective layer is provided on the surface S6 of the second lens facing the display side.

The following description will be given with reference to fig. 20, the direction of the light emitted by the display S9 is sequentially transmitted through the surface S8 of the third lens facing the display side, the surface S7 of the third lens facing the human eye side, the surface S6 of the second lens facing the display side, the surface S4 of the first lens facing the display side, and then the light is incident on the surface S3 of the quarter wave plate facing the display side, the quarter wave plate QWP changes the light into the light with the first polarization state, the light with the first polarization state is incident on the surface S2 of the reflective polarizing element facing the display side and then reflected to form the first reflected light, the first reflected light is incident on the surface S3 of the quarter wave plate facing the display side, the quarter wave plate QWP changes the first reflected light into the light with the second polarization state, the light with the second polarized state sequentially passes through the surface S4 of the first lens facing the display side, the surface S5 of the second lens facing the display side, the surface S6 facing the display side, the second polarized light is reflected on the surface S6 of the reflective element facing the second polarizing element, and then the second polarized light is transmitted through the surface S2 of the reflective element facing the second polarizing element, and then the second polarized light is reflected on the surface S4 of the reflective element facing the second polarizing element, and then the second polarized light is reflected on the surface of the reflective element facing the second polarizing element, and then forms the second polarized light.

In the process of changing the light of the first polarization state into the light of the third polarization state, the light of the first polarization state passes through the quarter wave plate twice, so that the polarization direction of the light of the first polarization state is perpendicular to the polarization direction of the light of the third polarization state, and the reflective polarizing element reflects the light of the first polarization state and transmits the light of the third polarization state.

In summary, examples one to three satisfy the relationships shown in table 7, respectively.

TABLE 7

Table 8 gives some of the parameters for the visual shots of examples one through three.

Condition/example	1-1	1-2	1-3	2-1	2-2	2-3	3-1	3-2	3-3
										d1s	60.373	63.503	63.503	60.127	60.126	59.945	59.199	59.199	59.199
D2m	63.781	73.197	72.195	67.416	72.229	72.229	66.485	69.327	68.755
										d0s	74.039	67.418	67.418	61.629	61.629	61.629	60.702	60.701	60.702
d0m	63.052	81.651	80.650	74.965	74.961	74.961	74.033	74.037	73.465
										EP01	9.711	8.555	8.555	5.453	5.453	4.423	5.453	5.453	5.453
CP1	0.170	0.100	0.100	0.100	0.200	2.726	0.100	0.100	0.100
										EP12	3.784	3.608	3.608	3.914	4.359	2.764	3.656	3.656	3.656
CP2	13.974	13.817	13.817	15.057	0.200	0.200	15.500	14.795	14.795
										L	32.715	29.612	29.612	28.055	28.055	28.055	28.055	28.055	28.055
CP2b	/	/	/	/	14.412	14.412	/	0.200	0.200

TABLE 8

In table 7 and table 8, 1-1 indicates a first state of the visual lens in example one, 1-2 indicates a second state of the visual lens in example one, and 1-3 indicates a third state of the visual lens in example one. 2-1 represents the first state of the visual lens in example two, 2-2 represents the second state of the visual lens in example two, 2-3 represents the third state of the visual lens in example two, 3-1 represents the first state of the visual lens in example three, 3-2 represents the second state of the visual lens in example three, and 3-3 represents the third state of the visual lens in example three.

Table 9 gives the effective focal lengths of the first lens, the second optical element, and the third lens of the visual lenses of examples one to three.

Basic data/examples	1	2	3
				Semi-FOV(°)	53	53	53
f(mm)	28.292	30.093	29.947
				F1(mm)	287.85	247.96	236.26
f2(mm)	600.04	550.08	625.62
				f3(mm)	77.19	220.86	205.00
f23(mm)	68.09	156.04	153.23

TABLE 9

The utility model also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (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 lens.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (14)

1. A visual lens, comprising:

a lens barrel;

a first lens, a second lens and a third lens which are sequentially arranged from the human eye side to the display side along the optical axis of the visual lens;

a first spacer at least partially in contact with a surface of the first lens facing the display side;

a second spacer in at least partial contact with a surface of the second lens facing the display side, an outer annular surface of the first spacer and the second spacer bearing against an inner wall surface of the lens barrel;

At least one of the surfaces of the lens facing the display side or the surface facing the human eye side has a partially reflective layer;

a reflective polarizing element;

a quarter wave plate, the reflective polarizing element and the quarter wave plate being located on the human eye side or the display side of the first lens;

wherein, the curvature radius R3 of the surface of the second lens facing the human eye side, the curvature radius R4 of the surface of the second lens facing the display side, and the distance EP12 between the first spacer and the second spacer on the optical axis satisfy: -138< (R3+R4)/EP 12< -68.0.

2. The visual lens of claim 1 wherein the reflective polarizing element is proximate to the human eye side relative to the quarter wave plate, the reflective polarizing element and the quarter wave plate each having a surface facing the human eye side and a surface facing the display side.

3. The visual lens according to claim 1, wherein a distance EP01 between a surface of the barrel toward the human eye side and a surface of the first spacer toward the human eye side on the optical axis, a center thickness CTQ of the quarter-wave plate, and a center thickness CTB of the reflective polarizing element satisfy: EP 01/(ctq+ctb) <1.5.

4. The visual lens of claim 1, further comprising a second auxiliary spacer in at least partial contact with a surface of the second spacer facing the display side.

5. The visual lens according to claim 4, wherein a combined focal length f23 of the second lens and the third lens, a maximum thickness CP2 of the second spacer in the extending direction of the optical axis, and a maximum thickness CP2b of the second auxiliary spacer in the extending direction of the optical axis satisfy: 4.0< f 23/(CP2+CP2b) <11.0.

6. The visual lens of claim 1, wherein a surface of the first lens facing the human eye side or a surface of the first lens facing the display side is planar.

7. The visual lens of claim 6 wherein the reflective polarizing element or the quarter wave plate is in contact with at least a portion of the plane of the first lens.

8. The visual lens according to any one of claims 1 to 7, wherein an effective focal length f2 of the second lens, a distance EP12 on the optical axis between the first spacer and the second spacer satisfies: 125.5< f2/EP12<200.

9. The visual lens according to any one of claims 1 to 7, wherein a distance TD on the optical axis between a surface of the lens barrel facing the display side, an inner diameter d0m of a surface of the lens barrel facing the human eye side, a maximum height L of the lens barrel, a surface of the first lens facing the human eye side, and a surface of the third lens facing the display side satisfies: 1.5< d0m/d0s+L/TD <4.0.

10. The visual lens according to any one of claims 1 to 7, wherein an inner diameter d1s of a surface of the first spacer facing the human eye side, a radius of curvature R2 of a surface of the first lens facing the display side, an effective focal length f1 of the first lens, and an abbe number V1 of the first lens satisfy between: 3.0< d1s/R2+f1/V1<5.5.

11. The visual lens according to any one of claims 1 to 7, wherein an effective focal length f of the visual lens, an effective focal length f1 of the first lens, a center thickness CT1 of the first lens, and a maximum height L of the lens barrel satisfy: 7.5< f1/f+CT1/L <11.0.

12. The visual lens according to any one of claims 1 to 7, wherein an inner diameter D0m of a surface of the barrel facing the display side, an outer diameter D2m of a surface of the second spacer facing the display side, and a half of a maximum field angle Semi-FOV of the visual lens satisfy: 0.8< d0m/D2m TAN (Semi-FOV) <2.0.

13. The visual lens according to any one of claims 1 to 7, wherein a maximum height L of the lens barrel, a maximum thickness CP1 of the first spacer in an extending direction of the optical axis, a distance EP01 on the optical axis from a surface of the lens barrel facing the human eye side to a surface of the first spacer facing the human eye side, a distance EP12 on the optical axis between the first spacer and the second spacer, an air interval T23 on the optical axis between the second lens and the third lens, and a center thickness CT3 of the third lens satisfy: 0.5< (L-EP 01-CP1-EP 12)/(T23+CT3) <4.0.

14. The visual lens according to any one of claims 1 to 7, wherein a distance EP01 on the optical axis between a combined focal length F1 of the first lens, the reflective polarizing element, and the quarter-wave plate, a surface of the lens barrel facing the human eye side, and a surface of the first spacer facing the human eye side satisfies: 29.0< F1/EP01<58.