CN109491049A - Projection optical system and augmented reality glasses with it - Google Patents
Projection optical system and augmented reality glasses with it Download PDFInfo
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- CN109491049A CN109491049A CN201811616806.8A CN201811616806A CN109491049A CN 109491049 A CN109491049 A CN 109491049A CN 201811616806 A CN201811616806 A CN 201811616806A CN 109491049 A CN109491049 A CN 109491049A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
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Abstract
本发明公开一种投影光学系统及具有其的增强现实眼镜，所述投影光学系统包括第一镜组，所述第一镜组由四个透镜组成，由物侧至像侧依序为：具有正光焦度的第一透镜、具有正光焦度的第二透镜，具有负光焦度的第三透镜以及具有正光焦度的第四透镜，四个透镜的物侧表面与像侧表面均为非球面结构。另外所述第一透镜与所述第二透镜的焦距满足关系0.5<f1/f2<25；所述第三透镜与所述第四透镜的焦距满足关系‑5<f3/f4<0，其中，f1为所述第一透镜的焦距，f2为所述第二透镜的焦距，f3为所述第三透镜的焦距，f4为所述第四透镜的焦距。本发明提供一种投影光学系统及具有其的增强现实眼镜，旨在解决现有技术中投影光学系统体积过大，投影光学系统照度低的问题。
The invention discloses a projection optical system and augmented reality glasses having the same. The projection optical system includes a first mirror group, and the first mirror group is composed of four lenses. From the object side to the image side, in order: The first lens with positive refractive power, the second lens with positive refractive power, the third lens with negative refractive power, and the fourth lens with positive refractive power, the object-side surfaces and image-side surfaces of the four lenses are not spherical structure. In addition, the focal length of the first lens and the second lens satisfies the relationship 0.5<f1/f2<25; the focal length of the third lens and the fourth lens satisfies the relationship-5<f3/f4<0, wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens. The present invention provides a projection optical system and augmented reality glasses having the same, aiming at solving the problems of excessively large volume of the projection optical system and low illumination of the projection optical system in the prior art.
Description
Technical field
The present invention relates to projection imaging field more particularly to a kind of projection optical system and with its augmented reality eye
Mirror.
Background technique
Optical projection system is widely used in projector and augmented reality (Augmented Reality, AR) glasses, existing
Optical projection system in, mainly passing through different lens combination reduces the aberration of optical system, resolution ratio is improved, to realize good
Good image quality.For AR glasses, excessive lens combination will lead to becoming large-sized for optical projection system, unfavorable
In the miniaturization of AR glasses.At present in the projection optical system of AR glasses in order to guarantee image quality, it will usually use five
Piece or five pieces or more of eyeglass be combined, more eyeglass can be such that AR Lens dimensions increase, and weight increases, and will lead to increasing
Add the light ray bending in projection optical system, influence the illumination of entire optical system, is unable to satisfy the requirement of AR glasses miniaturization.
Summary of the invention
The main object of the present invention is to provide a kind of projection optical system and the augmented reality glasses with it, it is intended to solve
Projection optical system volume is excessive in the prior art, the low problem of projection optical system illumination.
To achieve the above object, the present invention proposes that a kind of projection optical system, the projection optical system include the first mirror
Group, first microscope group are used to improve the illumination of the projection optical system, and first microscope group is made of four lens subassemblies,
Sequentially by object side to image side are as follows: the first lens with positive light coke, the object side surface of first lens are convex aspheric surface knot
Structure, image side surface are concave aspherical surface structure；The second lens with positive light coke, the object side surface of second lens are convex non-
Spherical structure, image side surface are convex aspheric surface structure；The third lens with negative power, the object side surface of the third lens
For concave aspherical surface structure, image side surface is convex aspheric surface structure；The 4th lens with positive light coke, the object of the 4th lens
Side surface is concave aspherical surface structure, and image side surface is convex aspheric surface structure；First lens, second lens, described
Three lens and the optical axis of the 4th lens is located on the same line, and meets following relationship: 0.5 < f1/f2 < 25；-5
<f3/f4<0；Wherein, f1 is the focal length of first lens, and f2 is the focal length of second lens, and f3 is the third lens
Focal length, f4 be the 4th lens focal length.
Optionally, the projection optical system meets following relationship: 0.2 < C1/C2 < 2；0.2<C3/C4<2；Wherein, C1 is
The center thickness of first lens, C2 are the center thickness of second lens, and C3 is the center thickness of the third lens,
C4 is the center thickness of the 4th lens.
Optionally, the projection optical system meets following relationship: 1 < A1/A3 < 10；0.01<A2/TTL<0.1；0.2<
EFFL/TTL<1；Wherein, interval of the A1 for the image side surface of first lens and the object side of second lens on optical axis
Distance, spacing distance of the A2 for the image side surface of second lens and the object side of the third lens on optical axis, A3 is institute
Spacing distance of the object side of the image side surface and the 4th lens of stating the third lens on optical axis, EFFL are the projection optics
The focal length of system, TTL are the optics overall length of the projection optical system.
Optionally, the projection optical system meets following relationship: Vd1 >=55, Vd2 >=55, Vd3≤30, Vd4 >=55；
Wherein, the Vd1 is the Abbe number of first lens, and the Vd2 is the Abbe number of second lens, and the Vd3 is institute
The Abbe number of the third lens is stated, the Vd4 is the Abbe number of the 4th lens.
Optionally, first lens are cyclic olefin polymer.
Optionally, second lens are cyclic olefin polymer.
Optionally, the third lens are cyclic polyolefin resin.
Optionally, the 4th lens are cyclic olefin polymer.
Optionally, the projection optical system further includes diaphragm, right-angle prism, polarization splitting prism and image planes；Wherein,
The diaphragm and the right-angle prism are set to first microscope group close to the side of the object side, the polarization splitting prism and institute
State side of the image planes set on first microscope group close to the image side；Light enters the right-angled edge after passing through from the diaphragm
Mirror, and the right-angle prism is projected after the slant reflection of the right-angle prism, into first microscope group, from first mirror
The light that group projects reaches the image planes after the polarization splitting prism.
To achieve the above object, the application proposes that a kind of augmented reality glasses, the augmented reality glasses include as above-mentioned
Projection optical system described in any embodiment.
In technical solution proposed by the present invention, the projection optical system includes the first microscope group, and first microscope group is by four
A lens composition, sequentially by object side to image side are as follows: the first lens with positive light coke, the second lens with positive light coke,
The third lens with negative power and the 4th lens with positive light coke, the object side surface and image side surface of four lens
It is non-spherical structure.In addition the focal length of first lens and second lens meets relationship 0.5 < f1/f2 < 25；It is described
The focal length of the third lens and the 4th lens meets relationship -5 < f3/f4 < 0.Five pieces or five pieces are used in compared with the prior art
The projection optical system that above lens combination is formed, first microscope group are combined by four lens, are effectively reduced
The size of projection optical system, reduces turnover number of the light in optical system, solves existing projection optical system
Size is larger, and the problem for causing projection optical system illumination low.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the structural schematic diagram of projection optical system of the present invention；
Fig. 2 is the axial spherical aberration figure of the embodiment of the present invention 1；
Fig. 3 is the chromatic longitudiinal aberration figure of the embodiment of the present invention 1；
Fig. 4 is the curvature of field and optical distortion figure of the embodiment of the present invention 1；
Fig. 5 is the modulation transfer function figure of the embodiment of the present invention 1；
Fig. 6 is the axial spherical aberration figure of the embodiment of the present invention 2；
Fig. 7 is the chromatic longitudiinal aberration figure of the embodiment of the present invention 2；
Fig. 8 is the curvature of field and optical distortion figure of the embodiment of the present invention 2；
Fig. 9 is the modulation transfer function figure of the embodiment of the present invention 2.
Drawing reference numeral explanation:
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as
Its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple " contain
Justice is at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. shall be understood in a broad sense,
For example, " fixation " may be a fixed connection, it may be a detachable connection, or integral；It can be mechanical connection, be also possible to
Electrical connection；It can be directly connected, the connection inside two elements or two can also be can be indirectly connected through an intermediary
The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
It in addition, the technical solution between each embodiment of the present invention can be combined with each other, but must be general with this field
Based on logical technical staff can be realized, it will be understood that when the combination of technical solution appearance is conflicting or cannot achieve this
The combination of technical solution is not present, also not the present invention claims protection scope within.
The present invention provides a kind of projection optical system and the augmented reality glasses with it.
Fig. 1 is please referred to, the projection optical system includes the first microscope group 100, and first microscope group 100 is described for improving
The illumination of projection optical system, first microscope group 100 are made of four lens subassemblies, sequentially by object side to image side are as follows: have
First lens 10 of positive light coke, the object side surface of first lens 10 are convex aspheric surface structure, and image side surface is recessed aspheric
Face structure；The second lens 20 with positive light coke, the object side surface of second lens 20 are convex aspheric surface structure, image side table
Face is convex aspheric surface structure；The third lens 30 with negative power, the object side surface of the third lens 30 are concave aspherical surface
Structure, image side surface are convex aspheric surface structure；The 4th lens 40 with positive light coke, the object side surface of the 4th lens 40
For concave aspherical surface structure, image side surface is convex aspheric surface structure；First lens 10, second lens 20, the third
Lens 30 and the optical axis of the 4th lens 40 is located on the same line, and meets following relationship: 0.5 < f1/f2 <
25；-5<f3/f4<0；Wherein, f1 is the focal length of first lens 10, and f2 is the focal length of second lens 20, and f3 is described
The focal length of the third lens 30, f4 are the focal length of the 4th lens 40.
In technical solution proposed by the present invention, the projection optical system includes the first microscope group 100, first microscope group
100 are made of four lens, sequentially by object side to image side are as follows: the first lens 10 with positive light coke, with positive light coke
Second lens 20, the third lens 30 with negative power and the 4th lens 40 with positive light coke, the object of four lens
Side surface and image side surface are non-spherical structure.In addition the focal length of first lens 10 and second lens 20, which meets, closes
It is 0.5 < f1/f2 < 25；The third lens 30 and the focal length of the 4th lens 40 meet relationship -5 < f3/f4 < 0.Compared to
The projection optical system formed in the prior art using five pieces or five pieces or more of lens combination, first microscope group 100 are passed through
Four lens are combined, and efficiently reduce the size of projection optical system, reduce turnover of the light in optical system
Number solves existing projection optical system size problem that is larger, and causing projection optical system illumination low.
In some alternative embodiments, the projection optical system meets following relationship: 0 < C1/C2 < 1,1 < C3/C4
<2。
In some alternative embodiments, the projection optical system meets following relationship: 0 < A1/A3 < 10,0 < A2/
TTL < 1,0 < EFFL/TTL < 1.
Wherein, f1 is the focal length of first lens 10；F2 is the focal length of second lens 20；F3 is that the third is saturating
The focal length of mirror 30；F4 is the focal length of the 4th lens 40.
C1 is the center thickness of first lens 10；C2 is the center thickness of second lens 20；C3 is described the
The center thickness of three lens 30；C4 is the center thickness of the 4th lens 40.
Spacing distance of the A1 for the image side surface of first lens 10 and the object side of second lens 20 on optical axis；
Spacing distance of the A2 for the image side surface of second lens 20 and the object side of the third lens 30 on optical axis；A3 is described
Spacing distance of the object side of the image side surface of the third lens 30 and the 4th lens 40 on optical axis.
TTL is the optics overall length of the projection optical system；EFFL is the focal length of the projection optical system.
In some alternative embodiments, the projection optical system meets following relationship: Vd1 >=55, Vd2 >=55,
Vd3≤30, Vd4 >=55；
Wherein, the Vd1 is the Abbe number of first lens 10, and the Vd2 is the Abbe number of second lens 20,
The Vd3 is the Abbe number of the third lens 30, and the Vd4 is the Abbe number of the 4th lens 40.
In some alternative embodiments, first lens 10, second lens 20 and the 4th lens
40 be cyclic olefin polymer (Cyclo Olefin Polymer, COP), and the third lens 30 are cyclic polyolefin resin (Cyclo
Olefin Copolymer, COC).It is understood that the application is without being limited thereto, in order to meet the requirement of projection optical system,
In another embodiment, the lens in first microscope group 100 can be other optical glass or optical plastic.
Referring to FIG. 1, the projection optical system further includes diaphragm 50, prism in the projection optical system of the application
60, polarization splitting prism 70 and image planes 90；Wherein, the diaphragm 50 is set to first microscope group 100 with the prism 60 and leans on
The side of the nearly object side, the polarization splitting prism 70 are set to first microscope group 100 close to the picture with the image planes 90
The side of side.In specific embodiment, the light that the diaphragm 50 issues is projecting prism 60 after the reflection of prism 60, and
Successively polarization splitting prism is injected after first lens 10, the second lens 20, the third lens 30 and the 4th lens 40
70, after the polarization splitting prism 70 light splitting, Ray Of Light transmits light in light splitting surface, projects the polarization splitting prism 70
Afterwards, image planes 90 are reached, another light beam is reflected in light splitting surface, after being projected from another surface of the polarization splitting prism 70, into
Enter in subsequent lighting system or other optical systems.
In some alternative embodiments, the projection optical system further includes protection glass 80, the protection glass
80 are set between the polarization splitting prism 70 and the image planes 90, and the protection glass 80 is for protecting the projection optics system
System.
The first embodiment projection optical system design data is as shown in table 1 below:
Table 1
In embodiment 1, each parameter is as described below:
F1=-26.99；F2=-6.75；F3=8.89；F4=-25.62.So f1/f2=4.0；F2/f3=-0.35.
C1=1.8；C2=2.42；C3=1.35；C4=1.45.So, C1/C2=0.74；C3/C4=0.93.
A1=0.51；A2=1.43；A3=0.1；TTL=25, EFFL=12.5.
A1/A3=5.1；A2/TTL=0.057；EFFL/TTL=0.5.
Wherein, from object side to image side, the object side surface of first lens 10 is the face S1 11, and image side surface is the face S2 12；
The object side surface of second lens 20 is the face S3 21, and image side surface is the face S4 22；The object side surface of the third lens 30 is
The face S5 31, image side surface are the face S6 32；The object side surface of 4th lens 40 is the face S7 41, and image side surface is the face S8 42.A2,
A4, A8, A10, A12, A14, A16 are the aspherical high-order coefficient of non-spherical lens, specific as shown in table 2.
Table 2
| Surface number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| The face S1 | -9.6E-05 | -2.1E-06 | 1.8E-05 | -9.5E-07 | -1.5E-08 | 2.7E-09 | -8.0E-11 |
| The face S2 | 2.4E-04 | 8.6E-05 | 2.1E-05 | -1.5E-06 | -4.3E-08 | 7.1E-09 | -2.0E-10 |
| The face S3 | 9.8E-04 | -4.8E-05 | -1.5E-05 | 6.0E-07 | 1.7E-08 | -5.3E-10 | -1.0E-11 |
| The face S4 | -1.9E-03 | -4.8E-05 | -9.8E-06 | -9.0E-07 | 1.1E-07 | -1.7E-09 | -3.0E-11 |
| The face S5 | -6.2E-03 | -1.1E-04 | 3.7E-05 | -1.8E-06 | 1.0E-08 | 1.4E-09 | -2.8E-11 |
| The face S6 | -3.2E-03 | 2.9E-05 | -5.2E-06 | 1.9E-07 | 2.0E-08 | -1.3E-09 | 2.1E-11 |
| The face S7 | 8.3E-03 | -5.2E-04 | 1.0E-05 | -9.3E-08 | -9.0E-09 | 4.7E-10 | -4.0E-12 |
| The face S8 | 4.8E-03 | -2.3E-04 | -3.2E-07 | 4.3E-07 | -9.2E-09 | -1.0E-09 | 3.4E-11 |
Referring to figure 2., Fig. 2 is the axial spherical aberration figure of embodiment 1, wherein axial spherical aberration refers to edge-light in optical system
Line focus between paraxial focus at a distance from, for evaluating the image quality of object point on axis；
Referring to figure 3., Fig. 3 is the chromatic longitudiinal aberration figure of embodiment 1, wherein chromatic longitudiinal aberration refers to also known as ratio chromatism, main
A secondary color chief ray for referring to object space becomes more light, hydrogen blue light in image side exit because there are dispersions for dioptric system
With the difference of focal position of the hydrogen feux rouges in image planes；
Referring to figure 4., Fig. 4 is the curvature of field and optical distortion figure of embodiment 1, wherein the curvature of field is for indicating different visual field points
Light beam picture point leave the change in location of image planes, the chief ray and image planes intersection point when optical distortion refers to a certain visual field dominant wavelength from
Open the vertical wheelbase of ideal image point from；
Referring to figure 5., Fig. 5 is the modulation transfer function figure of embodiment 1, wherein modulation transfer function (Modulation
Transfer Function, MTF) refer to relationship in modulation degree and image between every millimeter of demand pairs, for evaluating to scenery
Thin portion reducing power.
The second embodiment projection optical system design data is as shown in table 3 below:
Table 3
In embodiment 2, each parameter is as described below:
F1=-20.24；F2=-5.62；F3=6.94；F4=-15.52.So f1/f2=3.6；F2/f3=-0.45.
C1=1.27；C2=1.62；C3=0.98；C4=1.16.So, C1/C2=0.78；C3/C4=0.84.
A1=0.25；A2=1.07；A3=0.1；TTL=19.2, EFFL=9.4.
A1/A3=2.5；A2/TTL=0.056；EFFL/TTL=0.49.
Wherein, from object side to image side, the object side surface of first lens 10 is the face S1 11, and image side surface is the face S2 12；
The object side surface of second lens 20 is the face S3 21, and image side surface is the face S4 22；The object side surface of the third lens 30 is
The face S5 31, image side surface are the face S6 32；The object side surface of 4th lens 40 is the face S7 41, and image side surface is the face S8 42.A2,
A4, A8, A10, A12, A14, A16 are the aspherical high-order coefficient of non-spherical lens, specific as shown in table 4.
Table 4
| Surface number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| The face S1 | 5.2E-04 | 6.5E-05 | 1.3E-04 | -1.3E-05 | -3.6E-07 | 1.1E-07 | -5.3E-09 |
| The face S2 | 6.4E-04 | 3.4E-04 | 1.7E-04 | -2.0E-05 | -1.1E-06 | 2.8E-07 | -1.3E-08 |
| The face S3 | 1.9E-03 | -9.1E-05 | -1.1E-04 | 6.8E-06 | 4.1E-07 | -1.2E-08 | -1.1E-09 |
| The face S4 | -3.6E-03 | -2.0E-04 | -8.8E-05 | -1.2E-05 | 2.7E-06 | -7.9E-08 | -2.0E-09 |
| The face S5 | -1.3E-02 | -5.2E-04 | 2.6E-04 | -2.5E-05 | 3.6E-07 | 6.5E-08 | -2.8E-09 |
| The face S6 | -7.6E-03 | -5.0E-05 | -2.6E-05 | 3.0E-06 | 4.1E-07 | -6.7E-08 | 2.4E-09 |
| The face S7 | 1.9E-02 | -2.2E-03 | 9.1E-05 | -9.3E-07 | -3.0E-07 | 1.4E-08 | 2.8E-10 |
| The face S8 | 1.1E-02 | -9.2E-04 | -3.3E-06 | 5.6E-06 | -2.1E-07 | -4.3E-08 | 2.6E-09 |
Fig. 6 is please referred to, Fig. 6 is the axial spherical aberration figure of embodiment 2, wherein axial spherical aberration refers to edge-light in optical system
Line focus between paraxial focus at a distance from, for evaluating the image quality of object point on axis；
Fig. 7 is please referred to, Fig. 7 is the chromatic longitudiinal aberration figure of embodiment 2, wherein chromatic longitudiinal aberration refers to also known as ratio chromatism, main
A secondary color chief ray for referring to object space becomes more light, hydrogen blue light in image side exit because there are dispersions for dioptric system
With the difference of focal position of the hydrogen feux rouges in image planes；
Fig. 8 is please referred to, Fig. 8 is the curvature of field and optical distortion figure of embodiment 2, wherein the curvature of field is for indicating different visual field points
Light beam picture point leave the change in location of image planes, the chief ray and image planes intersection point when optical distortion refers to a certain visual field dominant wavelength from
Open the vertical wheelbase of ideal image point from；
Fig. 9 is please referred to, Fig. 9 is the modulation transfer function figure of embodiment 2, wherein modulation transfer function (Modulation
Transfer Function, MTF) refer to relationship in modulation degree and image between every millimeter of demand pairs, for evaluating to scenery
Thin portion reducing power.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. a kind of projection optical system, which is characterized in that the projection optical system includes the first microscope group, and first microscope group is used
In the illumination for improving the projection optical system, first microscope group is made of four lens subassemblies, sequentially by object side to image side
Are as follows:
The first lens with positive light coke, the object side surface of first lens are convex aspheric surface structure, and image side surface is recessed
Non-spherical structure；
The second lens with positive light coke, the object side surface of second lens are convex aspheric surface structure, and image side surface is convex
Non-spherical structure；
The third lens with negative power, the object side surface of the third lens are concave aspherical surface structure, and image side surface is convex
Non-spherical structure；
The 4th lens with positive light coke, the object side surface of the 4th lens are concave aspherical surface structure, and image side surface is convex
Non-spherical structure；
First lens, second lens, the third lens and the optical axis of the 4th lens is located at same
On straight line, and meet following relationship: 0.5 < f1/f2 < 25；-5<f3/f4<0；
Wherein, f1 is the focal length of first lens, and f2 is the focal length of second lens, and f3 is the coke of the third lens
Away from f4 is the focal length of the 4th lens.
2. projection optical system as described in claim 1, which is characterized in that the projection optical system meets following relationship:
0.2<C1/C2<2；0.2<C3/C4<2；
Wherein, C1 is the center thickness of first lens, and C2 is the center thickness of second lens, and C3 is that the third is saturating
The center thickness of mirror, C4 are the center thickness of the 4th lens.
3. projection optical system as described in claim 1, which is characterized in that the projection optical system meets following relationship: 1
<A1/A3<10；0.01<A2/TTL<0.1；0.2<EFFL/TTL<1；
Wherein, spacing distance of the A1 for the image side surface of first lens and the object side of second lens on optical axis, A2
For the spacing distance of the image side surface of second lens and the object side of the third lens on optical axis, A3 is that the third is saturating
Spacing distance of the object side of the image side surface of mirror and the 4th lens on optical axis, EFFL are the coke of the projection optical system
Away from TTL is the optics overall length of the projection optical system.
4. projection optical system as described in claim 1, which is characterized in that the projection optical system meets following relationship:
Vd1 >=55, Vd2 >=55, Vd3≤30, Vd4 >=55；
Wherein, the Vd1 is the Abbe number of first lens, and the Vd2 is the Abbe number of second lens, the Vd3
For the Abbe number of the third lens, the Vd4 is the Abbe number of the 4th lens.
5. projection optical system as claimed in claim 4, which is characterized in that first lens are cyclic olefin polymer.
6. projection optical system as claimed in claim 4, which is characterized in that second lens are cyclic olefin polymer.
7. projection optical system as claimed in claim 4, which is characterized in that the third lens are cyclic polyolefin resin.
8. projection optical system as claimed in claim 4, which is characterized in that the 4th lens are cyclic olefin polymer.
9. such as the described in any item projection optical systems of claim 1-8, which is characterized in that the projection optical system further includes
Diaphragm, right-angle prism, polarization splitting prism and image planes；Wherein, the diaphragm and the right-angle prism are set to first mirror
Group is set to first microscope group close to the image side close to the side of the object side, the polarization splitting prism and the image planes
Side；
Light enters the right-angle prism after passing through from the diaphragm, and after the slant reflection of the right-angle prism described in injection
Right-angle prism, into first microscope group, the light that is projected from first microscope group after the polarization splitting prism to
Up to the image planes.
10. a kind of augmented reality glasses, which is characterized in that the augmented reality glasses include projection as claimed in claim 9
Optical system.
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| CN201811616806.8A CN109491049B (en) | 2018-12-26 | 2018-12-26 | Projection optical system and augmented reality glasses having same |
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