CN209167651U - Projection optical system and augmented reality glasses with it - Google Patents

Abstract

The utility model discloses a kind of projection optical system and the augmented reality glasses with it, the projection optical system includes the first microscope group, first microscope group is made of four lens, 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 are non-spherical structure.In addition the focal length of first lens and second lens meets relationship 0.5 < f1/f2 < 25；The focal length of the third lens and the 4th lens meets relationship -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 focal length of the third lens, and f4 is the focal length of the 4th lens.The utility model provides a kind of projection optical system and the augmented reality glasses with it, it is intended to which projection optical system volume is excessive in the prior art for solution, the low problem of projection optical system illumination.

Description

Projection optical system and augmented reality glasses with it

Technical field

The utility model relates to projection imaging field more particularly to a kind of projection optical system and with its augmented reality Glasses.

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.

Utility model content

The main purpose of the utility model is to provide a kind of projection optical system and the augmented reality glasses with it, it is intended to It is excessive to solve projection optical system volume in the prior art, the low problem of projection optical system illumination.

To achieve the above object, the utility model proposes a kind of projection optical system, the projection optical system includes the One microscope group, first microscope group are used to improve the illumination of the projection optical system, and first microscope group is by four lens subassemblies Composition, 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 Face structure, image side surface are concave aspherical surface structure；The object side surface of the second lens with positive light coke, second lens is Convex aspheric surface structure, image side surface are convex aspheric surface structure；The third lens with negative power, the object side of the third lens Surface is concave aspherical surface structure, and image side surface is convex aspheric surface structure；The 4th lens with positive light coke, the 4th lens Object side surface be concave aspherical surface structure, image side surface be convex aspheric surface structure；First lens, second lens, institute It states the third lens and is located on the same line the optical axis of the 4th lens, 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 third The focal length of lens, f4 are the focal length of the 4th lens.

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.

The utility model proposes technical solution in, the projection optical system include the first microscope group, first microscope group It is made of four lens, sequentially by object side to image side are as follows: the first lens with positive light coke, second with positive light coke are thoroughly Mirror, the third lens with negative power and the 4th lens with positive light coke, the object side surface and image side of four lens Surface is non-spherical structure.In addition the focal length of first lens and second lens meets relationship 0.5 < f1/f2 < 25； The focal length of the third lens and the 4th lens meets relationship -5 < f3/f4 < 0.In compared with the prior art using five pieces or The projection optical system that five pieces or more of lens combination is formed, first microscope group are combined by four lens, effectively The size for reducing projection optical system reduces turnover number of the light in optical system, solves existing projection optics System dimension is larger, and the problem for causing projection optical system illumination low.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.

Fig. 1 is the structural schematic diagram of the utility model projection optical system；

Fig. 2 is the axial spherical aberration figure of the utility model embodiment 1；

Fig. 3 is the chromatic longitudiinal aberration figure of the utility model embodiment 1；

Fig. 4 is the curvature of field and optical distortion figure of the utility model embodiment 1；

Fig. 5 is the modulation transfer function figure of the utility model embodiment 1；

Fig. 6 is the axial spherical aberration figure of the utility model embodiment 2；

Fig. 7 is the chromatic longitudiinal aberration figure of the utility model embodiment 2；

Fig. 8 is the curvature of field and optical distortion figure of the utility model embodiment 2；

Fig. 9 is the modulation transfer function figure of the utility model embodiment 2.

Drawing reference numeral explanation:

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, fall within the protection scope of the utility model.

It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute in the utility model embodiment It is only used for explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, such as When the fruit 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 cannot manage Solution is its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " the One ", the feature of " second " can explicitly or implicitly include at least one of the features.It is " more in the description of the present invention, It is a " it is meant that 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. should do broad sense reason Solution, for example, " fixation " may be a fixed connection, may be a detachable connection, or integral；It can be mechanical connection, it can also To be electrical connection；It can be directly connected, the connection inside two elements can also be can be indirectly connected through an intermediary Or the interaction relationship of two elements, unless otherwise restricted clearly.It for the ordinary skill in the art, can be with The concrete meaning of above-mentioned term in the present invention is understood as the case may be.

It in addition, the technical solution between each embodiment of the utility model can be combined with each other, but must be with ability Based on domain those of ordinary skill can be realized, it will be understood that when the combination of technical solution appearance is conflicting or cannot achieve The combination of this technical solution is not present, also not within the protection scope of the requires of the utility model.

The utility model 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.

The utility model proposes technical solution in, the projection optical system include the first microscope group 100, first mirror Group 100 is 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 The second lens 20, the third lens 30 with negative power and the 4th lens 40 with positive light coke, four lens Object side surface and image side surface are non-spherical structure.In addition the focal length of first lens 10 and second lens 20 meets Relationship 0.5 < f1/f2 < 25；The third lens 30 and the focal length of the 4th lens 40 meet relationship -5 < f3/f4 < 0.It compares In the projection optical system for using five pieces or five pieces or more of lens combination to be formed in the prior art, first microscope group 100 is logical It crosses four lens to be combined, efficiently reduces the size of projection optical system, reduce light and turn in optical system Number is rolled over, 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 is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model, It is all under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.

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.