CN209728334U

CN209728334U - Optical system and virtual reality device with it

Info

Publication number: CN209728334U
Application number: CN201920627906.4U
Authority: CN
Inventors: 孙琦
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2019-12-03
Anticipated expiration: 2029-04-30

Abstract

The utility model discloses a kind of optical system and the virtual reality device with it, the optical system successively includes display unit, the first lens, first phase delayer, the second lens and diaphragm along light transmission direction, first lens include first surface and second surface, and second lens include third surface and the 4th surface；The incident ray that the display unit issues is transmitted to the 4th surface from the first surface, pass through the reflection of polarization film and the first phase delayer on the 4th surface, between the second surface and the 4th surface multiple reflections occur for the incident ray, and the transformation of multiple polarization state or polarization direction occurs, finally it is transmitted to the diaphragm.The utility model provides a kind of optical system and the virtual reality device with it, solves in the prior art since optical system volume is larger, causes the volume of virtual reality device larger, the low problem of the comfort level that user wears.

Description

Optical system and virtual reality device with it

Technical field

The utility model relates to optical image technology field more particularly to a kind of optical system and with its virtual reality Equipment.

Background technique

With the development of virtual reality technology, the form and type of virtual reality device are also increasingly various, and application neck Also further extensively, the display screen in equipment is usually passed through the transmitting and amplification of optical system by current virtual reality device in domain Afterwards, the image of output is transferred to human eye, therefore what human eye received is display screen by the amplified virtual image, to pass through void Quasi- real world devices realize the purpose of large-size screen monitors viewing, and in order to realize the amplification of image, optical system usually requires multiple lens groups The mode of conjunction is realized, since volume is larger when multiple lens combinations use, and then is caused the volume of virtual reality device larger, is dropped The comfort level that low user wears.

Utility model content

The utility model provides a kind of optical system and the virtual reality device with it, it is intended to solve in the prior art by It is larger in optical system volume, cause the volume of virtual reality device larger, the low problem of the comfort level that user wears.

To achieve the above object, the utility model proposes a kind of optical system, the optical system includes along optical axis side To the display unit set gradually, the first lens, first phase delayer, the second lens and diaphragm,

First lens include close to the first surface of the side of the display unit and far from the display unit Side second surface, the second surface be equipped with spectro-film；

Second lens include close to the third surface of the side of first lens and far from first lens Side the 4th surface, the 4th surface be equipped with reflection of polarization film；

The display unit to the 4th surface center distance be less than or equal to 18mm；

The incident ray that the display unit issues after first lens, successively on the 4th surface and The second surface reflects, and projects second lens from the 4th surface, is transmitted to the diaphragm.

Optionally, it is inclined to become First Line after first lens and the first phase delayer for the incident ray Shake light, and the incident ray is reflected by the second surface, inclined by becoming the second line after the first phase delayer Shake light；

The polarization direction of first linearly polarized light is identical as the reflection direction of the reflection of polarization film, and second line is inclined The polarization direction of vibration light is identical as the transmission direction of the reflection of polarization film.

Optionally, the first phase delayer is quarter wave plate.

Optionally, the optical system meets following relationship: 50mm≤ABS (R1)≤100mm；200mm≤ABS(R2)≤ 500mm；

Wherein, the R1 is the radius of curvature of the second surface, and the R2 is the radius of curvature on the 4th surface.

Optionally, the optical system meets following relationship: 15mm≤T1≤20mm；12.5mm≤T2≤15mm；

Wherein, the T1 be the display unit center to the 4th surface center distance, the T2 is institute The center on the 4th surface is stated to the distance at the center of the diaphragm.

Optionally, the optical system meets following relationship: 0.5mm≤L1；3mm≤L2≤8mm；2mm≤L3≤6mm； 3mm≤L4≤8mm；

Wherein, the L1 is the center of the display unit to the distance at the center of the first surface, and the L2 is institute State the center thickness of the first lens；The L3 be the second surface center to the third surface center distance, institute State the center thickness that L4 is second lens.

Optionally, the optical system meets following relationship: 0.02≤L1/T1≤0.1；0.3≤L2/T1≤0.4；0.3 ≤L3/T1≤0.5；0.3≤L4/T1≤0.5；

Wherein, the L1 is the center of the display unit to the distance at the center of the first surface, and the L2 is institute State the center thickness of the first lens；The L3 be the second surface center to the third surface center distance, institute State the center thickness that L4 is second lens；The T1 is the center of the display unit to the center on the 4th surface Distance.

Optionally, the optical system meets following relationship: 2*f≤f2≤5*f；5*f≤f1≤10*f；10mm≤f≤ f2≤f1；1≤f/T1≤1.5；

Wherein, the f is the whole focal length of the optical system, and the f1 is the focal length of first lens, the f2 For the focal length of second lens, the T1 be the display unit center to the 4th surface center distance.

Optionally, the optical system further includes second phase delayer, and it is single that second delayer is set to the display It is first between first lens.

To achieve the above object, the application proposes a kind of virtual reality device, which is characterized in that the virtual reality device Including the optical system as described in any of the above-described embodiment.

In the technical solution that the application proposes, the optical system successively includes display unit, the along light transmission direction One lens, first phase delayer, the second lens and diaphragm, the incident ray that the display unit issues successively pass through described Become the first linearly polarized light after first lens, the first phase delayer, first linearly polarized light passes through the third table Reflection direction and first linear polarization when face is transmitted to four surface, due to the reflection of polarization film on the 4th surface The polarization direction of light is identical, and first linearly polarized light reflects on the 4th surface, again passes by the first phase After delayer, first linearly polarized light is changed into the first circularly polarized light, and first circularly polarized light is sent out in the second surface Raw reflection, first circularly polarized light become the second circularly polarized light, and the rotation of second circularly polarized light and first circle are inclined The rotation of vibration light is on the contrary, second circularly polarized light is becoming the second linearly polarized light, institute after the first phase delayer The polarization direction of the polarization direction and first linearly polarized light of stating the second linearly polarized light is mutually perpendicular to, and with the reflection of polarization The transmission direction of film is identical, therefore second linearly polarized light is when being transmitted to four surface, saturating from the 4th surface It crosses and is transmitted to the diaphragm.Between first lens and second lens two secondary reflections occur for the incident ray, Light path of the incident ray in the optical system is increased by way of reflection, to reduce the optical system Volume, and then reduce the volume of the virtual reality device, it solves to lead to void in the prior art since optical system volume is larger The volume of quasi- real world devices is larger, the low problem of the comfort level that user wears.

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 light path schematic diagram that the utility model optical system unifies embodiment；

Fig. 2 is the light path schematic diagram of the another embodiment of the utility model optical system；

Fig. 3 is the point range figure of the utility model optical system；

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

Fig. 5 is the chromatic longitudiinal aberration figure of the utility model optical system.

Drawing reference numeral explanation:

Label	Title	Label	Title
				10	Display unit	31	Third surface
20	First lens	32	4th surface
				21	First surface	40	Diaphragm
22	Second surface	50	Second phase delayer
				30	Second lens

The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.

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 optical system and the virtual reality device with it.

Please refer to Fig. 1, the optical system include the display unit 10 set gradually along optical axis direction, the first lens 20, First phase delayer (not shown), the second lens 30 and diaphragm 40,

First lens 20 include close to the first surface 21 of the side of second lens 30 and far from described the The second surface 22 of the side of two lens 30, the second surface 22 are equipped with spectro-film；

Second lens 30 include close to the third surface 31 of the side of first lens 20 and far from described the 4th surface 32 of the side of one lens 20, the 4th surface 32 are equipped with reflection of polarization film；

The distance that the display unit 10 arrives the center on the 4th surface is less than or equal to 18mm；

The incident ray that the display unit 10 issues is after first lens 20, successively on the 4th surface 32 and the second surface 22 reflect, and project second lens 30 from the 4th surface 32, be transmitted to described Diaphragm 40.

In specific embodiment, incident ray that the display unit 10 issues enters described the from the first surface 21 One lens 20, and first lens 20 are projected from the second surface 22, the incident ray is passing through the first phase Becoming the first linearly polarized light after delayer, first linearly polarized light enters second lens 30 from the third surface 31, And after the reflection of the 4th surface 32, second lens 30, first linearly polarized light are projected from the third surface 31 Becoming the first circularly polarized light after the first phase delayer, first circularly polarized light is anti-in the second surface 22 Penetrating becomes the second circularly polarized light, and the rotation of second circularly polarized light and first circularly polarized light is on the contrary, second circle is inclined Vibration light, which again passes by, becomes the second linearly polarized light after the first phase delayer, and second linearly polarized light is by described the After three surfaces 31 enter the second lens 30, second lens 30 are projected from the 4th surface 32, and be transmitted to the diaphragm 40。

Preferably, the spectro-film can be set to the second surface 22 by way of plated film or attaching, similarly, described Reflection of polarization film can be set to the 4th surface 32 by way of plated film or attaching, and further, the spectro-film is half anti- Semi-permeable membrane, the transmissivity of the part reflective semitransparent film and the ratio of reflectivity are 1:1, it is to be understood that the spectro-film light splitting Ratio is without being limited thereto, and in other embodiments, the transmissivity of the spectro-film and the ratio of reflectivity can also be 4:6 or 3: 7。

In the technical solution that the application proposes, it successively includes display unit that the optical system, which includes along light transmission direction, 10, the first lens 20, first phase delayer, the second lens 30 and diaphragm 40, the incident light that the display unit 10 issues Line successively becomes the first linearly polarized light, first linear polarization after first lens 20, the first phase delayer Light by the third surface 31 be transmitted to four surface 32 when, due to the 4th surface 32 reflection of polarization film it is anti- It is identical as the polarization direction of first linearly polarized light to penetrate direction, first linearly polarized light occurs instead on the 4th surface 32 It penetrates, after again passing by the first phase delayer, first linearly polarized light is changed into the first circularly polarized light, first circle Polarised light is reflected in the second surface 22, and first circularly polarized light becomes the second circularly polarized light, and second circle is inclined The rotation of light and the rotation of first circularly polarized light shake on the contrary, second circularly polarized light postpones by the first phase Become the second linearly polarized light, the polarization direction phase of the polarization direction of second linearly polarized light and first linearly polarized light after device It is mutually vertical and identical as the transmission direction of the reflection of polarization film, therefore second linearly polarized light is being transmitted to the described 4th When surface 32, is penetrated from the 4th surface 32 and be transmitted to the diaphragm 40.The incident ray is in first lens 20 Two secondary reflections occur between second lens 30, the incident ray is increased by way of reflection in the optical system Light path in system to reduce the volume of the optical system, and then reduces the volume of the virtual reality device, solves existing Since optical system volume is larger in technology, cause the volume of virtual reality device larger, the comfort level that user wears is low to ask Topic.

Preferably, the first phase delayer is the first quarter wave plate, the central wavelength of first quarter wave plate and institute The wavelength for stating incident ray is equal.

In some alternative embodiments, the reflection direction of the reflection of polarization film and first linearly polarized light is inclined Shaking, direction is identical, and the transmission direction of the reflection of polarization film is identical as the polarization direction of second linearly polarized light.Specifically, working as When the polarization direction of the reflection direction of the reflection of polarization film and first linearly polarized light is not identical, first linearly polarized light It is reflected by will appear fractional transmission part when the reflection of polarization film, to reduce the transmitting of first linearly polarized light Efficiency will cause in addition, the transmissive portion of first linearly polarized light and second linearly polarized light are transmitted to the diaphragm 40 There is ghost image in the image that user observes, influences the observation experience of user.When the reflection of polarization film transmission direction with it is described When the transmission direction of second linearly polarized light is not identical, the transmitance of second linearly polarized light can be reduced, to enter described in reducing Penetrate transmission efficiency of the light in the optical system.

In some alternative embodiments, the optical system meets following relationship: 50mm≤ABS (R1)≤100mm； The R1 is the radius of curvature of the second surface 22.Wherein, when the second surface 22 is aspherical, the second surface 22 radius of curvature is the radius of curvature of aspheric vertex of surface.

In some alternative embodiments, the optical system meets following relationship: 200mm≤ABS (R2)≤ 500mm；The R2 is the radius of curvature on the 4th surface 32.Wherein, when the 4th surface 32 is aspherical, described the The radius of curvature on four surfaces 32 is the radius of curvature of aspheric vertex of surface.

In some alternative embodiments, the center vertical line of the display unit 10, first lens 20 optical axis, The center vertical line of the optical axis of second lens 30, the optical axis of the first phase delayer and the diaphragm 40 is conllinear.Institute It states optical system and meets following relationship: 15mm≤T1≤20mm；12.5mm≤T2≤15mm；The T1 is the display unit 10 Center to the 4th surface 32 center distance, the T2 is the center on the 4th surface 32 to the diaphragm 40 The distance at center.

In some alternative embodiments, the optical system meets following relationship: 0.5mm≤L1；3mm≤L2≤ 8mm；2mm≤L3≤6mm；3mm≤L4≤8mm；The L1 is the center of the display unit 10 to the first surface 21 The distance at center, the L2 are the center thickness of first lens 20；The L3 for the second surface 22 center to institute The distance at the center on third surface 31 is stated, the L4 is the center thickness of second lens 30.

In some alternative embodiments, the optical system meets following relationship: 0.02≤L1/T1≤0.1；0.3 ≤L2/T1≤0.4；0.3≤L3/T1≤0.5；0.3≤L4/T1≤0.5；The L1 for the display unit 10 center to institute The distance at the center of first surface 21 is stated, the L2 is the center thickness of first lens 20；The L3 is second table The center in face 22 to the third surface 31 center distance, the L4 be second lens 30 center thickness；It is described T1 be the display unit 10 center to the 4th surface 32 center distance, the T2 is the 4th surface 32 Distance of the center to the center of the diaphragm 40.

In some alternative embodiments, the optical system meets following relationship: 2*f≤f2≤5*f；5*f≤f2 ≤10*f；10mm≤f≤f2≤f1；1≤f/T1≤1.5；The f is the whole focal length of the optical system, and the f1 is institute The focal length of the first lens 20 is stated, the f2 is the focal length of second lens 30, and the T1 is the center of the display unit 10 To the distance at the center on the 4th surface 32.

Referring to figure 2., in some alternative embodiments, when the incident ray that the display unit 20 issues is that line is inclined When vibration light, the optical system further includes second phase delayer 50, and it is single that the second phase delayer 50 is set to the display Between member 10 and first lens 20, the incident ray for issuing the display unit 10 changes from linearly polarized light For circularly polarized light.Preferably, the second phase delayer be the second quarter wave plate, the central wavelength of second quarter wave plate with The wavelength of the incident ray is equal.

In some alternative embodiments, the first surface 21 is aspherical with the third surface 31.It is specific real It applies in mode, non-spherical structure can effectively reduce the spherical aberration and distortion of the optical system compared to spherical structure, thus Reduce the number of lens and the size of reduction lens in the optical system.

In some alternative embodiments, the diaphragm 40 passes through for controlling light, adjusts and projects the optical system The luminous flux of system, while reducing the interference of stray light that other lenses are generated by reflection.

In the first embodiment, Optical System Design data are as shown in table 1 below:

Table 1

In the first embodiment, each parameter is as described below:

ABS (R1)=86.87mm, ABS (R2)=300mm；

F1=1144.32mm, f2=89.98mm, f=24.11mm；

T2=13.0mm, T1=18.0mm；

L1=0.4999mm, L2=5.6060mm, L3=5.6129mm, L4=6.2813mm；

So L1/T1=0.0278, L2/T1=0.3114, L3/T1=0.3118, L4/T1=0.3490；

Wherein, the second surface 22 and the 4th surface 32 can be even aspheric surface structure, wherein the even It is aspherical to meet following relationship:

Wherein, Y is mirror surface centre-height, and it along optical axis direction is highly being the position of Y that Z, which is non-spherical structure, is pushed up with surface Point is made to refer to the shift value away from optical axis, and C is aspherical vertex curvature radius, and K is circular cone coefficient；The aspheric of α i expression i-th Face coefficient.

In another embodiment, the second surface 22 and the 4th surface 32 or odd times non-spherical structure, Wherein, the odd times are aspherical meets following relationship:

Wherein, Y is mirror surface centre-height, and it along optical axis direction is highly being the position of Y that Z, which is non-spherical structure, is pushed up with surface Point is made to refer to the shift value away from optical axis, and C is aspherical vertex curvature radius, and K is circular cone coefficient；The aspheric of β i expression i-th Face coefficient.

Referring to figure 3., Fig. 3 is the point range figure of first embodiment, and wherein point range figure refers to many light issued by any After optical system, because aberration makes the intersection point of itself and image planes no longer concentrate on same point, and forms one and be dispersed in certain model The dispersion pattern enclosed, for evaluating the image quality of the projection optical system.In the first embodiment, the point range figure The maximum value of middle picture point is corresponding with maximum field of view, and the maximum value of picture point is less than 30 μm in the point range figure.

Referring to figure 4., Fig. 4 is the curvature of field and optical distortion figure of first embodiment, wherein the curvature of field is for indicating different visual fields The light beam picture point of point leaves the change in location of image planes, and optical distortion refers to the chief ray and image planes intersection point when a certain visual field dominant wavelength Leave the vertical wheelbase of ideal image point from；In the first embodiment, the curvature of field of tangent plane and sagittal surface be respectively less than ± 1mm, and the maximum field Qucha of tangent plane and sagittal surface is different less than 0.5mm, wherein maximum distortion is maximum distortion at maximum field of view < 30%.

Referring to figure 5., Fig. 5 is the chromatic longitudiinal aberration figure of first embodiment, wherein chromatic longitudiinal aberration refers to also known as multiplying power color Difference is primarily referred to as a secondary color chief ray of object space, because there are dispersions for dioptric system, becomes more light in image side exit, The difference of hydrogen blue light and focal position of the hydrogen feux rouges in image planes；In the first embodiment, the maximum of the optical system Dispersion is the visual field maximum position of the optical system, and the maximum aberration value of the optical system is less than 242.34 μm, after cooperation The software correction of phase can be met the needs of users.

In the first embodiment, 32 length of the 4th surface of the display unit 10 to second lens 30 is 18mm, maximum field of view angle is 100 degree, and the spot size of the maximum field of view of the optical system is less than 30 μm, to guarantee Can blur-free imaging reduce the optical system by way of folding optical path under the premise of meeting user's viewing experience Volume improve the usage experience of user to reduce the volume and weight of the virtual reality device.

The utility model also proposes that a kind of virtual reality device, the virtual reality device include such as any of the above-described embodiment party Optical system described in formula, the specific structure of the optical system is referring to above-described embodiment, since the optical system is using above-mentioned Whole technical solutions of all embodiments, thus it is at least all beneficial to effect brought by the technical solution with above-described embodiment Fruit, this is no longer going to repeat them.

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

1. a kind of optical system, which is characterized in that the optical system includes the display unit set gradually along optical axis direction, One lens, first phase delayer, the second lens and diaphragm,

First lens include the first surface close to the side of the display unit and one far from the display unit The second surface of side, the second surface are equipped with spectro-film；

Second lens include the third surface close to the side of first lens and one far from first lens 4th surface of side, the 4th surface are equipped with reflection of polarization film；

The incident ray that the display unit issues is after first lens, successively on the 4th surface and described Second surface reflects, and projects second lens from the 4th surface, is transmitted to the diaphragm.

2. optical system as described in claim 1, which is characterized in that the incident ray by first lens with it is described Becoming the first linearly polarized light after first phase delayer, the incident ray is reflected by the second surface, again by Become the second linearly polarized light after the first phase delayer；

The polarization direction of first linearly polarized light is identical as the reflection direction of the reflection of polarization film, second linearly polarized light Polarization direction it is identical as the transmission direction of the reflection of polarization film.

3. such as the described in any item optical systems of claims 1 or 2, which is characterized in that the first phase delayer is 1/4 wave Piece.

4. optical system as described in claim 1, which is characterized in that the optical system meets following relationship: 50mm≤ABS (R1)≤100mm；200mm≤ABS(R2)≤500mm；

5. optical system as described in claim 1, which is characterized in that the optical system meets following relationship: 15mm≤T1 ≤20mm；12.5mm≤T2≤15mm；

Wherein, the T1 be the display unit center to the 4th surface center distance, the T2 is described the Distance of the center on four surfaces to the center of the diaphragm.

6. optical system as described in claim 1, which is characterized in that the optical system meets following relationship: 0.5mm≤ L1；3mm≤L2≤8mm；2mm≤L3≤6mm；3mm≤L4≤8mm；

Wherein, the L1 is that the distance at the center of the first surface is arrived at the center of the display unit, and the L2 is described the The center thickness of one lens；The L3 be the second surface center to the third surface center distance, the L4 For the center thickness of second lens.

7. optical system as described in claim 1, which is characterized in that the optical system meets following relationship: 0.02≤L1/ T1≤0.1；0.3≤L2/T1≤0.4；0.3≤L3/T1≤0.5；0.3≤L4/T1≤0.5；

Wherein, the L1 is that the distance at the center of the first surface is arrived at the center of the display unit, and the L2 is described the The center thickness of one lens；The L3 be the second surface center to the third surface center distance, the L4 For the center thickness of second lens；The T1 be the display unit center to the 4th surface center away from From.

8. optical system as described in claim 1, which is characterized in that the optical system meets following relationship: 2*f≤f2≤ 5*f；5*f≤f1≤10*f；10mm≤f≤f2≤f1；1≤f/T1≤1.5；

Wherein, the f is the whole focal length of the optical system, and the f1 is the focal length of first lens, and the f2 is institute State the focal length of the second lens, the T1 be the display unit center to the 4th surface center distance.

9. optical system as described in claim 1, which is characterized in that the optical system further includes second phase delayer, The second phase delayer is set between the display unit and first lens.

10. a kind of virtual reality device, which is characterized in that the virtual reality device includes such as any one of claim 1-9 institute The optical system stated.