CN212846180U - Optical system and virtual reality equipment - Google Patents
Optical system and virtual reality equipment Download PDFInfo
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- CN212846180U CN212846180U CN202021510958.2U CN202021510958U CN212846180U CN 212846180 U CN212846180 U CN 212846180U CN 202021510958 U CN202021510958 U CN 202021510958U CN 212846180 U CN212846180 U CN 212846180U
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Abstract
The utility model discloses an optical system and virtual reality equipment, optical system includes in proper order along light transmission direction: a display unit, a flat glass and a first lens; the optical system further comprises a light splitter, and the light splitter is arranged on one side, close to the display unit, of the flat glass or between the flat glass and the first lens; the optical system further comprises a first phase retarder and a polarization reflector, and the polarization reflector is arranged between the first lens and the first phase retarder. The utility model provides an optical system and virtual reality equipment aims at solving among the prior art stress in the optical plastic lens and produces the influence to the polarization state of light to produce stray light, influence the user and carry out the problem of observing to the formation of image picture.
Description
Technical Field
The utility model relates to an imaging technology field especially relates to an optical system and virtual reality equipment.
Background
With the development of virtual reality technology, the forms and the types of virtual reality equipment are increasingly diversified, and the application fields are increasingly wide, and in order to reduce the volume of the virtual reality equipment, the current virtual reality equipment can apply the principle of polarized reflection of light in the prior art, and adopts a mode of folding a light path to realize the design of an optical system with a large view field and a small volume by means of light reflection and the change of the polarization state of the light.
Because of the internal stress existing in the optical lens, in the folded light path, the internal stress of the optical lens easily causes the polarization state of the polarized light passing through the optical lens to change, so that the polarization degree of the light is reduced, and the generated stray light is emitted out of the optical system to influence the observation of a user on an imaging picture.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model provides an optical system and virtual reality equipment aims at solving among the prior art stress in the optical plastic lens and produces the influence to the polarization state of light to produce stray light, influence the user and carry out the problem of observing to the formation of image picture.
In order to achieve the above object, the present invention provides an optical system, which comprises in order along a light transmission direction: a display unit, a flat glass and a first lens;
the optical system further comprises a light splitter, and the light splitter is arranged on one side, close to the display unit, of the flat glass or between the flat glass and the first lens;
the optical system further comprises a first phase retarder and a polarization reflector, the first phase retarder is arranged between the first lens and the flat glass, and the polarization reflector is arranged between the first lens and the first phase retarder.
Optionally, the light incident surface of the first lens is of a concave structure, and the light emergent surface of the first lens is of a convex structure.
Optionally, the optical system satisfies the following relationship:
40mm<ABS(R1)<45mm；ABS(Conic1)<5；
wherein R1 is a radius of curvature of the first lens, ABS (R1) is an absolute value of R1, Conic1 is a Conic coefficient of the first lens, and ABS (Conic1) is an absolute value of Conic 1.
Optionally, the optical system satisfies the following relationship:
50mm<ABS(R2)<60mm；ABS(Conic2)<5；
wherein R2 is a radius of curvature of the first lens, ABS (R2) is an absolute value of R2, Conic2 is a Conic coefficient of the first lens, and ABS (Conic2) is an absolute value of Conic 2.
Optionally, the optical system satisfies the following relationship:
5mm<T1<10mm；
wherein the T1 is a center thickness of the first lens.
Optionally, the optical system satisfies the following relationship:
5mm<L1<8mm；
the L1 is a distance between the light incident surface of the first lens and a surface of the flat glass on a side close to the first lens.
Optionally, the optical system satisfies the following relationship:
15mm<L2<20mm；
the L2 is a distance between a surface of the first lens on a side close to the display unit and a light-emitting surface of the display unit.
Optionally, the optical system further includes a second phase retardation plate disposed between the display unit and the beam splitter.
Optionally, the optical system further includes a polarizing plate, and the polarizing plate is disposed between the first lens and the polarizing reflector or disposed on the light exit surface of the first lens.
In order to achieve the above object, the present application provides a virtual reality device, which includes a housing and an optical system as described in any one of the above embodiments, where the optical system is accommodated in the housing.
In the technical scheme that this application provided, optical system includes in proper order along light transmission direction: the optical system further comprises a light splitter, and the light splitter is arranged on one side, close to the display unit, of the flat glass or between the flat glass and the first lens; the optical system further comprises a first phase retarder and a polarization reflector, and the polarization reflector is arranged between the first lens and the first phase retarder. After the light rays emitted by the display unit penetrate through the plate glass, the light splitting film is arranged on one side surface, close to the first lens, of the plate glass, the polarization reflector plate is arranged on one side surface, close to the plate glass, of the first lens, and therefore the light rays are guaranteed to be turned back in an air gap between the plate glass and the first lens, and therefore the problem that the light rays enter the first lens, stress in the optical lens influences the polarization state of the light rays, stray light is generated, and the user is influenced to observe an imaging picture is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical system according to the present invention;
fig. 2 is a schematic diagram of the optical path of the optical system of the present invention;
fig. 3 is a point diagram of the first embodiment of the present invention;
fig. 4 is a graph of field curvature and optical distortion according to a first embodiment of the present invention;
fig. 5 is a vertical axis color difference diagram according to the first embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
30 | |
| 20 | |
40 | Polarizing plate |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The utility model provides an optical system and virtual reality equipment.
Referring to fig. 1, the optical system sequentially includes, along a light transmission direction: a display unit 10, a plate glass 20, and a first lens 30;
the optical system further comprises a light splitter, wherein the light splitter is arranged on one side of the flat glass 20 close to the display unit 10 or between the flat glass 20 and the first lens 30;
the optical system further includes a first phase retarder and a polarizing reflector, and the polarizing reflector is disposed between the first lens 30 and the first phase retarder. It can be understood that the phase retarder and the polarization reflector may be planar structures and disposed perpendicular to the optical axis of the first lens 30, and may also be attached to or coated on the light incident surface of the first lens 30.
Specifically, the polarization reflector plate comprises a transmission direction and a reflection direction, when light is transmitted to the polarization reflector plate, part of the light with the polarization direction being the same as the transmission direction of the polarization reflector plate in the light penetrates through the polarization reflector plate, and part of the light with the polarization direction being the same as the reflection direction of the polarization reflector plate in the light is reflected by the polarization reflector plate.
In a preferred embodiment, the optical splitter may be a spectroscopic film or an optical splitter, and when the optical splitter is a spectroscopic film, the spectroscopic film may be disposed on the first surface by a plating or attaching method, and similarly, the polarization reflective film may be disposed on the first surface by a plating or attaching method, and further, the spectroscopic film is a transflective film, and a ratio of transmittance to reflectance of the transflective film is 1:1, it is understood that a light splitting ratio of the spectroscopic film is not limited thereto, and in other embodiments, a ratio of transmittance to reflectance of the spectroscopic film may also be 4:6 or 3: 7.
In the technical scheme that this application provided, optical system includes in proper order along light transmission direction: the optical system further comprises a light splitter, wherein the light splitter is arranged on one side of the flat glass 20 close to the display unit 10 or between the flat glass 20 and the first lens 30; the optical system further includes a first phase retarder and a polarizing reflector, and the polarizing reflector is disposed between the first lens 30 and the first phase retarder. After the light emitted by the display unit 10 penetrates through the plate glass 20, because the light splitting film is arranged on one side surface of the plate glass 20 close to the first lens 30, and the polarization reflector is arranged on one side surface of the first lens 30 close to the plate glass 20, the light is ensured to be folded back in an air gap between the plate glass 20 and the first lens 30, so that the problem that the polarization state of the light is influenced by stress in the optical lens after the light enters the first lens 30, stray light is generated, and the observation of an imaging picture by a user is influenced is solved.
In a preferred embodiment, the light incident surface of the first lens 30 is a concave surface structure, and the light emitting surface of the first lens 30 is a convex surface structure. Specifically, light is in during the income plain noodles of first lens 30 reflects, because the income plain noodles of first lens 30 is the concave surface structure, and consequently light is in have positive focal power when the income plain noodles of first lens 30 reflects, can be right light focuses on, and when light sees through during the income plain noodles of first lens 30, the income plain noodles of first lens 30 has negative focal power, light passes through during the exit surface of first lens 30, because the exit surface of first lens 30 is convex surface structure, consequently light sees through during the exit surface of first lens 30, the exit surface of first lens 30 has positive focal power.
In an alternative embodiment, the optical system satisfies the following relationship:
40mm<ABS(R1)<45mm；ABS(Conic1)<5；
wherein the R1 is a radius of curvature of the first lens 30, the ABS (R1) is an absolute value of the R1, and the Conic1 is a Conic coefficient of the first lens 30. The ABS (Conic1) is the absolute value of the Conic 1.
Specifically, the curvature radius is used to represent the degree of curve curvature, and the conic coefficient is used to represent an aspheric conic coefficient in a surface function of an aspheric structure.
In an alternative embodiment, the optical system satisfies the following relationship:
50mm<ABS(R2)<60mm；ABS(Conic2)<5；
wherein the R2 is a radius of curvature of the first lens 30, the ABS (R2) is an absolute value of the R2, and the Conic2 is a Conic coefficient of the first lens 30. The ABS (Conic2) is the absolute value of the Conic 2. Specifically, the curvature radius is used to represent the degree of curve curvature, and the conic coefficient is used to represent an aspheric conic coefficient in a surface function of an aspheric structure.
In an alternative embodiment, the optical system satisfies the following relationship:
5mm<T1<10mm；
the T1 is a central thickness of the first lens 30, and the central thickness of the first lens 30 is a thickness of a central position of the first lens 30 along an optical axis direction.
In an alternative embodiment, the optical system satisfies the following relationship:
5mm<L1<8mm；
the L1 is a distance between the light incident surface of the first lens 30 and a surface of the flat glass 20 on a side close to the first lens 30.
In an alternative embodiment, the optical system satisfies the following relationship:
15mm<L2<20mm；
the L2 is a distance between a surface of the first lens 30 on a side close to the display unit 10 and a light exit surface of the display unit 10.
In an optional embodiment, the optical system further includes a second phase retardation plate, which is disposed between the display unit 10 and the beam splitter, specifically, when the light emitted from the display unit 10 is linearly polarized light, in order to ensure that the light can be reflected in the optical system, the second phase retardation plate is disposed between the display unit 10 and the first lens 30, so that the linearly polarized light emitted from the display unit 10 is changed into circularly polarized light after passing through the second phase retardation plate, and the light can be changed into the first linearly polarized light after passing through the first phase retardation plate and reflected by the reflective polarizer 40. In a preferred embodiment, the second phase retardation plate is an 1/4 wave plate, and the central wavelength of the 1/4 wave plate is the same as the wavelength of the emergent light of the display unit 10.
In an optional embodiment, the optical system further includes a polarizer 40, and the polarizer 40 is disposed between the light incident surface of the first lens 30 and the polarization reflector or on a side of the first lens 30 away from the flat glass 20. Specifically, in order to improve the degree of polarization of the light passing through the polarization reflector, the polarizer 40 is disposed on the light exit side of the polarization reflector, and the polarization direction of the polarizer 40 is the same as the transmission direction of the polarization reflector, so that the stray light passing through the polarization reflector is prevented by the polarizer 40, and the stray light passing through the optical system is reduced.
In an optional embodiment, the optical system further includes a protective glass, where the protective glass is disposed on the light emitting side of the display unit 10, and is used for protecting the display unit 10 from the impact of the external environment or other elements.
In an alternative embodiment, the material of the first lens 30 and the flat glass 20 may be optical glass or optical plastic, specifically, the refractive index of the optical glass material is generally greater than that of the optical plastic material, and the optical glass has better thermal stability and is not easily affected by the heat generated by the display unit 10, so that the working stability of the optical system can be improved. Compared with optical glass, the optical plastic has the advantages of strong plasticity, light weight and low processing cost. In a preferred embodiment, the material of the first lens 30 and the flat glass 20 may be polymethyl methacrylate (PMMA), a Cyclic Olefin Copolymer (COC) or a Cyclic Olefin Polymer (COP), or a novel composite material other than optical glass or optical plastic.
In an alternative embodiment, in an actual optical system design, in order to match different design parameters, the light incident surface and the light emitting surface of the first lens 30 include, but are not limited to, a convex surface, a concave surface, or a continuous curved surface structure.
In an optional embodiment, the polarizing reflector may be further disposed on the light exit surface of the first lens 30, and when the polarizing reflector is disposed on the light exit side of the first lens 30, the optical length of the optical system can be increased, so as to increase the maximum field of view of the optical system.
First embodiment
In the first embodiment, the design data of the optical system is shown in table 1:
TABLE 1
The two side surfaces of the first lens element 30 may be even aspheric surfaces, wherein the even aspheric surfaces satisfy the following relationship:
y is the central height of the mirror surface, Z is the position of the aspheric surface structure with the height of Y along the optical axis direction, the surface vertex is taken as the displacement value of the reference distance from the optical axis, C is the vertex curvature radius of the aspheric surface, and K is the cone coefficient; ai represents the i-th aspheric coefficient.
In another embodiment, the two side surfaces of the first lens element 30 may also be odd aspheric structures, wherein the odd aspheric structures satisfy the following relationship:
y is the central height of the mirror surface, Z is the position of the aspheric surface structure with the height of Y along the optical axis direction, the surface vertex is taken as the displacement value of the reference distance from the optical axis, C is the vertex curvature radius of the aspheric surface, and K is the cone coefficient; β i represents the i-th aspheric coefficient.
Referring to fig. 3, fig. 3 is a schematic diagram of a first embodiment, in which a plurality of light beams emitted from a point are focused on the same point due to aberration, and a diffusion pattern is formed in a certain range for evaluating the image quality of the projection optical system. In the first embodiment, the maximum value of the image points in the dot column image corresponds to the maximum field of view, and the maximum value of the image points in the dot column image is less than 142 μm.
Referring to fig. 4, fig. 4 is a graph of field curvature and optical distortion of the first embodiment, where the field curvature is used to indicate the position change of the beam image point of different field points from the image plane, and the optical distortion is the vertical axis distance of the intersection point of the principal ray at the dominant wavelength of a certain field and the image plane from the ideal image point; in the first embodiment, the field curvature at both the tangential and sagittal planes is less than ± 0.8mm, and the maximum field curvature difference between the tangential and sagittal planes is less than 0.6mm, with maximum distortion at the maximum field of view < 22.6%.
Referring to fig. 5, fig. 5 is a vertical axis chromatic aberration diagram of the first embodiment, in which the vertical axis chromatic aberration is also called magnification chromatic aberration, mainly referring to a polychromatic main light of an object side, which is dispersed by a refraction system and becomes a plurality of light rays when being emitted from an image side, and a difference value between focal positions of hydrogen blue light and hydrogen red light on an image plane; in the first embodiment, the maximum dispersion of the optical system is the maximum position of the field of view of the optical system, and the maximum chromatic aberration value of the optical system is less than 26.4 μm.
In the first embodiment, the length from the display unit 10 to the light emitting surface of the first lens 30 is 32mm, the focal length of the optical system is 28.5mm, and the maximum field angle is 80 degrees, so that on the premise of satisfying the viewing experience of a user, the volume of the optical system is reduced by folding the optical path, thereby reducing the volume and weight of the virtual reality device and improving the use experience of the user.
The utility model discloses still provide a virtual reality equipment, virtual reality equipment includes such as above-mentioned arbitrary embodiment optical system, this optical system's concrete structure refers to above-mentioned embodiment, because this optical system has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. An optical system, comprising in order along a light transmission direction: a display unit, a flat glass and a first lens;
the optical system further comprises a light splitter, and the light splitter is arranged on one side, close to the display unit, of the flat glass or between the flat glass and the first lens;
the optical system further comprises a first phase retarder and a polarization reflector, the first phase retarder is arranged between the first lens and the flat glass, and the polarization reflector is arranged between the first lens and the first phase retarder.
2. The optical system as claimed in claim 1, wherein the light incident surface of the first lens is a concave surface structure, and the light emergent surface of the first lens is a convex surface structure.
3. The optical system of claim 1, wherein the optical system satisfies the relationship:
40mm<ABS(R1)<45mm；ABS(Conic1)<5；
wherein R1 is a radius of curvature of the first lens, ABS (R1) is an absolute value of R1, Conic1 is a Conic coefficient of the first lens, and ABS (Conic1) is an absolute value of Conic 1.
4. The optical system of claim 1, wherein the optical system satisfies the relationship:
50mm<ABS(R2)<60mm；ABS(Conic2)<5；
wherein R2 is a radius of curvature of the first lens, ABS (R2) is an absolute value of R2, Conic2 is a Conic coefficient of the first lens, and ABS (Conic2) is an absolute value of Conic 2.
5. The optical system of claim 1, wherein the optical system satisfies the relationship:
5mm<T1<10mm；
wherein the T1 is a center thickness of the first lens.
6. The optical system of claim 1, wherein the optical system satisfies the relationship:
5mm<L1<8mm；
the L1 is a distance between the light incident surface of the first lens and a surface of the flat glass on a side close to the first lens.
7. The optical system of claim 1, wherein the optical system satisfies the relationship:
15mm<L2<20mm；
the L2 is a distance between a surface of the first lens on a side close to the display unit and a light-emitting surface of the display unit.
8. The optical system of claim 1, further comprising a second phase retarder disposed between the display unit and the beam splitter.
9. The optical system according to claim 1, further comprising a polarizer disposed between the first lens and the polarizing reflector or disposed at the light exit surface of the first lens.
10. A virtual reality device comprising a housing and an optical system as claimed in any one of claims 1 to 9, the optical system being housed in the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021510958.2U CN212846180U (en) | 2020-07-27 | 2020-07-27 | Optical system and virtual reality equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021510958.2U CN212846180U (en) | 2020-07-27 | 2020-07-27 | Optical system and virtual reality equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212846180U true CN212846180U (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021510958.2U Active CN212846180U (en) | 2020-07-27 | 2020-07-27 | Optical system and virtual reality equipment |
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| CN (1) | CN212846180U (en) |
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