CN212391667U - Optical system and augmented reality device - Google Patents
Optical system and augmented reality device Download PDFInfo
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- CN212391667U CN212391667U CN202021233309.2U CN202021233309U CN212391667U CN 212391667 U CN212391667 U CN 212391667U CN 202021233309 U CN202021233309 U CN 202021233309U CN 212391667 U CN212391667 U CN 212391667U
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Abstract
The utility model discloses an optical system and augmented reality equipment. The optical system sequentially comprises a display unit, a spectroscope and a reflector along the light transmission direction, wherein the surface of one side, close to the display unit, of the spectroscope is obliquely arranged with the display unit, and a polarizing reflector is arranged between the spectroscope and the display unit; after the light rays emitted by the display unit are reflected by the polarization reflector, the light rays are transmitted to the reflecting mirror, are reflected by the reflecting mirror again, and then are transmitted to human eyes after passing through the polarization reflector and the light splitting mirror; the optical system further comprises a compensating mirror group, and the compensating mirror group is arranged between the display unit and the polarizing reflector. The utility model provides an optical system and augmented reality equipment aims at solving among the prior art aberration great among the bird bowl optical system, the relatively poor problem of imaging quality.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to an optical system and augmented reality equipment.
Background
Bird's basin (Birdbath) optical design is the optical design scheme that uses often in the augmented reality equipment, and in the Birdbath design scheme, the curved mirror in the augmented reality equipment is passed through to the light of external environment, makes the user can see through the curved mirror and observe the external environment, and consequently most curved mirror adopts the design of district rate spherical mirror, and the optical system's of this kind of design aberration is great to lead to imaging quality relatively poor, influence the observation of user to display image.
SUMMERY OF THE UTILITY MODEL
The utility model provides an optical system and augmented reality equipment aims at solving among the prior art aberration great among the bird bowl optical system, the relatively poor problem of imaging quality.
In order to achieve the above object, the present invention provides an optical system, which comprises a display unit, a beam splitter and a reflector in order along a light transmission direction, wherein the beam splitter is disposed adjacent to a side surface of the display unit and inclined with respect to the display unit, a polarizing reflector is disposed between the beam splitter and the display unit, the polarizing reflector is disposed parallel to a side surface of the beam splitter adjacent to the display unit,
after the light rays emitted by the display unit are reflected by the polarization reflector, the light rays are transmitted to the reflecting mirror, are reflected by the reflecting mirror again, and then are transmitted to human eyes after passing through the polarization reflector and the light splitting mirror;
the optical system further comprises a compensating mirror group, and the compensating mirror group is arranged between the display unit and the polarizing reflector.
Optionally, the compensating mirror group has positive optical power.
Optionally, the light incident surface and the light emergent surface of the compensating mirror group are both provided with an antireflection film.
Optionally, the light incident surface and the light emergent surface of the compensating lens group are both aspheric structures.
Optionally, an included angle of 45 degrees is formed between the surface of one side of the spectroscope close to the display unit and the light emergent surface of the display unit.
Optionally, the reflecting surface of the reflector is a spherical structure.
Optionally, the total length of the optical system is less than 36 mm.
Optionally, the compensating mirror group and the spectroscope are both made of optical plastics.
In order to achieve the above object, the present application provides an augmented 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 provided by the application, the optical system sequentially comprises a display unit, a spectroscope and a reflector along a light transmission direction, wherein the spectroscope is obliquely arranged with the display unit on the surface of one side close to the display unit, a polarization reflector is arranged between the spectroscope and the display unit, and after being reflected by the polarization reflector, light emitted by the display unit is transmitted to the reflector and is reflected by the reflector again, and then transmitted to human eyes after passing through the polarization reflector and the spectroscope; the optical system further comprises a compensating mirror group, and the compensating mirror group is arranged between the display unit and the polarizing reflector. The compensation lens group is arranged between the display unit and the spectroscope, so that aberration of the optical system can be compensated, system aberration of the optical system is reduced, and imaging performance of the optical system is improved, and the problems that aberration in a bird-bowl optical system is large and imaging quality is poor in the prior art are 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 diagram of an optical path of an optical system not compensated by a compensating lens group according to the present invention;
FIG. 2 is a diagram of the modulation transfer function of an optical system not compensated by a compensating lens group according to the present invention;
fig. 3 is a schematic diagram of an optical system not compensated by a compensating lens group according to the present invention;
fig. 4 is a schematic light path diagram of the optical system compensated by the compensating lens group according to the present invention;
fig. 5 is a diagram of the modulation transfer function of the optical system compensated by the compensating lens group according to the present invention;
fig. 6 is a point diagram of the optical system compensated by the compensating lens group according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
40 | |
| 20 | |
50 | Compensating |
| 30 | Reflecting |
60 | Aperture diaphragm |
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 augmented reality equipment.
Referring to fig. 1 and 4, the optical system sequentially includes a display unit 10, a beam splitter 20 and a reflector 30 along a light transmission direction, a side surface of the beam splitter 20 close to the display unit 10 is obliquely disposed with the display unit 10, a polarizing reflector 40 is disposed between the beam splitter 20 and the display unit 10, and an arrangement direction of the polarizing reflector 40 is parallel to a side surface of the beam splitter 20 close to the display unit 10;
after the light emitted by the display unit 10 is reflected by the polarizing reflector 40, the light is transmitted to the reflecting mirror 30, and after being reflected by the reflecting mirror 30 again, the light is transmitted through the polarizing reflector 40 and the beam splitter 20 and then transmitted to the human eye;
the optical system further comprises a compensating mirror group 50, the compensating mirror group 50 being arranged between the display unit 10 and the polarizing reflector 40.
In a preferred embodiment, the polarizing reflector 40 is a polarizing reflective film, and the polarizing reflective film is disposed on the surface of the beam splitter 20 by means of adhesion or plating, it is understood that, when the polarizing reflector 40 is a polarizing reflective film and the beam splitter 20 is a flat plate structure, the polarizing reflective film may be adhered or plated on any one working surface of the beam splitter 20, where the working surface of the beam splitter 20 is a light incident surface or a light emergent surface of the beam splitter 20, the light incident surface of the beam splitter 20 is a side surface of the beam splitter 20 close to the display unit 10, and the light emergent surface of the beam splitter 20 is a side surface of the beam splitter 20 away from the display unit 10.
In the technical scheme provided by the application, the optical system sequentially comprises a display unit 10, a spectroscope 20 and a reflector 30 along a light transmission direction, the spectroscope 20 is obliquely arranged with the display unit 10 and close to one side surface of the display unit 10, a polarizing reflector 40 is arranged between the spectroscope 20 and the display unit 10, and after being reflected by the polarizing reflector 40, light emitted by the display unit 10 is transmitted to the reflector 30, is reflected by the reflector 30 again, and then passes through the polarizing reflector 40 and the spectroscope 20 and then is transmitted to human eyes; the optical system further comprises a compensating mirror group 50, the compensating mirror group 50 being arranged between the display unit 10 and the polarizing reflector 40. By arranging the compensating mirror group 50 between the display unit 10 and the spectroscope 20, the aberration of the optical system can be compensated, the system aberration of the optical system is reduced, and the imaging performance of the optical system is improved, so that the problems of large aberration and poor imaging quality in the bird-bowl optical system in the prior art are solved.
In an alternative embodiment, the compensating mirror group 50 has positive optical power. The focal power refers to the ability of the optical system to deflect light, specifically, the focal power is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, and when the focal power is larger, the focal power of the optical element on the light is stronger, and when the focal power is smaller, the divergence of the optical element on the light is stronger. In one embodiment, when the compensating lens group 50 has positive optical power, the compensating lens group 50 can focus the light emitted from the display unit 10 and perform aberration correction on the light emitted from the display unit 10.
In an optional embodiment, the light incident surface and the light exiting surface of the compensating lens group 50 are both provided with an antireflection film. Specifically, in order to improve the light transmission efficiency of the optical system, antireflection films are disposed on the working surfaces on both sides of the compensating mirror group 50, and the working surfaces of the compensating mirror group 50 are the light incident surface and the light emergent surface of the compensating mirror group 50. In one specific embodiment, the refractive index of the compensating lens assembly 50 is 1.5, the transmittance of the compensating lens assembly 50 is 95% when the working surface of the compensating lens assembly 50 is uncoated, the transmittance of the compensating lens assembly 50 is more than 99% when the working surface of the compensating lens assembly 50 is coated with an antireflection film, and the total of the working surfaces on both sides of the compensating lens assembly 50 can provide 8% transmittance, so as to improve the light transmission efficiency of the compensating lens assembly 50.
In an optional embodiment, the light incident surface and the light exiting surface of the compensating lens group 50 are both aspheric structures. Compared with a spherical structure, the aspheric structure can effectively reduce the edge aberration of the lens and improve the performance of the optical system, thereby reducing the required number of the lenses and shortening the total length of the optical system. Through the aspheric surface structure, the effect of correcting aberration of the spherical lenses is effectively realized, and the optical system is favorably miniaturized.
In an alternative embodiment, a side surface of the beam splitter 20 close to the display unit 10 forms an included angle of 45 degrees with the light emergent surface of the display unit 10. Specifically, the light emitted by the display unit 10 passes through the compensating mirror group 50 and then is transmitted to the spectroscope 20, in order to ensure that the light emitted by the display unit 10 is transmitted to the reflector 30 after being reflected by the spectroscope 20, the light reflected by the reflector 30 can be transmitted to the human eye through the spectroscope 20, when an included angle between the spectroscope 20 and the light exit surface of the display unit 10 is greater than 45 degrees or less than 45 degrees, the light reflected by the spectroscope 20 may deviate from an original light path after being reflected by the reflector 30, and thus does not pass through the working surface of the spectroscope 20 any more and then becomes stray light.
In an alternative embodiment, the reflecting surface of the reflector 30 is a spherical structure.
In an alternative embodiment, the total length of the optical system is less than 36 mm. Specifically, the total length of the optical system refers to the distance from the first lens surface of the optical system to the image plane, and in a specific embodiment, the total length of the optical system is reduced in a mode of turning back the optical path, so that the volume of the optical system is reduced.
In an alternative embodiment, the compensating lens group 50 and the beam splitter 20 are both made of optical plastic material. Compared with optical glass, the optical plastic has the advantages of strong plasticity, light weight and low processing cost. Preferably, the material of the compensating lens group 50 is K26R.
First embodiment
In the first embodiment, when the compensating mirror group 50 is not included in the optical system, the optical path design data of the optical system is shown in table 1:
TABLE 1
Referring to fig. 2, fig. 2 is a Modulation Transfer Function (MTF) diagram of the optical system before compensation in the first embodiment, wherein the MTF is a relationship between a Modulation degree and a logarithm per millimeter in an image for evaluating a detail reduction capability of a scene. The MTF curve of an uncompensated system is smooth as a whole, but the MTF of the central view field is poor and is distributed between 0.1 and 0.4, and the MTF values of the other view fields are basically over 0.6.
Referring to fig. 3, fig. 3 is a point diagram of the optical system before compensation in the first embodiment, where the point diagram refers to that after many light rays emitted from a point pass through the optical system, intersection points of the light rays and an image plane are no longer concentrated on the same point due to aberration, and a diffusion pattern scattered in a certain range is formed for evaluating the imaging quality of the projection optical system. In the first embodiment, the maximum value of the image point in the point array image corresponds to the maximum field of view, and the spot radius of the central field of view before compensation is 24.09 μm.
When the compensating mirror group 50 is included in the optical system, the optical path design data of the optical system is shown in table 2:
TABLE 2
The working surface of the compensating lens group 50 may be an even aspheric structure, wherein the even aspheric structure satisfies 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 working surface of the compensating lens group 50 can also be an odd-order aspheric surface, wherein the odd-order aspheric surface satisfies 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. 4, fig. 4 is a diagram of a Modulation Transfer Function (MTF) of the optical system after compensation in the first embodiment, wherein the MTF is a relationship between a Modulation degree and a logarithm of lines per millimeter in an image for evaluating a detail reduction capability of a scene.
Referring to fig. 5, fig. 5 is a point diagram of the optical system after compensation in the first embodiment, where the point diagram refers to that after many light rays emitted from a point pass through the optical system, intersection points of the light rays and an image plane are no longer concentrated on the same point due to aberration, and a diffusion pattern scattered in a certain range is formed for evaluating the imaging quality of the projection optical system. In the first embodiment, the maximum value of the image point in the point array image corresponds to the maximum field of view, and the spot radius of the compensated central field of view is 1.075 μm.
In the first embodiment, the focal length of the optical system before compensation is 30mm, the total length of the optical system is 33.42mm, and the spot size of the optical system in the central field is 24.09 μm, the focal length of the optical system after compensation is 31mm after adding the compensating optical group 50, the total length of the optical system is 35.35mm, and the spot size of the optical system in the central field is 1.07 μm, the total length of the optical system is increased less but the spot size in the central field is decreased more than before adding the compensating optical group 50, the spot size of the optical system after compensation is substantially close to the system airy spot, and the imaging quality of each field is improved to a different extent from the modulation transfer functions before and after compensation.
The utility model discloses still provide an augmented reality equipment, augmented reality equipment includes such as above-mentioned arbitrary embodiment optical system, this optical system's specific 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 not repeated here one by one again.
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 (9)
1. An optical system is characterized by comprising a display unit, a spectroscope and a reflector in sequence along a light transmission direction, wherein the surface of one side, close to the display unit, of the spectroscope is obliquely arranged with the display unit;
after the light rays emitted by the display unit are reflected by the polarization reflector, the light rays are transmitted to the reflecting mirror, are reflected by the reflecting mirror again, and then are transmitted to human eyes after passing through the polarization reflector and the light splitting mirror;
the optical system further comprises a compensating mirror group, and the compensating mirror group is arranged between the display unit and the polarizing reflector.
2. The optical system of claim 1 wherein said compensating lens group has positive optical power.
3. The optical system as claimed in claim 1, wherein an antireflection film is disposed on both the light incident surface and the light emergent surface of the compensating lens group.
4. The optical system as claimed in claim 1, wherein the light incident surface and the light emitting surface of the compensating lens group are aspheric structures.
5. The optical system as claimed in claim 1, wherein a side surface of the beam splitter adjacent to the display unit forms an angle of 45 degrees with the light exit surface of the display unit.
6. The optical system of claim 1 wherein the reflective surface of the mirror is a spherical structure.
7. The optical system of claim 1 wherein the overall length of the optical system is less than 36 mm.
8. The optical system of claim 1 wherein said compensating mirror group and said beam splitter are made of optical plastic material.
9. An augmented reality device comprising a housing and an optical system as claimed in any one of claims 1 to 8, the optical system being housed within the housing.
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|---|---|---|---|
| CN202021233309.2U CN212391667U (en) | 2020-06-29 | 2020-06-29 | Optical system and augmented reality device |
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| CN202021233309.2U CN212391667U (en) | 2020-06-29 | 2020-06-29 | Optical system and augmented reality device |
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| CN212391667U true CN212391667U (en) | 2021-01-22 |
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