CN209842246U - Optical module and augmented reality device - Google Patents
Optical module and augmented reality device Download PDFInfo
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- CN209842246U CN209842246U CN201921022453.9U CN201921022453U CN209842246U CN 209842246 U CN209842246 U CN 209842246U CN 201921022453 U CN201921022453 U CN 201921022453U CN 209842246 U CN209842246 U CN 209842246U
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Abstract
The utility model provides an optical module and augmented reality device relates to augmented reality technical field, including base plate, polaroid and phase delay subassembly, the polaroid sets up the base plate is in the one side of image source dorsad, and the polaroid absorbs first attitude polarized light and transmits second attitude polarized light, in first attitude polarized light and second attitude polarized light, one is p attitude polarized light, and the other is s attitude polarized light; the phase delay assembly is arranged between the polaroid and the substrate and used for converting the second-state polarized light passing through the phase delay assembly into the first-state polarized light. Incident stray light firstly passes through the polaroid, the polaroid absorbs first-state polarized light and transmits second-state polarized light, the second-state polarized light is converted into circularly polarized light after passing through the phase delay assembly, the circularly polarized light is reflected by the substrate and then passes through the phase delay assembly again so as to be converted into first-state polarized light, and the first-state polarized light is absorbed by the polaroid to eliminate the stray light.
Description
Technical Field
The utility model belongs to the technical field of the augmented reality technique and specifically relates to an optical mold group and augmented reality device are related to.
Background
Augmented Reality (AR) is a technology for calculating the position and angle of a camera image in real time and adding a corresponding image, and can overlay virtual image information generated by a computer and real visual information of a user and enable the virtual image information to be perceived by the user, thereby achieving sensory experience beyond Reality. The augmented reality technology comprises new technologies and new means such as multimedia, three-dimensional modeling, real-time video display and control, multi-sensor fusion, real-time tracking and registration, scene fusion and the like.
As shown in fig. 1 and fig. 2, the optical component in the current augmented reality device includes an image source 101 ', a substrate 106 ', and a concave mirror 105 ', an included angle between a plane of the substrate 106 ' and a main optical axis of the cemented lens 105 ' is an acute angle, the concave mirror 105 ' is disposed on one side of the substrate 106 ' to reflect light, the light emitted from the image source 101 ' is reflected by the substrate 106 ' to enter the concave mirror 105 ', reflected by the concave mirror 105 ' to enter the substrate 106 ', transmitted by the substrate 106 ' to enter a human eye 109 ', so that the human eye 109 ' can see a picture displayed by the image source 101 ', and simultaneously ambient light can directly pass through the concave mirror 105 ' and the substrate 106 ' with zero power to enter the human eye 109 ', so as to combine a real world with a virtual image, thereby bringing a brand new visual experience to a user.
However, there is a case where the stray light 104 is reflected into the human eye 109' at the bottom of the optical path of the current augmented reality device, which affects the user experience.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical mold group and augmented reality device to there is the condition that miscellaneous light reflection got into the people's eye, influences user experience's technical problem in the light path bottom of solving current part augmented reality device.
In a first aspect, the present invention provides an optical module, the optical module includes a substrate, a polarizer and a phase delay assembly, the polarizer is disposed on a side of the substrate facing away from an image source, the polarizer can absorb a first state polarized light and transmit a second state polarized light, and the first state polarized light and the second state polarized light are a p-state polarized light and an s-state polarized light respectively;
the phase delay assembly is arranged between the polaroid and the substrate, the second-state polarized light can penetrate through the phase delay assembly to be irradiated on the substrate and is reflected by the substrate to form reflected light, and the phase delay assembly can convert the reflected light penetrating through the phase delay assembly into first-state polarized light.
Furthermore, the phase delay assembly is a quarter-wave plate, and an included angle between the transmission axis direction of the polaroid and the fast axis direction of the quarter-wave plate is 45 degrees.
Further, the polarizer, the quarter-wave plate and the substrate are glued together.
Furthermore, a semi-transparent and semi-reflective film is plated on the substrate.
Further, the optical module includes a plano-convex lens disposed between the image source and the substrate.
Further, the optical module comprises a positive lens and a negative lens which are matched with each other, and the positive lens and the negative lens are both arranged between the plano-convex lens and the substrate;
furthermore, an included angle between the plane of the substrate and the direction of a main optical axis of the concave reflector towards human eyes is A;
the image source deflects towards the substrate in the reverse direction, an included angle between light emitted by the image source and the direction of a main optical axis of the concave reflecting mirror back to the human eyes is B, and the value of B satisfies the following conditions: b ═ (a-45 °) × 2+90 °.
Further, the range of an included angle A between the plane where the substrate is located and the direction of the main optical axis of the concave reflector towards the human eyes meets the following requirements: a is more than or equal to 45 degrees and less than or equal to 55 degrees.
Furthermore, the substrate is made of glass or resin.
In a second aspect, an augmented reality apparatus includes the optical module.
The utility model provides an optical module, optical module includes base plate, polaroid and phase delay subassembly, the polaroid sets up in the base plate one side of being the image source dorsad, the polaroid can absorb first attitude polarized light and transmit second attitude polarized light, first attitude polarized light and second attitude polarized light are p attitude polarized light sum s attitude polarized light respectively; the phase delay assembly is arranged between the polaroid and the substrate, the second-state polarized light can penetrate through the phase delay assembly to be irradiated on the substrate and is reflected by the substrate to form reflected light, and the phase delay assembly can convert the reflected light penetrating through the phase delay assembly into first-state polarized light. Incident stray light firstly passes through the polaroid, the polaroid absorbs first-state polarized light and transmits second-state polarized light, the second-state polarized light is converted into circularly polarized light after passing through the phase delay assembly, the circularly polarized light is reflected by the substrate and then passes through the phase delay assembly again, so that the circularly polarized light is converted into first-state polarized light, and the first-state polarized light is absorbed by the polaroid, so that the purpose of eliminating the stray light is achieved.
The embodiment of the utility model provides an augmented reality device, including foretell optical module, so, the utility model provides an augmented reality device also possesses optical module's advantage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an overall optical path diagram of a conventional augmented reality device;
FIG. 2 is a schematic diagram of stray light reflection of a conventional augmented reality device;
fig. 3 is a schematic view of an optical module according to embodiment 1 of the present invention for eliminating stray light;
fig. 4 is an overall optical path diagram of an optical module provided in embodiment 1 of the present invention;
fig. 5 is a schematic view of an optical module according to embodiment 2 of the present invention for eliminating stray light;
fig. 6 is an overall optical path diagram of an optical module according to embodiment 2 of the present invention;
fig. 7 is a schematic view of an optical module according to embodiment 3 of the present invention for eliminating stray light;
fig. 8 is an overall optical path diagram of an optical module according to embodiment 3 of the present invention;
fig. 9 is a schematic view of an optical module according to embodiment 4 of the present invention for eliminating stray light;
fig. 10 is an overall optical path diagram of an optical module provided in embodiment 4 of the present invention;
fig. 11 is a schematic structural diagram of an optical module according to embodiment 4 of the present invention.
Icon: 101' -image source; 105' -a concave mirror; 106' -a substrate; 109' -the human eye; 101-image source; 102-plano-convex lens; 103-a cemented lens; 103 a-negative lens; 103 b-positive lens; 104-veiling glare; 105-a concave mirror; 106-a substrate; 107-quarter wave plate; 108-a polarizer; 109-human eye.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 3 and 4, the optical module according to the present invention includes a substrate 106, a polarizer 108 and a phase retardation assembly, wherein the polarizer 108 is disposed on a side of the substrate 106 facing away from the image source 101, the polarizer 108 can absorb a first state polarized light and transmit a second state polarized light, one of the first state polarized light and the second state polarized light is a p-state polarized light, and the other is an s-state polarized light; the phase retardation assembly is disposed between the polarizer 108 and the substrate 106, the second-state polarized light can pass through the phase retardation assembly to be irradiated on the substrate 106 and reflected by the substrate 106 to form reflected light, and the phase retardation assembly can convert the reflected light passing through itself into first-state polarized light.
The incident stray light 104 firstly passes through the polarizing plate 108, the polarizing plate 108 absorbs the polarized light in the first state and transmits the polarized light in the second state, the polarized light in the second state is converted into circularly polarized light after passing through the phase delay assembly, the circularly polarized light is reflected by the substrate 106 and then reflected by the concave reflector 105, and then passes through the phase delay assembly again, so that the circularly polarized light is converted into the polarized light in the first state, and the polarized light in the first state is absorbed by the polarizing plate 108, thereby achieving the purpose of eliminating the stray light 104.
The polarizer 108 may absorb p-polarized light and transmit s-polarized light; the polarizer 108 may also absorb s-polarized light and transmit p-polarized light.
In this embodiment, the phase retardation assembly is a quarter-wave plate 107, and an included angle between the transmission axis direction of the polarizer 108 and the fast axis direction of the quarter-wave plate 107 is 45 °.
In this embodiment, an included angle between the plane of the substrate 106 and the main optical axis of the concave reflector 105 is 45 °.
In this embodiment, the image source 101 emits light, which may be in a linear polarization state or an unpolarized state, and enters the concave reflector 105 after being reflected by the substrate 106, passes through the substrate 106 after being reflected by the concave reflector 105, enters the quarter-wave plate 107 after being transmitted by the substrate 106, then enters the polarizer 108, and finally enters the human eye 109, so that the human eye 109 can see the picture displayed by the image source 101; ambient light can pass directly through the concave mirror 105 of zero power, the substrate 106, the quarter-wave plate 107, the polarizer 108, and into the human eye 109 without distortion. Similarly, after the stray light 104 from the bottom passes through the polarizer 108, s-state polarized light is absorbed, p-state polarized light is transmitted, the stray light 104 is changed into p-state polarized light, the p-state polarized light is changed into circularly polarized light through the quarter-wave plate 107, the circularly polarized light reaches the substrate 106 and is reflected back, and then the circularly polarized light passes through the quarter-wave plate 107 again, because the p-state polarized light is changed into s-state polarized light through the quarter-wave plate 107 twice, and the s-state polarized light is absorbed after reaching the polarizer 108, so that the stray light 104 is eliminated, and user experience is improved.
Specifically, the image source 101 may be an organic light emitting diode or a liquid crystal on silicon or a liquid crystal display, or may be other optical display devices capable of implementing display.
Preferably, the polarizer 108, the quarter-wave plate 107 and the substrate 106 are glued together, and the gluing of the three has the advantage that the polarizer 108, the quarter-wave plate 107 and the substrate 106 can be installed and removed as a whole in use, so that the assembly is more convenient and quicker.
The substrate 106 is made of a material with good light transmittance, such as glass or resin, the substrate 106 is plated with a transflective film, and the transmittance t of the transflective film satisfies the following range: 10% < t < 90%, the range of reflectance r satisfying: 90% > r > 10%, therefore the light will produce the effect of partial transmission, partial reflection after passing.
Preferably, the range of the absolute value of curvature | R | of the concave mirror 105 satisfies: 15mm < | R | < 100 mm. The thickness and the weight of the augmented reality device can be reduced, and the oppressive feeling when the device is worn is lightened. The light incident on the concave reflector 105 can be completely reflected, and the probability that the light cannot be completely incident in the effective reflection range is reduced.
The concave reflector 105 can be made of glass or resin, the film system is a semi-transparent and semi-reflective film, and the range of the transmittance t satisfies: 10% < t < 90%, the range of reflectance r satisfying: 90% > r > 10%.
In this embodiment, the transmittance and reflectance of the transflective film are set to 50% respectively, and half of the light passing through the substrate 106 is transmitted and reflected. The concave reflector 105 is disposed right in front of the human eye 109, and the light of the external environment needs to be transmitted through the concave reflector 105 and the substrate 106 to enter the human eye 109, so the concave reflector 105 is also plated with a transflective film.
Example 2
As shown in fig. 5 and 6, the difference from embodiment 1 is that the optical module includes a plano-convex lens 102, and the plano-convex lens 102 is disposed between an image source 101 and the substrate 106.
In this embodiment, the light emitted by the image source 101, which may be in a linear polarization state or a non-polarization state, passes through the plano-convex lens 102, is reflected by the substrate 106, enters the concave reflector 105, is reflected by the concave reflector 105, passes through the substrate 106, is transmitted by the substrate 106, enters the quarter-wave plate 107, enters the polarizer 108, and finally enters the human eye 109, so that the human eye 109 can see the picture displayed by the image source 101; ambient light can pass directly through the concave mirror 105 of zero power, the substrate 106, the quarter-wave plate 107, the polarizer 108, and into the human eye 109 without distortion. Similarly, after the stray light 104 from the bottom passes through the polarizer 108, s-state polarized light is absorbed, p-state polarized light is transmitted, the stray light 104 is changed into p-state polarized light, and the p-state polarized light passes through the quarter-wave plate 107, reaches the substrate 106, is reflected back, and then passes through the quarter-wave plate 107 again, because the p-state polarized light is converted into s-state polarized light after passing through the quarter-wave plate 107 twice, and after reaching the polarizer 108, the s-state polarized light is absorbed, so that the stray light 104 is eliminated, and the user experience is improved.
Preferably, the focal length f1 of the plano-convex lens 102 ranges from: 10mm < f1<50 mm.
The plane of the plano-convex lens 102 can be attached to the image source 101, so that the structure is more compact, the installation process is more convenient, and the stability of the structure is improved.
Alternatively, the surface type of the plano-convex lens 102 includes any one of a spherical surface, an aspherical surface, and a free-form surface.
It should be noted that, the material of the plano-convex lens 102 may be glass or resin.
Example 3
As shown in fig. 7 and 8, the optical module is different from embodiment 1 in that the optical module further includes a cemented lens 103, and the cemented lens 103 is disposed between the plano-convex lens 102 and the substrate 106; the cemented lens 103 includes a positive lens 103b and a negative lens 103a that cooperate with each other.
In this embodiment, the light emitted by the image source 101, which may be in a linear polarization state or a non-polarization state, passes through the plano-convex lens 102, the cemented lens 103, the substrate 106 and the concave mirror 105, passes through the substrate 106 after being reflected by the concave mirror 105, and enters the quarter-wave plate 107 after being transmitted by the substrate 106, then enters the polarizer 108, and finally enters the human eye 109, so that the human eye 109 can see the image displayed by the image source 101; ambient light can pass directly through the concave mirror 105 of zero power, the substrate 106, the quarter-wave plate 107, the polarizer 108, and into the human eye 109 without distortion. Similarly, after the stray light 104 from the bottom passes through the polarizer 108, s-state polarized light is absorbed, p-state polarized light is transmitted, the stray light 104 becomes p-state polarized light, and then passes through the quarter-wave plate 107, reaches the substrate 106, is reflected back, and then passes through the quarter-wave plate 107 again, because the p-state polarized light is converted into s-state polarized light after passing through the quarter-wave plate 107 twice, and then the s-state polarized light is absorbed after reaching the polarizer 108, so that the stray light 104 is eliminated, and the user experience is improved.
As shown in fig. 8, in the present embodiment, the negative lens 103a of the cemented lens 103 is located on a side close to the image source 101, and in this case, a side of the negative lens 103a close to the image source 101 is a plane.
In addition, the positive lens 103b of the cemented lens 103 is located on a side close to the image source 101, and in this case, a side of the positive lens 103b close to the image source 101 is a plane.
Preferably, the focal length f1 of the plano-convex lens 102 ranges from: 10mm < f1<50 mm. The focal length f2 of the cemented lens 103 ranges from: 30mm < f2<200 mm.
In this embodiment, the cemented lens 103 is formed by bonding a positive lens and a negative lens, so that the negative chromatic aberration generated by the single positive lens 103b and the positive chromatic aberration generated by the single negative lens 103a can be compensated, and the chromatic aberration is reduced or eliminated by the chromatic aberration compensation of the cemented lens 103, so as to achieve the best display effect.
It should be noted that, in order to reduce the problems of astigmatism and the like caused by light divergence, a person skilled in the art can select different focal lengths within the above range according to needs, and assemble the focal lengths in a matching manner, so as to improve the convergence force on light and compensate for the distortion generated in the light propagation process, thereby improving the resolution of the augmented reality device and improving the user experience. So as to achieve better image display effect.
Alternatively, the surface types of the convex lens, the positive lens 103b, and the negative lens 103a include any one of a spherical surface, an aspherical surface, and a free-form surface.
The included angle between the plane of the substrate 106 and the principal optical axis of the cemented lens 103 is an acute angle.
Example 4
As shown in fig. 9, 10 and 11, the difference from the embodiment 2 is that an included angle between the plane of the substrate 106 and the direction of the main optical axis of the concave reflector 105 toward the human eye 109 is a; wherein A is more than or equal to 45 degrees and less than or equal to 55 degrees. The image source 101 deflects towards the substrate 106 in the opposite direction, an included angle between light emitted by the image source 101 and a direction of a main optical axis of the concave reflecting mirror 105 back to the human eye 109 is B, and a value of B satisfies: b ═ (a-45 °) × 2+90 °.
The angle B serves to compensate for off-axis aberrations caused by an angular deviation of 45 ° from the plane of the substrate 106 and the direction of the primary optical axis of the concave mirror 105 towards the human eye 109.
In this embodiment, an included angle between the plane where the substrate 106 is located and the direction of the main optical axis of the concave reflective mirror 105 facing the human eye 109 is 48 °, and an included angle between the light emitted from the image source 101 and the direction of the main optical axis of the concave reflective mirror 105 facing away from the human eye 109 is 96 °.
When a is 45 °, B is 90 °, then the light from the image source 101 is perpendicular to the primary optical axis of the concave mirror 105.
An augmented reality device, includes foretell optical module, during the use, can eliminate veiling glare 104, improves user experience.
To sum up, the utility model provides an optical module, optical module includes base plate 106, polaroid 108 and phase delay subassembly, polaroid 108 sets up the base plate 106 one side of being back to image source 101, polaroid 108 can absorb first attitude polarized light and transmit second attitude polarized light, in first attitude polarized light and the second attitude polarized light, one is p attitude polarized light, and the other is s attitude polarized light; the phase retardation assembly is disposed between the polarizer 108 and the substrate 106, the second-state polarized light can pass through the phase retardation assembly to be irradiated on the substrate 106 and reflected by the substrate 106 to form reflected light, and the phase retardation assembly can convert the reflected light passing through itself into first-state polarized light. The incident stray light 104 firstly passes through the polarizing plate 108, the polarizing plate 108 absorbs first-state polarized light and transmits second-state polarized light, the second-state polarized light is converted into circularly polarized light after passing through the phase delay assembly, the circularly polarized light is reflected by the substrate 106 and then passes through the phase delay assembly again, so that the circularly polarized light is converted into first-state polarized light, and the first-state polarized light is absorbed by the polarizing plate 108, so that the purpose of eliminating the stray light 104 is achieved.
The utility model provides an optical module and augmented reality device has following advantage:
1. the utility model provides an optical module uses polaroid 108 and quarter wave plate 107 can eliminate the parasitic light 104 of bottom incidence, has improved user experience.
2. The included angle between the plane of the substrate 106 and the direction of the main optical axis of the concave reflector 105 towards the human eye 109 is A, wherein A is more than or equal to 45 degrees and less than or equal to 55 degrees. The relation of an included angle B between the light emitted by the image source 101 and the direction of the main optical axis of the concave reflecting mirror 105 back to the human eye 109 satisfies the following relation: b ═ 2+90 ° x (a-45 °), so that the optical module can meet the needs of different augmented reality devices.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An optical module is characterized by comprising a substrate, a polaroid and a phase delay assembly, wherein the polaroid is arranged on one side of the substrate, which faces away from an image source, and can absorb polarized light in a first state and transmit polarized light in a second state, and the polarized light in the first state and the polarized light in the second state are respectively polarized light in a p state and polarized light in an s state;
the phase delay assembly is arranged between the polaroid and the substrate, the second-state polarized light can penetrate through the phase delay assembly to be irradiated on the substrate and is reflected by the substrate to form reflected light, and the phase delay assembly can convert the reflected light penetrating through the phase delay assembly into first-state polarized light.
2. The optical module of claim 1 wherein the phase retardation element is a quarter-wave plate, and the polarizer has a transmission axis oriented at an angle of 45 ° to the fast axis of the quarter-wave plate.
3. The optical module of claim 2 wherein the polarizer, quarter-wave plate and substrate are glued together.
4. The optical module of claim 1 wherein the substrate is coated with a transflective film.
5. The optical module of claim 3, wherein the optical module comprises a plano-convex lens disposed between the image source and the substrate.
6. The optical module of claim 5, wherein the optical module includes a positive lens and a negative lens that mate with each other, the positive lens and the negative lens each being disposed between the plano-convex lens and the substrate.
7. The optical module of claim 1, wherein the plane of the substrate and the angle between the main optical axis of the concave mirror and the direction of the human eye are A;
the image source deflects towards the substrate in the reverse direction, an included angle between light emitted by the image source and the direction of a main optical axis of the concave reflecting mirror back to the human eyes is B, and the value of B satisfies the following conditions: b ═ (a-45 °) × 2+90 °.
8. The optical module of claim 7, wherein the range of the included angle a between the plane of the substrate and the direction of the main optical axis of the concave mirror toward the human eye satisfies: a is more than or equal to 45 degrees and less than or equal to 55 degrees.
9. The optical module of claim 1, wherein the substrate is made of glass or resin.
10. An augmented reality device comprising the optical module of any one of claims 1-9.
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| CN201921022453.9U CN209842246U (en) | 2019-07-02 | 2019-07-02 | Optical module and augmented reality device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111552080A (en) * | 2020-05-28 | 2020-08-18 | Oppo广东移动通信有限公司 | Optical path and AR glasses |
| WO2021197294A1 (en) * | 2020-03-31 | 2021-10-07 | 优奈柯恩(北京)科技有限公司 | Display device |
-
2019
- 2019-07-02 CN CN201921022453.9U patent/CN209842246U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021197294A1 (en) * | 2020-03-31 | 2021-10-07 | 优奈柯恩(北京)科技有限公司 | Display device |
| CN111552080A (en) * | 2020-05-28 | 2020-08-18 | Oppo广东移动通信有限公司 | Optical path and AR glasses |
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