CN212694162U - Optical system for augmented reality and head-mounted augmented reality device - Google Patents
Optical system for augmented reality and head-mounted augmented reality device Download PDFInfo
- Publication number
- CN212694162U CN212694162U CN202021586259.6U CN202021586259U CN212694162U CN 212694162 U CN212694162 U CN 212694162U CN 202021586259 U CN202021586259 U CN 202021586259U CN 212694162 U CN212694162 U CN 212694162U
- Authority
- CN
- China
- Prior art keywords
- optical unit
- image
- polarization state
- image light
- quarter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides an optical system for augmented reality and a head-mounted augmented reality device, wherein the optical system for augmented reality comprises an image unit, a first optical unit and a second optical unit; the image unit is used for emitting image light to the first optical unit; the first optical unit is used for reflecting the image light part into a first image light beam in a first polarization state, transmitting and converting the first image light beam into a circular polarization state or an elliptical polarization state, and then transmitting the first image light beam to the second optical unit; the second optical unit is used for reflecting the first image light beam to the first optical unit; the first optical unit is also used for transmitting and transforming the first image light beam reflected by the second optical unit into a second polarization state, and transmitting the second image light beam into human eyes. Compared with the prior art, the utility model discloses an optical system simple structure, and can be used for wear-type augmented reality equipment.
Description
Technical Field
The utility model relates to a wear-type display device field especially relates to an optical system and wear-type augmented reality equipment for augmented reality.
Background
Augmented Reality (AR) superimposes a virtual image generated by a computer on a real scene and projects the image to human eyes, so that a user can experience fusion of virtual and Reality, and the AR Augmented Reality system is widely applied to the fields of games, retail sales, education, industry, medical treatment and the like.
The optical system for enhancing reality in the market is too complex and occupies a large space.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical system for augmented reality to solve the shortcoming among the prior art and not enough.
The utility model discloses an optical system for augmented reality, include: an image unit, a first optical unit and a second optical unit;
the image unit is used for emitting image light to the first optical unit; the first optical unit is used for reflecting the image light part into a first image light beam in a first polarization state, transmitting and converting the first image light beam into a circular polarization state or an elliptical polarization state, and then transmitting the first image light beam to the second optical unit; the second optical unit is used for reflecting the first image light beam to the first optical unit; the first optical unit is also used for transmitting and transforming the first image light beam reflected by the second optical unit into a second polarization state, and transmitting the second image light beam into human eyes; the second optical unit is also used for transmitting ambient light, and the ambient light transmitted by the second optical unit is transmitted to the first optical unit and enters human eyes after being transmitted.
Compared with the prior art, the utility model discloses an optical system simple structure, and can be used for wear-type augmented reality equipment.
In a preferred or optional embodiment, the first optical unit comprises a first quarter-wave plate and a first polarization beam splitting element which are sequentially arranged along the emission direction of the image light; the first polarization light splitting element is used for reflecting light in a first polarization state and transmitting light in a second polarization state;
the first image light beam reflected by the second optical unit enters human eyes after being transmitted by the first quarter-wave plate and the first polarization beam splitting element of the first optical unit in sequence.
In a preferred or optional embodiment, further comprising a third optical unit; the first optical unit is further used for partially transmitting the image light into a second image light beam in a second polarization state, transmitting and converting the second image light beam into a circular polarization state or an elliptical polarization state, and then transmitting the second image light beam to the third optical unit; the third optical unit is used for reflecting the second image light beam to the first optical unit, and the first optical unit is also used for transmitting and converting the second image light beam reflected by the third optical unit into a first polarization state, transmitting and converting the second image light beam reflected by the third optical unit into a circular polarization state or an elliptical polarization state again after reflection, and enabling the second image light beam to enter human eyes;
the first optical unit is also used for transmitting and converting the first image light beam reflected by the second optical unit into a second polarization state, transmitting and converting the first image light beam into a circular polarization state or an elliptical polarization state and then entering human eyes; the third optical unit is also used for reflecting interference light rays, and the interference light rays reflected by the third optical unit enter the external environment.
In a preferred or optional embodiment, the optical unit includes a first quarter-wave plate, a first polarization beam splitting element, a second polarization beam splitting element, and a second quarter-wave plate, which are sequentially arranged along an image light emitting direction, and both the first polarization beam splitting element and the second polarization beam splitting element are configured to reflect light in a first polarization state and transmit light in a second polarization state; the third optical unit comprises a first transflective element;
the first image light beam reflected by the second optical unit sequentially passes through the first quarter-wave plate, the first polarization beam splitting element, the second polarization beam splitting element and the second quarter-wave plate and then enters human eyes after being transmitted;
the second image beam reflected by the third optical unit is transmitted through the second quarter-wave plate of the first optical unit in sequence, reflected by the second polarization beam splitting element, transmitted through the second quarter-wave plate again and enters human eyes.
In a preferred or optional embodiment, the second optical unit comprises a second transflective element, a third quarter-wave plate and a polarizer, which are sequentially arranged along the incident direction of the first image light beam; the polaroid is used for absorbing light in the second polarization state and transmitting light in the first polarization state;
and the ambient light rays transmitted by the polarizer of the second optical unit, the third quarter-wave plate and the second transflective element are transmitted to the first optical unit in sequence.
In a preferred or optional embodiment, the first optical unit further includes a first transparent substrate, and the first quarter-wave plate, the first polarization beam splitting element, the first transparent substrate, the second polarization beam splitting element, and the second quarter-wave plate are sequentially attached and mounted; the second optical unit further comprises a second transparent substrate, and the second transflective element, the second transparent substrate, the third quarter-wave plate and the polarizer are sequentially attached and installed; the third optical unit further comprises a third transparent substrate, and the first semi-transparent semi-reflective element and the third transparent substrate are sequentially attached and mounted.
In a preferred or optional embodiment, the image unit, the first optical unit and the third optical unit are arranged in sequence along a vertical direction; the first optical unit and the second optical unit are sequentially arranged along a horizontal direction.
In a preferred or alternative embodiment, the image unit comprises a display screen and at least one lens; the display screen is used for emitting the image light; the lens is used for shaping the image light.
In a preferred or optional embodiment, both sides of the lens are plated with antireflection films.
The utility model also provides a wear-type augmented reality equipment, include: a spectacle frame, a spectacle leg and an optical system for augmented reality as described in any of the above; the glasses legs are arranged on two sides of the glasses frame respectively, the glasses frame forms an optical system containing cavity, and the optical system for augmented reality is arranged in the optical system containing cavity.
Drawings
Fig. 1 is a schematic structural diagram of an optical system for augmented reality according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optical system for augmented reality according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of an optical system for augmented reality according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first optical unit according to the embodiment of the present invention shown in fig. 3;
fig. 5 is a schematic structural diagram of a second optical unit according to the embodiment of the present invention shown in fig. 3;
fig. 6 is a schematic structural diagram of a third optical unit in the embodiment corresponding to fig. 3 according to the present invention.
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 some, not all, of the 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 efforts belong to the protection scope of the present invention.
Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings:
as shown in fig. 1, an optical system for augmented reality according to a first embodiment of the present invention includes: an image unit 10, a first optical unit 20, a second optical unit 30.
The image unit is configured to emit image light to the first optical unit, and specifically, the image unit 10 includes a display screen 11, and the display screen is configured to emit the image light, where in this embodiment, the image light is unpolarized light, i.e., natural light. The primary purpose of the display screen 11 is to provide a virtual image, which includes, but is not limited to, a display screen of an integrated light source or a single display screen, e.g., Micro-Oled, etc., display electronics, which may each emit image light. Preferably, the image unit further comprises at least one lens 12 for shaping the image light. When there are a plurality of lenses, the plurality of lenses may be grouped into a lens group. The lens surface of the lens can be spherical, aspherical or free-form, and the like, and preferably, both sides of the lens are plated with antireflection films, and the antireflection films can improve the optical transmission efficiency and reduce the possibility of generation of imaging ghost.
The first optical unit is used for reflecting the image light part into a first image light beam in a first polarization state, transmitting and converting the first image light beam into a circular polarization state or an elliptical polarization state, and then transmitting the first image light beam to the second optical unit; the second optical unit is used for reflecting the first image light beam to the first optical unit; the first optical unit is also used for transmitting and transforming the first image light beam reflected by the second optical unit into a second polarization state, and transmitting the second image light beam into human eyes; the second optical unit is also used for transmitting ambient light, and the ambient light transmitted by the second optical unit is transmitted to the first optical unit and enters human eyes after being transmitted. The first image light beam and the ambient light reach human eyes, namely the virtual image and the real scene image reach the human eyes, and the user can see the overlapped mixed image, so that the effect of augmented reality is achieved. The image unit, the first optical unit and the second optical unit may implement the above functions by different arrangements.
Referring to fig. 1, as an implementation manner, the first optical unit of the present embodiment includes a first quarter-wave plate 21 and a first polarization beam splitter 22 sequentially disposed along an image light emitting direction, where the first polarization beam splitter is configured to reflect light in a first polarization state and transmit light in a second polarization state; the first image light beam reflected by the second optical unit enters human eyes after being transmitted by the first quarter-wave plate and the first polarization beam splitting element of the first optical unit in sequence. It should be noted that, in this embodiment, the second optical unit may be a half-mirror. The first image beam is reflected to the first quarter-wave plate through the half-mirror. Ambient light can be transmitted through the transflective lens. The ambient light is transmitted through the second optical unit, the first quarter-wave plate and the first polarization light splitting element in sequence and enters human eyes.
The image light emitting direction, i.e. the direction from the image unit to the first optical unit, may also be understood as vertical downward. Preferably, the first quarter-wave plate 21 and the first polarization splitting element 22 are attached to each other, that is, they may be made as a single optical element, or in other embodiments, they may be two independent optical elements.
The first polarization beam splitting element may be a reflective polarization beam splitting sheet, a reflective polarization beam splitting film, or other optical elements for realizing polarization beam splitting, and those skilled in the art can select the type thereof according to different requirements. The polarization light splitting element can split completely unpolarized light (such as natural light) into two linearly polarized lights with orthogonal polarization directions, transmit one linearly polarized light and reflect the other linearly polarized light. The light in the first polarization state is linearly polarized light in a first polarization direction, the light in the second polarization state is linearly polarized light in a second polarization direction, and the first polarization direction can be defined as an S direction, the second polarization direction is a P direction, and the S direction is orthogonal to the P direction. Thus, light of the first polarization state may also be referred to as S-polarized light, and light of the second polarization state may likewise be referred to as P-polarized light.
The first quarter-wave plate can convert linearly polarized light into elliptically polarized light or circularly polarized light, or convert elliptically polarized light or circularly polarized light into linearly polarized light, wherein the circularly polarized light is a special case of the elliptically polarized light. The skilled person will understand the properties of the quarter wave plate, namely: when the S polarized light passes through the quarter-wave plate, the S polarized light is converted into elliptical polarized light or circular polarized light, and when the elliptical polarized light or the circular polarized light passes through the quarter-wave plate again, the S polarized light or the circular polarized light is converted into P polarized light; similarly, when P-polarized light passes through the quarter-wave plate, it is converted into elliptically or circularly polarized light, and when the elliptically or circularly polarized light passes through the quarter-wave plate again, it is converted into S-polarized light.
The image light may be partially transmitted by the first polarization splitting element as a second image light beam in a second polarization state, and in this embodiment, the second image light beam in the second polarization state is emitted to the external environment.
For ease of distinction, light rays with a first polarization state are labeled "●" in the figures; the light with the second polarization state is marked as a left-right arrow
Or an arrow in the up-down direction; light with a circular or elliptical polarization state is labeled "■"; marking image light rays (including the first image beam and the second image beam)
Labeling ambient light (including a first ambient light beam) as
Marking disturbing light rays as
Referring to fig. 1, the working principle of the optical system for augmented reality according to the present embodiment is described in detail as follows:
on the one hand, the display screen of the image unit emits image light, which is shaped and refracted by the lens of the image unit (the image light propagates to the first quarter-wave plate); the first quarter-wave plate transmits the image light (the image light is transmitted to the first polarization beam splitting element); the first polarization beam splitter reflects part of the image light into a first image beam in a first polarization state (the part of the image light is the first image beam which propagates to the first quarter-wave plate again), and the other part of the image light is transmitted into a second image beam in a second polarization state (the part of the image light is the second image beam which propagates to the external environment); the first quarter-wave plate transmits the first image light beam and transforms the polarization state of the light of the first image light beam into a circular polarization state or an elliptical polarization state (the first image light beam is transmitted to the second optical unit); the second optical unit partially reflects the first image beam (the part of the first image beam propagates to the first quarter-wave plate again), and partially transmits the first image beam (the part of the first image beam propagates to the external environment); the first quarter-wave plate transmits the first image light beam and transforms the polarization state of the light of the first image light beam into a second polarization state (the first image light beam is transmitted to the first polarization beam splitting element), and the first polarization beam splitting element transmits the first image light beam (the first image light beam is transmitted to human eyes), so that the virtual image displayed by the image unit can be seen by the human eyes. The polarization state of the light of the first image beam entering the human eye is the second polarization state.
On the other hand, the second optical unit partially transmits the ambient light (the ambient light propagates to the first quarter-wave plate), and partially reflects the ambient light (the ambient light propagates to the external environment); the first quarter-wave plate transmits ambient light (the ambient light is transmitted to the first polarization light splitting element), the first polarization light splitting element partially transmits the ambient light to be the ambient light in the second polarization state (the partial ambient light is transmitted to human eyes), and the other part reflects the ambient light to be the ambient light in the first polarization state (the partial ambient light is transmitted to the external environment), so that the human eyes can see real scenery images. At this time, the polarization state of the ambient light entering the human eyes is the second polarization state. The skilled person can position the optical elements to achieve the light propagation.
Based on the embodiment, when the virtual image and the real scenery image both reach the eyes of people, the user can see the superposed mixed image, thereby achieving the effect of augmented reality.
Fig. 2 is a schematic structural diagram of an optical system for augmented reality according to another embodiment of the present invention, please refer to fig. 2, it should be understood that the difference between this embodiment and the corresponding embodiment of fig. 1 is that the optical system for augmented reality further includes a third optical unit 40; the first optical unit is further used for partially transmitting the image light into a second image light beam in a second polarization state, transmitting and converting the second image light beam into a circular polarization state or an elliptical polarization state, and then transmitting the second image light beam to the third optical unit; the third optical unit is used for reflecting the second image light beam to the first optical unit, and the first optical unit is also used for transmitting and converting the second image light beam reflected by the third optical unit into a first polarization state, transmitting and converting the second image light beam reflected by the third optical unit into a circular polarization state or an elliptical polarization state again after reflection, and enabling the second image light beam to enter human eyes; the first optical unit is also used for transmitting and converting the first image light beam reflected by the second optical unit into a second polarization state, transmitting and converting the first image light beam into a circular polarization state or an elliptical polarization state and then entering human eyes; the third optical unit is also used for reflecting interference light rays, and the interference light rays reflected by the third optical unit enter the external environment.
In this embodiment, the first image light beam, the second image light beam and the ambient light all reach human eyes, that is, the virtual image (the first image light beam and the second image light beam) and the real scene image all reach human eyes, and the user can see the superimposed mixed image, thereby achieving the effect of augmented reality. In addition, in the augmented reality optical system, an interference light is inevitably generated, and the interference light generally enters from a side of the first optical unit facing away from the image light source and enters the human eye through reflection of the first optical unit, so the third optical unit is also located on the optical path where the interference light enters and can reflect the interference light. That is, the third optical unit may reflect not only the reflection of the second image beam but also the disturbance light. The image unit, the first optical unit, the second optical unit, and the third optical unit may implement the above functions by different arrangements.
Referring to fig. 2, as an implementation manner, the first optical unit 20 of this embodiment includes a first quarter-wave plate 21, a first polarization beam splitter 22, a second polarization beam splitter 23, and a second quarter-wave plate 24, which are sequentially disposed along an image light emitting direction, and both the first polarization beam splitter and the second polarization beam splitter are used for reflecting light in a first polarization state and transmitting light in a second polarization state; the third optical unit 40 comprises a first transflective element 41; the first image light beam reflected by the second optical unit sequentially passes through the first quarter-wave plate, the first polarization beam splitting element, the second polarization beam splitting element and the second quarter-wave plate and then enters human eyes after being transmitted; the second image beam reflected by the third optical unit is transmitted through the second quarter-wave plate of the first optical unit in sequence, reflected by the second polarization beam splitting element, transmitted through the second quarter-wave plate again and enters human eyes.
With respect to the embodiment shown in fig. 1, the first optical unit 20 of the present embodiment further includes a second polarization beam splitting element 23 and a second quarter-wave plate 24, and the optical system further includes a third optical unit 40, where the third optical unit 40 includes a first transflective element 41. The characteristics of the second polarization beam splitter 23 are the same as those of the first polarization beam splitter, and the characteristics of the second quarter-wave plate 24 are also the same as those of the first quarter-wave plate, which are not described herein again. The first transflective element can be a transflective film or a transflective lens, and the type of the first transflective element can be selected by one skilled in the art according to different requirements. In this embodiment, the first transflective element is a transflective film, and the range of the inverse transmittance ratio thereof can be configured as 0: 10 to 8: 2, the person skilled in the art can set the brightness and the contrast of the image according to the eye brightness, and preferably, the inverse transmission ratio is 0: and 10, realizing the maximum light energy utilization rate.
With respect to the corresponding embodiment of fig. 1, since the first optical unit further includes the second polarization beam splitting element and the second quarter wave plate, the propagation path of the first image beam also needs to pass through the above-mentioned optical elements. And the ambient light of this embodiment is transmitted through the second optical unit in turn, through the first quarter-wave plate, through the first polarization beam splitter, through the second quarter-wave plate, and into the human eye.
Preferably, the image unit, the first optical unit and the third optical unit are sequentially arranged along a vertical direction in the embodiment; the first optical unit and the second optical unit are sequentially arranged along a horizontal direction.
The following detailed description explains the working principle of an optical system for augmented reality provided by the corresponding embodiment of fig. 2:
on the one hand, the display screen of the image unit emits image light, which is shaped and refracted by the lens of the image unit (the image light propagates to the first quarter-wave plate); the first quarter-wave plate transmits the image light (the image light is transmitted to the first polarization beam splitting element); the first polarization beam splitter reflects part of the image light into a first image beam in a first polarization state (the part of the image light is the first image beam and propagates to the first quarter-wave plate again), and the other part of the image light is a second image beam in a second polarization state (the part of the image light is the second image beam and propagates to the second polarization beam splitter);
part of the first image beam (now polarized in the first polarization state): the first quarter-wave plate transmits the first image light beam and transforms the polarization state of the light of the first image light beam into a circular polarization state or an elliptical polarization state (the first image light beam is transmitted to the second optical unit); the second optical unit partially reflects the first image beam (the part of the first image beam propagates to the first quarter-wave plate again), and partially transmits the first image beam (the part of the first image beam propagates to the external environment); the first quarter-wave plate transmits the first image light beam and transforms the polarization state of the light beam into a second polarization state (the first image light beam is transmitted to the first polarization beam splitting element), and the first polarization beam splitting element transmits the first image light beam (the first image light beam is transmitted to the second polarization beam splitting element); the second polarization beam splitting element transmits the first image beam (the first image beam propagates to the second quarter-wave plate); the second quarter-wave plate transmits the first image light beam and transforms the polarization state of the light of the first image light beam into a circular polarization state or an elliptical polarization state (the first image light beam is transmitted to human eyes), so that the human eyes can see the virtual image displayed by the image unit. The polarization state of the light of the first image beam entering the human eye is a circular polarization state or an elliptical polarization state.
Part of the second image beam (with the polarization state at the second polarization state): the second polarization beam splitting element transmits the second image beam (the second image beam propagates to the second quarter-wave plate); the second quarter-wave plate transmits the second image light beam and transforms the polarization state of the light beam into a circular polarization state or an elliptical polarization state (the second image light beam is transmitted to the first transflective element); the first transflective element reflects the second image beam (the second image beam propagates to the second quarter-wave plate again); the second quarter-wave plate transmits the second image light beam and transforms the polarization state of the light beam into a first polarization state (the second image light beam is transmitted to the second polarization beam splitting element); the second polarization beam splitting element reflects the second image beam (the second image beam propagates to the second quarter-wave plate again); the second quarter-wave plate transmits the second image light beam and transforms the polarization state of the light beam into a circular polarization state or an elliptical polarization state (the second image light beam is transmitted to human eyes), so that the human eyes can see the virtual image displayed by the image unit. The polarization state of the light of the second image beam entering the human eye is a circular polarization state or an elliptical polarization state.
On the other hand, the second optical unit partially transmits the ambient light (the ambient light propagates to the first quarter-wave plate), and partially reflects the ambient light (the ambient light propagates to the external environment); the first quarter-wave plate transmits the ambient light (the ambient light is transmitted to the first polarization beam splitter), the first polarization beam splitter partially transmits the ambient light to be the ambient light in the second polarization state (the partial ambient light is transmitted to the second polarization beam splitter), and the other part reflects the ambient light to be the ambient light in the first polarization state (the partial ambient light is transmitted to the external environment); the second polarization beam splitting element transmits the ambient light (the ambient light propagates to the second quarter-wave plate); the second quarter-wave plate transmits ambient light and transforms the polarization state of the ambient light into a circular polarization state or an elliptical polarization state (the ambient light is transmitted to human eyes), so that the human eyes can see a real scene image. At this time, the polarization state of the ambient light entering the human eyes is circular polarization state or elliptical polarization state.
Based on the embodiment, when the virtual image and the real scenery image both reach the eyes of people, the user can see the superposed mixed image, thereby achieving the effect of augmented reality. In addition, in the present embodiment, the virtual image reaching the human eyes includes the first image light beam and the second image light beam, and compared with the embodiment corresponding to fig. 1, the present embodiment improves the light energy utilization rate of the entire optical system and reduces the aberration of the imaging image light beam, and the third optical unit provided in the present embodiment can also be used for reflecting the interference light to prevent the interference light from entering the human eyes.
Fig. 3 is a schematic structural diagram of an optical system for augmented reality according to another embodiment of the present invention, please refer to fig. 3, and the difference between the embodiment and the embodiment corresponding to fig. 2 mainly lies in: the second optical unit comprises a second half-wave plate 31, a third quarter-wave plate 32 and a polarizer 33 which are sequentially arranged along the incidence direction of the first image light beam; the polarizer 33 is used for absorbing the light in the second polarization state and transmitting the light in the first polarization state. And the ambient light rays transmitted by the polarizer of the second optical unit, the third quarter-wave plate and the second transflective element are transmitted to the first optical unit in sequence.
The second transflective element 31 may be a transflective film or a transflective lens, and those skilled in the art can select the type thereof according to different requirements. In this embodiment, the second transflective element is a transflective film, and the range of the inverse transmittance ratio thereof can be configured as 2: 8 to 8: 2, the person skilled in the art can set the brightness and the image contrast according to the eye.
The third quarter-wave plate 32 has the same characteristics as the first quarter-wave plate, and is not described in detail herein.
It is understood that, for the purpose of the polarizer not transmitting a portion of light, one skilled in the art may configure the polarizer based on the actually required and possible characteristics of the polarizer 33 on the market, such as configuring the polarizer to reflect light in the first polarization state, and further such as configuring the polarizer to absorb light in the second polarization state and transmit light in the first polarization state, in this embodiment, the polarizer is configured to have the characteristics as the latter.
As shown in the embodiment corresponding to fig. 1 and the embodiment corresponding to fig. 2, when the first image beam passes through the second optical unit, a portion of light is transmitted to the external environment, and the portion of the first image beam is directly exposed to the external environment by the information displayed by the user, which is not beneficial to privacy protection.
The utility model provides a first optical unit, second optical unit and third optical unit, the optical element that the three includes all can be independent setting, also can laminate the installation each other. Referring to fig. 4-6, in the present embodiment, the first optical unit 20 further includes a first transparent substrate 25, and the first quarter-wave plate 21, the first polarization beam splitter 22, the first transparent substrate 25, the second polarization beam splitter 23, and the second quarter-wave plate 24 are sequentially attached and mounted; the second optical unit 30 further includes a second transparent substrate 34, and the second transflective element 31, the second transparent substrate 34, the third quarter-wave plate 32 and the polarizer 33 are sequentially attached to each other; the third optical unit further comprises a third transparent substrate 42, and the first transflective element 41 and the third transparent substrate 42 are sequentially attached and mounted. The mirror surfaces of the first optical unit, the second optical unit and the third optical unit which are installed in a fitting mode can be spherical surfaces or aspherical surfaces or free-form surfaces. The transparent substrate is provided as an optical element, and in other embodiments, other ways of mounting an optical element may be used, wherein the transparent substrate does not affect the propagation of light, and therefore the following working principle does not relate to the description of the transparent substrate.
The following describes the working principle of the optical system for augmented reality according to the present embodiment in detail:
on the one hand, the display screen of the image unit emits image light, which is shaped and refracted by the lens of the image unit (the image light propagates to the first quarter-wave plate); the first quarter-wave plate transmits the image light (the image light is transmitted to the first polarization beam splitting element); the first polarization beam splitter reflects part of the image light into a first image beam in a first polarization state (the part of the image light is the first image beam and propagates to the first quarter-wave plate again), and the other part of the image light is a second image beam in a second polarization state (the part of the image light is the second image beam and propagates to the second polarization beam splitter);
part of the first image beam (now polarized in the first polarization state): the first quarter-wave plate transmits the first image light beam and transforms the polarization state of the light of the first image light beam into a circular polarization state or an elliptical polarization state (the first image light beam is transmitted to the second transflective element); the second half-transmitting and half-reflecting element partially reflects the first image light beam (the part of the first image light beam is defined as a, a propagates to the first quarter-wave plate again), and transmits the other part (the part of the first image light beam is defined as b, b propagates to the third quarter-wave plate);
part a: the first quarter-wave plate transmits the first image light beam and transforms the polarization state of the light beam into a second polarization state (the first image light beam is transmitted to the first polarization beam splitting element), and the first polarization beam splitting element transmits the first image light beam (the first image light beam is transmitted to the second polarization beam splitting element); the second polarization beam splitting element transmits the first image beam (the first image beam propagates to the second quarter-wave plate); the second quarter-wave plate transmits the first image light beam and transforms the polarization state of the light of the first image light beam into a circular polarization state or an elliptical polarization state (the first image light beam is transmitted to human eyes), so that the human eyes can see the virtual image displayed by the image unit. The polarization state of the light of the first image beam entering the human eye is a circular polarization state or an elliptical polarization state.
And b part: the third quarter-wave plate transmits the first image beam and transforms the polarization state of the light to the second polarization state (the first image beam is transmitted to the polarizer), the polarizer absorbs the first image beam, and the polarization state of the light of the first image beam absorbed by the polarizer is the second polarization state.
Part of the second image beam (with the polarization state at the second polarization state): this part is the same as embodiment 2 and therefore will not be described.
On the other hand, the polarizer partially transmits the ambient light to the first ambient light beam of the first polarization state (the portion of the ambient light propagates to the third quarter-wave plate), and reflects or absorbs another portion (the portion of the ambient light propagates to the external environment); the third quarter-wave plate transmits the first environment light beam and transforms the polarization state of the light beam into a circular polarization state or an elliptical polarization state (the first environment light beam is transmitted to the second transflective element), the second transflective element partially transmits the first environment light beam (the part of the first environment light beam is transmitted to the first quarter-wave plate) and reflects the other part of the first environment light beam (the part of the environment light beam is transmitted through the third quarter-wave plate and absorbed by the polarizer); the first quarter-wave plate transmits the first environment light beam and transforms the polarization state of the light beam into a second polarization state (the first environment light beam is transmitted to the first polarization beam splitting element); the first polarization beam splitting element transmits the first ambient light beam (the first ambient light beam propagates to the second polarization beam splitting element); the second polarization beam splitting element transmits the first ambient light beam (the first ambient light beam propagates to the second quarter-wave plate); the second quarter-wave plate transmits the first environment light beam and transforms the polarization state of the light of the first environment light beam into a circular polarization state or an elliptical polarization state (the first environment light beam is transmitted to human eyes); thereby enabling the human eye to see a real scene image. At this time, the polarization state of the ambient light entering the human eyes is circular polarization state or elliptical polarization state.
Based on the embodiment, when the virtual image and the real scenery image both reach the eyes of people, the user can see the superposed mixed image, thereby achieving the effect of augmented reality. In addition, in this embodiment, the first image light beam b is not transmitted to the outside, but is directly absorbed by the second optical unit, and compared with the embodiment corresponding to fig. 2, this embodiment can also prevent the image information from being directly exposed to the external environment, and ensure the privacy of the optical system.
The advantages of this embodiment are:
1. the third optical unit is adopted to reflect and utilize the image light rays downwards transmitted to the environment, so that the light energy utilization rate of the whole optical system can be improved; meanwhile, the problem that interference is generated to imaging when upward interference light is reflected to human eyes through the first optical unit is solved;
2. the whole polarization solution is provided, the problem of leakage of image light in the horizontal direction is solved, and the privacy of a user is protected.
The utility model also provides a wear-type augmented reality equipment, it includes: a spectacle frame, a spectacle arm and an optical system for augmented reality as described in any of the above embodiments; the glasses legs are arranged on two sides of the glasses frame respectively, the glasses frame forms an optical system containing cavity, and the optical system for augmented reality is arranged in the optical system containing cavity. The optical system is installed in the optical system cavity, which is a common technique for those skilled in the art, and therefore, will not be described in detail.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. An optical system for augmented reality, comprising: an image unit, a first optical unit and a second optical unit;
the image unit is used for emitting image light to the first optical unit; the first optical unit is used for reflecting the image light part into a first image light beam in a first polarization state, transmitting and converting the first image light beam into a circular polarization state or an elliptical polarization state, and then transmitting the first image light beam to the second optical unit; the second optical unit is used for reflecting the first image light beam to the first optical unit; the first optical unit is also used for transmitting and transforming the first image light beam reflected by the second optical unit into a second polarization state, and transmitting the second image light beam into human eyes; the second optical unit is also used for transmitting ambient light, and the ambient light transmitted by the second optical unit is transmitted to the first optical unit and enters human eyes after being transmitted.
2. The optical system for augmented reality of claim 1, wherein: the first optical unit comprises a first quarter-wave plate and a first polarization light splitting element which are sequentially arranged along the emitting direction of the image light; the first polarization light splitting element is used for reflecting light in a first polarization state and transmitting light in a second polarization state;
the first image light beam reflected by the second optical unit enters human eyes after being transmitted by the first quarter-wave plate and the first polarization beam splitting element of the first optical unit in sequence.
3. The optical system for augmented reality of claim 1, wherein: further comprising a third optical unit; the first optical unit is further used for partially transmitting the image light into a second image light beam in a second polarization state, transmitting and converting the second image light beam into a circular polarization state or an elliptical polarization state, and then transmitting the second image light beam to the third optical unit; the third optical unit is used for reflecting the second image light beam to the first optical unit, and the first optical unit is also used for transmitting and converting the second image light beam reflected by the third optical unit into a first polarization state, transmitting and converting the second image light beam reflected by the third optical unit into a circular polarization state or an elliptical polarization state again after reflection, and enabling the second image light beam to enter human eyes;
the first optical unit is also used for transmitting and converting the first image light beam reflected by the second optical unit into a second polarization state, transmitting and converting the first image light beam into a circular polarization state or an elliptical polarization state and then entering human eyes; the third optical unit is also used for reflecting interference light rays, and the interference light rays reflected by the third optical unit enter the external environment.
4. The optical system for augmented reality of claim 3, wherein: the optical unit comprises a first quarter-wave plate, a first polarization beam splitting element, a second polarization beam splitting element and a second quarter-wave plate which are sequentially arranged along the image light emitting direction, and the first polarization beam splitting element and the second polarization beam splitting element are used for reflecting light in a first polarization state and transmitting light in a second polarization state; the third optical unit comprises a first transflective element;
the first image light beam reflected by the second optical unit sequentially passes through the first quarter-wave plate, the first polarization beam splitting element, the second polarization beam splitting element and the second quarter-wave plate and then enters human eyes after being transmitted;
the second image beam reflected by the third optical unit is transmitted through the second quarter-wave plate of the first optical unit in sequence, reflected by the second polarization beam splitting element, transmitted through the second quarter-wave plate again and enters human eyes.
5. The optical system for augmented reality of claim 4, wherein: the second optical unit comprises a second half-transmitting and half-reflecting element, a third quarter-wave plate and a polarizer which are sequentially arranged along the incidence direction of the first image light beam; the polaroid is used for absorbing light in the second polarization state and transmitting light in the first polarization state;
and the ambient light rays transmitted by the polarizer of the second optical unit, the third quarter-wave plate and the second transflective element are transmitted to the first optical unit in sequence.
6. The optical system for augmented reality of claim 5, wherein: the first optical unit further comprises a first transparent substrate, and the first quarter-wave plate, the first polarization beam splitting element, the first transparent substrate, the second polarization beam splitting element and the second quarter-wave plate are sequentially attached and installed; the second optical unit further comprises a second transparent substrate, and the second transflective element, the second transparent substrate, the third quarter-wave plate and the polarizer are sequentially attached and installed; the third optical unit further comprises a third transparent substrate, and the first semi-transparent semi-reflective element and the third transparent substrate are sequentially attached and mounted.
7. An optical system for augmented reality according to any one of claims 3-6, wherein: the image unit, the first optical unit and the third optical unit are sequentially arranged along the vertical direction; the first optical unit and the second optical unit are sequentially arranged along a horizontal direction.
8. An optical system for augmented reality according to any one of claims 1-6, wherein: the image unit comprises a display screen and at least one lens; the display screen is used for emitting the image light; the lens is used for shaping the image light.
9. The optical system for augmented reality of claim 8, wherein: and antireflection films are plated on two sides of the lens.
10. A head-mounted augmented reality device, comprising: spectacle frame, spectacle arm and optical system for augmented reality as claimed in any one of claims 1 to 9; the glasses legs are arranged on two sides of the glasses frame respectively, the glasses frame forms an optical system containing cavity, and the optical system for augmented reality is arranged in the optical system containing cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021586259.6U CN212694162U (en) | 2020-08-03 | 2020-08-03 | Optical system for augmented reality and head-mounted augmented reality device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021586259.6U CN212694162U (en) | 2020-08-03 | 2020-08-03 | Optical system for augmented reality and head-mounted augmented reality device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212694162U true CN212694162U (en) | 2021-03-12 |
Family
ID=74901455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021586259.6U Active CN212694162U (en) | 2020-08-03 | 2020-08-03 | Optical system for augmented reality and head-mounted augmented reality device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212694162U (en) |
-
2020
- 2020-08-03 CN CN202021586259.6U patent/CN212694162U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107589546B (en) | Optical system and augmented reality glasses | |
| US11624915B2 (en) | Near-eye display device and near-eye display method | |
| CN111025659B (en) | Augmented reality optical module and augmented reality equipment | |
| CN210072209U (en) | Near-to-eye display optical machine and near-to-eye display equipment | |
| JP2020510859A (en) | Method and system for display device with integrated polarizer | |
| CN206684389U (en) | A kind of optics module and augmented reality glasses | |
| CN107065181B (en) | Optical system of virtual reality equipment | |
| CN107065189B (en) | optical module and augmented reality glasses | |
| CN111399224A (en) | Display optical system and head-mounted display device | |
| EP4303641A1 (en) | Near-to-eye display optical system, optical filter and near-to-eye display device | |
| CN112130332B (en) | Augmented reality display structure and AR (augmented reality) equipment applying same | |
| CN111338086A (en) | Display optical system and head-mounted display device | |
| CN210488131U (en) | Optical module and intelligent glasses | |
| CN209842246U (en) | Optical module and augmented reality device | |
| CN213069318U (en) | Catadioptric display optical machine and near-to-eye display equipment | |
| CN114063286A (en) | Optical system for augmented reality and head-mounted augmented reality device | |
| CN112051671B (en) | Near-eye display optical machine, near-eye display method and near-eye display equipment | |
| CN212694162U (en) | Optical system for augmented reality and head-mounted augmented reality device | |
| CN216248599U (en) | Augmented reality display system and AR glasses | |
| CN115437153A (en) | Near-to-eye display optical system and VR display equipment | |
| CN211528822U (en) | Optical system and augmented reality device | |
| CN208737102U (en) | Optical system and augmented reality glasses | |
| CN214954332U (en) | Single-image-source binocular augmented reality optical device and augmented reality equipment | |
| CN211979335U (en) | Display optical system and head-mounted display device | |
| CN111025638A (en) | AR optical display module and augmented reality equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |