CN117850049A - Ray apparatus and AR equipment - Google Patents

Abstract

The application discloses ray apparatus and AR equipment relates to the optics and shows technical field, the ray apparatus of this application, include along the laser source that first direction set gradually, collimating lens and first prism, the both sides face of first prism along first direction is refracting surface and polarization plane respectively, refracting surface and polarization plane are connected and have first contained angle of predetermineeing, one side of first prism along the second direction has set gradually 1/4 wave plate and scanning galvanometer, the light beam of laser source outgoing is through the collimating lens back incident refracting surface, the refraction carries out the refraction extension back incident polarization plane to the light beam, first polarization state light beam among the polarization plane reflection light beam, first polarization state light beam sees through 1/4 wave plate and sees through the reflection back of scanning galvanometer again and sees through 1/4 wave plate and form the second polarization state light beam, the second polarization state light beam sees through the polarization plane and then goes out. The optical machine and the AR equipment can reduce the grid phenomenon in the emergent image and improve the image quality.

Description

Ray apparatus and AR equipment

Technical Field

The application relates to the technical field of optical display, in particular to an optical machine and AR equipment.

Background

Augmented Reality (AR) technology is a technology that superimposes virtual information into the real world, providing a user with an interactive environment that merges real and virtual. With the continuous development of AR technology, its application in various fields is becoming more and more widespread, from games, entertainment to medical treatment, education, etc. The display technology of AR devices is also continually advancing in order to provide more realistic and high quality virtual images.

In AR technology, the design of the optomachine, i.e. the micro projector, is a key one. The device is matched with the waveguide, a virtual image is projected into the waveguide, and imaging is completed in human eyes after the virtual image passes through the propagation pupil expansion of the waveguide. Among projection schemes of an optical machine, a laser scanning projection (Optical Scanning Display, OSD) scheme has the advantages of high brightness, high contrast, compact optical path, good design and the like, and is one of the important research directions in the industry.

However, the OSD scheme has a certain disadvantage at present, the light source of the OSD scheme is a laser light source, and the laser is a non-lambertian light source, which results in that when the OSD is used as a projection scheme of an optical machine, different light beams included in the OSD are separated, a certain gap exists between each separated light beam, and therefore many grids may exist in the finally formed image. This affects the overall look and feel of the AR device, reducing the user's use experience.

Disclosure of Invention

The purpose of the application is to provide an optical machine and AR equipment, which can reduce the grid phenomenon in an emergent image and improve the image quality.

The embodiment of the application provides an on the one hand, include along laser source, collimating lens and the first prism that first direction set gradually, the both sides face of first direction is refracting surface and polarization plane respectively along first prism, refracting surface and polarization plane are connected and have first contained angle of predetermineeing, one side of first prism along the second direction has set gradually 1/4 wave plate and scanning galvanometer, the light beam of laser source outgoing is through the incident refraction plane behind the collimating lens collimation, the refraction carries out the refraction extension back to the light beam and incident the polarization plane, first polarization state light beam in the polarization plane reflection light beam, first polarization state light beam is through 1/4 wave plate and is through the reflection back of scanning galvanometer again through 1/4 wave plate formation second polarization state light beam, the second polarization state light beam is through the polarization plane back emergence.

As an implementation manner, the surface of the first prism close to the 1/4 wave plate is a transmission surface, the transmission surface comprises a reflecting part and a transmitting part which are connected with each other, the reflecting part is used for reflecting the light beam refracted by the refraction surface to the polarization surface, and the transmitting part is used for transmitting the first polarized light beam emitted by the polarization surface.

As an embodiment, the transparent side and the refractive side have a second predetermined angle, which is between 20 ° and 60 °.

As an embodiment, the reflecting portion is further provided with a reflecting member.

As an implementation manner, the optical engine further comprises a second prism arranged on one side, far away from the collimating lens, of the first prism along the first direction, and the second prism is attached to the first prism and the 1/4 wave plate.

As an embodiment, the maximum length of the first prism in the first direction is between 4.5 and 5.5mm and the minimum length of the second prism in the first direction is between 0.25 and 0.35 mm.

As an embodiment, the width of the light beam before the refractive surface is D, and the width of the light beam after the refractive expansion of the refractive surface is D, where D and D satisfy the following relation:wherein θ is a second preset included angle, and n is the refractive index of the first prism.

As an implementation manner, a heat dissipation piece is further arranged on one side of the laser source along the second direction and is used for dissipating heat of the laser source.

In another aspect, an embodiment of the present application provides an AR device, including the optical machine and an optical waveguide disposed at an optical output side of the optical machine, where an image beam emitted by the optical machine is projected to a coupling-in area of the optical waveguide, and a distance between a first prism of the optical machine and the coupling-in area is less than or equal to 5mm.

The beneficial effects of the embodiment of the application include:

the utility model provides a ray apparatus, include along the laser source that first direction set gradually, collimating lens and first prism, the both sides face of first direction is refracting surface and polarization plane respectively along first direction for first prism, refracting surface and polarization plane are connected and have first contained angle of predetermineeing, first prism has set gradually 1/4 wave plate and scanning galvanometer along one side of second direction, the light beam of laser source outgoing is through the incident refraction face behind collimating lens collimation, the refraction carries out refraction extension back incidence polarization plane to the light beam, the width of the light beam after the extension increases, first polarization state light beam in the polarization plane reflection light beam, first polarization state light beam is through 1/4 wave plate and is through the reflection back of scanning galvanometer again 1/4 wave plate formation second polarization state light beam, exit after the polarization plane is passed through to the second polarization state light beam, after the width of light beam increases, can make up the clearance between each light beam, thereby reduce the clearance between each laser beam of output image light, when the ray apparatus is applied to AR equipment, grid phenomenon in the emergent image can be alleviateed, image quality is promoted.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an optical engine according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of an optical path of an optical machine according to an embodiment of the present application;

FIG. 3 is a schematic diagram illustrating an optical path analysis of an optical bench according to an embodiment of the present disclosure;

FIG. 4 is a second schematic diagram of a light engine according to an embodiment of the present disclosure;

FIG. 5 is a second schematic diagram of an optical path of an optical engine according to an embodiment of the present disclosure;

FIG. 6 is a second optical path analysis diagram of an optical bench according to an embodiment of the present disclosure;

FIG. 7 is a third schematic diagram of a light engine according to the embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an AR device according to an embodiment of the present application;

FIG. 9 is a graph of the output frequency spectrum of a prior art optical engine;

fig. 10 is an output frequency spectrum of the optical engine according to the embodiment of the present application.

Icon: 100-ray machine; 110-a laser source; 120-a collimating lens; 130-a first prism; 131-refractive surface; 132-plane of polarization; 133-a reverse-permeable face; 134-a reflecting section; 135-transmitting part; 136-a reflector; a 140-1/4 wave plate; 150-scanning a galvanometer; 160-a second prism; 170-a heat sink; 210-an optical waveguide; 211-a coupling-in region; 212-out-coupling region.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, the terms "center," "vertical," "horizontal," "inner," "outer," and the like indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship that a product of the application is conventionally put in use, merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

The OSD light machine has the advantages of high brightness, high contrast, simple light path and the like, but because the light source adopted by the OSD light machine is a laser light source, the laser is a non-lambertian light source, and the light energy in all directions is different. The light beams emitted by the OSD light machine comprise different light beams, the different light beams can be separated, a certain gap exists between each light beam, and when the OSD light machine is applied to AR equipment, the AR equipment has a plurality of grids in final imaging, so that the use experience of a user is affected.

The application provides a ray apparatus 100, as shown in fig. 1 to 6, including laser source 110 that sets gradually along the first direction, collimating lens 120 and first prism 130, the both sides face of first prism 130 along the first direction is refracting surface 131 and polarizing surface 132 respectively, refracting surface 131 and polarizing surface 132 are connected and have first contained angle of predetermineeing, one side of first prism 130 along the second direction has set gradually 1/4 wave plate 140 and scanning galvanometer 150, the light beam that laser source 110 was emergent is incident refracting surface 131 after collimating lens 120 collimation, refracting surface 131 carries out refraction extension back incident polarizing surface 132 to the light beam, first polarization state light beam in the polarizing surface 132 reflection light beam, first polarization state light beam is transmitted through 1/4 wave plate 140 and is formed the second polarization state light beam after the reflection of scanning galvanometer 150 is transmitted through 1/4 wave plate 140 again, the second polarization state light beam is transmitted through polarizing surface 132 and is emergent.

As shown in fig. 1 and 2, the optical engine 100 includes a laser source 110, a collimating lens 120, and a first prism 130 disposed along a first direction, where two sides of the first prism 130 along the first direction are respectively a refractive surface 131 and a polarizing surface 132, when a beam emitted from the laser source 110 is collimated by the collimating lens 120, a horizontal beam incident refractive surface 131 is formed, and since the first prism 130 has a refractive index difference with air, the refractive surface 131 can refract and expand the beam, so that the beam is widened, when the laser beams include respective laser beams, and a gap is formed between the laser beams, the beam widening can reduce the gap between the laser beams, and when the beam sequentially passes through the reflection of the polarizing surface 132, the first transmission of the 1/4 wave plate 140, the reflection of the scanning galvanometer 150, the second transmission of the 1/4 wave plate 140, and the reflection of the polarizing surface 132, the gap between the respective laser beams of the output image light is reduced, and when the optical engine 100 is applied to an AR device, the grid phenomenon in an emitted image can be reduced, and the image quality is improved.

Specifically, the light beam emitted from the laser source 110 passes through the collimating lens 120 to form parallel light, the parallel light enters the refraction surface 131, the refraction surface 131 refracts and expands the parallel light beam to enter the polarization surface 132, the polarization surface 132 is used for reflecting the light beam with the first polarization state, and for example, the first polarization state is S polarized light, so that the S polarized light beam in the light beam is reflected and transmitted through the 1/4 wave plate 140 to become circularly polarized light, and the circularly polarized light is reflected through the scanning galvanometer 150 and transmitted through the 1/4 wave plate 140 again to become P polarized light, and therefore the P polarized light is emitted through the polarization surface 132 to form an emergent light beam.

The above description is given taking the first polarization state as S polarized light as an example, that is, the polarization plane 132 is used to reflect S polarized light and transmit P polarized light, but is not limited to this application. I.e., the polarization plane 132 may also be used to reflect P-polarized light and transmit S-polarized light.

The 1/4 wave plate 140 is used for changing the polarization state of light, and after the linearly polarized light passes through the 1/4 wave plate 140, the optical path difference is changed by 1/4 wavelength, so that the phase difference is changed to be pi/2, and the polarization state of the light is changed to be circularly polarized light. The circularly polarized light is incident on the scanning galvanometer 150, reflected by the scanning galvanometer 150, passes through the 1/4 wave plates again, and is changed into linearly polarized light again, but the polarization direction of the linearly polarized light is perpendicular to the original polarization direction. For example, assuming that the polarization plane 132 reflects S-polarized light and transmits P-polarized light, the linearly polarized light before passing through the 1/4 wave plate 140 for the first time is S-polarized light, and the polarized light after passing through the 1/4 wave plate 140 twice is P-polarized light.

In addition, the specific structure of the collimator lens 120 is not limited in the embodiment of the present application, and may be a convex lens as long as it can collimate the light beam. The polarizing surface 132 is provided with a polarizing member for reflecting or transmitting a light beam, and the polarizing member may be a polarizing beam splitter film, for example.

The optical engine 100 provided by the application comprises a laser source 110, a collimating lens 120 and a first prism 130 which are sequentially arranged along a first direction, wherein two side surfaces of the first prism 130 along the first direction are respectively a refraction surface 131 and a polarization surface 132, the refraction surface 131 and the polarization surface 132 are connected and have a first preset included angle, one side of the first prism 130 along a second direction is sequentially provided with a 1/4 wave plate 140 and a scanning vibrating mirror 150, a light beam emitted by the laser source 110 is collimated by the collimating lens 120 and then enters the refraction surface 131, the refraction surface 131 refracts and expands the light beam and then enters the polarization surface 132, the width of the expanded light beam is increased, the polarization surface 132 reflects a first polarized light beam in the light beam, the first polarized light beam penetrates through the 1/4 wave plate 140 and then penetrates through the 1/4 wave plate 140 again after being reflected by the scanning vibrating mirror 150, the second polarized light beam penetrates through the polarization surface 132 and then exits, after the width of the light beam is increased, gaps among the light beams can be reduced, accordingly, gaps among the laser beams of an output image light can be reduced, and when the optical engine 100 is applied to AR equipment, the grid phenomenon in an image quality can be improved.

Alternatively, as shown in fig. 2 and 5, the surface of the first prism 130 near the 1/4 wave plate 140 is a transparent surface 133, the transparent surface 133 includes a reflective portion 134 and a transmissive portion 135 connected to each other, the reflective portion is configured to reflect the light beam refracted by the refractive surface 131 to the polarizing surface 132, and the transmissive portion 135 is configured to transmit the light beam of the first polarization state exiting through the polarizing surface 132.

As shown in fig. 2, according to the refractive optical path of the refractive surface 131, the light beam needs to be reflected on the transparent surface 133 before being incident on the polarizing surface 132, and the transparent surface 133 needs to be transmitted for the light beam in the first polarization state reflected by the polarizing surface 132, so in this embodiment of the present application, the surface of the first prism 130 near the 1/4 wave plate 140 is set as the transparent surface 133, the transparent surface 133 includes a reflective portion 134 and a transmissive portion 135 connected to each other, the reflective portion is used for reflecting the light beam refracted by the refractive surface 131 to the polarizing surface 132, and the transmissive portion 135 is used for transmitting the light beam in the first polarization state emitted by the polarizing surface 132.

In one implementation manner of this embodiment, the transparent surface 133 and the refractive surface 131 have a second preset included angle, and the second preset included angle is between 20 ° and 60 °.

The second preset included angle is an included angle between the transparent surface 133 and the refracting surface 131, the light beam enters the refracting surface 131 along the horizontal direction (the first direction), the refracting surface 131 refracts and expands the light beam, specifically, D is a width of the light beam emitted by the laser source 110 after being collimated by the collimating lens 120, the width of the light beam after being refracted by the refracting surface 131 is D, α is a refraction angle of the light beam, and each parameter in fig. 3 satisfies the relation:

assuming that the incident surface is air, the refractive index is 1, the refractive index of the first prism 130 is n, and the relationship is satisfied according to the law of refraction:

calculated according to the relation (1.1) and the relation (1.2), the following is obtained:

as can be seen from the relation (1.3), the width D of the light beam behind the refractive surface 131 is related to the width D of the light beam in front of the refractive surface 131, the refractive index n of the first prism 130, and the second preset angle θ, that is, when the width D of the light beam in front of the refractive surface 131 is constant, the magnification of the light beam can be set by adjusting the refractive index n of the first prism 130 and the second preset angle θ. As can be seen from the relation (1.3), the larger the refractive index n of the first prism 130, the larger D, and the larger the magnification of the light beam.

Specifically, the second preset included angle is not limited in this embodiment, and may be 45 ° as shown in fig. 1 and fig. 2 or 30 ° as shown in fig. 6, for example.

For example, when the second preset included angle is 45 °, i.e., θ in fig. 3 is 45 °, assuming n is 1.5, d=1.25D can be derived from the relation (1.3), i.e., the beam width after refraction expansion is 1.25 times the beam width before refraction expansion, and when the width of each beam is increased by 1.25 times, the gap between the respective beams is reduced, thereby reducing the grid of the output image light. For example, when the optical bench 100 is applied to an AR device, assuming that the distance between the light exit surface of the optical bench 100 and the coupling-in region 211 of the optical waveguide 210 is set to 1mm, and the interval between the respective light beams at the coupling-in region 211 is 0.25mm, the width of the light beam before refraction and expansion is 1mm, the width after refraction and expansion is 1.25mm, and the interval between the respective laser beams after the width of 1.25mm after refraction and expansion is shortened to 0mm, that is, there is no gap between the respective laser beams, which can eliminate the raster phenomenon of the image in theory.

For example, when the second preset included angle is 30 °, i.e., θ in fig. 6 is 30 °, assuming n is 1.6, d=1.68D can be derived from the relation (1.3), i.e., the beam width after refraction expansion is 1.68 times the beam width before refraction expansion, and when the width of each beam is increased by 1.68 times, the gap between the respective beams is reduced, thereby reducing the grid of the output image light. For example, when the optical bench 100 is applied to an AR device, it is assumed that the distance between the light exit surface of the optical bench 100 and the coupling-in region 211 of the optical waveguide 210 is 1mm, the distance between the respective light beams at the coupling-in region 211 is 0.2mm, the width of the light beam before refraction and expansion is 1mm, the width after refraction and expansion is 1.68mm, the distance between the respective laser beams after refraction and expansion is reduced to-0.48 mm, and the negative sign indicates that the different laser beams overlap each other, which means that the formed image is more uniform as a whole.

Optionally, as shown in fig. 3, the reflecting portion 134 is further provided with a reflecting member 136.

The reflecting portion 134 is provided with a reflecting member 136, and the reflecting member 136 can increase the reflectivity of the reflecting portion 134 so that more light beams are reflected, thereby reducing refraction and transmission of the laser beams at the reflecting portion, avoiding energy loss of the light beams at the reflecting portion 134, and reducing the intensity of the output image light.

The specific structure and reflectivity of the reflecting member 136 are not limited in this embodiment, and a person skilled in the art may perform specific setting according to practical situations, and as shown in fig. 3, the reflecting member 136 is an reflecting film, and the reflecting film occupies a smaller volume, so that the volume of the optical machine 100 can be reduced, and the optical machine 100 is conveniently applied to an AR device. The reflectivity of the reflecting film is more than 90 percent so as to improve the reflecting effect of the reflecting film.

In one implementation manner of the embodiment of the present application, as shown in fig. 4 and 5, the optical engine 100 further includes a second prism 160 disposed on a side of the first prism 130 away from the collimating lens 120 along the first direction, where the second prism 160 is attached to the first prism 130 and the 1/4 wave plate 140.

As can be seen from the above, the light beam is refracted by the refraction surface 131 and reflected by the reflection portion 134, and then is incident on the polarization surface 132, the polarization surface 132 reflects the light beam with the first polarization state, and when the polarization surface 132 reflects the light beam with the first polarization state, the light beam is refracted due to the polarization surface 132 being located at the cross section of the first prism 130 and the air, so as to avoid refraction of the light beam, as shown in fig. 2, the light beam deflection is unfavorable for the cooperation of the optical machine and other components of the AR device. According to the embodiment of the application, the second prism 160 is arranged on one side, far away from the collimating lens 120, of the first prism 130 along the first direction, the second prism 160 is attached to the first prism 130 and the 1/4 wave plate 140, the second prism 160 covers the polarization plane 132, the polarization plane 132 is located between the first prism 130 and the second prism 160, the light beam passes through the polarization plane 132 along the straight line, the emergent direction of the light beam is the vertical direction, and the problems are avoided.

Alternatively, as shown in fig. 7, the maximum length of the first prism 130 in the first direction is between 4.5-5.5mm, and the minimum length of the second prism 160 in the first direction is between 0.25-0.35 mm.

As can be seen from the foregoing, the second prism 160 is used to reduce the light loss, and the second prism 160 can be reduced in size as much as possible in order to reduce the length of the optical engine 100 in the first direction without affecting the function of the second prism 160. Specifically, the second prism 160 needs to completely cover the second polarization plane 132 to achieve the effect of reducing light loss, and a certain length of the second prism 160 is required to be provided at each position along the first direction to increase the strength of the second prism 160, on the basis that the minimum length of the second prism 160 along the first direction is set between 0.250.25 and 0.35 mm.

It is understood that the maximum length in the first direction refers to the longest value among all lengths in the first direction. Likewise, the minimum length in the first direction means the minimum value among all the lengths in the first direction. As shown in fig. 7, the maximum length of the first prism 130 along the first direction is the length of the lower surface of the first prism 130 along the first direction, and the minimum length of the second prism 160 along the first direction is the length of the lower surface of the second prism 160.

For example, the maximum length of the first prism 130 in the first direction is 5mm, and the minimum size of the second prism 160 in the first direction is 0.3mm.

As can be seen from the relation (1.3), the larger the refractive index n of the first prism 130, the larger D, and the larger the magnification of the light beam. Therefore, the refractive index of the first prism 130 should be set to be large within a limited range to increase the magnification of the light beam. In the existing prism materials, the refractive index is larger between 1.8 and 2.0, and thus, the embodiment of the present application sets the refractive index of the first prism 130 between 1.8 and 2.0.

The refractive index of the first prism 130 and the refractive index of the second prism 160 may be the same or different, and the refractive index of each of the first prism 130 and the second prism 160 may be 1.8 or 2.0, for example.

Alternatively, as shown in fig. 3 and 6, the width of the light beam before the refractive surface 131 is D, and the width of the light beam after refractive expansion by the refractive surface 131 is D, where D and D satisfy the following relation:where θ is a second preset included angle, and n is a refractive index of the first prism 130.

In one implementation manner of this embodiment, a heat dissipation member 170 is further disposed at one side of the laser source 110 along the second direction, for dissipating heat of the laser source 110.

When the laser source 110 emits laser beams, heat is generated, and the heat dissipation piece 170 is arranged at one side of the second direction of the laser source 110, so that heat in the light emitting process of the laser source 110 can be absorbed and led out, the laser source 110 can continuously and stably emit the laser beams, and burning out of the laser source 110 due to overheat temperature is avoided.

It can be understood that the laser beam emitted from the laser source 110 is projected to the collimating lens 120 along the first direction, and the heat dissipation element 170 is disposed on one side of the second direction of the laser source 110, so that the normal operation of the laser source 110 is not affected, the contact area between the heat dissipation element 170 and the laser source 110 can be increased, and the heat dissipation effect is improved.

The specific materials and structures of the heat dissipation element 170 are not limited in this embodiment, and those skilled in the art may set the specific materials and structures according to practical situations.

In addition, the specific structure and number of the laser sources 110 are not limited in this embodiment, and may be one laser or multiple lasers, which can be set by a person skilled in the art according to the usage scenario of the optical bench 100, for example, when the optical bench 100 needs a laser beam with higher brightness, multiple lasers may be set to emit the laser beam together.

In order to further verify the beneficial effects of the embodiments of the present application, the output frequency spectrograms of the optical engine in the prior art and the optical engine of the present application are compared, where fig. 9 is an output frequency spectrogram of the optical engine in the prior art, it can be seen from fig. 9 that most of the energy of the output image is concentrated in the central area, so as to illustrate that the high frequency information in the image is less, that is, the detail information is less, and this is a typical feature of the grid phenomenon, so as to illustrate that the grid phenomenon of the optical engine in the prior art is more serious. Fig. 10 is an output frequency spectrum of the optical engine according to the embodiment of the present application, compared with fig. 9, the energy of fig. 10 is more dispersed and covers a wider area, so that the high-frequency information in the image is less, and the grid phenomenon is slight.

In another aspect, as shown in fig. 8, the AR device includes the optical engine 100 and the optical waveguide 210 disposed at the light emitting side of the optical engine 100, and the image beam emitted from the optical engine 100 is projected to the coupling region 211 of the optical waveguide 210, and the distance between the first prism 130 of the optical engine 100 and the coupling region 211 is less than or equal to 5mm.

The AR device provided in this embodiment of the present application includes the same structure and beneficial effects as those of the optical engine 100 in the foregoing embodiment, and the structure and beneficial effects of the optical engine 100 have been described in detail in the foregoing embodiment, which is not repeated herein.

In another aspect, in the embodiment of the present application, the distance between the first prism 130 of the optical engine 100 and the coupling-in region 211 of the coupling-in region 211 is set to be less than or equal to 5mm, so that the distance between the outgoing light of the optical engine 100 and the coupling-in region 211 is closer. The larger the distance traveled between the different beams, the larger the gap between the different beams at the end point, the more pronounced the grating phenomenon, according to when the different beams have an angle to each other.

The optical waveguide 210 includes a coupling-in region 211 and a coupling-out region 212, and the optical bench 100 emits a laser beam toward the coupling-in region 211 of the optical waveguide 210, and is coupled into the optical waveguide 210 through the coupling-in region 211, propagates to the coupling-out region 212 through total reflection in the optical waveguide 210, and is finally coupled out from the coupling-out region 212. According to the embodiment of the application, the distance between the first prism 130 and the coupling-in area 211 is set to be less than or equal to 5mm, so that the distance of light beam propagation is relatively short, and therefore, the smaller the gap between different light beams at the coupling-in area 211 is, the weaker the grid phenomenon is, and therefore the quality of an output image of the AR device is improved, and the user experience is further improved.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (9)

1. The utility model provides a ray apparatus, its characterized in that includes laser source, collimating lens and the first prism that set gradually along first direction, the both sides face of first prism along first direction are refracting surface and polarization plane respectively, refracting surface with the polarization plane is connected and has first preset contained angle, the one side of first prism along the second direction has set gradually 1/4 wave plate and scanning galvanometer, the light beam that the laser source was outgoing is through the collimating lens is after the incidence refracting surface, the refracting surface is after the light beam carries out refraction extension incident the polarization plane, the first polarization state light beam in the polarization plane reflection light beam, first polarization state light beam is sees through 1/4 wave plate and is passed through again after the reflection of scanning galvanometer the second polarization state light beam is passed through the polarization plane back emergence.

2. The optical engine according to claim 1, wherein a surface of the first prism adjacent to the 1/4 wave plate is a transmission surface, the transmission surface includes a reflective portion and a transmissive portion connected to each other, the reflective portion is configured to reflect the light beam refracted by the refractive surface to the polarizing surface, and the transmissive portion is configured to transmit the light beam of the first polarization state exiting through the polarizing surface.

3. The light engine of claim 2, wherein the transparent side and the refractive side have a second predetermined angle, the second predetermined angle being between 20 ° and 60 °.

4. The light engine of claim 2, wherein the reflective portion is further provided with a reflective member.

5. The light engine of claim 1, further comprising a second prism disposed along a first direction on a side of the first prism remote from the collimating lens, the second prism being disposed in registry with the first prism and the 1/4 wave plate.

6. The light engine of claim 5, wherein a maximum length of the first prism in the first direction is between 4.5 mm and 5.5mm and a minimum length of the second prism in the first direction is between 0.25mm and 0.35 mm.

7. A light engine according to claim 3, characterized in that the width of the light beam before the refractive surface is D, and the width of the light beam after refractive expansion by the refractive surface is D, D and D satisfying the following relation:

wherein θ is a second preset included angle, and n is the refractive index of the first prism.

8. The optical bench of claim 1 wherein a side of the laser source in the second direction is further provided with a heat sink for dissipating heat from the laser source.

9. An AR device, comprising the optical engine of any one of claims 1-8 and an optical waveguide disposed on an light emitting side of the optical engine, wherein an image beam emitted from the optical engine is projected to a coupling-in area of the optical waveguide, and a distance between a first prism of the optical engine and the coupling-in area is less than or equal to 5mm.