CN117452549A - Symmetrical reflective two-dimensional optical waveguide device - Google Patents

Symmetrical reflective two-dimensional optical waveguide device Download PDF

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Publication number
CN117452549A
CN117452549A CN202310819647.6A CN202310819647A CN117452549A CN 117452549 A CN117452549 A CN 117452549A CN 202310819647 A CN202310819647 A CN 202310819647A CN 117452549 A CN117452549 A CN 117452549A
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CN
China
Prior art keywords
reflecting unit
symmetrical
mirror surface
reflective
longitudinal
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CN202310819647.6A
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Chinese (zh)
Inventor
鱼婧
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Guangzhou Future Fish Optical Technology Co ltd
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Guangzhou Future Fish Optical Technology Co ltd
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Priority to CN202310819647.6A priority Critical patent/CN117452549A/en
Publication of CN117452549A publication Critical patent/CN117452549A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The invention discloses a symmetrical reflective two-dimensional optical waveguide device, and belongs to the technical field of optical display. The device comprises a carrier, a transverse symmetrical reflecting unit and a longitudinal reflecting unit, wherein the transverse symmetrical reflecting unit expands one-dimensional light beams in the x-axis direction, the longitudinal reflecting unit expands two-dimensional light beams in the y-axis direction, and good emergent light beams are obtained after two times of light beam expansion. The invention has the advantages of short light beam propagation path, small light efficiency loss, high light energy utilization rate, good imaging quality, simple structure, small volume and low manufacturing cost.

Description

Symmetrical reflective two-dimensional optical waveguide device
Technical Field
The invention belongs to the technical field of optical display, and particularly relates to a symmetrical reflective two-dimensional optical waveguide device.
Background
As is well known, augmented reality (AR, augmented Reality) technology is a technology that merges virtual information with the real world. However, how to improve the viewing angle, light efficiency, and reduce the volume of the near-eye display device is a hot problem in the research field. In AR glasses, the optical module is mainly divided into two parts, the first part is a micro display module, including a micro display (such as LCD screen, LCOS/DLP display panel, ul led/uOLED, etc. other micro projection); the second part is an eye-entering waveguide, including a prism waveguide (the prism mode is Epson, deluxe, a main company), an array waveguide (a light splitting device glued by a plurality of grating sheets, the main manufacturer has Shanghai line, long line, photoelectric and the like), a diffraction waveguide (the nano-scale micro-fringes are transferred on silicon-based glass by a nano-imprinting method and light propagation is carried out by a diffraction mode), and other waveguide schemes, but most of the waveguide schemes are thicker and have low light efficiency.
The patent with application number CN2019215910031 provides a coaxial near-to-eye display system based on free-form surface reflection, but the thickness of the system is thicker, and the light efficiency of the system is 50% of the total light efficiency loss due to the existence of the light splitting surface 201; meanwhile, the overall light efficiency is lower than 50% because of the coating film of the partially-reversed partially-transparent surface 301. In an array waveguide near-to-eye display device in patent CN202011175559X, a one-dimensional waveguide is arranged at the right side of an optical machine to expand transverse light, but the imaging quality is poor, the light energy utilization rate is low, and the light efficiency is low. Patent CN202110891614 provides a pupil expander and AR device, which combine two one-dimensional optical waveguides to form a two-dimensional optical waveguide, and although it improves the light energy utilization, the two-dimensional optical waveguide has the advantages of complex process, large volume, high cost and low yield.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a symmetrical reflective two-dimensional optical waveguide device, which reduces light efficiency loss through the beam expansion of a transverse symmetrical reflecting unit and a longitudinal reflecting unit, and has high light energy utilization rate and good imaging quality.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a symmetrical reflective two-dimensional optical waveguide device comprises a carrier, a transverse symmetrical reflecting unit and a longitudinal reflecting unit; the transverse symmetrical reflecting unit is positioned at the top end of the inner part of the carrier; the longitudinal reflecting unit is positioned in the carrier and positioned at the left lower part, the right lower part or the right lower part of the transverse symmetrical reflecting unit;
the transverse symmetrical reflecting unit has an included angle theta with the z-axis direction, and the value of theta is-20 ° ～20 ° The method comprises the steps of carrying out a first treatment on the surface of the The transverse symmetrical reflecting unit consists of two symmetrical reflecting arrays, and each reflecting array consists of a plurality of identical reflecting sheets with the inclination angle of gamma;
the longitudinal reflecting unit consists of a plurality of strip prisms with an inclination angle omega;
when light enters from the uppermost end of the carrier, one-dimensional beam expansion is performed in the x-axis direction through the transverse symmetrical reflecting unit, the beam in the x-axis direction is widened after exiting and enters the longitudinal reflecting unit, and the longitudinal reflecting unit performs two-dimensional beam expansion in the y-axis direction to form a beam exiting parallel to the z-axis.
As the preferable technical scheme, the number of the reflecting sheets at two sides of the symmetrical reflecting array is M more than or equal to 3 sheets respectively, and the inclination angle is 0 degrees < gamma degrees less than or equal to 80 degrees.
As a preferable embodiment, the reflection array on one side is denoted as SH1, and the reflection array on the other side is denoted as SH2; the SH1 and SH2 are symmetrical in structure and symmetrical in coating condition; the reflector plate coating in SH1 and SH2 is a partial reflection coating;
the reflector closest to the symmetry axis in SH1 and SH2 are respectively SH11 and SH21, the reflector closest to the symmetry axis is respectively SH12 and SH22, and the reflector farthest from the symmetry axis is SH1M, SH M;
the transmittance of the coating films of SH11 and SH21 is 1/M, and the reflectivity is 1-1/M;
the transmittance of the coating films of SH12 and SH22 is 1/(M-1), and the reflectivity is 1-1/(M-1);
...；
the transmittance of the coating films of SH1M and SH2M is 0 and the reflectance is 1.
As a preferable technical scheme, the strip prism comprises four mirror surfaces S1, S2, S3 and S4, wherein S1 and S3 are parallel opposite surfaces, and S2 and S4 are parallel opposite surfaces; the S4 mirror surface of each strip prism is in glued connection with the S2 mirror surface of the next strip prism; the inclination angle omega is an included angle between the S1 mirror surface and the S4 mirror surface, and the inclination angle omega is 20-80 degrees;
the S1, S2 and S3 mirror surfaces of the strip prism are high-transmission coating films; s4, the mirror surface is a partial reflection coating.
As a preferable technical scheme, the transverse symmetrical reflecting unit is connected with the longitudinal reflecting unit through a total reflection channel; the surface coating of the total reflection channel is a high-transmittance film, and the channel is air, so that light total reflection propagation is realized;
the strip prism comprises four mirror surfaces S1, S2, S3 and S4, wherein S1 and S3 are parallel opposite surfaces, and S2 and S4 are parallel opposite surfaces; the S4 mirror surface of each strip prism is in glued connection with the S2 mirror surface of the next strip prism; the inclination angle omega is an included angle between the S1 mirror surface and the S4 mirror surface, and the inclination angle omega is 20-80 degrees;
the S1 mirror surface and the S3 mirror surface are total reflection coating films, the S2 mirror surface is a high-transmission coating film, and the S4 mirror surface is a partial reflection coating film.
As a preferable technical scheme, the inclination angle omega is an included angle between the S3 mirror surface and the S4 mirror surface, the inclination angle omega is 20-80 degrees, and the light beam after the two-dimensional light beam expansion of the longitudinal reflecting unit is emitted along the negative direction of the z axis.
As a preferable technical scheme, when the longitudinal reflecting unit is positioned at the left lower part or the right lower part of the transverse symmetrical reflecting unit, the partial reflecting coating of the S4 mirror surface is a total reflecting coating or a coating with the same reflectivity;
when the longitudinal reflecting unit is located under the transverse symmetrical reflecting unit or the transverse symmetrical reflecting unit is connected with the longitudinal reflecting unit through a total reflection channel, the reflectivity of the partial reflection coating of the S4 mirror surface is gradually increased from top to bottom, specifically:
setting the number N of the strip prisms, wherein N is more than or equal to 3, and the reflectivity of the partial reflection coating of the mirror surface of each strip prism S4 is R, and then the reflectivity of the mirror surface reflection coating of the first strip prism S4 is R=1/N;
the reflectivity of the mirror reflection coating of the second strip prism S4 is R=1/(N-1);
...；
the reflectivity of the specular reflection coating of the nth long prism S4 is r=1.
As a preferable technical scheme, the materials of the carrier, the transverse symmetrical reflecting unit and the longitudinal reflecting unit are the same or different.
As a preferable technical scheme, the carrier is a transparent resin material.
As a preferable technical scheme, the transverse symmetrical reflecting unit and the longitudinal reflecting unit are independent units;
the transverse symmetrical reflecting unit and the longitudinal reflecting unit form an integral device with the carrier in a gluing mode, or after the transverse symmetrical reflecting unit and the longitudinal reflecting unit are fixed in position in the carrier, the integral device is formed in an integral glue filling mode.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the transverse symmetrical reflecting unit is easy to process, the placing condition is loose, and the angles and the number of the reflecting sheets are easy to realize.
2. Compared with other two-dimensional array optical waveguides, the transverse symmetrical reflecting unit has the advantages of shorter optical path, small light efficiency loss and high light energy utilization rate.
3. The transverse symmetrical reflecting unit and the longitudinal reflecting unit are independent units, so that the device has various layouts, small volume and low manufacturing cost; through twice beam expansion, the imaging quality is good, and the imaging device can be used in multiple scenes.
Drawings
FIG. 1 is a schematic diagram of a symmetrical reflective two-dimensional optical waveguide device in accordance with an embodiment of the present invention.
Fig. 2 is a schematic view of the longitudinal reflecting unit positioned directly below the transverse symmetrical reflecting unit in the embodiment of the present invention.
FIG. 3 is a schematic diagram illustrating the angles between the transverse symmetric reflective units and the z-axis in an embodiment of the invention.
In fig. 4, (a) is a schematic structural view of the laterally symmetric reflecting unit; (b) is a schematic view of the reflector plate having an inclination angle of 60 degrees; (c) is a schematic view of the reflector with a 30 ° tilt angle.
FIG. 5 is a schematic diagram illustrating an arrangement of reflective sheets in a symmetric reflective array according to an embodiment of the invention.
Fig. 6 is a schematic structural diagram of a longitudinal reflecting unit according to an embodiment of the present invention.
Fig. 7 is a schematic view of a long prism.
Fig. 8 is a schematic diagram of a connection between a transverse symmetric reflection unit and a longitudinal reflection unit through a total reflection channel in an embodiment of the present invention.
Fig. 9 is a schematic diagram of a beam emitted from a two-dimensional beam spread of a longitudinal reflecting unit along a negative z-axis direction according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the invention are not limited thereto.
Referring to fig. 1, 2 and 3, the present embodiment provides a symmetrical reflective two-dimensional optical waveguide device, which includes a carrier 1, a transverse symmetrical reflective unit 2 and a longitudinal reflective unit 3; the transverse symmetrical reflecting unit 2 is positioned at the top end of the interior of the carrier 1; the longitudinal reflecting unit 3 is positioned inside the carrier 1 and below the transverse symmetrical reflecting unit 2; it should be understood here that the longitudinal reflecting unit may be located right below the lateral symmetrical reflecting unit as shown in fig. 1, may be located right below the lateral symmetrical reflecting unit as shown in fig. 2, and may be located left below the lateral symmetrical reflecting unit.
The transverse symmetrical reflecting unit forms an included angle theta with the z-axis direction, and the value of theta is-20 ° ～20 ° As shown in fig. 3, the included angle θ is a positive angle, and represents an included angle with the positive direction of the z-axis; if the included angle theta is a negative angle, the included angle theta is an included angle with the negative direction of the z axis; the transverse symmetrical reflecting unit consists of two symmetrical reflecting arrays, and each reflecting array consists of a plurality of identical reflecting sheets with the inclination angle of gamma;
the longitudinal reflecting unit consists of a plurality of strip prisms with an inclination angle omega;
when light enters from the uppermost end of the carrier 1, the light firstly passes through the transverse symmetrical reflecting unit 2 to perform one-dimensional beam expansion in the x-axis direction, the light beam in the x-axis direction after exiting is widened and enters the longitudinal reflecting unit 3, and the longitudinal reflecting unit 3 performs two-dimensional beam expansion in the y-axis direction to form the light beam exiting parallel to the z-axis.
Further, the number M of the reflecting sheets in the single-side reflecting array of the transverse symmetrical reflecting unit is more than or equal to 3, and the inclination angle is 0 degrees and less than or equal to 80 degrees. As shown in fig. 4 (a), the reflective arrays of the transverse symmetric reflective units are symmetrically distributed at the middle position, and the number of reflective sheets at each side is 3 by adopting a 3+3 array mode. As shown in fig. 4 (b), a schematic view of the laterally symmetric reflecting unit when the inclination angle γ is 80 °, and fig. 4 (c) is a schematic view of the laterally symmetric reflecting unit when the inclination angle γ is 30 °.
Further, as shown in fig. 5, the reflection array on one side is denoted as SH1, and the reflection array on the other side is denoted as SH2; wherein, SH1 and SH2 are symmetrical in structure and symmetrical in coating condition; the reflector coating in SH1 and SH2 is a partial reflection coating;
the reflector closest to the symmetry axis in SH1 and SH2 are respectively SH11 and SH21, the reflector closest to the symmetry axis is respectively SH12 and SH22, and the reflector farthest from the symmetry axis is SH1M, SH M;
the transmittance of the coating films of SH11 and SH21 is 1/M, and the reflectivity is 1-1/M;
the transmittance of the coating films of SH12 and SH22 is 1/(M-1), and the reflectivity is 1-1/(M-1);
...；
the transmittance of the coating films of SH1M and SH2M is 0, and the reflectance is 1.
Further, as shown in fig. 6 and 7, the longitudinal reflecting unit 3 is composed of a plurality of elongated prisms, and the elongated prisms include four mirrors S1, S2, S3 and S4, wherein S1 and S3 are parallel opposite faces and S2 and S4 are parallel opposite faces; the S4 mirror surface of each strip prism is in glued connection with the S2 mirror surface of the next strip prism; the inclination angle omega is the included angle between the S1 mirror surface and the S4 mirror surface, and the inclination angle omega is 20-80 degrees; the S1, S2 and S3 mirror surfaces of the strip prism are high-transmission coating films; s4, the mirror surface is a partial reflection coating.
In another embodiment, as shown in fig. 8, the lateral symmetric reflection unit 2 and the longitudinal reflection unit 3 are connected by a total reflection channel; the surface coating of the total reflection channel is a high-transmittance film, air is arranged in the channel, and light rays can be transmitted in a total reflection way by utilizing the refractive index difference between the total reflection channel and the air; the light beam emitted by the transverse symmetrical reflecting unit is transmitted to the longitudinal reflecting unit by total reflection in the total reflection channel, and the light beam emitted parallel to the z axis is formed after two-dimensional light beam expansion.
The strip prism in the longitudinal reflecting unit also comprises four mirror surfaces S1, S2, S3 and S4, wherein S1 and S3 are parallel opposite surfaces, and S2 and S4 are parallel opposite surfaces; the S4 mirror surface of each strip prism is in glued connection with the S2 mirror surface of the next strip prism; the inclination angle omega is the included angle between the S1 mirror surface and the S4 mirror surface, and the inclination angle omega is 20-80 degrees; in particular, the S1 and S3 mirrors are total reflection coating, the S2 mirror is high transmission coating, and the S4 mirror is partial reflection coating.
Furthermore, in the above embodiment, the two-dimensional beam expansion performed by the longitudinal reflecting unit is parallel to the positive direction of the z-axis, but may also exit along the negative direction of the z-axis. As shown in fig. 9, the inclination angle ω of the elongated prism in the longitudinal reflecting unit is an included angle between the S3 mirror surface and the S4 mirror surface, and the inclination angle ω is 20 ° to 80 °, so as to realize the emission of the beam of the two-dimensional beam spread of the longitudinal reflecting unit along the negative z-axis direction.
Further, because the S4 mirror surface is a partial reflection coating, in order to ensure the quality of the reflected light beam, when the longitudinal reflection unit is positioned at the left lower part or the right lower part of the transverse symmetrical reflection unit, the partial reflection coating of the S4 mirror surface is a total reflection coating or a coating with the same reflectivity;
when the longitudinal reflecting unit is positioned under the transverse symmetrical reflecting unit or the transverse symmetrical reflecting unit is connected with the longitudinal reflecting unit through the total reflection channel, the reflectivity of the partial reflection coating film of the S4 mirror surface is gradually increased from top to bottom, and specifically:
setting the number N of the strip prisms, wherein N is more than or equal to 3, and the reflectivity of the partial reflection coating of the mirror surface of each strip prism S4 is R, and then the reflectivity of the mirror surface reflection coating of the first strip prism S4 is R=1/N;
the reflectivity of the mirror reflection coating of the second strip prism S4 is R=1/(N-1);
...；
the reflectivity of the specular reflection coating of the (N-1) -th strip prism S4 is R=1/2;
the reflectivity of the specular reflection coating of the nth long prism S4 is r=1.
Further, in this embodiment, the materials of the carrier 1, the transverse symmetric reflecting unit 2 and the longitudinal reflecting unit 3 are the same or different.
Specifically, the carrier 1 is made of a transparent resin material, the transverse symmetrical reflecting unit 2 and the longitudinal reflecting unit 3 are arranged inside the transparent resin material, and the optical beam propagates inside the transparent resin material and is not limited by the surface morphology of the carrier.
Furthermore, in the invention, the transverse symmetrical reflecting unit and the longitudinal reflecting unit are independent units; the monolithic device may be constructed by:
firstly, the transverse symmetrical reflecting unit and the longitudinal reflecting unit form an integral device with the carrier in a gluing mode; and secondly, after the transverse symmetrical reflecting units and the longitudinal reflecting units are fixed in positions in the carrier, forming an integral device in an integral glue filling mode.
It should also be noted that in this specification, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A symmetrical reflective two-dimensional optical waveguide device is characterized by comprising a carrier, a transverse symmetrical reflecting unit and a longitudinal reflecting unit; the transverse symmetrical reflecting unit is positioned at the top end of the inner part of the carrier; the longitudinal reflecting unit is positioned in the carrier and positioned at the left lower part, the right lower part or the right lower part of the transverse symmetrical reflecting unit;
the transverse symmetrical reflecting unit has an included angle theta with the z-axis direction, and the value of theta is-20 ° ～20 ° The method comprises the steps of carrying out a first treatment on the surface of the The transverse symmetrical reflecting unit consists of two symmetrical reflecting arrays, and each reflecting array consists of a plurality of identical reflecting sheets with the inclination angle of gamma;
the longitudinal reflecting unit consists of a plurality of strip prisms with an inclination angle omega;
when light enters from the uppermost end of the carrier, one-dimensional beam expansion is performed in the x-axis direction through the transverse symmetrical reflecting unit, the beam in the x-axis direction is widened after exiting and enters the longitudinal reflecting unit, and the longitudinal reflecting unit performs two-dimensional beam expansion in the y-axis direction to form a beam exiting parallel to the z-axis.
2. The symmetrical reflective two-dimensional optical waveguide device according to claim 1, wherein the number of reflective sheets on both sides of the symmetrical reflective array is m.gtoreq.3 sheets, and the tilt angle is 0 ° < γ.ltoreq.80 °.
3. A symmetrical reflective two-dimensional optical waveguide device according to claim 1, wherein the reflective array on one side is denoted SH1 and the reflective array on the other side is denoted SH2; the SH1 and SH2 are symmetrical in structure and symmetrical in coating condition; the reflector plate coating in SH1 and SH2 is a partial reflection coating;
the reflector closest to the symmetry axis in SH1 and SH2 are respectively SH11 and SH21, the reflector closest to the symmetry axis is respectively SH12 and SH22, and the reflector farthest from the symmetry axis is SH1M, SH M;
the transmittance of the coating films of SH11 and SH21 is 1/M, and the reflectivity is 1-1/M;
the transmittance of the coating films of SH12 and SH22 is 1/(M-1), and the reflectivity is 1-1/(M-1);
...；
the transmittance of the coating films of SH1M and SH2M is 0 and the reflectance is 1.
4. The symmetrical reflective two-dimensional optical waveguide device of claim 1, wherein the elongated prism comprises four mirrors S1, S2, S3, and S4, wherein S1 and S3 are parallel opposing faces and S2 and S4 are parallel opposing faces; the S4 mirror surface of each strip prism is in glued connection with the S2 mirror surface of the next strip prism; the inclination angle omega is an included angle between the S1 mirror surface and the S4 mirror surface, and the inclination angle omega is 20-80 degrees;
the S1, S2 and S3 mirror surfaces of the strip prism are high-transmission coating films; s4, the mirror surface is a partial reflection coating.
5. The symmetrical reflective two-dimensional optical waveguide device according to claim 1, wherein the transverse symmetrical reflective unit is connected with the longitudinal reflective unit through a total reflection channel; the surface coating of the total reflection channel is a high-transmittance film, and the channel is air, so that light total reflection propagation is realized;
the strip prism comprises four mirror surfaces S1, S2, S3 and S4, wherein S1 and S3 are parallel opposite surfaces, and S2 and S4 are parallel opposite surfaces; the S4 mirror surface of each strip prism is in glued connection with the S2 mirror surface of the next strip prism; the inclination angle omega is an included angle between the S1 mirror surface and the S4 mirror surface, and the inclination angle omega is 20-80 degrees;
the S1 mirror surface and the S3 mirror surface are total reflection coating films, the S2 mirror surface is a high-transmission coating film, and the S4 mirror surface is a partial reflection coating film.
6. The symmetrical reflective two-dimensional optical waveguide device according to claim 4 or 5, wherein the inclination angle ω is an included angle between the S3 mirror surface and the S4 mirror surface, and the inclination angle ω is 20 ° to 80 °, so that the light beam after the two-dimensional light beam expansion of the longitudinal reflecting unit is emitted along the negative z-axis direction.
7. The symmetrical reflective two-dimensional optical waveguide device according to claim 6, wherein when the longitudinal reflecting unit is positioned at the left lower side or the right lower side of the transverse symmetrical reflecting unit, the partial reflection coating of the S4 mirror surface is a total reflection coating or a coating with the same reflectivity;
when the longitudinal reflecting unit is located under the transverse symmetrical reflecting unit or the transverse symmetrical reflecting unit is connected with the longitudinal reflecting unit through a total reflection channel, the reflectivity of the partial reflection coating of the S4 mirror surface is gradually increased from top to bottom, specifically:
setting the number N of the strip prisms, wherein N is more than or equal to 3, and the reflectivity of the partial reflection coating of the mirror surface of each strip prism S4 is R, and then the reflectivity of the mirror surface reflection coating of the first strip prism S4 is R=1/N;
the reflectivity of the mirror reflection coating of the second strip prism S4 is R=1/(N-1);
...；
the reflectivity of the specular reflection coating of the nth long prism S4 is r=1.
8. The symmetrical reflective two-dimensional optical waveguide device according to claim 1, wherein the material of the carrier, the transverse symmetrical reflective unit and the longitudinal reflective unit is the same or different.
9. The symmetrical, reflective, two-dimensional optical waveguide device of claim 8, wherein said carrier is a transparent resin material.
10. The symmetrical reflective two-dimensional optical waveguide device of claim 1, wherein the laterally symmetrical reflective unit and the longitudinally reflective unit are separate units;
the transverse symmetrical reflecting unit and the longitudinal reflecting unit form an integral device with the carrier in a gluing mode, or after the transverse symmetrical reflecting unit and the longitudinal reflecting unit are fixed in position in the carrier, the integral device is formed in an integral glue filling mode.
CN202310819647.6A 2023-07-05 2023-07-05 Symmetrical reflective two-dimensional optical waveguide device Pending CN117452549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310819647.6A CN117452549A (en) 2023-07-05 2023-07-05 Symmetrical reflective two-dimensional optical waveguide device

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Application Number Priority Date Filing Date Title
CN202310819647.6A CN117452549A (en) 2023-07-05 2023-07-05 Symmetrical reflective two-dimensional optical waveguide device

Publications (1)

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CN117452549A true CN117452549A (en) 2024-01-26

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