Holographic optical waveguide, sighting telescope and AR equipment

Abstract

The utility model discloses a holographic optical waveguide, a sighting telescope and AR equipment, and relates to the technical field of optics. The optical path effect of the reflective sighting telescope is achieved in the mode that the propagation path of light is changed through the holographic waveguide sheet, meanwhile, the problem that the reflective sighting telescope is large in size and weight or poor in target display effect is solved, and the reflective sighting telescope has the advantages of being small in size, light in weight, good in display effect and the like. The size of the coupled image area entering the holographic waveguide sheet is consistent with the size of the coupled image area from the holographic waveguide sheet, so that the holographic waveguide sheet is a pupil-expanding-free holographic waveguide sheet, the coupled image does not need to be copied in the holographic optical waveguide, namely, the size of the coupled image area is consistent with the size of the coupled image area; and meanwhile, the coupling-in area and the coupling-out area are the same in size and are both larger than the preset size, so that the pupil-expansion-free holographic optical waveguide has a large exit pupil effect, the quality of the coupled-out image is high, the light effect loss is small, and the observation experience is good.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, in particular to a holographic optical waveguide, a sight and an AR device. Background Art

[0002] Reflex sight systems are widely used outdoors, etc. Reflex sights are mainly divided into red dot sights and holographic sights.

[0003] Red dot sights create images by reflecting a point light source through a reflector to infinity. They are characterized by ease of use, low price, and small size. However, their disadvantages are a relatively small field of view. When the human eye moves to the edge of the sight, chromatic aberration and aiming errors occur, affecting aiming accuracy. Holographic sights, on the other hand, use collimated laser light incident on a holographic photograph to restore the image of an infinitely distant target. Their advantages include no eye distance requirement, high stability, and no chromatic aberration. Their disadvantages are high cost, complex structure, and large size. Clearly, both red dot sights and holographic sights have certain flaws that affect their use. Furthermore, optical waveguides with pupil expansion typically replicate the outgoing light to expand the field of view, resulting in lower energy in the beam reaching the eye, impacting the visual experience.

[0004] It can be seen that providing a small-sized sight with good display effect is a technical problem that people in this field need to solve urgently. Utility Model Content

[0005] The purpose of the utility model is to provide a holographic optical waveguide, a sight and an AR device, so as to solve the technical problems of the existing reflective sights, such as large size and poor display effect.

[0006] To solve the above technical problems, the present invention provides a holographic optical waveguide, comprising a holographic waveguide plate, wherein an incoupling region and an outcoupling region are respectively provided at both ends of the holographic waveguide plate; the sizes of the incoupling region and the outcoupling region are both larger than a preset size; and the sizes of the incoupling region and the outcoupling region are the same, or the size difference between the incoupling region and the outcoupling region is less than a preset threshold;

[0007] The coupling-in region is used to receive a first parallel light beam and change the transmission direction of the first parallel light beam before transmitting it through total reflection in the holographic waveguide. The coupling-out region is used to receive the light beam after the total reflection transmission and change the transmission direction of the light beam before transmitting it through the holographic waveguide to form a second parallel light beam.

[0008] The area size of the coupled-in image incident on the holographic waveguide plate is consistent with the area size of the coupled-out image from the holographic waveguide plate.

[0009] Exemplarily, the sizes of the coupling-in region and the coupling-out region are both larger than a preset size, specifically: the sum of the area of the coupling-in region and the area of the coupling-out region is larger than 70% of the area of the holographic waveguide plate.

[0010] Exemplarily, a hologram is provided on the light-emitting side of the outcoupling region, and the hologram is located on the transmission path of the second parallel light beam.

[0011] Exemplarily, the hologram is attached to the holographic waveguide sheet by means of embossing, etching, masking or exposure and development.

[0012] In order to solve the above technical problems, the utility model provides a sight, comprising: a light source, a collimating element and the above holographic optical waveguide;

[0013] The light source is arranged on one side of the coupling-in region of the holographic optical waveguide and is used to emit a light beam;

[0014] The collimating element is provided between the light source and the holographic optical waveguide, and is used for collimating the light beam emitted by the light source to form the first parallel light beam and transmit the first parallel light beam to the holographic optical waveguide;

[0015] The holographic optical waveguide is used to change the transmission direction of the first parallel light beam and then perform total reflection transmission, thereby forming the second parallel light beam to be emitted to the human eye.

[0016] Exemplarily, when the light source includes a laser light source, the wavelength of the laser light source is the same as the wavelength of the reference light used in preparing the hologram.

[0017] Exemplarily, the light source is a single light source, and the outcoupling region is further arranged on the white light path. The white light and the single light source are diffracted by the outcoupling region and then emitted to the human eye.

[0018] Exemplarily, the outcoupling region is also arranged on the white light path, and the transmission direction of the second parallel light beam is consistent with the transmission direction of the white light after entering the sight. After the white light is diffracted by the outcoupling region, it is emitted to the human eye together with the second parallel light beam formed based on the light source.

[0019] Exemplarily, the outcoupling area and the hologram are also arranged on the white light path, and the transmission direction of the second parallel light beam is consistent with the transmission direction of the white light after entering the sight. After the white light is diffracted by the outcoupling area, it is transmitted to the hologram together with the second parallel light beam formed based on the light source, and finally emitted to the human eye.

[0020] Exemplarily, the light source is a single light source; or, the light source includes a first light source and a second light source, and a light combining element is provided on the optical path between the light source and the collimating element, and the light beam emitted by the first light source and the light beam emitted by the second light source are combined by the light combining element and then transmitted to the collimating element.

[0021] Exemplarily, the first light source and the second light source are light sources of the same type or light sources of different types; wherein the light source types include at least a point light source type, an image source type, and a laser light source type.

[0022] Exemplarily, the light combining element is a semi-transparent, semi-reflective mirror; the first light source and the second light source are respectively located on both sides of the semi-transparent, semi-reflective mirror, and the semi-transparent, semi-reflective mirror is placed at 45° relative to the center line of the light beam emitted by the first light source, and the semi-transparent, semi-reflective mirror is placed at 45° relative to the center line of the light beam emitted by the second light source.

[0023] In order to solve the above technical problems, the present invention also provides an AR device, including the above-mentioned holographic optical waveguide or sight.

[0024] The holographic optical waveguide provided by the utility model includes a holographic waveguide plate, and a coupling-in region and a coupling-out region are respectively provided at both ends of the holographic waveguide plate. The coupling-in region is used to receive a first parallel light beam and change the transmission direction of the first parallel light beam to be transmitted by total reflection in the holographic waveguide plate; the coupling-out region is used to receive the light beam after the total reflection transmission and change the transmission direction of the light beam to form a second parallel light beam for output. By using a holographic waveguide to change the propagation path of light, the optical path effect of a reflective sight is achieved, while avoiding the problems of large size and weight or poor target display effect of reflective sights, and having the advantages of small size, light weight and good display effect. In addition, the area of the coupled image incident on the holographic waveguide is consistent with the area of the coupled image from the holographic waveguide, making the holographic waveguide a non-pupil dilation holographic waveguide. The coupled image does not need to be replicated in the holographic optical waveguide, that is, the area of the coupled image is consistent with the area of the coupled image, reducing the light efficiency loss caused by image replication. At the same time, the dimensions of the coupled area and the coupled area are the same and both larger than the preset dimensions, so that the non-pupil dilation holographic optical waveguide also has a large exit pupil effect, high-quality coupled images, low light efficiency loss, and a good observation experience. In addition, the light beam is transmitted by total reflection in the holographic waveguide, avoiding transmission, further reducing light loss, increasing the amount of light entering the human eye, and greatly improving the user experience.

[0025] In addition, the present invention also provides a sight, including the above-mentioned holographic optical waveguide, which has the same or corresponding technical features as the above-mentioned holographic optical waveguide and has the same effects as above.

[0026] In addition, the present invention also provides an AR device, including the above-mentioned holographic optical waveguide or sight, which has the same or corresponding technical features as the above-mentioned holographic optical waveguide or sight, and has the same effect as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of a holographic optical waveguide provided in an embodiment of the present utility model;

[0029] Figure 2 A schematic diagram of a holographic waveguide provided in an embodiment of the present utility model;

[0030] Figure 3 A schematic diagram of a sighting scope provided in a first embodiment of the present utility model;

[0031] Figure 4 A schematic diagram of a sighting scope provided in a second embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of a sighting scope provided in the third embodiment of the present utility model.

[0033] The reference numerals are as follows:

[0034] 1-first light source; 2-second light source; 3-light combining element; 4-collimation element; 5-holographic waveguide; 6-human eye; 7-holographic photograph. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0036] The core of the utility model is to provide a holographic optical waveguide, a sight and an AR device to solve the technical problems of existing reflective sights such as large size and poor display effect.

[0037] In order to enable those skilled in the art to better understand the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods. Figure 1 A schematic diagram of a holographic optical waveguide provided by an embodiment of the present utility model is shown as follows: Figure 1 As shown, the holographic waveguide plate 5 includes a coupling-in region and a coupling-out region at both ends of the holographic waveguide plate 5. The sizes of the coupling-in region and the coupling-out region are both larger than a preset size. The sizes of the coupling-in region and the coupling-out region are the same, or the size difference between the coupling-in region and the coupling-out region is smaller than a preset threshold.

[0038] The coupling-in region is used to receive the first parallel light beam and change the transmission direction of the first parallel light beam to undergo total reflection transmission in the holographic waveguide plate 5; the coupling-out region is used to receive the light beam after total reflection transmission and change the transmission direction of the light beam to form a second parallel light beam for emission;

[0039] The area size of the coupled-in image incident on the holographic waveguide plate 5 is consistent with the area size of the coupled-out image from the holographic waveguide plate 5 .

[0040] In order to ensure the amount of light received by the human eye 6 after passing through the waveguide plate, in the holographic optical waveguide provided by the present invention, the area of the coupled image incident to the holographic waveguide plate 5 is consistent with the area of the coupled image from the holographic waveguide plate 5, that is, it has the function of not dilating the pupil. Figure 2 This is a schematic diagram of a holographic waveguide provided by an embodiment of the present utility model. Figure 2As shown, a coupling-in region and a coupling-out region are provided in the holographic waveguide plate 5. The holographic gratings in the coupling-in region and the coupling-out region have the advantages of being lightweight and having high diffraction efficiency. According to the grating equation mλ=d(sinα±sinβ), the diffraction angle β is the propagation direction of the light after passing through the grating, where the diffraction wavelength (λ) is a constant. By adjusting the grating order (m), the incident angle (α), and the grating constant (d), the light beam can be modulated, that is, the light beam after passing through the grating can be propagated in a specified direction. There is no limit on the size of the coupling-in region and the coupling-out region; the dimensions of the coupling-in region and the coupling-out region are the same, or the difference in size between the coupling-in region and the coupling-out region is less than a preset threshold. It is worth noting that the preset threshold is a value close to 0. Preferably, the size of the coupling-in region is equal to the size of the coupling-out region. By setting the size of the coupling-in image area incident on the holographic waveguide plate to be consistent with the size of the coupling-out image area emitted from the holographic waveguide plate, that is, the size of the coupling-in image area and the coupling-out image area are equal or similar, the holographic waveguide plate is made into a non-pupil dilation holographic waveguide plate. At the same time, the sizes of the coupling-in region and the coupling-out region are set to be the same, so that the image quality coupled in and out through the non-pupil dilation holographic waveguide plate is high and the light efficiency loss is small. In addition, the sizes of the coupling-in region and the coupling-out region are both set to be larger than the preset size, that is, the sum of the area of the coupling-in region and the area of the coupling-out region is larger than 70% of the area of the holographic waveguide plate, so that the holographic optical waveguide has a large exit pupil effect. It can be seen that the holographic light waveguide provided in this embodiment is a non-pupil dilation holographic light waveguide, and the coupled-in image does not need to be replicated in the holographic light waveguide, that is, the size of the coupled-in image area is consistent with the size of the coupled-out image area, thereby reducing the light efficiency loss caused by image replication. At the same time, the sizes of the coupled-in area and the coupled-out area are the same and both are larger than the preset size, so that the non-pupil dilation holographic light waveguide also has a large exit pupil effect, high-quality coupled-out images, low light efficiency loss, and a good observation experience.

[0041] The coupling-in region is used to receive the first parallel light beam, and change the transmission direction of the first parallel light beam to be transmitted through total reflection in the holographic waveguide plate 5; the coupling-out region is used to receive the light beam after total reflection transmission, and change the transmission direction of the light beam to form a second parallel light beam for emission.

[0042] In practice, a hologram 7 is provided on the light-emitting side of the outcoupling region of the holographic optical waveguide; the hologram 7 is located along the transmission path of the second parallel light beam. The hologram 7 can be placed a distance away from the holographic waveguide plate 5 or attached to the holographic waveguide plate 5 via embossing, etching, masking, or exposure and development. To reduce system size, embossing, etching, masking, or exposure and development can be used.

[0043] The holographic optical waveguide provided by the present invention includes a holographic waveguide plate 5, and a coupling-in region and a coupling-out region are respectively provided at both ends of the holographic waveguide plate 5. The coupling-in region is used to receive a first parallel light beam and change the transmission direction of the first parallel light beam to be transmitted by total reflection in the holographic waveguide plate 5; the coupling-out region is used to receive the light beam after the total reflection transmission and change the transmission direction of the light beam to form a second parallel light beam for output. By using the holographic waveguide plate 5 to change the propagation path of light, the optical path effect of the reflective sight is achieved, while avoiding the problems of large size and weight or poor target display effect of the reflective sight, and has the advantages of small size, light weight and good display effect. The area of the coupled image incident on the holographic waveguide plate 5 is consistent with the area of the coupled image from the holographic waveguide plate 5, and the sizes of the coupled area and the coupled area are both larger than the preset size. The sizes of the coupled area and the coupled area are the same, or the size difference between the coupled area and the coupled area is smaller than the preset threshold, achieving the effect of no pupil expansion and a large exit pupil, reducing light loss and increasing the amount of light entering the human eye. The light beam is transmitted by total reflection in the holographic waveguide plate 5, avoiding transmission, further reducing light loss, increasing the amount of light entering the human eye 6, and greatly improving the user experience.

[0044] A holographic optical waveguide is described above. This embodiment further provides a sight, comprising: a light source, a collimating element 4 and the above-mentioned holographic optical waveguide;

[0045] The light source is provided on one side of the coupling-in region of the holographic waveguide plate 5 and is used to emit a light beam;

[0046] The collimating element 4 is provided between the light source and the holographic waveguide plate 5, and is used to collimate the light beam emitted by the light source to form a first parallel light beam and transmit it to the holographic waveguide plate 5;

[0047] The holographic waveguide plate 5 is used to change the transmission direction of the first parallel light beam and then perform total reflection transmission to form a second parallel light beam to be emitted to the human eye 6.

[0048] There are no restrictions on the light source; it can be a single light source or multiple light sources. Specifically, the light source can be, but is not limited to, a laser light source. It can also be a light-emitting diode (LED) light source, a display light source, a light source with a graticule pattern, or a display light source with a digital image. When the light source is a microdisplay, the microdisplay can carry long-infrared thermal imaging information, medium-wave infrared information, short-wave infrared information, near-infrared night vision imaging information, or other types of electronic imaging information. When multiple light sources are used, there are no restrictions on the number of light sources. For example, the light source includes a first light source 1 and a second light source 2. In this case, the pupil expansion system also includes a light combining element 3; light combining element 3 is located in the optical path between the light source and the collimating element 4. The first light source 1 and the second light source 2 can be of the same type or different types. The light source type includes at least a point light source type and an image source type. Light combining element 3 can be a semi-transparent and semi-reflective mirror. The first light source 1 and the second light source 2 are respectively located on both sides of the semi-transparent and semi-reflective mirror, and the semi-transparent and semi-reflective mirror is placed at 45° relative to the center line of the light beam emitted by the first light source 1, and the semi-transparent and semi-reflective mirror is placed at 45° relative to the center line of the light beam emitted by the second light source 2.

[0049] There is no limitation on the collimating element 4 used, as long as it can convert the light beam emitted by the light source into parallel light. For example, the collimating element 4 used can be a single lens, a combination of lenses or a curved reflector.

[0050] There is no limitation on the position of the holographic waveguide plate 5 relative to the first parallel light beam. The holographic waveguide plate 5 can be placed vertically or tilted relative to the first parallel light beam.

[0051] Taking the light source as multiple light sources (including the first light source 1 and the second light source 2) as an example, the sight provided by the embodiment of the present utility model is described. Figure 3 A schematic diagram of a sighting scope provided in the first embodiment of the present utility model is shown in FIG. Figure 3 As shown, the sight comprises: a light combining element 3, a collimating element 4 and a holographic waveguide plate 5 placed in sequence along the transmission direction of the light beam emitted by the light source; the light source comprises a first light source 1 and a second light source 2; wherein the first light source 1 is an image source;

[0052] The light combining element 3 is used to combine the first light source 1 and the second light source 2;

[0053] The collimating element 4 is used to collimate the light beam after passing through the light combining element 3;

[0054] The coupling-in region in the holographic waveguide plate 5 is used to receive the first parallel light beam collimated by the collimating element 4 and change the transmission direction of the first parallel light so that the light beam after passing through the coupling-in region is transmitted by total internal reflection inside the holographic waveguide plate 5;

[0055] The outcoupling region in the holographic waveguide plate 5 is used to receive the light beam after total reflection transmission, and change the transmission direction of the light beam after total reflection transmission to form a second parallel light, which is then merged into the human eye 6; wherein the outcoupling region is a semi-transparent medium.

[0056] exist Figure 3 In the schematic diagram of the provided sight, the first light source 1 used is an image source, such as a micro display screen, which is used to display images formed by different channels or other information that needs to be displayed; the second light source 2 used is a point light source, which is used to form a red dot target at infinity; the light combining element 3 used is a semi-transparent and semi-reflective mirror, which is at 45° to the main optical axis of the light emitted by the micro display screen and the point light source, and is used to deflect the light emitted by the micro display screen so that it can be merged with the light beam emitted by the point light source. Collimating element 4 receives the light beams from the point light source and the microdisplay, corrects their internal aberrations, and emits them as parallel light into holographic waveguide 5. Holographic waveguide 5 is positioned perpendicular to the centerline of the collimated light beams released by collimating element 4. The incoupling region of holographic waveguide 5 receives the collimated light. The holographic grating in this region redirects the incident collimated light, causing it to be totally reflected into the interior of the waveguide. Upon reaching the outcoupling region, the light is redirected again by the holographic light in the outcoupling region, propagating toward the human eye 6. Because the outcoupling region is a semi-transparent medium, light from the external scene can directly pass through it. The human eye 6 receives the combined light from the red point light source, the microdisplay, and the external scene.

[0057] Figure 3 The holographic waveguide plate 5 is placed perpendicularly relative to the first parallel light beam. Figure 4 This is a schematic diagram of a sighting scope provided by the second embodiment of the present utility model, compared with Figure 3 Schematic diagram of the scope provided and Figure 4 The schematic diagram of the scope provided shows that Figure 3 and Figure 4 The difference is that Figure 4 The holographic waveguide plate 5 in the grating is tilted relative to the first parallel light beam. According to the grating equation, when the holographic waveguide plate 5 is tilted, the energy of the diffracted light within the diffraction angle β is more concentrated, which is beneficial to increase the light energy utilization rate.

[0058] It's worth noting that when using this sight, the information observed by the human eye 6 will vary depending on the light source used. When a single light source is used, the sight is a single-light source, non-pupil-expanding system. For example, when the single light source is a red dot, the collimating element collimates the beam, forming a first parallel beam that is transmitted to the holographic waveguide 5. The holographic waveguide 5 redirects the first parallel beam and transmits it through total internal reflection, forming a second parallel beam that is emitted to the human eye 6. At this point, the human eye 6 perceives the red dot information.

[0059] In order to enable the user to see more information through the sight, the outcoupling area is also set on the white light path, and the transmission direction of the second parallel light beam is consistent with the transmission direction of the white light after entering the sight. After diffraction by the outcoupling area, the white light is emitted to the human eye 6 together with the second parallel light beam formed based on the light source.

[0060] Specifically, while a single light source is employed, an outcoupling region is also provided on the white light path. The white light and the single light source are diffracted by the outcoupling region and then emitted to the human eye 6. In other words, the scope is a dual-light, non-pupil-expanding system consisting of white light and a single light source. When the single light source employed is a red dot, the human eye 6 can simultaneously see the red dot information and the real scene through the white light direct path.

[0061] When multiple light sources are used, the pupil expansion system is also referred to as a multiple light source non-pupil expansion system. For example, if the light source includes a first light source 1 and a second light source 2, a dual-light source non-pupil expansion system is formed, consisting of the first light source 1 and the second light source 2. Furthermore, if multiple light sources are used, the outcoupling region can be positioned on the white light path, forming a multiple light non-pupil expansion system consisting of white light and multiple light sources. If the white light and the first light source 1 and the second light source 2 are diffracted by the outcoupling region and emitted to the human eye 6, a three-light fusion non-pupil expansion system is formed, consisting of the white light, the first light source 1, and the second light source 2.

[0062] In practice, the sight includes a hologram 7, which is located along the transmission path of the second parallel light beam. It is noteworthy that when the light source includes a laser, the wavelength of the laser is the same as the wavelength of the reference light used to create the hologram 7, ensuring that the graticule information on the hologram 7 can be seen.

[0063] In order to enable the user to see more information through the sight, the outcoupling area and the hologram 7 are also arranged on the white light path, and the transmission direction of the second parallel light beam is consistent with the transmission direction of the white light after entering the sight. After diffraction by the outcoupling area, the white light is transmitted to the hologram 7 together with the second parallel light beam formed based on the light source, and finally emitted to the human eye 6. Figure 5 This is a schematic diagram of a sighting scope provided by the third embodiment of the present utility model, compared with Figure 4 It can be seen that Figure 5 A hologram 7 is added to the outcoupling area. The hologram 7 is used in conjunction with the holographic waveguide 5. When the laser is irradiated into the hologram 7, various preset targets can be generated. The green or red film in the hologram 7 can make the target appear in different colors, improving the user experience.

[0064] exist Figure 5In the schematic diagram of the provided sight, the first light source 1 is an image source, such as a micro display screen, used to display images formed by different channels or other information that needs to be displayed; the second light source 2 is a laser light source, used to illuminate the hologram 7 to form an infinitely distant target; the light combining element 3 is a semi-transparent and semi-reflective mirror, which is at a 45° angle to the main optical axis of the laser light source and the micro display screen, and is used to deflect the light emitted by the micro display screen so that it merges with the light emitted by the laser light source; the collimating element 4 is used to receive the light emitted by the laser light source and the micro display screen, correct the internal aberration, and emit it as parallel light into the holographic waveguide plate 5; the coupling area of the holographic waveguide plate 5 is connected to the holographic waveguide plate 5. The collimated light is received. The holographic grating in this area changes the propagation direction of the incident collimated light, causing the light to be totally reflected toward the inside of the waveguide. After the light reaches the outcoupling area, the propagation direction is changed again by the holographic light in the outcoupling area, causing it to propagate toward the human eye 6. Since the outcoupling area is a semi-transparent medium, the light from the external scene can directly pass through the outcoupling area to propagate. The laser light source is irradiated on the hologram 7 through the outcoupling area to form a preset infinitely far target. The red or green film on the hologram 7 can make the target display different colors, allowing the user to customize the shape and color of the target. The human eye 6 is used to receive the fused light of the target, the micro display screen and the external scene.

[0065] It is worth noting that when using a sight containing a hologram 7, the information observed by the human eye 6 will vary depending on the light source employed. When a single light source is used, the sight is a single-light, non-pupil-expanding system. For example, a laser light source emits a beam; the collimating element 4 collimates the beam into parallel light, which is incident on the outcoupling region. The outcoupling region receives the incident beam and then incidents it on the hologram 7 as parallel light. The human eye 6 then captures the gradation information recorded on the hologram 7. To enable the user to see more information through the sight, in addition to using a single light source, the outcoupling region is also placed on the white light path. This means that the sight is a dual-light, non-pupil-expanding system consisting of white light and a single light source. When a laser light source is used as the single light source, the human eye 6 can view the gradation information recorded on the hologram 7 while also perceiving the real scene in the white light direct path.

[0066] When the light source used is a multi-light source, the sight is also called a multi-light source non-pupil dilation system. For example, if a first light source 1 and a second light source 2 are used, a dual-light non-pupil dilation system consisting of the first light source 1 + the second light source 2 is formed. In addition, based on the fact that the light source used is a multi-light source, the outcoupling area is also set on the white light path, then a multi-light non-pupil dilation system consisting of white light + multiple light sources is formed. For example, a three-light fusion non-pupil dilation system consisting of white light + the first light source 1 + the second light source 2 is formed. When the first light source 1 is a laser light source and the second light source 2 is an image source, the sight can see the holographic division information and the image source information without any obstruction to the white light direct channel, and the real scene of the white light direct channel can also be seen. That is, the user uses the sight to ensure the amount of light entering the human eye 6, so that the user can accurately observe the multi-channel image.

[0067] The sight provided by the embodiment of the present invention utilizes a holographic waveguide plate 5 to change the propagation path of the light beam to achieve the optical path effect of a reflective sight, while avoiding the problems of large size and weight or poor target display effect of reflective sights. It has the advantages of small size, light weight, and good display effect. The area of the coupled-in image incident on the holographic waveguide plate 5 is consistent with the area of the coupled-out image from the holographic waveguide plate 5, making the holographic waveguide plate 5 a non-pupil dilation holographic waveguide plate 5. The coupled-in image does not need to be replicated within the holographic optical waveguide, that is, the area of the coupled-in image is consistent with the area of the coupled-out image, reducing the optical efficiency loss caused by image replication. At the same time, the dimensions of the coupled-in area and the coupled-out area are the same and both larger than a preset size, so that the non-pupil dilation holographic optical waveguide also has a large exit pupil effect, high-quality coupled-out images, low optical efficiency loss, and a good observation experience. The light beam is transmitted by total reflection in the holographic waveguide plate 5, avoiding transmission, further reducing light loss, increasing the amount of light entering the human eye 6, and greatly improving the user experience. The system has the advantages of small size and light weight of a red dot sight, as well as the advantages of clear, color-free targets and high stability of a holographic sight, greatly improving the user experience.

[0068] A holographic optical waveguide and a sight have been described above. Embodiments of the present invention also provide an augmented reality (AR) device, including the aforementioned holographic optical waveguide or sight. The AR device provided in this embodiment has the same or corresponding technical features as the holographic optical waveguide or sight described above. The embodiments of the holographic optical waveguide and sight have been described in detail above, so the AR device will not be further described here; the effects are the same as above.

[0069] The above describes in detail the holographic optical waveguide, sight, and AR device provided by the present invention. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to in detail. It should be noted that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the present invention.

[0070] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

Claims

1. A holographic optical waveguide, characterized in that: The holographic waveguide plate (5) comprises a coupling-in region and a coupling-out region respectively provided at two ends of the holographic waveguide plate (5); the sizes of the coupling-in region and the coupling-out region are both larger than a preset size; and the sizes of the coupling-in region and the coupling-out region are the same, or the size difference between the coupling-in region and the coupling-out region is smaller than a preset threshold; The coupling-in region is used to receive a first parallel light beam, and causes the first parallel light beam to change its transmission direction and then undergo total reflection transmission in the holographic waveguide plate (5); the coupling-out region is used to receive the light beam after total reflection transmission and causes the light beam to change its transmission direction and then form a second parallel light beam for emission; The size of the area of the coupled-in image incident on the holographic waveguide plate (5) is consistent with the size of the area of the coupled-out image from the holographic waveguide plate (5).

2. The holographic optical waveguide according to claim 1, characterized in that: The sizes of the coupling-in region and the coupling-out region are both larger than the preset sizes, specifically: the sum of the area of the coupling-in region and the area of the coupling-out region is larger than 70% of the area of the holographic waveguide plate (5).

3. The holographic optical waveguide according to claim 1, characterized in that: A hologram (7) is provided on the light-emitting side of the outcoupling region, and the hologram (7) is located on the transmission path of the second parallel light beam.

4. The holographic optical waveguide according to claim 3, characterized in that: The hologram (7) is attached to the holographic waveguide plate (5) by means of embossing, etching, masking or exposure and development.

5. A sighting scope, characterized in that: include: A light source, a collimating element (4), and a holographic optical waveguide according to any one of claims 1 to 4; The light source is provided at one side of the coupling-in region of the holographic optical waveguide and is used to emit a light beam; The collimating element (4) is provided between the light source and the holographic optical waveguide, and is used for collimating the light beam emitted by the light source to form the first parallel light beam and transmit it to the holographic optical waveguide; The holographic optical waveguide is used to change the transmission direction of the first parallel light beam and then perform total reflection transmission, thereby forming the second parallel light beam to be emitted to the human eye (6).

6. The sight according to claim 5, characterized in that When the light source includes a laser light source, the wavelength of the laser light source is the same as the wavelength of the reference light used when preparing the hologram (7).

7. The sight according to claim 5, characterized in that The outcoupling region is also arranged on the white light path, and the transmission direction of the second parallel light beam is consistent with the transmission direction of the white light after entering the sight. After the white light is diffracted by the outcoupling region, it is emitted to the human eye together with the second parallel light beam formed based on the light source (6).

8. The sight according to claim 5, characterized in that The outcoupling region and the hologram (7) are also arranged on the white light path, and the transmission direction of the second parallel light beam is consistent with the transmission direction of the white light after entering the sight. After the white light is diffracted by the outcoupling region, it is transmitted together with the second parallel light beam formed based on the light source to the hologram (7), and finally emitted to the human eye (6).

9. The sight according to any one of claims 5 to 8, characterized in that: The light source is a single light source; or, the light source comprises a first light source (1) and a second light source (2), a light combining element (3) is provided on the optical path between the light source and the collimating element (4), and a light beam emitted by the first light source (1) and a light beam emitted by the second light source (2) are combined by the light combining element (3) and then transmitted to the collimating element (4).

10. The sight according to claim 9, characterized in that The first light source (1) and the second light source (2) are light sources of the same type or light sources of different types; wherein the light source types include at least a point light source type, an image source type and a laser light source type.

11. The sight according to claim 9, wherein: The light combining element (3) is a semi-transparent, semi-reflective mirror; the first light source (1) and the second light source (2) are respectively located on both sides of the semi-transparent, semi-reflective mirror, and the semi-transparent, semi-reflective mirror is placed at 45 degrees relative to the center line of the light beam emitted by the first light source (1), and the semi-transparent, semi-reflective mirror is placed at 45 degrees relative to the center line of the light beam emitted by the second light source (2).

12. An AR device, characterized in that: The invention comprises the holographic optical waveguide according to any one of claims 1 to 4, or the sight according to any one of claims 5 to 11.

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