Multi-focal-plane optical system

Abstract

The invention belongs to the field of optical display, and particularly relates to a multi-focal-plane optical system, which comprises a light source for emitting required light; the plane light splitting assembly is arranged opposite to the light source so as to receive light rays emitted by the light source; the curved light splitting assembly is arranged opposite to the plane light splitting assembly, the curved light splitting assembly at least comprises a first optical effective surface and a second optical effective surface which are opposite to each other, and the first optical effective surface and the second optical effective surface at least comprise an area capable of reflecting light rays and an area capable of transmitting light rays; an area capable of transmitting light on the first optical effective surface at least partially corresponds to an area capable of reflecting light on the second optical effective surface; light rays emitted by the light source are sequentially reflected by the plane light splitting assembly, reflected by the first optical effective surface and transmitted by the plane light splitting assembly to form a first image with a first focal plane depth; light emitted by the light source is reflected by the plane light reflecting assembly, transmitted by the first optical effective surface, reflected by the second optical effective surface, transmitted by the first optical effective surface and transmitted by the plane light splitting assembly in sequence to form a second image with a second focal plane depth, and the first focal plane depth is different from the second focal plane depth; through the arrangement, a plurality of focal planes are formed so as to carry out myopia intervention.

Description

Technical Field

[0001] This application belongs to the field of optical display, and more particularly relates to a multi-focal plane optical system. Background Art

[0002] Regarding the common pseudomyopia in children, different methods can be used for artificial intervention to slow down or correct the development of myopia. Among them, the intervention method based on the near-eye display optical system has developed rapidly.

[0003] Using defocus imaging can inhibit the occurrence of myopia to a certain extent. The principle is as follows: among the formed image planes with multiple different focal plane depths, at least one image plane falls on the retina of the viewer, so that the viewer can clearly see this image plane; other image planes fall in front of the viewer's retina, stimulating the viewer to want to see other image planes clearly, that is, generating a force to pull the retina forward, thereby inhibiting the elongation of the eye axis to a certain extent and even alleviating the degree of myopia to a certain extent. Summary of the Invention

[0004] This application is precisely proposed based on the above-mentioned needs of the prior art. The technical problem to be solved by this application is to provide a multi-focal plane optical system to form multiple focal planes to intervene in myopia.

[0005] To solve the above problems, the technical solutions provided by this application include:

[0006] Provided is a multi-focal plane optical system, including: a light source that emits required light; a planar beam splitter component that is disposed opposite to the light source to receive the light emitted from the light source; a curved beam splitter component that is disposed opposite to the planar beam splitter component. The curved beam splitter component at least includes a first optically effective surface and a second optically effective surface that are opposite to each other. At least the first optically effective surface and the second optically effective surface include regions capable of reflecting light and regions capable of transmitting light. The region on the first optically effective surface capable of transmitting light at least partially corresponds to the region on the second optically effective surface capable of reflecting light. After the light emitted from the light source passes through the reflection of the planar beam splitter component, the reflection of the first optically effective surface, and the transmission of the planar beam splitter component in sequence, a first image with a first focal plane depth is formed; after the light emitted from the light source passes through the reflection of the planar reflector component, the transmission of the first optically effective surface, the reflection of the second optically effective surface, the transmission of the first optically effective surface, and the transmission of the planar beam splitter component in sequence, a second image with a second focal plane depth is formed, and the first focal plane depth and the second focal plane depth are different.

[0007] Through the above settings, in the same optical system, at least a part can be reflected on the first optical effective surface, and a part can be reflected on the second optical effective surface. The light passing through the first optical effective surface forms a first image, and the light passing through the second optical effective surface forms a second image. Due to different light propagation paths, the depth of focus of the first image and the second image is different, and the imaging positions in the eye are also different, that is, defocus is formed in the eye. By adjustment, a defocus stimulus can be formed in the eye, thereby suppressing the elongation of the eye axis to a certain extent.

[0008] Preferably, the curved beam splitting component includes a plurality of beam splitting films. The plurality of beam splitting films are arranged side by side as a plurality of optical effective surfaces, and there is a preset gap between adjacent beam splitting films.

[0009] Through the above settings, the light incident on the curved beam splitting component forms two optical paths, a part of the light is transmitted, and a part of the light is reflected. The beam splitting film that first receives the light forms a first image with a first depth of focus after reflection. The light transmitted through the front beam splitting film is incident on the rear beam splitting film and reflected to form other images with a depth of focus different from the first depth of focus. A preset gap is set between adjacent beam splitting films to clearly distinguish the positions of the formed images.

[0010] Preferably, the curved beam splitting component includes a plurality of film layers. The film layers are formed by a combination of total reflection films, antireflection films or total reflection films and antireflection films. The plurality of film layers are arranged side by side as a plurality of optical effective surfaces, and there is a preset gap between adjacent film layers; in the film layers, at least part of the area where the antireflection film is located in the film layer that relatively first receives the light is oppositely arranged to the area where the reflection film is located in the film layer that relatively later receives the light.

[0011] Through the above settings, the light incident on the film layer is transmitted, reflected or transmitted and reflected, so as to form a plurality of images with different depths of focus, creating an environment for forming a defocus stimulus in the viewer's eye.

[0012] Preferably, in the plurality of film layers of the curved beam splitting component, the film layer that finally receives the light is a total reflection film.

[0013] Such a setting is to make the last film layer reflect the remaining received light to improve the utilization rate of light.

[0014] Preferably, in the plurality of film layers of the curved beam splitting component, the area where the reflection film is located in the film layer that relatively later receives the light corresponds to the area where the antireflection film is located in the film layer that relatively first receives the light.

[0015] Through the above settings, the area of the reflection film is arranged in a targeted manner to achieve multi-focal plane imaging while saving costs.

[0016] Preferably, the center of the area where the total reflection film is arranged in the same film layer overlaps with the center of the film layer.

[0017] Through the above settings corresponding to the viewer's field of view, a good viewing experience can be brought, so as to extend the viewer's usage time to a certain extent, and then improve the viewing effect.

[0018] Preferably, the area where the total reflection film is arranged in the same film layer is centrosymmetrically arranged with the center of the film layer as the center, and the area where the antireflection film is arranged in the same film layer is centrosymmetrically arranged with the center of the film layer as the center.

[0019] Through the above settings corresponding to the viewer's field of view, a good viewing experience can be brought, so as to extend the viewer's usage time to a certain extent, and then improve the viewing effect.

[0020] Preferably, the curved surface beam splitting component further includes a curved surface bearing plate capable of transmitting light, the thickness of the curved surface bearing plate is adapted to the preset gap, a plurality of the curved surface bearing plates are respectively arranged between adjacent beam splitting films or adjacent film layers, and both sides of the curved surface bearing plate are attached to the beam splitting film or the film layer.

[0021] By setting the curved surface bearing plate to provide support for the beam splitting film or the film layer, and at the same time, the light transmissivity of the curved surface bearing plate can effectively ensure the passing of light, forming images with different focal plane depths.

[0022] Preferably, the distance range between the exit pupil position of the multi-focal plane optical system and the center of the side of the planar beam splitting component close to the exit pupil position is 17 mm to 25 mm.

[0023] Through the above settings to ensure the normal imaging of the multi-focal plane optical system.

[0024] Preferably, the included angle range between the surface of the planar beam splitting component and the optical axis of the multi-focal plane optical system is 35° to 45°.

[0025] Through the above settings to ensure the normal imaging of the multi-focal plane optical system.

[0026] Compared with the prior art, in the same optical system, through the division and setting of the functional areas of the optical effective surface, the incident light is subjected to different light treatments on the optical effective surface, so as to form images with different focal plane depths. Specifically, when the light is reflected on the optical effective surface, part of the light passes through the planar beam splitting component to form an image with a certain focal plane depth; when the light is transmitted on the optical effective surface and then reflected on other optical effective surfaces, the formed image has a different focal plane depth from the image directly reflected on the optical effective surface. By adjusting the optical parameters in the optical system, a defocusing stimulus can be formed in the eye, so as to intervene in myopia. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the embodiments of this specification. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Optical path schematic diagram of the optical system forming a double focal plane in the embodiment of the present application;

[0029] Figure 2 Optical path schematic diagram of forming the second image in the double focal plane optical system of the embodiment of the present application;

[0030] Figure 3 Optical path schematic diagram of forming the first image in the double focal plane optical system of the embodiment of the present application;

[0031] Figure 4 Optical path schematic diagram of the optical system forming a double focal plane in the embodiment of the present application;

[0032] Figure 5 Schematic diagram of the curved surface splitting component in the double focal plane optical system of the embodiment of the present application;

[0033] Figure 6 Regional division diagram of the front surface of the curved surface bearing plate in the embodiment of the present application;

[0034] Figure 7 Regional division diagram of the back surface of the curved surface bearing plate in the embodiment of the present application;

[0035] Figure 8 Another regional division diagram of the front surface of the curved surface bearing plate in the embodiment of the present application;

[0036] Figure 9 Another regional division diagram of the back surface of the curved surface bearing plate in the embodiment of the present application;

[0037] Figure 10 Optical path schematic diagram of the optical system forming three focal planes in the embodiment of the present application;

[0038] Figure 11 Optical path schematic diagram of forming the first image in the triple focal plane optical system of the embodiment of the present application;

[0039] Figure 12 Optical path schematic diagram of forming the second image in the triple focal plane optical system of the embodiment of the present application;

[0040] Figure 13 Optical path schematic diagram of forming the third image in the triple focal plane optical system of the embodiment of the present application;

[0041] Figure 14 Schematic diagram of the optical system for forming a dual focal plane in the specific implementation manner of this application embodiment;

[0042] Figure 15 Schematic diagram of the optical system for forming a triple focal plane in the specific implementation manner of this application embodiment;

[0043] Figure 16 Schematic diagram of the curved surface beam splitting component in the triple focal plane optical system of this application embodiment.

[0044] Reference numerals:

[0045] 1. Light source; 2. Lens assembly; 3. Planar beam splitting component; 4. Curved surface beam splitting component; 5. Curved surface carrier plate; 601. Front surface; 602. Rear surface; 7. First region; 8. Second region; 9. First image; 10. Second image; 11. Third image; 12. First surface; 13. Second surface; 14. Third surface; 15. Fourth surface; 16. Exit pupil; 17. First beam splitting film; 18. Second beam splitting film; 19. First film; 20. Second film; 21. Third film. Specific implementation manner

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the protection scope of this application.

[0047] In the description of the embodiments of this application, it should be noted that unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in this application can be understood according to specific circumstances.

[0048] The terms "top", "bottom", "above...", "below", and "on..." used throughout the description are relative positions with respect to the components of the device, such as the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional and is independent of its orientation in space.

[0049] To facilitate the understanding of the embodiments of this application, the following will further explain with specific examples in conjunction with the accompanying drawings. The examples do not constitute a limitation to the embodiments of this application.

[0050] This embodiment provides a multi-focal plane imaging system, as Figures 1 - 16 shown.

[0051] As Figure 1 shown, the multi-focal plane imaging system includes a light source 1, a lens assembly 2, a planar beam splitter, and a curved optical component.

[0052] The light source 1 provides a light source for the multi-focal plane imaging system.

[0053] The lens assembly 2 is disposed opposite to the light source 1 to correct the field curvature of the multi-focal plane imaging system.

[0054] The planar beam splitting component 3 is disposed opposite to the light source 1. The planar beam splitting component 3 can split the incident light into two optical paths emitted in different directions. Specifically, the planar beam splitting component 3 can allow a part of the incident light to propagate out of the planar beam splitting component 3 from the side far from the incident surface along the original propagation direction, and make another part of the incident light output from the incident surface in a reflected form. The splitting ratio of the planar beam splitting component 3 determines the ratio of the light incident on the planar beam splitter to be reflected and transmitted. Further, the splitting ratio of the planar beam splitting component 3 is 1:1. Exemplarily, the planar beam splitting component 3 includes a beam splitting film. When light is incident on the beam splitting film, reflection and refraction occur. However, due to the flexible nature of the beam splitting film, an additional carrier plate for supporting the beam splitting film needs to be provided to ensure the stability of the beam splitting film. The carrier plate allows the incident light to be transmitted, and the light at the transmission point has a substantially unchanged transmission path as the incident light. In addition, the planar beam splitting component 3 can be a planar beam splitter, which can also achieve the above functions and effects. Additionally, a polarization beam splitting element can also be used to implement the splitting process to improve the light energy utilization rate of the optical system.

[0055] After the light emitted by the light source 1 is corrected by the lens assembly 2, it is incident on the planar beam splitting component 3, and two optical paths are output, one of which is emitted in a reflected form and the other is emitted in a transmitted manner.

[0056] The curved optical component is disposed opposite to the planar beam splitter. The curved optical component is concave in shape and recessed in a direction away from the planar beam splitter. The curved optical component includes at least two optically effective surfaces, which are disposed in the optical path formed by the multi-focal plane imaging system. The optically effective surface includes at least a reflection area capable of reflecting incident light and a transmission area capable of allowing incident light to be transmitted.

[0057] When observed from the position of the exit pupil 16, the field angles of the optical paths shown by different focal planes within the multi-focal plane optical system formed above are all greater than 40°. When observed along the optical axis direction, the distance range between the position of the exit pupil 16 and the center of the first surface of the planar beam splitter assembly 3 that first receives light is 17 mm to 25 mm. Taking the local coordinate system at the position of the exit pupil 16 as a reference, that is, taking the position of the exit pupil 16 as the origin, a coordinate plane perpendicular to the optical axis is formed. With the optical axis direction as the right side, the x-axis is in the front direction and the y-axis is in the upward direction. The included angle range between the plane where the planar beam splitter assembly 3 is located and the plane formed by the x-axis and the optical axis is 35° to 45°; the included angle range between the plane where the light source 1 is located and the plane formed by the x-axis and the optical axis is 76° to 90°.

[0058] Multiple focal planes are formed by setting the curved beam splitter assembly 4, and the following settings can enable the multi-focal plane imaging system to finally have two focal planes.

[0059] As Figure 5 shown, the curved optical component includes a curved carrier plate and a beam splitting film. The curved carrier plate includes a front surface 601 and a rear surface 602. The front surface 601 is the surface close to and opposite to the planar beam splitter assembly 3, and the rear surface 602 is the surface far from the beam splitter assembly and opposite to the front surface 601. The beam splitting films are respectively plated on the front surface 601 and the rear surface 602. For the convenience of description, the beam splitting film plated on the front surface 601 is the first beam splitting film 17, and the film plated on the rear surface 602 is the second beam splitting film 18. Preferably, the beam splitting ratio of the first beam splitting film 17 is 1:2, that is, 1 / 3 of the incident light will be reflected, and the remaining 2 / 3 of the incident light will pass through. The beam splitting ratio of the second beam splitting film 18 is 3:2, that is, 3 / 5 of the incident light will be reflected, and the remaining 2 / 5 of the incident light will be transmitted. At this time, if the image brightness of the first image 9 with the first focal plane depth formed finally is 1, the image brightness of the second image 10 with the second focal plane depth formed finally is 0.8. The specific optical path for forming the final image is: As Figure 3 shown, the light emitted by the light source 1 and emitted in a reflected form after passing through the planar beam splitter assembly 3 will be incident on the curved beam splitter assembly 4, first incident on the first beam splitting film 17, and after being reflected by the first beam splitting film 17, it will be incident on the planar beam splitter assembly 3 for the second time, and after passing through the planar beam splitter assembly 3 by transmission, it will be emitted towards the position of the exit pupil 16, forming the first image 9 with the first focal plane depth. As Figure 2As shown, in addition to being reflected, the light incident on the first beam splitting film 17 will transmit through the first beam splitting film 17 and emit towards the second beam splitting film 18. Part of the light incident on the second beam splitting film 18 will transmit and emit in a direction substantially the same as the incident direction, and the other part of the light will be reflected by the second beam splitting film 18 and emit towards the direction where the first beam splitting film 17 is located. After part of the light transmits through the first beam splitting film 17, it reaches the planar beam splitting assembly 3 for the second time, and at least part of the light passes through the planar beam splitting assembly 3 and emits towards the exit pupil 16 position, forming a second image 10 with a second focal depth. The focal depth is the distance from the human eye to the focal plane. Due to the difference in the light propagation paths during the formation processes of the first image 9 and the second image 10, the first focal depth and the second focal depth do not overlap, that is, an image with two focal planes can be formed in the viewer's eyes. By setting such that at least one focal plane can fall on the viewer's retina and the other focal plane falls in front of the viewer's retina, a force that drives the retina to move forward can be formed when the viewer can see part of the image clearly, effectively preventing the eye axis from moving backward or maintaining an elongated state and thus forming myopia.

[0060] Further, in order to improve the utilization rate of light, that is, to ensure the brightness of the final image, a total reflection film is deposited on the rear surface 602 of the curved bearing plate, so that when the light passes through the first beam splitting film 17 and is incident on the total reflection film, the total reflection film can reflect all the incident light, avoiding part of the light from emitting to the outside in a transmitted form.

[0061] Still further, in order to improve the viewability of the final image, the coatings on the front surface 601 and the rear surface 602 of the curved bearing plate are further set. Specifically, an anti-reflection film and a total reflection film are deposited on the front surface 601. Correspondingly, a total reflection film is deposited at the area on the rear surface 602 corresponding to the area where the anti-reflection film is deposited on the front surface 601.

[0062] Exemplarily, a total reflection film is set in the first area 7 of the front surface 601, an anti-reflection film is set outside the first area 7, a total reflection film is set in the second area 8 of the rear surface 602, and an anti-reflection film is set outside the second area 8. The second area 8 at least partially corresponds to the other areas of the front surface 601 except the first area 7. As Figure 6 and Figure 7 shown, the shapes of the first area 7 and the second area 8 can be rectangular, as Figure 8 and Figure 9As shown, it can also be circular and adapted to the eye's field of view, and there are no specific restrictions on the shape of the area. Through the above settings, the light reaching the first area 7 of the front surface 601 is reflected and emitted onto the planar beam splitter assembly 3, and at least partially transmitted through the planar beam splitter assembly 3 and emitted towards the pupil 16 position, forming the first image 9; the light incident outside the first area 7 of the front surface 601 passes through the antireflection film and is incident on the total reflection film in the second area 8 of the rear surface 602. After reflection, it is transmitted through the antireflection film on the front surface 601 and at least partially transmitted through the planar beam splitter assembly 3 and emitted towards the pupil 16 position, forming the second image 10.

[0063] Further, the center of the first area 7 coincides with the center of the front surface 601, the center of the second area 8 coincides with the center of the rear surface 602, and the first area is centrosymmetrically arranged with the front surface as the center, and the second area is centrosymmetrically arranged with the center of the rear surface as the center. Still further, a total reflection film is provided in other areas of the rear surface 602 outside the area corresponding to the first area 7.

[0064] Similarly, it also holds that films of opposite types are deposited in different areas on the two optically effective surfaces. That is, an antireflection film is provided in the first area 7 of the front surface 601, a total reflection film is provided outside the first area 7, a total reflection film is provided in the second area 8 of the rear surface 602, and an antireflection film is provided outside the second area 8. In this case, images of two focal planes can also be formed.

[0065] For the setting of the antireflection film and the total reflection film on the front surface 601 and the rear surface 602, it is only necessary to provide a total reflection film on the area of the rear surface 602 corresponding to the area where the antireflection film is provided on the front surface 601. To save costs, there is no need to coat the area of the rear surface 602 corresponding to the area where the total reflection film is provided on the front surface 601.

[0066] The following will give a specific embodiment. As Figure 14 shown, in an optical multi-focal plane system with an optical path capable of forming two focal planes, based on the parameter settings in Table 1, the focal plane depth of the first image relative to the human eye is +2D, the diagonal field of view angle is 40°, and the focal length is 21.9 mm.

[0067] Table 1:

[0068]

[0069]

[0070] Among the above surfaces, the surfaces constituting the aspherical surface satisfy the equation: c is the reciprocal of the radius of curvature, r is the radial distance of a point on the surface, k is the quadric constant, and A i is the coefficient of the higher-order term.

[0071] Based on the parameter settings in Table 2, the focal plane depth of the second image relative to the human eye is -0.4D, the diagonal field of view angle is 40°, and the focal length is 21.8 mm.

[0072] Table 2:

[0073]

[0074]

[0075] The coefficients of each aspheric surface in the above embodiments are shown in Table 3.

[0076] Table 3:

[0077]

[0078]

[0079] Here, another specific embodiment is given. Similarly, in an optical system with multiple focal planes in an optical path that can form two focal planes, based on the parameter settings in Table 4, the focal plane depth of the first image relative to the human eye is -0.4D, the diagonal field of view angle is 40°, and the focal length is 21.2 mm.

[0080] Table 4:

[0081]

[0082]

[0083] Based on the parameter settings in Table 5, the focal plane depth of the second image relative to the human eye is +2D, the diagonal field of view angle is 40°, and the focal length is 20.3 mm.

[0084] Table 5:

[0085]

[0086]

[0087] The coefficients of each aspheric surface in the above embodiments are shown in Table 6.

[0088]

[0089] Furthermore, as Figure 10 shown, by setting the curved surface beam splitter assembly 4, an optical system with multiple focal planes that can form three focal planes can be formed.

[0090] As Figure 16As shown, the curved surface beam splitting component 4 includes a curved surface carrier plate group, and the curved surface carrier plate group includes two curved surface carrier plates arranged side by side. The effective optical surfaces of the curved surface carrier plates are named the first surface 12, the second surface 13, the third surface 14, and the fourth surface 15 in the order of receiving light by the curved surface carrier plate group. A first film 19 is deposited on the first surface 12, a second film 20 is deposited between the second surface 13 and the third surface 14, and a third film 21 is deposited on the fourth surface 15. The first film 19, the curved surface carrier plate, the second film 20, the curved surface carrier plate, and the third film 21 are closely arranged.

[0091] In order to finally form an image with three focal planes, the first film 19 includes a total reflection film and an anti-reflection film. The total reflection film is deposited in the first area of the first surface, and the anti-reflection film is deposited in the remaining area; the second film 20 includes a total reflection film and an anti-reflection film. The total reflection film is deposited in the second area of the second / third surface, and the anti-reflection film is deposited in the remaining area; the third film 21 includes a total reflection film and an anti-reflection film. The total reflection film is deposited in the third area of the fourth surface, and the anti-reflection film is deposited in the remaining area; or the third film is a total reflection film. The remaining area of the first film 19 at least corresponds to the second area 8 or the third area, and the remaining area of the second area 8 at least corresponds to the third area. So that light can be incident on the first film, the second film, and the third film and be reflected.

[0092] As Figure 15 shown, based on the above settings, a first image 9 with a first focal plane depth, a second image 10 with a second focal plane depth, and a third image 11 with a third focal plane depth can be formed. As Figure 11 shown, the formation optical path of the first image 9 is specifically as follows: The light emitted by the light source 1 passes through the transmission of the lens component 2 and the reflection of the plane beam splitting component 3 in sequence, and then is incident on the total reflection film of the first film 19. After reflection, it is incident on the plane beam splitting component 3 again and at least partially passes through the plane beam splitting component 3 and is emitted toward the exit pupil 16 position to form the first image 9. Figure 12 shown, the formation optical path of the second image 10 is specifically as follows: The light emitted by the light source 1 passes through the lens component 2 and the plane beam splitting component 3 in sequence, and then is incident on the curved surface beam splitting component 4. It passes through the anti-reflection film on the first film 19 and is incident on the total reflection film in the second area 8. After reflection, it passes through the anti-reflection film on the first film 19 again, is incident on the plane beam splitting component 3 for the second time, and at least partially passes through the plane beam splitting component 3 and is emitted toward the exit pupil 16 position to form the second image 10. Figure 13As shown, the optical path for forming the third image 11 is specifically as follows: The light rays emitted by the light source 1 sequentially pass through the lens assembly 2 and the planar beam splitter assembly 3, and then are incident on the curved beam splitter assembly 4. They sequentially pass through the anti-reflection coatings on the first film 19 and the second film 20, and are incident on the total reflection film in the third region. After reflection, they sequentially pass through the anti-reflection coatings on the second film 20 and the anti-reflection coating in the first film 19, and are incident on the planar beam splitter assembly 3 for the second time, and at least partially pass through the planar beam splitter assembly 3 and are emitted towards the exit pupil 16 position to form the third image 11.

[0093] The following will give a specific embodiment. In an optical path multi-focal plane optical system capable of forming an optical path with three focal planes, based on the parameter settings in Table 7, the focal plane depth of the first image relative to the human eye is -0.2D, the diagonal field of view angle is 40°, and the focal length is 20.5 mm.

[0094] Table 7:

[0095]

[0096] Based on the parameter settings in Table 8, the focal plane depth of the second image relative to the human eye is -5D, the diagonal field angle is 40°, and the focal length is 20.23 mm.

[0097] Table 8:

[0098]

[0099] Based on the parameter settings in Table 9, the focal plane depth of the second image relative to the human eye is +3.3D, the diagonal field angle is 40°, and the focal length is 19.46 mm.

[0100] Table 9:

[0101]

[0102] The coefficients of each aspherical surface in the above embodiment are shown in Table 10.

[0103] Table 10:

[0104]

[0105]

[0106] By setting the curved beam splitter assembly 4, different optical paths of light rays are formed on the curved beam splitter assembly 4, thereby generating images with different focal planes.

[0107] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present application. It should be understood that the above description is only the specific embodiments of the present application and is not used to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A multi-focal plane optical system, characterized in that, Comprising: A light source that emits required light; A planar beam splitter assembly disposed opposite to the light source to receive the light emitted from the light source; A curved beam splitter assembly disposed opposite to the planar beam splitter assembly. The curved beam splitter assembly at least includes a first optically effective surface and a second optically effective surface opposite to each other. At least regions capable of reflecting light and regions capable of transmitting light are included on the first optically effective surface and the second optically effective surface. The region capable of transmitting light on the first optically effective surface at least partially corresponds to the region capable of reflecting light on the second optically effective surface; After the light emitted from the light source sequentially passes through the reflection of the planar beam splitter assembly, the reflection of the first optically effective surface, and the transmission of the planar beam splitter assembly, a first image with a first focal depth is formed; after the light emitted from the light source sequentially passes through the reflection of the planar reflector assembly, the transmission of the first optically effective surface, the reflection of the second optically effective surface, the transmission of the first optically effective surface, and the transmission of the planar beam splitter assembly, a second image with a second focal depth is formed. The first focal depth and the second focal depth are different.

2. The multi-focal plane optical system according to claim 1, characterized in that The curved beam splitter assembly includes a plurality of beam splitting films. The plurality of beam splitting films are arranged side by side as a plurality of optically effective surfaces, and a preset gap exists between adjacent beam splitting films.

3. The multi-focal plane optical system according to claim 1, characterized in that, The curved beam splitter assembly includes a plurality of film layers formed by a combination of total reflection films, antireflection films, or total reflection films and antireflection films. The plurality of film layers are arranged side by side as a plurality of optically effective surfaces, and a preset gap exists between adjacent film layers; In the film layer, at least part of the region where the antireflection film is located in the film layer that relatively receives light first is disposed opposite to the region where the reflection film is located in the film layer that relatively receives light later.

4. The multi-focal plane optical system according to claim 3, characterized in that, Among the plurality of film layers of the curved beam splitter assembly, the film layer that finally receives light is a total reflection film.

5. The multi-focal plane optical system according to claim 3, characterized in that, For the plurality of film layers of the curved beam splitter assembly, the region where the antireflection film is located in the film layer that relatively receives light first corresponds to the region where the reflection film is located in the film layer that relatively receives light later.

6. The multi-focal plane optical system according to claim 3, wherein, The center of the region where the total reflection film is disposed in the same film layer overlaps with the center of the film layer.

7. The multi-focal optical system according to claim 5, characterized in that, The region where the total reflection film is disposed in the same film layer is centrosymmetrically arranged with the center of the film layer as the center, and the region where the antireflection film is disposed in the same film layer is centrosymmetrically arranged with the center of the film layer as the center.

8. The multi-focal optical system according to any one of claims 2-6, characterized in that, The curved beam splitter assembly further includes a curved carrier plate capable of transmitting light. The thickness of the curved carrier plate is adapted to the preset gap. A plurality of the curved carrier plates are respectively disposed between adjacent beam splitting films or adjacent film layers, and both sides of the curved carrier plate are attached to the beam splitting films or film layers.

9. The multi-focal plane optical system according to claim 1, characterized in that, The distance range between the exit pupil position of the multi-focal plane optical system and the center of the surface of the planar beam splitter assembly close to the exit pupil position is 17 mm to 25 mm.

10. The multi-focal plane optical system according to claim 1, characterized in that, The included angle range between the surface of the planar beam splitter assembly and the optical axis of the multi-focal plane optical system is 35° to 45°.

11. The multi-focal plane optical system according to claim 1, wherein The multi-focal plane optical system further includes a lens assembly, and the lens assembly is disposed between the light source and the planar beam splitter assembly.

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