Double-focal-plane HUD system plated with polarization selection type reflecting film and vehicle
By using the primary mirror and secondary mirror combined with polarization selection type reflective film design in the HUD system, the problem of excessive volume of the bifocal HUD system is solved, the bifocal effect in the limited space of the automobile is achieved, and the durability and optical performance of the reflective film are improved.
Patent Information
- Application Number
- CN202422631320.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-10-29
AI Technical Summary
The existing dual-focus HUD system has a large optical system and is difficult to effectively reduce in the limited space of the automobile.
The primary mirror and secondary mirror reflect twice, combined with the polarization selection type reflective film, light is reflected in different directions through the first and second type polarization reflective films to form two focal planes, reduce the linear distance of the optical path, and use vacuum coating technology to improve the durability and stability of the reflective film, and enhance structural stability through glue connections.
It realizes the bifocal effect in a smaller volume, meets the need for insufficient space in front of the car steering wheel, and improves the durability of the reflective film and the stability of optical performance, reducing vibration and reflection losses of the optical system.
Smart Images
Figure CN223296221U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of vehicle-mounted head-up displays, and in particular relates to a dual-focal-plane HUD system coated with a polarization-selective reflective film and a vehicle. Background Art
[0002] A head-up display (HUD), also known as a head-up display, is an optical virtual image display system. This system uses reflection or refraction through optical lenses to present various information related to the vehicle or aircraft's operation through a magnified virtual image directly in front of the driver's line of sight. The virtual image and the scenery appear simultaneously in the driver's field of view, allowing the driver to maintain their sightline above the road without having to look down at the instrument panel or center console. This effectively mitigates the aforementioned safety risks. Dual or multifocal planes refer to an optical system that produces two or more virtual images of varying focal lengths.
[0003] The image generated by the image generation unit undergoes several reflections before finally entering the human eye through the vehicle's windshield. The image produced by the optical system is virtual, and the aberrations introduced by the windshield are compensated for by the curvature of the reflector. Dual focal planes are typically achieved by designing two optical systems or utilizing different regions of a single optical system to project two focal plane images separately. The need to accommodate two optical paths increases the size of the optical system. Utility Model Content
[0004] In view of this, in order to solve the problems existing in the prior art, the purpose of the present invention is to provide a dual-focal plane HUD system and vehicle coated with a polarization-selective reflective film, which has the effect of achieving a dual-focal plane in a smaller volume.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A dual-focal-plane HUD system coated with a polarization-selective reflective film, comprising: an image generation unit, a primary reflector, a secondary reflector, and a windshield; the light-emitting end of the image generation unit is arranged toward the primary reflector and located between the primary reflector and the secondary reflector; the secondary reflector comprises a first layer structure and a second layer structure arranged in an overlapping manner; a first-type polarized reflective film is provided on a surface of the first layer structure facing the primary reflector; and a second-type polarized reflective film is provided on a surface of the second layer structure facing the first layer structure; the windshield is located above the secondary reflector, and the first-type polarized reflective film faces the windshield.
[0007] The specific technical effect is: by adopting the double reflection method of the primary reflector and the secondary reflector to fold the light path, the straight-line distance of the light path is reduced, which solves the problem of insufficient space in front of the steering wheel of the vehicle; the secondary reflector adopts two overlapping first-layer structures and second-layer structures, and a first-type polarized reflective film is set on the first-layer structure, and the light polarized in a certain direction is reflected through the windshield to form an image of a focal plane, and a second-type polarized reflective film is set on the second-layer structure, and the light polarized in another direction is reflected through the windshield to form an image of another focal plane. The design of the two polarized reflective films realizes a dual-focal-plane HUD system, without the need to design two optical systems, and the dual-focal-plane effect can be achieved with a smaller volume.
[0008] Furthermore, the reflection direction of the first type polarizing reflective film and the reflection direction of the second type polarizing reflective film are arranged to be orthogonal to each other.
[0009] The specific technical effect is: adopting the orthogonal setting design, when the light hits the first type polarized reflective film, the light polarized in a certain direction is reflected to form an image of a focal plane, while the light in the orthogonal direction passes through the first layer structure and hits the second type polarized reflective film, and is reflected by it to form an image of another focal plane.
[0010] Furthermore, the first type polarizing reflective film is disposed on the surface of the first layer structure facing the primary reflector by vacuum coating, and the second type polarizing reflective film is disposed on the surface of the second layer structure facing the first layer structure by vacuum coating.
[0011] The specific technical effect is: the use of vacuum coating can form a stronger bond between the coating and the substrate, improve the durability and service life of the reflective film, and the vacuum-plated reflective film has good uniformity, ensuring that the optical performance of the reflective film is more stable and reliable.
[0012] Furthermore, the first layer structure and the second layer structure are glued together.
[0013] The specific technical effects are: the gluing connection can make the first layer structure and the second layer structure form a whole, improve the structural stability of the entire optical system, reduce vibration and reflection loss, and the gluing connection can effectively prevent dust, moisture and other impurities from entering between the first layer structure and the second layer structure, protect the optical surface, and extend the service life. In addition, the gluing connection is usually lighter than the mechanical fixing method, which is conducive to the lightweight design of the entire optical system.
[0014] Furthermore, both the first layer structure and the second layer structure are free-form surface mirrors.
[0015] The specific technical effect is that both the first-layer structure and the second-layer structure use free-form surface mirrors, which can realize complex optical functions and correct aberrations.
[0016] Furthermore, the primary reflection mirror is a plane mirror.
[0017] The specific technical effects are: the plane mirror is easy to manufacture, the light path does not change after reflection, and it is convenient for light path design.
[0018] Furthermore, the primary reflection mirror is a free-form surface mirror.
[0019] The specific technical effect is: the primary reflector adopts a free-form surface mirror, which can realize complex optical functions and correct aberrations.
[0020] A vehicle comprises a dual-focal-plane HUD system coated with a polarization-selective reflective film as described in any one of the above items.
[0021] The beneficial effects of the utility model are:
[0022] (1) By adopting the method of double reflection of the primary reflector and the secondary reflector to fold the light path, the straight-line distance of the light path is reduced, thus solving the problem of insufficient space in front of the steering wheel of the car;
[0023] (2) The secondary reflector adopts two overlapping first-layer structures and second-layer structures, and a first-type polarized reflective film is set on the first-layer structure to reflect light polarized in a certain direction through the windshield to form an image of a focal plane. A second-type polarized reflective film is set on the second-layer structure to reflect light polarized in another direction through the windshield to form an image of another focal plane. The design of two polarized reflective films realizes a dual-focal-plane HUD system, without the need to design two sets of optical systems, and the dual-focal-plane effect can be achieved with a smaller volume.
[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0026] Figure 1 This is a schematic structural diagram of a dual-focal-plane HUD system coated with a polarization-selective reflective film according to the present invention;
[0027] Figure 2 It is a structural schematic diagram of the secondary reflector of the utility model;
[0028] Figure 3 yes Figure 1 Schematic diagram of the overall optical path;
[0029] Figure 4 yes Figure 3 Schematic diagram of the local light path;
[0030] Figure 5 yes Figure 3 Schematic diagram of the local light path from another perspective.
[0031] In the picture:
[0032] 1. Image generation unit; 2. Primary reflector; 3. Secondary reflector; 4. Windshield; 5. First layer structure; 6. Second layer structure; 7. First type polarized reflective film; 8. Second type polarized reflective film. DETAILED DESCRIPTION
[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. 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.
[0034] like Figures 1 to 5 As shown, a dual-focal plane HUD system coated with a polarization-selective reflective film includes: an image generation unit 1, a primary reflector 2, a secondary reflector 3 and a windshield 4. The light-emitting end of the image generation unit 1 is arranged toward the primary reflector 2 and is located between the primary reflector 2 and the secondary reflector 3. The secondary reflector 3 includes a first layer structure 5 and a second layer structure 6 that are overlapped. A first type polarized reflective film 7 is provided on the surface of the first layer structure 5 facing the primary reflector 2, and a second type polarized reflective film 8 is provided on the surface of the second layer structure 6 facing the first layer structure 5. The windshield 4 is located above the secondary reflector 3, and the first type polarized reflective film 7 faces the windshield 4.
[0035] It should be noted here that: by adopting the double reflection method of the primary reflector 2 and the secondary reflector 3 to fold the light path, the straight-line distance of the light path is reduced, thereby solving the problem of insufficient space in front of the steering wheel of the vehicle; the secondary reflector 3 adopts two overlapping first-layer structures 5 and second-layer structures 6, and a first-type polarized reflective film 7 is set on the first-layer structure 5, and the light polarized in a certain direction is reflected through the windshield 4 to form an image of a focal plane, and a second-type polarized reflective film 8 is set on the second-layer structure 6, and the light polarized in another direction is reflected through the windshield 4 to form an image of another focal plane. The design of the two polarized reflective films realizes a dual-focal-plane HUD system, without the need to design two sets of optical systems, and the dual-focal-plane effect can be achieved with a smaller volume.
[0036] Since there is not much space in the car to install the head-up display system, it is necessary to extend the object distance as much as possible within the limited space to increase the image distance and magnification. Therefore, it is necessary to use a reflective structure to fold the light path and reduce the overall volume. Therefore, the light path is folded by using a primary reflector 2 and a secondary reflector 3 for two reflections to reduce the straight-line distance of the light path.
[0037] The image generation unit 1 adopts a PGU (Picture Generation Unit) that outputs non-polarized images.
[0038] The reflection direction of the first type polarizing reflective film 7 and the reflection direction of the second type polarizing reflective film 8 are arranged to be orthogonal to each other.
[0039] It should be noted here that: with the orthogonal design, when light hits the first type polarizing reflective film 7, the light polarized in a certain direction is reflected to form an image of a focal plane, while the light in the orthogonal direction passes through the first layer structure 5 and hits the second type polarizing reflective film 8, which is reflected to form an image of another focal plane.
[0040] The first type polarizing reflective film 7 is disposed on the surface of the first structure 5 facing the primary reflector 2 by vacuum coating, and the second type polarizing reflective film 8 is disposed on the surface of the second structure 6 facing the first structure 5 by vacuum coating.
[0041] It should be noted here that: the first type polarizing reflective film 7 covers the entire surface of the first layer structure 5 facing the primary reflector 2, and the second type polarizing reflective film 8 covers the entire surface of the second layer structure 6 facing the first layer structure 5. The use of vacuum coating can form a stronger bond between the coating and the substrate, thereby improving the durability and service life of the reflective film. In addition, the vacuum-plated reflective film has good uniformity, ensuring that the optical performance of the reflective film is more stable and reliable.
[0042] The first layer structure 5 and the second layer structure 6 are glued together.
[0043] It should be noted here that the gluing connection can make the first layer structure 5 and the second layer structure 6 form a whole, improve the structural stability of the entire optical system, reduce vibration and reflection losses, and effectively prevent impurities such as dust and moisture from entering between the first layer structure 5 and the second layer structure 6, thereby protecting the optical surface and extending the service life. In addition, the gluing connection is usually lighter than the mechanical fixing method, which is conducive to the lightweight design of the entire optical system.
[0044] The first layer structure 5 and the second layer structure 6 are both free-form surface mirrors.
[0045] It should be noted here that both the first layer structure 5 and the second layer structure 6 adopt free-form surface mirrors, which can realize complex optical functions and play a role in correcting aberrations.
[0046] The primary reflection mirror 2 is a plane mirror.
[0047] It should be noted here that: the plane mirror is simple to manufacture, and the light path does not change after reflection, which facilitates light path design.
[0048] The primary reflection mirror 2 is a free-form surface mirror.
[0049] It should be noted here that the primary reflection mirror 2 adopts a free-form surface mirror, which can realize complex optical functions and play a role in correcting aberrations.
[0050] A vehicle comprises a dual-focal-plane HUD system coated with a polarization-selective reflective film as described in any one of the above items.
[0051] The principle of the dual-focal plane HUD system of this utility model is as follows Figures 3 and 4 As shown, light from different fields of view emerges from image generation unit 1 and strikes primary reflector 2. After being reflected by primary reflector 2, it strikes first structure 5. A first-type polarizing reflective film 7 reflects light of a certain polarization direction, and then forms a virtual image for the human eye at the first focal plane through windshield 4. Meanwhile, light polarized in an orthogonal direction penetrates first structure 5 and strikes second structure 6. After being reflected by second-type polarizing reflective film 8, it forms a virtual image for the human eye at the second focal plane through windshield 4. Optical parameters such as the positions of the two focal planes and the virtual image magnification can be customized by designing the surface profiles of first and second polarizing reflective films 7 and 8. This eliminates the need for designing two optical systems to achieve a dual-focal-plane HUD system, allowing for a more compact design.
[0052] In summary, the beneficial effects of the present invention are:
[0053] (1) By adopting the method of double reflection by the primary reflector 2 and the secondary reflector 3, the optical path is folded to reduce the straight-line distance of the optical path, thereby solving the problem of insufficient space in front of the steering wheel of the vehicle;
[0054] (2) The secondary reflector 3 adopts two overlapping first-layer structures 5 and second-layer structures 6, and a first-type polarized reflective film 7 is set on the first-layer structure 5 to reflect light polarized in a certain direction through the windshield 4 to form an image of a focal plane. A second-type polarized reflective film 8 is set on the second-layer structure 6 to reflect light polarized in another direction through the windshield 4 to form an image of another focal plane. The design of the two polarized reflective films realizes a dual-focal-plane HUD system without designing two sets of optical systems, and the dual-focal-plane effect can be achieved with a smaller volume.
[0055] The various devices selected in this application are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.
[0056] In the description of the embodiments of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.
[0057] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0058] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.
Claims
1. A dual-focal-plane HUD system coated with a polarization-selective reflective film, characterized in that: include: An image generation unit (1), a primary reflector (2), a secondary reflector (3) and a windshield (4); the light-emitting end of the image generation unit (1) is arranged toward the primary reflector (2) and is located between the primary reflector (2) and the secondary reflector (3); the secondary reflector (3) comprises a first layer structure (5) and a second layer structure (6) that are overlapped; a first type polarized reflective film (7) is provided on the surface of the first layer structure (5) facing the primary reflector (2); a second type polarized reflective film (8) is provided on the surface of the second layer structure (6) facing the first layer structure (5); the windshield (4) is located above the secondary reflector (3), and the first type polarized reflective film (7) faces the windshield (4).
2. The dual-focal-plane HUD system coated with a polarization-selective reflective film as claimed in claim 1, wherein: The reflection direction of the first type polarizing reflection film (7) and the reflection direction of the second type polarizing reflection film (8) are arranged to be orthogonal to each other.
3. The dual-focal-plane HUD system coated with a polarization-selective reflective film as claimed in claim 1, wherein: The first-type polarized reflective film (7) is arranged on the surface of the first layer structure (5) facing the primary reflector (2) by vacuum coating, and the second-type polarized reflective film (8) is arranged on the surface of the second layer structure (6) facing the first layer structure (5) by vacuum coating.
4. The dual-focal-plane HUD system coated with a polarization-selective reflective film as claimed in claim 1, wherein: The first layer structure (5) and the second layer structure (6) are glued together.
5. The dual-focal-plane HUD system coated with a polarization-selective reflective film as claimed in claim 1, wherein: The first layer structure (5) and the second layer structure (6) are both free-form surface mirrors.
6. The dual-focal-plane HUD system coated with a polarization-selective reflective film as claimed in claim 1, wherein: The primary reflection mirror (2) is a plane mirror.
7. The dual-focal-plane HUD system coated with a polarization-selective reflective film as claimed in claim 1, wherein: The primary reflection mirror (2) is a free-form surface mirror.
8. A vehicle, characterized in that: The invention comprises a dual-focal-plane HUD system coated with a polarization-selective reflective film as described in any one of claims 1 to 7.