High-reflection aluminum film and head-up display system

Abstract

The utility model discloses a high-reflection aluminum film and a head-up display system. The high-reflection aluminum film comprises a SiO2 layer, an Al layer, a NiCr layer, a hardening coating, a base material layer and a bonding layer which are sequentially stacked. The high-reflection aluminum film can be bonded on the reflector main body through the bonding layer, the traditional coating process is replaced, and the damage of the coating process to the reflector main body is reduced. The high-reflection aluminum film is excellent in bending performance, can meet the reflection requirements of reflection surfaces with different radians and shapes, and has the advantages of being high in reflectivity, excellent in ring measurement resistance and stable in performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of head-up display systems, and in particular relates to a high-reflective aluminum film and a head-up display system. Background Art

[0002] In recent years, the new energy vehicle market has flourished, with sales of new energy vehicles from major automakers soaring. Intelligent features have become a core selling point for these models, with head-up display (HUD) technology, in particular, becoming a key focus for OEMs and beginning to be widely adopted in mass-produced models.

[0003] A heads-up display (HUD), also known as a head-up display system, is a driver-centric, blind-operated, multi-functional instrument panel. Its function is to project important driving information, such as speed and navigation, onto the windshield in front of the driver, allowing the driver to see these information without looking down or turning their head. This reduces the time the driver takes their eyes off the road, improving driving safety.

[0004] Most current head-up display systems use reflectors (free-form mirrors), prisms, and beam splitters to achieve light reflection. These reflectors are typically coated on the reflector body (made of materials such as engineering resin and glass). This coating process is complex and expensive. The reflector body requires complex molds and a complex structure that is prone to damage. This can lead to surface deformation and aging during subsequent use, impacting image quality and accuracy.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0006] The purpose of the utility model is to provide a highly reflective aluminum film and a head-up display system, which can be bonded to a reflector body to achieve a light reflection effect, replacing the process of coating the reflector body, reducing costs, and avoiding damage to the reflector body caused by coating.

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by a specific embodiment of the present invention is as follows: a highly reflective aluminum film, which acts in a head-up display system to reflect light onto the windshield, and the highly reflective aluminum film includes a SiO2 layer, an Al layer, a NiCr layer, a hard coating layer, a substrate layer and an adhesive layer stacked in sequence.

[0008] In one or more embodiments of the present invention, the thickness of the SiO2 layer is 5 to 15 nm.

[0009] In one or more embodiments of the present invention, the thickness of the Al layer is 40-80 nm.

[0010] In one or more embodiments of the present invention, the thickness of the NiCr layer is 2-6 nm.

[0011] In one or more embodiments of the present invention, the thickness of the hard coating layer is 3 to 5 μm.

[0012] In one or more embodiments of the present invention, the substrate layer is a PET substrate layer.

[0013] In one or more embodiments of the present invention, the thickness of the PET substrate layer is 50 to 188 μm.

[0014] In one or more embodiments of the present invention, the bonding layer is an OCA bonding layer.

[0015] In one or more embodiments of the present invention, the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 380 to 780 nm is greater than or equal to 88.5%; the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 400 to 700 nm is greater than or equal to 88.9%.

[0016] A specific embodiment of the present invention further provides a head-up display system for projecting driving information onto a windshield. The head-up display system includes:

[0017] An image source, for emitting light;

[0018] The optical path component comprises a reflector body and the above-mentioned high-reflection aluminum film, wherein the high-reflection aluminum film is adhered to the reflector body.

[0019] Compared with the existing technology, the high-reflective aluminum film of the present invention achieves the effect of light reflection by bonding it to the reflector body in the head-up display system, avoiding the problems of high cost, complex coating process, easy damage of the reflective film on the reflector body in the traditional technology, and easy deformation and aging of the mirror surface during subsequent use, which affects the image effect and accuracy. In addition, the high reflectivity effect is achieved through the selection and design of the various layer structures of the high-reflective aluminum film. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a highly reflective aluminum film in an example of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure and principle of a head-up display system in an example of the present invention;

[0023] Figure 3 This is a schematic structural diagram of a highly reflective aluminum film in an example of the present invention;

[0024] Figure 4 This is a reflectivity curve diagram of the highly reflective aluminum film in Example 1 of the present utility model;

[0025] Figure 5 This is a reflectivity curve diagram of the highly reflective aluminum film in Example 2 of the present utility model;

[0026] Figure 6 This is a reflectivity curve diagram of the highly reflective aluminum film in Example 3 of the present utility model;

[0027] Figure 7 This is a reflectivity curve diagram of the high-reflective aluminum film in Example 4 of the present utility model.

[0028] Description of main reference numerals:

[0029] 1. SiO2 layer; 2. Al layer; 3. NiCr layer; 4. Hard coating layer; 5. Base material layer; 6. Adhesive layer; 7. Release layer; 8. Image source; 9. Optical path component; 91. Reflector body; 911. Adjustable free-form mirror; 912. Non-adjustable free-form mirror; a. Windshield. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of 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 should fall within the scope of protection of the present invention.

[0031] As mentioned in the background technology, in the vehicle-mounted HUD system, the existing technology uses a coating process to coat the reflector body. However, the coating process is relatively complicated and the structure of the reflector body itself may be damaged during the coating process. In addition, the reflector body after coating is prone to deformation and aging during subsequent use, affecting the image effect and accuracy.

[0032] To solve the above problems, Figure 1 and 2 As shown, the head-up display system in one example of the present invention includes an optical path component 9 and an image source 8; the optical path component 9 includes a highly reflective aluminum film and a reflector body 91, the highly reflective aluminum film is bonded to the reflector body 91, and the highly reflective aluminum film includes a SiO2 layer 1, an Al layer 2, a NiCr layer 3, a hard coating layer 4, a substrate layer 5 and an adhesive layer 6 stacked in sequence.

[0033] It can be understood that the working principle of the head-up display system shown in Figure 2 is as follows: the driving information is emitted to the reflector body 91 via the image source 8 in the form of a light signal, and is projected onto the windshield a (in the car) after being reflected by the reflector body 91. The driving information may include speed information, navigation information, etc. In this example, the reflector body 91 may include an adjustable free-form mirror 911 and a non-adjustable free-form mirror 912, and a highly reflective aluminum film may be bonded to the adjustable free-form mirror 911 and / or the non-adjustable free-form mirror 912. The adjustable free-form mirror 911 refers to a mirror whose position and angle can be adjusted, thereby adjusting the reflection position and angle of the light; the non-adjustable free-form mirror 912 refers to a mirror whose position and angle cannot be adjusted.

[0034] In other examples, the reflector body 91 may be merely a carrier (i.e., a non-reflector optical device, such as an ordinary metal plate, wooden board, or other structure, as long as it can be bonded to the highly reflective aluminum film), and the highly reflective aluminum film serves to reflect the light emitted by the image source 8.

[0035] The high-reflective aluminum film of the present invention can be bonded to the reflector body via the adhesive layer 6, replacing the traditional coating process and reducing the damage to the reflector body caused by the coating process. The high-reflective aluminum film of the present invention has excellent bending performance and can meet the reflection requirements of reflective surfaces of different curvatures and shapes. In addition, the high-reflective aluminum film of the present invention has the advantages of high reflectivity, excellent environmental resistance, and stable performance.

[0036] It should be noted that the material of the SiO2 layer 1 is silicon dioxide, the material of the Al layer 2 is aluminum alone, and the material of the NiCr layer 3 is nickel-chromium alloy.

[0037] The raw material of the hard coating layer 4 may be CHT-X1 of HC Hard-Coating, and the hard coating layer 4 is formed by a wet coating process of CHT-X1 of HC Hard-Coating.

[0038] Preferably, the SiO2 layer 1 has a thickness of 5 to 15 nm, wherein the SiO2 layer 1 can protect the Al layer 2 from oxidation of the aluminum in the Al layer 2. The Al layer 2 has a thickness of 40 to 80 nm. The NiCr layer 3 has a thickness of 2 to 6 nm. The hard coating layer 4 has a thickness of 3 to 5 μm.

[0039] It is understandable that the selection of the thickness of each layer structure will also affect the reflectivity of the entire high-reflective aluminum film.

[0040] Preferably, the substrate layer 5 is a PET substrate layer 5. Preferably, the thickness of the PET substrate layer 5 is 50 to 188 μm.

[0041] Preferably, the adhesive layer 6 is an OCA adhesive layer 6. The material of the OCA adhesive layer 6 is OCA optical transparent adhesive, which is commonly sold in the market and serves to bond the high-reflective aluminum film to the reflector body.

[0042] Preferably, the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 380 to 780 nm is greater than or equal to 88.5%; the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 400 to 700 nm is greater than or equal to 88.9%.

[0043] like Figure 3 As shown, the highly reflective aluminum film further comprises a release layer 7 laminated on the adhesive layer 6 and disposed on a side facing away from the substrate layer 5. The release layer 7 can be a conventionally sold release film, which is mainly used to facilitate the storage of the highly reflective aluminum film.

[0044] The high-reflective aluminum film and head-up display system of the present invention will be described in detail below with reference to specific embodiments.

[0045] Example 1

[0046] Polyethylene terephthalate (PET) is used as the substrate layer, and the thickness of the substrate layer is selected to be 125μm. A hard coating layer, a NiCr layer, an Al layer, and a SiO2 layer are sequentially plated on the substrate layer using a magnetron sputtering process. The thickness of the hard coating layer is 3μm, the thickness of the NiCr layer is 4nm, the thickness of the Al layer is 40nm, and the thickness of the SiO2 layer is 10nm. An OCA bonding layer is formed on the other side of the substrate layer to obtain the following: Figure 1 Highly reflective aluminum film shown.

[0047] Through Figure 4 From the reflectivity curve shown, it can be seen that the average reflectivity of the high-reflective aluminum film of this embodiment to the incident light with a wavelength of 380-780nm is 90.2%; the average reflectivity of the high-reflective aluminum film to the incident light with a wavelength of 400-700nm is 90.6%.

[0048] Example 2

[0049] Polyethylene terephthalate (PET) is used as the substrate layer, and the thickness of the substrate layer is selected to be 125μm. A hard coating layer, a NiCr layer, an Al layer, and a SiO2 layer are sequentially plated on the substrate layer using a magnetron sputtering process. The thickness of the hard coating layer is 3μm, the thickness of the NiCr layer is 4nm, the thickness of the Al layer is 60nm, and the thickness of the SiO2 layer is 10nm. An OCA bonding layer is formed on the other side of the substrate layer to obtain the following: Figure 1 Highly reflective aluminum film shown.

[0050] Through Figure 5 From the reflectivity curve shown, it can be seen that the average reflectivity of the high-reflective aluminum film of this embodiment to the incident light with a wavelength of 380-780nm is 91%; the average reflectivity of the high-reflective aluminum film to the incident light with a wavelength of 400-700nm is 91.2%.

[0051] Example 3

[0052] Polyethylene terephthalate (PET) is used as the substrate layer, and the thickness of the substrate layer is selected to be 125μm. A hard coating layer, a NiCr layer, an Al layer, and a SiO2 layer are sequentially plated on the substrate layer using a magnetron sputtering process. The thickness of the hard coating layer is 3μm, the thickness of the NiCr layer is 4nm, the thickness of the Al layer is 80nm, and the thickness of the SiO2 layer is 10nm. An OCA bonding layer is formed on the other side of the substrate layer to obtain the following: Figure 1 Highly reflective aluminum film shown.

[0053] Through Figure 6 From the reflectivity curve shown, it can be seen that the average reflectivity of the high-reflective aluminum film of this embodiment to the incident light with a wavelength of 380-780nm is 91.5%; the average reflectivity of the high-reflective aluminum film to the incident light with a wavelength of 400-700nm is 91.7%.

[0054] Example 4

[0055] Polyethylene terephthalate (PET) is used as the substrate layer, and the thickness of the substrate layer is selected to be 125μm. A hard coating layer, a NiCr layer, an Al layer, and a SiO2 layer are sequentially plated on the substrate layer using a magnetron sputtering process. The thickness of the hard coating layer is 3μm, the thickness of the NiCr layer is 4nm, the thickness of the Al layer is 30nm, and the thickness of the SiO2 layer is 10nm. An OCA bonding layer is formed on the other side of the substrate layer to obtain the following: Figure 1 Highly reflective aluminum film shown.

[0056] Through Figure 7 From the reflectivity curve shown, it can be seen that the average reflectivity of the high-reflective aluminum film of this embodiment to the incident light with a wavelength of 380-780nm is greater than or equal to 88.5%; the average reflectivity of the high-reflective aluminum film to the incident light with a wavelength of 400-700nm is greater than or equal to 88.9%.

[0057] It can be seen from Examples 1 to 4 that, when other layers remain unchanged, the thickness of the Al layer affects the reflectivity of the entire film. When the thickness of the Al layer is 30 to 80 nm, the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 380 to 780 nm is 88.5%; the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 400 to 700 nm is 88.9%.

[0058] It can be seen from Examples 1 to 3 that, when other layers remain unchanged, the thickness of the Al layer affects the reflectivity of the entire film. When the thickness of the Al layer is 40 to 80 nm, the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 380 to 780 nm is 90.2%; the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 400 to 700 nm is 90.6%.

[0059] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0060] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A highly reflective aluminum film, used in a head-up display system to reflect light onto the windshield, characterized in that: The high-reflection aluminum film includes a SiO2 layer, an Al layer, a NiCr layer, a hard coating layer, a substrate layer and a bonding layer which are stacked in sequence.

2. The highly reflective aluminum film according to claim 1, wherein The thickness of the SiO2 layer is 5 to 15 nm.

3. The highly reflective aluminum film according to claim 1, wherein: The thickness of the Al layer is 40-80 nm.

4. The highly reflective aluminum film according to claim 1, wherein: The thickness of the NiCr layer is 2-6 nm.

5. The highly reflective aluminum film according to claim 1, wherein: The thickness of the hard coating is 3 to 5 μm.

6. The highly reflective aluminum film according to claim 1, wherein: The substrate layer is a PET substrate layer.

7. The highly reflective aluminum film according to claim 6, characterized in that: The thickness of the PET substrate layer is 50 to 188 μm.

8. The highly reflective aluminum film according to claim 1, wherein: The bonding layer is an OCA bonding layer.

9. The highly reflective aluminum film according to claim 1, wherein: The average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 380 to 780 nm is greater than or equal to 88.5%; the average reflectivity of the highly reflective aluminum film to incident light with a wavelength of 400 to 700 nm is greater than or equal to 88.9%.

10. A head-up display system for projecting driving information onto the windshield, characterized in that: The head-up display system includes: An image source, for emitting light; An optical path component comprises a reflector body and the highly reflective aluminum film according to any one of claims 1 to 9, wherein the highly reflective aluminum film is adhered to the reflector body.

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