License plate reflective film

Abstract

The license plate reflective film comprises a reflective layer and a silk-screen printing layer, the silk-screen printing layer is composed of conductive silver paste which is printed on the reflective layer in a silk-screen mode, the conductive silver paste forms a circuit structure on the reflective layer, and the storage and transmission functions of license plate information are achieved through the circuit structure. The license plate using the reflective film can still maintain good data transmission performance in various complex environments. In addition, the circuit structure is directly formed on the reflecting layer through silk-screen printing, and a traditional chip does not need to be embedded, so that the overall thickness of the reflecting film is not increased, the attractiveness of the license plate is kept, and the manufacturing cost is effectively reduced. The utility model further discloses a license plate comprising the license plate reflective film.

Description

TECHNICAL FIELD

[0001] The utility model relates to a license plate reflective film, in particular to a license plate reflective film and license plate which can be identified by millimeter wave. BACKGROUND

[0002] At present, the recognition of license plate mainly depends on the continuous shooting of license plate image by high-definition camera, and the license plate recognition is carried out through computer vision and image processing technology. This method is widely used in the fields of traffic monitoring, automatic charging and parking management. However, in some specific cases, the license plate image captured by the camera may be affected by external factors, resulting in the failure to correctly identify the license plate information. For example, the factors such as dirty, reflective or artificial shielding on the surface of the license plate may cause the quality of the license plate image to decrease, thereby affecting the accuracy and stability of the identification system.

[0003] In order to solve this problem, the related technology realizes the storage and wireless transmission of license plate information by integrating a chip in the license plate, thereby assisting the identification system to improve the identification efficiency and accuracy. However, the embedding of the chip requires additional structural space, which often leads to an increase in the thickness of the license plate, affecting the appearance and use of the license plate, and may also cause the rise of production cost and the difficulty of standardized application. SUMMARY

[0004] Therefore, the purpose of the utility model is to provide a license plate reflective film which has thinner overall thickness while meeting the transmission performance.

[0005] The utility model provides a license plate reflective film, including reflection layer and silk screen printing layer, the silk screen printing layer is by the conductive silver paste of silk screen printing on the reflection layer is formed, the conductive silver paste forms circuit structure on the reflection layer.

[0006] In an embodiment, the license plate reflective film further comprises a face film layer, a bead implantation layer and a focal point layer arranged in sequence, the reflection layer is close to one side of the silk screen printing layer, and the face film layer is away from one side of the pressure sensitive adhesive layer.

[0007] In an embodiment, the license plate reflective film further comprises an information printing layer and a bonding layer, and the information printing layer is attached to the surface of the face film layer through the bonding layer.

[0008] In an embodiment, the thickness of the information printing layer is 50-200 microns, the bonding layer is UV glue, the transmittance of the bonding layer is greater than 90%, and the thickness of the bonding layer is 5-20 microns.

[0009] In an embodiment, the license plate reflective film further comprises a pressure sensitive adhesive layer and a release layer, and the reflection layer is attached to the surface of the release layer through the pressure sensitive adhesive layer.

[0010] In an embodiment, the reflective layer is a metal material, which is any one of aluminum, silver, titanium, chromium, copper, nickel or indium-tin alloy.

[0011] In an embodiment, the reflective layer is a dielectric material, which comprises at least one first dielectric layer and at least one second dielectric layer, the first dielectric layer and the second dielectric layer are alternately stacked, the refractive index of the first dielectric layer is 0.05-2 larger than that of the second dielectric layer.

[0012] The first dielectric layer is a zinc sulfide dielectric layer or a titanium dioxide dielectric layer, and the second dielectric layer is a magnesium fluoride dielectric layer or a PMMA dielectric layer.

[0013] In an embodiment, the film layer is an acrylic glue layer, and the thickness is 20-40 μm.

[0014] In an embodiment, the bead layer is a semi-implanted glass bead in acrylic glue, the thickness of the bead layer is 20-80 μm, the glass bead is 200-500 mesh, and the refractive index of the glass bead is 1.9 or 2.2.

[0015] The utility model also provides a license plate comprising the license plate reflective film above.

[0016] The license plate reflective film provided by the utility model forms a circuit structure directly on the reflective film, realizes the storage and transmission functions of license plate information, and the license plate using the reflective film can still maintain good data transmission performance in various complex environments, for example, in the case that the surface of the license plate is polluted, reflects light or is partially blocked, the license plate information can still be reliably transmitted to a license plate recognition device. In addition, since the circuit structure is directly formed on the reflective layer by silk screen printing, it is not necessary to embed a traditional chip, so the overall thickness of the reflective film is not increased, the appearance of the license plate is maintained, and the manufacturing cost is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 The structure schematic view of the license plate reflective film provided by the preferred embodiment of the utility model.

[0019] Figure 2 The structure schematic view of the reflective layer provided by the preferred embodiment of the utility model.

[0020] Figure 3 A schematic diagram of the circuit structure provided for a preferred embodiment of this utility model.

[0021] Figure label:

[0022] 1. Information printing layer; 2. Adhesive layer; 3. Mask layer; 4. Bead layer; 5. Focal point layer; 6. Reflective layer; 7. Screen printing layer; 8. Pressure-sensitive adhesive layer; 9. Release layer; 61. First dielectric layer; 62. Second dielectric layer. Detailed Implementation

[0023] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0027] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0028] This application relates to a license plate recognition device, which includes a millimeter-wave radar for transmitting millimeter waves and communicating with a chip inside the license plate to obtain license plate information.

[0029] Please refer toFigures 1 to 2 This invention provides a license plate reflective film comprising a reflective layer 6 and a screen-printed layer 7. The screen-printed layer 7 is a circuit structure formed directly on the reflective layer 6 using conductive silver paste through a screen printing process. This circuit structure stores license plate information and functions as a chip. Upon receiving millimeter waves emitted by a license plate recognition device, the circuit structure formed by the screen-printed layer 7 encodes and modulates the stored license plate information onto the returning millimeter waves, ultimately feeding back to the license plate recognition device. With this configuration, license plates using this reflective film can maintain good data transmission performance in various complex environments, such as when the license plate surface is contaminated, reflective, or partially obscured, it can still reliably transmit license plate information to the license plate recognition device. Furthermore, since the circuit structure is formed directly on the reflective layer 6 through screen printing, there is no need to embed a traditional chip, thus not increasing the overall thickness of the reflective film. This not only maintains the aesthetics and standardized design of the license plate but also effectively reduces manufacturing costs while improving the practicality and functionality of the license plate.

[0030] In this embodiment, the license plate reflective film further includes a face film layer 3, a beaded layer 4, and a focal layer 5 arranged sequentially. The screen-printed layer 7 is located on the side closer to the focal layer 5, and the face film layer 3 is located on the side farther from the pressure-sensitive adhesive layer 8. The face film layer 3 is made of acrylic acid with a thickness of 20μm-40μm, possessing good flexibility and transparency, effectively protecting the beaded layer 4. The reflective layer 6 is mainly used to reflect light illuminating the license plate, while the focal layer 5 is used to adjust the propagation path of the reflected light, making it more focused and ensuring high visibility of the license plate under low-light conditions.

[0031] Preferably, the license plate reflective film further includes an information printing layer 1, which is adhered to the surface of the film layer 3 via an adhesive layer 2. The information printing layer 1 is made of aging-resistant PVC material with a thickness of 50μm-200μm. License plate identification information, such as vehicle number and related patterns, is printed on the surface of the information printing layer 1. The aging-resistant PVC material has excellent UV resistance and weather resistance, effectively resisting aging phenomena caused by long-term exposure to harsh environments such as sunlight, rain, and high temperatures, thereby extending the service life of the license plate. Specifically, the adhesive layer 2 is a UV adhesive with a thickness of 5μm-20μm and a transmittance greater than 90%, effectively ensuring the transmission of light and signal waves and avoiding affecting the performance of other functional layers within the reflective film.

[0032] Furthermore, the license plate reflective film also includes a pressure-sensitive adhesive layer 8 and a release layer 9. Release layer 9 comprises a substrate layer and a release coating. The substrate layer of release layer 9 is made of a high-strength and flexible paper or film material, such as silicone paper, PET film, or other tear-resistant materials, to provide sufficient mechanical strength to prevent breakage or deformation during peeling. The release coating is a specially treated low surface energy material (such as a silicone coating or fluoride coating) that prevents permanent adhesion between the pressure-sensitive adhesive layer 8 and the release layer 9, while allowing for easy peeling when needed. During the bonding process, the pressure-sensitive adhesive layer 8 adheres tightly to the surface of the release coating to protect the pressure-sensitive adhesive from contamination or damage. When the reflective film needs to be installed, the user simply peels off the release layer 9, exposing the pressure-sensitive adhesive layer 8, which then adheres directly to the target surface (such as the license plate substrate) with its excellent adhesion properties.

[0033] Specifically, pressure-sensitive adhesive layer 8 is an acrylic pressure-sensitive adhesive with a thickness of 30μm-80μm. Acrylic pressure-sensitive adhesive not only has excellent bonding properties but also maintains stable adhesion under different temperature and humidity conditions, thereby improving the environmental adaptability of license plates.

[0034] In this embodiment, the reflective layer 6 is made of a metallic material, such as aluminum, silver, titanium, chromium, copper, nickel, or an indium tin alloy. These metallic materials all possess high reflectivity, effectively enhancing reflective performance. It is worth noting that since the circuit structure formed by the screen-printed layer 7 is located on the surface of the reflective layer 6, even if the reflective layer 6 uses a metal layer that shields signals, such as aluminum, it will not affect the use of the license plate reflective film.

[0035] like Figure 2 As shown, in one embodiment, the reflective layer 6 includes at least one first dielectric layer 61 and at least one second dielectric layer 62, wherein the first dielectric layer 61 and the second dielectric layer 62 are alternately stacked, and the refractive index of the first dielectric layer 61 is 0.05~2 greater than the refractive index of the second dielectric layer 62.

[0036] Specifically, the first dielectric layer 61 is a zinc sulfide dielectric layer or a titanium dioxide dielectric layer, which have high refractive indices. The second dielectric layer 62 is a magnesium fluoride dielectric layer or a PMMA dielectric layer, which have low refractive indices. The two layers produce a high refractive index difference, thus resulting in excellent reflective properties.

[0037] Preferably, the bead layer 4 is made of semi-embedded glass microspheres in acrylic adhesive, the thickness of the bead layer 4 is 20μm-80μm, the glass microspheres are 200 mesh-500 mesh, and the refractive index of the glass microspheres is 1.9 or 2.2, so that they can be stably fixed. At the same time, the exposed part of the glass microspheres can effectively reflect light under illumination, enhancing the visibility and recognition effect of the license plate.

[0038] This utility model embodiment also provides a license plate, including the above-mentioned license plate reflective film.

[0039] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A license plate reflective film, characterized by, The license plate reflective film comprises a reflective layer (6) and a screen printing layer (7) formed by screen printing conductive silver paste on the reflective layer (6), the conductive silver paste forming a circuit structure on the reflective layer (6).

2. The license plate reflective film of claim 1, wherein, The license plate reflective film further comprises a surface film layer (3), a bead layer (4) and a focal point layer (5) arranged in sequence, the reflective layer (6) being close to the screen printing layer (7), and the surface film layer (3) being away from the pressure-sensitive adhesive layer (8).

3. The license plate reflective film of claim 2, wherein, The license plate reflective film further comprises an information printing layer (1) and a bonding layer (2), the information printing layer (1) being attached to the surface of the surface film layer (3) through the bonding layer (2).

4. The license plate reflective film of claim 3, wherein, The thickness of the information printing layer (1) is 50-200 μm, the bonding layer (2) is UV glue, the transmittance of the bonding layer (2) is greater than 90%, and the thickness of the bonding layer (2) is 5-20 μm.

5. The license plate reflective film of claim 1, wherein, The license plate reflective film further comprises a pressure-sensitive adhesive layer (8) and a release layer (9), the reflective layer (6) being attached to the surface of the release layer (9) through the pressure-sensitive adhesive layer (8).

6. The license plate reflective film of claim 1, wherein, The reflective layer (6) is a metal material, and the metal material is any one of aluminum, silver, titanium, chromium, copper, nickel or indium-tin alloy.

7. The license plate reflective film of claim 1 wherein, The reflective layer (6) is a dielectric material, comprising at least one first dielectric layer (61) and at least one second dielectric layer (62), the first dielectric layer (61) and the second dielectric layer (62) being arranged alternately and superimposed, the refractive index of the first dielectric layer (61) being greater than that of the second dielectric layer (62) by 0.05-2. The first dielectric layer (61) is a zinc sulfide dielectric layer or a titanium dioxide dielectric layer, and the second dielectric layer (62) is a magnesium fluoride dielectric layer or a PMMA dielectric layer.

8. The license plate reflective film of claim 2, wherein, The surface film layer (3) is an acrylic adhesive layer, and the thickness of the surface film layer (3) is 20-40 μm.

9. The license plate reflective film of claim 2, wherein, The bead layer (4) is a semi-implanted glass bead in acrylic glue, the thickness of the bead layer (4) is 20-80 μm, the glass bead is 200-500 mesh, and the refractive index of the glass bead is 1.9 or 2.

2.

10. A license plate, characterized in that The license plate reflective film comprises the license plate reflective film according to any one of claims 1-9.

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