UV photochromic cover plate

Abstract

The utility model discloses a UV photochromic cover plate which comprises a transparent cover plate. The UV photochromic layer is arranged on the lower surface of the transparent cover plate; the UV reflection filter layer is arranged on the lower surface of the UV photochromic layer; and the primary color ink layer is arranged on the lower surface of the UV reflection filter layer. According to the UV photochromic cover plate, the light ray utilization rate of UV light can be improved, and the color changing effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic accessories, and in particular to a UV light color-changing cover. Background Technology

[0002] Electronic products such as mobile phones, tablets, cameras, and laptops generally include cover plates to protect the product or enhance its appearance. Currently, the appearance, color, and performance of cover plates on the market are relatively limited, and the color is irreversible; once formed, the color cannot be changed.

[0003] To address the aforementioned technical issues, Chinese Patent Application No. CN201920992056.8 discloses a flexible display screen, comprising a display module and a cover plate covering the display module. A photosensitive color-changing ink layer and a base color ink layer are sequentially stacked on the edge of the cover plate facing the display module. Because the photosensitive color-changing ink layer and the base color ink layer are sequentially stacked on the edge of the cover plate facing the display module, this flexible display screen can change its color in response to changes in ambient light, providing users with a better user experience.

[0004] However, when UV light shines on the photosensitive color-changing ink layer, some of it will pass through the photosensitive color-changing ink layer and be absorbed by the base color ink layer, resulting in low light utilization and affecting the color-changing effect of the photosensitive color-changing ink layer. Utility Model Content

[0005] To address the shortcomings of the existing technology, this invention provides a UV light color-changing cover plate, which can improve the utilization rate of UV light and enhance the color-changing effect.

[0006] The technical problem to be solved by this utility model is achieved through the following technical solution:

[0007] A UV-sensitive color-changing cover, comprising:

[0008] Transparent cover;

[0009] A UV photosensitive color-changing layer is disposed on the lower surface of the transparent cover plate;

[0010] A UV reflective filter layer is disposed on the lower surface of the UV photosensitive color-changing layer;

[0011] A base color ink layer is disposed on the lower surface of the UV reflective filter layer.

[0012] Furthermore, the UV photosensitive color-changing layer is transparent when there is no UV light irradiation and opaque when there is UV light irradiation.

[0013] Furthermore, the thickness of the UV photosensitive color-changing layer is between 7-9 μm.

[0014] Furthermore, the thickness of the base color ink layer is between 5-15 μm.

[0015] Furthermore, the UV reflective filter layer includes several UV high refractive index film layers and several UV low refractive index film layers, which are alternately stacked.

[0016] Furthermore, the UV high refractive index film is a tantalum pentoxide film or a titanium dioxide film.

[0017] Furthermore, the thickness of the UV high refractive index film is between 20-40 nm.

[0018] Furthermore, the UV low refractive index film is a magnesium fluoride film or a silicon dioxide film.

[0019] Furthermore, the thickness of the UV low refractive index film is between 35-50 nm.

[0020] Furthermore, the transparent cover plate includes a visible area and a peripheral area, with the peripheral area surrounding the visible area; the UV photosensitive color-changing layer and the base color ink layer only cover the peripheral area of ​​the transparent cover plate, while avoiding the visible area of ​​the transparent cover plate.

[0021] This invention has the following beneficial effects: The UV photochromic cover plate of this invention has a UV reflective filter layer disposed between the UV photosensitive color-changing layer and the base color ink layer. This utilizes the narrow-band reflective filtering characteristic of the UV reflective filter layer to reflect UV light passing through the UV photosensitive color-changing layer, while allowing visible light to pass through. When exposed to UV light, the UV reflective filter layer improves light utilization by reflecting UV light, thus enhancing the color-changing effect of the UV photosensitive color-changing layer. When there is no UV light exposure, the UV reflective filter layer allows visible light to pass through, thereby not affecting the color effect of the base color ink layer. Attached Figure Description

[0022] Figure 1 A schematic diagram of the stacked structure of the UV color-changing cover plate provided by this utility model.

[0023] Figure 2 This is a schematic diagram of the stacked structure of the UV reflective filter layer in the UV color-changing cover plate provided by this utility model.

[0024] Figure 3 A schematic diagram of the stacking structure of another UV light-changing color-changing cover plate provided by this utility model.

[0025] Figure 4 for Figure 3 The diagram shows a planar structure of the UV-sensitive color-changing cover. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0028] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Example 1

[0031] like Figure 1 As shown, a UV-sensitive color-changing cover includes:

[0032] Transparent cover plate 1;

[0033] A UV photosensitive color-changing layer 2 is disposed on the lower surface of the transparent cover plate 1;

[0034] A UV reflective filter layer 3 is disposed on the lower surface of the UV photosensitive color-changing layer 2;

[0035] The base color ink layer 4 is disposed on the lower surface of the UV reflective filter layer 3.

[0036] The UV-sensitive color-changing cover plate of this invention has a UV reflective filter layer 3 disposed between the UV photosensitive color-changing layer 2 and the base color ink layer 4. Utilizing the narrow-band reflective filtering characteristic of the UV reflective filter layer 3, it reflects UV light passing through the UV photosensitive color-changing layer 2 while allowing visible light to pass through. When exposed to UV light, the UV reflective filter layer 3 improves light utilization by reflecting UV light, thus enhancing the color-changing effect of the UV photosensitive color-changing layer 2. When there is no UV light exposure, the UV reflective filter layer 3 allows visible light to pass through, thereby not affecting the color effect of the base color ink layer 4.

[0037] In this embodiment, the transparent cover plate 1 may be, but is not limited to, a glass cover plate, a plastic cover plate, or a sapphire cover plate, etc., and its thickness is between 0.5-2.0 mm; the UV photosensitive color-changing layer 2 may be, but is not limited to, a UV photosensitive color-changing ink, and its thickness is between 7-9 μm; the base color ink layer 4 may be, but is not limited to, a colored ink such as black ink, red ink, or blue ink, and its thickness is between 5-15 μm.

[0038] The UV photosensitive color-changing ink contains UV photochromic materials, which can undergo reversible color changes under UV light irradiation, such as changing from transparent to opaque. The UV photosensitive color-changing ink is composed of UV photosensitive pigment microcapsules and a binder. Its manufacturing method generally involves dissolving the UV photochromic pigment in a solvent to form miniaturized UV photosensitive pigment microcapsules, then adding a binder according to different applications, and finally forming a film on the transparent cover plate 1 using methods such as roller coating, spraying, or printing.

[0039] Preferably, the UV photosensitive color-changing layer 2 is transparent when there is no UV light and opaque when there is UV light, so that the UV photosensitive color-changing cover plate presents a color consistent with the base color ink layer 4 when there is no UV light, and presents a color consistent with the color changed by the UV photosensitive color-changing layer 2 when there is UV light, or presents a mixed color of the color changed by the UV photosensitive color-changing layer 2 and the base color ink layer 4.

[0040] Specifically, such as Figure 2 As shown, the UV reflective filter layer 3 includes a plurality of UV high refractive index film layers 31 and a plurality of UV low refractive index film layers 32, which are alternately stacked.

[0041] The UV reflective filter layer 3 is based on the interference and diffraction effects of light. It is formed by depositing a material with a high refractive index for UV light to form the UV high refractive index film layer 31 and a material with a low refractive index for UV light to form the UV low refractive index film layer 32. By alternately stacking the UV high refractive index film layer 31 and the UV low refractive index film layer 32, it has a high reflectivity for UV light and a low reflectivity or complete transmission for light of other wavelengths, including visible light.

[0042] In this embodiment, the UV high refractive index film 31 may be, but is not limited to, a tantalum pentoxide film or a titanium dioxide film, with a thickness between 20-40 nm; the UV low refractive index film 32 may be, but is not limited to, a magnesium fluoride film or a silicon dioxide film, with a thickness between 35-50 nm.

[0043] In order to obtain a better narrowband reflective filtering effect, the UV high refractive index film 31 and the UV low refractive index film 32 each need to be at least three layers. In this embodiment, the UV high refractive index film 31 and the UV low refractive index film 32 each have three layers.

[0044] Electronic products such as mobile phones generally include a front cover and a back cover. The front cover, because it needs to accommodate a display screen, has a dedicated viewing area, while the back cover, since it does not need to accommodate a display screen, does not have a viewing area. When the UV-sensitive color-changing cover is used as the back cover of an electronic product, such as... Figure 1 As shown, the UV photosensitive color-changing layer 2, the UV reflective filter layer 3, and the UV photosensitive color-changing layer 2 all cover the entire surface of the transparent cover plate 1.

[0045] When the UV-sensitive color-changing cover is used as the front cover of an electronic product, such as Figure 3 and 4 As shown, the transparent cover plate 1 includes a visible area 11 and an outer area 12, with the outer area 12 surrounding the visible area 11; the UV photosensitive color-changing layer 2 and the base color ink layer 4 only cover the outer area 12 of the transparent cover plate 1, while avoiding the visible area 11 of the transparent cover plate 1.

[0046] The UV reflective filter layer 3 can be the same as the UV photosensitive color-changing layer 2 and the UV reflective filter layer 3, covering only the outer area 12 of the transparent cover plate 1, or it can cover both the visible area 11 and the outer area 12 of the transparent cover plate 1.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present utility model, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the present utility model.

Claims

1. A UV-sensitive color-changing cover, characterized in that, include: Transparent cover; A UV photosensitive color-changing layer is disposed on the lower surface of the transparent cover plate; A UV reflective filter layer is disposed on the lower surface of the UV photosensitive color-changing layer; A base color ink layer is disposed on the lower surface of the UV reflective filter layer.

2. The UV-sensitive color-changing cover plate according to claim 1, characterized in that, The UV photosensitive color-changing layer is transparent when there is no UV light and opaque when there is UV light.

3. The UV-sensitive color-changing cover plate according to claim 1, characterized in that, The thickness of the UV photosensitive color-changing layer is between 7 and 9 μm.

4. The UV-sensitive color-changing cover plate according to claim 1, characterized in that, The thickness of the base color ink layer is between 5 and 15 μm.

5. The UV-sensitive color-changing cover plate according to claim 1, characterized in that, The UV reflective filter layer includes several UV high refractive index films and several UV low refractive index films, which are alternately stacked.

6. The UV-sensitive color-changing cover plate according to claim 5, characterized in that, The UV high refractive index film is a tantalum pentoxide film or a titanium dioxide film.

7. The UV-sensitive color-changing cover plate according to claim 5 or 6, characterized in that, The thickness of the UV high refractive index film is between 20-40 nm.

8. The UV-sensitive color-changing cover plate according to claim 5, characterized in that, The UV low refractive index film is a magnesium fluoride film or a silicon dioxide film.

9. The UV-sensitive color-changing cover plate according to claim 5 or 8, characterized in that, The thickness of the UV low refractive index film is between 35-50 nm.

10. The UV-sensitive color-changing cover plate according to claim 1, characterized in that, The transparent cover plate includes a visible area and an outer area, with the outer area surrounding the visible area; the UV photosensitive color-changing layer and the base color ink layer only cover the outer area of ​​the transparent cover plate, while avoiding the visible area of ​​the transparent cover plate.

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