Silver nanowire heater and camera window

Abstract

The utility model relates to a silver nanowire heater and camera window. The silver nanowire heater comprises a first substrate, a silver nanowire transparent conductive thin film, an optical adhesive layer and a second substrate which are sequentially arranged in a stacked mode, electrodes are arranged between the silver nanowire transparent conductive thin film and the optical adhesive layer, and the first substrate is provided with an opening. The opening penetrates through the first substrate and the silver nanowire transparent conductive film, a double-sided conductive metal foil is arranged at one end, close to the silver nanowire transparent conductive film, of the opening, and the metal foil is connected to one end of the electrode. The silver nanowire heater provided by the utility model is simple in structure and high in reliability, can work normally in an outdoor severe environment, and is not easy to fail.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating elements, in particular to a silver nanowire heater and a camera window. Background Art

[0002] Surveillance equipment works in outdoor open places, especially in extremely low temperature environments. Due to differences in ambient temperature and humidity, the lens of the camera equipment may fog or freeze, resulting in unclear images, thus affecting the monitoring effect. In severe cases, it may even make the camera unusable.

[0003] Currently, mainstream camera products primarily achieve defogging through methods such as fans, coatings, and PDS heating. Coatings primarily involve applying an ITO heating film to the camera window surface. However, due to its near-infrared absorption, this affects the camera window's light transmittance. For high-end cameras, additional AR coating is required, significantly impacting product cost. Furthermore, ITO heating films have a slow thermal response when used in heating applications, limiting their application range.

[0004] Silver nanowires possess excellent optoelectronic properties and a moderate heat transfer coefficient, making them an ideal alternative to ITO heaters. However, heaters operate in the most demanding environments of all optoelectronic devices, requiring silver nanowires to possess exceptional chemical and thermal stability. Therefore, the reliability of silver nanowire heaters is a key factor influencing their further application. However, conventional silver nanowire heaters have complex multilayer structures, lacking in density and water- and oxygen-barrier properties. When operating at high temperatures, gaps easily form within the heaters, further exacerbating the ingress of water vapor and causing rapid failure of the heaters in the short term. Consequently, current silver nanowire heaters cannot meet the high reliability requirements of practical applications. Utility Model Content

[0005] Based on this, it is necessary to provide a silver nanowire heater and a camera window thereof to address the above problems; the silver nanowire heater provided by the utility model has a simple structure and high reliability, can work normally in harsh outdoor environments, and is not prone to failure.

[0006] A silver nanowire heater comprises a first substrate, a silver nanowire transparent conductive film, an optical adhesive layer, and a second substrate stacked in sequence, wherein an electrode is provided between the silver nanowire transparent conductive film and the optical adhesive layer;

[0007] An opening is provided on the first substrate, and the opening passes through the first substrate and the silver nanowire transparent conductive film. A double-sided conductive metal foil is provided at one end of the opening close to the silver nanowire transparent conductive film, and the metal foil is connected to one end of the electrode.

[0008] In one embodiment, the metal foil covers the opening.

[0009] In one embodiment, the metal foil is disposed between the silver nanowire transparent conductive film and the electrode.

[0010] In one embodiment, the metal foil is disposed between the optical adhesive layer and the electrode, and the opening also passes through the electrode.

[0011] In one embodiment, the electrode includes a positive electrode and a negative electrode, each of the positive electrode and the negative electrode is connected to a metal foil, the number of the openings is correspondingly set to two, and the two openings are both set close to the edge of the first substrate and are respectively located on opposite sides of the first substrate.

[0012] In one embodiment, the first substrate is configured to be square, and the two openings are provided at two adjacent vertices or opposite vertices of the first substrate.

[0013] In one embodiment, it further includes a wire and a sealant, wherein the wire passes through the opening and is connected to the metal foil, and the sealant fills the opening.

[0014] In one embodiment, the opening is configured as a square, and the length of any side of the opening is 2 mm to 10 mm;

[0015] Alternatively, the opening is configured to be circular, and the diameter of the opening is 2 mm to 10 mm.

[0016] In one embodiment, the electrode has a thickness of 4 μm-10 μm and a width of 3 mm-4 mm.

[0017] A camera window comprises the silver nanowire heater described above.

[0018] The silver nanowire heater provided by this utility model has a simpler layer structure than traditional silver nanowire heaters. By providing openings and metal foil, when connected to an external power source, a wire can be inserted into the opening and connected to the metal foil, thereby achieving electrical connection between the electrode and the external power source. Unlike conventional structures where wires exit from the side of the optical adhesive layer, this utility model achieves direct wire exit from the surface of the heater. Under high-temperature operating conditions, the layer structure is less likely to have gaps, effectively improving the structural density and water and oxygen barrier properties, enabling the heater to operate long-term under high temperature and high humidity conditions, thus meeting the high reliability requirements of heaters in practical applications. In addition, the metal foil provided at one end of the electrode overcomes the technical problem of excessive contact resistance at the traditional soldered wire connection, reducing the risk of failure at the wire connection, which helps further improve the reliability of the silver nanowire heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the longitudinal cross-sectional structure of a silver nanowire heater in one embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of a silver nanowire heater in another embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of a silver nanowire heater in another embodiment of the present invention;

[0022] Figure 4 This is a top perspective view of a silver nanowire heater in one embodiment of the present invention.

[0023] Among them, 101 is the first substrate; 102 is the silver nanowire transparent conductive film; 103 is the optical adhesive layer; 104 is the second substrate; 105 is the electrode; 1051 is the positive electrode; 1052 is the negative electrode; 106 is the opening; 107 is the metal foil; 108 is the wire; 109 is the sealant. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present invention, the present invention will be described in more detail below. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. Rather, these embodiments or examples are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments or examples and are not intended to limit the present invention.

[0026] Unless otherwise specified, the terms "including" and "comprising" used herein may be open-ended or closed-ended. For example, "including" and "comprising" may mean that other components not listed may also be included or comprised, or may mean that only the listed components are included or comprised. Unless otherwise specified, as used herein, "one or more" or "at least one" refers to any one, any two, or more of the listed items. "Several" refers to any two or more of the listed items.

[0027] Combine Figure 1 and Figure 4As shown, it is a schematic diagram of the longitudinal cross-sectional structure of a silver nanowire heater in an embodiment provided by the present invention, comprising a first substrate 101, a silver nanowire transparent conductive film 102, an optical adhesive layer 103 and a second substrate 104 stacked in sequence, and an electrode 105 is provided between the silver nanowire transparent conductive film 102 and the optical adhesive layer 103.

[0028] Among them, an opening 106 is provided on the first substrate 101, and the opening 106 passes through the first substrate 101 and the silver nanowire transparent conductive film 102, and a double-sided conductive metal foil 107 is provided at one end of the opening 106 close to the silver nanowire transparent conductive film 102, and the metal foil 107 is connected to one end of the electrode 105.

[0029] The silver nanowire heater provided by the present invention has a simpler layer structure than conventional silver nanowire heaters. By providing an opening 106 and a metal foil 107, when connected to an external power source, a wire 108 can be inserted into the opening 106 and connected to the metal foil 107, thereby achieving electrical connection between the electrode 105 and the external power source. Unlike conventional structures where wires exit from the side of the optical adhesive layer 103, the present invention allows wires to exit directly from the heater's surface. This reduces the risk of gaps in the layer structure under high-temperature operating conditions, effectively improving the structural density and water- and oxygen-barrier properties, enabling the heater to operate long-term under high-temperature and high-humidity conditions, thus meeting the high reliability requirements for heaters in practical applications. Furthermore, the metal foil 107 provided at one end of the electrode 105 overcomes the technical problem of excessive contact resistance at conventional soldered wire connections, reducing the risk of failure at the wire connection and further improving the reliability of the silver nanowire heater.

[0030] It can be understood that the double-sided conductive metal foil 107 arranged at one end of the opening 106 near the silver nanowire transparent conductive film 102 can cover part of the opening 106 to ensure that the part covering the opening 106 can be connected to the wire 108 penetrating into the opening 106. Preferably, the metal foil 107 covers the opening 106.

[0031] like Figure 1 As shown, the metal foil 107 is arranged between the silver nanowire transparent conductive film 102 and the electrode 105, so that the metal foil 107 is partially exposed in the opening 106 near the silver nanowire transparent conductive film 102, so that the wire 108 can pass through the opening 106 and connect with the metal foil 107.

[0032] In another embodiment, the combination Figure 2As shown, the metal foil 107 is arranged between the optical adhesive layer 103 and the electrode 105, and the opening 106 also passes through the electrode 105, so that the metal foil 107 is partially exposed in the opening 106 near the electrode 105, so that the wire can pass through the opening 106 and connect with the metal foil 107.

[0033] In one embodiment, the metal foil 107 includes but is not limited to at least one of copper foil, silver foil, gold foil, and aluminum foil.

[0034] In one embodiment, the electrode 105 includes a positive electrode 1051 and a negative electrode 1052, and each of the positive electrode 1051 and the negative electrode 1052 is connected to a metal foil 107. The number of the openings 106 is correspondingly set to two. The two openings 106 are both set close to the edge of the first substrate 101 and are respectively located on opposite sides of the first substrate 101, which is beneficial to reducing the internal discontinuity of the heater and reducing the risk of gaps inside the heater, thereby further improving reliability.

[0035] It can be understood that since the present invention realizes the direct output of wires from the surface of the heater, based on the unique heater structure, the present invention does not limit the position of the opening 106, that is, the opening 106 in the present invention can be at any position on the surface of the heater, or can be set according to the position of the electrode in a traditional heater, for example, two openings 106 are set at adjacent positions.

[0036] It should be noted that the present invention does not limit the shape of the first substrate 101. Those skilled in the art can adopt first substrates 101 of different shapes according to actual heater product requirements, such as square, circular, fan-shaped, ring-shaped and irregular shapes.

[0037] In one embodiment, the first substrate 101 is configured to be square, and the two openings 106 are disposed at two adjacent vertices or opposite vertices of the first substrate 101 .

[0038] In another embodiment, the first substrate 101 is configured to be circular, and the two openings 106 are disposed at either end of a diameter of the first substrate 101 .

[0039] In one embodiment, combining Figure 3 As shown, the silver nanowire heater provided by the present invention also includes a wire 108 and a sealant 109. The wire 108 passes through the opening 106 and is connected to the metal foil 107. The sealant 109 fills the opening 106, which is beneficial to improving the sealing effect of the silver nanowire heater during use and preventing water vapor from entering the interior of the heater, thereby further improving reliability.

[0040] In one embodiment, the opening 106 is set to be square, and the length of any side of the opening 106 is preferably 2mm-10mm, including but not limited to any point value of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or any range value between two of them.

[0041] In another embodiment, the opening 106 is configured to be circular, and the diameter of the opening 106 is preferably 2 mm to 10 mm, including but not limited to any point value among 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or any range value between two thereof.

[0042] In one embodiment, combining Figure 4 As shown, the positive electrode 1051 and the negative electrode 1052 are respectively close to two opposite sides of the first substrate 101. Furthermore, the positive electrode 1051 and the negative electrode 1052 are parallel to each other.

[0043] In one embodiment, the thickness of the electrode 105 is preferably 4 μm to 10 μm, including but not limited to any value among 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, and 10 μm, or any range therebetween. The width of the electrode 105 is preferably 3 mm to 4 mm, including but not limited to any value among 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, and 4 mm, or any range therebetween. It is understood that the dimensions of the positive electrode 1051 and the negative electrode 1052 in the electrode 105 are independently selected from any of the aforementioned values ​​or any range therebetween.

[0044] It is understandable that the present invention does not limit the shape and size of the opening 106 and the electrode 105 in the heater. Those skilled in the art can set them according to the actual heater product requirements. For example, the size of the opening 106 depends on the length and thickness of the subsequent connecting wire 108.

[0045] In one embodiment, the electrode 105 includes but is not limited to a silver electrode.

[0046] In one embodiment, the materials of the first substrate 101 and the second substrate 104 are independently selected from a flexible substrate or a glass substrate. Preferably, the material of the first substrate 101 is selected from a flexible substrate, and the material of the second substrate 104 is selected from a glass substrate.

[0047] Specifically, the flexible substrate includes but is not limited to poly (arylene ether nitrile) (PEN) or polyethylene terephthalate (PET).

[0048] In one embodiment, the preparation method of the silver nanowire heater of the present invention comprises the following steps:

[0049] S1. Depositing a layer of silver nanowire transparent conductive film 102 on the surface of the first substrate 101 to form a composite film material, and subjecting the composite film material to an aging treatment, wherein the deposition process includes at least one of spraying, spin coating, electrostatic adsorption, and screen printing, and the aging treatment temperature is 120° C. to 160° C., preferably 130° C. to 150° C., and the time is 20 min to 60 min, preferably 30 min to 50 min;

[0050] S2, cutting the aged composite film material according to the size of the second substrate 104, and then drilling holes in the composite film material to obtain openings 106, wherein the openings 106 penetrate the first substrate 101 and the silver nanowire transparent conductive film 102;

[0051] S3. Disposing a double-sided conductive metal foil 107 on the silver nanowire transparent conductive film 102, with the metal foil 107 covering the opening 106, and laminating the metal foil 107 with high pressure, wherein the laminating pressure is 0.05 MPa-0.5 MPa, preferably 0.1 MPa-0.2 MPa, and the laminating time is 5 min-30 min, preferably 10 min-15 min;

[0052] S4, continue to set the electrode 105 on the surface of the metal foil 107, and then bake and solidify it, the baking temperature is 110°C-160°C, preferably 120°C-140°C, and the baking time is 15min-60min, preferably 20min-40min;

[0053] S5. Attach the optical adhesive to the surface of the composite film material, and flip-chip attach it to the surface of the second substrate 104, and obtain a silver nanowire heater by high-temperature and high-pressure degassing, wherein the degassing temperature is 50°C-70°C, preferably 50°C-60°C, the degassing pressure is 0.1MPa-0.7MPa, preferably 0.2MPa-0.6MPa, and the degassing time is 10min-60min, preferably 20min-50min.

[0054] In another embodiment, the preparation method of the silver nanowire heater differs from the above preparation method only in that steps S3 and S4 are slightly different: first, an electrode 105 is set on the silver nanowire transparent conductive film 102, so that one end of the electrode 105 surrounds the opening 106 and ensures that the opening 106 is not covered by the electrode 105. After baking and curing, a metal foil 107 is set on the opening 106 and pressed under high pressure.

[0055] The utility model also provides a camera window, comprising the silver nanowire heater as described above.

[0056] The camera window provided by the utility model can achieve excellent demisting and defrosting effects, effectively solving the problem of unclear shooting images caused by fogging and frosting of the window, and ensuring that the camera can be used normally in harsh working environments such as high temperature and high humidity.

[0057] It should be noted that the present invention does not impose any restrictions on the specific structure of the camera window, and any conventional camera window structure provided in the prior art is feasible.

[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A silver nanowire heater, comprising a first substrate, a silver nanowire transparent conductive film, an optical adhesive layer, and a second substrate stacked in sequence, wherein an electrode is provided between the silver nanowire transparent conductive film and the optical adhesive layer, characterized in that: An opening is provided on the first substrate, and the opening passes through the first substrate and the silver nanowire transparent conductive film. A double-sided conductive metal foil is provided at one end of the opening close to the silver nanowire transparent conductive film, and the metal foil is connected to one end of the electrode.

2. The silver nanowire heater according to claim 1, characterized in that The metal foil covers the opening.

3. The silver nanowire heater according to claim 1 or 2, characterized in that: The metal foil is arranged between the silver nanowire transparent conductive film and the electrode.

4. The silver nanowire heater according to claim 1 or 2, characterized in that The metal foil is arranged between the optical adhesive layer and the electrode, and the opening also passes through the electrode.

5. The silver nanowire heater according to claim 1, wherein The electrodes include a positive electrode and a negative electrode, each of the positive electrode and the negative electrode is connected to a metal foil, the number of the openings is correspondingly set to two, and the two openings are both set close to the edge of the first substrate and are respectively located on opposite sides of the first substrate.

6. The silver nanowire heater according to claim 5, characterized in that The first substrate is configured to be square, and the two openings are configured at two adjacent vertices or opposite vertices of the first substrate.

7. The silver nanowire heater according to claim 1, wherein It also includes a wire and a sealant. The wire passes through the opening and is connected to the metal foil, and the sealant fills the opening.

8. The silver nanowire heater according to claim 1, wherein The opening is set to be square, and the length of any side of the opening is 2mm-10mm; Alternatively, the opening is configured to be circular, and the diameter of the opening is 2 mm to 10 mm.

9. The silver nanowire heater according to claim 1, wherein The electrode has a thickness of 4 μm-10 μm and a width of 3 mm-4 mm.

10. A camera window, characterized in that: The camera window comprises the silver nanowire heater according to any one of claims 1 to 9.

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