Patterned wave-transparent heating film

Abstract

The utility model provides a patterned wave-transparent heating film, which comprises a substrate and a metal pattern conductive layer arranged on the substrate, the metal pattern conductive layer comprises a conductive circuit area and a plurality of wave-transparent areas, and the area of the wave-transparent areas accounting for the metal pattern conductive layer is greater than 99%. According to the patterned wave-transparent heating film, heating and wave transmission are realized through the metal pattern conductive layer arranged on the substrate, heating in a short time can be realized, and the wave-transparent effect is enhanced by increasing the area of a wave-transparent area. Meanwhile, due to the fact that the circuit of the metal pattern conducting layer is thin, the light transmission performance is greatly improved, the advantages of being small in sight shielding and attractive in appearance are achieved, and diversified application can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating films, in particular to a patterned wave-transparent heating film. Background Art

[0002] With the development of technology, breakthroughs have been made in radar technology, and millimeter-wave radar has become the preferred technology for autonomous driving, requiring the radar to work all-weather. When the vehicle is driving in some bad weather, ice and snow will accumulate in the front area (such as the vehicle logo, the front radar cover, the front surface, etc.), blocking the projection of radar signals and also obscuring the driver's line of sight, which is not conducive to driving. To solve this problem, the existing technical solutions usually add a heating film in the front area to prevent the signal transmission from being blocked in snowy weather and affecting driving.

[0003] The transparent heating films on the existing market usually adopt ITO-based heating films, which are a kind of whole-surface conductive materials. Although they are transparent, they will affect the wave-transparent effect. This is an important problem for millimeter-wave radars that require high wave-transparency. Moreover, the patterns of the existing ITO heating films are fixed and cannot achieve diversified applications. On the other hand, there are also heating films with metal wire heating on the existing market. Such heating films have problems such as thick metal lines, reduced wave-transparent area, blocking of radar waves, and obvious metal lines, which are not beautiful. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a patterned wave-transparent heating film, which generates heat and transmits waves through a metal pattern conductive layer arranged on a substrate. The metal pattern conductive layer includes a conductive circuit area and a plurality of wave-transparent areas; the area of the wave-transparent areas in the metal pattern conductive layer is greater than 99%. Short-time heating can be achieved, and the wave-transparent effect is enhanced by increasing the area of the wave-transparent areas. At the same time, since the lines of the metal pattern conductive layer are relatively thin, the light-transmitting performance is greatly improved, and it has the advantages of small line-of-sight obstruction and beauty.

[0005] The utility model provides a patterned wave-transparent heating film, which includes a substrate and a metal pattern conductive layer arranged on the substrate. The metal pattern conductive layer includes a conductive circuit area and a plurality of wave-transparent areas, and the area of the wave-transparent areas in the metal pattern conductive layer is greater than 99%.

[0006] Specifically, the side length of the wave-transparent area is greater than 0.3 mm.

[0007] Specifically, the graphic structure of the conductive circuit area includes hexagons, rhombuses, quadrilaterals and irregular polygons.

[0008] Specifically, the side length range of the graphic structure of the conductive circuit area is 0.3 mm to 10 mm, and the line width range is 2 μm to 15 μm.

[0009] Specifically, the conductive circuit region includes a plurality of strip-shaped graphic circuits arranged in parallel.

[0010] Specifically, the width range of the strip-shaped graphic circuit is 0.5 mm to 1 mm.

[0011] Specifically, a sub-conductive circuit region and a plurality of sub-wave-transmitting regions are provided in the strip-shaped graphic circuit, and the side length range of the graphic structure of the sub-conductive circuit region is 0.3 mm to 0.5 mm.

[0012] Specifically, the side length range of the plurality of wave-transmitting regions is 5 mm to 10 mm.

[0013] Specifically, the sheet resistance range of the metal graphic conductive layer is 0.015 Ω / square to 5 Ω / square.

[0014] Specifically, the metal graphic conductive layer further includes at least two electrodes, and the electrodes are arranged on both sides of the metal graphic conductive layer and are electrically connected to the metal graphic conductive layer.

[0015] In summary, the graphic wave-transmitting heating film of the present invention can generate heat and transmit waves through the metal graphic conductive layer provided on the substrate. The metal graphic conductive layer includes a conductive circuit region and a plurality of wave-transmitting regions; the area of the wave-transmitting region in the metal graphic conductive layer is greater than 99%, which can reduce the loss when the wave passes through the graphic wave-transmitting heating film, and can improve the area of the wave-transmitting region as much as possible. It has the advantages of high wave transmission rate, rapid heating in a short time, and small line-of-sight obstruction.

[0016] Moreover, the graphic structure of the conductive circuit region includes hexagons, rhombuses, quadrilaterals and irregular polygons, and the circuit is relatively thin, making the graphic wave-transmitting heating film more beautiful.

[0017] Moreover, the conductive circuit region includes a plurality of strip-shaped graphic circuits arranged in parallel, and the gaps between the strip-shaped graphic circuits form a plurality of wave-transmitting regions with a side length range of 5 mm to 10 mm.

[0018] Moreover, a sub-conductive circuit region and a plurality of sub-wave-transmitting regions are provided in the strip-shaped graphic circuit. The side length range of the graphic structure of the sub-conductive circuit region is 0.3 mm to 0.5 mm, and a plurality of sub-wave-transmitting regions are formed in the hollow part of the graphic structure of the sub-conductive circuit region.

[0019] Moreover, the gaps between the strip-shaped graphic circuits and the hollow parts of the graphic structure of the sub-conductive circuit region form a wave-transmitting region, which can allow radar waves to penetrate. The wave-transmitting region accounts for more than 99% of the surface area of the graphic wave-transmitting heating film, and the wave transmission rate is high. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 Structural schematic diagram of the metal pattern conductive layer in the first embodiment of the present utility model;

[0022] Figure 2 Graphical structure example diagram in the first embodiment of the present utility model;

[0023] Figure 3 Structural schematic diagram of the metal pattern conductive layer in the second embodiment of the present utility model;

[0024] Figure 4 Structural schematic diagram of the metal pattern conductive layer in the third embodiment of the present utility model;

[0025] Figure 5 For Figure 4 Partial enlarged view of area A in;

[0026] Figure 6 Structural schematic diagram of the first area in the third embodiment of the present utility model;

[0027] Figure 7 Cross-sectional schematic diagram of the patterned wave-transmitting heating film in the third embodiment of the present utility model.

[0028] Among them, the reference numerals of the embodiments of the present utility model in the above-mentioned drawings are as follows:

[0029] 100, substrate; 110, first area;

[0030] 200, metal pattern conductive layer; 210, conductive circuit area; 211, strip-shaped graphic circuit; 212, sub-conductive circuit area; 213, sub-wave-transmitting area; 220, wave-transmitting area; 230, electrode;

[0031] 300, adhesive layer;

[0032] 400, protective layer. Detailed implementation manners

[0033] The specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the description of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "arrangement", "installation", "connection", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of description and simplification of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0036] Terms such as "first", "second", "third", etc. are only used to distinguish elements with similar attributes, rather than indicating or implying relative importance or a specific order.

[0037] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to the listed elements, it may also include other elements not specifically listed.

[0038] The following will be described in detail through specific embodiments.

[0039] The first embodiment of the present utility model provides a patterned wave-transparent heating film, which includes a substrate 100 and a metal pattern conductive layer 200 disposed on the substrate 100. The metal pattern conductive layer 200 includes a conductive circuit area 210 and a plurality of wave-transparent areas 220, and the area of the wave-transparent areas 220 in the metal pattern conductive layer 200 is greater than 99%.

[0040] Specifically, the structure of the metal pattern conductive layer 200 is as Figure 1 shown in a circular shape, and the metal pattern conductive layer 200 is disposed on the substrate 100. The conductive circuit area 210 includes multiple segments of conductive circuits, and the conductive circuits are used to generate heat after being energized. The wave-transparent areas 220 include the pores between the conductive circuits in the conductive circuit area 210 and other pores outside the conductive circuit area 210. Each pore is an individual wave-transparent area 220, and the metal pattern conductive layer 200 includes a plurality of wave-transparent areas 220 for allowing radar waves to pass through the wave-transparent areas 220.

[0041] In this embodiment, the side length of the wave-transparent area 220 is greater than 0.3 mm. If the side length of the wave-transparent area 220 is less than 0.3 mm, the wave-transparent effect will be reduced.

[0042] In this embodiment, the graphic structure of the conductive line region 210 includes hexagons, rhombuses, quadrilaterals, and irregular polygons. Specifically, as Figure 1 shown, the graphic structure of the conductive line region 210 in this embodiment is an equilateral hexagon (honeycomb shape). Optionally, Figure 2 is an example of the graphic structure, Figure 2 a is a rhombus, Figure 2 b is an equilateral hexagon (honeycomb shape), Figure 2 c is an irregular polygon, Figure 2 d is a quadrilateral. It has the advantages of small shielding area and low impedance. The size of the equilateral hexagon pattern can be adjusted according to the wave transmission effect, and the minimum side length is 1 mm.

[0043] In this embodiment, the side length range of the graphic structure of the conductive line region 210 is 0.3 mm to 10 mm, and the line width range is 2 μm to 15 μm. Specifically, multiple conductive lines in the conductive line region 210 form a network structure, and the mesh holes form the graphic structure. For example, in this embodiment, multiple conductive lines form an equilateral hexagon, where the side length of the equilateral hexagon is 0.3 mm to 10 mm, and the equilateral hexagon holes surrounded by the conductive lines are the wave transmission regions 220, and the line width of the conductive lines is 2 μm to 15 μm. The duty cycle of the conductive lines and the electrodes 230 is 0.1% - 1%, that is, more than 99% of the area of the metal graphic conductive layer 200 is the wave transmission region 220. The transmittance of the radar wave is high, reaching more than 90%, and the signal transmission performance is excellent.

[0044] In this embodiment, the sheet resistance range of the metal graphic conductive layer 200 is 0.015 Ω / □ to 5 Ω / □. The resistance of the metal graphic conductive layer 200 mainly includes the line resistance of the conductive lines.

[0045] In this embodiment, the metal graphic conductive layer 200 further includes at least two electrodes 230, and the electrodes 230 are arranged on both sides of the metal graphic conductive layer 200. Specifically, both ends of the conductive line region 210 are respectively connected to two arc-shaped electrodes 230 for forming a path.

[0046] As Figure 3 shown, the second embodiment of the present invention provides a patterned wave-transmitting heating film. Compared with the first embodiment, the whole of this embodiment is rectangular, and the multiple conductive lines in the conductive line region 210 form a graphic structure of an irregular shape, and the electrodes 230 are straight lines. In other embodiments, the graphic structure formed by the conductive lines may also include hexagons, rhombuses, and quadrilaterals.

[0047] As Figures 4 to 7 shown, the third embodiment of the present invention provides a patterned wave-transmitting heating film, and the overall structure is similar to that of the first embodiment and the second embodiment.

[0048] In this embodiment, the conductive line region 210 includes a plurality of strip-shaped graphic lines 211 arranged in parallel. The plurality of strip-shaped graphic lines 211 are arranged at equal intervals, and the wave-transmitting region 220 includes pores between adjacent strip-shaped graphic lines 211.

[0049] Specifically, as Figure 4 and Figure 5 shown, strip-shaped graphic lines 211 are provided on the metal graphic conductive layer 200, and the plurality of strip-shaped graphic lines 211 are arranged at preset positions to form a graphic structure.

[0050] In this embodiment, the plurality of strip-shaped graphic lines 211 are evenly distributed. Specifically, the strip-shaped graphic lines 211 are in the shape of horizontal bars, and the electrodes 230 are in the shape of vertical bars. The plurality of strip-shaped graphic lines 211 are evenly distributed between the two electrodes 230, and the strip-shaped graphic lines 211 and the electrodes 230 form a graphic in the shape of the Chinese character "mu". Optionally, the strip-shaped graphic lines 211 can also be curves, and the electrodes 230 can also be curves.

[0051] As Figure 5 shown, in this embodiment, the width W1 of the strip-shaped graphic lines 211 ranges from 0.5 mm to 1 mm. Specifically, the strip-shaped graphic lines 211 can be made of materials with conductive properties such as metal materials, silver paste, copper paste, carbon paste, silver nanowires, and carbon nanotubes. When current flows in the strip-shaped graphic lines 211, the strip-shaped graphic lines 211 generate heat, and the amount of heat generated and the level of heat generation power are determined by the height and width of the strip-shaped graphic lines 211. Specifically, the higher the height of the strip-shaped graphic lines 211, the greater the amount of heat generated and the higher the heat generation power; the higher the width of the strip-shaped graphic lines 211, the greater the amount of heat generated and the higher the heat generation power. When the height of the strip-shaped graphic lines 211 increases and the width remains unchanged, both the amount of heat generated and the heat generation power can be improved without reducing the penetration rate of radar waves.

[0052] As Figure 5 shown, in this embodiment, a sub-conductive line region 212 and a plurality of sub-wave-transmitting regions 213 are provided in the strip-shaped graphic lines 211, and the side length L of the graphic structure of the sub-conductive line region 212 ranges from 0.3 mm to 0.5 mm.

[0053] Specifically, the multi-segment conductive lines in the sub-conductive line region 212 form a mesh structure, and the mesh holes form a graphic structure. For example, in this embodiment, the multi-segment conductive lines form a rhombus, where the side length of the rhombus is 0.3 mm to 0.5 mm. The rhombus holes surrounded by the conductive lines are the sub-wave-transmitting regions 213, and the line width of the conductive lines is 2 μm to 15 μm. In this embodiment, the duty cycle of the conductive lines and the electrodes 230 is 0.05%, that is, more than 99.5% of the area of the metal graphic conductive layer 200 is the wave-transmitting region 220. The radar wave has a high transmittance, which can reach more than 90%, and the signal transmission performance is excellent. Optionally, the graphic structure can be an equilateral hexagon ( Figure 2 b), a rhombus ( Figure 2 a), a quadrilateral ( Figure 2 d), other non-standard shapes ( Figure 5 ), etc.

[0054] As Figure 4 shown, in this embodiment, there are pores between adjacent strip-shaped graphic lines 211, and the pores form the wave-transmitting region 220. Since the spacing W2 between the strip-shaped graphic lines 211 is 5 mm to 10 mm, the width range of the wave-transmitting region 220 is also 5 mm to 10 mm, and the length of the wave-transmitting region 220 is determined by the length of the strip-shaped graphic lines 211.

[0055] In this embodiment, the metal graphic conductive layer 200 further includes at least two electrodes 230, and multiple strip-shaped graphic lines 211 are connected between the at least two electrodes 230. Specifically, the strip-shaped graphic lines 211 are arranged horizontally, and the two electrodes 230 are respectively arranged at the left and right ends of the strip-shaped graphic lines 211. The electrodes 230 can be manufactured by methods such as printing silver paste and pasting copper foil. Since one electrode 230 is simultaneously connected to one end of multiple strip-shaped graphic lines 211, the circuit is designed in parallel, and the current flows through the multiple strip-shaped graphic lines 211. The overall circuit has a low line resistance and uniform heat generation. The circuit impedance composed of the strip-shaped graphic lines 211 and the electrodes 230 is very low, and the sheet resistance is less than 5 ohms per square.

[0056] Specifically, the wave-transmitting region 220 of the metal graphic conductive layer 200 includes the pores between the strip-shaped graphic lines 211 and the pores of the graphic structure in the sub-conductive line region 212 (i.e., the sub-wave-transmitting region 213), and the wave-transmitting region 220 can allow radar waves and light to pass through. Since the wave-transmitting region 220 accounts for more than 99.5% of the surface area of the metal graphic conductive layer 200, the patterned wave-transmitting heating film has the advantages of high wave transmission, high transmittance, and low occlusion.

[0057] In this embodiment, the conductive area lines in the metal graphic conductive layer 200 are uniformly arranged. In other embodiments, grid lines with a wider line width can also be used in the middle region of the metal graphic conductive layer 200, and grid lines with a narrower line width can be used in the edge region to adapt to the scenario where rapid heating is required in a concentrated area. AsFigure 6 As shown, the metal pattern conductive layer 200 is divided into a first region 110 and a second region, and the total heat generation power of the first region 110 is greater than that of the second region. For example, when the patterned wave-transparent heating film is attached to the radome, the first region 110 covers the radar wave emission port; when the patterned wave-transparent heating film is attached to the car logo, the first region 110 covers the main shape of the car logo; when the patterned wave-transparent heating film is attached to the window or rearview mirror, the first region 110 covers the area where the line of sight is concentrated. When the patterned wave-transparent heating film is used on the vehicle body, it can be set in areas such as the rearview mirror, headlights, and front of the vehicle.

[0058] In the above scenarios, the first region 110 needs to be quickly heated or generate more heat to quickly melt the ice and snow or evaporate the rainwater in the first region 110. Specifically, Figure 6 The area within the dashed line box in the figure is the first region 110, and the area from outside the dashed line box to the boundary of the substrate 100 is the second region. The shape of the first region 110 can be square or other shapes. The shape division of the first region 110 and the second region is determined according to actual needs, and the present invention does not limit this.

[0059] As Figure 7 Shown is a cross-sectional schematic diagram of the patterned wave-transparent heating film in the third embodiment of the present invention. From top to bottom, there are a protective layer 400, an adhesive layer 300, a metal pattern conductive layer 200, a substrate 100, and another protective layer 400. The main body of the metal pattern conductive layer 200 is an optical glue layer, and grooves are formed on the optical glue layer to accommodate the graphic structure lines. The height and width of the graphic structure lines can be adjusted according to the needs of heat generation amount and heat generation power. The higher the width of the graphic structure lines, the higher the heat generation amount and heat generation power; the higher the height of the graphic structure, the higher the heat generation amount and heat generation power.

[0060] The present invention also provides a method for manufacturing a patterned wave-transparent heating film for manufacturing the patterned wave-transparent heating film in the above embodiments. The method includes the following steps:

[0061] Step S1: Provide a substrate 100.

[0062] Step S2: Using one surface of the substrate 100 as a bearing surface, fabricate a metal pattern conductive layer 200 on the bearing surface.

[0063] Among them, the above step S2 includes the following steps:

[0064] Step S21: Set an optical glue layer on the bearing surface;

[0065] Step S22: Imprint grooves with a preset pattern on the optical glue layer;

[0066] Step S23: Scrape and fill the conductive material into the groove, and cure the optical glue layer and the conductive material in the groove;

[0067] Step S24: Set electrodes 230 on both sides of the glue layer.

[0068] Step S25: Form the metal pattern conductive layer 200.

[0069] Step S3: Coat a bonding layer 300 on the surface of the metal pattern conductive layer 200 away from the substrate 100.

[0070] Step S4: Bond a protective layer 400 on the surface of the bonding layer 300 away from the metal pattern conductive layer 200.

[0071] Step S5: Bond another protective layer 400 on the other surface of the substrate 100.

[0072] In the above step S1, the substrate 100 can be made of transparent materials such as PET, PC, PMMA, glass, etc.

[0073] In the above step S21, the optical glue layer can be UV glue.

[0074] In the above step S23, the conductive material can be a metal material, silver paste, copper paste, carbon paste, silver nanowire, carbon nanotube and other materials with conductive properties. After curing the conductive material in the groove by heating and curing, a circuit with a preset pattern is formed.

[0075] In the above step S24, the method of setting the electrodes 230 can be printing silver paste, pasting copper foil, etc. The electrodes 230 are set on the side surface of the glue layer. Correspondingly, the strip-shaped graphic circuit 211, the electrodes 230 and the optical glue layer constitute the metal pattern conductive layer 200.

[0076] Optionally, before the above step S5, another metal pattern conductive layer 200 and another bonding layer 300 can be sequentially made on the other surface of the substrate 100, and finally another protective layer 400 is bonded. In this way, a metal pattern conductive layer 200 is provided on both sides of the substrate 100, and the heating effect is better. For example, the circuit positions of the two metal pattern conductive layers 200 can be complementary to improve the heating uniformity; or the circuit positions can overlap to enhance the heat generation in the overlapping area.

[0077] In summary, the graphical wave-transmitting heating film of the present utility model generates heat and transmits waves through the metal graphic conductive layer 200 disposed on the substrate 100, enabling heating in a short time. Moreover, by increasing the area of the wave-transmitting region 220, with the area of the wave-transmitting region accounting for more than 99% of the area of the metal graphic conductive layer 200, the wave-transmitting effect is enhanced to meet the application requirements under harsh weather or special conditions. At the same time, due to the relatively thin lines of the metal graphic conductive layer 200, the light-transmitting performance is greatly improved, and it has the advantages of small line-of-sight obstruction and good aesthetics, and can be used in diverse application scenarios.

[0078] As described above, the above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the appended claims.

Claims

1. A patterned wave-transmitting heating film, characterized in that: The invention comprises a substrate (100) and a metal pattern conductive layer (200) arranged on the substrate (100), wherein the metal pattern conductive layer (200) comprises a conductive line area (210) and a plurality of wave-transmitting areas (220), and the wave-transmitting areas (220) occupy more than 99% of the area of ​​the metal pattern conductive layer (200).

2. The patterned wave-transmitting heating film according to claim 1, characterized in that: The side length of the wave-transmitting area (220) is greater than 0.3 mm.

3. The patterned wave-transmitting heating film according to claim 1, characterized in that: The graphic structure of the conductive circuit area (210) includes a hexagon, a rhombus, a quadrilateral and an irregular polygon.

4. The patterned wave-transmitting heating film according to claim 1, characterized in that: The graphic structure of the conductive circuit area (210) has a side length ranging from 0.3 mm to 10 mm, and a line width ranging from 2 μm to 15 μm.

5. The patterned wave-transmitting heating film according to claim 1, characterized in that: The conductive circuit area (210) comprises a plurality of strip-shaped patterned circuits (211) arranged in parallel.

6. The patterned wave-transmitting heating film according to claim 5, characterized in that: The width of the strip-shaped graphic circuit (211) ranges from 0.5 mm to 1 mm.

7. The patterned wave-transmitting heating film according to claim 5, characterized in that: A sub-conductive circuit area (212) and a plurality of sub-wave-transmitting areas (213) are arranged in the strip-shaped graphic circuit (211); the graphic structure side length of the sub-conductive circuit area (212) ranges from 0.3 mm to 0.5 mm.

8. The patterned wave-transmitting heating film according to claim 5, characterized in that: The side lengths of the plurality of wave-transmitting areas (220) range from 5 mm to 10 mm.

9. The patterned wave-transmitting heating film according to claim 1, characterized in that: The square resistance of the metal pattern conductive layer (200) is in the range of 0.015Ω / □ to 5Ω / □.

10. The patterned wave-transmitting heating film according to claim 1, characterized in that: The metal pattern conductive layer (200) further comprises at least two electrodes (230), wherein the electrodes (230) are arranged on both sides of the metal pattern conductive layer (200) and are electrically connected to the metal pattern conductive layer (200).

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