Heating film, light-emitting device and motor vehicle

Abstract

The invention provides a heating film (100) which comprises a transparent base layer (10), the base layer is flexible, and the base layer comprises a first side face (11) and a second side face (12) which are oppositely arranged; and a heating circuit layer (20) directly attached to the second side surface of the base layer.

Description

Technical Field

[0001] The present application relates to the field of lighting technology, and more particularly, to a heating film, a light-emitting device and a motor vehicle. Background Art

[0002] In the field of lighting, various lighting or signaling devices are known for providing light for lighting or signaling. For example, headlights are used in motor vehicles to provide lighting or signaling functions to ensure safe driving or to provide decorative functions.

[0003] However, in cold weather, when the headlights are covered with ice, they cannot function effectively. Currently available headlights with heated functions often have a prominent design, making it difficult to match the body shape. This not only affects the appearance but can also affect the function of the headlights, posing a safety hazard to driving.

[0004] Therefore, it is currently an urgent need to improve the component design of existing vehicle lights and to provide a new light-emitting device to overcome the defects of the existing technology. Summary of the Invention

[0005] One purpose of the present application is to overcome at least one of the problems and drawbacks in the prior art.

[0006] A first aspect of the present application provides a heating film, comprising:

[0007] a transparent base layer, the base layer being flexible and comprising a first side surface and a second side surface disposed opposite to each other; and

[0008] A heating circuit layer is directly attached to the second side surface of the base layer.

[0009] In some embodiments, the tensile modulus of the base layer is greater than or equal to 1500 MPa, and the metal adhesion of the base layer is greater than or equal to 4B.

[0010] In some embodiments, the base layer includes a first plastic and a second plastic intermixed with each other;

[0011] The tensile modulus of the first plastic is greater than that of the second plastic, and the metal adhesion of the second plastic is greater than that of the first plastic;

[0012] The tensile modulus of the first plastic is greater than or equal to 1500 MPa, and the metal adhesion of the second plastic is greater than or equal to 4B.

[0013] In some embodiments, the first plastic is polycarbonate and the second plastic is polyethylene terephthalate.

[0014] In some embodiments, the first side of the base layer is configured to have a three-dimensional shape.

[0015] In some embodiments, the heating circuit layer is obtained by sputtering a metal layer on the second side of the base layer and etching the metal layer.

[0016] In some embodiments, the heating circuit layer is transparent and includes a pattern formed by conductive metal wires;

[0017] The thickness of the conductive metal wire is less than or equal to 0.001 mm;

[0018] The conductive metal wire has a line width less than or equal to 0.001 mm;

[0019] The line spacing of the conductive metal wires is between 0.05-4 mm.

[0020] In some embodiments, the heating film is used to heat the lens;

[0021] The heating film is injection molded onto the lens through an in-mold injection process, or the heating film is bonded onto the lens.

[0022] In some embodiments, the heating film further comprises a first white printed layer, wherein the first white printed layer is attached to a side of the heating circuit layer away from the base layer; and

[0023] A first black printed layer is attached to the second side surface of the base layer and is located at the periphery of the heating circuit layer. The black printed layer is used for light shielding.

[0024] In some embodiments, the first white printed layer includes a first logo area and a light reflecting area, the first logo area is used to transmit light, and the light reflecting area is used to reflect light.

[0025] In some embodiments, the heating film further includes a second white printed layer, the second white printed layer being attached to the first side of the base layer, the second white printed layer having the functions of transmitting and diffusing light; and

[0026] A second black printing layer is attached to a side of the second white printing layer away from the base layer.

[0027] In some embodiments, the second black printed layer includes a second logo area and a light-shielding area, the second logo area is used to transmit light, and the light-shielding area is used to shield light.

[0028] A second aspect of the present application provides a light-emitting device, which includes the heating film provided in the first aspect and the above embodiments.

[0029] In some embodiments, the light emitting device further comprises: a light source configured to emit light;

[0030] a lens, the lens being used to emit the light emitted by the light source from a light-emitting surface of the lens, the heating film being provided on a light-incident surface of the lens and being used to heat the lens, the light-emitting surface of the lens being provided opposite to the light-incident surface;

[0031] The light emitting device is used as a radar-compatible marker light.

[0032] A third aspect of the present application provides a motor vehicle comprising the lighting device provided in the second aspect.

[0033] In some embodiments, the motor vehicle further comprises: a radar detection device, the radar detection device being disposed on the rear side of the light emitting device and transmitting and receiving radar signals through the light emitting device; and

[0034] A camera device is disposed on the rear side of the light emitting device and is used to shoot videos or images through the light emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic structural diagram of a heating film provided in an embodiment of the present application;

[0036] Figure 2 for Figure 1 A schematic structural diagram of the heating film shown in another perspective;

[0037] Figure 3 for Figure 1 A front view of the heating film shown;

[0038] Figure 4 for Figure 1 A rear view of the heating membrane is shown;

[0039] Figure 5 for Figure 3 AA cross-sectional view of the heating film shown;

[0040] Figure 6 for Figure 5 A partial enlarged view of the heating film shown in FIG.

[0041] Figure 7 for Figure 1 An exploded view of the heating membrane is shown;

[0042] Figure 8 A schematic structural diagram of a light-emitting device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0043] The following is a detailed description of the embodiments of the present application in conjunction with the accompanying drawings. It should be understood that the embodiments of the present application are primarily intended to illustrate possible implementations of the technical solution of the present application and should not be construed as limiting the technical solution of the present application. In this specification, identical or similar components are indicated by identical or similar reference numerals.

[0044] Figure 1 A schematic structural diagram of a heating film 100 provided in an embodiment of the present application; Figure 2 for Figure 1 A schematic structural diagram of the heating film 100 shown in another perspective; Figure 3 for Figure 1 A front view of the heating film 100 is shown; Figure 4 for Figure 1 A rear view of the heating film 100 is shown; Figure 5 for Figure 3 AA cross-sectional view of the heating film 100 shown; Figure 6 for Figure 5 A partial enlarged view B of the heating film 100 is shown; Figure 7 for Figure 1 An exploded view of the heating film 100 is shown; Figure 8 A schematic structural diagram of a light emitting device 200 provided in an embodiment of the present application is shown, and a radar detection device 300 and a camera detection device 400 in a motor vehicle 1000 are also shown.

[0045] like Figure 1-8 As shown, an embodiment of the present application provides a heating film 100 that can be used in a light-emitting device 200. The heating film 100 can be used to heat the light-emitting device 200 to de-ice the light-emitting device 200, thereby improving the optical performance of the light-emitting device 200. In addition to the heating film 100, the light-emitting device 200 also includes a light source 210 and a lens 220. The light source 210 is used to emit light. The lens 220 includes a light-incident surface 221 and a light-exiting surface 222 disposed opposite each other. The lens 220 is disposed downstream of the light source 210 and is used to receive light emitted by the light source 210 from the light-incident surface 221 and emit the light from the light-exiting surface 222 of the lens 220. The heating film 100 can be disposed on the light-incident surface 221 of the lens 220 and is used to heat the lens 220 to melt ice on the outside of the lens 220, thus providing the light-emitting device 200 with a heating and de-icing function, thereby ensuring that the light-emitting device 200 can function normally even in cold weather. Specifically, the heating film 100 is injection-molded onto the lens 220 through an in-mold molding (IML) process. Alternatively, the heating film 100 is bonded onto the lens 220 .

[0046] When the light-emitting device 200 is used in a motor vehicle 1000, the light-emitting device 200 can be used as a logo lamp (LOGO Lamp) of the motor vehicle. In addition to the light-emitting device 200, the motor vehicle 1000 also includes a radar detection device 300 and a camera detection device. The radar detection device 300 can be arranged on the rear side of the light-emitting device 200 and transmit and receive radar signals through the light-emitting device 200. The camera device 400 can also be arranged on the rear side of the light-emitting device 200 and shoot videos or images through the light-emitting device 200. In addition to having a heating function, the light-emitting device of this embodiment can also take into account radar functions and camera functions.

[0047] The specific structure of the heating film 100 will be described in detail below.

[0048] In this embodiment, the heating film 100 includes a transparent base layer 10 and a heating circuit layer 20, wherein the base layer 10 is transparent, so its influence on the light emission is relatively low, and the base layer 10 is flexible, and the base layer 10 includes a first side surface 11 and a second side surface 12 arranged opposite to each other. The heating circuit layer 20 is directly attached to the second side surface 12 of the base layer 10, and the heating circuit layer 20 can generate heat when powered on. Since the base layer 10 is flexible, the heating film 100 can be configured to have a curved three-dimensional shape. For example, the first side surface 11 of the base layer 10 is configured to have a three-dimensional shape, that is, the first side surface 11 is not a plane, but a curved surface. Setting the base layer 10 to have a three-dimensional shape can better match the shape of the heating film 100 with the curved light incident surface 221 of the lens 220. Figure 1 From the perspective, the base layer 10 is circular as a whole, and the middle part of the base layer is convex toward the left side (the direction of light emission Z) compared to the outer part. Figure 1 In the figure, X is the horizontal direction and Y is the vertical direction. The horizontal direction X, the vertical direction Y, and the light emission direction Z are mutually perpendicular. When the lens 220 has other shapes, the heating film 100 can also be adaptively bent into a matching shape. In addition, due to the strong adhesion between the heating circuit layer 20 and the base layer 10, the heating circuit layer 20 can be directly attached to the base layer 10, resulting in a very reliable and strong connection between the two without the need for additional adhesives, which significantly reduces costs.

[0049] To ensure flexibility of the base layer 10, for example, a tensile modulus greater than or equal to 1500 MPa, or even greater than 2000 MPa or 2200 MPa, and strong adhesion between the base layer 10 and the heating circuit layer 20, for example, a metal adhesion greater than or equal to 4B or even greater than 5B, the base layer 10 can be manufactured using a blend of two plastics. Specifically, the base layer 10 can include a first plastic and a second plastic blended together, wherein the first plastic has a greater tensile modulus than the second plastic, and the second plastic has a greater metal adhesion than the first plastic. The greater tensile modulus of the first plastic enhances its flexibility, while the greater adhesion of the second plastic enhances its adhesion to the heating circuit layer 20. The base layer 10, made from a blend of the first and second plastics, combines the advantages of both: greater flexibility and improved adhesion to the heating circuit layer 20.

[0050] In some embodiments, the first plastic is polycarbonate (PC), which has a tensile modulus of 2200 MPa but low metal adhesion. The second plastic is polyethylene glycol terephthalate (PET), which has a metal adhesion greater than or equal to 5B but low tensile modulus. Using a mixture of PC and PET to form the base layer 10 ensures that the base layer 10 has a large tensile modulus and high metal adhesion. Moreover, both PC and PET have good light transmittance, and using a mixture of PC and PET to form the base layer 10 can simultaneously meet optical requirements. However, this application is not limited to PC and PET; other materials with similar properties can also be used as the first and second plastics. As long as the tensile modulus of the first plastic is greater than or equal to 1500 MPa, or even greater than or equal to 2000 MPa or 2200 MPa. The metal adhesion of the second plastic is greater than or equal to 4B, or even greater than or equal to 5B, and the light transmittance of the second plastic is greater than 80%. Both can be used to mix in a certain proportion to form the transparent base layer 10.

[0051] Due to the high tensile modulus of the first plastic, the base layer 10 comprising the first plastic is flexible as a whole, meaning that the base layer 10 can be bent into a three-dimensional shape. Specifically, the first side surface 11 of the base layer 10 is configured to have a three-dimensional shape, meaning that the first side surface 11 is a curved surface rather than a flat surface. Bending the base layer 10 into a 3D shape facilitates bonding with a 3D lens, resulting in a better appearance. Furthermore, the 3D shape of the lens helps keep the light-emitting device 200 clean, preventing problems such as water and dust accumulation.

[0052] Because the second plastic has a strong metal adhesion, the base layer 10 comprising the second plastic also has good metal adhesion, ensuring that the heating circuit layer 20 is well adhered to the base layer 10. Specifically, the heating circuit layer 20 is typically formed by sputtering a metal layer on the second side surface 12 of the base layer 10 and etching the metal layer. The metal heating layer 20 is tightly adhered to the base layer 10 by virtue of the adhesion between the metal heating layer 20 and the base layer 10.

[0053] The heating circuit layer 20 is usually transparent to avoid the heating circuit layer 20 having an adverse effect on the light output of the light-emitting device 200. The heating circuit layer 20 includes a pattern formed by conductive metal wires, and the size of the conductive metal wires is usually small to ensure that the entire heating circuit layer 20 is transparent. Specifically, the thickness of the conductive metal wires is less than 0.001 mm, for example, the thickness of the conductive metal wires is 0.001 mm. The line width of the conductive metal wires is less than or equal to 0.001 mm, for example, the line width of the conductive metal wires is 0.001 mm. The line spacing of the conductive metal wires is between 0.05-4 mm, for example, the line spacing of the conductive metal wires is 0.35 mm.

[0054] In addition to the base layer 10 and the heating circuit layer 20, the heating film 100 also includes a first white printed layer 30 and a first black printed layer 40. The first white printed layer 30 is attached to the side of the heating circuit layer 20 away from the base layer 10. The first white printed layer 30 can be formed by printing white paint, for example. White paint is opaque and is used to reflect light emitted by the light source so that the light is reflected to the required location, thereby improving the light efficiency. The first white printed layer 30 includes a first logo area 31 and a reflective area 32. The first logo area 31 is used to transmit light to form a luminous LOGO, and the reflective area 32 is used to reflect light. The first black printed layer 40 is attached to the second side 12 of the base layer 10 and is located on the periphery of the heating circuit layer 20. The black printed layer 40 can be formed by printing black paint. It is mainly used to block light and prevent light leakage from the light-emitting device 200.

[0055] The heating film 100 also includes a second white printed layer 50 and a second black printed layer 60. The second white printed layer 50 is attached to the first side surface 11 of the base layer 10. The second white printed layer is milky white or milky white, transmitting and diffusing light to improve the uniformity of light output when the light-emitting device 200 is on and avoid bright spots. It also conceals any blemishes when the light-emitting device 200 is off. The second black printed layer 60 is attached to the side of the second white printed layer 50 facing away from the base layer 10. The second black printed layer 60 can be formed from printed black paint, which is inherently light-blocking. The second black printed layer 60 includes a second logo area 61 that transmits light to form a luminous logo, and a light-blocking area 62 that blocks light to achieve a black appearance.

[0056] An embodiment of the present application further provides a light-emitting device 200 , which includes the heating film 100 described in any one of the above embodiments.

[0057] An embodiment of the present application further provides a motor vehicle 1000 , which includes the lighting device 200 described in any one of the above embodiments.

[0058] The heating circuit layer 20 in the heating film 100 is radar transparent, preventing the conductive metal wires in the heating circuit layer 20 from affecting the performance of the radar detection device 300. The portion of the heating film 100 corresponding to the window of the camera device 400 is transparent to prevent it from affecting the camera device 400's shooting function.

[0059] Although the present application is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the present application and are not to be construed as limiting the present application. The dimensions and proportions in the drawings are merely illustrative and are not to be construed as limiting the present application.

[0060] Although some embodiments of the overall concept of the present application have been shown and described, those skilled in the art will understand that the present application may include more other equivalent embodiments without departing from the overall inventive concept of the present application, and the scope of protection of the present application is defined by the claims.

Claims

1. A heating film (100), characterized in that: The heating film comprises: a transparent substrate (10), the substrate being flexible and comprising a first side (11) and a second side (12) disposed opposite to each other; and A heating circuit layer (20) is directly attached to the second side surface of the base layer.

2. The heating film according to claim 1, wherein The tensile modulus of the base layer is greater than or equal to 1500 MPa, and the metal adhesion of the base layer is greater than or equal to 4B.

3. The heating film according to claim 1, wherein The base layer (10) includes a first plastic and a second plastic mixed with each other; The tensile modulus of the first plastic is greater than that of the second plastic, and the metal adhesion of the second plastic is greater than that of the first plastic; The tensile modulus of the first plastic is greater than or equal to 1500 MPa, and the metal adhesion of the second plastic is greater than or equal to 4B.

4. The heating film according to claim 1, wherein The first plastic is polycarbonate, and the second plastic is polyethylene terephthalate.

5. The heating film according to claim 1, wherein The first side surface (11) of the base layer (10) is configured to have a three-dimensional shape. The heating film according to claim 1 , wherein: The heating circuit layer (20) is obtained by sputtering a metal layer on the second side surface (12) of the base layer (10) and etching the metal layer.

7. The heating film according to claim 1, wherein The heating circuit layer is transparent and includes a pattern formed by conductive metal wires; The thickness of the conductive metal wire is less than or equal to 0.001 mm; The conductive metal wire has a line width less than or equal to 0.001 mm; The line spacing of the conductive metal wires is between 0.05-4 mm.

8. The heating film according to claim 1, wherein The heating film is used to heat the lens; The heating film is injection molded onto the lens (220) through an in-mold injection molding process, or the heating film is bonded to the lens.

9. The heating film according to any one of claims 1 to 8, wherein The heating film further comprises a first white printed layer (30), the first white printed layer being attached to a side of the heating circuit layer (20) away from the base layer; and A first black printed layer (40) is attached to the second side surface (12) of the base layer and is located at the periphery of the heating circuit layer, and the black printed layer is used for light shielding.

10. The heating film according to claim 9, wherein: The first white printed layer (30) comprises a first logo area (31) and a light reflecting area (32), wherein the first logo area is used for transmitting light and the light reflecting area is used for reflecting light.

11. The heating film according to any one of claims 1 to 8, wherein The heating film further comprises a second white printed layer (50), the second white printed layer being attached to the first side surface (11) of the base layer, and the second white printed layer having the functions of transmitting and diffusing light; as well as A second black printing layer (60) is attached to a side of the second white printing layer away from the base layer.

12. The heating film according to claim 11, wherein: The second black printing layer comprises a second marking area (61) and a light-shielding area (62), wherein the second marking area is used for transmitting light, and the light-shielding area is used for shielding light.

13. A light emitting device (200), characterized in that: The lighting device comprises a heating film (100) according to any one of claims 1 to 12.

14. The light emitting device according to claim 13, wherein: The light emitting device further comprises: a light source (210), the light source being configured to emit light; a lens (220), the lens being used to emit light emitted by the light source from a light exiting surface (222) of the lens, the heating film being arranged on a light incident surface (221) of the lens and being used to heat the lens, the light exiting surface and the light incident surface of the lens being arranged opposite to each other; The light emitting device is used as a radar-compatible marker light.

15. A motor vehicle (1000), characterized in that The motor vehicle comprises a lighting device (200) according to any one of claims 13-14; a radar detection device (300), the radar detection device being arranged at the rear side of the light emitting device and transmitting and receiving radar signals through the light emitting device; as well as A camera device (400) is arranged on the rear side of the light emitting device and shoots videos or images through the light emitting device.

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