Heating film, light-emitting device and motor vehicle

Abstract

The present application provides a heating film (100), comprising: a transparent base layer (10), the base layer being flexible and comprising a first side face (11) and a second side face (12) arranged opposite each other; and a heating circuit layer (20) directly adhered to the second side face of the base layer.

Description

Heating film, light-emitting device and motor vehicle

[0001] The present application relates to the technical field of lighting, in particular to a heating film, a light-emitting device and a motor vehicle.

[0002] In the field of lighting, various lighting or signalling devices are known for providing light for lighting or signalling. For example, vehicle lamps are used in motor vehicles to provide lighting or signalling functions, so as to ensure safe travel, or to provide decorative functions.

[0003] However, in cold weather, when the surface of a vehicle lamp is covered in ice, the function of the vehicle lamp will not be able to be used effectively. Currently known vehicle lamps with heating functionality generally have quite a conspicuous shape and are difficult to match to the shape of the vehicle body; this not only affects appearance, but may also affect the function of the vehicle lamp and thus pose a risk to safety when driving.

[0004] Thus, there is really an urgent need at present to improve component design in existing vehicle lamps and thus propose a novel light-emitting device to overcome the shortcomings in the prior art.Summary of the Invention

[0005] An objective of the present application is to overcome at least one of the problems and shortcomings 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 face and a second side face arranged opposite each other; and

[0008] a heating circuit layer directly adhered to the second side face 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 comprises a first plastic and a second plastic mixed with one another;

[0011] the first plastic has a greater tensile modulus than the second plastic, and the second plastic has greater metal adhesion than 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 face 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 face of the base layer and etching the metal layer.

[0016] In some embodiments, the heating circuit layer is transparent, and comprises a pattern formed of electrically conductive metal wire;

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

[0018] the wire width of the electrically conductive metal wire is less than or equal to 0.001 mm;

[0019] the wire separation of the electrically conductive metal wire is 0.05 - 4 mm.

[0020] In some embodiments, the heating film is used for heating a lens;

[0021] the heating film is injection-moulded onto the lens by an in-mould injection moulding process, or the heating film is bonded to the lens.

[0022] In some embodiments, the heating film further comprises a first white printed layer, the first white printed layer being adhered to a side face of the heating circuit layer that is remote from the base layer; and

[0023] a first black printed layer, the first black printed layer being adhered to the second side face of the base layer, and located at the periphery of the heating circuit layer, and used for blocking light.

[0024] In some embodiments, the first white printed layer comprises a first logo region and a light-reflecting region, the first logo region being configured to transmit light, and the light-reflecting region being configured to reflect light.

[0025] In some embodiments, the heating film further comprises a second white printed layer adhered to the first side face of the base layer, the second white printed layer having the effects of transmitting light and diffusing light; and

[0026] a second black printed layer, adhered to a side face of the second white printed layer that is remote from the base layer.

[0027] In some embodiments, the second black printed layer comprises a second logo region and a light-blocking region, the second logo region being configured to transmit light, and the light-blocking region being configured to block light.

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

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

[0030] a lens, configured to output, through a light exit face of the lens, light emitted by the light source, the heating film being arranged on a light entry face of the lens and configured to heat the lens, and the light exit face and light entry face of the lens being arranged opposite each other;

[0031] the light-emitting device being used as a radar-compatible logo lamp.

[0032] A third aspect of the present application provides a motor vehicle, comprising a light-emitting device as provided in the second aspect.

[0033] In some embodiments, the motor vehicle further comprises: a radar detection device, which is arranged at a rear side of the light-emitting device, and transmits and receives radar signals through the light-emitting device; and

[0034] a camera device, which is arranged at the rear side of the light-emitting device and captures video or images through the light-emitting device.Brief Description of the Drawings

[0035] is a schematic view of the structure of a heating film provided in an embodiment of the present application;

[0036] is a schematic view of the structure of the heating film shown in, viewed from another angle;

[0037] is a front view of the heating film shown in;

[0038] is a rear view of the heating film shown in;

[0039] is a cross-sectional view A-A of the heating film shown in;

[0040] is an enlarged view B of a portion of the heating film shown in;

[0041] is an exploded view of the heating film shown in;

[0042] shows a schematic view of the structure of a light-emitting device provided in an embodiment of the present application.Detailed Description of the Invention

[0043] Embodiments of the present application will be described in detail below with reference to the drawings. It should be understood that these embodiments of the present application are mainly possible embodiments intended to illustrate the technical solution of the present application, and should not be interpreted as limitations of the technical solution of the present application. In this Description, identical or similar components are indicated with identical or similar reference numerals.

[0044] is a schematic view of the structure of a heating film 100 provided in an embodiment of the present application;is a schematic view of the structure of the heating film 100 shown in, viewed from another angle;is a front view of the heating film 100 shown in;is a rear view of the heating film 100 shown in;is a cross-sectional view A-A of the heating film 100 shown in;is an enlarged view B of a portion of the heating film 100 shown in;is an exploded view of the heating film 100 shown in;shows a schematic view of the structure of a light-emitting device 200 provided in an embodiment of the present application, and additionally shows a radar detection device 300 and a camera detection device 400 in a motor vehicle 1000.

[0045] As shown in Figs. 1 - 8,embodiments of the present application provide a heating film 100, wherein the heating film 100 can be used for a light-emitting device 200; the heating film 100 can be used for heating the light-emitting device 200, so as to de-ice the light-emitting device 200, thereby improving the optical performance of the light-emitting device 200. The light-emitting device 200 comprises, in addition to the heating film 100, a light source 210 and a lens 220. The light source 210 is configured to emit light. The lens 220 comprises a light entry face 221 and a light exit face 222 arranged opposite each other; the lens 220 is arranged downstream of the light source 210, and the lens 220 is configured to receive, through the light entry face 221, light emitted by the light source 210, and output the light through the light exit face 222 of the lens 220. The heating film 100 may be arranged on the light entry face 221 of the lens 220, and is configured to heat the lens 220 so as to melt ice on an outer side of the lens 220, such that the light-emitting device 200 has heating and de-icing functionality, thereby ensuring that the light-emitting device 200 can be used normally even in cold weather. Specifically, the heating film 100 is injection-moulded onto the lens 220 by an in-mould injection moulding process (IML). Alternatively, the heating film 100 is bonded to the lens 220.

[0046] When the light-emitting device 200 is used on a motor vehicle 1000, the light-emitting device 200 may be used as a LOGO lamp of the motor vehicle. In addition to the light-emitting device 200, the motor vehicle 1000 further comprises a radar detection device 300 and a camera detection device. The radar detection device 300 may be disposed at a rear side of the light-emitting device 200, and transmits and receives radar signals through the light-emitting device 200. The camera device 400 may also be disposed at the rear side of the light-emitting device 200, and captures video or images through the light-emitting device 200. In addition to having a heating function, the light-emitting device of this embodiment may also have a radar function and a camera function.

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

[0048] In this embodiment, the heating film 100 comprises a transparent base layer 10 and a heating circuit layer 20, wherein the base layer 10 is transparent, so that its effect on light output is low, and the base layer 10 is flexible; and the base layer 10 comprises a first side face 11 and a second side face 12 which are disposed opposite each other. The heating circuit layer 20 is directly adhered to the second side face 12 of the base layer 10, and the heating circuit layer 20 can emit heat when energized. Since the base layer 10 is flexible, the heating film 100 may be configured to have a curved three-dimensional shape; for example, the first side face 11 of the base layer 10 is configured to have a three-dimensional shape, i.e. the first side face 11 is not a flat surface, but a curved surface. Configuring the base layer 10 to have a three-dimensional shape enables a better match between the shapes of the heating film 100 and the curved light entry face 221 of the lens 220. When viewed at the angle of, the base layer 10 is circular overall, and a middle portion of the base layer projects towards the left side (in a light output direction Z) with respect to a peripheral portion; in, X is the transverse direction, and Y is the vertical direction; and the transverse direction X, the vertical direction Y and the light output direction Z are perpendicular to each other. When the lens 220 has another shape, the heating film 100 may also be adaptively bent into a matching shape. Furthermore, since there is a large adhesive force between the heating circuit layer 20 and the base layer 10, the heating circuit layer 20 can be directly adhered to the base layer 10; the connection therebetween is very reliable and secure, and requires no additional adhesive, which significantly reduces costs.

[0049] In order to make the base layer 10 flexible, for example such that the tensile modulus of the base layer 10 is greater than or equal to 1500 MPa, or even greater than 2000 MPa or 2200 MPa, while ensuring a large adhesive force between the base layer 10 and the heating circuit layer 20, for example such that the metal adhesion of the base layer 10 is greater than or equal to 4B, or even greater than 5B, the base layer 10 can be made from a material that mixes two plastics. Specifically, the base layer 10 may comprise a first plastic and a second plastic mixed with each other, the first plastic having a greater tensile modulus than the second plastic, and the second plastic having greater metal adhesion than the first plastic. Since the first plastic has a greater tensile modulus, the first plastic has better flexibility; and since the second plastic has a greater adhesive force, the second plastic is easier to bond to the heating circuit layer 20. Since the base layer 10 is made of a mixture of the first plastic and the second plastic, the base layer 10 has advantages of both plastics, namely, better flexibility and better adhesion to the heating circuit layer 20.

[0050] In some embodiments, the first plastic is polycarbonate (PC); polycarbonate has a tensile modulus of 2200 MPa, but its metal adhesion is low. The second plastic is polyethylene glycol terephthalate (PET), which has metal adhesion greater than or equal to 5B, but a low tensile modulus. The use of a mixture of PC and PET to make the base layer 10 can ensure that the tensile modulus of the base layer 10 is high and the metal adhesion thereof is large. Moreover, both PC and PET have good light transmittance, so the use of a mixture of PC and PET to make the base layer 10 can also meet optical requirements. However, the present application is not limited to the two materials PC and PET; other materials with similar properties may also be used as the first plastic and the second plastic. 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, and 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 both plastics is greater than 80%, they can be mixed in a certain ratio to make 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 overall, i.e. the base layer 10 can be bent into a three-dimensional shape. In particular, the first side face 11 of the base layer 10 is configured to have a three-dimensional shape, i.e. the first side face 11 is a curved surface, not a flat surface. Having the base layer 10 bent into a 3D shape facilitates fitting to the lens which has a 3D shape, and results in a better appearance; moreover, the lens with the 3D shape helps to keep the light-emitting device 200 clean, avoiding problems such as water and dust accumulation.

[0052] Since the metal adhesion of the second plastic is large, the base layer 10 comprising the second plastic also has better metal adhesion, to ensure that the heating circuit layer 20 is adhered to the base layer 10 better. In particular, the heating circuit layer 20 is generally obtained by sputtering a metal layer on the second side face 12 of the base layer 10 and etching the metal layer, the metal heating layer 20 being closely adhered to the base layer 10 by virtue of adhesion to the base layer 10.

[0053] The heating circuit layer 20 is generally transparent, so that the heating circuit layer 20 does not have an adverse impact on light output from the light-emitting device 200. The heating circuit layer 20 comprises a pattern formed of electrically conductive metal wire, the dimensions of the electrically conductive metal wire generally being small to ensure that the entire heating circuit layer 20 is transparent. Specifically, the thickness of the electrically conductive metal wire is less than 0.001 mm; for example, the thickness of the electrically conductive metal wire is 0.001 mm. The wire width of the electrically conductive metal wire is less than or equal to 0.001 mm; for example, the wire width of the electrically conductive metal wire is 0.001 mm. The wire separation of the electrically conductive metal wire is 0.05 - 4 mm; for example, the wire separation of the electrically conductive metal wire is 0.35 mm.

[0054] In addition to the base layer 10 and the heating circuit layer 20, the heating film 100 further comprises a first white printed layer 30 and a first black printed layer 40. The first white printed layer 30 is adhered to a side face of the heating circuit layer 20 that is remote from the base layer 10; the first white printed layer 30 may be formed, for example, by printing with white paint, which is opaque and serves to reflect light emitted by the light source, in order to reflect the light to a required place and thus improve optical efficiency. The first white printed layer 30 comprises a first logo region 31 and a light-reflecting region 32, the first logo region 31 being configured to transmit light to form a light-emitting LOGO, and the light-reflecting region 32 being configured to reflect light. The first black printed layer 40 is adhered to the second side face 12 of the base layer 10 and located at the periphery of the heating circuit layer 20; the black printed layer 40 may be formed by printing with black paint, and is mainly used to block light, to avoid light leakage from the light-emitting device 200.

[0055] In addition, the heating film 100 further comprises a second white printed layer 50 and a second black printed layer 60. The second white printed layer 50 is adhered to the first side face 11 of the base layer 10, the second white printed layer being cream or milky white, and having the effects of transmitting light and diffusing light, to improve the uniformity of light output when the light-emitting device 200 is illuminated, and avoid bright spots; and also having the function of covering up ugliness when the light-emitting device 200 is not illuminated. The second black printed layer 60 is adhered to a side face of the second white printed layer 50 that is remote from the base layer 10; the second black printed layer 60 may be formed of printed black paint, which is itself light-blocking. The second black printed layer 60 comprises a second logo region 61 and a light-blocking region 62, wherein the second logo region 61 is configured to transmit light to form a light-emitting LOGO; and the light-blocking region 62 is configured to block light, so as to achieve a black appearance.

[0056] Embodiments of the present application also provide a light-emitting device 200, comprising the heating film 100 described in any one of the embodiments above.

[0057] Embodiments of the present application also provide a motor vehicle 1000, which comprises the light-emitting device 200 described in any one of the embodiments above.

[0058] The heating circuit layer 20 in the heating film 100 is radar permeable, so the electrically conductive metal wire in the heating circuit layer 20 does not affect the performance of the radar detection device 300. A position within the heating film 100 corresponding to a window of the camera device 400 is transparent, avoiding any impact on the capturing function of the camera device 400.

[0059] Although the present application has been explained with reference to the drawings, the embodiments disclosed in the drawings are intended to provide an exemplary explanation of preferred implementations of the present application, and must not be construed as limiting the present application. The dimensional proportions in the drawings are merely schematic, and must not be construed as limiting the present application.

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

Claims

Heating film (100), characterized in that the heating film comprises:a transparent base layer (10), the base layer being flexible and comprising a first side face (11) and a second side face (12) arranged opposite each other; anda heating circuit layer (20) directly adhered to the second side face of the base layer.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.Heating film according to Claim 1, wherein the base layer (10) comprises a first plastic and a second plastic mixed with one another;the first plastic has a greater tensile modulus than the second plastic, and the second plastic has greater metal adhesion than 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.Heating film according to Claim 1, wherein the base layer (10) comprises a first plastic and a second plastic mixed with one another;the first plastic is polycarbonate(PC), and the second plastic is polyethylene terephthalate(PET).Heating film according to Claim 1, wherein the first side face (11) of the base layer (10) is configured to have a three-dimensional shape.Heating film according to Claim 1, wherein the heating circuit layer (20) is obtained by sputtering a metal layer on the second side face (12) of the base layer (10) and etching the metal layer.Heating film according to Claim 1, wherein the heating circuit layer is transparent, and comprises a pattern formed of electrically conductive metal wire;the thickness of the electrically conductive metal wire is less than or equal to 0.001 mm;the wire width of the electrically conductive metal wire is less than or equal to 0.001 mm;the wire separation of the electrically conductive metal wire is 0.05 - 4 mm.Heating film according to Claim 1, wherein the heating film is used for heating a lens;the heating film is injection-moulded onto the lens (220) by an in-mould injection moulding process, or the heating film is bonded to the lens.Heating film according to any one of Claims 1 - 8, wherein the heating film further comprises a first white printed layer (30), the first white printed layer being adhered to a side face of the heating circuit layer (20) that is remote from the base layer; anda first black printed layer (40), the first black printed layer being adhered to the second side face (12) of the base layer, and located at the periphery of the heating circuit layer, and used for blocking light.Heating film according to Claim 9, wherein the first white printed layer (30) comprises a first logo region (31) and a light-reflecting region (32), the first logo region being configured to transmit light, and the light-reflecting region being configured to reflect light.Heating film according to any one of Claims 1 - 8, wherein the heating film further comprises a second white printed layer (50) adhered to the first side face (11) of the base layer, the second white printed layer having the effects of transmitting light and diffusing light; anda second black printed layer (60), adhered to a side face of the second white printed layer that is remote from the base layer.Heating film according to Claim 11, wherein the second black printed layer comprises a second logo region (61) and a light-blocking region (62), the second logo region being configured to transmit light, and the light-blocking region being configured to block light.Light-emitting device (200), characterized in that the light-emitting device comprises the heating film (100) according to any one of Claims 1 - 12.Light-emitting device according to Claim 13, wherein the light-emitting device further comprises: a light source (210) configured to emit light;a lens (220), configured to output, through a light exit face (222) of the lens, light emitted by the light source, the heating film being arranged on a light entry face (221) of the lens and configured to heat the lens, and the light exit face and light entry face of the lens being arranged opposite each other;the light-emitting device being used as a radar-compatible logo lamp.Motor vehicle (1000), characterized in that the motor vehicle comprises the light-emitting device (200) according to any one of Claims 13 - 14;a radar detection device (300), which is arranged at a rear side of the light-emitting device, and transmits and receives radar signals through the light-emitting device; anda camera device (400), which is arranged at the rear side of the light-emitting device and captures video or images through the light-emitting device.

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