Capacitive touch sensing type car door with integrated heating and light emitting function

Abstract

The application discloses a kind of integrated heating and light-emitting function's capacitive touch sensing type car small door, including small door body, small door body is integrated with heating module, light-emitting module and capacitive sensing module;Heating module includes heating film piece, heating film piece at least has conductive circuit layer and heating layer, conductive circuit layer is used to connect power supply, so that heating layer is electrified and acts on outer panel;Light-emitting module includes the light-transmitting film piece being set on the outer surface of outer panel, and the light-emitting unit being set in accommodating cavity, light-transmitting film piece includes light-transmitting layer and pattern layer, pattern layer has openwork pattern part and the light-shielding part outside openwork pattern part, light emitted by light-emitting unit is projected to light-transmitting layer through openwork pattern part.The application integrates heating film piece, light-transmitting film piece and capacitive sensing assembly in small door body, simultaneously realizes the function of outer panel heating deicing, pattern light-emitting display and capacitive touch sensing, so that three kinds of functions reliably coexist in compact structure.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to a capacitive touch-sensitive automotive door that integrates heating and light-emitting functions. Background Technology

[0002] As automobiles become increasingly intelligent and electric, exposed components such as charging port doors and fuel filler doors are gradually being given more functions beyond basic shielding and protection. For example, in cold environments, the surface of these doors can easily become blocked by snow or ice, necessitating heating to ensure ease of use; illuminated markings are often added to improve visibility and aesthetics at night or in low light conditions; and capacitive touch sensors are being used to replace traditional mechanical pressing or remote control methods for keyless entry. However, current technology has yet to provide a solution that effectively integrates all three functions into a single door.

[0003] In conventional designs, achieving localized heating typically involves using independent heating elements such as resistance wires or PTC components. These elements are assembled as separate parts behind the panel, which not only takes up space but also results in uneven panel thickness and low heat conduction efficiency. If illuminated indicators and touch-sensing elements are then added on top of this, the stacking of multiple functional components further increases the structural thickness.

[0004] In particular, when the heating function is integrated as an independent rigid heating element, it is difficult to be compatible with the film structure required for light-transmitting display in terms of physical form and assembly method, making it difficult to form a thin, integrated functional panel. Summary of the Invention

[0005] This invention integrates a heating film, a light-transmitting film, and a capacitive sensing component into the main body of the door, thereby achieving the functions of heating and de-icing the outer panel, displaying illuminated patterns, and capacitive touch sensing, allowing these three functions to coexist reliably within a compact structure.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a capacitive touch-sensitive car door with integrated heating and light-emitting functions, comprising a door body, the door body comprising an outer panel and an inner back panel, the outer panel and the inner back panel at least partially covering each other and forming a receiving cavity between them, the door body integrating a heating module, a light-emitting module and a capacitive sensing module. The heating module includes a heating film disposed on the outer panel. The heating film has at least a conductive circuit layer and a heating layer. The conductive circuit layer is used to connect to the power supply, so that the heating layer is energized to generate heat and acts on the outer panel. The light-emitting module includes a light-transmitting film disposed on the outer surface of the outer panel and a light-emitting unit disposed in the receiving cavity. The light-transmitting film includes a light-transmitting layer and a pattern layer. The pattern layer has a hollowed-out pattern portion and a light-shielding portion located outside the hollowed-out pattern portion. The light emitted by the light-emitting unit projects the pattern onto the light-transmitting layer through the hollowed-out pattern portion. The capacitive sensing module includes a capacitive sensing component disposed within the receiving cavity, and a capacitive sensing area formed on the outer panel corresponding to the position of the capacitive sensing component.

[0007] By adopting the above technical solution, the heating function, lighting decoration function and touch sensing function are integrated into the small door body, so that the small door body can not only achieve basic protection, but also have multiple functions such as de-icing and snow melting, pattern display and touch control. This reduces the number of external additional parts, resulting in a compact structure and high functional integration.

[0008] A further configuration of the present invention is as follows: the outer panel includes an injection-molded substrate, the light-transmitting film is integrally formed on the outer surface of the injection-molded substrate by an IML process, and the heating film is integrally formed on the inner surface of the injection-molded substrate by an IME process.

[0009] By adopting the above technical solution, both the light-transmitting film and the heating film are integrally connected with the injection-molded substrate, the positions of each functional layer are clearly defined, the overall structure is stable, which helps to reduce the thickness of the assembly, and at the same time facilitates assembly and positioning.

[0010] A further feature of the present invention is that a positioning groove is provided at one end of the injection-molded substrate near the inner back plate, and the heating diaphragm is integrally formed in the positioning groove.

[0011] By adopting the above technical solution, the positioning groove provides a definite installation position for the heating film, which can prevent the heating film from shifting or delaminating during use, improve the bonding reliability between the heating film and the injection-molded substrate, and facilitate the directional conduction of heat to the outer panel surface.

[0012] A further feature of the present invention is that the heating diaphragm is fixed in the positioning groove by melting during the injection molding of the injection molding substrate.

[0013] By adopting the above technical solution, the fusion fixation method enables the substrate layer and the injection molded matrix to form a fusion bond with high bonding strength.

[0014] A further configuration of the present invention is that the inner back plate covers the central region of the outer panel, and the heating diaphragm is arranged in a ring around the receiving cavity.

[0015] By adopting the above technical solution, the ring-shaped arrangement concentrates the heating area around the perimeter of the outer panel, which can focus on heating the edge areas that are prone to snow accumulation and icing. At the same time, the central area is reserved to accommodate the light-emitting unit and capacitive sensing component, making the layout reasonable.

[0016] A further configuration of the present invention is as follows: the heating film includes a substrate layer, a conductive circuit layer formed of silver paste, and a heating layer formed of carbon paste, which are stacked sequentially. The conductive circuit layer forms a predetermined conductive path on the substrate layer, and the heating layer is at least partially stacked on the conductive circuit layer and electrically connected to the conductive circuit layer.

[0017] By adopting the above technical solution, the silver paste conductive circuit layer provides a conductive path, and the carbon paste heating layer generates heat when energized. Utilizing the resistance-temperature characteristics of the carbon paste material, the power can be automatically adjusted as the temperature rises during the heating process, achieving self-limitation of temperature without the need for external temperature control components.

[0018] A further feature of the present invention is that the heating film further includes an insulating layer and a scratch-resistant protective layer sequentially covering the heating layer.

[0019] By adopting the above technical solutions, the insulation layer can prevent the conductive circuit layer from contacting the outside world, reducing the risk of silver paste oxidation and short circuit; the scratch-resistant protective layer can improve the surface resistance to mechanical damage of the heating film and extend its service life.

[0020] A further feature of the present invention is that the light-shielding portion is formed by ink printing, and the hollow pattern portion is a hollow area that penetrates the light-shielding portion; The light-transmitting film is composed of a PMMA layer, a PC layer and the pattern layer stacked sequentially from the outside to the inside, and the PMMA layer and the PC layer constitute the light-transmitting layer; The injection molding substrate is made of a light-transmitting material, or the injection molding substrate has through holes corresponding to the hollowed-out pattern.

[0021] By adopting the above technical solution, the PMMA layer and PC layer provide surface hardness and toughness, and the pattern layer is wrapped between the film and the injection molding substrate, which can protect the pattern from wear, fading or peeling; the injection molding substrate is made of light-transmitting material or through holes to ensure that light can pass through the hollowed-out pattern from the inside to the outside.

[0022] A further feature of the present invention is that the color of the light-shielding part is the same as the color of the vehicle body.

[0023] By adopting the above technical solution, the color of the light-shielding part matches the body color, which allows the small door to blend into the body appearance when the lights are not turned on, reducing visual abruptness and achieving a hidden appearance effect.

[0024] A further embodiment of the present invention is that the light-emitting module further includes a light guide component disposed between the light-emitting unit and the outer panel. The light guide component includes a light-uniforming structure and a shaping structure. The light-uniforming structure and the shaping structure are two opposing surfaces on the same optical plate, or two separate independent plates. The light-uniforming structure is a compound eye lens array disposed on the light-incident end of the light guide component. The compound eye lens array is composed of multiple microlens units arranged side by side. The surface of each microlens unit is composed of crisscrossing and undulating stripes. The surface of the shaping structure has a gravel texture.

[0025] By adopting the above technical solution, the uniform light structure is a compound eye lens array, which can divide the light from the light-emitting unit into multiple uniform beams; the surface of the shaped structure has a gravel texture, which can cause the beam to produce multi-directional diffuse reflection and refraction; the combination of the two makes the light uniformly distributed and output from the hollowed-out pattern section, presenting the visual effect of multiple scattered light points.

[0026] In summary, the present invention has the following beneficial effects: 1. The heating diaphragm of the heating module is a membrane structure, located on the inner surface of the outer panel and outside the cavity formed by the outer panel and the inner back panel. The light-emitting unit and the capacitive sensing component of the light-emitting module are located inside the cavity. The light-transmitting diaphragm is a membrane structure, located on the outer surface of the outer panel. Therefore, the heating module, the light-emitting module and the capacitive sensing module are integrated on the small door body, realizing the coordinated arrangement of the three functions in a limited space, which is beneficial to the vehicle assembly and weight reduction.

[0027] 2. The heating diaphragm uses carbon paste as the heating layer material. It utilizes the PTC characteristic of carbon paste, which increases resistance with increasing temperature. At low temperatures, the resistance is low and the heating is fast. After reaching the set temperature range, the resistance automatically increases and the power decreases, thus achieving temperature self-regulation. This method does not require additional temperature sensors or control circuits, which reduces system complexity and manufacturing costs while preventing overheating.

[0028] 3. The patterned layer of the light-transmitting film is covered by PMMA and PC layers and placed between the injection-molded substrate and the film, without direct contact with the outside world. It has the characteristics of being wear-resistant, corrosion-resistant, non-peeling, and colorfast. There is no exposed paint on the surface, and the production process reduces the use of organic solvents, making it more environmentally friendly. The color of the light-shielding part can be matched with the car body, presenting a hidden appearance when not illuminated.

[0029] 4. The light is uniformly processed by a compound eye lens array and then scattered in multiple directions through the gravel textured surface. When the light shines through the hollow pattern, it presents a multi-point distribution and flashing visual effect. Combined with the dynamic change function of the RGB light-emitting unit, different modes of light display can be realized, which enhances the decoration and recognizability of the small door. Attached Figure Description

[0030] Figure 1 This is a perspective view of the front of the invention.

[0031] Figure 2 This is a perspective view of the back of the invention.

[0032] Figure 3 This is a cross-sectional view of the present invention.

[0033] Figure 4 This is the present invention. Figure 3 Enlarged view of point A in the middle.

[0034] Figure 5 This is a schematic diagram showing the structural composition of the light-transmitting film of the present invention and its positional relationship with the injection-molded substrate.

[0035] Figure 6 This is a cross-sectional view of the heating film of the present invention after omitting the insulating layer and the scratch-resistant protective layer.

[0036] Figure 7 This is an exploded view of the heating diaphragm of the present invention.

[0037] Figure 8 This is a physical diagram of the heating film of the present invention after omitting the insulating layer and the scratch-resistant protective layer.

[0038] Figure 9 This is a schematic diagram of the pattern layer of the present invention.

[0039] Figure 10 This is a schematic diagram illustrating the light guide component of the present invention.

[0040] Figure 11 This is a detailed view of the uniform light structure of the present invention.

[0041] In the diagram: 1. Small door body; 100. Receiving cavity; 11. Outer panel; 111. Injection molded substrate; 1111. Positioning groove; 12. Inner back panel; 21. Heating film; 211. Conductive circuit layer; 212. Heating layer; 213. Substrate layer; 214. Insulating layer; 215. Scratch-resistant protective layer; 31. Light-transmitting film; 311. Light-transmitting layer; 3111. PMMA layer; 3112. PC layer; 312. Pattern layer; 3121. Hollowed-out pattern section; 3122. Light-shielding section; 32. Light-emitting unit; 33. Light guide assembly; 34. Light uniform structure; 341. Microlens unit; 3411. Stripes; 35. Shape structure; 351. Pebble texture; 41. Capacitive sensing area. Detailed Implementation

[0042] The invention will now be further described with reference to the accompanying drawings.

[0043] A capacitive touch-sensitive car door integrating heating and light-emitting functions, such as Figure 1-3As shown, the door includes a small door body 1, which comprises an outer panel 11 and an inner back panel 12. The inner back panel 12 covers the central area of ​​the outer panel 11, forming a receiving cavity 100 between them. The outer panel 11 includes an injection-molded substrate 111, and the inner back panel 12 covers the central area of ​​the outer panel 11, forming a receiving cavity 100 between them for installing various functional components. The small door body 1 integrates three major functional modules: a heating module, a light-emitting module, and a capacitive sensing module. These modules work together to achieve de-icing and snow melting, dynamic lighting decoration, and touch interactive control within a limited space.

[0044] Heating module like Figures 2-4 As shown, the heating module includes a heating diaphragm 21 disposed on the outer panel 11; the heating diaphragm 21 is annular and arranged around the receiving cavity 100 on the inner surface of the injection molding substrate 111, and an annular positioning groove 1111 is provided on the back of the injection molding substrate 111, and the heating diaphragm 21 is integrally formed in the positioning groove 1111.

[0045] like Figures 6-8 As shown, the heating film 21 has a multi-layer composite structure, including a substrate layer 213, a conductive circuit layer 211, a heating layer 212, an insulating layer 214, and a scratch-resistant protective layer 215. The substrate layer 213 is a PET film, serving as the carrier base. The conductive circuit layer 211 is formed by printing silver paste, forming a pre-defined conductive path on the substrate layer 213. The heating layer 212 is formed by printing PTC carbon paste, at least partially superimposed on the conductive circuit layer 211 and electrically connected to it. The insulating layer 214 is black ink, covering the heating layer 212, used to protect the circuit and isolate it from air. The scratch-resistant protective layer 215 is UV-cured ink, disposed on the outermost layer.

[0046] The heating film 21 is manufactured using the IME process: the substrate layer 213 film is placed into the mold cavity of the injection mold in advance, and then injection molding is performed to form the injection substrate 111. The high-temperature molten plastic is fused with the surface of the substrate layer 213, so that the substrate layer 213 is embedded in the positioning groove 1111 and forms an integral part with the injection substrate 111. After injection molding is completed, the conductive circuit layer 211 (silver paste), the heating layer 212 (PTC carbon paste), the insulating layer 214 (black ink), and the scratch-resistant protective layer 215 (UV-curable ink) are sequentially screen printed on the surface of the substrate layer 213.

[0047] When powered on, the conductive circuit layer 211 is connected to the power supply, which causes the heating layer 212 to generate heat and conduct it to the outer panel 11. The resistance of the PTC carbon paste used in the heating layer 212 has a positive temperature coefficient characteristic as the temperature changes. That is, the initial resistance is small at lower temperatures, and it can heat up quickly after being powered on. When the temperature rises to the set range, the resistance increases and the heating power decreases accordingly. This characteristic enables the carbon paste material to achieve self-temperature regulation without the need for external temperature control devices.

[0048] Light-emitting module like Figures 1-4 As shown, the light-emitting module includes a light-transmitting film 31 and a light-emitting unit 32; the light-transmitting film 31 is disposed on the outer surface of the injection molding substrate 111; the light-emitting unit 32 is installed in the receiving cavity 100, and the light emitted by the light-emitting unit 32 passes through the injection molding substrate 111 and illuminates the light-transmitting film 31.

[0049] like Figure 5 and Figure 9 As shown, the light-transmitting film 31 is a multi-layer composite film, consisting of a PMMA layer 3111, a PC layer 3112, and a pattern layer 312 from the outside to the inside. The PMMA layer 3111 and the PC layer 3112 constitute the light-transmitting layer 311. The pattern layer 312 is formed by ink printing and includes a light-shielding part 3122 and a hollowed-out pattern part 3121. The light-shielding part 3122 is a non-transparent area formed by the printed ink, and the hollowed-out pattern part 3121 is a hollowed-out area that penetrates the light-shielding part 3122 to form the desired pattern shape. The pattern layer 312 is covered between the PC layer 3112 and the injection molding substrate 111.

[0050] The light-transmitting film 31 is manufactured using the IML process: a PMMA / PC composite film is taken, a pattern layer 312 is screen-printed on its back, it is positioned by CCD punching, and then it is high-pressure molded to obtain a three-dimensional shape. After the shape is punched out, it is placed into an injection mold and combined with molten plastic to form an injection-molded substrate 111. Finally, the excess parts are removed by precision carving and inspection is performed. The color of the light-shielding part 3122 of the pattern layer 312 can be adjusted by adding color powder to the ink and controlled by comparing the Lab value with a colorimeter to make it consistent with the body color.

[0051] Preferably, such as Figure 3 , Figure 10 and Figure 11 As shown, the light-emitting module also includes a light guide component 33 installed in the receiving cavity 100. The light guide component 33 is disposed between the light-emitting unit 32 and the outer panel 11. The light emitted by the light-emitting unit 32 passes through the light guide component 33 and then through the injection-molded substrate 111 to illuminate the light-transmitting film 31. The light guide component 33 includes a light-uniform structure 34 and a shaping structure 35. The light-uniform structure 34 is a compound eye lens array disposed on the light-incident end face, which is composed of multiple microlens units 341 arranged side by side. The surface of each microlens unit 341 has crisscrossing and wavy stripes 3411. The shaping structure 35 is a structure disposed on the light-emitting end face, and the surface has a gravel texture 351.

[0052] Preferably, the light-emitting unit 32 adopts an RGB LED light source, which can realize dynamic changes such as color switching, breathing or flowing water under driving control. This is existing technology and will not be described in detail here.

[0053] During operation, the light emitted by the light-emitting unit 32 first enters the uniform light structure 34, is divided into multiple uniform light beams by the compound eye lens array, and then undergoes multi-directional diffuse reflection and refraction through the gravel texture 351 of the shaped structure 35. Finally, it passes through the injection-molded substrate 111 and shines onto the pattern layer 312, and shines out from the hollow pattern part 3121. The hollow pattern part 3121 can be a number of dense and disordered holes. After the light passes through the above structure, it can present a multi-point starlight twinkling effect at the hollow pattern part 3121.

[0054] Capacitive sensing module The capacitive sensing module includes a capacitive sensing component and a capacitive sensing area 41. The capacitive sensing component is installed within the receiving cavity 100 and can be configured as an independent sensing electrode. The capacitive sensing area is the surface area on the outer panel 11 corresponding to the position of the capacitive sensing component. This area is a flat surface of the outer panel 11 without through holes or mechanical buttons. When a human body approaches or touches the capacitive sensing area, the capacitive sensing component detects a change in capacitance and outputs a signal that can be used to control the unlocking of the small door, switching of lighting modes, or starting / stopping of the heating function.

[0055] It is worth noting that the terms PET (polyethylene terephthalate), PMMA (polymethyl methacrylate), PTC (positive temperature coefficient), PC (polycarbonate), UV (ultraviolet light), IME (in-mold electronics), IML (in-mold labeling), CCD (charge-coupled device), Lab (CIELAB color model), and RGB LED (color light-emitting diode) mentioned above are all common names in the existing technology, so we will not go into too much detail about the specific materials, processes, and technical contents.

[0056] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A capacitive touch-sensitive car door with integrated heating and light-emitting functions, comprising a door body (1), the door body (1) comprising an outer panel (11) and an inner back panel (12), the outer panel (11) and the inner back panel (12) at least partially covering each other and forming a receiving cavity (100) between them, characterized in that: The small door body (1) integrates a heating module, a light-emitting module and a capacitive sensing module; The heating module includes a heating film (21) disposed on the outer panel (11). The heating film (21) has at least a conductive circuit layer (211) and a heating layer (212). The conductive circuit layer (211) is used to connect the power supply, so that the heating layer (212) is energized to generate heat and act on the outer panel (11). The light-emitting module includes a light-transmitting film (31) disposed on the outer surface of the outer panel (11) and a light-emitting unit (32) disposed in the receiving cavity (100). The light-transmitting film (31) includes a light-transmitting layer (311) and a pattern layer (312). The pattern layer (312) has a hollowed-out pattern portion (3121) and a light-shielding portion (3122) located outside the hollowed-out pattern portion (3121). The light emitted by the light-emitting unit (32) projects the pattern onto the light-transmitting layer (311) through the hollowed-out pattern portion (3121). The capacitive sensing module includes a capacitive sensing component disposed in the receiving cavity (100) and a capacitive sensing area (41) formed on the outer panel (11) and corresponding to the position of the capacitive sensing component.

2. The capacitive touch-sensitive car door with integrated heating and light-emitting functions according to claim 1, characterized in that: The outer panel (11) includes an injection-molded substrate (111), the light-transmitting film (31) is integrally formed on the outer surface of the injection-molded substrate (111) by the IML process, and the heating film (21) is integrally formed on the inner surface of the injection-molded substrate (111) by the IME process.

3. A capacitive touch-sensitive car door integrating heating and light-emitting functions according to claim 2, characterized in that: The injection-molded substrate (111) has a positioning groove (1111) at one end near the inner back plate (12), and the heating diaphragm (21) is integrally formed in the positioning groove (1111).

4. A capacitive touch-sensitive car door with integrated heating and light-emitting functions according to claim 3, characterized in that: The heating diaphragm (21) is fixed in the positioning groove (1111) by melting during the injection molding of the injection molding substrate (111).

5. A capacitive touch-sensitive car door with integrated heating and light-emitting functions as described in claim 1, characterized in that: The inner back panel (12) covers the central region of the outer panel (11), and the heating diaphragm (21) is arranged in a ring around the receiving cavity (100).

6. A capacitive touch-sensitive car door with integrated heating and light-emitting functions according to any one of claims 1-5, characterized in that: The heating film (21) includes a substrate layer (213), a conductive circuit layer (211) formed of silver paste, and a heating layer (212) formed of carbon paste, which are stacked in sequence. The conductive circuit layer (211) forms a preset conductive path on the substrate layer (213). The heating layer (212) is at least partially stacked on the conductive circuit layer (211) and forms an electrical connection with the conductive circuit layer (211).

7. A capacitive touch-sensitive car door with integrated heating and light-emitting functions as described in claim 6, characterized in that: The heating film (21) also includes an insulating layer (214) and a scratch-resistant protective layer (215) sequentially covering the heating layer (212).

8. A capacitive touch-sensitive car door with integrated heating and light-emitting functions according to claim 2, characterized in that: The light-shielding part (3122) is formed by ink printing, and the hollow pattern part (3121) is a hollow area that penetrates the light-shielding part (3122); The light-transmitting film (31) has a PMMA layer (3111), a PC layer (3112) and the pattern layer (312) stacked sequentially from the outside to the inside. The PMMA layer (3111) and the PC layer (3112) constitute the light-transmitting layer (311). The injection molding substrate (111) is made of a light-transmitting material, or the injection molding substrate (111) has through holes corresponding to the hollow pattern part (3121).

9. A capacitive touch-sensitive car door with integrated heating and light-emitting functions as described in claim 8, characterized in that: The color of the light-shielding part (3122) is the same as the body color.

10. A capacitive touch-sensitive car door with integrated heating and light-emitting functions according to claim 1, characterized in that: The light-emitting module also includes a light guide assembly (33) disposed between the light-emitting unit (32) and the outer panel (11). The light guide assembly (33) includes a light-uniform structure (34) and a shape structure (35). The light-uniform structure (34) and the shape structure (35) are two opposing surfaces on the same optical plate, or two separate independent plates. The light-uniform structure (34) is a compound eye lens array disposed on the light-incident end of the light guide assembly (33). The compound eye lens array is composed of multiple microlens units (341) arranged side by side. The surface of each microlens unit (341) is composed of crisscrossing and wavy stripes (3411). The surface of the shape structure (35) has gravel texture (351).

Images