Heating film and equipment with heating function

Abstract

The utility model provides a heating film and equipment with a heating function, and relates to the technical field of heating films. The heating film comprises an insulating film base material, a resistance wire, a temperature control switch and a leading-out wire, the resistance wire and the temperature control switch are arranged on the insulating film base material, the leading-out wire, the resistance wire and the temperature control switch are connected in series, and at least part of the leading-out wire is located outside the edge of the insulating film base material. The heating film comprises the resistance wire and the temperature control switch which are both arranged on the insulating film base material, integrates heating and temperature measurement and control functions, and is small in occupied space and convenient to arrange when being applied to heated equipment.

Description

Technical Field

[0001] This utility model relates to the field of heating film technology, and more specifically, to a heating film and a device with heating function. Background Technology

[0002] Heating films are thin heating elements, typically composed of resistive and insulating materials, capable of generating heat through an electric current. They are widely used in various fields due to their lightweight, flexibility, and efficient heating performance, including electronics, automotive, medical, industrial, and household appliances. Their excellent performance makes them an important component of modern heating technology. However, in practical applications, the heated equipment often overheats, which can damage the equipment and pose a safety risk. Utility Model Content

[0003] The present invention aims to solve the problem that the heated equipment often overheats when the heating film is used in specific applications.

[0004] To solve the above problems, this utility model provides a heating film, including an insulating film substrate, a resistance wire, a temperature control switch, and lead wires. The resistance wire and the temperature control switch are respectively disposed on the insulating film substrate, and the lead wires, the resistance wire, and the temperature control switch are connected in series. At least a portion of the lead wires is located outside the edge of the insulating film substrate.

[0005] This invention provides a heating film in which the insulating film substrate serves as the mounting carrier for the resistance wire, ensuring that the resistance wire will not short-circuit. This guarantees that the current, once energized, can flow along the extension direction of the resistance wire, allowing it to heat up normally. Unlike existing technologies, this heating film also integrates a temperature control switch. A lead wire, the resistance wire, and the temperature control switch are connected in series. When the portion of the lead wire outside the insulating film substrate is connected to a power source, the external power supply, the resistance wire, and the temperature control switch form a closed series circuit. As the resistance wire heats the equipment, the temperature control switch can monitor the temperature of the heated equipment in real time. If the temperature exceeds a set value, the temperature control switch automatically disconnects, preventing further current from flowing through the resistance wire and ensuring that the temperature of the heated equipment remains within a reasonable range, thus ensuring high safety. Furthermore, the manufacturer integrates the temperature control switch from the initial production stage, integrating both the temperature control switch and the resistance wire onto the insulating film substrate. This results in multifunctionality, high integration, and a small footprint when applied to the heated equipment, making it easy to install.

[0006] Furthermore, the insulating film substrate includes a first region and a second region, the resistance wire is disposed in the first region, and the temperature control switch is disposed in the second region.

[0007] Furthermore, the lead wires are provided in two places, the resistance wires are provided in two places, the two lead wires are respectively the first wire and the second wire, the two resistance wires are respectively the first resistance wire and the second resistance wire, and the temperature control switch includes two pins, which are respectively the first pin and the second pin.

[0008] One end of the first wire is connected to one end of the first resistance wire, the other end of the first resistance wire is connected to the first pin, the second pin is connected to one end of the second resistance wire, and the other end of the second resistance wire is connected to one end of the second wire.

[0009] Furthermore, the first resistance wire extends in a straight line shape, while the second resistance wire extends in a maze shape.

[0010] Furthermore, the second resistance wire includes a plurality of straight segment portions, the insulating film substrate forms a first interval between any adjacent and parallel straight segment portions, a second interval is formed between the straight segments corresponding to the first resistance wire and the second resistance wire, and the width of the resistance wire is greater than the width of the first interval and the width of the second interval.

[0011] Furthermore, the first wire and the first resistance wire, as well as the second wire and the second resistance wire, are soldered together via a shared first pad; the first pin and the first resistance wire, as well as the second pin and the second resistance wire, are soldered together via a shared second pad.

[0012] Furthermore, the insulating film substrate is a polyimide film, and the resistance wire is made of constantan alloy or nickel-chromium alloy.

[0013] Furthermore, the temperature control switch is located at the edge of the insulating film substrate.

[0014] Furthermore, the insulating film substrate is provided with two layers, namely a first insulating film substrate and a second insulating film substrate, the resistance wire is located between the first insulating film substrate and the second insulating film substrate, the temperature control switch is disposed on the first insulating film substrate, and the second insulating film substrate is provided with a clearance opening for exposing the temperature control switch.

[0015] This utility model also provides a device with a heating function, including the heating film as described above.

[0016] Since the technological improvements and effects of the heating device are the same as those of the heating film, the heating device will not be described in detail here. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the heating film in an embodiment of the present invention when it has an insulating film substrate;

[0018] Figure 2 This is a schematic diagram of the structure of the heating film in an embodiment of the present invention when it has two layers of insulating film substrate.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Insulating film substrate; 11. First insulating film substrate; 12. Second insulating film substrate; 121. Clearance opening; 2. Resistance wire; 21. First resistance wire; 22. Second resistance wire; 3. Temperature control switch; 31. First pin; 32. Second pin; 4. Lead wire; 41. First lead wire; 42. Second lead wire; 51. First gap; 52. Second gap; 61. First pad; 62. Second pad. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0022] In the attached diagram, the Z-axis represents the vertical direction, i.e., the up-down position, with the positive direction of the Z-axis representing up and the negative direction representing down. The Y-axis represents the left-right position, with the positive direction of the Y-axis representing the left and the negative direction representing the right. It should be noted that the aforementioned representations of the Z-axis and Y-axis are merely for ease of description and simplification of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0023] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0024] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". The term "connection" used in this utility model, unless specifically stated otherwise, can refer to a direct connection, an indirect connection via one or more intermediate components, a detachable connection, welding, or an integral connection.

[0025] See Figure 1 A heating film according to an embodiment of the present invention includes an insulating film substrate 1, a resistance wire 2, a temperature control switch 3, and a lead wire 4. The resistance wire 2 and the temperature control switch 3 are respectively disposed on the insulating film substrate 1. The lead wire 4, the resistance wire 2, and the temperature control switch 3 are connected in series. At least a portion of the lead wire 4 is located outside the edge of the insulating film substrate 1.

[0026] In this embodiment, a heating film is provided. The insulating film substrate 1 serves as the mounting carrier for the resistance wire 2, ensuring that the resistance wire 2 will not short-circuit. This ensures that the current after being energized can flow along the extension direction of the resistance wire 2, allowing the resistance wire 2 to heat up normally. Unlike existing technologies, this heating film also integrates a temperature control switch 3. The resistance wire 2 and the temperature control switch 3 are connected in series via lead wire 4. Thus, when the part of the lead wire 4 located outside the insulating film substrate 1 is connected to a power source, the external power source, the resistance wire 2, and the temperature control switch 3 can form a closed series circuit. When the resistance wire 2 heats up and heats the device being heated, the temperature control switch 3 can detect the temperature of the device being heated in real time. If the temperature of the device being heated exceeds the set value, the temperature control switch 3 can automatically disconnect, and no more current will flow through the resistance wire 2, ensuring that the temperature of the device being heated is always within a reasonable range, thus ensuring high safety.

[0027] In addition, the manufacturer of the heating film integrated the temperature control switch 3 at the beginning of production. That is, the temperature control switch 3 and the resistance wire 2 are both integrated on the insulating film substrate 1. It has multiple functions, a high degree of integration, and occupies little space when applied to the heated equipment, making it easy to arrange.

[0028] Optionally, the insulating film substrate 1 is a polyimide film, and the resistance wire 2 is made of constantan alloy or nickel-chromium alloy.

[0029] In this embodiment, the heating film can be a polyimide heating film, that is, the insulating film substrate 1 is a polyimide film. Polyimide is a high-performance synthetic polymer with excellent high-temperature resistance, chemical resistance, and electrical insulation. It can maintain good mechanical properties and stability even in high-temperature environments. It can be applied to electronic components, aerospace equipment, electronic devices (for heating mobile phones, tablets, and other electronic devices to prevent low-temperature or high-temperature failures), automobiles (for seat heating, rearview mirror heating, car window heating, etc.), medical devices (for heating pads, temperature control equipment, etc.), or other applications in high-temperature environments.

[0030] When applied to equipment or electronic components, this heating film solves the problem of potential safety accidents caused by improper temperature control during the heating process. It monitors the equipment temperature in real time via a temperature control switch 3 and automatically cuts off power in case of abnormal temperatures, ensuring the safety of operators and equipment. For example, this device can be installed on automotive glass, window glass, and outdoor equipment to provide de-icing and defogging functions, reducing the impact of low temperatures and fog in winter on daily life and production, ensuring normal operation. The heating film can monitor and control the equipment temperature in real time, ensuring temperature stability during the heating process, thereby improving production efficiency. By controlling the temperature, it can prevent changes in product quality caused by temperature fluctuations, improving product consistency and stability.

[0031] In this embodiment, especially when applied to the surface of a metal or plastic part, the heating film generates heat through the flow of electric current when heated, and this heat can enable the film material to form a good adhesion between itself and the external metal or plastic part.

[0032] In this embodiment, the resistance wire 2 can be constantan alloy, which is an alloy with copper as the main component, usually with the addition of beryllium, nickel or other metals to improve its strength and corrosion resistance. Constantan alloy has excellent electrical conductivity and can effectively conduct current; although copper has a low melting point, constantan alloy can still maintain good mechanical properties at high temperatures; and constantan alloy is easy to process and shape, making it suitable for manufacturing resistance wires 2 with complex shapes.

[0033] In this embodiment, the resistance wire 2 can also be a nickel-chromium alloy, which is an alloy with nickel and chromium as the main components and is widely used in the manufacture of resistance heating elements. Nickel-chromium alloys have excellent high-temperature resistance and can work for a long time in high-temperature environments without failure; the alloy has high resistivity and can effectively convert electrical energy into heat energy; and nickel-chromium alloys have good oxidation resistance at high temperatures and can remain stable in oxidizing environments.

[0034] Alternatively, the heating film can be firmly attached to the surface of an external device by bonding, hot pressing or other methods. This attachment enables the heating film to effectively transfer heat to the substrate, thereby achieving a heating effect.

[0035] Optionally, the insulating film substrate 1 includes a first region and a second region, the resistance wire 2 is disposed in the first region, and the temperature control switch 3 is disposed in the second region.

[0036] In this embodiment, the insulating film substrate 1 is mainly divided into two regions, namely, a first region and a second region. The first region is used to arrange the resistance wire 2, while the second region is used to arrange the temperature control switch 3. The resistance wire 2 located in the first region will not directly affect the temperature of the temperature control switch 3 after it heats up. The temperature control switch 3 directly detects the temperature of the heated equipment, ensuring the accuracy of the temperature switch when it is turned on and off.

[0037] The insulating film may consist of only one insulating film substrate 1. The side of the resistance wire 2 facing away from the insulating film substrate 1 can directly contact the device being heated. This design allows the resistance wire 2 to directly contact the external device, effectively transferring the generated heat to the device with high heat transfer efficiency, facilitating rapid heating of the external device. Furthermore, the heating film consisting of only a single insulating film substrate 1 is easy to install and use. Additionally, the temperature control switch 3 can also directly contact the external device to directly detect its temperature.

[0038] See Figure 1 Optionally, the lead wire 4 is provided with two wires, the resistance wire 2 is provided with two wires, the two lead wires 4 are respectively the first wire 41 and the second wire 42, the two resistance wires 2 are respectively the first resistance wire 21 and the second resistance wire 22, and the temperature control switch 3 includes two pins, the two pins are respectively the first pin 31 and the second pin 32.

[0039] One end of the first wire 41 is connected to one end of the first resistance wire 21, the other end of the first resistance wire 21 is connected to the first pin 31, the second pin 32 is connected to one end of the second resistance wire 22, and the other end of the second resistance wire 22 is connected to one end of the second wire 42.

[0040] In this embodiment, the two lead wires 4 are used to connect to the positive and negative terminals of the external power supply, respectively. For example, the first lead wire 41 is connected to the positive terminal of the external power supply, and the second lead wire 42 is connected to the negative terminal. Thus, with one end of the first lead wire 41 connected to one end of the first resistance wire 21, the other end of the first resistance wire 21 connected to the first pin 31, the second pin 32 connected to one end of the second resistance wire 22, and the other end of the second resistance wire 22 connected to one end of the second lead wire 42, when the temperature of the external heated device exceeds a reasonable range, the temperature control switch 3 is normally closed. At this time, the current from the external power supply flows sequentially from its positive terminal, through the first lead wire 41, the first resistance wire 21, the temperature control switch 3, the second resistance wire 22, and the second lead wire 42 back to the negative terminal of the external power supply, forming a closed loop to keep the heating film in working condition. When the temperature of the external heated device is too high, for example, exceeding the set value, the temperature control switch 3 will automatically open, breaking the closed loop and preventing current circulation.

[0041] Optionally, see Figure 1 The first resistance wire 21 extends in a straight line shape, while the second resistance wire 22 extends in a maze shape.

[0042] In this embodiment, the first resistance wire 21 is mainly used to support the first pin 31 and the first wire 41 of the temperature control switch 3. It can be designed to be relatively short and straight to reduce manufacturing difficulty. With the first resistance wire 21 relatively short, the second resistance wire 22 is made as long as possible to increase its arrangement area on the insulating film substrate 1. Therefore, the extension direction of the second resistance wire 22 can be designed in a maze shape. The resistance wire 2 can be sprayed or bonded to the insulating film substrate 1, while the temperature control switch 3 can be bonded to the insulating film substrate 1.

[0043] Optionally, see Figure 1 The second resistance wire 22 includes multiple straight segment portions. The insulating film substrate 1 forms a first interval 51 between any adjacent and parallel straight segment portions. A second interval 52 is formed between the straight segments corresponding to the first resistance wire 21 and the second resistance wire 22. The width of the resistance wire 2 is greater than the width of the first interval 51 and the second interval 52.

[0044] In this embodiment, as Figure 1As shown, the second resistance wire 22 is labyrinthine in shape, formed by connecting many straight segments end to end. A first gap 51 is formed between any adjacent and parallel straight segments on the insulating film substrate 1, and a second gap 52 is formed between the corresponding straight segments of the first resistance wire 21 and the second resistance wire 22. Thus, the first gap 51 ensures that the second resistance wire 22 will not short-circuit along its extension path, while the second gap 52 ensures that there will be no short circuit between the first resistance wire 21 and the second resistance wire 22. The width of the resistance wire 2 is greater than that of the first gap 51 and the second gap 52. Increasing the width of the resistance wire 2 can generally reduce the resistance, thereby increasing the current and thus increasing the heat generation.

[0045] Optionally, see Figure 1 The first wire 41 and the first resistance wire 21, as well as the second wire 42 and the second resistance wire 22, are respectively soldered through a shared first pad 61; the first pin 31 and the first resistance wire 21, as well as the second pin 32 and the second resistance wire 22, are respectively soldered through a shared second pad 62.

[0046] In this embodiment, the first wire 41 and the second wire 42 are soldered to the first resistance wire 21 and the second resistance wire 22 respectively through a common first solder pad 61. This reduces the soldering difficulty while providing a stable connection point, ensuring that the current can effectively pass through the connected components during the soldering process. Similarly, the second solder pad 62 is soldered in the same way. The space between the first solder pad 61 and the second solder pad 62 includes not only the first resistance wire 21 but also a portion of the second resistance wire 22, in order to maximize the area of ​​the resistance wire 2 on the insulating film substrate 1 and increase heat generation.

[0047] Optionally, see Figure 1 The temperature control switch 3 is located at the edge of the insulating film substrate 1.

[0048] In this embodiment, by placing the temperature control switch 3 at the edge of the insulating film substrate 1, the risk of it being directly exposed to the heating zone can be reduced, thereby avoiding failure or malfunction of the temperature control element due to local overheating. The edge position is usually far away from the direct heat source of the resistance heating material, which can improve the reliability and service life of the temperature control element and reduce damage caused by high temperature environment. The edge position is usually easier to access and install, which facilitates later maintenance and replacement, especially in applications that require regular inspection or replacement of temperature control elements. Placing the temperature control switch 3 at the edge can reduce the risk of electric shock or burns, especially in the application environment of heating film, to ensure user safety.

[0049] See Figure 2Optionally, the insulating film substrate 1 is provided with two layers, namely a first insulating film substrate 11 and a second insulating film substrate 12, the resistance wire 2 is located between the first insulating film substrate 11 and the second insulating film substrate 12, the temperature control switch 3 is disposed on the first insulating film substrate 11, and the second insulating film substrate 12 is provided with a clearance opening 121 for exposing the temperature control switch 3.

[0050] In this embodiment, the insulating film substrate 1 has two layers, and the resistance wire 2 is located between the first insulating film substrate 11 and the second insulating film substrate 12. This design not only protects the resistance heating material (resistance wire 2), improving safety and insulation performance, but also achieves more uniform heat distribution and enhanced mechanical strength, making it suitable for a wider range of applications. The temperature control switch 3 is disposed on the first insulating film substrate 11, and the second insulating substrate is correspondingly provided with a clearance opening 121 (located in...). Figure 2 (as shown in the lower left corner) to expose the temperature control switch 3, so that the temperature control switch 3 can directly contact the heated equipment.

[0051] Alternatively, the temperature control switch can be a thin or miniature temperature control switch, which is designed to provide temperature control in space-constrained applications.

[0052] Another embodiment of the present invention provides a device with a heating function, including the heating film as described above.

[0053] Since the technological improvements and effects of the heating device are the same as those of the heating film, the heating device will not be described in detail here.

[0054] Optionally, devices with heating functions can be automotive glass, window glass, electronic components, aerospace parts, etc. In addition to self-heating, these devices can also monitor their own temperature to improve safety.

[0055] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include at least one of those features.

[0056] Although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A heating film, characterized in that, The device includes an insulating film substrate (1), a resistance wire (2), a temperature control switch (3), and a lead wire (4). The resistance wire (2) and the temperature control switch (3) are respectively disposed on the insulating film substrate (1). The lead wire (4), the resistance wire (2), and the temperature control switch (3) are connected in series. At least a portion of the lead wire (4) is located outside the edge of the insulating film substrate (1).

2. The heating film according to claim 1, characterized in that, The insulating film substrate (1) includes a first region and a second region, the resistance wire (2) is disposed in the first region, and the temperature control switch (3) is disposed in the second region.

3. The heating film according to claim 1, characterized in that, Two lead wires (4) are provided, two resistance wires (2) are provided, the two lead wires (4) are respectively the first wire (41) and the second wire (42), the two resistance wires (2) are respectively the first resistance wire (21) and the second resistance wire (22), and the temperature control switch (3) includes two pins, the two pins are respectively the first pin (31) and the second pin (32). One end of the first wire (41) is connected to one end of the first resistance wire (21), the other end of the first resistance wire (21) is connected to the first pin (31), the second pin (32) is connected to one end of the second resistance wire (22), and the other end of the second resistance wire (22) is connected to one end of the second wire (42).

4. The heating film according to claim 3, characterized in that, The first resistance wire (21) extends in a straight line shape, while the second resistance wire (22) extends in a maze shape.

5. The heating film according to claim 4, characterized in that, The second resistance wire (22) includes a plurality of straight segment portions. The insulating film substrate (1) forms a first interval (51) between any adjacent and parallel straight segment portions. A second interval (52) is formed between the straight segments corresponding to the first resistance wire (21) and the second resistance wire (22). The width of the resistance wire (2) is greater than the width of the first interval (51) and the second interval (52).

6. The heating film according to claim 3, characterized in that, The first wire (41) is soldered to the first resistance wire (21) and the second wire (42) is soldered to the second resistance wire (22) through a common first pad (61); the first pin (31) is soldered to the first resistance wire (21) and the second pin (32) is soldered to the second resistance wire (22) through a common second pad (62).

7. The heating film according to claim 1, characterized in that, The insulating film substrate (1) is a polyimide film, and the resistance wire (2) is made of constantan alloy or nickel-chromium alloy.

8. The heating film according to claim 1, characterized in that, The temperature control switch (3) is located at the edge of the insulating film substrate (1).

9. The heating film according to any one of claims 1-8, characterized in that, The insulating film substrate (1) is provided with two layers, namely a first insulating film substrate (11) and a second insulating film substrate (12). The resistance wire (2) is located between the first insulating film substrate (11) and the second insulating film substrate (12). The temperature control switch (3) is disposed on the first insulating film substrate (11), and the second insulating film substrate (12) is provided with a clearance opening (121) for exposing the temperature control switch (3).

10. A device with a heating function, characterized in that, Including the heating film as described in any one of claims 1-9.

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