Variable heating device

Abstract

The present invention can provide a variable heating device that has a transparent heating area so that the process of cooking food can be easily observed, is transformable, and can perform multiple functions.

Description

[Technical Field]

[0001] This specification asserts the rights as of the filing date of Korean Patent Application No. 10-2021-0019317, filed with the Korean Intellectual Property Office on February 10, 2021, and all of its contents are incorporated into this invention.

[0002] The present invention relates to a variable heating device, and more specifically, to a heating device in which the heating portion is formed transparently and is deformable. [Background technology]

[0003] Recently, with the increase in single-person households, there has been a growing demand for kitchen appliances that offer multiple functions and are compact in size. In particular, regarding cooking appliances, there is growing interest in cooking appliances that can cook food using electricity, due to problems such as the harmful gases released when gas ranges ignite and gas leaks.

[0004] Generally, cooking appliances that use electricity to heat food are opaque, making it difficult to monitor the cooking process and thus hindering hygienic management.

[0005] Therefore, there is a need to develop a cooking appliance that allows for easy monitoring of the food preparation process, enables hygienic management, and possesses multiple functions. [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The problem that this invention aims to solve is to provide a variable heating device in which the heating area is transparent, the heating process of the target object can be easily observed, it is deformable, and it can perform multiple functions.

[0007] However, the problems that this invention aims to solve are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0008] One embodiment of the present invention provides a variable heating device comprising a first transparent heating section including a first transparent heating element, a second transparent heating section including a second transparent heating element, and a folding section provided between the first transparent heating section and the second transparent heating section. [Effects of the Invention]

[0009] In one embodiment of the present invention, the variable heating device has a transparent heating element, allowing for easy observation of the heating process.

[0010] In one embodiment of the present invention, the variable heating device has a transparent heating element, making hygienic management easier.

[0011] A variable heating device according to one embodiment of the present invention has the advantage of being deformable via a folding section, allowing for easy heating of a variety of objects.

[0012] The effects of the present invention are not limited to those described above, and any effects not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings. [Brief explanation of the drawing]

[0013] [Figure 1A] This figure schematically shows a variable heating device according to one embodiment of the present invention in a folded state. [Figure 1B] This diagram schematically shows the variable heating device in its deployed state. [Figure 2A] This figure schematically shows a plan view of a variable heating device according to one embodiment of the present invention. [Figure 2B] This figure schematically shows a cross-sectional view of the variable heating device along line AB in Figure 2A. [Figure 2C] This figure schematically shows a cross-sectional view of the variable heating device along the CD line in Figure 2A. [Figure 3A] This figure schematically shows a plan view of a variable heating device according to one embodiment of the present invention. [Figure 3B] This figure schematically shows a cross-sectional view of the variable heating device along line AB in Figure 3A. [Figure 4A] This figure schematically shows a state in which the folding part of a variable heating device according to one embodiment of the present invention has been detached. [Figure 4B] This figure shows how the folding portion of a variable heating device according to one embodiment of the present invention deforms to adjust the distance between the first transparent heating portion and the second transparent heating portion. [Figure 5A] This figure schematically shows a plan view of a variable heating device according to one embodiment of the present invention. [Figure 5B] This figure schematically shows a cross-sectional view of the variable heating device along line AB in Figure 5A. [Figure 6A] This figure schematically shows a plan view of a variable heating device equipped with a control unit, a temperature display unit, a drive time control unit, and a light-emitting element according to one embodiment of the present invention. [Figure 6B] This figure schematically shows a plan view of a variable heating device equipped with a control unit, a temperature display unit, a drive time control unit, and a video display unit according to one embodiment of the present invention. [Figure 7A] This figure shows an electrode included in a variable heating device according to one embodiment of the present invention. [Figure 7B] This figure shows an electrode included in a variable heating device according to one embodiment of the present invention. [Figure 7C] This figure shows an electrode included in a variable heating device according to one embodiment of the present invention. [Figure 7D] This figure shows an electrode included in a variable heating device according to one embodiment of the present invention. [Figure 8A] This figure schematically shows a variable heating device according to one embodiment of the present invention in a folded state. [Figure 8B] This diagram schematically shows the variable heating device in its deployed state. [Figure 9A]This figure schematically shows a plan view of a variable heating device according to one embodiment of the present invention. [Figure 9B] This figure schematically shows a cross-sectional view of the variable heating device along line AB in Figure 9A. [Figure 10A] This figure schematically shows a plan view of a variable heating device according to one embodiment of the present invention. [Figure 10B] This figure schematically shows a cross-sectional view of the variable heating device along line AB in Figure 10A. [Figure 10C] This figure schematically shows a cross-sectional view of the variable heating device along the CD line in Figure 10A. [Figure 11] This figure schematically shows a cross-sectional view of a variable heating device equipped with a transparent auxiliary layer according to one embodiment of the present invention. [Figure 12A] This figure schematically shows the state in which the folding part of a variable heating device according to one embodiment of the present invention is attached. [Figure 12B] This figure schematically shows a state in which the folding part of a variable heating device according to one embodiment of the present invention has been detached. [Figure 13A] This figure shows how the folding portion of a variable heating device according to one embodiment of the present invention deforms to adjust the distance between the first transparent heating portion and the second transparent heating portion. [Figure 13B] This figure shows how the folding portion of a variable heating device according to one embodiment of the present invention deforms to adjust the distance between the first transparent heating portion and the second transparent heating portion. [Figure 14A] This figure schematically shows a plan view of a variable heating device according to one embodiment of the present invention. [Figure 14B] This figure schematically shows a cross-sectional view of the variable heating device along line AB in Figure 14A. [Figure 15A] This figure schematically shows a cross-sectional view of a variable heating device equipped with a transparent protective layer according to one embodiment of the present invention. [Figure 15B] This figure schematically shows a cross-sectional view of a variable heating device equipped with a transparent protective layer according to one embodiment of the present invention. [Figure 16]This figure shows a cross-sectional view of a variable heating device according to one embodiment of the present invention. [Figure 17] This is an image showing a grid-like pattern of silver (Ag) electrodes formed as auxiliary electrodes on a transparent glass substrate according to one embodiment of the present invention. [Modes for carrying out the invention]

[0014] One embodiment of the present invention provides a variable heating device comprising a first transparent heating section including a first transparent heating element, a second transparent heating section including a second transparent heating element, and a folding section provided between the first transparent heating section and the second transparent heating section.

[0015] According to one embodiment of the present invention, the first transparent heating element and the second transparent heating element may be a graphene thin film.

[0016] According to one embodiment of the present invention, the graphene thin film may include one or more graphene layers.

[0017] According to one embodiment of the present invention, the graphene thin film may be doped with a dopant.

[0018] According to one embodiment of the present invention, the first transparent heating section includes a first transparent substrate on which the first transparent heating element is provided, and a second transparent substrate facing the first transparent substrate with the first transparent heating element in between; the second transparent heating section includes a third transparent substrate on which the second transparent heating element is provided, and a fourth transparent substrate facing the third transparent substrate with the second transparent heating element in between; the first transparent substrate and the second transparent substrate are sealed to form an air gap between the first transparent substrate and the second transparent substrate; and the third transparent substrate and the fourth transparent substrate are sealed to form an air gap between the third transparent substrate and the fourth transparent substrate.

[0019] According to one embodiment of the present invention, the first transparent heating section includes a first spacer provided between the first transparent substrate and the second transparent substrate to seal the first transparent substrate and the second transparent substrate, and the second transparent heating section may include a second spacer provided between the third transparent substrate and the fourth transparent substrate to seal the third transparent substrate and the fourth transparent substrate.

[0020] According to one embodiment of the present invention, the air gap may contain an inert gas.

[0021] According to one embodiment of the present invention, the first transparent heating section further includes an electrode connected to the first transparent heating element, and the second transparent heating section may further include an electrode connected to the second transparent heating element.

[0022] According to one embodiment of the present invention, the folding portion is detachable from the first transparent heating portion and the second transparent heating portion.

[0023] According to one embodiment of the present invention, the variable heating device further includes a transparent flexible substrate, the transparent flexible substrate including a first transparent heating region provided with the first transparent heating section, a second transparent heating region provided with the second transparent heating section, and a folding region located between the first transparent heating section and the second transparent heating section, wherein the folding section may be a portion of the transparent flexible substrate corresponding to the folding region.

[0024] According to one embodiment of the present invention, the variable heating device may further include a first temperature control unit connected to the first transparent heating element for controlling the degree of heating of the first transparent heating element, and a second temperature control unit connected to the second transparent heating element for controlling the degree of heating of the second transparent heating element.

[0025] According to one embodiment of the present invention, the variable heating device may further include a first drive time control unit connected to the first transparent heating element and controlling the drive time of the first transparent heating element, and a second drive time control unit connected to the second transparent heating element and controlling the drive time of the second transparent heating element.

[0026] According to one embodiment of the present invention, the variable heating device may further include a first display unit connected to the first transparent heating element and displaying drive information including the temperature and operating time of the first transparent heating element, and a second display unit connected to the second transparent heating element and displaying drive information including the temperature and operating time of the second transparent heating element.

[0027] According to one embodiment of the present invention, each of the first display unit and the second display unit may include a light-emitting element that changes color according to the temperature of a transparent heating element.

[0028] According to one embodiment of the present invention, at least one of the first transparent heating unit and the second transparent heating unit may further include a video display unit that outputs an image.

[0029] According to one embodiment of the present invention, the first transparent heating section further includes a first transparent substrate on which the first transparent heating element is provided, and an electrode connected to the first transparent heating element, and the second transparent heating section may further include a second transparent substrate on which the second transparent heating element is provided, and an electrode connected to the second transparent heating element.

[0030] According to one embodiment of the present invention, the first transparent heating section further includes a first transparent auxiliary layer provided between the first transparent heating element and the first transparent substrate, and the second transparent heating section may further include a second transparent auxiliary layer provided between the second transparent heating element and the second transparent substrate.

[0031] According to one embodiment of the present invention, the first transparent heating section further includes a first transparent protective layer provided on the first transparent heating element, and the second transparent heating section may further include a second transparent protective layer provided on the second transparent heating element.

[0032] [Examples] In this specification, when a part is said to "include" a component, this means, unless otherwise stated, that it may further include other components rather than excluding them.

[0033] In this specification, when one member is said to be located "on" another member, this includes not only cases where one member is in contact with another member, but also cases where there is yet another member between the two members.

[0034] In this specification, the terms "step to do" and "step of" do not mean "step for".

[0035] In this specification, the term "graphene layer" refers to a film or sheet of graphene in which multiple carbon atoms are covalently linked to each other to form polycyclic aromatic molecules, wherein the covalently linked carbon atoms form a 6-membered ring as a basic repeating unit, but may further include 5-membered rings and / or 7-membered rings. Therefore, the "graphene layer" is composed of carbon atoms covalently linked to each other (usually sp 2 It is shown as a single layer of (bonded) graphene. The "graphene layer" can have a variety of structures, and such structures vary depending on the content of 5-membered rings and / or 7-membered rings contained in the graphene. The "graphene layer" consists of a single layer of graphene as described above, but it is also possible to stack several of these to form multiple layers, and a thickness of up to 100 nm can be formed.

[0036] In this specification, "transparent heating section" refers collectively to the first transparent heating section and the second transparent heating section; "transparent heating element" refers collectively to the first transparent heating element and the second transparent heating element; "transparent substrate" refers collectively to the first transparent substrate and the second transparent substrate; "transparent auxiliary layer" refers collectively to the first transparent auxiliary layer and the second transparent auxiliary layer; and "transparent protective layer" refers collectively to the first transparent protective layer and the second transparent protective layer.

[0037] The specific details for carrying out the present invention will be described in detail below with reference to the attached drawings.

[0038] Figure 1A is a schematic diagram showing a variable heating device according to one embodiment of the present invention in a folded state, and Figure 1B is a schematic diagram showing the variable heating device in an unfolded state. Figures 1A and 1B are schematic diagrams showing the configuration of the variable heating device, and for the sake of convenience of explanation, the configuration of spacers, electrodes, etc., which will be described later, is omitted.

[0039] One embodiment of the present invention provides a variable heating device comprising a first transparent heating section including a first transparent heating element, a second transparent heating section including a second transparent heating element, and a folding section provided between the first transparent heating section and the second transparent heating section.

[0040] A variable heating device according to one embodiment of the present invention has a transparent heating element, allowing for easy observation of the heating process and facilitating hygienic management. Furthermore, the variable heating device can be deformed via a folding section, offering the advantage of easily heating a variety of objects.

[0041] Referring to Figures 1A and 1B, the variable heating device 100 includes a first transparent heating section 110, a second transparent heating section 120, and a folding section 130. In this case, the folding section 130 is provided between the first transparent heating section 110 and the second transparent heating section 120. As shown in Figure 1A, the variable heating device 100 is folded via the folding section 130 so that the first transparent heating section 110 and the second transparent heating section 120 face each other. As shown in Figure 1B, the variable heating device 100 is unfolded via the folding section 130 so that the first transparent heating section 110 and the second transparent heating section 120 are horizontal to the location where the variable heating device 100 is provided (for example, the ground). In other words, the variable heating device 100 may be a folding type heating device.

[0042] Referring to Figures 1A and 1B, the first transparent heating element 111 of the first transparent heating section 110 and the second transparent heating element 121 of the second transparent heating section 120 can be positioned at an angle of 0° to 180° relative to each other via the folding section 130.

[0043] According to one embodiment of the present invention, the variable heating device is deformable via a folding section and can heat a variety of objects. For example, the variable heating device may be a heating device for cooking food. Specifically, when the variable heating device is folded, it can function like a toaster to bake bread, and can also cook meat, etc. That is, the variable heating device may be a variable transparent toaster. Furthermore, the variable heating device can cook meats such as pork and beef, fish such as mackerel and Spanish mackerel, vegetables such as spinach, Chinese cabbage and bok choy, processed foods such as pizza and dumplings, etc., in a folded or unfolded state. However, the types of objects that can be cooked using the variable heating device are not limited to those described above.

[0044] Furthermore, when the variable heating device is unfolded, it can function like a hot tray to cook food or keep cooked food warm. Therefore, the variable heating device can achieve multiple functions through folding. In addition, the variable heating device can be stored or kept in a folded state, making it easy to store and transport.

[0045] According to one embodiment of the present invention, the variable heating device can heat the target object to a temperature of 800°C or lower. Specifically, the temperature at which the variable heating device heats the target object may be 700°C or lower, 600°C or lower, 500°C or lower, 400°C or lower, 300°C or lower, 200°C or lower, 100°C or lower, or 50°C or lower. Alternatively, the temperature at which the variable heating device heats the target object may be 35°C or higher, 50°C or higher, 75°C or higher, 100°C or higher, 200°C or higher, 300°C or higher, 400°C or higher, 500°C or higher, 600°C or higher, or 700°C or higher. The temperatures at which the target object is heated as described above may also be the temperatures at which the first and second transparent heating sections are heated. As described later, the temperature at which the first transparent heating section (first transparent heating element) is heated can be controlled by the first temperature control unit, and the temperature at which the second transparent heating section (second transparent heating element) is heated can be controlled by the second temperature control unit.

[0046] According to one embodiment of the present invention, the first transparent heating section and the second transparent heating section are transparent. That is, there is an advantage in that the degree of heating and the state of the object being heated in contact with the first and second transparent heating sections can be checked in real time. Furthermore, because the first and second transparent heating sections are transparent, there is an advantage in that the presence of foreign matter attached to the first and second transparent heating sections can be easily checked, enabling hygienic management.

[0047] According to one embodiment of the present invention, the first transparent heating element and the second transparent heating element may be a graphene thin film. Other materials may be used as the first and second transparent heating elements, but considering the excellent transparency and heating properties of graphene, the following description will focus on embodiments in which graphene is used as the first and second transparent heating elements.

[0048] According to one embodiment of the present invention, graphene can be synthesized using chemical vapor deposition to produce a first transparent heating element and a second transparent heating element. The method for forming the graphene can be any method for synthesizing graphene in the industry without limitation. For example, graphene can be synthesized on the first transparent substrate and the third transparent substrate, as described later, by heating them and supplying hydrogen gas and a carbonization source. The carbonization source may include, but is not limited to, at least one of carbon monoxide, carbon dioxide, methane, ethane, ethylene, ethanol, acetylene, propane, butane, butadiene, pentane, pentene, cyclopentadiene, hexane, cyclohexane, benzene, and toluene.

[0049] According to one embodiment of the present invention, the chemical vapor deposition method is carried out at a temperature of 700°C or higher. Specifically, the chemical vapor deposition method is carried out at a temperature of 750°C or higher, 800°C or higher, 850°C or higher, 900°C or higher, or 1,000°C or higher. Alternatively, the chemical vapor deposition method can be carried out at a temperature of 2,000°C or lower, 1,900°C or lower, 1,800°C or lower, 1,700°C or lower, 1,600°C or lower, or 1,500°C or lower. When the temperature at which the chemical vapor deposition method is carried out is within the above-mentioned range, the graphene can be formed stably, and the synthesized graphene can have excellent crystallinity.

[0050] According to one embodiment of the present invention, the graphene thin film may include one or more graphene layers. Specifically, the graphene thin film may include one to five layers, two to five layers, three to five layers, one to three layers, or two to three layers of graphene layers. When the number of graphene layers included in the graphene thin film is within the aforementioned range, the surface resistance of the graphene thin film can be reduced, thereby improving the maximum temperature, heating efficiency, and heat dissipation characteristics of the graphene thin film. That is, the first and second transparent heating elements can effectively heat the target while simultaneously effectively reducing the thickness of the first and second transparent heating elements. This has the advantage of reducing the thickness and weight of the variable heating device and improving heating efficiency. On the other hand, depending on the application in which the variable heating device is used, the number of graphene layers included in the graphene thin film may be adjusted to five or more layers.

[0051] According to one embodiment of the present invention, the graphene thin film may be doped with a dopant. By using doped graphene, the heat generation efficiency of the first and second transparent heat-generating elements can be increased. Specifically, the dopant may include an organic dopant or an inorganic dopant. The dopant may include, but is not limited to, those selected from the group consisting of ionic liquids, ionic gases, acid compounds, organic molecular compounds, and combinations thereof. For example, the dopant may include, but is not limited to, those selected from the group consisting of NO2BF4, NOBF4, NO2SbF6, HCl, H2PO4, H3CCOOH, H2SO4, HNO3, PVDF, Nafion, AuCl3, SOCl2, Br2, CH3NO2, dichlorodicyanoquinone, oxone, dimyristoylphosphatidylinositol, trifluoromethanesulfonimide, and combinations thereof.

[0052] According to one embodiment of the present invention, the resistance value per unit area of ​​the graphene thin film is 0.01 Ω / cm². 2 More than 5Ω / cm2 Hereinafter, 0.02 Ω / cm 2 or more than 5 Ω / cm 2 Hereinafter, 0.05 Ω / cm 2 or more than 5 Ω / cm 2 Hereinafter, 0.1 Ω / cm 2 or more than 5 Ω / cm 2 Hereinafter, 0.5 Ω / cm 2 or more than 5 Ω / cm 2 Hereinafter, 1 Ω / cm 2 or more than 5 Ω / cm 2 Hereinafter, 2 Ω / cm 2 or more than 5 Ω / cm 2 Hereinafter, 3 Ω / cm 2 or more than 5 Ω / cm 2 Hereinafter, 4 Ω / cm 2 or more than 5 Ω / cm 2 Hereinafter, 0.01 Ω / cm 2 or more than 1 Ω / cm 2 Hereinafter, 0.0 2 Ω / cm 2 or more than 1 Ω / cm 2 Hereinafter, 0.05 Ω / cm 2 or more than 1 Ω / cm 2 Hereinafter, 0.1 Ω / cm 2 or more than 1 Ω / cm 2 Hereinafter, or​​​​​​​​​​​​​​​The following are also possible. Specifically, the size of the graphene thin film may be 10 cm × 10 cm or more and 40 cm × 60 cm. Also, if the graphene thin film contains one graphene layer, the area of ​​the graphene thin film at the aforementioned size may be 200 Ω or more and 400 Ω or less. If the graphene thin film contains two graphene layers, the area of ​​the graphene thin film at the aforementioned size may be 150 Ω or more and 300 Ω or less. If the graphene thin film contains three graphene layers, the area of ​​the graphene thin film at the aforementioned size may be 100 Ω or more and 200 Ω or less. If the graphene thin film contains four graphene layers, the area of ​​the graphene thin film at the aforementioned size may be 80 Ω or more and 150 Ω or less. If the graphene thin film contains five graphene layers, the area of ​​the graphene thin film at the aforementioned size may be 60 Ω or more and 100 Ω or less.

[0055] According to one embodiment of the present invention, the thickness of the graphene thin film may be between 0.35 nm and 2.0 nm. For example, if the graphene thin film includes a single (1 layer) graphene layer, the thickness of the graphene thin film may be 0.35 nm. Also, if the graphene thin film includes five layers of graphene, the thickness of the graphene thin film may be 1.75 nm. When the thickness of the graphene thin film is within the above-mentioned range, the heating efficiency of the transparent heating element can be increased and the manufacturing cost of the variable heating device can be reduced.

[0056] Figure 2A is a schematic plan view of a variable heating device according to one embodiment of the present invention, Figure 2B is a schematic cross-sectional view of the variable heating device along line AB in Figure 2A, and Figure 2C is a schematic cross-sectional view of the variable heating device along line CD in Figure 2A.

[0057] According to one embodiment of the present invention, the first transparent heating section includes a first transparent substrate on which the first transparent heating element is provided, and a second transparent substrate facing the first transparent substrate with the first transparent heating element in between; the second transparent heating section includes a third transparent substrate on which the second transparent heating element is provided, and a fourth transparent substrate facing the third transparent substrate with the second transparent heating element in between; the first transparent substrate and the second transparent substrate are sealed to form an air gap between the first transparent substrate and the second transparent substrate; and the third transparent substrate and the fourth transparent substrate are sealed to form an air gap between the third transparent substrate and the fourth transparent substrate.

[0058] Referring to Figures 2A to 2C, the first transparent heating element 111 is provided on one surface of the first transparent substrate 112, and the second transparent substrate 113 is provided separated from the first transparent substrate 112, with the first transparent heating element 111 in between. That is, an air gap AG is formed between the first transparent substrate 112 and the second transparent substrate 113, and the first transparent heating element 111 can be positioned within the air gap AG. Also, the second transparent heating element 121 is provided on one surface of the third transparent substrate 122, and the fourth transparent substrate 123 is provided separated from the third transparent substrate 122, with the second transparent heating element 121 in between. That is, an air gap AG is formed between the third transparent substrate 122 and the fourth transparent substrate 123, and the second transparent heating element 121 can be positioned within the air gap AG.

[0059] The first transparent substrate equipped with the first transparent heating element and the third transparent substrate equipped with the second transparent heating element correspond to the heating portion of the object, while the second and fourth transparent substrates correspond to the unheated portion of the object. In this case, by forming an air gap between the first and second transparent substrates and between the third and fourth transparent substrates, the heat emitted from the first and second transparent heating elements can effectively heat the object via the first and third transparent substrates, while simultaneously effectively suppressing the release of heat to the second and fourth transparent substrates. This can further improve the operational stability of the variable heating device.

[0060] According to one embodiment of the present invention, the first to fourth transparent substrates can be any substrate used in the industry that has a predetermined strength and is transparent. For example, the first to fourth transparent substrates may be glass or a polymer film. In this case, the glass may be physically and / or chemically strengthened. The polymer film may include at least one of PET (Polyethylene Terephthalate), PMMA [poly(methyl methacrylate)], PVDF [Poly(viniylidine flouride)], and PANI (polyaniline), but the type of polymer film is not limited.

[0061] According to one embodiment of the present invention, the ratio of the thicknesses of the first transparent substrate and the second transparent substrate may be 1:0.1 to 1:10. Specifically, referring to Figures 2A and 2B, the ratio of the thickness d41 of the first transparent substrate 112 to the thickness d42 of the second transparent substrate 113 may be 1:0.1 to 1:8, 1:0.1 to 1:6, 1:1 to 1:4, 1:0.1 to 1:4, 1:0.1 to 1:2, 1:1 to 1:8, 1:1 to 1:6, or 1:1 to 1:3. More specifically, the ratio of the thicknesses of the first transparent substrate and the second transparent substrate may be 1:2 to 1:10, 1:2 to 1:8, 1:2 to 1:6, or 1:2 to 1:4. When the ratio of the thicknesses of the first transparent substrate to the second transparent substrate is within the range described above, the heat generated from the first transparent heating element can be effectively transferred to the target object via the first transparent substrate and effectively heated, while the dissipation of heat to the outside via the second transparent substrate can be suppressed, thereby improving the operational stability of the variable heating device. Preferably, the thickness of the second transparent substrate is greater than the thickness of the first transparent substrate.

[0062] Furthermore, the ratio of the thicknesses of the third transparent substrate and the fourth transparent substrate may be 1:0.1 to 1:10. Specifically, referring to Figures 2A and 2C, the ratio of the thickness d41 of the third transparent substrate 122 to the thickness d42 of the fourth transparent substrate 123 may be 1:0.1 to 1:8, 1:0.1 to 1:6, 1:1 to 1:4, 1:0.1 to 1:4, 1:0.1 to 1:2, 1:1 to 1:8, 1:1 to 1:6, or 1:1 to 1:3. More specifically, the ratio of the thicknesses of the third transparent substrate and the fourth transparent substrate may be 1:2 to 1:10, 1:2 to 1:8, 1:2 to 1:6, or 1:2 to 1:4. When the ratio of the thicknesses of the third transparent substrate to the fourth transparent substrate is within the range described above, the heat generated from the second transparent heating element can be effectively transferred to the target object via the third transparent substrate and effectively heated, and the dissipation of heat to the outside via the fourth transparent substrate can be suppressed, thereby improving the operational stability of the variable heating device. Preferably, the thickness of the fourth transparent substrate is greater than the thickness of the third transparent substrate.

[0063] According to one embodiment of the present invention, the thickness of each of the first to fourth transparent substrates may be 0.5 mm or more and 5 mm or less. Specifically, the thickness of each of the first to fourth transparent substrates may be 0.5 mm or more and 4.5 mm or less, 0.5 mm or more and 4 mm or less, 0.5 mm or more and 3.5 mm or less, or 0.5 mm or more and 3 mm or less. When the thickness of each of the first to fourth transparent substrates is within the above range, the variable heating device can effectively heat the target object, increase its operational stability, and effectively reduce the total thickness and weight of the variable heating device to improve its ease of use.

[0064] According to one embodiment of the present invention, the ratio of the thickness of the first transparent heating element to the thickness of the first transparent substrate is 1:0.1 × 10 6 ~1:10 x 10 6 This may also be the case. Specifically, referring to Figures 2A and 2B, the ratio of the thickness d41 of the graphene thin film contained in the first transparent heating element 111 to the thickness d41 of the first transparent substrate 112 is 1:0.1 × 10 6 ~1:10 x 10 6 , 1:0.2×10 6 ~1:9×10 6 , 1:0.5×10 6 ~1:8.5×10 6 , 1:1 × 10 6 ~1:7×10 6 , 1:2.5×10 6 ~1:5.5×10 6 , 1:0.2×10 6 ~1:2.5×10 6 , 1:0.25×10 6 ~1:2×10 6 , 1:5×10 6 ~1:10 x 10 6 , or 1:7.5×10 6 ~1:10 x 10 6 This may also be the case. When the ratio of the thickness of the first transparent heating element to the thickness of the first transparent substrate is within the range described above, the heat generated from the first transparent heating element is easily transferred to the first transparent substrate, and the object to be heated can be heated effectively.

[0065] Furthermore, the ratio of the thickness of the second transparent heating element to the thickness of the third transparent substrate is 1:0.1 × 10 6 ~1:10 x 10 6 This may also be the case. Specifically, referring to Figures 2A and 2C, the ratio of the thickness d41 of the graphene thin film contained in the second transparent heating element 121 to the thickness d41 of the third transparent substrate 122 is 1:0.1 × 10 6 ~1:10 x 10 6 , 1:0.2×10 6 ~1:9×10 6 , 1:0.5×10 6 ~1:8.5×10 6 , 1:1 × 10 6 ~1:7×10 6 , 1:2.5×10 6 ~1:5.5×10 6 , 1:0.2×10 6 ~1:2.5×10 6 , 1:0.25×10 6 ~1:2×10 6 , 1:5×10 6 ~1:10 x 10 6 , or 1:7.5×10 6 ~1:10 x 10 6 This may also be the case. If the ratio of the thickness of the second transparent heating element to the thickness of the third transparent substrate is within the range described above, the heat generated from the second transparent heating element can be easily transferred to the third transparent substrate, thereby effectively heating the target object.

[0066] According to one embodiment of the present invention, the first transparent heating section includes a first spacer provided between the first transparent substrate and the second transparent substrate to seal the first transparent substrate and the second transparent substrate, and the second transparent heating section may include a second spacer provided between the third transparent substrate and the fourth transparent substrate to seal the third transparent substrate and the fourth transparent substrate.

[0067] Referring to Figures 2A to 2C, the first spacer 191 is provided between the first transparent substrate 112 and the second transparent substrate 113, sealing the first transparent substrate 112 and the second transparent substrate 113 and forming an air gap AG between them. Similarly, the second spacer 192 is provided between the third transparent substrate 122 and the fourth transparent substrate 123, sealing the third transparent substrate 122 and the fourth transparent substrate 123 and forming an air gap AG between them.

[0068] The first spacer is provided on the outer casings of the first and second transparent substrates, surrounding the first transparent heating element, and the second spacer is provided on the outer casings of the third and fourth transparent substrates, surrounding the second transparent heating element. The first and second spacers can be spacers used in the industry, for example, silicone rubber can be used. However, the material of the first and second spacers is not limited.

[0069] According to one embodiment of the present invention, the first spacer and the second spacer may each have a thickness of 1 mm to 10 mm, 2.5 mm to 7.5 mm, 4 mm to 6 mm, 1 mm to 6 mm, 2 mm to 4 mm, 5 mm to 10 mm, or 6.5 mm to 8.5 mm. Referring to Figures 2A to 2C, when the thicknesses of the first spacer 191 and the second spacer 192 are within the aforementioned ranges, a stable air gap can be formed between the first transparent substrate 112 and the second transparent substrate 113, and between the third transparent substrate 122 and the fourth transparent substrate 123. This effectively suppresses the transfer of heat generated from the first and second transparent heating elements to the second and fourth transparent substrates, thereby increasing the operational stability of the variable heating device.

[0070] According to one embodiment of the present invention, the ratio of the thickness of the second transparent substrate to the thickness of the first spacer may be 1:0.2 to 1:25. Specifically, referring to Figures 2A and 2B, the ratio of the thickness d42 of the second transparent substrate 113 to the thickness d43 of the first spacer 191 may be 1:0.3 to 1:20, 1:1 to 1:15, 1:3 to 1:10, 1:5 to 1:7, 1:0.2 to 1:10, 1:1 to 1:7.5, 1:3 to 1:5, 1:10 to 1:25, or 1:15 to 1:20. By adjusting the ratio of the thickness of the second transparent substrate to the thickness of the first spacer within the above range, the transfer of heat generated from the first transparent heating element to the second transparent substrate can be effectively suppressed, thereby increasing the operational stability of the variable heating device. Furthermore, by adjusting the thickness of the first spacer, the thickness of the second transparent substrate can be controlled, making it easy to adjust the total thickness, weight, etc., of the variable heating device.

[0071] Furthermore, the ratio of the thickness of the fourth transparent substrate to the thickness of the second spacer may be 1:0.2 to 1:25. Specifically, referring to Figures 2A and 2C, the ratio of the thickness d42 of the fourth transparent substrate 123 to the thickness d43 of the second spacer 192 may be 1:0.3 to 1:20, 1:1 to 1:15, 1:3 to 1:10, 1:5 to 1:7, 1:0.2 to 1:10, 1:1 to 1:7.5, 1:3 to 1:5, 1:10 to 1:25, or 1:15 to 1:20. By adjusting the ratio of the thickness of the fourth transparent substrate to the thickness of the second spacer within the above range, the transfer of heat generated from the second transparent heating element to the fourth transparent substrate can be effectively suppressed, thereby increasing the operational stability of the variable heating device. Furthermore, by adjusting the thickness of the second spacer, the thickness of the fourth transparent substrate can be controlled, making it easy to adjust the total thickness, weight, etc., of the variable heating device.

[0072] According to one embodiment of the present invention, the ratio of the thickness of the first transparent heating element to the thickness of the first spacer is 1:0.5 × 10 6 ~1:30 x 10 6It may also be. Specifically, referring to FIGS. 2A and 2B, the ratio of the thickness d43 of the graphene thin film included in the first transparent heating element 111 to the first spacer 191 is 1:0.5×10 6 ~1:25×10 6 、1:0.2×10 6 ~1:20×10 6 、1:0.5×10 6 ~1:15×10 6 、1:1×10 6 ~1:10×10 6 、1:2.5×10 6 ~1:7.5×10 6 、1:0.5×10 6 ~1:10×10 6 、1:1×10 6 ~1:7×10 6 、or 1:2×10 6 ~1:6×10 6 It may also be. When the ratio of the thickness of the first transparent heating element to the thickness of the first spacer is within the above-mentioned range, the distance between the first transparent heating element and the second transparent substrate is appropriately adjusted, and the heat generated from the first transparent heating element can be easily transmitted to the first transparent substrate, and at the same time, the heat transfer to the second transparent substrate can be effectively suppressed.

[0073] Also, the ratio of the thickness of the second transparent heating element to the thickness of the second spacer may be 1:0.5×10 6 ~1:30×10 6 It may also be. Specifically, referring to FIGS. 2A and 2C, the ratio of the thickness d43 of the graphene thin film included in the second transparent heating element 121 to the second spacer is 1:0.5×10 6 ~1:25×10 6 、1:0.2×10 6 ~1:20×10 6 、1:0.5×10 6 ~1:15×10 6 、1:1×10 6 ~1:10×10 6 、1:2.5×10 6 ~1:7.5×10 6 、1:0.5×10 6~1:10 x 10 6 , 1:1 × 10 6 ~1:7×10 6 , or 1:2 × 10 6 ~1:6×10 6 This may also be the case. When the ratio of the thickness of the second transparent heating element to the thickness of the second spacer is within the range described above, the distance between the second transparent heating element and the fourth transparent substrate can be appropriately adjusted so that the heat generated from the second transparent heating element is easily transferred to the third transparent substrate, while at the same time, the transfer of heat to the fourth transparent substrate can be effectively suppressed.

[0074] According to one embodiment of the present invention, the air gap may contain an inert gas. Specifically, the air gap formed between the first transparent substrate and the second transparent substrate, and the air gap formed between the third transparent substrate and the fourth transparent substrate, may contain at least one inert gas from nitrogen, argon, and helium. More specifically, the gaps between the first transparent substrate and the second transparent substrate, and between the third transparent substrate and the fourth transparent substrate, can be filled with at least one inert gas from nitrogen, argon, and helium to form an air gap. The inclusion of an inert gas in the air gap prevents oxidation of the graphene thin film contained in the first and second transparent heating elements, thereby improving the long-term reliability and durability of the variable heating device.

[0075] According to one embodiment of the present invention, the first transparent heating section may further include an electrode connected to the first transparent heating element, and the second transparent heating section may further include an electrode connected to the second transparent heating element. Specifically, the first transparent heating section may include a pair of electrodes connected to the first transparent heating element, and the second transparent heating section may include a pair of electrodes connected to the second transparent heating element. In this case, the electrodes are provided at the end of the transparent heating element, the top of the transparent heating element, or the bottom of the transparent heating element. However, the position of the electrodes provided on the transparent heating element can be varied in various ways depending on the design.

[0076] Figures 2A to 2C show a variable heating device according to one embodiment of the present invention, in which a pair of electrodes 141a and 141b included in the first transparent heating section 110 are provided at both ends of the first transparent heating element 111, and a pair of electrodes 142a and 142b included in the second transparent heating section 120 are provided at both ends of the second transparent heating element 121. On the other hand, unlike those shown in Figures 2A to 2C, when the electrodes are provided at the bottom of the transparent heating element, the stacking order can be transparent substrate / electrode / transparent heating element / transparent substrate. Also, when the electrodes are provided at the top of the transparent heating element, the stacking order can be transparent substrate / transparent heating element / electrode / transparent substrate. On the other hand, when the electrodes are provided on the top or bottom of the transparent heating element, the transparent heating element may be provided on the entire area of ​​one surface of the transparent substrate excluding the area where the spacer is provided.

[0077] The electrode material can be one that is commonly used in this industry. Furthermore, the electrode is formed by patterning a microstructure.

[0078] Referring to Figures 2A to 2C, the AB line and the CD line can correspond to the long axis directions of the first transparent heating element 111 and the second transparent heating element 121, and the direction perpendicular to the AB line and the CD line can correspond to the short axis directions of the first transparent heating element 111 and the second transparent heating element 121. That is, the electrodes 141a, 141b, 142a, and 142b are provided continuously at both ends of the first and second transparent heating elements 111 and 121 along the short axis directions of the first and second transparent heating elements 111 and 121.

[0079] Figure 3A is a schematic plan view of a variable heating device according to one embodiment of the present invention, and Figure 3B is a schematic cross-sectional view of the variable heating device along the line AB in Figure 3A. Referring to Figures 3A and 3B, the direction of the line AB can correspond to the short axis direction of the first transparent heating element 111 and the second transparent heating element 121, and the direction perpendicular to the line AB can correspond to the long axis direction of the first transparent heating element 111 and the second transparent heating element 121.

[0080] According to one embodiment of the present invention, the electrodes are provided along the longitudinal axis of the transparent heating section. Referring to Figures 3A and 3B, the electrodes 141a, 141b, 142a, and 142b are provided continuously along the longitudinal axis of the first and second transparent heating elements 111 and 121 at both ends of the first and second transparent heating elements 111 and 121. By providing the electrodes continuously along the longitudinal axis of the transparent heating elements, the heating efficiency and heat dissipation efficiency of the transparent heating elements can be improved.

[0081] According to one embodiment of the present invention, the electrode is a transparent electrode. By using a transparent electrode, the transparency of the transparent heating section can be further ensured.

[0082] For example, the electrode may be a transparent electrode containing ITO (Indium Tin Oxide), graphene, or carbon nanotube (CNT). In this case, if the electrode contains graphene, the transparent heating element can be manufactured as a graphene-integrated unit by forming a graphene electrode by creating a fine pattern structure of graphene for electrode formation, and then transferring the graphene layer.

[0083] On the other hand, by using an electrode that is not a transparent electrode but has a fine pattern structure, the transparency of the transparent heating section can be ensured in a way that it is not visible to the user.

[0084] According to one embodiment of the present invention, by forming electrodes with a fine pattern structure on a transparent heating element (graphene layer), highly efficient and uniform heat can be generated across the entire surface of the transparent heating element. For example, the electrodes are formed in a fine pattern structure on the upper and / or lower part of the graphene layer, and multiple electrodes can be connected in series or parallel, in which case the amount of heat generated can be increased.

[0085] In the transparent heating element including the electrodes with the fine pattern structure, after forming the electrodes into a fine pattern by a masking process, a graphene layer that acts as a transparent heating element can be formed on the formed fine pattern of electrodes. Alternatively, a graphene layer that acts as a transparent heating element can be formed on one surface of a transparent substrate first, and then a graphene film with a fine pattern that acts as an electrode can be formed on the graphene layer.

[0086] According to one embodiment of the present invention, the transparent heating section may further include a metal layer provided on the transparent substrate. That is, the first transparent heating section may include a first metal layer provided between the first transparent substrate and the first transparent heating element, and the second transparent heating section may include a second metal layer provided between the second transparent substrate and the second transparent heating element.

[0087] The metal layer is provided on the entire surface or a portion of the transparent substrate. The metal layer can improve heat generation and heat dissipation efficiency by allowing current to flow more easily between the two electrodes even when a small number of graphene layers are transferred onto the transparent substrate, increasing the surface area and decreasing the surface resistance (or sheet resistance) to generate higher heat and allow the generated heat to dissipate more quickly.

[0088] The metal layer 130 may, but is not limited to, contain one or more metals or alloys selected from the group consisting of Ni, Co, Fe, Pt, Au, Al, Cr, Cu, Mg, Mn, Mo, Rh, Si, Ta, Ti, W, U, V, Zr, brass, bronze, cupronickel, stainless steel, and Ge.

[0089] Furthermore, if the metal layer is formed on the transparent substrate, the metal layer can act as a catalyst for the formation of the graphene layer. By providing a reaction gas containing a carbon source and heat to the transparent substrate on which the metal layer is formed and causing a reaction, a transparent heating element can be manufactured directly without another transfer process to form the graphene layer.

[0090] According to one embodiment of the present invention, the method for forming the transparent heating element (graphene) on the transparent substrate is as follows.

[0091] First, a transparent substrate is prepared, and a graphene layer is formed on one surface of the transparent substrate. To form the graphene layer on the transparent substrate, a graphene layer formed on another substrate can be transferred onto the transparent substrate, or, as described above, if a metal layer is formed on the transparent substrate, the graphene layer can be formed directly on the metal layer on the transparent substrate.

[0092] For example, a graphene layer (transparent heating element) can be formed on a transparent substrate by transferring a graphene layer formed by reacting a metal catalyst with a reaction gas containing a carbon source and heat to one surface of the transparent substrate. The carbon source can be, for example, carbon monoxide, carbon dioxide, methane, ethane, ethylene, ethanol, acetylene, propane, butane, butadiene, pentane, pentene, cyclopentadiene, hexane, cyclohexane, benzene, toluene, etc., as a gas phase while heat-treating at a temperature of, for example, 300°C to 2000°C. The carbon components present in the carbon source will bond together to form a hexagonal plate-like structure, and the graphene layer will grow. The metal catalyst layer is formed to facilitate the growth of the graphene film on the substrate, and the material of the metal catalyst layer can be used without any special restrictions. For example, the metal catalyst layer may be one or more metals or alloys selected from the group consisting of Ni, Co, Fe, Pt, Au, Al, Cr, Cu, Mg, Mn, Mo, Rh, Si, Ta, Ti, W, U, V, Zr, brass, bronze, cupronickel, stainless steel, and Ge. The thickness of the metal catalyst layer is not particularly limited and may be a thin film or a thick film. The method for forming the graphene layer may be any method commonly used in the industry for graphene growth, without any particular limitations, such as chemical vapor deposition, but is not limited thereto.The chemical vapor deposition method may include, but is not limited to, high-temperature chemical vapor deposition (Rapid Thermal Chemical Vapor Deposition; RTCVD), inductively coupled plasma-chemical vapor deposition (ICP-CVD), low-pressure chemical vapor deposition (LPCVD), atmospheric pressure chemical vapor deposition (APCVD), metal-organic chemical vapor deposition (MOCVD), and plasma-enhanced chemical vapor deposition (PECVD).

[0093] The process of growing the graphene layer can be carried out under atmospheric pressure, low pressure, or vacuum. For example, when the process is carried out under atmospheric pressure, damage to the graphene caused by collisions with heavy argon (Ar) at high temperatures can be minimized by using helium (He) or the like as a carrier gas. Furthermore, when the process is carried out under atmospheric pressure, there is an advantage in that large-area graphene films can be manufactured in a low-cost and simple process. Also, when the process is carried out under low pressure or vacuum conditions, high-quality graphene can be synthesized by using hydrogen (H2) as an atmospheric gas and increasing the temperature during the process by reducing the oxidized surface of the metal catalyst. The graphene layer formed by the above method may have a large area with a length in the lateral and / or vertical directions of approximately 1 mm or more to approximately 1000 m. Furthermore, the graphene film has a homogeneous structure with few defects. The graphene layer produced by the above method may include a single layer or multiple layers of graphene. As a non-limiting example, the thickness of the graphene film can be adjusted in the range of 1 to 100 layers.

[0094] Thereafter, the graphene layer can be transferred onto a transparent substrate by various processes. The transfer method is not limited to any method commonly used in the industry for transferring and coating the graphene layer onto the substrate, and can include, for example, a dry process, a wet process, a spray process, or a roll-to-roll process.

[0095] The roll-to-roll transfer method described above is useful as a method for transferring large-area graphene layers. For example, to form a graphene layer as a transparent heating element, a large-area graphene layer can be transferred to a transparent substrate (a transparent flexible substrate described later) using the roll-to-roll process. Furthermore, if the electrode is a transparent electrode containing graphene, the graphene layer can be transferred onto the transparent substrate using the roll-to-roll process to freely form a fine graphene electrode pattern.

[0096] The roll-to-roll transfer method described above includes rolling a flexible substrate on which graphene is formed and a target substrate in contact with the graphene using a transfer roller to transfer the graphene film onto the target substrate, but more specifically, it may include three steps. The three steps include forming a laminate of graphene growth support-graphene film-flexible substrate by rolling graphene formed on a graphene growth support and a flexible substrate in contact with the graphene using a first roller of an adhesive roller; etching the graphene growth support and transferring the graphene film onto the flexible substrate by impregnating and passing the laminate through an etching solution using a second roller; and transferring the graphene film onto the target substrate by rolling the flexible substrate on which the graphene film has been transferred and the target substrate in contact with the graphene film using a third roller of a transfer roller.

[0097] Finally, after transferring the graphene layer onto the transparent substrate, electrodes can be formed on both ends of the graphene layer or on the top and / or bottom of the graphene layer.

[0098] According to one embodiment of the present invention, the folding section connects the first transparent heating section and the second transparent heating section, and is configured to allow the second transparent heating section to move relative to the first transparent heating section, and any folding section used in the industry can be used without limitation. For example, the folding section can be hinged to the first and second transparent heating sections, allowing the second transparent heating section to move relative to the first transparent heating section by hinge. Alternatively, the folding section can be made of an elastic material such as rubber, and the variable heating device can be folded by the elasticity of the folding section.

[0099] Figure 4A is a schematic diagram showing a variable heating device according to one embodiment of the present invention in a detached state.

[0100] According to one embodiment of the present invention, the folding portion is detachable from the first transparent heating portion and the second transparent heating portion. Referring to Figure 3B, the folding portion 130 is attached to the first transparent heating portion 110 and the second transparent heating portion 120 to provide a variable heating device. On the other hand, referring to Figures 3B and 4A, the first transparent heating portion and the second transparent heating portion can be separated by detaching the folding portion 130 from the first transparent heating portion 110 and the second transparent heating portion 120. This allows the first transparent heating portion and the second transparent heating portion to be used separately. That is, the user can use it as a variable heating device or as two separate heating devices by detaching the folding portion considering the size and type of the object to be heated.

[0101] Figure 4B shows how the folding section of a variable heating device according to one embodiment of the present invention deforms to adjust the distance between the first transparent heating section and the second transparent heating section.

[0102] According to one embodiment of the present invention, the folding section can adjust the distance between the first transparent heating section and the second transparent heating section. When the variable heating device 100 is used in the folded state as shown in Figure 1A, the object to be heated can be easily positioned between the first transparent heating section 110 and the second transparent heating section 120 by adjusting the folding section 130 according to the thickness of the object to be heated. For example, when the variable heating device in the folded state is used as a toaster, the folding section can be deformed according to the thickness of the bread to be toasted, allowing the bread to be easily positioned between the first transparent heating section and the second transparent heating section for toasting.

[0103] Furthermore, when the variable heating device 100 is used in an extended state as shown in Figure 1B, the distance between the first transparent heating section 110 and the second transparent heating section 120 can be adjusted to improve the user's ease of use.

[0104] The folding section allows for adjustment of the distance between the first heating section and the second heating section, and any configuration that connects two objects while simultaneously adjusting their distance can be used without limitation in this industry. For example, as shown in Figures 3B and 4B, the folding section 130 is configured in a two-stage folding manner, allowing for adjustment of the distance between the first transparent heating section 110 and the second transparent heating section 120.

[0105] Figure 5A is a schematic plan view of a variable heating device according to one embodiment of the present invention, and Figure 5B is a schematic cross-sectional view of the variable heating device along line AB in Figure 5A.

[0106] According to one embodiment of the present invention, the variable heating device further includes a transparent flexible substrate, the transparent flexible substrate including a first transparent heating region provided with the first transparent heating section, a second transparent heating region provided with the second transparent heating section, and a folding region located between the first transparent heating section and the second transparent heating section, wherein the folding section may be a portion of the transparent flexible substrate corresponding to the folding region.

[0107] According to one embodiment of the present invention, the variable heating device may include a transparent flexible substrate. Referring to Figures 5A and 5B, the variable heating device 100 includes a transparent flexible substrate 150 and a first transparent heating section 110 and a second transparent heating section 120 provided on one surface thereof.

[0108] Referring to Figures 5A and 5B, the transparent flexible substrate 150 includes a first transparent heating region HZ1 where the first transparent heating section 110 is provided, a second transparent heating region HZ2 where the second transparent heating section 120 is provided, and a folding region FZ located between the first transparent heating section 110 and the second transparent heating section 120, wherein the folding region may be the part of the transparent flexible substrate 150 corresponding to the folding region FZ. Electrodes 141a and 142a are provided on the folding region FZ of the transparent flexible substrate 50.

[0109] According to one embodiment of the present invention, by using a flexible transparent substrate as the substrate on which the first and second transparent heating sections are provided, another configuration for folding the variable heating device can be omitted. That is, the portion of the transparent flexible substrate that does not have the first and second transparent heating sections can be used as the folding section.

[0110] A transparent and flexible substrate can be used as the transparent flexible substrate. For example, the transparent flexible substrate can be a polyimide film, a polyester film, etc., but the type of transparent flexible substrate is not limited.

[0111] Figure 6A is a schematic plan view of a variable heating device equipped with a control unit, temperature display unit, drive time control unit, and light-emitting element according to one embodiment of the present invention, and Figure 6B is a schematic plan view of a variable heating device equipped with a control unit, temperature display unit, drive time control unit, and video display unit according to one embodiment of the present invention. For the sake of explanation, the configuration of the first transparent heating element and electrodes included in the first transparent heating unit and the configuration of the second transparent heating element and electrodes included in the second transparent heating unit are omitted in Figures 6A and 6B.

[0112] According to one embodiment of the present invention, the present invention may further include a first temperature control unit connected to the first transparent heating element for controlling the degree of heating of the first transparent heating element, and a second temperature control unit connected to the second transparent heating element for controlling the degree of heating of the second transparent heating element.

[0113] Referring to Figures 6A and 6B, a first temperature control unit 161 is provided on the surface of the first transparent heating unit 110, and a second temperature control unit 162 is provided on the surface of the second transparent heating unit 120. The first and second temperature control units 161 and 162 can be used with any configuration used in the industry to adjust the driving temperature of the heating device.

[0114] The first temperature control unit is connected to the first transparent heating element and controls its operating temperature, and the second temperature control unit is connected to the second transparent heating element and controls its operating temperature. In other words, the operating temperatures of the first and second transparent heating elements can be controlled independently. According to one embodiment of the present invention, the present invention may further include a first display unit connected to the first transparent heating element and displaying driving information including the temperature and operating time of the first transparent heating element, and a second display unit connected to the second transparent heating element and displaying driving information including the temperature and operating time of the second transparent heating element. Referring to Figures 6A and 6B, the first transparent heating unit 110 is provided with the first display unit 171, and the second transparent heating unit 120 is provided with the second display unit 172.

[0115] The display unit is connected to the transparent heating element and can display driving information of the transparent heating element to the user, and can use display elements used in this industry. In particular, by using a transparent display element as the display unit, the transparency of the transparent heating element can be ensured.

[0116] The variable heating device may further include a temperature sensor unit connected to the transparent heating element for measuring its temperature, and the display unit can display the temperature of the transparent heating element in conjunction with the temperature sensor unit. The temperature of the transparent heating element displayed on the display unit can be shown in various forms that allow the user to see the temperature information, such as numbers, gauges, and hues.

[0117] According to one embodiment of the present invention, the first display section and the second display section may each include a light-emitting element that changes color according to the temperature of the transparent heating element. Referring to Figure 6A, light-emitting elements (LEDs) are provided at both ends of the first and second transparent heating sections 110 and 120. The light-emitting elements can be any light-emitting elements used in the industry, for example, an OLED element can be used.

[0118] The light-emitting element can be linked to the temperature sensor to emit different colors depending on the temperature of the transparent heating element. For example, when the temperature of the transparent heating element is low, the light-emitting element emits blue light; when the temperature of the transparent heating element rises to a certain extent, the light-emitting element emits green light; and when the temperature of the transparent heating element becomes high, the light-emitting element emits red light.

[0119] According to one embodiment of the present invention, the system may further include a first drive time control unit connected to the first transparent heating element and controlling the drive time of the first transparent heating element, and a second drive time control unit connected to the second transparent heating element and controlling the drive time of the second transparent heating element. Referring to Figures 6A and 6B, the first transparent heating unit 110 is provided with the first drive time control unit 181, and the second transparent heating unit 120 is provided with the second drive time control unit 182. The drive time control unit can set the drive time of the transparent heating element in advance, and the set time can be displayed through the display unit.

[0120] According to one embodiment of the present invention, at least one of the first transparent heating section and the second transparent heating section may further include a video display section that outputs an image. Referring to Figure 6B, the first transparent heating section 110 may include a first video display section 173a, and the second transparent heating section 120 may include a second video display section 173b.

[0121] The video display unit can output images pre-set by the user. For example, the video display unit can output a variety of images such as natural landscapes, specific buildings, bonfires, and braziers. In particular, by using a transparent display element as the video display unit, the transparency of the transparent heating unit can be ensured. When the video display unit is provided in the first transparent heating unit, the video display unit is provided in the air gap space formed between the first transparent substrate and the second transparent substrate. For example, the video display unit can be provided on the second transparent substrate and positioned opposite the first transparent heating element.

[0122] According to one embodiment of the present invention, the first transparent heating section may include a first transparent molding section provided on the first transparent heating element, and the second transparent heating section may include a second transparent molding section provided on the second transparent heating element. The transparent molding section may be a member capable of molding an object to be heated into a predetermined shape. For example, the first and second transparent molding sections may be waffle-shaped films, taiyaki-shaped films, and the like. The first and second transparent molding sections can be used to mold the shape of an object to be heated by the first and second transparent heating sections. The first and second transparent molding sections are detachable from the first and second transparent heating sections. The first and second transparent molding sections can be made of a transparent material with excellent thermal conductivity.

[0123] According to one embodiment of the present invention, the light transmittance of the first transparent heating section and the second transparent heating section may be 50% or more and 99% or less. Specifically, the light transmittance of the first and second transparent heating sections may be 60% or more and 99% or less, 70% or more and 99% or less, 80% or more and 95% or less, or 85% or more and 90% or less. In this case, the light transmittance of the first and second transparent heating sections may be measured at a wavelength of 550 nm. Therefore, the first and second transparent heating sections have excellent light transmittance, and the state of the object being heated by the first and second transparent heating sections can be easily confirmed.

[0124] Figures 7A to 7D show electrodes included in a variable heating device according to one embodiment of the present invention. Specifically, Figures 7A to 7D mainly show the first transparent heating section, and the second transparent heating section may also have the same electrode structure as shown in Figures 7A to 7D. On the other hand, the form of the electrodes according to one embodiment of the present invention is not limited to Figures 7A to 7D.

[0125] Figure 7A is a plan view of the first transparent heating section 110, which includes the first electrode 141a, the second electrode 141b, the first auxiliary electrode 141c, the second auxiliary electrode 141d, and the first transparent heating element 111. Figure 7B is an enlarged view of the area indicated by the circle in Figure 7A. Figure 7C is an enlarged view of the second auxiliary electrode 141d. Figure 7D shows the configuration of the first and second auxiliary electrodes 141c and 141d provided on the first transparent substrate 112.

[0126] Referring to Figure 7A, the length of the long side d3 of the first transparent heating section 110 may be between 200 mm and 400 mm, and the length of the short side d2 of the first transparent heating section 110 may be between 150 mm and 350 mm. When the lengths of the long side d3 and short side d2 of the first transparent heating section 110 are within the aforementioned range, the variable heating device can be made more portable and easier to store. However, the lengths of the long side and short side of the first transparent heating section may be set to a range different from the aforementioned range depending on the intended use.

[0127] Referring to Figure 7A, the ratio of the length of the short side d2 of the first transparent substrate 112 to the width d4 of the first transparent heating element 111 may be between 1:0.5 and 1:0.9. When the ratio of the length of the short side d2 of the first transparent substrate 112 to the width d4 of the first transparent heating element 111 is within the range described above, the first transparent heating section 110 can effectively heat the target object. The width d4 of the first transparent heating element 111 may be between 130 mm and 180 mm.

[0128] Referring to Figures 7A to 7D, the first and second auxiliary electrodes 141c and 141d are provided on the first transparent substrate 112, and the first transparent heating element 111 and the first and second electrodes 141a and 141b are provided on the first and second auxiliary electrodes 141c and 141d. Alternatively, the first transparent heating element 111 and the first and second electrodes 141a and 141b may be provided on the first transparent substrate 112, and the first and second auxiliary electrodes 141c and 141d may be provided on the first transparent heating element 111 and the first and second electrodes 141a and 141b.

[0129] Figure 17 is an image showing a grid-like pattern of silver (Ag) electrodes formed as auxiliary electrodes on a transparent glass substrate according to one embodiment of the present invention.

[0130] According to one embodiment of the present invention, the first and second auxiliary electrodes are provided in a ladder shape or a grid shape.

[0131] According to one embodiment of the present invention, the resistance value per unit length of the first auxiliary electrode and the second auxiliary electrode may be 0.001 Ω / cm or more and 4 Ω / cm or less, 0.003 Ω / cm or more and 3.5 Ω / cm or less, 0.01 Ω / cm or more and 3 Ω / cm or less, 0.05 Ω / cm or more and 2.5 Ω / cm or less, 0.1 Ω / cm or more and 2 Ω / cm or less, 0.1 Ω / cm or more and 2 Ω / cm or less, 0.1 Ω / cm or more and 1.5 Ω / cm or less, or 0.1 Ω / cm or more and 1 Ω / cm or less. For example, with respect to 30 cm of the first auxiliary electrode (second auxiliary electrode), the resistance value may be 0.1 Ω or more and 100 Ω or less, 1 Ω or more and 80 Ω or less, 2 Ω or more and 50 Ω or less, or 3 Ω or more and 30 Ω or less.

[0132] When the resistance values ​​of the first auxiliary electrode and the second auxiliary electrode are within the range described above, the first transparent heating element is connected to the first electrode via the first auxiliary electrode, and the first transparent heating element is connected to the second electrode via the second auxiliary electrode, thereby enabling efficient current distribution to the first transparent heating element and improving the heating efficiency of the first transparent heating element.

[0133] The height (or thickness) of the first auxiliary electrode and the second auxiliary electrode may be between 10 nm and 3 μm, or between 100 nm and 3 μm. When the heights of the first auxiliary electrode and the second auxiliary electrode are within the aforementioned range, the current can be efficiently supplied to the first transparent heating element, and the heating efficiency of the first transparent heating element can be improved.

[0134] The first auxiliary electrode and the second auxiliary electrode can be manufactured using electrode materials used in the industry; for example, they can be manufactured using silver (Ag). Furthermore, the first electrode and the second electrode can be manufactured using electrode materials used in the industry; for example, they can be manufactured using copper (Cu).

[0135] According to one embodiment of the present invention, the resistance value per unit length of the first electrode and the second electrode may be 0.01 Ω / cm or more and 2 Ω / cm or less, 0.05 Ω / cm or more and 1.5 Ω / cm or less, or 0.1 Ω / cm or more and 1 Ω / cm or less. For example, with respect to a first electrode (second electrode) of 30 cm, the resistance value may be 0.1 Ω or more and 10 Ω or less. When the resistance values ​​of the first electrode and the second electrode are within the above-mentioned range, the current can be efficiently supplied to the first transparent heating element, and the heating efficiency of the first transparent heating element can be improved. Furthermore, the height (or thickness) of the first electrode and the second electrode may be 0.5 μm or more and 3 μm or less. When the heights of the first electrode and the second electrode are within the above-mentioned range, the current can be efficiently supplied to the first transparent heating element, and the heating efficiency of the first transparent heating element can be improved.

[0136] Referring to Figures 7A to 7D, the first transparent heating element 111 is positioned between the first and second auxiliary electrodes 141c and 141d, and overlaps with the first and second auxiliary electrodes 141c and 141d. On the other hand, the first transparent heating element 111 is positioned separately from the first and second electrodes 141a and 141b. That is, the first electrode 141a is connected to the first transparent heating element 111 via the first auxiliary electrode 141c, and the second electrode 141b is connected to the first transparent heating element 111 via the second auxiliary electrode 141d.

[0137] As described above, by connecting the first transparent heating element to the first electrode via a first auxiliary electrode, and connecting the first transparent heating element to the second electrode via a second auxiliary electrode, current can be efficiently supplied to the first transparent heating element, and the heating efficiency of the first transparent heating element can be improved.

[0138] Referring to Figures 7A to 7D, the distance d11 between the end of the first transparent substrate 112 and the second electrode 141b may be 3 mm or more and 10 mm or less. This distance d11 may be the same as the width of the first spacer. Also, the ratio of the length of the short side d2 of the first transparent substrate 112 to the distance d11 may be 1:0.01 to 1:0.05. The distance d12 between the end of the first transparent substrate 112 and the second auxiliary electrode 141d may be 3 mm or more and 10 mm or less. Also, the ratio of the length of the short side d2 of the first transparent substrate 112 to the distance d12 may be 1:0.01 to 1:0.05. The distance d13 between the end of the second electrode 141b, which is located far from the end of the first transparent substrate 112, and the end of the second auxiliary electrode 141d, which is located adjacent to the end of the first transparent substrate 112, may be 3 mm or more and 10 mm or less. Furthermore, the ratio of the length of the short side d2 of the first transparent substrate 112 to the distance d13 may be 1:0.01 to 1:0.05. The distance d14 between the first transparent heating element 111 and the second electrode 141b may be 3 mm or more and 10 mm or less. Also, the ratio of the length of the short side d2 of the first transparent substrate 112 to the distance d14 may be 1:0.01 to 1:0.05. The distance d15 between the end of the second auxiliary electrode 141d, which is located far from the end of the first transparent substrate 112, and the first transparent heating element 111 may be 3 mm or more and 10 mm or less. Note that the ratio of the length of the short side d2 of the first transparent substrate 112 to the distance d15 may be 1:0.01 to 1:0.05.

[0139] When the lengths of the distances d11 to d15 are within the range described above, the current can be effectively directed to the first transparent heating element. Also, when the ratio of the lengths between each of the distances d11 to d15 and the short side of the first transparent substrate is within the range described above, the current can be effectively directed to the first transparent heating element. The lengths of the distances d11 to d15 may be the same or different. On the other hand, the lengths of the distances d11 to d15 may be adjusted to lengths outside the range described above, depending on the application of the variable heating device.

[0140] Referring to Figure 7C, the second auxiliary electrode 141d may have a ladder shape. However, this does not limit the form of the second auxiliary electrode 141d. Referring to Figures 7A to 7C, the distance d21 in the second auxiliary electrode 141d may be 2 mm or more and 5 mm or less. Also, the ratio of the length of the long side d3 of the first transparent substrate 112 to the distance d21 may be 1:0.01 to 1:0.03. The distance d22 in the second auxiliary electrode 141d may be 1 mm or more and 5 mm or less. Furthermore, the ratio of the length of the long side d3 of the first transparent substrate 112 to the distance d22 may be 1:0.005 to 1:0.02. The distance d23 in the second auxiliary electrode 141d may be 7 mm or more and 20 mm or less. Also, the ratio of the length of the short side d2 of the first transparent substrate 112 to the distance d23 may be 1:0.005 to 1:0.02. The distance d24 at the second auxiliary electrode 141d may be between 2 mm and 5 mm. The ratio of the length of the short side d2 of the first transparent substrate 112 to the distance d24 may be between 1:0.01 and 1:0.03.

[0141] Referring to Figures 7A to 7D, the first and second auxiliary electrodes 141c and 141d are provided continuously along the long side d3 direction of the first transparent substrate 112. To form the first and second auxiliary electrodes 141c and 141d, an electrode-forming ink can be printed onto the first transparent substrate 112. For example, an ink containing silver (Ag) can be printed onto the first transparent substrate 112. Specifically, an ink containing silver nanoparticles can be used. Copper electrodes can also be used as the first and second electrodes 141a and 141b. In Figure 7D, the distance d32 between the end of the first transparent substrate 112 and the end of the first auxiliary electrode 141c may be the same as the distance d31 between the end of the first transparent substrate 112 and the end of the second auxiliary electrode 141d. At this time, the distance d31 between the end of the first transparent substrate 112 and the end of the second auxiliary electrode 141d is the same as the sum of the distances d11 and d12 in Figure 7B.

[0142] According to one embodiment of the present invention, the variable heating device may further include an additional transparent heating section and an additional folding section. For example, the variable heating device may include a first transparent heating section, a second transparent heating section, and a third transparent heating section, and may include a first folding section provided between the first and second transparent heating sections, and a second folding section provided between the second and third transparent heating sections. In this case, the variable heating device can be deformed into a "Z" shape, and the first, second, and third transparent heating sections are folded so that they overlap. Alternatively, the variable heating device may include a first transparent heating section, a second transparent heating section, a third transparent heating section, and a fourth transparent heating section, and may include a first folding section provided between the first and second transparent heating sections, a second folding section provided between the second and third transparent heating sections, and a third folding section provided between the third and fourth transparent heating sections. In this case, the variable heating device can be deformed into a "W" shape, and the first transparent heating section, the second transparent heating section, the third transparent heating section, and the fourth transparent heating section are folded so that they overlap.

[0143] According to one embodiment of the present invention, the first heating section can be manufactured by the following method, and the second heating section can also be manufactured by the same method. However, the method for manufacturing the first heating section is not limited to this.

[0144] First, a single graphene layer is synthesized on TRT (Thermal Release Tape) using the method described above. The graphene layer synthesized on the TRT is then laminated and transferred so that it is in contact with a transparent glass substrate. After heat-treating the glass / graphene layer / TRT laminate at 150°C for 1 minute, the TRT can be peeled off. This allows a graphene layer to be provided on the glass. On the other hand, if multiple graphene layers are to be formed on the glass, the above method can be repeated to provide multiple layers of graphene on the glass. Subsequently, the glass with the graphene layer is placed in an Enjet Silver Electrode Printing Apparatus, and an ink containing silver (Ag) is output to produce a form having a set thickness and length. Subsequently, the ink is cured at 200°C for 30 minutes to 1 hour to form the first and second auxiliary electrodes. Subsequently, copper foil is attached to manufacture the first and second electrodes. This makes it possible to manufacture a heating section equipped with a transparent glass substrate, a transparent graphene layer for heating, and electrodes and auxiliary electrodes.

[0145] Subsequently, silicone packing is aligned around the edge of the glass in the heating section, a new piece of glass is placed on top of the silicone packing to create a sandwich structure, an inert gas is filled in, and then a sealing process is performed to finally manufacture the heating section. For the sealing process, an adhesive or adhesive film (such as an insulating adhesive film or a PI adhesive film) can be used.

[0146] Alternatively, silver electrodes (first and second auxiliary electrodes) can be formed on glass using the method described above, and a graphene layer can be transferred onto the glass on which the silver electrodes are formed using the method described above. Thereafter, copper foil can be attached along the edges of the silver electrodes. Subsequently, a heating section can be manufactured by sealing in the same manner as described above.

[0147] Figure 8A is a schematic diagram showing a variable heating device according to one embodiment of the present invention in a folded state, and Figure 8B is a schematic diagram showing a variable heating device in an unfolded state.

[0148] The following description will focus on the differences between this embodiment and the above embodiment, and any parts that have been omitted from the explanation will be replaced by the above content. This will clarify that the embodiments described below are identical.

[0149] Referring to Figures 8A and 8B, the variable heating device 200 includes a first transparent heating section 210, a second transparent heating section 220, and a folding section 230. The first transparent heating section 210 includes a first transparent heating element 211 and a first transparent substrate 212, and the second transparent heating section 220 includes a second transparent heating element 221 and a second transparent substrate 222.

[0150] This embodiment corresponds to an embodiment in which the first and second transparent heating sections do not have an air gap, compared to the previously described embodiment.

[0151] According to one embodiment of the present invention, the first transparent heating section further includes a first transparent substrate on which the first transparent heating element is provided, and an electrode connected to the first transparent heating element, and the second transparent heating section may further include a second transparent substrate on which the second transparent heating element is provided, and an electrode connected to the second transparent heating element.

[0152] Figure 9A is a schematic plan view of a variable heating device according to one embodiment of the present invention, and Figure 9B is a schematic cross-sectional view of the variable heating device along line AB in Figure 9A.

[0153] Referring to Figures 9A and 9B, the first transparent heating element 211 is provided on the upper surface of the first transparent substrate 212, and the second transparent heating element 221 is provided on the upper surface of the second transparent substrate 222. In this case, the first transparent heating element 211 may be provided on the entire surface of the first transparent substrate 212, or on a part of the surface of the first transparent substrate 212. Similarly, the second transparent heating element 221 may be provided on the entire surface of the second transparent substrate 222, or on a part of the surface of the second transparent substrate 222.

[0154] According to one embodiment of the present invention, the electrodes are provided along the long axis direction of the transparent heating section. Referring to Figures 9A and 9B, the AB line can correspond to the short axis direction of the first transparent heating element 211 and the second transparent heating element 221. That is, the electrodes 241a, 241b, 242a, and 242b are provided continuously along the long axis direction of the first and second transparent heating elements 211 and 221, at both ends of the first and second transparent heating elements 211 and 221. By providing the electrodes continuously along the long axis direction of the transparent heating elements, the heating efficiency and heat dissipation efficiency of the transparent heating elements can be improved.

[0155] Figure 10A is a schematic plan view of a variable heating device according to one embodiment of the present invention, Figure 10B is a schematic cross-sectional view of the variable heating device along line AB in Figure 10A, and Figure 10C is a schematic cross-sectional view of the variable heating device along line CD in Figure 10A.

[0156] Referring to Figures 10A to 10C, the AB line and the CD line can correspond to the short axis directions of the first transparent heating element 211 and the second transparent heating element 221. That is, the electrodes 241a, 241b, 242a, and 242b are provided continuously at both ends of the first and second transparent heating elements 211 and 221 along the short axis directions of the first and second transparent heating elements 211 and 221.

[0157] Figure 11 is a schematic cross-sectional view of a variable heating device equipped with a transparent auxiliary layer according to one embodiment of the present invention.

[0158] According to one embodiment of the present invention, the first transparent heating section further includes the first transparent heating element and a first transparent auxiliary layer provided on the first transparent substrate, and the second transparent heating section further includes the second transparent heating element and a second transparent auxiliary layer provided on the second transparent substrate. Referring to Figure 11, the first transparent heating section 210 may have a laminated structure of a first transparent substrate 212 / first transparent auxiliary layer 213 / first transparent heating element 211, and the first transparent heating section 220 may have a laminated structure of a second transparent substrate 222 / second transparent auxiliary layer 223 / second transparent heating element 221.

[0159] The transparent auxiliary layer may be configured to effectively introduce the transparent heating element onto the transparent substrate. For example, if the transparent substrate is glass, the surface of the glass is smooth, and the process of transferring the graphene layer onto the glass, as described above, is not easy. Therefore, by introducing a transparent auxiliary layer onto the glass, the graphene layer can be introduced onto the transparent substrate more easily. Furthermore, the transparent auxiliary layer can be provided between the transparent substrate and the transparent heating element to prevent heat generated from the transparent heating element from being released to the outside through the transparent substrate, thereby improving heating efficiency and ease of use for the user.

[0160] A transparent polymer film can be used as the first and second transparent auxiliary layers. For example, the transparent auxiliary layer may include at least one of PET film, PMMA film, PVDF film, and PANI film, but the type of polymer film is not limited.

[0161] Figures 12A and 12B schematically show the state in which the folding part of a variable heating device according to one embodiment of the present invention is attached and detached.

[0162] As described in the above-described embodiment, the folding portion is detachable from the first transparent heating portion and the second transparent heating portion.

[0163] Figures 13A and 13B show how the folding section of a variable heating device according to one embodiment of the present invention deforms to adjust the distance between the first transparent heating section and the second transparent heating section.

[0164] As described in the above-mentioned embodiment, the folding section can adjust the distance between the first transparent heating section and the second transparent heating section.

[0165] Figure 14A is a schematic plan view of a variable heating device according to one embodiment of the present invention, and Figure 14B is a schematic cross-sectional view of the variable heating device along line AB in Figure 14A.

[0166] According to one embodiment of the present invention, the variable heating device may include a transparent flexible substrate. Referring to Figures 14A and 14B, the variable heating device 200 includes a transparent flexible substrate 250 and a first transparent heating section 210 and a second transparent heating section 220 provided on one surface thereof.

[0167] Referring to Figures 14A and 14B, the transparent flexible substrate 250 includes a first transparent heating region HZ1 where the first transparent heating section 210 is provided, a second transparent heating region HZ2 where the second transparent heating section 220 is provided, and a folding region FZ located between the first transparent heating section 210 and the second transparent heating section 220, wherein the folding region may be the part of the transparent flexible substrate 250 corresponding to the folding region FZ. Electrodes 241a and 242a are provided on the folding region FZ of the transparent flexible substrate 250.

[0168] According to one embodiment of the present invention, by using a flexible transparent substrate as the substrate on which the first and second transparent heating sections are provided, another configuration for folding the variable heating device can be omitted. That is, the portion of the transparent flexible substrate that does not have the first and second transparent heating sections can be used as the folding section.

[0169] Figures 15A and 15B schematically show cross-sectional views of a variable heating device equipped with a transparent protective layer according to one embodiment of the present invention.

[0170] According to one embodiment of the present invention, the first transparent heating section further includes a first transparent protective layer provided on the first transparent heating element, and the second transparent heating section may further include a second transparent protective layer provided on the second transparent heating element.

[0171] Referring to Figure 15A, a first transparent heating element 211 is provided on a first transparent substrate 212, a second transparent heating element 221 is provided on a second transparent substrate 222, a first transparent protective layer 214 is provided so as to cover the first transparent substrate 212 and electrodes 241a and 241b, and a second transparent protective layer 224 is provided so as to cover the second transparent substrate 222 and electrodes 242a and 242b.

[0172] Referring to Figure 15B, a first transparent heating element 211 and a second transparent heating element 221 are provided on a transparent flexible substrate 250, a first transparent protective layer 214 is provided to cover the first transparent substrate 212 and electrodes 241a and 241b, and a second transparent protective layer 224 is provided to cover the second transparent substrate 222 and electrodes 242a and 242b.

[0173] The first and second transparent protective layers protect the first and second transparent heating elements and electrodes by preventing them from coming into direct contact with the object to be heated. Furthermore, the first and second transparent protective layers allow heat generated from the surface of the first and second transparent heating elements to be released uniformly to the surrounding area rather than being immediately released. Glass or a transparent polymer film can be used as the first and second transparent protective layers. For example, the glass used as the first and second transparent protective layers may be mechanically and / or chemically strengthened glass. The first and second transparent protective layers may also include, but are not limited to, at least one of PET film, PMMA film, PVDF film, and PANI film.

[0174] On the other hand, although not shown in Figure 15A, the first transparent heating section may include a third transparent protective layer provided at the bottom of the first transparent substrate, and the second transparent heating section may include a fourth transparent protective layer at the bottom of the second transparent substrate. Also, although not shown in Figure 15B, a fifth transparent protective layer may be provided at the bottom of the transparent flexible substrate. The third to fifth transparent protective layers are provided at the bottom of the first and second transparent substrates and the transparent flexible substrate, preventing heat generated from the first and second transparent heating elements from being released to the outside, thereby improving the heating efficiency of the variable heating device and preventing the user from being injured by heat. The third to fifth transparent protective layers can be made of glass or a transparent polymer film. For example, the glass used as the third to fifth transparent protective layers may be mechanically and / or chemically strengthened glass. The polymer film may include at least one of PET film, PMMA film, PVDF film, and PANI film, but is not limited to the type of polymer film.

[0175] Figure 16 is a cross-sectional view of a variable heating device according to one embodiment of the present invention.

[0176] Referring to Figure 16, the first transparent heating section 210 may have a structure in which a first transparent substrate 212, a first transparent auxiliary layer 213, a first transparent heating element 211, a third transparent auxiliary layer 215, and a first transparent protective layer 214 are sequentially laminated. Similarly, the second transparent heating section 220 may have a structure in which a second transparent substrate 222, a second transparent auxiliary layer 223, a second transparent heating element 221, a fourth transparent auxiliary layer 225, and a second transparent protective layer 224 are sequentially laminated. The third and fourth transparent auxiliary layers may have the same configuration as the first and second transparent auxiliary layers described above.

[0177] For example, in the first transparent heating section 210, glass can be used as the first transparent substrate 212, a polyimide film as the first transparent auxiliary layer 213, graphene as the first transparent heating element 211, a polyimide film as the third transparent auxiliary layer 215, and glass as the first transparent protective layer 214. However, the types of the first transparent substrate 212, the first transparent auxiliary layer 213, the first transparent heating element 211, the third transparent auxiliary layer 215, and the first transparent protective layer 214 are not limited.

[0178] Referring to Figure 16, the thickness d1 of the first transparent heating section 210 and the second transparent heating section 220 may be 4 mm or more and 10 mm or less. When the thickness of the first and second transparent heating sections is within the aforementioned range, the variable heating device can ensure durability while reducing its thickness. [Explanation of Symbols]

[0179] 100: Variable heating device 110: First transparent heating section 120: Second transparent heating section 111: First transparent heating element 121: Second transparent heating element 112: First transparent base material 113: Second transparent base material 122: Third transparent base material 123: Fourth transparent base material 130: Folding section 141a, 141b, 142a, 142b: Electrode 141c: 1st auxiliary electrode 141d: 2nd auxiliary electrode 150: Transparent flexible base material 161: First temperature control unit 162: Second temperature control unit 171: First display unit 172: Second display unit 173a, 173b: Video display section 181: First drive time control unit 182: Second drive time control unit 191: First spacer 192: Second spacer 200: Variable heating device 210: First transparent heating section 220: Second transparent heating section 211: First transparent heating element 221: Second transparent heating element 212: First transparent base material 222: Second transparent base material 213: First transparent auxiliary layer 223: Second transparent auxiliary layer 214: First transparent protective layer 224: Second transparent protective layer 215: Third transparent auxiliary layer 225: Fourth transparent auxiliary layer 230: Folding section

Claims

1. A first transparent heating section including a first transparent heating element, A second transparent heating section including a second transparent heating element, A folding section provided between the first transparent heating section and the second transparent heating section, Includes, The first transparent heating section includes a first transparent substrate on which the first transparent heating element is provided, and a second transparent substrate facing the first transparent substrate with the first transparent heating element in between. The second transparent heating section includes a third transparent substrate on which the second transparent heating element is provided, and a fourth transparent substrate facing the third transparent substrate with the second transparent heating element in between. The first transparent substrate and the second transparent substrate are sealed, and an air gap is formed between the first transparent substrate and the second transparent substrate. A variable heating device in which the third transparent substrate and the fourth transparent substrate are sealed, and an air gap is formed between the third transparent substrate and the fourth transparent substrate.

2. The variable heating device according to claim 1, wherein the first transparent heating element and the second transparent heating element are graphene thin films.

3. The variable heating apparatus according to claim 2, wherein the graphene thin film comprises one or more graphene layers.

4. The variable heating device according to claim 2, wherein the graphene thin film is doped with a dopant.

5. The first transparent heating section includes a first spacer provided between the first transparent substrate and the second transparent substrate, which seals the first transparent substrate and the second transparent substrate. The variable heating device according to claim 1, wherein the second transparent heating section is provided between the third transparent substrate and the fourth transparent substrate and includes a second spacer that seals the third transparent substrate and the fourth transparent substrate.

6. The variable heating device according to claim 1, wherein the air gap contains an inert gas.

7. The first transparent heating section further includes an electrode connected to the first transparent heating element, The variable heating device according to claim 1, wherein the second transparent heating section further includes an electrode connected to the second transparent heating element.

8. The variable heating device according to claim 1, wherein the folding portion is detachable from the first transparent heating portion and the second transparent heating portion.

9. Further comprising a transparent flexible substrate, The transparent flexible substrate includes a first transparent heating region provided with the first transparent heating section, a second transparent heating region provided with the second transparent heating section, and a folding region located between the first transparent heating section and the second transparent heating section. The variable heating device according to claim 1, wherein the folding portion is the portion of the transparent flexible substrate corresponding to the folding region.

10. A first temperature control unit connected to the first transparent heating element and controlling the degree of heating of the first transparent heating element, The variable heating device according to claim 1, further comprising a second temperature control unit connected to the second transparent heating element for controlling the degree of heating of the second transparent heating element.

11. A first drive time control unit connected to the first transparent heating element and controlling the drive time of the first transparent heating element, The variable heating device according to claim 1, further comprising a second drive time control unit connected to the second transparent heating element for controlling the drive time of the second transparent heating element.

12. A first display unit connected to the first transparent heating element and displaying driving information including the temperature and operating time of the first transparent heating element, The variable heating device according to claim 1, further comprising: a second display unit connected to the second transparent heating element and displaying drive information including the temperature and operating time of the second transparent heating element.

13. The variable heating device according to claim 12, wherein each of the first display unit and the second display unit includes a light-emitting element that changes color according to the temperature of a transparent heating element.

14. The variable heating device according to claim 1, wherein at least one of the first transparent heating section and the second transparent heating section further includes a video display section that outputs an image.

15. The first transparent heating section further includes an electrode connected to the first transparent heating element, The variable heating device according to claim 1, wherein the second transparent heating section further includes an electrode connected to the second transparent heating element.

16. The first transparent heating section further includes a first transparent auxiliary layer provided between the first transparent heating element and the first transparent substrate, The variable heating device according to claim 15, wherein the second transparent heating section further includes a second transparent auxiliary layer provided between the second transparent heating element and the second transparent substrate.

17. The first transparent heating section further includes a first transparent protective layer provided on the first transparent heating element, The variable heating device according to claim 1, wherein the second transparent heating section further includes a second transparent protective layer provided on the second transparent heating element.

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