Planar heater

Abstract

To provide a planar heater in which necessary and sufficient fixing strength is secured in a heater wire and an electrical component, flatness of a surface to be attached to an instrument is secured, and a metal foil is suppressed from peeling off.SOLUTION: In a planar heater 1, in which a lengthy heater member 10 having a heater wire 11 that is supplied with electricity to produce heat is arranged on a first adhesion member 21, and a first metal foil 31 is fixed onto the first adhesion member so as to cover the lengthy heater member, a second metal foil 32 fixed to a second adhesion member 22 is folded back along an edge of the first metal foil and is fixed to the vicinity of the edge of the first metal foil through the second adhesion member, where one edge of the second metal foil is fixed onto the first adhesion member, and the other edge of the second metal foil is fixed onto the first metal foil.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a planar heater used for heating and keeping warm electronic rice cookers, foot baths, western-style toilet seats, car seats, etc.

[0002] As the main body of the equipment into which the planar heater is incorporated becomes smaller, there is a demand for further reduction in the external dimensions of the planar heater, and there are also situations where it is necessary to arrange heater wires near the edges of the planar heater to ensure temperature uniformity of the planar heater.

[0003] When arranging a heater wire near the edge of a sheet heater, it is necessary to ensure the fixing strength of the heater wire. Examples of methods for increasing the fixing strength when arranging a heater wire near the edge are described in Patent Documents 1, 2, and 3.

[0004] In Patent Document 1, when a heater wire is arranged along the edge of a double-sided adhesive sheet, the adhesive portion of the metal foil attached to the double-sided adhesive sheet is folded over and attached to the back surface of the double-sided adhesive sheet, passing through the edge of the sheet, thereby preventing the heater wire arranged near the edge of the planar heater from shifting or floating.

[0005] In Patent Document 2, in a planar heater placed on an adhesive sheet, the adhesive margin of the adhesive sheet is folded back from the outer edge of the heater wire toward the inner edge to cover the heater wire, thereby increasing the fixing strength of the heater wire.

[0006] In Patent Document 3, a planar heater is arranged on a first adhesive member, in which the long heater member is arranged on the first adhesive member wrapped in a first metal foil folded along the side of the long heater member, and the long heater member and the first metal foil are fixed via a second adhesive member, thereby ensuring the flatness of the attachment surface of the planar heater to the equipment and preventing the metal foil from peeling off.

[0007] However, in the method described in Patent Document 1, the metal foil is folded onto the back surface of the double-sided adhesive sheet, which affects the flatness of the back surface of the edge of the double-sided adhesive sheet, affecting the workability when attaching the surface heater to the equipment.

[0008] The method described in Patent Document 2 can ensure the flatness of the back surface of the double-sided pressure-sensitive adhesive sheet, but as stated in Patent Document 1, there is a problem in that the metal foil tends to peel off from the edges.

[0009] The method described in Patent Document 3 has the problem that, depending on the shape of the elongated heater member of the first adhesive member, a gap may form between the first metal foil wrapping the elongated heater member and the first adhesive member, making the first metal foil prone to peeling off.

[0010] Furthermore, planar heaters often use electrical components such as connection terminals for supplying power to the heater wire from the outside and temperature fuses that melt when overheated, cutting off the power supply to the heater wire, and these electrical components also require sufficient fixing strength when fixed near the edges of the planar heater. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-288009 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-35385 [Patent Document 3] Patent Application No. 2023-52136 Summary of the Invention [Problem to be solved by the invention]

[0012] The object of the present invention is to provide a planar heater that ensures sufficient fixing strength for heater wires and electrical components regardless of their shape, and that suppresses peeling of the metal foil while ensuring the flatness of the attachment surface to the equipment. [Means for solving the problem]

[0013] After extensive research into the structure of the planar heater, the inventors have succeeded in obtaining a planar heater that, by adopting the following structure, ensures fixing strength, ensures flatness of the attachment surface to the device, and prevents peeling of the metal foil.

[0014] (1) A planar heater in which an elongated heater member having a heater wire that generates heat when energized is disposed on a first adhesive member, and a first metal foil is fixed to the first adhesive member so as to cover the elongated heater member, When viewed in cross section on a plane perpendicular to the longitudinal direction of the elongated heater member, at least a part of a first location where the elongated heater member is disposed along an edge portion of the first adhesive member, the second metal foil fixed to the second adhesive member is folded back along the edge of the first metal foil, and is fixed to the vicinity of the edge of the first metal foil via the second adhesive member; A plane heater characterized in that one edge of the second metal foil is fixed on the first adhesive member and the other edge of the second metal foil has a fixed structure fixed on the first metal foil. (2) A planar heater in which an elongated heater member having a heater wire that generates heat when energized is disposed on a first adhesive member, and a first metal foil is fixed on the first adhesive member so as to cover the elongated heater member, When viewed in cross section on a plane perpendicular to the longitudinal direction of the elongated heater member, at least a part of a first location where the elongated heater member is disposed along an edge portion of the first adhesive member, an edge of the first metal foil has a folded edge that is folded back and overlapped on the side opposite to the side where the first adhesive member is located; the second metal foil fixed to the second adhesive member is folded back along the folded edge, and fixed to the vicinity of the folded edge of the first metal foil via the second adhesive member; A planar heater characterized by having a fixed structure in which one edge of the second metal foil is fixed on the first adhesive member and the other edge of the second metal foil is fixed on the first metal foil. (3) A planar heater according to (1) or (2), characterized in that the other edge of the second metal foil is fixed onto the first metal foil so as to cover the elongated heater member. (4) A planar heater described in any one of (1) to (3), characterized in that the elongated heater member is arranged on the first adhesive member at a second location, and the elongated heater member is covered with the first metal foil at the second location. (5) The sheet heater according to (4), wherein the second location is an area away from the edge of the first adhesive member. (6) A planar heater as described in (4) or (5), characterized in that the elongated heater element is also arranged on the first adhesive member at a third location located between the first location and the second location, and is covered by the first metal foil, and the other edge of the second metal foil is fixed on the first metal foil so as to cover the elongated heater element arranged at the third location. (7) The planar heater according to (6), wherein the third location is an area adjacent to the first location. (8) A planar heater described in any one of (1) to (7), characterized in that when the fixing structure is viewed in cross section in a direction perpendicular to the longitudinal direction of the elongated heater member, there is a portion in which the distance between the center line of the width dimension of the elongated heater member and the edge of the first adhesive member is less than twice the width dimension of the elongated heater member. (9) The sheet heater according to any one of (1) to (8), wherein the elongated heater member is composed of a heater wire and an electric component connected to an end of the heater wire. (10) The plane heater according to (9), wherein the electrical component is a connection terminal. (11) The plane heater according to (9), wherein the electrical component is a thermal fuse.

[0015] Furthermore, configurations in which the configurations described in (1) to (11) above are appropriately selected and combined also fall within the technical scope of the present disclosure. [Brief explanation of the drawings]

[0016] [Figure 1]1 is a schematic diagram of a planar heater of the present invention. [Figure 2] This is the first aspect of the present invention. [Figure 3] 1 is a modified example of the first embodiment of the present invention. [Figure 4] This is the second aspect of the present invention. [Figure 5] 10 is a modification of the second embodiment of the present invention. [Figure 6] 10 is a modification of the second embodiment of the present invention. [Figure 7] 1 is an example of a plane heater using the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The planar heater of the present invention will be described below with reference to the drawings.

[0018] As shown in FIG. 1, a typical structure of the sheet heater 1 of the present invention is such that a heater wire 11 is disposed on a first adhesive member 21 of a predetermined shape, and a first metal foil 31 is attached to the first adhesive member 21.

[0019] The structure of the sheet heater 1 of the present invention is not limited to that shown in Figure 1, and can be modified as appropriate depending on the equipment and application to which the sheet heater 1 is attached. For example, the arrangement pattern of the heater wire 11 can be changed depending on the desired heating performance.

[0020] In FIG. 1, the end of the heater wire 11 is connected to a lead wire 13 via an electric component 12, and when electricity is applied from the lead wire 13, the heater wire 11 generates heat.

[0021] FIG. 2 shows a characteristic part of the present invention.

[0022] As shown in FIG. 2 , the sheet heater 1 of the present invention is a sheet heater in which an elongated heater member 10 having a heater wire 11 that generates heat when energized is disposed on a first adhesive member 21, and a first metal foil 31 is fixed on the first adhesive member 21 so as to cover the elongated heater member 10, At a first location P1 where the elongated heater member 10 is disposed along the edge of the first adhesive member 21, when viewed in cross section on a plane perpendicular to the longitudinal direction of the elongated heater member 10, The second metal foil 32 fixed to the second adhesive member 22 is folded back along the edge of the first metal foil 31, and is fixed to the vicinity of the edge of the first metal foil 31 via the second adhesive member 22, The second metal foil 32 has a fixed structure in which one edge thereof is fixed onto the first adhesive member 21 and the other edge thereof is fixed onto the first metal foil 31.

[0023] The elongated heater member 10 used in the present invention may be configured with only the heater wire 11, or may have an electric component 12 connected to the end of the heater wire 11. The first location P1 may be the location where the heater wire 11 is disposed, or the location where the electric component 12 is disposed. Depending on the specific type of electric component 12, it may not be connected to the heater wire 11, but any electric component 12 used together with the heater wire 11 disposed on the first adhesive member 21 is included in the elongated heater member 10 used in the present invention. Figure 2 shows the case where the location where the electric component 12 connected to the heater wire 11 is disposed is defined as the first location P1.

[0024] At the first location P1 in Figure 2, the electrical component 12, which is part of the elongated heater member 10, is covered with the first metal foil 31, and the second metal foil 32 fixed to the second adhesive member 22 is folded back along the edge of the first metal foil 31, so that one edge of the second metal foil 32 is fixed on the first adhesive member 21 and the other edge is fixed on the first metal foil 31, which is an example of a fixing mode of the first metal foil 31 and the second metal foil 32.

[0025] Hereinafter, unless otherwise specified, the embodiment shown in FIG. 2 will be referred to as the first embodiment of the present invention.

[0026] The first aspect is preferably used when the first location P1 is an area along the edge of the first adhesive member 21, as shown in Figure 2, in other words, when the elongated heater member 10 is arranged along the edge of the first adhesive member 21.

[0027] 2, even if the surface of the elongated heater member 10 is curved, a gap is unlikely to form between the second metal foil 32 and the first adhesive member 21, which makes it difficult for the second metal foil 32 and the first adhesive member 21 to peel off from each other. This is also true for elongated heater members 10 having other shapes.

[0028] In addition, in the first aspect, when the elongated heater member 10 is fixed onto the first adhesive member 21, the metal foil, adhesive member, etc. are not folded onto the back surface of the first adhesive member 21, so the back surface of the first adhesive member 21 can be made flat.

[0029] Therefore, the first aspect can reduce the effect on workability when attaching the sheet heater 1 to a device.

[0030] The edge of the first adhesive member 21 is the starting point for peeling off the planar heater 1 from the equipment, and unevenness on the back surface of the first adhesive member 21 near the edge may promote peeling, but by making the back surface of the edge of the first adhesive member 21 flat, the attachment state of the planar heater 1 to the equipment is stabilized, which helps to prevent peeling.

[0031] The second metal foil 32 and the second adhesive member 22 are cut out separately, but if the first location P1 is provided only on a portion of the edge of the first adhesive member 21, it is only necessary to cut out only the required amount of the second metal foil 32 and the second adhesive member 22, thereby reducing the amount of metal foil and adhesive member used.

[0032] Furthermore, compared to when the first adhesive member 21 is folded over to fix the elongated heater member 10, the outer dimensions of the planar heater 1 can be set with high precision, and the stable outer dimensions make it easier to align the heater when affixing it to the device.

[0033] In the first embodiment, the first metal foil 31 can be used as the main metal foil for constituting the planar heater 1, and at the second location P2, the heater wire 11, which is part of the elongated heater member 10, is arranged on the first adhesive member 21 and is covered with the first metal foil 31 to form the planar heater 1.

[0034] Typically, the second location P2 is an area away from the edge of the first adhesive member.

[0035] 3, the other edge of the second metal foil 32 may be fixed onto the first metal foil 31 so as to cover the elongated heater member 10. FIG. 3 corresponds to the AA cross section of FIG.

[0036] At this time, the position where the other edge of the second metal foil 32 is fixed to the first metal foil 31 is not particularly limited as long as the elongated heater member 10 is covered with the second metal foil 32 .

[0037] By covering the elongated heater member 10 with the second metal foil 32, the fixing strength of the elongated heater member 10 disposed on the edge of the sheet heater 1 can be increased.

[0038] In the present invention, another example of a mode for fixing the first metal foil 31 and the second metal foil 32 is the mode shown in Fig. 4. Hereinafter, unless otherwise specified, the mode shown in Fig. 4 will be referred to as the second mode in the present invention. In the second embodiment, the edge of the first metal foil 31 is folded back and overlapped on the side opposite to the side where the first adhesive member 21 is located, and for convenience, the present invention refers to the edge in this state as the folded edge 31a. In the second embodiment, the second metal foil 32 fixed to the second adhesive member 22 is folded back along the folded edge 31a, so that one edge of the second metal foil 32 is fixed onto the first adhesive member 21 and the other edge is fixed onto the first metal foil 31.

[0039] When the first location P1 is arranged on the edge of the first adhesive member 21, i.e., the edge of the planar heater 1, and the height dimension of the arranged elongated heater member 10 is high, it is not possible to secure a sufficient adhesive margin when folding back and fixing the second metal foil 32 fixed to the second adhesive member 22 along the edge of the first metal foil 31, resulting in problems such as a decrease in the fixing strength of the elongated heater member 10 and a tendency for an air layer to form between the first metal foil 31 and the second metal foil 32, which affects thermal conductivity.

[0040] The second aspect addresses this issue, and by folding back the edge of the first metal foil 31, the amount of adhesion when fixing the second metal foil 32 can be increased, which contributes to improving the fixing strength of the elongated heater member 10 and also suppresses the formation of an air layer.

[0041] As in the first embodiment, in the second embodiment, in order to increase the fixing strength of the elongated heater member 10, the other edge of the second metal foil 32 may be fixed onto the first metal foil 31 so as to cover the elongated heater member 10, as shown in Figure 5.

[0042] In addition, in the second embodiment, the first metal foil 31 can also be used as the main metal foil for constituting the planar heater 1, and the planar heater 1 can also be constructed at the second location P2 by arranging the heater wire 11, which is part of the elongated heater member 10, on the first adhesive member 21 and covering it with the first metal foil 31.

[0043] In either the first or second embodiment, the second metal foil 32 and the second adhesive member 22 may be prepared separately and then used in combination, or the second metal foil 32 and the second adhesive member 22 may be pre-integrated, such as in the case of a metal foil tape.

[0044] The first and second modes may be used appropriately depending on the object to be fixed and the location where the fixing is performed, and may be used in several locations on one sheet heater 1. Furthermore, one sheet heater 1 may be fixed in a combination of the first and second modes, or may be used in combination with conventional fixing methods shown in prior art documents.

[0045] In order to ensure the fixing strength, it is desirable to fix the elongated heater member 10 in the first position P1 to the entire elongated heater member 10, but if the desired fixing strength is obtained, it may be done to only a part of the elongated heater member 10 in the first position P1. Moreover, the elongated heater member 10 in the first position P1 may be fixed in a plurality of positions in the first or second mode.

[0046] As described above, the first location P1 is provided in a region along the edge of the first adhesive member 21, but in the planar heater 1 of the present invention, which aims to improve the fixing strength of the elongated heater member 10, the elongated heater member 10 can be stably fixed even if the distance L between the center line of the width direction dimension of the elongated heater member 10 at the first location P1 and the edge of the first adhesive member 21 is less than twice the horizontal width of the elongated heater member 10. This distance L can be shortened to about 1 / 10 of the width direction dimension of the elongated heater member 10.

[0047] The cross-sectional shape of the elongated heater member 10 is often circular, and when the cross-sectional shape is circular, the diameter thereof is defined as the width dimension.

[0048] The distance L between the center of the contact surface between the elongated heater member 10 and the first adhesive member 21 at the first location P1 and the edge of the first adhesive member 21 can be set to less than twice the width of the elongated heater member 10 in both the first and second embodiments, but as mentioned above, the second embodiment can provide a higher fixing strength than the first embodiment.

[0049] In the sheet heater 1 of the present invention, the elongated heater member 10 may have not only the heater wire 11 but also an electric component 12 at the end of the heater wire 11 . When the electrical component 12 is a thermometer or a thermal fuse (described later) that operates in response to the temperature of the planar heater 1, it may be desirable to place it near the heater wire 11, which is the heat source, to ensure accurate operation.

[0050] When it is desirable to dispose the electric component 12 near the heater wire 11, disposing the heater wire 11 at a third location P3 located between the first location P1 and the second location P2, as shown in Fig. 6, contributes to the stable operation of the electric component 12. Fig. 6 shows the case where the heater wire 11 is disposed at the third location P3 in the second embodiment, but this configuration can also be applied to the first embodiment.

[0051] Typically, the third point P3 is provided in an area farther from the edge of the first adhesive member 21 than the first point P1, so the fixing strength of the elongated heater member 10 arranged at the third point P3 is maintained at a certain level or above. Therefore, at the third location P3, it is not necessarily necessary to further cover the elongated heater member 10 covered with the first metal foil 31 with the second metal foil 32, but from the viewpoint of increasing the fixing strength, the structure shown in Figure 6 in which the elongated heater member 10 is covered with the first metal foil 31 and the second metal foil 32 can be preferably used.

[0052] Furthermore, the third point P3 may be provided in an area close to the first point P1, but depending on the performance and function desired for the planar heater 1, it may also be provided in the center between the first point P1 and the second point P2, or in an area close to the second point P2.

[0053] An example of a planar heater 1 according to the present invention is shown in Fig. 7. The planar heater 1 shown in Fig. 7 has a long heater member 10 fixed at two locations, a first fixing region R1 and a second fixing region R2, according to the second aspect of the present invention, and the cross section AA corresponds to Fig. 6, and the cross section BB corresponds to Fig. 4.

[0054] In the first fixing region R1, there is a heater wire 11 and an electrical component 12a (e.g., a temperature fuse) connected to one end of the heater wire 11 so as to be close to the heater wire 11, and in the second fixing region R2, there is an electrical component 12b (e.g., a connection terminal) connected to the other end of the heater wire 11, and the electrical components 12a and 12b are arranged on an adhesive member (equivalent to the first adhesive member 21) while being covered with a metal foil 300 (equivalent to the first metal foil 31), and a secondary metal foil (equivalent to the second adhesive member 22) fixed to the secondary adhesive member (equivalent to the second metal foil 32) is folded back along the folded edge 31a of the metal foil 300 and fixed near the edge of the metal foil 300 via the secondary adhesive member, with one edge of the secondary metal foil fixed to the adhesive member and the other edge of the secondary metal foil fixed to the metal foil 300.

[0055] The specifications of the heater wire 11 used in the present invention are not particularly limited, and any known heater wire may be appropriately selected and used, such as a heater wire in which a resistance wire is wound around an insulating core material and then coated with an insulator, or a heater wire in which a resistance wire is coated with an insulator.

[0056] When using a heater wire in which a resistance wire is wound around an insulating core material and then covered with an insulator, the insulating core material can be made of a glass core, twisted glass fiber (strands), polyamide fiber, polyester fiber, or a rubber elastic core.

[0057] The material for the resistance wire may be appropriately selected from nichrome wire, copper-nickel wire, iron-chrome wire, etc. The diameter of the resistance wire is appropriately determined depending on the required heat amount, and is preferably about 0.0 to 0.26 mm.

[0058] The insulator may be constructed as a single layer or multiple layers, and the material and construction of the insulator may be selected appropriately depending on the desired performance of the heater wire 11 and the sheet heater 1, etc.

[0059] The insulating material can be selected appropriately from silicone rubber, fluororesin, vinyl chloride resin, etc., and the structure can be extrusion coated or a braided structure consisting of multiple filaments coated with or filled with an insulating material such as silicone varnish or polytetrafluoroethylene.

[0060] Specific examples of electrical components 12 include lead wires for supplying power to the heater wire 11, connection terminals for connecting the heater wire 11 to the lead wires, a temperature fuse that cuts off the power supply to the heater wire 11 by breaking in the event of abnormal heating, thermostats and temperature switches that control the planar heater 1, and thermistors for measuring the temperature of the planar heater 1. Protective tubes and the like that are arranged to cover these electrical components 12 for the purpose of protecting, insulating, etc., of the electrical components 12 are also included in the electrical components 12.

[0061] The electrical component 12 may be connected to the end or middle of the heater wire 11 depending on the desired function of the sheet heater 1, and when connected to the end, it may be connected to only one end or both ends.

[0062] When connecting a plurality of electrical components 12, such as connecting electrical components 12 to both ends of the heater wire 11, different types of electrical components 12 may be combined. For example, one end of the heater wire 11 may be connected to a connection terminal connected to a lead wire, and the other end may be connected to a thermal fuse connected to the lead wire.

[0063] The first adhesive member 21 used in the present invention may be a commercially available double-sided tape sheet with release paper, which may be appropriately selected and punched into the desired shape, but from the viewpoint of ensuring thermal conductivity, it is preferable to use one with a thickness excluding the release paper of 0.2 mm or less. The same applies to the second adhesive member 22.

[0064] The first metal foil 31 and the second metal foil 32 used in the present invention preferably have a thickness of 0.1 mm or less, and may be made of a metal that is commonly used as a heat conductive material, such as aluminum or copper.

[0065] Although the embodiments of the present invention have been described above, the present invention is not limited to the above examples, and various modifications and applications are possible within the scope of the concept of the present invention, and it goes without saying that the present invention may be modified as appropriate. [Industrial Applicability]

[0066] The above example is merely one example of the plane heater of the present invention, and it goes without saying that various modifications and applications are possible within the scope of the concept of the present invention. The plane heater of the present invention is suitable as a lid heater for small home appliances such as rice cookers, but its uses are not limited to these, and the present invention may be applied to other appliances. [Explanation of symbols]

[0067] 1 Planar heater 10 Long heater member 11 Heater wire 12 Electrical Components 13 Lead wire 21 First adhesive member 22 second adhesive member 300 Metallic foil 31 First metal foil 31a Folded edge 32 Second metal foil P1 1st place P2 2nd Place P3 Third Place R1 1st fixed area R2 2nd fixed area

Claims

1. A planar heater comprising: an elongated heater member having a heater wire that generates heat when energized, disposed on a first adhesive member; and a first metal foil fixed on the first adhesive member so as to cover the elongated heater member, When viewed in cross section on a plane perpendicular to the longitudinal direction of the elongated heater member, at least a part of a first location where the elongated heater member is disposed along an edge portion of the first adhesive member, the second metal foil fixed to the second adhesive member is folded back along the edge of the first metal foil, and is fixed to the vicinity of the edge of the first metal foil via the second adhesive member; A plane heater characterized by having a fixed structure in which one edge of the second metal foil is fixed on the first adhesive member and the other edge of the second metal foil is fixed on the first metal foil.

2. 2. The sheet heater according to claim 1, wherein the other edge of the second metal foil is fixed onto the first metal foil so as to cover the elongated heater member.

3. A planar heater as described in claim 2, characterized in that the elongated heater member is arranged on the first adhesive member at the second location, and the elongated heater member is covered with the first metal foil at the second location.

4. A plane heater as described in claim 3, characterized in that the elongated heater member is also arranged on the first adhesive member at a third location located between the first location and the second location and is covered by the first metal foil, and the other edge of the second metal foil is fixed on the first metal foil so as to cover the elongated heater member arranged at the third location.

5. A planar heater comprising: an elongated heater member having a heater wire that generates heat when energized, disposed on a first adhesive member; and a first metal foil fixed on the first adhesive member so as to cover the elongated heater member, When viewed in cross section on a plane perpendicular to the longitudinal direction of the elongated heater member, at least a part of a first location where the elongated heater member is disposed along an edge portion of the first adhesive member, an edge of the first metal foil has a folded edge that is folded back and overlapped on the side opposite to the side where the first adhesive member is located; the second metal foil fixed to the second adhesive member is folded back along the folded edge, and fixed to the vicinity of the folded edge of the first metal foil via the second adhesive member; A plane heater characterized by having a fixed structure in which one edge of the second metal foil is fixed on the first adhesive member and the other edge of the second metal foil is fixed on the first metal foil.

6. 6. The sheet heater according to claim 5, wherein the other edge of the second metal foil is fixed onto the first metal foil so as to cover the elongated heater member.

7. A planar heater as described in claim 6, characterized in that the elongated heater member is arranged on the first adhesive member at the second location, and the elongated heater member is covered with the first metal foil at the second location.

8. The planar heater described in claim 7, characterized in that the elongated heater member is also arranged on the first adhesive member at a third location located between the first location and the second location and is covered by the first metal foil, and the other edge of the second metal foil is fixed on the first metal foil so as to cover the elongated heater member arranged at the third location.

9. A planar heater as described in any one of claims 1 to 8, characterized in that when the fixing structure is viewed in cross section in a direction perpendicular to the longitudinal direction of the elongated heater member, there is a portion in which the distance between the center line of the width dimension of the elongated heater member and the edge of the first adhesive member is less than twice the width dimension of the elongated heater member.

10. 9. The planar heater according to claim 3, wherein the second location is a region away from an edge of the first adhesive member.

11. 9. The planar heater according to claim 4, wherein the third location is a region adjacent to the first location.

12. 9. The sheet heater according to claim 1, wherein the elongated heater member is composed of the heater wire and an electric component connected to an end of the heater wire.

13. 13. The plane heater according to claim 12, wherein the electrical component is a connection terminal.

14. 13. The plane heater according to claim 12, wherein the electrical component is a thermal fuse.

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