Armrest heater

Abstract

To enable energy in an armrest to be saved.SOLUTION: An armrest heater according to one embodiment in the disclosure is installed on an armrest of a seat having a seat back. The armrest heater comprises a seat-shape base material and a heater wire. The base material is arranged in the armrest. The heater wire is wired along a main surface of the base material. The armrest heater has a first region at one end side in a first direction of the armrest and a second region at the other end side in the first direction of the armrest. The heater wire has a heater formation part in which a heater pattern in which a width in a second direction crossing the first direction of the first region is larger than a width in the second direction of the second region is formed.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to an armrest heater. [Background technology]

[0002] Conventionally, armrest heaters mounted on armrests have been disclosed, such as in Patent Document 1. In the conventional armrest heater described in Patent Document 1, the heating wire is arranged in a serpentine pattern in the front-to-rear direction of the seat, and is arranged over the entire area of ​​the nonwoven fabric. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-38321 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional armrest heaters, the heater wire is arranged in the wrist area so that the width of the armrest in the short direction is the same as that of the elbow area, so there is room for improvement in terms of energy conservation.

[0005] One of the objectives of the non-limiting embodiments of the present disclosure is to solve the above problems and enable energy saving in armrests. [Means for solving the problem]

[0006] An armrest heater according to one aspect of the present disclosure is provided in an armrest of a seat having a seat back. The armrest heater includes a sheet-like substrate and a heater wire. The substrate is disposed in the armrest. The heater wire is routed along a main surface of the substrate. The armrest heater has a first region at one end of the armrest in a first direction and a second region at the other end of the armrest in the first direction. The heater wire has a heater forming line portion in which a heater pattern is formed, in which the width of the first region in a second direction intersecting the first direction is greater than the width of the second region in the second direction. [Effects of the Invention]

[0007] One embodiment of the present disclosure provides an armrest heater that enables energy conservation. Further advantages and effects of one embodiment of the present disclosure will become apparent from the specification and drawings. Note that, although advantages and / or effects of one embodiment of the present disclosure are provided by some of the embodiments and features described in the specification and drawings, not all of them necessarily need to be provided to achieve one or more of the same features. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of an exemplary vehicle seat to which an armrest heater according to an embodiment of the present disclosure is applied. [Figure 2] FIG. 2 is a perspective view of an exemplary vehicle seat to which an armrest heater according to an embodiment of the present disclosure is applied. [Figure 3] FIG. 3 is a schematic cross-sectional view showing a cross section of the armrest taken along line DD in FIG. [Figure 4] FIG. 4 is a block diagram showing an outline of a heater device including an armrest heater according to an embodiment of the present disclosure. [Figure 5] FIG. 5 is a schematic diagram of an armrest heater as a comparative example. [Figure 6] FIG. 6 is a schematic diagram of an armrest heater according to an embodiment of the present disclosure. [Figure 7] FIG. 7 is a schematic diagram of an armrest heater in which the main line extends in the X-axis direction according to an embodiment of the present disclosure. [Figure 8] FIG. 8 is a schematic cross-sectional view of the armrest when an occupant rests their arms on the armrest. [Figure 9] FIG. 9 is a schematic diagram of an armrest heater according to a first modified example of the embodiment of the present disclosure. [Figure 10] FIG. 10 is a schematic diagram of an armrest heater in which the folded-back portion of the heater wire is laid out in a straight line in the human body area according to a first modified example of the embodiment of the present disclosure. [Figure 11] FIG. 11 is a schematic diagram of an armrest heater 1 having a fourth region according to a second modified example of the embodiment of the present disclosure. [Figure 12] FIG. 12 is a schematic diagram of an armrest heater according to a third modified example of the embodiment of the present disclosure, in which the wiring intervals of the main wire portions are different. [Figure 13] FIG. 13 is a schematic cross-sectional view of an armrest in which an armrest heater is disposed on the back surface of a cushion layer. [Figure 14] FIG. 14 is a schematic cross-sectional view of an armrest in which an armrest heater is disposed on the rear surface of a cushion layer on which an occupant places their arm. [Figure 15] FIG. 15 is a schematic diagram of an armrest heater in which the first modified example of the embodiment of the present disclosure is combined with the second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functions are designated by the same reference numerals, and redundant description will be omitted. However, in the description of each drawing, only the main components are designated by reference numerals, and components having the same or substantially the same functions as those described in the previous drawings may not be designated by reference numerals. The following embodiments are merely examples for explaining the present disclosure and are not intended to limit the present disclosure. For example, the shapes, structures, materials, components, relative positional relationships, connection states, numerical values, mathematical formulas, the content of each step in a method, and the order of each step shown in the following embodiments are merely examples and may include content not described below. Furthermore, while geometric expressions such as parallel and orthogonal may be used, these expressions do not imply mathematical rigor and include substantially permissible errors, deviations, etc. Furthermore, expressions such as simultaneous and identical also include substantially permissible ranges.

[0010] (Embodiment) An armrest heater 1 according to the present disclosure is applied to, for example, an armrest A provided in a seat of a vehicle such as an automobile. FIG. 1 is a side view of an exemplary vehicle seat to which the armrest heater 1 according to the embodiment is applied. FIG. 2 is a perspective view of an exemplary vehicle seat to which the armrest heater 1 according to the embodiment is applied. The vehicle seat includes an armrest A on which a seated occupant places their arms to support the occupant's arms, a seatback B that supports the occupant's upper body and is used as a backrest, and a seat cushion C on which the occupant sits. FIG. 3 is a schematic cross-sectional view showing a cross section of the armrest A. FIG. 3 is a schematic cross-sectional view of the armrest A taken along line DD in FIG. 2. The Y axis in FIG. 3 is the height direction of the vehicle, with the positive side of the Y axis representing the front side of each stacked member and the negative side of the Y axis representing the back side. The Z axis is the width direction of the vehicle, with the direction from the left armrest toward the center of the seatback B in FIG. 2 representing the positive Z axis and the opposite side representing the negative Z axis. 2 is the traveling direction of the vehicle, with the seatback B side being the positive side of the X-axis and the opposite side being the negative side of the X-axis. That is, the short-side direction of armrest A when used by a seated occupant is the Z-axis direction, and the longitudinal direction of armrest A is the X-axis direction. Note that the first direction in the claims corresponds to the X-axis direction or the longitudinal direction of armrest A, and the second direction corresponds to the Z-axis direction or the short-side direction of armrest A. Note that the X, Y, and Z axes apply similarly in all subsequent figures. The armrest A illustrated in FIG. 3 includes a surface layer 2, an armrest heater 1 (heater mat), a cushion layer 3, and a core material 4.

[0011] The skin layer 2 is the outermost layer of the armrest A, and is provided to cover the armrest heater 1, cushion layer 3, and core material 4. The surface (main surface) of the skin layer 2 is the surface on which the arms of an occupant seated in a seat of a vehicle bear weight. The skin layer 2 can also add design features to the armrest A. Possible materials for the skin layer 2 include synthetic leather made from synthetic resin materials such as polyurethane and polyvinyl chloride, fabric, and natural leather materials such as cowhide or sheepskin.

[0012] The cushion layer 3 is provided on the surface side of the core material 4. The cushion layer 3 may be made of a foam such as urethane.

[0013] The core material 4 is made of a hard resin material and is formed to have a substantially uniform thickness throughout.

[0014] In this embodiment, the armrest heater 1 is disposed on the front surface side of the cushion layer 3, on the rear surface side of the skin layer 2. More specifically, the armrest heater 1 of this embodiment is disposed directly below the skin layer 2. The location where the armrest heater 1 is stacked will be described in detail later.

[0015] The armrest heater 1 comprises a sheet-like substrate 100 and a heater wire 200 woven into the substrate 100 and connected to a control unit 400 that controls the heat generation of the heater. Fig. 4 is a block diagram showing an outline of a heater device including the armrest heater 1 according to the embodiment. The control unit 400 controls the supply and stop of power from a power source 500 to the armrest heater 1.

[0016] Fig. 5 is a schematic diagram of a comparative example of an armrest heater 999. It is assumed that the armrest heater 999 in Fig. 5 is installed in a vehicle seat, and that the armrest is in use in a position substantially parallel to the seat cushion C.

[0017] The detailed configuration of the armrest heater 1 according to the embodiment of the present disclosure will be described. Fig. 6 is a schematic diagram of the armrest heater 1 according to the embodiment of the present disclosure. When the embodiment of the present disclosure is a seat for a vehicle, it is assumed that the armrest A in the armrest heater 1 is in a use state in which the seat cushion C and the surface layer 2 are substantially parallel to each other, as shown in Figs. 1 and 2.

[0018] The substrate 100 has a heater terminal 300 , and a heater wire 200 electrically connected to a control unit 400 via the heater terminal 300 is disposed on the substrate 100 .

[0019] The heater wire 200 has a heater forming wire portion 210 woven into the base material 100 to form a heater pattern in a desired shape in a portion to be heated on the armrest A. The heater wire 200 also has a heater connecting wire portion 220 that is electrically connected to a control unit 400 on the armrest A that controls the heat generation of the heater wire 200. The heater forming wire portion 210 also includes a heater connecting end portion 230 that connects the heater terminal 300 that is closest to the positive side in the Z axis direction, of the two heater terminals 300, to the heater forming wire portion 210. One end of the heater connecting wire portion 220 is electrically connected to the control unit 400, and the other end is electrically connected to the control unit 400 via the heater forming wire portion 210. More specifically, one end of the heater connection line portion 220 is electrically connected to the control unit 400, and the other end is electrically connected to the control unit 400 via the heater pattern formed on the heater forming line portion 210 and the heater connection end portion 230.

[0020] The heater forming wire portion 210 has a main wire portion 211 extending in the Z-axis direction of the armrest and a folded portion 212 extending in the X-axis direction of the armrest. As shown in Fig. 6, the heater wire 200 connected to one of the heater terminals 300 on the positive side of the Z-axis forms the main wire portion 211 toward the positive side of the Z-axis, and when it reaches the end of the substrate 100, it extends in the negative direction of the X-axis to form the folded portion 212. It then extends toward the negative side of the Z-axis to form the main wire portion 211. By repeating this process, the heater wire 200 forms a heater pattern via the heater forming wire portion 210 and is then connected to the heater terminal 300 on the negative side of the Z-axis via the heater connecting wire portion 220.

[0021] The heater wire 200 may be made of a metal material that generates heat when electricity is passed through it, such as a copper alloy, nichrome, or nickel. The heater wire 200 is connected to the control unit 400, and generates heat when electricity is passed through the heater wire 200 from the control unit 400.

[0022] 6, the armrest heater 1 according to the embodiment of the present disclosure has a first region S1 at one end of the armrest heater 1 and a second region S2 at the other end of the armrest heater 1. In other words, the armrest heater 1 has the first region S1 and the second region S2 located on the opposite side of the seat back B from the first region S1. The armrest heater 1 may also have a third region S3 located between the first region S1 and the second region S2. When an occupant places their arm on the armrest A so that the area from their elbow to their wrist is in contact with the armrest A, the region where the elbow is likely to come into contact may be defined as the first region S1, the region where the arm is likely to come into contact may be defined as the third region S3, and the region where the wrist is likely to come into contact may be defined as the second region S2. Furthermore, regardless of the contact of the occupant's arms, the area of ​​the armrest A may be divided into areas in a ratio of 1:3:1, or in a ratio of first area S1:third area S3:second area S2=1:3:1, etc., in relation to the length of each area in the X-axis direction, and each area may be defined as first area S1, third area S3, and second area S2 from the side closest to the seat back B. Furthermore, the ratio of first area S1:third area S3:second area S2=1:1:1, etc., in relation to the length of each area in the X-axis direction may also be used. Note that the armrest heater 1 need only be divided into at least two areas, and may also be divided into four or more areas. In this case, the first area S1, second area S2, and third area S3 do not need to be adjacent to each other, and the ratio may be determined appropriately as long as the first area S1 is on the seat back B side of the first area S1 and the second area S2.

[0023] As shown in Fig. 6, an armrest heater 1 according to an embodiment of the present disclosure includes a sheet-like substrate 100 disposed in an armrest A that supports the arms of an occupant, and a heater wire 200 wired to a heating portion of the substrate 100. The armrest heater 1 also includes a first region S1 closest to a seat back B of the armrest A, and a second region S2 located on the opposite side of the seat back B from the first region S1. The heater wire 200 includes a heater-forming wire portion 210 in which a heater pattern is formed, the width of which in a second direction (Z-axis direction, lateral direction) intersecting a first direction (X-axis direction, longitudinal direction) in the first region S1 is larger than the width of which in the second region S2 is larger in the second direction. That is, the heater wire 200 is disposed such that the width of the heater-forming wire portion 210 in the first region S1 in the lateral direction of the armrest A is larger than the width of the heater-forming wire portion 210 in the lateral direction of the armrest A in the second region S2. The width of the heater forming line portion 210 in the second direction (the width in the short direction of the armrest A) here may refer to the distance in the Z-axis direction between the folded portion 212 and the next folded portion 212 formed, or may be the length of the main line portion 211.

[0024] The heater wire 200 may be arranged such that the length of the main wire portion 211 of the heater wire 200 in the first region S1 is longer than the length of the main wire portion 211 of the heater wire 200 in the second region S2. Here, the length of the main wire portion 211 in the first region S1 refers to the length of the longest main wire portion 211 among at least one main wire portion 211 present in the first region S1. The same applies to the main wire portion 211 in the second region S2 and the main wire portion 211 in the third region S3. For example, if the length of the main wire portion 211 in the first region S1 in the Z-axis direction is 10 cm and the length of the main wire portion 211 in the second region S2 is 5 cm, it can be said that the length of the main wire portion 211 in the first region S1 is longer than the length of the main wire portion 211 in the second region S2. Furthermore, if the length of the main line portion 211 in the first region S1 changes from 10 cm to 9 cm in the negative direction of the X-axis, and the length of the main line portion 211 in the second region S2 changes from 6 cm to 5 cm in the negative direction of the X-axis, then comparing the 10 cm of the main line portion 211 in the first region S1 with the 6 cm in the second region S2, it can be said that the length of the main line portion 211 in the first region S1 is longer than the length of the main line portion 211 in the second region S2.

[0025] Alternatively, the main line portion 211 may extend along the X-axis direction, and the folded-back portion 212 may extend along the Z-axis direction. Fig. 7 is a schematic diagram of an armrest heater 1 according to an embodiment of the present disclosure, in which the main line portion 211 extends along the X-axis direction, and the folded-back portion 212 extends along the Z-axis direction. The width of the heater forming line portion 210 in the short direction of the armrest A here refers to the distance between the main line portion 211 furthest on the positive side of the Z axis and the main line portion 211 furthest on the negative side of the Z axis, among the main line portions 211 arranged in each region.

[0026] 6 and 7, the width in the second direction (short side direction) of the heater forming line portion 210 in the third region S3 is preferably less than the width in the second direction (short side direction) of the heater forming line portion 210 in the first region S1 and greater than the width in the second direction (short side direction) of the heater forming line portion 210 in the second region S2. Also, in FIG. 6, the length of the main line portion 211 in the third region S3 is preferably less than the length of the main line portion 211 in the first region S1 and greater than the length of the main line portion 211 in the second region S2. In other words, the lengths of the main line portions 211 of the meandering heater forming line portion 210 arranged from the first region S1 to the third region S3 and from the third region S3 to the second region S2 are preferably shortened in stages.

[0027] 6 and 7, the heater wire 200 is preferably arranged so that the heater pattern in the heater forming line portion 210 has a tapered trapezoidal shape. More specifically, the heater wire 200 is preferably arranged so that the heater pattern has a trapezoidal shape with a long base in the first region S1 and a short base in the second region S2.

[0028] In the armrest heater 1 according to the embodiment of the present disclosure illustrated in FIG. 6, the heater wire 200 connected to the heater terminal 300 extends in the first region S1 toward the positive side of the Z axis to form a main wire portion 211, and when it reaches the end of the substrate 100 (or the end of the armrest A), it extends in the negative side of the X axis to form a folded portion 212. After forming the folded portion 212 of a predetermined length, it extends in the negative side of the Z axis to form the main wire portion 211. At this time, the main wire portion 211 is arranged so that its length is shorter than that of the main wire portion 211 before being folded. Thereafter, by similarly shortening the main wire portion 211 each time a folded portion 212 is formed, a trapezoidal heater pattern is formed that tapers from the first region S1 toward the second region S2 as shown in FIG. 6.

[0029] Here, one difference between the armrest heater 1 according to the present disclosure and the comparative armrest heater 999 will be described. As shown in FIG. 5 , in the comparative armrest heater 999, the heater wires 200 are arranged so as to fill the surface of the armrest A, with the same width in the Z-axis direction and with equal wiring spacing in the X-axis direction. However, when an occupant actually places their arm on the armrest A, the arm is likely to taper from the elbow to the wrist, and the contact area of ​​the wrist with the armrest A is smaller than the contact area of ​​the arm near the elbow. Therefore, with the wiring shown in FIG. 5 , unnecessary wiring may be provided in the area near the wrist relative to the contact area of ​​the wrist. In contrast, in the embodiment of the present disclosure, as shown in FIG. 6 , the length of the main wire portion 211 gradually decreases from the first region S1 to the second region S2, allowing the heater wire 200 to be routed along the shape of the arm, thereby efficiently warming the occupant's arm and saving energy.

[0030] In this case, as long as the width of the heater forming line portion 210 in the first region S1 is greater than the width of the heater forming line portion 210 in the second region S2, the heater pattern of the heater forming line portion 210 does not have to be trapezoidal. For example, it may be arched or triangular.

[0031] In the embodiment of the present disclosure, the heater wire 200 is arranged such that the wiring spacing H1 of the main wire portions 211 in the first region S1 is equal to the wiring spacing H2 of the main wire portions 211 in the second region S2. Note that, for example, if the wiring spacing H1 is 3 cm, the wiring spacing H2 may be 2.5 cm or 3.5 cm, and may include slight differences due to slight errors that may occur in production or design constraints. More preferably, the wiring spacing H1 of the main wire portions 211 in the first region S1, the wiring spacing H2 of the main wire portions 211 in the second region S2, and the wiring spacing H3 of the main wire portions 211 in the third region S3 are arranged equal to each other. In addition, when there is only one main line portion 211 in the first region S1, the wiring spacing between the main line portion 211 arranged in the first region S1 and the main line portion 211 in another region adjacent to the main line portion 211 arranged in the first region S1 is referred to as the wiring spacing H1 of the main line portion 211 in the first region S1. In the embodiment of the present disclosure shown in FIG. 6, the folded portion 212 is straight and arranged parallel to the longitudinal direction of the armrest A, but the shape of the folded portion 212 may be straight, curved, or V-shaped. Similarly, the shape of the main line portion 211 may also be straight or curved. By arranging the wiring spacing of the main line portions 211 equally in the first region S1, the second region S2, and the third region S3, the amount of heat generated by the heater forming line portion 210 in the X-axis direction of the heat generating region is constant, enabling uniform heating. Therefore, the passenger can feel the same degree of warmth in the armrest A heated by the armrest heater 1, for example, in the elbow area and the wrist area.

[0032] 3, in an armrest A having a skin layer 2 and a cushion layer 3, the armrest heater 1 is disposed on the back side of the skin layer 2 that covers the surface of the armrest A. More specifically, the armrest heater 1 in the embodiment of the present disclosure is disposed on the back side of the skin layer 2 without the cushion layer 3 in between. More preferably, the armrest heater 1 is disposed directly below the skin layer 2. By disposing the armrest heater 1 on the back side of the skin layer 2, the armrest heater 1 can directly heat the skin layer 2, resulting in excellent quick-heating properties.

[0033] FIG. 8 is a schematic cross-sectional view of the armrest A when an occupant places their arm on it. As shown in FIG. 8, when the armrest heater 1 is disposed directly under the skin layer 2 without the cushion layer 3, the distance between the occupant's arm and the armrest heater 1 remains substantially constant when the occupant places their arm on the armrest A. Therefore, the heater wire 200 is arranged so that the wiring spacing H1 of the main wire portions 211 in the first region S1 and the wiring spacing H3 of the main wire portions 211 in the third region S3 are substantially equal. This ensures that the amount of heat generated in the X-axis direction of the heater-forming wire portion 210 relative to the arm contact surface remains substantially constant, allowing the occupant to feel a uniform temperature in each part of the body, such as the wrist, forearm, and elbow. The same effect can be achieved not only in the armrest A shown in FIG. 3 but also in armrests A whose skin layer is made of a hard material or a wooden board, since the distance between the occupant's arm and the armrest heater 1 remains substantially constant.

[0034] As described above, the heater wire 200 has a heater forming wire portion 210 and a heater connecting wire portion 220. The heater connecting wire portion 220, which connects the heater forming wire portion 210 after the heater pattern is formed to the heater terminal 300, refers to the heater wire 200 that connects the heater terminal 300 to the main wire portion 211 that is located furthest to the negative X-axis side of the heater forming wire portion 210. Alternatively, the heater connecting wire portion 220 refers to the heater wire 200 that connects the heater terminal 300 to the heater forming wire portion 210 that has at least one main wire portion 211 extending from the heater terminal 300. As shown in FIG. 6 , the heater connecting wire portion 220 is located closer to the center of the seat back B than the heater forming wire portion 210, i.e., on the opposite side from the occupant side (the negative Z-axis direction). Alternatively, when the passenger side of a line segment R that bisects one short side of the armrest A is defined as a human body region M2 and the door side is defined as a door region M1, the heater connection wire portion 220 is preferably disposed in the door region M1. Explaining this with reference to FIG. 6, when the region on the negative side of the line segment R on the Z axis is defined as the door region M1 and the region on the positive side of the line segment R on the Z axis is defined as the human body region M2, the heater connection wire portion 220 is disposed in the door region M1. The line segment R is a line segment along the longitudinal direction that bisects the area of ​​the armrest A. This is because, for example, when the armrest heater 1 is mounted in the armrest A of a seat of a vehicle, the temperature of the armrest A may drop in the door region M1 due to the effects of heat radiation (cold radiation) to the outside air and heat conduction to the outer panel surface cooled by the outside air. Therefore, by arranging the heater connection line portion 220 in the door region M1 and utilizing the heat of the heater connection line portion 220, it is possible to suppress the effects of cold radiation and the like in the door region M1. In this embodiment, the heater connection line portion 220 is a straight line that does not form a pattern, but there is no intention to limit the shape in particular.

[0035] (First Modification) The first variant differs from the embodiment in that when the armrest A is in use by an occupant seated in the seat, the heater forming wire portion 210 is wired offset toward the center of the seat back B, i.e., toward the occupant.

[0036] 9 is a schematic diagram of an armrest heater 1 according to a first modified example of the embodiment of the present disclosure, in which the heater wire 200 is offset toward the center of the seat back B. Here, "offset" refers to a state in which the center point of the main wire portion 211 arranged in the third region S3 is positioned closer to the center of the seat back B than the center point of the main wire portion 211 arranged in the first region S1.

[0037] Here, the armrest heater 1 defines the surface of the armrest A on which the occupant places their arm as the front surface, and defines the human body region M2 on the center side of the seat back B relative to a line segment R along the longitudinal direction that bisects the surface area as the door region M1 on the opposite side. In this case, for example, of the two ends (both ends) of the main line portion 211 of the second region S2, a state in which the distance between the end of the main line portion 211 on the door side and the side of the armrest A closest to the human body is shorter than the distance between the end of the main line portion 211 on the door side and the side of the armrest A closest to the door side may be defined as being offset toward the center of the seat back B.

[0038] Alternatively, the heater wire 200 may be offset toward the center of the seat back B when the wiring area of ​​the heater-forming wire portion 210 in the human body region M2 is larger than the wiring area of ​​the heater-forming wire portion 210 in the door region M1. The wiring area here refers to the area of ​​a virtual figure created by connecting the vicinity of adjacent corners of the folded-back portion 212 in the longitudinal direction of the heater-forming wire portion 210 with a virtual line segment, as shown by the dashed line in FIG. 9 . "Offset" means, in other words, that the point dividing each main line portion 211 into two equal parts is located in the human body region M2. Alternatively, the proportion of the length of the main line portion 211 located in the human body region M2 increases from the first region S1 to the second region S2.

[0039] When an occupant places their arm on armrest A with the back of their hand facing the ceiling of the vehicle, it is likely that the side of their arm opposite their body will curve from their elbow to their wrist toward the center of their body. In this case, as described above, in the armrest heater 1 of this modified example, the heater wire 200 is closer to the body, so that it can more accurately adapt to the shape of the occupant's arm and therefore warm the occupant's arm more efficiently.

[0040] It is also possible to arrange the folded portions 212 on the same straight line. Fig. 10 is a schematic diagram of an armrest heater 1 in which the folded portions 212 of the heater wire 200 are arranged on a straight line in the human body region M2 according to a first modified example of the embodiment. As shown in Fig. 10, in the human body region M2, the folded portions 212 arranged in the first region S1, the folded portions 212 arranged in the second region S2, and the folded portions 212 arranged in the third region S3 are arranged on the same straight line parallel to the X-axis, and the heater forming line portion 210 is formed so as to be closer to the human body. As a result, compared to the configuration of Fig. 9, the folded portions 212 are closer to the human body, and the occupant's arms can be warmed more efficiently. As shown in Figures 9 and 10, the shape of the heater pattern of the heater forming line portion 210 is not important as long as there is more wiring of the heater forming line portion 210 on the human body side and the length of the main line portion 211 in the second region S2 is shorter than the length of the main line portion 211 in the first region S1.

[0041] (Second Modification) In the second modified example, the armrest heater 1 differs from the embodiment in that it has a fourth region S4 on the opposite side to the seat back B side from the second region S2.

[0042] 11 is a schematic diagram of an armrest heater 1 having a fourth region S4 according to a second modified example of the embodiment of the present disclosure. As described above, the armrest heater 1 has the fourth region S4 on the negative side of the X-axis relative to the second region S2. The fourth region S4 is often the region that is thought to come into contact with the palm of an occupant when the occupant places their arm on the armrest A.

[0043] The wiring density in the fourth region S4 is higher than the wiring density in the first region S1, the wiring density in the second region S2, and the wiring density in the third region S3. Here, wiring density refers to the amount of wiring per unit area of ​​the region. In other words, the spacing between the multiple folded portions 212 formed in the fourth region S4 is shorter than the spacing between the folded portions 212 formed in the first region S1, the second region S2, and the third region S3. This reduces the wiring spacing between the main line portions 211, increasing the wiring density in the fourth region S4, resulting in a greater amount of heat generated per unit area in the fourth region S4 than in the first region S1, the second region S2, and the third region S3.

[0044] The fourth region S4 is often touched by the palms of passengers, and the palms are extremities of the human body that tend to get cold easily. Therefore, in the armrest heater 1 of this modified example, the wiring density in the fourth region S4 is made higher than the wiring density in the first region S1, the second region S2, and the third region S3, so that the palms, which tend to get cold easily, can feel the same temperature as other parts of the arms. Furthermore, by providing the fourth region S4 and making the heater pattern from the first region S1 to the second region S2 a trapezoidal shape as shown in FIG. 11, it is possible to efficiently warm the arms while saving energy.

[0045] (Third Modification) In the third modified example, the heater wire 200 is different from the embodiment in that the wiring spacing H1 of the main wire portions 211 in the first region S1 is larger than the wiring spacing H2 of the main wire portions 211 in the second region S2.

[0046] FIG. 12 is a schematic diagram of an armrest heater 1 according to a third modified example of the embodiment of the present disclosure, in which the wiring spacing of the main wire portions 211 is different. As shown in FIG. 12, the wiring spacing H1 of the main wire portions 211 in the first region S1 is greater than the wiring spacing H2 of the main wire portions 211 in the second region S2. In other words, the wiring density in the first region S1 is sparse, and the wiring density in the second region S2 is dense. Note that the wiring spacing H1 of the main wire portions 211 in the first region S1 here refers to the spacing between two main wire portions 211, at least one of which is arranged in the first region S1. Furthermore, if there are two or more wiring spacings H1 between the main wire portions 211 in the first region S1, this refers to the largest wiring spacing. In this case, the shape of the folded portion 212 may be straight, curved, or V-shaped, and is not limited to this shape. Since the wrists are closer to the extremities of the human body and tend to get colder than the elbows, the heat generation rate of the wrists is made greater than that of the elbows, allowing the arms of the passenger to be warmed efficiently in accordance with how easily they get cold. This suppresses heat generation in areas other than the wrists and warms the wrists, which tend to get colder, further improving the efficiency of the armrest heater 1.

[0047] In this case, the armrest heater 1 may be disposed on the back surface of the cushion layer 3 of the armrest A. FIG. 13 is a schematic cross-sectional view of an armrest A in which the armrest heater 1 is disposed on the back surface of the cushion layer 3. As shown in FIG. 13, the armrest A includes a skin layer 2, a cushion layer 3, and an armrest heater 1. The armrest heater 1 is disposed on the back surface of the cushion layer 3, which is newly disposed in the configuration of FIG. 3. In other words, the armrest heater 1 is disposed between two cushion layers 3. By disposing the armrest heater 1 on the back surface of the cushion layer 3, the heater wire 200 is less likely to be damaged even with long-term use. FIG. 14 is a schematic cross-sectional view of the armrest A in which the armrest heater 1 is disposed on the back surface of the cushion layer 3 when an occupant places their arm on it. As shown in FIG. 14, when the armrest heater 1 is disposed on the back surface of the cushion layer 3 and an occupant places their arm on the armrest A, the cushion layer 3 is disposed between the arm and the armrest heater 1, so that the distance between each part of the arm and the armrest heater 1 changes depending on the weight of the arm. More specifically, when an occupant places their arm on armrest A, the elbow is more likely to bear weight than the wrist, and is therefore closer to the armrest heater 1. In this case, as shown in Fig. 12, the armrest heater 1 is configured so that the wiring spacing H1 of the main wire portions 211 in the first region S1 is larger than the wiring spacing H2 of the main wire portions 211 in the second region S2. In other words, by making the wiring dense in the second region S2 where the wrist is likely to be placed and making the wiring sparse in the first region S1 where the elbow is likely to be placed, and creating a difference in the amount of heat generated in the X-axis direction, the temperature difference felt by the occupant's elbow and wrist can be reduced.

[0048] (Configuration and Effects of the Embodiment) The configuration and effects of the embodiments of the present disclosure will be described below.

[0049] The armrest heater 1 of the embodiment comprises a sheet-like substrate 100 placed on the armrest A and a heater wire 200 wired along the main surface of the substrate 100, and the armrest heater 1 has a first region S1 at one end of the armrest heater 1 in a first direction and a second region S2 at the other end of the armrest heater 1 in the first direction, and the heater wire 200 has a heater forming wire portion 210 that forms a heater pattern in which the width of the heater forming wire portion 210 in the first region S1 in a second direction that intersects with the first direction of the armrest A is greater than the width of the heater forming wire portion 210 in the second region S2 in the second direction of the armrest A.

[0050] According to the above configuration, the heater wire 200 is arranged so that the width of the heater forming wire portion 210 in the first region S1 in the second direction of the armrest A is larger than the width of the heater forming wire portion 210 in the second region S2 in the second direction of the armrest A. That is, the wiring is arranged so that the wiring area is larger in the area where the elbow of the arm is likely to be placed, which has a large contact area, and the wiring area is smaller in the area where the wrist is likely to be placed, which has a small contact area. This reduces the use of excess heater wire 200 and enables cost reduction. Furthermore, by suppressing the amount of heat generated in the wrist area, energy used to heat unnecessary areas can be saved, thereby enabling energy conservation.

[0051] In addition, in the armrest heater 1, when the armrest heater 1 is in use by an occupant seated in the seat, the second region S2 may be located on the opposite side of the seat back B from the first region S1.

[0052] According to the above configuration, the heater wire 200 is arranged so that the width of the heater forming wire portion 210 in the first region S1 in the second direction of the armrest A is larger than the width of the heater forming wire portion 210 in the second region S2 in the second direction of the armrest A. That is, the wiring is arranged so that the wiring area is larger in the area where the elbow of the arm, which has a large contact area, is likely to be placed, and the wiring area is smaller in the area where the wrist, which has a small contact area, is likely to be placed. This reduces the use of excess heater wire 200 and enables cost reduction. Furthermore, by suppressing the amount of heat generated in the wrist area, energy used to heat unnecessary areas can be saved, similarly enabling energy conservation.

[0053] In the armrest heater 1, the heater forming line 210 may form a heating region that tapers from one end to the other end.

[0054] According to the above configuration, the heater wire 200 is arranged to more closely follow the shape of the arm, so that the arm of the occupant can be warmed more efficiently, thereby enabling energy saving.

[0055] In addition, in the armrest heater 1, the heater forming line portion 210 has a main line portion 211 extending in the second direction of the armrest A, and the length of the main line portion 211 in the second region S2 may be shorter than the length of the main line portion 211 in the first region S1.

[0056] According to the above configuration, the heater wire 200 is arranged so that the main wire portion 211 extending in the short direction of the armrest A in the second region S2 is shorter than the main wire portion 211 extending in the short direction of the armrest A in the first region S1. That is, the wiring is arranged so that the wiring area is large in the area where the elbow of the arm, which has a large contact area, is likely to be placed, and the wiring area is small in the area where the wrist, which has a small contact area, is likely to be placed. This reduces the use of excess heater wire 200 and enables cost reduction. Furthermore, by suppressing the amount of heat generated in the wrist region, energy used to heat unnecessary parts can be saved, similarly enabling energy conservation.

[0057] In addition, the armrest heater 1 may have a third region S3 arranged between the first region S1 and the second region S2, and the heater pattern formed in the heater forming line portion 210 may be arranged so that the width in the second direction in the third region S3 is less than the width in the second direction in the first region S1 and greater than the width in the second direction in the second region S2.

[0058] According to the above configuration, the width of the heater wire 200 along the second direction of the armrest A gradually decreases from the first region S1 to the second region S2, and from the second region S2 to the third region S3, so that the shape is more in line with the arms and can efficiently warm the occupant's arms, thereby enabling energy savings.

[0059] The armrest heater 1 further has a fourth region S4 arranged on the opposite side of the first region S1 in the first direction via the second region S2, and the heater wire 200 is arranged so that the wiring density in the fourth region S4 is higher than the wiring density in the first region S1 and the second region S2.

[0060] With the above configuration, unnecessary heating of the area from the elbow to the wrist is suppressed, thereby saving energy, while the fourth area S4, which warms the palm, an extremity of the human body that is prone to getting cold, has a high wiring density, so it can efficiently warm the area from the arm to the palm, providing comfort to the occupant.

[0061] In the armrest heater 1, the heater forming line portion 210 in the second region S2 may be offset toward the center of the seat back B.

[0062] According to the above configuration, the heater forming wire portion 210 of the heater wire 200 is offset toward the center of the seat back B. In other words, the heater wire 200 is closer to the human body. Therefore, when the occupant places their arm with the back of their hand facing the ceiling of the vehicle, the side of the arm opposite the human body curves toward the center of the body from the elbow to the wrist, following the shape of the human arm. This makes it possible to warm the occupant's arm more efficiently.

[0063] In addition, in the armrest heater 1, the heater wire 200 further has a heater connection wire portion 220 electrically connected to a control unit 400 that controls the heat generation of the heater wire 200, one end of the heater connection wire portion 220 is electrically connected to the control unit 400, and the other end is electrically connected to the control unit 400 via a heater pattern formed in the heater forming wire portion 210, and when the armrest A is in use by an occupant seated in the seat, the heater connection wire portion 220 may be arranged on the opposite side of the center of the seat back B in the second direction from the heater forming wire portion 210.

[0064] According to the above configuration, the heater connection wire portion 220 is disposed on the opposite side of the center of the seat back B from the heater forming wire portion 210, i.e., the heater connection wire portion 220 is disposed closer to the door side, thereby suppressing the effects of cold radiation and the like on the door side. This prevents an occupant from feeling uncomfortable when placing their hand on the door-side armrest A because the door side of the armrest A is cold due to cold radiation and the like. In particular, if the wiring area of ​​the heater forming wire portion 210 in the human body region M2 of the heater wire 200 is larger than the wiring area of ​​the heater forming wire portion 210 in the door region M1, the door side generates less heat than the occupant side and is more likely to become colder due to cold radiation. Therefore, disposing the heater connection wire portion 220 in the door region M1 makes it possible to warm the door-side armrest A.

[0065] In addition, in the armrest heater 1, the heater wire 200 has a main line portion 211 extending in the second direction of the armrest A, and is arranged so that the wiring spacing H1 of the main line portion 211 in the first region S1 and the wiring spacing H2 of the main line portion 211 in the second region S2 are equal.

[0066] With the above configuration, the armrest heater 1 has the same wiring spacing H1 of the main wire portions 211 in the first region S1 and the same wiring spacing H2 of the main wire portions 211 in the second region S2, so the amount of heat generated in the X-axis direction of the heat generating region by the heater forming wire portions 210 is constant, enabling uniform heating. As a result, the occupant can feel the same degree of warmth in the armrest A heated by the armrest heater 1, for example, in the elbow and wrist areas.

[0067] In addition, in the armrest heater 1, the heater wire 200 has a main line portion 211 extending in the second direction of the armrest A, and may be arranged so that the wiring spacing H1 of the main line portion 211 in the first region S1 is larger than the wiring spacing H2 of the main line portion 211 in the second region S2.

[0068] According to the above configuration, the armrest heater 1 has a wide wiring spacing H1 in the first region S1 and a narrow wiring spacing H2 in the second region S2, so the amount of heat generated in the X-axis direction in the first region S1 is small and the amount of heat generated in the X-axis direction in the second region S2 is large. Because the wrists are closer to the extremities of the human body and tend to get colder than the elbows, the heat generated in the wrists is large and the heat generated in the elbows is small, so the arms of the occupant can be warmed efficiently according to their susceptibility to getting cold. This suppresses heat generation in areas where the wrists are not located and warms the wrists, which tend to get colder, further improving the efficiency of the armrest heater 1.

[0069] The armrest A may be provided with a surface layer 2 that covers the surface side of the armrest A on which the load of the occupant's arm is applied, and the armrest heater 1 may be disposed on the back side of the surface layer 2.

[0070] According to the above configuration, the armrest heater 1 is disposed on the back side of the skin layer 2, so that it can directly heat the skin layer 2 of the armrest A, thereby achieving fast heating. In particular, when it is disposed directly under the skin layer 2, it can achieve even faster heating. Furthermore, because the armrest heater 1 is located directly under the skin layer 2, the distance between the armrest heater 1 and the arm does not change even when the weight of the occupant's arm affects the armrest heater 1 when the occupant places their arm on the armrest heater 1. Therefore, when the wiring spacing H1 of the main wires 211 in the first region S1 and the wiring spacing H2 of the main wires 211 in the second region S2 are equal in the armrest heater 1, the skin layer 2 of the armrest A can be heated uniformly, so that the occupant's arm can be heated at a uniform temperature.

[0071] In addition, in the armrest A, which is provided with a skin layer 2 that covers the surface side of the armrest A on which the load is applied by the occupant's arm, and a cushion layer 3 that is arranged on the back side of the skin layer 2, the armrest heater 1 is arranged so as to face the skin layer 2 via the cushion layer 3.

[0072] With the above configuration, the armrest heater 1 is disposed below the cushion layer 3, making the heater wire 200 less susceptible to damage even with long-term use. Furthermore, the presence of the cushion layer 3 means that when an occupant places their arm on the armrest heater 1, the elbow is closer to the armrest heater 1 than the wrist. In this case, the wiring spacing H1 of the main wire portions 211 in the first region S1 of the armrest heater 1 is larger than the wiring spacing H2 of the main wire portions 211 in the second region S2. In other words, by making the wiring dense in the second region S2 and sparse in the first region, a difference in the amount of heat generated in the X-axis direction is created, thereby reducing the temperature difference felt by the occupant's elbow and wrist.

[0073] Although several embodiments of the present disclosure have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit and scope of the invention. For example, the first modified example may be combined with the second modified example. FIG. 15 is a schematic diagram of an armrest heater that combines the first modified example of the embodiment of the present disclosure with the second modified example. As shown in FIG. 15, the armrest heater 1 has a fourth region S4 on the opposite side of the seat back B from the second region S2 (the left side in FIG. 15, the negative X-axis direction), and the wiring area of ​​the heater-forming wire portion 210 in the human body region M2 is arranged to be larger than the wiring area of ​​the heater-forming wire portion 210 in the door region M1. As a result, the heater wire 200 is closer to the human body, allowing it to more accurately conform to the shape of the occupant's arm, thereby more efficiently warming the occupant's arm. Furthermore, by making the wiring density in the fourth region S4 higher than the wiring density in the first region S1, the second region S2, and the third region S3, the palm, which is prone to getting cold, can be made to feel the same temperature as other parts of the arm. Furthermore, by providing the fourth region S4 and making the heater pattern trapezoidal from the first region to the second region as shown in FIG. 15, it is possible to efficiently warm the arm while saving energy. These embodiments and their modifications are within the scope and spirit of the invention, as well as the scope of the claims and their equivalents. (Addendum)

[0074] The above description of the embodiments discloses the following techniques. (1) An armrest heater provided in an armrest of a seat having a seat back, A sheet-like substrate to be placed on the armrest; a heater wire wired along the main surface of the base material, the armrest heater has a first region at one end side of the armrest in a first direction and a second region at the other end side of the armrest in the first direction, the heater wire has a heater forming line portion in which a heater pattern is formed, the width of the first region in a second direction intersecting the first direction being larger than the width of the second region in the second direction; Armrest heater. (2) When the armrest is in a state where it is being used by an occupant seated in the seat, The second region of the armrest heater is provided on the opposite side of the seat back from the first region in the first direction. The armrest heater according to (1) above. (3) the heater forming line portion forms a heating region tapered from the one end side to the other end side in the first direction, The armrest heater according to (1) or (2) above. (4) the heater pattern formed on the heater forming line portion has a main line portion extending in the second direction of the armrest, The length of the main line portion in the second region is shorter than the length of the main line portion in the first region. The armrest heater according to any one of (1) to (3) above. (5) the armrest heater further includes a third region disposed between the first region and the second region in the first direction, The heater pattern formed on the heater forming line portion has a width in the second direction of the third region that is less than a width in the second direction of the first region and greater than a width in the second direction of the second region. The armrest heater according to any one of (1) to (4) above. (6) the armrest heater has a third region disposed between the first region and the second region in the first direction, The heater pattern formed on the heater forming line portion has a length of the main line portion in the third region that is shorter than a length of the main line portion in the first region and longer than a length of the main line portion in the second region. The armrest heater according to any one of (1) to (5) above. (7) the armrest heater further includes a fourth region disposed on the opposite side of the first region with the second region interposed therebetween in the first direction, the heater pattern formed in the heater forming line portion has a wiring density in the fourth region that is higher than the wiring densities in the first region and the second region; The armrest heater according to any one of (1) to (6) above. (8) The heater forming wire portion in the second region is offset toward the center of the seat back. The armrest heater according to any one of (1) to (7) above. (9) the heater wire further includes a heater connection wire portion electrically connected to a control unit that controls heat generation of the heater wire, one end of the heater connecting line portion is electrically connected to the control unit, and the other end is electrically connected to the control unit via the heater pattern formed on the heater forming line portion; When the armrest is in use by an occupant seated in the seat, the heater connection line portion is disposed on the opposite side of the center of the seat back from the heater forming line portion in the second direction. The armrest heater according to any one of (1) to (8) above. (10) the heater pattern formed on the heater forming line portion has a main line portion extending in the second direction of the armrest, The wiring interval of the main line portion in the first region is equal to the wiring interval of the main line portion in the second region. The armrest heater according to any one of (1) to (9) above. (11) the heater pattern formed on the heater forming line portion has a main line portion extending in the second direction of the armrest, a wiring interval of the main line portions in the first region is larger than a wiring interval of the main line portions in the second region; The armrest heater according to any one of (1) to (9) above. (12) In the armrest, a skin layer is provided to cover a surface side of the armrest on which a load is applied by an occupant's arm, The armrest heater is disposed on the back side of the skin layer. The armrest heater according to any one of (1) to (11) above. (13) a skin layer covering a surface side of the armrest to which a load is applied by an occupant's arm; a cushion layer disposed on the back surface side of the skin layer, The armrest heater is disposed opposite the surface layer via the cushion layer. The armrest heater according to any one of (1) to (11) above. [Explanation of symbols]

[0075] 1 Armrest heater (heater mat) 2 Epidermal layer 3 Cushion layer 4 Core material 100 Base material 200 heater wire 210 Heater forming line 211 Main line section 212 Folded section 220 Heater connection wire 300 Heater terminal 400 control section 500 power supply A Armrest B. Seat back C. Seat cushion S1 1st area S2 2nd area S3 3rd area S4 4th area R line segment M1 Door Area M2 human body area H1 Wiring spacing H2 Wiring spacing H3 Wiring spacing

Claims

1. An armrest heater provided in an armrest of a seat having a seat back, A sheet-like substrate to be placed on the armrest; a heater wire wired along the main surface of the base material, the armrest heater has a first region at one end side of the armrest in a first direction and a second region at the other end side of the armrest in the first direction, the heater wire has a heater forming line portion in which a heater pattern is formed, the width of the first region in a second direction intersecting the first direction being larger than the width of the second region in the second direction; Armrest heater.

2. When the armrest is in a state where it is being used by an occupant seated in the seat, The second region of the armrest heater is provided on the opposite side of the seat back from the first region in the first direction.

2. The armrest heater according to claim 1.

3. the heater forming line portion forms a heating region tapered from the one end side to the other end side in the first direction; 2. The armrest heater according to claim 1.

4. the heater pattern formed on the heater forming line portion has a main line portion extending in the second direction of the armrest, The length of the main line portion in the second region is shorter than the length of the main line portion in the first region.

2. The armrest heater according to claim 1.

5. the armrest heater further includes a third region disposed between the first region and the second region in the first direction, the heater pattern formed on the heater forming line portion has a width in the second direction of the third region that is less than a width in the second direction of the first region and greater than a width in the second direction of the second region; 2. The armrest heater according to claim 1.

6. the armrest heater has a third region disposed between the first region and the second region in the first direction, the heater pattern formed on the heater forming line portion has a length of the main line portion in the third region that is less than a length of the main line portion in the first region and greater than a length of the main line portion in the second region; 5. The armrest heater according to claim 4.

7. the armrest heater further includes a fourth region disposed on the opposite side of the first region with the second region interposed therebetween in the first direction, the heater pattern formed in the heater forming line portion has a wiring density in the fourth region that is higher than the wiring density in the first region and the second region; 2. The armrest heater according to claim 1.

8. The heater forming line portion in the second region is offset toward the center of the seat back. An armrest heater according to any one of claims 1 to 7.

9. the heater wire further includes a heater connection wire portion electrically connected to a control unit that controls heat generation of the heater wire, one end of the heater connecting line portion is electrically connected to the control unit, and the other end is electrically connected to the control unit via the heater pattern formed on the heater forming line portion, When the armrest is in use by an occupant seated in the seat, the heater connection line portion is disposed on an opposite side of the seat back center side relative to the heater forming line portion in the second direction. An armrest heater according to any one of claims 1 to 7.

10. the heater wire further includes a heater connection wire portion electrically connected to a control unit that controls heat generation of the heater wire, one end of the heater connecting line portion is electrically connected to the control unit, and the other end is electrically connected to the control unit via the heater pattern formed on the heater forming line portion, When the armrest is in use by an occupant seated in the seat, the heater connection line portion is disposed on an opposite side of the seat back center side relative to the heater forming line portion in the second direction.

9. The armrest heater according to claim 8.

11. the heater pattern formed on the heater forming line portion has a main line portion extending in the second direction of the armrest, a wiring interval between the main line portions in the first region and a wiring interval between the main line portions in the second region are equal; An armrest heater according to any one of claims 1 to 7.

12. the heater pattern formed on the heater forming line portion has a main line portion extending in the second direction of the armrest, a wiring interval of the main line portions in the first region is larger than a wiring interval of the main line portions in the second region; An armrest heater according to any one of claims 1 to 7.

13. In the armrest, a skin layer is provided to cover a surface side of the armrest on which a load is applied by an occupant's arm, The armrest heater is disposed on the back side of the skin layer. An armrest heater according to any one of claims 1 to 7.

14. In the armrest, a skin layer is provided to cover a surface side of the armrest on which a load is applied by an occupant's arm, The armrest heater is disposed on the back side of the skin layer.

12. The armrest heater of claim 11.

15. a skin layer covering a surface side of the armrest to which a load is applied by an occupant's arm; a cushion layer disposed on the back surface side of the skin layer, The armrest heater is disposed opposite the surface layer via the cushion layer. An armrest heater according to any one of claims 1 to 7.

16. a skin layer covering a surface side of the armrest to which a load is applied by an occupant's arm; a cushion layer disposed on the back surface side of the skin layer, The armrest heater is disposed opposite the surface layer via the cushion layer.

13. The armrest heater of claim 12.

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