JP2014015145A - Planar heating element and vehicle seat using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planar heating element which uses leather as a base material and warms a surface of the leather more promptly.SOLUTION: In a planar heating element, a through hole 21 is formed in leather 13, and a conductive coating film 31 is formed so as to establish electrical continuity with a rear surface 15 of the leather 13 and the interior of the through hole 21. The planar heating element generates heat by flowing a current through the conductive coating film 31.

Description

  The present invention relates to a sheet heating element and a vehicle seat using the sheet heating element.

  As a skin material of a typical sheet, a fabric such as a woven fabric or a knitted fabric, and leather can be cited. Among these, leather is particularly easy to feel cold in a cold environment because of its touch. Paying attention to this point, Patent Document 1 proposes a planar heating element that generates heat by directly applying a conductive paint to the back surface of leather and energizing the coating film. If such a leather-based planar heating element is placed on the seating surface of the seat and the seat heater is configured, heat is generated at a position relatively close to the seated person, so heat is transferred to the seated person to a certain degree of speed. can do.

JP 2004-95498 A

  However, since the conductive film, which is the heat source, is formed only on the back of the leather, heat is transferred to the seated person through the thickness of the leather, so heat is transferred to the seated person by the thickness of the leather. It takes time to do.

  Accordingly, an object of the present invention is to provide a planar heating element that uses leather as a base material and can warm the surface of the leather more quickly.

  According to the present invention, a through-hole is formed in the leather, and a conductive coating film is formed in conduction with the back surface of the leather and the inside of the through-hole, and the conductive coating film is energized. It is a planar heating element that generates heat. In the present invention, the leather includes natural leather, synthetic leather and artificial leather.

  According to such a planar heating element, since the conductive coating film is formed so as to conduct to the back surface of the leather and the inside of the through-hole, not only the back surface of the leather can be energized by energizing the coating film. Heat is also generated inside the through hole. By generating heat even inside the through hole, heat is generated near the surface of the leather, and the surface of the leather can be quickly warmed.

  As one embodiment, there is one in which the back surface of the leather and the through hole are connected by a curved surface. In this case, the conductive coating film hardly breaks at the boundary between the back surface of the leather and the through-hole, and electricity passes more reliably into the through-hole. Therefore, the surface of the leather can be warmed more reliably and promptly.

  In a vehicle seat, such a sheet heating element can be arranged such that the surface of the leather constitutes a seating surface, and a sheet heater that generates heat by energizing the sheet heating element can be configured.

  ADVANTAGE OF THE INVENTION According to this invention, the planar heating element which can warm the surface of leather more rapidly can be provided by using leather as a base material.

It is a perspective view of the planar heating element concerning Embodiment 1 of the present invention. It is II-II sectional drawing of the planar heating element shown by FIG. It is sectional drawing which shows the cross section of the planar heating element which concerns on Embodiment 2 of this invention corresponding to FIG.

<Embodiment 1>
An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the planar heating element 11 of the present embodiment uses leather 13 as a base material. The leather 13 has a plurality of small through holes 21 penetrating the front and back. The through hole 21 is formed by punching the leather 13 into a columnar shape.

  A conductive coating 31 is formed on the back surface 15 of the leather 13 as a heating element. In addition, the back surface 15 of the leather 13 is a surface on the opposite side to the surface 17 constituting the design surface. The conductive coating film 31 is formed by applying a conductive ink, a conductive paint, a conductive paste, or the like containing fine particles of a conductive material such as carbon or a metal such as silver or copper. In the present embodiment, the conductive coating 31 as a heating element is formed of a conductive ink containing carbon. The conductive coating 31 is formed in a striped pattern on the back surface 15 of the leather 13 so as to interfere with at least a part of the plurality of through holes 21. As shown in FIG. 2, the conductive coating film 31 is continuously formed from the back surface 15 of the leather 13 to the inner wall 23 of the through hole 21. The conductive coating 31 is formed over the entire length in the insertion direction inside the through hole 21.

  As shown in FIG. 1, on the back surface 15 of the leather 13, current-carrying portions 41, 41 that connect the bands in parallel are provided at both ends of the bands that form the stripe pattern of the conductive coating 31. Yes. Each energization part 41 consists of a strip-shaped conductive coating formed so as to straddle both ends of each strip of the conductive coating 31. It is preferable that the coating film as the energizing portion 41 is a conductive coating film having a lower resistance value (easy to conduct electricity) than the conductive coating film 31 as a heating element. In this embodiment, the electricity supply part 41 is formed with the conductive ink containing silver.

  According to the sheet heating element 11, the conductive coating film 31 generates heat by energizing the conductive coating film 31 through both the energizing portions 41 and 41. Since the conductive coating 31 is continuous with the back surface 15 of the leather 13 and the inside of the through hole 21, and electricity is conducted through the inside of the through hole 21 to generate heat, the surface 17 of the leather 13 can be quickly warmed. it can.

  With such an action function, for example, in the vehicle seat, the planar heating element 11 can be disposed on the seating surface of the seat (surface portion where the seated person comes into contact) to constitute a seat heater. That is, the sheet is mounted with the sheet heating element 11 and arranged so that the surface 17 of the leather 13 is exposed on the seating surface. If it does so, the inside of the through-hole 21 will also generate | occur | produce heat, a position near a seated person will generate | occur | produce, and a seated person can be made to feel warmth quickly. Moreover, compared with the case where a heat generating body is provided only on the back surface 15 of the leather 13, the surface 17 can be brought to the target temperature with less power.

<Embodiment 2>
Another embodiment of the present invention will be described with reference to FIG. About this embodiment, the part which does not require a change from Embodiment 1 is shown with the same code | symbol in a figure, and detailed description is abbreviate | omitted. In the present embodiment, the back surface 15 of the leather 13 and the through hole 21 are connected via a curved surface 25 having a shape that expands the through hole 21. That is, the boundary between the back surface 15 and the through hole 21 is smoothly connected and has no corners.

  In this case, the conductive coating 31 is less likely to be cut off at the boundary between the back surface 15 of the leather 13 and the through hole 21, and can be more reliably energized to the inside of the through hole 21. Therefore, the position close to the seated person can be more reliably heated. Further, since the film is hardly cut off, the conductive coating film 31 can have a resistance value more reliably set to a target value, and thus a target heat generation temperature can be obtained.

<Other embodiments>
The present invention is not limited to the above embodiment. For example, the conductive coating film 31 constituting the heating element may be formed in the through-hole 21 up to the middle of the insertion direction. However, if it is formed over the entire length in the insertion direction, the surface 17 of the leather 13 can be warmed more quickly.
Moreover, although the through-hole 21 may be block | closed with the electroconductive coating film 31, it is preferable that the through-hole 21 is not plugged from the viewpoint of prevention of a seated person's stuffiness etc. in the vehicle seat. In the case where the rigidity of the leather 13 is lowered by increasing the diameter of the through hole 21 in order to prevent the through hole 21 from being blocked by the conductive coating film 31, the rigidity is increased as a material of the conductive coating film 31. The material that can be used can be selected or added. Alternatively, a backing base fabric can be laminated on the leather 13 and the rigidity can be adjusted by the thickness.
Further, for example, the arrangement pattern of the conductive coating film 31 is not limited to a stripe shape. For example, a meandering shape may be provided, and energization portions may be provided at both ends thereof. In addition, for example, solid coating may be performed. In addition, although the example which formed the electricity supply part with the electroconductive coating film was shown in the said embodiment, it is not limited to this. For example, an energization part can also be constituted by attaching a copper tape or a silver tape.

  Although it is generally not preferable from the viewpoint of design that the heating element is visually recognized from the surface side of the leather 13, in the present invention, since the heating element is the conductive coating film 31, the conductive material as the material is conductive. Depending on the selection of the color of the characteristic ink or the like, it can be made inconspicuous or a part of the design can be constituted.

DESCRIPTION OF SYMBOLS 11 Surface heating element 13 Leather 15 (Leather) back surface 17 (Leather) surface 21 Through-hole 23 Inner wall 25 Curved surface 31 Conductive coating film 41, 41 Current-carrying part

Claims (3)

  A surface in which a through hole is formed in the leather and a conductive coating film is formed in conduction between the back surface of the leather and the inside of the through hole, and heat is generated by energizing the conductive coating film. Heating element. The planar heating element according to claim 1,
A sheet heating element, wherein a back surface of the leather and the through hole are connected by a curved surface. The sheet heating element according to claim 1 or 2 is arranged so that a surface of the leather constitutes a seating surface, and a sheet heater that generates heat by energizing the sheet heating element is configured. , Vehicle seats.

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