| 摘要 |
<p>A flexible electric heater (10) which eliminates the need for long copper conductors, simplifies electrical connections and provides for heating closely along the side edges of the sheet heater includes a thin elongated polyester (Mylar) substrate (12) having a semiconductor pattern (14) printed on the surface and having a pair of spaced connector portions (26) and a pair of U-shaped heating portions extending in opposite directions from and electrically connected to the connector portions (26). The U-shaped heating portions each include a pair of leg portions (18) lying close to the side edges of the substrate and joined by a U-shaped end portion (22). The connector portions (26) have a higher electrical conductivity than the heating portions and a metallic conductor (30) is disposed in face - to - face engagement with each of the connector portions (26) and has an area that is less than that of the respective connector portion (26) and an area: perimeter ratio not greater than D/2, wherein D is the major dimension of the conductor (30). A thin polyester cover sheet overlies the substrate (12), semiconductor pattern (14) and conductors (30) and is bonded to the substrate to form a hermetically sealed unit. Connector wires (40) are connected to the conductors (30) by metallic staples (44) penetrating the entire thickness of the heating device (10) including the respective conductors (30).</p> |
