| 摘要 |
An electrical heating device comprises a substrate, an elongated conductor extending longitudinally of the substrate, a semi-conductor pattern carried on the substrate and electrically connected to and extending from the conductor pair, and a sealing layer overlying the conductor and sealed to the substrate at opposite sides of the conductor. The conductor comprises a pair of rectangular in cross-section metallic conductor elements, placed one on top of the other in face-to-face engagement with and unattached to each other. The bottom conductor elements faces towards the substrate and the upper conductor elements faces towards and engaging the sealing layer. Adjacent one end of the device, the upper conductor elements is folded back longitudinally upon itself to expose an upper surface of the lower conductor element and a lower surface of the upper conductor element, and wherein a wire engages and is electrically connected to the thus exposed upper surface of said lower conductor element and the thus exposed lower surface of said upper conductor element.
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