| 摘要 |
<p>A panel heater includes a metal plate (2) whose lower side is provided with a PTC ceramic (1). The area corresponding to the PTC ceramic on the upper side is covered with good heat insulator or air space (4). Materials (3) for conducting the heat of the metal plate are provided above the parts other than the ones above the PTC ceramic respectively, and further, a finishing plate (5) is provided on the top face of the metallic plate (2). Favorably, recessed type straight grooves are formed on the metallic plate (2) at required spaces by corrugating it, and on the undersides of the straight grooves the PTC ceramics (1) are provided, and in the straight grooves good heat insulator or air spaces (4) are provided, and further, the finishing plate (5) is provided on the top face of the metal plate (2). Thereby, a large load can be supported by a simple structure, and moreover, the panel heater having no local overheating can be obtained.</p> |
