| 摘要 |
An air-heating device has flat heating elements (10) of positive temperature coefficient, each of which has an electrode (11) on each surface and metal heat-radiating structures (13) in contact with the electrodes (11). The heating efficiency is improved by the use of the radiating structures (13), and the number of PTC heating elements (10) may be reduced as compared with that used in conventional devices. Various forms of the radiating structures (13) are described. <IMAGE> |
