| 摘要 |
<p>An electrical sheet heater (10) for providing greater structural strength and integrity and a higher current carrying capability, said sheet heater including a substrate (12) of insulative material, a semi-conductor pattern (14) (typically of colloidal graphite) having a pair of spaced-apart conductor contact portions (16) and a heating portion (18) extending between and electrically connected to the contact portions (16), and a pair of conductors (22) one of which overlies and engages each of the contact portions. Each of the conductors (22) is wider than the respective underlying contact portion (16) of the semi-conductor pattern (14), and includes a pair a longitudinally-extending strip portion (26, 30) with a central portion (28) including a plurality of longitudinally-spaced openings (24) therebetween. The strip portion (26) at one edge of the conductor overlies and engages a respective contact portion (16) and a sealing layer (32) of insulating material overlies the respective conductors and is sealed to the substrate along the edges of the conductor and through the longitudinally-spaced openings (24).</p> |
