| 摘要 |
A sheet heater including a substrate, a semi-conductor pattern (typically of colloidal graphite) having a pair of parallel, spaced-apart, longitudinally-extending stripes and a central portion extending between and electrically connected to the stripes, and a pair of parallel, spaced-apart, longitudinally-extending conductors one of which overlies and engages each of the stripes. Each conductor is significantly wider than the underlying stripe of the semi-conductor pattern, and includes a longitudinally extending strip portions along the inner and outer edges of the conductor, and a plurality of longitudinally-spaced openings located therebetween. The strip portion at the inner edge of the conductor overlies and engages a respective stripe; and a sealing layer of insulating material overlies the respective conductor and is sealed to the substrate along the inner and outer edges of the conductor and through the longitudinally spaced openings.
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