| 摘要 |
<p>The composite sheet (1) comprises two glass leaves sandwiching a thin, e.g. 0.8 mm, separating layer of thermoplastic material, e.g. polyvinyl butyral or polyurethane. The resistor wires, e.g. of tungsten about 0.02 mm diameter, are laid, during manufacture, in generally vertical thermally formed undulating channels, on one face of the separating layer. The resistor wires are connected in parallel at each end by, e.g. three, closely parallel copper conductors, also laid in prepared channels, crossing under - optimally over - the resistor wires. Soldered joints may be unnecessary if the assembly is completed with sufficient pressure. Feed conductors terminate in snap-on connectors, optimally wholly contained within recesses in the central layer, the external circuit connector penetrating the latter to complete the connection.</p> |
