| 摘要 |
A glass-ceramic cooktop with a plurality of metallic film heaters of circular pattern bonded to the underside thereof. Each turn of the film heater has a generally uniform electrical resistance per unit of length throughout its length and is shown of constant width. The resistance per unit of length of each turn increases from each turn to the next from the centermost turn of the circular pattern to the outermost turn so the widest turn is at the center, and each turn decreases in width from the centermost turn to the outermost turn. The spacing between turns is minimal and substantially uniform throughout. The film heater has a pair of adjacent terminal sections of relatively low resistance per unit area to reduce the temperature of the portion sections. the glass-ceramic plate in the vicinity of the terminal section. |
