| 摘要 |
An oven (2), such as a microwave oven, comprises an oven cavity (6) having therein a rotatable turntable (8) for supporting one or more items (28, 30), such as food items, to be heated. A gradient electric heater (10) is located above the turntable (8) and incorporates at least one heating element (16) which is of overall substantially circular form and overlies the turntable substantially concentric therewith. Thus an item (28, 30) to be heated in the oven (2) is heated to substantially the same extent, when located on the turntable (8), substantially regardless of its position of location on the turntable. The at least one heating element (16) may have a power density at a substantially circular peripheral region (20) thereof which is greater than a power density at a central region (22) thereof. |
