| 摘要 |
A food weight sensing device for a microwave oven, which comprises a fixed electrode plate and a movable electrode plate which vary in overlapping area, according to a vertical movement of a movable spacer caused by the weight of a food to be measured. A capacitance signal indicative of the variation in overlapping area is converted into a frequency signal, so as to sense precisely the weight of food. The device comprises a fixed spacer, a movable spacer being movable with respect to the fixed spacer, a pair of plate springs disposed between the spacers, a weight sensing fixed member fixedly mounted beneath a base plate of the microwave oven and having a vertically extending actuating chamber opened at one end thereof, a fixed electrode disposed in the actuating chamber and having a fixed electrode plate being attached to an inner surface of the weight sensing fixed member defining the actuating chamber, and a movable electrode fixedly mounted at its lower portion to the movable spacer and having a movable electrode plate being vertically movable through the actuating chamber while maintaining a parallel state with the fixed electrode plate.
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