초록 ▼

A food container for use in a microwave oven is disclosed. The container contains a plurality of food substances, and employs a metal shield to shield at least one of the food substances from microwave radiation. Arcing and other problems associated with the use of metal shielding are avoided by pro

A food container for use in a microwave oven is disclosed. The container contains a plurality of food substances, and employs a metal shield to shield at least one of the food substances from microwave radiation. Arcing and other problems associated with the use of metal shielding are avoided by proper selection of the geometry of the metal shield. The metal shield is preferably looped in a manner which provides some electrical inductance, and the ends of the metal shield are overlapped and separated by a dielectric material to provide some electrical capacitance. The geometry of the shield is selected so that the inductance and the capacitance in effect form a “tuned circuit”which minimizes problems associated with resonance and which eliminates arcing.

대표청구항 ▼

A package for differential heating of food material in a microwave environment employing a shield having a geometry selected to avoid arcing, comprising: a generally cylindrical container containing a food material to be heated by microwaves and having at least a portion of the food material which i

A package for differential heating of food material in a microwave environment employing a shield having a geometry selected to avoid arcing, comprising: a generally cylindrical container containing a food material to be heated by microwaves and having at least a portion of the food material which is to be shielded from microwaves; a conductive shield, the shield being wrapped around a portion of the generally cylindrical container near where the portion of the food material to be shielded is located, the shield having a circumference and a height, the shield having non-resonant dimensions to avoid arcing where the height and circumference are selected such that: [Figure] where ls is the resonant wavelength of the microwaves in the shield, h is the height of the shield, C is the circumference of the shield, and N and M are each integers, for example, 0, 1, 2, 3, 4, etc.; whereby resonance of the shield and resonant voltages at the edges of the shield are avoided to minimize arcing when the shield is exposed to the microwaves; and, the shield being operative to allow the food material to be heated by microwaves while substantially reducing the exposure of the shielded portion of the food material to the heating effects of the microwaves.