초록 ▼

A container for holding a body of material such as foodstuff to be heated in a microwave oven, including a dielectric lid and/or other dielectric wall structure with at least two ontiguous dielectric wall portions of respectively different electrical thickness for cooperatively modifying the microwa

A container for holding a body of material such as foodstuff to be heated in a microwave oven, including a dielectric lid and/or other dielectric wall structure with at least two ontiguous dielectric wall portions of respectively different electrical thickness for cooperatively modifying the microwave electric field patterns that would obtain in the body during such heating if the lid and/or other dielectric wall structure were of uniform electrical thickness or were absent. At least one of the portions, preferably the portion of higher electrical thickness, may be so constituted as to undergo a change in dielectric constant during the microwave heating, thereby to alter the heating distribution in the body as heating proceeds.

대표청구항 ▼

A package of material to be heated in a microwave oven, comprising a container and a body of material to be heated disposed in the container, said container comprising an open-topped tray carrying the body of material and a lid covering the tray to form a cavity, the container and the body defining

A package of material to be heated in a microwave oven, comprising a container and a body of material to be heated disposed in the container, said container comprising an open-topped tray carrying the body of material and a lid covering the tray to form a cavity, the container and the body defining fundamental modes of microwave energy in said cavity, at least one extended surface of the container being provided with mode generating means for generating, within the cavity, at least one microwave energy mode of a higher order than that of said fundamental modes, the mode-generating means being dimensioned and positioned with respect to the body of material in the container for causing microwave energy in said at least one higher-order mode to propagate into the body of material thereby to locally heat the body of material, wherein the mode generating means comprises at least a first dielectric wall portion of the container defining a first region of the extended surface and a second dielectric wall portion of the container defining a second region of the extended surface contiguously surrounding the first region, one of these two wall portions having an electrical thickness substantially greater than that of the other.