Cooking instrument using a microwave oven for heating a primary

Details Cooking instrument using a microwave oven for heating a primary Cooking instrument using a microwave oven for heating a primary

1990-11-26

1992-04-21

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055F, 99DIG14, H05B 680

Patent

active

051070871

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a cooking instrument (cooking container) for use in a microwave oven and more particularly tq a cooking instrument for a microwave oven which has a legs sticky cooking surface and which can easily and safely brown foodstuffs by heating itself up while preventing the from scorching and sticking.


BACKGROUND ART

The instruments used in cooking foods in a microwave oven are roughly classified into two groups.
Those in one group are free of the influence of microwaves and thus do not heat up themselves. Such cooking instruments include heat-resistant glass containers and containers made of plastic such as polypropylene and polycarbonate. These containers have only the function as vessels or containers.
Those in one other group contain ferroelectric substances such as ferrite (Fe.sub.3 O.sub.4). When the ferroelectric substances are dielectrically heated by microwaves, the foods in the oven are heated by the heat thus produced. Examples of this type are disclosed in Japanese Unexamined Patent Publications 60-223919 and 61-138028.
Of these prior art cooking containers, the latter has a plate in the form of a metal sheet providing a cooking surface and having a ferroelectric material bonded to its back. The dish has its sides bonded to a vessel made of plastic or the like. Thus it was difficult to keep the balance between heat buildup and heat dissipation with such a container.
For the above-described reasons, the prior art cooking containers had the following problems:
I) It is rather difficult to brown the food.
II) If food which is liquid before cooking and solid after cooking and which has a high microwave absorption capacity (e.g. an egg sunny-side up) is cooked in a microwave oven, it might potentially blow up and scatter.
III) If the heat is increased to solve the above problems I and II, the container itself might get broken due to heat storage.
It is an object of the present invention to solve such problems.


DISCLOSURE OF THE INVENTION

The present invention consists of a cooking instrument for use in a microwave oven having a metal plate, a fluororesin layer provided on top of the metal plate, a heat buildup layer provided on the bottom of the metal plate and adapted to be dielectrically heated by microwaves, and a covering permeable to microwaves and provided on the outside of the heat buildup layer, part of the covering being partially formed into legs.


BRIEF DESCRIPTION OF THE DRAWING

FIGS. 1A and 1B are sectional views of the embodiment of the cooking instrument for a microwave oven according to the present invention.
FIG. 2 is a graph showing the relationship between the ferrite in the heat buildup layer and the heat buildup characteristics when heated in a microwave oven.
FIG. 3A is a bottom plan view of the embodiment in which the heat buildup layer is thinner at portions where heat dissipation is low than at the remaining portion and FIG. 3B is a sectional view taken along line III--III of FIG. 3A. Broken lines indicate the positions of the legs after the covering has been formed. Slanting lines indicate the portion where the thickness is lower than the other portion.
FIG. 4 shows the optimum ranges of the composition of the ferroelectric substances contained in the heat buildup layer and the average thickness of the heat buildup layer.
FIG. 5A is a sectional view of another embodiment according to the present invention, FIG. 5B is an enlarged view of the layer for preventing dielectric breakdown, and
FIG. 5C is an enlarged view of a modified dielectric breakdown protective layer.
FIGS. 6A and 6B show the results of experiments conducted to determine the upper limit of the thickness of the dielectric breakdown protective layer. FIG. 6A illustrates how the experiment was done and FIG. 6B is a graph showing the results of experiment.
FIG. 7 is a sectional view of still another embodiment according to the present invention.


BEST MODE FOR EMBODYING THE INVENTION

In order to describe the present invention in more detail, it will be described

REFERENCES:
patent: 4413167 (1983-11-01), Martel et al.
patent: 4450334 (1984-05-01), Bowen et al.
patent: 4454403 (1984-06-01), Teich et al.
patent: 4542271 (1985-09-01), Tanonis et al.
patent: 4558198 (1985-12-01), Levendusky et al.
patent: 4701585 (1987-10-01), Stewart

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