Microwave oven for uniform heating

Details Microwave oven for uniform heating Microwave oven for uniform heating

2001-01-10

2002-05-07

Leung, Philip H. (Department: 3742)

Electric heating

Microwave heating

Enclosed cavity structure

C219S746000, C219S748000

Reexamination Certificate

active

06384392

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a microwave oven, and more particularly, to a uniform heating structure for a microwave oven which is capable of distributing microwaves generated by a magnetron more uniformly throughout the food being cooked in a cavity.
2. Description of the Background Art
Generally, a microwave oven is an apparatus for generating microwaves and cooking food by the microwaves.
Hereinafter, the structure and operation of a conventional microwave oven will be described.
As illustrated in
FIG. 1
, the microwave oven includes a casing(F) having a cavity
10
for cooking food therein at its center portion and an electric chamber
20
for generating microwaves at one side of the cavity
10
, and a door
70
hingeably connected to one side of the casing(F) and opening and closing the cavity
10
.
In detail, the cavity
10
includes a turntable
30
mounted on the bottom surface
11
of the cavity
10
, and a turntable motor(not shown) for rotating the turntable
30
.
And, as illustrated in
FIG. 2
, the electric chamber
20
includes a magnetron
40
for generating microwaves, a wave guide
50
for guiding the microwaves generated by the magnetron
40
to be radiated to the cavity
10
, a pair of openings
60
for converting the microwaves radiated from the wave guide
50
into circular polarized waves, and a high voltage converter(not shown) for supplying power to the magnetron.
The cavity
10
of the conventional microwave oven is formed to have a rectangular space. The sections of the openings
60
and wave guide
50
protecting the openings
60
which are provided at one side wall
12
of the cavity
10
are formed in a square. The square sections of the wave guide
50
and openings
60
are disposed in the same horizontal and vertical direction as the one side wall of the cavity to which the wave guide
50
and openings
60
are connected.
Hereinafter, the operation of the microwave oven will be explained.
When a user places food on the turntable
30
of the cavity
10
, and then applies power, the magnetron
40
generates microwaves, said microwaves being guided by the wave guide
50
to thus be radiated to the cavity
10
through the openings
60
. The food is heated by the microwaves radiated to the cavity
10
, and the turntable
30
is rotated by the turntable motor for uniform cooking performance.
Meanwhile, the essential point of cooking food by means of the microwave oven is how uniformly the microwaves generated by the magnetron are distributed to the food.
However, in the above-described rectangular-shaped structure for the cavity
10
of the conventional microwave oven, parts of the microwaves generated by the magnetron
40
are directly delivered to the food on the cavity
10
in the process in which the microwaves generated by the magnetron
40
are radiated to the cavity
10
through the wave guide
50
and the openings
60
. In addition, most of the microwaves are randomly reflected to an interior wall of the rectangular-shaped cavity
10
, thus causing an unpredictable distribution of the microwaves.
FIG. 3
is a view illustrating the distribution of microwaves generated in the cavity
10
of the conventional microwave oven. In
FIG. 3
, with respect to the strength of microwaves by colors, black indicates strong, gray indicates intermediate, and white indicates weak.
Therefore, the rectangular-shaped structure for the cavity
10
of the conventional microwave oven has a problem that ‘uniform portions’ and ‘non-uniform portions’ are formed while cooking food, which degrading the cooking performance of the microwave oven.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a uniform heating structure for a microwave oven which is capable of distributing microwaves generated by a magnetron more uniformly throughout the food being cooked in a cavity.
To achieve the above object, there is provided a uniform heating structure for a microwave oven according to the present invention, which includes: a magnetron for generating microwaves; a wave guide for guiding the microwaves generated by the magnetron; a pair of openings for radiating the microwaves guided by the wave guide in the form of circular polarized waves; and a cavity which is shaped in a polyhedron more than a rectangular and in which more than one interior walls constructing the polyhedron slope at a predetermined angle with respect to a neighboring interior wall.
Additional advantages, objects and features of the invention will become more apparent from the description which follows.


REFERENCES:
patent: 2814708 (1957-11-01), Blass
patent: 4361744 (1982-11-01), Mercier et al.
patent: 4490923 (1985-01-01), Thomas
patent: 5948310 (1999-09-01), Shon et al.
patent: 6097018 (2000-08-01), Kim et al.
patent: 62-128476 (1987-06-01), None
patent: WO 97/44988 (1997-11-01), None
patent: WO 98/35533 (1998-08-01), None

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