JPH05283161A - Microwave oven - Google Patents

Abstract

PURPOSE:To make a door thin and lightweight and provide a very compact outer size with no leak of radio waves by slantly constituting the contact face between the outer periphery wall of the door of a microwave oven and a heating chamber, and providing a choke groove. CONSTITUTION:The opening section of a heating chamber 1 is shielded by a door 2, and the angle (a) of the contact face is slantly set to the range of 95-175 deg.. A flange 4 is formed around the opening section of the heating chamber 1, and a choke plate 5 is welded on its outer periphery. The flange 4 and the plate 5 are designed to form a preset choke groove 6 to shield radio waves, and the groove 6 is covered by a choke cover 7. The size L must be a fixed value or above to surely prevent a radio wave leak. When the contact face is inclined, both the side face of the heating chamber 1 and the door 2 can be made thin, and a very compact outer size can be obtained against the inner size.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a microwave oven, etc.
1 and 2 show a choke groove mounting structure to be used as shown in FIG. 1 and FIG. 2, particularly a structure in which a door is made thinner and lighter and a choke effect is enhanced, and an electromagnetic wave sealing structure of a microwave oven. Thing.

[0002]

2. Description of the Related Art Conventionally, a microwave oven door is provided with a choke groove 6 on the door side as shown in FIG. 5, and the contact surface between the door and the heating chamber is 90 ° with respect to the side surface of the heating chamber. Was generally used.

However, in such a structure, the contact surface between the choke groove, the door and the heating chamber must have a certain dimension L (experimental value of about 30 mm or more), and the total volume of the product per certain effective volume is compact. It was a big constraint for me.

On the other hand, in the conventional method, the thickness of the door is required to be a dimension necessary for the choke groove (about 20 mm or more in the experimental value), and the door tends to be felt large especially in a compact size microwave oven. ..

[0005]

[Problems to be Solved by the Invention] As described above, the microwave oven door that opens and closes the heating chamber is made thinner, the shape is made smaller and the electric wave leakage is eliminated. Therefore, the present invention has been made in consideration of the above circumstances, and an object thereof is to provide an extremely compact microwave oven without radio wave leakage.

[0006]

In order to achieve the above-mentioned object, the present invention is such that the outer peripheral wall of the door on the heating chamber side is inclined, and the contact surface between the outer peripheral wall of the door and the heating chamber is set to the side surface of the heating chamber. The heating chamber is inclined, and a choke groove is formed on the outer periphery of the heating chamber, and the choke groove is provided on the heating chamber side. In this case, the choke groove may be configured as a periodic structure body having a plurality of slits provided in a direction perpendicular to the heating chamber wall. In that case, it is common knowledge that the choke effect is efficient for radio waves of various angles emitted from the heating chamber to the outside.

[0007]

In the contact surface of the door that opens and closes the heating chamber, which comes into contact with the choke groove that is inclined on the outer circumference of the heating chamber, the metal contact and the choke groove between the outer peripheral portion of the heating chamber and the door, as shown in FIG. The radio waves are blocked and the leakage of radio waves can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an example of an enlarged cross-sectional view of a contact portion of a door of a microwave oven and a heating chamber according to the present invention. The heating chamber 1 is opened forward, and this opening is shielded by a door 2. Although FIG. 1 shows a closed state, FIG. 2 shows a state in which the door 2 is slightly opened, and the side surface of the opening of the heating chamber 1 is shown in FIG.
As shown in FIG. 3, a hinge 3 is provided, a flange 4 is formed in the main body around the opening, and a choke plate 5 is joined to the outer periphery of the main body by welding or the like. The flange 4 and the choke plate 5 of the heating chamber are designed to form a choke groove 6 having a predetermined shape and size in order to shield radio waves.
Is covered with a chalk cover 7.

Here, reference numeral 10 shown in FIGS. 2 and 3 is a turntable provided in the heating chamber for rotationally mounting an object to be heated. Further, the flange portion 4 has an angle (a) with respect to the side wall of the heating chamber 1 as shown in FIG.
It is configured at 75 ° or less.

On the other hand, as shown in FIG. 4, on the outer peripheral portion of the choke plate 5, there is provided a periodic structure of the choke plate 5 provided with a large number of slits 11 extending a predetermined distance in a direction perpendicular to the wall of the heating chamber. May be.

Furthermore, in order to surely prevent radio wave leakage,
It is necessary that the L dimension shown in FIG. 1 be a certain value or more. (Experimentally, the dimension L is required to be at least about 30 mm (mm) or more. Therefore, as shown in FIG. 5, conventionally, the dimension L from the heating chamber 1 to the outer peripheral cabinet 8 is:

[0012]

[Formula 1] L1 = L × | Sin (a) |

[0013]

## EQU2 ## Since Sin (a) <1, it is possible to make a compact microwave oven which has never been seen by reducing the L1 size by selecting and designing an appropriate size (a).

On the other hand, when the door 2 is closed in FIGS. 2 and 3, the external thickness of the door 2 (from the end face of the cabinet 8 to the surface of the door 2) can be made extremely small as shown in FIG. Therefore, it is possible to obtain an image in which the thickness of the door is hardly felt in appearance.

On the other hand, the door 2 has a recess 9 (dimension b) inside the heating chamber 1 (shown by a chain double-dashed line in FIG. 1),
By effectively utilizing this portion as the inside of the heating chamber 1, the door 2 that is extremely thin can be realized.

[0016]

As described above, according to the present invention,
Since the contact surface of the outer diameter of the door with the heating chamber side is inclined, both the heating chamber side and the door 2 can be freely thinned, so that the electronic size has an extremely compact external dimension with respect to the internal dimensions of the heating chamber 1. The range can be realized.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view taken along the line AA of the main part in FIG. 3 of the present invention.

2 is a partial cross-sectional view of the present invention with the door slightly open (FIG. 3).
(Corresponding to A-A side of)

FIG. 3 is an external perspective view of the microwave oven of the present invention.

FIG. 4 is a perspective view of an essential part of another embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a contact portion of a conventional microwave oven door and heating chamber (corresponding to FIG. 1).

[Explanation of symbols]

1 is a heating chamber, 2 is a door for opening and closing the heating chamber, 3 is a hinge for opening and closing the door, 4 is a flange of the main body, 5 is a choke plate, 6 is a choke groove, 7 is a choke cover, 8 is a cabinet, and 9 is a dent. Part, 10 is a turntable, and 11 is a slit.

Claims (2)

[Claims] 1. A heating chamber for heating food by electromagnetic waves, and a door which is openably and closably held in the heating chamber.
The contact surface between the outer peripheral wall of this door and the heating chamber is configured to be inclined,
A choke groove for attenuating electromagnetic waves is provided on the heating chamber side on the contact surface between the heating chamber and the door, and the angle between the inclined contact surface of the door and the side wall of the heating chamber is 95 ° or more and 175 ° or less. Microwave oven characterized by. 2. A periodic structure having a slit is provided on an outer peripheral portion of the choke groove.
Microwave oven as described.