JPS6035195Y2 - microwave oven - Google Patents

Description

[Detailed explanation of the invention] This invention prevents microwave leakage with a choke in the direction perpendicular to the opening of the microwave oven body and with a metal body in the direction parallel to the opening of the microwave oven body, making it possible to perform an inexpensive and reliable seal. Regarding the microwave oven.

In conventional microwave ovens, due to microwave radio wave leakage,
In addition to forming a choke on the door, ferrite is used, but ferrite is not only expensive but also has the drawback of unstable performance.

However, using only a choke works on radio waves in a direction perpendicular to the opening of the microwave oven body, but does not work on radio waves in a parallel direction, resulting in radio wave leakage.

This idea was made with the above points in mind,
Next, this invention will be explained in detail with reference to drawings showing embodiments thereof.

First, FIGS. 1 to 4 showing one embodiment will be explained.

In these drawings, reference numeral 1 denotes a microwave oven body with an open front, and an inner frame 2 forms a cooking chamber 3.

4 is a control unit provided on the right side of the microwave oven main body 1; 5 is a door that closes the cooking chamber 3, which is provided on the front of the microwave oven main body 1 so as to be openable and closable; 6, a choke forming body 7 integrally provided on the inner circumferential edge of the door body 6, an annular choke induction body 8 provided on the circumferential edge of the rear surface and capable of freely coming into contact with the front surface of the opening of the microwave oven body 1, and a choke forming body 7 on the rear surface. A mesh 9 is arranged and whose peripheral edge is engaged with the choke induction body 8, and the peripheral edge of the mesh 9 is brought into contact with the rear piece 7' of the choke forming body 7.
It is screwed on.

A choke 10 is formed on the periphery of the door 5 by a choke forming body 7 and a choke dielectric 8, and has a total length that is an odd multiple of a quarter wavelength of the microwave.

Reference numeral 11 denotes a plurality of metal bodies affixed at equal intervals to the peripheral edge of the front surface of the choke dielectric 8. The metal bodies 11 are made of aluminum foil and have a width of 1/4 wavelength of the microwave. They are arranged with a width of 1/4 wavelength.

Therefore, in the connection between the opening of the microwave oven body 1 and the door 5, for radio waves in a direction perpendicular to the opening,
It can be sealed with a choke 10 as in the conventional case, and furthermore, a metal body 11 can be used for sealing against radio waves in a direction parallel to the opening.
A seal can be achieved by the damping area formed by the damping area.

That is, by arranging the metal body 11 on the choke dielectric 8, the microwave transmission path in the parallel direction of the opening can be replaced with a microwave transmission path as shown in FIG. This constitutes a radio wave circuit, which attenuates the microwaves.Moreover, since the metal bodies 11 are arranged in a ring, the number of stages becomes infinite, and the radio waves are attenuated and ultimately become zero, causing radio waves to leak. Never.

Next, FIG. 5 showing another embodiment will be explained.

The one shown in FIG. 5 is a choke dielectric 8 in which a plurality of metal bodies 11 each having a width of 1/4 wavelength of the microwave are molded at intervals of 1/4 wavelength of the microwave. In addition, a multi-stage standing wave circuit can be constructed by the metal body 11,
It can prevent radio wave leakage in the direction parallel to the opening.

Although the metal body 11 is inferior in terms of design, it is better to arrange the metal body 11 on the rear surface of the choke inductor 8 to prevent radio wave leakage.

As described above, according to the microwave oven of this invention, an annular choke derivative that contacts the front surface of the opening of the microwave oven body and forms a choke opening is provided on the openable/closable door of the microwave oven body. 1 of the microwave
By arranging a plurality of metal bodies with widths that are odd multiples of 74 wavelengths at regular intervals, it is possible to choke radio wave leakage in a direction perpendicular to the opening of the microwave oven body and to prevent radio wave leakage in a parallel direction. Metal objects can be prevented, and an inexpensive and reliable sealing structure can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the microwave oven of this invention, and Fig. 1 to Fig. 4 show one embodiment, Fig. 1 is a perspective view, Fig. 2 is a cutaway plan view of main parts, and Fig. 3 is a choke. FIG. 4 is a perspective view of a part of the dielectric, FIG. 4 is a diagram for explaining the principle, and FIG. 5 is a sectional view of a choke dielectric of another embodiment. 1...Microwave oven body, 5...Door,
8...Choke derivative, 10...Choke, 11...Metal body.

Claims (1)

[Scope of utility model registration request] A door that can be opened and closed in the microwave oven main body is provided with an annular choke derivative that comes into contact with the front surface of the opening of the microwave oven main body and forms a choke opening, and the choke derivative includes:
A microwave oven in which a plurality of metal bodies each having a width equal to an odd multiple of the 1/4 wavelength of a microwave are arranged at equal intervals for each width.