JPS6359238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a radio wave seal for a high frequency heating device, and aims to improve safety and provide a more economical structure.

Conventional configurations and their problems Conventional radio wave seal configurations include those that use a chiyoke damping groove and a radio wave absorber, or those that use a chiyoke damping groove 1 and a periodic structure 2 together as shown in Fig. 1. is used. In the latter radio wave seal configuration, a radio wave short circuit is formed by the action of the periodic structure 2, so surface contact between the door inner plate 3 and the heating chamber opening wall surface 4 is incomplete or the gap is large. It has a blocking effect and can maintain radio wave sealing performance.

However, as a method for fixing the periodic structure 2 to the door outer panel 5, methods such as spot welding or caulking have been used. As a result, there were processing problems such as welding coming off, caulking coming off, and dimensional accuracy of the fixed position of the periodic structure.

OBJECTS OF THE INVENTION It is an object of the present invention to overcome the above-mentioned conventional drawbacks, to improve safety, and to provide a more economical construction.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a door that can be opened and closed at the opening of the heating chamber, and a first groove opening and a short-circuit end portion on the periphery of the opening of the heating chamber and the door opposite thereto. In the radio wave seal structure, the first groove and the second groove are divided by a conductor plate having parallel grooves and cut portions periodically in the longitudinal direction of the groove. , the groove is formed of a metal plate, and the conductor plate having periodic notches is formed by cutting and raising a part of the metal plate forming the groove, and is integrally formed with the groove. It has excellent radio wave sealing performance.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be explained as shown in FIGS. 2 and 3.
This will be explained based on the diagram.

FIG. 2 shows an embodiment of the present invention through a partial sectional view of a radio wave seal structure of a high frequency heating device. FIG. 3 is a partially cutaway perspective view of the same portion.

A part (portion A) of the door outer plate 5 forming the radio wave attenuation groove 1 is cut and raised at equal intervals to form a comb-shaped periodic structure 2. The periodic structure 2 forms a first groove Z ₁ and a second groove Z ₂ having a groove opening and a short-circuit end.
The structure is such that they are installed in parallel.

The operation of the above configuration will be explained below. When the door is closed, the radio waves inside the heating chamber 7 are
Surface contact between the opening wall 4 and the door inner plate 3 reduces leakage of radio waves to the outside. If the surface contact is not perfect or the gap is large, the radio waves cannot be completely blocked and the radio waves will proceed to the next radio wave attenuation groove 1.
Attenuation can be achieved by grooves _Z1 , which are cut and raised into the grooves and are partitioned by the periodic structure 2 and serve as the yoke damping grooves. As shown in Figure 3,
The radio waves toward the radio wave attenuation groove 1 are divided into two direction components (X, Z)
Considering that the radio waves propagate in the direction of synthesis, the periodic structure 2 regulates the radio waves in the X direction, and the chiyoke attenuation groove regulates the radio waves in the Z direction, making the attenuation effect of the radio wave attenuation groove 1 extremely high. be able to.
Therefore, almost no radio waves leak from the cutout hole (part B) created by cutting up the periodic structure 2 in the outer groove _Z2 partitioned by the periodic structure 2. .

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Since no welding or caulking is required to fix the periodic structure, there are no factors that harm the radio wave sealing performance due to their coming off or the dimensional accuracy of the fixed position of the periodic structure.

(2) Since it is simpler than the conventional door structure, it is easy to mass produce and is economical.

(3) Since there are fewer composite parts, the door can be made lighter and easier to use.

[Brief explanation of the drawing]

FIG. 1a is a partial cross-sectional view of a conventional radio wave seal configuration, FIG. 1b is a partially cutaway perspective view of the same part, and FIG. A partially sectional view, and FIG. 3 is a partially cutaway perspective view of the main part. 1... Radio wave attenuation groove, 2... Periodic structure, 3...
Door inner plate, 4...Opening wall surface, 5...Door outer plate,
6...Plastic cover, 7...Heating chamber, 8...
...Welding or caulking.

Claims (1)

[Claims] 1 A door covering the heating chamber opening of the main body is provided to be openable and closable, and a first groove and a second groove having a groove opening and a short-circuit end are provided in at least one of the parts where the main body and the door face each other. The first groove and the second groove are divided by a conductive plate provided in parallel and having notches periodically in the longitudinal direction of the groove, and the groove is formed of a metal plate, A high-frequency heating device in which a conductive plate having a cut portion is formed by cutting and raising a part of a metal plate constituting the groove, and is integrally molded with the groove.