JPS5827637B2 - Koushiyuuhakanetsouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a high-frequency heating device having a novel door structure that is simple in structure and has a remarkable effect of preventing leakage radio waves.

Conventionally, high-frequency heating devices have been equipped with a metal contact part, a choke part, a radio wave absorbing material, etc. in the opposing part of the door and the front wall of the oven in order to block radio waves leaking from the door periphery, and these are made of a large number of small holes. It is attached to the door frame together with the door front plate formed with a.

Therefore, the structure of the door body becomes very complicated and expensive, the thickness and weight of the door increases, and the mounting part also needs to be strong.

The present invention provides a high frequency power 11 heat device which eliminates the above-mentioned conventional drawbacks by simplifying the structure of the door and effectively performs leakage radio waves (0) Vjy'-+. It is something.

The present invention will be explained in detail below with reference to the embodiments shown in the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In the figure, 1 is a door for opening and closing part of the oven 2, and 3 is a front plate of the door 1. The front plate 3 is made of a metal plate, and when the door 1 is closed, In the part facing the opening of 2, there are many small holes 4.4,...
The punching plate part that forms the is integrated.

Reference numeral 5 denotes a front wall of the outer casing of the oven 2, and a flat part 6 is formed on the oven opening side of the front wall 5 of the outer casing and projects over the entire circumference. A continuous depressed flat portion I is formed at the stepped portion.

When the door 1 is closed, the inside of the front plate 3 makes metal contact with the flat part 6 of the front wall 5 of the outer case. 9 is a sash serving as a frame for the outer periphery of the door having a U-shaped cross section.

The outer peripheries of the front plate 3 and the transparent plate 8 are integrally fixed together with the dielectric 11 by the sash 9, forming a fan-shaped door as shown in FIG.

In this case, the cavity 1 limited by the sash 9 and the front plate 3
A dielectric 11 is provided inside the cavity 10, and the length a from the opening of the cavity 10 to the terminal short-circuit surface is set to a wavelength of 34.
Form a wavelength choke.

The inner peripheral surface of the sash 9 comes into contact with the flat part 7 of the front wall 5 of the outer case when the door 1 is closed, and the opening of the cavity 10 faces the stepped part of the front wall 5.

FIG. 2 shows another embodiment of the present invention, and parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In the embodiment shown in FIG. 2, the choke has a double structure to further enhance the effect of shielding leakage radio waves.

In this embodiment, the front plate 3 is not in direct contact with the flat part 6, but an L-shaped sealer plate 12 is provided protruding from the front plate 3, and this radio wave shielding plate 12 is brought into contact with the flat part 6 of the front wall 5. Make it.

The peripheral edge of a transparent plate 13 made of glass, resin, etc. is sandwiched between the radio wave shielding plate 12 and the front plate 3, and extends from the opening of the cavity 14 defined by the radio wave shielding plate 12 and the front plate 3 to the terminal short-circuit surface. A choke is formed by setting the length l] to h wavelength or % wavelength.

In this case, one of the lengths a and b from the opening of the cavities 10 and 14 to the terminal short-circuit surface is selected to be an odd multiple of the H wavelength, and the other is set to an odd multiple of the wavelength or % wavelength.

Therefore, according to the embodiment shown in FIG. 2, leakage of the fundamental wave can be effectively prevented by using a double choke structure for the H wavelength, and also by using a double choke structure for the wavelength and h wavelength. In this case, leakage of the fundamental wave and first harmonic can be effectively prevented 1)=
can do.

The embodiment shown in FIG. 3 is an improvement on the embodiment shown in FIG.

In the embodiment shown in FIG. 2, a transparent plate 1 is provided in the cavity 14.
In the embodiment shown in FIG. 3, a dielectric material 15 is inserted into the cavity 14 in order to reduce the substantial size of the cavity 14. One end of this dielectric 15 is made to protrude outward from the opening of the cavity 14 to form a protrusion 16 for fixing the transparent plate 13.

Therefore, the transparent body 13 inside the door 1 has a cavity 14
The peripheral edge is supported by a protrusion 16 of a dielectric 15 provided inside,
Other structures are the same as the embodiment shown in FIG.

As explained in connection with the following embodiments, the high-frequency heating device of the present invention includes a door front plate that integrates a punching plate, and a transparent plate made of a glass plate or resin, which is arranged in parallel with this front plate, at the periphery. Since it is integrally fixed to the U-shaped sash that forms the frame of the outer periphery of the door so as to be covered by the sash, the door of the high-frequency heating device can be made significantly thinner and lighter than conventional ones. As the weight of the door is reduced, the structure of the door attachment part can be simplified, which makes it possible to reduce the price.

In addition, it is possible to provide an easy-to-use device that allows the window to be sharpened, and since the peripheral edge of the door front plate is inserted and fixed, it works in conjunction with this door front plate to form a chalk using a part of the satsushi. Therefore, it is possible to provide a high-frequency heating device with a simple structure and a remarkable effect of preventing leakage radio waves.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main part of one embodiment of the present invention, FIGS. 2 and 3 are the same and a block diagram of the main part of another embodiment, and FIG. 4 is a perspective view of the external appearance of a window used in the present invention. It is a diagram. 1: Door, 2: Oven, 3: Door front plate, 4: Small hole, 8
: Transparent plate, 9: Satsushi, 10.14: Cavity.

Claims (1)

[Claims] 1. A flat part protruding all around is formed on the oven opening side of the front wall of the oven casing, and a recessed flat part 7 is formed on the outer periphery of the oven, which is continuous with the flat part at a stepped part. A conductive door front plate with a large number of small holes facing the oven opening and a transparent plate arranged in parallel with this front plate are integrally fixed together with the dielectric material by a sash at the periphery. In addition, a high frequency heating device is provided with a door in which a choke is formed so that the length from the opening of the cavity defined by the sash and the door front plate to the terminal short-circuit surface is H wavelength.