JPH0140465B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to prevention of radio wave leakage in microwave ovens and the like which are high frequency heating devices.

Structure of conventional example and its problems In a conventional microwave oven, which is a high-frequency heating device, for example, in order to prevent leakage of high-frequency waves from the opening of the heating chamber, the peripheral edge of the door provided at the opening of the heating chamber is In addition to providing a chiyoke groove with a depth of 1/4 of the wavelength used, a ferrite, which is a radio wave absorber, is provided in the approximately U-shaped sash facing the periphery of the door, or a ferrite is provided on the periphery of the door. A periodic structure having slits at regular intervals may be provided in the chain yoke groove (as shown in Figure 2 of JP-A-55-166895), or a periodic structure may be provided in the periphery of the door and a periodic structure having slits at regular intervals. A structure in which a slit is provided in the approximately U-shaped sash provided in the
(as shown in Figure 3 of Publication No. 39617).

However, although these devices satisfy a certain amount of radio wave leakage prevention standards, they have the disadvantage that they have a complicated structure, resulting in poor productivity and the inability to reduce costs.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a high-frequency heating device that does not cause leakage of radio waves and has excellent productivity.

Configuration of the Invention In order to achieve the above object, the high frequency heating device of the present invention includes a heating chamber that accommodates an object to be heated, a door that is provided in an opening of the heating chamber so as to be openable and closable, and a door that is in surface contact with the door. a substantially U-shaped sash protruding from an extension of the opening peripheral plate of the heating chamber, and a slit provided in a chiyoke groove provided at the peripheral edge of the door, and a slit facing the chiyoke groove. and the opening of the chiyoke groove is provided between the outer plate and the inner plate of the door, facing the opening peripheral plate of the heating chamber,
Even if the size of the door is reduced, there is no leakage of radio waves, so the main body can be made smaller, and the structure of the door and the sash that faces the door's periphery is simple, making it easier to assemble. This has the advantage that it is possible to provide a high-frequency heating device that is highly productive, has a beautiful appearance, and is easy to use.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, reference numeral 1 denotes a main body of a high-frequency heating device, and a door 3 is provided at the opening of a heating chamber 2 provided in the main body 1 so as to be openable and closable. 4 is an operation panel provided on the front of the main body 1, and this operation panel 4 has a timer knob 5 for controlling the heating time.
A cooking start button 6 and a cooking display lamp 7 are provided.

In FIG. 2, reference numeral 8 denotes a high frequency generator that supplies high frequency waves into the heating chamber 2. As shown in FIG. Reference numeral 9 denotes a radio wave stirring blade that stirs the high frequency waves supplied into the heating chamber 2, and is used to improve the distribution characteristics of the high frequency waves within the heating chamber 2. 10 is a sash provided opposite the peripheral edge of the door 3.

FIG. 3 shows the structure of the door 3 and the sash 10 shown in FIG. Bend it into a roughly L shape, and then
As shown in the figure, it is bent upward and inward into a substantially U-shape, and the ends are bent inward.
Reference numeral 14 denotes a slit provided at the end of the door outer panel 11, and this slit 14 can be made when the door outer panel 11 is molded. 15 is a door inner plate, and by attaching this door inner plate 15 to the door outer plate 11 with screws 16, the transparent body 17 provided on the door inner plate 15 is held, and the door inner plate 15 and the door outer plate are held together. 11 constitutes a chiyoke groove 18 having a depth of 1/4 of the wavelength used. Reference numeral 19 denotes an opening of a chain yoke groove provided between the end of the door inner plate 15 and the slit 14 of the door outer plate 11. A transparent body 20 is made of a material that absorbs or transmits radio waves and constitutes the exterior of the door 3. This transparent body 20 is made of a material that absorbs or transmits radio waves, and is a transparent body that forms the exterior of the door 3. The end of the plate 15 is covered with the door 3.
It consists of Reference numeral 21 denotes an opening peripheral plate of the heating chamber 2 with which the door inner plate 15 makes surface contact when the door 3 is closed.A substantially U-shaped sash 10 is attached to the extension of the opening peripheral plate 21 by screws 22 to attach the main body 1. It is provided so as to protrude forward. Reference numeral 23 denotes slits provided in the sash 10 at regular intervals on the periphery of the door 3 as shown in FIG. are doing. This slit 23 can be made when molding the sash 10. Reference numeral 25 denotes a cover that covers the sash 10 and the slit 23 provided in the sash 10, and the cover 25 is made of a material that absorbs or transmits radio waves.

The operation of the above configuration will be explained below.
First, the object to be heated is placed in the heating chamber 2, the cooking time is set using the timer knob 5, and when the cooking start button 6 is pressed, the high frequency generator 8 is activated to supply high frequency waves into the heating chamber 2, and the Objects can be heated dielectrically.

The high frequency waves supplied into the heating chamber 2 are prevented from leaking out of the heating chamber 2 due to the surface contact between the opening peripheral plate 21 of the heating chamber 2 and the door inner plate 15. The high frequency waves leaking from between the inner plates 15 are absorbed into the chiyoke groove 18 provided at the periphery of the door 3.
and enters into the chiyoke groove 24 of the sash 10 provided opposite the peripheral edge of the door 3. The high frequency waves that have entered into the cheese yoke grooves 18 and 24 are transmitted through the slits 2 provided in the sash 10 and the door outer panel 11.
3 and 14, the movement in the X and Y directions is restricted, and movement in the Z direction is restricted by the opening 1 of the chi yoke groove 18.
9 can be regulated. Also, the chiyoke groove 18
Radio wave leakage in the Y direction at the opening 19 can be restricted by a slit 23 provided in the sash 10. In addition, the door inner plate 15 and the opening peripheral plate 21
The high frequency waves leaking from the gap are changed in the perpendicular direction in the sash 10, and the high frequencies are further attenuated by the change in impedance caused by the slits 23.

As described above, according to the high-frequency heating device of this embodiment, even if high-frequency waves leak from between the opening peripheral plate 21 of the heating chamber 2 and the door inner plate 15 that are in surface contact with each other during cooking, the high-frequency waves can be prevented from leaking to the peripheral edge of the door 3. The high frequency waves leaking out of the main body 1 can be restricted by the check groove 24 provided in the sash 10 and the check groove 18 provided in the door periphery, thereby causing radio interference to other devices. This is a high-frequency heating device that never fails.

In addition, the slit 1 provided at the end of the door outer plate 11 and the sash 10 forming the yoke groove 18
4 and 23 can be formed when molding the door outer panel 11 and the sash 10, and the structure of the door 3 can be simplified, so that assembly workability is good and the cost can be provided at low cost.

Furthermore, by providing the opening 19 constituting the chiyoke groove 18 between the door outer plate 11 and the door inner plate 15 without facing the opening peripheral plate 21, the dimensions of the door inner plate 15 in surface contact with the opening peripheral plate 21 are reduced. It becomes possible to shorten L, and the main body 1 can be downsized.

In addition, the front surface and peripheral portion of the door 3 and the sash 10 provided on the peripheral portion of the door 3 are connected to a transparent body 20 made of a material that absorbs or transmits radio waves, and a cover 25.
By covering the cheese yoke grooves 18 and 24 with food scraps, the high frequency heating device becomes easy to clean and easy to use even if food particles adhere to the grooves 18 and 24.

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

(1) The high frequency waves leaking from between the opening peripheral plate of the heating chamber and the door inner plate are attenuated by the action of the slits provided in the cheese yoke groove on the door peripheral edge and the slits provided in the approximately U-shaped sash. can be prevented from leaking out of the main body.

(2) The opening of the chiyoke groove provided on the periphery of the door is provided between the door outer plate and the door inner plate so as to face the sash that protrudes from the opening periphery plate without facing the opening periphery plate of the heating chamber. This makes it possible to reduce the overlap between the opening peripheral plate and the outer dimensions of the door that makes surface contact with it, thereby making it possible to downsize the main body.

(3) A chiyoke groove is provided on the outermost periphery of the door facing the sash, and a slit is provided on the outer plate of the door facing the sash in the thickness direction of the door, thereby independently preventing leakage radio waves. Since attenuation can be designed, it is possible to design what kind of high frequencies are to be attenuated.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a high-frequency heating device that is an embodiment of the present invention, Fig. 2 is a sectional view of the same side, Fig. 3 is an enlarged sectional view showing the main part of Fig. 2, and Fig. 4 is the same side sectional view. FIG. 3 is a perspective view of the door outer panel shown in FIG. 3, and FIG. 5 is a perspective view of the sash shown in FIG. 3. 2...Heating chamber, 3...Door, 10...Sash, 11...Door outer plate, 14...Slit, 15
...Door inner plate, 18...Tail yoke groove, 19...Opening, 23...Slit, 24...Third yoke groove.

Claims (1)

[Scope of Claims] 1. A heating chamber that stores an object to be heated, and a heating chamber that is provided in an opening of the heating chamber so as to be openable and closable, and that is provided so as to face and be in surface contact with a peripheral plate of the opening of the heating chamber. The door has an inner plate and an outer plate, and the inner plate and the outer plate form a single chiyoke groove, and an extension of the opening peripheral plate of the heating chamber is arranged so as to face the outermost periphery of the door. a sash protruding from the sash, a chiyoke groove opening is provided at the outermost periphery of the door facing the sash, and a slit is provided in the outer plate of the door facing the sash in the thickness direction of the door. A high-frequency heating device with the following configuration. 2. The high-frequency heating device according to claim 1, wherein the leading end of the door outer panel is bent inward in a substantially U-shape.