JPS6046519B2 - heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a high-frequency power supply method for a high-frequency heating cooker, and in particular, the present invention relates to an improvement in a high-frequency power supply method in a high-frequency heating cooker. This provides a power supply method that does not take up much space.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall view of a product embodying the present invention, in which 1 is a body, 2 is a door that closes an opening 4, and 3 and 3' are electric heating heaters provided on the top of the body 1; It is used as a regular electric stove. An electric heater 5 is also provided inside the open 4, and a high frequency oscillator 7 such as a magnetron is attached to a partial extension 6 of the upper wall of the open, and serves as an antenna for the magnetron. A strip line is formed by the electrically connected flat conductor 8, the open upper wall, and its extension 6. Note that the width of the extension 6 of the open upper wall is usually set to a flat conductor 8 in order to minimize radiation loss during microwave transmission.
However, the ratio to the open top wall can be made even larger than this, and the radiation loss in the transmission line can be extremely reduced.

On the other hand, the flat conductor 8 is fixed to the open upper wall surface by a support 10 made of dielectric material, and the distance between the two is very small, on the order of several meters.

In addition, the tip of the flat conductor 8 is bent into an L shape,
A concave recess 9 is provided on the open top wall surface facing this, and this increases the distance between the flat conductor and the open top wall, so the radio wave transmission function as a strip line is performed in this part. It suddenly becomes smaller and the radio waves are radiated into the open area from this part. Conventionally, in order to achieve the same effect, the tip of the strip line was bent at a right angle as shown in Figure 5, but with this method, the effective height of the open circuit becomes smaller and the necessary effective height is reduced. In order to secure the height, the external dimensions must be increased accordingly, making it difficult to use for products that require extremely compactness. However, according to the present invention, as shown in FIG. 2, for example, if a concave recess 9 is provided in the upper wall of the open space between the heaters of an electric stove installed above the open space, the effective height can be completely reduced. It is possible to radiate radio waves into the open warehouse without causing any damage.
This is particularly advantageous for products where compactness is important.

In addition, if the antenna part is shaped like it protrudes into the open refrigerator as shown in Fig. 5, the antenna itself is easily damaged by being hit by containers, and it also looks unnatural and undesirable. Problems like bastards will be completely eliminated. Furthermore, as shown in FIG. 4, the distribution of radio waves can be improved by branching the flat conductor into a plurality of parts to feed power. Although not shown in the drawings, it is clear that in some cases, substantially the same effect can be obtained even if the flat conductor side is shaped in the same way instead of having a concave depression on the open side. As explained above, according to the present invention, in a heating cooker with a combined heating means, it is possible to effectively utilize the limited space inside the main body and provide an efficient power supply method that does not take up much space. .

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of a heating cooker showing an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the same, and Fig. 3 is a cross-sectional view of the main parts thereof.
FIG. 4 is a sectional view of another embodiment, and FIG. 5 is a sectional view of a conventional example. 1...Body, 4...Open, 5
...Electric heater, 6...Extension part, 7
...High frequency oscillator (magnetron), 8...
...A flat conductor.

Claims (1)

[Claims] 1 A main body includes a heating chamber, a high-frequency oscillator, a strip line for high-frequency coupling of the heating chamber and the high-frequency oscillator, and an electric heater, and the strip line uses the heating chamber wall and its extension as one conductor. , the other conductor is made of a flat metal, the distance between both conductors is made larger than other parts of the line at any point on the line, and the electric heater protects the flat metal. A heating cooker characterized by being installed in a position where