JP7021741B2 - Frequency selection plate and microwave oven heating container - Google Patents

Description

The present disclosure relates to a technique for selecting non-heating or non-drying by microwave to a non-heated object or non-drying object and heating or drying by microwave to a heated or dried object.

The techniques disclosed in Patent Documents 1 and 2 exist as techniques for selecting non-heating of a non-heated object by microwaves and heating of a heated object by microwaves. In Patent Document 1, a microwave oven is used to adjust the frequency and phase of electromagnetic waves to select between non-heating and heating by microwaves. In Patent Document 2, a metal foil is used to cover a non-heated object as viewed from an electromagnetic wave generator, thereby selecting between non-heating and heating by microwaves.

Japanese Unexamined Patent Publication No. 2016-129141 Japanese Unexamined Patent Publication No. 09-163939

However, in Patent Document 1, in order to adjust the frequency and phase of the electromagnetic wave, it is not possible to easily select non-heating by microwave and heating. Further, in Patent Document 2, since metal discharge is generated by the metal foil, it is not possible to safely select non-heating by microwave and heating.

Therefore, in order to solve the above-mentioned problems, it is an object of the present disclosure to easily and safely select non-heating or non-drying by microwave and heating or drying.

In order to solve the above-mentioned problems, a frequency selection plate for microwaves can be used to penetrate the surface of the non-heated object or the non-dried object and also penetrate the inside of the non-heated object or the non-dried object. , Blocks electromagnetic waves with frequencies for internal heating or internal drying.

Specifically, the present disclosure is capable of penetrating the surface of a microwave non-heated object or a microwave non-drying object and penetrating the inside of a microwave non-heated object or a microwave non-drying object. It is a frequency selection plate characterized by blocking electromagnetic waves having a frequency for microwave internal heating or microwave internal drying.

According to this configuration, it is possible to easily and safely select non-internal heating or non-internal drying and internal heating or internal drying by microwave depending on the presence or absence of the frequency selection plate.

Further, the present disclosure is for microwave surface heating or in which the inside of the microwave heating target or the microwave drying target is permeable to the surface of the microwave heating target or the microwave drying target, but cannot penetrate the inside of the microwave heating target or the microwave drying target. It is a frequency selection plate characterized by transmitting electromagnetic waves having a frequency for microwave surface drying.

According to this configuration, it is possible to easily and safely use the frequency selection plate to perform surface heating or surface drying by microwaves without performing internal heating or internal drying by microwaves.

Further, the present disclosure is a frequency selection plate, which is designed at a frequency for heating the microwave surface or drying the microwave surface.

The frequency for surface heating or surface drying is generally higher than the frequency for internal heating or internal drying. According to this configuration, the frequency selection plate can be used even when the non-internal heating target or the non-internal drying target and the surface heating target or the surface drying target are small.

Further, the present disclosure is a frequency selection plate characterized in that a plurality of element patterns having a fractal shape are provided in a grid pattern.

The size of the element pattern having a fractal shape is smaller than the size of the element pattern having no fractal shape according to the number of layers of fractals. According to this configuration, the frequency selection plate can be used even when the non-internal heating target or the non-internal drying target is small.

Further, the present disclosure comprises an element pattern formed of a conductive substance, and allows a part of visible light to pass from one side to the other through a gap of the element pattern formed of the conductive substance. It is a frequency selection board characterized by.

According to this configuration, even when the non-internal heating target or the non-internal drying target is covered with the frequency selection plate, the non-internal heating target or the non-internal drying target can be visually recognized. Since a conductive substance is used, the heat loss power of the frequency selection plate can be reduced.

Further, the present disclosure is characterized by comprising an element pattern formed of a transparent conductive substance, and transmitting visible light from one side to the other side through the element pattern formed of the transparent conductive substance. It is a frequency selection board to be used.

According to this configuration, even when the non-internal heating target or the non-internal drying target is covered with the frequency selection plate, the non-internal heating target or the non-internal drying target can be visually recognized. Since a transparent conductive substance is used, the transparency of the frequency selection plate can be improved.

Further, the present disclosure is a frequency selection plate characterized by being printed on a member having a frequency for microwave internal heating or microwave internal drying and which does not absorb electromagnetic waves.

According to this configuration, the frequency selection plate can be easily manufactured.

Further, the present disclosure comprises the above-mentioned frequency selection plate, which is a container for heating a microwave oven, characterized in that the frequency selection plate is arranged at a position covering the contents when viewed from the electromagnetic wave generator of the microwave oven. be.

According to this configuration, it is possible to easily and safely select non-internal heating or non-internal drying and internal heating or internal drying by microwave depending on the presence or absence of the frequency selection plate.

Thus, the present disclosure can easily and safely select between non-heated or non-dried and heated or dried by microwave.

It is a figure which shows the structure of the microwave oven heating container of this disclosure. It is a figure which shows the covering method of the frequency selection plate of this disclosure. It is a figure which shows the structure of the frequency selection board of this disclosure. It is a figure which shows the structure of the frequency selection board of this disclosure. It is a figure which shows the transmission coefficient and the reflection coefficient of the frequency selection plate of this disclosure. It is a figure which shows the transparency method of the frequency selection board of this disclosure. It is a figure which shows the current distribution of the frequency selection plate of this disclosure. It is a figure which shows the heat loss power of the frequency selection plate of this disclosure.

Embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below are examples of the embodiments of the present disclosure, and the present disclosure is not limited to the following embodiments.

The configuration of the microwave oven heating container of the present disclosure is shown in FIG. The frequency selection plate 1 covers the contents 4 in the container 3 with the lid 2 mounted on the container 3. The frequency selection plate 1 is arranged at a position that covers the contents 4 in the container 3 when viewed from the electromagnetic wave generator of the microwave oven.

The covering method of the frequency selection plate of the present disclosure is shown in FIG. The frequency selection plate 1 covers the contents 4 in the container 3 with the lid 2 removed from the container 3. The frequency selection plate 1 is arranged at a position that covers the contents 4 in the container 3 when viewed from the electromagnetic wave generator of the microwave oven.

The frequency selection plate 1 covering the non-heated food has a frequency of 2.45 GHz for internal heating so as to be able to penetrate the surface of the non-heated food and also penetrate the inside of the non-heated food. Block electromagnetic waves. The frequency selection plate 1 for covering the non-heated food has a frequency for surface heating such that it can penetrate the surface of the non-heated food but cannot penetrate the inside of the non-heated food. Electromagnetic waves having 8 GHz may be blocked.

The frequency selection plate 1 that covers the food to be surface-heated has a frequency of 2.45 GHz for internal heating so as to be able to permeate the surface of the food to be surface-heated and to penetrate the inside of the food to be surface-heated. Block electromagnetic waves. The frequency selection plate 1 that covers the food to be surface-heated can penetrate the surface of the food to be surface-heated, but cannot penetrate the inside of the food to be surface-heated. Blocks electromagnetic waves with 8 GHz.

Here, "electromagnetic waves having a frequency for internal heating can permeate the inside of food" means "electromagnetic waves having a frequency for internal heating can permeate from the surface of food to a depth on the order of, for example, 1 cm". It means "is." On the other hand, "electromagnetic waves having a frequency for surface heating can permeate the surface of food" means "electromagnetic waves having a frequency for surface heating can permeate from the surface of food to a depth on the order of, for example, 1 mm". It means "is."

Then, these frequency selection plates 1 absorb electromagnetic waves having a frequency of 2.45 GHz for internal heating (the frequency selection plate 1 covering the food to be surface-heated also absorbs electromagnetic waves having a frequency of 5.8 GHz for surface heating). It is printed on a member that does not (for example, plastic film 1'). Therefore, these frequency selection plates 1 can be easily manufactured.

It is not necessary to cover these frequency selection plates 1 for the food to be heated internally. Examples of the non-heated food include potato salad and dried plums shown in FIG. Examples of foods subject to surface heating include roast beef (not shown in FIG. 6). Examples of the food to be internally heated include rice, simmered food, pork cutlet and the like shown in FIG.

As described above, non-internal heating and internal heating can be easily and safely selected depending on whether or not these frequency selection plates 1 are used. Then, using these frequency selection plates 1, surface heating can be easily and safely performed without internal heating.

The configuration of the frequency selection plate of the present disclosure is shown in FIGS. 3 and 4.

In FIG. 3, the frequency selection plate 1 is designed at a frequency of 2.45 GHz for internal heating. In the left column of FIG. 3, the frequency selection plate 1 is provided with five conductor patterns having a cross pattern in a grid pattern in the left-right direction of the paper surface and the vertical direction of the paper surface. The conductor pattern having each cross pattern has a size of about half wavelength 58.2 mm of the electromagnetic wave of 2.45 GHz, and the frequency selection plate 1 has a size of 58.2 mm × 5 = 291 mm.

In the middle column of FIG. 3, the frequency selection plate 1 is provided with five conductor patterns having a fractal shape of a hill belt pattern in a grid pattern in the left-right direction of the paper surface and the vertical direction of the paper surface. The conductor pattern having the fractal shape of each Hilbelt pattern has a size of 22.4 mm smaller than 58.2 mm, and the frequency selection plate 1 has a size of 22.4 mm × 5 = 112 mm. In this way, the frequency selection plate 1 can be miniaturized.

In the right column of FIG. 3, the frequency selection plate 1 is provided with five conductor patterns having a fractal shape that is rotationally symmetric four times in a grid pattern in the left-right direction of the paper surface and the vertical direction of the paper surface. As a method of forming a fractal shape having four-fold rotational symmetry, for example, the first four-branch slot is extended four-fold rotationally symmetricly from the vicinity of the apex of the central square slot, and four times from the vicinity of the root of each first branch slot. Each of the second branch slots is extended in a rotationally symmetric manner, and the entire square is filled with the four branch slots of the first to n (n = 6 in FIG. 3). The conductor pattern with each four-fold rotationally symmetric fractal shape has a size of 18.4 mm, which is smaller than 58.2 mm, and the frequency selection plate 1 has a size of 91.2 mm. In this way, the polarization dependence of the frequency selection plate 1 can be eliminated.

In FIG. 4, the frequency selection plate 1 is designed at a frequency of 5.8 GHz for surface heating. In the left column of FIG. 4, the frequency selection plate 1 is provided with five slot patterns having a cross pattern in a grid pattern in the left-right direction of the paper surface and the vertical direction of the paper surface. The slot pattern having each cross pattern has a size of about half a wavelength of 24.6 mm of an electromagnetic wave of 5.8 GHz, and the frequency selection plate 1 has a size of 24.6 mm × 5 = 123 mm.

In the middle column of FIG. 4, the frequency selection plate 1 is provided with five slot patterns having a fractal shape of a hill belt pattern in a grid pattern in the horizontal direction of the paper surface and the vertical direction of the paper surface. The slot pattern with the fractal shape of each Hilbelt pattern has a size of 9.5 mm, which is smaller than 24.6 mm, and the frequency selection plate 1 has a size of 47 mm. In this way, the frequency selection plate 1 can be miniaturized.

In the right column of FIG. 4, the frequency selection plate 1 is provided with five slot patterns having a fractal shape of four-fold rotational symmetry in a grid pattern in the left-right direction of the paper surface and the vertical direction of the paper surface. As a method of forming a fractal shape having four-fold rotational symmetry, for example, the first four-branch conductor is extended four-fold rotationally symmetricly from the vicinity of the apex of the central square conductor, and four times from the vicinity of the root of each first branch conductor. Each of the second branch conductors is extended in a rotationally symmetric manner, and the entire square is filled with the four-branch conductors of the first to n (n = 6 in FIG. 4). Each slot pattern with a four-fold rotationally symmetric fractal shape has a size of 7.8 mm, which is smaller than 24.6 mm, and the frequency selection plate 1 has a size of 7.8 mm × 5 = 39 mm. In this way, the polarization dependence of the frequency selection plate 1 can be eliminated.

As described above, the frequency for surface heating (for example, 5.8 GHz) is generally higher than the frequency for internal heating (for example, 2.45 GHz). Therefore, by designing the frequency selection plate 1 at the frequency for surface heating, the frequency selection plate 1 is used even when the non-internal heating target or the non-internal drying target and the surface heating target or the surface drying target are small. be able to.

The size of the element pattern having a fractal shape is smaller than the size of the element pattern having no fractal shape according to the number of layers of fractals. Therefore, the frequency selection plate 1 can be used even when the non-internal heating target or the non-internal drying target is small.

The transmission coefficient and the reflection coefficient of the frequency selection plate of the present disclosure are shown in FIG.

In FIG. 5, the frequency selection plate 1 is designed at a frequency of 2.45 GHz for internal heating, and has five conductor patterns having a fractal shape of four-fold rotational symmetry in a grid pattern in the left-right direction of the paper surface and the top-down direction of the paper surface. Be prepared. That is, each conductor pattern having a four-fold rotationally symmetric fractal shape has a size of 18.4 mm, as shown in the right column of FIG. Then, at a frequency of 2.45 GHz for internal heating, the transmission coefficient of the frequency selection plate 1 became a minimum value, and the reflection coefficient of the frequency selection plate 1 became a maximum value. Then, at a frequency of 5.8 GHz for surface heating, the transmission coefficient of the frequency selection plate 1 became a sufficiently large value, and the reflection coefficient of the frequency selection plate 1 became a sufficiently small value.

If the conductor pattern having each four-fold rotationally symmetric fractal shape is designed to have a slightly different size instead of designing to a size of 18.4 mm, the frequency is selected at the internal heating frequency of 2.45 GHz. The transmission coefficient of the plate 1 can be set to a value slightly larger than the minimum value, and the reflection coefficient of the frequency selection plate 1 can be set to a value slightly smaller than the maximum value.

FIG. 6 shows a method for making the frequency selection plate of the present disclosure transparent. Even when the non-internal heating target is covered with the frequency selection plate 1, it is desirable that the non-internal heating target can be visually recognized.

Therefore, the frequency selection plate 1 is provided with an element pattern formed of a conductive substance, and a part of visible light is passed from one side to the other side through a gap of the element pattern formed of the conductive substance. .. Here, in order to allow a part of visible light to pass through, the line width of the conductive substance is sufficiently narrowed, and the distance between the conductive substances is sufficiently widened. Alternatively, the frequency selection plate 1 includes an element pattern formed of a transparent conductive substance, and transmits visible light from one side to the other through the element pattern formed of the transparent conductive substance. Here, examples of the transparent conductive substance include indium tin oxide and a conductive polymer substance.

However, it is desirable that the heat loss power of the frequency selection plate 1 does not become too large even when the line width of the conductive substance is sufficiently narrowed, and there is no risk of the frequency selection plate 1, the lid 2 and the container 3 being burnt. Is desirable. 7 and 8 are used to show that there is no such fear.

The current distribution and heat loss power of the frequency selection plate of the present disclosure are shown in FIGS. 7 and 8. Here, the frequency selection plate 1 is designed at a frequency of 2.45 GHz for internal heating, and has five conductor patterns having a fractal shape of four-fold rotational symmetry in a grid pattern in the horizontal direction of the paper surface and the vertical direction of the paper surface. Prepare 10 each. Then, a spherical wave-shaped electromagnetic wave having a frequency of 2.45 GHz and a power of 500 W is irradiated from 30 cm above the frequency selection plate 1.

As shown in FIG. 7, when the direction of the polarization of the electromagnetic wave is parallel to the short side direction of the frequency selection plate 1, the current distribution in the frequency selection plate 1 is from about 0 mA to about 100 mA. As shown in FIG. 8, even when the current distribution in the frequency selection plate 1 is the maximum of about 100 mA, the heat loss power in the frequency selection plate 1 is with respect to the diameters of the conductive materials of 0.1 mm and 0.2 mm. , About 0.4 mW and about 0.1 mW, respectively.

That is, even when the line width of the conductive substance is sufficiently narrowed, the heat loss power of the frequency selection plate 1 does not become so large, and there is no possibility that the frequency selection plate 1, the lid portion 2, and the container 3 are burnt.

In this way, even when the non-internal heating target is covered with the frequency selection plate 1, the non-internal heating target can be visually recognized. Further, even when the line width of the conductive substance is sufficiently narrowed, the heat loss power of the frequency selection plate 1 can be reduced. On the other hand, when a transparent conductive substance is used, the transparency of the frequency selection plate 1 can be improved.

It should be noted that, by generalizing FIGS. 1 to 8, the frequency selection plate 1 can permeate the surface of the non-heated object or the non-dried object and can penetrate the inside of the non-heated object or the non-dried object. In addition, electromagnetic waves having an arbitrary frequency for internal heating or internal drying may be blocked.

Further, by generalizing FIGS. 1 to 8, the frequency selection plate 1 can penetrate the surface of the object to be heated or dried, but cannot penetrate the inside of the object to be heated or dried. Electromagnetic waves having any frequency for heating or surface drying may be transmitted.

Using the frequency selection plate and microwave oven heating container of the present disclosure, it is possible to easily and safely select between non-heating or non-drying by microwave and heating or drying.

1: Frequency selection plate 1': Plastic film 2: Cover 3: Container 4: Contents

Claims (7)

For microwave surface heating or microwave surface drying such that it can penetrate the surface of the microwave heating target or microwave drying target, but cannot penetrate the inside of the microwave heating target or microwave drying target. It transmits electromagnetic waves with frequency and
For microwave internal heating or inside microwaves that can penetrate the surface of a microwave non-heated object or microwave non-drying object and can penetrate the inside of a microwave non-heated object or microwave non-drying object. Blocks microwaves with drying frequencies
A frequency selection board characterized by that. The frequency selection plate according to claim 1 , wherein the frequency is designed at a frequency for heating the microwave surface or drying the microwave surface. The frequency selection plate according to claim 1 or 2 , wherein a plurality of element patterns having a fractal shape are provided in a grid pattern. A claim comprising an element pattern formed of a conductive substance, wherein a part of visible light is passed from one side to the other through a gap of the element pattern formed by the conductive substance. Item 4. The frequency selection plate according to any one of Items 1 to 3 . From claim 1, wherein the device pattern is provided with a transparent conductive substance, and visible light is transmitted from one side to the other through the device pattern formed by the transparent conductive substance. The frequency selection plate according to any one of 3 . The frequency selection plate according to any one of claims 1 to 5 , wherein the printing is performed on a member having a frequency for heating the microwave surface or drying the microwave surface, which does not absorb electromagnetic waves. The frequency selection plate according to any one of claims 1 to 6 is provided, and the frequency selection plate is arranged at a position covering the contents when viewed from the electromagnetic wave generator of the microwave oven. Container for.

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