JPH0749284Y2 - microwave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a microwave oven for heating and cooking an object to be cooked placed on a table in a heating chamber by high-frequency waves emitted from high-frequency heating means. .

[Prior art]

In general, a microwave oven is characterized in that it can be heated and cooked without causing burnt to the object to be cooked.

However, there are some foods such as fish and meat that are preferably accompanied by some charring.

In order to meet these demands, conventionally, a special cooking dish coated with a coating of a high-frequency heating element made of metal oxide or the like has been used.

That is, the dedicated cooking dish is placed on a table in a microwave oven in advance and preheated, and the surface temperature of the dedicated cooking dish is 200 to 300.
When the temperature reaches ℃, the food to be cooked is placed on this special cooking dish and further heated in a microwave oven. In addition to heating by the high frequency from the magnetron (high frequency heating means), The surface of the cooking target is burnt by the heat from the heated cooking dish.

[Problems to be solved by the device]

However, in the above-mentioned conventional microwave oven, when trying to cook while browning the object to be cooked as described above, it is necessary to use a special cooking dish coated with a high-frequency heating element, which is expensive in cost. There was a problem that became.

Therefore, an object of the present invention is to provide a microwave oven having a function capable of heating and cooking while appropriately browning an object to be cooked, without using a dedicated cooking dish.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the main means adopted by the present invention is that the cooking target placed on the table which is supported at the bottom of the heating chamber so as to be detachable from the high-frequency heating means. In a microwave oven that heats and cooks by irradiated high frequency, the table is formed of a metal material, a thin film of a high frequency heating element is formed on the back surface of the table, and the distance between the table and the bottom is variable. Accordingly, the microwave oven according to the present invention comprises a control mechanism for controlling the irradiation degree of the high frequency to the thin film of the high frequency heating element.

[Action]

In the microwave oven according to the present invention, by controlling the distance between the table and the bottom of the heating chamber by the control mechanism, it is possible to control the irradiation degree of high frequency to the thin film of the high frequency heating element formed on the back surface of the table. As a result, the thin film heats the table, and the food to be cooked placed on the table is browned. At the same time, the food to be cooked is heated and cooked by the high frequency waves emitted from the high frequency heating means.

Therefore, in the microwave oven, by using the table for placing the object to be cooked as the conventional dedicated cooking dish, the use of the dedicated cooking dish can be omitted.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiments are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention.

FIG. 1 shows the structure of a table of a microwave oven according to an embodiment of the present invention. FIG. 1 (a) is a plan view, FIG. 1 (b) is a side sectional view, and FIG. Shows a state in which the above table is placed inside a microwave oven. FIG. 1A is a plan view, FIG. 1B and FIG. 1C are side sectional views, and FIG. The structure of the table of the microwave oven which concerns on another Example is shown, The figure (a) is a top view, the figure (b) is a sectional side view, FIG. 4 is the table which concerns on the said other Example. FIG. 3 shows a state in which the device is placed inside a microwave oven. FIG. 5 (a) is a plan view, FIG. 4 (b) and FIG. 4 (c) are side sectional views, and FIG. [Fig. 6] Fig. 6 shows a structure of a table of a microwave oven according to still another embodiment, in which Fig. (A) is a plan view, Fig. (B) is a side sectional view, and Fig. 6 (a), ( ) Is a side cross-sectional view of the table according to still another embodiment placed inside a microwave oven, and FIGS. 7 (a) and 7 (b) are the microwave ovens shown in FIG. 6, respectively. FIG. 8 is a perspective view of the components of the present invention, and FIG. 8 shows the structure of a table of a microwave oven according to still another embodiment of the present invention, in which (a) is a plan view and (b) is a side view. Sectional views, FIGS. 9 (a) and 9 (b) are side sectional views in a state where the table according to the above still another embodiment is placed inside a microwave oven, and FIG. 10 is shown in FIG. And FIG. 11 is a plan view, FIG. 11B is a side sectional view, and FIG.
It is a perspective view of the components which comprise the microwave oven shown in the figure.

In the microwave oven according to this embodiment, as shown in FIG.
As shown in (b), the table 1 placed inside the microwave oven is made of a metallic material having a circular shape in plan view, and the microwave absorbing heat generating material 2 (high frequency wave) is formed on the back surface of the table 1. A thin film of a heating element) is formed.

The microwave absorbing exothermic substance 2 is a ferrite powder, for example, having a Curie point of 200 ° C. or higher, good thermal stability,
Manganese and zinc ferato fine particles that do not oxidize and powder with high magnetic permeability are made into a ferrite paint with a ferrite content of 60 to 80% (weight ratio) by using a binder paint such as silicone resin to form a ferrite paint. There is.

The ferrite coating material is formed on the back surface of the table 1 in a thickness of 200 to 300 μm.

As the binder, water glass, ceramics such as silica sol, or an inorganic material may be used instead of the silicon resin.

Continuing, based on FIGS. 2 (a), (b) and (c),
A support structure of the table 1 which constitutes a control mechanism for controlling the irradiation degree of the high frequency to the microwave absorbing heat generating material 2 will be described.

That is, the bottom of the microwave oven main body 1 has an annular step portion 3a, 3b,
3c is formed, and a coupling 5 rotatably driven by a motor 4 is arranged in the approximate center thereof. A roller stay 6 is connected to the coupling 5, and a roller 7 is rotatably provided on the roller stay 6. Further, the roller 7 is movable in the axial direction of the roller stay 6 and can roll on the steps 3b and 3c.

The table 1 is placed on the roller 7.

When the coupling 5 is driven to rotate by the motor 4, the table 1 is rotated and the object placed on the table 1 is radiated by a high frequency emitted from a magnetron (high frequency heating means, not shown). The food is cooked uniformly.

More specifically, when the table 1 is placed on the roller 7 when the roller 7 can roll on the step 3c, the table 1 is placed between the outer peripheral bottom surface of the table 1 and the step 3a. Since only a small gap is formed, the high frequency emitted from the magnetron is prevented from being absorbed by the microwave absorbing heat generating material 2 on the back side of the table 1. As a result, when the table 1 is rotated, the table 1 does not generate heat and the cooked object placed on the table 1 is cooked only by the high frequency waves from the magnetron.

On the other hand, when the table 1 is placed on the roller 7 in a state in which the roller 7 can roll on the step 3b, a large opening is formed between the outer peripheral bottom surface of the table 1 and the step 3a. The high frequency waves from the magnetron directly irradiate the microwave absorbing heat generating material 2 through this opening.

As a result, the table 1 itself generates heat, and the table 1
At the same time that the food to be cooked placed thereon is browned, the food to be cooked is also heated and cooked by the high frequency wave directly radiated from the magnetron.

By changing the support height of the table 1 with the above structure,
By controlling the degree of irradiation of the microwave absorbing heat-generating substance 2 of high frequency, there is no need to use a special cooking dish as in the case of the conventional device, and cooking is performed with browning of the object to be cooked. It can be selectively used depending on whether it is cooked only by heating.

As shown in FIG. 3, a table 8 according to another embodiment shown in FIG. 3 is formed of a metal material having a rectangular shape in a plan view, and a thin film of the microwave absorbing heat generating substance 9 is formed on the back surface side thereof. Has been formed.

The table 8 is used in a stationary state in the microwave oven without being rotated, and an example of the supporting structure thereof will be described with reference to FIGS. 4 (a), (b) and (c).

That is, for example, step portions 10a and 10b in a substantially ring shape are formed on the bottom surface of the cooking chamber of the microwave oven.

Then, by placing the outer peripheral bottom surface of the table 8 on the step portion 10a, irradiation of the microwave absorption heat generating substance 9 from the magnetron is blocked, and the table 8 is placed on the table 8. The food to be cooked is cooked only by the high frequency waves from the magnetron.

On the other hand, by interposing the support base 11 between the outer peripheral bottom surface of the table 8 and the step portion 10a, a large opening is formed between the outer peripheral bottom surface of the table 8 and the step portion 10a,
The high frequency wave from the magnetron is directly applied to the microwave absorbing heat generating material 9 through this opening.

As a result, the food to be cooked placed on the table 8 is
When the table 8 generates heat, the table 8 is browned, and the table 8 is cooked by being directly irradiated with the high frequency wave from the magnetron.

A table 12 according to still another embodiment shown in FIGS. 5 (a) and 5 (b) is made of a metallic material having a circular shape in a plan view, and has a microwave absorbing heat generating substance 13 on its back surface. A thin film is formed.

Further, on the back surface side of the table 12, an annular support leg 12 is formed.
a is projected.

Subsequently, the support structure of the table 12 will be described with reference to FIGS. 6 (a) and 6 (b).

That is, at the center of the bottom of the cooking chamber of the microwave oven, the motor 4
A plate 14 (see FIG. 7A) is slidably fitted in the output shaft 4a of the motor 4 in the vertical direction. A key groove is formed in the plate 14 and is connected to the output shaft 4a through a key material (not shown). Further, since the table 12 is placed on the upper surface of the plate 14, a plurality of openings 14a are appropriately formed so that the microwave absorbing heat generating substance 13 on the bottom surface side of the table 12 can be irradiated with high frequency. Has been done.

Further, a stopper 15 (see FIG. 7 (b)) is loosely fitted on the base side of the output shaft 4a so as to be slidable in the vertical direction.
The upper surface of the stopper 15 is in contact with the lower end of the plate 14. Furthermore, the outer peripheral surface of an eccentric cam 16 which is rotationally driven by a motor (not shown) is in contact with the lower surface side of the stopper 15.

Therefore, in the support structure according to the above configuration, the table 4 is rotated by rotationally driving the motor 4, and the cooking target placed on the table 12 is heated and cooked. .

In this case, when the eccentric cam 16 is in the state shown in FIG. 6 (a), the table 12 is moved down and the table 12 is moved.
The supporting legs 12a of the above block the irradiation of the microwave absorbing heat generating material 13 with a high frequency.

As a result, the food to be cooked placed on the table 12 is
It is cooked only by the high frequency waves from the magnetron.

On the other hand, when the eccentric cam 16 is in the state shown in FIG. 6 (b), the table 12 is moved upward and the support leg 12 is moved.
The microwave absorbing heat generating material 13 is allowed to be irradiated with a high frequency from below a.

As a result, the food to be cooked placed on the table 12 is
When the table 12 itself generates heat, it is browned, and at the same time, it is cooked by the high frequency waves directly emitted from the magnetron.

Next, the table 17 according to still another embodiment will be described with reference to FIGS. 8 (a) and 8 (b).

The table 17 according to this embodiment has substantially the same basic structure as the table 12 shown in FIG. 5, and the difference from the table 12 is that the motor 4 (see FIG. The bearing 17a into which the output shaft 4a is inserted is fixed by, for example, spot welding.

In the table 17 as described above, as shown in FIGS. 9 (a) and 9 (b), the bearing 17a is fitted into the upper end of the output shaft 4a protruding from the center of the bottom surface of the cooking chamber to rotate. It is supported freely. Further, the motor 4 is mounted on a motor mounting angle 19 which is slidably supported by a guide angle 18 in the vertical direction. And
Similar to the structure shown in FIG. 6, the motor mounting angle 19 is an eccentric cam 16 rotatably driven by a motor (not shown).
It is supported by.

Therefore, in the support structure according to the above structure, the eccentric cam
When 16 is in the state of FIG. 9 (a), the support leg 12a of the table 17 prevents the microwave absorbing heat generating material 13 from being irradiated with high frequency, and the food to be cooked placed on the table 17 is , Cooked only by the high frequency emitted from the magnetron.

On the other hand, when the eccentric cam 16 is in a state of being rotated by 90 degrees as shown in FIG. 9 (b), the intrusion of high frequency waves from the magnetron is allowed through the opening formed below the support leg 12a. The food to be cooked placed on the table 17 is browned due to the heat generated in the table 17 itself, and is also cooked by the high frequency wave directly emitted from the magnetron.

10 (a) and 10 (b) show another example of the supporting structure of the table 1 (see FIGS. 1 (a) and 1 (b)).

That is, as shown in the figure, in this support structure, the roller 7 is rotationally driven only on the bottom surface having the same height.

The roller 7 is the roller stay 6 and the coupling 5.
The object to be cooked placed on the table 1 is cooked by being rotationally driven by the motor 4 via the.

In this case, by placing a cylindrical ring 20 (see FIG. 11) on the lower surface side of the outer peripheral surface of the table 1, it is possible to prevent the high frequency microwave radiated from the magnetron from entering the microwave absorbing heat generating material 2. The food to be cooked placed on the table 1 is heated and cooked only by the high frequency waves emitted from the magnetron.

On the other hand, by removing the ring 20, the microwave absorbing heat-generating substance 2 can be irradiated with the high-frequency wave, and the food to be cooked placed on the table 1 is heated by the table 1 and is burnt. While being cooked, it is cooked by the high frequency wave directly radiated from the magnetron.

Therefore, as described in detail in each of the above-mentioned embodiments, while applying the microwave absorbing heat generating material to the back surface side of the table,
By controlling the degree of high-frequency irradiation of this microwave absorbing heat-generating substance, it is possible to perform cooking with browning or simply high-frequency heating without using a special cooking dish as in the conventional case. It can be selectively performed as appropriate.

In the present embodiment, the degree of irradiation of the high-frequency microwave absorbing heat-generating substance is appropriately changed stepwise between the state in which it can be blocked and the state in which it can be permitted, and the heating degree of the table is controlled. Is also good.

[Effect of device]

As described above, the present invention provides a microwave oven for heating and cooking an object to be cooked, which is placed on a table that is detachably attached to the bottom of the heating chamber, by the high frequency emitted from the high frequency heating means. Is formed of a metal material, a thin film of a high frequency heating element is formed on the back surface of the table, and the distance between the table and the bottom is made variable to irradiate the thin film of the high frequency heating element with the high frequency. Since the microwave oven is characterized by having a control mechanism for controlling the degree, it is possible to appropriately brown the food to be cooked on the same table without using a special cooking dish unlike the conventional device. A microwave oven that can be cooked while being attached can be provided at low cost.

[Brief description of drawings]

FIG. 1 shows a structure of a table of a microwave oven according to an embodiment of the present invention. FIG. 1 (a) is a plan view, FIG. 1 (b) is a side sectional view, and FIG. 2 is the table. FIG. 2A shows a state in which is placed inside a microwave oven, and FIG.
Is a plan view, FIG. 3B and FIG. 3C are side sectional views, and FIG. 3 shows the structure of a microwave oven table according to another embodiment. A plan view, FIG. 4B is a side sectional view, and FIG. 4 shows a state in which a table according to another embodiment is placed inside a microwave oven. FIG. , The same figure (b) and the same figure (c)
FIG. 5 is a side sectional view, FIG. 5 shows a structure of a table of a microwave oven according to still another embodiment of the present invention, where FIG. 5A is a plan view and FIG. Figure, 6th
FIGS. 7 (a) and 7 (b) are side cross-sectional views of the table according to still another embodiment placed inside a microwave oven, and FIGS. 7 (a) and 7 (b) are respectively FIG. FIG. 8 is a perspective view of components constituting the microwave oven shown in FIG. 8, FIG. 8 shows a structure of a microwave oven table according to still another embodiment of the present invention, and FIG. FIG. 9B is a side sectional view, and FIGS. 9A and 9B are side sectional views in a state where the table according to the above still another embodiment is placed inside a microwave oven. The figure shows another supporting structure for the table shown in FIG. 1, in which FIG. 11 (a) is a plan view, FIG. 11 (b) is a side sectional view, and FIG. 11 is shown in FIG. It is a perspective view of the components which comprise a microwave oven. [Explanation of symbols] 1,8,12,17 …… Table 2,9,13 …… Microwave absorption heating material (high frequency heating element) 3a, 3b, 3c …… Step 4, …… Motor, 4a …… Output shaft 5 ... Coupling, 6 ... Roller stay 7 ... Roller, 10a, 10b ... Step 11 ... Support base, 12a ... Support leg 14 ... Plate, 14a ... Opening 15 ... Stopper, 16 …… Eccentric cam 17a …… Bearing, 18 …… Guide angle 19 …… Motor mounting angle 20 …… Ring

Claims (1)

[Scope of utility model registration request] 1. A microwave oven for heating and cooking an object to be cooked, which is placed on a table which is detachably attached to the bottom of a heating chamber, by a high frequency emitted from a high frequency heating means, wherein the table is made of a metal material. And forming a thin film of the high-frequency heating element on the back surface of the table, and by varying the distance between the table and the bottom, the irradiation degree of the high-frequency to the thin film of the high-frequency heating element is controlled. A microwave oven comprising a control mechanism.