JPH0821632A - High-frequency heating appliance - Google Patents

Abstract

PURPOSE:To detect rotation of the food and thereby to prevent failure of cooking. CONSTITUTION:In a high-frequency heating appliance equipped with a heating chamber 1 and a rotary table 2 which is provided inside the heating chamber 1 and on which foodstuff 3 is set, a light-intercepting plate 4 is provided on a part of the rear of the rotary table 2, light sensors 5 are disposed outside the side walls 1a and 1b of the heating chamber 1 and rotation of the rotary table 2 is detected by these light sensors 5. According to this constitution, a state wherein the light from the light sensors 5 is transmitted continuously indicates an abnormal use of the appliance that the user forgets to set the rotary table 2, while a state wherein the light from the photosensors 5 is intercepted by the light-intercepting plate 4 of the rotary table 2 indicates stoppage of the rotary table 2. On detection of these states, oscillation of a microwave is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating device, and more particularly to a rotary table used to uniformly heat food.

[0002]

2. Description of the Related Art Conventionally, in a high-frequency heating apparatus equipped with a weight sensor, not only the difference in the weight of food on the turntable in the heating chamber is measured, but also the presence or absence of the turntable is detected and there is no turntable. In some cases, one that stops the oscillation of microwaves has been developed.

However, those without a weight sensor cannot discriminate the presence or absence of a turntable. If there is no turntable, deterioration of electric parts such as magnetron and high-voltage transformer and local abnormality in the heating chamber. Since it is not possible to prevent heating, cautions are given in the instruction manuals and cooking books.

Further, depending on the size of the food and the position where the food is placed on the turntable regardless of the presence or absence of the weight sensor, when the turntable rotates, the food hits the wall of the heating chamber and the turntable stops rotating uniformly. Since it will not be heated, cautions are given in the instruction manuals and cookbooks.

Furthermore, in the case of a high-frequency heating device with a heater having heaters above and below the heating chamber and a square plate for baking cakes and cookies, the usage of the accessories to be used should be described in the instruction manual or cooking book. I am teaching.

[0006]

However, these cautions and instructions are not always protected by the user,
There was a problem that heating without a turntable caused deterioration of electric parts such as magnetron and high-voltage transformer and local abnormal heating in the heating chamber.

Further, the position of the food placed on the rotary table is poor, and when the rotary table rotates, the food may hit the wall surface of the heating chamber, and the rotation of the rotary table may stop, resulting in uneven heating.

Further, in the case of a high-frequency heating device with a heater, the heater as well as the heater itself is heated when the heater is heated. There was a problem that I could not do it.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is a high frequency heating apparatus having a heating chamber and a rotating table for placing food in the heating chamber. A light-shielding plate is provided on a part of the back surface of the heating device, and a photosensor is provided outside the side wall of the heating chamber, and the photosensor detects that the turntable is rotating.

[0010]

With the above configuration, when the light from the photosensor is continuously transmitted, it is an abnormal use in which the user forgets to put the turntable, and the light from the photosensor is blocked by the light shield plate of the turntable. When it is in the state, the rotary table has stopped, or it is detected that the rotary table is put in the heater with a heater and the rotary table is put in, and the microwave oscillation is stopped.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view of a main part of a high-frequency heating apparatus showing an embodiment of the present invention, and FIG. 2 is a plan view thereof.

In the figure, 1 is a heating chamber. Reference numeral 2 denotes a turntable provided in the heating chamber 1 for placing the food 3 thereon, having a rotary bearing 2a fitted with a rotary shaft 8 of a motor 7, and having an arc-shaped light-shielding plate 4 on a part of its back surface. It is provided. 5 is a position corresponding to each other outside the side walls 1a and 1b of the heating chamber 1.
It is a photo sensor composed of a light emitting diode 5a and a light receiving transistor 5b provided at a height. 6a is a small hole formed in the side wall 1a of the heating chamber 1 at a position facing the light emitting diode 5a, and 6b is a small hole formed in the side wall 1b of the heating chamber 1 at a position facing the light receiving transistor 5b.

As shown in FIG. 2, the light-emitting diode 5a and the light-receiving transistor 5b are arranged such that when the rotary table 2 makes one rotation, light is blocked by the light-shielding plate 4 of the rotary table 2 for 10 to 90 times of one rotation of the rotary table 2. They are arranged so as to face each other so that they are blocked in the range of%.

Next, the operation of this embodiment will be described.

Normally, the rotary table 2 is set on the rotary shaft 8,
When the food 3 is placed on the turntable 2 and an operation button (not shown) is operated, the turntable 2 starts to rotate, and when the turntable 2 makes one revolution, the light from the photosensor 5 is making one revolution by the light shielding plate 4. Since it is shut off in the range of 10 to 90% of the
Is detected and it is detected that the food 3 is normally placed and rotating, and cooking proceeds according to the menu.

However, if the operation button is operated without setting the turntable 2, the light from the photosensor 5 is continuously transmitted during the first one rotation (the time required for the turntable 2 to make one rotation). Detecting that the turntable 2 is not set, the microwave oscillation is automatically stopped.

When the food 3 placed on the turntable 2 hits the side walls 1a, 1b of the heating chamber 1 during the first turn of the turntable 2 and the turntable 2 stops rotating, the photo sensor Since the light from 5 remains blocked by the light shielding plate 4, it is detected that the rotation of the turntable 2 is stopped, and the microwave oscillation is automatically stopped.

Further, in a high-frequency heating device (not shown) with a heater having heaters above and below the heating chamber 1 and having a square plate for baking cakes and kutsky, if the rotary table 2 is set, The light from the sensor 5 is one in one rotation
Since it is cut off in the range of 0 to 90%, it is detected that the rotary table 2 is being used, and the power supply to the heater is stopped.

In the case of the above-mentioned abnormality or misuse, a warning buzzer (not shown) or the like is used to notify,
The usability is further improved.

[0021]

As described above, according to the present invention, in a high-frequency heating apparatus provided with a heating chamber and a turntable on which food is placed, a light-shielding plate is provided on a part of the back surface of the turntable to heat the food. A photo sensor is installed outside the chamber side wall, and this photo sensor is used to detect that the turntable is rotating, so it is used when the light from the photo sensor is continuously transmitted. It is an abnormal use that a person forgot to put in the turntable, and when the light from the photo sensor is blocked by the light shield plate of the turntable, the turntable has stopped, or something with a heater is heating the heater. Despite that, the microwave oscillation is stopped when it is detected that the turntable is in the wrong use and the microwave oscillation is stopped. Therefore, it is possible to prevent cooking failure and provide a high-frequency heating device with improved usability. .

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a main part of a high-frequency heating device showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

[Explanation of symbols]

 1 Heating chamber 2 Rotating table 3 Food 4 Light-shielding plate 5 Photo sensor

Claims (1)

[Claims] 1. A high-frequency heating device comprising a heating chamber (1) and a turntable (2) for placing a food (3) inside the heating chamber (1), wherein one of the backsides of the turntable (2) is provided. A light-shielding plate (4) is provided in the section, and a photosensor (5) is provided outside the side walls (1a) and (1b) of the heating chamber (1). The photosensor (5) rotates the turntable (2). A high-frequency heating device, which is characterized in that it is detected.