JPS60174427A - Heating and cooking unit with weight sensing function - Google Patents

Abstract

PURPOSE:To improve a utility convenience of use and a finished outer appearance of a heating and cooking unit by a method wherein a weight of food placed on a heating table is taken out of a heating chamber as a magnetic signal, and an output of heating, a heating time and a heating manner are automatically controlled in reference to the magnetic signal. CONSTITUTION:A part connected to an upper table 8a with a leaf spring 12 being interfaced thereto is vibrated under the number of vibration corresponding to a weight of food 7. Since a magnet 24 is vibrated in response to the number of vibration, a strength of magnetic field is varied at a sensing coil 25 and an electromotive force is generated in the sensing coil 25. This electromotive force is taken out of the heating chamber through an amplifier circuit, filter circuit and wave regulating circuit not shown, fed to a microcomputer, processed in accordance with the desired program and a heating temperature, while time and cooking manner are determined and controlled. With this arrangement, it is made possible to make a utility convenience of use of the unit and improve an outer appearance.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention measures the weight of the object to be heated and automatically controls the heating time, heating temperature, heating output, heating pattern, etc. according to the weight. This invention relates to a cooking device that enables cooking.

Conventional configuration and its problems In conventional conventional cooking devices, the weight of the food to be heated is measured using a scale, and based on that weight, the heating time and heating output are set using a rotary timer or output setting key. I was setting it by .

Therefore, it is necessary to perform cumbersome operations, especially at the start of cooking, such as setting flM, temperature setting, and heating output, and it has been desired to improve usability.

Furthermore, in recent years, they have been equipped with infrared sensors that detect the surface temperature of food, as well as humidity and gas sensors that detect water vapor and alcohol generated from food, to detect the heating state and doneness of food and automatically cook the food. Automatic cooking devices have been developed. However, in these automatic cookers, the sensor mainly detects the heating state of the surface of the food. Therefore, the heating condition differs depending on the weight of the food, and especially in large foods, there is a large difference in /fiiR degree between the center and the surface, resulting in a difference in the finished product.

Therefore, it is necessary to improve these problems, and for this purpose, it has been desired to automatically measure the weight of food in the cooking device itself.

Purpose of the Invention The present invention solves the above-mentioned conventional problems.It automatically measures the weight of food and automatically controls heating output, heating time, heating style, etc., making it easy to use and improving the quality of cooking. The purpose is to detect accurate vibration frequencies.

Structure of the Invention In order to achieve the above object, the cooking device with a weight detection function of the present invention includes a heating chamber for storing food, a heat source for heating the food in the heating chamber, and a heat source for heating the food in the heating chamber. The device is equipped with a stand for the object to be heated having a variable number of springs, and is configured to magnetically transmit the vibrations to the outside of the heating chamber. Furthermore, a rotation drive unit is provided which enables the table for placing the object to be heated to rotate and rotationally drives the table for placing the object to be heated.

The vibration of the object to be heated which is transmitted to the outside of the heating chamber by the magnetism is detected, the weight of the food as the object to be heated is calculated from the frequency of the vibration, and the weight of the food as the object to be heated is calculated from the calculated M amount of the food. The structure includes a circuit that controls the output of the heat source, and when setting the heating output, heating style, and heating time, the user does not need to weigh the food, making it possible to create an easy-to-use cooker. It is. Furthermore, by combining it with a sensor that detects the doneness of other foods, it is possible to improve the quality of automatic cooking. Furthermore, in the present invention, since the weight information is transmitted to the outside of the heating chamber by magnetism, the signal can be transmitted without contact. Therefore, it has the advantage of being easy to implement and having a simple structure. In particular, in a microwave oven such as a high-frequency heating cooker, there is no need to make a hole in the heating chamber, so there is no possibility of radio wave leakage.

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

FIG. 1 shows a perspective view of a microwave oven as a cooking device. In the figure, 1 is the heating time and heating time of the food as the object to be heated.
A display section for displaying heating output, etc., 2d, and an operation input section for selecting the type of cooking, heating output, and setting the heating time. 3 is a door that can be opened and closed for taking food in and out of the heating chamber 5, and 4 is a main body.

FIG. 2 is a cross-sectional view of the microwave oven. In the figure, 6 is a magnetron for supplying high frequency energy to the heating chamber 5, and 7 is food as an object to be heated. Reference numeral 8 denotes a turntable as a stand for placing the food 7, which is rotatable and is constructed of a spring whose vibration frequency changes depending on the movement of the food 7. 9 is a turntable motor for rotating and driving this turntable, which transmits the vibration of the turntable 8 to the outside of the heating chamber 5 by magnetism, and a detection coil 10 is provided to detect the magnetic signal. There is. 12 indicates a rotation axis. 13 is a plate serving as a container for the food 7; 14 is a pulley for transmitting the rotational force of the turntable motor 9 to the turntable 8 via the belt 16.

FIG. 3 shows the structure of the turntable 8 and the frequency transmission and detection section. The structure of the turn chill pull 8 consists of two upper and lower tables, that is, an upper table 8a and a lower table 8b, and these two chill pulls are connected via two leaf springs 16. two leaf springs 16
With the spring spacer 18 in between, the spring holding metal fitting 19 and the earth table holder are the metal fittings 20. The lower table support is sandwiched between metal fittings 21 and fixed with bolts 22. The metal fitting 20 of the upper table support is connected to the soil table 5aVC, and the metal fitting 21 of the lower table support is connected to the lower table 8b by spot welding or the like. The upper table is supported by the lower table 8bio-723 and is rotatable. The center of the lower table 8b is the rotation axis 1
2, and the rotational force transmitted to the pulley 14 is further transmitted to the turntable 8.

With the above configuration, the upper table 8
The part connected to a vibrates. This frequency changes depending on the weight of the food 7.

That is, if the food 7 becomes heavier, the frequency of vibration becomes smaller, and if the food 7 becomes lighter, the frequency of vibration becomes larger. Furthermore, magnetism is used as a means for transmitting the frequency as weight information to the outside of the heating chamber 6. That is, a magnet 24 is provided at a location connected to the vibrating upper table 8a, and a detection coil 26 detects the magnetic signal. At this time, on the yoke and the lower table 8
A magnetic circuit is formed with the protrusion 8C of b. That is, as the magnet 24 vibrates, its positional relationship with the detection coil 26 changes. When the positional relationship changes, the magnetic field strength in the detection coil 25 changes, and an electromotive force is generated in the detection coil 26 in response to the change in the magnetic field strength. Then, this 7B signal may be processed by an electronic circuit.

FIG. 4 is an exploded perspective view showing the structure of the turntable 8 shown in FIG. 3.

FIG. 6 shows an example of an electronic circuit that processes the electrical signal converted by the detection coil 25. That is, the turntable 8 vibrates and the magnet 24 also vibrates. This changes the distance between the magnet 24 and the detection coil 26, so
An electromotive force is generated in the detection coil 26. This electromotive force signal is small and is influenced by other radio waves and power supply noise. Therefore, the signal is first amplified by the amplifier circuit 26. Furthermore, a filter circuit 27 is used to remove the influence of radio waves and power supply noise. The frequency due to this vibration is 1~
The frequency is low, around 100Hz, and the radio waves are IKHz.
The above is common. Therefore, in this case, it is desirable to use a low-pass filter. Now, the output that has passed through this filter circuit 27 is further shaped into a square wave by a waveform shaping circuit 28. Then, this signal can be processed by the microcomputer 3°.

FIG. 6 explains the reason why the filter circuit 27 is required. The illustrated waveforms are an input waveform (upper side) and an output waveform (lower side) of the waveform shaping circuit. FIG. 1A shows a case where there is no filter circuit 27, and if the signal is influenced by radio waves, the output from the waveform shaping circuit 28 becomes unstable, making it difficult to process the signal. On the other hand, the opening in the figure is filter circuit 2.
7 to remove the influence of radio waves, the output waveform is also stable, and processing is possible.

FIG. 7 shows an example of a control circuit for a cooking appliance with a weight detection function. 31 is an oscillation circuit for obtaining a reference time.

So, the microcomputer memorized 9 judgments, '$, N.

It has functions such as data input and control output.

As described above, according to this embodiment, only the signal from the turntable 8 can be extracted, and other unnecessary shoe sounds can be removed. And the weight of food can be measured accurately.

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

(1) The weight of food can be easily measured by detecting the vibration of the turntable.

@) Signals can be transmitted to the outside of the heating chamber without contact.

(3) Only the vibration signal of the turntable can be extracted,
Since other noise is removed, the signal is easier to process.

(4) Accurate measurement is possible because noise is removed.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a microwave oven that is an embodiment of the present invention, Fig. 2 is a side sectional view of the same microwave oven, Fig. 3 is a sectional view of the structure of the turntable, vibration transmission and detection section, Figure 4 is an exploded perspective view of the same turntable, Figure 6 is an electronic circuit diagram for detecting vibrations and a waveform shaping circuit, and Figure 6 A is a characteristic diagram showing the output waveform of the waveform shaping circuit with and without a filter circuit. , FIG. 7 is a circuit diagram of a microwave oven which is an embodiment of the present invention. 1...Display section, 2...Operation input section, 3
...Door-14...Main body, 5...
... Heating chamber, 6... Magnetron, 7...
・・Food, 8・・Table for heating objects (turntable), 8a・・Top table, 8b・・・・
Lower table, 9...Turntable motor,
10...Detection coil, 12...Rotation axis, 13
...Plate, 14...Pulley, 16...
...belt, 16...plate spring, K...yoke,
18... Spring spacer, 19... Spring holding fitting, 20... Upper table holder is metal fitting, 21...
・ ・ ・ ・ ・ The lower table receives are brackets, 22 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 26
...Amplification circuit, 27 ...Filter circuit, 28 ... Waveform shaping circuit, 30 ... Microcomputer, 31 ... Reference clock oscillator. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure B Figure 2 〇 Sha Figure 4 Figure 6 1 hour - B Togama

Claims (2)

[Claims] (1) A heating chamber that stores an object to be heated, a heat source for heating the object to be heated in the heating chamber, and a heating chamber in which the object to be heated is placed and whose frequency changes depending on the weight of the object to be heated. The weight of the heated object is calculated by detecting the vibration frequency of the heated object mounting table having a vibration generator and the vibration frequency of the heated object mounting stand, and the calculated weight of the heated object]: a circuit for controlling the output, heating style, and heating time of the heat source; a means for transmitting the vibration frequency of the stand for the object to be heated to the outside of the heating chamber in the form of a magnetic signal; a magnetic detection unit that detects a magnetic signal generated by the heating device and converts it into an electrical signal; and a filter circuit that blocks frequencies unrelated to the number of images of the heating target in the electrical signal converted by the magnetic detection unit. Heavy load detection function + J cooker. (2) The heat cooker with a weight detection function according to claim 1, wherein the output that has passed through the filter circuit is further shaped into a square wave by a waveform shaping circuit.