JPH089528Y2 - High frequency heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a microwave oven or a microwave oven equipped with a weight sensor that detects the capacitance between two electrodes to detect the weight of a heated object. Related to the improvement of high frequency heating equipment such as
More specifically, the present invention relates to a high-frequency heating device capable of reducing the number of parts constituting the weight sensor and improving the weight detection accuracy of the weight sensor.

[Prior art]

FIG. 2 is a schematic sectional view showing a conventional high-frequency heating device.

At the bottom of the heating chamber 2 of the high-frequency heating device 1, a weight sensor 5 for detecting the weight of the object 4 to be heated placed on the turntable 3 is provided with a shaft 8 and a hole in a bottom plate 6 of the heating chamber 2. It is attached so that it protrudes from 7.

As shown in FIG. 3, a turntable plate 10 that supports the turntable 3 is attached to the upper end of the shaft 8.

The lower end 11 of the shaft 8 is supported by the support member 14 of the weight sensor 5 via the two leaf springs 12, and slides up and down according to the weight applied to the shaft 8. Further, at the lower end portion 11 of the shaft 8, a movable first electrode that is displaced according to the deflection of the leaf spring 12 via an insulating spacer 15.
16 is installed. Furthermore, the support member 14 includes
The second electrode 21 on the fixed side is fixed so as to face the first electrode 16 via an insulating spacer 18 and a screw 20. One ends of lead wires 23 and 24 are connected to the first and second electrodes 16 and 21, respectively, and the other ends of the lead wires 23 and 24 are connected to the first and second electrodes, respectively.
Detection circuit 1 for detecting the capacitance between the second electrodes 16 and 21
9 (FIG. 4) is connected to the formed substrate 22.

When the object 4 to be heated is placed on the turntable 3, the weight of the object 4 pushes down the leaf spring 12 via the shaft 8 and the like. Then, the first and second electrodes 16 and 2 are
As the distance between 1 changes, the capacitance of the capacitor C (FIG. 4) composed of both electrodes changes. The output oscillation frequency of the detection circuit 19 changes according to the change in the capacitance.

Then, the output oscillation frequency is read by the control unit 25, and the weight of the object to be heated 4 is calculated. Then, the heating time is adjusted according to this weight, the microwave generation circuit 27 is drive-controlled through the switch circuit 26, and the heating treatment of the object 4 to be heated is performed.

[Means for solving the problem]

As described above, the weight sensor 5 of the conventional high-frequency heating device 1 is composed of a large number of parts such as the screw 20, the lead wire 24, etc., and the assembly and the like thereof are troublesome.

Further, the weight sensor 5 is a system for detecting the electrostatic capacitance between the first and second electrodes 16 and 21 as described above.
Since the lead wire 24 is routed in an unstable state in the vicinity of the second electrodes 16 and 21, the lead wire 24 and the lead wire 24 are not connected to each other.
A stray capacitance is generated between the first electrode 16 and the first electrode 16, and between the lead wire 24 and the support member 14, and the value of the stray capacitance changes depending on how the lead wire 24 is laid out. There is a problem in that the capacitance value between the two is disturbed, and the accuracy of detecting the weight of the object to be heated 4 deteriorates.

Therefore, the present invention has been made for the purpose of providing a high frequency heating device capable of improving the detection accuracy of the weight sensor by reducing the number of parts of the weight sensor and reducing the influence of the stray capacitance. It is a thing.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention is arranged oppositely,
Two electrodes, one of which is moved in the opposite direction according to the weight of the object to be heated, a substrate on which a detection circuit for detecting the capacitance between the two electrodes is formed, the two electrodes, and the above A high-frequency heating device, comprising: a connection part for connecting to a detection circuit, for performing heating processing of the object to be heated based on a detection signal of the detection circuit, the other electrode of the two electrodes, and the other electrode. The high frequency heating device is characterized in that the electrode and the connection portion for connecting the detection circuit are formed on the substrate.

[Action]

In this high-frequency heating device, the other electrode of the two electrodes (corresponding to the second electrode 21 in FIG. 3) and the connecting portion that connects the other electrode and the detection circuit are formed on the substrate in a pattern, for example. Since it is formed, the above connecting part is connected to the connecting wire of another part,
Since it is not necessary to form the insulating spacers and screws, these components can be reduced.

In addition, since the connection line of the separate component is eliminated, the stray capacitance generated between the connection line and the electrode can be removed. Therefore, the electrostatic capacitance between the two electrodes becomes stable.

〔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.

Here, FIG. 1 is an enlarged schematic sectional view showing a weight sensor and the like of a high-frequency heating apparatus according to an embodiment of the present invention.

Further, the same reference numerals are used for the elements common to the conventional high-frequency heating apparatus shown in FIGS. 2 and 3, and suffixes are added to the elements common to the high-frequency heating apparatus and having different functions. To distinguish.

The first characteristic point of the high-frequency heating device 1a according to this embodiment
As shown in FIG. 1, one end of the substrate 22a is projected from an elongated hole 28 formed in the support member 14 of the weight sensor 5a, and a part of the substrate 22a on the one end side is the first electrode 16a. The same point is that the substrate 22a is attached to the support member 14 so as to face the above, and the second electrode 21a is formed in a pattern on a part of the substrate 22a that faces the first electrode 16. The second feature is that the second electrode 21a and the substrate 2 are
Connection pattern 30 for connecting to the detection circuit 19 formed on 2a
Is the point formed on the substrate 22a.

 The connection pattern 30 is an example of a connection portion.

That is, the pattern of the second electrode 21a and the connection pattern 30 are formed on the substrate 22a by etching or the like together with the circuit pattern for forming the detection circuit 19.

Therefore, it is easy to form these patterns without any special effort.

Further, as can be seen by comparing FIG. 3 and FIG. 1, in the high frequency heating device 1a, as described above, the substrate 22
By forming the pattern or the like on a, the components such as the lead wire 24, the second insulating spacer 18 and the screw 20 which are conventionally required can be reduced.

Therefore, the efficiency of assembling the weight sensor 5a of the high-frequency heating device 1a can be improved and the cost can be reduced.

Further, since the lead wire 24 is eliminated as described above, the stray capacitance between the lead wires 23, 24, the lead wire 24 and the first electrode 16, and the lead wire 24 and the support member 14, which have been generated conventionally, is reduced. To be removed.

Therefore, in this high frequency heating device 1a, the first and second electrodes 1
Since the capacitance value between 6 and 21a is stable, this weight sensor 5
The weight detection accuracy of a is high.

[Effect of device]

According to the present invention, two electrodes arranged opposite to each other, one of which is moved in the opposite direction according to the weight of an object to be heated, and a substrate on which a detection circuit for detecting a capacitance between the two electrodes is formed. In a high-frequency heating device, comprising: a connecting portion that connects the two electrodes and the detection circuit, and performing heating processing of the object to be heated based on a detection signal of the detection circuit, There is provided a high-frequency heating device, characterized in that the other electrode and the connecting portion that connects the other electrode and the detection circuit are formed on the substrate.

Therefore, the number of parts can be reduced and the influence of stray capacitance can be reduced.

[Brief description of drawings]

FIG. 1 is an enlarged schematic sectional view showing a weight sensor or the like of a high frequency heating apparatus according to an embodiment of the present invention, FIG. 2 is a schematic sectional view showing a conventional high frequency heating apparatus, and FIG. FIG. 4 is an enlarged schematic sectional view showing the weight sensor and the like, and FIG. 4 is a control circuit diagram of the high-frequency heating device. [Explanation of symbols] 1a …… High frequency heating device 4 …… Heating object 5a …… Weight sensor 16 …… First electrode (one electrode) 19 …… Detection circuit 21a …… Second electrode (other electrode) 22a …… Board 30 …… Connection pattern (connection part)

Claims (1)

[Scope of utility model registration request] 1. Two electrodes arranged opposite to each other, one of which is moved in the opposite direction according to the weight of an object to be heated;
A substrate on which a detection circuit for detecting a capacitance between two electrodes is formed, and a connecting portion for connecting the two electrodes to the detection circuit, and the heating target is based on a detection signal of the detection circuit. In a high-frequency heating device for performing a heat treatment of an object, the other electrode of the two electrodes and the connecting portion connecting the other electrode and the detection circuit are formed on the substrate. Characteristic high-frequency heating device.