JP2928488B2 - High frequency heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a high-frequency heating apparatus such as a microwave oven and a microwave oven, which comprises a weight sensor for detecting the capacitance between two electrodes to detect the weight of an object to be heated. More particularly, the present invention relates to a high-frequency heating device capable of reducing the number of components constituting the weight sensor and improving the weight detection accuracy of the weight sensor.

[0002]

2. Description of the Related Art FIG. 2 is a schematic sectional view showing a conventional high-frequency heating device.

[0003] At the bottom of the heating chamber 2 of the high-frequency heating device 1, a weight sensor 5 for detecting the weight of an object to be heated 4 mounted on a turntable 3 is connected to a shaft 8 by a heating sensor.
Is mounted so as to protrude from the hole 7 of the bottom plate 6.

[0004] As shown in FIG. 3, a turntable plate 10 for supporting the turntable 3 is attached to the upper end of the shaft 8.

The lower end 11 of the shaft 8 is supported by a support member 14 of the weight sensor 5 via two leaf springs 12 and slides up and down according to the weight applied to the shaft 8. A movable first electrode 16 that is displaced in accordance with the deflection of the leaf spring 12 is attached to a lower end 11 of the shaft 8 via an insulating spacer 15. Further, a fixed-side second electrode 21 is fixed to the support member 14 so as to face the first electrode 16 via an insulating spacer 18 and screws 20. The first and second electrodes 1
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 used to detect the capacitance between the first and second electrodes 16 and 21. It is connected to the substrate 22 on which the detection circuit 19 (FIG. 4) is formed.

When the object to be heated 4 is placed on the turntable 3, the leaf spring 12 is pushed down via the shaft 8 and the like due to its weight. Then, the first,
As the distance between the second electrodes 16 and 21 changes, the capacitance of the capacitor C (FIG. 4) formed by both electrodes changes. The output oscillation frequency of the detection circuit 19 changes according to the change in the capacitance.

The output oscillation frequency is controlled by the controller 25.
And the weight of the object to be heated 4 is calculated. Next, the heating time is adjusted in accordance with the weight, the microwave generation circuit 27 is driven and controlled via the switch circuit 26, and the object 4 is heated.

[0008]

As described above, the weight sensor 5 of the conventional high-frequency heating apparatus 1 is composed of a number of parts such as screws 20, lead wires 24 and the like, and it takes time to assemble the parts. I was

The weight sensor 5 detects the capacitance between the first and second electrodes 16 and 21 as described above. Since the wire 24 is routed in an unstable state, floating capacitance is generated between the lead wires 24 and 23, between the lead wire 24 and the first electrode 16, between the lead wire 24 and the support member 14, and the like.
The value of the stray capacitance changes due to the method of leading the lead wire 24, and the capacitance value between the first and second electrodes 16 and 21 is disturbed, so that the accuracy of detecting the weight of the object 4 to be heated deteriorates. There was a problem.

Therefore, the present invention reduces the number of parts of the weight sensor and reduces the influence of the stray capacitance,
The object of the present invention is to improve the detection accuracy of a weight sensor and to provide a compact and inexpensive high-frequency heating device.

[0011]

In order to achieve the above-mentioned object, the present invention provides two electrodes, which are provided to face each other , one of which is moved in the above-mentioned facing 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 connection portion for connecting the two electrodes and the detection circuit, wherein the substrate is heated based on a detection signal of the detection circuit. In a high-frequency heating device that performs a heat treatment of an object,
And the other electrode of said two electrodes, and a connecting portion for connecting the electrode and the detection circuit of said other formed on the substrate, distribution upward the other electrode with respect to one electrode the And an electronic component constituting the detection circuit is disposed on the upper surface side.

In this high-frequency heating device, the other of the two electrodes (corresponding to the second electrode 21 in FIG. 3) and a connection portion for connecting the other electrode and the detection circuit are formed on a substrate by, for example, a pattern. Therefore, it is not necessary to configure the connection portion with a connection wire, an insulating spacer, a screw, or the like of another component, and these components can be reduced.

Further, 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 capacitance between the two electrodes is stabilized. By arranging the other electrode on the upper side with respect to the one electrode and arranging the electronic components constituting the detection circuit on the upper surface side, the height of the electronic component does not protrude downward and the A compact weight detection unit can be configured, and a compact high-frequency high-frequency heating device can be provided.

[0014]

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

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

Elements common to the conventional high-frequency heating apparatus shown in FIGS. 2 and 3 are denoted by the same reference numerals, and elements common to the high-frequency heating apparatus and having different functions are further provided with a suffix a. Attach to distinguish.

High-frequency heating apparatus 1a according to this embodiment
First, as shown in FIG. 1, one end of the substrate 22a protrudes from a long hole 28 formed in the support member 14 of the weight sensor 5a, and a part of the one end of the substrate 22a is partially closed. The substrate 22a is attached to the support member 14 so as to face the first electrode 16, and a second electrode 21a is formed in a pattern on a part of the surface of the substrate 22a facing the first electrode 16. It is a point. The second characteristic point is that a connection pattern 30 for connecting the second electrode 21a and the detection circuit 19 formed on the substrate 22a is 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 combined with the circuit pattern for forming the detection circuit 19 by etching or the like.
2a.

Therefore, it is easy to form these patterns, and no special labor is required.

As can be seen from a comparison between FIG. 3 and FIG. 1, this high-frequency heating apparatus 1a has been conventionally required by forming the pattern on the substrate 22a as described above. Components such as the lead wire 24, the second insulating spacer 18, and the screw 20 are 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, as described above, since the lead wire 24 is eliminated, the lead wires 23, 24 which have conventionally been generated are eliminated.
Between the lead wire 24 and the first electrode 16, and between the lead wire 2
The floating capacitance between the support member 4 and the support member 14 is removed.

Therefore, in the high-frequency heating apparatus 1a, the capacitance value between the first and second electrodes 16 and 21a is stabilized, so that the weight detection accuracy of the weight sensor 5a is high.

Further, the second electrode 21a is connected to the first electrode 16
And the electronic components constituting the detection circuit 19 are arranged on the upper surface side, so that the electronic components do not protrude downward.

Therefore, a weight detecting unit having a compact height can be formed, and a compact high-frequency heating device 1a can be provided.

[0027]

The present invention exhibits, is opposed deployed, the detection circuit in which one detects the two electrodes formed by moving in the opposite direction according to the weight of the object to be heated, the capacitance between the two electrodes A high-frequency heating apparatus, comprising: a substrate on which is formed, a connecting portion connecting the two electrodes and the detection circuit, and performing a heating process on the object to be heated based on a detection signal of the detection circuit. and the other electrode of the two electrodes, and a connecting portion for connecting the electrode and the detection circuit of said other formed on the substrate, the other electrode with respect to one electrode the
Electronic components disposed on the upper side and constituting the detection circuit
Are arranged on the upper surface side.

Therefore, the number of components can be reduced and the effect of stray capacitance can be reduced. In addition, a compact weight detection unit can be constructed without the electronic components protruding downward, and the height can be reduced. A compact high-frequency heating device can be provided.

[Brief description of the drawings]

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

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

FIG. 3 is an enlarged schematic sectional view showing a weight sensor and the like of the high-frequency heating device.

FIG. 4 is a control circuit diagram of the high-frequency heating device.

[Explanation of symbols]

 1a High-frequency heating device 4 Heated object 5a Weight sensor 16 First electrode (one electrode) 19 Detection circuit 21a Second electrode (other electrode) 22a Substrate 30 Connection pattern

Claims (1)

(57) [Claims] 1. Two electrodes which are provided to face each other , one of which is moved in the above-mentioned opposite direction according to the weight of an object to be heated, and a detection circuit for detecting a capacitance between the two electrodes are formed. A high-frequency heating apparatus comprising: a substrate; and a connection portion that connects the two electrodes and the detection circuit, and performs a heating process on the object to be heated based on a detection signal of the detection circuit. and the other electrode of the inner, and a connecting portion for connecting the electrode and the detection circuit of said other formed on the substrate, the detection with the other electrode disposed on the upper side with respect to one electrode the A high-frequency heating device comprising electronic components constituting a circuit arranged on the upper surface side.