JP3511072B2 - Induction heating cooker - Google Patents

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 cooker having a turntable such as a microwave oven, and in particular, a high frequency equipped with a weight sensor for detecting the weight of food to be heated on the turntable for heating control. The present invention relates to improvement of a heating cooker.

[0002]

2. Description of the Related Art In a recent high-frequency heating cooker, the weight of a food material to be heated is automatically measured when the food material to be heated is placed on a turntable for cooking, and heating is performed according to the measured weight. , Which are configured to be automatically controlled are widely used.

FIG. 5 and FIG. 6 show an example of a high-frequency heating cooker provided with a conventional weight sensor, and the weight sensor shown in these figures is disclosed in Japanese Patent Application No. 8-3843.
It is disclosed in Japanese Patent Application Publication No. Hei 8-3465. FIG. 5 shows the positional relationship between the weight sensor and the turntable, and FIG. 6 shows the drive system of the turntable.

In FIG. 5, 31 is a heating chamber and 32 is a weight sensor, which is mounted below the heating chamber bottom plate 33. Reference numeral 34 is a turntable for placing food to be heated, which is provided in the heating chamber 31. Reference numeral 35 denotes a turntable plate on which the turntable 34 is placed, which is integrally mounted on the upper end of a support shaft 36 provided upright on the weight sensor 32. Then, the weight sensor 32 detects the weight of the food to be heated placed on the turntable 34, and the operation of the control unit (not shown) automatically controls the heating according to the detected weight.

In FIG. 6, reference numeral 37 denotes a gear shaft, which is formed in a cylindrical shaft shape, and a support shaft 36 is fixed in the cylindrical portion by press fitting. A convex portion 37a is formed on the lower end of the gear shaft 37. This bottom convex portion 37
The symbol a serves as a pivot point that rotates while supporting the weight of the food material to be heated placed on the turntable 34, and is abutted and supported by the central portion of the spring electrode member 38 of the weight sensor 32. Reference numeral 39 denotes a bearing or a bearing made of dry metal or the like, which is provided on the sensor stop plate 40 and has a function of smoothly rotating the support shaft 36.

Reference numeral 41 denotes a turntable rotation driving motor, which is fixed by a screw 43 to a motor mounting angle 42 provided below the heating chamber bottom plate 33. Motor 4
A power transmission mechanism that transmits the driving force of the motor 41 to the support shaft 36 is provided between the first rotation shaft and the support shaft 36. This power transmission mechanism is composed of a driving gear 44 attached to the motor rotating shaft and a driven gear 45 provided on the outer peripheral portion of the gear shaft 37, whereby the motor 4
The driving force of 1 is from the driving gear 44 to the driven gear 45, the support shaft 3
It is transmitted to the turntable 34 via 6.

The support shaft 36 is usually made of a ceramic material. That is, the support shaft may be made of metal, but in this case, a high frequency radio wave injected into the heating chamber 31 is induced in the metal support shaft and leaks out of the heating chamber 31. Therefore, as a countermeasure against this radio wave leakage, a separately known radio wave leakage prevention means such as a choke structure is required, and it is not in practical use at present. On the other hand, the ceramic material is an insulator that does not induce radio waves, so not only does the problem of radio wave leakage occur, but
Since it has excellent heat resistance and strength, it is an essential material especially for high frequency heating cookers with heaters.

FIG. 7 shows the sectional structure of the weight sensor, FIG. 8 shows the electrode pattern of the oscillation substrate, and FIG. 9 shows the spring electrode member 38.
FIG. 10 shows the circuit configuration of the weight sensor 32. As shown in these figures, the weight sensor 32 includes the above-described spring electrode member 38 and the oscillation substrate 46, and
The electrode pattern formed of copper foil or the like is arranged so as to overlap with the spring electrode member 38, and both ends thereof are attached to the motor mounting angle 4 as described later in detail.
The weight detector 48 is fixedly supported by being screwed together with the screw 47, and an IC 49 forming an oscillation circuit.

As shown in FIG. 8, in the electrode pattern of the oscillation substrate, the pattern of the substrate electrode 46a functioning as a fixed electrode has a large area in the central portion, and the oscillation substrate portion passing through the central portion of the substrate electrode 46a. Through hole 46b, and also through hole 42a at the corresponding portion of motor mounting angle 42.
The support shaft 36 fitted to the gear shaft 37 is mounted by penetrating these insertion holes 46b and 42a.

A substrate electrode 46a formed on the oscillation substrate 46
A pattern of an electrode 46c facing the spring electrode member 38 shown in FIG. 9 is formed around the substrate so as to surround the substrate electrode 46a. The spring electrode member 38 is closely attached to the counter electrode 46c, and the spring electrode member 38 is an insulating spacer. Screw 4 through 50
It is fixed to the motor mounting angle 42 by 7. Therefore, the screw 47 is
It is not electrically connected to the spring electrode member 38.

The spring electrode member 38 is electrically connected to the counter electrode 46c of the oscillation substrate 46. Further, as shown in FIG. 10, the counter electrode 46c is pattern-connected to the input a of the oscillator circuit IC49 composed of a plurality of inverting amplifiers. In FIGS. 8 and 10, 46d is a ground electrode.

In the weight detecting section 48 of the weight sensor 32 having the above structure, a force for pressing down the central portion of the spring electrode member 38 is applied to the support shaft 36 according to the weight of the food to be heated placed on the turntable 34. This action causes the pressing force to change the capacitance between the spring electrode member 38 and the substrate electrode 46a of the oscillation substrate 46. This change in capacitance causes the oscillation circuit I
Appearing as a change in the oscillation frequency of the oscillation circuit formed in C49, the change in the oscillation frequency is processed by a control unit (not shown) composed of a microcomputer, and the heated object on the turntable 34 is heated based on the calculation result. The heating control for the food is performed.

The motor 41 is attached to the motor mounting angle 42, and the motor mounting angle 42
Are attached to the sensor stop plate 40, and as a whole, they are fixed to an attachment plate 51 attached to the bottom plate 33 of the heating chamber 31 by welding or the like as shown in FIG. Each of the sensor stop plate 40, the motor 41, the motor mounting angle 42, the mounting plate 51, and the heating chamber bottom plate 33 is usually a metal product using a steel plate and is in an electrically conductive state. Therefore, the motor mounting angle 4
Reference numeral 2 is a ground potential, which is grounded to the body.

On the other hand, the substrate electrode 46a of the oscillation substrate 46 and the electrode of the spring electrode member 38 have a large area as apparent from FIGS. 8 and 9, and as described above, the static electricity between the substrate electrode 46a and the spring electrode member 38 is large. The capacitance changes depending on the weight of food. However, since the substrate electrode 46a of the oscillation substrate 46 and the spring electrode member 38 are not grounded in a circuit manner, the ground potential (GN
For D = 0 V, as shown by the broken line in FIG. 10, an electrostatic capacitance called stray capacitance (stray capacitance) 52 is generated.

[0015]

The conventional example configured as described above has the following problems. Ie the first
In addition, since the support shaft 36 is made of a ceramic material and the bearing 39 is made of a metal whose strength is inferior to that of the ceramic material, the support shaft 36 rotated by the motor 41 rotates while being supported by the bearing 39. When the metal bearing 39 is made of ceramic, the bearing 39 made of metal is used for a long time.
There is an inconvenience in that the support shaft 36 and the bearing 39 are widened due to the abrasion of the support shaft 36, and the rotation of the support shaft 36 becomes unstable.

Secondly, the contact between the ceramic material forming the support shaft 36 and the metal material forming the bearing 39 has poor sliding performance, is likely to cause abnormal noise, and causes large friction, so that the support shaft 36 is moved downward. Unnecessary frictional force affects the force of pressing down to
There is a problem that the measurement accuracy of the weight sensor is adversely affected.

Thirdly, the motor mounting angle 42 of the ground potential and the stray capacitance 51 generated between each electrode of the oscillation substrate 46 and the spring electrode member 38 are caused by the environment, the weight of the food to be heated, the difference in the assembly specifications, and the like. Since it varies depending on the factor, there is a problem that the oscillation frequency is not stable, the oscillation frequency varies, and the measurement accuracy deteriorates.

[0018]

The present invention has been made in view of the above problems, and in the invention of claim 1, the turntable provided in the heating chamber and the bottom wall of the heating chamber are penetrated. A support shaft made of a ceramic material that supports the turntable, a metal bearing hole that rotatably supports the support shaft, a prime mover that rotationally drives the support shaft, and a driving force of the prime mover. And a power transmission mechanism for transmitting to the support shaft, which is fitted to a contact portion of the support shaft with the bearing hole.
In a high-frequency heating cooker with a synthetic resin sleeve
Then, the supporting shaft side rotating member provided in the power transmission mechanism is
Composed of synthetic resin molding integrated with sleeve
The shaft and the synthetic resin that makes up the sleeve.
Excellent rotation and durability due to the metal constituting the bridge
In addition to realizing the bearing structure, the number of parts and the number of assembly steps
Can be reduced.

According to another aspect of the present invention, there is provided a turntable provided in the heating chamber, a support shaft made of a ceramic material for supporting the turntable provided through the bottom wall of the heating chamber, and the support shaft being rotated. A metal bearing hole that supports freely,
A high-frequency motor including a prime mover for rotationally driving the support shaft and a power transmission mechanism for transmitting a driving force of the prime mover to the support shaft, and a sleeve made of synthetic resin arranged at a contact portion with a bearing hole of the support shaft. The heating cooker further comprises a weight sensor for detecting the weight of the food to be heated, the sleeve, the supporting shaft side rotating member provided in the power transmission mechanism, and the lower end of the supporting shaft rotating member, Weight Sen
The number of parts and the number of assembling steps are reduced by being provided coaxially with the contact portion that comes into contact with the sir and by being formed of an integrated synthetic resin molded product. According to the third aspect of the present invention, the support shaft is fixed in an embedded state above the rotation transmitting portion of the support shaft-side rotating member located below the sleeve, thereby reducing the size of the support shaft made of an expensive ceramic material. To reduce costs.

According to another aspect of the present invention, there is provided a spring electrode member having a contact portion provided at a lower end of the rotating member on the supporting shaft side of the power transmission mechanism with which the contact portion abuts, an oscillation substrate having an electrode arranged to face the spring electrode member, and the spring. The weight sensor is provided with an electrode member and a mounting member having a ground potential for fixedly supporting both ends of the oscillation substrate, and the oscillation substrate of the weight sensor has a gap between the mounting member and at least the peripheral surface of the electrode. By arranging in advance, the oscillation board of the weight sensor and the mounting member do not come into close contact with each other at least around the electrode portion,
As a result, the stray capacitance generated between the oscillation substrate and the mounting member at the ground potential is reduced, and the oscillation frequency is stabilized and the food weight detection accuracy is improved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG.
-It demonstrates, referring FIG. 1 shows a high-frequency heating cooker of the present embodiment equipped with a weight sensor, FIG. 2 shows a drive system of a turntable, and FIG. 3 shows a sectional structure of the weight sensor.

In FIG. 1, the weight sensor 2 is attached to a mounting plate 4 fixed to a bottom plate 3 of the heating chamber 1 below the heating chamber 1 as in the conventional example described above. In addition, a turntable 5 provided in the heating chamber 1 for placing food to be heated.
Is mounted on the turntable plate 6 and is integrally attached to the upper end of a support shaft 7 made of a ceramic material and penetrating the bottom wall of the heating chamber and standing on the weight sensor 2. Then, the weight sensor 2 detects the weight of the food to be heated placed on the turntable 5, and the operation of a control unit (not shown) automatically controls heating according to the detected weight.

The turntable 5 is made of glass or the like,
As an accessory, it can be arbitrarily attached and detached from the heating chamber 1. The turntable plate 6 is usually made of a metal material and is detachably attached to the support shaft 7 as an accessory like the turntable 5. In the embodiment shown in FIG. 1, the turntable plate 6 is mounted on the support shaft 7 and the turntable 5 is detachably mounted on the turntable plate 6, but the turntable 5 is directly supported. It may be mounted on the shaft 7.

In FIG. 2, reference numeral 8 is a gear shaft serving as a support shaft side rotating member. The gear shaft 8 is provided with a driven gear 9 serving as a rotation transmitting portion at a substantially intermediate height portion in the vertical direction. The lower part of is formed of a synthetic resin molded product formed in a cylindrical shaft shape having a pressing shaft portion 8a at the center. 1
Reference numeral 0 denotes a synthetic resin sleeve which is a feature of the present invention, and is provided above the driven gear 9 coaxially with the gear shaft 8.

The sleeve 10 is formed in the shape of a short cylinder having a retaining portion 10a for the support shaft 7 on the inner circumference thereof, and the ceramic support shaft 7 is fixed therein by press fitting. The outer peripheral surface of the sleeve 10 is the sensor stopper plate 1
It is arranged so as to be fitted into the bearing hole 11a formed in No. 1 and thus functions as a bearing portion which receives the support shaft 7 and smoothly rotates. As a constituent material of the sleeve 10, a well-known synthetic resin material such as mineral nylon (trade name) having excellent heat resistance, abrasion resistance and strength is used.

The lower end portion of the gear shaft 8, that is, the pressing shaft portion 8a
Has a lower end projecting further downward from the lower end edge of the cylindrical shaft portion 8b, and this convex portion 8c acts as a contact point to serve as a pivot point that rotates while supporting the weight of the food material to be heated placed on the turntable 5. The spring electrode member 12 of the weight sensor 2
Is supported in contact with the central part of the. The spring electrode member 1
2 is made of a spring metal material.

A motor 13 as a turntable rotation driving prime mover is fixed to a motor mounting angle 14 provided below the heating chamber bottom plate 3. Between the rotary shaft of the motor 13 and the support shaft 7, the driving force of the motor 13 is applied to the support shaft 7.
Is provided with a power transmission mechanism. This power transmission mechanism is a driving gear 15 attached to a motor rotating shaft.
And the driven gear 9 provided on the outer peripheral portion of the gear shaft 8 described above, whereby the driving force of the motor 13 is transmitted from the driving gear 15 to the turntable 5 via the driven gear 9 and the support shaft 7. To be done.

As shown in FIG. 3, the weight sensor 2 has a well-known structure similar to the above-mentioned conventional example, and the spring electrode member 12 and the oscillation substrate 16 are mounted on the oscillation substrate 16 by copper foil or the like. A weight detection unit 18 which is disposed so as to overlap the formed electrode pattern so as to face the spring electrode member 12, and further has both ends thereof fixedly supported by being screwed together with a motor mounting angle 14 with a screw 17. It is composed of an IC 19 forming an oscillation circuit.

Since the structure and operation of the oscillator circuit are similar to those of the conventional example, the description thereof will be omitted. Further, the electrode pattern of the oscillation substrate 16 has the same structure as that shown in FIG. That is, 16a is a substrate electrode that functions as a fixed electrode provided in the central portion of the oscillation substrate, and 16b is a substrate electrode 16
It is an insertion hole provided in the center of a. Further, an insertion hole 14a is also formed in a corresponding portion of the motor mounting angle 14 as a ground potential mounting member, and the cylindrical shaft portion 8b of the gear shaft 8 is mounted by penetrating these insertion holes 16b and 13a. ing.

Reference numeral 16c denotes an electrode facing the spring electrode member 12, and the spring electrode member 1 is in close contact with the electrode 16c.
2 is fixed to the motor mounting angle 14 by the screw 17 via an insulating spacer 20. Therefore,
The screw 17 is not electrically connected to the spring electrode member 12 due to the interposition of the insulating spacer 20. Spring electrode member 1
2 is electrically connected to the counter electrode 16c of the oscillation substrate 16, and the counter electrode 16c is pattern-connected to the input of the oscillator circuit IC19.

Then, in the weight detecting portion 18 of the weight sensor 2, a force for pressing down the central portion of the spring electrode member 12 acts on the support shaft 7 according to the weight of the food to be heated placed on the turntable 5, This pressing force causes the spring electrode member 12
And the capacitance between the substrate electrodes 16a of the oscillation substrate 16 changes. This change in capacitance appears as a change in the oscillation frequency of the oscillation circuit formed in the oscillation circuit IC19, and the change in the oscillation frequency is arithmetically processed by a control unit (not shown) configured by a microcomputer, and the arithmetic result is obtained. Based on the above, heating control for the food to be heated on the turntable 5 is performed.

In the high-frequency heating cooker having the above structure, when the turntable 5 is rotated by the rotation of the motor 13, the sleeve 10 rotates integrally with the gear shaft 8. At the time of this rotation operation, since the sleeve 10 is made of synthetic resin, the bearing hole 11a of the sensor stop plate 11 is
On the other hand, the rotation is smooth with very little friction, resulting in less wear and excellent durability.

By thus covering the ceramic support shaft 7 with the sleeve 10, the metal bearing hole 1 is formed.
The wear of 1a can be minimized, and rattling of the rotation of the support shaft 7 can be prevented even after long-term use. Further, since the synthetic resin sleeve 10 and the metal bearing hole 11a have excellent sliding performance, the quietness during operation is maintained, and the support shaft 7 is pressed by the weight of the heated food material on the turntable 5. Since the frictional force hardly influences the lowering action, the reliability of the measurement accuracy of the weight sensor is improved.

The sleeve 10 is, as shown in FIG.
The upper end of the gear shaft 8 serving as the support shaft side rotating member may be extended to form a synthetic resin molded product integrated with the gear shaft 8. With such a configuration, the number of parts and the number of assembly steps can be reduced.

Further, particularly in the case where the sleeve 10 shown in FIG. 4 is integrated with the gear shaft 8, the dimension of the sleeve 10 is lengthened in order to enhance the functionality as a bearing portion, so that the support shaft 7 is fixed to the sleeve 10. Since the supporting shaft 7 can be supported by a portion, the supporting shaft 7 is fixed to the upper portion of the gear shaft 8 located below the sleeve above the driven gear 9 so that the length of the supporting shaft 7 can be reduced from the conventional one. The manufacturing cost of the support shaft 7 made of an expensive ceramic material can be reduced significantly.

As described above, in the weight sensor 2, the pressing shaft portion 8 of the gear shaft 8 existing coaxially below the support shaft 7.
a penetrates the insertion hole 14a of the motor mounting angle 14 and the insertion hole 15b of the oscillation board 16, and the lower end convex portion 8c presses the central portion of the spring electrode member 12. At this time, the spring electrode The member 12 is flexibly deformed, which changes the capacitance between the spring electrode member 12 and the oscillation substrate 16.

Therefore, in the present embodiment, as shown in FIG. 3, the motor mounting angle portion 14b located around the oscillation substrate electrode 16a does not come into close contact with the oscillation substrate 16.
The relevant portion of the motor mounting angle 14, ie, 2 so that there is a significant gap to the top surface of the oscillator substrate 16.
The motor mounting angle portion 14b between the portions fixed by the screws 17 is bent upward in a trapezoidal shape.
As a result, the distance between the electrodes of the motor mounting angle 14 and the oscillation substrate 16 can be significantly increased as compared with the conventional example.

As is well known, the electrostatic capacitance is inversely proportional to the distance between the electrodes, so that the increase in the distance between the electrodes means that the stray capacitance 52 shown in FIG. 10 can be greatly reduced. Therefore, the influence of the stray capacitance 52 on the oscillation circuit is reduced, stable oscillation is exhibited, weight accuracy is improved, and variations in the weight sensor 2 are reduced.

[0039]

As described above, according to claim 1 of the present invention, the supporting shaft side rotating portion provided in the power transmission mechanism.
Material is composed of synthetic resin molding integrated with sleeve
Therefore, the sleeve as a separate member is unnecessary.
Of course, the combination of the sleeve and the bearing hole
Bearing part can be configured, and as a result, the number of parts
Reduction and simplification of assembly work can be realized.

[0040] wherein when by claim 2, a sleeve, a support shaft-side rotational member provided in the power transmission mechanism, the support shaft side times
Contact provided on the lower end of the rolling member to abut the weight sensor
Since it is provided coaxially with the part and is constituted by an integrated synthetic resin molded product, it is possible to further reduce the number of parts and simplify the assembling work.

According to the third aspect of the present invention, since the support shaft side rotating member located below the sleeve is fixedly embedded in the upper portion of the rotation transmitting portion, the size of the support shaft made of an expensive ceramic material is The cost can be reduced by shortening.

According to the present invention, the oscillation substrate of the weight sensor is arranged with a gap from at least the peripheral surface of the electrode with respect to the mounting member, so that the oscillation substrate of the weight sensor and the mounting member have at least the electrode. Since the structure is such that it does not adhere to the periphery of the portion, the stray capacitance generated between the oscillation substrate and the mounting member at the ground potential can be reduced. Therefore, the influence of the stray capacitance generated on the spring electrode or the substrate electrode is reduced, stable oscillation is possible, and the reliability of the weight sensor such as accuracy and responsiveness can be improved.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional front view showing a positional relationship between a turntable and a weight sensor of a high-frequency heating cooker according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing a drive system and a weight sensor of the turntable.

FIG. 3 is a vertical sectional front view showing the outline of the structure of the weight sensor.

FIG. 4 is a vertical cross-sectional front view of essential parts showing another embodiment of the sleeve.

FIG. 5 is a schematic vertical sectional front view showing an example of a high-frequency heating cooker including a conventional weight sensor.

FIG. 6 is a vertical sectional front view showing a drive system and a weight sensor of the turntable.

FIG. 7 is a vertical sectional front view showing an outline of the structure of the weight sensor.

FIG. 8 is a plan view showing an electrode pattern of an oscillation substrate.

FIG. 9 is a plan view of a spring electrode member.

FIG. 10 is a circuit diagram showing a configuration of an oscillation circuit of a weight sensor.

[Explanation of symbols] 1 heating chamber 2 Weight sensor 3 Bottom plate (heating chamber bottom wall) 4 Mounting plate (mounting member) 5 turntable 7 Support shaft 8 Gear shaft (supporting shaft side rotating member) 8a Pressing shaft 8c Convex part (contact part) 9 Driven gear (rotation transmission part) 11 Sensor stop plate 11a Bearing hole 12 Spring electrode member 13 Motor (motor) 14 Motor mounting angle 14a insertion hole 14b Motor mounting angle facing the substrate electrode 15 Driving gear 16 oscillation board 16a substrate electrode 16b insertion hole

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Takeoka 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) Reference JP-A-4-350420 (JP, A) JP-A-8- 37087 (JP, A) Actually developed 60-123989 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H05B 6/78 F24C 7/02 H05B 6/68

Claims (4)

(57) [Claims] 1. A turntable provided in a heating chamber,
A support shaft made of a ceramic material, which penetrates the bottom wall of the heating chamber to support the turntable, a metal bearing hole that rotatably supports the support shaft, and a prime mover that rotationally drives the support shaft. And a power transmission mechanism that transmits the driving force of the prime mover to the support shaft, and a synthetic resin sleeve is arranged in a contact portion of the support shaft with a bearing hole. The high-frequency cooker characterized in that the supporting shaft-side rotating member provided in is made of a synthetic resin molded product integrated with the sleeve. 2. A turntable provided in the heating chamber,
A support shaft made of a ceramic material, which penetrates the bottom wall of the heating chamber to support the turntable, a metal bearing hole that rotatably supports the support shaft, and a prime mover that rotationally drives the support shaft. And a power transmission mechanism that transmits the driving force of this prime mover to the support shaft, and a high-frequency heating cooker in which a sleeve made of synthetic resin is arranged in a contact portion with the bearing hole of the support shaft. Further comprising a weight sensor for detecting the weight of the sleeve, the supporting shaft side rotating member provided in the power transmission mechanism, and the lower end of the supporting shaft rotating member,
It is provided coaxially with the contact part that contacts the weight sensor ,
A high-frequency heating cooker characterized by being formed of an integrated synthetic resin molded product. 3. The high frequency wave according to claim 1, wherein the support shaft is embedded in a portion above the rotation transmission portion of the support shaft side rotation member provided in the power transmission mechanism located below the sleeve in an embedded state. Heating cooker. 4. A spring electrode member with which a contact portion provided at a lower end of a rotating member of a supporting shaft of a power transmission mechanism abuts, an oscillation substrate having an electrode arranged to face the spring electrode member, the spring electrode member, and A weight sensor provided with a mounting member at a ground potential for fixedly supporting both ends of the oscillation substrate, and the oscillation substrate of the weight sensor is arranged with a gap from at least the peripheral surface of the electrode with the mounting member. The high frequency heating cooker according to claim 1 or 3, which is provided.