JPS63204026A - Weight sensor - Google Patents

Abstract

PURPOSE:To reduce the size, weight and cost of the title sensor, by a method wherein the weight sensor is constituted of a motor, having a driving shaft consisting of ceramics, and a capacity element, having a ceramic diaphragm, while one end of the driving shaft is brought into contact with one surface of the capacity element and the main body of the motor is integrated with the capacity element by a case. CONSTITUTION:An electrode 28 is printed onto a ceramic sheet 27 and glass adhesive agent 29 is applied annularly to bond and print it whereby a capacity element 24 is obtained. When the thickness of the ceramic sheet is designed so as to be 0.5 mm and a distance between electrodes is designed so as to be 50 microns, the capacity element having the electric capacity of 50 picofarad is obtained. An electric capacity is changed by 10 picofarad per a weight of 10 kg. This capacity is detected by the change of frequency and is processed whereby a weight may be known. A ceramic driving shaft 33 is movable within several mm in up-and-down direction and the lower end of the ceramic driving shaft contacts the upper surface (this surface functions as a diaphragm) of the capacity element 24. The capacity element 24 is supported on a motor case 34 and is integrated with the motor while the title sensor is mounted on a heating cooker.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention was made as a part for a heating cooker, and is used to heat an object that is placed on a mounting table and rotated for uniform heating. The present invention relates to a weight sensor that measures the weight of a person and controls heating according to the weight information.

2. Description of the Related Art Cooking devices that measure the weight of an object to be heated and control heating based on the information are well known. In particular, weight measuring means that determines the unknown weight of the object to be heated from the capacitance value that changes depending on the weight applied to the capacitive element is often used in cooking appliances.

Recently, studies have been underway to reduce the size of parts of some heating cookers in order to meet the market's demand for smaller and lighter weight products.

Problems to be Solved by the Invention In FIG. 5, an object to be heated 1 is placed on a placing table 2. In FIG. The weight of the object to be heated 1 is transmitted to the drive shaft 3 of the mounting table motor 4 that supports the mounting table 2, via the donkey pal mechanism 5 supporting the motor 4, through the buffer spring 6, and through the pressurizing point 7. , is transmitted to the capacitive element 8. donkey here
The pal mechanism 6 is often used in ordinary scales,
``This is a mechanism that allows the weight fulcrum 9 to move vertically up and down correctly, allowing accurate weighing. Especially when the vertical displacement is large, the effect of use is extremely large.

In the actual configuration, the accuracy will be improved if the fulcrum 9 is placed on the extension line of the support shafts 11 and 12 of the separator 1o.
Due to component arrangement, the fulcrum 9 is located slightly inside the left side of the separator 10. Further, the accuracy improves as the distance between the support shafts 11 and 12 increases, but there is a limit due to the design of the heater. Conventional weight detection means use the donkey pal mechanism 5 as described above, and are aimed at miniaturization under the constraints of space, but as a result, they are large in shape and have a large number of parts. It has become. Therefore, this has become a major problem in designing recent compact and lightweight heating cookers.

The present invention has been made to solve these problems and to develop a weight sensor for a cooking device that is small, lightweight, and low cost.

Means for Solving the Problems In order to solve the above problems, the weight sensor for a cooking appliance of the present invention is constructed as follows. In other words, it consists of a motor having a drive shaft made of ceramic and a capacitor element having a ceramic diaphragm, and one end of the drive shaft is in contact with one surface of the capacitor element either directly or through a shock absorber, and the motor body and the capacitor are connected to each other. It is a motor-integrated weight sensor in which the elements are integrated into one case.

Since the operational robo-hull mechanism is omitted and the weight sensor is integrated with the motor, the structure can be made slim. Furthermore, the number of parts can be significantly reduced, and the number of assembly steps can also be reduced.

Therefore, a small, lightweight, and inexpensive weight sensor can be prepared.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. Second
The figure shows a cooking device equipped with the weight sensor of the present invention. The heated object is taken in and out by opening and closing the door 13. The heating operation is performed by operating the operation panel 14. FIG. 3 is a diagram showing the operation of the heating cooker. The operation panel 14 has an automatic cooking button 16, and a manual button 16 is also provided. To auto-cook, first press auto-cook button 1.
5 from the menu and operate.

Thereafter, when the start button 17 is operated, heating is started. The heating procedure for automatic cooking is stored in the control unit 19. The control unit 19 transmits a command to start heating to the magnetron 2o through the driver 21.

At the same time that the cooling fan motor 22 starts operating to cool the magnetron 2o, the mounting table motor 23 in the integrated weight sensor 26 also starts operating for uniform heating.

In order to control heating, information from the humidity sensor 24 or the capacitive element 24 in the integrated weight sensor 26 is transmitted to the control section through the detection circuit 26 as necessary. To manually stop the operation, operate the stop button 18. FIG. 4 shows the capacitive element 24 used in the integrated weight sensor 26. Electrodes 28 are printed and baked on the ceramic plate 27, glass adhesive 29 is applied in a ring shape, and the entire adhesive baking process is performed to obtain the capacitive element 24. If the thickness of the ceramic plate is 0.5 mm and the distance between the electrodes is designed to be 50 microns, a capacitive element with a capacitance of 50 picofarads will be obtained. This shape can support up to 1 tskg of weight 3o. When the weight is 1 kg, the electric capacity changes by 1 kg. The weight can be determined by detecting and processing this capacitance based on frequency changes. FIG. 1 shows an integrated weight sensor according to the present invention in which a capacitive element 24 is integrated with a mounting motor 31. As shown in FIG.

The ceramic drive shaft 33 is movable up and down by several millimeters, and its lower end is in contact with the upper surface of the capacitive element 24 (this surface functions as a diaphragm). Furthermore, the capacitive element 24 is supported by the mounted motor case 34 and is integrated with the motor. The motor-integrated weight sensor of the present invention was installed in a cooking appliance, and the weighing accuracy was measured. The weighing accuracy up to 1 kq required for small-scale heating cooking was ±4%, which was judged to be sufficiently accurate for practical use.

Effects of the Invention The weight sensor of the present invention takes advantage of the fact that the movement of the diaphragm is extremely small, omits the donkey pal mechanism, and
Because it has an integrated motor configuration, it is not only the most compact and lightweight sensor of its kind, it also has fewer components and requires the least number of installation steps when attached to application equipment, reducing costs. The industrial effects are significant.

A plan sectional view and a side sectional view of the same capacitive element, and FIG. 6 is a front view of a conventional weight sensor.

24... Capacitive element, 31... Mounting motor, 33... Drive shaft, 34... Case.

Name of agent: Patent attorney Toshio Nakao and 1 other person
2 Figure

Claims (1)

[Claims] A motor having a drive shaft made of ceramic and a capacitive element having a ceramic diaphragm, one end of the drive shaft being in contact with one surface of the capacitive element directly or via a shock absorber, and A weight sensor that integrates the main body and the capacitive element mentioned above in one case.