JPS6235019B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave heating device equipped with a weight detection device, in particular a detector that detects weight as a change in electrical impedance, and a microwave output device that detects weight as a change in electrical impedance. In a microwave heating device equipped with an arithmetic and control circuit for controlling, among the components of the detection mechanism,
The receiving tray can be pulled out from inside the microwave heating device body as needed, and the microwave heating device automatically cooks food optimally according to the weight of the food.It is easy to use, has an excellent appearance, and is highly reliable. The purpose is to provide

When heating food with microwaves, most of the energy is absorbed by the food being heated, unlike when using conventional heat sources. Therefore, it is very difficult to set an optimal cooking time because the time required for heating increases as the weight of the food increases. Especially when defrosting food, if you heat it for longer than the optimum time, for example the raw fish you are trying to make into sashimi will end up being boiled, it will be a disaster, so set the heating time according to the weight of the food. There is a need to.

From the above point of view, a microwave heating device has been proposed in which the microwave heating device is equipped with a weight detector and a microwave output control device that operates in conjunction with the weight detector.

However, in reality, microwave heating devices of this type are hardly ever put into practical use. The first reason is the location of the tray on which the food is placed. In other words, in order to measure the weight of food, there must be enough space around the receiving tray to place the food. The simplest method is to install a cargo tray on the top of the main body of the microwave heating device. However, considering the general conditions of use,
The top surface of the body is very inconvenient to use because you can put other things on it, there's a shelf on it, or it's installed so high that it's hard to reach.

Another idea is to use the turntable itself in the heating chamber of the microwave heating device in combination with the cargo tray, but considering the technical difficulty and cost, it is not recommended to use it as a general household microwave heating device. is not a realistic method.

The present invention solves the problems of the conventional example and provides a microwave heating device equipped with a weight detection device that is easy to use and very practical in terms of technology and cost.

The embodiment will be explained below with reference to FIGS. 1 and 2. Note that the same symbols are used for the same parts.

FIG. 1a is an external view of the microwave heating device according to the present invention, FIG. 1b is a detailed explanatory diagram of the weight detection mechanism, and FIG. 2 is a block diagram of the weight detection and control functions.

When food is placed on the receiving tray 11, the weight detector 6
The impedance (resistance of a strain gauge in this example) of the weight detecting element 6c built inside changes depending on the weight. This change can be calculated as an electrical signal.
The information is transmitted to the control circuit 8, and an optimal cooking sequence is determined. When food is placed in a heating chamber (not shown) and the start switch 13 is pressed, the output of the magnetron 10 is controlled by the arithmetic/control circuit 8 according to the sequence, and optimal heating is performed. In this case, it goes without saying that the configuration can be such that the type of food to be cooked can be selected using the operation panel 4 and the optimal cooking sequence can be determined for each type. Further, the display tube 3 can also be configured to display the weight of the food and the cooking time.

The load receiving tray 11 is rotatably attached to the Roberval mechanism 6a via an arm 14, and when using the weighing function, it can be pulled out from inside the body 1 of the microwave heating apparatus main body and pulled out as shown in FIG. 1a. It is used on the front of body 1, and when not in use, it is rotated and stored inside body 1, with lid 5
It is constructed so that it is closed and cannot be seen from the outside.

When food is placed on the receiving tray 11, a force proportional to the load is applied to the strain-generating material 6b by the Roberval mechanism 6a fixed to the main body 1 of the microwave heating device, and this is resisted by the strain gauge 6c, which is a weight detection element. Detected as a change. The function of the Roberval mechanism 6a has been used for a long time as a basic mechanism forming a weighing mechanism, and will not be explained in detail here. An equal force will be applied in the direction. Here, A, B, C, and D are the vertices of a parallelogram that constitutes the Roberval mechanism, which is composed of only one side of the so-called original type of Roberval mechanism.

Therefore, according to the method of the present invention, since the detection is performed using an electric signal, calculation and control are automatically performed, and even though the load receiving tray 11 can be taken out and used only when necessary, it is not necessary to convert the load into an electric signal. The impedance element to be converted is fixed to the main body 1 of the microwave heating device, and only the mechanical parts that do not include electric circuits are movable, so there is no need to pull or pull lead wires, making it easy to use when frequently used. To provide a microwave heating device which is excellent in ease of use and appearance, and which can automatically perform optimal cooking according to the weight of food, without causing reliability problems such as kinking or disconnection of lead wires, and which is highly reliable. I can do it.

In the above description, a resistor, ie, a strain gauge, is used as the impedance element, but it is clear that the same configuration can be achieved using other elements such as capacitance and inductance.

Although we have shown an example in which a Roberval mechanism is used as a load transmission mechanism, as a simple method, as shown in Fig. 3, by simply using two parallel leaf springs 6e, both the Roberval mechanism and the spring function can be achieved. It is also possible to have the function of

[Brief explanation of the drawing]

FIG. 1a is an external view of a microwave heating device showing an embodiment of the present invention, FIG. 1b is a detailed explanatory diagram of the weight detection mechanism, FIG. 2 is a block diagram of the weight detection and control function, FIG. 3 is a detailed explanatory diagram showing another embodiment of the weight detection mechanism of the microwave heating device according to the present invention. 1...Microwave heating device main body, 3...
Display tube, 4...operation panel, 6...weight detection mechanism, 8...arithmetic/control circuit, 10...magnetron, 11...load receiving pan, 14...arm.

Claims (1)

[Claims] 1 Equipped with a weight detector that detects weight as a change in impedance (resistance, capacitance, or inductance) and an arithmetic/control circuit that automatically controls microwave output according to this impedance change, A displacement mechanism such as a strain-generating material that converts weight into mechanical displacement by allowing only some mechanical parts of the component parts, including the load receiving tray, to be pulled out and used from the body of the microwave heating device main body as necessary; is attached to
A microwave heating device characterized in that an impedance element that converts this mechanical displacement into impedance is fixed within the body.