JP2799040B2 - Cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a food placing table in a cooking chamber and a weight for outputting a signal corresponding to the weight of food placed on the food placing table. The present invention relates to a cooking device provided with a sensor.

(Prior Art) Conventionally, for example, in a microwave oven, a turntable as a food placing table is detachably attached to a motor rotating shaft projecting into a cooking chamber. The rotating shaft is connected to a weight sensor together with the motor, and the weight sensor detects the weight of the turntable and the food placed on the turntable, and outputs a detection signal corresponding to the weight. As this weight sensor, a capacitance type provided with a counter electrode which is displaced according to the weight is known.

In this type of microwave oven, the weight including the turntable and the food is detected by a weight sensor, the weight of the turntable is subtracted from this weight to determine the weight of the food, and the cooking is performed based on the determined weight of the food. I try to control. In this case, to determine the weight of the food, it is necessary to know the weight of only the turntable in advance, and for this purpose, the user performs zero point adjustment on the weight. That is, a turntable in which no food is placed is set in the cooking chamber, and a switch for zero adjustment is turned on in this state. Then, the reference data (zero point for weight) is stored in the RAM of the detection control circuit from the weight sensor.

However, in this case, in the zero adjustment on the user side, the zero adjustment may be performed with the food placed on the turntable, and erroneous data is often stored in the RAM as the reference data. In addition, if the zero adjustment is performed properly, the reference data will be lost when an instantaneous power failure or when the power is turned off. The data is stored in the memory. In this case, a nonvolatile memory is used as the memory.

(Problems to be Solved by the Invention) However, in the above case, at the time of the above-mentioned zero adjustment in the manufacturer's production line, particularly when writing the detection signal from the weight sensor to the nonvolatile memory, noise enters and a writing failure occurs. In this case, the product may be shipped without the reference data being written to the nonvolatile memory.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating cooker capable of detecting presence / absence of reference data in a non-volatile memory and displaying the reference data.

[Configuration of the Invention] (Means for Solving the Problems) The present invention provides a food placing table in a cooking chamber, a weight sensor that outputs a signal according to the weight of the food placed on the food placing table, and the food A non-volatile memory for storing a detection signal from the weight sensor in a state where no food is mounted on a mounting table as reference data, and data for detecting presence / absence of reference data in the non-volatile memory when power is turned on. The apparatus comprises a presence / absence detection means, a display, and a display control means for changing display contents of the display in accordance with a detection result by the data presence / absence detection means.

(Operation) When the power is turned on, the presence / absence of the reference data in the nonvolatile memory is detected by the data presence / absence detection means. The display control means changes the display content of the display according to the detection result. Therefore, the presence or absence of the reference data in the nonvolatile memory can be known from the display contents. As a result, it is possible to easily determine a failure in writing the reference data to the nonvolatile memory.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

First, FIG. 2 shows a microwave oven as a heating cooker, and a cooking chamber 2 is formed inside a microwave oven main body 1. The cooking chamber 2 is opened and closed by a door 3. An operation panel 4 is provided on the front surface of the range main body 1, and various switches 5 and a display 6 are provided on the operation panel 4. A motor 7 (see FIG. 1) for driving a turntable is provided below the bottom plate of the cooking chamber 2, and its rotating shaft 7 a projects inside from the bottom plate of the cooking chamber 2. A turntable 8 as a food table is detachably attached to the protruding end of the rotating shaft 7a. In FIG.
The electrical schematic configuration of the microwave oven is shown together with the mechanical schematic configuration. A waveguide 9 is formed at an upper portion of the cooking chamber 2, and a magnetron 10 is provided at an end of the waveguide 9, and microwaves output from the magnetron 10 are transmitted to the cooking chamber 2.
To cook the food. The magnetron 10 has a power plug connected to commercial power
1a, first door switch 11, main relay 12, rectifier circuit 13,
Power is supplied through an inverter circuit 14 and a high-frequency transformer 15. The main relay 12 is controlled by a microcomputer 16, and the inverter circuit 14 is controlled by a microcomputer.
The output of the magnetron 10 is controlled by an inverter control circuit 17 which is controlled by 16. Further, the microcomputer 16 is connected to various switches 5 and a display 6 provided on the operation panel 4 described above.

On the other hand, the weight sensor 18 includes a displacement member that supports the motor 7 and a counter electrode that is displaced by the displacement of the displacement member, and the electrostatic force of the counter electrode depends on the weight applied to the rotating shaft 7a of the motor. In this configuration, weight is detected by changing the capacity. The detection signal from the weight sensor 18 is given to the microcomputer 16. When a power plug is connected to a power outlet, the microcomputer 16 is supplied with DC power via a DC power circuit 19.

A non-volatile memory 20 is connected to the microcomputer 16, and the non-volatile memory 20 has a turntable 8 set on the rotary shaft 7a, and a weight detection signal in a state where no food is placed thereon is used as a reference. It is stored as data. This reference data is stored in advance by the manufacturer, and will be described later. The switch 21 is a detection switch provided to be closed when the turntable 8 is set.

The microcomputer 16 functions as data presence / absence detection means and display control means, and the control contents of each means will be described with reference to FIG.

The flowchart shown in FIG. 3 starts when the power plug is connected to the power outlet, that is, when the power is turned on.

When the power is turned on, data is read from the non-volatile memory 20 (step S1), and the presence or absence of reference data is determined (step S2). If there is reference data, display 6
As shown in the figure, "weight" and "0000" are displayed (step S3), and if there is no reference data, "weight" and "EEEE" are displayed as shown in FIG. 5 (step S4). After that, the cooking control is executed based on the input from the various switches 5 (step S5). Step S6 and subsequent steps are control contents for correcting the reference value, and will be described briefly. If the executed cooking is performed using the turntable 8 (determined in step S6), the process waits until the door 3 is opened (determined in step S7). Under the condition that the switch 21 is closed, that is, the turntable 8 is not removed (Step S8), a weight detection signal is read from the weight sensor 18 (Step S9). If the weight detection result at this time and the weight detection result during cooking are smaller than the weight during cooking (step S10), it is determined that the weight of only the turntable 8 is detected due to the removal of the food. Is determined. In this case (in the case of “YES” in step S10), if the weight detection signal in step S9 is lighter than the previous reference data (step S11), the weight detection signal is written as new reference data (step S12). Step S9
Is not lighter than the reference data (“NO” in step S11), if the weight detection signal is not heavier than a predetermined amount, for example, 50 grams (“NO” in step S13), 10 grams are added and written into the nonvolatile memory 20 as new reference data (step S14).

By the way, the reference data is written in the nonvolatile memory 20 by the manufacturer side. In this case, with only the turntable 8 set, the weight detection signal from the weight sensor 18 is written to the nonvolatile memory 20, So-called zero point adjustment is performed. At the time of zero adjustment on the manufacturer side, especially when writing a detection signal from an important sensor to the non-volatile memory 20, noise may enter and cause a writing failure.In this case, the reference data is written to the non-volatile memory 20. There is a risk that the product will be shipped without it.

However, according to the microwave oven of the present embodiment, when the power is turned on, the non-volatile memory 20 stores the reference data.
Since nothing is detected and the result is displayed on the display 6,
The manufacturer can easily determine a write failure by turning on the power after the above-mentioned zero adjustment. In this case, since a measure such as the zero point adjustment can be performed again, there is no possibility that the product is shipped without the reference data being written in the nonvolatile memory 20.

[Effects of the Invention] As is apparent from the above description, the present invention provides a food mounting table in cooking, a weight sensor that outputs a signal corresponding to the weight of the food mounted on the food mounting table, and the food mounting table. A non-volatile memory for storing a detection signal from the weight sensor in a state where no food is placed on the table as reference data, and data for detecting presence / absence of the reference data in the non-volatile memory when power is turned on A presence / absence detection means, a display, and a display control means for changing display contents of the display in accordance with a detection result by the data presence / absence detection means. With the simple operation of inputting the reference data, there is an excellent effect that the presence or absence of the reference data in the nonvolatile memory can be detected and displayed.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention. FIG. 1 is a diagram schematically showing an electrical configuration and a mechanical configuration, FIG. 2 is a perspective view of a microwave oven, and FIG. 4 and 5 are partial front views of the display in different display states. In the drawings, 2 is a cooking room, 6 is a display, 7 is a motor, 7a is a rotating shaft, 8 is a turntable (food table), 10 is a magnetron, 16 is a microcomputer (data presence / absence detection means and display control). Means), 18 is a weight sensor, 20 is a nonvolatile memory.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F24C 7/02 301 F24C 7/02 315

Claims (1)

(57) [Claims] A food loading table in a cooking chamber, a weight sensor for outputting a signal corresponding to the weight of food placed on the food loading table, and a food sensor in a state where no food is loaded on the food loading table. A nonvolatile memory for storing a detection signal from the weight sensor as reference data, data presence / absence detection means for detecting presence / absence of reference data in the nonvolatile memory when power is turned on, a display, A heating cooker comprising: display control means for changing display contents of the display in accordance with a detection result by data presence / absence detection means.