JPH0432619A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To provide a heating and cooking device capable of sensing and displaying presence or absence of a reference data in a non-volatile memory with a mere and simple operation of turning-on a power supply by a method wherein the heating and cooking device is provided with a display control means for varying a displayed content of a displaying device in response to result of sensing performed by means for sensing presence or absence of data. CONSTITUTION:A non-volatile memory 20 is connected to a micre-computer 16. a turn table 8 is set to a rotary shaft 7a and a weight sensing signal fro a food while not being mounted is stored in the non-volatile memory 20 as a reference data. The micro-computer 16 may operate as the means for sensing a presence or absence of data and a display control means. As a power supply is turned on, the micro-computer reads data from the non-volatile memory 20 and judges the presence or absence of the reference data. If there is the reference data, 'weight' and '0000' are displayed in a displaying device 6 and in turn if there is no reference data, 'weight' and 'EEEE' are displayed in the display device 6. Accordingly, at a maker side, the power supply is turned on after a zero-point adjustment, a poor writing can be easily judged. In this case, since it is possible to perform a processing of a zero-point adjustment again, there is no possibility that a product is shipped while the reference data is not written in the non-volatile memory 20.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a food mounting table in a cooking chamber and a weight device that outputs a signal corresponding to the weight of food placed on the food mounting table. The present invention relates to a heating cooker equipped with a sensor.

(Prior Art) Conventionally, for example, in a microwave oven, a turntable serving as a food placement table is removably attached to a motor rotating shaft protruding into a cooking chamber. The rotating shaft and the motor are connected to a weight sensor, 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. In addition, this weight sensor is
A capacitive type with a counter electrode that is displaced according to weight is known.

In this type of microwave oven, a weight sensor detects the weight of the turntable and food, subtracts the weight of the turntable from this weight to determine the food weight, and heats the food based on the determined food weight. I'm trying to control it.

In this case, in order to determine the weight of the food, it is necessary to know the weight of only the turntable in advance, and for this reason, the user performs zero point adjustment for the weight. That is, a turntable with no food placed on it is set in the cooking chamber, and in this state, a switch for zero point adjustment is turned on.

Then, the detection signal from the weight sensor is stored in the RAM of the control circuit as reference data (zero point for weight).

However, in this case, the zero point adjustment on the user's side may be performed with food placed on the turntable, and erroneous data is often stored in the RAM as the reference data. Furthermore, even if the zero point adjustment is performed properly, the standard data will be lost in the event of a momentary power outage or when the power is turned off. Standard data is stored in memory.

In this case, a nonvolatile memory is used as the memory.

(Problem to be Solved by the Invention) However, in the above case, during the zero point adjustment on the manufacturer's production line, noise may intrude and cause a writing failure, especially when writing the detection signal from the weight sensor to the nonvolatile memory. In this case, there is a risk that the product will be shipped without reference data being written to the nonvolatile memory.

The present invention has been made in view of the above circumstances, and its object is to provide a cooking device that can detect and display the presence or absence of reference data in a nonvolatile memory.

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

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

(Example) An example of the present invention will be described below with reference to the drawings.

In FIG. 2, a microwave oven is shown as a heating cooker, and a cooking chamber 2 is formed inside the oven main body 1. This cooking chamber 2 is opened and closed by a door 3. Further, an operation panel 4 is provided on the front surface of the microwave main body 1, and various switches 5 and a display 6 are provided on the operation panel 4. A motor 7 for driving a turntable is located at the lower part of the bottom plate of the cooking chamber 2.
(see FIG. 1), whose rotating shaft 7a projects inward from the bottom plate of the cooking chamber 2. This rotating shaft 7a
A turntable 8 as a food table is detachably attached to the protruding end of the microwave oven. A waveguide 9 is formed in the upper part of the cooking chamber 2, and a magnetron 10 is provided at the end of the waveguide 9, and the microwaves output from the magnetron 10 are supplied to the cooking chamber 2. The magnetron] 0 has a power plug la connected to a commercial power source, a first door switch 11. a main relay 12. a rectifier circuit 13. an inverter circuit 14. a high frequency transformer 15. Power is supplied to the main relay 12 via the microcomputer 16.
The inverter circuit 14 is controlled by an inverter control circuit 17 which is controlled by a microcomputer 16 to change the output of the magnetron 10. Furthermore, various switches 5 and a display 6 provided on the operation panel 4 described above are connected to the microcomputer 16.

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. It is configured to detect weight by changing capacitance. A detection signal from this weight sensor 18 is provided to the microcomputer 16. Note that when the power plug is connected to a power outlet, the microcomputer 16 is supplied with DC power via a DC power supply circuit 19.

This microcomputer 16 has a non-volatile memory 20.
is connected to the nonvolatile memory 20, and a weight detection signal obtained when the turntable 8 is set on the rotating shaft 7a and no food is placed thereon is stored as reference data. This reference data is stored in advance by the manufacturer, and will be described later. Further, 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 details of each means will be explained with reference to FIG. 3.

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 nonvolatile memory 20 (step S1), and the presence or absence of reference data is determined (step S2). If there is a reference pig, the display 6 will display "weight" and "RO 000J" as shown in FIG. 4 (step S3); if there is no reference data, "weight" and "E E E El is displayed (step S4).

After this, cooking control is executed based on inputs from various switches 5 (step S5). Step S6 and subsequent steps are control contents for correcting the reference value, and will be briefly described. When the executed cooking was executed using the turntable 8 (determined in step S6)
, wait for door 3 to be opened (determined in step S7),
When the door 3 is opened, the weight detection signal is read from the weight sensor 18 (step S9) on the condition that the detection switch 21 is closed, that is, the turntable 8 is not removed (step S8). Comparing the weight detection result during cooking with the weight detection result during cooking, if the weight is lighter than the weight during cooking (step 510), it is determined that food has been taken out and only the weight of the turntable 8 has been detected. be done. In this case (rY in step S10
In the case of EsJ) If the weight detection signal in step S9 is lighter than the previous reference data (step 511)
This weight detection signal is written as new reference data (step 512). Note that if the weight detection signal in step S9 is not lighter than the reference data (step S1
1 rNOJ), weight detection signal or a predetermined amount, e.g. 50
If it does not weigh more than gram (step 513)
NO"), a fixed value, for example 10 grams, is added to the reference data and this is written into the non-volatile memory 20 as new reference data (step 514).

Now, reference data is written into the non-volatile memory 20 by the manufacturer, and in this case, with only the turntable 8 set, the weight detection signal from the weight sensor 18 is written into the non-volatile memory 20. A so-called zero point adjustment is performed.

When the manufacturer adjusts the zero point, especially when writing the detection signal from the weight sensor to the non-volatile memory 20, noise may enter and cause a write failure. There is a risk that the product may be shipped without being shipped.

However, according to the microwave oven of this embodiment, when the power is turned on, the presence/absence of the reference data in the nonvolatile memory 20 is changed.
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 point adjustment. In this case, since measures such as performing zero point adjustment again can be taken, there is no risk that eight products will be loaded without reference data being written to the nonvolatile memory 20.

[Effects of the Invention] As is clear from the above description, the present invention includes a food mounting table in a cooking chamber, a weight sensor that outputs a signal according to the weight of food placed on the food mounting table, and a non-volatile memory for storing the detection signal from the weight sensor as reference data when no food is placed on the table; and data for detecting the presence or absence of the reference data in the non-volatile memory when the power is turned on. The apparatus is equipped with a data presence/absence detection means, a display, and a display control means for changing the display content of the display according to the detection result by the data presence/absence detection means, and with this, the power supply is controlled. It has the excellent effect of detecting the presence or absence of reference data in the nonvolatile memory and displaying it with a simple operation of inputting the data.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a diagram schematically showing the electrical configuration and mechanical configuration, FIG. 2 is a perspective view of a microwave oven, and FIG. 3 is a flowchart showing control details. , 4 and 5 are partial front views of the display in different display states. In the drawing, 2 is a cooking chamber, 6 is a display, 7 is a motor, 7a is a rotating shaft, 8 is a turntable (food table) 10 is a magnetron, and 16 is a microcomputer (data presence/absence detection means and display control means) ) 18 is a weight sensor, 20
indicates non-volatile memory. Applicant Toshiba Corporation Patent Attorney Tsuyoshi Sato

Claims (1)

[Claims] 1. A food table in the cooking chamber, a weight sensor that outputs a signal according to the weight of the food placed on the food table, and the weight sensor when no food is placed on the food table. a non-volatile memory for storing the detection signal from the non-volatile memory as reference data;
A heating cooking device comprising: a non-detection means; a display; and a display control means for changing the display contents of the display according to the detection result of the data presence/absence detection means.