JPH04186022A - Electronic range - Google Patents

Abstract

PURPOSE:To prevent incomplete heating of a food or any damage of a square dish and a heating chamber by judging whether or not the square dish is mounted on the basis of a detection result by an optical sensor while judging whether or not an article to be heated is mounted on a turn table on the basis of a decision result of a weight sensor. CONSTITUTION:A range mode is selected, and, once a square dish 9 being detected not to be mounted on the basis of a detection result of an optical sensor 4, a relay L1 and a relay L3 are turned on to drive a magnetron 1 and a turn table motor 7'. Further, when a grill mode is selected and nothing is judged to be placed on the turn table 6 on the basis of a detection result of a weight sensor 7, a relay L2 is turned on to drive a heater 3. Further, when a toast mode is selected and the square dish 9 is not placed, the heater 3 and the turn table motor 7 are driven.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a microwave oven equipped with a heater heating means and capable of performing grill cooking and browning cooking in addition to range cooking.

[Conventional technology]

Conventionally, this type of microwave oven is equipped with an optical sensor that detects the browning of food and a weight sensor that detects the weight of the food, so that automatic finishing control of the food can be performed. FIG. 3 is a diagram explaining the various cooking modes of the conventional microwave oven. (a) shows the toast mode for browning toast, etc., and (b) shows the grill mode for cooking grilled fish etc. over high heat. (c) shows the Lenz mode in which the rice is warmed and rubbed once. In these figures, 1 is a magnetron, 2 is a waveguide,
3 is a heater, 4 is an optical sensor using a CdS photoconductive element, 5 is an oven, 6 is a turntable, and 7 is a weight sensor integrated with the turntable motor. In the toast mode shown in FIG. 3(a), food 8 such as toast is placed on the turntable 6, the turntable 6 is rotated, and the heater 3 heats the food. In this toast mode, the weight sensor 7 measures the weight of the food 8 and the heating time is set according to the weight of the food, or the optical sensor 4 detects the burning of the food 85) and the food 8 is heated. It is possible to perform irregular heating control by turning off the heater 3 at a moment's notice when determining the optimum timing. In the Kurilmort shown in FIG. 3(b), a square plate 9 is placed on shelves 5a and 5b provided on the side wall of the oven 5, a wire mesh 10 is placed on top of the square plate 9, and grilled fish etc. are placed on top of the square plate 9. Food 1
1 is placed on the food 11, and the food 11 is heated by the heater 3. In the range mode shown in FIG. 3(c), the food 12 is placed on the turntable 6, the turntable 6 is rotated, and the microwaves oscillated by the Macnetron 1 are guided into the oven 5 through the waveguide 2. Heat 12. Even in this range mode, the weight sensor 7 measures the weight of the food 12, and the magnetron can be controlled according to the weight.

[Invention or problem to be solved]

By the way, in the above conventional microwave oven, f2 is selected regardless of whether food is placed on the turntable 6 or whether or not the square plate 9 is placed on the shelves 5a, 5b. Heating is started using the heating mode. Therefore, if the square plate 9 is placed on the toast mode by mistake, the heat from the heater 3 will be interfered with by the square plate 9 or the wire mesh 10, and the food on the table 6 will not burn or be incompletely heated. When it gets to the track state, there are L) and f2 problems. Also, if the square plate 9 is placed on the microwave in microwave mode 1 by mistake, the microwave or the square plate 9 will interfere with the microwave and the food will not reach the food on the turntable 6, resulting in the food being incompletely heated. If this happens, there will be problems such as the F2 problem, or if the microwaves cause electrical discharge at the point where they come into contact with the square plate 9 or the oven 5, causing damage to the square plate 9 or the oven 5. Further, in the grill mode, if food is placed on the turntable 6 by mistake, there will be a second problem if the food on the turntable 6 becomes incompletely heated. Therefore, the purpose of this invention is to prevent heating from starting if a square plate is mistakenly placed on the turntable in microwave mode or toast mode, or if food is mistakenly placed on the turntable in grill mode. An object of the present invention is to provide a microwave oven which prevents the above-mentioned problems from occurring.

[Means to solve the problem]

To achieve the above object, the present invention includes a cooking mode in which an object to be heated on a turntable is heated by a high-frequency heating means, and a cooking mode in which an object to be heated on the turntable is heated by a heater heating means. There is a toast mode that browns the object to be heated, and a f
A grill mode can be selected in which a square plate is placed on the second shelf and the object to be heated on the square plate is heated by the heater heating means, and an optical sensor mounted on the turntable detects the browning of the object to be heated. In a microwave oven that is capable of automatic finish control based on the detection results of a weight sensor that detects the weight of the object to be heated mounted on the turntable, The first step is to determine whether the square plate is attached or not.
a determining means; a second determining means for determining whether or not an object to be heated is mounted on the turntable based on the detection result of the weight sensor;
The first determining means determines that the square plate is not attached and drives the high-frequency heating means only once, and when the Kurilmort is selected, the second determining means determines that the object to be heated is on the turntable. The heater heating means is driven only when it is determined that the square plate is not installed, and when the toast mode is selected, the heater heating means is activated only when the first determining means determines that the square plate is not attached. The invention is characterized by comprising a control means for driving.

[Effect]

Since the intensity of the light incident on the optical sensor is different depending on whether a square plate is placed on the shelves provided on both side walls of the heating chamber or not, the first discrimination means is configured to detect the optical sensor. Based on the detection result, it is determined whether or not the square plate is attached. - On the other hand, the second determining means determines whether or not an object to be heated is mounted on the turntable from the detection result of the weight sensor. Then, when the control means or the reno motor is selected, the first discriminating means drives the high frequency heating means to determine whether the rectangular plate is installed or not. If No 1 is selected, the second determining means drives the heater heating means only to determine that no object to be heated is mounted on the turntable, and if the toast mode is selected. The above 1st
Discrimination means The heater heating means is actuated only when it is determined that the knife and the square plate are not attached. Therefore, when Lenz mode or toast mode is selected with a square plate or a sheet attached to it, the high frequency heating means or heater heating means will not be activated, resulting in incomplete heating of the food or heating of the square plate or heating chamber. This eliminates the possibility of electrical discharge caused by microwaves occurring at the point of contact with the heating chamber, and damage to the square plate or heating chamber. If the grill mode is selected while food is placed on the turntable, the heater heating means will not be driven, and the food will not be incompletely heated.

【Example】

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. The schematic equipment configuration of this example is as shown in Figure 3.
The circuit is shown in FIG. In FIG. 1, reference numeral 21 denotes an operation panel, which controls on/off of the power switch 29 and operation keys 22 .
23 and 24, it is possible to select cooking modes such as microwave mode, grill mode, and toast mode, and to set the heating time using a timer (not shown). 25 is a microcomputer (hereinafter abbreviated as microcomputer) as a control means, and the operation panel 21
Relays Ll, L2 . Drive L3. That is, if microwave mode is selected, sushi
Turn on L3 to rotate the turntable motor 7 degrees, turn on relay +-1, and turn on the high/lower transformer 2.
6. Macrotron/l is driven via the capacitor 27 and diode 28. The heating time by the magnetron 1 is set by the operation panel 21 or measured by the weight sensor 7 and controlled according to the weight of the food. On the other hand, if grill mode is selected, relay L2
Turn on and drive the heater 3. The heating time at this time is set on the operation panel 21. Also, if toast mode is selected, relay L3
is turned on to rotate the turntable motor 7', and at the same time, the relay L2 is turned on to drive the heater 3. The heating time at this time is set by the operation panel 21, or is determined by the time required to achieve the optimum browning based on the detection result of the optical sensor 4. The microcomputer 25 also determines whether food is placed on the turntable 6 based on the detection result of the weight sensor 7, and also determines whether food is on the square plate 9 based on the detection result of the optical sensor 4.
It is determined whether the relay L1. Controls L2 and L3. The square plate 9 is mostly made of iron plate with black enamel processing.
The output of the optical sensor 4 changes significantly compared to when there is no square plate (for example, the resistance value increases in the case of the optical sensor 4 or CdS), and the microcomputer 25 detects the presence or absence of a square plate from the output. I'll come. FIG. 2 is a flowchart of control according to the above judgment result. In FIG. 2, when a cooking mode is selected in step St, it is determined in step S2 which cooking mode is selected. Then, if it is determined that range mode has been selected,
Proceeding to step S3, from the detection result of the optical sensor 4, the square plate 9
Determine whether it is listed. If the square plate 9 is placed on the plate, the process proceeds to step S9 and an alarm is displayed on the operation panel 21. If the square plate 9 is not placed on the plate, the process proceeds to step S4, where relays L+ and L3 are turned on, and the magnetron 1 and turntable are turned on. Drive motor 7°. If it is determined that the grill mode is selected in step S2, the process proceeds to step S5 and it is determined from the detection result of the weight sensor 7 whether or not there is anything on the turntable 6. If there is anything on the turntable 6, an alarm is displayed in step S9. If nothing is placed on the turntable 6, the process advances to step S6, where the relay L2 is turned on and the heater 3 is driven. If it is determined that the toast mode has been selected in step S2, the process proceeds to step S7, where it is determined whether the square plate 9 is placed on the plate, and if the square plate 9 is placed on the plate, the process proceeds to step S.
An alarm is displayed in step S9, and if the square plate 9 is not placed, the heater 3 and turntable motor 7' are driven in step S8. In this way, if the square plate 9 is placed on the stove when the microwave mode is selected, the magnetron L will not be driven, so the food on the turntable 6 will be incompletely heated and will not be eaten. In other words, it is possible to prevent damage to the square plate 9 and the oven 5 due to microwave discharge occurring at the contact point between the square plate 9 and the oven 5. When f2, grill mode is selected, the heater 3 is not activated if there is any food on the turntable 6, so if there is food on the turntable 6 or incomplete heating. This prevents the food from getting too hot and not being able to spread.Also, if the toast mode is selected and the square plate 9 is on the plate at the same time, the heater 3 is not activated.
It is possible to prevent the food on the turntable 6 from being incompletely heated and becoming inedible. In the above embodiment, when microwave mode or toast mode is selected, in addition to determining the presence or absence of a square plate, it is also determined whether or not there is an object on the turntable. If not, the magnetron, heater, or turntable may not be driven. Also, when the grill mode is selected, in addition to determining whether there is an object on the turntable, it also determines whether there is a square plate or not.
The heater may not be driven unless there is a square plate on it. [Effects of the Invention] As is clear from the above, in the microwave oven of the present invention, the square plate is attached based on the detection result of the first determining means or the optical sensor that detects the browning of the object to be heated mounted on the turntable. On the other hand, the second determining means determines whether the object to be heated is mounted on the turntable based on the detection result of a weight sensor that detects the weight of the object to be heated mounted on the turntable. and the control means drives the high frequency heating means only when the first determining means determines that the square plate is not attached when the range mode is selected, and the grill mode is selected. In this case, the second determining means drives the heater heating means only when determining that there is no object to be heated on the turntable, and when the toast mode is selected, the first determining means The heater heating means is activated only when it is determined that the square plate is not attached, so if the range mode or toast mode is selected, the high frequency heating means is activated when the square plate is not attached. In the case of mafco, the heater heating means is not activated, which may cause incomplete heating of the food, or microwave discharge may occur where the square plate comes into contact with the heating chamber, causing damage to the square plate or the heating chamber. In addition, if the Kuril Mort is selected, the heater heating means will not be driven while food is placed on the turntable, causing the food on the turntable to become incompletely heated. Never.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a flowchart showing heating control in the above embodiment, and Fig. 3 is a diagram showing the states of a general microwave oven equipped with a heater in each cooking mode. , (a) is a diagram showing the toast mode,
(b) is a diagram showing grill mode, and (c) is a diagram showing range mode. Tomagnetron, 2. Waveguide, 3. Heater, 4. Optical sensor, 5. Oven, 6. Turntable, 7. Weight sensor, 7° turntable motor, 9.. Square plate,
IO wire mesh, 21 operation panel, 22.23.24 operation keys, 25 microcomputer, Ll, L2. L3 relay.

Claims (1)

[Claims] (1) As cooking modes, there is a microwave mode in which the object to be heated on the turntable is heated by high-frequency heating means, and a toast mode in which the object to be heated on the turntable is heated by the heater heating means to brown the object to be heated. mode and a grill mode in which a square plate is placed on a shelf provided on both sides of the heating chamber and the object to be heated on the square plate is heated by the heater heating means. The electronic device is capable of automatically controlling the finished product based on the detection results of an optical sensor that detects the browning of the heated object and a weight sensor that detects the weight of the heated object mounted on the turntable. In the range, a first determining means determines whether or not the square plate is attached based on the detection result of the optical sensor, and whether or not an object to be heated is mounted on the turntable based on the detection result of the weight sensor. a second discriminating means for discriminating whether the oven mode is selected and the first discriminating means drives the high frequency heating means only when the first discriminating means discriminates that the square plate is not attached, and the grill mode is selected. the second determination means drives the heater heating means only when the second determination means determines that there is no object to be heated on the turntable, and when the toast mode is selected, the first determination means A microwave oven characterized by comprising: control means for driving the heater heating means only when the means determines that the square plate is not attached.