JP2525798Y2 - Cooker - Google Patents

Description

[Detailed description of the invention] [Industrial applications]

 This invention relates to a cooking device.

[Prior art]

In a conventional heating cooker, when a food such as a toast is heated, the setting of the heating time is generally performed manually using a timer. As for the automatic heating, the setting of the heating time is manually performed by a timer as described above, and the temperature of the heating chamber is detected by a temperature detecting means such as a thermistor. In some cases, the set heating time is corrected. In addition, the amount and type of the food to be heated (for example, the number of breads in the case of toast cooking, and the difference between normal bread and frozen bread) are input by means, and according to the amount and type of the input food, In some cases, the heating time is automatically controlled.

[Problems to be solved by the invention]

By the way, in the above-mentioned conventional cooking device, there is a problem that operation is troublesome, inconvenient, and an input error occurs because there is much information to be manually input. Therefore, recently, a method using a light detection unit has been attracting attention as one of the methods for determining the finished condition of food with little input information. The most representative of this light detection means is cadmium sulfide (CdS) as a light receiving element.
There is an element that uses an element whose resistance value changes in accordance with the illuminance of light, and extracts the change in the resistance value as a change in a voltage level. As a method of controlling the finished condition of food using the light detection means, for example, light from an interior light reflected on the surface of food is detected by the light detection means, and the light detection means There is one in which the degree of scorching of food is determined from the absolute value or the range of change of the output signal level, and heating is automatically controlled. However, when judging the finished condition of food based on the absolute value or the width of change of the output signal level of the light detection means, the sensitivity or resistance of the light receiving element varies, so that the finished condition of the food (burned ), And the finished state changes due to a change in sensitivity or resistance value due to a change over time of the light receiving element, a change in sensitivity due to a temperature, or the like. Therefore, an object of the present invention is to provide a heating cooker that can reduce the information to be manually input by using light detection means and can finish foods irrespective of the accuracy of the light detection means. .

[Means for Solving the Problems]

When the present inventors irradiate light on food on a rotating turntable, the degree of change in the intensity of the reflected light changes according to the number of the food, and the reflected light is detected by light detection means. It has been noted that the number of foods can be detected regardless of the sensitivity and the resistance value of the light detection means by detecting the number of foods. The present invention has been made based on the above points of interest,
A first invention is a heating cooker having a turntable, heating means for heating a food placed on the turntable, and a light source for irradiating the food with light, the cooking being reflected by the food. Light detecting means for detecting light from the light source; determining means for determining the number of the foods based on a change in light intensity detected by the light detecting means during rotation of the turntable; and a determination result of the determining means Control means for controlling the heating time of the heating means based on the above. Further, a second invention is a heating cooker having a turntable, heating means for heating a food placed on the turntable, and a light source for irradiating the food with light, wherein the cooking is reflected by the food. Light detecting means for detecting the light from the light source, and a first number for determining the number of foods based on a change in light intensity detected by the light detecting means when the turntable is rotated.
Determining means; humidity detecting means for detecting the amount of water vapor generated by the food; second determining means for determining the type of the food based on the detection result of the humidity detecting means; determining the first determining means A control means for controlling the heating time of the heating means based on the result and the result of the judgment by the second judgment means is provided.

[Action]

In the first invention, the light detecting means detects light from the light source reflected by the food placed on the turntable, and the discriminating means detects the light based on a change in the light intensity detected by the light detecting means. Determine the number of foods. Then, the control means controls the heating time of the heating means based on the determination result of the determination means. The degree to which the intensity of light reflected by the food changes varies according to the number of the foods. Therefore, the determination means can calculate the degree of change in the light intensity from the detection result of the light detection means, and can determine the number of the foods based on the calculation result. The degree of change in the light intensity is not affected by the sensitivity or the resistance value of the light detection means. Therefore, the number of foods can be accurately detected. Therefore, it is not necessary to input the number of foods, and a good finish can be obtained with a small amount of input information. Further, in the second invention, the light detection unit detects light from the light source reflected by the food placed on the turntable, and the first determination unit determines the light based on the detection result of the light detection unit. Determine the amount of food. Further, the humidity detecting means detects the amount of water vapor generated by the food,
The determining means determines the type of the food based on the detection result of the humidity detecting means. Then, the control means controls the heating time of the heating means based on the determination result of the first determination means and the determination result of the second determination means. Therefore, as in the first invention, it is not necessary to input the number of foods, and it is not necessary to input the type of food, so that input information can be further reduced.

【Example】

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a schematic structural view of an embodiment of the cooking device of the present invention. In FIG. 1, 1 is a heating chamber, 2 is a turntable, 3 is a motor for rotating and driving the turntable, 4
Is an upper heater installed on the ceiling of the heating chamber 1, 5 is a lower heater installed on the bottom of the heating chamber 1, 6 is an exhaust duct, 7 is a humidity sensor installed in the exhaust duct 6, and 8 is The optical sensor 9 is a food (bread). The humidity sensor 7 detects the amount of water vapor generated by the food 9 and may be installed inside the heating chamber 1.
The optical sensor 8 detects light from an interior light (not shown) reflected by the food 9 and may be installed on the ceiling of the heating chamber 1. FIG. 2 is a circuit diagram of the cooking device. In this circuit diagram, an operation panel 11 has operation keys 12 such as a mode key for selecting a cooking mode such as “toast”. Reference numeral 13 denotes a microcomputer which amplifies a signal from a light detection circuit 20 including the optical sensor 8 and the resistor 14 and a signal from a bridge circuit including the humidity sensor 7 and the resistors 16 and 17. 1
The relay 15 is controlled in response to a signal from the humidity detection circuit 30 which is amplified by the control unit 8 to perform on / off control of the turntable motor 3, the upper heater 4, and the lower heater 5. . FIG. 3 is a flowchart showing the operation of the heating cooker when the food is bread. The heating time is changed depending on the type and number of bread. FIG. 4 is a diagram showing the output of the humidity detection circuit 30 when the food is a normal bread and a frozen bread. The humidity detection circuit 30 in the case of a normal bread is larger than the case of a frozen bread. Means that the output becomes larger. Also,
FIG. 5 is a diagram showing the output of the photodetector circuit 20 when the food is one loaf of bread and two loaves of bread. When the turntable 2 rotates, light is reflected by the loaf of bread, If this is not the case, the light detection circuit 20 clearly detects this, and from this, the number of breads can be determined. Hereinafter, the operation of the cooking device will be described with reference to the flowchart of FIG. First, in step S1, the toast key on the operation panel 11 is pressed to start heating. Then, in step S2, the microcomputer 13 turns on the relay 15, and supplies power to the heaters 4, 5 and the turntable motor 3. And
In step S3, detection by the humidity sensor 7 is started, and in step S4, detection by the optical sensor 8 is started. Next, read the peak value E ₁ output signal of the light detection circuit 20 in steps S5 S7, a turntable 2 which is stored in the ROM in advance microcomputer 13 to 1 time the rotating T ₀ (see FIG. 3) The output signal of the light detection circuit 20 has the peak value
Counts the number of times reaches E _1, stores the number N in the memory. Next, the humidity detecting circuit when the initial value V ₁ of the time of heating start of the output signal of the humidity detecting circuit 30 is stored in the memory, the process proceeds from step S9 to S10, the predetermined time T ₁ is elapsed in step S8 reading the output V ₂ of 30. The difference between the V ₂ and the V ₁ was a value determined by the amount of water vapor exiting from the bread after heating T ₁ times. Next, in step S11, the output V
Determine if ₂ is greater than V ₁ + ΔV. This Δ
V is a value obtained in advance by experiment and stored in the ROM. If V ₂ > V ₁ + ΔV, it is determined that the bread is ordinary bread, and the process proceeds from step S12 to S13. On the other hand, V ₂ > V ₁ +
If it is not ΔV, it is determined that the bread is a frozen bread, and steps S18 to S
Go to 19. In steps S13 and S19, it is determined whether the number N counted in step S6 is 1 or less. If it is 1 or less, it is determined that there is one loaf of bread. If it is not less than 1, it is determined that there are two loaves of bread. If there is one ordinary bread, step S14
From S15 to the heating time Tst, two ordinary bread
If it is a sheet, the process proceeds from step S16 to S17 to set the heating time to Ts
and t + α _1. Moreover, when frozen bread is one, and Tst + alpha ₂ and the heating time proceeds from step S20 to S21,
When frozen bread is two, and Tst + alpha ₃ the heating time proceeds from step S22 to step S23. As described above, the number of breads is determined based on the signal from the light detection circuit 20, and the type of the bread (normal bread or frozen bread) is determined based on the signal from the humidity detection circuit 30. Since the heating time is controlled on the basis of the result, it is not necessary to input the number and type of the bread with the operation keys, so that the input information is reduced, the operation is simple, and the input error is reduced. In addition, the light detection circuit 20
Since the number of breads is determined based on the number of peak values of the output signal of, regardless of the sensitivity or the resistance value of the optical sensor 8,
By detecting the number of breads with high accuracy, a good finish can be obtained. In the above embodiment, the case where bread is cooked has been described, but it goes without saying that the amount and type of food other than bread can be automatically detected and the heating time can be controlled in accordance with the detection result. .

[Effect of the invention]

As is clear from the above, in the cooking device of the first invention, the light detecting means detects the light from the light source reflected by the food placed on the turntable, and the discriminating means,
Since the number of the foods is determined based on the change in the light intensity detected by the light detection unit, and the control unit controls the heating time of the heating unit based on the determination result of the determination unit, There is no need to enter the number of foods, so
The input information is reduced, the operation is simple, the input error is reduced, and a good finish of the food can be obtained irrespective of the accuracy of the light detecting means. In the cooking device according to the second invention, the light detecting means detects light from the light source reflected by the food placed on the turntable, and the first determining means detects the light from the light detecting means. The number of the foods is determined based on the change in light intensity, the humidity detecting unit detects the amount of water vapor generated by the food, and the second determining unit determines the number of the foods based on the detection result of the humidity detecting unit. And the control means controls the heating time of the heating means based on the determination result of the first determination means and the determination result of the second determination means. In addition to the effect described above, there is no need to input the type of food, so that the input information can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the cooking device of the present invention, FIG. 2 is a circuit diagram of the above embodiment, FIG. 3 is a flowchart showing the operation of the above embodiment, and FIG. FIG. 5 is a diagram showing an output example of the humidity detection circuit in FIG. 5, and FIG. 5 is a diagram showing an output example of the light detection circuit in the above embodiment. DESCRIPTION OF SYMBOLS 1 ... Heating room, 2 ... Turntable, 4 ... Upper heater, 5
... lower heater, 7 ... humidity sensor, 8 ... optical sensor, 9 ... food, 11 ... operation panel, 12 ... operation keys, 13 ... microcomputer, 20 ... light detection circuit, 30 ... humidity detection circuit.

Claims (2)

(57) [Scope of request for utility model registration] 1. A heating cooker comprising a turntable, heating means for heating food placed on the turntable, and a light source for irradiating the food with light, wherein the cooker is reflected by the food. Light detection means for detecting light from a light source; determination means for determining the number of foods based on a change in light intensity detected by the light detection means when the turntable is rotated; and determination results of the determination means. Control means for controlling a heating time of the heating means based on the heating means. 2. A heating cooker having a turntable, heating means for heating food placed on the turntable, and a light source for irradiating the food with light, wherein the cooker is reflected by the food. Light detection means for detecting light from a light source; first determination means for determining the number of foods based on a change in light intensity detected by the light detection means during rotation of the turntable; Humidity detecting means for detecting the amount of water vapor; second determining means for determining the type of the food based on the detection result of the humidity detecting means; determination result of the first determining means and determination of the second determining means Control means for controlling the heating time of the heating means based on the result.