JPS6037694A - Electronic range - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to microwave ovens, and particularly to a microwave oven equipped with an infrared sensor that is safe from misuse and does not involve risks such as no-load oscillation.

[Technical background of the invention]

In recent years, microwave ovens that use infrared sensors have come into widespread use for automatic cooking purposes. FIG. 1 is a block diagram showing an example of such a conventional microwave oven. Above the bottom plate 2 of the oven L is a shelf board 3.
is provided, and the food to be heated is placed on this shelf board 3.

An infrared sensor 1 is attached to the wall above the oven 1, and the heating state of the object placed on the shelf board 3 is monitored by this infrared sensor 1.

The heat radiated from the object to be heated is transmitted to the infrared edge sensor intermittently by the heat exchanger j, and is transmitted to the infrared sensor unit B as a signal indicating the heating state. The infrared sensor unit has a built-in function that outputs a control signal according to the heating state to the electronic controller 7. Based on this control signal, the electronic controller 7 outputs a magnetron to heat the object. By varying the firing rate mt, the object to be heated is heated to a desired thermal state. This infrared sensor sensor has a desired viewing range on the shelf board 3, and the object to be heated must be placed within this viewing range.

[Problems with background technology]

In this way, a microwave oven that uses infrared rays to monitor the heating state of an object placed within its viewing range while cooking can cook automatically as long as the object is within its viewing range z. It is. However, since the field of view 2 of the infrared sensor≠ is extremely limited, it happens that ′-1:
If the object to be heated is placed outside the field of view, the infrared edge sensor can no longer perform its function. Since this viewing range is unknown to the user, a method such as displaying the entire range on the shelf board 3 with a light source provided separately is used.1. ing.

However, all of these methods serve only as a reminder to the user to properly place the object to be heated, and even if the user were to place the object outside of their field of vision. Q: Is there anything that can prevent the microwave oven from operating without any load, without heating the object to be heated? If the microwave oven is operated in such a condition, the infrared sensor≠ will operate the magnetron g fully while detecting the temperature of the shelf board 3.
If the cooking J1 was not done properly or properly, or l;] In the bad case, the microwave oven itself would be destroyed, which would be a disadvantage. Also, even if the originally necessary shelf board 3 is removed for some reason, the conventional jj;
1. J\- does not have a function to notify the user of this, so it also has the disadvantage of inviting misuse. If there is no object to be heated within the field of view of the infrared sensor, or if a shelf board that is originally required has been removed, the user will be notified and heat treatment will be prohibited. Function f
f: The purpose is to provide a microwave oven.

[Synopsis of the invention]

In order to achieve the above object ([-), the object to be heated is placed within a desired viewing range within a shelf board above the open bottom plate, and an infrared sensor having the said viewing range is used to In a microwave oven that cooks food while monitoring the heating state of an object, a color sensor that shares the viewing range and outputs a signal corresponding to the color of an object existing within the viewing range; The oven bottom plate fC is characterized in that it is provided with means for displaying a desired display and prohibiting heat treatment when a signal corresponding to the color of the shelf board is output.

[Embodiments of the invention]

Embodiments of this invention will be explained in detail below based on all the drawings. Figures 2 and 2 show an embodiment of this invention.
FIG. Note that the same parts as shown in FIG. 1 are designated by the same reference numerals throughout, and their explanation will be omitted.

What makes it different from a conventional microwave oven is that it has a color sensor lO that can detect the color of objects within its field of view.
The difference lies in that a color sensor unit // is provided which outputs a desired control signal to the all-electronic controller 7 in response to the color signal from the color sensor 10. What is the viewing range of the color sensor 10 for the infrared edge sensor? [So that the field of view is the same as [dl]. The color sensor 10 and the color sensor unit // are provided to determine whether an object to be heated is placed within the viewing range 2 and to determine whether or not there is a shelf board 3. ing.

FIG. 3 is a circuit diagram C showing details of the color sensor unit K1Cl. The color sensor 10 includes a photodiode/QEL having sensitivity to blue colors and a photodiode 10b having sensitivity to red colors. :(7
) and is recognized as the degree of mixing of the incident light tW and the color red. Photodiode lOa
and 10b, the incident light is converted into a current representing a present signal and a red signal by a current amplifier //PL, respectively.
The signal is amplified by //b, converted into a voltage signal, and input to adder //C. The output signal of adder /IC is a color signal, and its magnitude corresponds to each color. This color signal is applied to the gain adjuster 1ir3. via A/D converter/
/θ, converted into a digital signal, and supplied to the electronic controller 7.

In this way, the color sensor unit//I-) is supplied to the electronic controller 7. 1.1 is a signal representing the color of the object existing within the visual field, and is heated within this visual field. When the object is properly placed, a signal corresponding to the color of the object to be heated is output.

However, if the object to be heated is not properly placed within the viewing range, the color of the shelf board 3 will be detected and a signal corresponding to this color will be output. Furthermore, if the shelf board 3 is removed for some reason, the bottom plate of the oven is detected, and a signal corresponding to the color of the bottom plate λ is output. The electronic controller 7 receives signals corresponding to these colors and controls the microwave oven according to the colors. In other words, if the signal from the color sensor unit// is a signal representing the object to be heated, the Madanetron, r
1 control to process the object to be heated. If the signal from the color sensor unit // is a signal indicating the bottom plate 2 of the oven, it is determined that the shelf board 3 has been removed, and a display is made to the effect that there is no shelf board in the oven. At the same time, heat treatment of magnetron g is prohibited. In addition, if the signal from the color sensor unit // is a signal representing the color of the shelf board 3, it is determined that there is no object to be heated within the visual field, and a display to that effect is performed, and the heating process is performed. prohibited.

In this way, when a signal corresponding to the color of the oven bottom plate or shelf board is output, a message to that effect is displayed and heating processing is prohibited, which prevents the microwave from being used incorrectly. The figure is a flowchart showing the function of the discrimination process for determining what kind of object is present within the field of view described above. This function can be easily realized by incorporating a microcomputer into the electronic controller 7.

First, prior to the determination process, it is determined whether or not the determination process has already been performed, and if the determination process has already been performed, the process advances to NEXT/ to enter the cooking execution process. If the discrimination process has not been performed, the process enters the discrimination process step. ~4 The converted color signal is sent to the color sensor unit //
ff: It is determined whether this color signal is the color of the bottom plate of the oven. If this color signal is a signal representing the bottom plate of the oven, it is determined that the shelf board 3 has been removed, and a display indicating that there is no shelf board in the oven is performed as a no-load abnormality display process. Then, the oscillation of the magnetron r is prohibited and a process is performed in which heating is not performed, and then the process proceeds to NEXTλ.

- If the signal does not represent the bottom plate of the bun, it is determined whether it is the color of the shelf board 3 or not.

If it is the color of shelf board 3, the food to be heated may have shifted its position and not be properly placed within the viewing range, or in some cases, the food to be heated may not be present. After making a judgment and processing to display that effect, and then processing to prohibit transmission to the magnetron,
11 Proceed to step 2.

In order to carry out these 1" and 4" separate processes, a signal indicating the color of the food that is mixed with the oven bottom plate λ and the shelf board 3 or the object to be heated is stored in advance in the electronic controller 7, and the color sensor unit/ The determination process can be easily performed by comparing the signal from / with this stored signal and determining whether or not they match.

sL> is a flowchart illustrating the operating procedure of a microwave oven in which a microcomputer is incorporated in the electronic controller 7. When the microwave oven is turned on, the micro-+ so f x -s in the electronic controller 7
σ) Tongue 1+0+-AZnWirh l jnl1 Mouth addition T
'll -/l (7〉? IP will be delivered.

Initial processing refers to setting initial values in the memory in the microconbeater and setting the infrared wavelength control unit and color sensor unit to the initial state. Next, if the microwave oven has the key power to perform a predetermined process, the key process is performed according to the key power to make ice, and if there is no key power, the key is used to determine whether or not to start cooking. 4) Perform the determination. In the case of starting cooking, the determination process explained in the flowchart of FIG. 7 is performed, and based on the result, the NEXT
In the case of /, the cooking execution process is performed, and in the case of N JB determines that it is impossible to perform cooking, and performs texture finishing processing. If the number of abnormality detections does not exceed a predetermined number of times, the determination process is repeated again. In this manner, when the "J process" or "cooking completion process" is performed, a message to that effect is displayed, and then the state returns to the state after the "start again" process.

[C Effects of the Invention] As explained in detail 11c'' and !δ based on the above embodiments.

In this invention, there is no heated iron in the area around the infrared sensor.
Since the persimmons are placed at 7L so that it can be automatically determined whether or not there is a single dish, an automatic cooking party can be carried out without causing any trouble. There are many advantages. - If the object to be heated is not placed in the correct position, or if the object to be heated is
(electronic lens)'f1 in the state without L, that is, in the no-load state
: There is also the advantage that being able to get pregnant through manipulation makes you feel better. Furthermore, malfunctions can be prevented if the microwave oven is operated without the required shelves installed.

[Brief explanation of drawings]

The first opening is a loading block diagram of a conventional microwave oven, and Figure 2 is a 1X4 block diagram of a microwave oven according to the present invention.
Figure rJj is a circuit diagram showing details of the color sensor unit used in this invention, i1! FIG. 5 is a flowchart showing the flow of the discrimination process according to the present invention, and FIG. 5 is a flowchart showing the operating procedure of the microwave oven. 2\...Oven bottom plate, 3...Shelf board, Hiroshi...Infrared sensor, 2...Infrared sensor unit, 7...
Electronic controller, ri... viewing range, lo... color sensor, /1... color sensor unit. Applicant's representative Kiyoshi Inomata Figure 1 Figure 2

Claims (1)

[Claims] (1) Place the object to be heated within a desired viewing range on a shelf above the oven bottom plate, and cook while monitoring the heating state of the object using an infrared sensor having the above-mentioned viewing range. In a microwave oven, a color sensor that shares the viewing range and outputs a signal corresponding to the color of an object existing within the viewing range; What is claimed is: 1. A microwave oven characterized in that it is provided with means for displaying a desired display and prohibiting heating processing when a signal is outputted. (, 2j) If the bone is a signal corresponding to the color of the oven bottom plate, an indication that the shelf board is not present in the oven is displayed. (34) If the signal is a signal corresponding to the color of the shelf board, a display indicating that the object to be heated is outside the viewing range is provided. Microwave oven as described in section.