JPH05312332A - Heat-cooking apparatus - Google Patents

Abstract

PURPOSE:To have the cooking of foodstuffs finished in a good state in a short period of heating time by providing a control unit which judges whether a tray should be rotated according to the number of foodstuffs to be heated and which, in the case of a single foodstuff, positions the foodstuff automatically in the vicinity of heating means (electric heating units) whichever place on the tray the foodstuff may be set on. CONSTITUTION:The heat-cooking apparatus has electric heaters 3, 6, for heating foodstuffs to be heated in a heating chamber, a tray 8 on which the foodstuffs are set and which is provided rotatably, a drive motor 9 for rotatably driving the tray 8, a light source 4 for irradiating the foodstuffs with visible rays of light. A light- receiving element 11 is provided which receives the visible rays of light reflected by the foodstuffs irradiated from the light source 4 and which outputs detection signals corresponding to luminous intensity of the reflected light. A control unit is provided which judges the number of foodstuffs to be heated according to the detection signals from the light-receiving means 11 and controls heat-cooking in such a way that, in the case of a single foodstuff, the rotation of the tray 8 is stopped so as to position the foodstuff in the vicinity of the electric heaters 3, 6 and that, in the case of a plurality of foodstuffs, the tray 8 is rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating means for heating an object to be heated in a heating chamber, a rotatably mounted tray on which the object to be heated is placed, and a drive device for rotationally driving the tray. The present invention relates to a heating cooker consisting of.

[0002]

2. Description of the Related Art Conventionally, in a heating cooker such as an electric oven, a gas oven or a microwave oven with an electric heating device, when an object to be heated stored in a heating chamber is heated and browned, the object to be heated is placed on a saucer. There are two types, one is placed and heating is performed with the saucer fixed, and the other is that the saucer is rotatable and heated.

Particularly, in the case of performing high frequency heating, in many cases, the saucer is rotatable in order to uniformly perform high frequency heating, and in many cases, the saucer is also rotatable during heating by an electric heating device. In this case, for example, since the electric heating device for browning the bread is often provided at a position slightly off the center of the plane of the heating chamber, when two breads are placed on the saucer for heating. In the case where the saucer is fixed, the portion near the electric heating device is quickly browned, and the portion far from the electric heating device is hard to be browned, so that uniform cooking cannot be performed.

Further, in the case where the saucer is rotated and cooked, the two breads alternately pass in the vicinity of the electric heating device, so that the cooked food can be uniformly browned and excellently cooked.

[0005]

By the way, in the case of cooking such as toasting bread, it is preferable to make the surface of the bread brown in a short time so that the evaporation amount of water in the food can be suppressed to a small level. However, you can get a moist and tasty finish inside.

However, when only one loaf of bread is placed on the rotating saucer as described above, the heating time is longer than that when the saucer is fixed because the saucer is rotating. was there.

If the tray is fixed, it is necessary to place the bread in the vicinity of the electric heating device when placing it on the tray, and the finished state differs depending on the place where the bread is placed. There was a problem.

The present invention has been made in view of the above problems, and determines whether or not to rotate the saucer according to the number of objects to be heated, and in the case of a single object, places the object to be heated on the saucer. Even so, the object is to automatically position the heating means (electric heating device) in the vicinity thereof and obtain a good finished state in a short heating time.

[0009]

In order to achieve the above object, the heating cooker of the present invention is provided with a heating means for heating an object to be heated in a heating chamber, and the object to be heated is rotatably mounted. A provided saucer is provided, a drive device for rotationally driving the saucer is provided, and a light source for irradiating the object to be heated with visible light is provided,
A light receiving unit that receives visible light emitted from the light source and reflected by the object to be heated and outputs a detection signal according to the illuminance of this reflected light is provided, and the number of objects to be heated is detected by the detection signal from the light receiving unit. If there is only one, the saucer is stopped to position the object to be heated near the heating means, and if there is more than one, the saucer is rotated to perform heating and cooking.

Further, the control section for judging the cooking state of the object to be heated by the detection signal from the light receiving means and controlling the energization to the heating means is provided.

[0011]

In the above cooking device, the visible light emitted from the light source and reflected by the object to be heated is received by the light receiving means, and the number of the objects to be heated is judged by the detection signal from the light receiving means. In this case, the tray is stopped and the object to be heated is automatically positioned in the vicinity of the heating means, and the object to be heated is cooked in a short time.

Further, the cooking state of the object to be heated is judged from the detection result of the light receiving means, and the energization of the heating means is controlled to finish the object to be heated in a good cooking state.

[0013]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 is a perspective view of an inside of a microwave oven with a toaster function, which is a heating cooker according to the present invention, with an outer shell removed, FIG. 2 is a sectional view of FIG. 1 seen from the front, and FIG. It is sectional drawing which looked at 1 from the side surface.

In the microwave oven of the present invention, an electric heater 3, which is a heating means for heating an object to be heated, is provided on a ceiling 2 of a heating chamber 1 of a box made entirely of metal. 3, a light source 4 for irradiating an object to be heated with visible light, an electric heater 6 on the bottom plate 5 of the heating chamber 1, and a roller for placing the object to be heated on the bottom of the heating chamber 1. 7
The tray 8 having the above is rotatably provided, and the drive motor 9 for rotationally driving the tray 8 is provided. The tray 8 is formed in a mesh shape so that both sides of the object to be heated are charred when the object to be heated is cooked by the electric heaters 3 and 6.

A magnetron 10 is provided on the side wall of the heating chamber 1 for irradiating microwaves to the object to be heated on the pan 8 during microwave heating, and the object to be heated is reflected on the back side of the magnetron 10. The light receiving element 11 that receives the visible light and detects the illuminance of the visible light is provided.

FIG. 5 is a diagram showing the configuration of the above-mentioned microwave oven control device. The control unit 12 controls the electric heaters 3 and 6 and the drive motor 9, and the control unit 12 selects the type of cooking. And an operation unit 15 having a selection key 13 and a cooking start key 14, and the operation unit 15 and the light receiving element 11
And the control unit 12 are connected via the interface 16, the electric heaters 3 and 6 and the drive motor 9 are connected, and the electric heaters 3 and 6 and the drive motor 9 are connected by signals from the operation unit 15 and the light receiving element 11. The above-mentioned control part 12 controls and heats and cooks.

2 and 3, at the time of microwave heating by the magnetron 10, the tray 8 is constantly rotated by the drive motor 9 so that the object to be heated is uniformly heated by the microwave, so that the object is evenly heated. Heating.

On the other hand, when the electric heaters 3 and 6 are used for heating and cooking, for example, when one bread 17 is to be browned (toaster function), the door provided in the front of the heating chamber 1 is opened and the pan is received. Efficiently utilizing the heat of the electric heaters 3 and 6 by placing the bread 17 on 8 and rotating the pan 8 to position the bread 17 near the electric heaters 3 and 6 for cooking. Therefore, the bread 17 can be finished in a good condition in a short cooking time.

In order to position the loaf bread 17 in the vicinity of the electric heaters 3 and 6 as described above, it is necessary to detect the position of the loaf bread 17 by rotating the pan 8 at least once from the start of heating.

The position of the bread 17 is detected and the bread 1 is
In order to position 7 near the electric heaters 3 and 6,
The light receiving element 11 is arranged in the vicinity of the electric heater 3, and the light receiving element 11 detects the illuminance of visible light reflected by the bread 17 to detect the position of the bread 17. That is, the change in the illuminance of visible light reflected by the bread 17 is
The bread 17 becomes the largest when passing through the back side of the heating chamber 1 (in the vicinity of the electric heaters 3 and 6), and conversely, the heating chamber 1
The position of the loaf bread 17 can be detected by detecting the illuminance of the visible light that is the smallest when passing through the front side (positions apart from the electric heaters 3 and 6).

FIG. 6 shows a circuit in which cadmium sulfide CdS, which is a photoconductive element having a smaller resistance value as the illuminance received is brighter, is used as the above-mentioned light receiving element 11.
This circuit has a resistor R1 and the other end of CdS11 whose one end is grounded.
Are connected in series, and the voltage Vc is applied to the other end of the resistor R1. The other end of the CdS 11 is connected to the input port An of the control unit 12 (the interface 13 is omitted) via the filter 18 including the resistor R2 and the capacitor C2. Therefore, if the resistance value Rc of the CdS 11 decreases, the input voltage to the control unit 12 decreases accordingly.

FIG. 7 is a voltage characteristic diagram showing changes in the input voltage to the control unit 12 when the pan 17 is placed on the pan 8 and the pan 8 is rotated. At the same time, this input voltage changes to the maximum point A and the minimum point B. By using a synchronous motor as the drive motor 9 for rotating the tray 8, the number of rotations can be determined in synchronization with the power supply frequency, and the time required for rotating the tray 8 once can be made constant. . That is, when the input voltage is at the minimum point B, the position of the loaf of bread 17 passes through the vicinity of the electric heaters 3 and 6, and the drive motor 9 is stopped after a certain period of time from when the minimum point B was input. As a result, the bread 17 can be stopped near the electric heaters 3 and 6.

As described above, when the bread 17 is heated and cooked, the pan 8 is first rotated once to receive the light receiving element (CdS).
The position of the loaf bread 17 is detected by the input voltage (detection signal) from 11 to the control section 12, and the loaf motor 9 is stopped after a predetermined time from when this input voltage detects the minimum point B, so that the loaf bread 17 is automatically made. It can be stopped at a position near the electric heaters 3 and 6, and the electric heaters 3 and 6 perform cooking at this position.

When the cooking is advanced by the electric heaters 3 and 6, the surface of the bread 17 is burnt, so that the illuminance of the visible light received by the light receiving element 11 becomes dark, and the input voltage to the control unit 12 is reduced. Changes and this input voltage rises as the surface of the loaf bread 17 is browned, and this input voltage is detected to detect the finished state of the loaf bread 17 to control the power supply to the electric heaters 3 and 6, The bread 17 can be cooked by heating to a good finish.

When the two breads 17 are placed on the tray 8 and heating and cooking are started, the input voltage input to the control unit 12 during the one rotation of the tray 8 becomes the minimum point B twice. As described above, when there is a plurality of input voltages that become the minimum point B during one rotation of the pan 8, the control unit 1
2 determines that the plurality of breads 17 have been placed on the saucer 8 and drives the drive motor 9 until the heating and cooking are completed.
The bread 17 is heated and cooked while rotating.

In the above embodiment, the light source 4 is connected to the ceiling 2 of the heating chamber 1.
Although it may be provided on the bottom plate 5 of the heating chamber 1 as shown in FIGS. 8 and 9, when the light source 4 is provided on the bottom plate 5, the detection result of the light receiving element 11 indicates that the tray 8 is Since the bread 17 is formed in a mesh shape, visible light is blocked by the bread 17 at the portion where the bread 17 is located as shown in FIG. Since visible light is blocked by the mesh-shaped tray 8 in the part, it is repeatedly turned on and off. When the bread 17 is one, the signal is as shown in FIG. 10, and when a plurality of breads 17 are placed. Shows that the visible light from the light source 4 is blocked by the bread 17 for a long time, and it is possible to determine whether the bread 17 is single or plural by the time when the visible light is blocked, and the tray 8 is stopped based on this determination result. Or cook it Performing cooked only dish 8 determines whether to cooked while being rotated.

[0028]

EFFECT OF THE INVENTION Since the heating cooker of the present invention is constructed as described above, it is possible to perform heating and cooking according to the number of objects to be heated. When the number of objects to be heated is one, the objects to be heated are automatically heated. It can be located near the heating means, and a good finished state can be obtained in a short heating time.

Further, the light receiving means for detecting the position of the object to be heated can be used to detect the finished state of the object to be heated, and good cooking can be performed easily with a small number of parts.

[Brief description of drawings]

FIG. 1 is an internal perspective view showing an embodiment of a heating cooker of the present invention.

FIG. 2 is a cross-sectional view of the heating cooker according to the present invention as viewed from the front.

FIG. 3 is a cross-sectional view of a heating cooker according to the present invention as seen from a side surface.

FIG. 4 is a plan view showing a pan 8 of the heating cooker according to the present invention.

FIG. 5 is a circuit diagram showing a controller of the heating cooker according to the present invention.

FIG. 6 is a main part circuit diagram showing a light receiving element 11 of the heating cooker according to the present invention.

FIG. 7 is a voltage characteristic diagram showing an input voltage to the control unit 12 of the heating cooker according to the present invention.

FIG. 8 is a cross-sectional view of a heating cooker according to another embodiment of the present invention as seen from the front.

FIG. 9 is a cross-sectional view of a heating cooker according to another embodiment of the present invention as seen from the side surface.

FIG. 10 is a characteristic diagram showing a detection signal of the light receiving element 11 of the heating cooker according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 heating chamber 3 electric heater 4 light source 6 electric heater 8 saucer 9 drive motor 11 light receiving element 12 control unit

Claims (2)

[Claims] 1. A heating cooker comprising: heating means for heating an object to be heated in a heating chamber; a rotatably provided tray on which the object to be heated is placed; and a drive device for rotationally driving the tray. A light source that irradiates the object to be heated with visible light, and a light receiving unit that receives visible light emitted from the light source and reflected by the object to be heated, and outputs a detection signal corresponding to the illuminance of the reflected light, The number of objects to be heated is judged from the detection signal from the light receiving means. When the number is one, the saucer is stopped and the objects to be heated are positioned in the vicinity of the heating means. A heating cooker characterized by being provided with a control section for performing. 2. The heating cooker according to claim 1, further comprising: the control section for determining a cooking state of the object to be heated by a detection signal from the light receiving means and controlling energization to the heating means. Cooker to cook.