JP6960350B2 - Cooker - Google Patents

Description

The present invention relates to a cooker, particularly a cooker that heats an object to be heated placed on a top plate.

Conventionally, in a heating cooker in which an object to be heated such as a pot or a frying pan is placed at a predetermined heating position on a top plate and heated by a heating means, a pot bottom temperature sensor erected at the heating position moves up and down. It is known that it is provided with a pot detection sensor that turns on and off according to the above, and is configured to detect whether or not an object to be heated is placed at the heating position based on the on / off information of the pot detection sensor. (See, for example, Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 2016-8722 Japanese Unexamined Patent Publication No. 2000-291958 Japanese Unexamined Patent Publication No. 8-86445

This type of cooking cooker limits the output of the heating means to a certain level or less when the object to be heated is removed from the heating position, or the output of the heating means when the object to be heated is not placed at the heating position. It has a function to prohibit. However, in the above-mentioned conventional cooking cooker, if the pot bottom temperature sensor does not move up and down normally due to deformation of moving parts or adhered dirt, it is not possible to accurately detect the placement or removal of the object to be heated, and the output of the heating means is output. However, there is a risk that it will not be properly controlled depending on the placement or removal of the object to be heated.

The present invention has been made in view of the above problems, and an object of the present invention is to provide operational stability in a cooking device having a function of controlling the output of a heating means according to the placement or removal of an object to be heated. It is to improve.

The present invention is a heating cooker including a top plate constituting an upper surface portion of an instrument body and a plurality of heating means for heating an object to be heated placed at a predetermined heating position on the top plate. A plurality of object detecting means provided on the lower surface side of the translucent portion provided on the top plate to detect the movement of an object on the top plate, and a control for controlling the output of the heating means according to the detection result of the object detecting means. The object detection means includes a light emitting means that emits the detected light onto the top plate through the translucent portion, and a light receiving means that receives the detected light that is reflected by the object on the top plate and returned through the transmissive portion. The control means determines which heating means corresponds to the heating position on which the object to be heated is placed, based on the degree to which the light receiving level of the detection light by each object detection means changes from the reference level. It is equipped with a mounting determination means.

In the above-mentioned cooking cooker, light emission and reception of the detection light by the object detection means are performed through a translucent portion provided on the top plate. Therefore, if the top plate is bent by the weight of the object to be heated placed on the top plate and the distance between the object detecting means and the translucent portion fluctuates, the light receiving level of the detected light by the object detecting means fluctuates. Therefore, in the present invention, the placement or removal of the object to be heated at each heating position is detected based on the degree of change in the light receiving level of the detection light by the plurality of object detection means. As a result, unlike the conventional cooking cooker described above, there is no risk of failing to detect the placement or removal of the object to be heated due to deformation of moving parts or adhesion stains, so that the heating position is set to a predetermined position on the top plate. It is possible to accurately detect whether or not the object to be heated is placed.

Preferably, in the above-mentioned cooking cooker, the placement determination means is a state in which the object to be heated is placed at the heating position when the fluctuation state in which the light receiving level changes from the reference level by a predetermined level or more continues for a predetermined time or more. Is determined.

The light receiving level of the detected light by the object detecting means also changes when an object to be heated or an object such as a user's hand moves in the space above the top plate. Therefore, in the above-mentioned cooking cooker, if the state in which the light receiving level changes from the reference level by a predetermined level or more (fluctuation state) continues for a predetermined time or more, it is not determined that the object has moved above the top plate, but on the top plate. It is determined that the object to be heated is placed. This makes it possible to more accurately detect whether or not the object to be heated is placed at a predetermined heating position on the top plate.

Preferably, in the cooking utensil, the control means includes an operation instruction discriminating means for discriminating the change information of the light receiving level of the detected light by each object detecting means as an operation instruction of the appliance.

In this product, in addition to placing and removing the object to be heated at each heating position on the top plate, approaching the user's hand and clothes to each heating position, and the user's hand corresponding to the operation instruction of the cooking cooker. Since the movement of the above can be detected by using a common object detection means, it is possible to simplify the overall structure.

Preferably, in the cooking cooker, the control means includes a reference correction means for correcting the reference level when the placement or removal of the object to be heated at the heating position is detected.

As described above, the light receiving level of the light detected by the object detection means varies depending on whether or not the object to be heated is placed on the top plate. Therefore, even though the object to be heated is placed on the top plate, the degree of change in the light receiving level should be determined based on the reference level when the object to be heated is not placed on the top plate. For example, it may not be possible to accurately detect the movement of an object on the top plate, such as the approach of the user's hand or clothes to each heating position, or the movement of the user's hand corresponding to the operation instruction of the cooking cooker. However, according to the present invention, the reference level is corrected according to the placement or removal of the object to be heated, and the degree of change in the light receiving level can be determined based on the corrected reference level. It is possible to accurately detect the movement of the object above.

As described above, according to the present invention, it is possible to accurately detect whether or not the object to be heated is placed at a predetermined heating position on the top plate, so that the output of the heating means is appropriate according to the detection result. It can be controlled to improve the operation stability.

FIG. 1 is a schematic perspective view of a cooking cooker according to an embodiment of the present invention. FIG. 2 is a schematic upward view of the cooking cooker according to the embodiment of the present invention. FIG. 3 is a schematic configuration diagram of a cooking cooker according to an embodiment of the present invention. FIG. 4 is a schematic configuration diagram of an object detection sensor of a cooking device according to an embodiment of the present invention. FIG. 5 is a table showing the relationship between the distance from the object detection sensor and the light receiving level with respect to the object in the cooking device according to the embodiment of the present invention.

Next, the above-described embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the cooking cooker 1 according to the embodiment of the present invention is a so-called built-in stove, which is installed in a drop-in state at a mounting port 40 provided in a counter top 4 of a kitchen, and is an appliance. A plurality of (here, three) stove burners 21A, 21B, and 21C are arranged as heating means on the upper surface side of the top plate 11 forming the upper surface portion of the main body 10.

On the side surface portion (hereinafter, referred to as “front surface”) 12 of the appliance main body 10 facing the leading edge portion 41 side of the counter top 4, a power switch 13 for turning on / off the power of the cooking cooker 1 and each of the above stoves Point fire extinguishing operators 14A, 14B, 14C for igniting, extinguishing, and switching the thermal power of the burners 21A, 21B, and 21C are provided (see FIGS. 1 and 3). In the present specification, the front surface 12 of the main body is the front surface of the cooking cooker 1, the depth direction when the main body 10 is viewed from the front surface 12 side of the main body is the front-rear direction, the width direction is the left-right direction, and the height direction is the up-down direction. That is.

In the present embodiment, a standard thermal power stove burner (hereinafter, also referred to as “left burner”) 21A is arranged at a position closer to the left front of the top plate 11, and is maximum at a position closer to the right front of the top plate 11 than the standard burner 21A. A large-heated stove burner (hereinafter, also referred to as "right burner") 21B having a large thermal power is arranged, and a small-heated stove burner (hereinafter, also referred to as "right burner") having a smaller maximum thermal power than the left burner 21A is located near the center of the top plate 11. 21C (also referred to as "rear burner") is arranged. Each of the control burners 21A, 21B, and 21C is configured to be supplied with fuel gas via a valve unit 20 (see FIG. 3) incorporated in the instrument body 10 and burn a mixed gas of the fuel gas and air. ing.

At the arrangement positions of the stove burners 21A, 21B, and 21C on the upper surface of the top plate 11, the trivet 15 that supports the object to be heated (hereinafter referred to as "cooking tool") 5 such as a pot or a frying pan is placed. There is.

At the center of the stove burners 21A, 21B, 21C, pot bottom temperature sensors 22A, 22B, 22C that come into contact with the bottom of the cooking utensil 5 placed on the trivet 15 and detect the temperature state of the cooking utensil 5 are erected. Has been done. On the outside of the flame hole (not shown) provided on the outer periphery of the stove burners 21A, 21B, 21C, there is a spark plug 23 that discharges sparks around the flame hole, and a flame detection sensor that detects the presence or absence of a combustion flame on the outside of the flame hole. 24A, 24B, 24C are provided.

A display panel 26 for displaying the operating state and setting information of the cooking utensil 1 is incorporated at a position near the center of the lower surface side of the top plate 11 in the utensil main body 10. The top plate 11 is formed of a glass plate having high heat resistance and impact resistance, and the display panel 26 is a translucent portion for display provided at a position near the center of the top plate 11 (hereinafter, “display”. It is arranged so as to face the window (referred to as "window") 16 from the lower surface side.

Predetermined areas on the top plate 11 (here, left burner 21A and right burner 21B, respectively) are located at the lower left front position, the right front position, and the center front position of the top plate 11 in the instrument body 10. Object detection sensors 27A, 27B, 27C for detecting the movement of an object T such as a user's hand or clothes in the space in front of the user by infrared rays are provided.

The object detection sensor on the left side (hereinafter, also referred to as “left object detection sensor”) 27A is attached to the light transmitting portion (hereinafter, “light receiving / emitting window”) 17A for the sensor provided at a position closer to the left front of the top plate 11. The object detection sensor 27B on the right side (hereinafter, also referred to as “right object detection sensor”) 27B, which is arranged facing from the lower surface side, is provided from the lower surface side to the light emitting / receiving window 17B provided at a position closer to the right front of the top plate 11. They are arranged to face each other. The central object detection sensor (hereinafter, also referred to as “central object detection sensor”) 27C is disposed together with the display panel 26 so as to face the display window 16 from below.

Solenoid valve of valve unit 20, power switch 13, switch mechanism of point fire extinguishing actuators 14A, 14B, 14C, igniter that applies high voltage to ignition plug 23, pot bottom temperature sensor 22A, 22B, 22C, flame detection sensor 24A, The 24B, 24C, the display panel 26, and the object detection sensors 27A, 27B, 27C are all wiredly connected to the main control circuit 3 incorporated inside the instrument main body 10 (see FIG. 3).

As shown in FIG. 4, the object detection sensors 27A, 27B, 27C transmit the detection light for detecting the movement of the object T (hereinafter, referred to as “infrared detection light”) to the corresponding translucent unit (display window 16 or The infrared light emitting unit 271 as a light emitting means that emits light to the predetermined region through the light receiving / emitting windows 17A, 17B) and the light transmitting unit (display window 16 or the light emitting / receiving windows 17A, 17B) corresponding to the infrared detection light reflected on the object T. It is provided with an infrared light receiving unit 272 as a light receiving means for receiving light through the light. That is, the object detection sensors 27A, 27B, and 27C include a pair of infrared light emitting units 271 and an infrared light receiving unit 272.

The main control circuit 3 includes a power supply control unit 301 that controls the power on / off of the cooking cooker 1 in response to a power on / off operation by the power switch 13, and an ignition operation or fire extinguishing operation by the point fire extinguishing operators 14A, 14B, 14C. Corresponding stove burners 21A, 21B, 21C based on the output values of the burner control unit 302 and the flame detection sensors 24A, 24B, 24C that control the thermal power of the stove burners 21A, 21B, 21C according to the operation, switching operation of the thermal power, etc. It is provided with a circuit configuration such as a point fire extinguishing determination unit 303 for determining ignition or fire extinguishing, and an operation setting unit (not shown) for selecting and setting an operation mode of the cooking cooker 1 from a plurality of modes.

Further, the main control circuit 3 has a degree of change (change amount) from the set reference level of the infrared detection light received by the light emitting control unit 311 and the infrared light receiving unit 272 that output a constant infrared detection light from the infrared light emitting unit 271. ), The fluctuation determination unit 312 that determines the movement of the object T on the top plate 11, and any of the infrared detection light received by the object detection sensors 27A, 27B, and 27C based on the degree of change from the reference level. Placement determination unit 313 as a placement determination means for determining whether the cooking utensil 5 is placed at the heating position corresponding to the stove burners 21A, 21B, 21C, turning on the power and igniting the stove burners 21A, 21B, 21C. An operating state monitoring unit 314 that monitors whether or not the operating state of the cooking utensil 1 satisfies a predetermined condition such as mounting and removal of the cooking utensil 5, and a reference correction means that corrects the reference level when the predetermined condition is satisfied. It is provided with a circuit configuration such as a reference correction unit 315.

The fluctuation determination unit 312 has an approach determination function for determining whether or not an object T such as a user's hand or clothes has approached the predetermined area to a predetermined limit distance based on the degree of change in the light receiving level, and a stove burner. As an operation instruction of the cooking cooker 1 such as extinguishing fires of 21A, 21B, and 21C and switching the operation mode, a gesture operation discrimination function for discriminating the movement of the user's hand (movement of the object T) in a predetermined area on the top plate 11 is provided. Have. That is, the fluctuation determination unit 312 corresponds to the operation instruction determination means of the present invention.

The burner control unit 302 has an output limiting function that limits the thermal power of the corresponding left burner 21A or right burner 21B when the fluctuation determination unit 312 determines that the object T has approached the predetermined area to a predetermined limit distance. Have.

An example of the change in the light receiving level of the infrared detection light by the object detection sensors 27A, 27B, and 27C will be described with reference to FIGS. 4 and 5.

When the power of the heating cooker 1 is turned on by the power switch 13, the cooking utensil 5 is not placed on any of the trivets 15, and the object T does not approach the predetermined area, that is, Under the normal state before use (hereinafter referred to as "standard state without pot"), the light receiving level of the infrared detection light in the object detection sensors 27A, 27B, 27C shows "19600", respectively, and the operation state monitoring unit 314. Causes the reference correction unit 315 to set this value as the reference level of each object detection sensor 27A, 27B, 27C.

In the standard state without a pot, for example, if an object T such as a user's hand or clothes approaches a distance of about "20 cm" above the left object detection sensor 27A, the light receiving level of the left object detection sensor 27A is "20300". Ascend to. That is, the light receiving level rises by "700" from the standard state without a pan.

After that, when the object T approaches a distance of about "15 cm" above the left object detection sensor 27A, the light receiving level of the left object detection sensor 27A rises to "21500". That is, the light receiving level further increases by "1200" from the time when the distance from the object T is 20 cm.

Further, when the object T approaches a distance of about "10 cm" above the left object detection sensor 27A, the light receiving level of the left object detection sensor 27A rises to "24000". That is, the light receiving level further increases by "2500" from the time when the distance from the object T is 15 cm.

If the light receiving level of the object detection sensors 27A, 27B, 27C rises by "4400" or more from the reference level, the fluctuation determination unit 312 reaches a limit distance (here, 10 cm) with respect to the corresponding left burner 21A or right burner 21B. Assuming that the object T is approaching, the burner control unit 302 is made to limit the thermal power of the left burner 21A or the right burner 21B to a certain level or less (here, the fire is maintained in a fire extinguishing state). Therefore, in the above-mentioned cooking cooker 1, when the light receiving level of the left object detection sensor 27A rises by "4400" or more from the reference level after the power is turned on, the point fire extinguishing operator 14A corresponding to the left burner 21A is used. Even if the ignition operation is performed, the left burner 21A is not ignited and is maintained in a fire extinguishing state. When the light receiving level of the right object detection sensor 27B rises by "4400" or more from the reference level, the ignition of the right burner 21B is restricted, and the light receiving level of the central object detection sensor 27C rises by "4400" or more from the reference level. In this case, the ignition of both the right burner 21A and the left burner 21B is limited.

After the power of the cooking cooker 1 is turned on, the ignition operation is performed by the point fire extinguishing actuators 14A, 14B, 14C, and when any of the control burners 21A, 21B, 21C is ignited, the operation state monitoring unit 314 , The reference correction unit 315 is made to set the light receiving level of the object detection sensors 27A, 27B, 27C at that time as the reference level of each object detection sensor 27A, 27B, 27C, respectively. That is, in the above-mentioned cooking cooker 1, when the ignition of the left burner 21A is detected by the flame detection sensor 24A in the standard state without a pan, the light receiving level of the object detection sensors 27A, 27B, 27C at that time is ". "19600" is set as a reference level for each of the object detection sensors 27A, 27B, and 27C, respectively.

Then, as described above, for example, after the left burner 21A is ignited, if the light receiving level of the left object detection sensor 27A rises by "4400" or more from the reference level, the fluctuation determination unit 312 indicates that the object T is relative to the left burner 21A. The left burner 21A is automatically extinguished by the burner control unit 302 on the assumption that the distance is approached to the limit distance (10 cm in this case).

In the above-mentioned cooking cooker 1, the stove burners 21A, 21B, 21C are ignited if the ignition operation is performed by the point fire extinguishing actuators 14A, 14B, 14C even in the standard state without a pot. The light receiving level of is reset as a reference level, but when the ignition operation is performed by the point fire extinguishing actuators 14A, 14B, 14C, the ignition operated stove burners 21A, 21B, 21C When the heating position corresponding to is the standard state without a pot, the stove burners 21A, 21B, and 21C may not be ignited, and the reference level at the time of ignition may not be reset as described above.

Although not shown, after the heating cooker 1 is turned on, in the standard state without a pan, for example, the left object detection sensor 27A and the right object detection sensor 27B are each above a predetermined distance (for example, about “5 cm”). When the user's hand (object T) is brought closer to the following, the light receiving level of both the left object detection sensor 27A and the right object detection sensor 27B rises by "10000" or more from the reference level. On the other hand, the light receiving level of the central object detection sensor 27C hardly fluctuates from the reference level.

Therefore, in the fluctuation determination unit 312, the light receiving levels of the left object detection sensor 27A and the right object detection sensor 27B both increase by "10000" or more from the reference level while the power of the cooking cooker 1 is turned on, and If the light receiving level of the central object detection sensor 27C continues to be substantially the same as the reference level for a predetermined time or longer (for example, 5 seconds or longer), the mode is switched to the vendor setting mode that enables various initial settings of the cooking cooker 1. Is instructed, the operation setting unit (not shown) of the main control circuit 3 is made to switch the operation mode of the cooking cooker 1 to the trader setting mode.

Further, as described above, after any of the control burners 21A, 21B, 21C is ignited, the user's hand (object T) is up to a predetermined distance (for example, about "5 cm") or less above the central object detection sensor 27C. When is brought closer, the light receiving level of the central object detection sensor 27C rises by "10000" or more from the reference level. On the other hand, the light receiving levels of the left object detection sensor 27A and the right object detection sensor 27B hardly change from the reference level.

Therefore, if at least one of the stove burners 21A, 21B, and 21C is ignited and only the light receiving level of the central object detection sensor 27C rises by "10000" or more from the reference level, the fluctuation determination unit 312 raises the stove burner 21A. , 21B, 21C are instructed to extinguish, and the burner control unit 302 is forced to extinguish all the burning stoves 21A, 21B, 21C.

After the power of the cooking utensil 1 is turned on, in the standard state without a pan, for example, when the cooking utensil 5 is placed on the trivet 15 of the left burner 21A, due to the weight of the cooking utensil 5, especially the left side. The degree of bending of the top plate 11 in the upper region of the object detection sensor 27A increases, and the distance between the left object detection sensor 27A and the light emitting / receiving window 17A of the top plate 11 fluctuates. As a result, the reflection direction and the refraction direction of the infrared detection light emitted from the infrared light emitting unit 271 change in a direction different from that in the standard state without a pan, and the light receiving level of the infrared detection light in the infrared light receiving unit 272 becomes "5100". Drops to. At this time, since the upper regions of the right object detection sensor 27B and the central object detection sensor 27C of the top plate 11 are also deflected, their respective light receiving levels are also predetermined values (not shown, for example, the light reception of the right object detection sensor 27B). The level drops to "13000" and the light receiving level of the central object detection sensor 27C drops to "7500").

Therefore, in the mounting determination unit 313, in the standard state without a pan, for example, the light receiving level of the left object detection sensor 27A is "14000" or more from the reference level, the light receiving level of the right object detection sensor 27B is "6000" or more, and the center. If the fluctuation state in which the light receiving level of the object detection sensor 27C is lowered by "12000" or more continues for a predetermined time or more (for example, 5 seconds or more), the cooking utensil 5 is placed on the trivet 15 of the left burner 21A. It is determined that the state is "present". Further, the operation state monitoring unit 314 causes the reference correction unit 315 to set the light receiving level of each object detection sensor 27A, 27B, 27C at that time as the respective reference level.

On the other hand, the light receiving level of the right object detection sensor 27B is "14000" or more from the reference level, the light receiving level of the left object detection sensor 27A is "6000" or more from the reference level, and the light receiving level of the central object detection sensor 27C is "12000" from the reference level. When the fluctuating state that has decreased by more than that continues for a predetermined time or more (for example, 5 seconds or more), the placement determination unit 313 is in the “state with a pot” in which the cooking utensil 5 is placed on the trivet 15 of the right burner 21B. Judge that there is. Further, the operation state monitoring unit 314 causes the reference correction unit 315 to set the light receiving level of each object detection sensor 27A, 27B, 27C at that time as the respective reference level.

Although not shown, when the cooking utensil 5 is placed on the trivet 15 of the rear burner 21C in the standard state without a pot, the degree of bending of the top plate 11 in the upper region of the central object detection sensor 27C becomes large. The upper regions of the left object detection sensor 27A and the right object detection sensor 27B each have substantially the same deflection. Therefore, for example, a fluctuation state in which the light receiving level of the central object detection sensor 27C is "12000" or more lower than the reference level and the light receiving levels of the left object detection sensor 27A and the right object detection sensor 27B are both lowered by "6000" or more from the reference level is a predetermined time. If the above (for example, 5 seconds or more) is continued, the placement determination unit 313 determines that the cooking utensil 5 is placed on the trivet 15 of the rear burner 21C in a “pot state”. Further, the operation state monitoring unit 314 causes the reference correction unit 315 to set the light receiving level of each object detection sensor 27A, 27B, 27C at that time as the respective reference level.

When there is a pan at the heating position corresponding to any of the stove burners 21A, 21B, 21C, for example, when the light receiving level of the left object detection sensor 27A rises to "9500" after the left burner 21A is ignited. That is, when the temperature rises by "4400" or more from the reference level, the fluctuation determination unit 312 tells the burner control unit 302 that the object T has approached the limit distance (here, 10 cm) with respect to the left burner 21A. Forcibly extinguish the fire.

If the cooking utensil 5 is removed from the heating position when the pan is in the heating position corresponding to any of the stove burners 21A, 21B, 21C, the degree of bending of the top plate 11 returns to the original state. Therefore, the light receiving level of each of the object detection sensors 27A, 27B, and 27C rises to the light receiving level "19600" in the standard state without a pan. Therefore, in this case, the mounting determination unit 313 determines that the cooking utensil 5 is in the “standard state without a pan” with the cooking utensil 5 removed from the heating position. Further, the operation state monitoring unit 314 causes the reference correction unit 315 to set the light receiving level at that time as the reference level of each object detection sensor 27A, 27B, 27C.

As described above, according to the cooking cooker 1, each of them is based on the degree of change of the light receiving level of the infrared ray detection light by the plurality of object detection sensors 27A, 27B, 27C provided on the lower surface side of the top plate 11. Since the placement or removal of the cooking utensil 5 at the heating position is detected, there is a risk that the placement or removal of the cooking utensil 5 may fail to be detected due to deformation of moving parts or adhesion stains as in the conventional cooking cooker described above. There is no. Therefore, it is possible to accurately detect whether or not the cooking utensil 5 is placed at a predetermined heating position on the top plate 11, and it is possible to appropriately control the output of the heating means according to the detection result. As a result, the operational stability of the cooking cooker 1 is improved.

Further, in the cooking cooker 1, the state in which the light receiving level of the infrared detection light by the object detection sensors 27A, 27B, 27C has changed from the reference level by a predetermined level or more (fluctuation state) has continued for a predetermined time or more on the top plate 11. By determining that the cooking utensil 5 is placed on the top plate 11, it is possible to more accurately detect whether or not the cooking utensil 5 is placed at a predetermined heating position on the top plate 11. The operational stability of the cooking device 1 is further improved.

Moreover, in the heating cooker 1, in addition to placing and removing the cooking utensil 5 at each heating position on the top plate 11, approaching the user's hand and clothes to each heating position, and instructing the operation of the cooking cooker 1. Since the movement of the user's hand corresponding to the above can be detected by using the common object detection sensors 27A, 27B, 27C, it is possible to simplify the overall structure of the cooking cooker 1.

Further, according to the heating cooker 1, the reference level is corrected as the cooking utensil 5 is placed or removed, and the object detection sensors 27A, 27B, 27C are corrected based on the corrected reference level. Since the degree of change in the light receiving level of the infrared detection light is determined, even if the degree of bending of the top plate 11 changes due to the weight of the cooking utensil 5, the user's hands and clothes approach each heating position and heat. It is possible to more accurately detect the movement of the user's hand corresponding to the operation instruction of the cooker 1. As a result, when the user's hand or clothes approach the ignited stove burners 21A and 21B, the thermal power of the corresponding stove burners 21A and 21B can be limited at an appropriate timing. Further, even when the user's hand or clothes are near the non-ignited stove burners 21A and 21B, the ignition of the corresponding stove burners 21A and 21B can be appropriately restricted.

In the above embodiment, when the object T approaches a predetermined area on the top plate 11 to a predetermined distance, the corresponding stoves 21A and 21B are automatically extinguished. When T approaches the predetermined area to the limit distance, the thermal power of the corresponding stove burners 21A and 21B may be limited to a smaller thermal power (for example, the minimum thermal power) than the set thermal power.

In the above embodiment, a gas burner is used as a heating means for heating the cooking utensil 5 placed on the top plate 11, but in the present invention, radiant heat or conduction heat from an electric heating portion is described as the heating means. It can be applied to a heating cooker using an electric heater for heating the cooking utensil 5, and also to a heating cooker using an electromagnetic induction heater for heating the cooking utensil 5 by electromagnetic induction. It can also be applied to a cooking device in which a gas burner, an electric heater, and an electromagnetic induction heater are used in combination as a plurality of heating means.

Further, the present invention is applicable not only to the built-in stove used by being embedded in the counter top 4 of the kitchen, but also to the table stove used by placing it on the table of the kitchen.

1 Cooking cooker 10 Equipment body 11 Top plate 16 Display window (translucent part)
17A, 17B Light receiving / emitting window (translucent part)
21A, 21B, 21C stove burner (heating means)
27A, 27B, 27C Object detection sensor (object detection means)
271 Infrared light emitting part (light emitting means)
272 Infrared light receiving part (light receiving means)
3 Main control circuit (control means)
312 Fluctuation determination unit (operation instruction determination means)
313 Placement determination unit (mounting determination means)
315 Reference correction unit (reference correction means)
5 Cooking utensils (objects to be heated)
T object

Claims (4)

A heating cooker provided with a top plate constituting the upper surface of the main body of the appliance and a plurality of heating means for heating an object to be heated placed at a predetermined heating position on the top plate, which is provided on the top plate. A plurality of object detection means for detecting the movement of an object on the top plate and a control means for controlling the output of the heating means according to the detection result of the object detection means are provided on the lower surface side of the light-transmitting portion. ,
The object detection means includes a light emitting means that emits the detected light onto the top plate through the translucent portion and a light receiving means that receives the detected light that is reflected by the object on the top plate and returned through the transmissive portion.
The control means determines whether the object to be heated is placed at the heating position corresponding to which heating means based on the degree to which the light receiving level of the light detected by each object detection means changes from the reference level. A cooker with means. In the cooking apparatus according to claim 1,
The mounting determination means is a cooking device that determines that an object to be heated is placed at the heating position when a fluctuating state in which the light receiving level changes from a reference level by a predetermined level or more continues for a predetermined time or longer. In the cooking apparatus according to claim 1 or 2.
The control means is a cooking cooker provided with an operation instruction discriminating means for discriminating information on a change in the light receiving level of the detected light by each object detecting means as an operation instruction of the appliance. In the cooking apparatus according to any one of claims 1 to 3,
The control means is a cooking cooker provided with a reference correction means for correcting the reference level when the placement or removal of the object to be heated at the heating position is detected.

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