JP4893014B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker having an automatic cooking function such as rice cooking and rice crackers and using a capacitive touch key.

  In recent years, induction heating cookers have been recognized for their excellent features such as safety, cleanliness, and high efficiency, and have been widely used in kitchens for general homes and business use.

  In addition, as a capacitive touch key mounted on a device, a capacitor is formed by providing an electrode on a flat panel, and a change in the capacitance of the capacitor caused by a person touching the panel with a finger is applied to a DC voltage. There is one that converts and detects the change (see, for example, Patent Document 1).

  In the above-mentioned patent document, a plurality of drive electrodes and a plurality of detection electrodes having predetermined intervals are alternately arranged on the back surface of a flat plate (top plate) made of a dielectric, and the drive electrodes are mutually connected. It is described that the detection electrodes are electrically connected and the detection electrodes are electrically connected to each other, and this configuration forms a touch area for detecting an input.

In addition, an induction heating cooker equipped with a temperature sensor, an automatic temperature control function for frying tempura, an automatic water boiling function for detecting boiling and automatically stopping heating, and a process control function for cooking rice and porridge increase. Yes.
JP-A 61-292932 Japanese Patent Laid-Open No. 2003-31987

  However, in the conventional configuration described above, the user overflows with water on the top plate, or the food spilled from the pan placed on the top plate is applied to the touch key part, and the person operates the key with a finger. A key is received by mistake, and during cooking, for example, during automatic cooking such as during boiling or cooking, there is a problem that cooking is stopped halfway.

  In addition, in an induction heating cooker equipped with multiple burners, when one of the burners performs automatic cooking and the other burner performs other cooking, the cut key of the burner performing automatic cooking is accidentally pressed. , Cooking may stop halfway.

  In addition, in automatic cooking using ingredients such as rice cooking and rice crackers, it becomes impossible to eat, the material is wasted, and in tempura temperature control, it takes time until the oil temperature reaches the proper temperature and cooking is possible For this reason, it has the subject that cooking takes time.

  The present invention solves the above-mentioned problem, and even when automatic cutting is stopped during automatic cooking, or when the automatic cooking is stopped due to water splashing on the top of the touch key, heating is not immediately stopped. In addition, even if heating is stopped, even if heating is stopped, there is a return key that allows automatic cooking to be started again, and even if a touch key is received, cooking does not end halfway. In automatic cooking such as Japanese porridge, less material is wasted, and in tempura temperature control, it is possible to reach an appropriate oil temperature quickly, thereby making the induction heating cooker more convenient to use. The purpose is to provide.

In order to solve the above-described conventional problems, an induction heating cooker according to the present invention includes a heating unit that induction-heats a pan, a top plate that is provided above the heating unit, and a pair of electrodes that are provided on the top plate. A plurality of touch keys including a selection key for selecting automatic cooking, a turn / on key for turning on / off the heating means, and a return key, and a change in voltage of each of the touch keys. Automatic cooking by controlling the energization of the heating means based on the output of the press detection means by the selection key , the input detection means for converting to the input means, the press detection means for detecting the press of the touch key based on the output of the input means and process control means for performing, and a timer means for starting a time measurement based on the output of the press detection unit according to the off / on key, the process control unit before a way is performing automatic cooking When there is an output of said depression detecting means by off / on key, it is assumed that the output of the timer clocking means stops the heating means to be a first predetermined value, and, after stopping the heating means in when said output of the timer means the return key on until the second predetermined value is depressed again automatic cooking said process control means has been performed halfway, and configured to start continuously Is.

  As a result, even if the cut key is accidentally pressed during automatic cooking, the top plate on which the pan is placed overflows with water, and even if it hits the upper part of the touch key, automatic cooking continues with the return key and starts again. Therefore, in cooking rice and soy sauce, the material is not wasted, and in tempura temperature control, cooking can be resumed quickly.

  The induction heating cooker of the present invention, even when the cut key is accidentally pressed during automatic cooking, or when the top plate on which the pan is placed overflows with water, is applied to the top of the touch key, and the key is erroneously detected, With the return key, automatic cooking can be continued and started again.

According to a first aspect of the present invention, there is provided a selection key and a heating means for selecting automatic cooking , comprising a heating means for inductively heating a pan, a top plate provided on the top of the heating means, and electrodes provided on the top plate as a pair of front and back A plurality of touch keys including a turn / on key to turn off / on and a return key; input means for converting a change in capacitance of each of the touch keys into a voltage change; and a touch key based on an output of the input means. A press detection means for detecting a press, and a process control means for controlling the energization power of the heating means based on the output of the press detection means by the selection key , and performing automatic cooking of tempura temperature control, automatic boiling, rice cooking, rice porridge, etc. the and a timer means for starting a time measurement based on the output of the press detection unit by off / on key, pressing detection by the off / on key a way process control means is performing the automatic cooking If there output stage, it is assumed that the output of the timer clocking means stops the heating means to be a first predetermined value, and the output of said timer means after stopping the heating means the when the return key is pressed until the second predetermined value the automatic cooking again to process control means has been performed halfway, it is obtained by a configuration to start continuously. By this, during automatic cooking, if you accidentally press the cut key, spill water on the top plate where the pan is placed, and if the key is received because it is on the top of the touch key, you can simply stop heating. When the return key is pressed, the automatic cooking can be resumed again, which improves usability.

In addition, during automatic cooking, if you accidentally press the cut key, spill water on the top plate where the pan is placed, and if the key is received because it is on the top of the touch key, Since cooking is continued, if the user immediately notices an error, the reception of the wrong cut key can be canceled, and the usability can be improved.

In a second aspect of the invention, in particular, in the first aspect of the invention, the process control means is provided with a display means for indicating a display relating to automatic cooking, and the display is performed after the output of the pressing means by the cut / enter key. Since the display is changed from the previous display to the blinking display, it is easy for the user to notice the error immediately and the usability is improved.

In a third aspect of the invention, in particular, in the first or second aspect of the invention, the process control means is provided with a notifying means for notifying the user of the automatic cooking process or temperature state at the time when the return key is received. Is. As a result, the user can judge the state of automatic cooking, can make a judgment such as starting automatic cooking from the beginning rather than continue again, and can know early that cooking has failed. Yes, it improves usability.

A fourth invention is, in particular, in any one invention of the first to 3, Step control hand stage, the press detection by the off / on key a way the process control means is performing the automatic cooking If the output of the timer means reaches the first predetermined value, the heating means is stopped, and then the return key until the output of the timer means reaches the second predetermined value. If the key is not pressed, the return key is not accepted. As a result, when automatic cooking is stopped for a long time in the middle of the process, automatic cooking cannot be continued and started again, and cooking failure can be prevented.

A fifth invention is, in particular, in any one invention of the first to 4, the process control means has no sensing means pot, the process control means, heating means based on the output of the press detection unit When the operation is stopped, the presence or absence of the pan is determined at a predetermined time. When the absence of the pan is detected, reception of the return key is prohibited. As a result, when the pan is taken in a state where the automatic cooking is stopped in the middle of the process, the automatic cooking cannot be continued and started again, so that the cooking failure can be prevented.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking an induction heating cooker as an example. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram showing the configuration of the induction heating cooker according to the first embodiment of the present invention.

  In FIG. 1, a pan 2 that is an object to be heated is placed on the top of the top plate 1. A heating means 3 for induction heating the pan 2 is provided at the lower part of the top plate 1. The heating means 3 is composed of a rectifier, a heating coil, a switching element, and an inverter circuit, and is connected to a commercial power source (not shown). The top plate 1 is provided with an automatic menu selection key 4a, an off / on key 4b, and a return key 4c. The touch key includes a pair of electrode portions 4 and 5, and the automatic menu selection key 4a. 5a, the on / off key 4b is 5b, the return key 4c is a pair with 5c, and is composed of an input means 6 and a press detection means 7. In addition, a process control for controlling the energizing power of the heating means 3 in accordance with a cooking process including a plurality of processes such as temperature input means 8 such as a thermistor for inputting the temperature of the top plate 1, rice cooking, porridge, automatic water heating, fried food, etc. Means 9, timer means 10, and display means 11 are provided.

  Moreover, FIG. 2 is an external view of the upper part of the top plate of the induction heating cooker in the first embodiment of the present invention. As shown in FIG. 2, the top plate 1 is arrange | positioned on the apparatus upper surface so that the pan 2 can be mounted. The touch key is composed of six touch keys including an automatic menu selection key 4a, an off / on key 4b, a return key 4c, a right down key 4d, a right off / on key 4e, and a right up key 4f. The electrode parts 4 and 5 are provided on the same plane as the top plate 1 and are disposed in front of the part on which the pan 2 is placed so that those using equipment can be easily operated. The display unit 11 displays the automatic cooking menu selected by the left burner.

  FIG. 3 is a block diagram of the input means. In FIG. 3, a high frequency voltage is formed based on the 400 kHz high frequency signal output from the oscillator 12 and applied to the electrode unit 5. When a person using the device does not touch the touch key electrode unit 4 with a finger, the high frequency voltage applied to the electrode unit 5 is pressed down as a DC voltage from the level shift unit 14 via the smoothing circuit unit. Input to the detection means 7. However, when a person using the device touches the electrode part 4a with a finger, a part of the high-frequency voltage applied to the electrode part 5b is the electrode part 5, the top plate 1, the electrode part 4, the finger (user). The voltage amplitude transmitted to the ground through the rectifying and smoothing circuit unit 13 is attenuated, and the DC voltage input to the press detection means 7 is reduced. An input means is provided for each of the electrode portions 4 and 5 corresponding to the six touch keys.

  Here, each configuration shown in FIG. 1 will be described. In the heating means 3, the switching element is turned on / off at 23 kHz, a high-frequency current is supplied to the heating coil, and the heating coil and the pan are magnetically coupled, thereby inductively heating the pan 2. Moreover, the display means 11 is comprised with a light emitting diode (LED), a liquid crystal display element (LCD), etc., and displays the electricity supply state of the heating means 3, and the selected automatic cooking menu.

  The electrode parts 4 and 5 form a pair of capacitors, and the input means 6 applies a high frequency voltage of 400 kHz to the electrode part 5 as shown in FIG. 3 and passes through the capacitor formed by the electrodes 4 and 5. The obtained signal is rectified and smoothed, converted into a DC voltage, and output. When a finger touches the electrode part 4, the capacitance of the capacitor formed by the electrode parts 4 and 5 changes, and the input means 6 converts this into a voltage change and outputs it.

  In addition, the press detection unit 7 sequentially inputs and inputs six touch keys. For each touch key, it is detected that the input voltage value is lower than the determination reference value by 0.4 V or more, it is determined that the key is pressed, and a signal indicating the key press is output to the process control means 9. .

  Further, the pressing detection means 7 obtains an average value of the values read a plurality of times within a range where the input voltage value is not determined to be pressed in each of the six touch keys, and stores it as a determination reference value. Note that the value that the input voltage for determining that the key is pressed is 0.4 V or more lower than the determination reference value is determined by the circuit constant, and changes if the circuit constant changes, and is not limited to this value.

  Further, the process control means 9 controls the energization of the heating means 3 in accordance with the output of the temperature input means 8 such as a thermistor for detecting the temperature of the top plate 1 just below the pan 2 to adjust the temperature of the tempura or automatically. Water heating and automatic cooking such as cooking rice and rice crackers.

  Further, the process control means 9 notifies the user by displaying the selected automatic menu on the display means 11 based on the input signal from the press detection means 7.

  Also, the timer means 10 starts a counting operation in response to the output of the press detection means 7, and measures the time from when the cut / on key 4b is pressed if automatic cooking is in progress. In this form, when 30 seconds have elapsed, the process control means 9 is instructed to stop heating. If the return key is pressed for 30 seconds, the OFF / ON key becomes invalid and automatic cooking continues.

  Furthermore, the timer means 10 commands the process control means 9 to stop the automatic cooking operation after 10 minutes. If the return key is pressed for 10 minutes, the OFF / ON key becomes invalid, heating is started again, and automatic cooking is continued.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement is demonstrated using FIG.

  FIG. 4 is a process operation diagram for automatically cooking rice. Each time the automatic menu selection key 4a is pressed, the menu displayed on the display means 11 is switched in the order of “tempura”, “boiled water”, “rice cooked”, and “rice porridge”. When the cooked rice is displayed and the cut / enter key 4b is pressed, the process control means 8 starts the rice cooking process operation, and transitions from the water immersion process to the boiling process, the cooking process, and the uneven process. I will let you. In each step, a predetermined time, temperature control temperature, and power are stored, and the energization power of the heating means 3 is controlled based on the temperature information from the temperature input means 9.

In the boiling process, the cut / enter key 4b is pressed, and the process control means 8 performs automatic cooking continuously for 30 seconds. During this time, the display means 11 blinks and displays “rice cooking”. Subsequently, after 30 seconds have elapsed, the display unit 11 turns off the display of “rice cooking” and stops the energization of the heating unit 3, but continues the automatic cooking with the energization stopped. Further, when the user is near by 30 seconds later and notices the stop state and presses the return key 4c, the heating means 3 is energized and the automatic cooking is continued.

  With the above configuration, even if a touch key is erroneously operated during automatic cooking or an intermediate stop due to erroneous detection occurs, it can be restored and continued, so that the usability can be improved.

  In addition, when automatic cooking is stopped halfway due to an erroneous operation or touch key erroneous detection during automatic cooking, in this embodiment, after 10 minutes have elapsed, acceptance of the return key 4c is prohibited and cannot be continued. Even if it continues, it will not cook well, for example, if the soaking process of “cooking rice” is extended, the rice will become rice that contains too much water. , Improving usability. Further, when automatic cooking is stopped halfway, even when no pan is detected, reception of the return key 4c is prohibited so that automatic cooking is not continued by mistake.

  In addition, when 10 minutes have elapsed, acceptance of the return key 4c is prohibited, but the set time may be changed according to the influence of the cooking menu and the interruption time in the process contents.

  When the return key 4c is received, the process control means 9 displays the process and temperature state at this time on the display means, or informs the user of the situation by using the voice notification means, thereby making it easier to use. Become.

  The temperature input means may use an infrared temperature sensor.

  Since the induction heating cooker of the present invention can continue cooking again even if a key for stopping the function is pressed during the automatic cooking, the induction heating cooker, the high-frequency heating cooker, and the halogen cooking having the automatic cooking function. It can also be applied to uses such as a cooker having touch keys such as a cooker.

The block diagram of the induction heating cooking appliance in Embodiment 1 of this invention Upper external view of induction heating cooker in Embodiment 1 of the present invention The block diagram of the input means of the induction heating cooking appliance in Embodiment 1 of this invention Process operation | movement diagram of the rice cooking of the induction heating cooking appliance in Embodiment 1 of this invention

Explanation of symbols

1 Top plate 2 Pan 4, 5 Electrode 4c Return key 8 Temperature input means

Claims (5)

Turns on / off a selection key and heating means for selecting automatic cooking, which includes a heating means for inductively heating the pan, a top plate provided on the heating means, and a pair of front and back electrodes provided on the top plate. A plurality of touch keys including a turn / on key and a return key, input means for converting a change in capacitance of each of the touch keys into a voltage change, and pressing of the touch key based on an output of the input means Press detection means for detecting, process control means for controlling energization of the heating means based on the output of the press detection means by the selection key , and an output of the press detection means by the cut / on key Timer means for starting timing based on
When the process control means is performing automatic cooking and there is an output of the pressing detection means by the turn-off / on key , the heating of the timer timing means when the output of the timer timing means reaches a first predetermined value. Means to stop, and
If the return key is pressed before the output of the timer means reaches the second predetermined value after the heating means is stopped, the automatic cooking that the process control means has been halfway is continued again. configuration and the induction heating cooker to start with. The process control means comprises display means for indicating an indication as to automatic cooking, after an output of said pressing means by the off / on key in claim 1 for changing the blinking display from the display until it said display The induction heating cooker described. The induction heating cooker according to claim 1 or 2 , wherein the process control means includes a notification means for notifying a user of a process or temperature state of automatic cooking at that time when a return key is received. Process control hand stage, the process control means outputs a first predetermined said timer time counting means when the output there is the pressing detecting unit according to the off / on key a middle of performing automatic cooking stop the heating means to be a value, then the output of the timer means when the return key on until the second predetermined value is not pressed, according to claim 1 to 3 for prohibiting the acceptance of the return key The induction heating cooking appliance of any one of Claims. The process control unit includes a no detection means pot, said process control means, when stopping the heating means, when determining the presence or absence of pot at a predetermined time, detects the no pot, The induction heating cooker according to any one of claims 1 to 4 , wherein reception of the return key is prohibited.