JP2019037703A - rice cooker - Google Patents

Abstract

To provide a rice cooker capable of driving sub heating means without insulating a driving signal to the sub heating means.SOLUTION: A rice cooker 1 includes: a heating coil 12 for heating while cooking rice; a sub heater 69 for preventing dew condensation while retaining heat or cooking rice; a heater driving circuit 67 as a driving circuit operated with DC power source; and a heater driving element 66 as a driving element turning on/off electric conduction of the sub heater 65 by a driving signal from the heater driving circuit 67. The sub heater 65 is driven by the DC power source rectified and smoothed from an AC commercial power supply, and a power source of the sub heater 65 and a GND level of the heater driving circuit 67 are composed by common potential.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rice cooker having an improved drive power supply and drive circuit for a sub-heating means.

  Conventionally, the sub-heating means of the rice cooker uses an AC commercial power source (AC power) as it is as the power source of the sub-heating means. For example, in Patent Document 1, a main heating unit that operates during cooking rice and heats the pan is provided separately from the main heating unit, and operates during cooking and warming to prevent dew condensation on the inner surface of the pan and lid. A sub-heating means for heating, a driving element for turning on / off the energization of the sub-heating means, and a microcomputer for controlling the operation of the driving element. A cooked rice cooker is disclosed.

  A circuit example of such a rice cooker is shown in FIG. In the figure, 201 is a power plug to which external AC commercial power is supplied, and 202 is a rectifier circuit that rectifies and smoothes AC commercial power from the power plug 201. A pair of power lines from the power plug 201 are respectively connected to a pair of input terminals of the rectifier circuit 202, and a pair of input terminals of the DC power circuit 203 are connected to a pair of output terminals of the rectifier circuit 202. . The pair of output side terminals of the DC power supply circuit 203 are connected to the pair of input side terminals of the control circuit 204, whereby the DC power supply (DC power) from the rectifier circuit 202 is stabilized by the DC power supply circuit 203. DC power is supplied to the control circuit 204.

  205 is a sub-heater corresponding to the above-mentioned sub-heating means, and 206 is a heater driving element corresponding to the above-mentioned driving element. A series circuit of the sub heater 205 and the heater driving element 206 is connected between a pair of power supply lines between the power plug 201 and the rectifier circuit 202. Reference numeral 207 denotes a heater drive circuit that receives a control signal from the control circuit 204, sends a drive signal to the heater drive element 206, and drives the heater drive element 206.

JP 2004-274645 A

  In the above circuit example, AC commercial power from the power plug 201 is used as it is for the power source of the sub-heater 205, whereas a DC power source circuit 203 serving as a power source for operating the heater driving circuit 207 and the control circuit 204 is used. Uses a DC power source rectified and smoothed by the rectifier circuit 202. On the output side of the rectifier circuit 202, the negative terminals of the rectifier circuit 202, the DC power source circuit 203, and the control circuit 204 are all ground terminals 208. The GND level is grounded to the same potential.

  Therefore, the AC power source as the power source of the sub heater 205 and the DC power source as the power source of the control circuit 204 and the heater driving circuit 207 have different GND levels, and the driving of the heater driving element 206 connected to the sub heater 205 is controlled. Since the heater driving element 206 is a photocoupler, phototriac, relay, or the like, it is necessary to insulate the driving signal from the heater driving circuit 207, and there is a problem that the circuit configuration becomes expensive. Moreover, in the conventional rice cooker, the structure which connects one side of AC power supply and DC power supply for control is also proposed, However, It is necessary to drive the subheater 205 according to the electric potential of AC power supply and DC power supply. However, there was a problem that the circuit configuration was complicated.

  Therefore, in view of the above circumstances, an object of the present invention is to provide a rice cooker that can drive a sub-heating unit without insulating a drive signal to the sub-heating unit.

  The rice cooker of the present invention includes a main heating means for heating a pan during rice cooking, a sub-heating means for heating to prevent dew at the time of heat insulation and rice cooking, a drive circuit operating with a DC power source, and the drive In a rice cooker provided with a drive element for turning on / off the energization of the sub-heating means by a drive signal from the circuit, the sub-heating means is driven by a DC power source rectified and smoothed from an AC commercial power source. It is characterized by.

  Moreover, the rice cooker of the present invention includes a main heating means for heating the pan during rice cooking, a sub-heating means for heating to prevent dew condensation at the time of heat insulation and rice cooking, a drive circuit operating with a DC power source, In a rice cooker provided with a drive element for turning on / off the energization of the sub-heating means by a drive signal from a drive circuit, the sub-heating means is driven by a rectified power source rectified from an AC commercial power source. It is characterized by.

  According to the first aspect of the present invention, by using a DC power supply as the power supply for the sub-heating means, the drive circuit operating with the DC power supply and the GND level can be configured to have a common potential, so that the drive circuit and the drive element are insulated. There is no need. Therefore, the sub-heating unit can be driven with an inexpensive circuit configuration without using an expensive phototriac or relay.

  According to the second aspect of the present invention, since the rectifying power source is used as the power source of the sub-heating unit, the driving circuit operating with the DC power source and the GND level can be configured to have a common potential, so that the driving circuit and the driving element are insulated. There is no need. Therefore, the sub-heating unit can be driven with an inexpensive circuit configuration without using an expensive phototriac or relay. In addition, the rectifier circuit can be configured with only a diode, and thus the cost can be reduced and the configuration can be simplified.

  According to the invention of claim 3, by using an inexpensive bipolar transistor as a drive element instead of an expensive phototriac or relay, the cost can be effectively reduced and the sub-heating means can be driven.

  According to the invention of claim 4, instead of expensive phototriacs and relays, an inexpensive field effect transistor is used as a drive element, so that the cost can be effectively reduced and the sub-heating means can be driven. .

It is a longitudinal cross-sectional view of the rice cooker which shows the 1st Embodiment of this invention. It is a block diagram which shows the main electrical structures same as the above. It is a circuit diagram which shows the circuit structure of a subheater same as the above. It is a block diagram which shows the main electrical structures of the conventional rice cooker. It is a block diagram which shows the main electrical structures of the rice cooker which shows the 2nd Embodiment of this invention. It is a block diagram which shows the main electrical structures of the rice cooker which shows the modification of 2nd Embodiment. It is a block diagram which shows the main electrical structures of the rice cooker which shows another modification of 2nd Embodiment. It is a block diagram which shows the main electrical structures of the rice cooker which shows another modification of 2nd Embodiment. It is the schematic of the rice cooker which shows the 3rd Embodiment of this invention. It is a schematic diagram of a rice scoop storage part same as the above. It is a circuit diagram of an ultraviolet LED and a scooping presence / absence detection sensor. It is a flowchart which shows the ultraviolet irradiation procedure of a rice scoop storage part same as the above. It is the schematic of the rice cooker which shows the modification of 3rd Embodiment. It is a figure which shows an example of the display of LCD of the rice cooker which shows the 4th Embodiment of this invention. It is a correspondence table which shows the inspection completion / incomplete state with respect to the display of a clock 10 minute digit display part. It is a circuit diagram which shows the circuit structure of the subheater periphery in the conventional rice cooker.

  Hereinafter, each embodiment of the rice cooker in the present invention will be described with reference to the accompanying drawings. Throughout these drawings, common parts are denoted by common reference numerals.

  1-3 has shown 1st Embodiment of the rice cooker of this invention. First, the overall configuration of the rice cooker will be described with reference to FIG. 1. 1 is a rice cooker, and is composed entirely of a main body 2 having an upper surface opened and a lid 3 that covers the upper surface opening of the main body 2 so as to be freely opened and closed. Is configured. The main body 2 has a pot accommodating portion 4 having an open upper surface. When the lid 3 is opened, a bottomed pan 5 for accommodating water or rice as a cooking object is attached to or detached from the pot accommodating portion 4. It is configured to be freely accommodated. The pot accommodating portion 4 is configured by combining a bowl-shaped resin inner frame 6, a metal inner frame ring 7, and the like, and the whole is formed in a bottomed cylindrical shape.

  The pan 5 is made of aluminum having good thermal conductivity as a main material 8, and a heating element 9 made of a magnetic metal plate such as ferritic stainless steel is joined from the lower side to the bottom of the outer surface of the main material 8. An outer surface of the inner frame ring 7 facing the outer surface of the pan 5 is provided with a body heater 11 using a cord heater as an example of a heating means. A heating coil 12 is provided on the outer surface of the inner frame 6 facing the bottom surface from the lower side of the side surface of the pan 5 as heating means for electromagnetically heating the heating element 9 of the pan 5.

  A pan sensor 14 serving as a pan temperature detecting means is disposed at the center of the bottom of the inner frame 6 so as to elastically contact the bottom of the outer surface of the pan 5. The pan sensor 14 of this embodiment is configured to detect the temperature of the pan 5 and mainly manage the heating temperature of the bottom of the pan 5 by the heating coil 12.

  On the front upper surface of the lid body 3, a lid opening button 15 is disposed in an exposed state. When the lid opening button 15 is pressed, the engagement between the main body 2 and the lid body 3 is released, and the upper portion of the main body 2 is A lid 3 is automatically opened around a hinge shaft 16 by a hinge spring (not shown) provided at the rear. In addition, a steam port unit 17 that discharges steam generated from an object to be cooked in the pan 5 to the outside of the rice cooker 1 is detachably mounted on the rear upper surface of the lid 3.

  The lid 3 is a skeleton of the lid 3 by combining an outer lid 19 as an external component forming an outer shell on the upper surface, a heat radiating plate 20 forming a lower surface of the lid 3, and the outer lid 19 and the heat radiating plate 20. The main component is an outer lid cover 21 serving as a lid base material for forming the. Inside the lid 3, a lid heater 22 as a lid heating means is provided on the upper surface of the heat radiating plate 20.

  An inner lid assembly 23 as a lower member of the lid 3 is detachably provided below the heat radiating plate 20. The inner lid assembly 23 includes a metal inner lid 24 having a disk shape having substantially the same diameter as the upper opening of the pan 5 and a lid made of an elastic member for sealing between the pan 5 and the inner lid 24. A packing 25, an inner lid ring 26 for mounting the lid packing 25 on the entire outer periphery of the inner lid 24, and a pressure adjusting unit 27 for adjusting the internal pressure of the pan 5 are provided. The ring-shaped lid packing 25 abuts on the upper surface of the pan 5 when the lid 3 is closed, closes the gap between the pan 5 and the inner lid 24, and seals the steam generated from the pan 5 To do.

  A display operation unit 28 is provided on a substantially upper center surface of the lid 3. In addition to time and time, the display operation unit 28 displays an LCD 29 that displays a selected rice cooking course and cooking, an LED 30 that displays the current process (see FIG. 2), starts rice cooking, and selects a rice cooking course. A switch 31 (see FIG. 2) is arranged on the upper part of the substrate 32 mounted inside the lid 3. Here, a microcomputer (microcomputer) 48 (see FIG. 2) or the like for controlling the operation and display and controlling each part of the rice cooker 1 is mounted on the patterned substrate 32, which will be described later. A display operation unit 28 linked to the circuit 40 is configured.

  An operation panel 33 is provided so as to cover the upper portion of the display operation unit 28. The operation panel 33 displays button names and the like, and prevents dust and water from adhering to the LCD 29, the LED 30, the switch 31, and the substrate 32, which are electronic components. Further, when a touch sensor (not shown) is provided on the LCD 29 in addition to the switch 31 provided on the substrate 32, a direct touch operation can be performed in accordance with the display on the LCD 29.

  The heat radiating plate 20 is provided with a thermistor type lid sensor 34 for performing temperature management of the inner lid 24 by the lid heater 22 as lid temperature detecting means for detecting the temperature of the lid 3, particularly the inner lid 24. Yes. In addition, a steam discharge path 35 that connects the steam port unit 17 and the pressure adjusting unit 27 is formed inside the lid body 2 as a passage for releasing steam generated in the pan 5 to the outside. The pressure regulating unit 27 is provided with a pressure regulating valve 36 that opens and closes a steam discharge path 35 between the inside of the pot 5 and the steam port unit 17. The pressure regulating valve 36 is ball-shaped and interlocks with a solenoid 37 provided inside the lid body 3. When the steam in the pan 5 is discharged to the outside, the steam discharge path 35 is opened, and the inside of the pan 5 is pressurized or In the reduced pressure state, the solenoid 37 rolls the pressure regulating valve 36 so as to close the vapor discharge path 35. At the time of pressurization, the cooked rice in the pan 5 is heated by high-frequency energization to the heating coil 12, and when the internal pressure of the pan 5 reaches a predetermined value, the steam discharge path 35 is opened against the dead weight of the pressure regulating valve 36. By doing so, it is the structure which maintains the pressure in the pan 5 more than atmospheric pressure.

  Reference numeral 38 denotes a decompression means 38 for lowering the inside of the pan 5 below the normal atmospheric pressure with the lid 3 closed to the main body 2. The decompression means 38 accommodates the pan 5 in the pan container 4, closes the lid 3, energizes the solenoid 37, and the internal pressure of the sealed pan 5 with the pressure regulating valve 36 blocking the steam discharge path 35. Reduce. Further, when the pressure inside the pan 5 drops below the atmospheric pressure by a certain value, the operation of the decompression pump 39 serving as the operation source of the decompression means 38 is stopped and the inside of the pan 5 is kept in a decompressed state. Further, when the inside of the pan 5 is returned from the decompressed state to the same pressure as the outside air, the operation of the decompressing pump 39 is stopped, and a path (not shown) communicating between the decompressing pump 39 and the inside of the pan 5 is opened. That is, the decompression means 38 also serves as a pressure return means for returning the inside of the pan 5 from the decompressed state to the same pressure as the outside air.

  In addition, a unitized heating substrate assembly 41 including a heating circuit 40 is disposed inside the main body 2. In order to electrically control each part of the rice cooker 1, the heating circuit 40 cooperates with the display operation part 28, each temperature detection signal from the pan sensor 14 and the lid sensor 34, and the operation signal from the switch 31. In response, the body heater 11 and the heating coil 12 for heating the pan 5 during cooking and heat retention, and the lid heater 22 for heating the lid 3 are controlled, and the operations of the solenoid 37 and the decompression pump 39 are controlled. . In particular, in the present embodiment, the heating coil 12 is mainly controlled based on the temperature detected by the pan sensor 14 to manage the temperature of the bottom of the pan 5, and the lid heater 22 is mainly controlled based on the temperature detected by the lid sensor 34. The temperature of the inner lid 24 facing the cooked rice is controlled.

  The heating circuit 40 includes a switching element 42 as a heating element that drives the heating coil 12, and the switching element 42 is configured to generate heat with the oscillation of the heating coil 12. Therefore, the switching element 42 is attached to a radiator 43 made of a material having good thermal conductivity such as aluminum, and an electric cooling fan 44 as a cooling means is disposed below or on the side of the radiator 43. . In this embodiment, when the cooling fan 44 is driven, cold air is taken into the cooling fan 44 inside the main body 2 from an air inlet (not shown) provided on the side surface of the main body 2, and this cold air is supplied from the radiator 43. The heat is taken away and discharged from the exhaust port (not shown) to the outside of the main body 2.

  Next, the control system of the heating circuit 40 and the display operation unit 28 will be described with reference to FIG. In the figure, in addition to the microcomputer 48, the LCD 29, the LED 30, and the switch 31, the display operation unit 28 supplies a power supply voltage to the power failure detection circuit 49 that outputs a power failure signal when a power failure is detected, and the microcomputer 48 when a power failure is detected. A backup circuit 50 to be supplied is provided. The microcomputer 48 includes a CPU (Central Processing Unit) 51, a RAM (Random Access Memory) 52, and a non-volatile flash memory 53. As a program on a control sequence stored in the flash memory 53. , A rice cooking / warming program 54, a display program 55, a switch operation program 56, a communication program 57, and a flash memory control program 58 are provided.

  The rice cooking / warming program 54 receives a rice cooking start instruction from the switch 31 via the microcomputer 48, and raises the temperature of the food to be cooked in a short time to promote the water absorption of the rice thrown into the pan 5. Heating to detect, boiling detection to detect the boiling of the food to be cooked, continuous boiling to keep the cooked food boiling, cooking to cook the cooked food in dry-up rice, and not to burn the rice In order to maintain the temperature of the pot 5 in order, the cooking process control function for heating the cooked rice in the pan 5 at a desired pressure and the rice in the pan 5 are kept at a predetermined temperature. And a heat retention control function for controlling as described above. In addition, the rice cooking and heat retention program 54 sets a timer function and the cooking time (cooking end time) and starts the timer operation so that the rice is cooked at the set cooking time so that the predetermined time of the cooking time is reached. If it comes before, the above-mentioned rice-cooking control function automatically starts rice cooking, and at the time of cooking, it has a reserved rice-cooking function that controls to keep warm by the above-mentioned heat-keeping control function.

  The switch operation program 56 controls the operation input from the switch 31 serving as an operation unit and, if provided, the touch sensor. The display program 55 includes an operation signal from the switch 31 and a heating circuit 40. The display operation of the LCD 29 and the LED 30 serving as a display unit is controlled.

  The communication program 57 is a program for communicating with an external device such as a personal computer P that is separate from the rice cooker 1, and the flash memory control program 58 rewrites the flash memory 53 by the program itself, and some settings are made. It is a program for recording data and operation history.

  The heating circuit 40 is based on a control signal from the microcomputer 48, a load driving circuit 91 that drives the body heater 11, the lid heater 22, the cooling fan 44, and the like, and an oscillation circuit and trigger detection corresponding to the driving circuit for the heating coil 12. When a circuit 92, an input voltage / input current / regenerative current detection circuit 93 corresponding to a control signal detection circuit for driving the heating coil 12, and a surge (abnormal high voltage) are applied, an abnormal signal is sent to the microcomputer 48. And a circuit for detecting the temperature of the pan 5 and the inner lid 24 when cooking or keeping warm, upon receiving a sensor signal from the pan sensor 14 or the lid sensor 34. Based on the temperature detection circuit 95 corresponding to the control signal and the control signal from the microcomputer 48, the solenoid 37, the decompression means 38, etc. are driven to A pressure regulating circuit 96 for adjusting, and a.

  Next, the circuit configuration of the sub-heater of this embodiment will be described with reference to FIG. A power plug 61 is connected to, for example, a household power outlet (not shown) and supplied with AC commercial power. For example, AC 100V power is supplied. Reference numeral 62 denotes a rectifier circuit that rectifies and smoothes the AC commercial power from the power plug 61. Here, the pair of power lines from the power plug 61 are connected to the pair of input terminals of the rectifier circuit 62, respectively. The rectifier circuit 62 is normally composed of a diode and a smoothing capacitor, and converts AC power into DC power. However, it can be converted into full-wave rectification or half-wave rectification power by constituting only the diode. These DC power supply or rectified power supply is used as a power supply for a sub-heater 65 described later.

  The pair of input terminals of the DC power supply circuit 63 is connected to the pair of output terminals of the rectifier circuit 62. The pair of output terminals of the DC power supply circuit 63 are connected to the pair of input terminals of the control circuit 64, whereby the DC power supply (DC power) from the rectifier circuit 62 is stabilized by the DC power supply circuit 63. DC power is supplied to the control circuit 64.

  In the present embodiment, a series circuit of a sub-heater 65 serving as a sub-heating unit and a heater drive element 66 serving as a drive element that turns on / off the current flow of the sub-heater 65 is provided between the power plug 61 and the rectifier circuit 62. Are not connected between a pair of AC power supply lines but between a pair of DC power supply lines between the rectifier circuit 62 and the DC power supply circuit 65. The sub-heater 65 is composed of the body heater 11 and the lid heater 22 described above in order to prevent the pan 5 and the inner surface of the inner lid 24 from being exposed to heat during cooking or cooking. The sub-heater driving element 66 is configured using a bipolar transistor or FET (field effect transistor) as an inexpensive semiconductor element with a control terminal.

  Reference numeral 67 denotes a heater drive circuit that receives a control signal from the control circuit 64, sends a drive signal to the heater drive element 66, and drives the heater drive element 66. The control circuit 64 is for controlling the operation and display, and for controlling each part of the rice cooker 1 in addition to the power interruption control of the sub heater 65, and corresponds to the microcomputer 48 described above. The heater drive circuit 67 constitutes a part of the load drive circuit 91 described above.

  In this embodiment, the DC power source from the rectifier circuit 62 is used as the power source for the sub-heater 65, and the DC power source stabilized by the DC power source circuit 63 is used as the power source for the control circuit 64 and the heater driving circuit 67. On the output side of 62, the negative terminals of the rectifier circuit 62, the DC power supply circuit 63, and the control circuit 64 as well as the negative terminals of the heater driving element 66 and the heater driving circuit 67 are all grounded terminals 68 and have the same GND level. Grounded. Therefore, the drive signal from the heater drive circuit 67 can be directly supplied to the control terminal of the heater drive element 68 without being insulated in the middle, and the energization of the sub heater 65 can be turned on / off.

  Even when the rectified power source from the rectifier circuit 62 is used as the power source of the sub-heater 65, the heater drive element 66 and the heater drive circuit 67 together with the negative terminals of the rectifier circuit 62, the DC power source circuit 63, and the control circuit 64. Similarly, each of the negative terminals can be adjusted to the same GND level as the ground terminal 68, so that the insulation with respect to the control terminal of the heater drive element 66 is not required, and the drive signal from the heater drive circuit 67 is controlled by the heater drive element 66. It is possible to supply directly to the terminal.

  In the above configuration, in this embodiment, when the power plug 61 of the rice cooker 1 is connected to an outlet, the AC commercial power applied to the power plug 61 is converted into DC power by the rectifier circuit 62, and the DC power is converted to the sub-heater 65. And is stabilized by the DC power supply circuit 63 and supplied to the control circuit 64 and the heater drive circuit 67. In response to this, the CPU 51 incorporated in the microcomputer 48 serving as the control circuit 64 reads the display program 55 and the switch operation program 56 stored in the flash memory 53 in advance, and then accepts an operation input from the switch 31. Transition to (standby) state.

  Separately from this, after the pan 5 containing the food to be cooked is set in the pan containing portion 4 and the lid 3 is closed, the rice cooking key serving as the rice cooking start instruction means configured as the switch 31 is touch-operated. Here, if the rice cooker 1 has shifted to the above-described cut-off state, the CPU 51 reads the rice cooking and heat retaining program 54 stored in advance in the flash memory 53, and cooks the cooked food in the pan 5 into rice. Therefore, a control signal is sent to the oscillation circuit and trigger detection circuit 92 at a predetermined timing to control driving of the heating coil 12 serving as the main heating means. In rice cooking heating, the pot 5 is mainly electromagnetically heated by the heating coil 12, but after the water in the pot 5 has boiled, in order to prevent the pot 5 and the inner lid 24 from being exposed to the inner surface, an auxiliary load is applied. A control signal is also sent to the drive circuit 91 at a predetermined timing, and the body heater 11 and the lid heater 22 serving as the sub heater 65 are cut off, and the pot 5 and the inner lid 24 are easily cooled. When rice cooking heating is over, the cooked rice is shifted to heat retention to maintain the predetermined temperature, and in order to continue to prevent dew on the inner surface of the pan 5 and the inner lid 24, by a control signal to the load drive circuit 91, The body heater 11 and the lid heater 22 are cut off.

  When the heater driving circuit 67 sends a driving signal to the control terminal of the heater driving element 66 in response to the control signal from the control circuit 64 in the process from rice cooking to heat retention, the heater driving element 66 is turned on and the sub heater is turned on. When the energization 65 is turned on and the transmission of the drive signal is interrupted, the heater drive element 66 becomes non-conductive and the sub-heater 65 is turned off. Here, in the present embodiment, the power level of the sub heater 65 is a DC power source or a rectified power source from the rectifier circuit 62, so that the GND level of the heater drive element 66 and the heater drive circuit 67 is configured to a common potential. It is not necessary to insulate the drive signal line between the heater drive element 66 and the heater drive circuit 67, and the sub heater 65 can be provided with an inexpensive circuit configuration without using an expensive phototriac or relay as the heater drive element 66. Can be driven.

  As mentioned above, in the rice cooker 1 of this embodiment, the heating coil 12 as a main heating means for heating the pan 5 at the time of rice cooking, and the pan 5 for preventing dew from the pan 5 at the time of heat insulation or rice cooking. A sub-heater 65 as a sub-heating means, a heater drive circuit 67 as a drive circuit operating with a DC power source, and a heater as a drive element for turning on / off the energization of the sub-heater 65 by a drive signal from the heater drive circuit 67 In the device including the driving element 66, the sub heater 65 is driven by a DC power source rectified and smoothed from an AC commercial power source.

  In this case, by using a DC power source as the power source of the sub-heater 65, the heater drive circuit 67 operating with the DC power source and the GND level can be configured at a common potential. The drive signal lines need not be insulated. Therefore, the sub-heater 65 can be driven with an inexpensive circuit configuration without using an expensive phototriac or relay.

  Instead, in the rice cooker 1 described above, the sub-heater 65 may be driven by a rectified power source rectified by full-wave rectification or half-wave rectification from an AC commercial power source.

  Also in this case, by using the rectified power source as the power source of the sub-heater 65, the heater drive circuit 67 operating with the DC power source and the GND level can be configured to have a common potential. The drive signal lines between them need not be insulated. Therefore, the sub-heater 65 can be driven with an inexpensive circuit configuration without using an expensive phototriac or relay. In addition, the rectifier circuit 62 can be configured with only a diode, and thus the cost can be reduced and the configuration can be simplified.

  In these configurations, a bipolar transistor or FET is used as the heater driving element 66. Therefore, instead of expensive phototriacs and relays, by using inexpensive bipolar transistors and FETs as drive elements, it is possible to drive the sub heater 65 while effectively reducing costs.

  5-8 has shown 2nd Embodiment of the rice cooker of this invention. In addition, the same code | symbol is attached | subjected to the same part as the said embodiment, and since description of the common location overlaps, it abbreviate | omits as much as possible. In this embodiment, an electric double layer capacitor is connected to the control microcomputer in parallel with the lithium battery, and after the rice cooker is disconnected, the battery power is not used for several hours, and the electricity stored in the electric double capacitor is used. The same lithium battery capacity as the conventional one is configured to extend the backup time during power outages.

  A circuit configuration of a conventional rice cooker will be described with reference to FIG. Reference numeral 71 denotes a load such as a heater supplied with DC power from the DC power supply circuit 63, and corresponds to the heating coil 12 described above. Reference numeral 72 denotes a control microcomputer for controlling operations and display and for controlling each part of the rice cooker 1, and corresponds to the microcomputer 48 and the control circuit 67 described above. Here, the control microcomputer 72 is supplied with DC power from the DC power supply circuit 63 and supplies DC power to the LCD 29, and the control microcomputer 72 controls the load 71 and the LCD 29. Reference numeral 73 denotes a lithium battery (primary battery), which corresponds to the above-described backup circuit 50 and supplies backup power to the control microcomputer 72.

  Conventionally, a rice cooker needs to operate the control microcomputer 72 in order to display a clock or the like even while the commercial power supply is cut off (power failure), and the above backup power supply is backed up by the lithium battery 73. However, due to recent energy savings and power savings, the time for disconnecting the commercial power supply by removing the power plug 61 from the outlet is increasing except for rice cooking and heat retention. For this reason, if the capacity of the lithium battery 73 that backs up the control microcomputer 72 during disconnection is the same as the conventional capacity, the lithium battery capacity will be lost before the product life, and a large capacity is required to extend the backup time. There was a problem that it was necessary to use a battery or several batteries.

  Therefore, in the present embodiment, as shown in FIG. 5, an electric double layer capacitor 74 is connected in parallel with the lithium battery 73, and the DC power from the DC power supply circuit 63 is supplied to the electric double layer capacitor 74. The electric double layer capacitor 74 is charged through the DC power supply circuit 63 when the commercial power supply is energized.

  The operation of the rice cooker 1 having the above configuration will be described. As described above, it is necessary to operate the control microcomputer 72 even when the commercial power supply is cut off. A lithium battery is used as the power supply for the control microcomputer 72 at that time. 73, an electric double layer capacitor 74 is connected in parallel with the lithium battery 73. The power source for the control microcomputer 72 when the commercial power source is cut off is configured to use the electric double layer capacitor 74 first, and use the power source of the lithium battery 73 when the electric double layer capacitor 74 is depleted. Specifically, the electric double layer capacitor 74 is charged at a voltage higher than the voltage of the lithium battery 73 when the commercial power source is energized, and when the commercial power source is disconnected, the voltage from the electric double layer capacitor 74 is the lithium battery. When the voltage from the electric double layer capacitor 74 is higher than the voltage from the lithium battery 73, the microcomputer driving voltage is supplied from the electric double layer capacitor 74 to the control microcomputer 72. A microcomputer drive voltage is supplied from the lithium battery 73 to the control microcomputer 72. Therefore, it is possible to guarantee a long commercial power outage (disconnection) time without backing up the control microcomputer 72 with the electric double capacitor 74 for a certain period of time and without using a large capacity primary battery.

  As described above, in the rice cooker 1 of the present embodiment, the electric double layer capacitor 74 is connected in parallel with the backup microcomputer 72 backup lithium battery 73 as a microcomputer when the commercial power supply is cut off. Is charged through the DC power supply circuit 63 when the commercial power supply is energized, and when the commercial power supply is cut off, the electricity stored in the electric double layer capacitor 74 is used, and when the electricity is lost, the electricity of the lithium battery 73 is used. It is configured. Therefore, it is possible to guarantee a long commercial power outage (disconnection) time without backing up the control microcomputer 72 with the electric double capacitor 74 for a certain period of time and without using a large capacity primary battery.

  FIG. 6 shows a modification of the second embodiment, and the rice cooker 1 here is configured by providing a constant voltage circuit 75 at the output of the electric double layer capacitor 74. Since other configurations are the same as those of the second embodiment, the description thereof is omitted. In this modification, DC power from the DC power supply circuit 63 is supplied to the electric double layer capacitor 74, and a microcomputer drive voltage is supplied to the control microcomputer 72 via the constant voltage circuit 75. Here, the output voltage from the constant voltage circuit 75 is slightly higher than the voltage from the lithium battery 73, and the output voltage from the constant voltage circuit 75 is the voltage from the lithium battery 73 when the commercial power supply is cut off. When the voltage is higher, the microcomputer driving voltage is supplied from the electric double layer capacitor 74 to the control microcomputer 72 via the constant voltage circuit 75, while the output voltage from the constant voltage circuit 75 is lower than the voltage from the lithium battery 73. The microcomputer drive voltage is supplied from the lithium battery 73 to the control microcomputer 72. With this configuration, the voltage supplied to the control microcomputer 72 can be a constant voltage regardless of the charge voltage of the electric double layer capacitor 74.

  As described above, in this embodiment, the constant voltage circuit 75 having a voltage slightly higher than that of the lithium battery 73 is provided at the output of the electric double layer capacitor 74 connected in parallel with the lithium battery 73. Therefore, the voltage supplied to the control microcomputer 72 can be made constant regardless of the charging voltage of the electric double layer capacitor 74.

  FIG. 7 shows a further modification of the second embodiment, and the rice cooker 1 here is configured by providing a constant voltage circuit 75 at the input of the electric double layer capacitor 74. Since other configurations are the same as those of the second embodiment, the description thereof is omitted. In this modification, DC power from the DC power supply circuit 63 is supplied to the electric double layer capacitor 74 via the constant voltage circuit 75 so that a voltage higher than the output of the constant voltage circuit 75 is not charged in the electric double layer capacitor 74. It is configured. Also in this modified example, the output voltage of the constant voltage circuit 75 is slightly higher than the voltage from the lithium battery 73 as in the above modified example, and when the commercial power supply is disconnected, the electric voltage from the electric double layer capacitor 74 is When the voltage is higher than the voltage from the lithium battery 73, the microcomputer drive voltage is supplied from the electric double layer capacitor 74 to the control microcomputer 72, while the voltage from the electric double layer capacitor 74 is lower than the voltage from the lithium battery 73. At this time, the microcomputer drive voltage is supplied from the lithium battery 73 to the control microcomputer 72. With this configuration, the voltage supplied from the electric double layer capacitor 74 to the control microcomputer 72 when the commercial power supply is cut off is always a certain voltage or less, and the supplied backup voltage is equal to or higher than the operating voltage of the control microcomputer 72. Can be prevented.

  As described above, in the embodiment of the present example, the constant voltage circuit 75 having a voltage slightly higher than that of the lithium battery 73 is provided at the input of the electric double layer capacitor 74 connected in parallel with the lithium battery 73. The electric double layer capacitor 74 is configured not to be charged beyond the voltage. Therefore, the voltage supplied from the electric double layer capacitor 74 to the control microcomputer 72 when the commercial power supply is cut off can always be kept below a certain voltage.

  FIG. 8 shows a further modification of the second embodiment. Here, the rice cooker 1 is connected to the output of the lithium battery 73 and the electric double layer capacitor 74 which are power supply lines to the control microcomputer 72. The diodes 76 and 77 are inserted, respectively. In this modification, the diode 76 is connected to the lithium battery 73 such that the anode side of the diode 76 is connected, and the cathode side of the diode 76 is connected to the connection point side of the lithium battery 73 and the electric double layer capacitor 74. Insert connected to output. Similarly, the diode 77 is connected to the electric double layer capacitor 74 such that the anode side of the diode 77 is connected, and the cathode side of the diode 77 is connected to the connection point side of the lithium battery 73 and the electric double layer capacitor 74. The output of the capacitor 74 is inserted and connected. Since other configurations are the same as those of the second embodiment, the description thereof is omitted. With such a configuration, when the voltage from the electric double layer capacitor 74 is higher than the voltage from the lithium battery 73, the lithium battery 73 is prevented from being charged by the voltage from the electric double layer capacitor 74. When the voltage from the battery 73 is higher than the voltage from the electric double layer capacitor 74, it is possible to prevent the electric double layer capacitor 74 from being charged by the voltage of the lithium battery 73.

  As described above, in the embodiment of the present example, the diodes 76 and 77 are provided at the outputs of the lithium battery 73 and the electric double layer capacitor 74 connected in parallel with the lithium battery 73, respectively. The capacitors 74 are configured so that the electricity does not flow to each other. For this reason, when the voltage of the electric double layer capacitor 74 is higher than the voltage of the lithium battery 73, the voltage of the electric double layer capacitor 74 is prevented from charging the lithium battery 73, and conversely, the voltage of the lithium battery 73 is electric. When the voltage of the double layer capacitor 74 is higher, the voltage of the lithium battery 73 can be prevented from charging the electric double layer capacitor 74.

  9-12 has shown 3rd Embodiment of the rice cooker of this invention. In addition, the same code | symbol is attached | subjected to the same part as the said embodiment, and since description of the common location overlaps, it abbreviate | omits as much as possible. In this embodiment, the main body 2 is provided with a rice scoop storage unit 82 for storing rice scoop, and the rice scoop is stored in the rice scoop storage unit 82 so as to irradiate the rice scoop with ultraviolet rays.

  2. Description of the Related Art Conventionally, rice cookers have been proposed in which an irradiation section of light having an antibacterial effect such as ultraviolet rays is installed in a rice cooker to suppress yellowing and rot of cooked rice and to prevent odor. Japanese Patent Application Laid-Open No. 2012-165916 describes a rice cooker that starts irradiation of visible light in a wavelength range of 400 to 800 nm that does not include an infrared component in the heat-retaining rice after the completion of rice-cooking heating. ing. Japanese Patent Laid-Open No. 2010-35858 describes a rice cooker that emits sterilizing light to a cooked rice during a water absorption process or a heat retaining process of the cooked rice. Japanese Patent Application Laid-Open No. 2000-139696 describes a rice cooker that emits ultraviolet light by irradiating microwaves during microwave heating during heat insulation, and irradiates the rice in the pan.

  However, the conventional rice cooker as described above has a description for the sterilization of rice in the pan, but there is no description for the sterilization of rice scoop, and the sterilization of rice scoop is not conceived. It was. The rice crackers may come in contact with the open air, and if you touch the rice with the rice paddies with various germs, the rice will also get bacteria, causing yellowing and rot.

  Therefore, in this embodiment, the rice scoop is sterilized by a configuration in which ultraviolet rays having a bactericidal effect are irradiated on both sides of the rice scoop.

  The configuration of the present embodiment will be described with reference to FIGS. 9 to 11. A rice scoop storage unit 82 is provided on the side surface of the main body 2 of the rice cooker 1, and the rice scoop storage unit 82 is configured to insert rice scoop. Has been. The configuration of the rice scoop storage unit 82 will be described in detail. A container 85 stores the rice scoop, is configured to be detachable from the rice scoop storage unit 82, and can store water in addition to storing the rice scoop. The container 85 includes a bottom part 85a, a container main body 85b, and a flange part 85c. In the present embodiment, the bottom 85a of the container 85 is formed in a cross-sectional mountain shape, and is made of a material that transmits light such as an LED. The container body 85b has a front surface and a rear surface that are opposed to both surfaces of the rice paddle when the rice paddle is inserted into the rice paddle storage portion 82, and the front and rear surfaces are made of a material that transmits ultraviolet rays, such as ultraviolet transmissive glass. The ultraviolet LED 83, which will be described later, is configured to efficiently irradiate ultraviolet rays on both sides of the paddle from the outside of the container 85 through the front or rear surface of the container 85. The hook portion 85c is a place where the container is held by a finger when the container 85 is attached to or detached from the rice paddle storage portion 82. Note that when the container 85 is stored in the rice paddle storage portion 82, the lower surface of the flange portion 85 c is placed in the opening of the rice paddle storage portion 82, and the container 85 is suspended from the rice paddle storage portion 82. Good. Further, the container 85 and the bottom 85a are configured to be held at an angle with respect to the rice scoop storage unit 82. If the rice scoop is inserted halfway through the rice scoop storage unit 82, even if the hand is removed from the rice scoop, the bottom 85a is moved by gravity. The rice scoop may be slid and inserted.

  In addition to the container 85, the rice scoop storage unit 82 includes a scooping presence / absence sensor 84 for detecting scooping and an ultraviolet LED 83 as ultraviolet irradiation means for irradiating ultraviolet rays. Control is performed by a control unit 81 to be described later. The scoring presence / absence sensor 84 of the present embodiment uses a photo interrupter, and is arranged along the bottom 85a of the container 85 so that the light emitting unit 88 that emits light and the light receiving unit 89 that emits the emitted light face each other. In the vicinity of the mountain-shaped bottom portion 82a of the rice paddle storage portion 82 formed by sandwiching the bottom portion 82a, the rice paddle blocks the light from the light emitting portion 88 when the rice paddle is inserted to the bottom portion 85a. It is configured to detect rice paddies. The bottom portion 82a may be made of a material that transmits light, such as an LED, and is configured by providing holes or the like in the vicinity of the light emitting portion 88 and the light receiving portion 89 so as not to block the light from the light emitting portion 88. May be.

  The ultraviolet LED 83 constitutes an ultraviolet irradiation unit, and is provided in each of the upper surface and the lower surface of the rice scoop storage unit 82, and is substantially perpendicular to the front surface or the rear surface of the container 85 stored in the rice scoop storage unit 82. Is arranged so as to irradiate both sides of the scuffer with ultraviolet rays through the front or rear surface of the container 85. In FIG. 10, four ultraviolet LEDs 83 are arranged inside the upper surface and the lower surface of the rice paddle storage unit 82, but ultraviolet rays are appropriately applied to both sides of the rice paddle stored in the rice paddy storage unit 82. Irradiation is sufficient, and the number, arrangement, and shape are not limited.

  A control unit 81 corresponds to the display operation unit 28 and the heating circuit 40 described above. The control unit 81 receives the squatting detection signal from the squatting presence / absence detection sensor 84 and controls the ultraviolet LED 83 that irradiates the squatting with ultraviolet rays. The control unit 81 includes ultraviolet irradiation control means having a timer function as a function on the control sequence of the program stored in the storage unit (not shown).

  FIG. 11 is a circuit diagram of the ultraviolet LED 83 and the scooping presence / absence detection sensor 84 in the scooping container 82. The configuration of the ultraviolet LED 83 will be described with reference to FIG. 11A. A series circuit of the ultraviolet LED 83, the resistor 86, and the digital transistor 87 is inserted and connected between the power supply voltage terminal VDD and the common terminal 68. The control unit 81 is connected to the base terminal, and an ON / OFF signal from the control unit 81 is input to the base terminal. Therefore, when an ON / OFF signal from the control unit 81 is input to the base terminal, a current flows between the collector and the emitter of the digital transistor 87, a current flows through the ultraviolet LED 83, and the control unit 81 to the base terminal is turned on. When the input of the ON / OFF signal from is stopped, the current between the collector and the emitter of the digital transistor 87 does not flow, the current does not flow to the ultraviolet LED 83 and the light is turned off. Therefore, the ultraviolet LED 83 is turned on / off by an ON / OFF signal from the control unit 81.

  The configuration of the scoring presence / absence detection sensor 84 will be described with reference to FIG. 11B. A light emitting unit 88 is connected between the power supply voltage terminal VDD and the common terminal 68, and a light receiving unit 89 is provided in parallel with the light emitting unit 88. It is connected. In addition, as described above, the light emitting unit 88 and the light receiving unit 89 are installed so as to face each other so that light emitted from the light emitting unit 88 enters the light receiving unit 89. A control unit 81 is connected to the light receiving unit 89, and a scoop detection signal from the light receiving unit 89 is input to the control unit 81. For this reason, when the light from the light emitting unit 88 is blocked by the scooping, the light receiving unit 89 detects it and transmits a scooping detection signal to the control unit 81 to detect the presence / absence of the scuffing by the photo interrupter.

  Next, the effect | action is demonstrated based on the flowchart of FIG. 12 about the rice cooker 1 of the said structure. In step S11, when the power plug 61 of the rice cooker 1 is inserted into an outlet, the rice cooker 1 is energized and the power is turned on, and the process proceeds to step S12.

  In step S12, the scooping presence / absence detection sensor 84 of the scooping storage unit 82 starts to detect scooping. Here, when the rice scoop is not detected, the control unit 81 determines that the rice scoop is “absent”, repeats step S12, and causes the scoring presence / absence detection sensor 84 to repeat the detection of the rice scoop until the rice scoop is detected. When the rice scoop is detected by blocking the light from the light emitting unit 88, the light receiving unit 89 transmits a rice scoop detection signal to the control unit 81, and the control unit 81 determines that the rice scoop is “present”. The process proceeds to step S13.

  When the scooping is detected and the process proceeds to step S13, the control unit 81 starts detection of water in the container 85, and the control unit 81 sets the ultraviolet irradiation time of the ultraviolet LED 83 according to the result. Specifically, when the control unit 81 determines that there is water in the container 85, the process proceeds to step S14, and the control unit 81 sets the irradiation time of the ultraviolet light of the ultraviolet LED 83 to 2 hours. If the control unit 81 determines that there is no water in the container 85, the process proceeds to step S15, and the control unit 81 sets the irradiation time of the ultraviolet LED 83 to 3 hours. As for water detection, for example, the weight of the container 85 is detected by a weight sensor or the like, and if the container 85 containing the rice paddle has a predetermined weight or more, a signal is transmitted from the weight sensor to the control unit 81. You may comprise so that it may be judged that there exists water in 85. FIG.

  After setting the ultraviolet irradiation time, the process proceeds to step S16, and the control unit 81 transmits an ON / OFF signal to the ultraviolet LED 83 by the ultraviolet irradiation control means to turn on the ultraviolet LED 83 to start the irradiation of the ultraviolet light. The timer function of the control means starts counting down the irradiation time of ultraviolet rays. Thereafter, when the process proceeds to step S17 and the ultraviolet irradiation end time has elapsed, the process proceeds to step S18, where the control unit 81 turns off the ultraviolet LED 83 with an ON / OFF signal, thereby completing the ultraviolet irradiation. Thereafter, the process proceeds to step S17, and the control unit 81 causes the squatting presence / absence detection sensor 84 to detect squatting again. Here, when the rice scoop is detected, the control unit 81 determines that the rice scoop is “present” and proceeds to step S18, determines that the irradiation of the ultraviolet light to the rice pad is completed, and turns off the ultraviolet LED 83. Leave it on. Further, when the rice scoop is not detected, the control unit 81 determines that the rice scoop is “none”, and proceeds to step S12. After the power is turned on, the control unit 81 repeats detection of the rice scoop detection until the rice scoop is detected. Repeat the scoop detection. By comprising in this way, ultraviolet irradiation is started after scooping detection, and since ultraviolet irradiation is complete | finished when fixed time passes, there exists an energy-saving effect.

  FIG. 13 shows a modification of the third embodiment. The rice cooker 1 here is provided with a rice paddle storage portion 82 outside the main body 2 and is installed on the side surface of the main body 2. Yes. The rice scoop storage unit 82 of this example can insert rice scoop from above. Other configurations and functions and effects are the same as those in the third embodiment described above, and a duplicate description is omitted. This configuration also has an energy saving effect because ultraviolet irradiation is started after scoring is detected and ultraviolet irradiation is terminated over time. Moreover, since it can provide additionally by attaching the rice scoop storage part 82 to the existing rice cooker irrespective of the kind of rice cooker, the breadth of design can be expanded.

  As mentioned above, in the rice cooker 1 of this embodiment, the main body 2 includes the rice scoop storage unit 82, and is configured to sterilize the rice scoop by irradiating ultraviolet rays in a state in which the rice scoop storage unit 82 is stored. . Therefore, the rice scoop can be stored and sterilized, and the rice paste can be sterilized easily and reliably by irradiating with ultraviolet rays.

  Moreover, the ultraviolet irradiation means of this embodiment is comprised using ultraviolet LED83, and the rice cooker 1 can be reduced in size.

  In addition, the ultraviolet LED 83 constituting the ultraviolet irradiation unit of the present embodiment is configured to be able to irradiate both sides of the rice scoop, and can increase the sanitization effect of the rice scoop.

  Moreover, the rice cooker 1 of this embodiment is provided with a rice paddle presence / absence detection sensor 84 as a sensor for determining whether rice scoop is stored, and is configured to irradiate ultraviolet rays when detecting that the rice paddle has been stored. Therefore, it is possible to save the trouble of pressing a button to irradiate ultraviolet rays and improve the usability of the rice cooker 1.

  Moreover, in the rice cooker 1 of this embodiment, it is comprised so that ultraviolet irradiation may be complete | finished automatically in a fixed time after rice scoop is accommodated. Therefore, it is possible to save the trouble of performing an operation to end the ultraviolet irradiation and improve the usability of the rice cooker 1. Moreover, since ultraviolet irradiation is complete | finished with progress of time, there exists an energy saving effect.

  Moreover, in the rice cooker 1 of this embodiment, it is comprised so that ultraviolet irradiation time may be changed with the case where there is water in the rice paddy storage part 82, and when it does not exist. Therefore, the sanitization effect of rice scoop can be stabilized.

  A fourth embodiment of the rice cooker of the present invention will be described with reference to FIGS. 2 and 14 to 15. In addition, the same code | symbol is attached | subjected to the same part as the said embodiment, and since description of the common location overlaps, it abbreviate | omits as much as possible.

  Generally, home appliances such as rice cookers are also inspected during assembly. Examples of this inspection include inspection of the rated wattage of the home electric appliance, switch operation, and inspection of loads such as lamps, motors, and heaters. If the home appliances are shipped with these inspections missing, a complaint will be made, and in some cases, the safety of the home appliances will be involved. Also, if the rated wattage of home appliances is not within the range stipulated by law, it will be against the law. However, in the conventional rice cooker, when a power failure occurs, the inspection status is not known, and there is a risk that an assembly error or forgotten inspection may occur.

  Therefore, in the present embodiment, in the assembling process of the rice cooker 1, a dedicated display in the process is displayed on the LCD 29 so that the model and the inspection status being assembled can be understood. About the control system of the rice cooker 1 of this embodiment, since it is common with 1st Embodiment mentioned above, the overlapping description is abbreviate | omitted.

  The operation check of the rice cooker 1 in the assembly of the factory will be described. First, in the substrate 32 and the heating substrate assembly 41, a load driving circuit 91, an oscillation circuit / trigger detection circuit 92, an input voltage / input current / regenerative current detection circuit 93, It is confirmed whether the surge detection circuit 94, temperature detection circuit 95, pressure adjustment circuit 96, etc. operate normally. Subsequent assembly of the main body, which cannot be confirmed only by the substrate 32 and the heating substrate assembly 41, adjustment and confirmation of the rated wattage of the rice cooker 1, confirmation of reception of the key of the switch 31, heating coil 12, trunk heater 11, lid heater Each heater operation of 22 is confirmed.

  The reason why the above-mentioned confirmation is impossible only with the substrate 32 and the heating substrate assembly 41 is that, in the case of adjusting and confirming the rated wattage of the rice cooker 1, the heating coil 12 and pan that are parts other than the substrate 32 and the heating substrate assembly 41. This is because there is a variation depending on characteristics such as 5, and in the case of confirmation of key reception, the operation panel 33 on the top surface of the switch 31 may not be able to operate due to the size of the panel or button or incorrect installation. This is because when checking the operation, the heaters may not be able to operate due to forgetting to connect the connector.

  At the end of the inspection of the substrate 32 and the heating substrate assembly 41, the microcomputer 48 writes the data sent from the personal computer P which is the inspection personal computer by the communication program 57 into the flash memory 53 by the flash memory control program 58. Causes the display program 55 to switch the screen of the LCD 29 from the normal clock display to the process display which is a special display for the process as shown in FIG. 14, and at the same time, the inspection of the substrate 32 and the heating substrate assembly 41 is completed. Make sure you know what you ’re doing.

  More specifically, when “8FHex” is set using, for example, address 16 of the flash memory 53 in the microcomputer 48 as process display mode setting data, the reservation elements of the LCD 29 and the display elements of the numeric part are as shown in FIG. Switch to a simple process display. In the actual manufacturing process, this data writing is performed at the end of the above-described substrate inspection process. Therefore, it can be seen that the inspection process of the substrate 32 and the heating substrate assembly 41 is completed by the LCD 29 of the rice cooker 1 displaying the process. While this process is displayed, the switch operation program 56 of the microcomputer 48 is configured not to accept the rice cooking key and the heat retention key of the switch 31 when the power is turned off, and the rice cooking operation and the heat retention operation of the rice cooker cannot be performed. I am doing so. When the LCD 29 is displaying an error or when the switch 31 is operated during energization, the process display on the LCD 29 is temporarily canceled by the display program 55 of the microcomputer 48 to perform normal display. Until the inspections (d) to (d) are completed, the process display is not completely canceled. In this way, by displaying the process dedicated to the process on the LCD 29 during the assembly process of the rice cooker 1, the model and inspection status of the rice cooker 1 assembled as described later can be understood. Since it is possible to prevent forgetting the inspection, quality can be improved.

  In the process display of the LCD 29, the reservation 1 / reservation 2 selection display unit 101, the clock 10 hour digit display unit 102, the clock 1 hour digit display unit 103, the clock 10 minute digit display unit 104, and the clock 1 minute digit display Unit 105. The reservation display 1 / reservation 2 selection display unit 101 performs energization / power outage display, the reservation display 1 / reservation 2 selection display unit 101 lights up during energization, and the reservation 1 / reservation 2 selection display unit 101 during power outage. Goes off. The clock 10-digit display unit 102 displays the capacity of the rice cooker 1 and displays “1” for a 1.0 L type rice cooker and “2” for a 1.8 L type rice cooker. And the clock 1 hour digit display part 103 represents the model identification display, and the predetermined number and symbol which differ for every model of a rice cooker are displayed. Thus, in the process display of LCD29, the capacity | capacitance display and model identification display which can identify the rice cooker 1 are performed, and these numbers contain a number and a symbol. For this reason, for example, it is possible to prevent erroneous incorporation of components of the rice cooker 1, such as a controller.

  The clock 1-minute digit display unit 105 displays the number of energizations, and displays the number of times of recovery from a power failure of 3 seconds or more in hexadecimal after completion of the inspection of the substrate 32 and the heating substrate assembly 41, up to 16 times (16 Count the number of times until “F” is displayed. Here, it is configured not to count immediately after returning from reset. In this way, when the rice cooker 1 is out of power, the microcomputer 48 records the number of times the power is restored from the power outage in the flash memory 53 and updates the display contents of the process display on the LCD 29, and displays the number of power outages with numbers and symbols. Whether the device 1 is new or rejected (readjusted product) can be identified, and the operator who performs inspection and confirmation can be alerted, so that the quality can be improved.

  The clock 10 minute digit display unit 104 displays an inspection progress display. (A) In addition to the watt adjustment, the sensor is inspected, the flash memory 53 data is confirmed, the automatic rated wattage adjustment is also performed, and (b) the switch 31 key. (C) Confirmation of the warming watts of the rice cooker 1 and (d) Confirmation of the rated watts of the rice cooker 1 are displayed in hexadecimal. Referring to FIG. 15, in more detail, when “8FHex” is set in the process display data of the flash memory 53 as described above, the LCD 29 is switched to the process display. At this time, since the rice cooker 1 does not perform any of the inspections (a) to (d), the display program 55 displays “0” on the clock 10-minute digit display unit 104 of the LCD 29. After that, when the rice cooker 1 completes the inspection of the confirmation of acceptance of the key of the switch 31 (b), only the inspection of (b) is completed. Switch to “2”. In the process display of FIG. 14, since the clock 10-minute digit display unit 104 displays “3”, the inspection of (a) and (b) is completed in the rice cooker 1 displayed on the LCD 29. I understand. In this way, when (a) to (d) are carried out and all inspections are completed, the display program 55 switches the display of the clock 10-minute digit display unit 104 to “F”. In this embodiment, at this time, the microcomputer 48 switches the screen of the LCD 29 from the process display to the normal display by the display program 55 so that it can be understood that all the inspections (a) to (d) are completed. ing. Thereby, it is possible to reliably prevent forgetting to inspect the operation of receiving the key of the switch 31 of the rice cooker 1 and the rated wattage output. In addition, the display form of the process display of the above-mentioned LCD29 and the inspection item of the rice cooker 1 are examples, and you may change suitably according to the specification of a rice cooker.

  As described above, the rice cooker 1 of the present embodiment includes the microcomputer 48, the nonvolatile flash memory 53 provided outside or inside the microcomputer 48, and the LCD 29 as the LCD display unit. When “8FHex”, which is data different from normal, is written, the microcomputer 48 displays a process display having contents different from normal on the LCD 29, and when a specific operation is performed, the microcomputer 48 stores this specific data in the flash memory 53. The fact that the operation has been performed is recorded and the display content of the LCD 29 is updated, and when all of the predetermined specific operations (a) to (d) are completed, the process display is restored to the normal display. It is configured as follows. For this reason, by displaying the process dedicated to the process on the LCD 29, it becomes possible to know the model and inspection status of the rice cooker 1 being assembled, and it is possible to prevent assembly errors and forgetting inspections, so that quality can be improved. become.

  Moreover, in the rice cooker 1 of this embodiment, since the above-mentioned specific operation | movement is a power failure, the identification of whether the rice cooker 1 is a new article or a reject product (readjustment goods) is displayed by displaying the frequency | count of a power failure of the rice cooker 1. It is possible to improve the quality because it is possible to alert the worker who performs inspection and confirmation.

  Moreover, in the rice cooker 1 of this embodiment, since the above-mentioned specific operation | movement is the rated wattage output of the rice cooker 1, it can prevent reliably forgetting to test | inspect the rated wattage output of the rice cooker 1, etc.

  Moreover, in the rice cooker 1 of this embodiment, since the above-mentioned specific operation | movement is reception operation | movement of the switch 31 of the rice cooker 1, it can prevent reliably forgetting to test | inspect the reception operation | movement of the key of the switch 31.

  Moreover, in the rice cooker 1 of this embodiment, the capacity | capacitance display and model identification display which can identify the rice cooker 1 are performed by the above-mentioned process display, These figures contain the number and the symbol. For this reason, for example, it is possible to prevent erroneous incorporation of components of the rice cooker 1, such as a controller.

  Moreover, in the rice cooker 1 of this embodiment, since the frequency | count of a power failure is displayed on the above-mentioned process display including a number and a symbol, it becomes possible to identify whether the rice cooker 1 is a new product or a reject product (readjustment product). It is possible to alert workers who perform inspection and confirmation, and to improve quality.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, you may comprise a rice cooker combining the each part of 1st-4th embodiment. Moreover, although the rice cooker was mentioned as an example in 4th Embodiment, this invention is not limited to this, For example, even if applied to various cookers, such as an IH (induction heating) cooker and a microwave oven I do not care. Furthermore, the configuration and shape of each part of the first to fourth embodiments are not limited to those illustrated, and can be changed as appropriate.

1 Rice cooker 5 Pot 12 Heating coil (main heating means)
66 Heater drive element (drive element)
65 Sub heater (sub heating means)
67 Heater drive circuit (drive circuit)

Claims (4)

Main heating means for heating the pot during cooking,
Sub-heating means for heating to prevent dew condensation during heat insulation and cooking,
A drive circuit operating with a DC power source;
In a rice cooker comprising a drive element for turning on / off the energization of the sub-heating means by a drive signal from the drive circuit,
A rice cooker characterized in that the sub-heating means is driven by a DC power source rectified and smoothed from an AC commercial power source. Main heating means for heating the pot during cooking,
Sub-heating means for heating to prevent dew condensation during heat insulation and cooking,
A drive circuit operating with a DC power source;
In a rice cooker comprising a drive element for turning on / off the energization of the sub-heating means by a drive signal from the drive circuit,
A rice cooker characterized in that the sub-heating means is driven by a rectified power source rectified from an AC commercial power source.   The rice cooker according to claim 1 or 2, wherein a bipolar transistor is used as the driving element. The rice cooker according to claim 1 or 2, wherein a field effect transistor is used for the driving element.

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