JP3953045B2 - Electric rice cooker - Google Patents

Description

  The present invention relates to an electric rice cooker that cooks rice by electric heating such as a heater or electromagnetic induction.

  Electric rice cookers have almost the same basic configuration regardless of the heating method. Referring to FIG. 1 showing the present embodiment, a rice cooker 3 that is heated in a vessel 2 that is closed by a lid 1 and is heated and cooked by heating, and the heating is performed. The heating means 4, the temperature sensor 5 which detects the temperature of the rice cooker 3, and the control means 6 which controls the heating means 4 based on the rice cooker temperature which the temperature sensor 5 detects and cooks rice are provided. Electric rice cookers have been provided for a long time, and have been steadily working to cook delicious rice. For example, recently, as shown in FIG. 10, a water absorption process in which rice is absorbed by low heat, a cooking process from boiling to high heat and fuzzy thermal power until the temperature starts to rise rapidly after the water disappears, and is heated to about 130 ° C. Then, the baking process to further blow off excess moisture, and then the temperature is lowered to 115 ° C and maintained for a certain period of time, then the temperature is further lowered to 110 ° C and maintained to maintain the temperature. The steaming process that further promotes alpha conversion and increases sweetness is sequentially performed to finish cooking rice. After cooking the rice, the temperature is lowered to a predetermined temperature, and the process proceeds to a temperature maintaining process for maintaining the temperature.

  Furthermore, the heating control of the rice cooker is different in the model size by making it slightly different depending on the size of the rice cooker, such as 3 rice cooker, 5.5 rice cooker, 7 rice cooker, that is, the maximum rice cooker capacity in the electric rice cooker. (See Patent Document 1, for example).

On the other hand, as electric rice cookers become highly functional and multifunctional, the number of electrical and electronic components mounted on the control system board has increased, causing a cost increase. Therefore, it is also possible to reduce the cost by sharing the control system board for multiple models as much as possible, and to control the mode according to the model difference by changing the mounting position of some common parts. (For example, refer to Patent Document 1).
JP 2003-111666 A

  However, in order to cope with the difference in the control mode for each model by changing the mounting position of some common parts, the mounting parts for the common parts are provided at a plurality of different positions on the control system board as the common part. Therefore, it may happen that the wrong position is selected and mounted, and if this is installed in the product as it is, it will be controlled in the mode of another model, but for the subtle difference, the manufacturer also The discovery takes labor and time, and if it is actually used over the user side, it is difficult to conclude that the control is abnormal, but it may be dissatisfied and distrustful with the cooking situation and how the rice is cooked.

  To cope with this, it is conceivable to distinguish between different models due to the difference in the position of each mounting part by color-coding multiple mounting parts or giving a display corresponding to the model, Such erroneous mounting cannot be mechanically prevented.

  The object of the present invention is to adopt a circuit board common to different models and change the control mode by mounting some common parts at different positions. The object is to provide an electric rice cooker that can be prevented from being incorporated.

In order to achieve the above object, the electric rice cooker of the present invention is a rice cooker that cooks rice by heating in a closed lid, heating means that performs the heating, and a plurality of models equipped with components. A control part that includes a substantially common circuit board and that can cook rice by controlling the heating means in a control mode for each of a plurality of models, and the circuit board includes a common part that is substantially common to a plurality of models. The mounting part is provided at different positions for each of the plurality of models, and the control mode of the control means is specified so as to correspond to the specific model by the difference in the position of the common part mounting part on which the common part of the specific model is mounted, and , provided to the individual component mounting portion is specific position for mounting the discrete parts different for each of the plurality of models, by mounting discrete components corresponding to a particular type in the individual component mounting portion, provided in equipped with individual parts As the Sukingu unit, masking the common component mounting portion corresponding to the other models other than the specific model corresponding thereto, prevents or interfere mechanically contain interfering relationship mounting of the common components of this to the common component mounting portion The main feature is that

  In such a configuration, a circuit board included in the control means for controlling the heating means to cook rice adopts a circuit board that is substantially common to a plurality of models, and a plurality of common parts that are substantially common to a plurality of models are provided on the circuit board. The control means controls the heating means in the mode corresponding to the specific model depending on which of the common part mounting parts in the position is mounted, but the individual parts that differ for each type of circuit board Since it is mounted on the individual component mounting part at a specific position, the common component mounting part on the circuit board corresponding to another model different from the specific model corresponding to this mounted individual part is masked. If an individual part corresponding to a specific model is mounted first, the mounting of the common part on the common part mounting part corresponding to the other model is mechanically blocked, and the common part mounting corresponding to the other model is installed. If a common part is mounted on the part first, the mounted common part mechanically interferes with masking when mounting the individual part corresponding to the specific model, and the individual part corresponding to the specific model And mounting on a specific common component mounting portion corresponding to a specific model of the common component can be mechanically guaranteed.

  Here, when individual parts are mounted first and then common parts are mounted, it may be mechanically regulated so that the common parts are always mounted at a position corresponding to the model specified by the individual parts mounted first. it can.

  If the individual component is a non-control system component, the individual component mounting part can be made different depending on the model without impairing the electrical commonality on the circuit board, which can be advantageous for mounting or masking the individual component. . In this case, the cloth for the circuit board is only classified, and the cost is not particularly increased. However, in the further configuration in which the individual component mounting portion is provided in common for each individual component, the fabric of the circuit board itself is common to a plurality of models.

  The common component is a battery for backup. In a further configuration, the battery can be easily mounted by hand soldering on the circuit board by hand. Circuit boards that are mass-produced by electronic component mounting machines can be electrically At the stage of assembling the rice cooker, the worker can install the battery and assemble it to correspond to the specific model required at that time.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations as much as possible.

  According to the main features of the electric rice cooker of the present invention, the circuit board to be installed is almost common to a plurality of models, and the cost is reduced, while corresponding to a specific model by mounting positions of common parts that are almost common to a plurality of models. In order to secure the control function, it is necessary to mechanically mount a common part corresponding to a specific model by utilizing the correlation between the mounting position corresponding to the specific model of the common part and the mounting of the individual part corresponding to the specific model. It can be ensured and the control means can be surely prevented from having a control function corresponding to another model, and the rice cooking performance and reliability can be made high.

  According to a further configuration in which the individual component mounting portion is provided in common for each individual component, the fabric of the circuit board itself is common to a plurality of models, which is advantageous in terms of handling and cost.

  The common component is a backup battery. According to the further configuration, it is easy to handle and mount by hand, and the freedom to specify the model by mounting the battery at the assembly stage of the electric rice cooker is obtained. It is convenient for manufacturing and quality control, and in some cases, the model specified by the backup power supply from the time when the battery is installed can be displayed.

  Hereinafter, embodiments of the electric rice cooker according to the present invention will be described in detail with reference to FIGS. 1 to 9 to provide an understanding of the present invention.

  The electric rice cooker according to the present embodiment has the basic configuration described above with reference to FIG. 1, but as the heating means 4, the rice cooker 3 is mainly heated by electromagnetic induction to produce the contents. The heating coil 11 to be heated is used, and the heating coil 11 is disposed so as to generate heat at the bottom of the rice cooker 3 and its outer periphery. The heating means 4 also heats the metal inner lid 13 that closes the mouth of the rice cooker 3 with a seal packing 13a inside the lid 1 that closes the body 2 and the heat retaining heater 12 that heats the body of the rice cooker 3. A lid heater 14 is provided in combination to perform various heating processes during rice cooking and heat retention after rice cooking. However, the present invention is not limited to this, and the rice cooker 3 and the inner lid 13 may be heated by electromagnetic induction from a heating coil disposed in each part, or the whole may be heated by a heater. It may be a thing. The heating structure is not particularly limited.

  The heating coil 11 is subjected to high-frequency driving using the switching function of the IGBT 16 mounted on the power source / driving board 15 and is output with a heating capacity necessary at that time. Heating elements such as IGBTs 16 are mounted on the power source / drive substrate 15, and a cooling fan 17 for cooling them is provided in the container 2. Further, in particular, the IGBT 16 that generates a large amount of heat is brought into contact with the heat sink 18 in order to enhance its cooling effect, thereby facilitating cooling. The insulation heater 12 and the lid heater 14 are supplied with 100V AC current as they are through the power source / driving board 15, and are mounted on the control board 23 mounted with the microcomputer 22 provided inside the operation panel 31 provided in the front part of the shoulder. Are configured to supply a necessary direct current to each of them, and these constitute a control means 6.

  The lid 1 applied to the container body 2 is pivotally supported by a hinge pin 131 at the rear part of the container body 2 so that the upper end of the container body 2 can be opened and closed. A spring 33 that urges the lid 1 in the opening direction is operated between the lid 1 and the body 2. A brake mechanism for braking the opening operation by the bias of the spring 33 is provided as necessary, and a lock claw 34 biased by a spring (not shown) is provided so as to lock the lid 1 in a closed position so that the lid 1 does not open freely. Then, the lid 1 is automatically opened by the bias of the spring 33 by rotating the lock claw 34 against the spring.

  The inner lid 13 is fitted to the lower surface of the lid 1, the seal packing 13 a is sandwiched and held at the fitting boundary portion, and the lid heater 14 is provided on the upper surface of the inner lid 13 to bypass the hinge pin 131 and is not shown. Power is supplied from the side of the body 2 via A steam passage 37 is provided in the center of the lid 1 to allow steam to escape to the outside in an appropriate manner so that delicious rice can be cooked. The outer wall 41 and the inner wall 42 of the vessel body 2 are connected and integrated at their upper ends by a shoulder member 43 to constitute a vessel made of synthetic resin. Synthetic resin has magnetic permeability, and is effective if the heating coil 11 or the like is provided in a range where the rice cooker 3 is electromagnetically heated, but there is no such effectiveness in other parts, and other members and Can be substituted.

  The lid 1 has a heat insulating structure in which a space between the upper plate 44 and the lower plate 45 made of synthetic resin is filled with a heat insulating material 46, and the inner lid 13 and the upper plate 44 that are fitted to the center of the lower plate 45. A passage upper portion 37a of the steam passage 37 is provided on the upper plate 44 side in the center, and a synthetic resin passage lower portion 37b of the steam passage 37 is formed on the passage upper portion 37a from below by using an elastic bush 49 or the like. It is fitted so that it can be removed. Accordingly, the lid 1 can be removed and cleaned, and the passage lower part 37b can be removed alone and washed. The body 2 further incorporates a take-up reel 51 for a power cord, and is pivotally supported externally so that a hand handle 52 can be raised and lowered.

  Around the bottom of the inner wall 42 of the vessel body 2, a synthetic resin-made radial coil base 53 is arranged to hold the heating coil 11 from below. A ferrite core 54 is provided in a downward concave portion formed in each radial portion of the coil base 53 to assist the function of the heating coil 11. In the central part of the coil base 53, the temperature sensor 5 passes through the central hole 55 of the inner wall 42 and comes into contact with the bottom of the rice cooker 3 so as to detect the temperature of the rice cooker 3.

  As shown in FIG. 1, the operation panel 31 is provided with various operation keys 64 using a resin spring by a lens-type liquid crystal display window 62 or a cut-out portion, a lamp display portion, and the like. The various switches 63 as shown in FIG. 3 (a) mounted on the upper surface of the control board 23 are arranged to correspond directly below the operation keys 64, and the corresponding operation keys 64 are operated and operated. Various cooking menus such as rice cooking, which are turned on and off in response to the release, reflected in the control circuit formed by the printed wiring and the mounted components provided on the back surface of the control board 23 shown in FIG. Set the operation mode, start cooking, etc.

  As shown in FIG. 3 (b), the microcomputer 22 performs various cooking such as rice cooking according to the input from the operation panel 31, based on the temperature information from the temperature sensor 5, the heating coil 11, and the heat insulation. The heater 12, the lid heater 14 and the cooling fan 17 are driven via respective drivers 71, 72, 73 and 74.

  In the present embodiment, in particular, the control means 6 includes the control board 23 described above as a circuit board that is almost common to a plurality of models on which components are mounted, and this control board 23 is almost common to a plurality of models. The common component mounting portions 82a, 82b,... For mounting the common component 81 shown in FIGS. 3 (a), 3 (b), and 4 are provided at different positions for a plurality of models to mount the common component 81 of a specific model. 2, 3 (a), (b), wherein the control mode of the control means 6 is specified so as to correspond to a specific model due to the difference in position of the common component mounting part 82 a or 82 b, and is different for each of a plurality of models. The individual component mounting portion 84 for mounting the individual component 83 as shown in FIG. 4 is provided at a specific position, and the individual component mounted by mounting the individual component 83 corresponding to the specific model on the individual component mounting portion 84 is provided. 83 to this Is a common component mounting portion 82a or 82b corresponding to the other models other than the specific type of response to be masked. The illustration shows an example in which two common component mounting portions 82a and 82b are provided for simplicity of explanation, and the number and form thereof are not particularly limited. In short, by selectively mounting the common component 81 on the common component mounting portions 82a and 82b in different positions for a plurality of models, the relationship with the printed circuit on the control board 23 according to the difference in the mounting position, the components As long as at least one of the signal line, the operation line, the power supply line, and the like in the control means 6 that has not been specified due to the relationship between the operation mode and the operation mode corresponding to the specific model can be obtained.

  Thus, the control board 23 as a circuit board included in the control means 6 that controls the heating means to cook rice is adopted as a common part for a plurality of models, and a common component 81 that is substantially common to the plurality of models is provided. The control means 6 controls the heating means 4 in a mode corresponding to a specific model depending on which of the common component mounting portions 82a and 82b at a plurality of positions on the control board 23 is mounted so that cooking such as rice cooking can be performed. However, the individual components 83 that are different for each of the plurality of models are mounted on the individual component mounting portion 84 at a specific position of the control board 23 as shown in FIGS. Since the common component mounting portion 82b on the control board 23 corresponding to another model different from the specific model corresponding to the mounted individual component 83 is masked, the individual component 83 corresponding to the specific model is the first. If it is mounted, mounted for common parts 81 shown in phantom in Figure 4 to the common component mounting portion 82b corresponding to the other models are mechanically blocked. Further, if the common component 81 is first mounted on the common component mounting portion 82b corresponding to another model, the common component mounted on the common component mounting portion 82b is mounted on the individual component 83 corresponding to the specific model. This masks the masking of the common component mounting portion 82b. Accordingly, it is possible to mechanically guarantee the mounting of the individual component 83 corresponding to the specific model and the mounting of the common component 81 on the specific common component mounting portion 82a corresponding to the specific model. Here, when the individual component 83 is first mounted and then the common component 81 is mounted thereafter, the common component 81 is mechanically mounted so that the common component 81 is always mounted at a position corresponding to the model specified by the previously mounted individual component 83. Can be regulated.

  Therefore, it is common to secure the control function corresponding to the specific model by the mounting position of the common component 81 that is almost common to the plurality of models while reducing the cost by making the control board 23 to be equipped almost common to the plurality of models. Using the mutual relationship between the mounting position of the component 81 corresponding to the specific model and the mounting of the individual component 83 corresponding to the specific model, the mounting of the common component 81 corresponding to the specific model is mechanically guaranteed, and the control means 6 It is possible to reliably prevent the control function corresponding to other models from being provided, and to improve the rice cooking performance and reliability.

  However, the circuit state corresponding to one model is specified without mounting the common component 81, and the common component 81 can be selectively applied to the common component mounting portions 82a, 82b corresponding to a plurality of other models. It is possible to switch to a circuit state corresponding to one of a plurality of other models by mounting. In this case, since no new common component 81 is mounted on the circuit state specified from the beginning, the individual component 83 mounted on the individual component mounting portion 84 is a plurality of common component mounting portions provided on the control board 23. It is necessary to mask all of 82a, 82b,... So that the common component 81 is not mounted.

  Further, by making the individual component 83 a non-control system component, the individual component mounting portion 84 is made different depending on the model without impairing the electrical commonality on the control board 23, and mounting or masking of the individual component 83 is performed. Can be advantageous. In this case, the cloth for the circuit board is only classified, and the cost is not particularly increased. However, as shown in the illustrated example, the individual component mounting portion 84 is provided in common for each individual component 83, so that the fabric of the control board 23 is also common to a plurality of models.

  In the illustrated example, a backup battery 81a is adopted as the common component 81. The battery 81a is easy to be manually mounted on the control board 23 by hand and is mass-produced by an electronic component mounting machine or the like. The control board 23 can be assembled at the assembly stage of the electric rice cooker so that an operator can mount the battery 81a and correspond to a specific model required at that time. Therefore, the battery 81a is mounted at the stage of assembling the electric rice cooker, and the degree of freedom to specify the model is obtained, which is convenient for manufacturing and quality control of the product. In some cases, it is specified by the backup power supply from the time when the battery 81a is mounted. The model etc. can be displayed. For this reason, the common component mounting portions 82a and 82b are provided as holes for inserting the pair of connection terminals 81b of the battery 81a, and the connection terminals 81b of the battery 81a are inserted into the holes and soldered to the printed wiring on the control board 23. So that it can be installed. In this case, the electrons 81a are inserted and mounted from the printed wiring surface side, that is, the lower surface side of the control board 23, so that it is easy to avoid interference with many components on the upper surface side.

  Further, the individual parts 83 in the illustrated example are the non-control system parts described above, and the degree of freedom in selecting the shape, structure, material, mounting structure on the control board 23, etc. within a range that does not adversely affect the control system. It is easy to design, and it is possible to select parts that are convenient for distinguishing, mounting, and visual recognition of mounting / non-mounting. Also, a common part mounting portion 82b corresponding to another model is provided to integrally form a mask portion 83a for masking as shown in FIGS. 3A and 3B or FIG. Cheap. More specifically, the supporting member 83b of the liquid crystal display 91 as shown in FIGS. 1 and 3A provided on the control board 23 is made of synthetic resin and is suitable for handling as a large individual component 83. While supporting the liquid crystal display 91 common to the models and being mounted on the control board 23, a plurality of compact designs designed as shown in FIG. It is possible to effectively use different parts 83 for each model, and the mask part 83a is formed in a rib shape as shown in the figure, or integrally formed with a necessary shape and size such as a cover shape. Thus, the required number can be easily provided. The support member 83b is made of synthetic resin, and a plurality of hooks 83c as shown in FIGS. 1 and 4 for mounting on the control board 23 are integrally formed together with the mask portion 83a. The control board 23 is mounted irrespective of the control system by being inserted into a plurality of holes formed as individual component mounting portions 84.

  Moreover, when the support member 83b, which is such an individual component 83, is assembled in a model other than the corresponding model, the design and the size and shape of the limit of the support member 83b, the control board 23 of the rice cooker It is found that the mounted support member 83b is of a different model because it is not assembled due to interference with the surroundings of the equipment. However, such an interference relationship can be configured exclusively for determination as an erroneous mounting determination unit. For example, it can be stated that if the support member 83b is erroneously mounted, the specific switch 63 does not operate normally or the operation key 64 does not function normally.

  As shown in FIG. 5A, when the mask portion 83a is fitted to a hole portion that forms a common component mounting portion 82b of another model that is not the model specified by mounting the individual component 83, The mounting of the common component 81 indicated by the virtual line corresponding to can be more reliably prevented. In addition, it is possible to avoid the inconvenience that the mounting operation of the common component 81 indicated by the phantom line is prevented and the control board 23 that has been recently mounted with high-density wiring and high-density mounting is damaged. In this case, as shown in FIG. 5 (b), when the mask portion 83a is fitted into the extended portion 82c of the hole portion forming the common component mounting portions 82a and 82b including a part of the hole portion, Masking with a fitting portion with the hole portion can be performed by using the expanded portion of the hole portion by the mask portion 83a having a larger cross section than the hole portions of the mounting portions 82a and 82b.

  In the example of FIG. 5A, the mask part 83a and the hook 83c are further shared, and therefore the mounting parts 82b and 84 also share one hole. Therefore, the single individual component mounting portion 84 indicated by the broken line in FIG. 5 corresponding to the individual component mounting portion 84 in the illustrated example of FIG. 4 is not necessary. It can also be applied to the example shown in FIG.

  In the example shown in FIG. 6, in addition to the example shown in FIG. 4, the common part 81 is mounted on the common part mounting part 82 a together with the mask part 83 a masking the common part mounting part 82 b on the individual part 83. A guide portion 83d that guides a single side is integrally formed. Accordingly, it is easy to prevent damage to a dense wiring pattern or a mounted component due to shaking, vibration, or inclination of the battery 81a when the thin and thin connection terminal 81b of the battery 81a is inserted into the hole and mounted. In addition, if the protrusion 102 etc. which interfere with the main body 101 of the model which this does not fit to the individual component 83 as shown by the phantom line is formed, the control board 23 in which the individual component 83 is incorrectly mounted on the main body. It can be prevented from being incorporated.

  In the example shown in FIG. 7, a cylindrical guide portion 83f that receives and guides the connection terminal 81b is provided instead of the example shown in FIG. I am trying to do it.

  In the example shown in FIG. 8, when the battery 81a is mounted on the upper surface of the control board 23, the function of preventing erroneous mounting on the common component mounting portion 82b of the battery 81a due to the interference with the boss portion 83a of the individual component 83 can be enhanced. The protrusion 103 provided on the main body 101 side and the battery 81a erroneously mounted on the common component mounting portion 82a can interfere with each other so that they cannot be incorporated into the main body of the control board 23.

  In the example shown in FIG. 9, the hole of the common component mounting portion 82b is masked with the jumper wire 104 as the individual component 83 so that the battery 81a indicated by the virtual line cannot be mounted. Such masking can be performed by using other parts such as resistors and jumper switches as the individual parts 83.

  Note that the specific operation method corresponding to each model size of circuit members common to different models as described above can also be applied to other circuit boards such as the power supply / drive board 15.

  INDUSTRIAL APPLICABILITY The present invention can be practically used in an electric rice cooker and can avoid problems due to erroneous mounting of components that make a circuit board common to different models correspond to a specific model.

It is sectional drawing of the electric rice cooker which concerns on embodiment of this invention. It is the bottom view of the inside which removed the bottom of the electric rice cooker of FIG. It is the top view of the control board of the electric rice cooker of FIG. 1, and the block diagram of a control circuit. It is sectional drawing which shows one example of the mounting relationship of the individual components and common components in the control board in the electric rice cooker of FIG. It is sectional drawing which shows another example of the mounting relationship of the separate components and common components in the control board in the electric rice cooker of FIG. 1, and a top view which shows the modification. It is sectional drawing which shows the other example and modification of the mounting relationship of the individual components and common components in the control board in the electric rice cooker of FIG. It is sectional drawing which shows another example of the mounting relationship of the individual components and common components in the control board in the electric rice cooker of FIG. It is sectional drawing which shows another example of the mounting relationship of the separate components and common components in the control board in the electric rice cooker of FIG. It is sectional drawing which shows the further another example of the mounting relationship of the individual components and common components in the control board in the electric rice cooker of FIG. It is a time chart which shows the example of heating control from the rice cooking of the electric rice cooker of FIG. 1 to heat retention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lid 2 Body 3 Rice cooker 4 Heating means 6 Control means 11 Heating coil 12 Thermal insulation heater 13 Inner lid 14 Lid heater 22 Microcomputer 31 Operation panel 81, 81a Common component 82a, 82b Common component mounting part 83, 83b, 104 Individual Parts 83a Mask part 83b Hook 84 Individual parts mounting part

Claims (3)

Includes a rice cooker that cooks rice by heating in a closed container, a heating means that performs the heating, and a circuit board that is substantially common to a plurality of models equipped with components, and controls the heating means for each of the plurality of models. Control means capable of cooking rice controlled in the mode,
The circuit board has a common component mounting part that mounts common parts that are almost common to multiple models at different positions for each model, and the difference in the position of the common component mounting part that loads the common parts of a specific model The control mode of the control means is specified so as to correspond to a specific model, and an individual component mounting part for mounting different individual parts for each of the plurality of models is provided at a specific position. by mounting a discrete component corresponding to the masking portions provided on the mounting and distinct components, masking the common component mounting portion corresponding to the other models other than the specific model corresponding thereto, of the to the common component mounting portion An electric rice cooker characterized in that mounting of common parts is mechanically blocked or disturbed including interference . 2. The electric rice cooker according to claim 1, wherein one type of individual component mounting portion is provided in common for each individual component. The electric rice cooker according to any one of claims 1 and 2, wherein the common component is a backup battery.

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