JP4879222B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker including a heating coil composed of an inner coil and an outer coil whose central axes are substantially the same.

  As a conventional induction heating cooker, a linear light emitter having light sources at both ends is provided on the outer periphery of the heating coil, the light source is turned on at the start of cooking, and the linear light emitter emits light. It is made clear (for example, refer patent document 1).

JP 2004-265880 A (page 7, FIG. 6)

  In the above-described conventional technology, since only one ring-shaped linear light emitter is provided on the outer periphery of the heating coil, there is a problem that the amount of information that can be displayed is small depending on the situation and there is a limit. . In addition, it is desirable that information related to the object to be heated is displayed at a position close to the object to be heated so that the user can intuitively understand. It is difficult to use a linear light emitter.

  The present invention has been made to solve the above-described problems, and provides an induction heating cooker capable of displaying easily in accordance with the shape, material, or state of the heated object in the vicinity of the heated object. For the purpose.

The induction heating cooker according to the present invention is installed in the upper part of the cooker main body, and is arranged below the top plate for placing the object to be heated, and has a different diameter with substantially the same central axis. A heating coil formed of an inner coil and an outer coil, and an outer periphery of the outer coil when the heating coil is viewed from the top plate side, and arranged between the outer periphery of the inner coil and the inner periphery of the outer coil, respectively. A heating coil formed from a plurality of substantially ring-shaped light emitters that irradiate light toward the top plate and side plates facing each other with a gap on both sides of the light emitters disposed between the inner coil and the outer coil. The cooling air introduction path that introduces a part of the cooling air that is blown for cooling and the size of the object to be heated are detected, and a light emitter based on the detection result is selected from a plurality of light emitters. And control means for emitting light.

The induction heating cooker according to the present invention is installed in the upper part of the cooker main body, and is arranged below the top plate for placing the object to be heated, and has a different diameter with substantially the same central axis. A heating coil formed of an inner coil and an outer coil, and an outer periphery of the outer coil when the heating coil is viewed from the top plate side, and arranged between the outer periphery of the inner coil and the inner periphery of the outer coil, respectively. A heating coil formed from a plurality of substantially ring-shaped light emitters that irradiate light toward the top plate and side plates facing each other with a gap on both sides of the light emitters disposed between the inner coil and the outer coil. A substantially ring-shaped cooling air introduction path for introducing a part of the cooling air blown for cooling to the heater, and a heated object mounted on the top plate when energizing the heating coil is suitable for induction heating If an inappropriate object to be heated is detected, multiple light emitters are detected. There are those comprising a control means for emitting to be different from the light emitting state when it detects the proper one of the light emitters.

The induction heating cooker according to the present invention is installed in the upper part of the cooker main body, and is arranged below the top plate for placing the object to be heated, and has a different diameter with substantially the same central axis. A heating coil formed of an inner coil and an outer coil, and an outer periphery of the outer coil when the heating coil is viewed from the top plate side, and arranged between the outer periphery of the inner coil and the inner periphery of the outer coil, respectively. Formed of a plurality of substantially ring-shaped light emitters for irradiating light toward the top plate, and side plates facing each other with a gap on both sides of the light emitters disposed between the inner coil and the outer coil, Detects whether or not the substantially ring-shaped cooling air introduction path for introducing a part of the cooling air blown to the heating coil for cooling and whether the heated object is displaced or whether it is separated from the top plate. Control means for changing the light emission state of the plurality of light emitters according to the result; Those were example.

  According to the present invention, the heating coil is disposed so as to be positioned between the outer periphery of the outer coil and the outer periphery of the inner coil and the outer periphery of the outer coil when viewed from the top plate side, and the light is directed toward the top plate. Since a plurality of substantially ring-shaped light emitters to be irradiated are provided, it becomes possible to perform easy-to-understand display according to the shape, material, or state of the heated object.

Embodiment 1 FIG.
FIG. 1 is an external perspective view of an induction heating cooker showing Embodiment 1 of the present invention, FIG. 2 is a plan view showing a partially crushed top plate of the induction heating cooker according to Embodiment 1, and FIG. Sectional drawing which shows the positional relationship of the induction coil of the induction heating cooking appliance which concerns on Embodiment 1, and a light-emitting body, FIG. 4 is a top view which shows the coil base of the induction heating cooking appliance which concerns on Embodiment 1, FIG. It is a top view which shows the buoyancy suppression board of the induction heating cooking appliance which concerns on the form 1.
In these drawings, a top plate 2 made of heat-resistant tempered glass having high heat resistance and light transmittance is installed on the upper portion of the cooker body 1. On the top surface of the top plate 2, an inner diameter ring line 3 and an outer diameter ring line 4 having substantially the same central axis are printed at two locations as one heating port, and a small diameter ring line 5 is printed at the rear center. Yes. The inner diameter ring line 3 indicates the placement position of a heated object (for example, a pan) with a small diameter that can be induction-heated, and the outer diameter ring line 4 indicates the placement position of the heated object with a large diameter.

  Since the top plate 2 is light-transmitting as described above, for example, a ring display window formed on the outer periphery of the inner diameter ring line 3 and the outer diameter ring line 4, the upper part of the heater (inside the ring line 5), and 3 described later. Except for the two cooking function display windows, the entire back surface is painted. This is to prevent the inside of the cooker body 1 from being seen. The above-described ring display window transmits light from a light emitter described later, and the ring display window on the outer diameter ring line 4 side is wider than the ring display window on the inner diameter ring line 3 side.

  Two heating coils 6 centering on the central axes of the inner and outer diameter ring lines 3 and 4 are arranged in the cooker main body 1 below the top plate 2. A heater (not shown) around the central axis of the ring line 5 is installed. On the left side of the front surface of the cooker body 1, a grill portion is provided in which the door 7 can slide back and forth. The above-described three cooking function display windows 8 and 9 are formed on the front side of the top plate 2. Among these display windows 8 and 9, the cooking function display windows 8 on both sides are provided with a liquid crystal display (not shown) for the heating coil 6 on the back surface, and the center display window 9 has a heater and grill. A liquid crystal display (not shown) that is used together is disposed.

  On the front side of the cooking device main body 1 is provided an upper surface operation unit 10 in which various switches are arranged corresponding to the two heating coils 6 and the grill part. There is provided a front operation unit 11 on which a heating power adjustment dial for finely adjusting the heating power of the heating coil 6 and the heater, a power switch for turning on and off the power, and the like are arranged.

  The heating coil 6 described above is formed by an inner coil 6a and an outer coil 6b having different diameters around the central axis, and the inner coil 6a and the outer coil 6b are arranged on the coil base 12 so that they are substantially on the same plane. (See FIG. 3). As shown in FIG. 4, the coil base 12 includes a ring plate 12 c connected to a disc 12 a centered on the central axis of the heating coil 6 and a connecting plate 12 b formed extending at least in three directions from the disc 12 a. A ring-shaped side plate 12d formed on the outer edge of the ring plate 12c in the direction of the top plate, and a substantially ring-shaped cooling air formed from the side plates facing each other on the outer edge of the circular plate 12a and the inner edge of the ring plate 12c. And an introduction path 12e.

  When the heating coil 6 is viewed from the top plate 2 side, the substantially ring-shaped light emitter 13 is located between the outer periphery of the outer coil 6b and the side plate 12d of the coil base 12 and between the inner coil 6a and the outer coil 6b. , 14 (hereinafter, the light emitter 13 is referred to as “inner light emitter 13” and the light emitter 14 is referred to as “outer light emitter 14”), of which the inner light emitter 13 has a coil base as shown in FIG. The cooling air introduction passages 12 e are arranged at positions lower than the upper end of the outer light emitter 14. The inner light emitter 13 and the outer light emitter 14 include, for example, light guide paths 13a and 14a having a quadrilateral cross section, and light source LEDs 13b and 14b attached to both ends of the light guide paths 13a and 14a, respectively. . The light guide paths 13a and 14a have a light emitting surface that emits light of the LEDs 13b and 14b upward, and a light reflecting layer is provided on the surface facing the light emitting surface. Further, the light guide path 14 a of the outer light emitter 14 is formed to have a wider width (light emitting surface) than the light guide path 13 a of the inner light emitter 13.

  A buoyancy suppression plate 15 is disposed between the top plate 2 and the heating coil 6 as shown in FIG. The buoyancy suppression plate 15 is a member (for example, an aluminum plate) for suppressing the floating of the heated object due to the electromagnetic force of the heating coil 6, and is centered on the central axis of the heating coil 6 as shown in FIG. And a ring plate 15c connected to a connecting plate 15b formed extending from the disc 15a in at least three directions. With this configuration, the buoyancy suppression plate 15 is formed with three openings 15 d that extend in the circumferential direction.

  Further, below the coil base 12, there is provided a planar circular cooling air ejection portion 16 that ejects the cooling air upward (see FIG. 3). The cooling air jet part 16 has a plurality of holes arranged in a circumferential direction and a radial direction around the central axis of the heating coil 6. A fan motor (not shown) for cooling the inside of the 1 is provided.

Next, the operation of the first embodiment will be described with reference to FIGS. FIG. 6 is a schematic block diagram for explaining the operation of the first embodiment, FIG. 7 is a plan view showing an example of a ring display window that is turned on according to the size of the pan, and FIG. It is a flowchart which shows operation | movement.
When the heated body is turned on after the object to be heated is installed in either the inner ring ring line 3 or the outer ring ring line 4 printed on the top plate 2, the control unit 20 It is determined whether the power of the coil 6 has been set (S1). When the power setting is detected, the inverter circuit 21 (for example, a full-bridge inverter) is driven by a drive signal having a higher frequency than that during the heating operation so that the outer coil 6b of the heating coil 6 set with power is output at low power. Drive (S2). The detection current (input current) of the current detection means provided on the input side in the AC / DC conversion circuit 22 and the detection current (coil current) of the coil current detection means provided in the inverter circuit 21 are used as predetermined information. Read (S3), for example, the ratio of the coil current to the input current (= input current / coil current) is calculated (S4) and compared with a preset threshold value (S5).

  When the calculated ratio is equal to or less than the threshold value, the LED 13b mounted at both ends of the inner light emitter 13 is turned on by determining that the heated object has a small diameter (S6). By turning on the LED 13b, light is emitted from the light emitting surface of the light guide 13a, and the ring display window 3a formed on the outer periphery of the inner ring line 3 emits light as shown in FIG. 7B. When the ring display window 3a on the inner diameter ring line 3 side is caused to emit light, the control unit 20 stops energizing the outer coil 6b (S7), so that the previously set power is output only from the inner coil 6a. The inverter circuit 21 is controlled (S8). When the ratio of the coil current to the input current is higher than the threshold value, the LED 14b attached to both ends of the outer light emitter 14 is turned on by determining that the heated body has a large diameter (S9). By turning on the LED 14b, light is emitted from the light emitting surface of the light guide path 14a, and the ring display window 4a formed on the outer periphery of the outer diameter ring line 4 emits light as shown in FIG. 7A. In this case, the ring display window 4a having a larger width than the inner diameter ring line 3 side emits light. When the ring display window 4a on the outer diameter ring line 4 side is caused to emit light, the control unit 20 controls the inverter circuit 21 so that the previously set power is output by the inner coil 6a and the outer coil 6b ( S10).

  Thereafter, the control unit 20 drives a fan motor provided in the cooker body 1 (S11), and the cooling air generated by driving the fan motor is ejected from a plurality of holes provided on the upper surface of the cooling air ejection unit 16. The temperature rise around the heating coil 6 is suppressed. In this case, part of the cooling air flows into the cooling air introduction passage 12e formed in the coil base 12, and the temperature rise of the inner light emitter 13 disposed in the cooling air introduction passage 12e is suppressed. Further, since the inner light emitter 13 is disposed in the cooling air introduction path 12e, the influence of heat generated from the heating coil 6 is reduced.

  Further, the buoyancy suppression plate 15 gradually increases in temperature with the start of heating and becomes very high temperature, so it is necessary to consider the influence of heat on the light emitter. Here, a gap is provided between the outer periphery of the inner coil 6a and the inner periphery of the outer coil 6b, and the magnetic field is weaker in this gap portion than directly above the coil, and therefore there is no buoyancy suppression plate 15 in this portion. Is less affected by buoyancy generated in the heated object than when not directly above the coil. Therefore, a hole is provided in the buoyancy suppression plate 15 corresponding to this gap portion, and the influence of heat on the inner light emitter 13 is reduced by suppressing heat generation in this portion.

  As described above, according to the first embodiment, since the inner light emitter 13 is provided between the outer periphery of the inner coil 6a and the inner periphery of the outer coil 6b, a simple induction heating coil output display by the outer light emitter 14 is provided. Information display according to the shape of the object to be heated, not information, can be performed more appropriately. In particular, when a small-diameter target to be heated is placed, it is possible to display at a position closer to the target to be heated using the inner light emitter 13, so that the user can easily understand the information intuitively. Previously, the space on the coil was thought to be unsuitable for display because it was hidden by the object to be heated during normal use, but this embodiment makes good use of this space to provide more easily understandable information. It is excellent in that it can be provided, and the influence of heat on the light emitter can be reduced as described later.

  Further, based on predetermined information obtained when the heating coil 6 is energized, when the diameter of the heated object is small, the inner light emitter 13 is turned on to cause the ring display window 3a on the inner diameter ring line 3 side to emit light, and the heated object Since the outer light emitter 14 is turned on and the ring display window 4a on the outer diameter ring line 4 side is made to emit light when the diameter is large, the outer light emitter 14 should be placed at an optimum position according to the size of the object to be heated. For this reason, it is possible to suppress a decrease in efficiency due to the shift of the optimum mounting position.

  Further, since the widths of the light guide path 14a of the outer light emitter 14 and the ring display window 4a on the outer diameter ring line 4 side are thicker than those on the inner light emitter 13 side, the ring display window 4a on the outer diameter ring line 4 side is covered. Even if such a heated body is placed, the amount of light leaking outward from the bottom of the heated body increases, so that it is easy to confirm the placement position of the heated body.

Moreover, in this Embodiment, the influence of the heat | fever from the heating coil 6 to the inner light-emitting body 13 is suppressed by providing the inner light-emitting body 13 between the outer periphery of the inner coil 6a and the inner periphery of the outer coil 6b. Can do.
When another light emitter (inner light emitter) is provided inside the outer light emitter 14, it is outside the outer periphery of the inner coil 6a and above the outer coil 6b, that is, between the outer coil 6b and the top plate 2. However, in such a case, the light emitter is sandwiched between the top plate 2 (or the object to be heated) and the outer coil 6b at a high temperature. Must withstand harsh thermal conditions. In addition, since the space between the outer coil 6b and the top plate 2 is increased by the amount of the light emitter, there is a problem that the heating efficiency is lowered. In contrast, in the induction heating cooker of the present embodiment, the inner light emitter 13 is provided between the outer periphery of the inner coil 6a and the inner periphery of the outer coil 6b as described above, so that the inner light emission from the heating coil 6 is achieved. There exists the characteristic that the influence of the heat to the body 13 can be suppressed.

  Further, the inner light emitter 13 positioned between the inner coil 6 a and the outer coil 6 b is disposed at a position lower than the upper end of the outer light emitter 14 and is housed in a cooling air introduction path 12 e formed in the coil base 12 for cooling. Since wind is introduced, temperature rise due to heat generated from the heating coil 6 can be suppressed. Furthermore, since the three buoyancy suppression plates 15 disposed between the top plate 2 and the heating coil 6 are provided with three openings 15d formed in the circumferential direction, the air permeability between the coil base 12 and the coil base 12 is improved. The inner light emitter 13 can be protected from high temperatures.

Embodiment 2. FIG.
In the first embodiment, the light emitter is switched according to the size of the heated object. However, in the second embodiment, it is determined that the heated object placed on the top plate 2 is not suitable for induction heating. When this is done, the fact is notified through the illuminant. In addition, in Embodiment 2, since it is the same structure as the induction heating cooking appliance of Embodiment 1 demonstrated in FIGS. 1-7, description is abbreviate | omitted and hereafter, operation | movement is demonstrated using FIG. FIG. 9 is a flowchart showing the operation of the second embodiment.

  When the cooker is turned on, the control unit 20 enters detection / determination as to whether or not the heated object placed on the top 2 is suitable for induction heating. First, it is determined whether or not the power of the heating coil 6 has been set (S21). When the power setting is detected, the heating coil 6 is configured so that the inner coil 6a of the heating coil 6 is output with low power than during the heating operation. The inverter circuit 21 (for example, a full bridge type inverter) is driven by a high frequency drive signal (S22). Next, the input current detected by the current detection means provided on the input side in the AC / DC conversion circuit 22 and the coil current detected by the coil current detection means provided in the inverter circuit 21 are detected as predetermined information. The ratio of the coil current to the input current (= input current / coil current) is calculated (S24) and compared with a preset threshold value (S25).

  For example, when the ratio is higher than the threshold value, it is determined that it is suitable for induction heating and, for example, the process of determining the size of the object to be heated is entered (S30). It is judged that it is not, and it is determined whether the to-be-heated body on the top plate 2 is an accessory (knife, spoon, etc.) below a prescribed size (S26). This determination is performed by collating data (current value) of a criterion for a small item set in advance with the input current and coil current detected previously. When it is determined that the object to be heated is not a small article of a specified size or less, the LEDs 13b and 14b of the inner light emitter 13 and the outer light emitter 14 are blinked as a result of the material such as aluminum or earthenware pan (S28). .

  At this time, the light emitted from the ring display windows 3a and 4a having different widths formed on the outer circumferences of the inner diameter ring line 3 and the outer diameter ring line 4 on the top plate 2 blinks to notify the user of that fact. . If it is determined that the object to be heated is a small object having a size smaller than the specified size, for example, only the LED 13b of the inner light emitter 13 blinks (S27). In this case, the light emitted only from the ring display window 3a formed on the outer periphery of the inner diameter ring line 3 on the top plate 2 blinks to notify the user to that effect. When the LEDs 13b and 14b of the inner light emitter 13 and the outer light emitter 14 are blinked or only the LED 13b of the inner light emitter 13 is blinked, the controller 20 stops the control of the inverter circuit 21 and The energization to the coil 6a is stopped (S29).

As described above, according to the second embodiment, since the inner light emitter 13 is provided between the outer periphery of the inner coil 6a and the inner periphery of the outer coil 6b, there is little information such as simple induction heating coil output display by the outer light emitter 14. Instead, more appropriate information display according to the state and properties of the heated object such as the material and shape of the heated object can be performed.
Further, when it is determined based on predetermined information obtained when the heating coil is energized that the object to be heated placed on the top 2 is a material not suitable for induction heating, the inner light emitter 13 and the outer light emitter 14. When the LED 13b, 14b is flashed and the object to be heated is determined to be a small object of a specified size or less, only the LED 13b of the inner light emitter 13 is blinked, so that the user can easily understand the object to be heated that cannot be heated. In addition, the cause can be limited and notified, and the safety is improved.

  Further, since the widths of the light guide path 14a of the outer light emitter 14 and the ring display window 4a on the outer diameter ring line 4 side are thicker than those on the inner light emitter 13 side, the ring display window 4a on the outer diameter ring line 4 side is covered. Even if such a heated body is placed, the amount of light leaking outward from the bottom of the heated body increases, so that it is easy to confirm the placement position of the heated body.

  In addition, the inner light emitter 13 positioned between the inner coil 6a and the outer coil 6b is disposed at a position lower than the upper end of the outer light emitter 14, and is housed in a cooling air introduction path 12e formed in the coil base 12 so that the cooling air Therefore, the temperature rise due to the heat generated from the heating coil 6 can be suppressed. Furthermore, since the three buoyancy suppression plates 15 disposed between the top plate 2 and the heating coil 6 are provided with three openings 15d formed in the circumferential direction, the air permeability between the coil base 12 and the coil base 12 is improved. The inner light emitter 13 can be protected from high temperatures.

  In the second embodiment, the reason why the object to be heated cannot be heated is that the LED 13b, 14b of the inner light-emitting body 13 and the outer light-emitting body 14 blinks when it is caused by the material. However, the present invention is not limited to this. For example, when it is caused by the material, the LEDs 13b and 14b of the inner light emitter 13 and the outer light emitter 14 are alternately arranged. The LED 14b of the outer light emitter 14 may be blinked. Further, in the case of small items, in addition to blinking of the LED 13b of the inner light emitter 13, the LED 14b of the outer light emitter 14 may be turned on. Furthermore, the reason why the heated object cannot be heated may be identified by changing the blinking cycle.

Embodiment 3 FIG.
In the third embodiment, heating is being performed when the heated object is removed from the ring line of the top plate 2 during induction heating, or when the tilting operation of lifting or placing the heated object from the top plate 2 is repeated. This is notified by changing the light emission state of the light emitter. In addition, in Embodiment 3, since it is the same structure as the induction heating cooking appliance of Embodiment 1 demonstrated in FIGS. 1-7, description is abbreviate | omitted and hereafter, operation | movement is demonstrated using FIG.10 and FIG.11. To do. FIG. 10 is a plan view showing a lighting example of a ring display window for explaining the third embodiment, and FIG. 11 is a flowchart showing an operation of the third embodiment. FIG. 10 shows an example of a ring display window that is turned on in response to the tilting operation of the heated object.

  For example, the control unit 20 turns on the LED 14b of the outer light emitter 14 according to a heated object having a large diameter, and causes only the ring display window 4a on the outer diameter ring line 4 side to emit light as shown in FIG. If the ratio of the input current to the coil current (= input current / coil current) is equal to or less than a preset threshold value (S32), it is determined that the object to be heated has moved away from the top plate 2. In this case, since the LED 14b of the outer light emitter 14 is turned on in S31 (S33), the LED 13b of the inner light emitter 13 is turned on, and as shown in FIG. In addition to the light emission of the display window 4a, the ring display window 3a on the inner diameter ring line 3 side also emits light. If the LED 13b of the inner light emitter 13 is turned on in S31, the LED 14b of the outer light emitter 14 is turned on (S35). Thereafter, when the ratio between the input current and the coil current (= input current / coil current) becomes higher than the threshold value, it is determined that the heated object is placed on the top plate 2 again, and the LED lit in S31 is outside. It is determined whether the light emitter 14 side or the inner light emitter 13 side (S37). In this case, since the LED 14b of the outer light emitter 14 is turned on, the LED 13b of the inner light emitter 13 is turned off (S38). If the LED 13b of the inner light emitter 13 is turned on in S31, the LED 14b of the outer light emitter 14 is turned off (S39). This series of operations is repeated according to the tilting operation of the heated object.

  Further, when the LED 14b of the outer light emitter 14 is turned on in S31, if the ratio of the input current and the coil current is higher than the threshold value, it is determined that the heated body has come off from the outer diameter ring line 4, for example, The LED 14b of the outer light emitter 14 is blinked (S40), and the ring display window 4a on the outer diameter ring line 4 side is blinked. When the LED 13b of the inner light emitter 13 is lit in S31, the LED 13b of the inner light emitter 13 is blinked (S40), and the ring display window 3a on the inner diameter ring line 3 side is blinked.

  Depending on whether the object to be heated is placed on the top plate 2 or separated, it is not only turned off / on, but also depending on the magnitude of the detected coil current (that is, the coil current assumed at the time of heating) It is also possible to control the amount of light to be increased in multiple steps or continuously in proportion to how much larger current flows than. It is further preferable that the assumed current at this time is appropriately corrected according to the current input to the inverter circuit 21 and the detected material of the pan (there is a relationship stored in advance in the memory of the control device).

  As described above, according to the third embodiment, the inner light emitter 13 is provided between the outer periphery of the inner coil 6a and the inner periphery of the outer coil 6b. It is possible to appropriately display better information according to the position and state of the object to be heated rather than a small amount of information.

  Further, based on predetermined information obtained when the heating coil 6 is energized, when only the ring display window 4a on the outer diameter ring line 4 side is emitting light, when the heated object is separated from the top plate 2, In addition to the light emission of the ring display window 4a on the outer diameter ring line 4 side, the ring display window 3a on the inner diameter ring line 3 side also emits light, and when the heated object is placed on the top plate 2 again, the outer diameter ring Only the ring display window 4a on the line 4 side is caused to emit light, and only the ring display window 4a on the outer diameter ring line 4 side is caused to emit light, it is determined that the heated object has detached from the outer diameter ring line 4 In this case, since the ring display window 4a on the outer diameter ring line 4 side is blinked, the user can be notified of the state of the object to be heated, and it is clear that induction heating is in progress. Can be recognized.

  Further, since the widths of the light guide path 14a of the outer light emitter 14 and the ring display window 4a on the outer diameter ring line 4 side are thicker than those on the inner light emitter 13 side, the ring display window 4a on the outer diameter ring line 4 side is covered. Even if such a heated body is placed, the amount of light leaking outward from the bottom of the heated body increases, so that it is easy to confirm the placement position of the heated body.

  In addition, the inner light emitter 13 positioned between the inner coil 6a and the outer coil 6b is disposed at a position lower than the upper end of the outer light emitter 14, and is housed in a cooling air introduction path 12e formed in the coil base 12 so that the cooling air Therefore, the temperature rise due to the heat generated from the heating coil 6 can be suppressed. Furthermore, since the three buoyancy suppression plates 15 disposed between the top plate 2 and the heating coil 6 are provided with three openings 15d formed in the circumferential direction, the air permeability between the coil base 12 and the coil base 12 is improved. The inner light emitter 13 can be protected from high temperatures.

In the third embodiment, when only the ring display window 4 a on the outer diameter ring line 4 side is caused to emit light, the object to be heated is detached from the outer diameter ring line 4 or separated from the top plate 2. Although the operation has been described, when only the ring display window 3a on the inner diameter ring line 3 side emits light and the heated object is separated from the top plate 2, the light is emitted from the ring display window 3a on the inner diameter ring line 3 side. In addition, the ring display window 4a on the outer diameter ring line 4 side is caused to emit light, and when the heated object is detached from the inner diameter ring line 3, the ring display window 3a on the inner diameter ring line 3 side is caused to blink. Needless to say.
Moreover, regarding the control to change the display when the heated object is separated from the top plate 2, it is not essential to provide both the inner light emitter 13 and the outer emitter 14, and display is performed using only one of them. You may make it perform.

  In addition, when the object to be heated is detached from the outer diameter ring line 4 or separated from the top plate 2, the ring display window 3a on the inner diameter ring line 3 side and the ring display window 4a on the outer diameter ring line 4 side are turned on. However, when this happens, both the ring display windows 3a and 4a may be blinked to notify the user.

As described above, each of the first to third embodiments described above is merely one embodiment of the present invention, and other configurations and controls can be adopted / modified as appropriate without departing from the gist of the present invention. Such embodiments are not excluded from the present invention.
For example, in the above-described embodiment, the substantially ring-shaped light emitter is configured by a combination of two LEDs and a light guide, but may be configured by a combination of one LED and a light guide, A combination of a plurality of LEDs and a plurality of light guide paths may be employed. Moreover, the substantially ring-shaped light emitter does not need to be connected in a linear shape. For example, a plurality of LEDs may be arranged in a substantially annular shape and may be configured by a discontinuous light source that is not connected in a linear shape. .
In addition, the induction heating coil need not be divided into two parts, and three or more parts can be adopted. At that time, a light emitter may be arranged in the gap between the coils, and the light emitter may be a triple or more ring.

  The inner light emitter can be turned off when a large-diameter heated body is placed directly on the inner light-emitting body, but on the other hand, when the heated body is placed on Even in such a case, since it is possible to diffuse the light around and make the top plate or the pan shine, it is possible to turn on the light with the aim of this light diffusion effect.

  As a method and an element for detecting the size, shape, state, material, position, and the like of the heated object, other methods and elements that are not limited to those described above can be used. For example, in order to detect the size, shape, position, etc., one or more optical sensors are arranged in the radial direction of the coil, or distance sensors (infrared sensors, ultrasonic sensors, etc.) are arranged, and the intensity of reaction of each sensor It is also possible to determine the size, distance, etc. by determining the reaction time of the signal. In addition, a method for determining the size, position, or material of the object to be heated based on the current flowing through the heating coil, as described in JP-A-2007-294439, JP-A-2001-126854, It is also possible to adopt a method.

It is an external appearance perspective view of the induction heating cooking appliance which shows Embodiment 1 of this invention. It is a top view which crushes and shows partially the top plate of the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is sectional drawing which shows the positional relationship of the induction coil of the induction heating cooking appliance which concerns on Embodiment 1, and a light-emitting body. It is a top view which shows the coil base of the induction heating cooking appliance which concerns on Embodiment 1. FIG. It is a top view which shows the buoyancy suppression board of the induction heating cooking appliance which concerns on Embodiment 1. FIG. FIG. 3 is a schematic block diagram for explaining an operation of the first embodiment. It is a top view which shows an example of the ring display window lighted according to the magnitude | size of a pan. It is a flowchart which shows the operation | movement at the time of the magnitude | size determination of a pan. 10 is a flowchart showing the operation of the second embodiment. FIG. 10 is a plan view showing a lighting example of a ring display window for explaining the third embodiment. 10 is a flowchart showing the operation of the third embodiment.

Explanation of symbols

1 cooker body, 2 top plate, 3 inner diameter ring line, 4 outer diameter ring line, 5 ring line, 6 heating coil, 6a inner coil, 6b outer coil, 7 grill section,
8, 9 Cooking function display window, 10 Upper surface operation unit, 11 Front operation unit, 12 Coil base, 13 Inner light emitter, 14 Outer light emitter, 15 Buoyancy suppression plate, 16 Cooling air ejection unit, 20 Control unit, 21 Inverter circuit 22 AC-DC conversion circuit.

Claims (10)

Installed on the upper part of the cooker body, and a top plate for placing the object to be heated;
A heating coil disposed below the top plate and formed of an inner coil and an outer coil having different diameters having substantially the same central axis;
The heating coil is arranged so as to be positioned between the outer periphery of the outer coil and the outer periphery of the inner coil and the inner periphery of the outer coil when viewed from the top plate side, and irradiates light toward the top plate. A substantially ring-shaped light emitter,
A substantially ring shape that is formed from side plates facing each other with a gap on both sides of the light emitter disposed between the inner coil and the outer coil, and introduces a part of the cooling air blown to the heating coil for cooling. Cooling air introduction path of
An induction heating cooker comprising: a control unit that detects the size of the object to be heated, and selects a light emitter based on the detection result from the plurality of light emitters to emit light.   The induction heating cooker according to claim 1, wherein a light emitter on the outer coil side of the heating coil is formed wider than a light emitter on the side between the inner coil and the outer coil. Installed on the upper part of the cooker body, and a top plate for placing the object to be heated;
A heating coil disposed below the top plate and formed of an inner coil and an outer coil having different diameters having substantially the same central axis;
The heating coil is arranged so as to be positioned between the outer periphery of the outer coil and the outer periphery of the inner coil and the inner periphery of the outer coil when viewed from the top plate side, and irradiates light toward the top plate. A substantially ring-shaped light emitter,
A substantially ring shape that is formed from side plates facing each other with a gap on both sides of the light emitter disposed between the inner coil and the outer coil, and introduces a part of the cooling air blown to the heating coil for cooling. Cooling air introduction path of
When energizing the heating coil, it detects whether or not the object to be heated placed on the top plate is an object to be heated that is suitable for induction heating. Or the induction heating cooking appliance provided with the control means to light-emit so that any one light-emitting body may differ from the light emission state when appropriateness is detected.   The said control means changes the light emission state of these light-emitting bodies or any one light-emitting body according to the cause, when it judges that it is a to-be-heated body unsuitable for induction heating. Induction heating cooker.   The said control means changes the light emission state of these light-emitting bodies or any one of these light-emitting bodies, when it is judged that the cause unsuitable for induction heating is a small article below a prescribed size. Induction heating cooker.   The said control means changes the light emission state of these light-emitting bodies or any one light-emitting body, when it is judged that the cause unsuitable for induction heating originates in a material. Induction heating cooker. Installed on the upper part of the cooker body, and a top plate for placing the object to be heated;
A heating coil disposed below the top plate and formed of an inner coil and an outer coil having different diameters having substantially the same central axis;
Wherein is a heating coil, respectively arranged so as to be located between the inner periphery of the outer peripheral and an outer coil of the outer periphery of the outer coil as viewed from the top plate side, and the inner coil, you irradiated with light to the ceiling plate a substantially ring-shaped light emitters number of double,
A substantially ring shape that is formed from side plates facing each other with a gap on both sides of the light emitter disposed between the inner coil and the outer coil, and introduces a part of the cooling air blown to the heating coil for cooling. Cooling air introduction path of
And a control means for detecting whether or not the object to be heated is displaced or whether or not the object to be heated is separated from the top plate and changing the light emission state of the plurality of light emitters according to the detection result. Induction heating cooker.   When the controller determines that the object to be heated has moved away from the top plate, in addition to the light emitter that emits light when the object to be heated is placed on the top plate, The induction heating cooker according to claim 7, wherein the induction heating cooker is made to emit light.   The induction heating cooker according to any one of claims 1 to 8, wherein the light emitter on the side between the inner coil and the outer coil is disposed below the upper end of the light emitter on the outer coil side. Is disposed between the heating coil and the top plate, any of claims 1 to 9, further comprising a buoyancy control plate to the light emitter and the surface facing between the inner coil and the outer coil side with an opening The induction heating cooker of crab.

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