JP3909518B2 - Induction heating cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heating cooker, and more particularly to an induction heating cooker that displays a heating state by luminance of a light emitting means.
[0002]
[Prior art]
FIG. 9 is a cross-sectional view of a conventional electric stove. In the figure, 21 is a main body of an electric stove, 22 is a heater which is a heating means disposed in the main body 21, 23 is a heat insulating material provided so as to surround the lower part and the side part of the heater 22 in the main body 21, An insulating material 24 is provided between the heater 22 and the inner bottom surface of the heat insulating material 23. Reference numeral 25 denotes a light emitting means such as a light bulb or a semiconductor element that emits a light beam disposed so as to surround the heater 22 outside the side wall of the heat insulating material 23, and is reflected on the inner surface and the inner bottom surface of the main body 21 corresponding to the light emitting means 25. A plate 26 is provided, and a transmission part 27 made of, for example, glass, through which light from the light emitting means 25 and reflected light from the reflection plate 26 are transmitted is provided on the side wall of the heat insulating material 23. 28 is a top plate made of translucent heat-resistant glass or the like provided so as to cover the upper part of the main body 21, and the cooking unit 29 is placed on the cooking unit 28 a immediately above the heater 22 is a cooking unit 28 a. Thus, the cooking container 29 is heated.
[0003]
In the electric stove configured in this manner, when a cooking container 29 containing an object to be heated is placed on the top plate 28 and the main body 21 is turned on, an alternating current flows through the heater 22 to heat the cooking container 29. . At the same time, the light emitting means 25 also emits light, and the strength of the heater 22 can be recognized by a change in luminance of the light emitting means 25 corresponding to the heating power level of the heater 22.
[0004]
[Problems to be solved by the invention]
In the conventional electric stove as described above, the light emitting means 25 is provided on the outer periphery of the heater 22 so that the heating power level of the heater 22 can be recognized by the luminance change of the light emitting means 25. Even when concentrated on the container 29, the light emitting means 25 enters the visual field, and the strength of the heater 22 can be confirmed by the simulated flame of the light emitting means 25. However, the brightness with respect to a certain fire power level is not changed, and there is a problem that the light beam irradiated to the cooking container 29 is different from an actual flame image. In addition, in the cooking container 29 having a low height such as a frying pan, the light from the light emitting means 25 and the reflected light from the reflecting plate 26 do not irradiate the side surface of the cooking container 29 from the transmitting portion 27 or the top plate 28. There was also a problem that 25 luminance changes could not be recognized.
[0005]
The present invention has been made to solve the above-described problems, and is an easy-to-use induction heating that can display the heating state as if it were a gas cooker, regardless of the shape or size of the cooking container. The purpose is to provide a cooker.
[0006]
[Means for Solving the Problems]
The induction heating cooker according to the present invention includes a translucent top plate, induction heating means for induction heating a cooking vessel placed on the top plate, and a direction for irradiating the cooking vessel with light through the top plate. And a plurality of light emitting means having a light emitting property and a light emitting means control means for controlling the brightness blinking cycle of each light emitting means to be asynchronous with each other during induction heating of the cooking container. Located on the front side of the cooking container placed on the plate and at the left and right of the same distance with the center of the induction heating means as the center, and the angle of the light emitting means with respect to the horizontal plane parallel to the top plate is a predetermined angle The light emitting means is provided so that
[0007]
The induction heating cooker according to the present invention has a predetermined angle of 33 degrees or less .
[0008]
The induction heating cooker according to the present invention is such that the blinking cycle of each light emitting means becomes smaller as the heating power level becomes stronger .
[0009]
In the induction heating cooker according to the present invention, the top plate has a translucent part through which the light of the light emitting means is transmitted at a part of the top plate .
[0010]
In the induction heating cooker according to the present invention, the translucent part is a diffusion lens that diffuses the light from the light emitting means .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a perspective view of Embodiment 1 of the present invention, and FIG. 2 is a control block diagram of FIG. In the figure, 1 is a main body of the induction heating cooker, 2 is a heating coil which is induction heating means provided in the main body 1, and is installed at a plurality of locations. In the first embodiment, two places are installed below the large circle on the top plate of the main body 1 to be described later, and heaters are installed below the small circle on the top plate. Reference numeral 3 denotes a light emitting means composed of a plurality of (in this case, two) light bulbs or semiconductor elements that emit light, and is provided in the vicinity of each heating coil 2 on the front side (the side where the cook stands) in the main body 1. . In addition, each light emission means 3 of this Embodiment 1 has the directivity which irradiates in a certain direction (for example, side direction of the cooking container mentioned later).
[0014]
4 is a top plate made of heat-resistant glass or the like covering the upper surface of the main body 1, and the heating coil 2 (including the heater) is directly above the cooking unit 4a, and the cooking container 5 is placed on the cooking unit 4a. Thus, the cooking container 5 is induction-heated or heated. Moreover, the top plate 4 is provided with a translucent portion 6 through which light from the light emitting means 3 irradiated on the side surface of the cooking vessel 5 is transmitted, and is provided at a position corresponding to the irradiation angle of the light emitting means 3. And it is formed in the magnitude | size which the light ray of the light emission means 3 is not interrupted | blocked. In addition, you may make it abbreviate | omit the translucent part 3 and to comprise the top plate 4 with the material which has translucency.
[0015]
7 is an AC power source for supplying AC current to the main body 1, 8 is an inverter power source provided in the main body 1 and generated by the AC power source 7, 9 is a load circuit formed including the cooking vessel 5 and the heating coil 2, 10 Is an inverter circuit that supplies a high frequency current to the load circuit 9 by being supplied with the inverter power supply 8, 11 is an inverter control circuit that controls the operation of the inverter circuit 10, 12 is a control power supply generated by the AC power supply 7, and 13 is This is a light emission means control circuit for controlling the light emission state of each light emission means 3, that is, the brightness blinking (ON / OFF) cycle of each light emission means 3 to be asynchronous with each other.
[0016]
The operation of the first embodiment configured as described above will be described with reference to the flowchart of FIG. First, when the cooker turns on a power switch (not shown) provided in the main body 1 of the induction heating cooker (S1 in FIG. 3), an AC current is supplied from the AC power source 7 to the main body 1, and the inverter power source 8 Then, the control power source 12 is activated (S2, S3), and the cooking container 5 is placed on the cooking portion 4a on the induction heating side of the top 4 or an appropriate cooking container 5 (material or size suitable for induction heating). The inverter control circuit 11 controls the drive of the inverter circuit 10 based on the information on whether the cooking container 5) is placed (S4, S5, S9).
[0017]
That is, when the information by the load circuit 9 is the information that the proper cooking vessel 5 is placed (S4), the inverter control circuit 11 drives the inverter circuit 10 and the cooking vessel 5 through the heating coil 2. Induction heating is started (S5). When the information by the load circuit 9 is information that the cooking container 5 is not placed or that the proper cooking container 5 is not placed (S4), the inverter control circuit 11 drives the inverter circuit 10. And induction heating of the cooking vessel 5 by the heating coil 2 is not started (S9).
[0018]
When the control power supply 12 is activated (S3), the light emission means control circuit 13 is simultaneously driven (S6), and the light emission means control circuit 13 controls each light emission means 3 based on the drive information of the inverter circuit 10 (S7, S8, S10). That is, when the inverter circuit 10 is driven (S7), each light emitting means 3 is also driven to irradiate the side surface of the cooking container 5 through the light transmitting part 6 (S8). At this time, the light emitting means 3 are controlled by the light emitting means control circuit 13 so that their luminance blinking cycles are asynchronous with each other. As a result, the light beams of the respective light emitting means 3 are separately irradiated to cause light interference, and the respective luminances of the respective light emitting means 3 are set to, for example, the luminance 1 and the luminance 2, and the blinking periods of the respective luminances are, for example, a combination of prime numbers. Then, the sum of the two, that is, the luminance sum (luminance 1 + luminance 2) becomes irregular with respect to time as shown in FIG. 4 or 5, and a display simulating flame-like fluctuation is displayed on the side surface of the cooking vessel 5. can get. In this case, the flashing cycle of the luminance of each light emitting means 3 is constant at all the set thermal power levels. However, as shown in FIG. 6, the flashing cycle of the luminance may be changed according to the set thermal power level.
[0019]
On the other hand, when the drive of the inverter circuit 10 is stopped (S7), the drive of each light emitting means 3 is also stopped and no light irradiation is performed (S10).
[0020]
As described above, when the appropriate cooking container 5 is placed and the light emitting means 3 irradiates the side surface of the cooking container 5 (particularly the side on which the cook stands) with the light emitting means control circuit 13, a plurality of light emitting means 3. Are controlled so as to be asynchronous with each other, so that the light beams of the respective light emitting means 3 are irradiated separately to cause interference of light, and the luminance sum of each light emitting means 3 is irregular with respect to time. It changes and the display which simulated the fluctuation like a flame on the side surface of the cooking container 5 can be performed. Thereby, even when a cook leaves | separates from an induction heating cooking appliance, it becomes easy to grasp | ascertain a heating state visually, and can obtain the user-friendly induction heating cooking appliance.
[0021]
Moreover, since the display simulating the fluctuation like the flame by the light irradiated to the side surface of the cooking vessel 5 is a heating display close to the flame of the gas cooker, it is easy to sensibly determine the heating state. A cooking device can be obtained.
[0022]
In the first embodiment described above, the case where two light emitting means 3 are provided is shown, but the same effect can be obtained when three or more light emitting means 3 are provided.
Moreover, although the case where the translucent part 6 was provided corresponding to the light emission means 3 in the top plate 4 was shown, you may comprise the top plate 4 whole so that it may have translucency, and the translucent part 6 is made. A diffusing lens may be used. In this case, the light from the light emitting means 3 is diffused and applied to a wide area on the side surface of the cooking container 5, so that a simulated display can be performed not only on the side where the cook stands but also in a wide area.
Further, reflectors may be provided around the light emitting means 3, particularly on the side surface and the inner bottom surface corresponding to the light emitting means 3 of the main body 1, so that the light beam does not leak to the heating coil 2 side or other parts in the main body 1. . In this case, since more light rays are irradiated to the cooking container 5 from the translucent part 6, a heating state can be grasped | ascertained more reliably visually.
[0023]
Embodiment 2. FIG.
FIG. 7 is a perspective view of an essential part of Embodiment 2 of the present invention, and FIG. 8 is a sectional view of the essential part. This embodiment 2 is the induction heating cooker according to the embodiment 1, wherein the pair of light emitting means 3 is located on the front side in the main body 1 on the left and right of the same distance with the center portion of the heating coil 2 as the center. The irradiation angle θ with respect to the cooking container 5 is provided so as to be within a predetermined angle, for example, 33 degrees with respect to the horizontal surface 15 from the light emitting means 3 parallel to the top plate 4. The translucent portion 6 is provided at a position corresponding to the irradiation angle θ of the light emitting means 3 of the top plate 4 and is sized so as not to block the light beam from the light emitting means 3. On the front side of the unit 4a (the side on which the cook stands), a thermal power display unit 14 that displays the thermal power set by the cook stepwise is provided.
[0024]
Here, the reason why the irradiation angle θ of the light emitting means 3 is set within 33 degrees will be described with reference to FIG.
The distance L1 from the center of the heating coil 2 to the light emitting means 3 is 160 mm in the case of a normal induction heating cooker (a three-port type built-in type, a two-port type stationary type). Therefore, when the cooking container 5 having a small diameter of 120 mm is placed on the cooking unit 4a of the top plate 4 that is directly above the heating coil 2, the distance L2 between the side surface of the cooking container 5 and the light emitting means 3 is L1-60 = 100 mm. . On the other hand, the distance L3 from the light emitting means 3 disposed below the top plate 4 to the top surface of the top plate 4 is 14 mm (the thickness of the top plate 4 is 4 mm + the distance between the bottom surface of the top plate 4 and the light emitting means 3 is 10 mm). Here, when the cooking container 5 has a shape such as a frying pan, its height L4 is as low as about 50 mm. Therefore, the distance L5 from the highest part of the side surface of the cooking container 5 to the light emitting means 3 is L5 = L3 + L4 = 64 mm. Become.
From the above, the irradiation angle θ with respect to the horizontal plane 15 from the light emitting means 3 parallel to the top plate 4 necessary for the light rays from the light emitting means 3 to reach the highest part of the side surface of the cooking container 5 having the height of L4 is ,
tan θ = L5 / L2
θ = tan ⁻¹ (L5 / L2) ≈33 °
It becomes.
Therefore, the irradiation angle θ with respect to the horizontal plane 15 from the light emitting means 3 parallel to the top plate 4 of the light emitting means 3 is within 33 degrees.
[0025]
With this configuration, substantially the same operation and effect as in the first embodiment can be obtained, and the light emitting means 3 is positioned on the front side in the main body 1 on the left and right sides of the same distance with the center of the heating coil 2 as the center. Since it did in this way, since the light beam of the light emission means 3 does not enter into a cook's visual field directly, the trouble of cooking by a light beam can be prevented. Further, since the irradiation angle θ of the light emitting means 3 is set to a predetermined angle (within 33 degrees) with respect to the horizontal plane 15 from the light emitting means 3 parallel to the top plate 4, for example, the small diameter φ is 120 mm on the cooking portion 4a of the top plate 4. Even when the cooking container 5 such as a low frying pan is placed, it is possible to irradiate the side of the cooking container 5 with the light beam of the light emitting means 3, regardless of the shape or size of the cooking container. It is possible to obtain an easy-to-use induction heating cooker that can display the heating state as if it were a gas cooker.
[0026]
【The invention's effect】
As described above, the induction heating cooker according to the present invention includes a translucent top plate, induction heating means for induction heating a cooking vessel placed on the top plate, and light rays through the top plate to the cooking vessel. A plurality of light emitting means having directivity to irradiate the light source, and a light emitting means control means for controlling the brightness flickering cycle of each light emitting means to be asynchronous with each other during induction heating of the cooking container. It is located on the front side of the cooking container placed on the lower top plate and on the left and right of the same distance from the center of the induction heating means, and further with the irradiation direction of the light emitting means with respect to the horizontal plane parallel to the top plate Since the light emitting means is provided so that the angle becomes a predetermined angle, the light beams of each light emitting means are irradiated separately and light interference occurs, and the luminance sum of each light emitting means changes irregularly with respect to time, Simulated flame-like fluctuation on the side of the cooking container To be able to carry out the view, the heating state even if the chef is away from the induction heating cooker visually easily grasped, it is possible to obtain a user-friendly induction heating cooker. In addition, the display that simulates the flame-like fluctuation caused by the light radiated to the side surface of the cooking container becomes a heating display that is close to the flame of the gas cooker, and it is easy to judge the heating state sensuously. Can be obtained.
In addition, it is possible to avoid the light beam of the light emitting means from directly entering the view of the cook, and it is possible to irradiate the light of the light emitting means on the side surface of the cooking container even in a cooking container such as a frying pan having a low height. An easy-to-use induction heating cooker that can display the heating state with a feeling close to that of a gas cooker can be obtained regardless of the shape or size of the cooking container.
[0027]
In the induction heating cooker according to the present invention, since the predetermined angle is within 33 degrees, it is possible to perform display simulating flame-like fluctuations regardless of the shape or size of the cooking container.
[0028]
The induction heating cooker according to the present invention reduces the blinking cycle of each light-emitting means as the thermal power level increases, so that an induction heating cooker that can display a heating closer to the flame of a gas cooker is obtained. It is done.
[0029]
In the induction heating cooker according to the present invention, the top plate has a translucent part through which the light beam of the light emitting means is transmitted at a part of the top plate, so that the light beam of the light emitting means directly enters the view of the cook. An induction heating cooker that can be avoided and is easy to use can be obtained.
[0030]
In the induction heating cooker according to the present invention, since the translucent part is a diffusion lens that diffuses the light from the light emitting means, the light from the light emitting means can be diffused to irradiate a wide area on the side surface of the cooking container. The induction heating cooker which can perform a simulation display not only on the side where the cook stands but also in a wide range is obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a first embodiment of the present invention.
FIG. 2 is a control block diagram of FIG.
FIG. 3 is a flowchart illustrating the operation of the first embodiment of the present invention.
FIG. 4 is a diagram showing a change in luminance of each light emitting unit according to Embodiment 1 of the present invention.
FIG. 5 is a diagram showing a change in luminance of each light emitting unit according to the first embodiment of the present invention.
FIG. 6 is a diagram showing a change in luminance cycle with respect to a set heating power level of the light emitting unit according to Embodiment 1 of the present invention.
FIG. 7 is a perspective view of essential parts of a second embodiment of the present invention.
8 is a cross-sectional view of the main part of FIG.
FIG. 9 is a cross-sectional view of a conventional electric stove.
[Explanation of symbols]
2 heating coil, 3 light emitting means, 4 top plate, 5 cooking container, 6 translucent part, 13 light emitting means control circuit, 15 horizontal plane, θ irradiation angle.

Claims (5)

A top plate having translucency, induction heating means for induction heating a cooking vessel placed on the top plate, and a plurality of light emitting means having directivity for irradiating light to the cooking container via the top plate And a light emission means control means for controlling the blinking cycle of the brightness of each light emission means to be asynchronous with each other during induction heating of the cooking container,
The light emitting means is located on the front side of the cooking container placed on the top plate at the lower part of the top plate and on the left and right at the same distance from the center of the induction heating means, and further parallel to the top plate. An induction heating cooker, characterized in that the light emitting means is provided such that an angle of the light emitting means with respect to a horizontal plane is a predetermined angle .   The induction heating cooker according to claim 1, wherein the predetermined angle is within 33 degrees. The induction heating cooker according to claim 1 or 2, wherein the blinking period of each light emitting means is reduced as the thermal power level is increased . The induction heating cooker according to any one of claims 1 to 3, wherein the top plate has a light-transmitting portion through which a light beam of a light emitting means is transmitted, at a part of the top plate . 5. The induction heating cooker according to claim 4 , wherein the light transmitting part is a diffusion lens that diffuses light from the light emitting means .

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