JP3620500B2 - Induction heating cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heating cooker using a light emitter.
[0002]
[Prior art]
Conventionally, there is an induction heating cooker of this type as shown in FIG. FIG. 6A is a conceptual diagram of an induction heating cooker using a conventional light emitter, and FIG. 6B is a top view of the light guide 7. In the figure, a cooking pan (not shown) is placed on the heating part 3 of the top plate 2 disposed on the upper surface of the main body 1. In order to heat the cooking pan, an induction heating coil 4 is provided on the heating coil support 5 at a position corresponding to the heating portion 2 of the top plate 1, that is, the cooking pan. A light guide 7 is provided on the heating coil support 5 below the top plate 2, and the size of the light guide 7 is set so as to surround the outer periphery of the induction heating coil 4. 7 can reach the top plate 2 without being disturbed by the heating coil 4, and the range of the heating unit 3 can be clarified on the top plate 2. Light emitted from the light source body 8 propagates through the light guide body 7 and emits light from the surface thereof. In FIG. 6, the light guide 7 having a rectangular cross section is formed into a ring shape, and one light source 8 is disposed at each end thereof.
[0003]
The light guide with such a shape guides light and causes the bottom and side surfaces to be mirror surfaces in order to emit light from the top surface, and totally reflects the light inside, but the light leaks from those surfaces and the light emitting part becomes darkly blurred, etc. There was an inconvenience.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned conventional problems, and to provide an induction cooking device having an inexpensive structure, increasing the amount of light emitted from a light guide showing a heating unit, and improving its visibility. It is what.
[0005]
[Means for Solving the Problems]
In order to solve the conventional problems, the induction heating cooker of the present invention has a configuration in which the light guide is brought into contact with the magnetic shield member and the light leaked from the inside of the light guide is reflected by the magnetic shield member. By using the magnetic shield member, the amount of light emitted from the light emitting surface of the light guide is increased to improve visibility, and the light emitting member and the magnetic shield member are brought into contact with each other to reduce their occupied volume for mounting. The density can be increased.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 is a heating coil, a magnetic shield member provided around the heating coil for canceling the magnetic flux generated by the heating coil, a light emitter for generating light, and the heating coil. A translucent top plate disposed; and a light guide that guides light from the light emitter. The light guide contacts the magnetic shield member and leaks light leaked from the light guide inside. By being reflected by the magnetic shield member, the light leaking from the light guide at the portion in contact with the magnetic shield member is reflected so that the shape of light emitted from the light guide can be clearly seen. Moreover, the mounting density of both can be made high by making it contact and follow a magnetic shield member.
[0007]
According to a second aspect of the present invention, in the configuration of the first aspect, in particular, the magnetic shield member is provided with a groove substantially parallel to the circumferential direction of the heating coil opened upward, and a light guide is formed in the groove of the magnetic shield member. Since the light guide is in contact with the inner surface of the groove, the amount of light that leaks from the light guide is reflected on the inner surface of the groove, so that the amount of light emitted from the light emitting portion of the light guide is further increased. Since it can be brightened by increasing the number, the shape of the light emission becomes easier to see.
[0008]
According to a third aspect of the present invention, in the configuration of the second aspect, in particular, the groove opened upward includes a plurality of slit grooves in a direction intersecting with a groove substantially parallel to the circumferential direction of the heating coil, By scattering light emitted from the light guide also from the plurality of slit grooves, various light emission shapes can be formed by the plurality of slit grooves without increasing the light guide.
[0009]
According to a fourth aspect of the present invention, in the configuration of the second or third aspect, in particular, a plurality of notch grooves communicating with the grooves provided substantially parallel to the circumferential direction of the magnetic shield member are provided, Since the cooling air from the fan that cools the component is guided to the circumferential groove, it is possible to prevent the temperature of the light guide provided in the groove from rising.
[0010]
【Example】
(Example 1)
A first embodiment of the present invention will be described with reference to FIG. 1A is a cross-sectional view of the induction heating cooker according to the first embodiment, FIG. 1B is a top view of the light guide, and FIG. As shown in the figure, a heating coil support 13 is placed on a support column 12 provided on the bottom surface of the main body 11, and is fixed by screws 14. A heating coil 15 is placed on the heating coil support 13, and a ceramic top plate 16 is disposed above the heating coil 15. The peripheral portion of the heating coil 15 is pressed against and fixed to the heating coil holding base 13 by a coil holder 17, and a high frequency current is supplied from a frequency conversion device 18 such as an inverter disposed in the main body 11.
[0011]
A mounting groove 19 is provided on the outer surface of the heating coil holding base 13, and a metal having good heat conduction (aluminum in this embodiment) having a large number of irregularities 21 on the surface formed in a loop shape in the groove 19 is provided. A magnetic shield member 20 formed by die casting is inserted and fixed. Further, a light guide 26 that emits ring-shaped resinous light in contact with the outer peripheral side surface of the magnetic shield member 20 is provided on the heating coil support 13 together with the light emitter 27.
[0012]
A fan 22 is provided in the main body 11, and the air whose temperature has risen by sucking outside air having a low temperature and cooling the components inside the main body 11 is discharged out of the main body 11.
[0013]
In the above configuration, when a high frequency current is supplied from the frequency converter 18 to the heating coil 15, a magnetic field is generated from the heating coil 15. This magnetic field is linked to, for example, an iron pan placed on the top plate 16 to generate an eddy current in the pan, and the pan generates heat due to Joule heat.
[0014]
The magnetic field generated from the heating coil 15 can generate an induction current in the magnetic shield member 20 and suppress the magnetic field generated from the heating coil 15 and leaking to the surroundings. The magnetic shield member 20 generates heat due to an induced current flowing therethrough. The magnetic shield member 20 is made of a metal material having a large number of uneven portions 21 on the surface and good heat conduction. When the cooling air is received from the fan 22, the cooling effect of the shield member 20 is increased.
[0015]
In addition, since the light guide 26 that emits ring-shaped resin light in contact with the outer peripheral side surface of the magnetic shield member 20 is provided on the heating coil support 13 together with the light emitter 27, the light guide 26. And the magnetic shield member 20 can be mounted with high density.
[0016]
Further, as shown in FIG. 1B, the light guide 26 has a substantially circular planar shape and is disposed so as to be in contact with the outer periphery of the shield member 20, and has a substantially rectangular cross section. It has a shape with a part cut away. The light emitted from the light emitter 27 is irradiated to the end face of the notch. The light guide 26 is also formed with a mirror-like surface on both side surfaces and a bottom surface so that the light guided to the inside is totally reflected and the upper surface is roughened so that the light is diffused on the upper surface. Therefore, the light emitted from the light emitter 27 enters the light guide 26 from the end of the light guide 26, and the upper portion of the light guide shines linearly (circularly).
[0017]
Furthermore, as shown in the figure (b ′), the light guide 27 has a configuration in which a part of the substantially circular shape is crossed and the light emitted from the light emitter 27 is irradiated to the end portion. The light emitted from the light emitter 27 enters the light guide 26 from the end portion of the light guide 26, and shines in a substantially circular shape in which the upper portion of the light guide is linear and has no light missing portion.
[0018]
Moreover, since the inner peripheral side surface of the light guide 26 is in contact with the magnetic shield member 20, the light leaking from the light guide is reflected at the portion in contact with the magnetic shield member and diffused at the upper portion of the light guide. The amount of light emitted can be increased, and the shape of light emitted from the light guide can be seen more clearly.
[0019]
In the present embodiment, the material of the magnetic shield member 20 is aluminum, but other high conductivity metals may be used. If the material itself is silver or grey, such as aluminum, or if it is plated, or if it is painted to make it easy to reflect, the light emission from the top surface will increase, or It can be displayed more clearly.
[0020]
(Example 2)
2A is a cross-sectional view of the induction heating cooker according to the second embodiment, FIG. 2B is a top view of the light guide, and FIG. 2C is a cross-sectional view of the main part thereof. The relationship is shown. Moreover, since the whole structure is the same as Example 1 already demonstrated, description is abbreviate | omitted. The same constituent members are given the same reference numerals. The difference from the first embodiment is that the light guide 26 is provided in contact with the inner peripheral surface of the magnetic shield member 20. The operation and effect are the same as those in the first embodiment.
[0021]
In addition, as shown in (b ′), if a part of the light guide is crossed to shield the outside of the circle-returned portion, the circle-returned shape can be displayed by light emission.
[0022]
(Example 3)
FIG. 3A is an exploded perspective view of the main part showing the relationship between the magnetic shield member and the light guide part of the induction heating cooker of the third embodiment, and FIG. 3B is a sectional view of the main part. Since the entire configuration is the same as that of the first embodiment already described, description thereof is omitted. The same constituent members are given the same reference numerals. The difference from the first embodiment is that the magnetic shield member 20 is opened upward, a loop-shaped groove 21 is provided in the circumferential direction of the heating coil 15, and a ring-shaped light guide 26 and a light emitter 27 are inserted into the groove 21. It is.
[0023]
With the above configuration, since the resin light guide 26 is attached in the magnetic shield member 20 in which the temperature rise is suppressed as described in the first embodiment, the assembly is easy. Furthermore, since the loop-shaped groove 21 is provided, the cooling effect of the shield member 20 is also improved.
[0024]
Further, since the light guide 26 is inserted into the concave portion of the shield member 20, light leaking from the light guide 26 is reflected on both side surfaces and the lower surface side, so that the amount of light diffused from the upper surface is further reduced. The image becomes brighter and brighter.
[0025]
In addition, as shown in FIG. 3A ', if a part of the light guide 27 is crossed and unnecessary portions are shielded from light, a circle-returned shape without a notch can be displayed.
[0026]
(Example 4)
FIG. 4A is an exploded perspective view of a main part of the induction heating cooker according to the fourth embodiment, and FIG. 4B is a cross-sectional view of the main part. A large number of slit grooves 24 are provided in the magnetic shield member 20. A difference from the third embodiment is that the magnetic shield member 20 is provided with a large number of slit grooves 24 in the radial direction.
[0027]
With the above configuration, the light emitted from the light guide 26 passes through the slit groove 24 and is scattered radially. Therefore, when it sees from the upper surface of the top plate 16, it can discriminate | determine well that the induction heating cooking appliance is operating.
[0028]
(Example 5)
5A is an exploded perspective view of the main part of the induction heating cooker according to the fourth embodiment, and FIG. 5B is a cross-sectional view of the main part. By providing the magnetic shield member 20 with a notch groove 25 that is larger than the slit groove 24, the cooling air can further pass through and the temperature rise of the light guide section 26 can be prevented.
[0029]
In the above embodiment, the aluminum magnetic shield member has been described, but the same effect can be obtained even if a material having high conductivity such as aluminum alloy, copper, or copper alloy is used as the material of the magnetic shield member. is there.
[0030]
【The invention's effect】
As described above, according to the present invention, a continuous light emission shape can be displayed brightly and clearly around the heating coil using the magnetic shield member that reduces the leakage magnetic field, and the magnetic shield member and the light emitting member are mounted. An induction heating cooker having a high density can be provided.
[Brief description of the drawings]
1A is a cross-sectional view of an induction heating cooker in Embodiment 1 of the present invention, FIG. 1B is a top view of the light guide, and FIG. 1B is a plan view showing another shape example of the light guide. FIG. 2 (a) Cross-sectional view of induction heating cooker in Embodiment 2 of the present invention (b) Top view of the light guide (b ′) Other shape examples of the light guide FIG. 3C is a sectional view of the main part of the same. FIG. 3A is an exploded perspective view of the main part of the induction heating cooker according to the third embodiment of the present invention. FIG. FIG. 4B is a sectional view of the main part of the induction heating cooker according to the fourth embodiment of the present invention. FIG. 5A is a sectional view of the main part. FIG. 6B is a cross-sectional view of the main part of the induction heating cooker according to the fifth embodiment of the present invention. FIG. 6A is a cross-sectional view of the induction heating cooker of the conventional example. Plan view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Main body 13 Heating coil support stand 15 Heating coil 16 Top plate 18 Electric circuit device 20 Magnetic shield member 21 Uneven part 22 Fan 23 Closed loop groove 24 Slit groove 25 Notch groove 26 Light guide

Claims (4)

A heating coil, a magnetic shield member provided around the heating coil for canceling out the magnetic flux generated by the heating coil, a light emitting body for generating light, and a translucent top plate disposed above the heating coil And a light guide that guides the light of the light emitter, the light guide being in contact with the magnetic shield member and reflecting the light leaking from the light guide inside by the magnetic shield member Cooker. The induction heating cooker according to claim 1, wherein the magnetic shield member is provided with a groove substantially parallel to the circumferential direction of the heating coil opened upward, and a light guide is provided in the groove of the magnetic shield member. The groove opened upward includes a plurality of slit grooves in a direction intersecting with a groove substantially parallel to the circumferential direction of the heating coil, and scatters light emitted from the light guide also from the plurality of slit grooves. Induction heating cooker. 4. A plurality of cutout grooves communicating with grooves provided substantially parallel to the circumferential direction of the magnetic shield member are provided, and cooling air from a fan that cools components in the main body is guided to the circumferential grooves. Induction heating cooker.

Images