WO2012137517A1

WO2012137517A1 - Inductive heating cooker

Info

Publication number: WO2012137517A1
Application number: PCT/JP2012/002444
Authority: WO
Inventors: 浩幸勝部; 日下　貴晶; 小川　賢治; 大平小栗; 修平竹村
Original assignee: パナソニック株式会社
Priority date: 2011-04-08
Filing date: 2012-04-06
Publication date: 2012-10-11

Abstract

An inductive heating cooker comprises: a light source (34) which is provided in the vicinity of the periphery of a heating coil (24); a reflective frame (39) which has a sidewall (36) for reflecting light from the light source (34), and ensures that the light is not dispersed to the side; and a coil base (25) which has a reflective frame accommodating section (41) that supports the heating coil (24) from below and has the reflective frame (39) attached thereto. The reflective frame (39) has a vertical aperture and light that is incident from below is emitted upwards while said light is reflected, and it is therefore possible to obtain excellent light emission characteristics for a light-emitting display section even in a narrow space.

Description

Induction heating cooker

The present application is Japanese Patent Application No. 2011-86019 filed on April 8, 2011 in Japan, Japanese Patent Application No. 2011-283194 filed on December 26, 2011, 2011 The Japanese patent application of Japanese Patent Application No. 2011-273145 filed on Dec. 14 is based on the priority, and the contents of these Japanese patent applications are here as part of the present specification. I'll mention it.

The present invention relates to an induction heating cooker for emitting and displaying the position and operating state of a heating coil.

Conventionally, this type of induction heating cooker, unlike gas cookers and electric heaters, does not show flames or red heat when heated, and in recent years, products that appeal visually by displaying the heating state with light emitting diodes etc. have spread. Have been doing.

As an example, when induction heating is started, a light emitting display unit provided in the vicinity of the outer periphery of the heating coil is turned on (see, for example, Patent Document 1).

The light-emitting display part of the conventional induction heating cooker has a structure as shown in FIG. This structure (only the light-emitting display part is shown) has a main body case that forms an outer shell, a top plate formed of a material that transmits light provided on the upper surface of the case, and heating that induction-heats the cooking container at the bottom of the top plate. The light emission display part mounted in the induction heating cooking appliance main body provided with the coil is shown.

The light emitting display portion around the heating coil receives light from the light source 51, a light emitting substrate 52 having a light source 51, a box 53 having an opening that is configured to surround the light emitting substrate 52 and transmits light to the top. A display sheet 56 on which the bright portion 54 and the opaque portion 55 are formed by printing is placed so as to cover the opening at the top of the box 53, and is emitted from the light source 51 from below to above the display sheet 56. The display sheet 56 is caused to emit light and display the position and use state of the heating coil.

JP 2010-257579 A

However, in the conventional configuration, light from a light source such as an LED is emitted directly toward the upper display sheet. Therefore, if the light from an LED with narrow directivity is to reach a wide range, the light source is located far from the display sheet. In order to fix, the space is required, and it is necessary to secure the space or increase the number of LEDs.

In addition, in an induction heating cooker equipped with such a light emitting display means, it is necessary to provide light emitting means as close to the heating part as possible in order to display the state of the heating part in an easy-to-understand manner to the user. It was easily affected by heat from the cooking container on the top plate.

Also, if there is enough space in the main body and sufficient cooling air can be distributed to the display part around the coil, a cooling effect can be obtained, but for example, it becomes mainstream in overseas etc. When trying to mount the light-emitting display around the coil in the same thin IH, there is not enough space and cooling air to be obtained. Had the problem of being necessary.

The present invention solves the above-described conventional problems, and can suppress a temperature rise due to heat from a heating coil or a cooker while ensuring good light emitting characteristics of a light emitting display portion around the coil, and is thin. An object of the present invention is to provide an induction cooking device having a light emitting display portion that can be realized even in such a small space.

In order to solve the above-described conventional problems, the induction heating cooker of the present invention has a light source provided in the vicinity of the outer periphery of the heating coil and a side wall that reflects the light of the light source so that the light does not diffuse sideways. A reflecting frame that has a lower opening that opens downward and an upper opening that opens upward. And it includes a display member that covers the upper opening of the reflection frame and projects the symbol display by transmitting the light emitted from the upper opening through the symbol display, while reflecting the light incident from the lower opening, The light emitted from the upper opening is irradiated upward.

Thereby, since light from a light source such as an LED can be diffused while being reflected by the reflection frame, good light emission characteristics of the light emitting display section can be obtained even in a narrow space.

Also, by providing ventilation holes in the bottom and side walls of the reflection frame, it is possible to release the hot air in the reflection frame to the outside without reducing the light emission characteristics, and to further suppress the temperature rise of the light source.

The induction heating cooker of the present invention can suppress the temperature rise of the light emitting display part due to heat from the heating coil or the heating cooking container on the top plate while ensuring good light emitting characteristics of the light emitting display part around the coil. Thinning of the cooking device can be realized.

Sectional drawing of the induction heating cooking appliance in Embodiment 1 of this invention The partial expanded sectional view of the light emission display part of the induction heating cooking appliance in Embodiment 1 of this invention The reflective frame perspective view of the light emission display part of the induction heating cooking appliance in Embodiment 1 of this invention Plane external view seen from the upper side of the induction heating cooking appliance in Embodiment 1 of this invention Sectional drawing of the induction heating cooking appliance in Embodiment 2 of this invention The fragmentary perspective view of the light emission display part in Embodiment 2 of this invention. Plane external view of the heating coil unit in Embodiment 2 of the present invention Sectional drawing of the induction heating cooking appliance in Embodiment 3 of this invention The partial expanded sectional view of the light emission display part of the induction heating cooking appliance in Embodiment 3 of this invention The reflective frame perspective view of the light emission display part of the induction heating cooking appliance in Embodiment 3 of this invention Planar external view seen from the top of the induction heating cooking appliance in Embodiment 3 of this invention Sectional drawing of the electromagnetic induction heating cooking appliance in Embodiment 4 of this invention The perspective view of the electromagnetic induction heating cooking appliance in Embodiment 4 of this invention The perspective view of the light emission display part of the conventional induction heating cooking appliance

The first invention is
A body case constituting the outer shell,
A top plate formed of a material that is provided on the upper surface of the main body case and transmits light;
A heating coil provided at the bottom of the top plate;
A light source provided near the outer periphery of the heating coil;
With
A reflective frame having a side wall that reflects light of the light source, a lower opening provided below, and an upper opening that opens upward;
A display member that projects the symbol display by covering the upper opening of the reflective frame and transmitting the symbol display unit by the light emitted from the upper opening;
Further comprising
The light of the light source is incident from below the reflection frame, and emitted from the upper opening to irradiate the back surface of the top plate,
The back surface of the display member is formed to reflect light from the light source.

In the second invention, in particular, the reflection frame of the first invention has a box shape having a bottom surface, and a lower opening is formed in the side wall near the bottom surface or the bottom surface, and the bottom surface is the light source. By reflecting the light, it is possible to ensure better light emission characteristics by reflecting the light even at the bottom surface.

In a third aspect of the invention, in particular, in the first aspect of the invention, the light source is disposed at a position excluding a portion where the symbol display portion of the display member is vertically projected downward, so that the display member can be used even in a narrow space. The light can be reflected while using the back surface of the light source, and a wider range can be lit, and the light unevenness can be reduced because the light from the light source is not directly transmitted upward.

According to a fourth aspect of the present invention, in particular, in the second aspect of the present invention, by further providing a ventilation hole on the bottom surface of the reflection frame excluding a portion where the symbol display portion of the display member is projected vertically downward, the temperature of the light source portion is further reduced. Thus, it is possible to prevent the light emission characteristics from being deteriorated.

According to a fifth aspect of the invention, in particular, in the first aspect, by providing a ventilation hole at a position lower than the light source in the side wall portion of the reflection frame, the temperature of the light source portion is further reduced, and from the reflection frame. Light leakage can be suppressed, and deterioration of the light emission characteristics can be prevented.

In a sixth aspect of the present invention, in particular, in the first aspect of the present invention, the light source substrate further includes a light source on the upper surface and a connector for supplying power to the light source.
The light source is disposed inside the reflective frame;
The connector is disposed outside the reflection frame as viewed from the center of the heating coil, and an eaves covering the upper surface of the connector is provided above the connector. As a result, while preventing light leakage from the light source to the top plate, it is possible to suppress a rise in temperature of the connector portion of the light source substrate, and to reduce the distance between the light source substrate and the top plate, so that it is thin Even when there is no space below the coil unit as in the case of IH, it is possible to configure a light emitting display portion around the coil.

In the seventh invention, particularly in the sixth invention, the reflecting frame and the eaves are integrally formed. Thereby, by integrally molding the reflection frame and the eaves with, for example, resin, the light emitting display portion can be configured more compactly, and the assemblability can be improved.

In an eighth aspect of the invention, in particular, in the first, sixth or seventh aspect of the invention, further comprising a coil base for supporting the heating coil from below,
The reflection frame and the coil base are integrally formed. Thereby, by integrally molding the reflection frame and the coil base with, for example, a resin, the light emitting display unit can be configured more compactly, and the assemblability can be improved.

A ninth invention, in the sixth invention, in particular, further comprises a coil base that supports the heating coil from below,
The upper surface of the connector is disposed at a position higher than the back surface of the coil base. Thereby, thickness reduction of an induction heating cooking appliance is attained.

According to a tenth aspect of the invention, in particular, in the sixth aspect of the invention, further comprising a magnetic shielding plate provided below the heating coil and mounting the heating coil and preventing magnetic flux leakage.
The upper surface of the connector is disposed higher than the back surface of the magnetic shield. Thereby, thickness reduction of an induction heating cooking appliance is attained.

In an eleventh aspect of the invention, in particular, in the tenth aspect of the invention, an outer side wall of the reflection frame is formed between the light source of the light source substrate and the connector, and an opening is provided in the outer side wall. . Thereby, while preventing light leakage from the light source to the top plate by the eaves, it is possible to discharge the hot air in the reflection frame to the outside and suppress the temperature rise of the light emitting substrate.

In the twelfth aspect of the invention, in particular, in the tenth aspect of the invention, an opening hole is provided in a portion where the light source substrate is located on the magnetic shield. Thereby, the temperature of the light source substrate can be reduced.

In the thirteenth invention, in particular, in the sixth invention, a part of the eaves is provided with eaves sidewalls extending downward from the eaves. Thereby, while preventing deformation of an eaves, the temperature rise of the connector part of the board | substrate for light sources can be suppressed, preventing the light leak from a light source to a top plate.

In a fourteenth aspect of the invention, in the first aspect of the invention, the cooling fan,
A duct for guiding cooling air from the cooling fan to the light source;
Is further provided. Thereby, a light source can be cooled intensively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of the induction heating cooker according to the first embodiment of the present invention, and FIG. 2 is a partially enlarged cross-sectional view of the light emitting display portion of the induction heating cooker according to the first embodiment of the present invention. FIG. 3 is a perspective view of a reflection frame of a light-emitting display portion of the induction heating cooker according to the first embodiment of the present invention, and FIG. 4 is an upper view of the induction heating cooker according to the first embodiment of the present invention. It is the plane external view seen from.

1 to 4, a top plate 23 on which a cooking container 22 is placed is provided on the upper surface of a main body case 21 constituting the outer shell, and a heating coil 24 for induction heating the cooking vessel 22 is provided below the top plate 23. It has been.

The heating coil 24 is supported from below by a coil base 25, and ferrites 26 having magnetic collection are arranged radially at the lower part of the heating coil 24 and are held by the coil base 25.

In addition, the heating coil 24 is configured to be divided into an inner coil and an outer coil, and a cylindrical opening hole 27 is provided between the inner coil and the outer coil, and an infrared ray attached to the back surface of the coil base 25. The sensor 28 detects the temperature of the bottom surface of the cooking vessel 22 through the opening hole 27 and controls the current flowing through the heating coil 24 to adjust the induction heating state.

The coil base 25 is placed on a magnetic shielding plate 29 made of aluminum or the like having a magnetic shielding effect in order to eliminate the influence of magnetic flux leakage. The magnetic shield 29 is provided so as to partition the space on the heating coil 24 side and the space on the control unit 30 side. Further, a force is applied upward by a spring 31 provided on the outer shell or the like, and while supporting the heating coil 24 via the coil base 25, the anti-vibration rubber 32 attached to the coil base 25 is pressed against the top plate 23. Yes. The spring 31 is configured to keep the gap between the heating coil 24 and the top plate 23 at a constant distance.

In the vicinity of the heating coil 24, a light emitting display 33 (FIG. 4) showing the position and heating state of the heating coil 24 is provided. The light emitting display 33 near the outer periphery of the coil is disposed so as to surround the light emitting substrate 35 and the light source 34, which is a light source substrate on which a light source 34 (FIG. 2) made of a light emitting element such as an LED is mounted, and reflects light. The frame 36 has a lower opening 37 that opens downward, a reflection frame 39 that has an upper opening 38 that opens upward, and displays the pattern by transmitting the emitted light. It is comprised from the display sheet 40 which is a display member.

The light emitting substrate 35 on which the light source is mounted is disposed so as to close the lower opening 37 of the reflection frame 39, the display sheet 40 is disposed so as to cover the upper opening 38 of the reflection frame 39, and the display sheet 40 is disposed in the reflection frame. 39. Further, in the portion other than the character display portion of the display sheet 40, the front surface is configured not to transmit light by a member such as black, and the back surface is printed or light-reflected so as to reflect light. Sheets with reflective properties are stacked.

The resin constituting the reflection frame 39 needs to be molded with a resin having a relatively high light reflectance that can increase the luminance of the display unit. On the other hand, in order to prevent light leakage from the light-emitting display portion 33 (FIG. 4) and see-through from the top plate 23, it is preferable to mold the resin with a low light reflectance. In this Embodiment, in order to make these compatible, it comprises with resin of gray or brown, for example.

Further, although the coil base 25 is made of resin integrally with the reflection frame 39, it may be made of another member. When the coil base 25 and the reflection frame 39 are formed of different members, the coil base 25 is preferably molded in black.

Also, the installation position of the light source 34 is arranged at a place other than the position where the symbol display unit 42 that transmits the light of the display sheet 40 and displays the symbol is vertically projected. Ventilation holes 44a (FIG. 3) for releasing hot air are provided on a part of the bottom surface 43 of the reflection frame 39 except for a portion in which the symbol display part 42 that transmits light of the display sheet 40 is vertically projected. Ventilation holes 44 b (FIGS. 2 and 3) are provided in a part of the side wall 36 of the frame 39. In addition, when this ventilation hole 44b is provided in the height lower than the light emission surface of a light source, the light leakage from the light source 34 can be suppressed.

About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.
When the cooking container 22 is placed at the heating position on the top plate 23 and the heating switch is pressed to start heating, the light source 34 is turned on, and the light emitted from the light source 34 is reflected on the bottom surface 43 of the reflection frame 39 and While reflecting the back surface of the side wall 36 or the display sheet 40, the symbol display section 42 of the display sheet 40 is turned on while spreading over the entire reflection frame 39, and the user is lit and displayed through the light transmission section of the top plate 23. It is possible to recognize the heated pattern and the heating zone.

The reflection frame 39 is molded from a gray or brown resin having a relatively high light reflectance, so that it can be reflected in a wide range with a small light source, and even if only a narrow space can be secured, good light emission characteristics are secured. can do.

Further, the display sheet 40 is sandwiched between the reflection frames 39, the reflection frame 39 is made of gray or brown, and the surface of the display sheet 40 is formed in black, so that the light emitting display portion 33 (FIG. 4) Light leakage is suppressed, and since it is difficult to see through the light transmitting portion of the top plate 23, a good light emitting display state can be maintained.

In addition, since the light source 34 is disposed at a position other than the position where the light is transmitted through the display sheet 40 and the pattern display portion is vertically projected, an even wider range can be obtained while reflecting the light from the light source 34 even in a narrow space. Can be turned on, and light from the light source 34 is not directly transmitted upward, so that unevenness in light can be reduced.
Further, as shown in FIGS. 1 and 2, a rib 39 a is provided between the position where the portion of the display sheet 40 that transmits light and displays the pattern is vertically projected, and the light source 34. Unevenness can be reduced.

On the other hand, when induction heating starts, detection of the bottom of the pan by the infrared sensor 28 (FIG. 1) is started, but the infrared detection path and the coil base 25 surrounding the periphery use gray, brown, or black. The infrared sensor 28 can detect the temperature at the bottom of the pan with high accuracy and is not easily affected by ambient light.

The light emitting display unit 33 also has a display function that makes it easy to understand the heating position, and is disposed as close to the heating coil 24 as possible, so that it is easily affected by heat generated by the heating coil 24 and heat from the cooking vessel 22.

Further, since the configuration is a thin IH, the space below the magnetic shield 29 occupies the control unit 30 and a duct for cooling the space, and the heating coil 24 and its peripheral light emitting means include The structure has a structure in which the cooling air does not flow easily.

However, in the reflection frame 39, ventilation holes 44a and 44b are provided at positions lower than the light emitting surface of the light source 34 on the bottom surface 43 and the side wall 36 excluding the portion where the symbol display portion 42 of the display sheet 40 is vertically projected. While reducing the temperature around the light source 34, the light leakage from the reflection frame 39 can be suppressed, and the light emission characteristics can be prevented from deteriorating.

In addition, in this Embodiment, although the display member was comprised with the display sheet 40, it is not restricted to this. For example, a configuration may be adopted in which a pattern is formed on the upper surface of the reflection frame 39 and projected, or may be formed by printing on the top plate 23. As a result, the number of parts can be reduced, which is advantageous from the viewpoint of cost and man-hours.

In the present embodiment, the reflection frame 39 is molded from a gray or brown resin. However, another member that is molded in white having a high reflectance and is colored in black or black is provided around it. It may be attached. As a result, it is possible to further secure the light amount and suppress the light unevenness.

(Embodiment 2)
FIG. 5 is a cross-sectional view of the induction heating cooker according to the second embodiment of the present invention, and FIG. 6 is a partial perspective view of the light emitting display unit according to the second embodiment of the present invention. FIG. 7 is a plan external view of the heating coil unit according to Embodiment 2 of the present invention.

A top plate 23 on which the cooking vessel 22 is placed is provided on the upper surface of the main body case 1 constituting the outer shell, and a heating coil 24 for inductively heating the cooking vessel 22 is provided below the top plate 23. The heating coil 24 is supported from below by a coil base 25, and ferrite 26 having magnetic collection is radially held by the coil base 25 below the heating coil 24.

The coil base 25 is placed on a magnetic shielding plate 29 made of aluminum or the like having a magnetic shielding effect in order to eliminate the influence of magnetic flux leakage. Further, the magnetic shield 29 is provided so as to partition the space on the heating coil 24 side and the space on the control unit side. Further, a vibration is applied to the top plate 23 with a vibration-proof rubber 32 attached to the coil base 25 while a force is applied upward by a spring 31 provided in the main body case 21 and the like to support the heating coil 24 via the coil base 25. Pressed. The spring 31 is configured to keep the gap between the heating coil 24 and the top plate 23 at a constant distance.

In the vicinity of the outer periphery of the heating coil 24, a light-emitting display portion 33 that indicates the position and heating state of the heating coil 24 is provided. A light-emitting display unit 33 provided in a square near the outer periphery of the heating coil 24 includes a light-emitting substrate 35 having a light source 34 composed of a light-emitting element such as an LED and a connector 12 for supplying power to the light source 34, and the light source 34 and its upper transmission. It is comprised from the frame 15 which encloses the light emission surfaces 14, such as a display sheet which displays a pattern with the light which performed, from the side. The connector 12 on the light emitting substrate 35 is arranged outside the frame 15 as viewed from the coil center and at a position where the upper surface of the connector 12 is above the magnetic shield 29, and the light emitting substrate 35 is fixed to the coil base 25 by screwing. Has been. The frame body 15 is configured integrally with the coil base 25, and a hood 16 is provided above the connector 12 and outside the upper portion of the frame body 15. An opening 18 is provided in the side wall 17 of the frame 15 located between the light source 34 of the light emitting substrate 35 and the connector 12.

On the other hand, the magnetic shield plate 29 has a substantially square shape, and the light emitting substrate 35 is positioned at the corner portion. The opening hole 19 is provided in the portion of the magnetic shield plate 29 where the light emitting substrate 35 is positioned, An outer peripheral side wall 20 is provided on the outer periphery of the magnetic shield plate 29, and the height of the outer peripheral side wall 20 at the corner portion where the light emitting substrate 35 and the eaves 16 are positioned is made lower than the straight portion 11.

Further, the eaves 16 provided on the upper part of the frame body 15 of the coil base 25 is provided with eaves side walls 16a extending downward, and further provided with eaves vertical walls 16b partially extending to the magnetic shield 7 to form an air passage. ing.

In addition, the space below the magnetic shield 29 is occupied by the board and the board case 10 surrounding the board because of the thin IH, but the light source 34 and the connector 12 on the light emitting board 35 need to be cooled. The substrate case 10 below the light emitting substrate 35 is provided with an opening hole 19 for blowing cooling air, a duct 3 for changing the air direction, etc. so that a part of the cooling air from the fan 1 also turns to the light emitting substrate 35. Yes.

About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.
When the cooking container 22 is placed at the heating position on the top plate 23 and heating is started by the heating switch, the light source 34 is energized via the connector 12 on the light emitting substrate 35 in the vicinity of the heating coil 24, and the light emitting display is performed. The unit 33 is lit and the user can recognize the heating state and the heating zone. Further, as the heating starts, the cooling fan 1 also starts to rotate, and the board components in the board case 10 arranged in the space below the magnetic shield 29 are mainly cooled.

The light emitting display unit 33 also has a display function that makes it easy to understand the heating position, is arranged as close to the heating coil 24 as possible, and is easily affected by heat generated by the heating coil 24 and heat from the cooking vessel 22.
However, since the eaves 16 are provided above the upper portion of the frame 15 above the connector 12, the radiant heat transmitted from the top plate to the connector 12 on the light emitting substrate 35 during heating can be reduced. Although it is configured to be disposed at a position above the magnetic shield plate 29, the temperature rise of the connector 12 on the light emitting substrate 35 can be suppressed. Similarly, even if the upper surface of the connector 12 is arranged at a position higher than the back surface of the coil base 25, the temperature rise of the connector 12 can be suppressed, and thus the device can be particularly thinned.

The frame body 15 can be made by changing the resin color, etc., as a separate part from the coil base 25. However, in this embodiment, the frame body 15 is configured integrally with the coil base 25 in order to give priority to space and assembly. ing. The eaves 16 also extend outward from the upper part of the frame 15 integrally formed with the coil base 25, whereby the light emitting display portion 33 can be configured more compactly and the assemblability can be improved.

In addition, since the opening 18 is provided in the side wall 17 of the frame 15 located between the light source 34 of the light emitting substrate 35 and the connector 12, the eaves 16 prevents light leakage from the light source 34 to the top plate. The hot air in the frame 15 can be discharged to the outside, and the temperature rise of the light emitting substrate 35 can be suppressed.

A part of the cooling air in the substrate case 10 is caused by the opening hole 19 provided in the substrate case 10 and the duct 3 that changes the direction of the wind, as shown by the one-dot chain line in FIG. It blows up around the light emitting substrate 35 disposed in the corner portion, passes through the opening hole 19 around the light emitting substrate 35 provided on the magnetic shielding plate 29, hits the eaves 16, and further, the outer peripheral side wall of the corner portion of the magnetic shielding plate 29 The cooling air is guided to 20 through the lower portion of the outer peripheral side wall 20. The flow of the cooling air can suppress the temperature rise of the connector 12 and the light source 34 on the light emitting substrate 35, and the durability of the components can be increased.

Further, the eaves 16 provided on the upper portion of the frame body 15 of the coil base 25 is provided with eaves side walls 16a extending downward, and further provided with eaves vertical walls 16b partially extending to the magnetic shield plate 29 to form an air passage. Therefore, the cooling air flowing in from the opening hole 19 of the magnetic shield plate 29 is difficult to spread to the surroundings, and the connector 12 is surely cooled and escapes from the lower part of the outer peripheral side wall 20 of the magnetic shield plate 29. Can be increased.

In the second embodiment, the light source 34 and the reflection frame 39 are respectively provided at the four corners of the substantially square magnetic shield 29, and the connector 12 of the light emitting substrate 35 is configured on the outside thereof. As a result, the position of the heating unit is indicated to the user to improve usability, and the device can be thinned by effectively using the horizontal space.

Conventionally, since the light-emitting display unit is easily affected by heat from the heating coil and the heating cooker on the top plate, the light-emitting substrate is kept away from the top plate, and the height of the coil unit made up of coils and ferrite. It is necessary to take measures such as fixing to a lower position than the position, or arranging the connector on the back side of the light-emitting substrate which is not easily affected by heat, so that the cooling air can easily hit. On the other hand, according to the configuration of the present embodiment, the light emitting substrate 35 can be brought close to the top plate 25, and the device can be further thinned.

The light emitting substrate and the opening hole are positioned at the corner portion of the magnetic shielding plate, and the height of the outer peripheral wall of the corner portion of the magnetic shielding plate is made lower than the straight portion so that the cooling air can escape from the corner portion by the side wall of the magnetic shielding plate. Therefore, the cooling effect of the components on the light emitting substrate is improved, and the corner portion is low so that the magnetic shield plate can be easily processed.

Note that the configuration in the second embodiment may be applied to the first embodiment or the third embodiment to be described later. In this case, the frame body 15 in the second embodiment may be used as the reflection frame 39.

(Embodiment 3)
FIG. 8 is a cross-sectional view of the induction heating cooker according to Embodiment 3 of the present invention, and FIG. 9 is a partially enlarged cross-sectional view of the light emitting display portion of the induction heating cooker according to Embodiment 3 of the present invention. FIG. 11 is a perspective view of the reflection frame of the light-emitting display portion of the induction heating cooker according to the third embodiment of the present invention, and FIG. 11 is a plan external view seen from above the induction heating cooker according to the third embodiment of the present invention. The third embodiment relates to an induction heating cooker including a modification of the reflection frame 39 of the first embodiment, and the point that a reflection frame storage portion 41 is further provided outside the reflection frame 39 is an embodiment. Different from 1. Here, differences from the first embodiment will be mainly described.

The resin constituting the reflection frame 39 is molded from a white resin having a high light reflectivity that can increase the luminance of the display unit. On the other hand, the coil base 25 is used for light leakage and ceiling of the light emitting display unit 33 (FIG. 11). In order to prevent see-through from the plate 23, it is molded from a black resin having a low light reflectance.

In addition, the end surface of the storage unit upper opening 45 of the reflection frame storage unit 41 of the coil base 25 is positioned inside the end surface of the upper opening 38 of the reflection frame 39, and a part of the portion of the display sheet 40 that does not transmit light Covering and blocking the radiation heat from the heated cooking container 22 placed on the top plate 23 as much as possible, thereby suppressing the heat from being transmitted to the lower light source 34 and the temperature rise.

Further, a gap 46 of about 0.5 mm is secured between the reflection frame storage part 41 of the coil base 25 and the side wall 36 of the reflection frame 39, and the heat of the heating coil is reflected by the reflection frame storage part of the coil base 25. The heat conduction to the reflection frame 39 is suppressed via 41.

About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.
When the cooking vessel 22 is placed at the heating position on the top plate 23 and the heating switch is pressed to start heating, the light source 34 is turned on, and the light emitted from the light source 34 is a white resin with high light reflectance. While reflecting the bottom surface 43 of the molded reflection frame 39 and the side wall 36 or the back surface of the display sheet 40, the pattern display portion 42 of the display sheet 40 is turned on while spreading over the entire reflection frame 39, and the light transmission of the top plate 23 is further performed. Through the unit, the user can recognize the light-emitting symbol and recognize the heating state and the heating zone.

Since the reflecting frame 39 is molded with a white resin having a high light reflectance, it can be reflected in a wide range with a small number of light sources, and good light emission characteristics can be secured even when only a narrow space can be secured. .

Further, the display sheet 40 is sandwiched between the reflection frame 39 and the reflection frame storage portion 41 of the coil base 25, and the reflection frame 39 is covered with the black coil base 25 having a low light reflectance. 33 (FIG. 11) does not leak light and is difficult to see through the light transmitting portion of the top plate 23, so that a good light emitting display state can be maintained.

On the other hand, when induction heating is started, detection of the bottom of the pan by the infrared sensor 28 (FIG. 8) is started, but the infrared detection path and the coil base 25 surrounding the periphery use black having low light reflectance. For this reason, the infrared sensor 28 can detect the pan bottom temperature with high accuracy and is not easily affected by ambient light.

However, since the end face of the upper opening 45 of the reflection frame storage part 41 of the coil base 25 is positioned inside the upper opening 38 of the reflection frame 39, the radiant heat transmitted from the cooking container 22 to the top plate 23 is reduced to the coil base. 25, the temperature rise near the light source 34 can be suppressed.

Further, by providing a gap between the side wall 36 outside the reflection frame 39 and the inner wall 46 of the reflection frame storage portion 41 of the coil base 25, heat conduction from the coil base 25 due to heat generated by the heating coil 24 can be reduced. It is possible to suppress the temperature rise near the light source 34.

(Embodiment 4)
FIG. 12: shows sectional drawing of the electromagnetic induction heating cooking appliance in Embodiment 4 of this invention. FIG. 13: shows the perspective view of the electromagnetic induction heating cooking appliance in Embodiment 4 of this invention. In the fourth embodiment, a dedicated duct for cooling the light source is provided in the configuration of the first to third embodiments, and the cooling configuration will be mainly described below.

12 and 13, the electromagnetic induction heating cooker according to the fourth embodiment has a substantially annular light guide that is substantially concentric with a heating coil that supplies a high-frequency current to induction-heat the pan placed on the top plate. And a light-emitting display unit that causes light to be incident on the light guide from an LED that is a light source and shine in a substantially ring shape.
The dedicated duct entrance 2 sucks cooling air from the cooling fan 1. The dedicated duct 3 is disposed between the electromagnetic induction heating coil 8 and the control circuit 9, and guides cooling air from the dedicated duct entrance 2 to the LED 7 of the light emitting display unit disposed below the top plate. The dedicated duct 3 is formed by forming a ceiling with a sheet metal 4 made of a hot dip galvanized steel sheet having conductivity and molding a polypropylene resin having excellent flame retardancy and insulation on the other surface.

The sealing 6 is made of a foam material having EPDM (ethylene / propylene / diene terpolymer) rubber as a main component and having excellent heat resistance, weather resistance, and chemical resistance, and encloses the dedicated duct outlet 5 to be sealed. The cooling air is provided so as not to leak through the gap and diffuse.
The control circuit 9 is a control circuit that controls the heating output by driving an inverter that supplies a high-frequency current to the electromagnetic induction heating coil 8.

Note that the arrow indicates the flow of cooling air.

The operation and action of the electromagnetic induction cooking device configured as described above will be described below.

When the cooking starts, the cooling fan 1 rotates to take in the outside air and blow it into the electromagnetic induction heating cooker. A part of the cooling air is sucked into the dedicated duct inlet 2 by the action of air pressure. The sucked cooling air is blown out from the dedicated duct outlet 5 through the dedicated duct 3. The blown cooling air hits the LED 7 of the light emitting display unit without being diffused by the ceiling 6 and is discharged from the discharge port on the side surface of the main body outer shell to cool the LED 7 of the light emitting display unit intensively and efficiently. be able to.

Moreover, since the ceiling of the dedicated duct 3 is composed of a sheet metal 4 such as a hot-dip galvanized steel sheet, when a high-frequency current is supplied to the electromagnetic induction heating coil 8 during cooking, the ceiling of the dedicated duct 3 is located below the electromagnetic induction heating coil 8. There is an effect of shielding the electromagnetic wave directed to the control circuit 9 with the sheet metal 4 interposed therebetween. Thereby, mutual interference between the electromagnetic induction heating coil 8 and the control circuit 9 can be suppressed.

Further, a plurality of LEDs 7 of the light emitting display section are arranged, a substantially annular ring is formed by connecting a circular arc with a plurality of light guides, and the dedicated duct 3 is branched so as to be connected to each LED 7 of the light emitting display section. May be.

As described above, the induction heating cooker according to the present invention secures the durability by suppressing the temperature rise while ensuring the good light emission characteristics of the light emitting display means for emitting and displaying the position and operation state of the heating coil. Can do. Therefore, the present invention can be applied not only to an induction heating cooker but also to various devices that perform light emission display using light emitting means.

DESCRIPTION OF SYMBOLS 1 Cooling fan 2 Dedicated duct entrance 3 Dedicated duct 4 Sheet metal 5 Dedicated duct outlet 6 Ceiling 7 LED
DESCRIPTION OF SYMBOLS 8 Electromagnetic induction heating coil 9 Control circuit 10 Board | substrate case 11 Straight part 12 Connector 14 Light emission surface 15 Frame 16 Eaves 16a Eave side wall 16b Eave vertical wall 17 Side wall 18 Opening part 19 Open hole 20 Outer peripheral side wall 21 Main body case 23 Top plate 24 Heating Coil 25 Coil base 28 Infrared sensor 34 Light source 36 Side wall 37 Lower opening 38 Upper opening 39 Reflecting frame 40 Display sheet 41 Reflecting frame storage part 42 Symbol display part 43 Bottom surface 44a, 44b Ventilation hole 45 Storage part upper opening

Claims

A body case constituting the outer shell,
A top plate formed of a material that is provided on the upper surface of the main body case and transmits light;
A heating coil provided at the bottom of the top plate;
A light source provided near the outer periphery of the heating coil;
With
A reflective frame having a side wall that reflects light of the light source, a lower opening provided below, and an upper opening that opens upward;
A display member that projects the symbol display by covering the upper opening of the reflective frame and transmitting the symbol display unit by the light emitted from the upper opening;
Further comprising
The light of the light source is incident from below the reflection frame, and emitted from the upper opening to irradiate the back surface of the top plate,
The back surface of the display member is an induction heating cooker formed to reflect light from the light source.
The said reflection frame is made into the box shape which has a bottom face, The lower opening part is formed in the said side wall of the said bottom face or the said bottom face, The said bottom face reflects the light of the said light source. Induction heating cooker.
The induction heating cooker according to claim 1, wherein the light source is disposed at a position excluding a portion where a symbol display portion of the display member is projected vertically downward.
The induction heating cooker according to claim 2, wherein a ventilation hole is provided on a bottom surface of the reflection frame excluding a portion where the symbol display portion of the display member is projected vertically downward.
The induction heating cooker according to claim 1, wherein a ventilation hole is provided at a position lower than the light source on the side wall of the reflection frame.
A light source substrate having a connector for supplying power to the light source and the light source on an upper surface;
The light source is disposed inside the reflective frame;
2. The induction heating cooker according to claim 1, wherein the connector is disposed outside the reflection frame as viewed from the center of the heating coil, and an eaves covering the upper surface of the connector is provided above the connector.
The induction heating cooker according to claim 6, wherein the reflection frame and the eaves are integrally formed.
A coil base for supporting the heating coil from below;
The induction heating cooker according to claim 1, wherein the reflection frame and the coil base are integrally formed.
A coil base for supporting the heating coil from below;
The induction heating cooker according to claim 6, wherein an upper surface of the connector is disposed at a position higher than a rear surface of the coil base.
A magnetic shield provided on the lower side of the heating coil for mounting the heating coil and preventing magnetic flux leakage;
The induction heating cooker according to claim 6, wherein an upper surface of the connector is disposed at a position higher than a rear surface of the magnetic shielding plate.
The induction heating cooker according to claim 6, wherein an outer side wall of the reflection frame is formed between the light source of the light source substrate and the connector, and an opening is provided in the outer side wall.
The induction heating cooker according to claim 10, wherein an opening hole is provided in a portion of the magnetic shield plate where the light source substrate is located.
The induction heating cooker according to claim 6, wherein a part of the eaves is provided with eaves side walls extending downward from the eaves.
A cooling fan,
A duct for guiding cooling air from the cooling fan to the light source;
The induction heating cooker according to claim 1, further comprising: