JP2014123425A - Induction heating cooker - Google Patents

Abstract

An object of the present invention is to ensure good light emission characteristics of a light emitting display portion around an induction heating coil even in a narrow space.
A light source provided near the outer periphery of a heating coil, a side wall for reflecting light from the light source, a reflecting frame for preventing light from diffusing sideways, and a heating coil are disposed below. And a coil base 25 having a reflection frame housing portion 41 to which the reflection frame 39 is attached. The reflection frame 39 has upper and lower openings so as to radiate upward while reflecting light incident from below. In addition, by making the light reflectivity of the inner surface larger than the light reflectivity of the coil base, it is possible to obtain good light emission characteristics of the light emitting display section even in a narrow space, and further, the reflection frame 39 is made to have the light reflectivity. By storing in the reflection frame storage part 41 of the low coil base 25, it can be set as the structure which is hard to permeate | transmit light and is difficult to see through from a top plate.
[Selection] Figure 2

Description

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

  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 one 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 emission display part of the said conventional induction heating cooking appliance has a structure as shown, for example 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 the light from the light source 1, the light emitting substrate 2 having the light source 1, the box 3 configured to surround the light emitting substrate 2 and having an opening through which light is transmitted. A display sheet 6 on which the bright portion 4 and the opaque portion 5 are formed by printing is placed so as to cover the upper opening of the box 3, and emitted from the light source 1 from below to above the display sheet 6. The display sheet 6 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 reflective frame, and a coil base that supports the heating coil from below and has a reflective frame housing portion to which the reflective frame is attached. The reflective frame has a lower opening that opens downward and an upper opening that opens upward. And the light emitted from the upper opening is radiated upward while reflecting the light incident from the lower opening, and the light reflectivity of the inner surface of the side wall of the reflection frame is adjusted to the coil base. It is set as the structure made larger than the light reflectivity of this.

  Thus, by making the light reflectivity of the inner surface of the reflection frame larger than the light reflectivity of the coil base, the light of the light source such as the LED can be diffused while being reflected by the reflection frame. Good light emission characteristics can be obtained. Furthermore, by storing the reflecting frame in the coil-based reflecting frame storing portion having a low light reflectivity, it is difficult to transmit light, and it is also difficult to see from the top plate.

  In terms of cost, the coil base can be constructed at a lower cost than the case where a filer or the like is contained in a resin having a high light reflectance such as white to enhance heat resistance and light shielding properties.

  In addition, the induction heating cooker of the present invention is such that the upper opening end face of the reflection frame housing part of the coil base is positioned inside the upper opening part of the reflection frame, or the side wall outside the reflection frame and the reflection frame housing part of the coil base. By reducing the radiant heat and conduction heat from the cooking container and heating coil by providing a gap between the inner walls, the temperature rise near the light source is suppressed, the durability of the light source is increased, and good light emission characteristics are maintained. Can do.

  Further, 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 The perspective view of the light emission display part of the conventional induction heating cooking appliance

According to a first aspect of the present invention, there is provided a main body case constituting an outer shell, a top plate formed on a top surface of the main body case and made of a light transmitting material, a heating coil provided at a lower portion of the top plate, and the heating A light source provided in the vicinity of the outer periphery of the coil, a reflection frame that has a side wall that reflects light from the light source, prevents the light from diffusing laterally, and supports the heating coil from below and is attached to the reflection frame And a coil base having a reflection frame storage portion, wherein the reflection frame has a lower opening opening downward and an upper opening opening upward, and light is incident from the lower opening. The light emitted from the upper opening irradiates the back surface of the top plate, and the light reflectance of the inner surface of the side wall is made larger than the light reflectance of the coil base.

  As a result, light from a light source such as an LED can be diffused while being reflected by the reflection frame, so that it is possible to obtain good light emission characteristics of the light emitting display unit even in a narrow space, and the reflection frame can be made into a coil base with low light reflectance. By storing it, it is difficult for the light to be seen through, and it is also difficult to see through the top plate. In terms of cost, the coil base is advantageous in that it can be constructed at a lower cost than a resin having a high reflectivity such as white and containing a filer or the like to enhance heat resistance and light shielding properties.

  In the second invention, in particular, the reflection frame of the first invention has a box shape having a bottom surface, a lower opening is formed in the bottom surface, and the light reflectance of the inner surface of the bottom surface is determined by the light of the coil base. By making it larger than the reflectance, even better light emission characteristics can be secured by reflecting light even at the bottom surface.

  In a third aspect of the invention, in particular, in the first or second aspect of the invention, a display sheet is provided that covers the upper opening and displays a symbol when light emitted from the upper opening is transmitted. By being sandwiched between the lower surface of the flange portion provided at the upper end of the portion and the upper surface of the side wall of the reflection frame, light leakage can be reliably prevented and the display sheet can be securely held.

  In a fourth aspect of the invention, in particular, in any one of the first to third aspects of the invention, the light source is arranged at a position excluding the portion where the symbol display portion of the display sheet is vertically projected, thereby displaying even in a narrow space. Light can be reflected while using the back side of the sheet, and a wider range can be lit, and light from the light source is not directly transmitted upward, thereby reducing light unevenness.

  In the fifth invention, in particular, the upper opening end surface of the reflection frame housing part of the coil base according to any one of the first to fourth inventions is positioned inside the upper opening of the reflection frame, so that The radiant heat transmitted through the top plate can be blocked by the coil base, and the temperature rise near the light source can be suppressed.

  According to the sixth aspect of the present invention, in particular, by providing a gap between the outer side wall of the reflection frame of any one of the first to fifth aspects and the inner wall of the reflection frame housing part of the coil base, the heating coil generates heat. Heat conduction from the coil base can be reduced, and temperature rise near the light source can be suppressed.

  In a seventh aspect of the invention, in particular, in any one of the first to sixth aspects of the invention, a ventilation hole is provided on the bottom surface of the reflection frame excluding a portion where the symbol display portion of the display sheet is vertically projected, thereby providing a further light source. It is possible to prevent the light emission characteristics from being lowered while reducing the temperature of the part.

  In the eighth aspect of the invention, in particular, the temperature of the light source unit is further reduced by providing a ventilation hole at a position lower than the light emitting surface of the light source in the side wall portion of the reflection frame of any one of the first to seventh aspects of the invention. At the same time, light leakage from the reflection frame can be suppressed, and deterioration of the light emission characteristics can be prevented.

  In the ninth aspect of the invention, in particular, a cylindrical opening hole is provided in the coil base according to any one of the first to eighth aspects, and an infrared sensor for detecting the temperature of the pan bottom is provided in the opening below the opening hole. As a result, the coil base is molded from a resin having a low light reflectance such as black, so that it is not easily affected by ambient light, and the sensor can accurately detect the pan bottom temperature.

  In the tenth aspect of the invention, in particular, the display sheet is abolished or printed only by medium printing by forming a pattern to be displayed at the upper opening of the coil-based reflection frame housing portion of any one of the first to ninth aspects. This makes it possible to reduce the number of plates, which is advantageous in terms of cost.

  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 a top view of the induction heating cooker according to the first embodiment of the present invention. FIG.

  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 that induction-heats the cooking container 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 radially arranged below the heating coil 24 and held by the coil base 25.

  The heating coil 24 is 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 sensor attached to the back surface of the coil base 25. 28, the temperature of the bottom surface of the cooking container 22 is detected through the opening hole 27 to control the current flowing through the heating coil 24 to adjust the induction heating state.

  In order to eliminate the influence of magnetic flux leakage, the coil base 25 is placed on a magnetic shielding plate 29 made of aluminum having a magnetic shielding effect. The magnetic shielding plate 29 is a space on the heating coil 24 side and a space on the control unit 30 side. The vibration-proof rubber 32 attached to the coil base 25 is attached to the ceiling while the heating coil 24 is supported via the coil base 25 by applying a force upward by a spring 31 provided on the outer shell or the like. The gap between the heating coil 24 and the top plate 23 is maintained at a constant distance by pressing against the plate 23.

  In the vicinity of the heating coil 24, a light-emitting display portion 33 (FIG. 4) that indicates the position and heating state of the heating coil 24 is provided. The light emitting display portion 33 in the vicinity of the outer periphery of the coil has a light emitting substrate 35 on which a light source 34 (FIG. 2) made of a light emitting element such as an LED is mounted, and a side wall 36 that surrounds the light source 34 and reflects light. And a lower frame 37 that opens downward, a reflective frame 39 having an upper opening 38 that opens upward, and a display sheet 40 that displays the pattern by transmitting the emitted light. ing.

  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 reflection frame 39 is a coil. The display sheet 40 is configured to be fitted and fixed from below to a reflection frame housing portion 41 that is shaped from the outer shape of the reflection frame 39 provided at the four corners of the base 25, and the display frame 40 and the reflection frame housing portion 41 of the coil base 25. Is sandwiched between.

  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. 4). In order to prevent see-through from the plate 23, it is molded from a black resin having a low light reflectance.

  The light source 34 is disposed at a position 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 44b (FIGS. 2 and 3) are provided in a part of the side wall 36 of the frame 39 at a position lower than the light emitting surface of the light source.

  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, so that the heat is transmitted to the lower light source 34 and the temperature rise is suppressed.

  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. 4) does not leak, and it 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.

  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.

  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 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.

  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, and thus is easily affected by heat generated by the heating coil 24 and heat from the cooking container 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 It has a structure in which the cooling air does not flow easily.

  However, since the end face of the upper opening 45 of the reflection frame housing 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.

  Further, 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 a portion where the symbol display portion 42 of the display sheet 40 is vertically projected. While reducing the temperature around the light source 34, light leakage from the reflection frame 39 can be suppressed, and deterioration of the light emission characteristics can be prevented.

(Embodiment 2)
In the present embodiment, the main configuration is the same as that of the first embodiment, and the configuration of different parts will be described below.

  By forming the symbol to be displayed in the upper opening of the reflection frame housing part 41 of the coil base 25, the number of plates can be reduced, such as abolishing the display sheet or using only medium printing, which is advantageous in terms of cost.

  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. 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 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 part 38 Upper opening part 39 Reflection frame 40 Display sheet 41 Reflection frame storage part 42 Symbol display part 43 Bottom surface 44a, 44b Ventilation hole 45 Upper opening of storage

Claims (10)

A main body case constituting the outer shell, a top plate formed on the upper surface of the main body case and made of a material that transmits light, a heating coil provided at a lower portion of the top plate, and provided near the outer periphery of the heating coil. A light source, a reflection frame that has a side wall that reflects the light of the light source and prevents the light from diffusing laterally, and a reflection frame storage unit that supports the heating coil from below and to which the reflection frame is attached. The reflection frame has a lower opening that opens downward, and an upper opening that opens upward, and receives light from the lower opening, and the upper opening An induction heating cooker in which the light emitted from irradiates the back surface of the top plate, and the light reflectance of the inner surface of the side wall is larger than the light reflectance of the coil base. 2. The induction according to claim 1, wherein the reflection frame has a box shape having a bottom surface, a lower opening is formed in the bottom surface, and the light reflectance of the inner surface of the bottom surface is larger than the light reflectance of the coil base. Cooking cooker. A display sheet that covers the upper opening and displays a symbol by transmitting light emitted from the upper opening, and the display sheet includes a lower surface of a flange portion provided at an upper end of the reflection frame storage unit and an upper surface of a side wall of the reflection frame. The induction heating cooker according to claim 1 or 2, sandwiched between the two. The induction heating cooker of any one of Claims 1-3 which has arrange | positioned the light source in the position except the part which projected the symbol display part of the display sheet perpendicularly | vertically. The induction heating cooker according to any one of claims 1 to 4, wherein an end surface of the upper opening portion of the coil-based reflection frame housing portion is positioned inside the upper opening portion of the reflection frame. The induction heating cooker of any one of Claims 1-5 which provided the clearance gap between the side wall of a reflective frame outer side, and the inner wall of the reflective frame storage part of a coil base. The induction heating cooker of any one of Claims 1-6 which provided the ventilation hole in the bottom face of the reflective frame except the part which projected the symbol display part of the display sheet perpendicularly. The induction heating cooker of any one of Claims 1-7 which provided the ventilation hole in the position lower than the light emission surface of a light source in the side wall part of a reflective frame. The induction heating cooker of any one of Claims 1-8 which provided the cylindrical opening hole in the coil base, and provided the infrared sensor which detects the temperature of a pan bottom in the opening part under the said opening hole. The induction heating cooking appliance of any one of Claims 1-9 which formed the symbol displayed on the upper opening part of the reflection frame storage part of a coil base.