WO2004023846A1

WO2004023846A1 - Induction heating cooker

Info

Publication number: WO2004023846A1
Application number: PCT/JP2003/008887
Authority: WO
Inventors: Tetsuya Kaji
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2002-07-12
Filing date: 2003-07-14
Publication date: 2004-03-18
Also published as: EP1536668B1; KR100917726B1; KR20050021457A; JP4081086B2; CN100456897C; AU2003298883A1; EP1536668A4; CN1669360A; EP1536668A1; HK1080672A1; JPWO2004023846A1

Abstract

An induction heating cooker, comprising a light source storage part (17) for storing a light source (6) for providing, with a simple structure, a light emitting part having a light source part improved in unevenness of light emission and leakage of light, the light source storage part (17) further comprising a coil holding stand (15), a light shielding cover for covering a part of a light guiding body (7) and the upper part of the light source, and a substrate for placing the light source thereon, whereby light from the light source storage part can be prevented from leaking to the outside, and the radiation of light from the portion of the light guiding body corresponding to the light source storage part (17) can be intensified.

Description

Technical documents Induction heat treatment technology

The present invention relates to an induction heating heater used in a home garden, and in particular, the light is applied to the upper surface of the top plate on which the object to be heated such as a pot is placed. For light-emitting devices that provide visual indication. Landscape technology

In a heating heater, a high frequency current is flowed through a heating coil to generate a high frequency magnetic field, and a pot etc. that is magnetically coupled to the heating coil (load) Due to the eddy current generated by the high frequency magnetic field generated by the high frequency magnetic field, the joule heat is generated in the pot, so the pot itself generates heat and the food You can cook. In the induction heating system, the pot itself generates heat, so the gas conditioner that can see flames and the heating unit are different from the electric heaters that heat up, induction heating is different. There is a problem that it has not been possible to visually grasp (recognize) the state.

A light emitting display device for solving this problem is disclosed in Japanese Patent Application Publication No. 2 0 0 0 1-1 0 6 4 8 3 Prior art FIG. 7 shows the above-mentioned publication. Shows the cross section of the leading technology induction heating cooler described. In Fig. 7, the top plate 2 of the insulator is set on the top of the main body 1 that constitutes the shell. Heated material 3 such as a pot is placed on the paper plate 2 b

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Ru Below the cup plate 2, a heating coil 4 for induction heating the object 3 is provided. A light emitting unit 5 is provided under the heating coil 4. The light emitting unit 5 is composed of a light source 6 and a light guide 7, and emits light from the light emitting surface 8 toward the light transmitting surface 2. Heating coil, light emitting part

5 is controlled by control unit 9

When a predetermined high frequency current is applied to the heating coil 4, the object 3 to be heated is heated by induction heating. The light source 6 is turned on in conjunction with the power supply, and the light is guided to the light guide 7 and emitted from the light emitting surface 8, and is emitted to the lower surface of the light source 2. Ru This light passes through the top plate 2 and is emitted to the top surface, and the top surface of the top plate 2 has a circular ring as shown in FIG. 8 by the cross hatching. The pattern of light is drawn. With this pattern, the user faces the heating coil 4 which is in the inductively heated state where the portion indicated by the light pattern is energized (the upper side of the above). 2) Top view 1 A visual capture of the area on the top 2 is possible.

In the conventional configuration, as shown in Fig. 9 with the main parts enlarged, a fan-shaped light guide piece 7 a and a light source 7 with an incident light portion 7 of the light guide piece 7 a are used. And one of the light guide 7 blocks. A plurality of such blocks (for example, six to eight) were combined to make a ring-shaped light-emitting section 5 shown in FIG. Therefore, when assembling the light emitting unit 5, a large number of blocks are combined, and each light source 6 is combined in the narrow space after combination. It must be wired to. That Along with the large number of parts, there was a problem that the man-hours for manufacturing were large. 'Also, using a large number of light sources causes problems such as light leakage and circular light patterns lacking in clarity. What is it?

Also, as shown in FIG. 7, the disc-like portion of the light guide 7 is disposed under the heat and heat coil 4, so it is provided at the bottom of the main body 1. The light guide 7 cuts off the flow of the cooling air sent from the force (not shown) toward the heating coil 4 and the heating coil 4 is fully There was a problem that it was not going to be cooled. Disclosure of invention

The present invention has improved the brightness by reducing the light transmission loss in the light guide, and has improved the light leakage and the light leakage. The purpose is to provide a induction heating system with an improved light emitting unit.

The induction heating system according to the present invention comprises a coil holder for holding a heating coil, and a light guide provided around the heating coil for emitting light. A light source for entering light into the light receiving part of the light guide and a light source storage part for storing the light source are provided. The coil holder and the light source storage unit are integrally formed, and the coil holder is configured to block the light from the light source. Ru According to this configuration, the light reflected by the coil holder enters the wall of the light guide forming the light source storage section, and the light emitted from the light source is emitted from the light source section. The induction heating / heating device according to claim 1 of the present invention, which is capable of strengthening A heating coil for induction heating, a coil holding table for holding the above-mentioned heating coil, and an outer circumference of the heating coil. A light guide, a light source for emitting light to the light receiving portion of the light guide, and a light source storage portion for storing the light source are provided. The coil holder and the light source storage unit are integrally formed, and the coil holder blocks the unwanted dissipation of the light from the light source. It has a light shield. With this configuration, the light reflected by the coil holder enters the wall surface of the light guide forming the light source storage section, and the light emitted from the partial light is transmitted to the wall surface of the light guide. Be strong. In addition, the color and light intensity of the entire light guide can be reduced.

The induction heating heater according to the invention as set forth in claim 2 has the coil holding stand coming out of the outer peripheral cover of the light guide particularly in the configuration according to claim 1. It is configured to block light. By this, the light emission from the side wall of the light guide is suppressed, the radiation from the light emitting surface is increased, and the color loss and the light amount are reduced. it can .

The induction heating system according to the invention as set forth in claim 3 has a substrate on which the light source is placed, particularly in the configuration as set forth in claim 1 or 2. . By forming the substrate with a light shielding member, it is possible to prevent the light from leaking to the outside, and at the same time reduce the color and light intensity of the light. You will be able to

The induction heating system of the invention according to claim 4 has a constitution described in claim 3, in particular, for transmitting light to a part of the substrate and a part of the substrate. It has a reservoir layer. Because of this, the light goes to the outside It is possible to prevent leakage.

The induction heating heater according to the fifth aspect of the present invention has the configuration described in claim 1 or 3 particularly according to claim 1 or 3 from the light source. A light shield cover that shields light is attached to the coil holder. This prevents the light from leaking from the upper part of the light source storage part, so that the amount of light emitted from the light emitting surface is increased, and the color loss and the light amount are increased. It is possible to reduce the amount of waste.

The induction heating conditioner of the invention according to claim 6 has the light receiving part formed by the light shielding cover in the light guide according to the configuration described in claim 5, in particular. It is configured to block the light coming from it. This will prevent the light from leaking from the light receiving part.

The induction heating conditioner according to the invention as set forth in claim 7 has a light diffusion portion in a part of the light entrance portion particularly in the configuration according to claim 6. . As a result, it is possible to intensify the reflection of light incident from the light entrance and to increase the amount of light incident on the light guide facing the light entrance.

The induction heating heater according to the invention as set forth in claim 8 has the structure described in claim 1, in particular, in which the light source is prevented from dissipating unwanted light. There is a light source power cover that covers the side of the light source. By covering the side of the light source with one light source power, the amount of light incident on the light entrance surface of the light guide from the front of the light source can be increased. Brief description of the drawing

Fig. 1 is an exploded perspective view of the main part of the induction heating cooler according to the embodiment of the present invention.

Figure 2 is a plan view of the light emitting part of the induction heating system of the present embodiment.

Figure 3 is a cross-sectional view of I II I I I I in Figure 2.

Fig. 4 is a plan view of the heating coil of the induction heating heater of this embodiment.

Fig. 5 is a plan view showing another example of the light shielding cover used in the power storage section of the induction heating cooker of the present embodiment.

FIG. 6 is a perspective view of an example in which a light shielding cover is provided to the light source of the present embodiment.

Figure 7 is a cross-sectional view of a conventional induction heater.

Figure 8 is a plan view showing an example of the display shape on the top plate.

Figure 9 is a perspective view of the conventional light emitting part. Best form for implementing inventions

Hereinafter, the example of the induction heating cooker according to the present invention will be described with reference to the drawing.

Figure 1 is an exploded perspective view of the main parts of the induction heating cooker of the present invention. Fig. 2 is a plan view of the light emitting part of the induction heating system, and Fig. 3 is a cross-sectional view taken along the lines III-III in Fig. 2. Figure 4 is a plan view of the heating coil 15 of the induction heating heater. The basic configuration of the induction heating cooker in this example is shown in Figure 7 The elements shown in the figure are substantially the same as those in the conventional example, so elements common to both are given the same reference numerals and explanations thereof are omitted. Also, refer to Figure 7 and explain as necessary.

The light emitting unit 55 in the present embodiment will be described with reference to FIGS. 1 to 3. In FIG. 2, the light emitting unit 5 5 is a light source

It is composed of an annular light guide 30 whose cross-section is a quadrilateral of 2 6. As shown in Fig. 3, the light guide 30 is an annular member made of a translucent plastic material having a rectangular cross section. The inner and outer cylindrical surfaces are finished in a mirror-like manner, and the thickness of the space between the inner and outer surfaces, that is, the cylindrical portion, can be uniformly finished. It is preferable for the back light transmission within the annular light guide 30 of the light due to the total reflection action. In order to obtain a clear and distinct ring-like pattern, the plastic material has a low internal light fraction and a high light refractive index. The one is preferable. A light emitting diode is suitable as the light source 2 6. In a part of the outer circumferential cylindrical surface of the light guide 30, a light entrance portion 1 1 for setting the light from the light source 26 into the annular portion is provided. . The light entrance part 1 1 is a curved and light transmitting member. The light entrance part 1 1 has two light entrance faces 1 2 facing each other at a predetermined distance on the outer peripheral face 30 a of the light guide 30, and each light entrance face 1 2 There is an inclined portion 1 1 a whose thickness gradually decreases along the outer circumferential surface 30 0 a. A light source 2 6 attached to a substrate 1 9 is disposed facing the light entrance surface 1 2. The light emitted from the light source 2 6 is incident from the light incident surface 12 of the light incident portion 1 1, and passes through the wedge-shaped light incident portion 1 1 to form a circular ring. It is introduced into the light guide 30 of. In order to increase the transmission efficiency of the introduction, the junction surface between the light-incidence part 11 and the light guide 30 is optically non-reflective or extremely low resistance. I like being in the shooting state. For example, it is also possible to improve transmission efficiency by interposing a medium with an optical refractive index close to that of the optical refractive index between the two. I would like to help you. As shown in FIG. 3, a light reflecting layer such as a metal-deposited film that reflects light directed from the light guide 30 to the bottom 30 b on the bottom 30 b of the light guide 30 is shown. 1 3 has been set up. The light reflected by the light reflection layer 1 3 is a light guide 3

The light is emitted upward from the light emitting surface 14 on the upper side of 0, or emitted into the air. The light emitting surface 14 of Fig. 1 is shown with a hatching, but this is not a cross section but the upper surface is roughened. It indicates that it is being done. The light reflection layer 13 may be coated on the bottom surface 30 b with a non-light-transmissive and high-reflectance paint such as silicone resin. Also, the light reflecting layer 1 3 is provided by a simple method such as forming an adhesive or adhesive tape on the bottom 30 b and forming a concave-convex shape. This is also possible. On the upper surface or top surface of the ring-shaped light guide 30, a method such as forming a small concave / convex on the light emitting surface 14 or forming a large number of shallow grooves etc. Therefore, roughening increases the amount of light emitted from the surface to the outside.

As shown by arrows 40 and 41 in FIG. 2, light incident from the light entrance portion 1 1 of the light guide 30 is transmitted along the light guide 30 as shown by arrows 40 and 41 in FIG. 3. The inner side 14 a and the outer side 14 b of the light guide 30 shown in the cross sectional view are not preferably mirror-finished as described above. Therefore, when light travels along an annular light guide 30, the light travels through total internal reflection between the inner side 14 a and the outer side 14 b. And do not leak from the inner side 14 a and the outer side 14 b to the outside. In the present embodiment, two light sources 26 are provided, and light is incident on the light guide 30 from the two light entrances 11 on the left and right sides. Therefore, the light incident is the light guide 3 0 Go in both directions clockwise and counterclockwise in the middle. The intensity of the light emitted from each part of the annular light emitting surface 14 of the light guide 30 to the outside becomes the opening for the intensity of light traveling in both directions. Because of this, the intensity of light emitted from each part of the light emitting surface 14 to the outer part becomes almost uniform at the entire area around the annular light emitting surface 14.

In the part L near the light incident part 1 1 of the light guide 30 shown in FIG. 2, the light entering from the both light incident parts 1 1 travels around the light guide 30 one round and reaches the end It is a part of However, there is a tendency for the amount of light passing through this part to be small. As a result, the brightness of the ring of light on the top plate facing the part L will be slightly reduced, and it will be easy to make it clear. . In this embodiment, the problem is solved by the configuration described below. In the induction heating system using the light emitting portion 55 of the present invention, the problem is first described. The configuration of the heating coil will be described in detail using the top view of Fig.4. The heating coil 4 is placed on the coil holder 15. The bottom of the heating coil 4 has a large space (not shown) so that the cooling air can directly hit the heating coil 4. In order to block the light from the light guide 30 power ^ in the coil holding table 15, the light shielding 5 a is It is set up. A magnetic leakage prevention ring 1 6 made of a conductive material such as an aluminum for preventing magnetic leakage is provided around the heating coil 4. Yes. A light guide 30 is provided between the magnetic leakage prevention ring 16 and the side wall 15a of the coil holder 15. The light guide 30 is formed. A light source storage unit 17 for storing the light source 2 6 is provided integrally with the coil holder 15.

The first light source storage unit will be explained in detail using Fig. 1 and Fig. 4. In FIG. 1, the light source storage unit 17 is the bottom space between the side wall of the coil holder 15 and the light guide 30. Attach the board 19 with the light source 26 mounted from the lower side so that the light sources 26 and 26 can be inserted into this space, and cover the upper surface with a screw 20 It is fixed together with the vehicle. That is, the light shielding cover 18 and the base plate 19 are attached to the upper and lower sides of the light source storage unit 17 by screws 20 of the fastening means. The light shielding cover 18 prevents the light from the light source 26 from being emitted to the outside from the upper surface, and reflects the light by the light shielding cover 18 and guides the light again. In order to make it enter the light source 30, a means of reflecting light on the lower surface, for example, a coated layer of aluminum foil or a coating that reflects the light is applied. Ru

As another example of the configuration of the light shielding can 18, as shown in FIG. 5, the extension portions 18 a and 18 b as the light shielding portion are covered with a light shielding 'cover 4 as shown in FIG. 5. It is also possible to use a light shielding canopy 4 8 that is set up in 8 to cover the upper surface of the light entrance section 1 1 as well. The light source 1 1 is provided with two light sources 2 6 in the substrate 1 9. The upper surface of the substrate 1 9 is coated with the same metal foil as the lower surface of the light shielding cover 18. There is a means to reflect light such as clothing.

A connector 21 is provided on a substrate 19 in FIG. 1, and the connector 21 is electrically connected to a light source 6 on the substrate 19. When the board 19 is attached to the power supply storage section 17, the connector 21 is set in such a position as to be located at the bottom of the coil holder 15. Ru This makes it easy to connect an external lead wire to connector 2 1.

The operation and technical features of the induction heating system configured as described above are omitted from Fig. 1 and the illustration described below with reference to Fig. 4. When the power is turned on by the operation of the known power supply switch and a current flows to the heating coil 4 (Fig. 4), an induction magnetic field is generated, and the top plate is removed. The object to be heated 3 placed on the ground 2 (see Fig. 7) is heated by electromagnetic induction. At this time, the shielding action of the magnetic leakage prevention ring 1 6 provided on the outer periphery of the heating coil 4 shown in Fig. 4 prevents the magnetic flux from leaking to the side. Ru At the same time as turning on the power, the light source 26 shown in Fig. 1 lights up. Light emitted from a light source (light emitting diode) 2 6 is incident on the light guide 30 from the light incident surface 1 2 of the light incident portion 1 1 provided on the light guide 30. While emitting light in the direction of the axis X from the light emitting surface 14 on the upper side of the light guide 30, the light guide 30 is arranged along the annular light guide 30 while light is emitted in the direction of the axis X Go through. As a result, a ring of light close to the shape of the annular light emitting surface 14 of the light guide 30 appears on the top plate 2. The position of the heating coil 4 is displayed by the ring of light. A magnetic leakage prevention ring 16 is present on the inner circumferential side of the light guide 30, and on the outer circumferential side is the side of the coil holder 15. Since the walls are present, light does not leak from both the inner and outer sides of the light guide 30. Light is emitted efficiently from the light emitting surface14.

The light incident from the light entrance part 1 1 is guided along the circumference of the inside of the light guide 30 while emitting light to the outside from the light emission H 14. The intensity of the light emitted from the light emitting surface 14 slightly decreases with the increase of the power of the light incident portion 1 1 from the light receiving portion 1 1. In particular, the portion L of the light guide 30 (FIG. 2) forming the wall of the light source storage unit 17 (FIG. 2) is guided by the light incident on the light guide 30 from the light entrances 11 on both sides. It is the part that reaches the end through the light 30. As a result, the intensity of the light becomes weak, and the light emitted from the light emitting surface 14 of the part L is also weak, so it may be brighter than other parts. is there .

In the present embodiment, in order to compensate for the decrease in the amount of light emitted from the light emitting surface 14 of the part L, the following configuration is made. As shown in Fig. 1, a light shielding force bar 18 is provided on the top of the light source storage unit 17 and a board 19 is provided on the bottom. The side walls of the coil holder 15 are made of a light shielding member so that the light from the light source 26 is less likely to leak to the outside. Therefore, most of the light emitted from the light source 2 6 and not incident on the light incident part 1 1 repeats reflection within the light source storage part 1 7. And a part enters the light guide 30 from the light entrance part 1 1. The other part of the light enters the light guide 30 from the wall surface 30 a of the light guide 30 which is roughened. As a result, the amount of light near the wall 30a of the light guide 30 constituting the light source storage unit 17 increases. As a result, the light emitting surface near the wall surface 3 0 a 1 4 4 The amount of light emitted from the light source is increased and the light emitting surface 1 4 Welcome to the entrance to the entrance

The light of the light is reduced. With this configuration, it is possible to improve the efficiency of using 2 6 sources of light.

In addition, extending both ends of the light shielding cover 18 shown in FIG. 1 and extending the light shielding cover 48 shown in FIG.

Since the configuration is 8 b, cover the upper surface 1 1 c and 1 1 d of the light portion 1 1 with the extension 8 a and 18 b with the light shielding cover 4 8 And, the ring of light emitted from the light emitting surface 14 becomes a clear ring. Also, a part of the light leaked from the light entrance section 1 1 is incident on the wall surface 30a of the light guide 30 near the light entrance section 1 1 and the emitted light of the light emission surface 14 of the section of the light By strengthening it, it is possible to reduce the brightness of the light emitting surface 1. Furthermore, if a large number of shallow grooves are formed on the upper surface 1 1 c, 1 1 d of the light portion 1 1 by forming a small number of concave and convex portions, the upper surface is made rough. The amount of light emitted to 1 c and 1 1 d increases. When the wall surface 30a of the light guide 30 of the portion L and the opposite inner side surface 30d are roughened, the amount of incident light to the light guide 30 is increased. The amount of light emitted from the light emitting surface 14 of part L increases.

As described above, according to the present embodiment, according to the present embodiment, the ring-shaped light guide 30 may be provided on the outer periphery of the heating coil 4 with a simple configuration. You can display the shape of a small annular light on the surface of the light 2 above.

If the light source storage unit 1 7 can be protected from light leakage by covering it with a light shielding cover 1 8 or 4 8, it will not be a cover, and the light guide 30 Since the light entrance part 1 1 and the light source 2 6 can be seen from the outside power ^, the induction heating heater can be made to have a good appearance. You will be able to study in Japan.

In the present embodiment, the case where an annular member is used as the light guide 30 is described, but the present invention is not limited to this. It is possible to use a light guide of any shape, such as a hexagonal shape. By using a light guide of arbitrary shape, it is possible to display an arbitrary figure by light on the top plate. Further, the cross-sectional shape of the light guide is not limited to the quadrilateral illustrated in FIG. 3 but may be other shapes such as a trapezoidal shape.

In this embodiment, the case where the light source storage unit 17 is integrally formed with the coil holder 15 has been described, but the light source storage unit 17 is separately manufactured, May be installed on the coil holder 15

In the present embodiment, the case where one light source storage portion 17 is provided is described, but the present invention is not limited to this, and the length of the light guide is not limited to this. If you need a lot of light sources, you can set them in multiple places as needed.

In the present embodiment, the case where the light shielding side wall is provided on the coil holder 15 is described, but light leakage from the side of the light guide 30 is permitted. If this is the case, it is not necessary to make the side walls opaque, and it is not necessary to set the side walls as well.

In general, the substrate 19 on which the light source 2 6 is mounted is slightly transparent to light, but in this embodiment, it is preferable that light is not transmitted as described above. Please. Therefore, paint etc. is applied to the translucent substrate and a light shielding part is provided in a part of the substrate so that light can not be transmitted. Also, provide a layer that does not transmit light to substrate 1 9 If light is not transmitted, incident light from the side wall of the light guide increases, and the amount of light emitted from the light emitting surface 14 of that portion increases. This makes it possible to reduce the brightness of the luminous surface 14 further. Since the light leaks to the lower surface of the heat and heat coil unit 15, when the top plate 2 is seen from the upper cover, the leaked light is You may not give your eyes a sense of harm to the user.

As shown in Fig. 6, the light source 26 is provided with a light shielding can 50 so that the light from the light source 26 is not emitted in the direction other than the light incident surface 12. If this is the case, the incident light to the light entrance surface 12 will be strong, which is not good.

As described above, according to the present embodiment, the light source storage unit 17 is shielded so that the radiation of light from the light source 26 can be efficiently used. It is not limited to the above configuration as long as it is a configuration that can achieve this purpose.

According to the present invention, the light emitting surface of the light source is incident from the side surface of the annular light transmitting light guide, and this light is the end surface of the circular ring of the light guide. It is emitted from the outside. The incident light is totally reflected on the side wall of the cylindrical surface of the light guide while passing through the circular light guide, so that the light distribution in the light guide becomes relatively uniform, The amount of light that is emitted from the light emitting surface to the outside is reduced at each part of the annular shape. As a result, it is possible to display an annular light figure that has a relatively uniform brightness. Since the light guide is located around the heating coil and does not block the blowing of the cooling air to the bottom of the heating coil, the light guide affects the cooling of the heating coil. I do not have to give

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Claims

Scope of claims

1. Heating coil for induction heating of the object to be heated,

A coil holder that holds the heating coil,

A light guide provided on the outer circumference of the heating coil, a light source for irradiating light to the light entrance of the light guide,

A light source storage unit for storing the light source is provided, and the coil support and the light source storage unit are integrally formed, and the light from the light source is used for the coil support. An induction heater with a shielding part that blocks the unwanted dissipation of heat.

2. The induction heating conditioner according to claim 1, wherein the coil holder is configured to block light emitted from an outer periphery of the light guide.

3. The induction heating system according to claim 1 or 2, wherein the coil holder comprises a substrate on which a light source is placed, the substrate being constituted by a light shielding member.

4. The induction heating cooker according to claim 3, wherein a layer which does not transmit light is partially provided on at least a part of the substrate.

5. The light source according to any one of claims 1 to 3, wherein a light shielding force to block the light emitted from the light source is attached to the coil holder. Induction heating cooker as described.

6. The induction heating device according to claim 5, wherein the light shielding cover has a light shielding portion that shields light emitted from the light incident portion formed in the light guide. .

7. The induction heating conditioner according to claim 6, wherein at least a part of the light entrance part is provided with a light diffusion part.

8-The induction heating regulator according to claim 1, wherein the light source is provided with a light source cover which covers the light source in order to prevent undesired light dissipation.