JPH1156603A - Rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a heavy current and high voltage circuit by filling an insulating resin material between adjacent conductive metal of a control circuit, drawing a part of conductive metal of a resin sheathing substrate to the outside of insulating resin and using the part for the connection with electrical parts at the outside of the resin sheathing substrate. SOLUTION: An electrical parts 2 is arranged on a resin sheathing substrate 1 in which resin is filled in conductive metal, conductive metal 3 is drawn from the resin sheathing substrate 1 to the outside, and a terminal hardware 5 of a printed circuit board 4 on which other electrical parts are mounted and conductive metal 3 are connected. Thus, conductive metal 3 filled in the resin sheathing substrate 1 can be utilized as it is as a lead wire for connection with electrical parts except the resin sheathing substrate 1. An exclusive connection lead wire can be eliminated in a heavy current circuit, in particular. Insulation can be secured by a heat contraction tube in conductive metal 3 which is drawn to the outside in a part which is required to be electrically insulated, safety can be secured and miniaturization can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the connection of a high voltage / high current circuit of an induction heating device used for a rice cooker.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a rice cooker of this type has a circuit component constituting a control means 44 for supplying electric power to a heating means 43 for heating a pot 42 housed in a main body 41. Is mounted horizontally below the heating means 43 or vertically between the main body 41 and the pot 42 due to the space in the main body 41. Further, a fan motor 46 for cooling is provided when the temperature of the components inside the main body 41 is not guaranteed. On the other hand, on the printed circuit board 45, as shown in FIG. 5, the power supply to the heating means 43 and the capacitor 47 connected between the resistors 47 and 48, which are the circuit components constituting the control means 44 and the AC power supply, is controlled. The switching element 50 and a radiating fin 51 for radiating heat of the switching element 50 are mounted. The printed circuit board 45 uses a printed wiring board made of paper phenol or glass epoxy.

[0003]

However, in the conventional printed wiring board, since the allowable current per unit area of the printed wiring is small, when a large current and a high voltage circuit such as a high frequency inverter circuit is formed, for example. In order to suppress heat generation in the printed wiring portion, the area must be increased. In addition, the distance between adjacent printed wirings must ensure an insulation distance regulated by law according to the applied voltage.

For this reason, the area of the printed wiring board becomes large, and it is difficult to realize a large-current, high-voltage circuit such as a high-frequency inverter or the like, and the connection from the high-frequency inverter to another substrate is also large. There is a problem that an electric wire corresponding to the current is required, a large area is required for a connection land of the electric wire, and a large space for the connector needs to be provided on a substrate even when connecting with a connector. Was.

[0005]

In order to solve the above-mentioned problems, the present invention comprises a pan, a heating coil for inductively heating the pan, and a control circuit for supplying high-frequency power to the heating coil. The control circuit has a resin exterior board in which at least a space between adjacent conductive metals is sealed with an insulating resin material, and a part of the conductive metal is exposed outside the insulating resin. The conductive metal is used for connection to an electric component outside the resin-coated substrate.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 comprises a high-frequency inverter for generating a high-frequency current, a control circuit for controlling the operation of the high-frequency inverter, a heating coil for converting the high-frequency current into a high-frequency magnetic field, and rice cooker. In a rice cooker constituted by a rice cooker for performing, using a metal molded for electrical connection of an electric component, and using a resin exterior substrate in which the metal is sealed with a resin material having an electrical insulating property for connection of the electric component. Also, by taking the metal out of the end surface of the resin-coated substrate and using it for connection to electric components outside the resin-coated substrate, the high-frequency inverter circuit can be reduced in size, and the rice cooker can be made more compact, which facilitates installation. In addition, the portability can be dramatically improved.

According to a second aspect of the present invention, there is provided a resin-encased substrate, wherein the resin material covering the metal portion exposed to the outside of the resin-encased substrate is formed into a housing shape of a connector used for connection with an external lead wire. And other substrates can be easily connected. According to the third aspect of the present invention, the metal component connection lands mounted on the resin exterior board are not fixed by the resin, so that no stress is applied to the soldered portion by the mechanical stress applied to the electric component, so that the electrical connection is prevented. The reliability of the connection part of the component can be improved.

According to a fourth aspect of the present invention, a metal component connection land to be mounted on a resin exterior board is provided with a radial cut in a hole for mounting a component, and when a lead wire of a component is inserted, the lead wire of the lead wire is cut. By preventing dropout,
It is possible to prevent a component from being detached at the time of component mounting and to improve the assemblability of the board.

[0009]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a resin-coated substrate in which a conductive metal is encapsulated with a resin, 2 denotes an electric component disposed on the resin-coated substrate, 3 denotes a conductive metal drawn from the resin-coated substrate to the outside, and 4 denotes other electric components. Printed wiring board,
Reference numeral 5 denotes a terminal fitting for connecting the printed wiring board and the conductive metal.

As shown in FIG. 1, the conductive metal 3 is formed in accordance with the electric parts 2 to be arranged, and plays the same role as the printed wiring of a conventional printed wiring board. Further, a part of the conductive metal 3 sealed in the resin exterior board is drawn out of the resin exterior board, and can be connected to other electric connection parts, for example, the terminal fitting 5 and the like on the conductive metal by screws. It has become.

[0011] With this configuration, the conductive metal sealed in the resin-coated board can be used as it is as a lead wire for connection to electric components other than the resin-coated board. Lead wires can be eliminated. In addition, insulation can be ensured by a heat-shrinkable tube or the like for the conductive metal drawn out to the outside where electrical insulation is required, so that safety can be ensured and downsizing can be realized.

When this configuration is used in a high-frequency inverter circuit of an induction heating rice cooker, the large current and high voltage circuit portion of the high-frequency inverter can be made much smaller than when a conventional printed circuit board is used. . In addition, since the heat generation of the wiring part is also suppressed, the loss can be suppressed,
If cooling is required, the cooling configuration can be simplified. In addition, since the conductive metal is covered with the resin, it is possible to shorten the insulation distance from other components.

As a result, the size of the high-frequency inverter circuit can be reduced, the size of the rice cooker can be reduced, and the installability and portability can be greatly improved. (Embodiment 2) A second embodiment of the present invention will be described with reference to FIG. In FIG. 2, reference numeral 6 denotes a connector housing molded of a resin-encapsulated substrate with a sealing resin, 7 denotes a connector for connecting lead wires, and 8 denotes a lead wire connected to the connector.

Conventionally, a connector for connecting a lead wire is a component mounted at the time of assembling the board. When the resin outer board 1 is formed of resin, the housing shape of the connector is simultaneously formed and pulled out from the resin outer board 1. By making it possible to connect to the conductive metal 3 with the connector 7, the mounting of the connector at the time of assembling the board can be eliminated. With this configuration,
The man-hours required for mounting the connector during board assembly can be reduced.
In addition, the shape of the housing and the direction of pulling out the connector can be freely designed, increasing the degree of freedom of design such as the mounting direction of the board, realizing miniaturization and cost reduction when used for rice cookers. It is possible to do.

(Embodiment 3) A third embodiment of the present invention will be described with reference to FIG. In FIG. 3, reference numeral 9 denotes a through hole formed at a mounting position of an electric component on the resin-coated substrate, 10 denotes a mounting hole provided on a conductive metal for inserting a lead of the electric component, and 11 denotes a sealing hole in the resin-coated substrate. Conductive metal.

When mounting an electric component on a resin exterior board,
In general, a lead wire of a component is inserted into the mounting hole 10 formed in the conductive metal and soldering is performed. However, when thermal stress or mechanical stress is applied to the electrical component after the soldering, the lead is removed. In the worst case, an excessive force may be applied to the soldered portion of the above, causing the soldered portion to crack.

However, by providing a through hole 9 in the resin exterior substrate 1 around the soldered portion of the conductive metal as in the present invention, the soldered conductive metal can be extended in the direction in which the electrical components of the lead wire extend. It is possible to move freely to some extent, and it is possible to prevent an excessive stress from being applied to the soldering portion even when stress is applied to the electric component.

With this configuration, the soldering strength after mounting the electric components can be increased, and a highly reliable rice cooker can be provided. (Embodiment 4) A fourth embodiment of the present invention will be described with reference to FIG. In FIG. 4, reference numeral 12 denotes a cut radially cut into a component mounting hole made of a conductive metal, 13 denotes a component mounting land of a resin exterior board, and 14 denotes a lead wire of an electric component.

When the diameter of the mounting hole 10 for the electric component is made smaller than the diameter of the lead wire 14 and the lead is inserted into the mounting hole 10, the cut 12 provided in the land becomes the shape shown in FIG.
The conductive metal 11 is deformed at the cut portion as shown in FIG.
It becomes a structure that bites into the lead wire. Conventionally, when an electric component is inserted, it has been necessary to perform a bending process or to fix the component with an adhesive after insertion of the lead wire to prevent the lead wire from coming off. However, since the deformed conductive metal 11 bites into the lead wire 14 according to the configuration of the present invention, it is possible to provide the effect of preventing the lead wire from coming off simultaneously with the insertion of the lead wire.

In addition, not only disconnection prevention but also electrical connection can be made possible, and soldering after mounting electric components can be eliminated. According to the configuration of the present invention, the number of steps for assembling a substrate and the cost for assembling can be reduced, and an inexpensive rice cooker can be provided.

[0021]

As described above, according to the first aspect of the present invention, electrical insulation is ensured by the resin between the adjacent conductive metals, and the distance between the adjacent conductive metals is smaller than that of the printed wiring board. Can be smaller. In addition, the conductive metal encapsulated in the resin-coated board can be used as it is as lead wires for connection to electrical components other than the resin-coated board. This makes it possible to reduce the size of the high-frequency inverter circuit and the size of the rice cooker.

According to the second aspect of the present invention, since the housing of the connector is formed at the same time when the resin-coated board is formed, the number of steps required for mounting the connector at the time of assembling the board can be reduced. In addition, the shape of the housing and the direction in which the connector is drawn out can be freely designed, so that the degree of freedom in designing the mounting direction of the board can be increased, and it is possible to reduce the size and cost of the rice cooker. Become.

According to the third aspect of the present invention, since the component mounting land is not fixed with resin, mechanical stress applied to a soldered portion can be reduced, and a highly reliable substrate can be realized. it can. Claim 4
According to the invention described above, by providing the cut in the component mounting land, it is possible to eliminate the bending process of the lead wire and the fixing by the adhesive at the time of component mounting, and it is possible to reduce the number of assembly steps.

[Brief description of the drawings]

FIG. 1 is a schematic view of a resin-clad board of a rice cooker according to a first embodiment of the present invention.

FIG. 2 is a schematic view of a resin-clad board of a rice cooker according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a resin-clad board of a rice cooker according to a third embodiment of the present invention.

FIG. 4 is a schematic view of a resin-clad board of a rice cooker according to a fourth embodiment of the present invention.

FIG. 5 is a schematic view showing a printed circuit board of a rice cooker of a conventional example.

FIG. 6 is a cutaway sectional view showing the rice cooker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin exterior board 2 Electric component 3 Conductive metal pulled out of resin exterior board 4 Printed wiring board 5 Terminal fitting 6 Connector housing 7 Connector 8 Connection wire 9 Land through hole 10 Component mounting hole 11 Resin-sealed conductivity Metal 12 Notch of land 13 Component mounting land 14 Component lead wire 41 Rice cooker main body 42 Pot 43 Heating means 44 Control means 45 Printed circuit board 46 Fan motor 47 Resistance 48 Resistance 49 Capacitor 50 Switching element 51 Cooling fin

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Goichi Masumoto 1-400 Umeda, Kita-ku, Osaka City Inside Excel Techno Co., Ltd.

Claims (4)

[Claims] 1. A pan, a heating coil for inductively heating the pan, and a control circuit for supplying high-frequency power to the heating coil, the control circuit comprising an insulating resin material at least between adjacent conductive metals. And has a resin exterior substrate in which a part of the conductive metal is exposed to the outside of the insulating resin, and the conductive metal exposed to the outside of the resin exterior substrate is in contact with electric components outside the resin exterior substrate. A rice cooker characterized by being used for connection. 2. The rice cooker according to claim 1, wherein the resin exterior board is made of an insulating resin material and has a housing shape of a connector used for connection to an external lead wire. 3. The rice cooker according to claim 1, wherein the resin exterior board does not have resin fixing of the connection lands so that stress is not applied to a soldered portion by mechanical stress applied to the electric component. 4. The resin-coated board is provided with radial cuts in holes for mounting components on connection lands to prevent the lead wires from coming off when the lead wires of the component are inserted. Rice cooker.