JPS6360660B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an antistatic device for a cooking appliance using an electronic control element used in general households.

Structure of conventional example and its problems As shown in FIG. 1, in a conventional antistatic device for a cooker of this type, a circuit board 2 is provided on a main body 1, a control circuit element 3 is further fixed, The circuit board 2 is fixed to the display box 4, and based on information from the control circuit element 3, cooking such as boiling or keeping warm is controlled in detail. In addition, this type of cooker is designed to simplify repair services.
Generally, a front panel 6 is disposed on the front side of the display box 4 and fixed with screws 5, etc., and in order to hide the screws 5,
In order to beautifully finish multicolor printing on the surface, a decorative board 7 made of a metal material is detachably attached to the surface of the front panel 6.

The display box 4 and front panel 6 of this configuration have a complex shape with many holes, walls, claws, bosses, etc., and are made of resin to make them light, cheap, and beautiful. It is common that By the way, the front panel 6 is provided with a hole for a notification element 8, such as a light emitting diode, to notify the presence or absence of electricity or the progress of cooking, and this hole is covered with a hole in the decorative plate 7 on which notification contents are printed. It is always said that

Now, Japan is an environment with large differences in dryness and humidity.
Recently, an increasing number of households are installing carpets indoors. It is well known that when you walk on carpets, etc., static electricity builds up in your body, just like rubbing celluloid with a cloth.

Depending on the conditions, this static electricity can reach tens of thousands of volts, and when a person who has accumulated this static electricity in their body touches the metal decorative board 7, the static charge
escapes into the air through the air, ie discharges.

As is well known from lightning, these discharges are directed toward metal, but control circuit elements 3 are integrated on the back of the decorative board 7, and these elements are naturally connected to current-carrying legs, etc. Contains metal. These elements, such as microcomputer elements, which are normally used with DC from several volts to several tens of volts, malfunction or are destroyed by discharge of tens of thousands of volts. There is an extremely serious problem in that if static electricity accumulated in the human body or the like is discharged to the element, normal cooking or the product will be destroyed, and a structure that solves this problem has been desired.

OBJECTS OF THE INVENTION The present invention solves these serious conventional problems and provides an antistatic device for a cooker that is resistant to static electricity.

Structure of the Invention In order to achieve the above object, the antistatic device for a cooker of the present invention includes a circuit board on which a control circuit element is attached, a non-conductive display plate covering this circuit board,
It is equipped with a metal printing plate attached to the outer surface of the display board and a conductor interposed between the printing plate and the conductive part of the cooker body. It is designed so that it is led to the conductive part of the cooking device main body through it.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 2 to 4, the same members as in the conventional example are given the same reference numerals as in the conventional example, and their explanations will be omitted.

Reference numeral 9 denotes a metal printing plate, which has a plurality of claws 9a that fit into a display plate to be described later. Reference numeral 10 denotes a display plate, which has holes for attaching and detaching the claws 9a of the printing plate 9, and is made of a non-conductive resin material. Reference numeral 11 denotes a display board box made of a resin material, in which a circuit board 2 having a control circuit element 3 is disposed together with the display board 10, and has a mounting hole 11a. 12 has a head between the printing board 9 and the display board 10 and passes through a hole in the display board 10;
This is a conductive screw made of a conductor that passes through the mounting hole 11a of the display board box body 11 and reaches the wall 14, which is a part of the conductive part of the metal cooker main body 13. The display board box body 11 is attached to the cooking device main body 13 with fixing screws 15.
Fixed by

In the above configuration, to explain how to ground the main body of static electricity and prevent malfunction and destruction of the control circuit element 3, the electric charge discharged to the printing board 9 passes through the conductive screws 12 and is grounded to the cooking device main body 13 by the wall 14. On the other hand, the circuit board 2 is covered and shielded by a display board 10 and a display board box body 11 made of a resin material.

Therefore, since static electricity is not discharged to the control circuit element 3, malfunction and destruction of the control circuit element 3 can be prevented.

The head of the conductive screw 12 is sufficiently close to the printing plate 9,
Moreover, it is continuous with the cooking device main body 13. The length of the wall 14 and the tip of the conductive screw 12 is set so that they pass through the mounting hole of the display box 11 and are close enough to each other, but as a result of a discharge experiment, the effect is not good if it is within a few mm. I know something.

Note that the conductive screws 12 do not necessarily need to fix the display board 10 and the display board box 11, and may have any shape as long as they are not made of an insulating material. In short, it is sufficient if there is a conductor between the printing plate 9 and the cooking device main body 13 that promotes discharge.

Effects of the Invention As is clear from the above embodiments, the antistatic device for a cooker according to the present invention particularly includes a conductor made of a metal material between the printing plate and the conductive part of the cooker main body. By installing this, the anti-static properties are significantly improved and it is possible to prevent the cooking device from being destroyed by static electricity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional antistatic device for a cooking device, FIG. 2 is an exploded perspective view of an antistatic device for a cooking device showing an embodiment of the present invention, and FIG. 3 is a sectional view of the same.
FIG. 4 is a partially cutaway sectional view of the cooking device. 2...Circuit board, 3...Control circuit element, 9...
...Printing board, 10... Display board, 12... Conductive screw (conductor).

Claims (1)

[Scope of Claims] 1. A circuit board on which control circuit elements are attached, a non-conductive display board covering this circuit board, a metal printing board attached to the outer surface of this display board, and this printing board. An antistatic device for a cooker, comprising: a conductor interposed in a conductive part of a cooker main body; 2. The conductor is a conductive screw. Claim 1
Anti-static device for cooking appliances as described in section.