JPS629127A - Heating cooker - Google Patents

Abstract

PURPOSE:To eliminate an earth plate and to improve reliability and working efficiency, by a method wherein the surface sheet of a key board is earthed by the use of elasticity of the surface sheet, and this copes with generation of static electricity. CONSTITUTION:In case a key board 2 is placed on a top mark base 6, an earth tab 1 is brought into a state that it is pushed up from a surface by dint of a barrier 10. Since the earth tab 1 is conversely depressed by an earth lug 8 of a back plate 7, the earth tab 1 is earthed by the earth lug 8 of the back plate 7 through spring properties of the earth tab 7. The number of earth tabs 1 of the key boards is 3, and even if one is broken, the remaining two compensate for the broken one key board. Therefore, compared with a single earth tab, reliability is improved. In case the earth tab is divided, it is imperative to decide size so as to ensure width being wide enough to provide sufficient spring properties.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to surface sheets 1-, matrix pattern sheets,
This invention relates to a heating cooker that is operated using a so-called membrane type keyboard consisting of a base panel and the like.

2. Description of the Related Art In recent years, the proportion of home appliances equipped with microcomputers has increased, and at the same time there has been a demand for further cost reductions. Push buttons are used as a method of inputting instructions to a microcomputer.

There are variable resistors, etc., but as an input method for high-frequency heating devices that are cooking utensils, a flat membrane type keyboard with no protrusions on the surface is common, and its structure is as shown in Figure 6. Usually, a top sheet on which the name of the key is printed, a matrix pattern sheet on which electrodes are printed on a film made of conductive material such as carbon, and a base panel that serves as a substrate made of iron plate or the like are laminated. Because humans operate the keyboard for many minutes, the static electricity that builds up on the human body can discharge onto the keyboard, causing the microcomputer to malfunction depending on the voltage at the time of discharge. Therefore, normally, as shown in FIG. 6, a part of the top sheet of the keyboard 11 is made to protrude, and a conductive surface is made in advance from the entire back surface of the top sheet and a conductive film such as aluminum foil, and is provided as a ground tab 12. As shown in FIG. 7, a grounding plate 13 is used to ground the grounding lug 8 of the back plate 7, which forms the framework of the control panel. This earth plate 13 was brought into contact with a thin conductive film on the back side of the front sheet of the keyboard due to its spring properties.

Problems to be Solved by the Invention However, when assembling a control panel, it is possible to forget to attach this earth plate, and if it is not discovered during inspection in the next process, actual damage may occur due to the relatively low static electricity of 2 to aKV. computer malfunctions,
There was a risk that the product would start moving on its own.

To provide a high-frequency heating device which uses the elasticity of the surface sheet of a keyboard to ground it and prevents static electricity in order to eliminate the conventionally required ground plate.

Effect 1: According to the method of the present invention, a grounding plate for grounding the keyboard of the control panel of the high-frequency heating device is omitted, and reliability is improved.

Workability can be improved.

Embodiment An embodiment of the present invention is shown in FIGS. 1 to 4. FIG. 1 is a back view of the keyboard of the embodiment, in which three earth tabs are provided protruding from one side of the keyboard 2. Second
The figure shows the structure of the keyboard, including the top sheet 3. Matrix pattern sheet 4. Among the components of the pace panel 6, the key point of the present invention is the top sheet 3. Figures 3 and 4 show the configuration of a control panel incorporating a keyboard. When the keyboard 2 is placed on the top mark base 6, the earth tab 1 is pushed up by the barrier 1o above the surface on which the keyboard is located. It has become.

Since the ground lug 8 of the back plate 7 conversely pushes down the ground tab 1 of the keyboard, the ground tab 1 is grounded to the ground lug 8 of the back plate 7 by its own springiness. The ground tab 1 of the keyboard is 3 reeds, even if it is 1
Even if one of the grounding tabs is damaged and the grounding is incomplete, the remaining two will cover it, improving reliability compared to a case where there is only one grounding tab. However, when dividing the ground tab, it is necessary to determine the dimensions to ensure a width that provides sufficient springiness.

Effects of the Invention As described above, according to the present invention, the shape of the surface sheet of the so-called membrane-type keyboard with a flat surface and the shape of the mounting plate are modified, thereby eliminating the need for the ground plate that was previously necessary. It is possible to improve assembly workability and reduce costs.

[Brief explanation of drawings]

Fig. 1 is a back view of the keyboard of a heating cooker according to an embodiment of the present invention, Fig. 2 is a configuration diagram of the same, Fig. 3 is a sectional view of the control panel section, and Fig. 4 is an exploded view of the control panel section. FIG. 5 is a front view of a general heating cooker, FIG. 6 is a back view of a conventional keyboard, and FIG. 7 is an exploded perspective view of the control panel. 1... Earth tab, 2... Keyboard, 3... Surface sheet, 4... Matrix pattern, 5... Mountain... Pace panel. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 5
figure

Claims (1)

[Claims] An operation panel is provided, in which electrodes are printed on a film and bonded together to form a switch, with a conductive surface on the back side of a top sheet on which key names are printed, and this is grounded to the aircraft body. A heating cooker having a grounding structure in which at least two or more protruding parts are provided on the top sheet of the keyboard, and the conductive surface and a metal body are engaged.