JPS6023920A - Thin switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin switch constituted by conductive contact portions formed on a flexible film and facing each other with a separator having an opening in between. In addition, it provides for increased reliability of the switch contacts under temperature changes.

As shown in Fig. 1, a conventional thin switch has a switch display part 1 made of transparent or semi-transparent flexible film, an upper flexible film 2, a contact 3, and an opening facing the contact 3. 4, a lower flexible film and its contacts 7, and a support plate 8, and each component was fixed with an adhesive or a pressure-sensitive adhesive.

With this configuration, the opening bottom part 4 is connected to the upper flexible film 2.
and the second by the separator 5 and the lower flexible film 6.
As shown in the figure, the air sealed inside the opening 4 expands and contracts repeatedly due to changes in temperature and humidity.
If delamination occurs between the openings 4 and 4 as shown in FIG.
The upper flexible film 2 facing the switch was stretched and sagged, causing the contacts 3 and 7 to approach each other, resulting in a short circuit, resulting in a significantly unreliable switch.

The object of the present invention is to solve these problems and provide a thin switch that has high reliability even under changes in temperature and humidity.

The implementation series of the present invention will be described below, but the basic configuration is the same as the conventional one, and the characteristic parts will be explained in detail here.

The present invention indirectly communicates the opening 4 of the separator 5 with the outside world, so that the air inside the opening 4 has the same density as the outside air when the temperature changes. The present invention provides a thin switch that eliminates electrical short circuits caused by delamination and vacuum conditions.

As shown in FIG. 6, the respective openings 4 of the peeling plate 5 are communicated with each other through grooves or slits 9, and the independent openings 4 are communicated with each other. By extending one opening 4aJ: J groove or slit 10 toward the outside world and communicating with the outside world, each opening 4 indirectly communicates with the outside world. Even in the sandwich structure with the flexible film 2 and the lower flexible film 6, there is no bump or dent in the contact area due to temperature changes, and a constant distance between the contacts 3 and 7 can be maintained at all times. Reliability is maintained.

Similarly, as shown in FIG. 6, a through hole unrelated to the contact is provided in the separator 5, and communicates with the other opening 4 through a groove or slit 9. As shown in FIG. 7, when forming a sandwich structure with the upper flexible film 2 and the lower flexible film 6, a similar through hole 12 is provided in the lower flexible film 6 located in the through hole 11, and a rigid support is provided. Board 8
By providing similar through holes 13 in The structure is such that peeling and electrical short circuit between the contacts 3 and 7 will not occur.

That is, in both cases of FIGS. 5 and 6, each opening 4
The air inside is channeled through grooves or slits 9 or through holes 11, 12.
Since the upper flexible film 2 is indirectly connected to the outside world through the wires 1' and 3, there is no expansion or contraction of the upper flexible film 2 due to temperature changes, and the reliability of the switch is significantly improved.

Also, a structure in which through-holes are provided in the lower flexible film and support plate corresponding to the neck opening can be considered, but contact failure may occur due to environments such as water, oil, dust, and dirt, and its reliability against environmental pollution is significant. inferior in quality.

The table below compares the present invention and the conventional example.

The numbers indicate the rate of increase with respect to the initial value.Those with through holes in each opening have a significantly increased resistance value compared to others.

*Temperature: 70°C, humidity: 96% RH or more for 240 hours Sulfur concentration: 2 5 p. p. m The present invention does not have the above problems because the openings are connected internally by grooves or slits, and the grooves or slits or only one through hole communicate indirectly with the outside world, making it extremely reliable and practical. It is of great value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional thin switch, Fig. 21-j is an exploded perspective view of the lower part of the switch, and Fig. 3 tIi. Figure 4 is a cross-sectional view showing the delamination of the contact area of the PJ switch. - Figure 6 is a perspective view of a grooved separator according to an embodiment of the present invention, Figure 7 is a cross-sectional view of a thin switch using the separator of Figure 61. Yes. 1.... surface layer of the switch, 2..." two-part flexible cable/
Pull film, 3... Contact, 4... Opening, 5-
・Separation If plate, e・- Lower flexible 7) ゛Film,
7...Contact point, 8-...Support plate, 9...Groove or slit, 11, 12.13...Through hole. Name of agent: Patent attorney Toshio Nakao? '175>
1 person Figure 1 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In a thin switch configured by disposing conductive contact portions formed on a flexible film and facing each other through an opening in a separator, the openings in the separator are connected by a groove or a slit, and one end of the groove or slit is connected to the thin switch. A thin switch that connects to the outside world and indirectly communicates the contact part with the outside world.