| 摘要 |
PROBLEM TO BE SOLVED: To provide an excellently durable switch causing no erroneous action and less fluctuation in action force by forming a spacer into a film type one having through holes at a specific opening rate and setting an action force, by which a switch is operated when a round rod having a hemispherical tip with a specific radius of curvature presses a membrane switch, to a specific value. SOLUTION: A opening rate of through holes 5 is 50% or more, a radius of curvature of a round rod tip part is 5 mm, while an action force for operating a switch is 0.03-0.2 kg and 0.05-0.15 kg desirably. A thickness of a spacer is 20-150μm, while a dimension of each through hole 5 in the spacer 1 is 2-10 mm square and is 2.5-8 mm square desirably. A copper foil plate 2 is bonded by thermo-compression bonding to a base material film 3 formed by applying a hot melt adhesive 6 to a PET film to form, a base board. A sheet formed by perforating grid-shape through holes 5 in a PET film is put between the base boards as a spacer, and the adhesive 4 is arranged in the circumference of the spacer 1 for thermo-compression bonding.
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