| 摘要 |
A double contact switch is provided to improve second pressing feeling by pressing a lower large metal dome secondly after pressing an upper small metal dome firstly. A base substrate(80) is made of non-conductor. A central contact part(81) and a pattern part are segmented by a segment space part. The circumference of the lower metal dome(70) is contacted with the pattern part. The center of the lower metal dome is protruded from the upper part of the central contact part with an upper protrusion dome shape. The lower part metal dome is electrically contacted with the central contact part by the pressurization. An upper plate(40) is positioned on a base substrate. A penetration hole is formed in the center of the upper substrate. The contact pattern part is formed in the upper circumference of the penetration hole. An upper metal dome(30) is formed in the upper surface of the upper substrate. The center of the upper metal dome is protruded to the convex dome shape. The upper metal dome is electrically contacted with the lower part metal dome by pressurization. An insulating film(10) covers the upper metal dome. Insulation adhesive members(20,50) are interposed between the upper substrate and the base substrate and between the insulating film and the upper substrate.
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