| 摘要 |
A key input device including a dome sheet provided over a base plate and having a plurality of dome portions, and a plurality of manual keys disposed above the dome sheet. Each of the dome portions is elastically restorably inverted by being depressed by the corresponding manual key to close contacts. The plurality of the manual keys described include a seesaw key with a pivotal pin, and the dome sheet has a flat sheet portion formed around the dome portions and includes an inner region extending inwardly of dome portions to be selectively depressed by a seesaw key, and an outer region extending outwardly of the dome portion. A spacer sheet is interposed between the base plate and the dome sheet to thereby position the inner region of the flat sheet portion of the dome sheet at a lower level than the outer region. The seesaw key pivotally moves about the contact portion of the pivotal pin and the inner region, whereby one of the dome portions is depressed.
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