| 摘要 |
17 A key input device comprises a dome sheet 7 provided over a base plate 5 and having a plurality of dome portions, and a plurality of manual keys disposed above the dome sheet 7. 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 15 with a pivotal pin 15a, and the dome sheet 7 has a flat sheet portion 70 formed around the dome portions and comprising an inner region 74 extending inwardly of dome portions 72 to be selectively depressed by a seesaw key 15, and an outer region 73 extending outwardly of the dome portion 72. A spacer sheet 6 is interposed between the base plate 5 and the dome sheet 7 to thereby position the inner region 74 of the flat sheet portion 70 of the dome sheet 7 at a lower level than the outer region 73. The seesaw key 15 pivotally moves about the contact portion of the pivotal pin 15a and the inner region 74, whereby one of the dome portions 72 is depressed.
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