| 摘要 |
A portable information processing unit, such as a personal computer, has a keyboard in which the normal, operating height of key switches is reduced to a more compact, reduced height automatically when a cover of the unit is closed and is automatically reinstated to the normal operating height when the cover is opened. Each key switch has a key top, a base, an actuating mechanism connecting the key top to the base, an elastic member and a switching layer, the elastic member extending through an opening in the base and interconnecting the key top and the switch. Depression of the key top produces movement thereof in a depressing direction and a depression force transferred through the elastic member to the switch, switching same from an off to an on state; upon release of the key top, the elastic member returns the key top to the normal position. A slide plate is positioned between the base and the switch and has an opening therein through which the elastic member extends and is moveable in reciprocating directions between first and second positions corresponding to, and in response to, movement of the cover between closed and open conditions, the slide plate, in the first position corresponding to the closed condition of the cover, causing the actuating mechanism to move the key top in the depressing direction, compressing the elastic member and reducing the height of the key switches.
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