| 摘要 |
The invention relates to a keyboard with membrane key switches comprising a sheet with a lower circuit 12, a sheet with an upper circuit 22, a first spacing sheet 18 placed between the two abovementioned sheets and comprising several apertures 20, a second spacing sheet 28 placed on the sheet with the upper circuit 22 and including several apertures 30, a covering sheet 34 placed on the second spacing sheet 28 and including windows 38 aligned with the apertures 30 of the second spacing sheet and removable elements 32 placed in the apertures 30 of the second spacing sheet 28 and bearing symbols aligned with the windows 38 of the covering sheet 34. <IMAGE>
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