Keyboard structure for reducing electromagnetic interference |
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| 申请号 | EP96119396 | 申请日 | 1996-12-04 | 公开(公告)号 | EP0779715A3 | 公开(公告)日 | 1998-09-30 |
| 申请人 | NOKIA TECHNOLOGY GMBH; | 发明人 | SIITARI KIMMO; HAAPAKOSKI HANNU; | ||||
| 摘要 | The invention relates to a keyboard structure (13) which is particularly suited to film keyboards and where EMC protection can be realized by structural means, with fewer auxiliary components than in the prior art. A metal bubble (7), which is the switching member of the keys, is permanently coupled to ground, so that it establishes an ESD protection. The row and column conductors (3a - 4d) are coupled to voltage dividers (11, 12), so that a given row and a given column correspond to a given pair of analog voltage values (V 14 , V 16 ). Each pair of values unambiguously corresponds to a certain key. The analog voltage values are converted to digital form in the A/D converters (19, 20) provided in the microprocessor (8) or in a connected auxiliary circuit, such as a bus buffer. |
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