| 摘要 |
Non-contact electrical keyboard switch (10) apparatus which is immune to effects of cross-talk and unaffected by the presence of any EMI radiation. The apparatus includes at least one heat source, preferably IR (24). The heat energy from the heat source (24) is directed onto a selected pyroelectric polymeric film (30) which generates a coded or uncoded signal in response to the heat energy applied to the film when a key (14) is depressed. Means (26) are described for directing the heat energy from the heat source (24) to selected pyroelectric films (30). |
