Backlit tactile keyboard with improved tactile and electrical characteristics |
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| 申请号 | EP91311036.7 | 申请日 | 1991-11-28 | 公开(公告)号 | EP0503197A3 | 公开(公告)日 | 1993-05-26 |
| 申请人 | Lucas Duralith Corporation; | 发明人 | Demeo, Gregory B.; | ||||
| 摘要 | Disclosed is a keypad for use with compact and portable cellular telephone systems in which each key is backlit. A partially translucent overlay layer (10) of flexible material includes a raised key (12). Under the key (12), in a preferred embodiment, is an actuation layer (14), which, during operation, is depressed downward by the key (12). Below the actuation layer (14), is a tactile feedback layer (20) including a dome (30) for each key (12), in which, after being depressed to a predetermined degree, the dome (30) inverts causing a conductor (44) located below the dome (30) to short conductive traces (28) on a substrate (24) upon which the keypad is mounted. In a preferred embodiment, the keys are backlit by a light source (40) extending through the substrate (24) upon which the keypad is mounted. The tactile feedback layer includes a structure for reducing pressure on the light source when the tactile layer (20) is in the inverted condition, resulting in a thinner keypad with a brighter backlit key and a longer lift light source. | ||||||
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