Momentary digital encoding device for keyboards |
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| 申请号 | EP83106373 | 申请日 | 1983-06-30 | 公开(公告)号 | EP0098531A3 | 公开(公告)日 | 1984-03-21 |
| 申请人 | ENGINEERING RESEARCH APPLICATIONS, INC.; | 发明人 | Rooney, Craig E.; | ||||
| 摘要 | An improved, low cost, high speed keyboard encoding device is provided which develops directly encoded, valid and reliable multi-bit output signals and overcomes problems associated with tolerance errors and adverse environmental and usage conditions (e.g., manufacturing errors, dust, wear). The preferred encoding device includes a plurality of juxtaposed, flexible conductive strands or wires each having a number of axially spaced impact zones along the length thereof which are either insulated or electrically conductive; corresponding zones on the separate wires are operably aligned to cooperatively define a series of spaced impact zone sets each made up of a unique pattern of conductive and insulated zones. An electrically conductive, rubber-like resilient pad having a series of ridge-like elongated members respectively aligned with corre- s pon d ing impact zone sets is also provided which is designed for impact-shifting of the members into momentary contact with the associated zone sets, whereby electrical contact is made between the ridge members and the conductive impact zones of the set. The resulting circuit making and current flow directly generates a momentary, unique, digitalized output signal without the need for conventional encoding electronic circuitry. The device is particularly suited for use in an impact-type keyboard where, upon depression of each key, an associated resilient element is shifted, released, and allowed to overtravel its rest position and momentarily strike the encoding device at a location for shifting the appropriate pad ridge into contact with the adjacent impact zone set. | ||||||
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