Magnetically snap actuated contact keyboard apparatus |
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| 申请号 | EP86100557.7 | 申请日 | 1986-01-17 | 公开(公告)号 | EP0189132A3 | 公开(公告)日 | 1989-03-22 |
| 申请人 | LEXMARK INTERNATIONAL, INC.; | 发明人 | Bolda, Frank Joseph; McKnight, John Patrick; Sturm, Russell Jackson; | ||||
| 摘要 | A magnetically detented keyboard structure includes a baseplate (1) which may be formed of plastics material or steel, or other material as desired. Steel offers the advantage of electromagnetic radiation shielding, electrical grounding pos- sibilities and high structural integrity, but moulded and/or plated plastics material can offer much the same, with the exception of the same high physical strength. A number of individual locator posts (2) (of which only one appears in the figure) are formed integrally with the baseplate (1) by slitting and stamping in the case of a steel or metallic plate, or by moulding in the case of plastic. The posts (2) are spaced at regular intervals correlated with the desired keybutton spacings and positions in the assembled keyboard. A circuitboard (3) of insulating material such as an epoxy laminate, sheet polyamide or the like, has apertures (4), preferably die cut therein to facilitate registering the circuit card (3) precisely over the locator posts (2) on the baseplate (1). Circuitry (12) in the desired artwork pattern is formed using well known techniques on the surface of the circuitboard (3). A contact (11) which may be spherical as shown, or hemispherical or any other generally convex domed shape, is attached to the circuitry (12) as a contact. Two of these contacts (11) are used for each key actuator position, but only one is shown in the figure, the other lying directly behind it. | ||||||
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