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公开(公告)号：US5514843A
公开(公告)日：1996-05-07
申请号：US216716
申请日：1994-03-23
申请人： James A. Wilfong , Dave J. Gilman
发明人： James A. Wilfong , Dave J. Gilman
CPC分类号： H01H23/02 , H01H2231/044 , H01H23/025 , H01H25/041
摘要： A pressure-compensated key switch that actuates when a force is applied to an individual key but does not actuate when a uniform pressure is applied to all of the keys. The pressure-compensated key switch includes at least two keys arranged approximately symmetrically about, and balanced on, a pivot. A switch mechanism actuates when a force that offsets the balance and depresses one of the keys. The uniform pressure applied equally to all the keys will not depress or actuate any of the keys. When an individual key is depressed, a pad made of conductive material contacts and bridges a gap between two electrodes to complete an electrical path. The bridging of the gap is the actuation of the switch mechanism. The pressure-compensated key switch is typically part of a system that includes an electrical device to sense completion of the electrical path. A spring returns the key to its un-depressed position when no depressing force is applied. The keys are covered by a flexible membrane that makes a waterproof seal with a housing. An optional light source may illuminate the keys from below by shining through the keys and flexible membrane. Due to its balanced design the pressure-compensated key switch may be used underwater at depths as great as hundreds of feet without being actuated by the uniform water pressure and may be used at sea level without requiring an excessive force to depress the keys.
摘要翻译： 一个压力补偿的钥匙开关，当一个力被施加到一个单独的钥匙上而不会在对所有的钥匙施加均匀的压力时启动。 压力补偿按键开关包括至少两个键，其大致对称地布置在枢轴上并平衡在其上。 当抵消平衡并按压其中一个键的力时，开关机构致动。 均匀的压力均匀地施加到所有的键上将不会压下或启动任何键。 当单个键被压下时，由导电材料制成的焊盘接触并桥接两个电极之间的间隙以完成电路径。 间隙的桥接是开关机构的致动。 压力补偿的钥匙开关通常是包括用于感测电路径完成的电气装置的系统的一部分。 当没有施加压力时，弹簧将钥匙返回到其未按压位置。 钥匙由柔性隔膜覆盖，与外壳形成防水密封。 可选的光源可以通过照亮键和柔性膜从下方照亮键。 由于其平衡的设计，压力补偿的钥匙开关可以在深度达数百英尺的水下使用，而不受均匀的水压的驱动，并且可以在海平面上使用，而不需要过大的力来压下钥匙。
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