| 摘要 |
The disclosure describes a keyboard switch having two magnetic cores and a plurality of permanent magnets. The permanent magnets are mounted on a keystem and are movable with respect to the cores to change the flux density in the cores and thus vary the coupling between an AC drive winding and one or more secondary output windings threading each core. Non-magnetic regions separate the permanent magnets and these regions are positioned such that flux changes in one core, resulting from movement of the keystem, are out of phase with the flux changes in the second core. The output signal from one core may be used to strobe or sample the output signals appearing on the secondary windings of the other core. When a plurality of the switches are incorporated in a keyboard, the switches possess an inherent "roll-over" capability. The disclosure also describes a keyboard circuit employing a plurality of the switches.
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