- Patent JPS4713059

Document Type and Number:

Japanese Patent JPS4713059

Kind Code:

A

Abstract:

In a keyboard, an elastic diaphragm switch array providing mechanical strobe and rollover protection, and/or a serial signal output. The switch includes a diaphragm, a separator, and a switch card. The diaphragm comprises a gold-plated continuous sheet of thin spring material and serves as a ground or voltage plane or voltage adder. The switch card has a conductive switch array (or pie section pattern) at each key location and may have twice as many pie sections as there are bits in the code to be produced or voltage transitions desired in the output, with additional service pie sections as desired. Each pie section is wired directly by double-sided wiring and through-holes in the switch card to the appropriate output code pin, a positive or negative voltage source, or other connection. A key button and distributor is provided for pressing the diaphragm smoothly through the separator to make contact with the corresponding switch card pie section. In each pie pattern, at least one of the pie sections is offset from the center of contact of the key button such that, as the key button is actuated and the diaphragm pressed through the separator, that pie section makes contact at a different point in time to provide a serial code signal output, or provide such service functions as strobe, rollover protection, switch battery power, or the like.

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