| 摘要 |
An all-electronic keyboard avoiding mechanical motion of keys, and particularly suitable for digital computer input is described. The keyboard has a matrix of keys located at intersections of columns and rows and electronic oscillations are established in circuits including keys of the keyboard. When an individual key is contacted manually, the change in capacitance detunes the oscillating circuit in the column and row in which the selected key lies. Electronic sensors and decoders note the column and row involved and provide a signal unique to the key touched. In one embodiment a separate oscillator is employed for each line of the matrix, and in another embodiment a single oscillator is employed for the entire matrix. Geometrical arrangements of conductors on individual keys are described with the branches of forked conductors interlaced for capacitive coupling. In one embodiment an additional conductor is sinuously interposed between branches of a pair of forked conductors.
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