Method for producing a key which is to be actuated by way of a p

Details Method for producing a key which is to be actuated by way of a p Method for producing a key which is to be actuated by way of a p

1975-09-11

1976-08-24

Hall, Carl E.

Metal working

Piezoelectric device making

317262F, H01L 4122

Patent

active

039758087

ABSTRACT:
For the reproduction of a piezoelectric key, metal layers and resistance layers are applied onto a ceramic substrate having a length which is greater than a multiple of the length of the individual keys. The metal layers are then, corresponding to the number of keys, provided with electrodes, and an additional auxiliary electrode is applied to one of the metal layers. After the ceramic member is encased with a thixotropic resin, by immersing, the substrate is polarized by short-circuited electrode pairs and applying a voltage between the short-circuited pairs and the auxiliary electrode. Thereafter, the individual keys are obtained by severing the same from the encased ceramic substrate.

REFERENCES:
patent: 2940035 (1960-06-01), Lefkowitz
patent: 3766615 (1973-10-01), Shimizu

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