Title: Method for producing a key which is to be actuated by way of a pressure force directioned and dimensioned in a certain manner

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.

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Inventors: Stangl, Franz (Frauental, OE)

Application Number: 612573
Filing Date: 1975-09-11
Publication_date: 1976-08-24
Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DT)
Primary Class(es): 29/25.35 361/233
Other Classes:
US Patent Ref:

2940035	Jun, 1960	Lefkowitz	317/262.
3766615	Oct, 1973	Shimizu	29/25.

Other Refs:
Primary Examiner: Hall, Carl E.
Assistant Examiner:
Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson