Electrical generator or motor structure – Educational or construction units or kits
Patent
1974-09-17
1976-01-27
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
310 83, 310 91, 340365A, 200181, H01L 4104
Patent
active
039354857
ABSTRACT:
A key board switch comprising a multi-piezoelectric polymer film element A having, in the surface of the polymer film, a plurality of piezoelectric unit elements satisfying the following criteria: (a) the unit elements have electrodes on both surfaces thereof, (b) the portions of the polymer film of the piezoelectric unit elements held between the electrodes on both surfaces have piezoelectric properties and (c) any two piezoelectric unit elements are electrically independent of each other at least with respect to electrodes on one of the surfaces; and a substrate sheet B on which the polymer film element A is laid over and having windows or recesses in the positions corresponding to each of the piezoelectric unit elements of the polymer film element A. The key board switch is adapted so that those portions of the polymer film between each of the piezoelectric unit elements in the element A are secured to the substrate B at intermediate positions between the windows or recesses in the substrate B, whereby the stress applied to one of the piezoelectric unit elements is not transmitted to other adjacent elements so that the changes in the electric field generated from each of the piezoelectric unit elements can be an independent output.
REFERENCES:
patent: 3240885 (1966-03-01), Grunfelder et al.
patent: 3303290 (1967-02-01), Suloway
patent: 3382338 (1968-05-01), Arseneault et al.
patent: 3503031 (1970-03-01), Nyhus et al.
patent: 3648279 (1972-03-01), Watson
patent: 3798473 (1974-03-01), Murayama
patent: 3832580 (1974-08-01), Yamamuro
Obara Hiroshi
Segawa Masahiro
Yoshida Masafumi
Budd Mark O.
Kureha Kagaku Kogyo Kabushiki Kaisha
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