Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1980-10-10
1983-09-20
Wityshyn, Michael G.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
29 2535, 1562744, 1562748, 1562757, 1563082, 156311, 310800, B32B 3120, H01G 702, H01L 4122
Patent
active
044054025
ABSTRACT:
Piezoelectric and pyroelectric elements made from polarized plastics substances such as polyvinylidene fluoride are of considerable interest in a number of fields. Unfortunately, they also suffer from a number of not insignificant drawbacks. Specifically, the maximum thickness of fully-polarized plastics film obtainable is often not sufficient to give the desired sensitivity.
A very satisfactory thick piezoelectric/pyroelectric element can, however, be made from these plastics films if, instead of using a single film which is itself thick, there is used a laminar stack of individually thin polarizable plastics films each such film being essentially in face-to-face contact with its two neighbors, and there being no significant gas space/pockets between any two adjacent films, the element being made by a method in which: the required number of films of the unpolarized but polarizable plastics substance is assembled together in the form of a multilayer sandwich adjacent individual films of which are essentially in face-to-face contact; the assembly is heated to a temperature somewhat below the deflection temperature of the plastics substance; while still hot, a polarizing electric field is applied across the assembly, from end face to end face; and while still applying the polarizing field, the assembly is allowed to cool down.
REFERENCES:
patent: 3458915 (1969-08-01), Miller et al.
patent: 3610969 (1971-10-01), Clawson et al.
Research Disclosure by London Transport Executive, (Nov. 1979), No. 18715, pp. 627-628.
The Marconi Company Limited
Wityshyn Michael G.
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