Timothy P Sullivan

US Patent:

41840933, Jan 15, 1980

Filed:

Jul 7, 1978

Appl. No.:

5/922620

Inventors:

Timothy D. Sullivan - East Haddam CT

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H01L 4110

US Classification:

310331

Abstract:

A transducer, suitable for sensing acoustic signals underwater, includes a iezoelectric polymer film. The device comprises a rectangular sandwich arrangement with a plastic frame in the center having plastic plates connected on either side and a piezoelectric polymer film on the outside of each plastic plate. The film is arranged so that the most active direction of the polymer lies in the transverse plate direction. Electric wires are connected to opposing surfaces of each piezoelectric polymer film. When the sandwich arrangement is complete an air cavity that is compliant to the stiffness of the plates is created in the center within the plastic frame.

US Patent:

41968956, Apr 8, 1980

Filed:

Jul 21, 1978

Appl. No.:

5/926781

Inventors:

Timothy D. Sullivan - East Haddam CT

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F16F 132

US Classification:

267160

Abstract:

A ring-loaded flexural disc spring acts as an isolation mount in a thin cndrical space in the tail of a longitudinal vibrator type of underwater sound transducer. The ring-loaded spring comprises a thin disc having a raised bearing surface at a specified distance from the perimeter on one side of the disc and a raised bearing surface at the perimeter on the other side of the disc. The spring flexes into a concave shape when a load is applied. The operation of the disc is linear over the entire specified load range.