Patent ID: 6313401
Filing Date: 2001-11-06
Classification: H01L

Abstract:
A doubly encapsulated actuator/sensor package, comprising:an actuator/sensor having wire leads connected to electrodes of the actuator/sensor;a primary encapsulating material surrounding the actuator/sensor except for the wire leads, which extend through the primary encapsulating material; anda fiber-reinforced composite material surrounding the primary encapsulating material and comprising multiple plies of a fiber-reinforced material applied to the primary encapsulating material at selected ply angles;wherein the fiber-reinforced composite material and the ply angles are selected to provide a desired net coefficient of thermal expansion and a desired stiffness with respect to a selected axis;and wherein the primary and fiber-reinforced composite materials and the fiber-reinforced composite material ply angles are selected to provide a coefficient of thermal expansion of approximately zero;and wherein the selected fiber-reinforced composite material and ply angles also result in a composite structure of relatively low stiffness, to provide desirably high actuator force and sensor signal strength.