Showing papers on "Bimorph published in 1969"

Piezoelectric crystal operated pump to supply fluid pressure to hydrostatically support inner bearings of a gyroscope

Abstract: A piezoelectric crystal operated pump including a bimorph (bender type) piezoelectric crystal diaphragm, volumetrically expanding piezoelectric crystal stack, or such a crystal stack operated diaphragm pump arranged to flex in a pump cavity to supply a fluid pressure medium to hydrostatically supported inner bearings of gyroscope.

High temperature, high vacuum, diffusion bonded piezoelectric motor sandiwch, utilizing intermediate wafflelike layers

Abstract: This invention presents a construction for piezoelectric-type motor devices commonly termed ''''bimorphs'''' and obtains an improved bimorph that is suitable for operation at high temperatures and in high vacuum environments. The bimorph is constructed of two thin flat piezoelectric layers, each of which is plated on the front and back faces with an electrically conductive material by conventional techniques, such as ion plating. This plating preferably consists of successive layers of chrome, copper, and gold. One face of each element functions as an outer electrode. The middle electrode of the bimorph is a thin flat metal which has physical characteristics which match those of the piezoelectric bodies, suitably molybdenum. The molybdenum sheet is copper plated on both sides. This electrode is sandwiched between the two piezoelectric layers. However, sandwiched between each of the piezoelectric layers and the plated middle electrode is a thin layer of electrically conductive material, suitably gold, having a wafflelike or indented lattice surface configuration. These elements are sandwiched together as indicated and are diffusion bonded together to form a unitary mass. One representative application is the use of the bimorph as a driving mechanism in tuners located within the evacuated regions of microwave tubes, such as the coaxial magnetron. Additionally, because the construction retains its operational characteristics in high vacuum environments without outgassing, the motor mechanism is suitable for application in high vacuum electron tubes and in outer space.