Showing papers on "Bimorph published in 1976"
TL;DR: In this article, a sensor for sensing vibrations in a transducer assembly and for generating an electrical signal indicative of the vibrations is disclosed, which includes a piezoelectric generator which is mounted with a bimorph on a common substrate.
Abstract: A sensor for sensing vibrations in a transducer assembly and for generating an electrical signal indicative of the vibrations is disclosed. The sensor includes a piezoelectric generator which is mounted with a bimorph on a common substrate. The piezoelectric generator and bimorph have a common cantilevered end portion and an opposed deflectable free end portion so that deflection of the free end portion of the bimorph causes a corresponding deflection of the free end portion of the piezoelectric generator, whereby the piezoelectric generator generates an electrical indication of the instantaneous degree of deflection of the bimorph.
43 citations
Patent•
16 Apr 1976
TL;DR: Improved deflection of a bimorph having a pair of electrically poled piezo-ceramic elements bonded to opposite sides of a common substrate is achieved by applying to each element a deflection voltage whose polarity is always in the poling direction of the element to which it is applied.
Abstract: Improved deflection of a bimorph having a pair of electrically poled piezo-ceramic elements bonded to opposite sides of a common substrate is achieved by applying to each element a deflection voltage whose polarity is always in the poling direction of the element to which it is applied. By maintaining the polarity of the deflection voltages in the poling direction of the piezo-ceramic elements, large amplitude deflection voltages can be used without de-polarizing the piezo-ceramic elements.
35 citations
Patent•
19 Mar 1976
TL;DR: A magnetic head supported for scanning along tracks of a magnetic medium is mounted on a piezoelectric bender element for movement laterally relative to the tracks as they are scanned as mentioned in this paper.
Abstract: A magnetic head supported for scanning along tracks of a magnetic medium is mounted on a piezoelectric bender element for movement laterally relative to the tracks as they are scanned As the head scans a track, the relative position between the track to be reproduced and the head is sensed to determine the tracking position of the heads A bias control signal is generated by a servo circuit and applied to energize the piezoelectric bender element to position the head relative to the track to maintain the head in the desired tracking position as it scans the magnetic medium
19 citations
TL;DR: In this paper, a plurality of pairs of bimorph elements are formed by rigidly attaching together two individual lengths of piezoelectric material with each dimensioned to provide a length and width substantially greater than its thickness.
Abstract: An improved transducer for generating and detecting shear waves using pielectric bimorph elements. A plurality of pairs of bimorph elements are formed by rigidly attaching together two individual lengths of piezoelectric material with each dimensioned to provide a length and width substantially greater than its thickness. The plurality of bimorph pairs are mounted in a configuration such that each pair is separated by a layer of high compliance material with the electrical polarization of each piezoelectric element pointing in the same direction. Electrical potential applied simultaneously to the electrodes of the individual pairs causes the entire end face of the transducer to perform a shearing motion which will generate or detect acoustic waves in materials in contact with the face.
14 citations
Patent•
17 Feb 1976TL;DR: In this article, a unique printer head employs a plurality of bimorph benders to drive a wire matrix, having centrally located coupling washers, and a housing supports the benders which are stackably mounted therein such that the washer openings form a central cavity which is aligned with an opening in the housing.
Abstract: A unique printer head employs a plurality of bimorph benders to drive a wire matrix. The benders are of the circular, high power type, having centrally located coupling washers. A housing supports the benders which are stackably mounted therein such that the washer openings form a central cavity which is aligned with an opening in the housing. Each wire couples to a corresponding bender to be ballistically driven thereby. The wires are routed through the central cavity and wire guides for actuation out the housing opening. Because of the high efficiency of the bimorph bender drivers, the improved printer head has reduced size and weight, while maintaining a high reliability.
3 citations
TL;DR: A simple piezoceramic optical beam deflector was constructed in this laboratory for feasibility studies and when the results were compared with those obtained for similar systems by other authors, a significant increase in the deflection sensitivity was noted.
Abstract: A simple piezoceramic optical beam deflector was constructed in this laboratory for feasibility studies. When the results were compared with those obtained for similar systems by other authors, a significant increase in the deflection sensitivity was noted. The configuration and dimensions of the beam deflector are shown in Fig. 1. The bimorph strip is a sandwich configuration consisting of a metal foil approximately 0.1 mm thick to which two PZT elements, about 0.15 mm thick, are bonded. One end of the strip is epoxied into a slot in a large lead block, and a mirror made from a gold-coated 1-cm square microscope cover glass is epoxied to the other end of the strip. The weight of the bimorph strip was 1.955 g and of the mirror 0.036 g. The amount of beam deflection expected for a given applied voltage can be calculated by noting that the PZT elements will expand on one side of the metal foil and contract on the other side by an amount equal to
2 citations