Showing papers on "Piezoelectric sensor published in 1981"
Patent•
05 Jan 1981
TL;DR: In this paper, a piezoelectric generator for converting acoustic energy in a predetermined frequency range to electric energy is described, including means for mounting the bending element in an acoustic energy path.
Abstract: A piezoelectric generator for converting acoustic energy in a predetermined frequency range to electric energy including: a piezoelectric bending element; means for mounting the piezoelectric bending element in an acoustic energy path; tuning means mounted to the piezoelectric bending element to set the resonant frequency of oscillation of the piezoelectric bending element within the predetermined frequency range.
97 citations
Patent•
16 Mar 1981
TL;DR: In this paper, a feedback type piezoelectric transducer, an amplifier, and a phase compensator are used to adjust the phase shift due to the combination of a bias resistance of the amplifier and equivalent capacitance of the transducerer.
Abstract: A piezoelectric audible sound generator having a feedback type piezoelectric transducer, an amplifier, and a phase compensator for adjusting the phase shift due to the combination of a bias resistance of the amplifier and equivalent capacitance of the piezoelectric transducer.
11 citations
Patent•
20 Mar 1981
TL;DR: In this article, a piezoelectric audio generator with feedback, an amplifier and a phase compensator is presented, which adjusts the phase shift on the basis of the combination of an amplifier bias resistor and the equivalent capacitance of the transducer.
Abstract: A piezoelectric audio generator having a piezoelectric transducer with feedback, an amplifier and a phase compensator for adjusting the phase shift on the basis of the combination of an amplifier bias resistor and the equivalent capacitance of the piezoelectric transducer.
4 citations
Patent•
26 Nov 1981
TL;DR: In this article, a piezoelectric acoustic pick-up for stringed instruments consists of a series of sensors, one for each string, placed in a row transversely beneath the strings; these sensors are clamped between lower and upper, metal pressure- transmitting bars, for transmitting the opposite electrical polarities.
Abstract: A piezoelectric acoustic pick-up for stringed instruments consists of a series of piezoelectric sensors, one for each string, placed in a row transversely beneath the strings; these sensors are clamped between lower and upper, metal pressure- transmitting bars, for transmitting the opposite electrical polarities; these bars are firmly and mechanically bonded to the piezoelectric sensors with a layer of adhesive at the contact faces. A single bar is placed beneath the strings and above the upper clamping. The preferred adhesive is an epoxy resin mixt. comprising resin, hardener and opt. accelerator with an addition of a conducting metal powder, esp. a bronze powder, amounting to at least 70 wt.% and uniformly distributed in the mixt. Arrangement avoids the application of soldering temps. which can alter the acoustic properties of the sensors.