초록 ▼

An electroacoustic transducer especially for use in intrusion alarm systems and comprising a metal diaphragm having a thickness-poled piezoelectric ceramic disk bonded to the center thereof and having an electrode surface in contact with the metal diaphragm. An integral tab outwardly extends from th

An electroacoustic transducer especially for use in intrusion alarm systems and comprising a metal diaphragm having a thickness-poled piezoelectric ceramic disk bonded to the center thereof and having an electrode surface in contact with the metal diaphragm. An integral tab outwardly extends from the diaphragm to provide one electrical terminal, while the other electrical terminal is provided by a flexible electrical ribbon connection to the other electrode of the ceramic disk. An acoustically massive clamp ring attached to the periphery of the diaphragm defines the area of vibration. The vibrating assembly is mounted within a plastic housing having a chamber configured and dimensioned to improve the electroacoustic performance of the transducer structure. Various pattern directors can be employed with the transducer to achieve shaping of the pattern.

대표청구항 ▼

An electroacoustic transducer comprising: a housing having a chamber therein and an aperture; a vibrating assembly mounted in the chamber of said housing and including: a metal diaphragm confronting the aperture; a piezoelectric element engaging one surface of the diaphragm; and an acoustically-mass

An electroacoustic transducer comprising: a housing having a chamber therein and an aperture; a vibrating assembly mounted in the chamber of said housing and including: a metal diaphragm confronting the aperture; a piezoelectric element engaging one surface of the diaphragm; and an acoustically-massive clamp ring engaging the periphery of the diaphragm; first and second electrical terminals connected to said piezoelectric element; and an acoustic leakage path within the chamber between the back of the diaphragm and the front of the diaphragm and allowing a controlled portion of backward radiation from the back surface of the diaphragm to leak around the periphery of the vibrating assembly to said aperture at a controlled phase with respect to the forward radiation from the front surface of the diaphragm to modify the directional characteristics of the transducer.