Electrical generator or motor structure – Educational or construction units or kits
Patent
1974-05-20
1976-09-21
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
310 91, 340 8FT, 179110A, H01L 4104
Patent
active
039821420
ABSTRACT:
A transducer assembly which generates a cone shaped radiation pattern concentric with a selected axis is formed by a piezoelectric element mounted in a cylindrical resonant cavity defined by a Helmholtz chamber. Circumferentially spaced apart and radially aligned circular apertures are formed in the chamber's cylindrical side wall and an inclined reflecting plate is spaced apart from the apertures a selected distance. The plate extends outwardly from the chamber at an angle of less than 90.degree. to the chamber axis. The cone shaped radiation pattern is produced by generating a plurality of discrete spherical radiation patterns, combining these patterns to form an annular radiation pattern and partially reflecting the annular radiation pattern from an inclined reflection plate extending at an angle to the chamber axis of less than 90.degree. to produce a cone shaped radiation pattern.
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patent: 2005741 (1935-06-01), Hayes
patent: 3243768 (1966-03-01), Roshon, Jr. et al.
patent: 3325779 (1967-06-01), Supernaw et al.
patent: 3703652 (1972-11-01), Noda
patent: 3742442 (1973-06-01), Leyde et al.
patent: 3748637 (1973-07-01), Larson et al.
Budd Mark O.
Sontrix, Inc.
Wymore Max L.
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