Electrical generator or motor structure – Educational or construction units or kits
Patent
1975-03-20
1977-02-01
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
H01L 4108
Patent
active
040063712
ABSTRACT:
An electroacoustical transducer element comprises a piezoelectric disc flatwise bonded to a metal diaphragm, the bond being at the plane of neutral stress. The transducer element defines the front wall of a sealed chamber that serves as an infinite baffle. In front of the element is a resonant acoustical cavity that matches impedance of the element to that of the ambient medium and comprises concentric axially short large and small diameter cylindrical chamber portions, the small diameter portion providing a front outlet from the large diameter one.
REFERENCES:
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patent: 3331970 (1967-07-01), Dundon et al.
patent: 3651286 (1972-03-01), Gorike et al.
patent: 3700938 (1972-10-01), Bryant
patent: 3708702 (1973-01-01), Brunnert et al.
patent: 3746898 (1973-07-01), Austin et al.
patent: 3749854 (1973-07-01), Mifune et al.
patent: 3819879 (1974-06-01), Baechtold
patent: 3860838 (1975-01-01), Kumon
patent: 3872470 (1975-03-01), Hoerz et al.
McGraw Hill Dictionary of Technical & Scientific Terms, p. 678.
Budd Mark O.
Whitewater Electronics, Inc.
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