Title: Electroacoustic transducer of the flexural vibrating diaphragm type

Abstract: The invention describes a low cost transducer construction utilizing a vibratile diaphragm to form a closure for a cylindrical tubular housing. The sound radiating surface of the diaphragm is of a concave shape to achieve an increased diaphragm thickness at its periphery. The concave diaphragm design permits the precise adjustment of the resonant frequency of large quantities of mass produced transducers by machining the surface of the thick rim portion of the diaphragm. Greater precision in the adjustment of the resonant frequency is achieved with this design because the frequency change is less critically dependent on the amount of material removed than is the case with a conventional flat diaphragm surface as used in prior art designs.

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Inventors: Massa, Frank (Cohasset, MA, US)

Application Number: 483549
Filing Date: 1974-06-27
Publication_date: 1976-03-09
Assignee: Dellorfano, Jr.; Fred M. (Cohasset, MA); Massa; Donald P. (Cohasset, MA)
Primary Class(es): 310/312 310/324, 381/173
Other Classes:
US Patent Ref:

1355600	Oct, 1920	Gans	179/138.
1738322	Dec, 1929	Schlenker	181/173.
1815945	Jul, 1931	Hopkins	179/115.
2910545	Oct, 1959	Glenn	179/110.
3206558	Sep, 1965	Shoot	310/8.
3736632	Jun, 1973	Barrow	310/8.
3876890	Apr, 1975	Brown	310/8.

Other Refs:
Primary Examiner: Budd, Mark O.
Assistant Examiner:
Attorney: