Title: Means for improving the electroacoustical properties of a buzzer

Abstract: The electroacoustical properties of an electromechanical vibrating device for producing an audible signal are improved by attenuating undesirable frequencies of the audible signal to produce a predominant frequency and by accentuating the predominant frequency. The improvement includes a planar vibration diaphram comprised of a plastic polymer material, a vibrating striking member positioned to strike the vibration diaphram at its center; a bumper comprised of resilient material interposed between the vibrating striking member and the vibration diaphram, and a resonant chamber in spaced relation to the vibration diaphram having a resonant frequency substantially equal to the predominant frequency.

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Inventors: Sweany, Louis P. (Carmel, IN, US)
Burk, Michael T. (Indianapolis, IN, US)

Application Number: 820551
Filing Date: 1977-08-01
Publication_date: 1979-02-27
Assignee: P. R. Mallory & Co., Inc. (Indianapolis, IN)
Primary Class(es): 340/388.4
Other Classes:
US Patent Ref:

3408645	Oct, 1968	Doggart	340/388.
3517390	Jun, 1970	Whitehead	340/388.
3656156	Apr, 1972	Berns	340/388.

Other Refs:
Primary Examiner: Pitts, Harold I.
Assistant Examiner:
Attorney: Hoffmann, Meyer & Coles