Variably sound-absorbing device

Details Variably sound-absorbing device Variably sound-absorbing device

1998-11-25

2000-06-13

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310369, H01L 4108

Patent

active

060753080

ABSTRACT:
A variably sound-absorbing device comprises a piezoelectric material 32 the peripheral portion of which is fixed to a frame 31 or the like, at least one pair of electrodes 34 formed on opposite surfaces of the piezoelectric material, and at least one circuit element 36 through which the electrodes are connected to each other. The piezoelectric material 32 is boardlike and curved, and an electrical characteristic of the circuit element 36 (a circuit showing a negative capacitance for example) is variable. The modulus of elasticity (the real number part of the modulus of elasticity) and the loss factor (the imaginary number part of the modulus of elasticity) of the piezoelectric material are thereby varied and the sound-absorbing characteristic is electrically varied to a considerable extent.

REFERENCES:
patent: 3168623 (1965-02-01), Petermann
patent: 4184094 (1980-01-01), Kopel
patent: 4888991 (1989-12-01), Lew
patent: 5054322 (1991-10-01), Lew
patent: 5414322 (1995-05-01), Kosinski et al.
patent: 5471721 (1995-12-01), Haertling

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