Piezoelectric fan

Details Piezoelectric fan Piezoelectric fan

1986-10-08

1988-10-25

Stout, Donald E.

Pumps

Motor driven

Magnetostrictive chamber

417436, 310316, 310321, 310332, F04B 3504

Patent

active

047800623

ABSTRACT:
A piezoelectric fan includes a tuning-fork type vibrator having two sides. A first piezoelectric element is formed on each of the two sides of the vibrator. Further, an exciting electrode is formed on each of these first piezoelectric elements. Also, a feedback electrode is formed on one of the first piezoelectric elements an electrically insulated from the exciting electrode. Furthermore, a blade is attached to the tip of each of the two sides of the vibrator. Then, this piezoelectric fan is driven in a self-exciting fashion by feeding an output from the feedback electrode to the exciting electrode. Also, in this piezoelectric fan, a vibrational node is formed at nearly the middle point of the vibrator at free vibration.

REFERENCES:
patent: 3902365 (1975-09-01), Knauth
patent: 4144790 (1979-03-01), Suchoff
patent: 4178526 (1979-12-01), Nakamura et al.
patent: 4205267 (1980-05-01), Williams
patent: 4472654 (1984-09-01), Nakamura et al.
patent: 4498851 (1985-02-01), Kolm et al.
patent: 4697116 (1987-09-01), Nakamura et al.

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