Electric horn with solid state driver

Details Electric horn with solid state driver Electric horn with solid state driver

1991-09-16

1992-11-03

Ng, Jin F.

Communications: electrical

Audible indication

Diaphragm

340384R, G08B 310

Patent

active

051609134

ABSTRACT:
An electric horn having a diaphragm connected to a ferromagnetic plunger is driven by an electromagnetic coil to cause vibrations of the diaphragm at the resonant frequency of the diaphragm and plunger combination. A solid state driver has a timer tuned essentially to the frequency of the diaphragm assembly and controls the driver power output to effect coil energization to drive the diaphragm movement synchronously with the timer frequency. The driver output stage comprises a power MOSFET or a Darlington pair.

REFERENCES:
patent: Re28745 (1976-03-01), Smith
patent: 3846792 (1974-11-01), Haigh
patent: 3872470 (1975-03-01), Hoerz et al.
patent: 4195284 (1980-03-01), Hampshire et al.
patent: 4361952 (1982-12-01), Neese
patent: 4383249 (1983-05-01), Frigo
patent: 4482888 (1984-11-01), Todaka et al.
patent: 4488145 (1984-12-01), Katsuma et al.
patent: 4684927 (1987-08-01), Zofan et al.
patent: 4700177 (1987-10-01), Nakashima et al.
patent: 5049853 (1991-09-01), Yoon

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