Communications: electrical – Land vehicle alarms or indicators – External signal light system
Patent
1992-08-04
1995-03-14
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
External signal light system
3403846, 3403847, 34038473, 3403961, B60Q 126, G08B 300
Patent
active
053980247
ABSTRACT:
Signal Annunciators are presented that emit short tones upon being triggered by an electrical signal. They are intended primarily as automotive turn signal and emergency light operation indicators and are designed to be connected downstream of the turn signal switch. They comprise oscillating circuitry and piezoelectric discs. In each, capacitors are used to cause a decay in the volume of the tone produced. In the first species, a capacitor is placed in series with the oscillating circuitry. When a signal voltage is applied to the circuit, the capacitor begins to charge, passing current to the oscillator and disc, which emits sound. As the capacitor charges, less and less current is passed, creating a brief tone of decaying volume. The same effect is created in the second species by placing a smaller capacitor in series with the bias current input of the amplifier in the oscillating circuit. The third species resembles the second, but has a signal input separate from its power supply connections which allows for high input impedance. The devices produce consistent, short, pleasant tones regardless of the length of the input signal, without additional circuitry. They are intrinsically simple and contain very few components. A new case design is also presented for circuit board mounting that allows the sound to be emitted in a direction planar to the circuit board.
REFERENCES:
patent: 3815129 (1974-06-01), Sweany
patent: 3879726 (1975-04-01), Sweany
patent: 4139842 (1979-02-01), Fujita et al.
patent: 4195284 (1980-03-01), Hampshire et al.
patent: 4213121 (1980-07-01), Learn et al.
patent: 4328485 (1982-05-01), Potter
patent: 4486742 (1984-12-01), Kudo et al.
patent: 4567806 (1986-02-01), Kodaira
patent: 4594573 (1986-06-01), Yoshino et al.
patent: 4604606 (1986-08-01), Sweany
patent: 4746905 (1988-05-01), Harima et al.
patent: 4980669 (1990-12-01), Knowles
patent: 5181019 (1993-01-01), Gottlieb et al.
Mallory catalog 4-10-03D "Sonalert Electronic Audible Signals" pp. 2-5, Jan. 1991.
LandOfFree
Signal annunciators does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal annunciators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal annunciators will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-715464