Vehicular turn signal indicator system and flasher circuit...

Details Vehicular turn signal indicator system and flasher circuit... Vehicular turn signal indicator system and flasher circuit...

2005-08-09

2005-08-09

Swarthout, Brent A. (Department: 2636)

Communications: electrical

Land vehicle alarms or indicators

External signal light system

C340S458000, C315S077000, C362S545000

Reexamination Certificate

active

06927683

ABSTRACT:
A flasher circuit included in a vehicular turn signal indicator system has a flashing control circuit, a flashing relay, a current detecting resistor, and a switching circuit. The control circuit detects a voltage drop across the resistor during driving of light bulb indicator lamps and light emitting diode (LED) indicator lamps of the system. Each LED lamp is configured to output a disconnection signal if at least one of their LEDs is disconnected during the driving. The signal turns on a transistor of a switching circuit, resulting in short across the resistor. As a result, the voltage drop is lowered equal to or under the threshold value, and the control circuit starts the disconnection detection.

REFERENCES:
patent: 4910496 (1990-03-01), Hatanaka et al.
patent: 5374920 (1994-12-01), Evens
patent: 5872511 (1999-02-01), Ohkuma
patent: 5929569 (1999-07-01), Sueoka
patent: 6031451 (2000-02-01), Graves et al.
patent: 6243009 (2001-06-01), Fritz et al.
patent: 6844681 (2005-01-01), Serizawa et al.
patent: A-2001-244087 (2001-09-01), None
patent: A-2002-362220 (2002-12-01), None

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