Control apparatus for vehicle directional lamps

Details Control apparatus for vehicle directional lamps Control apparatus for vehicle directional lamps

1977-10-25

1980-06-10

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340 81R, 340642, 315200A, B60Q 138, G08B 538, G08B 2100

Patent

active

042075530

ABSTRACT:
A control apparatus for use in the direction indicating system of a vehicle having a group of front, rear and side directional lamps. The control apparatus includes a capacitor which is charged and discharged alternately and a comparator which reverses the charging and discharging of the capacitor by comparing the voltage across the capacitor with a reference voltage so that the directional lamps flash periodically. The reference voltage is changed from one to another value upon disconnection of the side directional lamp and further changed from one to the other value upon disconnection of the front or rear directional lamp, thus increasing the flashing frequency of the directional lamps upon each disconnection. The capacitor is charged and discharged by respective constant currents to decrease frequency fluctuation at each flashing frequency of the directional lamps.

REFERENCES:
patent: 3329868 (1967-07-01), Domann et al.
patent: 3421157 (1969-01-01), Atkins
patent: 3523238 (1970-08-01), Jones
patent: 3559198 (1971-01-01), Moreines
patent: 3665207 (1972-05-01), Sieber
patent: 3781841 (1973-12-01), Hughes
patent: 3858177 (1974-12-01), Kugelmann et al.
patent: 3898513 (1975-08-01), Kopernik et al.
patent: 4150359 (1979-04-01), Mizuno et al.

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