Signal lamp apparatus with a lamp burnout detecting circuit

Details Signal lamp apparatus with a lamp burnout detecting circuit Signal lamp apparatus with a lamp burnout detecting circuit

1980-04-14

1982-09-14

Robinson, Thomas A.

Communications: electrical

Selective

Having indication or alarm

340 81R, 340 73, 340331, 340642, 315200A, B60Q 138, G08B 2100

Patent

active

043498108

ABSTRACT:
A signal lamp apparatus with a lamp burnout detecting circuit has a right turn signal lamp group and a left turn signal lamp group which are connected to a power source through a turn signal switch and a relay contact coupled in parallel with a burnout detecting resistor. Each of the lamp groups includes a plurality of signal lamps connected in parallel with one another. The apparatus includes a comparator which produces an output signal when the voltage across the signal lamp group is higher than a predetermined voltage, and a device which produces a burnout signal when the comparator has an output signal after lights-out, for example, after 20 to 100 m sec since the relay contact is opened. With such an arrangement, the burnout of the signal lamp or lamps may be detected while the signal light lamp group is flashing.

REFERENCES:
patent: 3408625 (1968-10-01), Skinner
patent: 4150359 (1979-04-01), Mizuno et al.

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