Delay circuit for interior illumination means of a motor vehicle

Details Delay circuit for interior illumination means of a motor vehicle Delay circuit for interior illumination means of a motor vehicle

1980-08-14

1983-05-24

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Pulse storing systems of the gaseous discharge-tube type

307 10LS, 315 77, B60Q 700

Patent

active

043852580

ABSTRACT:
A delay circuit for the interior light of a motor vehicle and adapted to be actuated by a vehicle door contacts connected in series with the interior light is disclosed. The circuit has an R.C. network for determining a time delay between opening the door contacts and extinguishing the interior light, an electronic switching amplifier arranged to be connected in series with the interior light and arranged to be switched by the R.C. network, a discriminator stage having a threshold voltage and through which the electronic switching amplifier is arranged to be switched by the R-C network, elements to connect the R-C network and the electronic amplifier in parallel with the door contacts, and elements to provide a residual voltage which is applied across the electronic switching amplifier on opening the door contacts and which charge the capacitor of the R-C network. The residual voltage is greater than the threshold voltage of the discriminator stage and is so low that a voltage difference between the voltage of a source of electricity and the residual voltage is sufficient to operate the interior light.

REFERENCES:
patent: 3221211 (1965-11-01), Murphy et al.
patent: 3626239 (1971-12-01), Brock
patent: 4071805 (1978-01-01), Brock
patent: 4115723 (1978-09-01), Byrne et al.
patent: 4122371 (1978-10-01), Talmage et al.
patent: 4123668 (1978-10-01), Pecota
"Delay Circuits Keep Headlights On when Needed, Turn Them Off if You Forget," by J. Okolowicz, Patent Associated Literature, E 140-7620-11, vol. 24, No. 18, p. 114, Sep. 1, 1976.

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