Electric lamp and discharge devices: systems – Special application – Vehicle
Patent
1997-11-03
1999-12-07
Shingleton, Michael B
Electric lamp and discharge devices: systems
Special application
Vehicle
315 82, 315 108, 315307, 307 108, 362800, H05B 3702
Patent
active
059989289
ABSTRACT:
An illumination control system comprises a source of a lighting intensity control signal, the source having an intensity control signal output. The system also includes at least one first lighting element coupled for direct intensity control by the lighting intensity control signal. Further, the system comprises at least one second lighting element. Additionally, the system comprises a low-pass filter having a filter input and a filter output, the filter input coupled in electrical communication with the intensity control signal output. Also, the system includes a transistor responsively coupled to the filter output and intensity-controllingly coupled to the at least one second lighting element. In one embodiment of the present invention, the transistor has a control input terminal, a second terminal and a third terminal, the control input terminal responsively coupled to the filter output, the second terminal intensity-controllingly coupled to the at least one second lighting element and the third terminal coupled in electrical communication with the intensity control signal output. Systems according to the present invention can be used to effectively control the intensity of lighting elements of different technologies at lower cost than prior art systems.
REFERENCES:
patent: 3705316 (1972-12-01), Burrous et al.
patent: 4101808 (1978-07-01), Flint
patent: 4160934 (1979-07-01), Kirsch
patent: 4717868 (1988-01-01), Peterson
patent: 4870325 (1989-09-01), Kazar
patent: 4947291 (1990-08-01), McDermott
patent: 5012392 (1991-04-01), Hochstein
Ford Motor Company
Shingleton Michael B
Sparschu Mark S.
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