Circuit arrangement for indicator lights in motor vehicles

Details Circuit arrangement for indicator lights in motor vehicles Circuit arrangement for indicator lights in motor vehicles

1988-11-01

1990-06-12

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Special application

Vehicle

315178, 315201, 315294, 315312, B60Q 300

Patent

active

049336037

ABSTRACT:
A circuit arrangement for indicator lights in motor vehicles comprises four differently dimmable groups of lights I for tachometer and speedometer illumination 1, 2, II for the remaining dashboard illumination 3, 4, III for the center panel and foot space illumination 5, 6, and IV for the illuminating lights 7, 8 in a radio unit. These lights can be connected to a voltage source via a potentiometer 9 and an electronic amplifier 12. The amplifier has a number of different characteristic curves, corresponding to the number of groups of lights. The shape of these curves is such that, when the potentiometer 9 is turned from its null position into its end position, at first only the voltage for the first group of lights I, that is for the speedometer and tachometer illumination 1 and 2, is increased from zero to a average value. The remaining groups are switched on sequentially. In this way, the brightness of the separate groups of lights can be adjusted individually, with priority for the brightness of the tachometer and speedometer illumination.

REFERENCES:
patent: 3371241 (1968-02-01), Amacher
patent: 3704379 (1972-11-01), Slehofer
patent: 4029991 (1977-06-01), Schultz
patent: 4358713 (1982-11-01), Senoo et al.

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