The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 1990
Filed:
Nov. 01, 1988
Axel Bier, Gundelsheim, DE;
Audi AG, Neckarsulm, DE;
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.