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Lighting systems for vehicles

  • US 4,045,769 A
  • Filed: 03/30/1976
  • Issued: 08/30/1977
  • Est. Priority Date: 04/03/1975
  • Status: Expired due to Term
First Claim
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1. A light dependent device for use in a motor vehicle having regulation lights, a lighting circuit and an ignition switch, said device being operative to monitor the environmental light and the condition of the ignition switch and provide warning when the regulation lights on the vehicle should be switched on or off, said device comprising a light sensor and a switching element including a warning device, the light sensor being connected to the switching element which is adapted to be connected to the lighting circuit and ignition switch of the vehicle and, in use, to switch when the intensity of the light falling on the light sensor passes a level at which the regulation lights on the vehicle should be switched on, the warning device being arranged to be activated by the switching element (1) when the light intensity falls below said level with the ignition switch on and the regulation lights off, and (2) when the ignition switch is turned off with the regulation lights on;

  • and to be deactivated by the switching element (1) when the light intensity exceeds said level with the ignition switch on and regulation lights off, (2) when the regulation lights are switched on with the ignition switch on and light intensity below said level, and (3) when the regulation lights are switched off with the ignition switch off.

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