Automatic headlight dimmer apparatus

  • US 5,086,253 A
  • Filed: 10/15/1990
  • Issued: 02/04/1992
  • Est. Priority Date: 10/15/1990
  • Status: Expired due to Fees
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First Claim
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1. An automatic headlight dimmer switch comprising, in combination,a light directional tube mounted to a vehicle, the directional tube including a beveled left side to permit light into the directional tube from an oncoming vehicle, and the directional tube including a photo-sensitive transistor mounted within the tube, the photo-sensitive transistor arranged in a first circuit loop parallel to a second circuit loop, the second circuit loop including a first adjustable potentiometer resistor in series with a relay coil, anda first junction transistor coupled between the first circuit loop and the second circuit loop, anda high beam voltage input line coupled to at least one high beam lamp mounted within the vehicle, and operative to direct voltage to the high beam lamp upon absence of light directed into the light directional tube upon actuation of the relay coil, anda third circuit loop arranged parallel to the first and second circuit loop, with the third circuit loop including a second junction transistor at a junction between the first, second, and third circuit loops, and a second resistor in series with the first adjustable resistor, and a third resistor in parallel with the relay coil, and a capacitor in series with the third resistor to effect a time delay in actuation of the relay coil to permit complete passage of the oncoming vehicle.

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