×

APPARATUS FOR CONTROLLING THE INTENSITY OF VEHICLE HEADLAMPS

  • US 3,828,220 A
  • Filed: 11/20/1972
  • Issued: 08/06/1974
  • Est. Priority Date: 11/06/1969
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for controlling vehicle lamps in dependence upon the intensity of electrical street lighting supplied from an alternating current source, comprising conversion means including light-sensitive means, the conversion means being adapted to provide an output signal dependent on the amplitude of intensity variations at twice the frequency of the alternating current source in light incident on the vehicle from sources remote from the vehicle but independent of any substantially constant intensity component in said incident light, and control means for controlling a vehicle lamp in dependence upon a characteristic of the said output signal of the conversion means.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×