×

Ambient light responsive illumination brightness control circuit

  • US 3,962,600 A
  • Filed: 02/14/1975
  • Issued: 06/08/1976
  • Est. Priority Date: 02/14/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. A controllable illuminating system comprising a power supply, a pair of terminals adapted to be coupled to said power supply, illuminating means coupled to one of said terminals, and control means coupled to said illuminating means and to the other of said pair of terminals, said control means having a diode coupled for inducing current flow of a first polarity from one of said terminals through said illuminating means and light sensitive circuit means coupled for controllably inducing current flow of opposite polarity from one of said terminals through said illuminating means in response to the ambient light level where said control means is located for varying the power supplied to said illuminating means thereby varying the intensity of illumination emitted from said illuminating means in response to said ambient light level.

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