Control system for automatic rearview mirrors

  • US 5,204,778 A
  • Filed: 04/06/1992
  • Issued: 04/20/1993
  • Est. Priority Date: 04/06/1992
  • Status: Expired due to Term
  • ×
    • Pin Icon | RPX Insight
    • Pin
First Claim
Patent Images

1. An electronic control system for controlling a reflective state of an automatic rearview mirror for an automotive vehicle, said system including a rearview mirror comprising an electrochromic variable reflectance mirror element the reflectivity of which varies over a reflectance range as a function of electrical signal levels applied thereto, first sensing means effective to sense the ambient light level and produce a first electrical signal which is at least in part logarithmically related to the sensed ambient light level, second sensing means effective to sense glare causing light level and produce a second electrical signal which is at least in part logarithmically related to the sensed glare causing light level, means to combine signals derived from said first and second electrical signals to produce at least a third electrical signal which is at least in part indicative of the severity of the glare, and means responding at least in part to said third electrical signal to control the reflective state of said mirror element.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×