Automatic rearview mirror system for automotive vehicles

  • US 4,917,477 A
  • Filed: 04/06/1987
  • Issued: 04/17/1990
  • Est. Priority Date: 04/06/1987
  • Status: Expired due to Term
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First Claim
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1. In an automatic rearview mirror system for automotive vehicles, the combination including an electrochromic variable reflectance member the reflectivity of which varies continuously over a range as a function of at least two electrical signal levels applied thereto, ambient light sensing means effective to sense ambient light and generate a corresponding electrical signal indicative of the ambient light level, glare sensing means effective to sense glare causing light and generate a corresponding electrical signal indicative of the glare causing light level, and means operable to apply an electrical control signal to said variable reflectance member to vary the reflectivity of said reflectance member while maintaining a high quality image during reflectance transition as a function of the sensed ambient light signal and the sensed glare causing light level signal, the total response time of said control signal to changes in the electrical indicative of the glare causing light level being faster than the total response time of said electrochromic reflectance member to said control signal.

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