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Control device for antiglare mirror

  • US 5,469,296 A
  • Filed: 03/28/1994
  • Issued: 11/21/1995
  • Est. Priority Date: 03/29/1993
  • Status: Expired due to Term
First Claim
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1. A control device for controlling the reflectivity of mirrors in a vehicle comprising:

  • an inner mirror having a gel-type electrochromic (EC) cell responsive to a voltage signal greater than a reference voltage to decrease the reflectivity of the inner mirror;

    an outer mirror having a thin-film type EC cell responsive to a negative voltage signal for increasing the reflectivity of the outer mirror and responsive to a positive voltage signal for decreasing the reflectivity of the outer mirror;

    a detector responsive to light intensity at the inner mirror for generating a first voltage signal having a value corresponding to the light intensity;

    a driving circuit responsive to the value of the first voltage signal for generating a positive driving voltage having a value above a reference voltage at times when the intensity is above a certain level; and

    a control circuit responsive to the positive driving voltage for varying the reflectivity of the outer mirror in accordance with the detected light intensity of the inner mirror.

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