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Anti-glare rearview mirror system

  • US 5,581,406 A
  • Filed: 03/09/1994
  • Issued: 12/03/1996
  • Est. Priority Date: 03/09/1993
  • Status: Expired due to Term
First Claim
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1. An anti-glare mirror system for an automobile having an interior and an exterior, the system comprising:

  • an interior rearview mirror adapted to be arranged in the interior of the automobile;

    an exterior rearview mirror adapted to be arranged in the exterior of the automobile, said interior rearview mirror and said exterior rearview mirror having different reflectivities of light;

    an electro-optical device applied to said interior rearview mirror and having means for varying said reflectivity of said interior rearview mirror;

    an electro-optical device applied to said exterior rearview mirror and having means for varying said reflectivity of said exterior rearview mirror;

    electrical drive circuit means connected to said electro-optical devices to control said reflectivities of said exterior rearview mirror and said interior rearview mirror so that said reflectivities are adjustable to different reflectivity values;

    sensing circuit means for detecting ambient and backward light and for comparing levels of said ambient and backward light with standard values to determine whether said levels of said ambient and said backward light warrant a change in said reflectivities of said interior and exterior rearview mirrors;

    coloring/bleaching switching gate circuit means for determining if a time period during which said levels of said ambient and said backward light are at values which warrant a change in said reflectivities exceeds a predetermined time interval thus indicating that said values are not transient, said coloring/bleaching switching gate circuit means being connected with said electric drive circuit means and said sensing circuit means; and

    transforming circuit means for applying one drive voltage to said interior rearview mirror and another drive voltage to said exterior rearview mirror so that said one drive voltage applied to said interior rearview mirror is greater than said other drive voltage applied to said exterior rearview mirror so that said reflectivity of said interior rearview mirror is less than said reflectivity of said exterior rearview mirror.

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