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Automatic antiglare mirror

  • US 5,675,438 A
  • Filed: 10/03/1995
  • Issued: 10/07/1997
  • Est. Priority Date: 11/10/1994
  • Status: Expired due to Term
First Claim
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1. An automatic antiglare mirror including an electrochromic element wherein its reflectivity is variably controlled by driving the electrochromic element by a pulse voltage and changing a duty factor of the pulse voltage in response at least to quantity of rear light so that, when quantity of rear light is smaller, the amount of coloration of the electrochromic element is smaller whereas, when quantity of rear light is larger, the amount of coloration of the electrochromic element is larger, said automatic antiglare mirror comprising reflectivity change ratio changing means for changing the ratio of change in the reflectivity to the duty factor of the pulse voltage so that, when a duty factor in a color imparting direction is smaller, the ratio of change in the reflectivity to the duty factor is smaller;

  • when the duty factor in a color fading direction is larger, the ratio of change in reflectivity to the duty factor is smaller;

    when the duty factor in the color imparting direction is larger, the ratio of change in the reflectivity to the duty factor is larger; and

    when the duty factor in the color fading direction is smaller, the ratio of change in the reflectivity to the duty factor is larger.

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