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Rearview mirror with heater for defrosting and defogging

  • US 5,440,425 A
  • Filed: 06/29/1993
  • Issued: 08/08/1995
  • Est. Priority Date: 06/29/1993
  • Status: Expired due to Term
First Claim
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1. Rearview mirror for a motor vehicle, said rearview mirror consisting of a base (3);

  • a mirror plate (1);

    supporting means (2) for holding said mirror plate (1), said supporting means (2) being rigidly attached to said base (3) and holding said mirror plate (1); and

    defogging and defrosting means for defogging and defrosting said mirror plate (1), said defogging and defrosting means consisting of a self-controlled heater located between said mirror plate (1) and said supporting means (2), wherein said self-controlled heater comprises a polymeric semiconductor substrate (5) including a porous conductive lampblack and an electrical conductor track (6) printed on said semiconductor substrate (5), said electrical conductor track (6) being made from a silver ink;

    wherein said polymeric semiconductor substrate consists essentially of about 60% by weight of low density polyethylene, of about 8.5% by weight ethylene vinyl acetate copolymer, of about 4.0% by weight of a spreading agent consisting of calcium stearate, of about 3.0% by weight of an antioxidant of about 0.5% by weight of a coupling agent consisting of calcium titanate and of about 20% by weight of said porous conductive lampblack.

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