Rearview mirror with heater for defrosting and defogging
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
The rearview mirror consists of a base attached to a motor vehicle; a supporting structure attached to the base, a mirror plate held in the supporting structure, and a self-controlled heater for defrosting and defogging located between the mirror plate and the supporting structure. The self-controlled heater includes a polymeric semiconductor substrate containing a conductive lampblack, a conductor track including a plurality of electrically conductive bands made with silver ink printed on the semiconductor substract and a terminal for each conductive band. The conductive track has interpenetrating portions spaced at intervals from each other and structured and dimension to provide sufficient heat transfer for defogging and defrosting the mirror plate.
27 Citations
5 Claims
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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. - View Dependent Claims (2, 3, 4)
- a mirror plate (1);
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5. 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 consists of an extruded polymeric semiconductor substrate (5) comprising a porous conductive lampblack, low density polyethylene and ethylene vinyl acetate copolymer;
an electrical conductor track (6) printed on said semiconductor substrate (5), said conductor track being made from a silver ink, and terminals (9) connected to the electrical conductor track (6).
- 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
Specification