Electrical heating device, especially for mirrors

• US 4,631,391 A
• Filed: 06/21/1984
• Issued: 12/23/1986
• Est. Priority Date: 03/31/1983
• Status: Expired due to Fees

• Current Assignee: Stettner & Company
• Original Assignee: Stettner & Company
• Inventors: Tiepke, Gunter
• Primary Examiner(s): Bartis, A.
• Application Number:
  US06/622,948
• Time in Patent Office: 915 Days
• Field of Search: 219/219, 219/203, 219/504, 219/505, 219/530, 219/540, 219/544, 219/222, 219/241, 219/541, 219/537, 338/22 R, 338/328
• US Class Current: 219/541
• CPC Class Codes: B60R 1/0602 comprising means for cleaning or deicing
• CPC Class Codes: H05B 3/14 the material being non-metallic
• CPC Class Codes: H05B 3/845 specially adapted for reflecting surfaces, e.g. bathroom - or rearview mirrors

Abstract

An electrical heating device for a mirror includes a pair of electrically conductive heating lining plates providing for heat distribution on a mirror, and electrical conductors connected to the plates for connecting the plates to a source of power. An insulating layer is disposed between the plates, the insulating layer having openings, and PTC resistor platelettes disposed in the openings and in electrical contact with the pair of plates. One of the plates has a larger area than the insulating layer such that an outer peripheral edge portion of the one plate is spaced outwardly of the outer peripheral edge of the insulating layer, the other of the pair of plates not being larger in area than the insulating layer. The larger of the plates is adapted to be adhered to the backside of a mirror glass for defogging and demisting the mirror.

Claims

1. An electrical heating device for a mirror comprising a pair of electrically conductive heating lining plates providing for heat distribution on a mirror, electrical conductors connected to said plates for connecting said plates to a source of power, an insulating layer disposed between said plates, said electrical insulating layer having openings, and PTC resistor platelettes disposed in said openings and in electrical contact with said pair of plates, one of said plates having a larger area than said insulation layer such that the entire outer peripheral edge portion of said one plate is spaced outwardly of the outer peripheral edge of said insulating layer the other of said pair of plates not being larger in area than said insulating layer.

2. An electrical heating device according to claim 1, wherein each of said pair of plates is made of a single piece of material.

3. An electrical heating device according to claim 1, wherein one of said plates is provided with embossments for receiving said PTC resistor platelettes.

4. An electrical heating device for a mirror comprising a pair of electrically conductive heating lining plates providing for heat distribution on a mirror, electrical conductors connected to said plates for connecting said plates to a source of power, an insulating layer disposed between said plates, said electrical insulating layer having openings, and PTC resistor platelettes disposed in said openings and in electrical contact with said pair of plates, said insulating layer having a larger area than one of said plates such that the entire outer peripheral edge portion of said one plate is spaced inwardly of the outer edge of said insulation layer, said other plate having a larger area than said insulating layer such than the entire outer peripheral edge portion of said other plate is spaced outwardly of the outer edge of said insulating layer such that the outer peripheral edge portions of said one plate, said insulating layer and said other plate are progressively staggered.

5. An electrical heating device for a mirror comprising, a pair of electrically conductive heating lining plates providing for heat distribution, one of said plates being adapted to be adhered to the back side of a mirror, electrical conductors connected to said plates for connecting said plates to a source of power, an insulating layer disposed between said plates, said insulating layer having openings, and PTC resistor platelettes disposed in said openings and in electrical contact with said pair of plates, said one plate having a larger area than said insulating layer such that the entire outer peripheral edge portion of said one plate is spaced outwardly of the outer peripheral edge of said insulating layer, the other of said pair of plates not being larger in area than said insulating layer.