Arrangement for heating the wiper rest area of a vehicle...

H - Electricity – 05 – B

Patent

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Details

H05B 3/86 (2006.01) B60J 1/02 (2006.01) B60S 1/02 (2006.01) B60S 1/04 (2006.01) H05B 3/84 (2006.01)

Patent

CA 2221044

The present invention provides a windshield with a heating arrangement to heat the wiper rest area of the windshield. The windshield includes first and second glass sheets secured together by an interlayer. A single, continuous resistance heating wire is secured between the glass sheets and makes multiple passes through a predetermined portion of the windshield generally corresponding to the wiper rest area such that the wire generates a desired power density within the predetermined portion to heat the wiper rest area. Opposing first and second ends of the wire extend to common connection area along an edge of the windshield and a connector secured to the wire ends provides for external electrical access to the wire. The wire may also extend along a marginal edge portion of the windshield generally corresponding to its A-post area. In one particular embodiment of the invention, an opaque ceramic band is bonded to a major surface of the second glass sheet, which forms the inner ply of the windshield, along its marginal edge portion such that the wire is not visible when the windshield is viewed through the second glass sheet. In addition, the wire may include a coating having a color that generally corresponds to the color of the opaque ceramic band to mask the appearance of the wire when the windshield is viewed through the first glass sheet.

Cette invention concerne un pare-brise à élément chauffant intégré à l'endroit où se trouve normalement la lame d'essuie-glace au repos. Le pare-brise comprend une première et une seconde feuilles de verre assemblées l'une à l'autre au moyen d'une couche de liaison intercouches. Un fil continu de chauffage par résistance, disposé entre les deux feuilles de verre selon un tracé en lacet dans la partie correspondant à l'endroit où se trouve normalement l'essuie-glace au repos, délivre la densité de puissance nécessaire pour chauffer la zone d'appui de la lame d'essuie-glace au repos. Aux deux extrémités du fil chauffant se trouve une zone de connexion commune longeant un bord du pare-brise. Un connecteur disposé dans cette zone sert à raccorder le fil chauffant à source d'alimentation électrique extérieure. Le fil chauffant peut également suivre un tracé rectiligne le long de la rive du pare-brise généralement contiguë au montant de pare-brise. Dans une variante de l'invention, une bande céramique opaque est collée à la surface de la seconde feuille de verre, celle qui constitue la couche intérieure du pare-brise. Cette bande longe la rive inférieure du pare-brise et masque le fil à la vue des personnes se trouvant dans l'habitacle. De plus, le fil chauffant peut être enrobé dans une matière ayant la même couleur que la bande céramique opaque afin qu'il ne puisse être vu de l'extérieur de l'habitacle.

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