Windscreen and device for driving assistance

US11014338B2 · kind B2 · utility

Assignee

• SAINT-GOBAIN GLASS FRANCE · FR

Inventors

• Benjamin Kaplan · Sandaucourt, FR
• Klaus Schmalbuch · Aachen, DE
• Stefan Droste · Herzogenrath, DE
• Christian EFFERTZ · Aachen, DE

Key dates

• Filing date: Oct 17, 2017
• Grant date: May 25, 2021
• Expiry date: Feb 19, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R2011/0026
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A laminated motor-vehicle windshield includes two glass sheets that are joined together by an interlayer made of a thermoplastic of refractive index n1. The thermoplastic interlayer includes a cut-out section in the upper portion of the windshield. The cut-out section is filled with a multilayer film forming a waveguide for guiding waves from a bottom point of entrance of light radiation on the face of the windshield exposed to the exterior of the vehicle to a top point of exit of the radiation on the face of the windshield arranged toward the passenger compartment of the vehicle. The multilayer film includes layers of a first material of refractive index n2 such that n1≥n2 and of a second material that at least partially reflects the light radiation. The second material is placed on either side of the layer of first material to confine, in the latter, the light radiation.