Patent ID: 6414796
Filing Date: 2002-07-02
Classification: B32B,G02B,Y10T

Abstract:
A head-up display device comprising information projection means emitting information in form of light rays, and a windshield glass having a reflecting surface for reflecting the light rays toward an observer inside a vehicle, whereina first light path is defined between a first reflecting surface prepared on an internal surface of the windshield glass and the observer by a first light ray that is emitted from the information projection means, reflected by the first reflecting surface, and projected toward the observer, a second light path is defined between the internal surface and the observer by a second light ray that is emitted from the information projection means, refracted into the windshield glass at the internal surface, reflected by a second reflecting, surface prepared on an external surface of the windshield glass, and refracted out of the windshield glass at the internal surface toward the observer, the first reflecting surface and the second reflecting surface are non-parallel to each other so that the first light path and the second light path are approximating each other more than when the first reflecting surface and the second reflecting surface are arranged in parallel to each other, at least one surface selected from the first reflecting surface and the second reflecting surface is a ground reflecting surface formed by grinding the surface of the windshield glass so as to set the non-parallelity of the reflecting surfaces, the surface of the windshield glass includes a ground surface contacting the ground reflecting surface with an angle between 170Â° and 190Â°, and a shading band is formed at least in a part of the periphery of the windshield glass, and the ground surface has, in a region where the shading band is formed, an edge that is opposite to the edge contacting the reflecting surface.