Projector-type head lamp assembly for vehicles

Claim 1

A projector-type head lamp assembly for use with vehicles, comprising a reflector having an inner reflection surface disposed about an optical axis, a lamp bulb having at least one axial coil filament disposed on the axis of the reflector, a convex lens disposed in front of the reflector, and a shade disposed between the reflector and convex lens and which has provided near the focus of the convex lens an optically effective edge which provides a light-dark boundary by blocking a part of the light rays projected from the lamp bulb and reflected by the inner reflection surface, wherein (a) said coil axis is arranged parallelly to said optical axis of said reflector and said reflection surface is composed of a plurality of reflection surface areas of different reflection properties; (b) said reflection surface area includes a first reflection area extended horizontally from the optical axis including the apex of said inner reflection surface, a second reflection surface area having at least two surface areas adjoining said first surface area at the top and bottom, respectively, of said first surface area and which are extended horizontally, and a third reflection surface area having at least two reflection areas adjoining said second reflection surface areas, respectively; (c) said first to the third surface areas are formed from numerous fine surface elements contiguous smoothly to each other, said fine surface elements belonging to each of said surface areas being so oriented in different orientations, respectively, as predetermined that the incident light rays from said lamp bulb are converged to different points in the vicinity of the edge of said shade; and (d) the orientations of said fine surface elements belonging to said first surface area are so determined that the incident light rays from said lamp bulb are converged near the center of the top end of the edge of said shade, the orientations of said fine surface elements belonging to said second surface areas being so determined that the incident light rays from said lamp bulb are converged to a horizontal zone including up to a position spaced horizontally a predetermined distance from the center of the top end of the edge of said shade, and the orientations of said fine surface elements belonging to said third surface areas being so determined, correspondingly to the orientations of said fine surface elements belonging to said first reflection surface area, that the incident light rays from said lamp bulb are converged into a vertical zone including up to a position extended downward from near the center of the top end of the edge of said shade.