Abstract: A hologram fitted to a rear window glass is irradiated with light from a regenerative light source to produce a holographic image to ensure the effective operation of a high mount stop lamp and to simultaneously prevent light from dazzling the driver of a following vehicle. The high mount stop lamp is provided with a hologram disposed on the inside surface of a rear automotive window glass, and a regenerative light source for regenerating the holographic image by irradiating the hologram. Part of the regenerative light source is buried in a recess in a rear parcel shelf of the automobile. A shielding wall is fitted to a part of the periphery of the regenerative light source so as, together with the rear window glass, to surround the regenerative light source to shield the light directed to the front of the automobile. The shielding wall is formed, for example, by folding up part of the decorative panel of the rear parcel shelf in the form of a wall.

Abstract: A lens for a vehicle lamp having a central bright portion and a surrounding portion of lesser brightness and which can be manufactured as a single unit. The lens surface is formed with arcuate step-like blocks circumferentially separated from one another and divided from one another by a plurality of concentric lines and radial lines. The blocks in a central portion of the lens have a refractive configuration, while the blocks disposed outside of the central portion have a linearly transmitting configuration. The two types of blocks are arranged continuously and unitarily in a concentric manner in a radial direction of the central portion.

Abstract: In connection with a Fresnel lens in which concentric pitch base lines are drawn on a curved lens member at certain pitches and a number of radial partitioning lines are drawn so as to pass through the center of the concentric pitch base lines and to cross these lines so that a surface of the lens member is partitioned into a large number of arcuate Fresnel step design sections, and an angled Fresnel step is formed in each of the Fresnel step design sections so that light transmitted from a focal point of the lens at its rear side forms a substantially parallel flux of light through a refractive or reflective prism, the invention relates to the cutting of Fresnel steps in a mold element for forming the lens by causing a tool attached to a multiple axis milling cutter and having an acute point to perform reciprocating or circumferential cutting for every width of each of the inclined surfaces of said Fresnel steps while causing the tool to move radially to perform scan-cutting of the inclined surfaces.

Abstract: A lens adapted for use in vehicular lighting employs a Fresnel configuration despite the fact that the lens has no axis of revolution and is formed as a quadric surface to meet vehicle design needs. The basic lens design is obtained by orthographically projecting a planar Fresnel pattern onto the quadric surface. The surfaces of the Fresnel steps are formed so that light emanating from a rear focus is converted into substantially parallel beams by reflection/reflection through the lens. The surfaces may have continuously or incrementally varying angulation, and may be formed by cutting using a 3 or 5 axis milling cutter.