Abstract: A device for fixing and adjusting an optical block (1) on a motor vehicle, said optical block being of the type including a plurality of peripheral positioning tabs (4a, 4b, 4c), said device comprising a one-piece support (6) suitably shaped to co-operate with the peripheral edge of said optical block, said support being provided firstly with a plurality of mounting members (15, 16, 17) enabling said support to be adjustably fixed to a vehicle, and secondly with a plurality of clamping members (7, 8, 9) suitable for co-operating with said positioning tabs (4a, 4b, 4c) on said optical block in order to position said support and to hold said support relative to said optical block, the relative positions of said mounting members and said clamping members ensuring that said optical block is correctly positioned on said vehicle.

Abstract: Method of production of a reflector wall having a core of thermosetting material enclosed in a skin of thermoplastic material, by two-material injection molding. Between a concave mold face having projecting points and a convex mold face, a thermoplastic skin material and a thermosetting core material having a polycondensation temperature greater than the plasto-elasticity temperature of the thermoplastic skin material are successively injected, while holding a temperature intermediate between the two temperatures; the points cause in the skin material interruptions permitting the emergence of the core material to the concave mold face, in localised zones of this in which open vents; the polycondensation of the core material and the hardening of the skin material is successively caused.

Abstract: The invention relates to a main beam unit for a motor vehicle, said unit comprising first and second juxtaposed parabolic main beam headlamps (10, 20). In accordance with the invention, these headlamps are of different aperture diameters and of different focal lengths, with the aperture diameter d.sub.1 of the first headlamp being greater than the aperture diameter d.sub.2 of the second headlamp, and with the focal length f.sub.1 of the first headlamp being greater than the focal length f.sub.2 of the second headlamp.

Abstract: The present invention relates to a protective cap for a motor vehicle headlamp and is intended to be mounted on the rear of a reflector (100) incorporated in the headlamp. The cap comprises an enveloping sleeve (20) which has inwardly projecting fastening means (21, 22) for co-operating with a rim (111) on the headlamp. The sleeve also has a flexible sealing lip (30) which rests, in use, against the reflector. According to the invention, the fastening means are arranged in a plurality of levels of generally annular structures projecting from the inside face of the sleeve and axially spaced along said inside face (23). In addition, the sealing lip is suitable for withstanding deformation including a radial component which is of the same order of magnitude as the axial separation between two adjacent levels of the projecting structures, while still providing proper sealing for the rear surface of the reflector (100).

Abstract: An adaptor in accordance with the invention serves to couple a cylindrical light guide (40) with a light source (10). The adaptor comprises an inlet surface (20) which is concave, which is spherical, which is centered on the center point (0) of said light source and which receives said light source in such a manner that all light rays from said source striking said inlet surface pass therethrough without being deflected and thus enter the guide; the adaptor further includes a light flux recovery surface (30) which is convex and symmetrical about the axis of the light guide, said recovery surface is such that the angle of incidence of a light ray emitted from the source and passing into the guide through the inlet surface is always greater than the limiting angle for total internal reflection corresponding to the refractive index of the material constituting the guide.

Abstract: The present invention relates to manufacturing and adjusting the orientation of a motor vehicle headlamp and to a motor vehicle headlamp for performing the method. In a headlamp (7) of the type comprising a transparent front glass (15) fixed to the bodywork (28, 29) of the vehicle and an optical assembly (35, 36) having an optical axis (38) passing through the glass (15), graduated adjustment means (90) are provided for adjusting the orientation of the optical assembly (35, 36) relative to the glass (15) in order to enable the orientation of the optical axis (38) to be adjusted using said means (90) relative to an error as measured between the orientation of the glass (15) as mounted and a predetermined orientation thereof. This makes it possible to use mechanical means for measuring such an error and to adjust the orientation of the optical axis as a result of such measurement providing the headlamp is of the above-described type.

Abstract: The corrector device comprises at least one illumination sensor (10, a, b, c) integrated in a headlamp and fixed to move with the headlamp reflector (12), the sensor-reflector assembly normally pointing in such a direction as to detect the luminance of the road in at least one angular direction at a predetermined angle (o+.phi.+.theta.) with the horizontal (OY), with processing means being provided that are suitable for generating a corrector signal which is a function of the luminance of the road in said direction, whenever the trim of the vehicle changes, the device further including at least one actuator controlled by said corrector signal in order correct the direction in which the reflector-sensor assembly is pointing.

Abstract: The invention relates to a headlamp reflector for an automobile vehicle manufactured by injection molding according to the coinjection process using poly(alkylene terephthalate) having a viscosity number (DIN 16,779) of between 60 and 180 cm.sup.3 /g. It is characterized by the fact that the core contains some 15 to 75% by weight of hematite, at least 75% of the hematite having a particle size less than 70 .mu.m. Good mechanical strength and good behavior in respect of temperature.

Abstract: The device is of the type comprising a lamp-supporting ring (10) having an opening for receiving the base of a lamp, and a clip (30) in the form of a loop of wire which is pivotally mounted to one side of the said opening to pivot between an open position in which the opening is clear and a closed position in which the clip locks a lamp in position. The device includes the improvement wherein a first end (32) of the said wire is pivotally mounted in at least one bearing (16) provided on the said one side of the ring, and wherein the opposite end of the clip (40) is so shaped as to present a cradle suitable for receiving a portion of the first end and for being itself received, when the clip is in the closed position, in a recess (42) provided in the ring. The device is particularly intended for use in car headlights.

Abstract: A headlamp for an automobile comprising a light source (F.sub.C) a reflector (F) co-operating with this light source in order to reflect in a direction of emission a beam of substantially parallel rays, and a front glass (G) for dispersion and diffusion interposed in the path of the light rays, this glass being inclined with respect to the direction of emission. The glass has on its internal face, correcting optical elements (10) the active surface (11) of each of which is defined by the intersection of a prism inclined by an angle .alpha. with respect to the vertical plane passing through the direction of emission and having an angle .beta. at the apex, and a cylindrical rib having an axis parallel to the prism and a radius r, in such a way that the inclination .alpha. of the prism compensates for the effect of vertical deflection caused by the inclination of the glass.

Abstract: The invention relates to an automobile headlamp having a light source co-operating with a principal reflector of generally parabolic form, and a glass which is greatly inclined with respect to the vertical. Selected critical zones of the reflector have an elliptical form with one focus in the proximity of the light source and the other focus in the proximity of the center of the glass, and the central zone of the glass is substantially smooth, in such a way that the light rays reflected by the critical zones of the reflector pass through the glass without significant deflection in spite of its inclination.

Abstract: A headlamp for an automobile, capable of emitting a beam of light with a cut-off comprising an elliptical reflector having two focii, a light source at the first focus of the reflector, and a convergent lens located opposite the reflector with respect to the second focus. The lens and the reflector have a common optical axis and the focus of the lens is at the second focus of the reflector. A screen is located at the common focus having an edge close to the optical axis in order to define the cut-off beam. Localized deflector elements are provided at the upper part and the lower part of the lens to produce a lateral dispersion and/or a lowering of the light passing through these parts of the lens in order to reduce the effects of the chromatic aberrations in the vicinity of the cut-off.

Abstract: A headlamp comprising a reflector of which at least one sector is in the form of a paraboloid of reduction, a bulb with an axial filament offset upwards in the radial direction with respect to the axis of the paraboloid, and a light-distributing glass placed in front of the reflector. The filament is centered in the axial direction on the focus of the paraboloid. The surfaces of the reflector situated outside the sector in the form of a paraboloid are designed so as to produce images of the filament which are all situated below the cut-off. Alternatively, the light-distributing glass participates in the deflection, in combination with the surfaces of the reflector. In an advantageous variant the reflector is completely parabolic and homologous deflecting zones are then provided on the light-distributing glass to lower all the images thus produced below the cut-off.

Abstract: A method and apparatus for the production of parts made from plastics material using an injection press in which the mould cavity is defined by a mould surface Sca and the surface Sve of a movable piston. Firstly, the material is introduced into the mould cavity and during injection, the piston is kept stationary for a time to form a rough mould and then retracted to form a parison. Secondly, after injection has been completed the piston is advanced again, and maintained in position while cooling takes place. Thirdly, the mould is opened and the part ejected.

Abstract: The present invention relates to auxiliary spotlights (headlamps) for automobile vehicles, for example fog and spot lamps. Such auxiliary spotlights generally comprise a sealed beam unit, i.e. a reflector-light source-glass assembly, housed in a casing forming a protective housing. A system of articulated assembly connects the casing to the automobile vehicle on which the spotlight is thus fixed by the outside.

Abstract: The process for producing a shaped article comprising a polythene terephthalate (PETP) core containing from 0 to 50% of mineral fillers and a covering layer of a second thermoplastics material having a softening point below that of the PETP. The second material and the PETP are injected one after the other into a mould which is maintained at a temperature below the crystallization point of the PETP having regard to its fillers. The second material injected in the first phase acts as a thermal buffer slowing down temperature equalization between the PETP injected in the second injection phase and the mould, thus ensuring the required properties in the PETP core.

Abstract: A motor vehicle headlamp comprising in combination an optical system for recovering flux having a rectilinear focal segment and an optical system for rectifying images having a focal segment coinciding with the former and able to produce a beam of rays of controlled directivity passing through a narrow light window, while preserving a high luminous efficiency. The flux recovery system is constituted by an elliptical paraboloid, an hyperbolic paraboloid or their optical equivalents. By using various combinations of optical elements, it is possible to arrange the flux recovery system both in the axis of the rays leaving the headlamp, as well as on the side of the body work or on the lower part of the latter.

Abstract: A light transmitting system for an automobile headlamp having a real light source, means for a light channel and an elliptical reflector for concentrating the radiation from this source on the end of the light channel provided with a plurality of reflecting facets. The light channel is formed by a single transparent bar arranged horizontally and transversely with reference to the direction of illumination. The front of the bar is formed as a vertical light output face and the rear of the bar has a series of vertical steps defining a series of oblique vertical reflecting facets thus constituting as many virtual light sources. These facets are arranged in optical co-operation with lenses having axes parallel to the direction of illumination so that these lenses project images corresponding to the facets in the direction of illumination in order to form an assembly of elementary light beams merging into one single beam.

Abstract: This invention relates to a headlamp inter alia for motor vehicles.The headlamp comprises a lens (1) formed by a number of juxtaposed dioptric elements (4) each having a focal point (F) and an axis (5); a light source (6-10) is provided for each element (4) vary near the focal point thereof; the axes (5) of the various dioptric elements (4) are so arranged that the elementary light beams issuing from the elements (4) when the corresponding sources (6-10) are illuminated form a single beam having a predetermined light distribution.Of use for the construction of very shallow headlamps suitable for integration in the bodywork.

Abstract: In a vehicle headlamp, a light deflecting system is provided which comprises two plate-like transparent deflecting elements. Each element has a series of parallel fibs, and the elements are movable one relative to the other at right angles to the length of the ribs. The profiles of the ribs are so chosen that, in a neutral position of the deflecting elements, each rib on one deflecting element faces a rib of complementary shape on the other deflecting element, so that the system imposes no net deflection on light rays passing through. To produce a deflection of these rays, the deflecting elements are shifted relative to the other, so that then, the deflection suffered by the light in passing through one deflecting element is not wholly cancelled by the deflection suffered in passing through the other deflecting element; by suitable choice of the profile of the ribs, the net deflection is the same for all the deflected rays.