Abstract: A reflector lamp comprising a concave reflector having a parabolic rear section, a spherical intermediate section, and a parabolic front section, each of the reflector sections having substantially the same common focal point, and a finite light source at the substantially common focal point, the reflector sections being dimensioned so that substantially all light rays from the finite light source which are reflected by the spherical intermediate section become re-reflected by the parabolic front section.

Abstract: A circular gas discharge reflector lamp has a ballast supporting structure enclosing a ballast and having a male screw shell extending therefrom. Lamp engaging arms extend from the structure and hold a circular gas discharge lamp which is electrically connected to the ballast and screw shell in an operative circuit. A concave reflector partially enclosing the lamp and attached to the ballast supporting structure near the male screw shell. A lens attached at its perimeter to the perimeter of the reflector, which transmits the direct light emitted by the lamp and also transmits the reflected light from the reflector. The screw shell, ballast supporting structure, reflector and lens are joined together with continuously sealed seams whereby the reflector lamp is water tight.

Abstract: A strobe lighting unit--and a reflector assembly forming part thereof--include a concave reflector having a predetermined shape, typically including a parabolic cross-section. The reflector is formed in situ as part of an assembly process by pressing a thin precut planar blank of reflective material, preferably an aluminum alloy foil having selected mechanical properties, into a die cavity in the reflector housing with a conforming die plunger to bend the blank into the predetermined shape. During the bending process residual tension forces are induced intentionally into the blank and these forces urge the foil into contact with surfaces defining the die cavity to supportively maintain the reflector in the predetermined shape.

Abstract: A table, wall, ceiling or desk lamp is provided with a translucent plastic shade having a top reflector at its upper end and bonded at its lower end to the outer periphery of a prismatic diffuser whereby the shade, top reflector and diffuser may be removed as a unit.

Abstract: A cover assembly comprising a cover having a plurality of holes for securement on top of a light base, said cover having a central top portion formed with at least one window for the exit light beam and an upwardly inclined ramp in front of said at least one aperture, and an optical system comprising a light source and at least one lens means hermetically mounted in said at least one window for the exit light beam, said lens means having a central refracting portion and two lateral total reflecting portions. The central refracting portion is formed with a first surface with double curvature towards the light source with flat upper and lower faces and a second surface with double curvature on its outer side with flat upper and lower faces.

Abstract: A signal lamp having a light source, a reflector, and a dispersion sheet wherein the dispersion sheet is divided into a plurality of dispersion elements constructed so as to minimize the adverse effect of incident stray light and minimize or eliminate the occurrence of phantom light effect.

Abstract: A long, linear indirect lighting fixture of a relatively small cross-sectional dimension which is mounted above eye level is comprised of lamps secured within an elongated housing, and a reflector and side lenses which direct and refract the greatest portion of luminous flux from the lamps above the horizontal plane of the fixture, yet a small portion of the luminous flux below but near the horizontal plane. The portion of light directed below but near the horizontal plane, which is controlled by, among other things, the relative placement of the lens and lamps, is great enough for an individual to have a perception of seeing a light source but small enough to avoid discomfort produced by glare.

Abstract: A signal lamp is disclosed for use in automotive vehicles. The lamp includes a housing, a reflector for producing parallel rays, a lens closing the housing in the direction of light exit and diaphragms mounted behind the lens. The outside of the lens is provided with non-reflecting or weakly reflecting transverse stripes to avoid undesired reflections. In one advantageous embodiment, the diaphragms are positioned only in an upper portion of the lamp.

Abstract: Luminaire apparatus, including a luminaire having a paraboloidal reflecting surface and a source of radiant energy such as a light source located at the focal point of the reflecting surface, is combined with means for selectively refracting light emitted by the light source and carrying out an improved method of producing a flood configuration of reflected light.

Abstract: A lamp for motor-vehicles wherein the base area of the prismatic cap is encompassed by a transparent plate in direct optical contact with the base area and adapted to direct into its interior the light emerging from the base area in a substantially radial direction and to direct it forwardly thereby forming a luminous halo surrounding the cap.

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.

Abstract: A light source consisting of a straight tube fluorescent lamp is mounted almost in parallel with a desk work surface to be illuminated. A housing enclosing this light source is mounted, and this housing is fixed on the surface to be illuminated by means of two support members. The housing has an opening section at its lower position, and a light controller which is formed of two kinds of prism plates is fitted in the opening. The light emitted from the light source is refracted by the prism plates. These beams of light are converted by the above light controller to two types of light components which run almost in parallel with the first and second directions. One of the beams of light falls from the right top in front of the person at desk to the illuminated surface region in proximity to the left hand of the person at desk, and the other beams of light fall from the left top in front of the person at desk to the illuminated surface region in proximity to the right hand of the person at desk.

Abstract: Optical elements for vessel navigation lights, providing improved and inexpensive means for achieving uniform, luminous intensity over a sharply bounded horizontal arc of visibility, and also for achieving a desired vertical arc of visibility, comprise means for projecting light from a diffuse source or an array or mosaic of point sources into a field the horizontal and vertical arcs of which can be precisely defined. The disclosure encompasses two geometric configurations for projecting light, symmetrical and asymmetrical, compound parabolic concentrators, each of which may be constructed as either a reflective cavity or a refractive dielectric, thereby to provide four basic designs for achieving uniform illumination over various horizontal arcs of visibility. In addition, the disclosure encompasses three modes of diffuse light projection to achieve uniform illumination over various vertical arcs of visibility.

Abstract: A vehicle headlamp is constructed with its reflector and front lens adapted to be fixedly mounted in the bodywork of the vehicle, but incorporates a beam deflecting system, in order that the direction of the beam may nonetheless be adjusted. In one form, the beam deflecting system comprises two Fresnel lenses, mounted face to face in a position to intercept the whole of the headlamp beam, one being equivalent to a diverging lens with cylindrical surfaces, and one being equivalent to a converging lens with cylindrical surfaces. In a neutral position, the effects of the two lenses cancel out, so that no deflection of the beam occurs. One of the lenses is movable in translation away from the neutral position, so that a deflection of the beam occurs, without any other change in the beam pattern. In modified embodiments, the stationary Fresnel lens is not used; instead, its effect is produced by using a reflector of modified shape.

Abstract: A cover for lights, especially automobile lights, wherein at least a part of the cover which is located within a flat area of a reflector opening of the light when the cover is installed is provided with a number of individual sections. The sections are staggered in a stepwise fashion within a plane which is horizontal in the installed position and/or in a vertical plane with the sections extending in a direction opposite to an intended direction of travel of the atuomobile.

Abstract: A vehicle headlamp has a reflector provided with a reflective area lying on a surface defined by rotating an ellipse about an axis which passes through the inner focus of the ellipse and which is inclined an acute angle (1.degree.-2.degree.) to the focal axis of the ellipse. A shielded filament for producing an inclined cut-off line to the beam is used and is orientated in the opposite sense to that in which it is orientated in a conventional headlamp for producing an inclined cut-off. To produce a Z-beam pattern, lensing at the front of the reflector splits the area of the basic beam pattern immediately below a horizontal portion of the cut-off line into parts which define upper and lower, mutually laterally displaced horizontal cut-off portions in the required Z-beam pattern.

Abstract: A single pair of headlamps that each contain a single on-focus light source and produce different but complementary beam patterns are mounted on a motor vehicle to provide a composite beam of intense non-glare light that is used for city, rural and turnpike driving and thus remains "fixed" and constant for all driving conditions. The use of a single light source in each headlamp improves the optical efficiency of the lighting system and provides both long range and short range illumination of the roadway with a minimum amount of energy and drain on the electrical system of the vehicle. The headlamps are not interchangeable and must be mounted in proper relationship on the vehicle to provide the single-mode illumination.

Abstract: A light fixture unit is provided for use at a work station of an open plan office design. The light fixture unit combines in a single framework a downwardly facing light chamber for directing light onto a task work surface and an upwardly facing light chamber for directing light over a wide area for reflection off the ceiling of the office area to provide ambient indirect light.

Abstract: This portable lighting apparatus which comprises a case having a parabolic reflector, a bulb whose filament is situated substantially at the focus of the parabolic reflector and a square or rectangular shaped diffusing lens fixed at the periphery of the reflector, perpendicularly to the optical axis thereof, is characterized in that the lens carries a series of rectilinear and adjacent scores on each of its internal and external faces, in that the scores of the same series are formed by concave cylindrical surfaces having transversely the same radius and are perpendicular to those of the other series and in that the radii of the scores of the internal face of the lens are slightly smaller than those of the scores of the external face of said lens, the depth and the radii of the two series of scores being chosen so that the pyramidal light beam therefrom gives constant illumination in any plane perpendicular to the optical axis.

Abstract: This invention relates to lighting systems for use during surgical operations or examinations.The device comprises a bundle of optical fibres having an intake area into which the light from an ellipsoidal mirror having a lamp therein can be beamed. A concave lens area located in an area facing away from the optical fibre bundle is co-axially situated forwardly adjacent the light intake area of the fibre bundle.The concave area may be formed by grinding out portion of a transparent plate and the light from the mirror may be concentrated by an aspheric lens between the mirror lamp and the lens area.

Abstract: Indoor lighting fixture provides semi-indirect symmetrical light distribution. The fixture comprises a central support tube attached to the ceiling at its upper end and having a high intensity gaseous discharge lamp at its lower end projecting into a box-like housing having a semi-transparent variable transmission lens on its bottom and an interior reflector extending around the lamp for reflecting light rays upwardly toward the ceiling. Vertically spaced louvers arranged encircling the upper portion of the lamp serve to shield the lamp from direct view of the room occupants to avoid glare.

Abstract: The reflector has a transparent body in the form of a paraboloid with a light source located within the reflector along the axis of symmetry. The inner surface of the reflector has a plurality of circular ridges of generally triangular cross-section, each ridge being defined by a cylindrical surface portion the axis of which is coincident with the axis of symmetry and by a frusto-conical surface portion adjacent to said cylindrical portion which lies on a cone having its axis coincident with said axis of symmetry with each of the cones having a common apex located approximately at the center of said light source.

Abstract: The separate reflector and light bulb components presently used in flashing-light signal apparatus employed at railway crossings are replaced by a sealed-beam type incandescent reflector lamp having a window-aperture in the concave reflector portion of the lamp envelope which is adapted to be aligned with a side opening in the lamp-housing of the signaling apparatus and thus permits the operation of the light source inside the sealed-beam lamp to be checked visually by the engineer of an approaching train. Additional cost and functional advantages are obtained by also making the separate red-colored lens component of the signal apparatus an integral part of the sealed-beam warning lamp and by using a long-life halogen-cycle type lamp component as the light source within the sealed-beam reflector envelope.

Abstract: A vehicle headlamp for producing a Z-beam pattern has a reflector provided with a reflective area lying on a surface defined by rotating an ellipse about an axis which passes through the inner focus of the ellipse and which is inclined an acute angle (1.degree.-2.degree.) to the focal axis of the ellipse. A shielded filament for producing an inclined cut-off line to the beam is used and is orientated in the opposite sense to that in which it is orientated in a conventional headlamp for producing an inclined cut-off. Lensing at the front of the reflector splits the area of the basic beam pattern immediately below a horizontal portion of the cut-off line into parts which define upper and lower, mutually laterally displaced horizontal cut-off portions in the required Z-beam pattern.

Abstract: The present invention relates to an automobile headlight comprising a parabolic reflector, a front glass and a twin-filament lamp for far-beam and dipped-beam located on the optical axis of the reflector on either side of the focus thereof, said headlight being characterized in that a screen located in the front and in the upper part of the lamp defines on the reflector a zone which is struck only by the rays issuing from the far-beam filament. The corresponding zone of the front glass is also determined solely as a function of the far-beam filament.

Abstract: The present invention relates to an indicator light, particularly for an automobile, comprising a catadioptric element such that its position in the light and the preferred orientation of certain of its catadioptric prisms allow a zone adjacent the zone normally imposed by the geometry of the light to be illuminated. The invention is more particularly applied to the corner lights of automobiles.

Abstract: A source of radiant energy is combined with spaced apart reflecting surfaces which are sections of paraboloids of revolution and which have a common focal point but differing focal lengths. Radiant energy is reflected in substantially parallel rays and passed through radiation transmitting means which include radiation controls zones. The reflecting surfaces and the radiation transmitting means are mounted for rotary displacement of one relative to the other to vary the distribution pattern, intensity, color, and other characteristics of the reflected radiant energy in a unique manner. Radiation output from the source of radiant energy may be instantly tailored to a task at hand such as may arise, for example in theatrical lighting, mine lighting, police and surveillance work, military operations, fire fighting, sports activity, illumination of recreational areas and the like.

Abstract: A device for producing an optical guide signal is disclosed. This device is particularly suitable for installation in airport runways and comprises a covered housing containing a light source and a prism wherein a portion of the prism projects above the cover of the housing such that light emitted from the source is both transmitted through the prism and is also internally reflected within the prism before emerging at one of the surfaces of the said projecting portion of the prism.

Abstract: The invention relates to a shadowless lighting appliance more particularly pplicable for illuminating areas exposed for surgery in operating theatres. A lighting appliance according to this invention is characterized by the fact that it includes at least the following combination of means: - a light source; - a reflecting surface of revolution and - a glass formed of dioptric radial elements, the function of each element being to provide, by refraction to either side of a radial plane, the spreading of a beam of light reflected by a portion of said reflecting surface proximate a generatrix thereof, such that the elemental patch of light obtained on a plane be a luminous quadrilateral. In one form of embodiment, the above combination of means further includes a sleeve consisting of an optical system surrounding the light source.

Abstract: A limited visibility signal device is disclosed which includes a housing, a source of illumination within the housing, a light directing lens at the outer end of the housing, and a light collimating arrangement between the source of illumination and light directing lens to intensify and directionally control light delivered to the light directing lens. The light directing lens includes an inner side provided with parallel lenticular elements extending thereacross and having first outer surface portions parallel to the lens axis and second outer surface portions of circular contour. The light directing lens further includes an outer side provided with parallel adjacent lenticular elements extending thereacross perpendicular to the elements on the inner side of the lens and alternate ones of which are of convex and concave contour with respect to the lens axis.

Abstract: A method of altering the photometric output and distribution of a light beam produced by a lamp having a fluted sealed beam lamp lens cover, the light beam having a certain beam shape which, in the absence of the present invention, does not conform to the photometric specifications for auxiliary low beam automobile head lamps; the latter specifications require the lamps to have specific maximum and minimum candela(s) output at various photometric points within the beam pattern.Specific areas of certain flutes molded into the lens cover of a non-conforming sealed beam lamp are partially or totally covered with an opaque material or obstructed by a shield to restrict the candela output of unwanted light at various photometric points within the beam pattern, and thus permit the total beam pattern of the treated lamp to meet state and Federal photometric specifications for auxiliary low beam automobile headlamps.