Abstract: A double-enveloped electric lamp having a self-mounting frame-assembly for supporting a light-source capsule within the outer envelope, such frame-assembly being mounted by means of elastic and frictional forces other than glass-to-glass or glass-to-metal seals. In one embodiment of the invention, the frame-assembly is mounted on the neck of the outer envelope by means of a clamp on each leg of the frame-assembly; each clamp grasps the brim of the neck within a formed groove. Locking means may be obtained by mounting the lamp base over the grooves; barbed prongs on each clamp bite into the shell of the base and lock together the component parts of the lamp. In a second embodiment, a wire frame-assembly having two preformed legs with barbed prongs is mounted on the neck of the outer envelope by fitting each preformed leg into a matching groove formed in the threaded neck of the outer envelope.

Abstract: A single-ended low wattage high intensity discharge lamp and manufacturing process wherein a sleeve of electrical insulating material having the same coefficient of expansion as quartz is telescoped over an electrical lead a fuzed to the "pinch" seal portion of a quartz envelope.

Abstract: A double-enveloped tungsten halogen incandescent lamp having a light-source capsule containment device wherein a knitted wire mesh surrounds the light-source capsule and may be anchored to the capsule, stem, or lead-in wires. In the event of a burst of the light-source capsule, the containment mesh substantially restricts shards of the capsule from shattering the outer envelope of the lamp. In some embodiments, a crumpled portion of the containment mesh is positioned above the capsule and provides a collision-absorbing cushion in the event the capsule and mesh are propelled against the outer envelope by the burst of the light-source capsule whereby further protection against the shattering of the outer envelope is provided. Lamps with such containment devices have improved operational safety characteristics.

Abstract: A low wattage tungsten-halogen lamp with an improved filament construction comprising a pair of selectively activated filaments, each having a plurality of coil turns, being intercoupled by a relatively short intermediate member. Preferably, both of the filaments and the intermediate member are formed from a single wire. The spacing between turns of each filament is greater about the central portion of the filament than at the opposed end portions thereof, thereby enhancing visible radiation. Xenon gas, at a pressure of fifteen atmospheres, is preferably used as the inert gas fill for the lamp due to its low thermal conductivity.

Abstract: An electric lamp having a relatively high outer-envelope to inner-envelope wall-thickness ratio whereby the risk of a containment failure of the lamp is substantially eliminated. In an alternate embodiment, the outer envelope has a concave top. In another embodiment, the neck of the outer envelope has a relatively thick wall. Lamps having a wall-thickness ratio falling within the prescribed range, i.e., approximately equal to or greater than 3, have the property that the outer envelope will contain shards of the inner light-source capsule in the unlikely event such inner capsule should burst.

Abstract: This invention provides a one-piece frame for electric lamps. The frame has a one-piece body formed by bending operations on a pre-cut or pre-stamped blank sheet of stiff electrically conductive material. In an alternate embodiment of the invention, the frame has a one-piece body formed by bending operations on a single strand of stiff electrically conductive wire. Lamps employing the invention will be easier and cheaper to construct, and they will be of comparable or improved quality compared with their counterparts under the prior art.

Abstract: A tungsten-halogen lamp for use in an automobile headlight comprises a tubular sealed glass capsule containing two coiled tungsten filaments for high and low beam operation, respectively. The low beam filament is disposed substantially orthogonal to a vertical plane containing the lamp axis, with the center of that filament length having a predetermined offset from that vertical plane and being disposed at or near the focal point of the reflector. The high beam filament is disposed substantially parallel to the lamp axis on the opposite side of the vertical plane from at least a major portion of the low beam filament. The filaments are spaced apart with the high beam filament lying in a horizontal plane spaced below the low beam filament, and the axis of the high beam filament orthogonally intersects a plane containing in the axis of the low beam filament.

Abstract: Tungsten halogen incandescent lamps comprise tungsten filaments having different tungsten evaporation rates during normal operation. The filaments are supported on lead-in wires made of an alloy including tantalum.

Abstract: An electric lamp comprises a reflector envelope having a sealed tungsten-halogen lamp disposed therein. The lead-in conductor supports for the lamp extend through, and are connected to, metal eyelets which extend through holes in the reflector and are fastened to the reflector.

Abstract: A motor vehicle headlight comprises a curved reflector having a lens bonded to the front thereof. A tungsten-halogen capsule is disposed within the reflector. A filling hole extends through the rear of the reflector, the hole being hermetically sealed by means of a nonrigid sealing material.