Abstract: An oxygen detector for use in a double envelope lamp is described. The detector may be formed by nitriding a metal surface to produce a metal piece with a first visual color or state. The surface thickness is sufficient to exclude oxygen during normal assemble, but thin enough to change colors during lamp operation if oxygen is present.

Abstract: A lamp base having a floating rivet pin is described. Due to mechanical stress, sealed beam reflector leads may need mechanical strengthening; however, heat stress may be transmitted through the strengthening means. A rivet pin may be coupled in the lamp base having one face abutting the base, a shaft portion closely, but slideably positioned in a passage and a second face offset from the base. During thermal expansion of the lead, the second pin face may approach abutment with the base without stressing the seal structures. The floating rivet pin, secured by being snugly fit radially in the base passage to hold the floating pin, then resists the twisting that may occur during mounting.

Abstract: A lamp with re-enforced tubular base pins is disclosed. A less expensive, high quality, high wattage lamp may be formed with re-enforced tubular base pins. The lamp comprises a lamp envelope having an enclosed means for producing light, a light transmissive envelope, and at least two electrical connections, a ceramic lamp base for holding the lamp envelope, and the two tubular pins. Each pin comprises an electrically conductive tube having an exterior surface along which a compressive coupling may be made, and an interior surface defining an internal volume. A fill cement is positioned in the internal volume of each base pin at least along the portions opposite where compressive coupling may be made to the exterior surface of the pin.

Abstract: A lamp including a fill gas with a mercury component may be safely dosed with mercury by including at least one mercury capsule in the envelope for subsequent opening by radiant means to dose the closed envelope with mercury. A spring coil or similar means may be used for supporting the capsule in a tubular envelope at a position independent of and separated from the press-seal area. The support means generally comprises a compression positioning member, preferably in the form of a coil spring, having the capsule or capsules secured thereto and further having an uncompressed state prior to insertion in the envelope and a compressed state upon insertion in the envelope for retention of the compression positioning member and as a result, the mercury capsule, in a substantially fixed position in the envelope. Once the capsule is in position, the lamp may be safely closed, and the capsule opened by inductive, or other radiant heating.

Abstract: A ceramic base for a tungsten halogen lamp has a bottom wall for supporting contact pins connected to respective lead-in wires sealed in the press-sealed end of the lamp. The base furthermore has a side wall integral with the bottom wall and at least one hole therein for receiving the press-sealed end of the envelope. The ceramic base side wall has convective vent passages including at least a first vent passage for inlet of cool air to the air space about the press-sealed end of the lamp, and at least a second vent passage for outlet of warmed air therefrom to thereby provide convective air cooling of the envelope press-sealed end.

Abstract: An electric incandescent lamp (e.g., tungsten-halogen) including a light-transmitting envelope having an internal curvilinear wall, a gas mixture within the envelope, at least two support rods extending within the envelope in a spaced-apart manner, at least one bridge member within the envelope and supported substantially between the two support rods, and an electrically conductive filament structure located within the envelope and suspended from the bridge member. At least one support member, secured to the bridge member and projecting therefrom and including a U-shaped end portion for engaging the curvilinear internal wall of the envelope, is utilized to provide both compressive and axial support for the bridge member and suspended filament structure. The support member is preferably a wireform comprised of molybdenum.

Abstract: A single-ended tungsten halogen lamp having a tubular hardglass evenelope containing an inert gas and a halogen, preferably bromine. An improved halogen regenerative cycle in this type of lamp is achieved by minimizing the bromine and impurity attack on the tungsten filament, thus increasing lamp life over a wider application temperature range, through the use of a tantalum or zirconium getter which is in the form of a coil. This coil is particularly useful in small volume lamps, and in a preferred embodiment, is attached to the filament mounting structure (bridge) on the side thereof opposite the main filament body.