Abstract: A composite fused quartz material is disclosed for processing semiconductor grade silicon material in an improved manner. The modified vitreous material includes a disperse phase of fine size silicon metal particles which are distributed in preselected regions of the fused quartz matrix as a means of exercising temperature control in the various semiconductor processing operations using these fused quartz parts. Such utilization of the modified vitreous material in single crystal silicon rod growth and production of semiconductor grade silicon by diffusion doping is described. A method to produce the modified vitreous material is also disclosed.

Abstract: In an arc tube for a high intensity metal halide discharge lamp, a particular composition of metal halide dose is provided to control thorium transport to the electrodes within the arc tube and tungsten transport to the wall to improve arc tube performance.

Abstract: A molded glass reflector member for a lamp unit employing a tungsten halogen lamp as the light source is disclosed wherein the engagement means for mounting said lamp unit replaceably in a socket member includes a particular configuration of the hollow cavity portion of the said reflector member to enable improved lamp focus and physical retention of said lamp unit in its socket. Specifically, said hollow cavity end protruding from the rear side of said reflector member includes both a recessed engagement surface for mounting said lamp in the socket member so as to position the illumination emerging from said reflector member more accurately along with additional molded depressions located on opposing exterior surfaces of said elongated cavity which cooperates with said recessed engagement surface to still more accurately position the lamp in said socket member.

Abstract: Coil bobbins are disclosed having flanged coil support portions provided with outboard terminal housings projecting beyond the flange rim and defining inwardly extending terminal-receiving cavities. The end walls of the housings are slotted to allow a wire to pass through the cavity in a circumferential direction relative to the winding axis in similar fashion to a turn of coiling. Bifurcated terminals pressed into the cavities in straddling relationship to the wire provide connections to the coil.A double bobbin has twin flanged coil support portions with bridging sections maintaining their physical separation. Terminal housings are provided on the bridging sections allowing wire to be first wound into a coil on one support portion, guided across the bridging section and passed through the cavity in a terminal housing, and then wound into a coil on the other support portion, all without interruption.

Abstract: Incandescent lamps having an improved light source are disclosed. The light source contains a halogen compound along with a fill-gas at a pressure above atmospheric. The light source has an oblate ellipsoidal shape so as to obtain a desired temperature gradient which reduces typically experienced "cold spots" that detrimentally contribute to the condensation of halogen compounds within the light source which would otherwise reduce the desired light output of the light source throughout life. Also disclosed is a method of manufacturing the light source.

Abstract: A series ballast circuit for operating a gas discharge tube from a constant current alternating voltage source having a fundamental frequency is disclosed. The primary feature of the ballast circuit comprises a ballast transformer having a magnetic core and at least a primary coil and at least a secondary coil. The ballast transformer has parameters that are selected in accordance with the operational conditions, that is, the extinguished and non-extinguished states of the gas discharge lamp. The primary coil and the area of the core have parameters selected in accordance with the extinguished state of the gas discharge tube. The primary and secondary coils have a selected turn ratio so as to produce a current level sufficient to maintain the ionization condition of the gas discharge tube in its non-extinguished state.

Abstract: An improved vehicle headlamp for developing forward illumination and having reduced dimensions relative to prior art headlamps is disclosed. The lamp comprises an enclosed concave parabolic reflector of a rectangular cross section type and having a single tungsten-halogen light source coaxially located within the enclosed reflector. The headlamp has a glare shield arranged around the light source when the headlamp is utilized for low beam application and a heat shield located about the light source for both low and high beam applications. The light source is of a tubular shape and has a bulbous portion preferably of an ellipsoidal shape. The efficacy of the light source is improved by means of an infrared reflective coating placed on its outer surface.

Abstract: A fluorescent lamp utilizing a dual layer phosphor coating is disclosed wherein the base layer utilizes a first phosphor mixture and the top phosphor layer in said coating comprises a blend of narrow bandwith emitting phosphors to improve the color rendering capability of these lamps.

Abstract: A power supply for a metal halide discharge lamp includes a circuit for applying a high voltage starting pulse to the arc tube of the lamp to initiate the discharge, a glow transition current to provide power transitioning the arc tube from its glow to its run mode, and a run power supply circuit to provide continuous controlled d-c current to the arc tube.

Abstract: A method and apparatus for precision winding of coils on bobbins. Ideal positions for all portions of wire on the bobbin are predetermined on the basis of a planned winding profile taking into account number of turns, wire size and bobbin dimensions. Then incremental control of traverse, simultaneously with spin of a fly head winder, relative to the bobbin is utilized to put the wire down on the bobbin at the ideal positions independently of the lay of prelaid turns. The control is preferably done through a computer whose memory contains essential data on the winding profile. The computer is programmed to read feedback signals on instantaneous traverse and spin and provide control signals to cause the winder to duplicate the coil winding profile.

Abstract: A transport tray for ribbon formed glass articles such as lamp glass envelopes and glass containers is disclosed which permits increased packing density to be achieved when the article containing trays are vertically stacked for shipment. The tray member comprises a flat sheet having cavities formed therein which partially enclose one side of the individual glass articles when inserted therein and with the location of said cavities being defined by at least one central row having the glass articles aligned alternately in opposite longitudinal directions, together with a row of said glass articles being located at each end of said central row wherein the individual glass articles are aligned in a longitudinal direction transverse to the longitudinal direction of the glass articles in said central row. These trays are thereafter stacked vertically whereby adjoining trays are rotated approximately 180.degree. with respect to each other for the increased packing density.

Abstract: A mounting arrangement for disposing a light source comprising an inner envelope within an outer envelope with both envelopes comprising a general service tungsten-halogen incandescent lamp is disclosed. The mounting arrangement has parameters which are selected in accordance with the ratio between the natural frequency characteristics of the filament of the light source and the mounting arrangement itself. The selected ratios of the natural frequencies of the filament and the mounting arrangement reduce the typically experienced shock vibrations of the general service lamp that are transmitted to the filament and thereby improves the overall life expectancy of the general service incandescent lamp.