Abstract: A combination lamp comprises a miniature arc tube, a standby filament and a thermal switch in a sealed vitreous envelope. The switch is connected in series with the filament, and the arc tube and the filament have separate inleads for external connections. The switch is closed at room temperature, allowing the filament to light up immediately at a cold start and providing an instant-on feature. During normal operation, heat and light radiated by the arc tube cause the switch to open and turn off the filament. The small size of the arc tube favors a heat balance which allows the thermal switch to cool and reclose quickly in the event of a current interruption, thereby assuring lighting after an acceptably brief delay in the event of a hot restart.
Abstract: Highly purified metal halide salts are made into a frangible stick having uniformly spaced lines of weakness which permit the stick to be broken readily into cylindrical pellets of uniform size. The pellets are particularly useful to supply the vaporizable fill in high intensity metal halide discharge lamps. The stick is formed by intermittently loading salt powder into the sized entrance to a channel through which the salt is forced, and compressing the charge against the back end of previously formed salt stick by means of a polished plunger.
Abstract: Increased optical transmission is provided for a body of light transmissive polycrystalline alumina having relatively uniform size equiaxed grains of alumina and which is essentially free of porosity and secondary phase material. A tube of the improved optical material can be used as the light transmissive envelope for high intensity discharge lamps especially sodium and other metal vapor lamps exhibiting increased light output as a result of said improved optical transmission. A method of producing the improved optical material is also disclosed.
Abstract: A photoflash lamp array comprising a plastic housing containing flash lamps having lead-in wires connected to a circuit board carrying switching circuitry for sequentially firing the flash lamps. A combined shield and flash indicator sheet is positioned between the circuit board and the rear of the housing and is contoured to have side portions extending along the side walls of the housing.
Abstract: A photoflash lamp array of the FlipFlash type having connector tabs each having three terminals for connection to three contacts of a camera socket, two of the socket contacts being electrically connected together. The two terminals of the array intended for connection to the two socket contacts which are electrically connected together, are electrically connected together in the flash array.
Abstract: Latch for luminaire clamp band comprises hinged link member connected to a latch lever, and a channel-shaped spring catch attached to the link member for holding the link member in engagement with the latch hook.
Abstract: High pressure discharge lamps containing a fill of mercury and metal halides, having a power input of 250 watts or below and useable for general illuminating purposes achieve higher efficacy by developing high end temperatures without excessively obstructing the transmission of light and without creating excessive thermal losses through radiation and conduction. To reduce the obstruction of light, heat-conserving coatings on the lamp ends are preferably omitted and small neck seals are used which serve also to reduce thermal losses. The lamps are constructed with an aspect ratio of arc chamber length to diameter from 0.9 to 2.5 and with an electrode insertion factor from 0.1 to 0.6 and operate with a wall loading from 10 to 35 watts/cm.sup.2 and with an arc loading from 60 to 150 watts/cm.
Abstract: A method and apparatus is described for melting of a glass batch with electrical energy supplied by electrodes disposed in a vertically oriented melting chamber and which ameliorates the problems encountered when the raw batch blanket cannot be continuously and uniformly melted in said chamber. Specifically, improved electrode heating means are provided to generate localized hot spots in the molten glass adjacent the underside of the batch blanket and cause a flow of gas bubbles upwardly through the glass at the hot spot locations for escape through the batch blanket. The electrical energy rate supplied to said electrode means is also controlled so that a crust of only partially melted foam-type glass material is not formed within the batch blanket to impede escape of the gas bubbles. The improved system can further include cooperative means to refine the molten glass being continuously withdrawn from the bottom of the melting chamber in a separate refining chamber connected thereto.
Type:
Grant
Filed:
May 1, 1978
Date of Patent:
July 17, 1979
Assignee:
General Electric Company
Inventors:
Kenneth S. Hrycik, John H. Leonhardt, William J. Prentice, Jr.
Abstract: A glass support bead through which lead-in wires extend within a miniature type of flash lamp is shaped to have a raised narrow ridge extending between the lead-in wires so that when the lamp flashes the lead-in wires will melt back at the sides of the raised ridge of the support bead. The support bead is formed by shaping jaws which squeeze against the heat-softened bead material to form the raised narrow ridge.
Type:
Grant
Filed:
November 28, 1977
Date of Patent:
May 22, 1979
Assignee:
General Electric Company
Inventors:
Victor A. Levand, Jr., Robert M. Anderson
Abstract: A reflector lamp is disclosed in which the lamp includes an integral reflector with the filament of the lamp in a predetermined relation with the focus of the reflector.
Abstract: An instant light lamp combining a miniature arc tube and a standby filament in a sealed vitreous envelope is operated by a high frequency power supply combined with a filament control circuit. The power supply comprises transforming means including voltage sensing means having an output proportional to the drop across the arc tube. The control circuit comprises an electronic switch for energizing the filament and a comparator circuit which has an output gating on the switch when the sensing means output is either above a high limit or below a low limit.
Abstract: Increased optical transmission is provided for a body of light transmissive polycrystalline alumina having relatively uniform size equiaxed grains of alumina and which is essentially free of porosity and secondary phase material. A tube of the improved optical material can be used as the light transmissive envelope for high intensity discharge lamps especially sodium and other metal vapor lamps exhibiting increased light output as a result of said improved optical transmission. A method of producing the improved optical material is also disclosed.
Abstract: A power control system to distribute the electrical energy being supplied to a glass melting furnace of the vertically oriented type wherein raw glass batch is fed at the top level of the melting chamber and molten glass withdrawn at the bottom level of said chamber. Specifically, the present control system supplies electrical power to three sets of electrodes located at different elevation levels in the melting chamber so that when power is increased to the intermediate level electrodes, there is a decrease in power applied to the top level electrodes while a constant power ratio is maintained between the intermediate and bottom level electrodes. Said control system can further include cooperative electrode heating means to refine the molten glass being continuously withdrawn from the bottom of the melting chamber in a separate refining chamber connected thereto.
Abstract: A marking ink for glass and ceramic substrates is disclosed which can be deposited from a liquid dispersion and heat-cured rapidly to provide an insoluble adherent film. The adhesive binder for the marking ink is an inorganic cement produced by heat-reaction between phosphoric acid and an aluminum salt of a weak organic acid to form an insoluble vitreous matrix in the final product. Various liquid dispersions for said marking ink are disclosed which are particularly suitable for application as indicia means upon the glass envelope of an electric lamp and can be applied during conventional lamp manufacture.
Abstract: A pinch and base structure is described in which the shaped end of a single-ended miniature lamp is securely engaged by a two piece, clip type base.
Abstract: Reflecting coating means are provided to replace the conventional reflector cavities surrounding each photoflash lamp of a multilamp photoflash array. A reflective adhesive coating for this purpose can be applied to each photoflash lamp around a portion of the lamp circumference to reflect the light outwardly in a desired direction. A reflective adhesive coating can also be applied to the circuit board member used with a photoflash lamp array to provide sequential firing of flash lamps as an alternate means to provide the desired light reflection and without need for individual lamp processing in achieving this result. The coating material comprises light reflective particulate solids bonded to the substrate with an adhesive binder.
Type:
Grant
Filed:
August 18, 1977
Date of Patent:
March 27, 1979
Assignee:
General Electric Company
Inventors:
Edward J. Collins, Vaughn C. Sterling, Harihar D. Chevali
Abstract: A voltage sensitive switch is provided characterized by an irreversible change in resistance from a high resistance state greater than one megohm to a low resistance state less than one thousand ohms and comprising a mixture of substantially pure grade copper powder with copper oxide powder which further contains a binder. Said switch interconnects a pair of spaced electrodes for use in sequentially firing a plurality of flash lamps.
Type:
Grant
Filed:
May 27, 1977
Date of Patent:
March 13, 1979
Assignee:
General Electric Company
Inventors:
Roland T. Girard, George A. Rice, Arthur N. DeTommasi
Abstract: A glass halogen, miniature incandescent lamp comprises at least two conductive pins for electrical contact and a molded seal area for secure mechanical contact in a socket.
Abstract: A short-arc discharge lamp having a pair of electrodes sealed through stems into a bulb, and an external starting device comprising an electrical conductor extending from the vicinity of the stem of one of the electrodes to the vicinity of the stem of the other electrode.