General Electric Company

James T Dakin

Mark E Duffy

Raymond A Heindl

Kenneth A Darrow

Tommie Berry, Jr

Gary Robert Allen

Victor D Roberts

Thomas G Parham

Peter D Johnson

Timothy D Russell

Kenneth S King

John M Davenport

Richard L Hansler

Curtis E Scott

William J Cassarly

George A Farrall

John M Anderson

Frederic F Ahlgren

Harald L Witting

Rolf S Bergman

Raghu Ramaiah

John P Cocoma

Lawrence W Speaker

Matthew Bugenske

Myron C Muth

Richard C Nagle

James R Woodward

James A Leonard

Stuart A Mucklejohn

Lawrence T Mazza

Victor A Levand, Jr

Sayed Amr El-Hamamsy

Gergely Janos Ormandlaky

Robert K Alff

Walter R Champman, Jr

Bernard F Fenoglio

A ceramic body ( ) for a discharge vessel ( ) includes a central barrel portion ( ) and two end plus ( ), which close opposite ends of the barrel. Main electrode ( ) and an initiator electrode are supplied with power via conductors in leg members ( ). In one embodiment, a first electrode and the initiator electrode are supplied with current through two separate leg members. In another embodiment, a dual electrode leg member is provided with two bores ( ).

Three electrode ceramic metal halide lamp

A lamp assembly ( ) includes a body ( ) having a concave reflecting surface ( ) that opens toward a first or open end ( ) and a neck ( ) at a second end includes an opening ( ). A light source ( ) is received in the body adjacent the reflecting surface and has a seal or pinch region ( ) which extends into the neck. A mounting clip ( ) includes a plate ( ) that engages the outer surface of the neck. First and second legs ( ) of the mounting clip engage the pinch region via teeth ( ), while arms ( ) engage an internal surface ( ) of the neck.

One piece clip for mounting light source to reflector

An electric lamp ( ) including a sealed light-transmissive lamp envelope ( ) having an interior space, a base fixed to the outer envelope ( ), a non-insulated main conductor wire ( ) within the outer envelope and connected to the base ( ) at one end, a light source ( ) capable of generating light within the outer envelope ( ), a shroud ( ) surrounding the light source ( ) and mounted adjacent the non-insulated main conductor wire ( ), and a first center support. The light source ( ) has first and second ends. The first end is electrically coupled to the non-insulated main conductor wire ( ), and the second end is coupled to a stem lead ( ). The first center support ( ) supports the shroud ( ) and the light source ( ) and mechanically couples the shroud ( ) and the light source ( ) to the non-insulated main conductor wire ( ).

Shrouded electric lamp having functionally distinguishable center supports

A metal halide lamp comprised of a ceramic discharge chamber containing an ionizable fill, said fill comprising Hg, and halides (H) of Na, TI, an alkaline earth metal, and 0>rare earth element (Re)<15 as a molar fraction.

Ceramic metal halide lamp

An apparatus for improving the performance of a ceramic metal halide (CMH) lamp includes an interior chamber ( ) disposed within an outer envelope ( ). In a preferred arrangement, two legs ( ) extend laterally in opposite directions from the chamber. Each leg encloses an electrode/leadwire assembly ( ). The electrode/leadwire assembly is constructed from a single continuous piece of wire, preferably tungsten, which forms a shaft or mandrel ( ). One end of the mandrel supports an electrode tip ( ) which is also preferably made from tungsten. The mandrel also supports an overwind component ( ) at a predetermined position. In a desired arrangement, the overwind component is made from molybdenum. The single or one-piece mandrel negates the need for a welded shank assembly resulting in a stronger and more stable lamp that is less expensive to manufacture.

Elimination of weld in ceramic metal halide electrode-leadwire

A lamp-to-light guide coupling arrangement includes an electrodeless high intensity discharge lamp comprising an arc tube with an ionizable fill, and an excitation circuit for electrically exciting the ionizable fill to induce therein a light-producing arc discharge. The coupling arrangement further includes a coupling device comprising a generally tubular, hollow body that has an inlet end for receiving light from the arc discharge and a larger, outlet end. The coupling device further comprises an interiorly directed reflector on a surface of the hollow body for reflecting visible light. Such coupling device is shaped so as to receive light at one solid angle over an area of the inlet end and to transmit light at a smaller solid angle but over a larger area of the outlet end. The coupling device is preferably formed from dielectric material. The reflector preferably comprises a refractory optical interference filter.

Lamp-to-light guide coupling arrangement for an electrodeless high

An electric lamp includes a sealed outer envelope, an arctube located within the envelope, a shroud separate from the arctube having an ellipsoidally-shaped reflecting portion positioned around the arctube, and a coating disposed on the reflecting section of the shroud for reflecting light having predetermined wavelengths emitted by the arctube. The ellipsoidal shape of the shroud is effective for reflecting the light substantially back toward the arctube. Particularly when the coating is a color correcting coating, the shape of the reflecting section is tailored to maximize reflection of radiation at selected wavelengths back toward the arc of the arctube.

Electric lamp with ellipsoidal shroud

A high intensity metal halide arc discharge lamp, such as an electrodeless lamp wherein RF energy is inductively coupled to the arc discharge, contains a halide of neodymium alone or in combination with other metals such as one or more rare earth metals, Na, Cs and is essentially mercury free (i.e., &lt;1 mg per cc of arc chamber volume).

Low mercury arc discharge lamp containing neodymium

An electrodeless discharge lamp comprising an arc tube constructed of a light-transmissive material. An exciting structure surrounds the arc tube and is energizable with radio frequency current to develop an arc discharge. A reflective coating of non-conducting insulating material is disposed on the arc tube wall and is located to reflect light from the arc discharge through the arc tube. The reflective coating and the uncoated portion of the arc tube wall are surrounded by the exciting structure so that light from the arc discharge may reach the reflective coating without blockage by the exciting structure and, following reflection by the coating, travel through the uncoated portion of the arc tube wall.

Luminaire including an electrodeless discharge lamp as a light source

An electrodeless high intensity discharge (HID) lamp arc tube having a stabilized condensate location. The arc tube contains a predetermined location or distortion on the inside surface of the arc tube. The distortion may be a protrusion on the inside surface of the arc tube formed during the arc tube forming process. In operation of the lamp, the non gaseous dose remains condensed substantially in the cold spot region formed by said protrusion so that the arc tube walls remain clear for maximal light output, and the arc tube remains stable and efficacious to substantially higher power than is the case for arc tubes without the distortion.

Electrodeless arc tube with stabilized condensate location

A high intensity electrodeless metal halide arc discharge lamp wherein RF energy is coupled to the arc discharge, contains a halide of praseodymium alone or in combination with other metals such as one or more rare earth metals, Na and Cs and is essentially mercury free (i.e., &lt; 1 mg per cc of arc chamber volume).

Low mercury arc discharge lamp containing praseodymium

An arc stabilization arrangement for a discharge lamp having a light transmissive arc tube containing a fill of gas excitable to a discharge state upon introduction thereto of a drive signal having a predetermined frequency associated therewith, includes a modulating arrangement effective for providing a modulating signal which is imposed onto the drive signal. The modulating signal has a frequency associated therewith which approximates the acoustic resonance of the gases within the fill, such modulating signal frequency being less than the frequency of the drive signal. In one embodiment of the invention the modulating arrangement is an amplitude modulating scheme effective such that a modulating amplitude of greater than about 5% of the amplitude of the drive signal is achieved. In yet a further implementation of the present invention, the frequency of the modulating signal is swept about a range of frequencies so that a varying acoustic resonance frequency can be encompassed by the modulating signal.

Acoustic resonance arc stabilization arrangement in a discharge lamp

Asymmetric discharge electrode means are provided for a metal halide lamp enabling improved operation at acoustic frequencies. A xenon-metal halide lamp employing such improved discharge electrode means is disclosed together with a reflector lamp unit employing such lamp construction for its light source.

Metal halide lamp having improved operation acoustic frequencies

This electrodeless high intensity discharge lamp including a light-transmissive arc tube having spaced wall portions of dielectric material and a first gaseous fill within the arc tube. An excitation coil about the arc tube is energizable with RF current effective to develop a toroidal arc discharge in the first gaseous fill upon a dielectric breakdown of the fill. A starting container is joined to the arc tube and has an end wall constituted by one of said arc-tube wall portions. A second gaseous fill within the starting container has a dielectric strength lower than that of the first gaseous fill. For initiating the rotoidal arc discharge, we provide an arrangement for producing a dielectric breakdown of the gaseous fill within the starting container that develops into an electric discharge that changes the potential at the end wall in such a manner as to cause a dielectric breakdown of the first gaseous fill.

Starting aid for an electrodeless high intensity discharge lamp

A low-loss L-C circuit arrangement for an electrodeless high intensity discharge (HID) lamp includes an excitation coil having at least one coil turn which is disposed in surrounding relation to the arc tube portion of the HID lamp and is configured in a low profile manner so as to minimize light blockage caused thereby. The L-C circuit arrangement includes a capacitor member having first and second capacitor plates which are electrically and mechanically connected to the excitation coil. The connection between the excitation coil and the capacitor member is made by a pair of connection members integrally formed with the coil turn and capacitor plates from a stock sheet of electrically and thermally conductive material.

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Shaker Heights, OH, United States of America

James T Dakin