General Electric Company

Gerald E Duffy

John M Davenport

Gary Robert Allen

Sayed-Amr A El-Hamamsy

Mark E Duffy

Michael M Secen

Timothy P Dever

Martin N Hassink

Dale K Mikol

D Aaron Crites

John J Cowling

A metal halide arc discharge lamp includes a sealed outer envelope, an arc tube located within the envelope, a cylindrical shroud positioned around the arc tube, stops positioned at ends of the shroud to capture the shroud therebetween, conduction wires which both provide electrical energy to the arc tube and mechanically support the arc tube and the shroud, and a compression spring secured by an eyelet for removing tension loading from the arc tube.

Retaining spring and stop means for lamp mount

A lamp assembly having an improved mounting arrangement for a light source and shroud configuration provides for such improved mounting arrangement in a manner such that manufacturing of the lamp assembly is simplified and the light source is protected against vibration and shock forces during manufacture and operation. The light source includes an arc tube which is under pressure and which is disposed within a shroud member that is then mounted within an outer lamp envelope. Top and bottom support members made of an insulative material are disposed on opposite ends of the shroud member. One of the lead wires used to couple energy to the light source, extends through the shroud member and has an insulative sleeve disposed in surrounding relation to a portion thereof. As the one lead wire extends through a hole formed in the bottom support member, a resilient clip member is slid over the bottom portion of such lead wire. The resilient clip member contacts the bottom of such bottom support member and by virtue of a tapered neck portion, prevents movement of the support member and the shroud back down on the lead wire. The resilient clip member has a flat upper portion which is flexible so that vibration and shock forces that would otherwise be transmitted to the light source are transmitted instead through the lead wire that extends through the shroud member.

Lamp assembly with a resilient retaining lamp mount structure

A simulated load circuit for measuring the impedance of the arc discharge of an electrodeless discharge lamp of the type having an arc tube and an excitation coil for exciting the arc discharge in an ionizable fill contained therein includes: a secondary coil spaced apart from the excitation coil by a distance which is varied in order to vary the coupling coefficient between the secondary coil and the excitation coil; a fixed load resistance coupled to the secondary coil; and a variable matching network coupled in series or parallel with the load resistance, the impedance of the matching network being varied in order to vary the ratio of reactance to resistance of the load circuit. The distance between the secondary coil and the excitation coil is varied, and the impedance of the matching network is varied, until the input impedance of the load circuit is substantially equivalent to the operating impedance of the lamp. The simulated load circuit is useful for designing and testing ballast circuits for electrodeless discharge lamps and for providing measurements of arc discharge power and excitation coil efficiency.

Simulated load circuit for simulating the arc impedance of an

Method for measuring the impedance of an electrodeless arc discharge lamp

Heat sink means are provided for a metal halide lamp to enable more light output during lamp start-up. A xenon-metal halide lamp employing the heat sink means is disclosed along an with automotive headlamp having this lamp for its light source.

Heat sink means for metal halide lamp

Anode and cathode means are provided for a metal halide lamp which cooperate in providing more rapid light output during lamp start-up. A xenon-metal halide lamp employing the improved discharge electrode means is disclosed along with an automotive headlamp having this lamp for its light source.

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Mentor, OH, United States of America

Gerald E Duffy