Grounding device for lamp with shielded electrodes
OwnerJohn N. Ottinventor
Life of this patent
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Abstract
A grounding device for a fluorescent lamp of the type having a tubular envelope with electrodes at the ends between which an electric discharge occurs. Radiation shields around the electrodes prevent emission of electrode radiation from the lamp and a grounding element connects the shields to the ground.
Claims6
In a fluorescent lamp fixture including a housing and fluorescent lamp of the type comprising a sealed, elongated tubular light-conducting envelope containing an arc-conducting gas, a light emitting phosphor coating on the inside of the envelope and electron-emitting electrodes at each end of the envelope electrically connected to conductors extending through the ends of the envelope, grounded shielding means for preventing emission outside the walls of the envelope of radiation generated in the electrode area of the lamp, said grounded shielding means comprising:
- a shielding member mounted on said lamp envelope outside the path of the arc discharge between the lamp electrodes and arranged to extend around the electrode area of the lamp envelope, said shielding member having sufficient thickness and axial length to absorb substantially all of the radiation emanating from the electrode area of the lamp around which it extends, and;
- a grounding member mounted on the housing of the lamp fixture at a position in contact with the shielding member.
Dependencies are inferred from the claim text.