Patent ID: 6522068
Filing Date: 2003-02-18
Classification: H01J

Abstract:
A fluorescent lamp (1) comprising a glass discharge vessel (2) in which a gas is present, which discharge vessel (2) is provided on either side with a tubular end portion (3) with a longitudinal axis, each end portion (3) being provided with a glass stem (5), while an exhaust tube (6) extends axially outward from the stem (5) for receiving and/or discharging gases during the manufacture of the lamp (1), and an electrode (8) extends through the stem (5) axially inward for maintaining a discharge in the discharge vessel (2), characterized in that the fluorescent lamp (1) complies with at least one of the following equations: Î¾=R1R2+1R3R4+1<0.4&it;â€ƒ&it;and/orÎ±=R1R2<0.25in whichR1/R2=a measure for the effectivity with which the thin glass surface of the stem (5) where the exhaust tube (6) is fused to the stem (5) is heated; R3/R4=a measure for the effectivity with which heat is transported from the stem (5) to the discharge vessel (2) by means of radiation.